KR930007514B1 - Microwave range - Google Patents

Abstract

When the user starts the cooking process through the input keys, a basic pulse is produced by the time controlling unit inside the mycom which counts the common cycles input from the power supply unit. The cooking mode is determined by counting the common cycles. If the cooking mode is of first level, as the turntable turns, it calculates one turn of the turntable through the above-mentioned counting method and calculates the position of the turntable. The stop position of the turntable is determined by finding the following: when to stop the turntable motor from running; the turntable cycle counter which is set and reset as it counts the turntable cycle counter which is set and reset as it counts the turntable's cycle after the first turn and each time it reaches a cycle during the cooking process; and the present turning cycle when stopped, and one turning cycle.

Description

How to control turntable stop position of microwave oven

1 is a configuration diagram of a load driving system of a conventional microwave oven.

2 is a configuration diagram of a turntable stop position control system for a microwave oven according to the present invention.

3 shows a stop position of the turntable according to FIG.

4 is a signal flow diagram for the operation description of FIG.

* Explanation of symbols for main parts of the drawings

100: power supply means 101: micom

102: first load drive control means 103: fan motor

104: oven lamp 105: second load drive control means

106: turntable motor 107: key input means

The present invention relates to the control of the turntable rotation stop position of the microwave oven, and in particular, when the user stops cooking or when the cooking is stopped due to the completion of the cooking time, the turntable stops only within a predetermined range from a start point of rotation of the initial turntable. It relates to a turntable stop position control method of a microwave oven so that the user can easily take out food and containers.

The load driving system of the conventional microwave oven has a power supply means 1 for supplying operating power to each system by smoothing the input AC voltage even as shown in FIG. 1 of the accompanying drawings, and the power supply means 1. In accordance with the control signal of the microcomputer (2) to operate by a constant voltage supplied from a constant level supplied from the key input unit (not shown in the drawing) to drive the load to perform cooking, and the control signal of the microcomputer (2) A load drive control means 3 which is switched to supply an input AC voltage to each load, a fan motor 4 and a turntable motor 5 driven by an AC voltage applied according to the switching of the load drive control means 3; ) And oven lamp (6).

The load driving control means 3 is a resistor (R1) (R2) for dividing the voltage output from the output port (P1) of the microcomputer 2 and the level of the voltage through the resistor (R1) (R2) And excitation coil RL of the relay which is excited according to the switching of the transistor Q1 and switches its contact point RS to supply an input AC voltage to the load, and the excitation coil. It consists of the diode D1 which prevents the reverse voltage of (RL).

In this way, the load driving control apparatus of the conventional microwave oven is configured, when the user starts automatic cooking through the key input unit, the microcomputer 2 operates by a constant level constant voltage supplied from the power supply means 1 and starts cooking of the key input unit. According to the key signal, it outputs a high signal to the output port P1.

The high signal output from the output port P1 of the microcomputer 2 drops voltage through the resistors R1 and R2 of the load driving control means 3 to turn on the transistor Q1.

When the transistor Q1 is turned on, the DC voltage supplied from the power supply means 1 and applied to the power supply terminal Vcc is bypassed to the ground through the excitation coil RL and the transistor Q1 of the relay. The exciting coil RL is excited to turn on its contact point RS.

When the contact RS of the load driving control means 3 is turned on, an input AC voltage is applied to the fan motor 4, the turntable motor 5, and the oven lamp 6.

Accordingly, the fan motor 4, the turntable motor 5 and the oven lamp 6 are driven to suck outside air into the heating chamber, rotate the turntable, and heat food to perform cooking.

In this way, when the cooking is stopped through the key input unit during cooking or when the entire cooking time is completed, a low signal is outputted to the output port P1 of the microcomputer 2 to output the transistor Q1 of the load driving control means 3. Turned off).

When the transistor Q1 is turned off, the excitation coil RL turns off its contact RS to cut off the input AC voltage, whereby driving of the fan motor 4, the turntable motor 5, and the oven lamp 6 is stopped. And complete the cooking.

However, such a load control device of a conventional microwave oven, when the user stops cooking or when the cooking time is completed, the position of the container placed on the turntable because the turntable motor is immediately turned off, such as the fan motor and the oven lamp. Since the location of the food is not always constant, inconvenience occurs when the food or the container is taken out, and there is a problem that the cause of the burn of the user by mistake is provided.

