KR20050081731A - Circuit for driving motor using printed circuit board's power of the microwave oven - Google Patents

Abstract

The present invention relates to a motor driving circuit using a circuit board voltage of a microwave oven capable of driving a motor using a printed circuit board (PCB) voltage of a microwave oven. In a microwave oven using a magnetron as a heating source, A voltage transformer for receiving an AC power supply to generate a constant voltage required for a printed circuit board; And a motor connected to the secondary side of the voltage transformer and driven by a constant voltage output from the voltage transformer. Therefore, according to the present invention, the motor can be freely controlled in the circuit board by driving the microwave oven using the voltage of the circuit board, and there is no need to design additional tabs or components (relays, etc.) and thus the cost of the product. And there is an advantage that can reduce the number of wiring.

Description

Circuit for Driving Motor Using Printed Circuit Board's Power of The Microwave Oven}

The present invention relates to a microwave oven, and more particularly, to a motor driving circuit using a circuit board voltage of a microwave oven to drive a motor using a printed circuit board (PCB) voltage of a microwave oven.

Recently, as a device for cooking at home, a gas range, a gas oven, a microwave oven, an electric oven and the like have been widely used.

Here, the microwave oven is a device that performs cooking by heating a cooking object in a cavity using a microwave generated from a built-in magnetron (MGT) as a main heating source.

In general, the configuration of the microwave oven (not shown) includes a cooking chamber for embedding a heating object by supplying microwaves to the inner center of the cavity assembly forming the basic frame of the microwave oven. An electrical chamber is installed in which electrical components for generating waves are mounted.

Here, the cooking chamber is configured to be opened and closed by a door to a space for heating the food by the microwave supplied from the magnetron to settle the food to be cooked.

In addition, the inside of the electric compartment is a magnetron for oscillating microwaves, a high voltage converter for applying high pressure to the magnetron, and an air flow for cooling various electric parts in the electric compartment and passing through the inside of the cooking chamber. Blower fan for forming the

Hereinafter, the motor driving circuit of the microwave oven according to the prior art will be described.

As shown in FIG. 1, a motor driving circuit of a microwave oven according to the related art includes a power input unit (not shown) for receiving 220V / 60 kV AC power, and AC power input through the power input unit. Primary switch 1 for switching to supply to the oven, oven lamp (2) to turn on to check the food inside the cooking chamber, and turntable (not shown) for placing food A turntable motor (3) to be driven, a fan motor (4) for driving a blowing fan for cooling the electrical equipment room including a cooking chamber, a first relay (5) for controlling the operation of the oven lamp (2), and A second relay 6 for controlling the operation of the fan motor 4, and a system control unit (not shown) for controlling the entire system in accordance with the cooking command of the user.

In the motor driving circuit of the microwave oven configured as described above, the system control unit turns on the switching unit 1 when the main power source (220V AC power) is applied, and according to the cooking instruction of the user, the oven lamp 2 and the turntable motor ( 3), switching control of the first and second relays 5, 6 to drive the fan motor 4;

In other words, when the first and second relays 5 and 6 are turned on under the control of the system controller, the oven lamp 2, the turntable motor 3, and the fan motor 4 are driven.

At this time, the fan motor 4 is composed of three tabs (Tab) as shown in FIG.

In addition, the turntable motor 3 is connected to the fan motor 4 using an intermediate tap as shown.

In the above-described conventional microwave oven, as shown in FIG. 3, three taps are configured to allow the 220V voltage (A) and the 12V voltage (B) to be induced in the fan motor coil, so that the fan motor is connected to the taps of 0V and 220V. (4) and the turntable motor 3 or the timer motor 7 for counting the cooking time corresponding to the cooking instruction of the user to the tap of 0V and 21V.

That is, it has a system structure which drives the fan motor 4 by 22V voltage, and connects the turntable motor 3 or the timer motor 7 by removing the middle tap 21V (B) of the said fan motor coil.

However, the above-described motor driving circuit of the microwave oven according to the related art has the following problems.

First, since the fan motor of three taps is configured to connect the turntable motor or the timer motor using the 21V voltage of the middle tap, the workmanship is increased due to the increase in the connection terminals.

Second, the fan cost was increased by designing three fan taps to supply 220V and 21V.

Accordingly, the present invention has been made to solve the above problems, the motor using the circuit board voltage of the microwave oven to drive the motor using a circuit board (PCB) voltage to control the motor more efficiently The purpose is to provide a driving circuit.

In order to achieve the above object, a motor driving circuit using a circuit board voltage of a microwave oven according to the present invention is a microwave oven using a magnetron as a heating source, and receives AC power from an external source to a printed circuit board. A voltage transformer for generating the required constant voltage; The motor is connected to the secondary side of the voltage transformer and is driven by a constant voltage output from the voltage transformer.

At this time, the motor is characterized in that the turntable motor for driving the turntable (Turn Table) or a timer motor for counting the cooking time.

