KR20000025547A - Circuit for controlling hood fan of combination microwave and hood fan - Google Patents

Abstract

PURPOSE: A circuit for controlling a hood fan of a combination microwave and the hood fan is provided to drive the hood fan at any time. CONSTITUTION: A circuit for controlling a hood fan of a combination microwave and the hood fan comprises: a rotary hood fan for radiating heat by an operation of a microwave, and for emitting smoke generated from an outer heating apparatus; a first control switch for controlling so that outer power supply can be supplied to the hood fan, when a request for operating the hood fan is occurred from the outer heating apparatus; and a second switch for controlling the power supply of the hood fan, when a request for operating the hood fan is occurred according to the operating of the microwave. The controlling circuit is driven regardless of malfunction of products when the operation of the hood fan is necessary.

Description

Hood fan control circuit for microwave oven with hood fan

The present invention relates to a hood fan control circuit of a microwave oven with a hood fan, and more particularly, to a hood fan control circuit of a microwave oven with a hood fan that can drive a hood fan at any time if necessary.

A hood pan combined microwave refers to a hood fan for releasing smoke or odor generated when cooking in a kitchen, and a microwave oven driven by electricity for simple cooking.

Therefore, the hood fan provided in the microwave oven with the hood pan is driven when cooking is made in the microwave itself, and when it is necessary to discharge the smoke or smell of the kitchen regardless of the operation of the microwave oven. It may become. Thus, the hood fan should be configured so that the operation can be performed irrespective of the operation of the microwave oven, and this is done by wiring of power supplied to the hood fan.

Referring to FIG. 1, a hood fan control circuit of a conventional microwave oven with a hood fan, a fuse 15 and an oven thermostat 20 are connected in series to one side of a first power source applied from the outside. The fuse 15 cuts off the power supply when the wire is cut off when the overvoltage is applied, and the oven thermostat 20 senses the temperature of the oven that rises according to the operation of the microwave oven and cuts off the overheating. To cut off the flow of power.

The other side of the oven thermostat 20 is connected to the microcontroller 45, so that the microcontroller 45 is supplied with power through the oven thermostat. In addition, the other side of the oven thermostat 20 is connected to the common terminal Com of the first switch 35 and the second switch 40 which determine the speed of the hood fan to be described later. That is, the first switch 35 and the second switch 40 input the first power applied through the oven thermostat by the common terminal.

The first switch 35 has two terminals for determining the speed of the hood fan, and the first terminal NC is connected in series with a base the stat 30 to control the hood fan 25. Supply power to 1 terminal. The base thermostat 30 is a switch that is operated when the temperature of the heating mechanism installed in the lower portion of the microwave oven without the hood fan is raised, regardless of the operation of the microwave oven, and when the temperature rises above the set value. Therefore, when the base thermostat 30 is operated, the hood fan 25 is rotated at the first speed (speed1). This is because the initial state of the first switch 35 maintains the state where the common terminal com is connected to the terminal NC.

The second terminal NO of the first switch 35 directly supplies power to the second terminal of the hood fan 25, and the speed determined at this time is the second speed2. The control of the common terminal of the first switch 35 is performed by the microcontroller 45.

The second switch 40 has one terminal NC in addition to the common terminal Com, which is connected to the first terminal of the hood fan 25. In addition, operation control of the second switch 40 is performed by the microcontroller. That is, when the second switch 40 is operated, the hood fan 25 is rotated at the first speed.

The common terminal Com of the hood fan 25 is connected to one side of a second power source applied from the outside. Similarly, the microcontroller also connects one side of the power input terminal to one side of the second power source.

An operation process of the conventional hood fan combined microwave hood fan control circuit according to the above configuration will be described.

The microcontroller 45 inputs the first power to the first terminal through the fuse 15 and the oven thermostat 20, and supplies the second power through the second terminal directly connected to the external power input terminal 10. It is driven by input.

The first power source passing through the fuse 15 and the oven thermostat 20 is applied to the common terminal Com of the first and second switches 35 and 40. At this time, the microcontroller 45 determines the speed of the hood fan 25 by controlling the operation of the first or second switch.

