JPH11238577A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooker with reduced stand-by power. SOLUTION: This device is provided with a door switch 6 for a door, a switch 7, the primary side 9 of a transformer 8 serially connected to a parallel circuit of both the switches 6, 7, and a control part 10 connected to the secondary side 12 of the transformer 8, the control part energizing as the door is opened to close the door switch 6 which closes the switch 7 to hold the energizing, and the control part 10 opens the switch 7 at a specified time after the door has been closed to open the door switch 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooking device.

[0002]

2. Description of the Related Art Conventionally, this type of cooker is disclosed in
No. 21536. According to this publication, there is disclosed a cooker in which a heat source generated by burning a burner and a heat source using high-frequency radio waves are combined. In this cooker, a transformer is connected to an AC power supply, and a control unit is connected to a secondary side of the transformer.

[0003]

As described above, in the conventional cooking device, the primary side of the transformer is connected to the AC power supply.
As a result, there is a drawback that the transformer is energized and consumes several watts of power even when cooking is not performed as long as the power plug of the cooker is inserted into the power outlet in the home. Therefore, the present invention provides a cooker in which standby power (power consumption when cooking is not performed) is reduced in consideration of such conventional drawbacks.

[0004]

According to a first aspect of the present invention, there is provided a door switch for a door, a switch, and a transformer connected in series with a parallel circuit of both switches.
A secondary side and a control unit connected to the secondary side of the transformer,
When the door is opened and the door switch is closed, the energized control unit closes the switch and keeps energized, and the control unit opens the switch a predetermined time after the door is closed and the door switch is opened.

[0005] A second invention is a door switch for a door,
A door having a switch, a primary side of a transformer connected in series with a parallel circuit of the two switches, a control unit connected to the secondary side of the transformer, and a cancel key connected to the control unit; When the cancel key is pressed while the door switch is open, the control unit opens the switch after a predetermined time.

Preferably, the first or second invention is such that the control unit closes a switch when another key connected to the control unit is input within a predetermined time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cooker 1 according to an embodiment of the present invention will be described with reference to the electric circuit diagram of FIG. In FIG. 1, a current fuse 2, a manual switch 3, and an interior light 4 are connected in series to a commercial power supply 5. Current fuse 2
A parallel circuit of a door switch 6 and a switch 7 for a door;
The primary side 9 of the transformer 8 is connected to the commercial power supply 5 in series.

The control unit 10 comprises, for example, a microcomputer or the like, and its input terminal is connected to the secondary side 12 of the transformer 8 via a power supply circuit 11. Each of the input terminals of the control unit 10 includes an oven key 13, a microwave key 14, a time setting key 15, a temperature setting key 16,
A start key 17 and a cancel key 18 are connected.

The oven key 13, the microwave key 14, the time setting key 15, the temperature setting key 16,
The start key 17 is collectively referred to as another key 19. A first drive unit 20, a second drive unit 21, a third drive unit 22, and a fourth drive unit 23, each of which includes a relay circuit or the like, are connected to each output terminal of the control unit 10. The output line of the first drive unit 20 is connected to a switch (first relay) 7, and the first drive unit 20 is configured to open or close the switch 7.

The lead wire 24 is connected to the NO contact of the door switch 6, and the lead wire 25 is connected to one side of the commercial power supply 5. The monitor switch 26 is connected between the lead wires 24 and 25. The lead wire 27 is connected to the lead wire 25 via another door switch 28. The series circuit of the second relay 29 and the turntable motor 30 is connected between the lead wire 24 and the lead wire 27. The output line of the second drive unit 21 is connected to the second relay 29.

The series circuit of the third relay 31 and the circulation fan motor 32 is connected between the lead wire 24 and the lead wire 27. The cooling fan motor 33 is connected between the connection point between the third relay 31 and the circulation fan motor 32 and the lead wire 27. The output line of the third drive unit 22 is
It is connected to a relay 31.

