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CN1161428A - Micro-wave oven - Google Patents

Micro-wave oven Download PDF

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Publication number
CN1161428A
CN1161428A CN 97101071 CN97101071A CN1161428A CN 1161428 A CN1161428 A CN 1161428A CN 97101071 CN97101071 CN 97101071 CN 97101071 A CN97101071 A CN 97101071A CN 1161428 A CN1161428 A CN 1161428A
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CN
China
Prior art keywords
time
signal
heating
setting
voltage
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Pending
Application number
CN 97101071
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Chinese (zh)
Inventor
秋山俊郎
长谷川惠一
新井勉
金井孝博
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Application filed by Mitsubishi Electric Home Appliance Co Ltd, Mitsubishi Electric Corp filed Critical Mitsubishi Electric Home Appliance Co Ltd
Priority to CN 97101071 priority Critical patent/CN1161428A/en
Publication of CN1161428A publication Critical patent/CN1161428A/en
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Abstract

一种结构简单、能有效可靠地检测食品加热状况的装置，及有易于使用该装置的各种控制功能的微波炉。该微波炉备有收容被加热物的加热室；加热加热室内的被加热物的微波发生装置；向磁控管送冷却风的冷却风扇；将冷却风的一部分导向加热室内的吸气部；将加热室内的气体排到加热室外的排气部；与由加热室内的被加热物放出的气体接触设置的热敏电阻元件传感器；以及根据以热敏电阻元件传感器的电阻值为依据的信号交流分量，对微波发生装置进行供电·断电控制的控制装置。

Figure 97101071

A device with simple structure, which can effectively and reliably detect the heating state of food, and a microwave oven with various control functions which are easy to use the device. The microwave oven is equipped with a heating chamber for storing the object to be heated; a microwave generator for heating the object to be heated in the heating chamber; a cooling fan for sending cooling air to the magnetron; a part of the cooling air is directed to the suction part in the heating chamber; The gas in the room is exhausted to the exhaust part outside the heating room; the thermistor element sensor is set in contact with the gas released from the heated object in the heating room; and according to the signal AC component based on the resistance value of the thermistor element sensor, A control device that controls power supply and power failure of microwave generators.

Figure 97101071

Description

Micro-wave oven
The present invention relates to have the micro-wave oven of the thermistor element sensor of the state that detects and control the gas that from food, produces along with the heating of food.
Take the whole bag of tricks to detect the heated condition of food in the micro-wave oven so far, and controlled micro-wave oven.
Detect heated condition the most direct of food and accurately method be will measure the hygrosensor that temperature uses to insert food, directly measure the temperature of food.
; directly measure the method for temperature of food with hygrosensor; hygrosensor to be inserted food; this operation itself is pretty troublesome; because usually in order to make the homogeneous heating of food; micro-wave oven has the structure of the food bowl of making rotation, uses in this micro-wave oven and utilizes lead to be practically impossible with the hygrosensor that the micro-wave oven body is connected, and does not therefore also hear the practical example whether serviceability temperature detector in micro-wave oven is arranged.
Detect the method for the surface temperature of food as contact food not, for example special radiation thermometer that temperature is measured in the disclosed surface emissivity that utilizes food in the flat 7-91667 communique of opening is arranged.
There are various restrictions when measuring the surface temperature of food exactly, in the family expenses micro-wave oven, use radiation thermometer also can not expectation to measure accurately even believe with radiation thermometer.
One of restriction is that the radiant light that requirement is incided in the radiation thermometer should be all from food irradiation.This means fabricated food correctly,, food is put into container with cover and then made another matter in addition with the micro-wave oven heated food so that make the incident visual field of radiation thermometer all occupied by food.
The 2nd restriction is the problem of radiance.The radiance of catoptrical black matrix is not 1 fully, and the radiance of complete catoptrical reflector is 0.In addition, 1 value that deducts the radiance gained is called reflectivity.
The value sum that the radiant energy corresponding with the temperature of food multiply by the value of radiance gained and multiply by the reflectivity gained with the corresponding radiant energy of the temperature of (be actually around furnace wall) around the food incides on the radiation thermometer as whole radiant energy.Radiation thermometer is calculated the temperature of food according to whole radiant energy of incident, but known in this calculates, the temperature of the radiance of food and wall on every side must be known.
We can say that the radiance (and even reflectivity) of knowing the food in the micro-wave oven in advance and the distribution of wall surface temperature on every side and even temperature are practically impossible, therefore can not expect to measure food surface temperature in the micro-wave oven exactly with radiation thermometer.
Open temperature and the delivery temperature that also discloses in clear 52-11546 communique and the clear 60-218793 communique of Te Kai by the heating clamber of measuring micro-wave oven the spy, detect the heated condition of food and control the method for micro-wave oven.
In this method, temperature in the heating clamber and delivery temperature are not by the temperature monodrome decision of food, be subjected to a great extent absorbing microwave and heated chamber walls surface temperature and the influence that enters the gas temperature in the heating clamber if consider, then can not reach setting or temperature rising value by temperature in the heating clamber and delivery temperature reaches setting and judges whether the temperature of food has reached setting, and this is clearly.
For example in the temperature that is designed to food when detecting delivery temperature and reach 70 ℃ just reaches 100 ℃ micro-wave oven, if food heats in heating clamber when heating clamber reaches temperature more than 70 ℃, can imagine how the temperature with food has nothing to do, delivery temperature can reach 70 ℃ at short notice, and this also is clearly.
As mentioned above, even the measurement of temperature in the heating clamber and delivery temperature has obtained to detect the collateral information of the heated condition of food, can not obtain to be enough to directly control the information of micro-wave oven.
Studying now a kind of method that is suitable for detecting the heated condition of food most, after instant food is heated to the boiling point of water, the moisture boiling in the food, a large amount of moisture is discharged into outside the food, causes humidity in the heating clamber to rise and detects this state.
So long as not heating in the airtight container that food is placed on resemble the pressurizing vessel, under the condition of the correlation that the temperature and humidity that keeps food rises, the method that detects the humidity rising can be described as a kind of good method.
As the sensor of measuring humidity, known have two kinds of relative humidity sensor and absolute humidity sensors, and the conventional example of using these sensors is described as follows.
For example the spy drives the micro-wave oven of disclosed use relative humidity sensor in the clear 53-77365 communique shown in Figure 69, carry out dividing potential drop by the voltage that utilizes 3 pairs of interchange reference power supplies 53 of resistance, detect the variation of the resistance value of relative humidity sensor 52, the control micro-wave oven.
Relative humidity sensor 52 is a kind of sintered bodies that contain the metal oxide of ionised species, and the conductivity of its ion changes along with the absorption of moisture, thereby its resistance value changes.
Therefore, relative humidity sensor 52 must add alternating voltage in order not produce the characteristic variations that is caused by electrolysis.In addition, owing to utilize the crystal boundary phenomenon of detecting element,, burn dirt etc. with heater termly, aspect maintenance, will do many work so in order to ensure accuracy of detection with prevent that crystal boundary from stopping up, must be incubated with heater.
In addition, for example special micro-wave oven of opening disclosed use absolute humidity sensor in the clear 59-115918 communique is shown in Figure 70, at 2 thermistor R by absolute humidity sensor 54 1, R 2With 2 resistance R 3, R 4Among the electric bridge B that constitutes, pass through current-limiting resistance R by dc source 2 5Supply with electric current, by the output of differential amplifier 55 acquisition electric bridge B, control micro-wave oven.
Absolute humidity sensor 55 is coupled together by 2 bead thermistors that are encapsulated in respectively in the canister and constitutes, and therein one has encapsulated thermistor R 1Canister be provided with perforate, make thermistor R 1Contact with outside air, and encapsulated thermistor R at another 2Canister in encapsulated dry air.
The principle that absolute humidity sensor 55 detects humidity is to utilize the thermal conductivity of the air that contains moisture to increase this fact with the amount of contained humidity with being directly proportional.2 thermistor R 1, R 2Pass through current-limiting resistance R by dc source 2 5Supply with electric current, be heated to voluntarily about 200 ℃, have resistance value R respectively by at this moment temperature decision 1, R 2
Constitute the resistance R of electric bridge B 3, R 4Strictly set R for 1R 4=R 2R 3, keep balance, so that electric bridge B is output as zero.Make the air that contains moisture enter one now and encapsulated thermistor R 1Canister in, suppose that has encapsulated a thermistor R 1Canister in thermal conductivity become big because another has encapsulated thermistor R 2Canister in thermal conductivity constant, so thermistor R only 1Be cooled, resistance value increases.Therefore, the balance of electric bridge B is destroyed, produces output voltage.
As mentioned above, because the physical phenomenon of utilizing the thermistor be encapsulated in the heating voluntarily in the canister degree by canister heat release cooling to change along with the variation of the thermal conductivity in the canister, so do not need as using relative humidity sensor, use the interchange reference power supply in order not produce ionic polarization, also do not need to carry out to reach maintenance operations such as burning dirt termly with heater with the heater insulation.
, the thermistor R that produces owing to variation by thermal conductivity 1Resistance variations minimum, so as illustrating, the balance of must the utmost point strictly adjusting the resistance of electric bridge B, must automatically adjust the balance of the resistance of electric bridge B during actual the use, perhaps not to utilize absolute output level but the increment that utilizes relative output level, eliminate the imbalance of the electric bridge B that detects, in this respect spended time.
In the mode of this existing use relative humidity sensor, in order not produce the characteristic variations that causes by electrolysis, have to use baroque ac reference voltage source, and in order to prevent that crystal boundary from stopping up, must be incubated with heater, burn dirt etc. with heater termly, have the problem of the peripheral circuit structure complicated of sensor.
In the mode of using absolute humidity sensor, though do not produce the problems referred to above, but it is inevitable thermistor element must being encapsulated in the manufacturing process that waits in the canister complicated, in addition, in order to keep requiring the balance of extremely strict bridge circuit, existence must have strict adjustment operation and make the autobalance of the peripheral circuit structure complicated of sensor adjust the problem of structure.
The present invention develops in order to address the above problem, purpose is to provide the device of a kind of energy with the heated condition of simple structure detection food, another purpose be to provide a kind of can be efficiently and the reliability highland detect the device of the heated condition of food, another purpose is to provide a kind of micro-wave oven with various control functions of easy this device of use.
The described micro-wave oven in the 1st aspect of the present invention has: the heating clamber of accommodating heating object; The microwave generating apparatus of the heating object in the heating heating clamber; Send the cooling fan of cooling air to microwave generating apparatus; With the suction unit in the part guiding heating clamber of cooling air; Gas in the heating clamber is discharged into the outer exhaust portion of heating clamber; Contact the thermistor element sensor that is provided with the gas of emitting by the heating object in the heating clamber; And be the size of AC compounent of the signal of foundation according to the resistance value with the thermistor element sensor, above-mentioned microwave generating apparatus is powered and the control device of the control of cutting off the power supply.
The control device of the described micro-wave oven in the 2nd aspect of the present invention has: the AC amplifier that amplifies the AC compounent of the detected signal of thermistor element sensor; The voltage setting device of the reference voltage that the predetermined fluidized state of setting detection is used; The output voltage of AC amplifier and the reference voltage of voltage setting device are compared the comparison means of output power-off signal when the output voltage of AC amplifier is bigger than reference voltage; The firing switch of output power supply signal; And receive the drive unit that cuts off the electric power of supplying with to above-mentioned microwave generating apparatus behind the power supply signal of firing switch to above-mentioned microwave generating apparatus power supply after receiving from the power-off signal of comparison means.
The described thermistor element sensor in the 3rd aspect of the present invention is the bead thermistor element that has the glass coating, it is to install like this, promptly, an end that makes the glass coating makes the other end of the lead division that comprises the glass coating that has been covered be exposed in the above-mentioned heating clamber air outward in heating clamber or leading to from heating clamber on the outside path and emitting gas from heating object and contact simultaneously.
The described thermistor element sensor in the 4th aspect of the present invention is configured near the corner that the field intensity of the electric field that is produced by microwave generating apparatus in the heating clamber dies down.
The described thermistor element sensor in the 5th aspect of the present invention is configured on the sidewall that is provided with microwave generating apparatus in the heating clamber.
The described thermistor element sensor in the 6th aspect of the present invention is configured in the gas with in the heating clamber that is provided with in the heating clamber and is attracted to the outer attraction portion place of heating clamber, and thermistor element sensor and attraction portion utilize the cooling air that is produced by above-mentioned cooling fan to cool off simultaneously.
The AC amplifier of the control device of the described micro-wave oven in the 7th aspect of the present invention has the low-pass characteristic of the cut-off frequency lower than 5Hz.
The AC amplifier of the described control device in the 8th aspect of the present invention has integrator, and this integrator has than exporting big average output corresponding to the input of short waveform of repetition period, exporting the long discharge time constant of charge constant of little average output corresponding to the input of long waveform of monostable repetition period.
The control device of the described micro-wave oven in the 9th aspect of the present invention has the time-setting mechanism of the setting-up time of the regulation set, and time set, this time set begins to measure the setting-up time of being set by time-setting mechanism by firing switch, and will be used for that reference voltage is set for the reference voltage instruction that is in the big voltage of the maximum output voltage of the AC amplifier under the fluidized state than heating object and export to the voltage setting device, output reference voltage instruction when surpassing setting-up time, be used for the reference voltage of voltage setting device is become from the big voltage of maximum output voltage that is in the AC amplifier under the fluidized state than heating object the setting voltage of regulation, the voltage setting device is according to from the instruction of the reference voltage of time set, reference voltage set for than heating object be in the big voltage of the maximum output voltage of fluidized state AC amplifier of following time or the setting voltage of regulation.
The drive unit of the control device of the described micro-wave oven in the 10th aspect of the present invention has: the time-setting mechanism of setting the setting-up time of regulation; Be arranged between thermistor element sensor and the AC amplifier or between AC amplifier and the comparison means or between comparison means and the drive unit, the switching device that when receiving cut-off signal, just disconnects, when receiving connection signal, just connects; And begin to measure the setting-up time of setting by time-setting mechanism, and cut-off signal is exported to switching device, the time set of output connection signal when surpassing setting-up time by firing switch.
The drive unit of the control device of the described micro-wave oven in the 11st aspect of the present invention has deferred mount, and after this deferred mount was received the power supply signal of firing switch, delay stipulated time was powered to microwave generating apparatus then.
The drive unit of the control device of the described micro-wave oven in the 12nd aspect of the present invention has deferred mount, and after this deferred mount was received power-off signal from comparison means, delay stipulated time disconnected the electric power of supplying with to cooling fan then.
The free setting device of control device and the time set of the described micro-wave oven in the 13rd aspect of the present invention, above-mentioned time-setting mechanism is from receiving the power supply signal of firing switch, measure to receiving from till the power-off signal of comparison means, time till promptly seething with excitement to heating object, and set the time expand that this Measuring Time be multiply by the multiplying power of regulation, above-mentioned time set begins to count this time expand when receiving the power-off signal from comparison means, after the counting of this time expand finishes, to drive unit output power-off signal.
The described micro-wave oven in the 14th aspect of the present invention also has and accommodate the food bowl that keeps heating object and the weight sensor of the weight of the above-mentioned heating object of measurement that is connected with food bowl in heating clamber, control device has the time-setting mechanism of setting the predetermined heating time corresponding with the weight of weight sensor measurement, and time set, this time set is from receiving the power supply signal of firing switch, the predetermined heating time that counting is set by time-setting mechanism, after the counting of this heat time heating time finishes, to drive unit output power-off signal, drive unit receives from the power-off signal of comparison means with from behind any one signal in these two signals of power-off signal of time set, cuts off the electric power of supplying with to microwave generating apparatus.
The control device of the described micro-wave oven in the 15th aspect of the present invention has the resistance value according to the thermistor element sensor, the integrator of the AC compounent of signal being removed and DC component being passed through, the voltage setting device is set the reference voltage of regulation according to the size of the DC component that obtains by integrating gear.
The resistance value of the with good grounds thermistor element sensor of control device of the described micro-wave oven in the 16th aspect of the present invention is removed the AC compounent of signal and integrator that DC component is passed through; The high temperature voltage setting device of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used; And the high temperature reference voltage that the size and the high temperature voltage setting device of the DC component that obtains by integrator are set compares, when the size of the DC component that obtains by integrator is bigger than high temperature reference voltage, the high temperature comparison means of output starting inhibit signal, after drive unit is received the power supply signal of firing switch, to the microwave generating apparatus supply capability, after receiving power-off signal from comparison means, the electric power that cut-out is supplied with to microwave generating apparatus, and after the starting inhibit signal of receiving from the high temperature comparison means, even receive the power supply signal of firing switch, also forbid to the microwave generating apparatus supply capability, and after receiving the power supply signal of firing switch, even receive starting inhibit signal, also continue to the microwave generating apparatus supply capability from the high temperature comparison means.
After the control device of the described micro-wave oven in the 17th aspect of the present invention has the power supply signal and the starting inhibit signal from the high temperature comparison means of receiving firing switch, the notifying device that gives the alarm.
The resistance value of the with good grounds thermistor element sensor of control device of the described micro-wave oven in the 18th aspect of the present invention is removed the AC compounent of signal and integrator that DC component is passed through; The high temperature voltage setting device of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used; And the high temperature reference voltage that the size and the high temperature voltage setting device of the DC component that obtains by integrator are set compares, when the size of the DC component that obtains by integrator is bigger than high temperature reference voltage, the high temperature comparison means of output starting inhibit signal, when the voltage setting device is received from the switching signal of high temperature comparison means, reference voltage is switched to voltage more than the maximum output voltage that heating object is in fluidized state AC amplifier of following time from the setting voltage of regulation.
The resistance value of the with good grounds thermistor element sensor of control device of the described micro-wave oven in the 19th aspect of the present invention is removed the AC compounent of signal and integrator that DC component is passed through; The high temperature voltage setting device of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used; The high temperature reference voltage that the size and the high temperature voltage setting device of the DC component that obtains by integrator are set compares, when the size of the DC component that obtains by integrator is bigger than high temperature reference voltage, the high temperature comparison means of output starting inhibit signal; And be arranged between thermistor element sensor and the AC amplifier or AC amplifier and above-mentioned comparison means between or between comparison means and the drive unit, usually closed, have only the switching device that when receiving switching signal, just disconnects.
