KR20000043275A - Method for controlling no-load state of microwave oven - Google Patents

Abstract

PURPOSE: A control method of no-load state of a microwave oven is provided to reduce electricity consumption of a microwave oven by indicating error and cutting off power when a cooking starting key is input without food. CONSTITUTION: A door of a microwave oven is closed after supplying power, detecting the weight of a component chamber, and putting a food to be cooked in the component chamber. The weight in the component chamber is detected when a cooking starting key is input by deciding the input of a cooking starting key by a user. The no-load weight is compared to the weight of the component chamber. If the no-load weight is lighter than the weight, a magnetron is operated to start cooking. An error is displayed when the no-load weight is accorded with the weight after deciding the completion of cooking. Finally, power is cut off.

Description

How to control no-load state of microwave oven

The present invention relates to a method of controlling a no-load state of a microwave oven. In particular, when a cooking start key is input without putting food to be cooked in an electric room, the controller detects this and displays an error and cuts off the power to reduce the power consumption of the microwave oven. The present invention relates to a method of controlling a no-load state of a microwave oven which can be minimized.

In general, microwave ovens vibrate water molecules contained in foods by applying high voltage electricity to the high frequency oscillator, the Marknetron, which causes the food to vibrate outside and inside by frictional heat. At the same time, it is an electric appliance that heats quickly, and nowadays, a microwave oven employing a heater is used to cook the grill, and the food can be heated by a heater with microwaves, so that various foods can be cooked. have.

Here, a typical microwave oven, as shown in Figure 1, the tray 52 is installed on the bottom surface of the rectangular space inside the microwave oven main body 50 to cook evenly, the body of the microwave oven ( 50) On one side, an operation panel 56 is provided which sets each cooking function and includes start and end keys.

And the door 54 of the microwave oven is provided with a viewing window 58 to look into the cooking state in the cooking chamber and the door lock safety device 60 for fixing the door 54 with the main body 50 is installed It is.

When the user wants to cook food using such a microwave oven, the food is first put into the cooking chamber and the cooking is selected through a corresponding key on the operation panel 56.

Then, the magnetron received high voltage through the high-voltage transformer emits a constant microwave through the waveguide, so the food in the cooking room is heated or cooked for a predetermined time.

In such a conventional microwave oven, when a cooking start key is input in a no-load state in which the food to be cooked is not loaded, the microwave is operated for a predetermined time, and the temperature in the electric cabinet within the predetermined time is a predetermined value. When it reaches, the thermostat equipped with bimetal which generates elastic force when the inside of the electric compartment reaches a predetermined value is operated. The elastic force of the bimetal cuts off the power supplied to the microwave oven.

As described above, the microwave oven operates for a predetermined time even in the no-load state of the conventional microwave oven, thereby causing a problem that the power consumption of the microwave oven increases.

Accordingly, the present invention has been made to secure such a problem, the object of the present invention is to determine that there is no food in the electrical equipment room of the microwave oven if there is no difference between the no-load weight and the weight of the electrical equipment room in the no-load state of the microwave oven The present invention provides a method of controlling a no-load state of a microwave oven which can reduce power consumption of the microwave oven by cutting off the power supplied from the microwave oven.

In order to achieve the above object, the present invention provides an initial stage for supplying power, a no-load weight detection step for detecting the weight of the electrical equipment room when the execution of the initial stage is completed, and cooking in the electrical equipment room when the execution of the no-load weight detection step is completed. The cooking preparation step of putting the food to be closed and closing the door, the first judging step of judging whether the cooking start key has been input by the user after the preparation for cooking is completed, and the current judgment when the cooking start key is determined in the first judging step. When the weight detection step of detecting the weight in the battle room, the first comparison step of comparing the weight of the no-load weight and the weight output step of the no-load weight detection step, and the no-load weight in the first comparison step is determined to be less than the weight A cooking start step of starting the cooking of food by operating the magnetron, a second judging step of determining whether cooking is completed, and the first When it is determined that the no-load weight and weight matched at the T stage is characterized in that when the error display step of displaying an error of the microwave oven, and an error display step has finished running, made of a power saving method comprising: the power is turned off.

