KR20000008827A - Ac/dc microwave oven having function for displaying battery residual quantity - Google Patents

Abstract

PURPOSE: AC/DC microwave oven has a function which displays a battery residual quantity. CONSTITUTION: AC/DC microwave oven includes a converter(100), a high voltage transformer(200), and a magnetron(MGT). The microwave oven includes a voltage detector(330) for detecting an output voltage of the battery. A microcomputer senses a battery residual quantity by sensing an output voltage of the voltage detector, and outputs a corresponding control signal. Alarm/display part(320) displays a battery residual quantity or alarms it according to the control signal of the microcomputer. Thereby, the user can recognize a battery state, the microwave oven alarms a dangerous battery state to the outside, and stops its operation.

Description

AC / DC combined microwave with battery level indicator

The present invention relates to a microwave oven for both AC and DC, and more particularly, to display or alert a user so as to recognize the remaining capacity of a battery supplying DC power, and to display the remaining battery capacity to improve convenience of use thereof. It relates to an AC / DC combined microwave oven having a function.

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, looking at the state of operating with a DC power source DC, when the power switch (SW2) is turned on by the user, as shown in Figure 2, the DC power source (DC) of 12V to 24V normally from the battery 140 It is supplied to the motor 110 of the typical AC conversion means 100 to drive the motor 110. 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 suddenly stops the operation of the microwave when the battery is exhausted when a DC power source is used through a conventional battery, or when the user uses a car battery. There was a problem that the battery is discharged while not doing.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, by displaying or alerting the user to recognize the remaining amount of the battery supplying DC power, thereby improving its convenience of use. It provides an AC / DC microwave oven with battery level indicator.

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 a battery level display 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 300: key input unit

310: microcomputer 320: alarm / display unit

330: voltage detector RY1, RY2: power relay

MGT: Magnetron

In order to achieve the above object of the present invention, there is provided an AC / DC combined microwave oven having a battery remaining charge display function. The rotating AC converter converts DC power of a battery into AC power by rotating a commutator, and AC / DC combined with a high voltage transformer that receives the AC power converted from the rotary AC conversion means or a 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. In the microwave oven, a voltage detector for detecting the output voltage of the battery, a voltage detected by the voltage detector to determine the remaining amount of the battery, and outputs a control signal corresponding to the microcomputer and the microcomputer control signal. And an alarm / display unit for displaying or alarming the remaining amount of the battery.

In addition, when the remaining amount of the battery falls below a predetermined reference amount, it is preferable to further include a power relay on the DC power supply side is turned off by the microcomputer to prevent the microwave oven from operating.

Therefore, by displaying the remaining amount of the battery supplying the DC power to recognize the current state of use of the battery, and when the remaining amount of the battery falls below a predetermined reference amount, the alarm and the drive of the microwave It is possible to stop the discharge of the battery in advance by stopping, thereby improving the convenience of use.

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

Figure 3 is a circuit diagram showing a preferred embodiment of the AC / DC combined microwave oven having a battery level display function according to the present invention.

Accordingly, the battery 140 is rotated by the rotation of the AC power supplied from the AC and the battery 140, the lamp L1, the fan motor FM1, and the commutator 130. A high voltage outputting a high voltage by being supplied with a rotational AC conversion means 100 for converting a DC power supply to an AC power and an AC power converted from the rotational AC conversion means 100 or a common commercial AC power source. 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 voltage detector 330 for detecting the output voltage of the battery 140 and the voltage detected by the voltage detector 330 to detect the remaining amount of the battery 140 The microcomputer 310 outputs a control signal corresponding thereto, the alarm / display unit 320 displaying or alerting the remaining amount of the battery 140 by the control signal of the microcomputer 310, and the battery 140. When the remaining amount falls below the preset reference amount, the microcomputer 310 further includes a power relay RY2 on the DC power source DC side that is turned off by the microcomputer 310 to prevent the microwave oven from operating.

In addition, a separate power relay RY1 is also provided on the AC power source AC side, and each of the power relays RY1 and RY2 is turned on / off in accordance with a control signal of the microcomputer 310 to supply the DC power. The input power is supplied to or cut off from the load on the (DC) side or the AC side.

In addition, a key input unit 300 for outputting the manipulation signal according to a user's key input to the microcomputer 310 through a plurality of manipulation switches (not shown) is provided.

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

The user is selectively driven by supplying commercial AC power or DC power to the microwave oven through the key input unit 300. For example, among the plurality of operation switches SW30 and SW31, SW30 is a commercial AC power source and SW31 is a DC power source, respectively. Looking at the operation state (AC) is as follows.

When a user turns on an operation switch (not shown) of the key input unit 300, this signal is output to the microcomputer 310. The microcomputer 310 outputs a control signal corresponding to the operation signal of the key input unit 300 to turn on the power relay RY1 on the AC side, whereby the input power is supplied to the load.

Accordingly, the lamp L1 and the fan motor FM1 are driven and the AC power source 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 by the DC power source DC, when the user turns on the other operation switch (not shown) of the key input unit 300, this signal is output to the microcomputer (310). The microcomputer 310 outputs a control signal corresponding to the operation signal of the key input unit 300 to turn on the power relay RY2 on the DC power source DC side, whereby input power is supplied to the load.

Therefore, a DC power source (DC) of 12V to 24V is usually supplied from the battery 140 to the motor 110 of the rotary AC conversion means 100 to drive the motor 110. 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).

In this state of operation, the voltage detector 330 detects the output voltage of the battery 140 and inputs it to the microcomputer 310. Accordingly, the microcomputer 310 determines the remaining amount of the battery 140 based on the voltage detected by the voltage detector 330, and outputs a control signal corresponding to the alarm / display unit 320 to the alarm / display unit. 320 displays the remaining amount of the current battery 140.

On the other hand, when the remaining amount of the battery 140 falls below a preset reference amount, the microcomputer 310 recognizes the current battery 140 shortage state to the user through the alarm / display unit 320, and the DC power ( The power relay RY2 on the DC side is turned off so that the microwave oven is not operated, thereby preventing the battery 140 from being discharged.

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 the battery remaining amount display function displays the remaining amount of the battery supplying the DC power so that the present state of use of the battery can be recognized. When the remaining amount of the battery falls below a predetermined reference amount, the alarm and at the same time stop the driving of the microwave to prevent the discharge of the battery in advance, there is an effect that improves the convenience of use.

Claims (2)

Rotational AC conversion means for converting the DC power of the battery into AC power by the rotation of the commutator, and a high-voltage transformer supplied with the AC power converted from the rotational AC conversion means or normal commercial AC power and outputting a high voltage; In the microwave oven for AC / DC having a magnetron that is driven by a high voltage output from the high voltage transformer to emit microwaves, A voltage detector detecting an output voltage of the battery; A microcomputer sensing the voltage detected by the voltage detector to determine the remaining amount of the battery and output a control signal corresponding thereto; And And an alarm / display unit for displaying or alarming the remaining battery level according to the control signal of the microcomputer. The method of claim 1, further comprising: a power relay on the DC power supply side, which is turned off by the microcomputer to prevent the microwave from operating when the remaining capacity of the battery falls below a preset reference amount. AC / DC combined microwave oven.