JPH10326670A - Temperature control device of electric heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit provision of a power switch by performing current carrying to a control circuit at the same time as selection of the heater to be current carried using a plurality of switches. SOLUTION: One side of each heater 4 is connected with a plurality of switches 2 at the commercial power source 1 and the other sides of heaters 4 and connected with the power source 1 through the contact of a relay 9, and a control circuit 6 is provided to generate connection with a temp. sensor 10 located near the heater 4 so as to conduct the current carrying control to the relay 9 according to the temp. sensed by the sensor 10, and a power supply circuit 11 is connected with the control circuit 6. In this temp. control device of an electric heater, the switches 2 are connected with the power supply circuit 11 through a diode 7.

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 As shown in FIG. 3, a conventional temperature control device for an electric heater such as an electric carpet connects a contact of a relay 9 to a commercial power supply 1 via a power switch 12, and switches each heater 4 to a respective switch. 2, a heater 4 to be energized by the switch 2 is selected, and a temperature sensor 1
In order to control the energization of the relay 9 at the detected temperature of 0, the power supply circuit 11 is connected to the power supply switch 12,
Is supplied to the control circuit 6. (For example, see Japanese Patent Application Laid-Open No. Hei 7-212436)

[0003]

However, in the above configuration, the current capacity of the power switch 12 needs to be larger than the total current amount of the plurality of heaters 4 (for example, 10 A). This leads to an increase in the size of the entire control device.

Another disadvantage is that an expensive power switch must be used.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a plurality of switches connected to a commercial power supply and one of the heaters connected to each of the switches, and the other of the plurality of heaters connected to a relay. And a control circuit connected to the temperature sensor so as to perform energization control of the relay based on a detected temperature detected by a temperature sensor near the heater, and a power supply to the control circuit. In a temperature control device for an electric heater configured by connecting a power supply circuit to be supplied, each of the plurality of switches is connected to a power supply circuit by a diode.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a plurality of switches are connected to a commercial power supply and one of the heaters is connected to each of the switches, and the other of the plurality of heaters is connected to a commercial power supply via a relay contact. An electric heating system configured by connecting a control circuit connected to the temperature sensor so as to control the energization of the relay based on a detected temperature detected by a temperature sensor near the heater, and a power supply circuit for supplying power to the control circuit. In the temperature control device of the heater, each of the plurality of switches is connected to the power supply circuit by a diode, so that when any of the switches connected to each heater is turned on, the heater energization is started, and at the same time, the diode is turned on. To supply power to the control circuit through the power supply circuit.

Therefore, the power switch is not required in the temperature control device of the electric heater.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of the present invention.
This will be described with reference to FIG.

In FIG. 1 and FIG. 2, a plurality of heaters 4 and temperature sensors 10 are provided in a planar body 13 of an electric heater such as an electric carpet.
A controller box 14 having temperature control means for controlling the temperature of the main body 13 is provided at an end of the main body 13. The following components are incorporated in the controller box 14.

A plurality of switches 2 are connected to the commercial power supply 1 and one of the heaters 4 is connected to each of the switches 2, and the other of the plurality of heaters 4 is connected to the commercial power supply 1 via a contact of a relay 9. 4 connects a control circuit 6 connected to the temperature sensor 10 so as to control the energization of the relay 9 based on the detected temperature detected by the temperature sensor 10 in the vicinity of the temperature sensor 10, and a power supply circuit 11 for supplying power to the control circuit 6. And a power supply circuit 11 connected to each of the plurality of switches 2 by a diode 7.

Next, the operation of one embodiment of the present invention in the above configuration will be described. When the switch is selected by turning on the power supply surface of the electric carpet or the like, that is, by turning on the switch 2 of the power supply heater, the power supply to the power supply circuit 11 is started via the diode 7 and the power supply to the heater 4 is controlled by the relay 9 and the main body 13 of the electric carpet or the like is controlled. Temperature control.

Further, any of the heaters 4 can be
Is not selected, that is, all switches 2 are OFF
In this case, the energization of the heater 4 and the energization of the control circuit 6 are also stopped.

As described above, since the control circuit 6 can be energized simultaneously with the selection of the heater 4 to be energized by the plurality of switches 2, an additional power switch can be dispensed with.

[0014]

As described above, according to the temperature control device for an electric heater of the present invention, the following effects can be obtained.

That is, it is assumed that a plurality of switches are connected to the commercial power supply and one of the heaters is connected to each switch, and the other of the plurality of heaters is connected to the commercial power supply via a relay contact. By connecting the power supply circuit that supplies power to the control circuit and the power supply circuit to each of the plurality of switches with a diode, the switch can also be used as a heater selection switch. Can be unnecessary,
The temperature controller could be reduced in size and inexpensive.

[Brief description of the drawings]

FIG. 1 is a block diagram of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a temperature control device for an electric heater according to an embodiment of the present invention.

FIG. 3 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 Switch 4 Heater 6 Control circuit 7 Diode 10 Temperature sensor 11 Power supply circuit

Claims (1)

[Claims] A plurality of switches (2) are connected to a commercial power supply (1).
And one of the heaters (4) is connected to each of the switches (2), and the other of the plurality of heaters (4) is connected to the commercial power supply (1) through the contact of a relay (9). 4) A control circuit (6) connected to the temperature sensor (10) so as to control the energization of the relay (9) based on a detected temperature detected by a temperature sensor (10) in the vicinity, and the control circuit (6) In a temperature control device for an electric heater configured by connecting a power supply circuit (11) for supplying the power to the power supply circuit, each of the plurality of switches (2) and the power supply circuit (11) are connected by a diode (7). A temperature control device for an electric heater characterized by the following.