1 is an external configuration diagram of a typical microwave oven.

Figure 2 is a block diagram showing the configuration of a microwave oven to which the present invention is applied.

3 is a flowchart illustrating a process of controlling a no-load state of a microwave oven according to the present invention.

<Explanation of symbols for main parts of drawing>

11, 12: 1st and 2nd safety switch 13: Key input part

14: start switch 15: control unit

16: tray motor 17: fan motor

18: output control relay switch 19: high voltage transformer

20: high pressure rectifier 21: magnetron

22: magnetron temperature switch 23: heater relay switch

24: heater 25: display unit

The present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the apparatus of the microwave oven to which the present invention is applied includes a primary safety switch 11 and a secondary safety switch 12 that operate in a state in which the door is turned on by closing the main body, and the microwave oven. According to the connection of the key input unit 13 including the function selection signal of the operation panel and the power saving key and the start switch 14 of the key input unit 13, the operating power input through the low voltage transformer (not shown) Control unit 15 for controlling the operation of the stove, GM (Geared Moter: hereinafter tray motor) is supplied to the operating power is supplied in accordance with the control signal of the control unit 15 in the on state of the start button 14 to rotate at a constant speed 16 and a fan motor 17 which is blown to reduce the internal temperature and the electrical room temperature by receiving an operating power supply and a control signal from the control unit 15 when the start switch 11 is turned on. When the start switch 14 is connected to the on state, An output control relay switch 18 connected according to a control signal of the fisherman 15 to output operating power, a high voltage transformer 19 for generating a high pressure by an on state of the output control relay switch 18, and a high pressure The control unit according to the high-frequency rectifying unit 20 for rectifying the high pressure generated by the transformer 19, the magnetron 21 oscillating high frequency in response to the output voltage of the high-voltage rectifying unit 20, and the high-frequency oscillating state of the magnetron 21. The magnetron temperature switch 22, which is sequentially connected by the control signal generated in 15) and stops oscillation of high frequency, is connected according to the control signal of the controller 15 when the start switch 14 is connected, Display for displaying the heater 24 and the heater 24 to generate heat according to the connection of the heater relay switch 23 and the heater relay switch 23 to generate heat, and the mode and time for operating the microwave oven. It consists of a play part 25.

Here, the key input unit 13 includes a plurality of buttons for executing general functions of the microwave, for example, thawing, oven, and the like, and power saving keys for power saving of the microwave. In addition, the key input unit 13 and the display unit 25 are integrally formed, and the display unit 25 is provided to display cooking time, cooking state, and the like.

On the other hand, look at the operation of the present invention made of the configuration as follows. First, the door is opened in a microwave oven to which the operating power 220V is applied, and food for warming or cooking is placed on a tray installed at the bottom of the battlefield, and the door of the microwave oven is closed. Then, the primary safety switch 11 and the secondary safety switch 12 are turned on and it is detected that the door is closed by a door detection switch (not shown), and the detected signal is applied to the controller 15. At this time, if a cooking function suitable for food is selected as a key operation through the key input unit 13 of the operation panel of the microwave oven, a predetermined signal output by the key operation is input to the controller 15.

Then, the start switch 14 is operated in contact with the control signal of the control unit 15. At this time, the operating power of the start switch 14 is the first safety switch 11 and the second safety switch 12. It is supplied to the control unit 15 through.

Therefore, the operating power is applied to the tray motor 16 and the fan motor 17 so that the tray on which the food is placed rotates. In addition, the operating power is supplied to the high voltage transformer 19 by the contact operation of the output control relay switch 19, the high voltage transformer 19 generates a high pressure, and the high pressure is supplied to the high voltage rectifying unit 20.

The high-voltage rectifier 20 rectifies a high voltage, the rectified high voltage is supplied to the magnetron 21, and the magnetron oscillates high frequency.

The heater relay switch 23 is connected according to the control signal of the control unit 15, thereby operating power is output, the operating power is supplied to the heater 24, the heater 24 generates heat. This heat and high frequency heat or cook food in the microwave.

In addition, when the high frequency oscillated by the magnetron 21 is supplied to the control unit 15, and the control unit 15 determines whether a predetermined time has elapsed after the high frequency oscillation of the magnetron 21 is determined to be within a predetermined time, the control signal And a control signal are supplied to the magnetron temperature switch 22 to sequentially connect the magnetron temperature switch 22.

When the power saving key of the key input unit 13 is selected after the above cooking operation is completed, the controller 15 recognizes this and cuts off the operation power supplied to the display unit 25. Therefore, the display portion 25 is turned off.

3 is a detailed flowchart illustrating a power saving method of the microwave oven according to the present invention.

When the execution of the initial stage S1 of supplying power is completed, the process proceeds to the no-load weight detection step S2 for detecting the weight in the battlefield, and the no-load weight detection step S2 detects the weight in the no-load state in the battlefield. After outputting the no-load weight (A), and the detection of the weight of the no-load state is completed, the food preparation in the battlefield is put into the cooking preparation step (S3) to close the door.

In the cooking preparation step S3, the first safety switch and the second safety switch are connected by closing the door. When the cooking preparation is completed, the first judging step determines whether the cooking start key is input by the user. Proceed to (S4).

Here, when it is determined that the cooking start key is input, the process proceeds to the weight detection step S5 for detecting the weight B in the current battlefield, and when the detection of the current weight B in the battlefield is completed, the no-load weight detection step. It proceeds to the first comparison step (S5) comparing the no-load weight (A) of (S2) and the weight (B) output in the weight detection step (S4).

When it is determined in the first comparison step (S5) that the no-load weight (A) is less than the weight (B), proceeds to the cooking start step (S6) to start the cooking of food by operating the magnetron, the cooking start step (S6) Supplies a high voltage to the magnetron, thereby oscillating a constant high frequency from the magnetron, and feeds the oscillated high frequency to food in the battlefield to cook food.

Thereafter, the process proceeds to the second judging step S7 of determining whether cooking is completed, and if it is determined that cooking is completed, the loop is terminated.

On the other hand, when it is determined in the first comparison step (S5) that the no-load weight (A) and the weight (B) is the same, the display proceeds to an error display step (S8) for displaying the error of the microwave, and when the display of the error is completed In step S9, the power supply to the microwave is cut off.

In addition, when it is determined that the cooking start selection key is not input in the first determination step (S3), the process proceeds to another mode execution step (S10) of executing a mode corresponding to the selected key. End the loop.

According to the present invention, when there is no food to be cooked in the battlefield, when a cooking start key is input, the controller recognizes this and displays an error state and turns off the power, thereby reducing the power consumed in the unloaded state of the battlefield to a minimum. There is.

Claims (1)

In the microwave cooking food according to the high frequency generated in the magnetron, the initial stage of supplying power, A no-load weight detection step of detecting the weight in the battle room when the execution of the initial stage is completed A cooking preparation step of putting food to be cooked in the battlefield and closing the door when the execution of the no-load weight detection step is completed; A first judging step of determining whether a cooking start key has been input by the user after the preparation for cooking is completed; A weight detection step of detecting a weight in a current battlefield when it is determined that a cooking start key is input in the first determination step; A first comparison step of comparing the no-load weight of the no-load weight detection step and the weight output in the weight detection step, A cooking start step of starting cooking of the food by operating the magnetron when it is determined that the no-load weight is smaller than the weight in the first comparison step; A second judging step of judging whether cooking has been completed; An error display step of displaying an error of the microwave oven when it is determined that the no-load weight and the weight match in the first comparison step; And a power saving step of shutting off power when the execution of the error display step is completed.