JPH02230687A - Microwave oven for vehicle mount - Google Patents

Abstract

PURPOSE:To reduce the size and weight by employing a power source for driving a magnetron by stepping up a DC power source by DC-DC converter. CONSTITUTION:A device is constituted with a magnetron 2 capable of being driven with DC current, a drive power source for driving a magnetron 2 by stepping up a DC voltage with a DC-DC converter 3, and a heating chamber 1, each insulated from the magnetron 2. This constitution makes it possible to conduct the positive pole of the magnetron 2 to the positive pole of a battery without insulation, and directly step up the output DC voltage of the battery to be applied to the gap between positive and negative poles of the magnetron 2. As a result, power capacity of the battery can be applied to the magnetron at a high efficiency without requiring a DC-AC converter.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a microwave oven that can be mounted on an automobile or the like.

BACKGROUND OF THE INVENTION Conventional microwave ovens require a step-up transformer to generate this high voltage because the magnetron, which is the source of radio waves, operates at a high voltage of several thousand points.

For this reason, when the drive power source was direct current, a DC/AC converter was used to create alternating current, and the alternating current voltage was boosted by a step-up transformer to obtain the high voltage necessary to drive the magnetron.

Problems to be Solved by the Invention For this reason, for example, when installed in a car, a DC/AC converter is required to convert the DC voltage of the battery to AC, which reduces the power supply efficiency, and the circuit configuration is complicated and large. There was an issue to be solved.

The present invention solves the conventional problems and aims to provide a small and lightweight in-vehicle microwave oven that can be incorporated, for example, into the dashboard of an automobile.

Means for Solving the Problems In order to solve the above problems, the in-vehicle microwave oven of the present invention includes a magnetron that can be driven with a direct current of several hundred volts, and a drive that boosts the direct current voltage with a DC-DC converter to drive the magnetron. The power source and the heating chamber that houses the object to be heated are insulated from the magnetron.

Effects of the present invention With the above-described configuration, the anode of the magnetron and the glass terminal of the automobile battery can be electrically connected without being insulated, and the output DC voltage of the battery can be directly boosted and applied between the anode and cathode of the magnetron. Can be done. Therefore, the power capacity of the battery can be added to the magnetron with high efficiency without requiring a DC/AC converter.

This allows the magnetron to generate greater output power.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Figures 1, 2, and 3, 1 is a heating chamber that stores the object to be heated, 2 is a magnetron that operates at several hundred volts to generate microwaves to supply electricity to the heating chamber, and 3 is a magnetron that drives the magnetron. DC-DC converter, 4 is a waveguide that guides microwaves generated by the magnetron into the heating chamber, 5 is a door that opens and closes the front of the heating chamber, 6 is an operating section, 7 is a power bar for the main body, and 8 is a carrying bar. It's a handle. Reference numeral 9 is a door key, and when this key is operated, the closed door is opened slowly and smoothly.

The waveguide 4 is a waveguide 4a to which Magne 1 Ron is attached.
It is composed of two members: and a waveguide 4b attached to a heating chamber, and each member is fitted and assembled with an insulating member 10 interposed therebetween. The length of this fitting part is 4 times the propagation wavelength of the fitting part, which is obtained based on the internal wavelength of the microwave transmitted in the waveguide and the wavelength compression ratio by the insulating member.
It is made up of one-half the length. Further, 11 is an insulating plate that covers the opening 12 of the waveguide. Since the in-vehicle microwave oven of the present invention has the above-described structure and electrically insulates the magnetron and the heating chamber, the heating chamber can be directly attached to the frame of the automobile. For example, it is possible to incorporate this into the dashboard of an automobile. Furthermore, since the heating chamber and the magnetron are insulated, it is possible to connect the anode side of the magnetron to the automobile battery. Due to this feature and the magnetron drive power supply of the present invention having a configuration as shown in FIG. 4, the magnetron drive power source of the present invention has the structure shown in FIG.

A magnetron that operates at several hundred volts/I/1- has an anode having 16 or more cavity resonators and a cathode disposed concentrically with the anode at the center of the anode.

In Figure 4, 13 is the DC voltage of the battery, 14 is the magnetron, 15 is a DC-DC converter circuit that creates a DC voltage of several hundred volts to be applied between the anode and cathode of the magnetron, and 16 is a circuit that converts electrons from the cathode of the magnetron. A DC- supplying power to heat this cathode for emission.
A DC converter circuit, 17 is a door switch that closes when the door is closed, and 18 is each DC-DC converter circuit when heating is performed based on the closing signal of the door switch and each signal input from the operation unit. A control circuit that operates a magnetron by controlling the operation of a semiconductor element that is a component of 19. 20 is a waveguide, 21 is a heating chamber, and 22 is an object to be heated.

Due to the above-described drive circuit configuration, the in-vehicle microwave oven of the present invention does not require the AC power supply that was required to drive conventional microwave ovens of this type, so the drive circuit configuration is simplified and the drive circuit is made smaller and lighter. Since a DC/AC converter or a DC/AC converter is not required, there is no conversion loss conventionally caused by these converters, and the efficiency of the drive power supply section can be increased.

Note that when the microwave oven is attached and assembled to the main body of a car, the above-mentioned drive circuit does not need to be built into the main body of the microwave oven, and may be placed anywhere as long as there is little wiring loss and it is easy to mount.

Note that the microwave oven of the present invention is not limited to automobiles, and can of course be applied to aircraft, ships, and others.

Effects of the Invention As described in section 2, the in-vehicle microwave oven of the present invention provides the following effects.

(1) Since the Magne 1 Ron and the heating chamber are electrically insulated, the heating chamber can be directly attached to the frame of an automobile or the like.

(2) Since the magnetron is driven by directly boosting the DC voltage, the efficiency of the drive power supply section can be increased.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a vehicle-mounted microwave oven showing an embodiment of the present invention, Fig. 2 is a configuration diagram of the main body power bar seen through, Fig. 3 is a sectional view of the main parts, and Fig. 4 is a block diagram of the same drive power supply circuit. 1, 21... Heating chamber, 2.14... Magnetron, 3, 15, 1 6-=-DC-DC
:2 7/<-ta, 10...Insulating member.

Claims (1)

[Claims] a heating chamber that stores an object to be heated; a magnetron that generates microwaves to be supplied with power to the heating chamber; a drive power source that boosts a DC power source with a DC-DC converter to drive the magnetron; and the heating chamber and the magnetron. and a means for insulating the microwave oven.