JPH08622U - Electric heater temperature controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To secure the life time of the switch that controls the electric heater of the electric heater and to obtain a better feeling of warming. [Structure] An electric heater 2 and a temperature detection wire 3 for detecting the temperature of the electric heater 2 are provided in a main body 1, and a switch 12 for controlling energization of the electric heater 2 is provided in the electric heater 2, and further, The temperature detection line 3 to the temperature detection line 3
A temperature detection circuit 14 for detecting the temperature of the switch is provided, and the switch 12 and the temperature detection circuit 14 are provided with a temperature setting means 7 via a temperature correction circuit 5 and a room temperature detection means 1 for detecting the room temperature.
In the temperature controller of the electric heater provided with 7, the temperature setting means 7 and the room temperature detecting means 17 for detecting the room temperature keep the main body 1 at the set temperature, and the main body 1 is opened and closed regardless of the amount of heat generation. The time for one ON / OFF cycle of the container 12 was set to be always constant. Even if the amount of heat radiated from the main body 1 varies, the total time of the ON time and the OFF time of the switch 12 that controls the energization of the electrothermal heater 2, that is, 1
The cycle time becomes constant, and the life time of the switch 12 can be ensured for a fixed time regardless of the use condition, so that the life of the switch 12 becomes long.

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 control device for an electric heater such as an electric carpet, as shown in FIG. 4, the temperature of the electric heater 2 is controlled by converting the signal from the temperature detection line 3 into a DC voltage by the temperature detection circuit 14 and setting the temperature. 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 was 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 differ 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 time t3 of one ON / OFF cycle 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 poor due to the feeling of the waves.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, and an electric heater and a temperature detection line for detecting the temperature of the electric heater are provided in the main body, and the electric heater is opened / closed to control the energization of the electric heater. And a temperature detection circuit for detecting the temperature of the temperature detection line, and the switch and the temperature detection circuit are provided with a temperature setting means and a room temperature for detecting the room temperature through a temperature correction circuit. In a temperature control device for an electric heater provided with a temperature detecting means, the temperature setting means and a room temperature detecting means for detecting a room temperature keep the main body at a set temperature, and the opening / closing operation is performed regardless of the heat generation amount of the main body. The time of one cycle of ON / OFF of the container was set to be always constant.

Further, the ON / OFF duty of the electric heater in the next cycle is corrected by the difference between the average temperature of the ON / OFF cycle of the electric heater and the set temperature.

When the ambient temperature detected by the room temperature detecting means is low and the amount of heat radiated from the main body is large, the ON time t2 for energizing the electric heater is set to be long and the OFF time t1 is set to be short for energizing. It was supposed to keep the temperature.

When the ambient temperature detected by the room temperature detecting means is high and the amount of heat generated from the main body is small, the ON time t2 for energizing the electric heater is shortened and the OFF time t1 is lengthened to set the set temperature. I decided to keep it.

[0010]

[Action]

 When the signals input by the room temperature detecting means for detecting the room temperature, the temperature setting means and the temperature detection line are received by the temperature correction circuit having the microcomputer, the temperature correction circuit first sets the set temperature and the main body at the initial stage of energization. Depending on the temperature difference, the ON / OFF duty of the switch is preset in the program and the energization of the electrothermal heater is controlled according to the preset value.

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 1 cycle time of the switch is always constant and the temperature is controlled only by changing the duty.

[0013]

【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 provided controller box 4 is provided on the main body 1.

In the controller box 4, a power supply circuit 6 connected to the power supply S, a microcomputer 15 having a function of a CPU 11, a ROM 10, a memory 8 and a timer 9 connected to the power supply circuit 6, and the microcomputer 15 thereof. A temperature setting means 7 for setting the temperature of the main body 1 connected to the room temperature detecting means 17 for detecting the room temperature, and a temperature detection circuit 14 connected to 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 an opener 12 for controlling the temperature of the electric heater 2 connected to one end of the transistor 13 are provided.

It should be noted that the temperature correction circuit 5 is composed of a microcomputer 15 having a function 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 signals of the temperature setting means 7, the temperature detecting circuit 14, and the room temperature detecting means 17 are fetched into the temperature correcting circuit 5 provided with the microcomputer 11 having the functions of the CPU 11, the ROM 10, the memory 8 and the timer 9. The micro computer 15 of the temperature correction circuit 5 performs the arithmetic processing stored in the ROM 10, and controls the energization of the electric heater 2 by turning on / off the switch 12 via the transistor 13 according to the output signal from the micro computer 15. The temperature of the main body 1 is kept constant.

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.

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 of the next cycle is corrected by the difference between the average temperature of this ON / OFF cycle and the set temperature, and when the entire main body 1 becomes warm, the electric heater 2 The energization ON time t2 is shortened, while the energization OFF time t1 of the electric heater 2 is lengthened so that the energization time t3 of one cycle is 3 minutes (constant), the ON time t2 of the electric heater 2 and the electric heater 2 The energization OFF time t1 is determined to energize.

Further, for example, when the ambient temperature at room temperature is low and the amount of heat released from the main body 1 is large, the ON time t2 of the energization of the electric heater 2 is long and the OFF time t1 is short and the set temperature is maintained.

When the amount of heat generated from the main body 1 is small, such as when the ambient temperature at room 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.

[0027]

[Effect of 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 room temperature, 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 if 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.

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, thus extending the life of the switch. .

It should be noted that since the interval of turning on the electric heater is 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 conventional temperature controller for an electric heater.

[Explanation of symbols]

 1 main body 2 electric heater 3 temperature detection line 5 temperature correction circuit 7 temperature setting means 8 memory 9 timer 10 ROM 11 CPU 12 switch 14 temperature detection circuit 15 microcomputer 17 room temperature detection means

Claims (4)

[Scope of utility model registration request] 1. A main body (1) is provided with an electric heater (2) and a temperature detection wire (3) for detecting the temperature of the electric heater (2), and the electric heater (2) is provided with the electric heater (2). ) Is provided with a switch (12) for controlling energization,
Further, the temperature detection line (3) is provided with a temperature detection circuit (14) for detecting the temperature of the temperature detection line (3), and the switch (12) and the temperature detection circuit (14) are provided with a temperature correction circuit (5). In a temperature control device for an electric heater provided with a temperature setting means (7) and a room temperature detecting means (17) for detecting the room temperature, the temperature setting means (7) and the room temperature detecting means for detecting the room temperature. (17) keeps the main body (1) at the set temperature and keeps the ON / OFF cycle time of the switch (12) constant regardless of the amount of heat generated by the main body (1). Characteristic electric heater temperature control device. 2. ON / OFF of the electric heater (2)
2. The temperature control device for an electric heater according to claim 1, wherein the ON / OFF duty of the electric heater (2) in the next cycle is corrected by the difference between the average temperature and the set temperature of the cycle. 3. When the ambient temperature detected by the room temperature detecting means (17) is low and the amount of heat radiated from the main body (1) is large, the ON time t2 of energization of the electric heater (2) is lengthened and the OFF time is increased. The temperature control device for an electric heater according to claim 1, wherein t1 is shortened to energize to maintain a set temperature. 4. When the ambient temperature detected by the room temperature detecting means (17) is high and the amount of heat generated from the main body (1) is small, the ON time t2 for energizing the electric heater (2) is shortened and the OFF time is reduced. The temperature control device for an electric heater according to claim 1, wherein the set temperature is maintained by lengthening t1.