The resistance value of the with good grounds thermistor element sensor of control device of the described micro-wave oven in the 20th aspect of the present invention is removed the AC compounent of signal and integrator that DC component is passed through; At least set a kind of room temperature voltage setting device of room temperature reference voltage of regulation; And at least a room temperature reference voltage that the size and the room temperature voltage setting device of the DC component that obtains by integrator are set compares, when the size of the DC component that obtains by integrator is bigger than room temperature reference voltage, export the room temperature comparison means of each switching signal, time-setting mechanism is when each switching signal of receiving from the room temperature comparison means, and will heat time heating time switching to corresponding with the temperature in the heating clamber from the setting-up time of regulation be each predetermined heating time of basis with various weight.
The described micro-wave oven in the 21st aspect of the present invention also has the heater heater of the heating of the gas in the heating clamber and the heater heating control apparatus of control heater heater, the heater heating control apparatus has: according to the resistance value of thermistor element sensor, the AC compounent of signal removed and integrator that DC component is passed through; Set the temperature setting device of temperature desired reference voltage; The temperature reference voltages that the size and the temperature setting device of the DC component that obtains by integrator are set compares, when the size of the DC component that obtains by integrator than temperature reference voltages hour, export the temperature comparison means of the 2nd power supply signal; Export the thermostat firing switch of the 1st power supply signal; Set the time-setting mechanism of desirable heat time heating time; The 1st power supply signal according to the thermostat firing switch begins to measure the heat time heating time of being set by time-setting mechanism, the time set of output power-off signal when surpassing heat time heating time; And from occur the 1st power supply signal begin till the power-off signal that time set occurs during, have only when receiving the 2nd power supply signal of temperature comparison means just to heater heater supply capability, after receiving power-off signal from time set, the heater driving device of the electric power of sever supply heater heater.
Fig. 1 is the microwave oven structure figure of embodiments of the invention 1;
Fig. 2 is the skiagraph of this micro-wave oven;
Fig. 3 is the oblique view of the thermistor element sensor of this micro-wave oven;
Fig. 4 is the sectional drawing of the installment state of the thermistor element sensor in the presentation graphs 3;
Fig. 5 is the oblique view of another thermistor element sensor of this micro-wave oven;
Fig. 6 is the sectional drawing of the installment state of the thermistor element sensor in the presentation graphs 5;
Fig. 7 is the oscillogram and the frequency analysis figure of thermistor element signal of sensor;
Fig. 8 is the concrete circuit diagram of the control device of this micro-wave oven;
Fig. 9 is the oscillogram and the waveform amplification figure of the output signal of the AC amplifier in the control device shown in Figure 8;
Figure 10 is the circuit diagram that expression replaces the 1st distortion of the AC amplifier in the control device shown in Figure 8;
Figure 11 is the circuit diagram of another integration enlarging section of the AC amplifier among expression Figure 10;
Figure 12 is the circuit diagram that expression replaces the 2nd distortion of the AC amplifier in the control device shown in Figure 8;
Figure 13 is the skiagraph of the 1st distortion of this micro-wave oven of expression;
Figure 14 is the cross-sectional view of the 1st distortion of this micro-wave oven of expression;
Figure 15 is the skiagraph of the 2nd distortion of this micro-wave oven of expression;
Figure 16 is the curve map of the output peak value of expression thermistor element signal of sensor;
Figure 17 is thermistor element sensor temperature and heating clamber temperature corresponding characteristics curve map;
Figure 18 is the frequency analysis figure when being coated in silicone grease on the thermistor element sensor;
Figure 19 is with silicone grease coating and the output frequency analysis figure of the AC amplifier when not being coated on the thermistor element sensor;
Figure 20 is the frequency characteristic curve diagram of the AC amplifier among Fig. 8;
Figure 21 is the circuit diagram that expression replaces the 3rd distortion of the AC amplifier in the control device shown in Figure 8;
Figure 22 is the working time figure of the AC amplifier among explanation Figure 21;
Figure 23 is that expression is with the differentiator of the AC amplifier among Figure 21 and the circuit diagram of another distortion after the integrator combination;
Figure 24 is the microwave oven structure figure of embodiments of the invention 2;
Figure 25 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 26 is the working time figure of the control device among explanation Figure 25;
Figure 27 is the circuit diagram that expression replaces the 1st distortion of the time set in the control device shown in Figure 25;
Figure 28 is the circuit diagram that expression replaces the 2nd distortion of the time set in the control device shown in Figure 25;
Figure 29 is the circuit diagram that expression replaces the 3rd distortion of the time set in the control device shown in Figure 25;
Figure 30 is the circuit diagram that expression replaces the 4th distortion of the time set in the control device shown in Figure 25;
Figure 31 is the 1st block diagram that is out of shape of the control device of this micro-wave oven of expression;
Figure 32 is the 2nd block diagram that is out of shape of the control device of this micro-wave oven of expression;
Figure 33 is the circuit diagram that expression replaces the 1st distortion of the drive unit in the control device shown in Figure 25;
Figure 34 is the working time figure of the drive unit among explanation Figure 33;
Figure 35 is the circuit diagram that expression replaces the 2nd distortion of the drive unit in the control device shown in Figure 25;
Figure 36 is the microwave oven structure figure of embodiments of the invention 3;
Figure 37 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 38 is the circuit diagram that expression replaces the 1st distortion of the time-setting mechanism in the control device shown in Figure 37;
Figure 39 is the circuit diagram that expression replaces the 2nd distortion of the time-setting mechanism in the control device shown in Figure 37;
Figure 40 is the output characteristic curve figure of the time-setting mechanism among Figure 39;
Figure 41 is the circuit diagram that expression replaces the 1st distortion of the time set in the control device shown in Figure 37;
Figure 42 is the circuit diagram that expression replaces the 2nd distortion of the time set in the control device shown in Figure 37;
Figure 43 is the microwave oven structure figure of embodiments of the invention 4;
Figure 44 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 45 is the output characteristic curve figure of the time-setting mechanism in the control device shown in Figure 44;
Figure 46 is the performance diagram of heat time heating time of the work of the control device of explanation among Figure 44;
Figure 47 is the circuit diagram that expression replaces the 1st distortion of the time-setting mechanism in the control device shown in Figure 44;
Figure 48 is the circuit diagram that expression replaces the 2nd distortion of the time-setting mechanism in the control device shown in Figure 44;
Figure 49 is the working time figure of the time-setting mechanism among explanation Figure 48;
Figure 50 is the circuit diagram that expression replaces the 1st distortion of the time set in the control device shown in Figure 44;
Figure 51 is the circuit diagram that expression replaces the 2nd distortion of the time set in the control device shown in Figure 44;
Figure 52 is the microwave oven structure figure of embodiments of the invention 5;
Figure 53 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 54 is the output characteristic curve figure of the voltage setting device in the control device shown in Figure 53;
Figure 55 is the microwave oven structure figure of embodiments of the invention 6;
Figure 56 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 57 is the microwave oven structure figure of embodiments of the invention 7;
Figure 58 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 59 is the heat time heating time and the temperature characteristics figure of the control device work of this micro-wave oven of explanation;
Figure 60 is the 1st block diagram that is out of shape of the control device of this micro-wave oven of expression;
Figure 61 is the 2nd block diagram that is out of shape of the control device of this micro-wave oven of expression;
Figure 62 is the microwave oven structure figure of embodiments of the invention 8;
Figure 63 is the concrete circuit diagram of the control device of this micro-wave oven;
Figure 64 is the output characteristic curve figure of the time-setting mechanism in the control device shown in Figure 63;
Figure 65 is the heat time heating time performance diagram corresponding with food weight of the work of the control device shown in explanation Figure 63;
Figure 66 is the microwave oven structure figure of embodiments of the invention 9;
Figure 67 is the concrete circuit diagram of the 1st control device of this micro-wave oven;
Figure 68 is the concrete circuit diagram of the 2nd control device of this micro-wave oven;
Figure 69 is the block diagram of existing micro-wave oven;
Figure 70 is the block diagram of existing another micro-wave oven.
Embodiment 1
Fig. 1 is the microwave oven structure figure of embodiments of the invention 1.
Among Fig. 1, carry out dividing potential drop, obtain output V with thermistor element sensor 1 resistance value corresponding and the voltage E of 3 pairs of dc reference power supplys 2 of resistance with temperature THThe output V of thermistor element sensor 1 THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to the output of AC amplifier 4 and the reference voltage Δ V that is used by voltage setting device 5 predefined detection fluidized states TThe comparison means 6 that compares, firing switch 7 and constitute by firing switch 7 and comparison means 6 control power supplies drive unit 8 with outage.
Control device 9 control magnetrons are microwave generating apparatus 10 and the cooling fan 11 that drives with fan electromotor, power and cut off the power supply.
Food 14 is placed in the heating clamber 13, is imported in the heating clamber 13 by suction unit 15 with the part of the cooling air behind the cooling fan 11 cooled microwave generating means 10.Represent the part of cooling air with solid arrow 16, the gas that contains moisture etc. that 17 expressions of with dashed lines arrow are emitted from food 14.Cooling air 16 and be discharged into the outside by exhaust portion 18 from heating clamber 13 from the gas 17 that contains moisture etc. that food 14 is emitted.Thermistor element sensor 1 is installed in exhaust portion 18, contacts with the gas 17 that contains moisture etc. of emitting from food 14.
Fig. 2 is the skiagraph of micro-wave oven of the present invention.The electromagnetic wave power of microwave generating apparatus 10 is 500W, and the waveguide portion 19 of the sidepiece of microwave by being located at heating clamber 13 supplies to heating clamber 13, drives food bowl 20 with motor 21 rotations.
The working condition of the micro-wave oven of the embodiments of the invention 1 in next key diagram 1.
After peace was pressed firing switch 7, power supply signal was transfused to drive unit 8, and drive unit 8 drives microwave generating apparatus 10 and cooling fan 11.Under this state, the AC amplifier 4 of the control device 9 of micro-wave oven is according to the resistance value amplifying signal V of thermistor element sensor 1 THAC compounent, the reference voltage Δ V of the output voltage of 6 pairs of AC amplifiers 4 of comparison means and voltage setting device 5 TCompare, when the output voltage of AC amplifier 4 than detecting the reference voltage Δ V that fluidized state is used TWhen big, power-off signal is exported to drive unit 8, after drive unit 8 is received power-off signal from comparison means 6, cut off electric power to microwave generating apparatus 10 and cooling fan 11 supplies.Like this, control device 9 is followed the heating process of the heating object instant food in the heating clamber 13, microwave generating apparatus 10 grades is powered to cut off the power supply control.Thereby the energy implementation structure extremely simply has the micro-wave oven of heated condition measuring ability.
Fig. 3 is the oblique view of thermistor element sensor of the present invention.Fig. 4 is the sectional drawing of the installment state of the thermistor element sensor in the presentation graphs 3.Thermistor element sensor 1 is by being sandwiched in the thermistor elements 23 of 2 lead-in wires between 22,22 through glass lining portion 24 molded forming, and 2 lead-in wires 22,22 are fixed in the glass lining portion 24, and pass insulation division 25 and draw.Insulation division 25 passes substrate 26 configurations, and the end of insulation division 25 is fixed on the substrate 26 with bonding agent 27.The thermistor element sensor 1 of Gou Chenging utilizes the through hole 28,28 on the substrate 26 to pass the wall 29 of exhaust portion 18 like this, is installed on the wall 29 with screw 30,30.
Therefore, thermistor element sensor 1 is to be provided with like this, just make with the thermistor element 23 molded glass lining portions 24 that form with contact from heating clamber 13 the gas 17 that contains the moisture of emitting from food as the air-flow of discharging through exhaust portion 18 dischargings, lead-in wire 22,22 contact with the extraneous air of heating clamber 13, so thermistor element sensor 1 can tolerate high temperature and moist baneful influence, can detect the variation of temperature that causes by the gas 17 that contains the moisture of emitting from food delicately, simultaneously because lead-in wire 22,22 not with heating clamber 13 in high temperature and the gas that contains large quantity of moisture contact, so can not reduce lead-in wire 22 through moisture, insulating properties between 22 can obtain the high sensor of reliability.
The temperature height of the air-flow of discharging owing to contact with heating clamber 13 air outside, lead-in wire 22,22 is cooled, so even also can prevent to export decline.
Fig. 5, Fig. 6 be micro-wave oven of the present invention another thermistor element sensor oblique view and the expression installment state sectional drawing.The insulation division 25 of thermistor element sensor 1 passes and is configured on the protuberance of being located on the substrate 26 31, is fixed on the substrate 26 with the end of bonding agent 27 with insulation division 25 in protuberance 31, and protuberance 31 passes and is installed on the wall 29 of exhaust portion 18.
Therefore, insulation division 25 is securely fixed on the substrate 26, simultaneously owing to directly do not contact with the wall 29 of exhaust portion 18, so the stress that applies when installing can not make insulation division 25 breakages, become higher owing to protrude in the height of substrate 26, so can will carry out the center that molded glass lining portion 24 is configured in exhaust jet stream to thermistor element 23.
Fig. 7 is the oscillogram and the frequency analysis figure of thermistor element signal of sensor.Show the data example of output signal and noise, Fig. 7 (a) shows the preceding signal waveform example of water boiling in the heating clamber 13, the signal waveform example when Fig. 7 (b) shows the water boiling.Fig. 7 (c) shows the example as a result of these waveforms being carried out spectrum analysis, and (1) among Fig. 7 (c) is the situation that the water in the heating clamber 13 have seethed with excitement, and (2) be the situation before the boiling, and (3) are the situations after beginning to heat.By the hot blast that contains moisture is contacted with thermistor element sensor 1, can export bigger signal in the frequency band range below 10Hz as can be known.(1) and (2) differ about 15dB V 2(about 30 times), signal level reaches the voltage of several mV.Reach about 40dB V with (3) as noise level 2(about 10,000 times) so can not be subjected to the influence of the noise levels such as electromagnetic noise in the micro-wave oven, can control micro-wave oven.
The mechanism of utilizing thermistor element sensor of the present invention 1 to detect the water boiling is: because a large amount of water vapours and the heating clamber 13 interior air that boiling is discharged in the heating clamber 13 mix, make the air heating in the heating clamber 13, itself condensation simultaneously, be so-called steam condition, the temperature of the air in the heating clamber 13 and the distribution of heat become inhomogeneous, thermistor element sensor 1 with contain the air of temperature and contact with heat water vapour pockety, temperature is by the time sequence variation, in fact the resistance value as the thermistor element sensor 1 of temperature sensor is the sequential variation, output V THAlso by the time sequence variation.
As mentioned above, according to detecting one of conclusion that mechanism draws be: if the temperature of thermistor element sensor 1 and the temperature around the thermistor element sensor 1 are remained on low-temperature condition, impel the water vapour condensation, the temperature of the air that contacts with thermistor element sensor 1 and heat distribute and become more inhomogeneous, the heat of passing to thermistor element sensor 1 simultaneously increases, thereby variation of temperature increases, and can detect the boiling of water delicately.Another embodiment that obeys this conclusion hereinafter will be described.
As mentioned above, in embodiments of the invention 1, with the resistance value that contact the thermistor element sensor 1 that is provided with gas 17 that the food in heating clamber 13 is emitted is that the AC compounent of the signal of foundation is imported into the heating process of the heating object instant food in the heating clamber 13 of following micro-wave oven and microwave generating apparatus 10 is powered the control device 9 that outage controls, therefore do not need as using the relative temperature sensor, use baroque ac reference voltage source for fear of electrolysis, and must be incubated with heater in order to prevent crystal boundary from stopping up, burn dirt etc. with heater termly and will carry out the work of many complexity aspect the maintenance.
In addition, do not need as using absolute humidity sensor yet, thermistor element to be encapsulated in the canister of manufacturing process's complexity, carry out the extremely strict detection of requirement and adjust operation, perhaps will have the autobalance of circuit structure complexity to adjust circuit with the balance of bridge circuit.
Fig. 8 is the physical circuit figure of the micro-wave oven control device of embodiments of the invention 1, by relay, transistor, operational amplifier A 1～A 3, Philips's flop-over circuit, diode, resistance and electric capacity is formed by combining.AC amplifier 4 passes through with differentiator 401 with by operational amplifier A 1Combined Deng the integration enlarging section 402 that constitutes, have the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth.It is the low-pass characteristic that AC amplifier 4 has the cut-off frequency lower than 5Hz.In addition, the differentiator 403 of the 403a by rectifier cell is arranged is and by operational amplifier A 2The positive enlarging section 404 that constitutes connects, and can obtain the positive output higher than the earthing potential of circuit.When the output of AC amplifier 4 is compared by voltage setting device 5 predefined reference voltage Δ V TWhen big, operational amplifier A 3Comparison means 6 with operational amplifier A 3Output state anti-phase.Drive unit 8 drives control like this, to be about to include the latch means of pushing firing switch 7 these information be 801 set of Philips's flop-over circuit and latch, after the output state of comparison means 6 is anti-phase, Philips's flop-over circuit 801 is resetted, only when Philips's flop-over circuit 801 is in SM set mode, just drive the contact of relay 803, power to microwave generating apparatus 10 and cooling fan 11 by commercial power 32 by transistor 802.
Fig. 9 is the oscillogram and the waveform amplification figure of the output signal of the AC amplifier in the control device shown in Figure 8, and the waveform when Fig. 9 (a) is heating 400cc water, Fig. 9 (b) are the waveforms after the waveform in (a) was amplified by the time.
Figure 10 is the circuit diagram that expression replaces the 1st distortion of the AC amplifier in the control device shown in Figure 8, shows by dc reference power supply 2 to the single supply operational amplifier A 1, A 2The single supply operational amplifier A is used in power supply 1, A 2Constitute the circuit example of AC amplifier 4.If adopt this embodiment, do not use rectifier cell even connect the differentiator 403 of integration enlarging section 402 and positive enlarging section 404, will input be transfused to single supply operational amplifier A to integration enlarging section 402 and positive enlarging section 404 as positive than the low negative potential of earthing potential 1, A 2The time, each single supply operational amplifier A 1, A 2With earthing potential output and full closing, so the output of AC amplifier 4 can often obtain the forward output higher than earthing potential, the 403a of the rectifier cell that need not be made of diode also can obtain the characteristic same with AC amplifier shown in Figure 84.
