JPH01108613A - Temperature controller - Google Patents

Abstract

PURPOSE:To rapidly increase a load temperature when a large difference exists between the load temperature and a preset temperature by controlling a conductive quantity to a heater based on a difference between the output of a temperature sensor and the preset temperature set at a temperature setting part. CONSTITUTION:When a power source switch is applied or a switch 7 for instructing fast-heating is operated, the ON/OFF of a thyristor 23 is controlled by extracting the difference between a temperature setting signal and a temperature detecting signal and comparing the difference with the temperature detecting signal. When the temperature of an electric blanket 35 is set near the temperature (preset temperature) set at a temperature setting circuit 9, the share of level up of the preset temperature can be reduced. In such a way, it is possible to prevent the electric blanket 35 from being heated abnormally, and to heat the electric blanket 35 is separated remarkably from the temperature (preset temperature) set at the temperature setting circuit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a temperature control device for controlling the temperature of electric blankets, electric carpets, electric floor heaters, and the like.

(Prior Art) Conventionally, for example, in a heating appliance such as an electric blanket, the blanket body and a controller (temperature control device) are connected by a cable or the like, and the temperature control device connects the heater wire between the blanket and the body. Many of them are designed to control the temperature of the blanket itself by controlling the amount of heat generated by the blanket itself.

FIG. 5 is a block diagram showing such an electric blanket and a temperature control device for controlling the temperature of this electric blanket.

The electric blanket 101 shown in this figure includes a blanket main body 102 formed in a bag shape and a one-wire wire 103 disposed within the blanket main body 2.

The one-wire wire 103 includes a core yarn 104 formed in a linear shape as shown in FIG.
and a heat-sensitive guide layer 106 formed to cover the core thread 104, a heater wire 107 spirally wound around the heat-sensitive guide layer 106, and a heat-sensitive guide layer 107 formed to cover the heater wire 107 and the heat-sensitive guide layer 106. Insulating jacket 10
8.

When a current is supplied to the heater wire 107, the heater wire 107 generates heat and raises the temperature of the blanket body 102. Furthermore, if the temperature of the heat-sensitive induction layer 106 changes,
Accordingly, the dielectric constant of this heat-sensitive induction layer 106 changes,
The capacitance between the sensor wire 105 and the heater wire 107 changes.

The temperature control device also includes a threshold circuit 111, a sensor output acquisition section 112, a control circuit 113, and a thyristor circuit 114, and detects the temperature output from the sensor wire 105 of the one-wire wire 103. The value of the signal S1 is compared with a preset temperature, and the temperature of the electric blanket 101 is controlled by controlling the current flowing through the heater wire 107 of the one-wire wire 103 based on the comparison result.

The rectifier circuit 111 is configured to rectify the AC voltage output from the AC commercial power supply 116 to generate voltages of predetermined values, and supplies each of these generated voltages to each part of the circuit.

Further, the sensor output acquisition section 112 is connected to the sensor wire 105.
Temperature detection signal S from current flowing into and out of
1 is generated and supplied to the control circuit 113.

The control circuit 113 includes a rapid heating circuit 117, a temperature setting circuit 118, and a temperature control circuit 120, and in a steady state, the value of the temperature detection signal S1 and a preset temperature are controlled. Based on the comparison result, the conduction of the thyristor circuit 14 is controlled to control the value (amount) of the current flowing through the heater wire 7. Also, when the power is turned on or the rapid heating switch is operated, -
The set temperature is increased for a certain period of time to increase the slippage of the current flowing through the heater wire 7.

As soon as the power is turned on, the rapid heating circuit 117 detects when the rapid heating switch is operated, generates a rapid heating instruction signal S3 for a certain period of time, and supplies this to the temperature setting circuit 118.

