KR20060029891A - Method and apparatus for controlling of (a) micro wave range - Google Patents

Abstract

The present invention relates to a control apparatus and method of a microwave oven to minimize inrush current when there are a plurality of output terminals of a high voltage transformer (hereinafter referred to as HVT), in a microwave oven having a power supply unit. An HVT for generating a high voltage by the power supplied through the power supply, and an output adjuster for selectively supplying the power supplied from the power supply to the HVT so as to have different output levels in the HVT according to a user's request; And a control unit for outputting a control signal to the output adjustment unit so that time control is performed when power is supplied from the output adjustment unit to the HVT according to a driving condition. Select the drive of the first relay and the second relay with a certain margin So as driven to eliminate the residual magnetic flux remaining in the HVT,, nor be able to minimize the inrush current generated by the residual magnetic flux, there is an effect that it is possible to drive the HVT more stable it is possible to minimize the inrush current.

Microwave / HVT

Description

Method and apparatus for controlling microwave ovens {Method and apparatus for controlling of (a) micro wave range}

1 is a circuit diagram showing a control device of a typical microwave oven.

2 is a circuit diagram showing a control device of the microwave oven according to the present invention.

3 is a flow chart showing a control method of the microwave oven according to the present invention.

Explanation of symbols for main parts of the drawings

100: power input unit 200: output adjustment unit

201: first relay 202: second relay

300: HVT 400: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly, to an apparatus and method for controlling a microwave oven to minimize inrush current when there are a plurality of output terminals of a high voltage transformer (hereinafter, referred to as HVT).

In general, a microwave oven is a device that performs cooking by heating a cooking object inside a cavity using a microwave (Micro Wave) generated from a built-in magnetron as a main heating source.

This microwave oven obtains secondary high voltage by directly applying commercial AC power to the primary side of iron core type HVT, heating the cathode filament provided in the magnetron, and applying the high voltage of about 4,000 volts. Microwave energy is emitted.

The microwave energy is converted into thermal energy when it meets an object (ie, food ingredients, etc.) containing moisture or moisture in a closed space, and cooking can be performed by the characteristics of the microwave oven.

Hereinafter, with reference to the accompanying drawings will be described a general microwave control device as follows.

1 is a circuit diagram showing a control apparatus of a general microwave oven.

As shown in FIG. 1, a general microwave control apparatus includes a power supply unit 51, an HVT 53 for generating a high voltage by the power supplied through the power supply unit 51, and the HVT 53. MGT (55) for heating the food contained in the cooking chamber of the microwave by generating an electromagnetic wave by the high voltage generated in the, and a relay (57) for controlling the supply of voltage and frequency on and off, and the When the power is supplied from the power supply unit 51 is composed of a control unit 59 for controlling the HVT (53), MGT (55) and the relay (57).

Referring to the operation of the general microwave oven configured as described above, when power is supplied from the power supply unit 51 and the relay 57 is energized by the control of the control unit 59, the primary side of the HVT 53 is provided. An electric current flows, thereby inducing a voltage on the secondary side of the HVT 53.

In this case, a voltage of several volts for heating the filament of the MGT 53 and a current flows in the primary side of the MGT 55 in the secondary winding of the HVT 53, whereby two of the HVT 55 Voltage is induced on the secondary side.

Therefore, the secondary winding of the HVT 53 is provided with a voltage of several volts for heating the filament of the MGT 55 and thousands of volts for the oscillation of the MGT 55.

On the other hand, since the rectifying and smoothing means for performing rectification and smoothing action is provided at the cathode of the MGT 55, the AC voltage of the HVT 53 is doubled using the commercial AC power supply. The rectified DC 4KV power supply is applied to the MGT 55 that generates microwaves, and the food is cooked using the electromagnetic energy generated by the MGT 55.

However, such a general microwave oven cannot satisfy this when the output switching is required during cooking, and there is a problem in that cooking is not performed according to a condition desired by the user.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a control device of a microwave oven that can be switched output during cooking in accordance with user requirements.

In addition, the purpose is to minimize the inrush current generated when switching the output during cooking.

In order to achieve the above object, a control apparatus of a microwave oven according to the present invention includes a HVT for generating a high voltage by power supplied through the power supply unit in a microwave oven having a power supply unit, and in the HVT according to a user's request. And a control unit for selectively supplying power supplied from the power supply unit to the HVT to have different output levels, and a control unit for outputting a control signal to the output adjustment unit according to a user's request. have.

Preferably, the output adjusting unit outputs the first relay for supplying power to the HVT according to the control signal of the controller and the first and second levels having different output levels through the HVT according to the control signal of the controller. It is composed of a second relay to have the characteristics.

In accordance with another aspect of the present invention, there is provided a method for controlling a microwave oven, the method including: controlling a microwave oven having an HVT, a first relay, and a second relay; When the operation command is input, performing an operation according to the selected course, determining whether it is an output switching condition, and selectively controlling driving of the first and second relays according to whether the output switching condition is present. It is characterized by including the steps.