Figure 11 is the circuit diagram of another integration enlarging section 402 of the AC amplifier among expression Figure 10, is the circuit example that constitutes with integrator 402a and positive amplifier 402b, can obtain and the identical characteristic in integration enlarging section shown in Figure 10.
Figure 12 is the circuit diagram that expression replaces the 2nd distortion of the AC amplifier in the control device shown in Figure 8, is the single supply operational amplifier A of utilizing by 2 power supplies of dc reference power supply 1, A 2, constitute by the single supply operational amplifier A 1In the active bypass filtering portion 411 that constitutes with by the single supply operational amplifier A 2In the active low-pass filter portion 413 that constitutes, with differentiator 412 both are coupled together, constitute the example of AC amplifier 4 with bandpass shape, the cut-off characteristics of this AC amplifier 4 is-6dB/OCT is (during 1 times of frequency change, output becomes 0.5 times), become more sharp-pointed, so have the effect that the induction of commercial frequency is removed than the cut-off characteristics-3dB/OCT of the AC amplifier 4 of the embodiment among Fig. 8, Figure 10 and Figure 11 (frequency change 1 times time, output becomes 0.7 times).
Figure 13, Figure 14 are the skiagraph and the cross-sectional views of the 1st distortion of expression micro-wave oven of the present invention.Among the figure, thermistor element sensor 1 is arranged near the corner of heating clamber 13, pass and the outside cup-shaped sensor stand 33 that is provided with that is connected of the wall of heating clamber 13 from the outside, the air in the air of sensor stand 33 inboards and the heating clamber 13 can freely circulate by the through hole of opening on the wall of heating clamber 13 34.
The cooling air 16 of the gas 17 that contains moisture etc. be imported into heating clamber 13 from suction unit 15 in of emitting from food 14, roughly be discharged into heating clamber 13 outsides from being located in the exhaust portion 18 at the diagonal angle of same horizontal direction with suction unit 15, but the part 35 of the gas of emitting from food 14 is along with being Vorticose tributary near the proximity transducer support 33, and contacts with thermistor element sensor 1 by passage 34 backs.
Near the corner of Figure 13 and heating clamber 13 shown in Figure 14, because it is low by the electric-field intensity that waveguide portion 19 is transmitted into the microwave in the heating clamber 13 by microwave generating apparatus 10, so the wall of heating clamber 13 and near air are difficult to by heating using microwave, in addition, near the air thermistor element sensor 1 and the thermistor element sensor 1 do not cause temperature to reach the air-flow that the highest air promptly discharges and directly contacts, so can keep low-temperature condition with the heating of following food 14.Thereby can detect the boiling of food more accurately.
As Figure 13 and shown in Figure 14, if thermistor element sensor 1 is configured on the same sidewall of the heating clamber 13 that is provided with microwave generating apparatus 10, then being transmitted into microwaves in the heating clamber 13 from waveguide portion 19 is difficult to arrive near the installation position of thermistor element sensor 1, thermistor element sensor 1 and near air thereof can keep lower temperature, and the cooling air that can expect simultaneously easily to utilize the cooling fan 11 of cooled microwave generating means 10 usefulness to produce makes the effect of thermistor element sensor 1 and sensor stand 33 coolings etc.
Figure 15 is the skiagraph of the 2nd distortion of expression micro-wave oven of the present invention.Thermistor element sensor 1 passes and is configured on the wall of close cooling fan 11 of attraction portion 36, and this attraction portion 36 utilizes the attraction of cooling fan 11 to attract gas in the heating clamber 13.Thermistor element sensor 1 after being attracted by attraction portion 36, the part of the gas that contains moisture etc. of emitting from food 14 becomes the part of cooling air 16, so can contact with the gas 17 that contains moisture etc. of emitting from food 14.
The end of attraction portion 36 and near be configured in position near cooling fan 11, so the wall of attraction portion 36 and being configured near the thermistor element sensor 1 on the wall of the attraction portion 36 of cooling fan 11 by the air-breathing of cooling fan 11 or supply gas and be cooled can keep low temperature.Therefore thermistor element sensor 1 and ambient air temperature thereof rise seldom, can detect the boiling of food more accurately.
The maximum output peak value (relative value) of the temperature-sensitive electricity set of pieces signal of sensor when Figure 16, Figure 17 represent to change successively the water of 100cc respectively and make its boiling repeatedly and by the output V of temperature-sensitive electricity set of pieces sensor THThe temperature of trying to achieve respectively with heating clamber in the data example of air themperature corresponding characteristics, situation when (1) expression among Figure 16, Figure 17 is configured in exhaust portion 18 with thermistor element sensor 1, (2) expression is configured in the situation of the corner of heating clamber 13, the situation when (3) expression is configured in attraction portion 36.The temperature of expressing significantly when thermistor element sensor 1 rises after a little while, the output peak value is difficult for descending, particularly under the situation that is configured in attraction portion 36 of (3), even the temperature of thermistor element sensor 1 rises, peak value does not descend yet, show significantly along with the gas that contains moisture etc. of emitting from food 14 is cooled, the phenomenon that causes water vapour to be condensed, can think that the skewness degree of temperature and heat has surpassed the decline degree of the heat of passing to thermistor element sensor 1 because the temperature of thermistor element sensor 1 rises.As mentioned above, for make thermistor element sensor 1 and thermistor element sensor 1 around keep low temperature, be difficult to the position of being heated in the heating clamber 13 if thermistor element sensor 1 is configured in by microwave generating apparatus 10, the interchange output that just can prevent thermistor element sensor 1 follows the temperature of heating clamber 13 to rise and descend, in addition, if with thermistor element sensor 1 and cooling on every side thereof, then can obtain great effect, this is clearly.
In the micro-wave oven of heated food, emit various materials from heated food product based on oil, can expect that these materials are attached on the thermistor element sensor 1, the output of thermistor element sensor 1 is changed, therefore the silicone grease of coating and glass lining portion 24 roughly the same volumes in the glass lining portion 24 of thermistor element sensor 1 carries out the frequency analysis that spectrum analysis obtains to the output of thermistor element sensor 1 and is illustrated in Figure 18.In Figure 18, (1) is the situation that the water in the heating clamber 13 have seethed with excitement, and (2) be the situation before the boiling, and (3) are the situations after beginning to heat.The result who result among Figure 18 and thermistor element sensor 1 is among Fig. 7 (c) of original state compares, when 5Hz is following output similar, but frequency is when 5Hz is above, the output valve among Figure 18 diminishes.
Secondly, as shown in Figure 8 about 5Hz of the cut-off frequency of the output of thermistor element sensor 1 when water is seethed with excitement, the Figure 19 that the results are shown in that carries out spectrum analysis with AC amplifier 4 amplifications with the low-pass characteristic below the 5Hz.Among the figure, (1) is to use the situation of the thermistor element sensor 1 of original state, and (2) are the situations that has applied silicone grease in the glass lining portion 24 of thermistor element sensor 1.As seen from the figure, owing to use AC amplifier 4, so can obtain almost indiscriminate output when the original state of thermistor element sensor 1 and coating silicone grease with the following low-pass characteristic of 5Hz.
The frequency characteristic of the AC amplifier 4 among Fig. 8 that Figure 20 represents to use in the above-mentioned measurement, owing to show output level with power meter, so output valve decline 1.5dB V 2Point (output valve becomes 0.7 times point) expression cut-off frequency.
AC amplifier 4 with such characteristic has the ability that can eliminate the electromagnetic noise in the above frequency band range of common commercial frequency effectively certainly.
, the output V of thermistor element sensor 1 THBe through AC amplifier 4 amplify the back with comparison means 6 with itself and reference potential Δ V TCompare, so even also can reply the output of the such contingency of noise.In order to handle the output of such contingency, known method is to be input in the comparison means 6 by the integrator with sufficiently long time constant., if use integrator, because the boiling of water,, make replying to produce very big hysteresis to comparison means 6 even the output of thermistor element sensor 1 increases with sufficiently long time constant.
In order to address this problem, the differentiator 403 of rectifier cell 403a in will having control device shown in Figure 8 is configured in the AC amplifier 4 between integral amplifier 402 and the positive amplifier 404, and being connected with the differentiator 403 that rectifier cell 403a is arranged is provided with charging resistor R 1With discharge resistance R 2Divide the integrator 405 be arranged, the AC amplifier 4 of Gou Chenging is illustrated in Figure 21 like this.
That is, Figure 21 is the circuit diagram that expression replaces the 3rd distortion of the AC amplifier in the control device shown in Figure 8.The discharge resistance R of the integrator 405 among Figure 21 2Select than charging resistor R 1Big fully, and charging resistor R 1Corresponding to waveform, export big average output, and the input of the waveform of growing corresponding to the monostable repetition period can obtain little average output with short repetition period input.Figure 22 is the working time figure of the AC amplifier among explanation Figure 21, Figure 22 (a) is the output waveform example of existing AC amplifier 4, (b) be the output waveform example of existing use AC amplifier 4 when discharging and recharging the integrator that time constant equates, the output waveform example of AC amplifier 4 when (c) being to use integrator 405 of the present invention.As seen from the figure, if use AC amplifier 4 with discharge time constant integrator 405 longer than charge constant, then can be without big time lag, and monostable signal absorption such as noise can be gone out, the signal with short repetition period that produces in the time of extracting simultaneously the water boiling clearly out, comparison means 6 can not produce vibration yet.
Figure 23 represents specifically, to be the differential resistance R that makes the differentiator 403 among Figure 21 with the differentiator 403 of the AC amplifier among Figure 21 4 and the circuit diagram of another distortion after integrator 405 combinations 1Charging resistor R with integrator 405 1General circuit structure example.
Circuit among Figure 23 is a kind of with the electricity consumption container C 1The forward component storage of the signal behind the differential is integrated to capacitor C 2In the circuit that is called as charge pump circuit 406.The combination of the working condition of this circuit and the differentiator among Figure 21 403 and integrator 405 is equivalence fully, if so use AC amplifier 4 with charge pump circuit 406, then can be without big time lag, and monostable signal absorption such as noise can be gone out, the signal with short repetition period that produces in the time of extracting simultaneously the water boiling clearly out, comparison means 6 can not produce vibration yet.
Embodiment 2
Figure 24 is the microwave oven structure figure of embodiments of the invention 2.Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to the output of AC amplifier 4 with by voltage setting device 5 predefined reference voltage Δ V TThe comparison means 6 that compares, firing switch 7, the drive unit 8 by comparison means 6 and firing switch 7 control power supplies and outage and begin to measure by the predetermined setting-up time T of time-setting mechanism 39 by firing switch 7 B, when surpassing setting-up time T BThe time, the reference voltage Δ V of change voltage setting device 5 TTime set 40 constitute.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 2 among Figure 24 is described.
During the micro-wave oven starting, in setting-up time by time set 40 regulations, the above magnitude of voltage of the maximum output valve of AC amplifier 4 when the reference voltage of voltage setting device 5 is set at food and is in fluidized state, behind the setting-up time through regulation, set the setting of the fluidized state that detects food.
Therefore, even in the heating clamber 13 is high temperature, but in setting-up time, relatively install 6 and power-off signal is not exported to drive unit 8, so press the rapid variation that the temperature that the action by cooling fan 11 causes is detected in firing switch 7 back, can not cause mistakenly stop to end, food seethes with excitement and just stops control after emitting the gas that contains moisture, can obtain the micro-wave oven of good operability.
Figure 25 is the concrete circuit diagram of the control device of embodiments of the invention 2.By relay and transistor Tr 1～Tr 3, the single supply operational amplifier A 1～A 4, Philips's flop-over circuit and resistance, electric capacity is formed by combining.AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2 Differentiator 401 and integration enlarging section 402 constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.
Compare the reference voltage Δ V that sets by voltage setting device 5 when the output of AC amplifier 4 TWhen big, the single supply operational amplifier A 3Be that comparison means 6 is with the single supply operational amplifier A 3Output state anti-phase.Drive unit 8 drives control like this, to be about to include the latch means of pushing firing switch 7 these information be 801 set of Philips's flop-over circuit and latch, after the output state of comparison means 6 is anti-phase, Philips's flop-over circuit 801 is resetted, only when Philips's flop-over circuit 801 is in SM set mode, just drive the contact of relay 803, power to microwave generating apparatus 10 and cooling fan 11 by commercial power 32 by transistor 802.
Time set 40 is by transistor 40a and single supply operational amplifier A 4Etc. formation, press firing switch 7 after, make capacitor C discharge by transistor 40a, after this to the voltage by the resistance R charging and with the setting-up time T that sets by time-setting mechanism 39 BSuitable voltage compares, from pressing firing switch 7 through setting-up time T BAfter, with the single supply operational amplifier A of time set 40 4Output anti-phase, voltage setting device 5 time set 40 make output anti-phase before turn-on transistor 50a, make reference voltage Δ V TRise to supply voltage E, time set 40 make output anti-phase after, return the reference voltage of regulation.In addition, the setting-up time T of time set 40 BUsually elect as about 30 seconds.
Figure 26 is the working time figure of the control device among explanation Figure 25.Shown in Figure 26 (a), when continuous use micro-wave oven causes when being the condition of high temperature in the heating clamber 13, in the time of maybe in the high temperature air that contains large quantity of moisture is trapped in heating clamber 13, after the micro-wave oven starting, cooling fan 11 begins to send cooling air 16, after sneaking in the cooling air 16, high temperature and the high temperature air that contains large quantity of moisture cause temperature distributing disproportionation, the air of temperature and heat skewness contacts with thermistor element sensor 1, identical output when seethe with excitement by AC amplifier 4 output just like with water, this state proceeds to heating clamber 13 interior air always and is replaced by cooling air 16 basically, till being evenly distributed of the temperature of the exhaust jet stream that thermistor element sensor 1 is contacted and heat.
The output state of the comparison means 6 the when output that Figure 26 (b) shows above-mentioned AC amplifier 4 is presented in the existing control device 9 stops in micro-wave oven and the starting under such state as can be known.
Figure 26 (c) shows by the fixed setting voltage Δ V of the voltage setting device among Figure 25 5 T, be illustrated in the setting-up time T that presses behind the firing switch 7 BInterior maintenance does not reach the supply voltage E of the output of AC amplifier 4, after this returns the setting voltage of regulation.
Figure 26 (d) shows the output state of the comparison means 6 that uses above-mentioned setting voltage, and expression is when food comes to life, and the output of comparison means 6 is carried out anti-phase repeatedly.
Figure 26 (e) shows the state of the relay contact of drive unit 8, and expression stops when food comes to life to microwave generating apparatus 10 power supplies.
Be appreciated that from above-mentioned each figure, owing to use time set 40 in the setting-up time after pressing firing switch 7, forbid by comparison means 6 accessory drives 8, so the mistakenly stop when preventing the starting of continuous use micro-wave oven ends, can constitute the food boiling and emit the micro-wave oven control device that just stops the good operability to control behind the gas that contains moisture.
Figure 27, Figure 28, Figure 29, Figure 30 represent to replace the 1st, the 2nd, the 3rd, the 4th circuit diagram that is out of shape of the time set in the control device shown in Figure 25 respectively, with time set 40 among the Figure 26 that had illustrated is that situation about being made of analog circuit is different, but constitute by digital circuit.
In Figure 27, time set 40 is that Philips's flop-over circuit 413 constitutes by stored count device 411, digital comparator 412, latch means, and the storage of digital memeory devices such as time-setting mechanism 39 usefulness ROM and digital switch keeps data signal T BStored count device 411 is removed count value so far after pressing firing switch 7, begin to count the clock signal C LOCK of regulation, and digital comparator 412 is at the count value T of stored count device 411 AThe setting-up time T that has surpassed regulation BThe time, owing to firing switch 7 is pressed, so with Philips's flop-over circuit 413 set that are eliminated.Therefore, the setting-up time T of the regulation of time set 40 after firing switch 7 is pressed BBe control voltage setting device 5 during Philips's flop-over circuit 413 is eliminated, with the reference voltage Δ V of regulation TThe voltage that remains below the output voltage of AC amplifier 4 is supply voltage E.
Figure 28 forbids promptly that with ＂ with anti-phase control input end and ＂ gate circuit gating circuit 414 replaces the circuit diagram of the Philips's flop-over circuit 413 among Figure 27, as the count value T of stored count device 411 AThe setting-up time T that has surpassed regulation BThe time, comparator 412 is forbidden stopping and keeping the counting of stored count device 411 to stored count device 411 input clock signal CLOCK by forbidding gating circuit 414.Digital comparator 412 is directly controlled voltage setting device 5, the setting-up time T of the regulation after firing switch 7 is pressed BInterior with reference voltage Δ V TRemain on supply voltage E.
Figure 29 represents the digital comparator among Figure 28 is removed the time set 40 that the back constitutes, and stored count device 411 is the setting-up time T of time-setting mechanism 39 among the figure BInitial value when firing switch 7 is pressed is taken into and carries out countdown, the signal BO that gives up the throne of the content of utilizing stored count device 411 output when zero count reduces, forbid stopping and keeping the counting of stored count device 411 by forbidding gating circuit 414 to stored count device 411 input clock signal CLOCK.Stored count device 411 utilizes the signal BO that gives up the throne directly to control voltage setting device 5, the setting-up time T of the regulation after firing switch 7 is pressed BInterior with reference voltage Δ V TRemain on supply voltage E.
Figure 30 sets the stored count device 411 among Figure 29 the setting-up time T to time-setting mechanism 39 for BThe data signal that carries out inverting be that complement code is taken into as initial value and increases progressively counting, the carry signal CO of output when stored count device 411 utilizes meter full, forbid to stored count device 411 input clock signal CLOCK by forbidding gating circuit 414, stop and keeping the counting of stored count device 411, utilize carry signal CO control voltage setting device 5 simultaneously, the setting-up time T of the regulation after firing switch 7 is pressed BIn reference voltage Δ VT is remained on supply voltage E.