When the rapid heating instruction signal S3 is not supplied, the temperature setting circuit 118 generates a temperature setting signal $4 having a value set by the user or the like, and supplies this to the temperature control circuit 120. Further, when the rapid heating instruction signal S3 is being supplied, a temperature setting signal S4 having a value larger than the set value is generated and is supplied to the temperature control circuit 120.

The temperature control circuit 120 receives the value of the temperature detection signal s1, and
Compare the value of the temperature setting signal S4, and if the temperature of the electric blanket 101 is lower than the temperature indicated by the value of the temperature setting signal S4, generate a trigger signal S2 and supply it to the thyristor circuit 114. . As a result, the thyristor 121 constituting the thyristor circuit 714 becomes conductive, and the heater wire 10 constituting the one-wire wire 103
7 is supplied with electric current, and the temperature of the electric blanket 101 rises.

(Problem to be solved by the invention) By the way, in such a heating device, the electric blanket 10
1 actual temperature, the temperature obtained by the sensor wire 105 (
measured temperature).

Therefore, when the power is turned on or when the rapid heating switch is operated, the rapid heating circuit 117 switches to the temperature setting circuit 1.
The value of the temperature setting signal S3 output from 18 is increased by about 20 degrees.

However, with such control, as shown in FIG. 7, if the difference between the temperature of the electric blanket 101 and the set temperature is small, there is a risk that the temperature of the electric blanket 101 may rise to nearly 60 degrees.

Further, as shown in FIG. 8, when the difference between the temperature of the electric blanket 101 and the set temperature is large, there is a problem that it takes too long for the temperature of the electric blanket 101 to reach the set temperature.

In view of the above circumstances, the present invention prevents the load temperature from rising too much when the difference between the load temperature of the electric blanket, etc. and the set temperature is small, and also prevents the load temperature of the electric blanket, etc. It is an object of the present invention to provide a temperature control device that can quickly raise the load temperature when the difference between the set temperature and the set temperature is large.

[Structure of the Invention] (Means for Solving the Problems) -〇- In order to solve the above problems, the temperature control device according to the present invention has the following features: A temperature control device that compares the temperature and controls the amount of heat generated by the heater based on the comparison result includes: 1, a difference extraction unit that calculates the difference between the output of the temperature sensor and the set temperature set in the temperature setting unit; and an energization control section that controls the amount of energization to the heater based on the difference output from the difference extraction section.

(Function) In the above configuration, when a rapid temperature rise is required, for example when the rapid heat switch is operated at power-on, the difference extraction section is configured to combine the output of the temperature sensor with the temperature setting section. The energization control unit controls the amount of energization to the heater based on this difference to optimize the temperature rise.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of a temperature control device according to the present invention.

The temperature control device shown in this figure includes a rectifier circuit 1, a temperature detection circuit 2, a level shift circuit 3, a comparison circuit 4, a temperature control circuit 5, an initialization circuit 6, a switch 7, and a timer circuit 8. , a temperature setting circuit 9, and a thyristor 23.

The rectifier circuit 1 includes a diode 10, a resistor 11, a Zener diode 12, and a capacitor 13.
A voltage VEE is generated from the AC voltage output by the AC commercial power supply 14, and is supplied to each part of the circuit.

The temperature detection circuit 2 includes a resistor 15, a diode 16, an operational amplifier 17, a diode 18, and a capacitor 19. , generates a voltage signal (temperature detection signal) S5 corresponding to the amount of charge flowing out, and supplies this to the level shift circuit 3 and the comparison circuit 4.

Further, the temperature setting circuit 9 includes a resistor 21 and a variable resistor 22, generates a temperature setting signal S6 having a value set in the variable resistor 22, and supplies this to the level shift circuit 3.