In general, when the rotation speed of the hood fan 25 is to be the second speed, the microcontroller 45 connects the common terminal to the second terminal NO by turning on the first switch 35. Then, the first power applied to the common terminal of the first switch 35 is supplied to the hood fan 25 through the second terminal. Therefore, the hood fan 25 is driven at a second speed by the first power applied through the first switch 35 and the second power applied through the common terminal com.

Next, when the rotation speed of the hood fan 25 is to be controlled at the first speed, the microcontroller 45 turns on the second switch 40. Then, the first power applied to the common terminal com of the second switch 40 is applied to the first terminal of the hood fan 25, and the second power applied to the common terminal of the hood fan 25 is connected. The hood fan 25 is rotated at the first speed.

On the other hand, in the state in which the microcontroller 45 is turned off the first and second switches 35 and 40, when the temperature of the heating mechanism located under the hood pan combined microwave oven is raised, the base thermostat 30 On operation is performed regardless of the operation of the first and second switches. At this time, since the first switch 35 connects the common terminal com to the first terminal NC in the initial state, the first power applied through the fuse 15 and the oven thermostat 20 is the above-mentioned. It is supplied to the first terminal of the hood fan 25 through the terminal NC of the first switch 35 and the base thermostat 30. Therefore, when the base thermostat 30 is operated, the hood fan 25 is rotated at the first speed.

However, according to the conventional circuit configuration, when the base thermostat 30 is operated, power supplied to the hood fan 25 passes through the fuse 15 and the oven thermostat 20 unconditionally. Therefore, when the oven thermostat 20 or the fuse 15 is broken, even if the base thermostat 30 is turned on, the hood fan 25 is not driven because it does not receive power.

Accordingly, an object of the present invention is to provide a hood fan control circuit of a microwave oven with a hood fan that can drive the hood fan whenever necessary.

1 is a configuration diagram showing a hood fan control circuit of a conventional hood fan combined microwave oven,

Figure 2 is a block diagram showing a hood fan control circuit of a microwave oven with a hood fan according to the present invention.

In order to achieve the above object, a hood fan control circuit of a microwave oven and a hood fan according to the present invention includes a hood fan that rotates to dissipate heat generated by driving the microwave or to release smoke generated from an external heating device; A first control switch for controlling an external supply power to be supplied directly to the hood fan when an operation of the hood fan is requested from an external heating device; And a second control switch for controlling a supply power of the hood fan when an operation of the hood fan is requested by driving the microwave oven.

The hood fan control circuit of the microwave oven with the hood fan according to the present invention allows the drive to be performed when the hood fan is required to be driven regardless of the operation of the product.

Therefore, the hood fan control circuit of the hood pan combined microwave oven of the present invention is characterized by using a three-terminal base thermostat.

Hereinafter, a hood fan control circuit of a microwave oven with a hood fan according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram showing a hood fan control circuit of a microwave oven with a hood fan according to the present invention.

The hood fan control circuit of the present invention includes an input terminal 100 for inputting first and second powers applied from the outside, a fuse 115 at one side of the first power line input from the input terminal 100, The oven thermostat 120 is connected in series. The fuse 115 cuts off the power supply when the wire is disconnected when the overvoltage is applied, and the oven thermo stat 120 senses the temperature of the oven that rises according to the operation of the microwave oven and cuts off the overheat. To cut off the flow of power.

The other side of the oven thermostat 120 is connected to the microcontroller 145, so that the microcontroller 145 is supplied with a first power through the oven thermostat.

Meanwhile, a common terminal com of the base thermostat 130 is connected to the first power line input from the input terminal 100. In particular, the base thermostat 130 is located in front of the fuse 115 and the oven thermostat 120. This is to prevent the power supplied to the base thermostat 130 from being affected by the fuse 115 and the oven thermostat 120.

The common terminal Com of the first switch 135 and the second switch 140 that determine the speed of the hood fan are connected to the first terminal NC of the base thermostat 130. That is, the first switch 135 and the second switch 140 input the first power applied through the base thermostat 130 from the common terminal.

When the first switch 135 is turned on, the terminal NC connected to the common terminal is connected to the second terminal speed2 of the hood fan 125, and when the power is applied to the second terminal, the hood fan is Since the hood fan 125 is rotated at the second speed, the hood fan 125 is rotated at the second speed by the power applied from the first switch 135.

