JPH06342686A - Electric heating device - Google Patents

Abstract

PURPOSE:To provide an electric heating device, which can raise the temperature quickly at the time of inputting a power supply and which can control the heat value per each part. CONSTITUTION:An electric heating device is provided with a first circuit, in which a first heater 101 and a first positive characteristic temperature coefficient resistor 103 are connected in series, and a second circuit, in which a second positive characteristic temperature coefficient resistor 104 and a second heater 1002 are connected in series, and a power source circuit 106. The first circuit and the second circuit are connected in parallel with the power source circuit 106, and at least a negative characteristic temperature coefficient resistor 105 is connected between a first connection of the first heater 101 and the first positive characteristic temperature coefficient resistor 103 and a second connection of the second positive characteristic temperature coefficient resistor 104 and the second heater 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating device such as an electric carpet.

[0002]

2. Description of the Related Art FIG. 3 shows a structure of a conventional electric heating device, for example, an electric circuit portion of an electric carpet. Heating element 301
And a temperature detection line 302 and a central control unit 303.
In the operation of this device, the temperature detection line 302 detects the highest temperature of the detection line, and the central control unit 303 turns ON / OFF the current flowing through the heating element 301 with a relay switch based on the highest temperature data. By controlling, the temperature of the electric heating device was controlled.

[0003]

However, in the structure of the conventional electric heating device described above, 1) the resistance is large because the heating element is composed of one. Therefore, there is a problem that the amount of heat generated by the heating element is small when the power is turned on, and it takes time to reach a desired temperature. However, it is not impossible to reduce the resistance of the heating element and increase the amount of heat generation, but if the relay switch is repeatedly turned on and off with a large current flowing, the welding of the contact, called locking, will occur due to the aging of the contact. However, the resistance of the heating element cannot be reduced unnecessarily because of the problem that it is likely to occur. 2) Since there is only one temperature detection line, it is not possible to detect the temperature at each location separately. Further, even if the temperature of each place can be detected, since the number of heating elements is one, it is not possible to control the amount of heat generated at each place separately. Therefore, it is not possible to control the temperature for each individual location of the electric heating device, and in the actual use environment where there is a cushion on the surface or there is a knee rest, the cushion that emits a small amount of heat from the surface. There is a case where the temperature of the other parts is low due to the fact that the current is controlled on the basis of this high temperature because it becomes hot just below. Therefore, the temperature when sitting down is low, even though it has been enough time after turning on the power,
The problem was that it wouldn't become warm unless I sat still for a while. However, even at that point, it is not impossible to increase the number of temperature detection lines and divide the heating element into several parts and control each of them, but a) wiring becomes complicated. In particular, there are problems that the wiring of the temperature detection line and the part where the heating element goes in and out of the control device becomes complicated, and b) the central control device that controls the current of the heating element based on the output of the temperature detection line becomes complicated. It was.

An object of the present invention is to solve the above-mentioned problems of the conventional electric heating device, and to provide an electric heating device in which the temperature rise at the time of power input is high and the amount of heat generation can be controlled for each place. .

[0005]

According to the present invention, there is provided a first circuit in which a first heating element and a first positive temperature coefficient resistor are connected in series, a second positive temperature coefficient resistor and a first positive temperature coefficient resistor. A second circuit in which two heating elements are connected in series and a power supply circuit are provided.
And the second circuit are connected in parallel to the power supply circuit, and the first heating element and the first positive temperature coefficient resistor
At least the negative characteristic temperature coefficient resistor is connected between the connection point, the second positive characteristic temperature coefficient resistor, and the second connection point of the second heating element.

[0006]

With the above structure, when the temperature is low at the time of power input, the resistance of the positive temperature coefficient resistor decreases and the resistance of the negative temperature coefficient resistor increases, so that the heating elements can be connected in parallel effectively. As a result, a large amount of heat generation can be obtained.

On the other hand, as the temperature rises, the resistance of the positive temperature coefficient resistor increases and the resistance of the negative temperature coefficient resistor decreases, so that the heating elements are effectively connected in series.

[0008]

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

FIG. 1A shows the structure of an electric heating device according to the first embodiment of the present invention.

In FIG. 1A, 101 and 102 are heating elements, and 103 and 104 are positive temperature coefficient resistors (hereinafter referred to as P
TC is abbreviated as TC, and 105 is a negative temperature coefficient resistor (hereinafter referred to as N
TC is abbreviated), and 106 is a power supply circuit. Heating element 101 and PTC 103 connected in series, PT connected in series
The C104 and the heating element 102 are connected in parallel to the power supply circuit 106, and the connection point between the heating element 101 and the PTC 103 and the connection point between the PTC 104 and the heating element 102 are NTC1.
It is connected at 05.

The operation of the present embodiment constructed as above will be described below.

First, when the temperature is low at the time of power input, etc., the resistances of the PTC 103 and PTC 104 become small and the NTC becomes small.
The resistance of 105 becomes large, and the current supplied from the power supply circuit 106 effectively flows in parallel to the circuits of the heating element 101 and PTC 103 and the circuit of PTC 104 and the heating element 102 as shown in FIG. The calorific value can be obtained. On the other hand, when the temperature rises, PTC103 and PTC1
The resistance of No. 04 becomes large and the resistance of NTC 105 becomes small, and as shown in FIG.
A current mainly flows in series with the heating element 105 and the heating element 102, and the amount of heat generation is about one-fourth that at low temperature. Further, if the temperature of the heating element 101 and the PTC 103 side of the electric heating device becomes low due to a person with a cold body coming in from outside sitting, the resistance of the PTC 103 becomes small and the electric current is generated by the heating element 10.
The amount of heat generation increases from 1 to PTC 103.

