KR100291023B1 - AC / DC combined microwave oven with input power switching function - Google Patents

Abstract

An AC / DC combined microwave oven having an input power switching function is disclosed. The present invention provides a high voltage outputting a high voltage by receiving a rotational AC conversion means for converting a DC power source into an AC power source by rotation of a commutator, and an AC power source converted from the rotary AC conversion means or a normal commercial AC power source. In an AC / DC combined microwave oven having a transformer and a magnetron driven by a high voltage output from the high voltage transformer to emit microwaves, each input power is selectively supplied to a load on the DC power supply side or the commercial AC power supply side. A switching switch which is switched / operated by the user as much as possible. Here, it is preferable that the said switching switch acts so that the other power supply side may be an open loop, when the one of the DC power supply side or the commercial AC power supply side has a closed loop formed. Therefore, AC power or DC power can be used as both, but only one power is input through the switch, thereby preventing the input of each AC or DC power at the same time, and accordingly, overcurrent flows in the high voltage transformer. In addition to this, it is possible to prevent malfunction of the device.

Description

AC / DC combined microwave oven with input power switching function

The present invention relates to an AC / DC combined microwave oven, and more particularly, to have an AC power source or a DC power source, but having an input power switching function to prevent each AC or DC power source from being input at the same time. It relates to an AC / DC microwave oven.

In general, a microwave oven is a device that heats / cooks food using microwaves, and includes a conventional high voltage transformer and a magnetron. Therefore, when AC power is applied to the high voltage transformer, the high voltage transformer generates a predetermined high voltage to drive the magnetron, which emits microwaves of high frequency (approximately 2450 MHz) in a sealed space in which food is stored. The microwave thus emitted vibrates the water molecules contained in the food, and molecular friction heat is generated by the vibration of the water molecules, thereby heating / cooking the food.

On the other hand, such a microwave oven is configured to operate with a conventional commercial AC power supply (AC 110V or 220V) in order to obtain a high output AC voltage, but in recent years, various microwave ovens using both DC and AC are being developed. .

1 is a circuit diagram illustrating such a conventional AC / DC combined microwave oven, and FIG. 2 is a circuit diagram illustrating a state in which the current direction is alternately rotated by the commutator of FIG. 1.

According to this, the commercial AC power source and the DC power source, the rotary AC conversion means 100, the respective power switches SW1 and SW2, the resonance capacitor C, and the high voltage transformer 200) and magnetrons (MGTs). As the commercial AC power source, a normal household AC power source (110V or 220V) is applied, and as the DC power source DC, a normal vehicle battery (12V or 24V) is preferably applied.

A lamp L1 and a fan motor FM1 driven according to the on / off of the power switch SW1 are provided on the commercial AC power side. In addition, a rotatable alternating current conversion means 100 is provided on the DC power supply DC side, and the rotatable alternating current conversion means 100 converts the direct current power supply DC by the rotation of a commutator 130. When converting to AC, the configuration thereof will be described in detail. Each of the brushes 121 to 124 that are in contact with the motor 110 for rotating the commutator 130, and the outer circumferential surface of the commutator 130, and The reverse voltage prevention diodes D1 to D4 connected between the respective brushes 121 to 124 are included.

The commutator 130 is divided into two poles on its outer circumferential surface as shown in order to alternately conduct current to the brushes 121 and 122, 123 and 124 or 121 and 124, 122 and 123 which are adjacent to each other when rotating. Each conductive portion 131, 132 is formed. Accordingly, the rotatable alternating current conversion means 100 may obtain an AC power source having various output frequencies according to the rotational speed of the commutator 130 or the shape and structure of the conductive parts 131 and 132.

In addition, the power switch SW2 is connected in parallel with the resonant capacitor C to turn on / off the motor 110 of the rotary AC converting means 100.

The high voltage transformer 200 receives the AC power converted from the commercial AC power or the AC converter 100 to output a high voltage. In addition, the magnetron (MGT) is driven by a high voltage output from the high voltage transformer 200 to emit microwaves. Here, reference numerals HVD and HVC denote high voltage diodes and high voltage capacitors for double voltage, respectively.

The operation of the conventional AC / DC combined microwave oven configured as described above is as follows.