When the second switch 140 is turned on, the terminal NC connected to the common terminal is connected to the first terminal speed1 of the hood fan 125. That is, when the second switch 140 is operated, the hood fan 25 is rotated at the first speed. The on / off operation of the first and second switches 135 and 140 is controlled by the microcontroller 145.

The base thermostat 30 is a switch that is operated when the temperature of the heating mechanism installed in the lower portion of the microwave oven without the hood fan is raised, regardless of the operation of the microwave oven, and when the temperature rises above the set value. Therefore, when the base thermostat 130 is operated, the hood fan 125 should operate regardless of the operation of the microwave oven.

For this configuration, another terminal NO of the base thermostat 130 is connected to the first terminal speed1 of the hood fan 125. Since the common terminal of the base thermostat 130 is directly connected to the external power input terminal 100, when the base thermostat 130 is operated, the common terminal is connected to the terminal (NO), the hood fan Power is supplied to the first terminal speed1 of 125.

The common terminal Com of the hood fan 125 is connected to one side of a second power source applied from the outside. Similarly, the microcontroller 145 is also connected to one side of the second power line input from the power input terminal 100.

Next will be described the operation of the hood fan control circuit of the microwave oven with a hood fan according to the present invention having the above configuration.

The microcontroller 145 inputs a first power source to the first terminal through the fuse 115 and the oven thermostat 120, and receives the second power source through a second terminal directly connected to the external power input terminal 100. It becomes the state which can be driven by input.

In the initial state of the base thermostat 130, since the common terminal com is connected to the terminal NC, the power input from the external power input terminal 100 is provided through the base thermostat 130. The state is applied to the common terminal com of the first and second switches 135 and 140.

Therefore, when the hood fan 125 is to be rotated at the first speed by the control from the outside, the microcontroller 145 turns on the second switch 140.

Then, the power applied to the common terminal of the second switch 140 is applied to the first terminal of the hood fan 125 through the terminal NC, and the hood fan 125 is the first by the applied power. Rotate at speed.

When the hood fan 125 is to be rotated at the second speed, the microcontroller 145 turns on the first switch 135.

Then, the power applied to the common terminal of the first switch 135 is applied to the second terminal of the hood fan 125 through the terminal NC, and the hood fan is operated at the second speed by the applied power. Rotate The above control operation is a process that is controlled when the fan 125 needs to rotate according to the driving of the microwave oven.

Next, an operation process of the hood fan 125 made regardless of the operation of the microwave oven will be described.

In the state in which the first and second switches 135 and 140 are turned off in the microcontroller 145, the base thermostat 130 is turned on when the temperature of the heating mechanism located under the hood pan combined microwave oven is raised.

When the operation of the base thermostat 130 is turned on, the common terminal com of the base thermostat 130 is connected to the terminal NO while being switched from the initial state to the opposite state. Then, while the terminal NC connected to the first and second switches 135 and 140 is in an open state, the power supplied to the first and second switches 135 and 140 is cut off.

At the same time, the power input from the external power input terminal 100 is supplied to the hood fan 125 through the common terminal com and the terminal NO of the base thermostat 130. Thus, the hood fan 125 can be rotated at a first speed.

That is, in the hood fan control circuit according to the present invention, when the base thermostat is operated, the power supply is supplied to the hood fan through the base thermostat irrespective of the microcontroller, the fuse, the oven thermostat, and the hood fan rotates. do.

As described above, the hood fan control circuit of the microwave oven with the hood fan according to the present invention is intended to realize a function in which the hood fan can be driven regardless of abnormal operation of the product under a specific situation. Therefore, the present invention is configured so that the operation of the hood fan always using the three-terminal base thermostat, simply by changing the three-terminal base thermostat and wiring without the addition of new parts, reducing the production cost of the product It can work.

Claims (2)

A hood fan rotating to dissipate heat generated by driving the microwave oven or to release smoke generated from an external heating device; A first control switch for controlling an external supply power to be supplied directly to the hood fan when an operation of the hood fan is requested from an external heating device; And a second control switch for controlling a supply power of the hood fan when an operation of the hood fan is requested by driving the microwave oven. The method of claim 1, The first control switch is a three-terminal switch, the first terminal is connected to the second control switch, the second terminal is directly connected to the hood fan, the third terminal is a terminal for selecting the first terminal or the second terminal A hood fan control circuit for a microwave oven with a hood fan.