KR20050083504A - Control method of high voltage trans of micro wave oven - Google Patents

Abstract

The present invention relates to a high voltage transformer control method of a microwave oven.

The present invention is a setting step of measuring the ambient temperature of the high-voltage transformer disposed in the electrical equipment room and setting to a set temperature; A cooking execution step of executing automatic cooking after completing the setting step; Determining whether the detected temperature is higher or lower than the initially set predetermined temperature after sensing the ambient temperature of the high-voltage transformer after completing the execution step; A cooling step of cooling the high voltage transformer when the detected temperature is greater than a predetermined temperature after completing the determination step; An operation progress step of operating the high voltage transformer at full power or at an appropriate power of 50% to 90% after the cooling step is completed; And stopping the driving of the high voltage transformer when the set time has elapsed after the operation progressing step is completed.

Therefore, when the ambient temperature of the high voltage transformer mounted in the electronics room of the microwave oven is sensed and rises above a certain temperature, the software program can be used to adjust the initial cooling time and the power level of the high voltage transformer appropriately, thereby increasing the size and weight of the high voltage transformer. Reduces and prevents overheating.

Description

Control method of high voltage trans of micro wave oven

The present invention relates to a method for controlling a high voltage transformer of a microwave oven, and more particularly, when the ambient temperature of the high voltage transformer mounted in the microwave's electric room is sensed and rises above a certain temperature, an initial cooling time and a high pressure are used. The present invention relates to a method for controlling a high voltage transformer of a microwave oven by adjusting the power level of the transformer appropriately, thereby reducing the size and weight of the high voltage transformer and preventing overheating.

As is generally known, a microwave oven generates microwaves by applying a high voltage to the magnetron, and uses the microwaves to cook food by causing molecular collisions with moisture contained in the food.

1 to 2 show an exploded perspective view and a circuit diagram showing the main components of a typical microwave oven.

As shown in the drawing, a general microwave oven is provided to open and close a heating chamber 110 accommodated by a door 120 to cook a heating object by supplying microwaves, and to generate microwaves on one side thereof. The electrical equipment room 100 is configured to be partitioned and covered by the outer casing 200.

The high voltage transformer 10 generates a high voltage of about AC 2,000V and a voltage of about AC 3.4V by receiving a commercial power source, and a high voltage diode rectifying and boosting the high voltage of AC 2,000V. And a magnetron 40 for generating microwaves by receiving a high voltage DC voltage through the high voltage diode and the high voltage capacitor 30 while being heated by receiving a voltage of 3.4 V AC and the high voltage capacitor 30. It is placed in this element.

And a blower fan 60 for cooling the heat generated by the driving of the circuit components is disposed on one side wall of the electric compartment (see Fig. 1).

Therefore, when the high voltage transformer 10 makes a "+" half wave, a voltage of 2,000 V is charged to the high voltage capacitor 30 through the high voltage capacitor 30 and the high voltage diode. 4KV is applied to the magnetron 40 in addition to the charged voltage.

As described above, when a current flows into the high voltage transformer 10, heat is generated by the current, and heat generated by such a factor is cooled by the operation of the blower fan 60, which is omitted from the drawing representation.

However, the following problems occurred in the structure of the high voltage transformer 10 as described above.

That is, when the microwave oven is operated in the automatic mode to cook food in the microwave, the power level is 100% when the operating condition of the automatic mode continues for a set time or the power level is 50% when a certain time elapses. Software algorithms have been configured to drop to ~ 90%.

However, when operating in the automatic mode in the microwave as described above, as the power level continues to operate at an efficiency of 100%, the coil temperature of the high voltage transformer 10 is excessively increased to shorten the life of the high voltage transformer 10. There was a problem.

Of course, in order to solve this problem, as described above, when a certain time has passed after the operation of the microwave oven, the software algorithm is configured so that the power level of the high voltage transformer 10 is only about 50% to 90%. In the case of continuous cooking, the power level was reduced by about 50% to 90% in the middle of the continuous cooking, and thus satisfactory cooking results were not obtained, which lowered the reliability of the microwave oven.

In addition, in order to use the microwave for a long time, the core of the high voltage transformer 10 should be stacked a lot so as to emit a lot of heat generated from the high voltage transformer 10, and the wire diameter of the coil should be used. The high pressure transformer 10 had a problem that the material cost is increased and the weight becomes heavy.

In addition, according to the capacity of the high voltage transformer 10, the high voltage diode and the high voltage capacitor used in the driving circuit of the high voltage transformer 10 also have a problem that the overall manufacturing cost increases due to the increase in the capacity.

Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention to solve the structural problems of the high-voltage transformer of the microwave oven, by detecting the ambient temperature of the high-voltage transformer mounted in the electrical equipment room of the microwave oven When the temperature rises above a certain temperature, a software program is used to adjust the initial cooling time and the power level of the high voltage transformer appropriately, thereby reducing the size and weight of the high voltage transformer and providing a high voltage transformer control method for preventing overheating. .

The present invention for achieving the above object, the setting step of measuring the ambient temperature of the high-voltage transformer disposed in the electrical equipment room and setting to a set temperature; A cooking execution step of executing automatic cooking after completing the setting step; Determining whether the detected temperature is higher or lower than the initially set predetermined temperature after sensing the ambient temperature of the high-voltage transformer after completing the execution step; A cooling step of cooling the high voltage transformer when the detected temperature is greater than a predetermined temperature after completing the determination step; An operation progress step of operating the high voltage transformer at full power or at an appropriate power of 50% to 90% after the cooling step is completed; And stopping the driving of the high voltage transformer when the set time has elapsed after the operation progressing step is completed, and providing a high voltage transformer control method of the microwave oven provided as a completion step of completing cooking.

