JP3583732B2 - High frequency heating equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-frequency heating device such as a microwave oven controlled by a control circuit including a microcomputer (hereinafter, referred to as a microcomputer).
[0002]
[Prior art]
Conventionally, in a high-frequency heating device controlled by a control circuit having a microcomputer, power is supplied to the control circuit even when cooking is not performed (for example, Japanese Utility Model Laid-Open No. 55-1164).
[0003]
[Problems to be solved by the invention]
In a high-frequency heating device operated by a control circuit including a microcomputer, power is always supplied to the control circuit for key input detection and clock operation even when food is not heated.
[0004]
The fact that power is always supplied to the control circuit of the device, which has a very short usage time per day from the actual usage, is very wasteful even if the consumed power is small.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and has a key input circuit for setting the operation content of a heating source for heating food, and a door opening / closing detecting means for detecting opening / closing of a door. A control circuit for controlling the operation, a power supply circuit serving as a power supply for the control circuit, and a door switch interposed between a commercial power supply and the power supply circuit, which is turned on when the door is opened and turned off when the door is closed. In the high-frequency heating device, the control circuit sets a predetermined timer time based on the turning on of the door switch when the door is opened, and starts subtracting the timer time after the door is closed, during which key input is performed. When the key input signal from the circuit is not input, the supply of power to the control circuit is stopped at the end of the subtraction, and when the door is opened after the supply of power is stopped, the power supply from the power supply circuit is restarted. It was to be.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is configured as described above, and the control circuit sets a predetermined timer time based on ON of the door switch by opening the door, and starts subtracting the timer time after the door is closed. If the key input signal from the key input circuit is not input during that time, the supply of power to the control circuit is stopped at the end of the subtraction, and after the power supply is stopped, when the door is opened, the power supply circuit outputs The energization is restarted, which determines whether the high-frequency heating device is used or not, and when it is determined that the high-frequency heating device is not used, the power supply to itself is cut off, so that the device itself can function. If you continue to do so, you will save power consumption.
[0007]
【Example】
An embodiment of the present invention will be described below with reference to FIG.
[0008]
FIG. 1 is a control circuit diagram of a microwave oven. 1 is a commercial AC power supply, 2 is a current fuse, and 3 and 4 are main door switches that are turned on / off in conjunction with opening and closing of doors. Reference numeral 5 denotes a door switch which also serves as a monitor switch. The door switch 5 blows the current fuse 2 when a failure occurs in which the main door switches 3 and 4 do not turn off when the door is opened. 6 is an oven lamp for illuminating the heating chamber during cooking, 7 is a table motor for rotating a turntable at the bottom of the heating chamber, 8 is an electric heater of a heating source, a grill heater provided on the ceiling of the heating chamber, and 9 is the same. Is an oven heater provided at the bottom of the heating chamber, 10 is a high frequency generation source composed of a magnetron or the like, and 11 is a fan motor for cooling the high frequency generation source 10. Reference numerals 12, 13, and 14 are relays which are controlled by a control circuit described later and connect the electric heaters 8 and 9 and the high-frequency generation source 10 to a commercial power supply. Reference numeral 15 denotes a relay, which is provided between the commercial power supply 1 and the power load circuit including the oven lamp 6, the table motor 7, the electric heaters 8, 9, the high frequency generation source 10, and the fan motor 11, and is turned on by a control circuit described later. / OFF control. Reference numeral 16 denotes a switch which is turned on when the door is opened and turned off when the door is closed, in conjunction with opening and closing of the door. A relay 17 is connected in parallel to the door switch 16 and serves as a power switch. The relay 17 is ON / OFF controlled by a control circuit described later. Reference numeral 18 denotes a control circuit, and reference numeral 19 denotes a microcomputer which is an information processing device of the control circuit 18. Reference numeral 20 denotes a power supply circuit of the control circuit 18, which is connected to the commercial power supply 1 and generates a DC voltage by the above-described parallel circuit of the door switch 16 and the relay 17. Reference numeral 21 denotes a reset circuit which, when the power supply circuit 20 is connected to the commercial power supply 1 and a DC voltage rises, detects the DC voltage and outputs a reset signal. Reference numeral 22 denotes an Hz signal circuit that detects the frequency of the commercial power supply 1 connected to the power supply circuit 20 and outputs the detection result. Reference numeral 23 denotes a key input circuit for setting operation contents such as selection of a heating source and setting of a heating time. 24 is a quantity sensor circuit for detecting the weight of food, 25 is a finished sensor circuit for detecting the finished temperature of the food, 26 is a door switch circuit for detecting the open / closed state of the door, and 27 is a key input circuit 23 A display circuit for displaying the type of heating source, the heating time, the weight of the detected food as well as the calculation result of the microcomputer 19 and a message for the cook, and 28 based on the instruction of the microcomputer 19 The output circuit drives the relays 12, 13, 14, 15, and 17.
[0009]
Next, the operation of the embodiment of the present invention configured as described above will be described.
