KR100294179B1 - High voltage transformer of AC / DC combined microwave - Google Patents

Abstract

The high voltage transformer of the AC / DC combined microwave oven disclosed relates to a high voltage transformer of an AC / DC combined microwave oven capable of using an AC power source or a DC power source. The present invention provides a core in which a plurality of iron pieces are stacked / fixed, a first input coil wound around the core to input AC power, a second input coil wound on the core to input AC power converted from DC power, and And an output coil wound around the core to output a voltage derived from the first or second input coil. Here, the second input coil is a plate-shaped coil whose cross section is formed in a substantially rectangular shape, it is preferable to operate in the frequency range of approximately 50 to 1000Hz. Further, it is further preferable to further include another output coil wound on the core to output a voltage derived from the first or second input coil. Therefore, there is no fear of burnout or short-circuit even in the high frequency range of about 50 to 1000 Hz generated when the DC power source is converted to AC power, and thus it can be effectively used in an AC / DC microwave oven.

Description

High voltage transformer of AC / DC combined microwave oven

The present invention relates to a high-voltage transformer, and more particularly to a high-voltage transformer of the AC / DC combined microwave oven that can be used as an AC power supply or a DC power supply.

In general, a high voltage transformer is a device that receives AC power from one circuit and supplies power to another circuit by electromagnetic induction, and normally inputs a commercial voltage and boosts the voltage to a high voltage to output it.

Figure 1 is a perspective view showing such a conventional general high voltage transformer. According to this, the conventional high-voltage transformer is provided with the core 2 by which several normal iron pieces 1 of the E and I structures are laminated / fixed, respectively. In addition, the core 2 has a central axis 2a protruding to the center thereof so as to form grooves 2b symmetrically to the left and right. In addition, the input coil 4 and the output coil 5 are wound a plurality of times on the central axis 2a, respectively.

In addition, an input terminal 4a is connected to one end of the input coil 4, and an output terminal 5a is electrically connected to one end of the output coil 5, respectively. Therefore, after inputting the commercial alternating voltage (AC 110 or 220V) through the input terminal (4a), it is configured to convert to a predetermined high voltage, and output this high voltage through the output terminal (5a).

Recently, high voltage and high voltage transformers that output high voltages have been applied to home appliances such as microwave ovens for cooking food using microwaves.

The microwave oven is a device for heating / cooking food using microwave, and is composed of a high voltage transformer and a magnetron that output a normal high voltage. 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 an enclosed 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) to obtain a high output AC voltage.

FIG. 2 is a circuit diagram illustrating the microwave oven to which the conventional high voltage transformer of FIG. 1 is applied.

Accordingly, the on / off switch SW1, the lamp L1 and the fan motor FM driven by the AC power source AC are provided on the primary coil 11 side of the high voltage transformer 10. Here, the switch SW1 is operated by a user to determine the driving state of the microwave oven. For example, when the switch SW1 is turned on, an AC power source AC is applied to the primary coil 11 of the lamp L1, the fan motor FM1, and the high voltage transformer 10. It is driven. In addition, the secondary coils 12 and 13 of the high voltage transformer 10 have a magnetron (MGT) for generating microwaves, and a high voltage capacitor (HVC) and a high voltage diode (HVD) for supplying a double voltage to the magnetron (MGT). ) Is provided.

In the conventional microwave oven configured as described above, in particular, the high voltage transformer 10 outputs a high voltage (usually 2100 to 2400 V) to drive the magnetron (MGT), and for this purpose, the primary coil 11 and the secondary It is preferable to be configured to generate a desired high voltage by adjusting the turns ratio of the coils 12 and 13. Therefore, the magnetron (MGT) is driven by the high voltage output from the high-voltage transformer 10, the food is heated / cooked by the microwaves emitted from the magnetron (MGT).

However, the conventional high voltage transformer configured as described above is usually designed to be driven only by commercial AC power (AC 110V or 220V) of 50 to 60 Hz, thus converting a higher frequency range (eg, DC power to AC power). In the frequency range of about 50 to 1000 Hz, which occurs when the coil is damaged, coils may be burned out or short circuits may occur between the coils.

