JPH0583623U - Electric heater temperature controller - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To secure the life of the switch that controls the electric heater of the electric heater and to obtain a better sense of warming. [Structure] An electric heater 2 and a temperature detection line 3 are provided in a main body 1, a switch 12 for controlling energization of the electric heater 2 is provided, and a temperature detection circuit 1 for performing temperature detection on the temperature detection line 3 is provided.
In the temperature control device of the electric heater, in which the switch 4 and the temperature detection circuit 14 are provided with the temperature setting means 7 through the temperature control circuit 5, the temperature control circuit 5 is provided with the electric heater 2.
A microcomputer 15 having a function of always keeping the ON / OFF cycle of the switch 12 for controlling the energization of 1) ON / OFF is provided. O of the switch 12 that controls energization of the electric heater 2 even if the amount of heat radiated from the main body 1 varies
The total time of N hours and OFF time, that is, the time of one cycle is constant, and the switch 1
Since the life time of 2 can be secured for a certain time, the switch 1
2 has a longer life.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temperature control device for an electric heater that controls the temperature of an electric carpet or the like.

[0002]

[Prior Art]

 In a conventional temperature controller for an electric heater such as an electric carpet, the temperature of the electric heater 2 is controlled as shown in FIG. The ON voltage of the switch 12 and the OFF voltage of the switch 12 set by 7 are compared by the comparator 16, and the output of the comparator 16 is controlled by the transistor 13 to control ON / OFF of the switch 12. The temperature of the main body 1 is controlled within a constant temperature range to maintain the set temperature. (See, for example, Japanese Utility Model Laid-Open No. 62-102911).

[0003]

[Problems to be solved by the device]

 However, according to the above configuration, the amount of heat radiated from the main body 1 varies depending on the temperature set by the temperature setting means 7, the material of the floor on which the main body 1 is installed, the ambient temperature of the main body 1, etc. Since the ON time and OFF time of the switch 12 that controls energization vary depending on the conditions, as shown in Fig. 5, the time t3 of one cycle becomes short when the heat radiation amount is large, and the time of one cycle when the heat radiation amount is small. As t3 becomes longer, the ON / OFF cycle time t3 varies.

Therefore, if the time t3 of one cycle is too short, the number of times the switch 12 is opened and closed is increased, and the life of the switch 12 is shortened.

Further, when the time t3 of one cycle is long, the energization interval of the electric heater 2 becomes long, so a warmer using an electric heater such as an electric carpet turns ON / OFF the electric heater 2. There was a problem that the feeling of heat collection was bad due to the feeling of the wave of.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems. An electric heater and a temperature detection wire are provided in the body, and a switch for controlling the energization of the electric heater is provided in the electric heater. In a temperature control device for an electric heater, which is provided with a temperature detection circuit for detecting temperature, and which is provided with temperature setting means for the switch and the temperature detection circuit via a temperature control circuit, in a temperature control circuit, energization control of electric heater A microcomputer having the function of always keeping the ON / OFF cycle time of the switch to be constant is provided.

Further, the temperature control circuit is provided with a microcomputer having a function consisting of a memory, a timer, a ROM and a CPU for always keeping the time of one ON / OFF cycle of a switch for controlling energization of an electric heater constant. I made it.

Further, a temperature control circuit provided with a microcomputer having functions of a memory, a timer, a ROM and a CPU, a temperature setting means for setting the temperature of the main body, a switch for controlling energization of an electric heater, and The controller box is equipped with a temperature detection circuit that detects the temperature of the temperature detection line.

[0009]

[Action]

 At the beginning of energization, the microcomputer first controls the energization of the electric heater according to the preset value of the ON / OFF duty of the relay depending on the temperature difference between the set temperature and the main body temperature.

Further, when the temperature of the main body reaches near the set temperature, the difference between the average temperature of the previous one cycle and the set temperature is detected, and the ON / OFF duty of the switch is corrected by the difference to set the set temperature. Control to keep.

At this time, after the temperature of the main body approaches the set temperature, the ON / OFF one cycle time of the switch is always constant, and the temperature is controlled only by changing the duty.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to the accompanying drawings FIGS.

In FIGS. 1 and 2, an electric heater 2 and a temperature detection wire 3 for detecting the temperature of the main body 1 are provided in the main body 1, and a temperature setting means 7 for setting the temperature of the main body 1 is provided. The controller box 4 provided is provided on the main body 1.

In the controller box 4, a power supply circuit 6 connected to a power supply S, a microcomputer 15 having a function including a CPU 11, a ROM 10, a memory 8 and a timer 9 connected to the power supply circuit 6, and a microcomputer 15 thereof. A temperature detection circuit 14 connected to the temperature setting means 7 and the temperature detection line 3 for detecting the temperature of the main body 1, a transistor 13 connected to the output side of the microcomputer 15, and its transistor 13. A switch 12 for controlling the temperature of the electric heater 2 connected to one end is provided. A temperature control circuit 5 is composed of a microcomputer 15 having a function of a CPU 11, a ROM 10, a memory 8 and a timer 9 and a transistor 13 connected to the output side of the microcomputer 15.

Next, the operation of the above configuration will be described.