In addition, the motor has one end connected to the secondary side of the voltage transformer and the other end connected to one end of the main relay connected to the secondary side of the voltage transformer, the voltage when the main relay is switched in accordance with a cooking instruction of the user It is characterized by driving by the constant voltage output from the transformer.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of a motor driving circuit using a circuit board voltage of a microwave oven according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 4, the motor driving circuit using the circuit board voltage of the microwave oven according to the present invention uses an AC power source (220 V / 60 kV) externally in a microwave oven using a magnetron (not shown) as a heating source. A power input unit (not shown) for receiving input, a primary switch 10 for switching AC power input through the power input unit to the entire system, and a light to check food in the cooking chamber An oven lamp 20, a fan motor 30 for driving a blowing fan (not shown), a first relay RY1 50 for controlling the operation of the oven lamp 20, And a second relay (RY2) 60 for controlling the operation of the fan motor 30 and AC power supplied from the power input unit to generate a constant voltage (12V) required for a printed circuit board (PCB). A voltage transformer 70 and the voltage transformer Connected to the secondary side (70) is configured to include a motor driven by a constant voltage output from the voltage transformer 70.

In this case, the motor is a turntable motor 40 for driving a turntable or a timer motor (not shown) connected in parallel with the turntable motor 40 to count cooking times.

Referring to the operation of the motor driving circuit using the circuit board voltage of the electronic lane according to the present invention configured as described above are as follows.

First, the system controller recognizes when AC power is applied through the power input unit, turns on the switching unit 10 to supply power to the whole system, and when a cooking command is input from the user, the first and second relays. Turn on (50, 60).

The oven lamp 20 and the fan motor 30 are driven according to the switching operation of the first and second relays 50 and 60.

At this time, the oven lamp 20 and the fan motor 30 are each designed by two tabs (Tab).

The voltage transformer 70 receives AC power output from the power input unit and generates and outputs a constant voltage 12V required by the circuit board PCB.

In the microwave oven according to the present invention, one end of the turntable motor 40 is connected to the secondary side (A contact) of the voltage transformer 70 and the other end is connected to one end of the first relay 50.

At this time, the other end of the first relay 50 is connected to the secondary side (B contact) of the voltage transformer 70.

In addition, the turntable motor 40 may be driven by receiving the voltage of the secondary side of the voltage transformer 70, that is, the voltage of the circuit board, when the contact of the first relay 50 is turned on according to a cooking instruction of the user. do.

In other words, the turntable motor 40 is controlled according to the switching operation of the first relay 50 and is driven by the voltage between the A contact and the B contact, which is the secondary side of the voltage transformer 70.

When the contact point of the first relay 50 is turned off or the system power is turned off, the secondary voltage of the voltage transformer 70 supplied to the turntable motor 40 is cut off to stop the operation.

In the present invention, a relay (first relay 50, second relay 60, etc.) driven together with the start of cooking under the control of the system control unit is applicable as a control means for operating the turntable motor 40. Do.

In addition, a timer motor (not shown) connected in parallel with the turntable motor 40 is also driven by the voltage of the circuit board according to the switching operation of the first relay 50.

Accordingly, the present invention is a motor drive circuit designed to drive a motor (turntable motor or timer motor, etc.) of a microwave oven using the voltage 12V of a circuit board.

The motor driving circuit using the circuit board voltage of the microwave oven according to the present invention as described above has the following effects.

First, the motor can be freely controlled in the circuit board by driving the motor of the microwave oven using the voltage of the circuit board.

Second, by using a circuit board voltage to drive a turntable motor or a timer motor, there is no need to design additional taps or components (relays, etc.), thereby reducing product cost and reducing wiring man-hours.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

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

2 is a view showing a connection state of a fan motor and a turntable motor of the prior art;

Figure 3 is a view showing a circuit connection state of the motor according to the prior art

4 is a diagram illustrating a motor driving circuit using a circuit board voltage of a microwave oven according to the present invention.

* Explanation of symbols for main parts of the drawings

10: switching unit 20: oven lamp

20: fan motor 40: turntable motor

50: first relay 60: second relay

70: voltage transformer

Claims (3)

In the microwave oven which uses a magnetron as a heating source, A voltage transformer for receiving an AC power from an external source to generate a constant voltage required for a printed circuit board; And, And a motor connected to the secondary side of the voltage transformer and driven by a constant voltage output from the voltage transformer. The method of claim 1, The motor is A motor driving circuit using a circuit board voltage of a microwave oven, characterized in that it is a turntable motor for driving a turntable or a timer motor for counting cooking time. The method of claim 2, The motor is One end is connected to the secondary side of the voltage transformer and the other end is connected to one end of the main relay connected to the secondary side of the voltage transformer, the constant voltage output from the voltage transformer when the main relay is switched according to a user's cooking instruction A motor drive circuit using the circuit board voltage of the microwave oven, characterized in that driven by.