Therefore, the present invention has been made to solve the problems of the prior art as described above, the purpose of which is to use an AC power source or a DC power source, but also to operate in a high frequency range of the AC power source converted from DC power source It is to provide high voltage transformer of AC / DC combined microwave oven.

1 is a perspective view showing a conventional general high voltage transformer,

2 is a circuit diagram showing a microwave oven to which the high voltage transformer of FIG.

3 is a perspective view showing a preferred embodiment of the high-voltage transformer of the AC / DC combined microwave oven according to the present invention,

4 and 5 are circuit diagrams showing an operating state of the AC / DC combined microwave oven according to the present invention.

<Description of the symbols for the main parts of the drawings>

200: high voltage transformer 210: core

211: iron strip 201: first input coil

204: second input coil 202, 203: output coil

A high voltage transformer of an AC / DC combined microwave oven according to the present invention for achieving the above object includes a core in which a plurality of iron pieces are stacked / fixed, a first input coil wound around the core to input AC power, And a second input coil wound around the core to input an AC power converted from a DC power source, and an output coil wound around the core to output a voltage derived from the first or second input coil. Here, the second input coil is a plate-shaped coil whose cross section is formed in a substantially rectangular shape, and it is preferable to operate in a frequency range of approximately 50 to 1000 Hz.

Further, it is further preferable to further include another output coil wound on the core to output a voltage derived from the first or second input coil.

Therefore, there is no fear of burnout or short-circuit even in the high frequency range of about 50 to 1000 Hz generated when converting the DC power to the AC power, it can be effectively applied to a microwave oven using a combination of AC power or DC power.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the high-voltage transformer of the AC / DC combined microwave oven according to the present invention.

Figure 3 is a perspective view showing a preferred embodiment of the high-voltage transformer of the AC / DC combined microwave oven according to the present invention.

According to this, the core 210 in which several normal iron pieces 211 of the E and I structures are laminated / fixed is provided. In addition, the core 210 has a central axis 212 protruding toward its center to form a groove 213 symmetrically to the left and right. The first input coil 201, the second input coil 204, and the output coil 202 are wound a plurality of times on the central axis 212, respectively.

The first input coil 201 is wound around the core 210 to input commercial AC power, and the second input coil 204 is wound around the core 210 to be converted from DC power DC. The AC power is input, and the output coil 202 is wound around the core 210 to output voltages respectively derived from the first or second input coils 201 and 204.

Here, the second input coil 204 is a plate-shaped coil whose cross section is formed in a substantially quadrangular shape, and is operated in a frequency range of about 50 to 1000 Hz. In addition, it is further provided with another output coil 203 (see Fig. 4 or 5) is wound on the core 210 and outputs a voltage derived from the first or second input coil 201 (204), The other output coil 203 is connected to the high voltage diode HVD and the high voltage capacitor HVC to be described later to form a double voltage circuit.

4 and 5 are circuit diagrams showing an operating state of the AC / DC combined microwave oven according to the present invention.

According to the present invention, the AC / DC combined microwave oven according to the present invention is a commercial AC power source (AC) and a DC power source (DC), the rotary AC conversion unit 100, the switch SW1 (SW2), and the resonance. A capacitor C, a high voltage transformer 200, and a magnetron (MGT).

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. An AC lamp L1 and a fan motor FM1 driven by the switch SW1 on / off are provided on the AC power source AC side. On the other hand, the DC power supply (DC) side is provided with a direct current lamp (L2) and a fan motor (FM2) driven in accordance with the on / off of the switch (SW2).

The rotatable alternating current conversion means 100 converts the direct current power source DC into the alternating current power source AC by the rotation of the commutator 130. Looking at the configuration, the rotating alternator 130 is rotated. Reverse voltage prevention diodes D1 to D4 connected between the motor 110 and the brushes 121 to 124 and the respective brushes 121 to 124 which are in contact with the outer circumferential surface of the commutator 130. It includes.

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.

