JP2000021560A - High-frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a high-frequency heating device that eliminates wasteful power consumption when the device is not used. SOLUTION: The used and unused states of a high-frequency heating device are determined by detecting the opening or closing operation of a door based on a signal of a door opening and closing detection means 26, and when an unused state is determined, a control circuit 18 cuts off the supply of power to the control circuit itself. Thereby, required power consumption can be saved if the control circuit itself continues functioning. In the meantime, when a weight detection means 24 has detected the weight of food, it is determined that there is a strong possibility that cooking is about to be performed, and the display of the information required for continuing the cooking and the like is prevented from being interrupted by setting a longer standby time, so that the high-frequency heating device can conveniently and safely be used as a cooker without hurrying a user to start the cooking or confusing the user.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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).

[0002]

2. Description of the Related Art Conventionally, a high-frequency heating device controlled by a control circuit having a microcomputer has been supplied with power to the control circuit even when cooking is not performed (for example, Japanese Utility Model Laid-Open No. 55-1164). ).

[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.
Power was always supplied to the control circuit.

The fact that power is always supplied to the control circuit of the apparatus, which has a very short usage time per day in view of usage, is very wasteful even if the power consumed is small.

[0005] However, if the power supply is cut off while the start of heating cooking is troublesome, inconvenience arises in terms of usability.

[0006]

In order to solve the above-mentioned problems, the present invention provides a heating chamber, a magnetron for supplying high-frequency energy to the heating chamber, a door for opening and closing an opening of the heating chamber, and a door for opening and closing the heating chamber. Door opening / closing detecting means for detecting each opening / closing operation and outputting a signal, weight detecting means for detecting the weight of food placed in the heating chamber, and heating start while a predetermined timer time elapses after the door is closed. When the operation has not been performed, it is determined that the high-frequency heating device is in an unused state, and when the weight detecting means detects the food weight, the predetermined timer time is used to detect the food weight. A high-frequency heating device is configured with a control circuit that has a function to set a value longer than that when there is no power supply and to shut off power supply to itself when the set timer time has elapsed. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is constructed as described above. The control circuit detects the opening / closing operation of the door based on the signal of the door opening / closing detecting means and uses the high frequency heating device.
The state of non-use is determined, and when the non-use is determined, the supply of power to the control circuit itself is cut off. As a result, the power consumption required when the user keeps functioning is reduced. At this time, when the weight detecting means detects the food weight, it is determined that the cooking is likely to be executed, and a longer waiting time is set to display information necessary for continuing the cooking. Is not interrupted,
It has been made convenient and safe to use as a cooker without having to rush or panic.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 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 generator 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. 1
6 is linked with opening and closing of the door, turns on when the door is opened, and turns on when the door is closed.
This is a switch that performs FF.

Reference numeral 17 denotes a relay of power switching means connected in parallel to the door switch 16, which 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 by a parallel circuit of the door switch 16 and the relay 17 and generates a DC voltage.

Reference numeral 21 denotes a reset circuit which outputs a reset signal when the power supply circuit 20 is connected to the commercial power supply 1 and a DC voltage rises. 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.

Reference numeral 24 denotes a quantity sensor circuit for detecting the weight of food, 25 denotes a temperature sensor circuit for detecting the temperature of the oven, 26 denotes a door switch circuit for detecting the open / closed state of the door, and 27 denotes a key input. A display circuit for displaying the type of heating source, the heating time, the weight of the detected food, the calculation result of the microcomputer 19 and a message for the cooker selected by the circuit 23, and 28 a command of the microcomputer 19 Relays 12, 13, 14, 1
5 is an output circuit for driving 5 and 17.

Next, the operation of the embodiment configured as described above will be described.

The contact states of the switches 3, 4, 5, 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 control circuit 18 is supplied with electric power by turning on the door switch 16. When the power is supplied, the power supply circuit 20 generates a DC power supply necessary 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.