Complement code is the sign indicating number that 2 system data 0,1 is carried out inverting, so completely be worth and be T if establish the meter of stored count device 411 F, setting-up time T then BComplement code be (T F-T B), so with the initial value of stored count device 411 as setting-up time T BComplement code (T F-T B), make stored count device 411 increase progressively counting, reach meter and completely be worth T FNeeded count value is T B, do not produce countdown among Figure 29 and the difference between the count number.
As mentioned above, even the 40 simulated time measurement mechanisms of the time set among the embodiment 2, but also can constitute with digital counting device, digital counting device both can increase progressively counting, also can carry out countdown, and its structure can be selected arbitrarily.Time set 40 among this embodiment is as long as keep the state of regulation in the stipulated time after firing switch 7 is pressed, and after the stipulated time of having passed through after firing switch 7 is pressed, keep state after will the state counter-rotating of regulation, with which type of device constituting so can.
Figure 31 and Figure 32 are the 1st, the 2nd block diagrams that is out of shape of the control device of expression embodiments of the invention 2.
In Figure 31, with using the switching device 41 of analog switch to be arranged between AC amplifier 4 and the comparison means 6, control, after firing switch 7 is pressed, by the fixed stipulated time T of time-setting mechanism 39 by time set 40 BThe output of interior AC amplifier 4 is not transfused to comparison means 6, in Figure 32, switching device 41 is arranged between comparison means 6 and the drive unit 8 the stipulated time T after firing switch 7 is pressed BIn relatively install 6 output and be not transfused to drive unit 8.
In addition, also switching device 41 can be arranged on the input side of AC amplifier 4, make the output voltage V of thermistor element sensor 1 THBe not transfused to AC amplifier 4, this point is clearly, if can forbid time set 40 in the stipulated time after firing switch 7 is pressed is that the AC compounent of the signal of foundation stops control to what microwave generating apparatus 10 carried out in order to the resistance value of thermistor element sensor 1, the structure of control device 9 just can be selected arbitrarily so.
Figure 33 is the circuit diagram that expression replaces another the 1st form of the drive unit in the control device of embodiments of the invention 2, drive unit 8 is made of the 1st relay 803a and the 2nd relay 803b, above-mentioned the 1st relay 803a is controlled by the 1st deferred mount 804 by Philips's flop-over circuit 801, be used to control power supply to cooling fan 11, above-mentioned the 2nd relay 803b is controlled by the 2nd deferred mount 805 by Philips's flop-over circuit 801, is used to control the power supply to microwave generating apparatus 10.
The 1st deferred mount 804 is made of diode and resistance, electric capacity, it only just produces delay at Philips's flop-over circuit 801 when the direction that cooling fan 11 is stopped to control is worked, the 2nd deferred mount 805 is made of diode and resistance, electric capacity, and it only just produces delay during along the direction work of microwave generating apparatus 10 being started control at Philips's flop-over circuit 801.
Figure 34 is the working time figure of the drive unit among explanation Figure 33, the state of (a) expression Philips flop-over circuit 801 among the figure, (b) contacts status of expression the 1st relay 803a, (c) contacts status of expression the 2nd relay 803b.
After firing switch 7 was pressed, Philips's flop-over circuit 801 returned SM set mode from reset mode, and at this moment the 1st relay 803a is at once with the closing of contact, and cooling fan 11 is started working.On the other hand, the 2nd relay 803b through time delay of postponing regulation by the 2nd deferred mount 805 behind the T2 with the closing of contact, microwave generating apparatus 10 beginning heated foods 14.Along with the heating of food 14, emit the gas that contains moisture etc. from food 14, be the signal V of foundation with the resistance value of thermistor element sensor 1 THAC compounent increase, comparison means 6 with the state counter-rotating after, Philips's flop-over circuit 801 is resetted, and the 2nd relay 803b break contact at once at this moment stops microwave generating apparatus 10, heating finishes.On the other hand, the 1st relay 803a stops cooling fan 11 through behind the T1 contact being disconnected the time delay that is postponed regulation by the 1st deferred mount 804.
As mentioned above, can control microwave generating apparatus 10 and cooling fan 11, so that also have the duration of work of cooling fan carrying out front and back between the period of heating by microwave generating apparatus 10.
; because control device 9 is to constitute like this; being about to timing means 40, to set the resistance value of forbidding in stipulated time after firing switch 7 is pressed in order to thermistor element sensor 1 for be that the AC compounent of the signal of foundation is carried out control action to microwave generating apparatus 10; so initial temperature height of food 14; reach fluidized state even begin heating back food 14 at microwave generating apparatus 10; afore mentioned rules in the time microwave generating apparatus 10 do not stop yet, food 14 might reach the superheated state.
Drive unit 8 in the present embodiment just made cooling fan 11 work before the stipulated time of microwave generating apparatus 10 startings, the gas that is trapped in the high temperature in the heating clamber 13 and contains large quantity of moisture is discharged into heating clamber 13 outsides, so the AC compounent that just can be the signal of foundation after microwave generating apparatus 10 startings according to the resistance value with thermistor element sensor 1 is carried out control action to microwave generating apparatus 10, reaches superheat state so can prevent the high food of initial temperature 14.
In addition, drive unit 8 also makes cooling fan 11 work in the stipulated time after microwave generating apparatus 10 stops, the gas that contains large quantity of moisture in the heating clamber 13 is discharged into heating clamber 13 outsides, make food 14 coolings simultaneously, so food 14 was not in fluidized state when food 14 was taken out from heating clamber 13, even use micro-wave oven can prevent that the high-temperature gas that contains large quantity of moisture is trapped in the heating clamber 13 continuously yet.
Therefore, even disconnected the preventing trouble before it happens of erroneous judgement that also food that is caused by the gas that is detained can have been seethed with excitement when using micro-wave oven repeatedly, while can prevent that microwave generating apparatus 10 from stopping back heat-releasing device error and causing high temperature, so have the effect in the life-span that can prolong microwave generating apparatus 10.
Figure 35 is the circuit diagram that expression replaces another the 2nd form of the drive unit in the control device shown in Figure 25, is the example that constitutes the deferred mount 804,805 in the drive unit 8 shown in Figure 33 with digital circuit.Among the figure, the 1st deferred mount 804 is promptly forbidden gating circuit and preestablishes digital value to be T time delay by carrying out the 1st stored count device 811, phase inverter 812, ＂ or the ＂ gate circuit 813 of countdown, the ＂ that anti-phase control input end is arranged and ＂ gate circuit 814 1Time-setting mechanism 815 constitute, the 2nd deferred mount 805 by the 2nd stored count device 821, ＂ and the ＂ gate circuit 822 that carry out countdown, forbid gating circuit 824 and preestablish digital value to be T time delay 2Time-setting mechanism 825 constitute.
In the 1st deferred mount 804, the 1st stored count device 811 has been exported under the state of the signal of giving up the throne after firing switch 7 is pressed, and leaves the state that maintenance before this stops, with T time delay 1Be taken into as initial value, but at this moment Philips's flop-over circuit 801 also is set simultaneously, so forbid that clock signal C LOCK is by ＂ or ＂ gate circuit 813 with forbid that gating circuit 814 is transfused to the 1st stored count device 811, the 1 stored count devices 811 and still stops.Comparison means 6 is with the state counter-rotating, and after Philips's flop-over circuit 801 was reset, clock signal C LOCK was transfused to the 1st stored count device 811, and the beginning countdown is exported the signal BO that gives up the throne when zero count reduces.After exporting the signal BO that gives up the throne, forbid by forbid that gating circuit 814 is by ＂ or ＂ gate circuit 813 input clock signal CLOCK, so the 1st stored count device 811 stops under state that having exported the signal BO that gives up the throne.The 1st relay 803a is because the effect of the signal BO that gives up the throne that has reversed, and 802a is controlled by transistor, so after being pressed from firing switch 7, comparison means 6 is anti-phase, through T time delay 1Before to cooling fan 11 power supplies.
The 2nd stored count device 821 in the 2nd deferred mount 805 is after firing switch 7 is pressed, with T time delay 2Be taken into as initial value, clock signal C LOCK according to the rules begins countdown, exports the signal BO that gives up the throne when zero count reduces.After exporting the signal BO that gives up the throne, forbid by forbidding gating circuit 824 input clock signal CLOCK, so the 2nd stored count device 821 stops under state that having exported the signal BO that gives up the throne.＂ and ＂ gate circuit 822 utilize amassing by the Philips's flop-over circuit after firing switch 7 set 801 and the signal BO that gives up the throne, drive the 2nd relay 803b by transistor 802b, 10 of the microwave generating apparatus of the contact power supply by the 2nd relay 803b are at T time delay that has passed through after being pressed from firing switch 7 2After till beginning to be reset to Philips's flop-over circuit 801 during this period of time in work.
As mentioned above, deferred mount promptly can be the analog integration device, it also can be digital counting device, when explanation time set 40, illustrated, under the situation of digital counting device, promptly can countdown, counting also can progressively increase, perhaps also can constitute with the comparison means resemble the digital comparator, this is clear and definite.
In addition, other embodiment shown in the 1st embodiment is implemented in the 2nd embodiment, also can obtain same effect, this also is clear and definite.
Embodiment 3
Figure 36 is the microwave oven structure figure of embodiments of the invention 3.Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to by voltage setting device 5 predefined reference voltage Δ V TThe comparison means 6 that compares with the output of AC amplifier 4, utilize firing switch 7 reset the back storage keep the rp state of comparison means 6 latch means 41, by the counting of firing switch 7 beginnings the 2nd clock signal C LOCK2 and the time-setting mechanism 39 that stops to count by latch means 41, will be by the result of time-setting mechanism 39 countings as setting-up time T BThe setting-up time T that is taken into and begins by latch means 41 to be undertaken by the 1st clock signal C LOCK1 BCounting time set 40, with the 1st clock signal C LOCK1 frequency division and generate the frequency divider 42 of the 2nd clock signal C LOCK2 and constitute by the drive unit 8 of firing switch 7 and time set 40 control power supplies with outage.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 3 among Figure 32 is described.
After pressing firing switch 7, drive unit 8 is received power supply signal, drives microwave generating apparatus 10 and cooling fan 11.After food reached fluidized state then, comparison means 6 was exported to latch means 41 with power-off signal.Latch means 41 is exported to power-off signal time set 40 and time-setting mechanism 39 again.After time-setting mechanism 39 is received the power supply signal of firing switch 7, measure to the boiling time of receiving the food till the power-off signal by latch means 41, this time that records be multiply by the time expand that draws regulation behind the divide ratio that is determined by frequency divider 42, this time expand is exported to time set 40.Time set 40 begins the time expand that gate time setting device 39 is set after latch means 41 is received power-off signal, after the counting of this time expand finishes, power-off signal is exported to drive unit 8, so from pressing firing switch 7, food reaches fluidized state, comparison means 6 output break point signals begin, process is after the time expand by the regulation of time-setting mechanism 39 settings, so that stop heating, time set 40 can provide and for example make the fluidized state of the food that boils etc. continue to keep the necessary suitable cooking time for power-off signal is exported to drive unit 8.
Figure 37 is the concrete circuit diagram of the control device of embodiments of the invention 3.This circuit is by relay and transistor, single supply operational amplifier A 1～A 3, Philips's flop-over circuit, frequency counter, stored count device, digital comparator, the ＂ with anti-phase control input end and ＂ gate circuit forbid that promptly gating circuit and resistance, electric capacity etc. constitute.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.When the output of AC amplifier 4 than by the fixed reference voltage Δ V of voltage setting device 5 TWhen big, the single supply operational amplifier A 3Comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.Philips's flop-over circuit is that latch means 41 is to constitute like this, promptly when firing switch 7 is pressed, Philips's flop-over circuit is reset, with the set of Philips's flop-over circuit, storage kept the comparative result of comparison means 6 after the output of comparison means 6 was anti-phase.
Time-setting mechanism 39 is removed the content of stored count device 329 after pressing firing switch 7, only during latch means 41 is in reset mode, with stored count device counting by forbidding the 2nd clock signal C LOCK2 of gating circuit 319, set with press firing switch 7 after corresponding time expand T of time till food 14 boilings that are placed in the heating clamber 13 BIn addition, after food 14 boiling the output of AC amplifier 4 greater than reference voltage Δ V T, after 6 anti-phase, the latch means 41 of comparison means is SM set mode, no thoroughfare forbids gating circuit 319 inputs the 2nd clock signal C LOCK2, so stored count device 329 stops counting and keeps count value.The count value of this maintenance is exactly time expand T B
After latch means 41 was set, the stored count device 411 that time set 40 is equipped with inside discharged from reset mode, and the counting that beginning is undertaken by the 1st clock signal C LOCK1 is by the count value T of 412 pairs of these stored count devices 411 of digital comparator AWith time expand T BCompare, work as T AGreater than T BThe time, time set 40 is just exported.
On the other hand, after firing switch 7 is pressed, Philips's flop-over circuit 801 set that drive unit 8 is equipped with inside, 801 of Philips's flop-over circuits that is set are during set, utilize the output of time set 40, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 by industrial power 32.In addition, use frequency divider 42 divide ratio in accordance with regulations that constitutes by frequency counter, obtain the 2nd clock signal C LOCK2 the 1st clock signal C LOCK1 frequency division.Divide ratio with about 1/4～1/5 for well.
Owing to as above constitute control device 9, reach the required time of boiling and multiply by the time expand that obtains after the multiplying power of regulation so can only prolong the food 14 that are placed in the heating clamber 13 heat time heating time, so can provide the fluidized state of a kind of food that can boil etc. to continue to keep the micro-wave oven of necessary suitable cooking time to sening as an envoy to.
Figure 38 is the circuit diagram that expression replaces another form of the time-setting mechanism in the control device shown in Figure 37.The count content that keeps stored count device 329 among the figure with 339 storages of D-TYP Philips flop-over circuit, the structure that the stored count device 329 of counting the 2nd clock signal C LOCK2 is stopped to obtain same effect.
Figure 39 is the circuit diagram that expression replaces optional the 2nd distortion of the time-setting mechanism in the control device shown in Figure 37, Figure 40 is the output characteristic curve figure of the time-setting mechanism among Figure 39, in Figure 39, pressing behind the firing switch 7 is not that stored count device 329 is resetted, but the regulation that after pressing firing switch 7, will provide by the initial value setting device 349 that digital memeory devices such as ROM or digital switch constitute remove initial value T CBe taken into counting the 2nd clock signal C LOCK2 before latch means 41 set.
Owing to be to constitute like this, so the time set value shown in (1) among Figure 40 has skew T shown in (2) when pressing firing switch 7 back stored count devices and resetting CSo the time that arrives boiling can not produce short and the problem that the food that boils can not be boiled fully of the boiling time that is prolonged in short-term yet.
Figure 41, Figure 42 are the optional the 1st, the 2nd circuit diagrams that is out of shape of representing to replace the time set in the control device shown in Figure 37 respectively, and among Figure 41, after latch means 41 set, stored count device 411 will be by the time expand T of time-setting mechanism 39 settings BAs initial value, the countdown that beginning is undertaken by the 1st clock signal C LOCK1, the content of stored count device when zero count reduces with the signal BO accessory drive of exporting 8 of giving up the throne.In Figure 42, after latch means 41 set, stored count device 411 will be by the time expand T of time-setting mechanism 39 settings BAs initial value, the counting that progressively increases that beginning is undertaken by the 1st clock signal C LOCK1, the content of stored count device is used the carry signal CO accessory drive 8 of output when zero count increases.
Utilize such structure, do not use digital comparator 412 also can have same function.In addition, the purpose that inner deferred mount is set is: the time expand T that the time-setting mechanism of determining when the same signal when stored count device 411 utilizes latch means 41 set is taken into latch means 41 set 39 is set BThe time, determining time expand T reliably BAfterwards, make the output of the latch means of desiring to be taken into 41 that a small time delay be arranged.
Embodiment 4
Figure 43 is the microwave oven structure figure of embodiments of the invention 4.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to by voltage setting device 5 predefined reference voltage Δ V TThe predetermined heating time T is determined in the comparison means 6 that compares with the output of AC amplifier 4, the output of weight sensor 43 that is placed on the weight of the food 14 in the heating clamber 13 by measurement BTime-setting mechanism 39, press and begin T heat time heating time that undertaken by the 1st clock signal C LOCK1 behind the firing switch 7 BCounting time set 40, firing switch 7 and constitute by time set 40 and comparison means 6 control power supplies drive unit 8 with outage.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Food 14 is placed in the food bowl 20, and weight sensor 43 is connected with food bowl 20.
The occupation efficiency of the frequency that weight sensor 43 outputs are corresponding with weight is the pulse output of 50% (pulse rise time and pulse fall time equate).
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 4 among Figure 43 is described.
After pressing firing switch 7, drive unit 8 is received power supply signal, drives microwave generating apparatus 10 and cooling fan 11.After food reaches fluidized state then, be the signal V of foundation with the resistance value of thermistor element sensor 1 THAC compounent increase, comparison means 6 is exported to drive unit 8 with power-off signal, stops heating.On the other hand, when the corresponding predetermined heating time T of setting by time-setting mechanism 39 of weight that record with weight sensor 43 BAfter the end, time set 40 is exported to drive unit 8 with power-off signal, so drive unit 8 is at boiling detection of being undertaken by thermistor element sensor 1 and T heat time heating time that is undertaken by weight sensor 43 BMoment of arriving at first among both of the detection of process stop heating.Therefore, under the big situation of the weight of food 14, can not produce owing to cause superheated evening and with phenomenons such as food 14 dryout by thermistor element sensor 1 detected boiling time.
Figure 44 is the concrete circuit diagram of the control device 9 of embodiments of the invention 4.Figure 45 is
The output characteristic curve figure of the time-setting mechanism 39 in the control device shown in Figure 44, the setting-up time T that expression is obtained by time-setting mechanism 39 BWith the food weight corresponding characteristics.Control device 9 is by relay and transistor, single supply operational amplifier A 1～A 3, Philips's flop-over circuit, ＂ or ＂ gate circuit, stored count device, digital comparator, D-TYP Philips flop-over circuit and resistance, electric capacity etc. constitute.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.When the output of AC amplifier 4 than by the fixed reference voltage Δ V of voltage setting device 5 TWhen big, the single supply operational amplifier A 3Comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.
