JPH0142317Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Purpose of the invention [Field of industrial application] This invention relates to a current control circuit used when a plate-shaped heating element whose current is stabilized by heating is used as a heat source. It is something. Such a current control circuit is used, for example, in a panel heater.

[Prior Art] Generally, in a circuit where the heat source is a plate-shaped heating element whose current is stabilized by heating, the current is stabilized at point B until the current stabilizes at point A as shown in Figure 4. It requires a large amount of electricity.

Therefore, as shown in FIG. 5, one circuit 25, in which a plate-shaped heating element 23 and a switch 24 are connected in series, and a plate-shaped heating element 26 and a switch 27 are connected in series to an AC power source 22. It is conceivable to connect the other circuit 28 in parallel and divide the heating element circuit.

[Problems to be solved by the invention] However, as in the circuit shown in Fig. 5, it is possible to switch about half of the total current by dividing the circuit of the plate-shaped heating element using switches 24 and 27. However, this does not solve the problem because only half of the capacity of the plate heating element is activated.

This idea was made in view of the above circumstances, and it is possible to stabilize the current well without requiring a large current to stabilize the current, and it is possible to miniaturize the circuit components. The object of the present invention is to provide a current control circuit for a plate-shaped heating element.

(b) Structure of the invention [Means for solving the problem] In response to this purpose, the current control circuit for the plate-shaped heating element of this invention consists of one heating section circuit having a heating member, and a circuit between the heating member and the heating element. and the other heat generating part circuit having a detection switch connected in parallel, and the heat detecting part of the heat detecting switch is installed in a position where heat can be transferred to the heat generating member of the one heat generating part circuit,
It is characterized in that the heat generating member of the one heat generating circuit and the other heat generating circuit are assembled at a position where heat can be transferred.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

In FIG. 1, 1 is a current control circuit, and the current control circuit 1 connects one heat generating part circuit 5 and the other heat generating part circuit 8 to an AC power supply 2 in parallel.

One heat generating circuit 5 includes a plate-shaped heat generating member 3 and a switch 4 in series, and the other heat generating circuit 8 includes a plate-shaped heat generating member 6, a heat detection switch 11, and a switch 7 in series. There is. The plate-shaped heat generating member 3 and the plate-shaped heat generating member 6 are assembled into a plate-shaped heat generating body 12.

The heat detection part of the heat detection switch 11 is a plate-shaped heating element 12
It is arranged in a heat transfer relationship with the plate-shaped heat generating member 3 of one of the heat generating circuits 5 via.

[Function] In the current control circuit 1 configured as described above, when the switches 4 and 7 are closed, a current flows through the heat generating section circuit 5 (B-Y circuit) on one side of the plate-shaped heating element, and this plate-shaped heating element Due to its nature, a current larger than the rated power consumption flows. This point is point a in FIG.
Therefore, the plate-shaped heating element 12 is gradually heated, and when the temperature rises to the operating temperature of the heat detection switch 11, the heat detection switch 11 closes and the other heating part circuit 8 (B-R circuit) of the plate-shaped heating element 12 is connected. current begins to flow. This point is designated as b in FIG. At this time, the plate-shaped heat-generating member 6 of the other heat-generating circuit 8 (B-R circuit) is already on the same plate and heated by the plate-shaped heat-generating member 3 of the one heat-generating circuit 5 (B-Y circuit). Therefore, the current is mostly stable. Since all the circuits of the plate-shaped heating element 12 are closed in this way, one of the heating section circuits 5
It is heated more than the heat generated by the (B-Y circuit), and the total current flowing through the circuit becomes more stable. This point is c in FIG.

Figure 3 compares the amount of power shown in Figure 2 with the amount of power shown in Figure 4. Only the shaded area in Figure 3 shows that in the control circuit of this invention, until stability is reached, It can be seen that the amount of electricity is small.

(c) Effects of the invention As is clear from the above explanation, this invention has the following effects:
By inserting a heat-sensing switch, the time required for the plate-shaped heating element to heat up to the operating temperature of the heat-sensing switch is delayed, and due to the synergistic effect of heating the heat-generating part that is not operating with half of the heating element. It is possible to obtain a current control circuit for a plate-shaped heating element that functions without flowing current all at once, greatly reduces power consumption, and allows the components in the circuit to be miniaturized.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of the current control circuit of this invention, Figure 2 is a graph showing the required power amount, Figure 3 is a graph showing a comparison of the required power amount, and Figure 4 is the required power of the conventional current control circuit. A graph showing the amount, and FIG. 5 are a circuit diagram showing a conventional current control circuit. 1...Current control circuit, 2...AC power supply, 3...
Plate-shaped heating element, 4... switch, 5... one heat generating circuit, 6... plate-shaped heat generating member, 7... switch,
8...Other heat generating circuit, 11...Heat detection switch, 12...Plate heating element.

Claims (1)

[Scope of utility model registration request] One heat generating circuit having a heat generating member and the other heat generating circuit having a heat generating member and a heat detecting switch are connected in parallel, and the heat detecting unit of the heat detecting switch is connected to the heat generating circuit of the one heat detecting switch. A plate-shaped plate, characterized in that the heat generating member of the one heat generating circuit and the other heat generating circuit are incorporated in a position where heat can be transferred to the heat generating member of the heat generating circuit. Current control circuit for heating element.