KR200146178Y1 - Operating apparatus of relay for microwave oven - Google Patents

Abstract

The present invention relates to a relay driving apparatus of a microwave oven, the main relay is turned on based on the driving pulse provided from the microcomputer, and a predetermined power is supplied to the lamp and the fan motor, and based on the driving pulse provided from the microcomputer. The inrush relay prevents the current from flowing back from the Neutrol line to the live line, and the power relay is turned on based on the driving pulse from the microcomputer to provide a predetermined power source to the HVT. Since the driving time interval of the pulse is 20mS and the operating time interval of each driving pulse provided from the microcomputer is short, the resistance of small load (for example, 2W to 5W) can be mounted in the part design, so that Not only can the volume be reduced, but the operating time can be improved.

Description

Relay Drive of Microwave Oven

The present invention relates to a relay driving apparatus for a microwave oven, and more particularly to a relay driving apparatus for a microwave oven suitable for generating a driving pulse for driving the main relay, inrush relay and power relay of the microwave oven.

In general, a microwave oven generates a high voltage (for example, about 22,000 V) from a high voltage transformer based on a predetermined power supply (for example, 220 V) provided from the outside, and ultra high frequency is generated from the magnetron based on the high voltage. The food seated in the cooking chamber of the microwave oven is configured to be heated and cooked.

On the other hand, in the microwave oven, various relays are provided on and off based on a driving pulse from the microcomputer to provide predetermined power to each component in the microwave oven. In particular, the main relay supplies predetermined power to a lamp and a fan motor in the microwave oven. The inrush relay prevents the current from flowing back from the new troll wire to the live line, and the power relay performs a function of providing a predetermined power supply to a high voltage transformer (hereinafter referred to as HVT). do.

FIG. 3 is a diagram showing each driving pulse for driving a conventional main relay, inrush relay, and power relay, and FIG. 3 (a) shows the driving pulse provided as the main relay. ) Denotes a drive pulse provided by an inrush relay, and (c) of FIG. 3 shows a drive pulse provided by a power relay.

Referring to FIG. 3, the driving pulse provided from the microcomputer to the main relay is switched from the low level state to the high level state so that predetermined power is supplied to the lamp and the fan motor through the main relay, and is provided as the main relay. After 100mS at the time when the driving pulse is switched to the high level state, the driving pulse provided from the microcomputer to the inrush relay is switched from the low level state to the high level state so that current is supplied from the live line to the new troll line.

In addition, after 100mS at the time when the driving pulse provided by the inrush relay is switched to the high level state, the driving pulse provided from the microcomputer to the power relay is switched from the low level state to the high level state to provide a predetermined power source to the HVT. After 100mS at the time when the driving pulse provided to the relay is switched to the high level state, the driving pulse provided to the inrush relay is switched from the high level state to the low level state to prevent the current from flowing back from the new troll line to the live line.

However, since the operating time intervals of the driving pulses provided from the microcomputer to the main relay, inrush relay and power relay are 100mS, respectively, a large load resistor (for example, about 10W) must be installed in the component design, thus relay driving. The problem is that the volume of the device is large and the operation time is slow.

Accordingly, the present invention has been made in view of the problems of the prior art as described above, and provides a relay driving apparatus of a microwave oven capable of providing a driving pulse having an operating time interval of 20 mS with a main relay, an inrush relay and a power relay. The purpose is to provide.

In order to achieve the above object, the present invention provides a power relay for supplying predetermined power to HVT and an inrush relay for preventing current from flowing back from the main relay and the new troll wire to the live line. In the microwave relay drive device for generating each drive pulse, the operation time interval of each drive pulse provides a relay drive device for a microwave oven, characterized in that 16.8mS to 20mS.

1 is a schematic block diagram of a relay driving apparatus of a microwave oven according to a preferred embodiment of the present invention.

2 is a diagram showing each driving pulse for driving the main relay, the inrush relay and the power relay according to the present invention.