In order to obtain T heat time heating time shown in Figure 45 BWith the weight corresponding characteristics of food, time-setting mechanism 39 is to constitute like this, promptly is provided with stored count device 329, when the pulse output of weight sensor 43 is risen, from the initial value setting device 349 that constitutes by digital memeory devices such as ROM with initial value T CBe taken into, when the pulse output of weight sensor 43 descends, by the clock signal C LOCK2 of stored count device 329 counting regulations.When the pulse output of weight sensor 43 is risen once more, keep the content of stored count device 329 with 339 storages of D-TYP Philips flop-over circuit.In addition, heat time heating time T BClimbing reach 30～40 seconds with every 100g and be advisable.When pressing firing switch 7, the storage of time set 40 usefulness D-TYP Philips flop-over circuits 413 keeps by the fixed setting-up time T of time-setting mechanism 39 B, simultaneously the stored count device 411 that is provided with by inside carries out the time counting that undertaken by clock signal CLOCK1, with the content T of 412 pairs of these stored count devices 411 of digital comparator ASetting-up time T with storage maintenance in the D-TYP Philips flop-over circuit 413 BCompare, work as T ASurpass T BIn time, just export.
Drive unit 8 is to constitute like this, be after firing switch 7 is pressed, Philips's flop-over circuit 801 that inside is provided with is set, from comparison means 6 by ＂ or ＂ gate circuit in the 806 anti-phase times that begin to time set 40 outputs, to make till Philips's flop-over circuit 801 resets, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 from industrial power 32.
Therefore, 9 of control device are according to by the fixed predetermined heating time T of weight sensor 43 B Microwave generating apparatus 10 is stopped before the control, is that the size of AC compounent of the signal of foundation stops control to microwave generating apparatus 10 according to the resistance value with thermistor element sensor 1.
Figure 46 is the performance diagram of heat time heating time of the work of the control device of explanation among Figure 44.Among the figure, with O 2For the straight line C of initial point represents the characteristic of the heat time heating time corresponding with the food weight of being measured by weight sensor 43 shown in Figure 45, with O 1For the straight line A of initial point represents the boiling corresponding with food weight needed heat time heating time.
Intersection point P 1Expression can be with the maximum weight roughly of micro-wave oven heating, at intersection point P 1Below why straight line C is above straight line, is because it is not certain containing the weight of the various containers of food, so had to add the weight of upper container in the lightweight scope of food by the food weight of weight sensor 43 measurements.
If because heat time heating time is short, when the temperature in the heating clamber 13 is not high, in the little scope of the weight of food, the testing result of the food boiling of being undertaken by thermistor element sensor 1 is consistent with the boiling of food needed heat time heating time haply, if but the weight of food is big, heat time heating time is elongated, and when the temperature in the heating clamber 13 uprised, the testing result that the food that is undertaken by thermistor element sensor 1 seethes with excitement began generation time and lags behind.
Therefore, the weight with food that is detected by thermistor element sensor 1 becomes with O corresponding heat time heating time 1Be the curve B of initial point, in the big scope of the weight of food, can produce problems such as drying owing to the over-heating of food.
, as described in the 4th embodiment, if only use according to by the fixed predetermined heating time T of weight sensor 43 BTo microwave generating apparatus 10 stop control before, be the control device 9 that the size of AC compounent of the signal of foundation stops to control to microwave generating apparatus 10 just according to resistance value with thermistor element sensor 1, then in the lightweight scope of food, the rule of heat time heating time obeying curve B corresponding with the weight of food, after the weight of food increases, the intersection point P of curve B and straight line C 2Below obey the rule of straight line C, so can not leave boiling needed heat time heating time of food the heat time heating time corresponding with the weight of food is that straight line A is far, therefore can provide a kind of easy-to-use micro-wave oven that can not produce drying etc. owing to the over-heating of food.
Figure 47 is the circuit diagram that expression replaces optional the 1st distortion of the time-setting mechanism in the control device shown in Figure 44, stored count device 329 output pulse of counter weight sensor 43 between the clock signal C LOCK2 decrement phase of regulation has the function same with time-setting mechanism shown in Figure 44 39.
Figure 48 is the circuit diagram that expression replaces optional the 2nd distortion of the time-setting mechanism in the control device shown in Figure 44, the output pulse of weight sensor 43 is imported in the 2nd stored count device 359 of the counting that progressively increases, between the carry signal CO decrement phase of the 2nd stored count device 359, the 1st stored count device 329 counting clock signal CLOCK2.
Figure 49 is the working time figure of the time-setting mechanism among explanation Figure 48, and the 2nd stored count device 359 is 2 bit architectures.
In Figure 49, after the output pulse input of weight sensor 43, the 2nd stored count device 359 is corresponding to progressively increase 1,2 content of each umber of pulse, output carry signal CO between the next one output pulse decrement phase of the weight sensor 43 that is reaching meter full (content is 3).Therefore, be not subject to the influence of variation of the output pulse of weight sensor 43, the counting quantitative change of clock signal C LOCK2 simultaneously is many, therefore can improve by the fixed setting-up time T of weight sensor 43 BSetting accuracy.
Figure 50, Figure 51 are the optional the 1st, the 2nd circuit diagrams that is out of shape of representing to replace the time set in the control device shown in Figure 44 respectively, divide expression in addition without the digital comparator 412 that uses among Figure 44, but with stored count device 411 from initial value countdown clock signal CLOCK1, export the signal BO that gives up the throne, and with stored count device 411 from the initial value counting clock signal CLOCK1 that progressively increases, output carry signal CO.
In fact time set 40 shown in Figure 50, Figure 51 has the function same with time set shown in Figure 44 40.
Embodiment 5
Figure 52 is the microwave oven structure figure of embodiments of the invention 5.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, by integrator acquisition voltage V THDC component and preestablish the reference voltage Δ V of regulation T Voltage setting device 5, to said reference voltage Δ V TThe comparison means 6 that compares with the output of AC amplifier 4 and constitute by the drive unit 8 of comparison means 6 and firing switch 7 control power supplies and outage.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 5 among Figure 52 is described.
Follow the rising of thermistor element sensor 1 temperature, with the output voltage V of thermistor element sensor 1 THThe output voltage of the AC amplifier 4 that amplifies of AC compounent reduce, but voltage setting device 5 is set the reference voltage Δ V that is in proportion with AC compounent according to the DC component from integrator 44 TSo, with output voltage and the reference voltage Δ V of relative same level to the AC amplifier 4 after the AC compounent of thermistor element sensor 1 is amplified TCompare, the judgement of comparison means 6 is postponed constantly, can irrespectively stably detect the boiling of food with the temperature in the heating clamber 13, can be with the food over-heating.
Figure 53 is the concrete circuit diagram of control device 9 of the micro-wave oven of embodiments of the invention 5, and Figure 54 is the output characteristic curve figure of the voltage setting device 5 in the control device shown in Figure 53, the reference voltage Δ V that expression is set with voltage setting device 5 T
In Figure 53, control device 9 is by relay and transistor, single supply operational amplifier A 1～A 5, Philips's flop-over circuit and resistance, electric capacity is formed by combining.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.When the output of AC amplifier 4 than by the fixed reference voltage Δ V of voltage setting device 5 TWhen big, the single supply operational amplifier A 3Comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.
With integrator 44 with voltage V THThe V of AC compounent after removing THDC component input voltage setting device 5, voltage setting device 5 utilizes the single supply operational amplifier A by making 1, A 2The high buffer amplifier of input impedance and have bias voltage V BThe combination of anti-phase enlarging section, have shown in Figure 54 and V THThe output characteristics that is inversely proportional to.
After firing switch 7 is pressed, Philips's flop-over circuit 801 set that drive unit 8 is equipped with inside, anti-phase to comparison means 6 and till Philips's flop-over circuit 801 is resetted during, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 by industrial power 32.
Because voltage V THBe to use corresponding resistance value and 3 couples of DC reference voltage E of resistance that determine to carry out voltage after partial, so voltage V with the temperature of thermistor element sensor 1 THBe and the proportional voltage of the temperature of thermistor element sensor 1, so proportional with near the temperature of air the thermistor element sensor 1.
; in Figure 16 of embodiment 1, illustrated; such phenomenon is arranged; the temperature that is the thermistor element sensor 1 that rises with the rising of following the air themperature in the heating clamber 13 of the size of the AC compounent of water when boiling thermistor element sensor 1 is inversely proportional to, if but will follow the rising of temperature of thermistor element sensor 1 like this with comparison means 6 and the size of the AC compounent of the thermistor element sensor 1 that reduces and the reference voltage Δ V of certain value TCompare, then the rising along with thermistor element sensor 1 temperature postpones the anti-phase moment of comparison means 6, has probably just inferred easily.
Voltage setting device 5 in the control device 9 of embodiment 5 utilizes voltage V THDC component determine and voltage V THThe reference voltage Δ V that is inversely proportional to TSo, voltage V during the rising of the temperature of thermistor element sensor 1 THEven the size of AC compounent reduce, also can be relatively with same level (the voltage V during the water boiling for example TH AC compounent size 1/5) to voltage V THThe size of AC compounent compare and distinguish that the anti-phase moment of comparison means 6 does not produce delay, therefore having can be with the superheated effect of food.
By the fixed reference voltage Δ V of voltage setting device 5 TNot necessarily must be linear function as shown in the Examples, voltage V THAC compounent size also can with the state consistency that reduces along with the rising of temperature, also can have log characteristic.
Embodiment 6
Figure 55 is the microwave oven structure figure of embodiments of the invention 6.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to by the 1st voltage setting device 5 predefined reference voltage Δ V TThe 1st comparison means 6 that compares with the output of AC amplifier 4, above-mentioned voltage V to obtaining by integrator 44 THDC component and by i.e. the 2nd voltage setting device 45 predefined high temperature reference voltage Δ V of high temperature voltage setting device TThe 2nd comparison means 46 that compares and drive unit 8 formations of controlling the input of firing switch 7, powering and cut off the power supply by firing switch 7 and 6 controls of the 1st comparison means simultaneously according to the output of the 2nd comparison means 46.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 6 among Figure 55 is described.
When heating clamber 13 is in common state, press firing switch 7, power supply signal is fed to drive unit 8, begins heating, as the output of the AC amplifier 4 reference voltage Δ V than the 1st voltage setting device TWhen big, the 1st comparison means 6 is exported to drive unit 8 with power-off signal, stops heating, but heating clamber 13 is when being in the condition of high temperature, but the voltage ratio high temperature reference voltage Δ V of the DC component of integrator 44 TGreatly, initiating signal is forbidden in 46 outputs of high temperature comparison means, drive unit 8 receive from high temperature comparison means 46 forbid initiating signal after, because it is invalid to make from the power supply signal of the firing switch 7 that begins to power to microwave generating apparatus 10 and cooling fan 11, so the automatic running that can stop micro-wave oven to carry out according to the AC compounent that with the resistance value of thermistor element sensor 1 is foundation begins, and can will prevent trouble before it happens because of heating causes the drying of food surface or underheat in the high-temperature atmosphere.
Receive from the forbidding after the initiating signal of high temperature comparison means 46 at drive unit 8,, also forbid to microwave generating apparatus 10 and cooling fan 11 power supplies even receive the power supply signal of firing switch 7.Receive after the power supply signal of firing switch 7,, also continue to microwave generating apparatus 10 power supplies such as grade even receive the initiating signal of forbidding from high temperature comparison means 46.
Figure 56 is the physical circuit figure of control device 9 of the micro-wave oven of the embodiment of the invention 6.Control device 9 is by relay or transistor, single supply operational amplifier A among the figure 1～A 4, Philips's flop-over circuit, ＂ and ＂ gate circuit, the ＂ with anti-phase control input end and ＂ gate circuit promptly forbid gating circuit, be formed by combining as the buzzer of notifying device and resistance, electric capacity.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.When the output of AC amplifier 4 than by the fixed reference voltage Δ V of the 1st voltage setting device 5 TWhen big, the single supply operational amplifier A 3The 1st comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.As the voltage V that obtains by integrator 44 THDC component than by the 2nd voltage setting device 45 predefined reference voltage Δ V TWhen big, the single supply operational amplifier A 4The 2nd comparison means 46 with the single supply operational amplifier A 4Output state counter-rotating.
The gating circuit 806 of forbidding that drive unit 8 is controlled by the output that utilizes the 2nd comparison means 46 obtains the signal of firing switch 7, make 801 set of Philips's flop-over circuit, the 1st comparison means 6 is anti-phase, during till resetting to Philips's flop-over circuit 801, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 by industrial power 32.
, when the 2nd comparison means 46 was anti-phase, even push firing switch 7, the 801 yet not set of Philips's flop-over circuit were not so drive unit 8 drives microwave generating apparatus 10.
In addition, it is buzzer that drive unit 8 drives notifying devices 808 by ＂ and ＂ gate circuit 807 by the 2nd comparison means 46 and firing switch 7, so have only when the 2nd comparison means 46 is anti-phase by behind the firing switch 7, just makes notifying device 808 carry out notification action.
After using continuously a large amount of food of micro-wave oven heating, the state that often reaches a high temperature of the air in heating clamber 13 and the heating clamber 13.In such micro-wave oven during heated food, food is not only used heating using microwave, but also by the wall width of cloth of heating clamber 13 penetrate with heating clamber 13 in the heat conduction of air heat, so the temperature of food surface reaches boiling point earlier than food temperature inside, a large amount of water vapours evaporate from food surface, can make the food surface drying, just detect the fluidized state of food surface, exist the problem that under the low state of food temperature inside, has just stopped heating.
Thermistor element sensor 1 also is in the condition of high temperature in the control device 9 of embodiment 6 because when heating clamber 13 is in the condition of high temperature, so voltage V THReach higher value, not needing just can be when heating clamber 13 reaches a high temperature state with other temperature sensor, by the resistance value with thermistor element sensor 1 is the AC compounent prevention micro-wave oven beginning of running automatically of the signal of foundation, the drying and the underheat of food surface can be prevented trouble before it happens.
In addition,,, notify user's micro-wave oven state that reached a high temperature, can indicate and to re-use after the micro-wave oven cooling just notifying device 808 is worked if heating clamber 13 is pressed firing switch 7 when reaching a high temperature state.
Embodiment 7
Figure 57 is the microwave oven structure figure of embodiments of the invention 7.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandle by control device 9, control device 9 by the AC amplifier 4 that AC compounent is amplified, to by the 1st voltage setting device 5 according to the i.e. predefined reference voltage Δ of the output V of the 2nd comparison means 46 of high temperature comparison means TThe 1st comparison means 6 that compares with the output of AC amplifier 4, to by with voltage V THThe voltage V that obtains of the integrator 44 removed of AC compounent THDC component and by i.e. the 2nd voltage setting device 45 predefined reference voltage Δ V of high temperature voltage setting device TThe predetermined heating time T is determined in the 2nd comparison means 46 that compares, the output of weight sensor 43 that is placed on the weight of the food 14 in the heating clamber 13 according to measurement BTime-setting mechanism 39, begin to carry out T heat time heating time after pressing firing switch 7 by the 1st clock signal BCounting time set 40 and constitute by the drive unit 8 of firing switch 7 and time set 40 and 6 control power supplies of the 1st comparison means and outage.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Food 14 is placed in the food bowl 20, and weight sensor 43 is connected with food bowl 20.
The occupation efficiency of the frequency that weight sensor 43 outputs are corresponding with weight is the pulse output of 50% (pulse rise time and pulse fall time equate).
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 7 among Figure 57 is described.
When heating clamber 13 is in common state, as the output of AC amplifier 4 reference voltage Δ V than the 1st voltage setting device TWhen big, the 1st comparison means 6 is exported to drive unit 8 with power-off signal, stops heating.In addition, as described in embodiment 4, time set 40 will be given drive unit 8 by the boiling detection information that thermistor element sensor 1 carries out earlier, also power-off signal be exported to drive unit 8 certainly.
When heating clamber 13 is in high temperature range, be the signal V of foundation with the resistance value of thermistor element sensor 1 THAC compounent be subjected to thermal noise and only increase from the influence of food surface moisture evaporated, so before food all seethes with excitement, can predicate mistakenly and reach fluidized state, thereby the underheat of causing, but at this moment the 2nd comparison means is that high temperature comparison means 46 is concluded the signal V that obtains by integrator 44 THThe size of DC component than high temperature reference voltage Δ V TGreatly, after switching signal exported to the 1st voltage setting device 5, the 1 voltage setting devices 5 and receive switching signal from high temperature comparison means 46, with reference voltage Δ V TSwitch to the maximum output of the AC amplifier 4 the fluidized state under supply voltage more than big or small from the setting voltage of regulation, so from the 1st comparison means 6 output power-off signals, by the time-setting mechanism 39 corresponding predetermined heating time T of measuring with weight sensor 43 of weight that set BAfter the end, time set 40 is exported to drive unit 8 with power-off signal, so can be in the corresponding predetermined heating time T of measuring with weight sensor 43 of weight BHeating food article turns round even be under the condition of high temperature in heating clamber 13, also can not cause food underheat and running automatically.
Figure 58 is the concrete circuit diagram of control device 9 of the micro-wave oven of embodiments of the invention 7.By relay and transistor, single supply operational amplifier A 1～A 4, Philips's flop-over circuit, ＂ or ＂ gate circuit, stored count device, digital comparator, D-TYP Philips flop-over circuit and resistance, electric capacity etc. constitute.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.When the output of AC amplifier 4 than by the fixed reference voltage Δ V of the 1st voltage setting device 5 TWhen big, the single supply operational amplifier A 3The 1st comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.As the voltage V that obtains by integrator 44 THDC component than by i.e. the 2nd voltage setting device 45 predefined reference voltage Δ V of high temperature voltage setting device TWhen big, the high temperature comparison means is that the 2nd comparison means 46 is with the single supply operational amplifier A 4Output state counter-rotating.
The anti-phase direction of the 2nd comparison means 46 is opposite with the anti-phase direction of the 1st comparison means 6.