Preferably, the step of determining whether or not the output switching condition is characterized in that it is a step of determining the case where the preset set time or other load is operated.

More preferably, selectively controlling the driving of the first and second relays may be configured to selectively drive the first relay and the second relay according to the output switching condition, and to move the contact when the second relay is driven. It is the step of controlling, which is characterized.

Hereinafter, with reference to the accompanying drawings illustrating a control apparatus and method of a microwave oven according to the present invention.

2 is a circuit diagram showing a control device of the microwave oven according to the present invention, Figure 3 is a flow chart showing a control method of the microwave oven according to the present invention.

As shown in FIG. 2, the control apparatus of the microwave oven according to the present invention includes a power supply unit 100 for supplying power and an HVT 300 for generating a high voltage by the power supplied through the power supply unit 100. And an output adjuster 200 for selectively supplying power supplied from the power supply unit 100 to the HVT 300 so as to have different output levels from the HVT 300 according to a user's request. And a control unit 400 for outputting a control signal to the output adjusting unit as required.                     

The output adjuster 200 may include a first relay 201 for supplying power to the HVT 300 according to a control signal of the controller 400, and the HVT 300 according to a control signal of the controller 400. ) Is configured as a second relay 202 for outputting to the first and second levels having different output levels.

The control apparatus of the microwave oven according to the present invention configured as described above starts cooking according to a user's request when power is supplied through the power supply unit 100, and at this time, the first relay 201 is turned on and the second Relay 202 is connected to contact B to drive the HVT 300 with a second output.

When the output switching time is detected while the HVT 300 is driven, the control unit 400 turns off the first relay RY1 201, leaves room for a predetermined first set time, and then the second relay ( RY2) 202 is moved from B to A to control the HVT 300 to be driven by a first output.

In addition, the HVT 300 may be driven by turning on the first relay RY1 201 after a delay for a preset second set time, and at this time, a delay time for the second set time. Is to eliminate the magnetic flux remaining in the HVT 300 by the previous output.

Therefore, since the residual magnetic flux remaining in the HVT 300 causes the inrush current, the inrush current can be minimized by removing the residual magnetic flux.

The control method of the microwave oven according to the present invention configured as described above will be described with reference to FIG. 3. First, when the user inputs a power-on command, the HVT 300 is driven with the second output (S101 to S102).

Then, it is determined whether the output switching condition (S103).

Subsequently, the determination result (S103), the first relay (RY1) is turned off if the output switching condition (S104).

In operation S105, it is determined whether the first preset time has elapsed.

As a result of the determination (S105), if the predetermined first set time has elapsed, the contact point of the second relay RY2 is moved to switch to the first output (S106).

When the second preset time has elapsed, the first relay is driven and the HVT 300 is driven by the first output (S107 to S108).

Finally, if the power off command is input (S109).

As described above, in the microwave oven according to the present invention, when the output of the HVT 300 is driven by a plurality of output levels to the first output level and the second output level, when the output switching is required during cooking, the first By selectively driving the relay 201 and the second relay 202, the inrush current generated by the output change can be minimized.

As described above, the apparatus and method for controlling a microwave oven according to the present invention have the following effects.

First, when the output switching request has a plurality of output levels, the residual magnetic flux remaining in the HVT can be eliminated by selectively driving the first relay and the second relay with a certain margin.

Second, inrush current caused by residual magnetic flux can be minimized.

Third, since the inrush current can be minimized, the HVT can be driven more stably.

Claims (5)

In a microwave oven with a power supply, HVT for generating a high voltage by the power supplied through the power supply; An output adjuster selectively supplying power supplied from the power supply to the HVT so as to have different output levels in the HVT according to a user's request; And, And a control unit for outputting a control signal to the output adjustment unit so that time control can be performed when power is supplied from the output adjustment unit to the HVT according to a driving condition. The method of claim 1, The output adjusting unit A first relay for supplying power to the HVT according to the control signal of the controller, and a contact point is moved to output the first and second levels having different output levels through the HVT according to the control signal of the controller Control device of a microwave oven, characterized in that consisting of a second relay. In the method of controlling a microwave oven having an HVT, a first and a second relay, Selecting a course desired by the user and inputting an operation command; Performing an operation according to the selected course when the operation command is input, and determining whether an output switching condition is present; And, And selectively controlling driving of the first and second relays according to whether the output switching condition is satisfied. The method of claim 3, wherein Determining whether or not the output switching condition is The control method of the microwave oven, characterized in that the step of determining when the preset set time or other load is operated. The method of claim 3, wherein Selectively controlling driving of the first and second relays And controlling the first relay and the second relay to be selectively driven according to the output switching condition, and controlling the contact movement during the driving of the second relay.

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