As described above, according to this embodiment, it is possible to speed up the temperature rise at the time of inputting the power source and to control the amount of heat generated at each place.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the configuration of an electric heating device according to the second embodiment of the present invention. In the figure, 20
1 and 202, 203 and 204 are heating elements, and 205 and 206
Reference numerals 207, 208, 209 and 210 are PTCs, 211, 212 and 213 are NTCs, and 214 is a power supply circuit. A heating element 201 and a PTC 205 connected in series, a PTC 206, a heating element 202 and a PTC 207 connected in series,
PTC 208, heating element 203 and PTC 2 connected in series
09, the PTC 210 and the heating element 204 that are connected in series are connected in parallel to the power supply circuit 214.

Further, the connection point between the heating element 201 and the PTC 205 and the connection point between the PTC 206 and the heating element 202 are NT.
It is connected by C211, and the connection point between the heating element 202 and the PTC 207 and the connection point between the PTC 208 and the heating element 203 are NTC.
The connection point between the heating element 203 and the PTC 209 and the connection point between the PTC 210 and the heating element 204 are NTC2.
Connected at 12.

The operation of the present embodiment configured as described above will be described below.

First, when the temperature is low at the time of power input, the resistance of PTC 205, 206, 207, 208, 209 and 210 is small, and NTC 211, 212 and 213.
And the current supplied from the power supply circuit 214 practically flows in parallel to the heating elements 201, 202, 203, and 204, and a large amount of heat can be obtained. On the other hand, when the temperature rises, PTC 205, 206 and 207
And 208, 209 and 210 increase the resistance, NTC
The resistance of 211, 212, and 213 decreases, and current flows in series through the heating element 201, the NTC 211, the heating element 202, the NTC 212, the heating element 203, the NTC 213, and the heating element 204. It becomes the calorific value of.

As for the non-uniformity of temperature due to the surrounding environment, the amount of heat generation is adjusted for each heating element by the resistance change of the PTC connected in series to each heating element.

As described above, according to the present embodiment, it is possible to speed up the temperature rise at the time of inputting the power source and to control the heat generation amount for each place.

The present invention is not limited to the circuit configuration as in the above embodiment, and a plurality of series circuits of a heating element and a positive temperature coefficient resistor are connected in parallel and connected to a power supply circuit.
Furthermore, the connection point between the heating element and the positive temperature coefficient resistor in any series circuit and the connection point between the heating element and the positive temperature coefficient resistor in any other series circuit have negative characteristics. When connected through a temperature coefficient resistor, the resistance value of the positive characteristic temperature coefficient resistor becomes small, and at the same time, the resistance value of the negative characteristic temperature coefficient resistor becomes large, the heating element of each series circuit is , If the resistance value of the positive characteristic temperature coefficient resistor is large and the resistance value of the negative characteristic temperature coefficient resistor is small at the same time, the power supply circuit is connected in parallel. Other circuit configurations may be used as long as the heating elements are electric heating devices that are connected in series to each other and are connected to the power supply circuit.

In place of the negative characteristic temperature coefficient resistor,
A resistor having a resistance value between the resistance value of the positive temperature coefficient resistor at low temperature and the resistance value at high temperature may be used.

[0023]

As is apparent from the above description,
According to the present invention, by connecting a heating element, a positive temperature coefficient resistor (PTC) and a negative temperature coefficient resistor (NTC) in combination, the temperature rises rapidly at the time of power input, and heat is generated at each location. It is possible to realize an electric heating device whose amount can be controlled.

[Brief description of drawings]

FIG. 1 (a) is a circuit diagram showing a configuration of an electric heating device in a first embodiment of the present invention, and FIG. 1 (b) illustrates an operation in the first embodiment of the present invention. FIG. 3C is a circuit diagram for explaining the operation in the first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of an electric heating device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of an electric circuit section of a conventional electric heating device.

[Explanation of symbols]

101, 102 Heat generating element 103, 104 Positive temperature coefficient resistor (PTC) 105 Negative temperature coefficient resistor (NTC) 106 Power supply circuit 201, 202, 203, 204 Heat generating element 205, 206, 207, 208, 209, 210 P
TC 211, 212, 213 NTC 214 power supply circuit

Claims (2)

[Claims] 1. A first circuit in which a first heating element and a first positive temperature coefficient resistor are connected in series, and a second positive temperature coefficient resistor and a second heating element are connected in series. A second circuit and a power supply circuit, wherein the first circuit and the second circuit are connected in parallel to the power supply circuit, the first heating element and the first positive temperature coefficient. At least a negative characteristic temperature coefficient resistor is connected between the first connection point of the coefficient resistor, the second positive characteristic temperature coefficient resistor and the second connection point of the second heating element. An electric heating device characterized by the above. 2. A plurality of series circuits comprising a heating element and a positive temperature coefficient resistor are connected in parallel and connected to a power supply circuit.
Furthermore, the connection point between the heating element and the positive temperature coefficient resistor in any series circuit and the connection point between the heating element and the positive temperature coefficient resistor in any other series circuit have negative characteristics. When connected through a temperature coefficient resistor, the resistance value of the positive characteristic temperature coefficient resistor becomes small, and at the same time, the resistance value of the negative characteristic temperature coefficient resistor becomes large, the heating element of each series circuit is When the resistance value of the positive temperature coefficient resistor is large and the resistance value of the negative temperature coefficient resistor is small at the same time, each of the series circuits is connected to the power supply circuit in parallel. An electric heating device, characterized in that the heating elements of the circuit are substantially connected in series with each other so as to be connected to the power supply circuit.