KR100680982B1 - Installation for controlling night light of microwave oven - Google Patents

Abstract

Disclosed is a microwave night light control device for efficiently operating a backlight and a night light function of a microwave oven.

According to the present invention, in the control device for night light control of the microwave oven, the system for controlling the operation according to the cooking mode of the microwave, and for controlling the backlight on and off of the microwave in response to a user's selection key signal A microcomputer that generates a first control signal and a second control signal for controlling night light on / off of the microwave oven; And a light emitting part connected to the plurality of ports of the microcomputer and responding to the first control signal and the second control signal and emitting luminance corresponding thereto.

Therefore, the present invention controls each output port of the microcomputer to correspond to the backlight or night light mode of the microwave, so that the brightness of the light emitting diode is modified according to the output signal of each output port, thereby simplifying the circuit implementation for night lamp control. There is an effect, and also from this it is possible to reduce the production cost of the microwave.

Microwave, Night Light, Backlight, Night Light, Light Emitting Diode, High Brightness

Description

INSTALLATION FOR CONTROLLING NIGHT LIGHT OF MICROWAVE OVEN}

1 is a circuit diagram showing a night light control apparatus according to a conventional microwave oven.

Figure 2 is a circuit diagram showing a night lamp control apparatus according to the present invention.

3 is a diagram for describing a control pattern required for operation of FIG. 2.

<Explanation of symbols for main drawings>

LED: Light Emitting Diode, High Brightness Light Emitting Diode

R1, R2: resistance

P1-P4: Micom output port

The present invention relates to a microwave oven, and more particularly, a night light control apparatus of a microwave oven capable of performing a backlight function and a night light function by adjusting the brightness of a night lamp applied to a microwave oven. It is about.

In general, microwave ovens are widely used in homes and restaurants, and are widely used for cooking or cooking foods as income levels increase and life is improved. Therefore, as the usage of the microwave oven increases, the plug of the microwave oven is always connected to an outlet to which power is supplied, and when necessary, only the operation key of the microwave oven is pressed to operate the microwave oven in general.

In the electric room of the microwave oven, when a user performs a process of putting or removing food into the cooking chamber of the microwave in order to cook food, a lamp is provided to provide illumination to help this. The lamp maintains a turn-off state when the door of the microwave oven is closed, and turns on when the door of the microwave oven is opened, and serves to assist food intake by providing lighting of a predetermined brightness in the cooking chamber.

On the other hand, in the living room, kitchen or restaurant hall of the home where the microwave is located, in the middle of the night when human activity is reduced, the general lighting is turned off, and in case of sudden activity at night, only the night lighting which is lower in brightness than the general lighting is turned on. The night light is provided on the back of the microwave key panel. The night lighting is to turn on the lamp by using the standby power of the microwave oven, power consumption of 10Watt or more is generated.

In addition, the microwave oven includes an illumination lamp that is used as a backlight (Back Light) in a normal time, including a night light, and thus includes a backlight lighting circuit and a night lighting circuit. That is, as shown in FIG. 1, the microcomputer of the microwave oven controls the lights of the backlight and the night light by using two output ports.

As shown, the first port of the microcomputer is provided with a plurality of light emitting diodes (LED1, LED2, LED3) for turning on the backlight of the microwave oven, and resistors R1, R2, R3 are connected in series between the respective light emitting diodes. do. Then, the transistor TR1 for controlling the lighting of the plurality of light emitting diodes LED1, LED2, and LED3 is connected. A resistor R4 is connected to a base terminal of the transistor TR1, and a pull-down resistor R5 for stability of a signal input to the base terminal of the transistor TR1 is connected to the transistor TR1.

Therefore, when a key signal of a key input unit for performing backlight of the microwave is input, the microcomputer switches the first port to a high level. This inputs a backlight lighting signal to the base terminal of the transistor TR1. The transistor TR1 is turned on to conduct the collector side and the emitter side. For this reason, the plurality of light emitting diodes LED1, LED2, and LED3 connected to the collector side of the transistor TR1 are turned on with brightness according to the above-described resistors R1, R2, and R3. Of course, when a key signal for blocking the backlight of the microwave is generated, the first port of the microcomputer is switched to the low level, and the transistor TR1 is turned off. Therefore, each of the light emitting diodes LED1, LED2, and LED3 is turned off.

