JPS6343829Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control device for electric heaters such as electric heating carpets, electric blankets, electric blankets, and electric stoves. The purpose of this invention is to appropriately switch the selection according to the situation and control the necessary heat-generating resistive load by energizing it.

2. Description of the Related Art Conventionally, for example, a control device for an electric heater, which has a plurality of heat generating resistive loads, is as shown in FIG. In FIG. 1, 1 is an AC power source, and a series circuit with a relay drive device 10 is connected to both ends of this AC power source 1 via a power switch 2 and a rectifying element 14, and the relay drive device 10 operates to open and close. A relay switch 3 is connected to the midpoint between the power switch 2 and the rectifying element 14, and the relay switch 3 is connected to a plurality of selection changeover switches 4, 5, 6, etc., each of which is connected to a heating resistor, as appropriate. A circuit in which loads 7, 8, and 9 are connected in series is connected in parallel, and the selection switch 4,
5, 6 and heat generating resistive loads 7, 8, 9, the other end of the parallel circuit is connected to the AC power supply 1 side. Since there is a switch section that requires two operations, the switch 2 and the selection changeover switches 4, 5, and 6, it is inconvenient for the user to have to operate the switch twice. In addition, a plurality of heat generating resistive loads 7,
Since the parallel circuit consisting of the selection changeover switches 4, 5, 6, etc. connected in series with the selection changeover switches 8 and 9 is energized by one common relay switch 3 of these circuits, the selection changeover switches 4, 5,
The disadvantage is that the heat-generating resistive loads 7, 8, and 9 are controlled simultaneously regardless of whether the relay switch 6 or the like is open or closed, and the load voltage applied to the relay switch 3 fluctuates greatly.

The present invention aims to overcome the above-mentioned drawbacks, and includes a circuit in which a heat-generating resistive load is connected in series to both ends of an AC power source via the contacts of a relay switch that is opened and closed by a relay drive device. A plurality of rectifiers are connected in parallel, and a rectifying element having the same polarity direction is connected between the midpoint between the selection changeover switch and the relay switch of the parallel-connected circuit and the terminal of the relay drive device. The present invention provides a control device for an electric heater in which another terminal is connected to a parallel circuit having a relay switch for controlling the heat generating resistive load.

The present invention will be explained below based on drawings showing an example of implementation.

In FIG. 2, 1 is an AC power supply, and a heat generating resistive load 7 is connected to both ends of the AC power supply 1 through a first contact 11 of a relay switch 3 which is opened and closed by a relay drive device 10 and is connected to a selection changeover switch 4. A relay switch 3 which is opened and closed by a relay drive device 10 is connected to a selection changeover switch 5.
A series circuit in which the heat generating resistive load 8 is connected through the second contact 12 of the switch 6 and the heat generating resistive load 9 is connected to the selection changeover switch 6 through the third contact 13 of the relay switch 3 which is opened and closed by the relay drive device 10. series circuits, etc., are connected in parallel, and the heat-generating resistive load 7, which constitutes the parallel circuit,
The first contact 11 of the selection changeover switch 4 and the relay switch 3 of the series circuit that control 8 and 9 respectively, and the second contact 1 of the selection changeover switch 5 and the relay switch 3
2, the respective midpoints of the selection changeover switch 6 and the third contact 13 of the relay switch 3, and the relay drive device 1
Rectifying elements 1 with the same polarity direction between the terminals of 0 and 0
4, 15, and 16 are connected in parallel, and the other terminal of the relay driving device 10 and the heat generating resistive load 7,
8 and 9 are connected to a parallel circuit having a relay switch 3 for controlling each of the terminals 8 and 9.

Next, the operation in the above configuration will be explained.

First, when the selection selector switches 4, 5, and 6 connected to the AC power source 1 are closed, they are less affected by fluctuations in the power supply through the rectifying elements 14, 15, and 16, which are connected in parallel. A stable, rectified power supply is supplied to the relay drive device 10.

Next, by energizing the relay drive device 10,
The first contact 11 and the second contact 1 of the relay switch 3 are connected in parallel to the selection changeover switches 4, 5, and 6, respectively.
2. When the third contacts 13, etc. are properly closed at the same time, a plurality of connected heat generating resistive loads 7,
8 and 9 are energized and heat is generated. If you want to energize only the necessary heat-generating resistive loads using the selector switches for the heat-generating resistive loads 7, 8, and 9, for example, by opening the selector switches 5 and 6, you can close only the selector switch 4. The state is maintained, and only the heat generating resistive load 7 connected to the switch is energized and generates heat.

As detailed above, the present invention connects a plurality of circuits in parallel to both ends of an AC power source, each of which has a heat-generating resistive load connected in series through the contacts of a selector switch and a relay switch that is opened and closed by a relay drive device.
A rectifying element having the same polarity direction is connected between the midpoint between the selection switch and the relay switch of the parallel connected circuit and the terminal of the relay driving device, and the other terminal of the relay driving device and the heating resistor are connected. By using a control device for an electric heater that is connected to a parallel circuit with a relay switch that controls the load, it is possible to select and switch among multiple heat-generating resistive loads as needed to create the required heat-generating resistive load. The user can heat the necessary area by simply switching the selection switch, and since each relay switch contact is connected to a heat-generating resistive load, the load voltage can be controlled. This is beneficial because it reduces the influence of fluctuations in

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a control device for an electric heater showing an embodiment of the conventional technology, and FIG. 2 is an electric circuit diagram of a control device for an electric heater showing an embodiment of the present invention. 1...AC power supply, 3...Relay switch, 4~
6... Selection changeover switch, 7-8... Heat generating resistive load, 10... Relay drive device, 11-13... Contact portions of relay switch, 14-16... Rectifying element.

Claims (1)

[Scope of utility model registration request] A selection switch 4 is provided at both ends of the AC power supply 1.
A plurality of series circuits in which heat-generating resistive loads 7, 8, and 9 are connected to terminals 5 and 6 through contacts 11, 12, and 13 of a relay switch 3 that is opened and closed by a relay drive device 10 are connected in parallel, and these parallel circuits are connected in parallel. the series circuit selection switch 4,
A rectifying element 1 in the same polarity direction is connected between the midpoint between 5 and 6 and the relay switch 3 and the terminal of the relay drive device 10.
4, 15, 16 and its relay drive device 1
A control device for an electric heater, characterized in that the other terminal of the electric heater 0 is connected to a parallel circuit having a relay switch 3 for controlling the heat generating resistive loads 7, 8, and 9.