Accordingly, an object of the present invention is that the turntable stops only when the user stops cooking or when the cooking is stopped due to the completion of the cooking time. It is to provide a method for removing the turntable stop position of the microwave oven so that the user can easily take out food and containers.

In order to achieve the object of the present invention, a cooking mode determination process of counting a commercial frequency of 60 Hz input and determining a cooking mode state, and rotation of the turntable motor when the cooking mode determined in the cooking mode determination process is the first dish. At the same time, a turntable stop position calculation process of obtaining and setting a turntable rotational cycle with the counter value and initializing a count value and proceeding cooking, and from the rotation table after the first turntable rotation after the first turntable in the cooking mode in the cooking mode determination process A turntable rotation cycle counting process which continuously counts the turntable rotation cycle and performs cooking while resetting and setting the count value every time the turntable rotation cycle reaches the set turntable rotation, and the cooking stop mode in the cooking mode determination process. Is the turntable cycle of the currently counted turntable and the set turntable As a result of the comparison with a single rotation period, the turntable stop position determination process for determining whether to stop the turntable motor is achieved. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of the turntable stop position control system of the present invention. As shown in FIG. 2, the power supply means 100 rectifies and smoothes the input alternating voltage to supply an operating voltage to each system, and the key input means. According to the function key signal of 107, the commercial frequency of 60 Hz from the power supply means 100 is counted in real time, and the cooking mode is determined based on the counted value and the key signal input from the key input means 107. A resistance for controlling the driving of the fan motor 103 and the oven lamp 104 is switched according to the control signal of the microcomputer 101 and the microcomputer 101 driving the load simultaneously or differently according to the determined cooking mode. (R1) (R2), transistor Q1, excitation coil RL1, first load drive control means 102 composed of relay contact RS1 and diode D1, and control signal of the microcomputer 101. Is switched according to the turntable motor 106 It constitutes a resistance (R3) (R4), a transistor (Q2), the exciting coil (RL2), the contact (RS2) and a diode (D2), the second load drive control means (105) to the relay for controlling the drive.

FIG. 4 is a signal flow diagram illustrating the operation of FIG. 2. As shown therein, a cooking mode determination process (ST100) for counting commercial frequencies every second and determining a cooking mode state, and the cooking mode determination process (ST100). If the cooking mode determined in the first cooking is the first dish, the fan motor 103, the oven lamp 104, and the turntable motor 106 are rotated, and the turntable rotates one turn cycle at the same time as the turntable motor 106. TT) is obtained by setting the count value after setting and then turning the table stop position calculation process (ST101) and the cooking mode determined in the cooking mode determination process (ST100), if the cooking mode is the cooking turn mode after the first turntable turn A turntable that continuously counts the turntable rotation period from the rotation book and performs cooking while resetting and setting the count value a plurality of times each time the turntable rotation cycle is reached. Turntable motor is stopped as a result of the comparison between the rotation cycle of the currently counted turntable and the set turntable rotational cycle if the mode determined in the table rotation cycle counting process ST102 and the cooking mode discrimination process ST100 is the cooking stop mode. A turntable stop position determination process (ST103) for determining whether or not is performed.

The operation and effects of the present invention configured as described above will be described in detail with reference to FIGS. 2 to 4 as follows.

First, when the user starts cooking through the key input means 107, the microcomputer 101 generates a basic pulse by counting the commercial frequency of 60 Hz input from the power supply means 100 through the internal time control means.

That is, one second is calculated by frequency counting, and when one second is reached, a one second flag for state transition is set (ST1), the commercial frequency count ram of the time control means is cleared, and the commercial frequency is continuously counted up.

After that, if the setting state of the flag is searched for 1 second (ST2), if the cooking stop key is input from the key input means 107 or the door of the microwave oven is set in the cooking mode discriminating means, the stop flag is set, and If cooking is in progress, the stop flag is reset, and if cooking is the first time, the cooking first flag is set (ST3).

