JPH0650671B2 - High frequency heating device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high-frequency heating device for heating foods, liquids and the like by so-called dielectric heating of microwave ovens and so-called induction heating of electromagnetic cookers and the like. .

2. Description of the Related Art Various types of high-frequency heating devices of this type have been proposed to reduce the size, weight and cost of the power supply circuit.

FIG. 2 (a) is a circuit diagram of a conventional inverter microwave oven, and FIG. 2 (b) is a circuit diagram of a conventional electromagnetic cooker.

FIG. 3 is an external perspective view showing a conventional example in which the electric components shown in FIGS. 2 (a) and 2 (b) are arranged on a printed circuit board.

A voltage of about 600 V peak is applied to the switching elements and capacitors of FIGS.
As shown in the figure, when arranging electrical parts on the printed circuit board,
A sufficient distance between terminals was taken and sufficient insulation was provided for each electric component.

Further, the fin for cooling the switching element such as the transistor has the same potential as the collector potential of the transistor. For this reason, the support tool for supporting the heavy fin is made of an insulating material.

Problems to be Solved by the Invention However, such a conventional high-frequency heating device has the following problems.

First, it is necessary to secure a sufficient distance between terminals in order to arrange the electric parts on the printed circuit board, the printed circuit board becomes large, and the high frequency heating device cannot be made small, lightweight and low cost.

Secondly, because non-power components such as capacitors and power components such as switching elements are placed on the same printed circuit board,
Non-power components are subject to heat interference from power components.

Thirdly, since the individual parts are insulated, the cost of the insulating material and the number of steps are increased, and the parts become large, so that the high-frequency heating device cannot be made small, lightweight and low in cost. There were problems such as.

The present invention solves such a conventional problem, and provides a circuit having a simple structure and a small size without thermal interference.

Means for Solving the Problems The present invention has been made to eliminate the above-mentioned conventional drawbacks, and has the following structure.

In a high-frequency heating device provided with a power supply section obtained from a commercial power supply or the like and a frequency converter for converting the frequency thereof to a higher frequency, the power supply section and the frequency converter are configured as follows. That is, from a first circuit block in which electrical components including capacitors and the like that consume less power are molded with an insulating material, and from a second circuit block that includes radiating fins in which electrical components with high power consumption such as switching elements are molded with an insulating material. By reducing the insulation distance between individual electric components, the size is reduced, and by eliminating the insulation of individual electric components, the number of man-hours is reduced and the cost is reduced. By separating the parts, it is configured to prevent heat interference.

Action The present invention has the following actions with the above configuration.

In other words, the power supply unit obtained from the commercial power supply and the frequency converter that converts the commercial frequency to a higher frequency are molded with an insulating material to reduce the size of the circuit block.
Achieving low cost and preventing heat interference by separating the circuit block into a circuit block for electrical components with high power consumption and a circuit block for electrical components with low power consumption Is.

Embodiment One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1 (a), a plurality of electric components excluding the insulation of a single component from an electric component that consumes less power, such as a capacitor of a high frequency heating device, is molded with an insulating material.
The circuit block 10 is formed.

Similarly, as shown in Fig. 1 (b), multiple electrical components, such as switching elements of a high-frequency heating device, that consume a lot of power, excluding the insulation of individual components, are molded with an insulating material to dissipate heat. Second with fin 11 for
The circuit block 12 is formed.

In this way, it is possible to remove the insulation of the component by itself, so that the component can be downsized and a compact circuit block can be configured, and the entire part is covered with an insulating material. Since the terminals are not exposed, the safety is high, and even when the circuit block is attached to the main body of the high-frequency heating device, the attachment for insulating the main body from the main body is not required, and the work efficiency can be remarkably improved.

In addition, since the electrical components with low power consumption and the electrical components with high power consumption can be separated, heat is not transferred from the second circuit block with high power consumption to the first circuit block with low power consumption, and the reliability of the circuit is improved. You can improve your sex.

It should be noted that the first circuit block 10 of FIG.
It is preferable to include the control section 7 shown in (b) because a more compact high frequency heating device can be realized.

EFFECTS OF THE INVENTION As described above, the present invention provides a high-frequency heating device including a power supply unit obtained from a commercial power supply and the like, and a frequency converter for converting a commercial frequency to a higher frequency. The first circuit block, in which electrical components with low power consumption, such as capacitors, are molded with an insulating material, and electrical components with high power consumption, such as switching elements, are molded with an insulating material, and fins for heat dissipation are attached. By configuring from 2 circuit blocks,
It is possible to provide a high-frequency heating device that is compact and low-cost, and that can prevent heat interference between an electrical component that consumes a large amount of power and an electrical component that consumes little power.

[Brief description of drawings]

FIG. 1 (a) is an external perspective view of a first circuit block of a high-frequency heating apparatus according to an embodiment of the present invention, FIG. 1 (b) is an external perspective view of the same second block, and FIG. 2) is a circuit diagram of a conventional inverter microwave oven, FIG. 2B is a circuit diagram of a conventional electromagnetic cooker, and FIG. 3 is an external perspective view of a circuit of the same range or electromagnetic cooker. 10 ... First circuit block, 11 ... Fin, 12 ...
… Second circuit block.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Niwa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Takahiro Matsumoto 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Kei Kusunoki 1006 Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Takeo Shimotani, 1006, Kadoma, Kadoma City, Osaka, Matsushita Electric Industrial Co., Ltd. (56) References 49-87280 (JP, A) Actual opening Sho 61-177390 (JP, U) Actual opening Sho 55-105953 (JP, U)

Claims (1)

[Claims] 1. A power supply unit and a frequency converter that converts the frequency of the power supply unit to a higher frequency, and insulates a plurality of electric components with low power consumption between the power supply unit and the frequency converter. High-frequency heating composed of a first circuit block molded with a material and a second circuit block in which a plurality of electric components with large power consumption are molded with an insulating material and fins for heat dissipation are attached apparatus.