JPS637672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an induction heating cooker used in general households.

Conventional Structure and its Problems The structure of a conventional induction heating cooker generally used for home use is shown in FIG.
This figure shows a single-cooker induction heating cooker with the top plate (pan plate) removed. 1 is the power switch, 2 is the power control unit, 3 is the cooling fan, and 4 is the Heating coil, 5 is the main semiconductor part, 6
7 is a high frequency oscillation capacitor, 7 is a power supply control board, 8 is a high frequency oscillation control board, and 9 is a power supply noise prevention coil.

This Chiyoke coil 9 is made by winding an EI type iron core, and is usually large in shape, high in cost, and heavy in weight, which is a major impediment to the low cost, light weight, and thinness of induction heating cooker products. It was becoming.

OBJECT OF THE INVENTION The present invention aims to solve these problems.

Composition of the Invention The induction heating cooker of the present invention includes a heating coil that generates a high-frequency magnetic field for inductively heating an object to be heated, a high-frequency oscillation section that supplies a high-frequency current to the heating coil, and a high-frequency oscillation section that is A power supply section that supplies frequency or DC power, a control circuit section that controls the high frequency oscillation section, and a housing section that houses these, and windings are applied to this housing section so that the inside of the high frequency oscillation section or The structure includes an inductor located within the power supply section.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments will be described with reference to the accompanying drawings.

In FIG. 2, 10 is a power switch, 11 is a power control unit, 12 is a cooling fan, 1
3 is a heating coil, 14 is a main semiconductor section, 15 is a high frequency oscillation capacitor, 16 is a power supply control board, 1
7 is a control board for high frequency oscillation, 18 is an inductor for preventing power supply noise, and 19 is a housing. The circuit configuration is shown in Figure 3. 20 is a full-wave rectifier, and 21 is a power transformer, which are placed on the power supply control board 16. 22 is a control circuit; control board 1 for high frequency oscillation;
It is configured on 7. 23 is a power supply capacitor,
24 is a resonance capacitor, which corresponds to the high frequency oscillation capacitor 15 in FIG. The power supply noise prevention inductor 18 is arranged around the inner wall of the housing 19 .

Furthermore, a diode 26 and a transistor 27 are arranged in the main semiconductor section 14 of FIG. 2. 2
9 is a top plate placed on the heating coil 13, and 30 is a pot for heating the object.

In the above configuration, when the power switch 10 is turned on, the full-wave rectifier 20 causes the power supply capacitor 23 to
A DC voltage is applied across the terminal.

In this state, the control circuit 22 sends the transistor 2
When base current is supplied to 7 at predetermined intervals, heating coil 13, resonance capacitor 24, power supply capacitor 23, diode 26, transistor 27
A high frequency current flows through the heating coil 13 due to the resonance loop of the pan 30 placed on the heating coil 13.
will be heated by induction.

Although the inductor 18 can operate without being inserted, it is indispensable in practice to prevent radio wave interference caused by the above-mentioned resonance current and voltage harmonics, and usually has a value of several hundred μH. It is becoming.

In this embodiment, the inductor 18 is constructed by going around the inner circumference of the casing 19, and the larger the diameter, the more
Since a large inductance can be obtained, it is constructed as close to the outer periphery as possible.

In addition, in order to meet the purpose of noise reduction, the winding direction is such that the direction of the magnetic field of the high frequency component generated by the heating coil 13 and the high frequency component flowing through the inductor 18 cancel each other out. ing.

With this configuration, a noise reduction effect can be obtained with a smaller inductance than that of the conventionally used chi-yoke coil, which can greatly contribute to cost reduction.

Effects of the Invention As described above, according to the configuration of the present invention, compared to the conventional method using a chiyoke coil, an inductor can be constructed by simply winding the wire without using a core material, and the shape can be changed over the entire cooking device. This means that it is possible to realize an extremely innovative induction heating cooker that not only can be made thinner, but also contributes to weight reduction, and also has an increased noise reduction effect.

Note that the inductor can be constructed without having to go around the inner wall of the housing, it can be placed around the outer circumference of the housing as long as the insulation structure is taken into account, or it can be integrally molded with the housing. It is.

Furthermore, it is possible to configure it close to the heating coil, and in fact, it can be configured freely depending on the arrangement of each component.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the arrangement of parts of a conventional induction heating cooker, Fig. 2 is a plan view showing the arrangement of parts of an induction heating cooker according to an embodiment of the present invention, and Fig. 3 is a plan view showing the arrangement of parts of an induction heating cooker according to an embodiment of the present invention. FIG. 11...Power control section, 13...Heating coil, 15...Capacitor for high frequency oscillation, 18
...Inductor, 19 ... Housing, 20 ... Full-wave rectifier, 22 ... Control circuit, 26 ... Diode,
27...transistor.

Claims (1)

[Scope of Claims] 1. A heating coil that generates a high-frequency magnetic field for induction heating of an object to be heated, a high-frequency oscillation section that supplies a high-frequency current to the heating coil, and a commercial frequency or DC power supply to the high-frequency oscillation section. a power supply section that supplies a power source; a control circuit section that controls the high frequency oscillation section;
The heating coil, the high-frequency oscillation section, the power supply section, and the control circuit section are housed in a housing section, and at least one of the inductors located in the high-frequency oscillation section or the power supply section is housed in the housing. An induction heating cooker constructed by winding the parts. 2. Induction heating cooking according to claim 1, wherein the high frequency component of the magnetic field generated by the inductor configured by winding the casing and the high frequency magnetic field generated by the heating coil cancel each other out. vessel.