JPH07142164A - High frequency heating device and control method thereof - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to shorten cooking time and improve temperature unevenness regardless of whether the object to be heated is solid, semi-solid, liquid or the like. [Structure] A plurality of power supply ports 9 and 1 provided in a heating chamber 1 for irradiating an object to be heated with microwaves from a microwave generation source 4.
0, and a control means for switching and distributing the output energy from the microwave generation source 4 to the plurality of power supply ports 9 and 10 during heating of the object to be heated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating apparatus for irradiating an object to be heated housed in a heating chamber with microwaves to perform dielectric heating and a control method thereof.

[0002]

2. Description of the Related Art As a high-frequency heating device of this type, the present applicant has previously provided power supply ports for irradiating an object to be heated with microwaves in the vicinity of a bottom portion and an upper portion of a heating chamber. One end of each of the waveguides is connected to the other end, and the other end of each of the waveguides joins each other and is connected to a microwave source. A switching means for propagating to one of the power supply ports is provided, and when the object to be heated is a liquid such as a liquor, for example, only the bottom side power supply port is used for heating so that the liquid load can be uniformly heated. Invented something (Japanese Patent Application No. 4-2)
21531).

[0003]

By the way, as described above, in a high-frequency heating apparatus having a plurality of power supply ports for irradiating the object to be heated with microwaves from the microwave source in the heating chamber, the following experiment was conducted. As a result of overlapping, whether the object to be heated is not only a liquid but also a solid or a semi-solid, a microwave generation source is applied to these multiple power supply ports while heating the object to be heated with a heating pattern corresponding to the cooking item. It was found that the cooking time can be shortened and the temperature unevenness can be improved by switching and distributing the output energy from.

The present invention has been made in view of the above circumstances, and it is possible to reduce the cooking time and improve the uneven temperature even if the object to be heated is solid, semi-solid, liquid or the like. An object is to provide a heating device and a control method thereof.

[0005]

In order to solve the above-mentioned problems, the present invention firstly provides a plurality of power supply ports which are provided in a heating chamber and irradiate an object to be heated with microwaves from a microwave source. And a control means for switching and distributing the output energy from the microwave generation source to the plurality of power supply ports during heating of the object to be heated.

Secondly, a plurality of power supply ports provided in the heating chamber for irradiating the object to be heated with microwaves from the microwave source, and temperature detecting means for detecting the temperature of the object to be heated,
During heating of the object to be heated, a control means for switching and distributing the output energy from the microwave generation source to the plurality of power supply ports with a switching frequency and output per unit time according to the detection output of the temperature detecting means. Having it is the gist.

Third, a plurality of power supply ports provided in the heating chamber for irradiating the object to be heated with microwaves from the microwave generation source, and the microwaves to the plurality of power supply ports during heating of the object to be heated. The gist of the present invention is to have a control means for switching and distributing the output energy from the generation source and stopping the microwave generation source at the time of switching.

Fourth, a plurality of power supply ports for irradiating the object to be heated with microwaves from the microwave source are provided in the heating chamber, and the heating time is supplied to the plurality of power supply ports during heating of the object to be heated. The gist is to control so as to switch and distribute the output energy from the microwave generation source while increasing the switching frequency per unit time with the passage of time.

Fifth, the heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from the microwave generation source, and the heating time is supplied to the plurality of power supply ports during heating of the object to be heated. The gist is to control so as to switch and distribute the output energy from the microwave generation source while reducing the output per unit time with the passage of time.

Sixthly, in the fifth configuration, when the output of each power supply port is below the variable output range of the microwave generation source, the average is obtained by combining the output on-time and the output off-time within a predetermined time. The gist is to reduce the output to the output of each power supply port.

Seventhly, the heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from the microwave generation source, and each of the above-mentioned members is heated with heating time during heating of the object to be heated. The gist of the invention is to control so that the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while changing the ratio of the output energy per unit time between the power supply ports.

Eighth, the heating chamber is provided with power feed ports for irradiating the object to be heated with microwaves from the microwave generation source from above and below, respectively. The gist is that after heating by irradiation with a wave, heating is performed by irradiation with a microwave from an upper power supply port.

Ninth, the heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from the microwave generation source, and during heating of the object to be heated, a unit time The output frequency from the microwave generation source is switched and distributed to the plurality of power supply ports while increasing the switching frequency per hit and reducing the output, and further changing the ratio of the output energy between the power supply ports. The point is to control.