The operation of the microcomputer 19 after initialization will be described with reference to the general flow of FIG.

This general flow depends on whether the relay 17 is turned on or off.
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, a reset signal is output, and the program of the microcomputer 19 is initialized. The microcomputer 19 uses the frequency signal input from the Hz signal circuit 22 as a reference signal for time management and the like.

Next, the microcomputer 19 turns on the relay 17 and sets a fixed timer time. As the timer time, a plurality of different values are set so that different times are managed depending on the situation.

For example, if the door is closed without placing food in the heating chamber (in a state where the signal of the quantity sensor circuit 24 is not generated), the first timer time t1 is subtracted from the time when the door is closed. Is started, and within the first timer time t1, a key input operation for instructing the start of heating or correcting the progressing order of the heating operation is not performed (state in which the signal of the key input circuit 23 is not generated). If the door is opened and food of a predetermined weight or more is not installed, the control circuit 18 turns off the relay 17 when the remaining time becomes zero.

Alternatively, with the door closed,
If the quantity sensor circuit 24 has generated a signal indicating that a food item having a specified value or more is installed, the control circuit 18 sets the second timer time t2 and subtracts the second timer time. If no signal such as the start of heating is generated during that time, the control circuit 18 turns off the relay 17 when the remaining time becomes zero.

In addition, when the door is closed without food being set in the state where the heating mode is set from the key input circuit 23, the control circuit 18 sets the third timer time t3. At the same time, the third timer time t3 is subtracted, and the control circuit 18 turns off the relay 17 when the remaining time becomes zero unless the food is installed and a signal is generated from the quantity sensor circuit 24 during that time. I do.

In addition, when cooking is performed with taking out and re-installing the food, if the door is not opened, that is, if the food is left without being taken out, the control circuit 18 performs the previous heating. Immediately after that, the fourth timer time t4 is set and subtracted. If the door is not opened during that time, the relay 17 is turned off when the remaining time becomes zero.

The first to fourth timer times t1 to t1
When setting t4, the length of the cooking time must be determined in due consideration of the flow of the cooking operation. In particular, with regard to the timer time t4, for example, the food in the vessel becomes compatible with the added condiments and the like. It is necessary to consider that the time (seasoning time) is indispensable.

By the way, when it is necessary to always display the clock, the relay 17 is turned on continuously by the key input setting.
It is needless to say that N can be set.

In this way, a cooker which is easy to use and has no inconvenience can be realized.

[0029]

As described above, according to the present invention, when it is determined that the cooking device is not used as a cooker, the power supply to the control circuit is cut off when a predetermined standby time has elapsed, so that useless power is consumed. Could not be consumed. In addition, when food is installed in the heating chamber, in that case, it is determined that there is a high possibility that the cooking will be performed, and a longer standby time is set to provide information necessary for continuing the cooking. Display is not interrupted,
The cooking work has not been hastened or panicked, and it has become convenient and safe to use.

[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 diagram of the same.

[Explanation of symbols]

1: commercial power supply, 8: electric heater, 9: electric heater, 1
0: magnetron, 16: door switch, 17: relay, 18: control circuit, 19: microcomputer, 20: power supply circuit, 21: reset circuit, 23: key input circuit, 24:
Quantity sensor circuit, 26: door switch circuit

Claims (1)

[Claims] 1. A heating chamber, a magnetron that supplies high-frequency energy into the heating chamber, a door that opens and closes an opening of the heating chamber, and a door opening / closing detection unit that captures each operation of opening and closing the door and outputs a signal. ), Weight detection means (24) for detecting the weight of the food placed in the heating chamber, and when the heating start operation is not performed during a predetermined timer time after the door is closed, It is determined that the high-frequency heating device is in a non-use state, and at this time, when the weight detecting means (26) detects the food weight, the predetermined timer time is used when the food weight is not detected. A control circuit (18) having a function of setting a longer value and interrupting the supply of power to itself when the set timer time has elapsed. High frequency heating device.