KR19990058217A - Relay switch fusion notification method of microwave oven - Google Patents

Abstract

The present invention relates to a relay switch fusion notification method of a microwave oven. In the related art, a notification unit is formed when a driving relay is fused, but this does not help anymore, and the fusion of the driving relay is detected in hardware or software. There was a problem in that it was impossible to select the power of electromagnetic waves and kept the "on" state.

Accordingly, the present invention sets the change value (ΔV) of the value input from the low voltage transformer to the analog / digital port (A / D) as the load changes to the microcomputer (step 100), and cooking is in progress. In step 110, the voltage V1 input to the analog / digital port A / D is sensed (step 120), and when cooking is finished (step 130), analog / digital The voltage value V2 input to the port A / D is sensed (step 140), and it is determined how the difference between V2 and V1 becomes ΔV (step 150), and the difference between the V2 and V1 is ΔV If abnormal, it is determined that the operation is normal (step 160), and if it is small, it informs the display unit that the relay switch has been fused (step 170), and the alarm unit operates the alarm sound (step 180) to fusion the relay switch with the display unit. By telling the cooker to prevent the malfunction occurs Is a very useful invention.

Description

Relay switch fusion notification method of microwave oven

The present invention relates to a relay switch fusion notification method of a microwave oven, and more particularly, a relay switch fusion notification of a microwave oven that prevents a malfunction from occurring by informing the cooker of the relay switch through the display unit and the horn. It is about a method.

In general, the microwave oven is configured to heat food by placing food on a tray in a cooking chamber and irradiating the inside of the cooking chamber with a high frequency generated from a magnetron. Among these microwave ovens, a stove for heating and cooking food only by a high frequency as a main heating source is called a microwave with a simple function, and a stove having a grill and oven function by a heater and a convection fan, which may be referred to as an auxiliary heating source in addition to the high frequency. It is called a multifunctional microwave oven.

The above-mentioned single-function microwave oven and multi-function microwave oven are divided into a cooking chamber and an electric equipment room. In the electric equipment room, a magnetron and a waveguide are installed to emit microwaves by applying a high voltage by a high voltage transformer generating a high voltage and a high voltage transformer. Also, since the high pressure transformer and the magnetron are operated to generate high heat, a cooling fan and a duct for inducing the wind of the cooling fan to the inside of the cooking chamber are installed to prevent them from overheating.

In addition, a tray rotated by a tray motor is installed in the lower part of the cooking chamber in order to disperse high frequency radiated to the cooking chamber through the waveguide to effectively cook food. The reason for rotating the tray is that the high frequency irradiated into the cooking chamber through the waveguide is always constant. In order to prevent the heating of only one portion of the food to be concentrated only in the direction to rotate the tray so that the high frequency is evenly irradiated on the food placed on the tray.

In addition, in the multi-functional microwave oven, a heater is installed so that the food that needs to be cooked for a long time such as meat in the upper part of the cooking chamber can be browned to the inside and the outside when cooking. Although it is used as a heating source, the heater installed only at the upper part of the cooking chamber browns only the upper part of the meat, and the bottom part of the meat cannot be browned.

Therefore, in consideration of this, a separate heater is installed on the bottom of the cooking chamber bottom plate, and then the microwave oven is configured to effectively dissipate the lower part of the meat by dissipating the heat of the heater through a plurality of heat radiating holes drilled in the cooking chamber bottom plate. In some cases, microwave ovens have been developed and coated with ceramics or the like using a heating plate to emit far infrared rays from the heater.

1 is a view showing a heater control circuit of a microwave oven according to the prior art.

The conventional microwave heater control circuit includes a key input unit 12, a display unit 14, and a heater moving unit 16 around the microcomputer 10.

The heater moving part 16 includes a switching element TR1, a driving relay RY1, and a heater H.

Therefore, the cook selects the grill dish through the key input unit 12, converts the signal into a signal that can be recognized by the display unit 14 through a predetermined signal processing procedure according to the signal, and simultaneously outputs the heater moving unit ( When the high signal is output through the output port P1 of the 16, the switching element TR1 is turned on while applying an external power supply (+ V _DD ) to contact the driving relay RY1 and the heater H. )).

In addition, the notification unit 20 is connected through one output port P2 of the microcomputer 10, which forms a horn 22 with the switching element TR2, and the switching element TR2. The output port (P2) is connected to the base terminal of the horn 22 is connected to the collector terminal.

Accordingly, when a signal is input through the key input unit 12, a "high" signal is output through the output port P2 according to the signal to turn on the switching element TR2 to turn the horn 22 on. This will work.

According to the above-described conventional technology, a notification part is formed when the driving relay is fused, but this does not help anymore, and it is impossible to detect the fusion of the driving relay in hardware or software, so that the selection of the power of electromagnetic waves is possible. There was a problem that this was impossible and must remain "on" as it is.

Accordingly, an object of the present invention is to solve the above problems, to provide a relay switch fusion notification method of the microwave oven to prevent the malfunction caused by the relay switch is fused to inform the cook through the display unit and the horn. There is.