In addition, the switch SW2 is connected in parallel with the resonant capacitor C to turn on / off the motor 110 of the rotary AC conversion means 100 together with the lamp L2 and the fan motor FM2. Let's do it.

The high voltage transformer 200 is selectively supplied with the AC power converted from the commercial AC power or the rotational AC conversion means 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 are high voltage diodes and high voltage capacitors for double voltage, respectively, and are connected to the illustrated output coil 203.

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

The high-voltage transformer of the AC / DC combined microwave oven according to the present invention can be used for both a commercial AC power source or a DC power source. Here, the commercial AC power is input through the first input coil 201 of the high voltage transformer 200 and boosted according to the turns ratio, and then outputs a high voltage through the output coils 202 and 203. As described above, since the operation of the microwave oven driven by a commercial AC power supply is similar to that described in the prior art, a detailed description thereof will be omitted, and the operation state of a DC power source such as a battery will be described here. Let's look at it.

First, when the switch SW2 is turned on by the user, as shown in FIG. 2, a DC power supply DC of 12V to 24V is supplied to the motor 110 of the rotational AC converting means 100 so that the motor ( 110 is driven, and loads of the lamp L2 and the fan motor FM2 are also operated. 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.

That is, the motor 110 rotates the commutator 130 fixed to the rotation axis (not shown) as shown in Figure 4, and thus each brush in contact with the four sides of the outer peripheral surface of the commutator 130 The electric current is alternately conducted between the brushes 121 and 122 and 123 and 124 or 121 and 124 and 122 and 123 which are adjacent to each other among the 121 to 124.

That is, the current supplied from the (+) terminal of the DC power source DC is input to the communicator 130 through the upper brush 121 shown in FIG. 4, and the brush on the left side of the brush (131) through the conductive portion 131. 122) direction (see arrow direction). Therefore, a current flows from the downward direction upward to the second input coil 204 of the high voltage transformer 200, and the current sequentially passes through the right brush 124, the conductive part 132, and the lower brush 123. As it flows in the direction of the arrow, it is circulated to the negative terminal of the DC power supply DC.

In addition, when the communicator 130 is rotated at a predetermined angle (for example, 90 °), the arrow direction passes through the upper brush 121, the conductive part 131, and the right brush 124 as shown in FIG. 5. Current flows. Accordingly, a current flows from the upper side to the lower side in the second input coil 204 of the high voltage transformer 200, after which the current passes through the left brush 122, the conductive portion 132, and the lower brush 123 (arrow). Direction) As described above, the negative terminal of the DC power supply DC is circulated.

As the commutator 130 rotates while alternately contacting the brushes 121 to 124, the current flowing through the second input coil 204 of the high voltage transformer 200 is alternated in the vertical direction. The predetermined voltage is induced to the output coil 202 and the other output coil 203. Thus, the high voltage transformer 200 can generate a desired high voltage on its output side.

On the other hand, AC power converted from DC power is input to the second input coil 204 of the high voltage transformer 200, where the AC power generates a frequency of about 50 to 1000 Hz, which is higher than a general AC power supply. Since the second input coil 204 according to the present invention, that is, the cross section is input through a substantially rectangular plate-shaped coil, the burnout or the short circuit due to the high frequency is prevented. 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).

In addition, the present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as 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 high voltage transformer of the AC / DC combined microwave oven according to the present invention, it can be used in a commercial AC power supply, as well as a high frequency range of about 50 to 1000 Hz generated when converting a DC power source into an AC power source. There is no risk of burnout or short circuit, so there is an effect that can be applied very effectively to a microwave oven using a combination of AC power or DC power.

Claims (3)

A core in which a plurality of iron pieces are stacked / fixed; A first input coil wound around the core to input AC power; A second input coil wound into the coil to input an AC power source converted from a DC power source and having a plate-shaped coil whose cross section is substantially rectangular; And an output coil wound around the core and outputting a voltage derived from the first or second input coil. 2. The high-voltage transformer of the microwave oven of claim 1, wherein the second input coil is operated in a frequency range of about 50 to 1000 Hz. The high voltage transformer of claim 1, further comprising another output coil wound around the core to output a voltage derived from the first or second input coil.