[0014]

In the above structure, firstly, by switching and distributing the output energy of the microwave generation source to the plurality of power supply ports during heating of the object to be heated, the object to be heated is heated evenly and the cooking time is shortened. It is possible to shorten and improve temperature unevenness.

Secondly, by detecting the temperature of the object to be heated during heating of the object to be heated, the switching frequency and output level of the plurality of power supply ports per unit time according to the detected temperature are optimally set. It is possible to shorten the cooking time and improve the temperature unevenness.

Thirdly, there is a microwave problem in the switching transition state by stopping the microwave generation source during the switching transition when switching and distributing the output energy from the microwave generation source to the plurality of power supply ports. Even if the switching device is used, it is possible to prevent the microwave generation source from being adversely affected.

Fourthly, during heating of the object to be heated, the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while increasing the switching frequency per unit time as the heating time elapses. The heating pattern makes it possible to shorten the cooking time and improve the temperature unevenness of an object to be heated such as frozen shimeji.

Fifth, during heating of the object to be heated, heating is performed by switching and distributing the output energy from the microwave generation source while reducing the output per unit time to the plurality of power supply ports as the heating time elapses. The pattern makes it possible to shorten the cooking time and improve the temperature unevenness of an object to be heated such as frozen tuna.

Sixth, in the fifth control, when the output of each power supply port is below the variable output range of the microwave generation source, the output on-time and the output off-time within a predetermined time are appropriately combined. This makes it possible to reduce the average output to the output that should be set for each power feed port.

Seventh, while the object to be heated is being heated, the ratio of the output energy per unit time between the power feed ports is changed as the heating time elapses, and the microwave generation sources are fed to the plurality of power feed ports. The heating pattern of switching and distributing the output energy of the above makes it possible to shorten the cooking time and improve the temperature unevenness in the case of raw thawing of ground beef, for example.

Eighth, it is possible to thaw without unevenness by heating the object to be heated by irradiation of microwaves from the lower power supply port and then heating by irradiation of microwaves from the upper power supply port. Becomes

Ninth, during the heating of the object to be heated, the switching frequency per unit time is increased and the output is decreased as the heating time elapses, and further the ratio of the output energy between the power supply ports is changed. By switching and distributing the output energy from the microwave generation source to multiple power supply ports while
Cooking can be performed with an optimal heating pattern according to the type of the object to be heated, such as solid, semi-solid, or liquid, and cooking time can be shortened and temperature unevenness can be improved.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention and shows the structure of a microwave oven as a high frequency heating device. In this microwave oven, a magnetron 4 as a microwave generation source for generating microwaves is provided outside the side wall 2 of the heating chamber 1, and the propagation direction of the microwaves from the magnetron 4 is set to the upper waveguide 6 side and the lower side. A switching device 12 as switching means for switching to the waveguide 7 side is provided.
A control circuit as control means (not shown) for controlling the magnetron 4 and the switching device 12 is provided in the machine room where the magnetron 4 and the like are provided. A power supply port 9 through which microwaves are radiated to the tip of the upper waveguide 6.
An (upper power supply port) is formed, and the power supply port 9 is located above the side wall 2 and opens into the heating chamber 1. Lower waveguide 7
Is connected to the waveguide 8 below the heating chamber 1, and this waveguide 8
The power supply port 10 (lower power supply port) formed at the tip of is located substantially in the center of the bottom surface 3 of the heating chamber 1 and opens into the heating chamber 1. A turntable 11 is made of a material that can transmit microwaves.

During heating of the object to be heated, the switching device 12 switches so that the microwave propagates to each of the lower waveguide 7 and the upper waveguide 6. When the switching device 12 is switched so that the microwave is propagated to the lower waveguide 7, the microwave oscillated from the magnetron 4 propagates from the waveguide 5 to the waveguides 7 and 8 through the switching device 12. Then, the inside of the heating chamber 1 is irradiated from the power supply port 10. Switching device 1
2 is switched so as to propagate to the upper waveguide 6, the microwave oscillated from the magnetron 4 is transmitted to the waveguide 5.
Through the switching device 12 to the waveguide 6 and the power supply port 9
Is irradiated into the heating chamber 1.

