JP2014001888A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow control means to operate after recovery from power failure even when cooking is interrupted by power failure.SOLUTION: A heating cooker comprises: a heating chamber 2 into which an object to be cooked is put; a door 3 which enables the object to be cooked 1 to be put into/taken out of the heating chamber 2; a load 607 which becomes a heat source for heating the object to be cooked 1 placed in the heating chamber 2; control means 9 which controls the load 607; a door switch 605 which performs electric power supply from a commercial power source to the control means 9 in conjunction with the opening of the door 3; power source holding means 603 which turns ON/OFF the electric power supply from the commercial power source to the control means 9 by the control of the control means 9; power failure detection means 608 which detects the power failure of the commercial power source; and power source backup means 602 which supplies the control means 9 with electric power when power failure is detected by the power failure detection means 608. For the power source holding means 603, a latch type relay is used.

Description

  The present invention relates to a heating cooker.

  Conventionally, in order to save energy, power consumption during standby when an original function is not operating has been reduced.

  Therefore, as shown in Patent Document 1, a switch for turning the contact ON / OFF in conjunction with opening / closing of the door is provided, and when the door is opened, the switch is turned ON to supply power to the control circuit, and supply of power In response to this, the control circuit turns on the contact of the relay provided in parallel between the contacts of the switch to ensure the supply of power without being affected by the opening and closing of the door, and turns off the contact of the relay when unnecessary. Some of them cut off the supplied power.

JP 7-217906 A

  However, in the above prior art, when a power failure occurs, power supply to the control circuit is cut off, so cooking is stopped when cooking is in progress, cooking ingredients are wasted, and cooking is started from the beginning. I need to start over. In addition, there is a problem that the user does not know the reason for the cancellation. Furthermore, regarding a relay provided in parallel between the contacts of a switch that turns the contact ON / OFF in conjunction with the opening and closing of the door, if power supply to the relay coil is always required while the contact of the relay is ON, a power failure After the restoration, there is a problem that power cannot be supplied to the control circuit unless the door is opened.

  The present invention has been made in order to solve the above-described problem, and includes a heating chamber in which an object is to be cooked, a door that allows the object to be taken in and out of the heating chamber, and the object in the heating chamber. A load serving as a heating source for heating the food; a control means for controlling the load; a door switch for supplying electric power from a commercial power source to the control means in conjunction with opening of the door; and control of the control means Power supply holding means for turning on / off the supply of power from the commercial power source to the control means, a power failure detection means for detecting a power failure of the commercial power source, and power to the control means when the power failure is detected by the power failure detection means Power supply backup means for supplying power, and the power holding means uses a latch-type relay.

  In addition, when it is determined that cooking is not continued after the power failure is restored, the power holding unit is turned off and the standby power is zero.

  Furthermore, when it is determined that cooking is not continued after the power failure is restored, the user is notified with a cooking stop display.

  According to the present invention, even when cooking is interrupted by a power failure, the control means can operate after the power failure is restored.

The perspective view of the microwave oven of one Example. The side view of the microwave oven of one Example. The flowchart figure explaining a power failure and a power failure reset operation | movement during cooking of the microwave oven of one Example. The block diagram which shows the schematic control circuit structure of the microwave oven of one Example. The circuit diagram explaining the power supply of the microwave oven of one Example. The circuit diagram explaining the power supply of the microwave oven of one Example.

  Hereinafter, one Example of the heating cooker of this invention is described with reference to the microwave oven shown to FIGS. 1-2, FIG.

  As shown in FIGS. 1 and 2, the microwave oven of the present embodiment includes a heating chamber 2 that houses a cooking object 1 such as food to be cooked, and a cooking object 1 provided in front of the heating chamber 2. A door 3 that can be freely opened and closed and a non-rotating table 4 on which the cooking object 1 provided on the bottom surface of the heating chamber 2 is placed are provided. This configuration is a so-called turntableless type.

  Moreover, the weight sensor 5a, 5b, 5c which supports the table 4 is provided, and cooking time can be determined according to the weight of the to-be-cooked object 1 detected by this weight sensor 5a, 5b, 5c.

