JP2001135459A - Temperature control device of electric heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To revise temperature deviation of temperature detectors of a heater at the time of moisture absorption, and to conduct precise temperature control even in the beginning of using the heater and in the case electricity is turned on after a longtime unused condition. SOLUTION: In this temperature control device of an electric heater, a heater 2 having the first temperature detector 8 and a relay 6 which controls electricity flow of the heater 2 are connected in series with a commercial power source 1, a temperature detection circuit 4 is connected to the first temperature detector 8 of the heater 2, this temperature detection circuit 4 and a temperature setting circuit 6 are connected to a microcomputer 7, a relay drive circuit 10 is connected to the output of the microcomputer 7, and by on and off of the relay 6 driven by the relay drive circuit 10, temperature control of main body 11 is conducted. In this temperature control device, the second temperature detector 13 which detects temperature indirectly is provide in a part of the above heater 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for an electric heater for controlling the temperature of an electric carpet or the like.

[0002]

2. Description of the Related Art In a conventional temperature control device for an electric heater used for an electric carpet or the like, a heater 2 is arranged in a meandering shape on a main body 11 as shown in FIG. It is connected to a controller box 12 attached to a corner of the main body 11. The controller box 12 has a built-in temperature control device for an electric heater as shown in FIG.

That is, a heater 2 and a relay 6 for controlling the energization of the heater 2 are connected in series to a commercial power supply 1, and a temperature detection circuit 4 for detecting the temperature of the heater 2 is connected. And a temperature setting circuit 5 connected to a microcomputer 7, a relay drive circuit 10 connected to an output terminal of the microcomputer 7, and opening and closing the relay 6 by a signal from the microcomputer 7 to control the temperature of the main body 11. Met.

(See, for example, JP-A-1-97387)

[0005]

However, in the above configuration, the material of the heat-sensitive layer used for detecting the temperature of the heater is generally a material obtained by mixing a conductive material with nylon resin. In addition, the impedance deviates due to the ambient humidity during standing, and the temperature detection value deviates.

That is, after leaving the electric carpet in a place with high humidity for a long period of time, there is a problem that the impedance of the nylon layer is lowered and the control temperature is lowered.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and comprises connecting a heater having a first temperature detecting means to a commercial power supply and a relay for controlling the energization of the heater in series. A first temperature detecting unit of the heater
A temperature detection circuit is connected to the temperature detection means, and the temperature detection circuit and the temperature setting circuit are connected to a microcomputer,
A relay drive circuit is connected to the output of the microcomputer, and in the temperature control device of the electric heater that controls the temperature of the main body by opening and closing a relay driven by the relay drive circuit, the temperature is indirectly applied to a part of the heater. And a second temperature detecting means for detecting the temperature.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is characterized in that a second temperature detecting means for indirectly detecting the temperature is provided in a part of the heater, so that the temperature of the electric carpet which has been left for a long time can be lowered at the beginning of energization. Good temperature control to control the prevention of blemishes.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, a heater 2 is disposed in a planar body 11 of an electric heater such as an electric carpet, and the heater 2 detects the temperature inside the heater 2 for example. It has a first temperature detecting means 8 composed of a heat-sensitive layer such as a nylon thermistor, and a second temperature composed of, for example, a semiconductor thermistor near the heater 2.
A temperature control means for controlling the temperature of the main body by the first temperature detection means and the second temperature detection means;
Is provided on the main body 11 and the controller box 12
Inside, the following constituent members are incorporated.

That is, the heater 2 having the first temperature detecting means 8 in the commercial power supply 1 and the relay 6 for controlling the energization of the heater 2 are connected in series, and the temperature of the heat-sensitive layer of the nylon thermistor of the heater 2 is detected. The temperature detecting circuit 4 is connected to the first temperature detecting means 8 which is a unit, the temperature detecting circuit 4 and the temperature setting circuit 5 are connected to the microcomputer 7, and the relay driving circuit 10 is connected to the output terminal of the microcomputer 7. The temperature of the main body 11 is controlled by opening and closing the relay 6 according to a signal from the microcomputer 7.

Further, for example, a second part such as a semiconductor thermistor may be used to detect the temperature in a part of the heater 2 indirectly.
A temperature detecting means 13 is provided and connected to the microcomputer 7 via the second temperature detecting means 13.

Since the temperature of the main body 11 is uniform at the beginning of energization, the second temperature detecting means 13 only needs to detect a part of the temperature of the main body 11, and is disposed so as to be in contact with a part near the heater 2. It is.

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

FIG. 3 shows the temperature characteristics of the impedance of the nylon thermistor of the temperature detecting portion of the heater 2. The temperature characteristics of the nylon thermistor, which is the heat-sensitive layer, are shifted slightly due to moisture absorption.

The temperature deviation due to the moisture absorption is such that the moisture in the nylon is released with the energization time and the impedance is restored to a normal value.

Therefore, at the start of energization, the detected temperature of the heat sensitive layer is detected by comparing the temperature detected by the temperature detecting means (thermosensitive layer) 8 of the heater 2 with the temperature detected by the second temperature detecting means 13. Then, the microcomputer 7 corrects the temperature difference by the detected temperature of the thermosensitive layer to perform the temperature control.

That is, a temperature detection error due to moisture absorption of the temperature detected by the first temperature detecting means 8 is corrected by the second temperature detecting means 13.

Since the temperature deviation due to moisture absorption of the nylon thermistor decreases as the energization time increases, the microcomputer 7 is programmed to decrease the amount of temperature correction with the energization time.

[0020]

As described above, according to the present invention, it is possible to prevent the body temperature from being reduced due to the moisture absorption of the nylon sensor even when the use of the electric carpet is started at the beginning of the season or when the carpet is not used for a long time. It is possible to provide a comfortable and highly safe temperature control device for an electric heater.

[Brief description of the drawings]

FIG. 1 is a schematic plan 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 temperature characteristic diagram of a nylon sensor of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 4 is a schematic plan view of a temperature control device of an electric heater showing a conventional example.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Heater 4 Temperature detection circuit 5 Temperature setting circuit 6 Relay 7 Microcomputer 8 1st temperature detection means 10 Relay drive circuit 11 Main body 13 2nd temperature detection means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K058 AA42 BA02 CA52 CA55 CA61 CA65 CB22 CD04 CE12 CE16 3L072 AB04 AC02 AD19 AF14 5H323 AA14 BB01 CA10 CB02 DA01 DB06 EE01 FF03 FF10 GG04 GG08 GG30 HH05 KK05 MM02

Claims (1)

[Claims] 1. A heater (2) having a first temperature detecting means (8) in a commercial power supply (1), and the heater (2)
A relay (6) for controlling the energization of the heater (2) is connected in series, and a temperature detection circuit (4) is connected to a first temperature detection means (8), which is a temperature detection unit of the heater (2). 4) and a temperature setting circuit (5) are connected to a microcomputer (7), a relay drive circuit (10) is connected to the microcomputer (7), and a relay (6) driven by the relay drive circuit (10). By opening and closing
In a temperature control device for an electric heater for controlling the temperature of a main body (11), a second temperature detecting means (13) for indirectly detecting a temperature is provided in a part of the heater (2). Electric heater temperature control device.