KR100210070B1 - Timer motor operation apparatus for microwave oven - Google Patents

Abstract

The present invention is a microwave oven capable of simplifying the insulation structure of the timer motor by driving the timer motor at a constant low voltage output from the tab formed in the windings of the fan motor, regardless of the rated voltage of each country The present invention relates to a timer motor driving apparatus, and more particularly, to a fan motor for driving a cooling fan by receiving a power supply voltage applied from an external source and outputting a constant low voltage through a tap with a low- And a timer motor which operates by receiving a constant low voltage from a tap of the timer.

Description

Timer motor drive unit of microwave oven

FIG. 1 is a circuit diagram of a timer motor driving circuit of a conventional microwave oven; FIG.

FIG. 2 is a circuit diagram of a timer motor driving apparatus of a microwave oven according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: AC power input unit 13: Timer switch

15: drive switch 17: safety switch

20: filter means 30: fuse

40: Timer motor 50: Fan motor

70: high frequency output means 71: high voltage transformer

73: Magnetron

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timer motor driving apparatus for a microwave oven and more particularly to a timer motor driving apparatus for a timer motor of a microwave oven which enables a timer motor to be unified by driving a timer motor at a constant low voltage output from a tap formed in the middle of a winding of a fan motor ≪ / RTI >

Generally, as shown in FIG. 1, the timer motor driving circuit of the conventional microwave oven is provided with various switches 13, 15 (not shown) for performing an "on" operation and an " A filter means 20 for removing noise by receiving a commercial AC power supplied from the AC power input unit 10, and a control unit 20 for applying a power source voltage of a commercial AC power source, A fan motor 50 for driving the cooling fan, a high frequency output unit 70 for receiving a power supply voltage of the commercial AC power and outputting a high frequency, And a timer motor (40) which is operated only to output high frequency from the high frequency output means (70).

In the timer motor driving circuit of the conventional microwave oven configured as described above, when the user inputs desired cooking time and cooking menu, the power supply voltage of the commercial AC power of the AC power input unit 10 is controlled by the control means (not shown) The timer switch 13 is turned on and applied to the filter means 20 and then the capacitor filter C4 of the filter means 20 and the coil L and the resistor L connected in parallel with the coil L Noise is removed by the capacitor R and the capacitors C2 and C3.

At this time, the safety switch 17 and the drive switch 15 are turned on by the control of the control means (not shown) so that the power supply voltage of the commercial AC power is supplied to the high frequency output means 70 and the fan motor 50, And the timer motor 40. The high frequency output means 70 outputs a high frequency to start heating the food and the fan motor 50 drives the cooling fan. The timer switch 13 is operated by the control means (not shown) so that the high frequency is outputted from the high frequency output means 70 and the user turns off the cooking timer. The operation was supposed to be terminated.

However, since the timer motor of the conventional microwave oven configured in this manner is driven by directly receiving the power supply voltage of the commercial AC power supplied from the AC power input unit, the timer motor must be separately developed for each rated voltage of each country in the world, The motor itself must have a complicated insulation structure for safety reasons.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a timer motor of a microwave oven which can unify a timer motor regardless of the rated voltage of each country and simplify the insulation structure of the timer motor itself Device.

In order to achieve the above object, a timer motor driving apparatus of a microwave oven according to the present invention is a device for driving a cooling fan by receiving a power supply voltage applied from the outside, and a low-voltage tap is formed in the middle of the winding, A fan motor for outputting a constant low voltage, and a timer motor operated by receiving a predetermined low voltage from a tap of the fan motor.

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

2, the timer switch 13 is a switch for applying the power supply voltage of the commercial AC power supplied from the AC power input section 10 to the filter means 20 and is connected to one end of the AC power input section 10 A switch to be applied to the filter means 20 is connected between one end of the AC power input portion 10 and the contact between the capacitor filter C4 of the filter means 20 and one end of the coil L, On 'operation and an' off 'operation under the control of the control unit (not shown).

The filter means 20 eliminates the noise of the power supply voltage of the AC power source applied through the timer switch 13 and is connected in parallel with the capacitor filter C4, the coil L, It consists of a connected resistor R and capacitors C2 and C3.