On the other hand, in order to perform the night light mode of the microwave oven, a high brightness light emitting diode LED4 is provided with a protection resistor R6, and the high brightness light emitting diode LED4 is directed to the emitter side of the transistor TR2. Connected. A resistor R8 is connected to the base side of the transistor TR2, and a resistor R7 is connected to the base side and the emitter side of the transistor TR2.

Therefore, when the night light lighting mode of the microwave oven is set, the microcomputer switches the second port to the high level. This turns on the transistor TR2 by supplying the base side of the transistor TR2 at a high level. As a result, the high brightness light emitting diode LED2 connected to the emitter side of the transistor TR2 is turned on. In addition, when the night light off mode of the microwave oven is set, the microcomputer switches the second port to a low level to turn off the transistor TR2. As a result, the high brightness light emitting diode LED2 is turned off to complete the night light off mode.

However, it is pointed out that the backlight and night illumination functions of the microwave oven configured as described above cause waste of components according to each circuit implementation because each circuit is implemented to selectively switch light emitting devices.

The present invention has been made to solve the above problems, and an object of the present invention is to achieve the night light function for backlight and night light of a microwave oven by controlling the brightness of the light emitting device, waste of parts due to unnecessary circuit implementation It is to provide a microwave night light control device that can prevent and increase the productivity of the product.

Night light control device of the microwave oven according to an aspect of the present invention for achieving the above object, in the control device for night light control of the microwave oven, to control the operation of the system according to the cooking mode of the microwave, the user's selection A microcomputer for generating a first control signal for controlling the backlight of the microwave and a second control signal for controlling the night light of the microwave in response to a key signal; And a first resistor (R1) and a second resistor (R2) connected in parallel with each other and having a different resistance value, including a light emitting diode (LED), and connected in series with the light emitting diode (LED). R1) is connected to the first output port P1 to respond to the first control signal of the micom, and the second resistor R2 is connected to the second output port P2 to respond to the second control signal of the micom. And a light emitting part connected to and responding to the first control signal and the second control signal and emitting luminance corresponding thereto.

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

Figure 2 is a block diagram showing a night light control device of the microwave oven according to the present invention. As shown, the microwave oven controls the system operation according to the cooking mode of the microwave oven, and in response to the user's selection key signal, the first control signal and the microwave for controlling the backlight on / off of the microwave oven. A microcomputer 201 for generating a second control signal for controlling night light on and off, and a light emitting unit connected to a plurality of ports of the microcomputer to emit brightness corresponding to the first control signal and the second control signal; 203).

The light emitting unit 203 includes a light emitting diode (LED), and the first resistor R1 and the second resistor R2 connected in parallel with each other with different resistance values are connected in series with the light emitting diode LED. The first resistor R1 is connected to the first output port P1 corresponding to the first control signal of the microcomputer 201, and the second resistor R2 is the second control of the microcomputer 201. It is connected to the second output port P2 corresponding to the signal.

In addition, at least two light emitting units 203 are formed, and an output port of the microcomputer 201 corresponding thereto will be used. In addition, it is preferable that a high brightness light emitting diode is used as the light emitting diode (LED) applied to the light emitting unit 203.

On the other hand, the first resistor (R1) is suitable for 330Ω, and the second resistor (R2) will be suitable for 600Ω.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings. 3 is a control diagram for explaining a control signal of the microcomputer according to the present invention.

As shown, when the backlight mode of the microwave oven is selected through an input port (not shown) of the microcomputer 201, the microcomputer 201 outputs the output of the first port corresponding to the backlight mode. Set to high level. If necessary, when there are two or more light emitting units 203 described above, the output of another output port, for example, the third port, is set to a high level. At this time, the second port and the fourth port of the microcomputer 201 are set to a low level.