When the 1st voltage setting device 5 is rp state at the 2nd comparison means 46, by the transistor turns power supply, with supply voltage E as reference voltage Δ V TSo, to the output of the AC amplifier 4 that do not reach supply voltage E with by the fixed reference voltage Δ V of the 1st voltage setting device 5 TThe 1st comparison means 6 that compares is not anti-phase during the 2nd comparison means 46 is rp state.
Time-setting mechanism 39 is provided with stored count device 329, when the pulse of weight sensor 43 output is risen, from the initial value setting device 349 that constitutes by digital memeory devices such as ROM with initial value T CBe taken into, when the pulse output of weight sensor 43 descends, by the clock signal C LOCK2 of stored count device 329 counting regulations.When the pulse output of weight sensor 43 is risen once more, with the content of D-TYP Philips flop-over circuit 339 storage maintenance stored count devices 329, as setting-up time T BLike this, time-setting mechanism 39 provides about 30 seconds skew corresponding to the weight of food 14, can obtain to have the output characteristics that every 100g reaches 30～40 seconds climbing.
When pressing firing switch 7, the inner D-TYP Philips flop-over circuit that is provided with 413 storages of time set 40 usefulness keep by the fixed setting-up time T of time-setting mechanism 39 B, the content of the stored count device 411 that simultaneously inside is provided with is removed, and restarts to carry out time counting by clock signal CLOCK1, with the content T of 412 pairs of these stored count devices 411 of digital comparator ASetting-up time T with storage maintenance in the D-TYP Philips flop-over circuit 413 BCompare, work as T ASurpass T BIn time, just export.
Drive unit 8 is to constitute like this, be after firing switch 7 is pressed, Philips's flop-over circuit 801 that inside is provided with is set, in the output of output that utilizes the comparison means 6 by ＂ or 806 inputs of ＂ gate circuit and time set 40 any one make Philips's flop-over circuit 801 Philips's flop-over circuit 801 be in SM set mode before resetting during, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 from industrial power 32.
Therefore, 9 of control device are according to by the fixed predetermined heating time T of weight sensor 43 BTo microwave generating apparatus 10 stop control before, be that the size of AC compounent of the signal of foundation stops control to microwave generating apparatus 10 just according to resistance value with thermistor element sensor 1, and when the resistance value with thermistor element sensor 1 be the size of DC component of the signal of foundation when surpassing setting, forbid according to resistance value being that the size of AC compounent of the signal of foundation stops control to microwave generating apparatus 10 with thermistor element sensor 1.
Figure 59 is the heat time heating time and the temperature characteristics figure of work of the control device 9 of explanation embodiment 7.A is that expression does not vary with temperature by the characteristic curve of the heat time heating time of weight sensor 43 settings among the figure.B is to be the size control characteristic curve during heat time heating time of AC compounent of the signal of foundation by the resistance value with thermistor element sensor 1, and the temperature in the expression heating clamber 13 rise and the boiling of food 14 detects delay.C is illustrated in the scope of higher temperature, because with the resistance value of thermistor element sensor 1 is that the AC compounent of the signal of foundation is subjected to thermal noise and only increases from the influence of food surface moisture evaporated, so all can predicate the situation that has reached fluidized state mistakenly before the boiling at food.
If the temperature that characteristic curve A and characteristic curve B intersect is T 1, the temperature that characteristic curve A and characteristic curve C intersect is T 2
Therefore, according to by the fixed predetermined heating time T of weight sensor 43 BWith resistance value with thermistor element sensor 1 be the size of AC compounent of the signal of foundation in heat time heating time of determining the shorter one determined to follow the rising of temperature under the situation of heat time heating time, reaching temperature T 1Before, obey characteristic curve B heat time heating time, in temperature T 1And temperature T 2Between, obey characteristic curve A, in temperature T 2When above, obey characteristic curve C, as can be known the underheat of food 14.
; in the control device 9 of present embodiment; when the resistance value with thermistor element sensor 1 is that the DC component (this is equivalent to the temperature of thermistor element sensor 1) of the signal of foundation is when having surpassed setting; forbid microwave generating apparatus 10 being stopped control, if therefore the afore mentioned rules value is fixed on the temperature T that is equivalent among Figure 59 according to the size of AC compounent that with the resistance value of thermistor element sensor 1 is the signal of foundation 1And temperature T 2Between temperature T 3, then the temperature when thermistor element sensor 1 compares temperature T in Figure 59 1Obey characteristic curve B when low, if compare temperature T 1Height is then obeyed characteristic curve A, so the underheat of the food 14 can not cause heating clamber 13 in high temperature range the time.
Figure 60, Figure 61 are the optional the 1st, the 2nd block diagrams that is out of shape of representing the control device of embodiment 7 respectively.
In Figure 60, to insert between AC amplifiers 4 and the 1st comparison means 6 by the switching device 41 that analog switch etc. constitutes, with the 2nd comparison means 46 gauge tap devices, in Figure 61, to insert between the 1st comparison means 6 and the drive unit 8 by the switching device 41 that analog switch etc. constitutes, with the 2nd comparison means 46 gauge tap devices, under above-mentioned any situation, when the resistance value with thermistor element sensor 1 is that the size of DC component of the signal of foundation is when surpassing setting, all forbid the action that 6 pairs of microwave generating apparatus 10 of the 1st comparison means stop to control, can obtain effect similarly to Example 7.
In addition, switching device 41 can certainly be located at the input side of AC amplifier 4, stop the output voltage V of thermistor element sensor 1 THBe transfused to AC amplifier 4, also can obtain same effect.
Embodiment 8
Figure 62 is the microwave oven structure figure of embodiments of the invention 8.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by control device 9, control device 9 is by the AC amplifier 4 that AC compounent is amplified, to the reference voltage Δ V by 5 settings of the 1st voltage setting device TThe 1st comparison means 6 that compares with the output of AC amplifier 4, to by with voltage V THThe voltage V that obtains of the integrator 44 removed of AC compounent THDC component and by i.e. the 2nd voltage setting device 45 predefined reference voltage Δ V of room temperature voltage setting device TThe room temperature comparison means that compares promptly the 2nd comparison means 46, be placed on according to measurement the food 14 in the heating clamber 13 weight weight sensor 43 output and determine the predetermined heating time T according to the output state of the 2nd comparison means 46 simultaneously BTime-setting mechanism 39, begin to carry out T heat time heating time after pressing firing switch 7 by the 1st clock signal BCounting time set 40 and constitute by the drive unit 8 of firing switch 7 and time set 40 and 6 control power supplies of the 1st comparison means and outage.
Power supply and outage that control device 9 control is carried out microwave generating apparatus 10 and cooling fan 11.
Food 14 is placed in the food bowl 20, and weight sensor 43 is connected with food bowl 20.
The occupation efficiency of the frequency that weight sensor 43 outputs are corresponding with weight is the pulse output of 50% (pulse rise time and pulse fall time equate).
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 8 among Figure 62 is described.
When heating clamber 13 was in common state, when reference voltage that the voltage of AC amplifier 4 is set greater than the 1st voltage setting device 5, the 1st comparison means 6 was exported to drive unit 8 with power-off signal, stops heating.In addition, as described in embodiment 4, time set 40 will be given drive unit 8 by the boiling detection information that thermistor element sensor 1 carries out earlier, also power-off signal be exported to drive unit 8 certainly.
When heating clamber 13 is in a certain given room temperature, as the voltage V that obtains by integrator 44 THThe size of DC component than the reference voltage Δ V that sets by room temperature voltage setting device 45 THWhen big, room temperature comparison means 46 is exported to time-setting mechanism 39 with switching signal, and time-setting mechanism 39 is according to the temperature in the heating clamber, and change is by fixed T heat time heating time of weight sensor 43 B, with this T heat time heating time after changing BHeating, after finishing this heat time heating time, time set 40 is exported to drive unit 8 with power-off signal.Even therefore the temperature in the heating clamber 13 rises, also can be with the food over-heating.
Figure 63 is the concrete circuit diagram of control device 9 of the micro-wave oven of embodiments of the invention 8.By relay and transistor, single supply operational amplifier A 1～A 4, Philips's flop-over circuit, ＂ or ＂ gate circuit, stored count device, digital comparator, D-TYP Philips flop-over circuit, switching device and resistance, electric capacity etc. constitute.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.
When the output of AC amplifier 4 than by the fixed reference voltage Δ V of the 1st voltage setting device 5 TWhen big, the single supply operational amplifier A 3The 1st comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.
As the voltage V that obtains by integrator 44 THDC component than by the 2nd voltage setting device 45 predefined reference voltage Δ V TWhen big, the 2nd comparison means 46 is with the single supply operational amplifier A 4Output state counter-rotating.
Time-setting mechanism 39 is to constitute like this, promptly when the pulse output of weight sensor 43 is risen, corresponding with the output state of the 2nd comparison means 46, use the switching device 351 that constitutes by channel selectivity circuit to select the 1st and the 2nd initial value setting device 349 that constitutes by digital memeory devices such as ROM, 350 one among both, initial value as stored count device 329 is taken into, between the pulse output decrement phase of weight sensor 43, corresponding with the output state of the 2nd comparison means 46, the 2nd clock signal C LOCK2 that selects by above-mentioned switching device 351 by stored count device 329 counting and the 3rd clock signal C LOCK3 one among both, when the pulse output of weight sensor 43 is risen once more, with the content of D-TYP Philips flop-over circuit 339 storage maintenance stored count devices 329, as setting-up time TB.
When pressing firing switch 7, time set 40 will be by the fixed setting-up time T of time-setting mechanism 39 BStorage remains in the D-TYP Philips flop-over circuit 413, simultaneously the content of stored count device 411 is removed, and restarts to carry out time counting by clock signal CLOCK1, with the content T of 412 pairs of these stored count devices 411 of digital comparator ASetting-up time T with storage maintenance in the D-TYP Philips flop-over circuit 413 BCompare, work as T ASurpass T BIn time, just export.
Drive unit 8 is to constitute like this, be after firing switch 7 is pressed, Philips's flop-over circuit 801 that inside is provided with is set, in the output of output that utilizes the comparison means 6 by ＂ or 806 inputs of ＂ gate circuit and time set 40 any one make Philips's flop-over circuit 801 Philips's flop-over circuit 801 be in SM set mode before resetting during, by the contact of transistor 802 driving relays 803, power to microwave generating apparatus 10 and cooling fan 11 from industrial power 32.
The resistance value of thermistor element sensor 1 is the signal V of foundation THDC component be the relevant signal of mean temperature with the allocation position of thermistor element sensor 1, so also relevant with the temperature in the heating clamber 13.
Figure 64 is the output characteristic curve figure of the time-setting mechanism in the control device shown in Figure 63.
2 kinds of fixed setting-up time Ts corresponding of the time-setting mechanism 40 by embodiment 8 shown in Figure 64 with food weight BCharacteristic curve C 1, C 2Be equivalent to press the temperature of firing switch 7 back heating clambers 13 respectively when low and the setting-up time T that provides when high of the temperature of heating clamber 13 BAnd the characteristic curve that concerns between the food weight.
Therefore, 9 of the control device of embodiment 8 are at T heat time heating time through determining corresponding to the thermometric result of heating clamber 13 according to weight sensor 43 B, microwave generating apparatus 10 is stopped before the control, be that the size of AC compounent of the signal of foundation stops control to microwave generating apparatus 10 just according to resistance value with thermistor element sensor 1.
Figure 65 is the heat time heating time performance diagram corresponding with food weight of the work of the control device shown in explanation Figure 63.
Food 14 is in heating clamber 13 during by microwave generating apparatus 10 heating, if the temperature height of the air in the wall of heating clamber 13 and the heating clamber 13, then food 14 not only is heated owing to absorbing microwave, but also by penetrate from the wall width of cloth of heating clamber 13 with heating clamber 13 in the heat conduction of air heat, as can be known with heating clamber 13 in temperature compare when low, food 14 can seethe with excitement in short heat time heating time.The characteristic curve of representing this state be among Figure 65 with O 1Straight line A for initial point 1With with O 3Straight line A for initial point 2, represent when temperature in the heating clamber 13 are low respectively and the temperature in the heating clamber 13 when high the food corresponding with the weight of food seethe with excitement needed heat time heating time.
Secondly, with O 2Straight line C for initial point 1With with O 4Straight line C for initial point 2, represent when temperature in the heating clamber 13 shown in Figure 64 are low respectively and temperature when high measurement result with weight sensor 43 be the setting-up time of foundation.
Curve B 1And curve B 2Represent when temperature in the heating clamber 13 are low respectively and the heat time heating time of temperature when being the AC compounent control microwave generating apparatus 10 of signal of foundation when high according to resistance value with thermistor element sensor 1.
Therefore, when the temperature in the heating clamber 13 is low, the heat time heating time during with the control device 9 control microwave generating apparatus 10 of embodiment 8 along with the increase of food weight from an O 1Move on to curve B 1On, with straight line C 1Intersection point P 2Below, move on to straight line C 1On, when the temperature in the heating clamber 13 is high from an O 3Move on to curve B 2On, with straight line C 3Intersection point P 4Below, move on to straight line C 2On, owing to leave the expression straight line A of best heat time heating time 1With straight line A 2Distance is little, so even the temperature in the heating clamber 13 rises, also can not provide easy-to-use microwave road with the food over-heating.
In addition, a plurality of the 2nd setting devices 45 and the 2nd comparison means 46 can also be set, it is accurately corresponding to rise with the temperature in the heating clamber 13, in addition, if the storage in the time set 39 is kept setting-up time T BD-TYP Philips flop-over circuit take out, then can be with the time with microwave generating apparatus 10 heating the temperature in the heating clamber 13 rise correspondingly, can expect more to obtain better effect.
Embodiment 9
Figure 66 is the microwave oven structure figure of embodiments of the invention 9.
Among the figure, carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THHandled by the 1st control device 9, the 1st control device 9 is by the AC amplifier 4 that AC compounent is amplified, to by the 1st voltage setting device 5 predefined reference voltage Δ V TThe 1st comparison means 6 that compares with the output of AC amplifier 4 and the 1st drive unit 8 of the 1st firing switch 7 and 6 control power supplies of the 1st comparison means and some electricity constitute.
Power supply and outage that the control of the 1st control device 9 is carried out microwave generating apparatus 10 and cooling fan 11.
Carry out voltage after partial V with the resistance value of thermistor element sensor 1 and the voltage E of 3 pairs of dc reference power supplys 2 of resistance THAlso handled by the 2nd control device 50, the 2nd control device 50 is by the integrator 44 that AC compounent is removed, to the voltage V through integrator 44 THDC component and by the i.e. temperature reference voltages Δ V that sets of the 2nd voltage setting device 45 of temperature setting device TThe temperature comparison means that compares i.e. the 2nd comparison means 46, setting T heat time heating time BTime-setting mechanism 39, press the stove firing switch and promptly begin to measure T heat time heating time that sets by time-setting mechanism 39 behind the 2nd firing switch 48 BTime set 40 and by the heater driving device of the 2nd firing switch 48 and time set 40 and 46 control power supplies of the 2nd comparison means and outage promptly the 2nd drive unit 49 constitute.
The 2nd control device 50 for example control to the heater heater 51 of heating clamber 13 heating power and cut off the power supply, in the predetermined heating time T BIn make the temperature that keep regulation in the heating clamber 13.
Secondly, the working condition of the micro-wave oven of the embodiments of the invention 9 among Figure 66 is described.
The 1st control device 9 is identical with embodiment 1 among Fig. 1, so its explanation is omitted.The working condition of the 2nd control device 50 is as follows.
Press the 2nd firing switch 48 back outputs the 1st power supply signal, after the 1st power supply signal output of the 2nd firing switch 48, time set 40 begins to measure the heat time heating time of being set by time-setting mechanism 39, at T heat time heating time that is set by time-setting mechanism 39 BDuring in, temperature in heating clamber 13 than and the temperature reference voltages Δ V that sets of the 2nd voltage setting device 45 THWhen suitable temperature was hanged down, the 2nd comparison means 46 outputs the 2nd power supply signal was when surpassing T heat time heating time BThe time, i.e. the 2nd drive unit 49 outputs of time set 40 output power-off signals, heater driving device the 1st power supply signal is when receiving the 2nd power supply signal of the 2nd comparison means 46, to 51 power supplies of heater heater before time set 40 output power-off signals.
Therefore only with a thermistor element sensor 1, heater heating control apparatus 50 just can be at T heat time heating time of setting BDuring in heating clamber 13 is remained on the temperature of regulation, have the function of thermostat, can realize being with the micro-wave oven of heater.
Figure 67, Figure 68 are respectively the 1st control device 9 of the embodiment of the invention 9 and the physical circuit figure of the 2nd control device 50.The 1st control device 9 among Figure 67 is by the 1st relay and transistor Tr 1, Philips's flop-over circuit, single supply operational amplifier A 1～A 3Reaching resistance, electric capacity etc. constitutes.
AC amplifier 4 is by the single supply operational amplifier A of using by 2 power supplies of dc reference power supply 1, A 2Differentiator and integration enlarging section constitute, having the frequency characteristic of about 3.2Hz of centre frequency and the about 3.2Hz of bandwidth and only exporting with respect to earthing potential is the rectification characteristic of positive waveform.
When the output of AC amplifier 4 than by the fixed reference voltage Δ V of the 1st voltage setting device 5 TWhen big, the single supply operational amplifier A 3The 1st comparison means 6 with the single supply operational amplifier A 3Output state counter-rotating.
The 1st drive unit 8 is to constitute like this, promptly after the 1st firing switch 7 is pressed, Philips's flop-over circuit 801a that be equipped with inside is set, anti-phase to the 1st comparison means 6 and till Philips's flop-over circuit 801a is resetted during, by the contact of transistor 802a driving relay 803a, power to microwave generating apparatus 10 and cooling fan 11 by industrial power 32.
Therefore the 1st control device 9 can be controlled micro-wave oven and moves automatically, with microwave generating apparatus 10 heated foods 14, detection is the fluidized state of the AC compounent of the signal of the foundation food 14 when sharply increasing with the resistance value of thermistor element sensor 1, and microwave generating apparatus 10 is stopped.
The 2nd control device 50 among Figure 68 is by the 2nd relay and transistor Tr 2, ＂ and ＂ door Philips flop-over circuit, single supply operational amplifier A 4, constitute by digital switch or the time-setting mechanism that constitutes by digital memeory devices such as digital switch and Philips's flop-over circuits, stored count device, digital comparator and resistance, electric capacity etc.