FIG. 2 shows the result of performing the thawing and warming of 15 freezing sows while switching the upper power supply port 9 and the lower power supply port 10 in the high-frequency heating apparatus having the above-mentioned configuration. FIG. 3 is shown as a comparative example, and shows a result of heating the food by irradiating the heating chamber 1 with microwaves only from the upper power supply port 9. In the tables of FIG. 2 (b) and FIG. 3 (b),
The outermost peripheral temperature is the average temperature of eight outer rims, and the inner peripheral temperature is the average temperature of six outer rims between the outer rim and the center. As shown in FIGS. 2 and 3, the heating time is 4 minutes 20 by heating the food while switching the upper power supply port 9 and the lower power supply port 10 over time.
It is reduced from seconds to 3 minutes and 40 seconds. Further, the temperature difference (the temperature obtained by subtracting the minimum temperature from the maximum temperature of the frozen sweet potato at the end of heating) decreases from 29 ° C to 21.5 ° C. As described above, when the switching device 12 switches the upper power supply port 9 and the lower power supply port 10 to heat the food with the passage of time, the cooking time can be shortened and the temperature unevenness can be improved.

FIG. 4 is an enlarged view of the heating pattern of FIG. 2 (b), and FIG. 5 is a flow chart from when food is actually placed on the turntable 11 in the cooking chamber 1 to the end of heating. Indicates. 5A is a main flow chart, and FIG. 5B is a subprogram of the timer part. First, fifteen frozen sweet potatoes are stored in the cooking chamber 1. The total heating time T required from the start of food cooking to the end of cooking is set. The total heating time T is divided into _three under the condition of T ₁ > T ₂ = T ₃ (step 20). T ₁ , T ₂ and T ₃ are the respective heating times that have been divided, and are T ₁ , T ₂ and T ₃ from the start of heating. In the first heating time T ₁ , the time for heating the food from the upper power supply port 9 is t ₁ , the time for heating the food from the lower power supply port 10 is t ₁ ′, and t ₁ and t ₁ ′ are set ( Steps 21 and 22). In the second heating time T ₂ , the time for heating the food from the upper power supply port 9 is t _2, and the time for heating the food from the lower power supply port 10 is t ₂ ′, t ₂
And t ₂ 'is set (steps 23 and 24). Within the heating time T ₃ , the time for heating the food from the upper power supply port 9 is t ₃
And the time for heating the food from the lower power supply port 10 is t ₃ '
And set t ₃ and t ₃ '(steps 25, 2
6). Heating is performed by sequentially switching the upper and lower power supply ports 9 and 10 according to the time set as described above, and the heating time ends (steps 27 to 39), and the cooking of the frozen simmer is completed. When the food is heated according to the heating pattern shown in FIG. 4, the cooking time can be shortened and the temperature unevenness can be improved.

Each power supply port is provided on the lower surface, the ceiling, the side surface of the heating chamber 1,
In a microwave heating device which is provided at any place such as the rear side and has two or more power feeding ports, and the switching device 12 has a function of switching so as to propagate microwaves to each power feeding port, food heating time is It is assumed that the heating time is divided into n and the divided heating times are T ₁ , T ₂ , T ₃ , ... T _n from the start of heating with the passage of time. The heating times T ₁ , T ₂ , T ₃ , ... T _n are the heating times for irradiating the heating chamber 1 with microwaves from the respective power supply ports provided on the side wall of the heating chamber 1 or the like. The switching device 12 propagates the microwave to each power supply port. T ₁ ≧ T ₂ ≧
Shortening the cooking time in the same manner as above by setting T ₃ ≧ ... ≧ T _n (> is included one or more times in ≧) and the switching frequency per unit time to a large value as the heating time elapses. It is possible to improve temperature unevenness.