First, referring to a state in which the AC power is operated, when the power switch SW is turned on by the user, the lamp L1 and the fan motor FM1 are driven, and the primary of the high voltage transformer 200. The AC power source AC is applied to the coil 201. Accordingly, the high voltage transformer 200 induces a voltage on the secondary coils 202 and 203 so as to output a predetermined high voltage, thereby driving the magnetron MTG and discharging it from the magnetron MGT. The microwave is heated / cooked.

On the other hand, when looking at the state of operating in the DC power source DC, when the power switch (SW2) is turned on by the user, as shown in Figure 2 DC power source (DC) of 12V to 24V is typically a rotary AC conversion means ( It is supplied to the motor 110 of 100 and this motor 110 is driven. Here, the motor 110 rotates the commutator 130 of the rotatable alternating current conversion means 100 to convert the direct current power source DC into the alternating current power source AC.

In more detail, the motor 110 rotates the commutator 130 fixed to the rotating shaft (not shown) as shown in FIG. 1, thereby contacting all sides of the outer circumferential surface of the commutator 130. Each of the brushes 121 to 124 that are adjacent to each other to alternately conduct current between the brush (121 and 122, 123 and 124 or 121 and 124, 122 and 123).

That is, the current supplied from the (+) terminal of the DC power source DC is input to the commutator 130 through the upper brush 121 shown, and through the conductive portion 131 toward the brush 122 on the left side thereof. Will flow (see arrow direction). Accordingly, a current flows from the downward direction upward to the primary coil 204 of the high voltage transformer 200, and the current passes sequentially through the illustrated right brush 124, the conductive part 132, and the lower brush 123. By flowing in the direction of the arrow, it is circulated to the negative terminal of the DC power supply.

In addition, when the communicator 130 is rotated at a predetermined angle (for example, 90 °), as shown in FIG. 2, the arrow direction passes through the upper brush 121, the conductive part 131, and the right brush 124. Current flows. Accordingly, a current flows from the upper coil downward to the primary coil 204 of the high voltage transformer 200, and then the current passes through the left brush 122, the conductive portion 132, and the lower brush 123 (the arrow direction). As described above, it is circulated to the negative terminal of the DC power supply DC.

As the commutator 130 rotates while alternately contacting the brushes 121 to 124, the current flowing through the primary coil 204 of the high voltage transformer 200 alternates up and down, and the secondary The predetermined voltage is induced to the coils 202 and 203. Thus, the high voltage transformer 200 can generate a desired high voltage on its output side.

Therefore, the magnetron (MGT) is driven by the high voltage output from the high-voltage transformer 200, the food is heated / cooked by the microwaves emitted from the magnetron (MGT).

However, the conventional AC / DC combined microwave oven configured as described above may use both a commercial AC power source or a DC power source such as a battery as described above. However, the commercial AC power source and the DC power source may be used. When (DC) is input at the same time, these power supplies are all input to the high voltage transformer, the overcurrent flows in the high voltage transformer, and also causes a malfunction of the device.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, to be used as an AC power source or a DC power source, but to prevent the input of each AC or DC power input at the same time The present invention provides an AC / DC combined microwave oven having a power switching function.

1 is a circuit diagram showing a conventional AC / DC combined microwave oven,

2 is a circuit diagram illustrating a state in which the current direction is alternately rotated by the commutator of FIG.

Figure 3 is a circuit diagram showing a preferred embodiment of the AC / DC combined microwave oven having an input power switching function according to the present invention.

Explanation of symbols on the main parts of the drawings

100: rotational AC conversion means 130: commutator

200: high voltage transformer MGT: magnetron

SW1, SW2: Power switch SW3: Switch

In order to achieve the above object, the AC / DC combined microwave oven having an input power switching function according to the present invention is characterized in that the rotational AC conversion means for converting a DC power source into an AC power source by the rotation of a commutator, and the rotary type device. AC / DC combined microwave with a high voltage transformer that receives the AC power converted from the AC conversion means or normal commercial AC power and outputs a high voltage, and a magnetron that is driven by the high voltage output from the high voltage transformer to emit microwaves The switch includes a switching switch which is switched / operated by the user to selectively supply each input power to the load on the DC power supply side or the commercial AC power supply side.

Here, it is preferable that the said switching switch acts so that the other power supply side may be an open loop, when the one of the DC power supply side or the commercial AC power supply side has a closed loop formed.