A first resistor R1 is connected to the first port and the third port of the microcomputer 201, and the first resistor R1 has a lower resistance value than the second resistor R2. The magnitude of the resistance value for each of the resistors R1 and R2 described above may vary depending on the circuit design of the system, and the present invention is described as an embodiment. Therefore, setting the first port and the third port of the microcomputer 201 to the high level is provided through the second port and the fourth port where the current supplied through each light emitting diode (LED) is set to the low level. Will be.

Each of the light emitting diodes (LED) is connected in series with a second resistor (R2) of a second port and a second resistor (R2) of a fourth port, respectively, and the brightness of the light emitting diode (LED) is the second resistor (R2). Is determined by Since the first resistor R1 is lower than the resistance of the second resistor R2, the series connection structure of the LED and the second resistor R2 lowers the luminance of the LED.

That is, the microcomputer 201 supplies a high level signal to the first resistor R1 connected to the first port and the third port, so that the current for operating the light emitting diode LED is transferred to the first resistor R1. While not being introduced, the second resistor R2 is connected to the second and fourth ports of the microcomputer 201.

Meanwhile, when a night light mode according to a user setting is set as an input port of the microcomputer 201, the microcomputer 201 is configured as a second port (i) of the microcomputer 201 as illustrated in FIG. 3. P2) and the output of the fourth port P4 are set to high level. Of course, the first port P1 and the third port P3 of the microcomputer 201 are set at a low level.

Accordingly, as the microcomputer 201 receives a high level signal to the second port P2 and the fourth port P4, each light emitting diode LED is connected to the second port P2 and the fourth port P4. It may not be connected to the second resistor R2 connected by). On the other hand, as the microcomputer 201 supplies low-level signals to the first port P1 and the third port P3, each of the light emitting diodes LED is connected to the current through the first resistor R1. Is supplied.

As the first resistor R1 has a lower resistance value than the second resistor R2, the luminance of the light emitting diode LED is increased. Thus, the microcomputer 201 performs the night light mode. Thereafter, when the user stops the night light, that is, the backlight and the night light function through the key button of the microwave oven, the microcomputer 201 outputs the outputs of the first port P1 to the fourth port P4 described above. By setting the high level, it is possible to induce the light-emitting diode (LED) to turn off.

In addition, in the present invention, one or more light emitting units 203 are implemented to retain at least one light emitting unit 203, and at least two light emitting diodes forming one light emitting unit 203 may be included. The output port of the microcomputer 203 may be reduced. At this time, the resistance value for each of the resistors R1 and R2 connected to the output port of the microcomputer 203 should be modified.

As described above, the nighttime lamp control apparatus of the microwave oven according to the present invention is connected to a plurality of output ports of the microcomputer for operating control of the cooking mode of the microwave, connecting different resistors, and the other ends of the different resistors in parallel After connecting the light emitting diodes in series, and by controlling each output port of the microcomputer to correspond to the backlight or night light mode of the microwave oven, the brightness of the light emitting diode is modified according to the output signal of each output port to control the night light There is an effect of simplifying the implementation, and also from this it is possible to reduce the production cost of the microwave.

While the invention has been shown and described with respect to specific preferred embodiments thereof, the invention is not limited to the embodiments described above, and is typically used in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge of the world can make many variations.

Claims (4)

delete In the control device for controlling night light of a microwave oven, Controlling the system operation according to the cooking mode of the microwave, in response to the user's selection key signal, the first control signal for controlling the backlight on the microwave and the second control signal for controlling the night light on the microwave Creating a microcomputer; And Including a light emitting diode (LED), the first resistor (R1) and the second resistor (R2) connected in parallel with each other with different resistance values are connected in series with the light emitting diode (LED), the first resistor (R1) ) Is connected to the first output port P1 to respond to the first control signal of the microcomputer, and the second resistor R2 is connected to the second output port P2 to respond to the second control signal of the microcomputer. And a light emitting unit which responds to the first control signal and the second control signal and emits a corresponding brightness. The night light control device of the microwave oven according to claim 2, wherein at least two light emitting parts are formed, and an output port of the microcomputer is allocated to correspond to the at least two light emitting parts. The night light control device of the microwave oven according to claim 2, wherein the light emitting diode (LED) applied to the light emitting unit is a high brightness light emitting diode.

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