FIGS. 6 to 8 show a second embodiment of the present invention. In the present embodiment, control is performed so that the output energy from the magnetron is switched and distributed to a plurality of power supply ports while the output per unit time is reduced as the heating time elapses. FIG. 6 shows a microwave switching device 12 in the microwave heating device having the structure shown in FIG.
Switch to the upper power feed port 9 and the lower power feed port 10 with the heating chamber 1
The result of heating the frozen tuna 500g by irradiating the inside and the heating pattern of switching the microwave between the upper power feeding port 9 and the lower power feeding port 10 by the switching device 12 are shown. 6C is a heating pattern of the upper power feed port 9, and FIG. 6D is a lower power feed port 1.
The heating pattern is 0. FIG. 7 is shown as a comparative example, and shows the result of heating the frozen tuna 500 g by irradiating the heating chamber 1 with microwaves only from the upper power supply port 9 and a heating pattern of irradiating microwaves from the upper power supply port 9. 6,
As shown in FIG. 7, by heating the food while switching the upper power feeding port 9 and the lower power feeding port 10 over time, the heating time is shortened from 6 minutes 48 seconds to 4 minutes 19 seconds. Furthermore, the temperature difference decreases from 14 ° C to 8 ° C. In this way, as the heating time elapses, the switching device 12 reduces the output level per unit time and the upper power supply port 9
When the food is heated by switching between the lower power supply port 10 and the lower power supply port 10, cooking time can be shortened and temperature unevenness can be improved.

This will be further described with reference to FIG. First, when food is placed on the turntable 11 in the cooking chamber 1, the total output energy E _o is set from the food weight detected by the weight sensor and the cooking item set on the panel, for example. And the total output energy E _o and P required for food
_{From max} , the total heating time T when the output is decreased with time as shown in FIG. 8A is set by the following equation.

T = 2E _o / P _max P _max : maximum output value The total heating time T is divided every n seconds, and the output energy E _k of the k-th heating time is obtained by the following calculation.

E _k = 2E _o (n−k + 1/2) / n ² microwaves are radiated from the upper power feed port 9 to E _k * 1/2 and from the lower power feed port 10 to E _k * 1/2. 8 (b),
This heating pattern is shown in (c). 8B is a heating pattern by the upper power feed port 9, and FIG. 8C is a lower power feed port 1.
It is a heating pattern by 0. When the food is heated by such a heating pattern, cooking time can be shortened and temperature unevenness can be improved. When the total heating time T is divided every n seconds, for example, when the final heating time is shorter than n seconds, the final heating time is truncated.

Although the output is reduced in proportion to the time here, the output may be reduced as follows. The total heating time from the start of food cooking to the end of cooking is divided into n equal parts. At each of the divided heating times, the total of the output energy applied to the food from each power supply port is calculated as E ₁ from the start of cooking,
Assume that E ₂ , ... E _n . When E ₁ ≧ E ₂ ≧ ... ≧ E _n (> is included one or more times in ≧), cooking time can be shortened and temperature unevenness can be improved.

9 and 10 show a third embodiment of the present invention. In the present embodiment, when the output of each power feed port is below the output variable range of the magnetron, the average output is lowered to the output of each power feed port by combining the output on time and the output off time within a predetermined time. is there. That is, in the microwave heating device having the configuration shown in FIG. 1, in the microwave heating device in which the outputs from the upper power feeding port 9 and the lower power feeding port 10 are both unchangeable below 400 W, the microwave heating device shown in FIG.
When the food is heated using the heating patterns shown in the upper power supply port and (b) the lower power supply port, the food is actually heated in the heating pattern shown in FIG. This can be done as follows for the output portion of 400 W or less in the output pattern. P is an output of 400 W or less to be set. When the output P is turned on for t seconds, t _on = t * P / P _min t _off = t−t _on P _min : the minimum output value that can be output, here 400
W, t _on : time to turn on at the output P _min , and t _off : time to turn off the output.

This will be described in more detail with reference to FIG. The figure (a) is the output of the upper power feed port, and the figure (b) is the output of the lower power feed port. 8 at the start of heating as shown in FIG.
When the power is turned on from the upper power feed port for 20 seconds from 0 second to 100 seconds with the output energy of 300 W for 20 seconds, as shown in FIG.
By turning on at 400 W for 2 seconds and then turning off for 5 seconds, 2 seconds from the 80th to 100 seconds at the start of heating
The average output for 0 seconds can be 300W. The same applies to the case of the lower power feed port. As shown in FIG. 9, when it is desired to turn on the power from the lower power feed port for 20 seconds for 20 seconds from the 100th to 120 seconds at the start of heating, as shown in FIG. From the 100th second when heating starts
Turn on 15 seconds 15 seconds at 400W for 15 seconds, then 5
By providing the off state for a second, the average output for 20 seconds from the 100th to 120 seconds at the start of heating can be set to 300W.