[0010]
The contact states of the switches 3, 4, 5, and 16 in FIG. 1 are those when the door is closed. When the door is closed, the main door switches 3 and 4 are in the ON state, and the switch 5 contacts the contact point b to connect the load to the commercial power supply 1. Since the door switch 16 is OFF, the supply of power to the control circuit 18 through the door switch 16 is shut off.
[0011]
Next, when the door is opened, the switches 3 and 4 are turned off, and the monitor switch 5 is brought into contact with the contact point a to disconnect the load from the commercial power supply 1. Power is supplied. When the power is supplied, the power supply circuit 20 generates a DC power supply required for the operation of the control circuit 18. Further, when the reset circuit 21 detects the rise of the DC power of the power supply circuit 20 and outputs a reset signal to the microcomputer 19, the program of the microcomputer 19 is initialized.
[0012]
The operation of the microcomputer 19 after the initialization will be described with reference to a general flow in FIG.
[0013]
This general flow shows only control related to ON / OFF control of the relay 17. When the door is first opened to put food into the heating chamber, the door switch 16 is turned on, and power is supplied to the power supply circuit 20 of the control circuit 18. Then, the reset circuit 21 detects the rise of the power supply of the power supply circuit 20 and outputs a reset signal, so that the program of the microcomputer 19 is initialized. Then, the microcomputer 19 uses the frequency signal input from the Hz signal circuit 22 as a reference signal for other time management. Next, the microcomputer 19 turns on the relay 17 and sets a fixed timer time. Then, after the door is closed, the timer time subtraction is started. If no key input signal from the key input circuit 23 or a door opening / closing signal from the door switch circuit 26 is input during that time, at the time when the remaining time becomes zero. The relay 17 is turned off.
[0014]
If a signal is input from the key input circuit 23 or the door switch circuit 26 before the remaining time becomes zero, the timer time is reset and the ON of the relay 17 is extended. The time value of this timer is set to be long enough for the cook to set the cooking menu from the key input circuit 23 while watching the display circuit 27 or to confirm on the display circuit that cooking is completed. Needless to say.
[0015]
Also, when the cook puts food into the heating chamber, closes the door, sets the heating function through the key input circuit 23, and starts heating, the microcomputer 19 switches from the standby state (timer subtraction state) to the cooking state. Become. After the cooking is completed, the microcomputer 19 resets the timer and starts the subtraction. Note that when the door is opened and closed according to the cooking program, it is not determined that the microwave oven has been unused even if the door is opened and then closed again. The relay 17 is turned off only when there is no door opening or closing or key input within a predetermined timer period after the start of the operation, so that the supply of power to the control circuit 18 is cut off.
[0016]
Then, when the door is opened after the relay 17 is turned off, the power supply to the control circuit 18 is restarted.
[0017]
Needless to say, the relay 17 can be always turned on continuously by the key input setting when the clock display is always required.
[0018]
【The invention's effect】
According to the present invention described above, the control circuit sets the predetermined timer time based on the ON of the door switch by opening the door, and starts subtracting the timer time after the door is closed, during which the key input circuit starts to operate. When the key input signal is not input, the power supply to the control circuit is stopped at the end of the subtraction, and after the power supply is stopped, when the door is opened, the power supply from the power supply circuit is restarted. Therefore, a high-frequency heating device that does not consume wasteful power by not energizing the control circuit when not being used as a cooker can be obtained. In addition, by controlling the operation related to the opening and closing operation of the door, it is possible to accurately grasp the use / non-use state of the high-frequency heating device and perform accurate energy saving control.
[0019]
Further, when the door is opened, the power supply to the control circuit is resumed, so that a new power switch or the like is unnecessary, and the cook can cook with the same convenience as before.
[Brief description of the drawings]
FIG. 1 is a control circuit diagram of one embodiment of the present invention.
FIG. 2 is a general flow diagram of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Commercial power supply 8 Electric heater 9 Electric heater 10 Magnetron 16 Door switch 17 Relay 18 Control circuit 19 Microcomputer 20 Power supply circuit 21 Reset circuit 23 Key input circuit 26 Door switch circuit

Claims (1)

A control circuit for controlling the operation of the heating source, including a key input circuit for setting the operation content of the heating source for heating the food, and a door opening / closing detecting means for detecting opening / closing of the door, and a power supply serving as a power supply for the control circuit High frequency heating comprising a circuit, a door switch interposed between a commercial power supply and the power supply circuit, which is turned on when the door is opened and turned off when the door is closed, and a relay connected in parallel to the door switch. In the device, the control circuit turns on the relay based on the turning on of the door switch by opening the door, sets a predetermined timer time, starts subtracting the timer time after the door is closed, and performs key input during that time. If the key input signal from the circuit is not input, OFF the relay after the timer time subtraction ends, it stops power supply from said power supply circuit, further after the stoppage of power supply, de High-frequency heating apparatus, wherein a power supply from the opened is when the power supply circuit is resumed.

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