JPH0384886A - Temperature control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a temperature control device for heating devices such as electric carpets and electric blankets.

Conventional technology Conventionally, in order to improve the rise in temperature of the main body after power is turned on, this type of temperature control device uses a rapid heating circuit to set the variable resistor for temperature setting to a high setting when the power is turned on. After a certain period of time, set by a timer or the like, has elapsed, the variable resistor is automatically released from the seat and the temperature is returned to the set temperature.

However, with this method, when the power is turned on, the device heats up rapidly for a certain period of time set by a timer, etc., regardless of the temperature state of the device. Or conversely, if a long-pile tufted material is used as a surface material for an electric carpet, heat conduction to the surface is slow, so the high setting will be canceled before sufficient heat is supplied to the main body and surface material. There was a drawback that

As a technique to solve this drawback, there is a method in which the temperature is set after a certain period of time has elapsed after the surface temperature reaches the set temperature.

Problems to be Solved by the Invention However, in such a conventional configuration, for example, a temperature setting variable resistor and an 'rss switch are linked, and the temperature is turned on from a low temperature at the same time as the power is turned on. Suppose that when the temperature of the temperature sensor is higher than the temperature on the weak scale, the power is turned on and the temperature is set on the middle scale, which is higher than the weak scale. Normally, I would like it to be set after a certain period of time has passed after reaching the temperature on the intermediate scale that I set, but in this case, the temperature of the temperature sensor is higher than the temperature on the weak scale, so it goes into the high setting at the same time as the power is turned on. Since the high setting is canceled after a certain period of time has elapsed from this point, there is a problem in that a sufficient amount of heat is not supplied to the main body.

The present invention solves such conventional problems and aims to provide a more comfortable temperature control device.

Means for Solving the Problems In order to solve the above problems, the temperature control device of the present invention includes:
The main body is equipped with a heater, a temperature sensor that detects the temperature of the heater, a variable resistor for temperature setting, and a power switch, which are linked together to set the temperature from a low temperature when the power is turned on. temperature control means for controlling power supply to the heater so that the temperature of the main body reaches a set temperature; The device is equipped with strong preheating means that maintains the strong setting for a certain amount of time.

Effect With the above configuration, temperature control is started after a certain period of time has passed after the IT power is turned on.For example, even if the temperature sensor is higher than the temperature on the weak scale, the strong start is performed after reaching the set temperature, so it is always Can provide constant preheating.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of an electric carpet temperature control device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates an alternating current source, and reference numeral 2 indicates a temperature sensor, which is placed in the main body together with a heater 12 to obtain an alternating current temperature signal voltage, which is input to a temperature detection circuit 3, where it is converted into a direct current temperature signal voltage Vt. 5 is a temperature setting circuit, and 14 is a temperature setting variable resistor. 6 is a temperature control section using a comparator, which receives the signal Vt from the temperature detection circuit 3 on the (-) side and the signal V from the temperature setting circuit 5 on the (+) side.
s, and the control signals are input to a relay control section of a microcomputer (hereinafter referred to as a microcomputer) 10. 7 is a DC 1aia section for the microcomputer 10;
4 is a DC power supply section of a control section other than the microcomputer. Reference numeral 9 denotes a power switch detection section which inputs the on/off state of the power switch 8 to the microcomputer 10. A photocoupler 11 is turned on by a strong setting signal from the microcomputer 10, and switches both ends of the temperature setting variable resistor 14. 13 is a heater drive section.

FIG. 2 is a flowchart showing a series of operations of the temperature control device of the present invention. First, when the power switch 8 is turned on, the power switch detection section 9 detects this and starts the t1 timer. During the time period tl, the temperature control signal from the temperature control section 6 is ignored by the relay control section of the microcomputer 10, and the temperature control signal is input for the first time after t1 has elapsed and control is started. These movements are shown in S1 to S4.
Temperature I at 5! It is determined whether the 111m signal is off, that is, the DC temperature signal voltage Vt from the temperature detection circuit 3 and the set voltage VS from the temperature setting circuit 5, and if Vt>Vs, the relay control section of the microcomputer 10 sets it stronger. Exit signal, turn on photocoupler 11, temperature setting variable resistor 1
4, set it to strong and start the t2 timer. This is S6. On the other hand, if the temperature # control signal is on, that is, Vt<Vs, the relay is turned on as shown in S7. That is, here, if the temperature signal Vt is lower than the setting signal ■S, the relay remains on, and when it reaches Vs, a strong start is applied for the time t2. Next, the setting signal Vs'', which is set to a strong level, is compared with the temperature signal Vt, and when Vt >Vs', the temperature control signal is turned off.
Also turns off the relay. Further, when Vt<Vs, the relay is turned on and this control is continued until the time t2 elapses. This is shown in 88-S12. When the time t2 has elapsed, the strong setting is canceled and normal control is performed at the temperature set by the temperature setting variable resistor i4.

In this way, control is started after a certain period of time tl has elapsed after the power is turned on, so for some reason, for example, the resistance value of the temperature setting variable resistor 14 may vary in the positive direction, and the temperature on the weak scale may change. If the temperature becomes lower than the temperature detected by the temperature sensor 2, that is, even if V t >V s, the temperature is not controlled immediately after the power is turned on, so a strong start will not occur.

Effects of the Invention As is clear from the above description of the embodiments, the present invention is extremely useful in practice because the preheating time can be set uniformly regardless of the state of the main body when the power is turned on.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an electric carpet temperature control device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a series of operations of the electric carpet temperature control device. 2... Temperature sensor, 3... Temperature detection circuit, 5... Temperature setting circuit, 6... Temperature control section, 10... microcomputer, 1
1... Photo converter, 12... Heater, 13... Heater drive section.

Claims (2)

[Claims] (1) A main body including a heater, a temperature sensor for detecting the temperature of the heater, a temperature setting means for setting the temperature of the main body to a desired temperature, and a temperature setting means for setting the temperature of the main body to a desired temperature; Temperature control means for controlling power supply to the heater, and strong preheating means for starting temperature control after a certain period of time has elapsed after the power is turned on, and for maintaining the strong setting for a certain period of time once the set temperature is reached. Control device. (2) The temperature control device according to claim (1), wherein the temperature setting means is constructed by linking a temperature setting variable resistor and a power switch, and is configured to start from a low temperature at the same time as the power is turned on.