JP3517096B2 - High frequency heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device such as a microwave oven controlled by a control circuit having a microcomputer (hereinafter referred to as a microcomputer). 2. Description of the Related Art Conventionally, in a high-frequency heating apparatus 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 Application Laid-Open No. 55-55). [0003] A high-frequency heating device operated by a control circuit provided with a microcomputer can detect a key input or operate a clock even when food is not heated. To
Power was always supplied to the control circuit. [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 viewpoint of actual use, is very wasteful even if the consumed power is small. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is directed to a heating source for heating food.
Key input circuit for setting operation details and door open / close detection
Door opening and closing detecting means for controlling the operation of the heating source.
A control circuit, a power supply circuit serving as a power supply for the control circuit,
Opening the door between the commercial power supply and its power supply circuit
Door switch that turns ON when closed and turns OFF when closed
High with a relay connected in parallel with the door switch
In the frequency heating device, the control circuit is used for opening a door.
Power supply from commercial power supply by turning on the door switch
The control circuit turns on the relay and sets the timer
And set the timer time after the door is closed
Of the key input circuit during that time
If no signal is input, turn off the relay and
The power supply from the power supply to the power supply circuit is stopped . [0006] The present invention is configured as described above, the control circuit, the door switch by opening the door
When the switch is turned on, power is supplied from the commercial power supply and the control circuit
Turns on the relay and sets a predetermined timer time.
Start subtracting the timer time after the door is closed
During that time, the key input signal from the key input circuit is input.
Power supply circuit from commercial power supply
Supply of power to the
With determining the status of use and non-use of high-frequency heating apparatus by, so as to cut off the power supply to itself when it is determined that the unused, to save power consumption required when itself continues to function I did it. An embodiment of the present invention will be described below with reference to FIG. 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 which are turned on / off in response to 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. 12, 1
Reference numerals 3 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. Reference numeral 17 denotes a relay which is connected in parallel with the door switch 16 and serves as power switching means.
N / OFF control is performed. 18 is a control circuit,
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 the food, 25 is a finished sensor circuit for detecting the finished temperature of the food, 2
6 is a door switch circuit for detecting the open / closed state of the door, 27
Is the microcomputer 1 in addition to the type of heating source, the heating time, and the weight of the food detected by the key input circuit 23.
Reference numeral 28 denotes a display circuit for displaying the calculation result of 9 and a message for the cooker, and 28 denotes an output circuit for driving the relays 12, 13, 14, 15 and 17 based on a command from the microcomputer 19. Next, the operation of the embodiment of the present invention configured as described above will be described. 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. Next, when the door is opened, switches 3 and 4
At the same time as the FF, the monitor switch 5 comes into contact with the contact a to disconnect the load from the commercial power supply 1 and the door switch 16 is turned on to supply power to the control circuit 18. 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 supply of the power supply circuit 20 and outputs a reset signal to the microcomputer 19,
The program of the microcomputer 19 is initialized. The operation of the microcomputer 19 after initialization will be described with reference to the general flow of FIG. This general flow is determined by the ON / OFF state of the relay 17.
Only the control related to the OFF control is shown. 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. 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 relay 17
N 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. When the cooker enters the food into the heating chamber, closes the door, sets the heating function through the key input circuit 23, and starts heating, the microcomputer 19 changes from the standby state (timer subtraction state). It becomes a cooking state. 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, so that the cooking program is completed or canceled. The relay circuit 17 is turned off only when the door is not opened or closed or the key is not pressed within a predetermined timer time after the control circuit 1
8 is cut off. When the door is opened after the relay 17 is turned off, the power supply to the control circuit 18 is resumed. In addition, in the case where the clock display is always required,
It goes without saying that the relay 17 can be always turned on continuously by the key input setting. As described above, according to the present invention, the control circuit is provided for the door.
Power from commercial power supply by turning on door switch by opening
Is supplied, the control circuit turns on the relay and the specified timer
-Set time and timer after door is closed
-Time subtraction starts, during which time the key input circuit
-If no input signal is input, turn off the relay
Power supply from the power supply to the power supply circuit.
Therefore, a high-frequency heating device that does not consume wasteful power by preventing power from being supplied to the control circuit when it is not 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.

[Brief description of the drawings] FIG. 1 is a control circuit diagram according to an embodiment of the present invention. FIG. 2 is a general flow chart of the same. [Explanation 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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24C 7/02 521

Claims (1)

(57) [Claims] [Claim 1] Setting the operation details of a heating source for heating food
Key input circuit and door open / close detection
A control circuit for controlling the operation of the heating source with output means,
A power supply circuit serving as a power supply for the control circuit; a commercial power supply;
It is interposed between the power supply circuit and turns ON when the door is opened.
Door switch that turns off when closed and this door switch
High-frequency heating device consisting of a relay connected in parallel to the
The control circuit may further include a door switch for opening the door.
When the switch is turned on, power is supplied from the commercial power supply and the control circuit
Turns on the relay and sets a predetermined timer time.
Start subtracting the timer time after the door is closed
During that time, the key input signal from the key input circuit is input.
Power supply circuit from commercial power supply
A high-frequency heating device characterized in that the supply of power to the device is stopped .