JP2008071519A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve capacity shortage of a power switch 21 without using a high-capacity power switch. <P>SOLUTION: Commercial A.C. power is supplied to a left IH inverter circuit 25 by a power feed path 28 routed through the power switch 21; the commercial A.C. power is supplied to an upper heater 13 by a power feed path 67 without being routed through the power switch 21; and the commercial A.C. power is supplied to a lower heater 14 by a power feed path 68 without being routed through the power switch 21. Thereby, since a left IH coil 6 can be driven without lowering the output of the left IH coil 6 during simultaneous current carrying to the upper heater 13 and the lower heater 14, the capacity shortage of the power switch 21 can be solved without using a high-capacity power switch. In addition, since a state detection circuit 41 generates a detection signal bringing a heating permission circuit 40 into a forbidding state when the power switch 21 is operated from a turn-on state to a turn-off state, heating cooking can be stopped by operating the power switch 21 from the turn-on state to the turn-off state by a user when the heating cooking is not stopped based on runaway of a sub-control circuit 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooking device including a plurality of heating sources for cooking cooked food.

  FIG. 4 shows a conventional configuration of an IH cooking heater which is an example of the heating cooker. The power switch 100 has an operation element, a left switch 101, and a right switch 102. When the user operates the operation element from the cut-off state to the on-state, the left switch 101 and the right switch 102 are turned on. When the operation element is operated from the off state to the on state, AC power is supplied to the power supply circuit 104 based on the main AC relay 103 changing from the off state to the on state, and the power supply circuit 104 supplies the drive power to the control circuit 105. Vcc is given. Then, the control circuit 105 is activated and the drive power supply Vcc is secured based on turning on the DC relay 107 via the relay drive circuit 106.

  The heater 108 conducts and heats the upper cooking utensil, the upper heater 109 radiates and heats the food in the roaster room from above, and the lower heater 110 radiates and heats the food in the roaster room from below. The heater 108 is supplied with AC drive power through the left switch 101 when the DC relay 111 is turned on, and the upper heater 109 is supplied with AC power through the left switch 101 when the DC relay 112 is turned on. Drive power is supplied, and the lower heater 110 is supplied with AC drive power through the left switch 101 when the DC relay 113 is turned on. Each of these DC relays 111 to 113 is connected to the control circuit 105 via a relay drive circuit 114, and the control circuit 105 controls each of the DC relay 111 to DC relay 113 via the relay drive circuit 114. Based on this, each of the heater 108 to the lower heater 110 is caused to generate heat.

Each of the left IH coil 115 and the right IH coil 116 heats the upper cooking utensil, the left IH coil 115 is connected to the left IH inverter circuit 117, and the right IH coil 116 is connected to the right IH inverter circuit 118. Is connected. Each of the left IH inverter circuit 117 and the right IH inverter circuit 118 converts AC power into high frequency power. The left IH inverter circuit 117 is supplied with AC power through the left switch 101 and is supplied to the right IH inverter circuit 118. Is supplied with AC power through the right switch 102. Each of the left IH inverter circuit 117 and the right IH inverter circuit 118 is connected to the control circuit 105. The control circuit 105 oscillates the left IH coil 115 based on driving control of the left IH inverter circuit 117, and The right IH coil 116 is oscillated based on driving control of the IH inverter circuit 118.
JP 2003-59633 A

  In the case of the IH cooking heater of FIG. 4, AC power is supplied to the heater 108, the upper heater 109, the lower heater 110, and the left IH inverter circuit 117 through the common left switch 101, so the capacity of the left switch 101 is insufficient. There is a tendency. When the capacity of the left switch 101 is increased, the outer shape of the power switch 100 increases. For this reason, since the freedom degree of arrangement | positioning of the power switch 100 becomes small and cost becomes high, raising the capacity | capacitance of the left switch 101 is actually difficult.