With the 2nd comparison means 46 is the single supply operational amplifier A 4To the voltage V that obtains by integrator 44 THDC component and the reference voltage Δ V of the 2nd setting device 45 set arbitrarily of user THCompare, as voltage V THDC component than reference voltage Δ V THWhen big, the 2nd comparison means 46 output low level signals are as voltage V THDC component than reference voltage Δ V THHour output high level signal, so reverse.
Time-setting mechanism 39 is set T heat time heating time arbitrarily by the user B, after the 2nd firing switch 48 was pressed, time set 40 was removed the content of stored count device 411, restarts the time counting of clock signal C LOCK, compared T heat time heating time with digital comparator 412 BCount content T with above-mentioned stored count device 411 A, as count content T ASurpass T heat time heating time BIn time, just export.
Philips's flop-over circuit 801b that the 2nd drive unit 49 inside are provided with is by 48 set of the 2nd firing switch, output by time set 40 resets, the output of Philips's flop-over circuit 801b is transfused to ＂ and ＂ gate circuit 805 with the output of the 2nd comparison means 46, ＂ and ＂ gate circuit 805 drive the 2nd relay 803b by transistor 802b, are powered to heater heater 51 by commercial power 32.
Therefore, the 2nd control device 50 is being set T heat time heating time arbitrarily BIn, the resistance value with thermistor element sensor 1 that will be equivalent to the mean temperature of thermistor element sensor 1 is that the size of DC component of the signal of foundation keeps certain, intermittently to 51 power supplies of heater heater.
Because the interior gas temperature of the temperature of thermistor element sensor 1 and heating clamber 13 is relevant, this is clear and definite, so the 2nd control device 50 is at T heat time heating time BGas temperature in the inner control heating clamber 13 makes it keep certain, so constitutes thermostat.
As mentioned above, in embodiments of the invention 9, use a thermistor element sensor 1 that a kind of micro-wave oven that has heater that has the micro-wave oven that can turn round automatically and can control the such two kinds of functions of thermostat of uniform temperature just can be provided at an easy rate.
In addition, by each above-mentioned embodiment is combined, can realize having the micro-wave oven of more performance, this is sure, can select combining form arbitrarily.
Only the invention is characterized in a thermistor element sensor, add faster according to changing The fluidized state of the temperature detection food of the air in the hot cell, according to the thermistor element sensor Direct current output obtains the temperature of thermistor element and the air themperature in the heating clamber, by these two kinds The combination of information, formation and conditional independence and the automatic running that can often keep good working order Micro-wave oven.
As mentioned above because aspect the of the present invention the 1st in the described micro-wave oven, be provided with by being placed on The thermistor element sensor of the gas contact that the heating object in the heating clamber is emitted, control device Big according to the AC compounent take the resistance value of above-mentioned thermistor element sensor as the signal of foundation Little, detect the steam that the indoor heating object of heat tracing is emitted in heating process, control is to microwave Generating means power supply outage so have following effect, does not namely need to resemble the use relative humidity sensor Like that, do not use the interchange reference power supply of circuit structure complexity in order not produce ionic polarization, also not Need to be incubated with heater in order to prevent the detecting element crystal boundary from stopping up and burn with heater termly Dirts etc. carry out the maintenance work of many complexity.
Because the AC amplifier of the control device of the described micro-wave oven in the 2nd aspect of the present invention amplifies Output voltage take the resistance value of thermistor element sensor as the AC compounent of the signal of foundation, Comparison means compares the output voltage of AC amplifier and the reference voltage of voltage setting device, When the output voltage of AC amplifier than detect reference voltage that fluidized state uses when big with power-off signal Export to drive unit, drive unit is received from cutting off to above-mentioned behind the power-off signal of comparison means The electric power that microwave generating apparatus is supplied with, control device is heat tracing indoor heating object like this Heating process control is to the power supply outage of microwave generating apparatus.
Because the described thermistor element sensor in the 3rd aspect of the present invention is with the glass coating The bead thermistor element of layer only makes glass coating section and emits gas from heating object and contact institute With the baneful influence of the high temperature resistant humidity of energy, and the lead division of thermistor element is exposed to heating clamber In the outer air, thus the outer contact with air of lead division and heating clamber and cooling off, even have at high temperature Also can prevent from exporting down the effect of decline.
Because the described thermistor element sensor in the 4th aspect of the present invention is configured in the heating clamber Near the corner that the field intensity of the electric field that is produced by microwave generating apparatus dies down, so thermistor element And thermistor element ambient air temperature rise gets littlely, has to detect more accurately and is heated The effect of the fluidized state of thing instant food.
Because the described thermistor element sensor in the 5th aspect of the present invention is configured in the heating clamber Be provided with on the sidewall of microwave generating apparatus, so the electric-field strength of microwave becomes more weak, thermistor Element and thermistor element ambient air temperature rise get littler, have and can detect more accurately The effect of the fluidized state of heating object instant food.
Because the described thermistor element sensor in the 6th aspect of the present invention is configured in the heating clamber The gas with in the heating clamber that arranges attracts the outer attraction section place of heating clamber, simultaneously thermistor unit Part sensor and attraction section utilize the cooling air that is produced by above-mentioned cooling fan to cool off, so by In near the attraction section of thermistor element sensor and configuration thermistor element sensor by cold But fan coolling, so that thermistor element sensor and ambient air temperature rise thereof get is minimum, Has the effect that can detect more accurately the fluidized state of heating object instant food.
Because the AC amplifier of the control device of the described micro-wave oven in the 7th aspect of the present invention has The low-pass characteristic of the cut-off frequency lower than 5Hz is not so even long-term the use can make inspection because of dirt yet Survey characteristic variations, have the ability that to eliminate fully electromagnetic noise.
Because the AC amplifier of the described control device in the 8th aspect of the present invention has integrator, this is long-pending Divide utensil to have than exporting big average output, correspondence corresponding to the input of short waveform of repetition period Export the electrical time constant that rushes of little average output in the input of long waveform of monostable repetition period So long discharge time constant is even have the time constant of abundant length, also without the big time Lag behind, and the monostable signal absorption such as noise can be gone out, produce in the time of extracting clearly boiling simultaneously out The signal with short repetition period, comparison means can not produce vibration yet.
Because the control device of the described micro-wave oven in the 9th aspect of the present invention has the setting of the regulation set The time-setting mechanism of time, and time set, this time set by firing switch begin to measure by The setting-up time that time-setting mechanism is set, and will be used for reference voltage set for and compare heating object Be in the reference voltage instruction of the big voltage of the maximum output voltage of the AC amplifier under the fluidized state Export to the voltage setting device, the output reference voltage instruction is used for voltage when surpassing setting-up time The reference voltage of setting device is from being in the maximum of the AC amplifier under the fluidized state than heating object The voltage that output voltage is big becomes the setting voltage of regulation, and the voltage setting device is according to coming the self clock dress The reference voltage instruction of putting is set reference voltage for and is in fluidized state lower time than heating object and hands over The voltage that the maximum output voltage of stream amplifier is big or the setting voltage of regulation, so use continuously When the heating clamber of micro-wave oven at high temperature starts, in the setting-up time by the time set regulation, voltage Setting device is set reference voltage than heating object for is in AC amplifier under the fluidized state The voltage that maximum output voltage is big, comparison means are passing through not with the power-off signal input driving device Set common setting voltage for after the setting-up time, thus can not end by mistakenly stop after pressing firing switch, Just begin to stop control after emitting the gas that contains moisture in the food boiling, have and to obtain The effect of the micro-wave oven of good operability.
Because the drive unit of the control device of the described micro-wave oven in the 10th aspect of the present invention has setting The time-setting mechanism of the setting-up time of regulation; Being arranged on the thermistor element sensor puts with exchanging Between the big device or between AC amplifier and the comparison means or between comparison means and the drive unit, The switching device that when receiving cut-off signal, just disconnects, when receiving connection signal, just connects; And Begin to measure the setting-up time of being set by time-setting mechanism by firing switch, and with cut-off signal Export to switching device, so the time set of output connection signal when surpassing setting-up time is continuously When the heating clamber of the micro-wave oven that uses at high temperature starts, at the setting-up time by the time set regulation In, after switching device disconnects, not with the power-off signal input driving device, passed through setting-up time it After, after the switching device closure, with the power-off signal input driving device, so press behind the firing switch not Can end by mistakenly stop, just begin to stop control after emitting the gas that contains moisture in the food boiling, Has the effect that can obtain good operability and micro-wave oven simple in structure.
Because the drive unit of the control device of the described micro-wave oven in the 11st aspect of the present invention has delay Device, after this deferred mount was received the power supply signal of firing switch, delay stipulated time was then to little So the wave generating device power supply is the stipulated time of this control device before the starting microwave generating apparatus In the past, just started cooling fan, so can be discharged into and add will being trapped in high-temperature gas in the heating clamber Carry out simultaneously the starting of microwave generating apparatus and the detection of food boiling after outside the hot cell, have and to prevent End the high food of initial temperature by superheated effect.
Because the drive unit of the control device of the described micro-wave oven in the 12nd aspect of the present invention has delay Device, after this deferred mount was received power-off signal from comparison means, delay stipulated time disconnected then The electric power of supplying with to cooling fan is so that this control device makes after microwave generating apparatus is stopped is cold But fan works in setting time, can promptly the gas of emitting from food be discharged, Predicate mistakenly food even also can prevent during the Reusability micro-wave oven owing to the water vapour that is detained Boiling can prevent from being the condition of high temperature owing to heat-releasing device loses efficacy after microwave generating apparatus from stopping simultaneously, So have the effect in the life-span that can prolong microwave generating apparatus.
Because the free setting device of control device of the described micro-wave oven in the 13rd aspect of the present invention and Time set, above-mentioned time-setting mechanism is measured extremely from receiving the power supply signal of firing switch Receive from the i.e. time till the heating object boiling till the power-off signal of comparison means, And set the time expand that this Measuring Time be multiply by the multiplying power of regulation, above-mentioned time set is from receiving Begin to count this time expand the counting of this time expand to from the power-off signal of comparison means the time After the end, to drive unit output power-off signal, so after pressing firing switch, from control device Comparison means is exported power-off signal and is begun when food is fluidized state, process is by time-setting mechanism After the time expand of the regulation of setting, time set just to drive unit output power-off signal, stops to add Heat, so have such as certain food that the food that boils etc. is continued keep fluidized state Can provide the effect of suitable cooking length of time in the gastronomical process.
Because the described micro-wave oven in the 14th aspect of the present invention also has and accommodate the maintenance quilt in heating clamber The food bowl of heating thing and the weight sensing of the weight of the above-mentioned heating object of measurement that is connected with food bowl The heat time heating time of the regulation that the weight that device, control device have setting and weight sensor to measure is corresponding Time-setting mechanism, and time set, this time set is opened from the power supply signal that receives firing switch Begin, counting is by the heat time heating time of the regulation of time-setting mechanism setting, and the counting of this heat time heating time finishes After, to drive unit output power-off signal, drive unit receives the power-off signal from comparison means With from behind any one signal in these two signals of power-off signal of time set, cut off to little The electric power that wave generating device is supplied with, thus for example big when food weight, heat time heating time long, in the heating clamber Temperature rise highly, the Boiling detection generation time of the food that undertaken by the thermistor element sensor During hysteresis, the weight with the weight sensor measurement of being set by time-setting mechanism is corresponding having passed through Heat time heating time of regulation after, time set is than the food that is undertaken by the thermistor element sensor Boiling detection early, to drive unit output power-off signal, can not make owing to overheated so can provide The easy-to-use micro-wave ovens such as food drying.
Because the control device of the described micro-wave oven in the 15th aspect of the present invention has according to thermistor The resistance value of element sensor is removed the AC compounent of signal and integration that DC component is passed through Device, voltage setting device are according to the size of the DC component that obtains by integrating gear, and setting is stipulated Reference voltage, so even during along with the boiling of the temperature rise food of thermistor element sensor with The resistance value of thermistor element sensor is that the size of AC compounent of the signal of foundation reduces, but The voltage setting device can according to the size of the DC component that obtains by integrating gear, be set and exchange The reference voltage that is in proportion of component, thus can be relatively with same level to thermistor The resistance value of element sensor is that size and the reference voltage of AC compounent of the signal of foundation compares , can not produce the time lag that comparison means is judged, can with heating clamber in temperature irrespectively stable Ground detects the boiling of food, have can heating of food is inexcessive effect.
Because the with good grounds thermistor of the control device unit of the described micro-wave oven in the 16th aspect of the present invention The resistance value of part sensor is removed the AC compounent of signal and integrator that DC component is passed through; The high-temperature electric of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used is installed with decides device; And the size of the DC component that obtains by integrator and high-temperature electric be installed with decide the height that device is set The temperature reference voltage compares, when the size of the DC component that obtains by integrator than high temperature benchmark When voltage was big, the high temperature comparison means of output starting inhibit signal, drive unit were received firing switch Behind the power supply signal, to the microwave generating apparatus supply capability, receive the power-off signal from comparison means after, The electric power that cut-out is supplied with to microwave generating apparatus, and in the starting taboo of receiving from the high temperature comparison means Behind the stop signal, even receive the power supply signal of firing switch, also forbid supplying with electricity to microwave generating apparatus Power, and after receiving the power supply signal of firing switch is even receive starting from the high temperature comparison means Inhibit signal also continues to the microwave generating apparatus supply capability, so when the temperature of heating clamber is high, If the high temperature comparison means of control device compares high temperature by the size of the DC component that integrator obtains When reference voltage is big, output starting inhibit signal, drive unit is received rising from the high temperature comparison means After the moving inhibit signal, cut off the electric power of supplying with to microwave generating apparatus, therefore can stop basis with heat The resistance value of quick resistive element sensor is the microwave that the size of AC compounent of the signal of foundation is carried out The automatic running of stove begins, and has the effect that food surface drying or underheat can be prevented trouble before it happens Really.
Because having, the control device of the described micro-wave oven in the 17th aspect of the present invention receives firing switch Power supply signal and the starting inhibit signal from the high temperature comparison means after, the notice that gives the alarm dress Put, give the alarm, can allow the user so have when heating clamber is in high temperature lower time by notifying device The effect of knowing.
Because the with good grounds thermistor of the control device unit of the described micro-wave oven in the 18th aspect of the present invention The resistance value of part sensor is removed the AC compounent of signal and integrator that DC component is passed through; The high-temperature electric of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used is installed with decides device; And the size of the DC component that obtains by integrator and high-temperature electric be installed with decide the height that device is set The temperature reference voltage compares, when the size of the DC component that obtains by integrator than high temperature benchmark When voltage is big, the high temperature comparison means of output starting inhibit signal, the voltage setting device is received from height During the switching signal of temperature comparison means, the setting voltage of reference voltage from regulation switched to and be heated Thing is in the above voltage of maximum output voltage of fluidized state AC amplifier of lower time, so although When heating clamber is in high temperature lower time signal take the resistance value of thermistor element sensor as foundation AC compounent is subjected to thermal noise and only increases from the impact of the moisture of food surface evaporation, causes at food Product all reach just to predicate mistakenly before the fluidized state and are in fluidized state and cause heating not Foot, but at this moment because the high temperature comparison means is concluded the size ratio of the DC component that obtains by integrator The high temperature reference voltage is big, and to reference voltage setting device output switching signal, reference voltage is set After device is received switching signal from the high temperature comparison means, with the setting electricity of reference voltage from regulation Crush-cutting is changed to heating object, and to be in the maximum output voltage of fluidized state AC amplifier of lower time above Voltage, thus be not exported to drive unit from the power supply signal of comparison means, passed through by The heat time heating time of the regulation that the weight of measuring with weight sensor that time-setting mechanism is set is corresponding it After, time set is exported power-off signal to drive unit, so can be by measuring with weight sensor Heated food heat time heating time of the regulation that weight is corresponding is even have in the heating clamber under the condition of high temperature The effect that running also can carry out can not making the automatic running of heating of food deficiency.
Because the with good grounds thermistor of the control device unit of the described micro-wave oven in the 19th aspect of the present invention The resistance value of part sensor is removed the AC compounent of signal and integrator that DC component is passed through; The high-temperature electric of the high temperature reference voltage of the regulation that the condition of high temperature of setting detection regulation is used is installed with decides device; The size of the DC component that obtains by integrator and high-temperature electric be installed with decide the high temperature base that device is set Accurate voltage compares, when the size of the DC component that obtains by integrator than high temperature reference voltage When big, the high temperature comparison means of output starting inhibit signal; And be arranged on thermistor element and pass Fill between sensor and the AC amplifier or between AC amplifier and the above-mentioned comparison means or relatively Put and drive unit between, usually closed, only have the switching device that when receiving switching signal, just disconnects, So because if heating clamber is in high temperature high temperature of lower time comparison means concludes and obtain by integrator The size of DC component is bigger than high temperature reference voltage, then to switching device output switching signal, and the switch dress Put and receive from just disconnecting after the switching signal of high temperature comparison means, so be not that power-off signal is defeated Enter drive unit, passing through the weight of measuring with weight sensor of being set by time-setting mechanism After the heat time heating time of corresponding regulation, time set is exported power-off signal to drive unit, so energy Heated food heat time heating time by the regulation corresponding with the weight of weight sensor measurement has and can obtain Also can carry out can not making the automatic of heating of food deficiency even getting turns round in the heating clamber under the condition of high temperature The effect of the micro-wave oven simple in structure of running.
Because the with good grounds thermistor of the control device unit of the described micro-wave oven in the 20th aspect of the present invention The resistance value of part sensor is removed the AC compounent of signal and integrator that DC component is passed through; At least set a kind of room temperature voltage setting device of room temperature reference voltage of regulation; And long-pending to passing through At least a room temperature base that the size of the DC component that the branch device obtains and room temperature voltage setting device are set Accurate voltage compares, when the size of the DC component that obtains by integrator than room temperature reference voltage When big, export the room temperature comparison means of each switching signal, time-setting mechanism is being received from the room temperature ratio During each switching signal of device, will heat time heating time switch to and heating clamber from the setting-up time of regulation So the heat time heating time of each regulation take various weight as basis that interior temperature is corresponding is when the room temperature ratio Installing the size of the DC component that obtains by integrator sets extremely than room temperature voltage setting device When few room temperature reference voltage is big switching signal is exported to time-setting mechanism, the time set dress Put and to be changed with the temperature in the heating clamber is corresponding fixed heat time heating time by weight sensor, with being somebody's turn to do Heating heat time heating time after changing, after finishing this heat time heating time, time set is disconnected to drive unit output The signal of telecommunication is so even have the effect that the interior temperature rise of heating clamber can be inexcessive with heating of food yet Really.