11 and 12 show a fourth embodiment of the present invention. As shown in FIG. 11, the microwave oven of the present embodiment is provided with a temperature detecting means 15 for detecting the temperature of the food placed on the turntable 11, for example, the surface temperature of the food, on the upper surface of the heating chamber 1. ing. In the microwave heating device having such a configuration, FIG. 1 shows a case where fifteen frozen sardines are cooked using the heating pattern in which the upper power feed port and the lower power feed port described in FIG. 4 of the first embodiment are combined.
This will be described with reference to the flowchart of No. 2. First, fifteen frozen sweet potatoes are placed on the turntable 11 in the cooking chamber 1. Let T be the total heating time required from the start of food cooking to the end of cooking. First, set the number of times the upper power supply port 9 and the lower power supply port 10 are switched to 1 to heat the food,
The temperature detecting means 15 detects that the food temperature T _f reaches 2-3 ° C. (steps 40-50). The heating time from the start of cooking up to this point and T _a, since when the heating time is T _b, the switching frequency of the heating time T _b the upper feed port 9 and the lower power port 10 twice, i.e. step 51
~ 58 are repeated twice ("A" in step 59 indicates the subprogram in steps 51 to 58) to heat the food. When the food is heated by such a heating pattern, cooking time can be shortened and temperature unevenness can be improved. In this way, the temperature detecting means 1
By detecting the temperature of the food stored in the heating chamber 1 by 5, it is possible to set the heating time from each power supply port according to the temperature of the food, that is, the switching frequency per unit time and the magnitude of the output energy. The food can be heated with an optimum heating pattern according to the temperature of the food.

FIG. 13 shows a fifth embodiment of the present invention.
In this embodiment, while heating the object to be heated, the output energy from the magnetron is switched and distributed to a plurality of power supply ports while changing the ratio of the output energy per unit time between the power supply ports as the heating time elapses. It is something that is done. In the microwave heating apparatus shown in FIG. 1, first, when food is placed on the turntable 11 in the heating chamber 1,
For example, the total output energy E _o is set from the food weight detected by the weight sensor and the cooking item set on the panel. Total output energy E _o required for food and Fig. 13 (a)
As shown in, the total heating time T when the output P is constant is set by the following equation.

T = E _o / P The total heating time T is divided every n seconds, and the output energy E _k of the k-th heating time is _calculated by the following equation.

E _k = P * n microwaves from upper feed port 9 to a × E _k , lower feed port 1
Irradiate from 0 to b × E _k . a + b = 1, a> 0, b> 0
And a and b are variables. FIG. 13B shows a heating pattern by the upper power feeding port 9 at this time, and FIG. 13C shows a heating pattern by the lower power feeding port 10. For example, in the case of raw thawing of ground beef, it is preferable to reduce b with the passage of time. When the food is heated by such a heating pattern, cooking time can be shortened and temperature unevenness can be improved. When the total heating time T is divided every n seconds, for example, when the final heating time is shorter than n seconds, the final heating time is truncated.

Although the output level is constant here, the output may be decreased in proportion to time, for example. The ratio of output energy from each power supply port may be changed according to the type of food. In addition, for example, the temperature detection means described in the fourth embodiment may be used to change the output per unit time from each power supply port according to the state of food.

14 and 15 show a sixth embodiment of the present invention. In the present embodiment, during heating of the object to be heated, the switching frequency per unit time is increased and the output is decreased as the heating time elapses, and further, the ratio of the output energy between the power supply ports is changed. Meanwhile, the output energy from the magnetron is switched and distributed to a plurality of power supply ports. In the microwave heating device shown in FIG.
First, when food is placed in the heating chamber 1, the total output energy E _o is set from the food weight detected by the weight sensor and the cooking item set on the panel, for example. The total heating time T is set from the total output energy E _o required for the food and the output waveform as shown in FIG. This time T is divided into three, and the heating time of each is T ₁ , T from the start of cooking.
₂ and T ₃ . Here, T ₁ > T ₂ = T ₃ . The output energy of the heating time T ₁ is E ₁ . Heating time T
_During the period ₁ , microwaves are radiated from the upper power feed port 9 with the output energy a * E ₁ for the heating time t _{1 and} from the lower power feed port 10 with the output energy b * E ₁ for the heating time t ₁ ′. a
+ B = 1, a> 0, b> 0, and at the heating time T ₁ ,
a = 1/4 and b = 3/4. When t ₁ + t ₁ ′ = T ₁ , as shown in (b) (upper power feed port) and (c) (lower power feed port) of FIG. 14, the output is not turned off during the heating time T ₁ . When t ₁ + t ₁ '<T ₁ , (a) in FIG.
As shown in (upper power feed port) and (b) (lower power feed port), the output is turned off during the heating time T ₁ . When the food is heated in such a heating pattern according to the type of food, the cooking time can be shortened and the temperature unevenness can be improved.