The lead wire 24 is connected to the lead wire 27 via a fourth relay 34, an overheat protector 35, and a primary side 37 of a high-voltage transformer 36. The output line of the fourth drive unit 23 is connected to the fourth relay 34. The secondary side 38 of the high-voltage transformer 36 is connected to a magnetron 39.

One side of each of the high-voltage capacitor 40, the resistor 41, the high-voltage capacitor 42, and the resistor 43 is connected and grounded via a diode 44. A fifth relay 45 is connected between the other side of the high-voltage capacitor 40 and the other side of the high-voltage capacitor 42. The other side of the high-voltage capacitor 40 is connected to one end of a secondary side 46 provided in the high-voltage transformer 36. A fifth drive unit (not shown) is connected to an output terminal of the control unit 10, and an output line of the fifth drive unit is connected to a fifth relay 45. The cooking device 1 is constituted by the above components.

Next, the operation of the cooking device 1 will be described with reference to the time charts of FIGS. First, at time a (FIG. 2),
Door is closed, contact C of door switch 6 and contact NO
Is connected, and the door switch 6 is open (the contact point C and the contact point NC are non-conductive). As a result, the primary side 9 of the transformer 8 is not energized even if the power plug (not shown) of the cooking device 1 is inserted into a power outlet at home. Also, no current is supplied to the loads 30, 32, 33, 37, etc. connected to the lead wire 24. As a result, at the time point a, the power consumption of the cooking device 1 is zero.

Then, the user prepares the object to be cooked and puts it in a container (both not shown). Next, when the user opens the door (time point b), the door switch 6 is closed (the contact point C and the contact point NC are conductive). As a result, the primary side 9 of the transformer 8 is energized, the secondary side 12 is energized, and the control unit 10 is also energized via the power supply circuit 11 (a predetermined power supply voltage is applied).

As a result, the control section 10 starts operating, the control section 10 outputs a Hi signal to the first drive section 20, and the first drive section 20 turns on the switch 7 (at time point c). In this state, the primary side 9 is energized via the switch 7, so that even when the door is closed, the control unit 10 continues to be energized (energized).

Next, the user places the container containing the items to be cooked on a turntable (not shown) in the refrigerator, and closes the door (at a time point d). As a result, the door switch 6 is opened (the contact C and the NC are non-conductive, the contact C and the NO are conductive), and the control unit 10
Is kept energized and continues to operate.

The control unit 10 measures the elapsed time from when the door is closed and the door switch 6 is opened, and measures a predetermined time (for example, 1).
0 minutes). For example, when the user sets the door switch 6
If another key 19 is input within a predetermined time after opening of the key (for example, the microwave oven key 14 is pressed, and the time setting key 15
Is pressed, the temperature is set, the temperature is set by pressing the temperature setting key 16, and the start key 17 is pressed), and the control unit 10 keeps closing the switch 7. In this way, by inputting another key 19 and pressing the start key 17, cooking starts (time e).

As a result, the control unit 10 controls the driving units 21 and 2
2 and 23, and outputs a Hi signal to the second relay 29 and the third relay 29.
The relay 31 and the fourth relay 34 are closed. Thus, the turntable motor 30 and the circulation fan motor 3
2, the cooling fan motor 33 and the magnetron 39 are energized. As a result, the object to be cooked in the container on the turntable is heated by high frequency while rotating, cooked, and the magnetron 39 is cooled by a cooling fan (not shown).

When the time set by the time setting key elapses, the control unit 10 controls the driving units 21, 22 and 23.
Then, the Lo signal is outputted to stop the energization of the parts 30, 32, 33, 39, etc., and the cooking is completed (time f).

Next, when the user opens the door (time point g),
The door switch 6 closes. The user takes out the container containing the object to be cooked from the inside of the refrigerator, closes the door (at time point h), and opens the door switch 6. As described above, the control unit 10 controls the door switch 6
When the door switch 6 is opened (time point h) some time after the is closed, a standby state is entered. At this time, the control unit 10 monitors whether there is an input from another key 19.