Because the described micro-wave oven in the 21st aspect of the present invention also has the gas-heated in the heating clamber The heater heater and the heater heating control apparatus of control heater heater, the heating The device heating control apparatus the temperature comparison means by integrator obtain with the thermistor element sensing The resistance value of device is the temperature that the size of DC component of the signal of foundation is set than temperature setting device Reference voltage hour output the 2nd power supply signal, time set supplies according to the 1st of thermostat firing switch The signal of telecommunication begins to measure the heat time heating time of being set by time-setting mechanism, and is defeated when surpassing heat time heating time Go out power-off signal, heater driving device is beginning to time set occurring from the 1st power supply signal occurring Power-off signal till during, only have when receiving the 2nd power supply signal of temperature comparison means just to The power supply of heater heater, after receiving power-off signal from time set, the sever supply heater adds The electric power that hot charging is put is so after pressing the thermostat firing switch, what set by time-setting mechanism In heat time heating time, the temperature in heating clamber is set than temperature setting device and temperature reference voltages Suitable temperature hour, the temperature comparison means is exported the 2nd power supply signal, when surpassed heat time heating time and Before time set output power-off signal, heater driving device only has when receiving that temperature relatively fills During the 2nd power supply signal put just to the power supply of heater heater, therefore only with a thermistor Element sensor, heater heating control apparatus just can be protected heating clamber in the heat time heating time of regulation Be held in set point of temperature, have the micro-wave oven that to realize with heater.

Claims (15)

1.一种微波炉，其特征在于备有：收容被加热物的加热室；加热加热室内的被加热物的微波发生装置；向微波发生装置送冷却风的冷却风扇；将冷却风的一部分导向加热室内的吸气部；将加热室内的气体排放到加热室外的排气部；与由加热室内的被加热物放出的气体接触设置的热敏电阻元件传感器；以及根据以热敏电阻元件传感器的电阻值为依据的信号的交流分量的大小，对上述微波发生装置进行供电·断电控制的控制装置。1. A microwave oven, characterized in that it is equipped with: a heating chamber for accommodating an object to be heated; a microwave generating device for heating the object to be heated in the heating chamber; a cooling fan for sending cooling air to the microwave generating device; a part of the cooling air is guided to be heated The suction part in the room; the exhaust part that discharges the gas in the heating room to the outside of the heating room; the thermistor element sensor installed in contact with the gas released from the heated object in the heating room; and according to the resistance of the thermistor element sensor The value is a control device for controlling power supply and power failure of the above-mentioned microwave generating device based on the magnitude of the AC component of the signal. 2.根据权利要求1所述的微波炉，其特征在于：上述控制装置备有放大热敏电阻元件传感器检测到的信号的交流分量的交流放大器；设定检测预定的沸腾状态用的基准电压的电压设定装置；对交流放大器的输出电压和电压设定装置的基准电压进行比较，当交流放大器的输出电压比基准电压大时输出断电信号的比较装置；输出供电信号的起动开关；以及收到起动开关的供电信号后向上述微波发生装置供电、而在收到来自比较装置的断电信号后切断向上述微波发生装置供给的电力的驱动装置。2. The microwave oven according to claim 1, characterized in that: said control device is provided with an AC amplifier for amplifying the AC component of the signal detected by the thermistor element sensor; and the voltage of the reference voltage for detecting a predetermined boiling state is set Setting device; comparing the output voltage of the AC amplifier with the reference voltage of the voltage setting device, when the output voltage of the AC amplifier is larger than the reference voltage, a comparison device that outputs a power-off signal; a start switch that outputs a power supply signal; and receives A driving device that supplies power to the microwave generator after the power supply signal from the switch is activated, and cuts off the power supplied to the microwave generator after receiving the power-off signal from the comparison device. 3.根据权利要求1所述的微波炉，其特征在于：上述的热敏电阻元件传感器是带有玻璃被覆层的珠形热敏电阻元件，它是这样安装的，即，使玻璃被覆层的一端在加热室内或在从加热室通往外部的路径上与从被加热物放出气体接触，同时使包含被覆了玻璃被覆层的引出部的另一端暴露在上述加热室外的空气中。3. The microwave oven according to claim 1, characterized in that: the above-mentioned thermistor element sensor is a bead-shaped thermistor element with a glass coating, and it is installed in such a way that one end of the glass coating In the heating chamber or on the path from the heating chamber to the outside, it is in contact with the gas emitted from the object to be heated, and at the same time, the other end of the lead-out portion covered with the glass coating layer is exposed to the air outside the heating chamber. 4.根据权利要求2或3任意一项所述的微波炉，其特征在于：上述控制装置的交流放大器具有比5Hz低的截止频率的低通特性。4. The microwave oven according to any one of claims 2 or 3, characterized in that the AC amplifier of the control device has a low-pass characteristic with a cutoff frequency lower than 5 Hz. 5.根据权利要求2、3或4任意一项所述的微波炉，其特征在于：上述的控制装置的交流放大器有积分器，该积分器具有比对应于重复周期短的波形的输入而输出大的平均输出、对应于单稳态重复周期长的波形的输入而输出小的平均输出的冲电时间常数长的放电时间常数。5. The microwave oven according to any one of claims 2, 3 or 4, characterized in that: the AC amplifier of the above-mentioned control device has an integrator, and the integrator has a larger output than the input corresponding to the waveform with a short repetition period. The average output of the monostable state, corresponding to the input of the waveform with a long monostable repetition period, outputs a small average output with a charging time constant and a long discharge time constant. 6.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：上述控制装置有设定规定的设定时间的时间设定装置，及计时装置，该计时装置通过起动开关开始测量由时间设定装置设定的设定时间，且将用来把基准电压设定成比被加热物处于沸腾状态下的交流放大器的最大输出电压大的电压的基准电压指令输出给电压设定装置，当超过设定时间时输出基准电压指令，用来将电压设定装置的基准电压从比被加热物处于沸腾状态下的交流放大器的最大输出电压大的电压变为规定的设定电压，6. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: the above-mentioned control device has a time setting device for setting a prescribed setting time, and a timing device, and the timing device is activated by starting The switch starts to measure the set time set by the time setting device, and outputs a reference voltage command for setting the reference voltage to a voltage greater than the maximum output voltage of the AC amplifier when the heated object is in a boiling state to the voltage The setting device outputs a reference voltage command when the set time is exceeded, and is used to change the reference voltage of the voltage setting device from a voltage greater than the maximum output voltage of the AC amplifier when the heated object is in a boiling state to a specified setting Voltage, 上述电压设定装置根据来自计时装置的基准电压指令，将基准电压设定成比被加热物处于沸腾状态下时交流放大器的最大输出电压大的电压或规定的设定电压。The voltage setting means sets the reference voltage to a voltage greater than the maximum output voltage of the AC amplifier when the object to be heated is in a boiling state or to a predetermined set voltage based on a reference voltage command from the timekeeping device. 7.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：上述控制装置有设定规定的设定时间的时间设定装置；设置在热敏电阻元件传感器和交流放大器之间、或交流放大器和比较装置之间、或比较装置和驱动装置之间，当收到断开信号时便断开、当收到接通信号时便接通的开关装置；以及通过起动开关开始测量由时间设定装置设定的设定时间，且将断开信号输出给开关装置，当超过设定时间时输出接通信号的计时装置。7. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: the above-mentioned control device has a time setting device for setting a prescribed setting time; Between the amplifiers, or between the AC amplifier and the comparison device, or between the comparison device and the drive device, a switching device that is turned off when it receives an off signal and turns on when it receives an on signal; and by starting The switch starts to measure the set time set by the time setting device, and outputs an off signal to the switch device, and a timing device that outputs an on signal when the set time is exceeded. 8.根据权利要求2、3、4、5、6或7任意一项所述的微波炉，其特征在于：上述控制装置的驱动装置有延迟装置，该延迟装置收到起动开关的供电信号后，延迟规定时间，然后向微波发生装置供电。8. The microwave oven according to any one of claims 2, 3, 4, 5, 6 or 7, characterized in that: the driving device of the above-mentioned control device has a delay device, and after the delay device receives the power supply signal of the start switch, After a specified time delay, power is supplied to the microwave generator. 9.根据权利要求2、3、4、5、6、7或8任意一项所述的微波炉，其特征在于：上述控制装置的驱动装置有延迟装置，该延迟装置从比较装置收到断电信号后，延迟规定时间，然后断开向冷却风扇供给的电力。9. The microwave oven according to any one of claims 2, 3, 4, 5, 6, 7 or 8, characterized in that: the driving device of the above-mentioned control device has a delay device, and the delay device receives a power failure from the comparison device. After a predetermined time delay after the signal, the power supply to the cooling fan is cut off. 10.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：上述控制装置有时间设定装置和计时装置，上述时间设定装置从接收到起动开关的供电信号开始，测量至接收到来自比较装置的断电信号为止的即至被加热物沸腾为止的时间，并设定将该测量时间乘以规定的倍率的延长时间，上述计时装置从接收到来自比较装置的断电信号时开始计数该延长时间，该延长时间的计数结束后，向驱动装置输出断电信号。10. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: the above-mentioned control device has a time setting device and a timing device, and the above-mentioned time setting device starts from receiving the power supply signal of the start switch , measure the time until receiving the power-off signal from the comparison device, that is, the time until the object to be heated boils, and set the extension time of multiplying the measurement time by a specified magnification. The above-mentioned timing device receives the signal from the comparison device The extended time is counted when the power-off signal is issued, and the power-off signal is output to the drive device after the counting of the extended time is completed. 11.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：还备有在加热室内收容保持被加热物的食品皿和与食品皿连接的测量上述被加热物的重量的重量传感器，控制装置有设定与重量传感器测量的重量对应的规定的加热时间的时间设定装置，及计时装置，该计时装置从接收到起动开关的供电信号开始，计数由时间设定装置设定的规定的加热时间，该加热时间的计数结束后，向驱动装置输出断电信号，11. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: it is also equipped with a food dish for accommodating and maintaining the object to be heated in the heating chamber and a device connected to the food dish for measuring the object to be heated. The weight sensor of the weight, the control device has a time setting device for setting the prescribed heating time corresponding to the weight measured by the weight sensor, and a timing device, the timing device starts from receiving the power supply signal of the start switch, and the counting is set by the time The specified heating time set by the device, after the counting of the heating time is completed, output a power-off signal to the drive device, 上述驱动装置接收到来自比较装置的断电信号和来自计时装置的断电信号这两个信号中的任意一个信号后，切断向微波发生装置供给的电力。The drive means cuts off the power supplied to the microwave generating means upon receiving either one of the power-off signal from the comparison means and the power-off signal from the timer means. 12.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：上述控制装置备有根据热敏电阻元件传感器的电阻值，将信号的交流分量除去而使直流分量通过的积分器，上述电压设定装置根据通过积分装置得到的直流分量的大小，设定规定的基准电压。12. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: said control device is equipped with a device for removing the AC component of the signal and allowing the DC component to pass through according to the resistance value of the thermistor element sensor. In the integrator, the voltage setting means sets a predetermined reference voltage according to the magnitude of the DC component obtained by the integrating means. 13.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：上述控制装置有根据热敏电阻元件传感器的电阻值，将信号的交流分量除去而使直流分量通过的积分器；设定检测规定的高温状态用的规定的高温基准电压的高温电压设定装置；以及对通过积分器得到的直流分量的大小和高温电压设定装置设定的高温基准电压进行比较，当通过积分器得到的直流分量的大小比高温基准电压大时，输出起动禁止信号的高温比较装置，13. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: said control device has a device for removing the AC component of the signal and passing the DC component according to the resistance value of the thermistor element sensor an integrator; a high-temperature voltage setting device for setting a specified high-temperature reference voltage for detecting a specified high-temperature state; and comparing the magnitude of the DC component obtained by the integrator with the high-temperature reference voltage set by the high-temperature voltage setting device, When the magnitude of the DC component obtained by the integrator is greater than the high-temperature reference voltage, the high-temperature comparison device that outputs the start prohibition signal, 上述驱动装置收到起动开关的供电信号后，向微波发生装置供给电力，收到来自比较装置的断电信号后，切断向微波发生装置供给的电力，而在收到来自高温比较装置的起动禁止信号后，即使收到起动开关的供电信号，也禁止向微波发生装置供给电力，而在收到起动开关的供电信号后，即使收到来自高温比较装置的起动禁止信号，也继续向微波发生装置供电。After the drive device receives the power supply signal from the start switch, it supplies power to the microwave generator, and after receiving the power-off signal from the comparison device, it cuts off the power supplied to the microwave generator, and when it receives the start prohibition from the high-temperature comparison device After receiving the power supply signal from the start switch, it is forbidden to supply power to the microwave generator, and after receiving the power supply signal from the start switch, even if it receives a start prohibition signal from the high temperature comparator, it continues to supply power to the microwave generator. powered by. 14.根据权利要求13所述的微波炉，其特征在于：上述控制装置备有收到起动开关的供电信号和来自高温比较装置的起动禁止信号后，发出警报的通知装置。14. The microwave oven according to claim 13, wherein said control means is provided with a notification means for issuing an alarm after receiving a power supply signal from a start switch and a start prohibition signal from a high temperature comparison means. 15.根据权利要求2、3、4或5任意一项所述的微波炉，其特征在于：还备有对加热室内的气体加热的加热器加热装置和控制加热器加热装置的加热器加热控制装置，上述加热器加热控制装置备有：根据热敏电阻元件传感器的电阻值，将信号的交流分量除去而使直流分量通过的积分器；设定所希望的温度基准电压的温度设定装置；对通过积分器得到的直流分量的大小和温度设定装置设定的温度基准电压进行比较，当通过积分器得到的直流分量的大小比温度基准电压小时，输出第2供电信号的温度比较装置；输出第1供电信号的恒温器起动开关；设定所希望的加热时间的时间设定装置；根据恒温器起动开关的第1供电信号开始测量由时间设定装置设定的加热时间，当超过加热时间时输出断电信号的计时装置；以及在从出现第1供电信号开始至出现计时装置的断电信号为止的期间，只有当收到温度比较装置的第2供电信号时才向加热器加热装置供给电力，当从计时装置收到断电信号后，切断供给加热器加热装置的电力的加热器驱动装置。15. The microwave oven according to any one of claims 2, 3, 4 or 5, characterized in that: it is also equipped with a heater heating device for heating the gas in the heating chamber and a heater heating control device for controlling the heater heating device , the above-mentioned heater heating control device is equipped with: according to the resistance value of the thermistor element sensor, the AC component of the signal is removed and the integrator that makes the DC component pass; the temperature setting device for setting the desired temperature reference voltage; The size of the DC component obtained by the integrator is compared with the temperature reference voltage set by the temperature setting device. When the size of the DC component obtained by the integrator is smaller than the temperature reference voltage, the temperature comparison device that outputs the second power supply signal; output The thermostat start switch of the first power supply signal; the time setting device for setting the desired heating time; start measuring the heating time set by the time setting device according to the first power supply signal of the thermostat start switch, when the heating time is exceeded A timing device that outputs a power-off signal from time to time; and during the period from the occurrence of the first power supply signal to the power-off signal of the timing device, only when the second power supply signal of the temperature comparison device is received, it is supplied to the heater heating device Electric power, the heater drive device that cuts off the power supplied to the heater heating device after receiving a power-off signal from the timing device.
CN 97101071 1996-02-28 1997-01-30 Micro-wave oven Pending CN1161428A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100434806C (en) * 2004-07-20 2008-11-19 石芹侠 Contact type temperature measuring and controlling instrument for microwave oven
CN100578081C (en) * 2003-03-13 2010-01-06 松下电器产业株式会社 High-frequency heating equipment with steam generation function
CN106600937A (en) * 2017-01-10 2017-04-26 中山市晶威电子科技有限公司 Electric appliance achieving measuring signal wireless transmission between base and appliance body
CN106724777A (en) * 2015-11-24 2017-05-31 佛山市顺德区美的电热电器制造有限公司 The cooking methods of firing equipment, cooker and firing equipment
CN109700297A (en) * 2019-03-04 2019-05-03 中南林业科技大学 A kind of pattern rice special pressure induction IH electromagnetism recuperator
CN113840410A (en) * 2020-06-24 2021-12-24 博西华电器（江苏）有限公司 Radio frequency power source equipment, heating device and refrigeration equipment
CN114630453A (en) * 2020-12-09 2022-06-14 东京毅力科创株式会社 Power supply and inspection device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100578081C (en) * 2003-03-13 2010-01-06 松下电器产业株式会社 High-frequency heating equipment with steam generation function
CN100434806C (en) * 2004-07-20 2008-11-19 石芹侠 Contact type temperature measuring and controlling instrument for microwave oven
CN106724777A (en) * 2015-11-24 2017-05-31 佛山市顺德区美的电热电器制造有限公司 The cooking methods of firing equipment, cooker and firing equipment
CN106724777B (en) * 2015-11-24 2020-12-04 佛山市顺德区美的电热电器制造有限公司 Heating device, cooking apparatus and cooking method of heating device
CN106600937A (en) * 2017-01-10 2017-04-26 中山市晶威电子科技有限公司 Electric appliance achieving measuring signal wireless transmission between base and appliance body
CN109700297A (en) * 2019-03-04 2019-05-03 中南林业科技大学 A kind of pattern rice special pressure induction IH electromagnetism recuperator
CN113840410A (en) * 2020-06-24 2021-12-24 博西华电器（江苏）有限公司 Radio frequency power source equipment, heating device and refrigeration equipment
CN114630453A (en) * 2020-12-09 2022-06-14 东京毅力科创株式会社 Power supply and inspection device

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