FIG. 16 shows a seventh embodiment of the present invention.
In the present embodiment, in the microwave heating device shown in the first, first, the lower power feeding port 10 is heated and then the upper power feeding port 9 is heated so that the thawing can be performed evenly. It is a thing. FIG. 16 is a diagram showing a cross section of a frozen tuna. For example, when thawing a frozen tuna, if heating is started from the upper power supply port 9, the lower part of the frozen tuna (the non-shaded portion in FIG. 16A) Remains in the frozen state, the microwave is likely to permeate the frozen portion even if it is heated from the lower power supply port 10 next time, and there is a possibility that sufficient thawing may not be performed (FIG. 16).
(See (a)). On the other hand, if the heating is first performed from the lower power supply port 10, such a situation can be avoided and the thawing can be performed without unevenness (see FIG. 16B).

FIG. 17 shows an eighth embodiment of the present invention.
As a switching device 12 in a microwave oven for heating food while sequentially switching a plurality of power supply ports, as shown in FIG. 17, a waveguide is switched by rotating a rotating portion 14 around a central portion of a fixed portion 13. If you use
Within the switching time (transition time) of the switching device 12, the microwave generated from the magnetron does not reach either of the power supply ports and returns to the magnetron to give an adverse effect. As described above, when the switching device 12 having a microwave problem is used in the transient state at the time of switching, the magnetron is turned off in the transient state, and the magnetron is turned on again when the switching is completed. By performing such switching control, it is possible to prevent the above-mentioned adverse effects.

[0043]

As described above, according to the present invention,
First, since the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports during heating of the object to be heated, the object to be heated is heated evenly, which shortens the cooking time and the uneven temperature. Can be improved.

Secondly, while heating the object to be heated, the output energy from the microwave generating source is switched and distributed to a plurality of power supply ports with the switching frequency and output per unit time according to the detected temperature of the object to be heated. Thus, the optimum heating pattern can be set according to the temperature of the object to be heated, and the cooking time can be shortened and the temperature unevenness can be improved.

Thirdly, since the microwave generation source is stopped at the time of switching and distributing the output energy from the microwave generation source to the plurality of power supply ports, there is a microwave problem in the switching transient state. Even if the switching device is used, it is possible to prevent the microwave generation source from being adversely affected.

Fourth, while heating the object to be heated, the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while increasing the switching frequency per unit time as the heating time elapses. Therefore, for example, the cooking time can be shortened and the temperature unevenness can be improved for the object to be heated such as frozen shimeji.

Fifth, during heating of the object to be heated, the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while the output per unit time is reduced as the heating time elapses. Therefore, for a heated object such as frozen tuna, it is possible to reduce cooking time and improve temperature unevenness.

Sixthly, in the fifth control, when the output of each power supply port is below the output variable range of the microwave generation source, the combination of the output on time and the output off time within a predetermined time The average output can be reduced to the output that should be set for each power supply port.

Seventh, while the object to be heated is being heated, the ratio of the output energy per unit time between the power supply ports is changed as the heating time elapses, while the microwave generation sources are supplied to the plurality of power supply ports. Since the output energy is switched and distributed, the cooking time can be shortened and the temperature unevenness can be improved, for example, in the case of raw thawing of ground beef.

Eighth, since the object to be heated is heated by irradiation of microwaves from the lower power supply port and then heated by irradiation of microwaves from the upper power supply port, thawing is performed uniformly. be able to.

Ninth, during the heating of the object to be heated, the frequency of switching per unit time is increased and the output is decreased as the heating time elapses, and the ratio of the output energy between the power supply ports is changed. Since the output energy from the microwave generator is switched and distributed to multiple power supply ports while cooking, cooking can be performed with the optimum heating pattern according to the type of object to be heated such as solid, semi-solid, and liquid. As a result, the cooking time can be shortened and the temperature unevenness can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an internal configuration of a first embodiment of a high-frequency heating device according to the present invention.

