KR100267488B1 - A complex microwave oven of heater control process - Google Patents

Abstract

PURPOSE: A controlling method for a heater in a composite microwave oven is provided to detect wrong operation in swing operation of the heater for alarming to a user. CONSTITUTION: Micro switches are installed in a microwave oven for being turned on and off according to rotation of a synchronizing motor. A motor is rotated by counting a time from a received point of signals from the switches in a control unit. An abnormal state of the motor is decided by not receiving the signals from the switches over an established time. By receiving the signal from the first micro switch, reverse rotation of the motor caused by a contact of a container and the heater is decided for generating an alarming sound. By detecting the signal from the second micro switch, the heater at an initial location is decided for stopping the motor. In case of detecting signals from the switches after the established time, normal operation of the heater is decided.

Description

Heater control method of composite microwave oven

The present invention relates to a method for controlling a heater of a composite microwave oven, and more particularly, to detect a case where an abnormal motor, a non-rotational heater, and a rotary heater come into contact with a cooking vessel and water when cooking a heater, thereby informing a user of the complex. It relates to a heater control method of a microwave oven.

In the related art, when a heater that rotates when cooking food in a microwave oven with a built-in heater touches a cooking object or the heater is not operated due to other mechanical defects, the heater cannot be detected. Intensive heating of the heater was applied only to the portion, causing the cooking object to burn.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and detects a malfunction in which the heater does not rotate in contact with a cooking vessel or food or rotates due to an abnormal motor during a swing operation of the heater. It is an object of the present invention to provide a method for controlling a heater of a composite microwave oven that can be notified to a user by an alarm.

1 is a block diagram of the control circuit of the present invention.

2 is an operational flow diagram of the present invention

* Explanation of symbols for main parts of the drawings

10: control unit 20: synchronous motor for heater rotation

SW1, SW2: Micro switch BZ: Alarm sound generating means

DP: Display

Hereinafter, the technical configuration for achieving the object of the present invention with reference to the accompanying drawings in detail.

FIG. 1 is a circuit diagram of the present invention. In the data input terminal of the control unit 10, micro switches 1 and 2 (SW1) and SW2 are turned on and off according to the operation of the synchronous motor 20 for rotating the heater. The buzzer BZ is connected to the data output terminal.

In addition, the display (DP) is connected to another output terminal of the controller 10.

Referring to the operation and effect of the present invention configured as described above based on the preferred embodiment as follows.

As shown in FIG. 1, when the heater cooking key is input, the controller 10 recognizes a signal of the micro switch, and then turns on the relay RY1 for driving the synchronous motor 20 of the internally heated heater.

The heater was rotated (rotation angle θ ) until the signal of the micro switch 2 (SW2), which was recognized as having reached the normal cooking position from the time when the signal of the micro switch 1 (SW1) was recognized by the microcomputer, was recognized. Then stop.

However, the following is a treatment method when the reverse rotation (when the heater touches the cooking vessel or the cooking water) occurs due to the rebound torque before reaching the normal position and when the rotation stops due to the abnormality of the motor (heater).

If the signal of the micro switch 2 (SW2) is not recognized by the microcomputer after the signal of the micro switch 1 (SW1) is recognized by the microcomputer, and the signal of the micro switch 1 (SW1) is recognized again, (the motor is reversed). Alarm sound together with an error message.

At this time, since the time point at which the input signal of the micro switch 1 (SW1) is recognized corresponds to the home position of the heater, the heater is placed at the home position when the relay for the synchronous motor is turned off.

If a signal of the micro switch 1 (SW1) is recognized after a predetermined time has elapsed (the time taken for the heater to rotate by θ = t1), if neither of the signals of the micro switch 1 or 2 is recognized, the motor (heater) The abnormality, that is, the rotation of the heater stopped in the middle, turns off the relay RY1 and generates an alarm sound with an error message.

2, when the heater cooking key is input (ST1), the micro switch 1 signal is detected (ST2), the motor driving relay is turned on (ST3), and the motor rotation operation is performed (ST4). When the signal of the micro switch 2 (SW2) is input (ST5), and when the signal is input (Y), the relay is turned off (ST6), the motor (heater) rotation stop (ST7), and cooked by heating the heater. The operation is completed through step ST8.

When the signal of the micro switch 2 (SW2) is not input (ST5) in the above (ST5), it detects whether a rebound torque is generated, and if it is generated (Y), the motor (heater) is reversely rotated (ST10). It detects whether the signal of the switch 1 (SW1) is input (ST11), if detected (Y), turns off the relay (ST12), and stops the rotation of the motor (ST23).

Subsequently, an operation of generating an error message and an alarm sound (ST14) is performed.

On the other hand, if the rebound torque is not generated in the above (ST9) (N) whether the time (t) the motor rotates is greater than or equal to the estimated time (t1) until the heater reaches the normal cooking position (rotation angle θ ). Detects (ST15), if it is wrong (N), starts from the step of turning on the motor driving relay (ST3), if correct (Y), turns off the relay (ST17), stops the rotation of the motor, error message and alarm sound. The operation of step ST18 is generated.

If the signal of the micro switch 1 (SW1) is not input in step ST11 (N), step ST16 of t≥ t1 is performed.

As described above, the present invention uses a microwave oven employing a high-speed rotary heater, and when the heater is cooked during the rotation of the heater, the heater is not in contact with the cooking vessel or the cooking water and the rotation operation is made in the middle of the motor. It is an invention that the user can detect the case and sends an error message so that the user can recognize it and promptly take an appropriate action.

Claims (1)

In a microwave oven employing a swing heater, a micro switch (SW1) (SW2) that is turned on and off in accordance with the rotation of the synchronous motor is installed, but the time is counted from the time when the signal of the micro switch is received from the control unit (10). Determining an abnormality in the motor in the absence of the signals of the micro switches 1 and 2 such that the rotation of the 20 and the time t1, which is considered to reach the gray angle θ , have passed; When the signal of the micro switch 1 (SW1) is input in the above it is determined that the motor rotates due to the rebound torque that the heater contacts the cooking vessel and generates an error message and an alarm sound, Stopping the motor by detecting that the heater has reached the home position when the signal of the micro switch 2 (SW2) is detected; When the time t1 to reach the rotation angle θ elapses, when the signal of the micro switch is sensed, the heater control method of a composite microwave oven, characterized in that implemented in the operation of determining that the heater is operating normally.

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