Preferably, the cooking execution step is preferably at least one of automatic cooking once or automatic cooking continuous.

Also preferably, the determining step may be performed when the sensed temperature is less than or equal to the prescribed temperature.

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

1 is an exploded perspective view showing a configuration of a general microwave oven to which the present invention is applied, and FIG. 2 is a flowchart illustrating an operation of the high voltage transformer according to the present invention.

For convenience of explanation, the same parts and members are assigned the same parts and numbers as in the prior art.

In other words, the driving principle and operation of the high-voltage transformer applied in the present invention is the same as described above in the prior art in order to explain the driving operation and principle of a general microwave oven, so a separate redundant description thereof will be omitted and features of the present invention. Only the parts will be explained step by step.

Setting step

After measuring the ambient temperature of the high-voltage transformer 10 arranged in the electric room, set the set temperature.

At this time, the set temperature is, for example, the high-voltage transformer 10 is operated for a long time, the efficiency thereof is reduced or the high-voltage transformer 10 is overheated to a high temperature after checking the temperature to the extent that the high-voltage transformer 10 is damaged by overheating Set the temperature beforehand beforehand.

Of course, such a setting temperature will be the temperature of the result obtained through the long-term repetitive test operation of the microwave oven, and in order to satisfy this, a temperature detecting sensor capable of detecting the temperature should be installed around the high voltage transformer 10. The temperature sensor will have to be electrically connected to the microcomputer provided in the microwave oven.

Cooking run step

After the setting temperature is set as described above, the microwave is operated to perform cooking.

Of course, the cooking time may be a variety of cooking conditions depending on the type of food and the cooking method, but for example, it must be a condition that can operate the microwave continuously for more than a few ten minutes.

Judgment stage

After setting the temperature set as described above, if the microwave oven, that is, the high voltage transformer 10 is continuously operated, the temperature sensor is to check the temperature of the high voltage transformer 10 continuously.

As described above, if the set temperature is lower than or equal to the prescribed temperature while the temperature sensor continuously checks the temperature of the high pressure transformer 10 in which cooking is performed, the high pressure transformer 10 is fully operated or the high pressure transformer 10 is activated. Efficiency, that is, as described above, the software algorithm controls the efficiency of the high-voltage transformer 10 to operate at an efficiency of about 50% to 90%.

Of course, the control operation of the high voltage transformer 10 as described above is possible to control in the microcomputer by a preset program.

Cooling stage

Meanwhile, if the ambient temperature of the high-voltage transformer 10 checked by the temperature sensor is higher than the predetermined temperature while the continuous cooking time is checked by continuing the above determination step, driving of the microwave oven, that is, high-voltage transformer 10 ) And stops the operation of the blower fan 60 disposed in the electrical equipment room 100 to cool the high pressure transformer.

Of course, the above operation also when the temperature sensor detects the ambient temperature of the high-voltage transformer 10, and transmits the sensed temperature signal to the microcomputer, the microcomputer receives the signal of the temperature sensor and then the drive of the high-voltage transformer 10 After stopping, the blower fan 60 is driven.

Action Progress Step

After completing the cooling step as described above, the high-pressure transformer 10 is operated at an appropriate power of 50% to 90% under the control of full power or microcomputer to proceed with cooking.

Of course, the operation of the microwave oven is also operated by the control of the microcomputer.

Completion step

After the above-described series of operations, when the set cooking time has elapsed, all the power supplied to the microwave is cut off and the completion of cooking of the food is notified. The cooking execution step as described above is limited to one-time automatic cooking. Applicable to automatic or continuous cooking.

Therefore, the high-voltage transformer is not damaged by overheating while the microwave is being cooked.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects.

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described in detail above, according to the present invention, when the ambient temperature of the high-voltage transformer mounted in the electrical equipment room of the microwave oven rises above a certain temperature, the initial cooling time and the power level of the high-voltage transformer are appropriately adjusted using a software program. By adjusting it, the size and weight of the high-voltage transformer are reduced and it is effective to prevent overheating.

1 is an exploded perspective view of a general microwave oven to which the present invention is applied.

2 is a process chart showing a control method of a high-voltage transformer according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: high voltage transformer 30: high voltage capacitor

40: magnetron 60: blowing fan

Claims (3)

A setting step of measuring the ambient temperature of the high-voltage transformer disposed in the electrical equipment room and setting it to a set temperature; A cooking execution step of executing automatic cooking after completing the setting step; Determining whether the detected temperature is higher or lower than the initially set predetermined temperature after sensing the ambient temperature of the high-voltage transformer after completing the execution step; A cooling step of cooling the high voltage transformer when the detected temperature is greater than a predetermined temperature after completing the determination step; An operation progress step of operating the high voltage transformer at full power or at an appropriate power of 50% to 90% after the cooling step is completed; And And a completion step of stopping cooking of the high voltage transformer and completing cooking when a set time elapses after the operation progressing step is completed. The method of claim 1, The cooking execution step is a high-voltage transformer control method of a microwave oven, characterized in that at least one of automatic cooking once or automatic cooking continuous. The method of claim 1, The determining step is a high-voltage transformer control method of the microwave oven, characterized in that proceeds to the operation progress step if the detected temperature is less than or equal to the prescribed temperature.