  For example, in order to cook a cooked food in a short time, the energization is performed simultaneously instead of the alternate energization method (alternate energization of input current “6A” and output “1200 W”) in which both the upper heater 109 and the lower heater 110 are energized alternately. It is preferable to adopt the simultaneous energization method (simultaneous energization of input current “12 A” and output “2400 W”). However, when the left IH coil 115 is driven while the upper heater 109 and the lower heater 110 are energized simultaneously, the capacity of the left switch 101 is insufficient, so the output of the left IH coil 115 must be reduced. It is not obtained (for example, 2.8 kW to 1.6 kW), and the user's usability is reduced.

  This invention is made | formed in view of the said situation, The objective is to provide the heating cooker which can eliminate lack of capacity | capacitance of a power switch, without using a high capacity | capacitance power switch.

  The cooking device according to each of claims 1 to 4, wherein the cooking device is interposed between a first heating source for cooking cooked food and a power supply path for supplying power to the first heating source. A power switch that allows a user to switch between a power-on state that closes the power supply path and a power-off state that opens the power supply path; Enters a second heating source that is supplied through another power supply path that does not go through the power switch, a control circuit that drives and controls each of the first heating source and the second heating source, and the power switch enters A state detection circuit for detecting whether the power supply switch is on or not, and allowing the control circuit to drive the second heating source when the state detection circuit detects the on state of the power switch. And said When state detector is detecting the disengaged condition of the power switch is characterized in place with a heated permission circuit for prohibiting that said control circuit drives said second heating source.

  The heating cooker according to claim 5 is interposed in a coil for heating the cooking utensil, an inverter circuit for converting commercial AC power to drive power for the coil, and a power supply path for supplying commercial AC power to the inverter circuit. A power switch that can be operated by the user between the on state and the open state of closing the power supply path of the inverter circuit, and heating the food in a manner different from that of the coil A heat source in which a commercial AC power supply is supplied through another power supply path that does not go through the power switch, and another power supply path that supplies a commercial AC power supply to the heat source. The heat source switch that can be switched between the ON state that closes the power supply path and the OFF state that opens, and the commercial AC power source are converted into DC power sources. A power supply circuit that is supplied through the main power supply path and the sub power supply path, and a power supply circuit that is interposed in the main power supply path and that is supplied with commercial AC power through the power switch when the power switch is turned on. A main switch that is turned on to close the main power supply path and is turned off based on the fact that the commercial AC power is cut off when the power switch is turned off, and the sub power supply path And a sub switch that is switched between an ON state for closing the sub power feed path and an OFF state for opening the sub power feed path, and the main switch is turned on when the power switch is turned on. A sub-switch that turns on the sub switch while being supplied with a DC driving power from the power circuit based on the state The operation signal is output to the sub switch, and when the operation command is received, the inverter drive signal for driving and controlling the inverter circuit and the heat source drive signal for driving and controlling the heat source switch are each received as a result of the operation command. A control circuit that outputs in response to the control circuit, a permission state in which the heat source drive signal output from the control circuit is provided to the heat source switch, and a prohibition state in which the heat source drive signal output from the control circuit is not provided to the heat source switch. A detection signal is generated based on a heating permission circuit that is switched between and a DC power source that is converted by the power source circuit. Based on the fact that commercial AC power is supplied through the power switch when the power switch is on. A detection signal for enabling the heating permission circuit is generated, and commercial AC power is generated when the power switch is turned off. It is characterized in that a state detection circuit is provided that generates a detection signal that disables the heating permission circuit based on the fact that the source is shut off.

[About the heating cooker according to each of claims 1 to 4]
Power is supplied to the first heating source through a power supply path that passes through the power switch, and power is supplied to the second heating source through another power supply path that does not pass through the power switch. This makes it possible to drive the first heating source with a large output without reducing the output of the first heating source during the driving of the second heating source. This can be solved without using a power switch.