The signal of the temperature setting means 7 and the signal of the temperature detection circuit 14 are taken into a microcomputer 15 having a function including a CPU 11, a ROM 10, a memory 8 and a timer 9, and the microcomputer 15 executes the arithmetic processing stored in the ROM 10. Then, the temperature of the main body 1 is kept constant by controlling the energization of the electric heater 2 by turning on and off the switch 12 via the transistor 13 by the output signal from the microcomputer 15.

In FIG. 3 showing the characteristics of the present invention, first, while the power source S is turned on and the temperature of the main body 1 rises to the set temperature, the switch 12 is kept ON and the electric heater 2 is energized. When the temperature of the main body 1 exceeds the set temperature, the electric heater 2 is turned off. Then, after a certain period of time, the electric heater 2 is turned on again for a certain period of time. At this time, the total time t3 of the time t1 when the electric heater 2 is off and the time t2 when the electric heater 2 is on is set to be constant for 3 minutes, for example. Then, the ON / OFF duty of the electric heater 2 in the next cycle is corrected by the difference between the average temperature of the ON / OFF cycle and the set temperature, and when the whole body 1 is warmed up, the ON time t2 of the electric heater 2 is turned on. On the other hand, the energization OFF time t1 of the electric heater 2 is lengthened, and the ON time t2 of the electric heater 2 and the energization OFF time t1 of the electric heater 2 are set so that the energization time t3 of one cycle is 3 minutes (constant). Determine and energize.

Further, for example, when the ambient temperature is low and the amount of heat radiated from the main body 1 is large, the ON time t2 for energization of the electric heating heater 2 is long and the OFF time t1 is short for energization to maintain the set temperature. When the amount of heat generated from the main body 1 is small, such as when the ambient temperature is high, the ON time t2 for energizing the electric heater 2 is shortened and the OFF time t1 is lengthened to maintain the set temperature. Since the operation is performed in this manner, the ON / OFF operation of the switch 12 is always kept constant for 3 minutes regardless of the heat generation amount of the main body 1 while keeping the main body 1 at the set temperature.

Further, the ON interval of the electric heater 2 becomes constant.

[0020]

[Effect of the device]

 As described above, the present invention has the following effects.

Even if the amount of heat radiated from the main body varies depending on the temperature set by the temperature setting means, the material of the floor on which the main body is installed, the ambient temperature of the main body, etc., the switch that turns on the electric heater is turned on. Depending on the conditions, the total time of the time and the OFF time has a large amount of heat radiation, or even when the amount of heat radiation is small, the time of one cycle is constant, and the time of one cycle of ON / OFF does not vary.

Further, since the number of times the switch is turned on and off is constant with respect to time, the life of the switch can be ensured for a certain period of time regardless of the operating conditions, so the life of the switch is extended. ..

It should be noted that, since the interval of turning on the electricity of the electric heater was not lengthened, the feeling of warming was improved without feeling the ON / OFF wave of the electric heater.

[Brief description of drawings]

FIG. 1 is an external perspective view of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 2 is a block diagram of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 3 is a characteristic diagram showing an operation of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 4 is a block diagram of a conventional temperature controller for an electric heater.

FIG. 5 is a characteristic diagram showing an operation of a temperature control device for an electric heater of a conventional example.

[Explanation of symbols]

 1 Main Body 2 Electric Heater 3 Temperature Detection Line 4 Controller Box 5 Temperature Control Circuit 6 Power Supply Circuit 7 Temperature Setting Means 8 Memory 9 Timer 10 ROM 11 CPU 12 Switch 13 Transistor 14 Temperature Detection Circuit 15 Microcomputer

Claims (3)

[Scope of utility model registration request] 1. An electric heater (2) and a temperature detection wire (3) are provided in the main body (1), and a switch (12) for controlling energization of the electric heater (2) is provided in the electric heater (2). Further, a temperature detection circuit (14) for detecting temperature is provided on the temperature detection line (3), and a temperature control circuit (5) is provided to the switch (12) and the temperature detection circuit (14). In a temperature control device for an electric heater provided with a setting means (7), one cycle of ON / OFF of a switch (12) for controlling energization of an electric heater (2) to a temperature control circuit (5) is always maintained. A temperature control device for an electric heater, comprising a microcomputer (15) having a constant function. 2. An ON / OFF switch (12) for controlling energization of an electric heater (2) to the temperature control circuit (5).
2. The electric heater according to claim 1, further comprising a microcomputer (15) having a function of a memory (8), a timer (9), a ROM (10) and a CPU (11) for keeping the time of one cycle of the above always constant. Temperature control device. 3. A memory (8), a timer (9) and a ROM
(10) and a temperature control circuit (5) provided with a microcomputer (15) having a function of a CPU (11), temperature setting means (7) for setting the temperature of the main body (1), and an electric heater (2). ) Is provided in the controller box (4) with a switch (12) for controlling energization and a temperature detection circuit (14) for detecting the temperature of the temperature detection line (3), and the controller box (4) is electrically heated. The temperature control device for an electric heater according to claim 1, wherein the heater (2) and the temperature detection wire (3) are provided in the main body (1).