Then, within a predetermined time (for example, 10 minutes) after entering the standby state, the control unit 10 transmits another key 1
If it is determined that there is no input from the control unit 9, the control unit 10 opens the switch 7 a predetermined time after the door switch 6 is opened (time i). As a result, the primary side 9 and the control unit 10 are de-energized, the power consumption of the cooking appliance 1 becomes zero, and the standby power is greatly reduced. If the user wants to cook again, the door may be opened and the above-described operation from time point b to time point i may be repeated.

At time h, when the cancel key 18 is pressed with the door closed, the control unit 10 enters a standby state. A predetermined time (for example, 1
If the control unit 10 determines that there is no input from the other keys 19 within 0 minutes), the control unit 10 opens the switch 7 a predetermined time after the cancel key 18 is pressed (time i). Thus, the primary side 9 and the control unit 10 are de-energized, the power consumption of the cooking appliance 1 becomes zero, and the standby power is greatly reduced.

If the cancel key 18 is pressed during cooking (for example, at time j in FIG. 2), the control unit 10 causes the fourth drive unit 2 to operate.
Then, the third relay 34 and the like are opened. As a result, power supply to the magnetron 39 and the like is stopped, and cooking is stopped. If there is no other key 19 input within a predetermined time after the cancel key 18 is pressed, the control unit 10 opens the switch 7 after a predetermined time has elapsed, and stops supplying power to the primary side 9.

[0025]

According to the first aspect of the present invention, when the door is opened and the door switch is closed, and when the door is closed and the door switch is opened, the control unit enters a standby state. Then, a predetermined time after the door is closed, the control unit opens the switch,
Stop supplying power to the primary side of the transformer. As a result, in the subsequent period, the power consumption of the cooker becomes zero, and the standby power is greatly reduced.

As described above, in the normal operation in which cooking is completed, the user opens the door, and then closes the door, the above-described operation of reducing the standby power is automatically performed. Since no operation (for example, pressing a key) is required, convenience is improved. When the door is opened, the door switch is closed, the primary side is energized, and the control unit is also energized, so that normal control can be performed and cooking can be performed.

According to a second aspect of the present invention, when the cancel key is pressed while the door is closed and the door switch is open,
After a predetermined time, the control unit opens the switch. As a result, even when the door is closed, when the user presses the cancel key, power supply to the primary side of the transformer is stopped after a predetermined time. Therefore, standby power can be reduced.

According to the third aspect of the present invention, when another key connected to the control unit is input within a predetermined time after the door is closed, the control unit keeps closing the switch. Thus, after the door is closed (or after the cancel key is pressed)
The other keys are input within the predetermined time when the user clearly wants to cook. At that time, the switch is kept closed, the primary side and the control unit are kept energized, and can be cooked at any time, so that usability is improved.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a cooker according to an embodiment of the present invention.

FIG. 2 is a time chart of a control unit used in the cooking device.

[Explanation of symbols]

 6 Door switch 7 Switch 8 Transformer 9 Primary side 10 Control unit 12 Secondary side

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiya Nishimoto 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd.

Claims (3)

[Claims] A door switch for a door, a switch, a primary side of a transformer connected in series with a parallel circuit of the two switches, and a control unit connected to a secondary side of the transformer, The door is opened, the door switch is closed, and the energized control unit closes the switch and keeps energized, and a predetermined time after the door is closed and the door switch is opened,
The cooker, wherein the control unit opens the switch. 2. A door switch for a door, a switch, a primary side of a transformer connected in series with a parallel circuit of the two switches, a control unit connected to a secondary side of the transformer, and the control unit. A cancel key connected to the cooking device, wherein when the door is closed and the door switch is open, when the cancel key is pressed, after a predetermined time, the control unit opens the switch. vessel. 3. The cooker according to claim 1, wherein when another key connected to the control unit is input within the predetermined time, the control unit closes the switch. .