  Temperature sensors such as a temperature sensor 40 and an infrared sensor (not shown) are provided in the heating chamber 2, and cooking output, cooking time, and the like can be determined according to the temperature detected by the temperature sensor.

  Moreover, the window part 23 formed large is provided in the center part of the door 3, and the inside of the heating chamber 2 during cooking can be seen. Further, an operation display unit 6 is provided below the door 3. Reference numeral 25 denotes a cover that covers both side surfaces and the upper surface of the microwave oven.

  And the microwave oven of a present Example can perform various cooking by performing three types of cooking methods of microwave oven cooking, oven cooking, and steam cooking individually or in combination. Furthermore, a bakery tool (not shown) may be installed in the heating chamber 2, and the powder may be baked from fermentation by a bakery function. The cooking method is not particularly limited to these, and for example, a cooking method such as cooking with superheated steam or grill cooking may be included.

  Microwave cooking is a cooking method in which microwaves are applied to the cooking object 1 placed on the table 4 and the cooking object 1 is actively heated by molecular / atomic vibrations such as moisture in the cooking object 1. . In order to perform microwave cooking, the microwave oven of the present embodiment includes a magnetron 7 that oscillates a microwave that is a heating source for microwave cooking, and an inverter board 8 that controls the output of the microwave oscillated from the magnetron 7. Yes. The inverter board 8 is controlled by the control means 9 and can apply a desired amount of microwaves to the object 1 to be heated in the microwave oven.

  A waveguide 10 that guides the microwave oscillated from the magnetron 7 to the heating chamber 2, a rotating antenna 11 that irradiates the heating chamber 2 while stirring the microwave, and an antenna motor 12 that rotates the rotating antenna 11. In order to prevent the microwave from concentrating on a part, the control means 9 controls the antenna motor 12 to rotate the rotating antenna 11 to perform a desired stirring operation.

  Next, oven cooking will be described. Oven cooking is a heating method in which the object to be cooked 1 placed on the table 4 is given radiant heat (far infrared rays) through the wall surface of the heating chamber 2 to heat the object to be cooked 1 from the inside. A feature of this oven cooking is that the cooking object 1 can be cooked while maintaining the constant temperature relatively easily.

  In order to perform oven cooking, an electric heater 14 is provided outside the upper wall surface of the heating chamber 2. This electric heater 14 is controlled by the control means 9, and by heating the upper wall surface of the heating chamber 2 to an appropriate temperature, a desired amount of radiant heat (far infrared rays) is given to the cooking object 1 to perform oven cooking. In addition, a hot air can also be given to the to-be-cooked object 1 at the time of oven cooking, For this reason, the hot air unit 15 is provided in the back wall of the heating chamber 2. FIG.

  Next, steam cooking will be described. Steam cooking is a cooking method in which steam is applied to the cooking object 1 placed on the table 4, the cooking object 1 is covered with a water film, and the cooking object 1 is heated. The feature of this steam cooking is that it can be steamed and cooked while covered with a film of water, so it suppresses the combination of oxygen in the air and ingredients (oxidation of the food 1) and moisture in the food 1 It is possible to maintain the flavor of the object to be cooked 1 while suppressing the loss of the food, and further to fill the heating chamber 2 with steam to push out air and cook in a low oxygen state.

  In order to perform steam cooking, a water supply means 19 for supplying water under the heating chamber 2 is provided, and a steam generation means 20 for generating steam by heating the water supplied from the water supply means 19 to the heating chamber side surface 2c. I have. The water supply means 19 and the steam generation means 20 are controlled by the control means 9, and steam to be cooked 1 can be cooked by supplying steam at a desired temperature to the heating chamber 2.

  Next, the operation display unit 6 provided on the lower side of the door 3 will be described. The operation display unit 6 displays the cooking method of manual cooking displayed on the LCD display 604 (FIG. 4), the cooking output setting, the cooking temperature setting, the cooking time setting, the cooking finish setting, the presence / absence setting of the oven cooking preheating, and the like. Select and press the start key (not shown) to start the operation. The LCD display 604 displays the usage amount of ingredients and seasonings necessary for cooking, and the user prepares for cooking according to the displayed contents. The auto cooking menu is a menu that is automatically cooked by the detection inputs of the weight sensors 5a, 5b, 5c and the temperature sensor 40 and the control of the microcomputer 21 (FIG. 4). Cooking output, cooking time, temperature, quantity, etc. There is no need to set.

  Next, a schematic circuit configuration will be described with reference to FIG. 4, FIG. 5-1, and FIG. In FIGS. 5A and 5B, a power supply circuit 606 supplies power to the control means 9 such as the microcomputer 21. As shown in FIG. 4, the input terminal of the microcomputer 21 includes a power failure detection means 608 for detecting a power failure and a power backup means 602 (battery, power supply) for supplying power to the control means 9 instead of the power circuit 606 after the power failure. Capacitor etc.). The output terminal of the microcomputer 21 is connected to the magnetron 7, the electric heaters 14 and 17, and the steam generating means 20 through the inverter board 8 as a load.

  Further, as shown in FIGS. 5A and 5B, the power supply holding unit 603 that holds the supply of power is connected to the power supply circuit 606.

  Reference numeral 605 denotes a door switch which opens and closes as the door 3 opens and closes. When the door 3 is closed, the contact 605c and the contact 605a are connected and a circuit that can supply power to the load 607 (inverter board 8, magnetron 7, electric heaters 14, 17, steam generating means 20, antenna motor 12, etc.) Configure. When the door 3 is open, the contact 605c is connected to the contact 605b and constitutes a circuit that can supply power to the power supply circuit 606 that supplies power to the control means 9.

  The power holding unit 603 is connected in parallel between the contact 605c and the contact 605b of the door switch 605, and supplies power to the power circuit 606 without being affected by the opening and closing of the door 3 by turning on the power holding unit 603. it can. The power holding means 603 is a type that uses a latch-type relay and does not require electric power to hold the contact ON or OFF state.

  The relays 9 a and 9 b are power control means provided in the control means 9 for turning on / off the supply of power to the load 607.

  FIG. 5A shows a state where the door 3 is closed. Since the contact of the door switch 605 is connected to the contact 605c and the contact 605a, and the contact state of the power holding means 603 is OFF, power is not supplied to the control means 9. Therefore, standby power is zero.

  FIG. 5B shows a state where the door 3 is opened. When the door 3 is opened, the contact 605c and the contact 605b are connected to the contact of the door switch 605. When power is supplied to the power supply circuit 606, the microcomputer 21 of the control means 9 activates the power supply holding means 603 to turn on the contact. When the contact of the power holding means 603 is turned on, power can be supplied to the power supply circuit 606 without being affected by the contact state of the door switch 605.

  FIG. 5-1 (c) shows a state in which the door 3 is closed, in which the relay 9a and the relay 9b, which are power control means, are closed to supply power to the load 607 and heat it.

  FIG. 5-1 (d) shows a state where a power failure has occurred during the heating described above. When the power failure detection means 608 detects a power failure, the relay 9a and the relay 9b, which are power control means, are opened to shut off the circuit connected to the load 607 so as not to waste the power of the power backup means 602. The power holding means 603 can hold the contact state without using power by using a latch relay. By holding the power, power can be supplied to the power supply circuit 606 even when the door 3 is closed after the power failure is restored. And the microcomputer 21 at the time of a power failure is performing the memory | storage of the state before a power failure, and the time measurement of the power failure.

  FIG. 5-2 (e) shows a state where the power failure has been restored. Since the contact of the power holding means 603 is closed, power is supplied to the power supply circuit.

  FIG. 5-2 (f) shows a state in which heating is resumed as a result of judging the time and cooking mode in which power was lost after the restoration of the power failure under the conditions described later. A state in which the relays 9a and 9b, which are power control means, are closed to supply power to the load 607 is shown.

  FIG. 5-2 (g) shows a state when reheating is not possible as a result of a judgment based on conditions depending on the time when the power failure occurred and the progress (step) state of the cooking mode when the power failure was restored.

  Since the reheating load is determined, the control means 9 stores the characters “warning” such as a non-volatile memory in advance so that the LCD display 604 of the operation panel can be informed of the stop of cooking when re-energized. Open and stop.

  Next, the operation during cooking will be described with reference to FIG.

  Step a is a step of confirming whether cooking or waiting. If cooking, proceed to the next step b.

  In step b, the progress (step) state of the cooking mode in the case of consisting of cooking modes such as oven cooking and grill cooking and a plurality of cooking modes, the heating power, and the set time of cooking are recorded.

  In step c, cooking proceeds while recording the elapsed time.

  Step d is a step for monitoring the occurrence of a power failure during cooking. When the power failure detection means 608 detects a power failure, the process proceeds to the next step e, where the power backup means 602 continues the operation of the microcomputer 21 and starts measuring the power failure time until the power failure is restored.

  Step e is a step for monitoring recovery from power failure. When the power failure detection means 608 detects recovery from the power failure, the process proceeds to the next step f.

  In step f, the measurement of the power failure time is stopped and the power failure time is determined.

  In step g, it is a step of confirming whether the power failure has just recovered. In the case immediately after the power failure is restored, the process proceeds to the next step h.

  In step h, conditions are determined based on the progress (step) state of cooking until the power failure and the power failure time, and it is determined whether cooking is continued after the power failure is restored or cooking is terminated. The conditions will be described later.

  When cooking is continued, the process proceeds to the next step i, where a reheating time is set and heating is started.

  When the cooking is terminated and terminated, the process proceeds to the next step j, a power failure is encountered during cooking, and for example, a “warning” indicating that the cooking is suspended is stored, and the reheating is stopped. Thereafter, when the control means 9 is activated for the first time, the “warning” stored in the LCD display 604 (or the LED display 24) is displayed to indicate that there has been a power failure of the user.

  Next, the conditions will be described.

  The condition is a criterion for determining whether cooking is continued or interrupted after restoration from a power failure.

  As for the condition to continue cooking, in a microwave oven with a bakery function, as a matter of course, even in the case of timer reservation, if it is within the timer time, the timer reservation will be continued after the power failure is resumed or the bakery if it is the start time Activate the function. In the bakery operation, there are modes for stirring the water from the flour into the dough, during fermentation, degassing, and baking, and control that completes the bakery even after a power outage and recovery from a power outage over a long period of time. I will provide a.

  The condition for stopping cooking is determined when the power outage time is longer than a certain time or from the step value of the cooking mode.

  In addition, in the timer reservation for the bakery function, the user made a timer reservation with settings including finishing so that the user burns it at 8:00, for example, at 6:00 in the morning of the following day. When the dish is temporarily warmed, a button having an interrupt button function is provided on the operation display unit 6, and when the interrupt button is pressed, the previously set bakery setting state is stored, and the microwave function, the oven function, etc. are heated. Can be selected. When warming and cooking are completed, the interrupt button is pressed again to call up the setting of the bakery function, return to timer reservation, and continue the operation.

  According to the above-described embodiment, even when cooking is interrupted by a power failure, the control means 9 can operate after the power failure is restored.

DESCRIPTION OF SYMBOLS 1 Cooking object 2 Heating chamber 9 Control means 601 Cancel key 602 Power backup means 603 Power supply holding means 604 LCD display 605 Door switch 607 Load 608 Power failure detection means

Claims (3)

A heating chamber for cooking objects;
A door that allows the food to be taken in and out of the heating chamber;
A load serving as a heating source for heating the cooking object placed in the heating chamber;
Control means for controlling the load;
A door switch for supplying electric power from a commercial power source to the control means in conjunction with the opening of the door;
Power holding means for turning on / off the supply of power from a commercial power source to the control means under the control of the control means;
A power failure detection means for detecting a power failure of the commercial power supply;
Power supply backup means for supplying power to the control means when a power failure is detected by the power failure detection means,
A heating cooker characterized in that a latch-type relay is used for the power holding means.   2. The cooking device according to claim 1, wherein when it is determined that cooking is not continued after restoration from a power failure, the power holding unit is turned off to reduce standby power to zero.   The cooking device according to claim 2, wherein when the cooking is determined not to be continued after the power failure is restored, the user is notified of the cooking stop display.