KR200186693Y1 - Circuit for driving of microwave oven - Google Patents

Abstract

The present invention relates to a driving circuit of a microwave oven in which a timer motor capable of operating at a low voltage is applied. In a microwave oven having a timer knob, a first switch which is turned on / off according to opening and closing of a door after power is applied, and rotation of the timer knob A second switch that is turned on or off depending on whether or not, a first motor that is driven by receiving a low voltage of a predetermined level according to the on / off of the second switch, and a low voltage of a predetermined level according to the on / off of the second switch It is composed of a second motor to supply a terminal to one terminal of the first motor. Instead of a timer motor driven by receiving a high voltage, a timer motor operable at a low voltage minimizes power consumption and uses a low-cost low-voltage motor. There is an effect that can lower the manufacturing cost.

Description

Circuit for driving of microwave oven

The present invention relates to a microwave oven, and more particularly to a microwave oven to which a low voltage motor is applied.

As shown in FIG. 1, a driving circuit of a general microwave oven includes a power supply unit 1, a first filter 2 for filtering out noise of power inputted through the power supply unit 1, and a power supply unit 1. 1 to 3 switches (3) (4) and (5) are turned on or off according to whether the time knob (not shown) is rotated after the power is applied, or is driven according to the on / off of the second switch (4). First to third motors (6) (7) (8), the AC relay (10) whose operation is determined according to the on / off of the third switch (5), and the AC relay ( A high voltage generator T2 for generating a high voltage by inducing a voltage according to whether the 10 is driven; a second filter 12 for filtering a power of a predetermined level from the voltage generated by the high voltage generator T2; It is composed of a magnetron 13 for receiving and oscillating the power filtered by the second filter 12. Here, the reference numeral is the fourth switch 14.

Here, the first motor 6 is a timer motor, the second motor 7 is a turn table motor, and the third motor 8 is a fan motor.

The operation of the driving circuit of the microwave oven configured as described above is as follows.

First, when the user applies power to the power supply unit 1, the noise signal is filtered through the first filter 2, and the first switch 3 is turned on according to whether the power supply unit 1 is powered or the door is opened. On / off is determined.

Therefore, when the first switch 3 is turned on, the door (not shown) is closed, and the fourth switch 14 is turned on at the same time as the first switch 3 is turned on.

Subsequently, when the timer knob (not shown) is rotated while the first switch 3 is turned on, the second switch 4 and the third switch 5 are turned on to drive the AC relay 10. When the relay 10 is turned on, an input voltage is applied to the high voltage generator T2 to oscillate the magnetron 13. Thus, the microwave oven operates as the magnetron 13 oscillates.

As described above, the driving circuit of the microwave oven according to the related art has a problem of causing an increase in manufacturing cost due to unnecessary power consumption by using a high voltage input as a driving power of a timer motor.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a driving circuit of a microwave oven using a timer motor capable of operating at low voltage.

1 is a circuit diagram showing a driving circuit of a microwave oven according to the prior art

2 is a circuit diagram showing a driving circuit of a microwave oven according to the present invention;

Explanation of symbols for main parts of the drawings

21: power supply 22: first filter

23: first switch 24: second switch

25: 3rd switch 26: 1st motor (time motor)

27: second motor 28: third motor

29: oven lamp 30: AC relay

31: second filter 32: magnetron

33: fourth switch

In the microwave oven according to the present invention for achieving the above object, the first switch is turned on / off according to the opening and closing of the door after the power is applied in the microwave oven having a timer knob, the on / off depending on whether the timer knob is rotated A second switch to be driven, a first motor driven by being supplied with a low voltage of a predetermined level according to on / off of the second switch, and according to a turn ratio of a coil at a power applied according to on / off of the second switch It is characterized by including a second motor for supplying a low voltage of a predetermined level to the first motor.

Hereinafter, with reference to the accompanying drawings will be described in more detail the operation of the driving circuit of the microwave oven according to the present invention.

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

As shown in FIG. 2, the driving circuit of the microwave oven according to the present invention includes a power supply unit 21, a first filter 22 for filtering a noise signal from power inputted through the power supply unit 21, and After the power is applied to the power supply unit 21, the first and second switches 23 and 24 are turned on and off depending on whether the time knob (not shown) is rotated, and the first and second switches 23 are turned on and off. AC relay that determines whether to operate according to the on / off of the first to third motors 26, 27 and 28, the oven lamp 29, and the second switch 24 to determine whether to drive. And a high voltage generator T12 for generating a high voltage by inducing a power applied to the primary side to the secondary side according to whether the AC relay 30 is driven or not. A second filter 31 for receiving and filtering power induced in the vehicle side, and receiving and oscillating the power filtered by the second filter 31; It consists of a magnetron 32 for generating a recognition drive signal. The first motor 26 is a timer motor, the second motor 27 is a turntable motor, and the third motor 28 is a fan motor.

The first switch 23 is turned on by closing the door (not shown) after applying power to the power supply unit 21. The second switch 24 and the third switch 25 are rotated by rotating the timer knob (not shown). ) Is turned on to drive the AC relay (30).

As the AC relay 30 is driven, input power is applied to the high voltage generator T12. When power is applied to the high voltage generator T12, the magnetron 32 is oscillated to operate the microwave oven.

In addition, the power of the 'L' stage is applied to the first to third motors 26, 27 and 28, the oven lamp 29, the power of the 'N' stage of the first motor 26 The low voltage is extracted according to the turn ratio of the coil wound around the third motor 28 from the power applied to the third motor 28, and is supplied to one terminal of the first motor 26.

Here, the first motor 26 is a motor operating at a low voltage, and pulls a tab capable of supplying a low voltage of about 27V according to a turn ratio of a coil wound on the third motor 28, and thus one side of the first motor 26. The first motor 26 is driven by supplying to the terminals.

As described above, the driving circuit of the microwave oven according to the present invention has the following effects.

First, power consumption can be minimized by using a timer motor that can operate at low voltage instead of a timer motor driven by high voltage.

Second, manufacturing cost can be lowered by using low-cost motors with low cost.

Claims (3)

In a microwave oven with a timer knob, A first switch that is turned on / off in response to opening and closing the door after power is applied; A second switch turned on / off depending on whether the timer knob is rotated; A first motor driven by being supplied with a low voltage of a predetermined level in response to the on / off of the second switch; And, And a second motor for supplying a low voltage of a predetermined level to one terminal of the first motor according to the on / off of the second switch. The method of claim 1, A low voltage at a predetermined level supplied to the first motor is 25 to 30V. The method of claim 1, Wherein the first motor is a timer motor, and the second motor is a fan motor.