The level shift circuit 3 includes a resistor 25, a first analog gate 26, a resistor 27, an operational amplifier 28, an operational amplifier 30, a second analog gate 31, and a capacitor 32. In the steady state, only the second gate open signal S8 is supplied from the timer circuit 8, so the temperature setting signal S6 is taken in and supplied to the comparator circuit 4 as is. Further, when the power switch is turned on or when the switch 7 for quick heating instruction is operated (time ti>, the initialization circuit 6, switch 7 hl, etc. At the same time as the inter-gate signal S7 is output, the second inter-gate signal S8 is supplied from the timer circuit 8 as shown in FIG. 2 analog gates 26 and 31 are turned on, the difference between the temperature setting signal S6 and the temperature detection signal S5 is extracted, and this is the difference between the temperature setting signal S6 and the temperature detection signal S5.
The signal is stored in the comparator circuit 4 and is also supplied to the comparator circuit 4. After this, until time t3, these first. 27th Q--26, 31 is turned off, and the capacitor 3
The differential voltage stored in the comparator circuit 4 continues to be supplied to the comparator circuit 4.

The comparison circuit 4 includes an operational amplifier 33, and compares the value of the temperature detection signal S5 supplied from the temperature detection circuit 2 with the differential voltage supplied from the level shift circuit 3 and the value of the temperature setting signal S6. When the value of the temperature detection signal S5 is larger than the difference voltage or the value of the temperature setting signal S6,
A "'Hi" signal is generated and supplied to the temperature control circuit 5.

When the temperature control circuit 5 receives the "H1" signal from the comparison circuit 4, it generates a trigger signal S9 and supplies it to the gate of the thyristor 23.

As a result, the thyristor 23 becomes conductive, and current is supplied to the heater wire 34 constituting the one-wire wire, which generates heat.

□ In this way, in this embodiment, as soon as the power switch is turned on and the quick heating instruction switch 7 is operated, the difference between the temperature setting signal S6 and the temperature detection signal S5 is extracted and the difference is detected. Since the on/off of the thyristor 23 is controlled by comparing the difference with the temperature detection signal S5, the temperature of the electric blanket 35 and the temperature set in the temperature setting circuit 9 are adjusted as shown in FIG. (set temperature), the level increase of the set temperature can be reduced. This can prevent the electric blanket 35 from being heated abnormally.

Furthermore, when the power switch is turned on or when the quick heating instruction switch 7 is operated, the temperature of the electric blanket 35 and the temperature set in the temperature setting circuit 9 (setting temperature), the set temperature can be increased by a large amount, and thereby the three electric blankets can be heated quickly.

[Structure of the Invention] As explained above, according to the present invention, when the difference between the load temperature of an electric blanket or the like and the set temperature is small, the load temperature can be prevented from rising too much. Further, when the difference between the load temperature of the electric blanket or the like and the set temperature is large, the load temperature can be quickly raised.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a circuit diagram showing an embodiment of the temperature control device according to the present invention, FIGS. 3 is a waveform diagram for explaining the same embodiment, FIG. 4 is a waveform diagram for explaining the same embodiment, FIG. 5 is a block diagram showing an example of a conventional temperature control device, and FIG. 6 is a waveform diagram for explaining the same embodiment. FIG. 5 is a perspective view of a one-wire wire, FIG. 7 is a waveform diagram showing an example of the operation of the temperature control device shown in FIG. 5, and FIG. 8 is an example of the operation of the temperature control device shown in FIG. 5. It is a waveform diagram. 3... Difference extraction part (level shift circuit) 4... Energization control part (comparison circuit) 7... Rapid heating switch (switch) 9... Temperature setting part (temperature setting circuit) 20... Temperature sensor (sensor wire) 34... Heater (heater wire) Agent Ji'L Shizo 6-・ Iji 3 5 Figure 6

Claims (1)

[Scope of Claims] A temperature control device that compares the output of a temperature sensor and a set temperature set in a temperature setting section, and controls the amount of heat generated by a heater based on the comparison result, comprising: the output of the temperature sensor. and a difference extraction section that calculates the difference between the temperature and the set temperature set in the temperature setting section, and an energization control section that controls the amount of electricity applied to the heater based on the difference output from the difference extraction section. A temperature control device featuring: