JPH0583620U - Electric heater temperature controller - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To secure the life time of the relay that controls the electric heater of the electric heater and to obtain a good feeling of warming. [Structure] A temperature control circuit 5 for controlling energization of the electric heater 2 is provided on the electric heater 2 and the temperature detection line 3 in the main body 1, and the temperature control circuit 5 is connected to a power source S and a temperature setting means 7 and temperature setting means 7 are provided. In the temperature control device for an electric heater, which is provided with a relay 12 for controlling energization of the electric heater 2, a transistor 13 for ON / OFF driving the relay 12 and a temperature detection circuit 14 for detecting temperature by the temperature detection line 3, Setting temperature by setting means 7 and temperature detection circuit 14
The temperature signal from the microcomputer 1 is calculated by the microcomputer 15, and the ON / OFF cycle of the relay 12 is set to a fixed time to change the ON / OFF duty to control the temperature of the main body 1 to the set temperature. The control circuit 5 is used, and the number of times the relay 12 is turned on / off is constant over time.

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 relay 12 and the OFF voltage of the relay 12 set by 7 are compared by the comparator 16, and the output of the comparator 16 is ON / OFF controlled by the transistor 13 via the transistor 13. It was configured to maintain the set temperature by controlling the temperature of the body 1 within a constant temperature range. (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 relay 12 for controlling energization vary depending on the conditions, as shown in Fig. 5, the time of one cycle becomes short when the heat radiation amount is large, and the time of one cycle becomes long when the heat radiation amount is small. Therefore, the time of one cycle of ON / OF F varies.

For this reason, if the time of one cycle is too short, the number of times the relay 12 is opened and closed increases and the life of the relay 12 becomes short.

Further, when the time 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 by providing an electric heater and a temperature detection wire in the main body, and controlling the energization of the electric heater to the electric heater and the temperature detection wire, a timer, a ROM, A temperature control circuit consisting of a microcomputer equipped with a CPU is provided, and a power supply circuit connected to the power supply to the temperature control circuit, a temperature setting means, a relay for controlling energization of an electric heating heater, and a transistor for ON / OFF driving of the relay, and In a temperature control device for an electric heater equipped with a temperature detection circuit that detects temperature with a temperature detection line, the microcomputer calculates the set temperature set by the temperature setting means and the temperature signal from the temperature detection circuit, and Control the temperature of the main body to the set temperature by changing the ON / OFF duty by changing the ON / OFF cycle for a fixed time. That was temperature control circuit having a function.

[0007]

[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.

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 relay is corrected by the difference to maintain the set temperature. To control.

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

[0010]

【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 arranged 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 the power supply S, a CPU 11 connected to the power supply circuit 6, a microcomputer 10 including a ROM 10, a memory 8 and a timer 9 and a microcomputer 15 connected to the microcomputer 15. The temperature setting circuit 7 and the temperature detection circuit 14 connected to the temperature detection line 3 for detecting the temperature of the main body 1, the transistor 13 connected to the output side of the microcomputer 15, and one end of the transistor 13. A relay 12 for controlling the temperature of the connected electric heater 2 is provided. The temperature control circuit 5 is composed of a microcomputer 15 including 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 composed of a CPU 11, a ROM 10, a memory 8 and a timer 9, and the microcomputer 15 performs arithmetic processing stored in the ROM 10, The temperature of the main body 1 is kept constant by controlling the energization of the electric heater 2 by turning on / off the relay 12 via the transistor 13 by the output signal from the micro computer 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 relay 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 relay 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.

[0018]

[Effect of the device]

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

The ON time of the relay that controls the energization of the electric heater 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. Depending on the conditions, the total time of ON and OFF times is constant even if the heat radiation amount is large or the heat radiation amount is small, and the ON / OFF 1 cycle time does not vary.

Further, since the number of times the relay is turned ON / OFF is constant with respect to time, the life of the relay can be ensured for a certain period of time regardless of the operating conditions, so the life of the relay is extended.

It should be noted that since the interval of turning on the electricity of the electric heater did not become long, there was no sense of the ON / OFF wave of the electric heater, and the warming feeling was improved.

[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 Relay 13 Transistor 14 Temperature Detection Circuit 15 Microcomputer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Matsuzaki 3-1, Shinjuyo, Kashiwa-shi, Chiba 1

Claims (1)

[Scope of utility model registration request] 1. A main body (1) is provided with an electric heater (2) and a temperature detection wire (3), and the electric heater (2) and the temperature detection wire (3) are controlled to energize the electric heater (2). Memory (8), timer (9), ROM (10), CPU
A temperature control circuit (5) comprising a microcomputer (15) provided with (11) is provided, and the temperature control circuit (5) is connected to a power source (S), a power supply circuit (6), temperature setting means (7) and electric heating. A relay (12) for controlling energization of the heater (2), a transistor (13) for ON / OFF driving of the relay (12), and a temperature detection circuit (14) for temperature detection by a temperature detection line (3) are provided. In the temperature controller of the electric heater, the microcomputer (15) calculates the set temperature set by the temperature setting means (7) and the temperature signal from the temperature detection circuit (14) to turn on / off the relay (12). One cycle of OFF is set to a fixed time and O
A temperature control device for an electric heater, comprising a temperature control circuit (5) having a function of controlling the temperature of the main body (1) to the set temperature by changing the duty of N / OFF.