KR100659612B1 - Microwave oven using AC and DC electric powers - Google Patents

Abstract

The present invention relates to an alternating current and direct current microwave oven that can be driven by both a direct current power source (DC) or an alternating current source (AC). The microwave oven includes: a DC power supply unit having a DC power input terminal for inputting a DC power source and a DC / AC converter for outputting DC power from the DC power input terminal to an AC power source; An AC power supply unit having an AC power input terminal for inputting AC power; And a first side coil portion configured to input an AC voltage applied from the DC power supply portion, and a second primary side coil portion to input an AC voltage applied from the AC power supply portion, and a high voltage to drive the magnetron. And a transformer comprising a secondary side coil portion configured to induce a first secondary side coil portion and a filament coil portion to supply a filament voltage for driving the magnetron.

Microwave, AC, DC, Combined

Description

Microwave oven using AC and DC electric powers}             

1 is a drive circuit diagram of a microwave and direct current microwave oven according to an embodiment of the present invention; And

2 is a driving circuit diagram of a microwave and direct current microwave oven according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

HVT: High Pressure Transformer MGT: Magnetron

10: primary side coil portion 20: secondary side coil portion

100: AC power supply 200, 300: DC power supply

The present invention relates to a microwave oven, and more particularly to an electric microwave combined use of alternating current and direct current.

In general, a microwave oven is a device for cooking food using microwaves, and is provided with a high voltage transformer and a magnetron. The high voltage transformer boosts the normal voltage to a high voltage, and the magnetron is driven at this high voltage to oscillate microwaves of a predetermined frequency.

Since such high voltage transformers are usually designed to be driven by AC power only, they cannot be used in outdoor places where ships cannot supply AC power, or in ships, aviation and other means of transportation. There is a problem.

In order to solve this problem, it is driven by a DC power source such as a battery in a place where it is not possible to supply AC power by using an inverter that converts the DC power supply to AC power and supplies the high voltage transformer. You need a microwave oven.

On the other hand, it is possible to supply AC power, but if there is no battery, it is necessary to use a microwave oven to convert the commercial AC power to high frequency AC power.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide an AC and DC combined microwave oven that can be driven by the AC power and DC power as needed.

In order to achieve the above object, the AC and DC combined microwave oven according to the present invention,

A DC power supply unit having a DC power input terminal for inputting DC power and a DC / AC converting unit for outputting DC power from the DC power input terminal to AC power;

An AC power supply unit having an AC power input terminal for inputting AC power;

A primary coil portion comprising a first primary coil portion for inputting an AC voltage applied from the DC power supply portion and a second primary coil portion for inputting an AC voltage applied from the AC power supply portion, and inducing high voltage to drive the magnetron; And a transformer comprising a secondary side coil portion including a first secondary side coil portion and a filament coil portion for supplying a filament voltage for driving the magnetron.

DC / AC conversion unit of the DC power supply of the microwave oven,

A voltage / frequency converter for generating a voltage pulse of a constant frequency in response to the input voltage of the DC power supply; And

An inverter including a push-pull circuit for applying an alternating voltage to the primary coil of the high-voltage transformer is turned on and off alternately in response to the voltage pulse.

DC / AC conversion unit of the DC power supply of the microwave oven,

A plurality of brushes connected to a DC power source; And

It is a rotary inverter including a commutator for converting the DC waveform input from any one of the brushes to the AC waveform by the rotation operation to output.

The AC voltage applied from the DC power supply unit to the first primary side coil unit and the AC voltage applied from the AC power supply unit to the second primary side coil unit are both within the range of 50 to 80 Hz.

 According to the AC and DC combined microwave oven as described above, each AC voltage induced from the AC power supply unit 100 and the DC power supply unit 300 is the first primary side coil of the primary coil unit 10 of the high-voltage transformer (HVT) 14 and the second primary side coil 12, respectively, and the applied voltage is boosted by the first secondary side coil unit 22 to induce a high voltage, and the induced high voltage is applied to the first secondary side nose. It is configured to operate the magnetron MTG by the operation of the part 22 and the filament coil portion 24. That is, the microwave oven according to the present invention is designed to be driven by both the DC power source (DC) or AC power source (AC), the outdoor place or ship, air and other transportation that can not supply AC power (AC) The means uses a direct current power source (DC), such as a battery, to drive the microwave. On the other hand, it can supply AC power, but if there is no battery, it converts the commercial AC power source to high frequency AC power. It becomes possible.

Hereinafter, an alternating current and direct current microwave oven according to embodiments of the present invention will be briefly described with reference to the accompanying drawings. Embodiment 1 is a diagram showing a case where the DC / AC conversion unit of the DC power supply unit is a rotary inverter, Example 2 is a diagram showing a case where the DC / AC conversion unit of the DC power supply unit is an inverter using a push-pull circuit.

Example 1

1 is a driving circuit diagram of an alternating current and direct current microwave oven according to the first embodiment of the present invention, in which the DC / AC converter is a rotary inverter.

Referring to FIG. 1, the AC power supply unit 100 of an AC and DC combined microwave oven according to the present invention has an AC power input terminal for inputting AC power AC. As the AC power source AC, a commercial voltage of 120 V or 220 V and a commercial frequency of 50/60 Hz are used.

The DC power supply unit 200 has a DC power input terminal for inputting DC power DC, and has a rotary inverter as a DC / AC converter to output DC power DC from the DC power input terminal to AC power. .

The rotary inverter is driven by a direct current power source (DC) to generate a rotational force (not shown), the communicator 230 rotated by the motor, and the outer peripheral surface of the communicator 230 are in contact with all sides. It has a plurality of brushes (221 ~ 224). The communicator 230 has a conductive portion 132 divided into two or more even poles such that an insulating portion 231 having a predetermined width is formed on the circumferential surface of the cylindrical body. The conductive portion 132 is in contact with two or more brushes adjacent to each other at the same time. DC power supply (DC) is applied to the input side of the brush, the high-voltage transformer (HVT) is installed on the output side. The first and second relays RY1 and RY2 turn on / off the operation of the rotary inverter.

Thus, as the commutator 230 is rotated by the driving of the motor, the brushes 221 to 224 which are in contact with the outer circumferential surface of the commutator 230 are different from each other on the outer circumferential surface of the commutator 230. The AC voltage is supplied by sequentially contacting each position. The frequency of the AC voltage supplied as described above is about 70 Hz, which is similar to the frequency of the AC voltage induced by the AC power supply unit 100 by adjusting the rotation speed of the communicator 230.

The primary side coil unit 10 of the high voltage transformer HVT receives the first primary side coil 14 for inputting the AC voltage applied from the DC power source 200 and the AC voltage applied from the AC power source 100. It is composed of a second primary side coil 12 to input, the secondary side coil portion 20 of the high voltage transformer (HVT), the first secondary side coil portion 22 for inducing high pressure in order to drive the magnetron (MGT). ) And a filament coil unit 24 for supplying a filament voltage for driving the magnetron MTG.

Accordingly, each AC voltage induced from the DC power supply unit 200 and the AC power supply unit 100 may include the first primary side coil 14 and the second primary side coil 14 of the primary side coil unit 10 of the high voltage transformer HVT. 12, respectively, and the applied voltage is boosted by the first secondary coil unit 22 to induce a high voltage. The induced high voltage actuates the magnetron MTG by the operation of the first secondary side coil portion 22 and the filament coil portion 24.

The microwave is generated by the operation of the magnetron (MGT), and thus the microwave oven is operated. The high voltage is induced to the secondary coil unit 20 of the high voltage transformer HVT by the AC voltage applied to the primary coil unit 10.

The magnetron MTG is driven by the induced high voltage, and microwaves are generated according to the driving of the magnetron.

For reference, although not shown, an external AC input unit for inputting commercial AC power to the AC power supply unit 100 and a DC power supply DC to the DC power supply unit 200 are not shown. An external DC input unit is provided for input.

Example 2

FIG. 2 is a driving circuit diagram of an alternating current and direct current microwave oven according to a second embodiment of the present invention, in which the DC / AC conversion unit of the DC power supply unit is an inverter using a push-pull circuit. The rest of the configuration except for the DC / AC conversion unit is the same as that of the first embodiment, and the same reference numerals are used for the same configuration.

Referring to FIG. 2, the AC power supply unit 100 of the AC and DC microwave oven according to the present invention has an AC power input terminal for inputting AC power AC. As the AC power source AC, a commercial voltage of 120 V or 220 V and a commercial frequency of 50/60 Hz are used.

The DC power supply unit 300 has a DC power input terminal for inputting DC power DC as in the first embodiment. In addition, the DC power supply unit 300 applies an inverter using a push-pull circuit as a DC / AC converter to output DC power DC from the DC power input terminal to the AC power.

Reference numeral DSW denotes a door switch of a microwave oven, CC denotes a pulse width modulation control circuit, FET1 and FET2 denote field effect transistors, R1 to R6 denote resistors, and DC denotes a DC power supply such as a battery. Indicates. Reference numerals HVT, HVC, and HVD denote high voltage transformers, high voltage capacitors, and high voltage diodes, respectively, and reference numeral MGT denotes magnetrons. The field effect transistors FET1 and FET2 form a push-pull circuit.