Therefore, AC power or DC power can be used as a dual purpose, and each AC or DC power is prevented from being input at the same time through a switching switch, thereby preventing overcurrent from flowing in the high voltage transformer and preventing malfunction of the device. You can prevent it.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the AC / DC combined microwave oven having an input power switching function according to the present invention, the same components as in the prior art will be described with the same reference numerals.

3 is a circuit diagram showing a preferred embodiment of an AC / DC combined microwave oven having an input power switching function according to the present invention.

According to this, rotation of the commercial AC power source and the DC power source, the respective power switches SW1 and SW2, the lamp L1, the fan motor FM1, and the commutator 130 are performed. High voltage outputting a high voltage by receiving a rotary AC conversion means 100 for converting a DC power to an AC power and an AC power converted from the rotary AC conversion means 100 or ordinary commercial AC power. The transformer 200 and a magnetron (MGT) driven by a high voltage output from the high voltage transformer 200 to emit microwaves are the same as those of the related art.

However, the main feature of the present invention, the switching switch (SW3) which is switched / operated by the user so that each input power is selectively supplied to the load on the DC power (DC) side or the commercial AC power (AC) side It includes more. Here, the switching switch SW3 is one of the DC power supply DC side and the commercial AC power supply side, when one of the power supply sides has a closed loop, the other power supply side is an open loop ( It is desirable to act as an open loop).

If described in more detail the action of the preferred embodiment according to the present invention configured as follows.

First, referring to a state in which the AC power is operated, the user switches the switching switch SW3 to form a closed loop at the AC power side. At this time, an open loop is formed at the DC power supply DC side to prevent current from flowing.

In this state, when the power switch SW1 is turned on by the user, the lamp L1 and the fan motor FM1 are driven, and the AC power AC is applied to the primary coil 201 of the high voltage transformer 200. . Accordingly, the high voltage transformer 200 outputs a high voltage through the secondary coils 202 and 203, and the magnetron MTG is driven by the high voltage, and is emitted by the microwave emitted from the magnetron MGT. Food is heated / cooked.

On the other hand, looking at the state of operating in the DC power source (DC), the user switches the switching switch (SW3), so that the DC loop (DC) side of the closed loop is formed. At this time, an open loop is formed at the commercial AC power source to prevent current from flowing. In this state, when the power switch SW2 is turned on by the user, a DC power supply DC of 12V to 24V is generally supplied to the motor 110 of the rotary AC converting means 100, as shown in the drawing, and thus the motor 110 is turned on. ) Is driven.

Here, the motor 110 rotates the commutator 130 of the rotatable alternating current conversion means 100, converts the direct current power source (DC) into an alternating current power source (AC), and supplies the high voltage transformer 200 to the high voltage transformer 200. The transformer 200 generates a desired high voltage on its output side, and this DC / AC conversion action is the same as described in detail through the prior art, so a detailed description thereof will be omitted.

Therefore, the magnetron (MGT) is driven by the high voltage output from the high-voltage transformer 200, the food is heated / cooked by the microwaves emitted from the magnetron (MGT). Therefore, even when the AC power and the DC power such as a battery is input at the same time, only one of the power is selectively input according to the setting state of the switch SW3 according to the present invention, the high voltage transformer (HVT) ) Prevents over current from flowing and prevents malfunction.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to fall within the scope of the claims set forth.

As described above, according to the present invention, the AC / DC combined microwave oven having an input power switching function may be used as an AC power source or a DC power source, but only one of the power sources selected through the switch is input. Each AC or DC power supply is prevented from being input at the same time, thereby preventing overcurrent from flowing in the high voltage transformer and preventing malfunction of the device.

Claims (2)

Rotational AC conversion means for converting DC power into AC power by rotation of a commutator, high voltage transformer for outputting high voltage by receiving AC power converted from the AC conversion means or normal commercial AC power; In the microwave oven for AC / DC with a magnetron that is driven by a high voltage output from a high-voltage transformer to emit microwaves, And a switching switch which is switched / operated by a user so that each input power is selectively supplied to the load on the DC power side or the commercial AC power side. The input power switching function according to claim 1, wherein the switching switch acts so that the other power supply side becomes an open loop when one of the power supply side is formed on the DC power supply side or the commercial AC power supply side. Microwave oven with AC / DC.