Such an object of the present invention includes an initial change value setting step of setting a value in which the voltage value inputted from the low voltage transformer to the analog / digital port for the first time changes to the microcomputer as loads such as a fan or a tray and a lamp change; A cooking progress voltage value sensing step of sensing a voltage value input from the low voltage transformer to the analog / digital port while cooking is performed from the initial change value setting step; A post-cooking voltage value sensing step of sensing a voltage value input from the low voltage transformer to the analog / digital port after cooking is finished from the cooking in progress voltage value sensing step; And when the difference between the voltage value detected in the voltage value sensing step after the end of cooking and the voltage value detected in the voltage value during the cooking in progress step is determined to be less than the value detected in the initial change value setting step to determine to the cooker This is achieved by performing a notification.

1 is a diagram illustrating a circuit for controlling a relay switch and a notification unit of a microwave oven according to the related art;

2 is a view for explaining a control circuit of a microwave oven according to the present invention;

Figure 3 is a step-by-step block diagram of the relay switch fusion notification method of the microwave oven according to the present invention;

Figure 4 is a flow chart for performing a relay switch fusion notification method of the microwave oven according to the present invention.

Explanation of symbols for main parts of the drawings

100: micom 101: key input unit

102: display unit 104: heater moving unit

105: notification unit 106: load moving unit

L.V.T: Low Voltage Transformer

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which the technical constitution and operational effects as an exemplary embodiment can effectively achieve the object of the present invention.

FIG. 2 is a view for explaining a control circuit of a microwave oven that performs the present invention, and description thereof will be omitted for the same parts as in FIG. 1.

The present invention forms a microcomputer 100, a key input unit 101, a display 102, the heater moving unit 104 and the notification unit 105 in the output ports (P1, P2, P3) of the microcomputer 100, respectively. And a load operation unit 106, and is applied to a control circuit which forms a low voltage transformer LVT with an analog / digital input port A / D.

That is, when a cook selects a cooking selection signal and a cooking start signal through the key input unit 101, the microcomputer outputs a control signal to the output ports P1, P2, and P3 through a predetermined data processing procedure. ) And the load operation unit 106.

The load operation unit 106 constitutes a circuit for driving a load F such as a magnetron, a fan, and a tray lamp, and includes a switching element TR3 and a driving relay RY3.

In the above, when the heater moving unit 104 and the load moving unit 106 is operated, the value of V ₁ of the low voltage transformer LVT is changed, and if V ₁ is changed, the value of V ₂ is also changed.

Thus, the present embodiment could be achieved by programming using this phenomenon.

Figure 3 is a step-by-step block diagram of the relay switch fusion notification method of the microwave oven according to the present invention.

The present invention provides an initial change value setting step (200) of setting a value in which the voltage value input to the analog / digital port from the low voltage transformer to the microcomputer for the first time as loads such as a fan or a tray and a lamp change; A cooking in progress voltage value sensing step 300 for sensing a voltage value input from the low voltage transformer to the analog / digital port while cooking is performed from the initial change value setting step 200; A post-cooking voltage value sensing step 400 of detecting a voltage value input from the low voltage transformer to the analog / digital port after cooking is finished from the cooking progress voltage value sensing step 300; In addition, the difference between the voltage value detected in the voltage value detected step 400 after the completion of cooking and the voltage value detected in the voltage value sensing step 300 in progress may be smaller than the value detected in the initial change value setting step 200. In this case, to determine the abnormality is to perform a process consisting of a notification step 500 to inform the cook.

Figure 4 is a flow chart for performing the relay switch fusion notification method of the microwave oven according to the present invention, the step of Figure 3 will be described again step by step.

First, as the load changes to the microcomputer, the change value (ΔV) of the value applied from the low voltage transformer to the analog / digital port (A / D) is set (step 100), and cooking is in progress (step 110). In the example), the voltage value V1 input to the analog / digital port A / D is sensed (step 120).

When cooking is finished (YES in step 130), the voltage value V2 input to the analog / digital port A / D is sensed (step 140), and how the difference between V2 and V1 differs from? V. It is judged whether or not (step 150).

If the difference between V2 and V1 is ΔV or more, it is determined that the operation is normal (step 160). If the difference is small, it is notified that the relay switch is fused to the display unit (step 170), and a warning sound is activated (step 180).

As described above, the relay switch fusion notification method of the microwave oven according to the present invention is a very useful invention that can prevent the malfunction from occurring by informing the cooker of the relay switch through the display unit and the horn.

Claims (1)

An initial change value setting step 200 of setting a value in which the voltage value inputted from the low voltage transformer to the analog / digital port for the first time changes to the microcomputer as loads such as a fan or a tray and a lamp change; A cooking in progress voltage value sensing step 300 for sensing a voltage value input from the low voltage transformer to the analog / digital port while cooking is performed from the initial change value setting step 200; A post-cooking voltage value sensing step 400 of detecting a voltage value input from the low voltage transformer to the analog / digital port after cooking is finished from the cooking progress voltage value sensing step 300; In addition, the difference between the voltage value detected in the voltage value detected step 400 after the completion of cooking and the voltage value detected in the voltage value sensing step 300 in progress may be smaller than the value detected in the initial change value setting step 200. In the case of determining the abnormality of the relay switch fusion notification method of the microwave oven comprising a notification step 500 to inform the cooker.