FIG. 2 is a diagram showing an example of a cooking result according to the first embodiment and an output waveform of each power supply port.

FIG. 3 is a diagram showing an example of a cooking result as a comparative example of FIG. 2 and an output waveform of a power supply port.

FIG. 4 is an enlarged view showing an output waveform of each power supply port in FIG.

FIG. 5 is a flow chart for explaining a heating control action in the first embodiment.

FIG. 6 is a diagram showing an example of cooking results and output waveforms of each power supply port in the second embodiment of the present invention.

7 is a diagram showing an example of a cooking result and an output waveform of a power supply port as a comparative example of FIG.

FIG. 8 is a waveform diagram for explaining the output energy of each power supply port in the second embodiment in more detail.

FIG. 9 is a diagram showing an output pattern of each power supply port in the third embodiment of the present invention.

10 is a diagram showing an example of an output waveform when the output pattern of FIG. 9 is realized by a combination of an output on time and an output off time within a predetermined time.

FIG. 11 is a perspective view showing the internal structure of a high-frequency heating device according to a fourth embodiment of the present invention.

FIG. 12 is a flow chart for explaining the heating control action of the fourth embodiment.

FIG. 13 is a diagram showing an output pattern of each power supply port in the fifth embodiment of the present invention.

FIG. 14 is a diagram showing an output pattern of each power feeding port in the sixth embodiment of the present invention.

FIG. 15 is a diagram showing an output pattern of each power feeding port in the sixth embodiment of the present invention.

FIG. 16 is a diagram showing a decompression status in a seventh embodiment of the present invention.

FIG. 17 is an exploded view of a switching device according to an eighth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating chamber 4 Magnetron (microwave generation source) 9 Upper power supply port 10 Lower power supply port 12 Switching device 15 Temperature detection means

Claims (9)

[Claims] 1. A plurality of power supply ports provided in a heating chamber for irradiating an object to be heated with microwaves from a microwave source,
A high-frequency heating device comprising: a control unit that switches and distributes output energy from the microwave generation source to the plurality of power supply ports during heating of an object to be heated. 2. A plurality of power supply ports provided in the heating chamber for irradiating the object to be heated with microwaves from a microwave generation source,
Temperature detecting means for detecting the temperature of the object to be heated, and during heating of the object to be heated, the microwaves are supplied to the plurality of power supply ports at a switching frequency and output per unit time according to the detection output of the temperature detecting means. And a control means for switching and distributing output energy from a generation source. 3. A plurality of power supply ports provided in the heating chamber for irradiating the object to be heated with microwaves from a microwave source,
A high-frequency heating apparatus comprising: a control unit that switches and distributes output energy from the microwave generation source to the plurality of power supply ports during heating of an object to be heated and that stops the microwave generation source during switching. . 4. The heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from a microwave generation source, and during heating of the object to be heated, the plurality of power supply ports are provided with a heating time. Along with this, a control method for a high-frequency heating device is characterized in that the switching energy per unit time is increased and the output energy from the microwave generation source is switched and distributed. 5. The heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from a microwave generation source, and the heating time is passed to the plurality of power supply ports during heating of the object to be heated. Along with this, a control method of the high-frequency heating device is characterized in that the output energy from the microwave generation source is controlled to be switched and distributed while reducing the output per unit time. 6. When the output of each of the power supply ports is below the variable output range of the microwave generation source, the average output is output up to the output of each of the power supply ports by combining the output on time and the output off time within a predetermined time. The control method of the high frequency heating apparatus according to claim 5, wherein the control method is lowering. 7. The heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from a microwave generation source, and each of the power supply ports is heated with heating time during heating of the object to be heated. A method for controlling a high-frequency heating device, characterized in that the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while changing the ratio of the output energy per unit time between them. 8. A heating chamber is provided with power feed ports for irradiating the object to be heated with microwaves from a microwave generation source from above and below, respectively. A method for controlling a high-frequency heating device, which comprises heating by irradiation and then heating by irradiation of microwaves from an upper power supply port. 9. The heating chamber is provided with a plurality of power supply ports for irradiating the object to be heated with microwaves from a microwave generation source, and during heating of the object to be heated The switching frequency is increased, the output is decreased, and the output energy from the microwave generation source is switched and distributed to the plurality of power supply ports while changing the ratio of the output energy between the power supply ports. A method for controlling a high-frequency heating device, comprising: