KR20000009830A - Self-examining method of overheating state for microwave oven - Google Patents

Abstract

PURPOSE: A self-examining method of the overheating state for a microwave oven is provided to judge the overheating state by directly detecting the cooking temperature of a cooking chamber and to indicate the state. CONSTITUTION: The self-examining method of the overheating state for a microwave oven includes the steps of:inputting the cooking starting command after setting up the cooking temperature and the cooking time; driving the magnetron in a state of inputting the cooking starting command; detecting the cooking temperature of a cooking chamber and comparing if the cooking temperature of the cooking chamber is higher than the previously set-up overheating reference temperature; and stopping the magnetron and indicating the error if judged the cooking temperature is higher than the overheating reference temperature.

Description

Self-diagnosis method of overheated state of microwave oven

The present invention relates to a self-diagnostic method for overheating a microwave oven, and more particularly, to directly detect a cooking temperature of a cooking chamber to determine whether an abnormality is in the overheating state, and to display such a state. It is about a diagnosis method.

In general, a microwave oven is a device that heats / cooks food using microwaves, and includes a conventional high voltage transformer and a magnetron. This high voltage transformer generates a predetermined high voltage to drive the magnetron, which emits microwaves of high frequency (approximately 2450 MHz) in a confined space where food is stored. The microwave thus vibrates the water molecules contained in the food, and the food is heated / cooked by molecular frictional heat generated by the vibration of the water molecules.

1 is a partially cutaway perspective view illustrating a conventional microwave oven, and FIG. 2 is a control block diagram of FIG. 1.

According to Figure 1, the cabinet 20 forming the appearance of the microwave oven is divided into a left and right space is provided with a cooking chamber 22, the front is open on one side, the lamp 26, the fan motor 27, the magnetron (on the other side) The apparatus room 23 in which various electric appliances, such as MGT), a high voltage transformer (HVT), and a high voltage capacitor (HVC), is installed is provided. An operation panel 25 is provided on the front surface of the apparatus room 23 for operating the microwave oven and displaying the state thereof.

In addition, the door 21 that opens and closes the front of the cooking chamber 22 is rotatably fixed to one side of the cabinet 20, and the rotating dish 24 in which food to be cooked is placed in the bottom surface of the cooking chamber 22. Is installed. The rotary plate 24 is rotated by a drive motor and gears not shown on the bottom surface of the cabinet 20 during food cooking to increase cooking efficiency.

According to FIG. 2, an input unit 10 for receiving various operation commands of a user, a cooking temperature detection unit 11 for detecting a temperature inside a cooking chamber, and input signals of the input unit 10 and cooking temperature detection unit 11 are provided. Accordingly, the microcomputer 12 for controlling the operating state of the load driver 13 to be described later is provided.

In addition, the load driver 13 controls microwave loads such as the lamp 2, the fan motor 3, the magnetron MgT, and the driving motor (not shown) described above with reference to FIG. 1 under the control of the microcomputer 12. Run or stop. The display unit 14 displays various operations and operation states of the microwave oven under the control of the microcomputer 12. The display unit 14 and the input unit 10 are preferably installed in the control panel 25 described above with reference to FIG.

In addition, the cabinet temperature sensor 15 for detecting the temperature of the cabinet 20 and applying it to the microcomputer 12 in order to prevent overheating of the microwave oven is provided separately.

3 is a flowchart illustrating a cooking method of a conventional microwave oven, and the operation of the conventional microwave oven configured as described above is as follows.

First, the user opens the door 21 and places the food to be cooked in the state in which the cooking chamber 22 is opened on the upper side of the rotating dish 24 inside the cooking chamber 22 through the front of the cabinet 20. Close 21. Thereafter, the user sets a cooking temperature and a cooking time according to the type of food through the input unit 10 of the operation panel 25, and inputs a cooking start command (S101 to S102).

The microcomputer 12 detects such a stop start command and operates the load driver 13 accordingly to load microwave loads such as a lamp 26, a fan motor 27, a magnetron (MGT) and a driving motor (not shown). Drive it. Therefore, the microwaves generated by the magnetron MTG are emitted into the cooking chamber 22, whereby the food is heated inside (S103).

As described above, the microcomputer 12 detects the temperature of the cabinet 20 through a separate cabinet temperature sensor 15, and compares whether the temperature of the cabinet 20 is equal to or higher than the superheated reference temperature. S104 to S105).

Therefore, when it is determined that the temperature of the cabinet 20 is equal to or higher than the preset overheating reference temperature, the microcomputer 12 controls the load driver 13 to stop the magnetron MTG to prevent overheating ( S106).

On the other hand, when it is determined that the temperature of the cabinet 20 is not higher than the preset overheating reference temperature, the microcomputer 12 detects the temperature inside the cooking chamber 22 through the cooking temperature detector 11 and detects the cooking temperature currently detected. It is determined whether or not the cooking temperature is higher than a preset cooking temperature by the user (S107 to S108).

Here, when it is determined that the cooking temperature currently detected is not higher than the preset cooking temperature, the microcomputer 12 repeatedly performs the magnetron driving, cabinet temperature detection, and cooking temperature detection steps (S103 to S107), while cooking currently detected. If it is determined that the temperature is above the preset cooking temperature, the cooking time is counted (S109). In addition, the display unit 14 displays the cooking time counted in this way.

Subsequently, when a predetermined cooking time set by the user is completed, the microcomputer 12 stops the driving of the magnetron MTG and various loads through the load driving unit 13 to end all cooking operations of the microwave oven ( S110 to S111).

However, such a conventional microwave oven is provided with a separate cabinet temperature sensor for detecting an overheating state, thereby increasing production cost, and indirectly detecting overheating of the cooking chamber through the temperature of the cabinet detected by the temperature sensor. Therefore, there was a problem that the user can not immediately determine the state of such overheating.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, by directly detecting the cooking temperature of the cooking chamber to determine whether there is an abnormality of the overheating state, and to display the state of the microwave oven It is to provide a self-diagnosis method for overheating.

1 is a partially cutaway perspective view showing a conventional microwave oven,

2 is a control block diagram of FIG. 1;

3 is a flowchart illustrating a cooking method of a conventional microwave oven,

Figure 4 is a flow chart showing a preferred embodiment of the overheated self-diagnosis method of the microwave oven according to the present invention.

Explanation of symbols on the main parts of the drawings

10: input unit 11: cooking temperature detection unit

12: microcomputer 13: load driving unit

14: display unit 22: cooking chamber

The self-diagnosis method of the overheat state of the microwave oven according to the present invention for achieving the above object is a data input step of inputting a start command after setting a cooking temperature and a cooking time, and in a state where a start command is input. The cooking temperature of the cooking chamber is overheated by a load driving step of driving the magnetron, a cooking temperature inside the cooking chamber, and comparing the cooking temperature with a preset overheating reference temperature. If it is determined that the temperature is abnormal, the driving stop and error display step of stopping the magnetron and displaying an error are included.

In addition, if it is determined by the temperature comparison step that the cooking temperature of the cooking chamber is not higher than the overheating reference temperature, it is preferable to further include a normal driving step for performing normal cooking.

Therefore, the cooking temperature of the cooking chamber is directly detected, and the load is stopped by judging whether there is an abnormality of the overheating state by itself, and such a state is immediately displayed, so that the user can recognize the abnormality of the overheating state of the microwave oven and respond appropriately. To be able.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the overheat state self-diagnosis method of the microwave oven according to the present invention, the same components as in the prior art will be described by applying the same reference numerals.

Figure 4 is a flow chart showing a preferred embodiment of the overheated self-diagnosis method of the microwave oven according to the present invention, the operation of the preferred embodiment according to the present invention in more detail as follows.

In order to prevent overheating of the microwave oven, the main feature of the present invention is to detect the temperature of the cabinet 20 from the cooking temperature detection unit 11 without using the cabinet temperature sensor 15 for applying it to the microcomputer 12. By using the cooking temperature detected to prevent overheating of the microwave oven.

The user sets a cooking temperature and a cooking time through the input unit 10 and then performs a data input step of inputting a cooking start command, and the data is input to the microcomputer 12 (S201 to S202).

As described above, the microcomputer 12 controls the load driving unit 13 while the diaphragm start command is input. Thus, a microwave load such as a lamp 26, a fan motor 27, a magnetron (MGT), and a driving motor (not shown) may be used. Perform a load driving step of driving the. Therefore, the microwaves generated from the magnetron MTG are discharged into the cooking chamber 22 to heat the food therein (S203).

Thereafter, the microcomputer 12 detects a current cooking temperature in the cooking chamber 22 through the cooking temperature detector 11 and performs a temperature comparison step of comparing whether the cooking temperature is higher than or equal to a preset overheating reference temperature (S204). S205).

Therefore, when it is determined by the temperature comparing step that the cooking temperature of the cooking chamber 22 is equal to or higher than the overheating reference temperature, the microcomputer 12 controls the load driving unit 13 to stop the magnetron MTG and displays the display unit ( 14) the overheating of the microwave oven is prevented by performing a driving stop for displaying an error and an error display step (S206 to S207).

On the other hand, if the microcomputer 12 determines that the cooking temperature of the cooking chamber 22 is not higher than the overheating reference temperature by the temperature comparing step, the microcomputer 12 performs the normal driving step of performing normal cooking (S208 to S211). In addition, the process of the normal cooking is similar to the conventional cooking method (S108 ~ S111) described with reference to Figure 3, the detailed description thereof will be omitted here.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to fall within the scope of the claims set forth.

As described above, according to the self-diagnosis method of the overheated state of the microwave oven according to the present invention, the cooking temperature of a certain time is detected and the load is stopped by judging whether the overheated state is abnormal. Since the display, the user can quickly recognize whether there is an abnormal state of the overheating state of the microwave oven, and has the effect of appropriately handling.

Claims (2)

A data input step of inputting a cooking start command after setting a cooking temperature and a cooking time; A load driving step of driving the magnetron in a state in which a stop start command is input; A temperature comparison step of detecting a cooking temperature inside the cooking chamber and comparing whether the cooking temperature is equal to or greater than a preset superheat reference temperature; And If it is determined by the temperature comparison step that the cooking temperature of the cooking chamber is greater than the overheating reference temperature, the self-diagnosis of the overheat state of the microwave oven, characterized in that it comprises a stop operation and error display step to stop the magnetron and display an error. Way. The overheat state of the microwave oven according to claim 1, further comprising a normal driving step of performing normal cooking when it is determined by the temperature comparing step that the cooking temperature of the cooking chamber is not higher than an overheating reference temperature. Diagnostic method.