In the microwave oven having the above configuration, when the DC power supply DC is supplied, the door switch DSW of the microwave oven is turned on or off when the door of the microwave oven is closed or opened. When the door switch DSW of the microwave oven is turned on, operating power is supplied to the pulse width modulation control circuit CC. In this case, the pulse width modulation control circuit CC generates a constant frequency according to the voltage. The generated frequency is supplied to the field effect transistors FET1 and FET2 via resistors R1 and R2, respectively. Accordingly, the field effect transistors FET1 and FET2 alternately turn on and off. At this time, the DC voltage DC, for example, the voltage of the battery of the vehicle is alternately applied to the primary coil of the high voltage transformer HVT in the direction of the arrow I (II) to supply the AC voltage. .

The frequency of the AC voltage supplied in this manner is about 70 Hz, which is similar to the frequency of the AC voltage induced by the AC power supply unit 100 by adjusting the frequency generated by the pulse width modulation control circuit CC.

The primary side coil unit 10 of the high voltage transformer HVT includes a first primary side coil 14 and the AC power source 100 for inputting an AC voltage applied from the DC power source 300 as in the first embodiment. And a second primary side coil 12 for inputting an alternating voltage applied from the second side, and the secondary side coil unit 20 of the high voltage transformer HVT induces a high pressure to drive the magnetron MGT. The secondary coil unit 22 and the filament coil unit 24 for supplying a filament voltage for driving the magnetron (MGT).

Accordingly, each AC voltage induced from the DC power supply unit 300 and the AC power supply unit 100 may have the first primary side coil unit 14 and the second primary side nose of the primary side coil unit 10 of the high voltage transformer HVT. A portion 12 is applied to each part, and the applied voltage is boosted by the first secondary side coil part 22 to induce a high voltage. The induced high voltage actuates the magnetron MTG by the operation of the first secondary side coil portion 22 and the filament coil portion 24.

The microwave is generated by the operation of the magnetron (MGT), and thus the microwave oven is operated. The high voltage is induced to the secondary coil unit 20 of the high voltage transformer HVT by the AC voltage applied to the primary coil unit 10.

The magnetron MTG is driven by the induced high voltage, and microwaves are generated according to the driving of the magnetron.

For reference, although not shown in the external housing of the microwave oven, an external AC input unit for inputting commercial AC power to the AC power supply unit 100 and a DC power supply DC to the DC power supply unit 300 are input. An external direct current input unit is installed.

Therefore, according to the above-described AC and DC combined microwave oven, each AC voltage induced from the AC power supply unit 100 and the DC power supply unit 300 is the first day of the primary coil unit 10 of the high voltage transformer HVT. Applied to the secondary coil 14 and the second primary side coil 12, respectively, the applied voltage is boosted by the first secondary side coil unit 22 to induce a high voltage, and the induced high voltage is the first secondary. It is configured to operate the magnetron MTG by the operation of the side coil part 22 and the filament coil part 24. That is, the microwave oven according to the present invention is designed to be driven by both the DC power source (DC) or AC power source (AC), the outdoor place or ship, air and other transportation that can not supply AC power (AC) The means uses a direct current power source (DC), such as a battery, to drive the microwave. On the other hand, it can supply AC power, but if there is no battery, it converts the commercial AC power source to high frequency AC power. It becomes possible.

Although one embodiment for carrying out a microwave oven for a vehicle has been illustrated and described above, the present invention is not limited to the above-described embodiment, and the present invention belongs without departing from the gist of the present invention as claimed in the claims. Anyone with ordinary knowledge in the field will be able to implement various changes.

Claims (4)

A voltage / frequency conversion unit for outputting a DC power input terminal for inputting DC power and a DC power from the DC power input terminal as an AC power source to generate a voltage pulse of a constant frequency in response to the input DC power voltage; A DC power supply unit having a DC / AC conversion unit configured of an inverter including a push-pull circuit for applying an AC voltage to the primary coil of the high voltage transformer by alternately turning on / off in response to a voltage pulse; An AC power supply unit having an AC power input terminal for inputting AC power; And A primary coil portion comprising a first primary coil portion for inputting an AC voltage applied from the DC power supply portion and a second primary coil portion for inputting an AC voltage applied from the AC power supply portion, and inducing high voltage to drive the magnetron; Transformer comprising a secondary side coil portion consisting of a first secondary coil portion and a filament coil portion for supplying a filament voltage for driving the magnetron; AC and DC combined microwave oven comprising a. delete delete delete

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