Therefore, after the 1 second flag search, the flag of the current cooking state is searched (ST4) (ST5) when the cooking is the first start, that is, when the first flag is set, the output port (P1) (P2) of the microcomputer 101. The high signal is output (ST6).

The high signal output from the output port (P1) (P2) of the microcomputer 101 is the transistor (Q1) (Q2) through the resistor (R1-R4) of the first and second load drive control means (102) 105 ) Will turn on.

When the transistors Q1 and Q2 are turned on, the contact coils RS1 and RS2 are turned on by the excitation coils RL1 and RL2 of the relay, so that the input AC voltage is converted into the fan motor 103 and the oven lamp. 104 and the turntable motor 106.

Accordingly, the fan motor 103, the oven lamp 104, and the turntable motor 106 are driven to perform cooking. At this time, the turntable motor 106 rotates and the time control means in the microcomputer 101 simultaneously. Calculate the turntable TT of the turntable with the counted value and store it in the data RAM (ST7), and reset the cooking flag and the 1 second flag for changing the state (ST8) (ST9) to perform cooking. do.

In the search step ST4 or ST5, if the cooking is in progress, that is, if the stop flag and the initial flag are reset, the rotation period value (TTC) of the turntable is continuously counted so that the rotation state of the turntable phenomenon can be known. After that (ST10), the rotation cycle value TTC of the counted turntable is compared with the rotation cycle value TT of the turntable set in the data RAM (ST11). If it is larger than TT), it is set to 1 (ST12). If it is smaller, the 1 second flag is reset, and the rotation period value (TTC) of the turntable is continuously counted up.

In this way, during the first cooking start or during cooking, even if one turn cycle (TT) of the turntable set and the turn cycle value (TTC) of the turntable currently being rotated coincide, the 1 second flag is reset and the turntable is rotated again. Only the operation of up counting is repeated.

That is, as an example, assuming that one rotation period TT of the set turntable is 10 seconds, the turntable rotation period value TTC counted after the turntable operation is reset every 10 seconds.

When the user inputs the cooking stop key through the key input means 107 or stops cooking through the door open, that is, when the stop flag is set, the output port P1 of the microcomputer 101. Outputs a low signal (ST13) to immediately turn off the fan motor 103 and the oven lamp 104 through the first load drive control means 102, and to continuously increase the rotation period value (TTC) of the turntable ( ST14) Compare and increase the rotation period value (TTC) of the turntable and the one rotation period (TT) of the turntable set in the data RAM (ST15). A low signal is output to the port P2 (ST16) to stop the turntable motor 105 through the second load drive control means 105 and reset the 1 second flag.

As such, when the turntable motor 106 is stopped when the turn cycle of the set turntable and the turn cycle count (TTC) of the counted turntable coincide with each other, as shown in FIG. Alternatively, the rotation is stopped within a predetermined specified range from the start of rotation without immediately stopping by the inertial force of the turntable motor 106 due to the weight of the food.

As described in detail above, in the present invention, when the progress of cooking is stopped during cooking or when the cooking progress is stopped due to the elapse of cooking time, the turntable motor is positioned only at the same position as the starting point of cooking or within a specified range. It is designed to stop so that the user can have convenience in taking out food and containers.

Claims (2)

If the cooking mode determination process of counting the common frequency and determining the cooking mode state, and the cooking mode determined in the cooking mode determination process is the first dish, the turntable motor is rotated and the turntable 1 rotation period is calculated and set with the count value and counted. Turntable stop position calculation process for initializing the value and cooking process, and if the cooking progress mode in the cooking mode discrimination process, the turntable rotation cycle is continuously counted from the turntable after the first turntable rotation, and the turntable is set to the count value. Turntable rotation cycle counting process for performing cooking while resetting and setting the count value every time one rotation cycle is reached, and rotation cycle of the currently counted turntable and turntable one turn cycle in the cooking stop mode in the cooking mode determination process. Of turntable motor is stopped as a result of comparison A microwave turntable stop position control method characterized by the turntable constituted by any stop position determining process. The method of claim 1, wherein in the cooking stop mode, the driving of the fan motor and the oven lamp are stopped, and the rotation is stopped until the rotation period value of the turntable of the turntable motor coincides with the one rotation period of the set turntable. How to control the turntable stop position of the microwave oven.