3 is a diagram showing each driving pulse for driving a conventionally generated main relay, inrush relay and power relay.

* Explanation of symbols for main parts of the drawings

100: key operation unit 110: microcomputer

120: main relay 130: inrush relay

140: power relay

The above and other objects and various advantages of the present invention will become more apparent through the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a relay driving apparatus of a microwave oven according to the present invention. As can be seen from the drawing of FIG. 1, a key operation unit 100 generating a key signal for driving a microwave oven, and a key. The microcomputer 110 generating the driving pulses for driving the main relay 120, the inrush relay 130, and the power relay 140 based on the driving key signal from the operation unit 100, and the microcomputer 110. The main relay 120 provides predetermined power to the lamp and the fan motor based on the driving pulse provided from the circuit, and the phosphor prevents the current from flowing back from the Neutrol line to the live line based on the driving pulse from the microcomputer 110. The power relay 140 provides a predetermined power source to the HVT based on the rush relay 130 and the driving pulse from the microcomputer 110.

With reference to FIGS. 1 to 2 will be described in more detail with respect to the operation process of the relay drive device of the microwave oven according to the present invention made of the above-described constituent members.

First, when a user selects a desired function through the key operation unit 100 and then manipulates a cooking start key, a corresponding key signal is provided from the key operation unit 100 to the microcomputer 110, and the microcomputer 110 is provided. Each driving pulse for performing a function corresponding to the key signal from the key manipulation unit 100 is generated by the main relay 120, the inrush relay 130, and the power relay 140.

In detail, as shown in FIG. 2, the driving pulse provided from the microcomputer 110 to the main relay 120 is switched from the low level state to the high level state so that the lamp and the fan may be changed through the main relay 120. When a predetermined power is supplied to the motor ((a) of FIG. 2), and the driving pulse provided to the main relay 120 is switched to the high level state, the motor is provided from the microcomputer 110 to the inrush relay 130 after 20 mS. The driving pulse is changed from the low level state to the high level state, and current is supplied from the live line to the Neutral line.

In addition, the driving pulse provided from the microcomputer 110 to the power relay 140 is switched from the low level state to the high level state after 20 mS at the time when the driving pulse provided to the inrush relay 130 is switched to the high level state. When the predetermined power is supplied to the HVT and the driving pulse provided to the power relay 140 is switched to the high level state, the driving pulse provided to the inrush relay 130 is changed from the high level state to the low level state after 20 mS. This prevents current from flowing back from the Neutrol line to the live line.

As described above, the main relay 120 is turned on based on the driving pulse provided from the microcomputer 110 to supply predetermined power to the lamp and the fan motor, and based on the driving pulse provided from the microcomputer 110. The current is prevented from flowing back from the Neutrol line to the live line through the inrush relay 130, and the power relay 140 is turned on based on the driving pulse from the microcomputer 110, and the predetermined power is supplied to the HVT. In this case, the driving time interval of each driving pulse provided from the microcomputer 110 is 20 mS.

Meanwhile, in the exemplary embodiment of the present invention, the driving time intervals of the driving pulses provided to the main relay 120, the inrush relay 130, and the power relay 140 have been described with 20 mS, but the driving time intervals of the driving pulses are described. Substantially the same function is performed even with a predetermined range of 16.8 to 20mS.

Therefore, according to the present invention, since the operation time interval of each driving pulse provided from the microcomputer 110 is short, a relay with a small load (for example, 2W to 5W) can be mounted in the component design, so that the relay driving device In addition to reducing the volume of the, there is an effect that can improve the operating time.

Claims (1)

Relay of microwave oven which generates each driving pulse with main relay that provides predetermined power to lamp and fan motor and inrush relay that prevents current from flowing back from live wire to new line and power relay which supplies predetermined power to HVT. The driving apparatus of claim 1, wherein the operation time interval of each driving pulse is 16.8mS to 20mS.