JPS62119891A - Induction heating cooker inverter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an inverter for an induction cooking device used in general households.

2. Description of the Related Art A conventional inverter for an induction heating cooker is shown in FIG. This connects a series circuit of an inductor 2, a heating coil 3, and a first resonant capacitor 4 to the DC current #1, and connects a second resonant capacitor 6 to the series circuit of the heating coil 3 and the first resonant capacitor 4. A control circuit 7 is connected in parallel to the second resonant capacitor 5.
A switching element 6 controlled by is connected thereto. FIG. 6 is an operation waveform diagram of the operation. is an on-current of the switching element 6, vam is an off-voltage, and Q is a waveform indicating whether the switching element 6 is turned on or off.

Problems to be Solved by the Invention Although the operation of this type of inverter is very stable as shown in FIG. 5, the inductor 2 connected in series with the DC power supply 1 has a relatively large capacity. This requires a large space and a high price, so it has not been realized as an inverter for general household induction heating cookers.

The present invention has been made in view of this point, and an object of the present invention is to provide an inverter for an induction heating cooker that is small and inexpensive.

Means for Solving All Problems In order to solve the above problems, the inverter for induction heating cookers of the present invention connects a series circuit of a first heating coil, a second heating coil, and a first resonant capacitor to a DC power source. , a second resonant capacitor is connected between the connection point of the first heating coil and the second heating coil and the DC power supply;
In this configuration, a switching element is connected in parallel to a series circuit of the heating coil and the first resonant capacitor.

Effects of the present invention With the above configuration, the part where the inductor was conventionally disposed is made a part of the heating coil, and the high frequency component of the current applied to the inductor contributes to heating, thereby making the device itself smaller and cheaper. will be realized.

Embodiment FIG. 1 shows an embodiment of the inverter for an induction heating cooker according to the present invention. In FIG. 1, a DC power supply 11, a first heating coil 12, a second heating coil 13, and a first resonant capacitor 14 are connected in series, and the first heating coil 12 and the second heating coil 14 are connected in series. A second resonant capacitor 16 is connected between the connection point with the heating coil 13 and the negative side of the DC power source.
and a switching element 1 connected in parallel to the series circuit of the second heating coil 13 and the first resonant capacitor 14.
6 is connected. A control circuit 17 controls on/off of the switching element 16.

The operation of the embodiment shown in FIG. 1 is similar to the operation waveform diagram of FIG. 6 shown in the conventional example, and the first heating coil 12
The high frequency component of the current applied to the current contributes to heating.

Next, a second embodiment of the present invention is shown in FIG.

A second resonant capacitor 16 shown in FIG. 1 is connected between the connection point of the first heating coil 12 and second heating coil 13 and the positive side of the DC power supply 11. It is clear that the same effects as in the first embodiment can be obtained with this connection as well.

Further, a third embodiment of the present invention is shown in FIG.

The first heating coil 12 and the second heating coil 13f shown in FIG. 1 are arranged on a concentric circle, and if the intermediate tap method is used as shown in FIG. 3, the first heating coil 12 and the second heating coil 13f shown in FIG. Second heating coil 12
．． 13 becomes a negative part, the number of parts is reduced, and it is small and
It is possible to reduce the price.゛Effects of the Invention As described above, according to the present invention, by providing the first heating coil which also serves as an inductor, it is possible to realize a stable operation inverter for an induction heating cooker in a small size and at a low cost. The effect is like a dog.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an inverter for an induction cooking device according to an embodiment of the present invention, FIGS. 2 and 3 are circuit diagrams of an inverter for an induction cooking device according to another embodiment of the invention, and FIG. FIG. 6 is a circuit diagram of a conventional inverter for an induction heating cooker, and FIG. 6 is an operating waveform diagram of FIG. 4. 11...DC power supply, 12...First heating coil, 13...Second heating coil, 14.
...First resonant capacitor, 16...Second resonant capacitor, 16...Switching element. Name of agent: Patent attorney Toshio Nakao and 1 other person +1
・-Lkotfi 11! -Ichiminefqtm@yil+5- Book 1 ・fG---St, Toshi 71 To 2nd Figure 3

Claims (2)

[Claims] (1) Connect a series circuit of a first heating coil, a second heating coil, and a first resonant capacitor to a DC power source, and
A second resonant capacitor is connected between the connection point of the heating coil and the second heating coil and the DC power supply, and a switching element is connected in parallel to the series circuit of the second heating coil and the first resonant capacitor. Connected inverter for induction heating cooker. (2) The inverter for an induction heating cooker according to claim 1, wherein the first heating coil and the second heating coil are arranged on a concentric circle.