The fuse 30 is connected between the coil L and the resistor R of the filter means 20 and the capacitors C2 and C3 so as to block the power supply voltage supplied through the filter means 20 when an over- And the contact between one end of the high-voltage transformer 71 of the high-frequency output means 70 and the contact between the fan motor 50 and the high-

The high frequency output means 70 receives a power supply voltage supplied through the filter means 20 and outputs a high frequency so as to heat the food. The power supply voltage of the commercial AC power supplied through the filter means 20 is set to 1 A magnetron 73 for receiving a high pressure converted by the high-pressure transformer 71 and a magnetron 73 for generating high-frequency waves and a high-voltage transformer 71 for generating a high- A high-voltage capacitor C1 for charging a voltage induced in the secondary winding, and a high-voltage diode D1 for rectifying the voltage charged in the high-voltage capacitor C1 to a high voltage and a low voltage.

The safety switch 17 is a switch for preventing high frequency leakage and is provided between one end of the high voltage transformer 71 and the contact between the fan motor 50 and the timer motor 40 and one end of the drive switch 15 (Not shown) to perform an 'on' operation and an 'off' operation.

The drive switch 15 is a switch for driving the fan motor 50. The drive switch 15 is a switch for driving the fan motor 50. The drive switch 15 is connected to the contact point of the resistor R, And the timer motor 40 and the contact point of one end of the safety switch 17 to perform an 'on' operation and an 'off' operation under the control of a control means (not shown).

The fan motor 50 receives the power supply voltage supplied through the filter means 20 and drives the cooling fan to cool the magnetron 73 when the magnetron 73 is driven. 50 are connected to each other to form a tab that is synchronized with a constant low voltage so that a constant low voltage is output to the tab to drive the timer motor 40. The contact between the fuse 30 and one side of the high- A tab which is connected between the drive switch 15 and the safety switch 17 and one end of the timer motor 40 and which is synchronized with a constant low voltage in the middle of the windings of the fan motor 50 is connected to a timer motor 40 As shown in FIG.

The timer motor 40 outputs a high frequency from the high frequency output means 70 only during a cooking time desired by the user. The timer motor 40 generates a constant low voltage And between the safety switch 17 and the contact point of one end of the fan motor 50. As shown in Fig.

Hereinafter, the operation and effect of the timer motor driving apparatus of the microwave oven constructed as described above will be described.

First, when the user inputs desired cooking time and cooking menu, the timer switch is turned on by the control of the control means (not shown), and the power supply voltage of the commercial AC power supplied from the AC power input unit 10 is supplied to the filter .

The power supply voltage of the commercial AC power supplied from the AC power input unit 10 is inputted to both ends of the capacitor filter C4 and is connected in parallel with the capacitor filter C4 and the coil L and the coil L The noise is removed while passing through the resistor R and the capacitors C2 and C3 and applied to the fan motor 50 and the high frequency output means 70.

At this time, the drive switch 15 and the safety switch 17 are turned on by the control of the control means (not shown).

Therefore, the power supply voltage of the commercial AC power supplied from the AC power input unit 10 is applied to the primary side of the high-voltage transformer 71 of the high-frequency output means 70 and is converted to the high voltage while being induced to the secondary side.

Accordingly, in the magnetron 73, a high voltage induced in the secondary side of the high-voltage transformer 71 is applied to generate a high frequency wave to start heating the food.

The power supply voltage of the commercial AC power supplied from the AC power input unit 10 is input to both ends of the fan motor 50 to drive the cooling fan and a constant low voltage and synchronous Is applied to the timer motor (40).

Accordingly, the timer motor 40 is driven so that a high frequency is output from the high frequency output means 70 only for a desired cooking time. When the cooking time has elapsed, the timer motor 40 stops operating, (Not shown), the timer switch 13 is turned off and the entire operation is ended.

As described above, in the timer motor driving apparatus of the microwave oven according to the present invention, the power supply voltage of the commercial AC power supplied from the AC voltage input unit is input to both ends of the fan motor to drive the cooling fan, Since the timer motor is driven by the constant low voltage from the tap that is synchronized with the constant low voltage in the middle, the timer motor can be unified regardless of the rated voltage of each country and the insulation structure of the timer motor itself can be simplified. There is an excellent effect that the cost can be saved.

Claims (1)

A fan motor having a tab formed at a predetermined position of the stator winding and transforming a commercial AC voltage applied from outside through the tab to a constant low voltage and outputting the voltage; And a timer motor for driving the timer of the microwave oven.