When the control circuit goes out of control while driving the second heating source, the second heating source is continuously operated, and cooking is performed against the user's intention. When the user switches the power switch from the on state to the off state during the runaway of the control circuit, the state detection circuit detects that the power switch has been operated to the off state, and the control circuit drives the second heating source. The heating permission circuit prohibits this. For this reason, it can prevent that a cooking progresses due to runaway of a control circuit based on a user operating a power switch.
[About the heating cooker according to claim 5]
When the user operates the power switch from the off state to the on state, the main power relay is turned on based on the supply of commercial AC power to the main power relay. Then, commercial AC power is supplied to the power circuit through each of the power switch and the main power relay, and the control circuit is activated based on the DC power supplied from the power circuit to the control circuit, and the control circuit turns on the sub power relay. It becomes a self-holding state based on the state. In the on state of the power switch, the state detection circuit generates a detection signal for allowing the heating permission circuit. This detection signal is generated based on the DC power supply from the power supply circuit. When the control circuit outputs the heat source drive signal in the permission state of the heating permission circuit, the heat source switch is driven and controlled according to the heat source drive signal. Accordingly, when the heat source generates heat and the control circuit outputs the inverter drive signal in the permission state of the heating permission circuit, the coil oscillates based on the drive control of the inverter circuit according to the inverter drive signal. In this case, commercial AC power is supplied to the inverter circuit through a power supply path that passes through the power switch, and commercial AC power is supplied to the heat source through another power supply path that does not go through the power switch. For this reason, since it becomes possible to drive the heat source with a large output without reducing the output of the coil during the oscillation of the coil, the shortage of the capacity of the power switch can be solved without using a high capacity power switch. .

  When the control circuit goes out of control while driving the heat source, the heat source is continuously operated, and cooking is performed against the user's intention. When the user operates the power switch from the on state to the off state during the runaway of the control circuit, the state detection circuit generates a detection signal for prohibiting the heating permission circuit. This detection signal is generated based on the DC power supply from the power supply circuit, and the heat source drive signal output from the control circuit is not given to the heat source switch when the heating permission circuit is prohibited. For this reason, since the heat source stops driving, it is possible to prevent the cooking from proceeding due to the runaway of the control circuit based on the user operating the power switch.

[Example 1]
As shown in FIG. 1, a cabinet 1 is housed inside the system kitchen. The cabinet 1 has a rectangular box shape in which an upper surface and a front surface are opened, and a top plate 2 made of heat-resistant glass is joined to the cabinet 1. The top plate 2 closes the upper surface of the cabinet 1 and is exposed on the upper surface of the system kitchen. A left mark 3, a right mark 4, and a middle mark 5 are printed on the top plate 2, and a left IH coil 6 (see FIG. 2) is stored in the cabinet 1 so as to be located immediately below the left mark 3. The right IH coil 7 (see FIG. 2) is housed immediately below the right mark 4, and the middle heater 8 (see FIG. 2) is housed just below the middle mark 5.

  Each of the left mark 3 and the right mark 4 serves as a mark when placing a cooking utensil for induction heating on the upper surface of the top plate 2, and the cooking utensil placed on the left mark 3 has a high frequency by the left IH coil 6. The cooking utensil placed on the right mark 4 is induction-heated based on the oscillation, and the cooking device placed on the right mark 4 is induction-heated based on the high-frequency oscillation of the right IH coil 7. The middle mark 5 serves as a mark when a cooking utensil for conductive heating is placed on the upper surface of the top plate 2. The cooking utensil placed on the middle mark 5 is conductively heated based on the fact that the middle heater 8 generates heat. Is done. Among these, the heater 8 corresponds to each of the second heating source, the heater, and the heat source, and the left IH coil 6 corresponds to each of the first heating source and the coil.

  As shown in FIG. 1, a left thermal power mark 9 is printed on the top plate 2 in front of the left mark 3, and a right thermal power mark 10 is printed in front of the right mark 4. A plurality of LEDs are housed in the interior of 1 at positions just below the left thermal power mark 9 and right below the right thermal power mark 10. Each of the left thermal power mark 9 and the right thermal power mark 10 is illuminated on the basis that the lower LED is lit, and the output of the left IH coil 6 is given to the user according to the illumination state of the left thermal power mark 9. The output of the right IH coil 7 is notified to the user according to the illumination state of the right heating power mark 10. As shown in FIG. 1, a caution mark 11 is printed on the top plate 2 in front of the middle mark 5, and an LED is housed inside the cabinet 1 below the caution mark 11. ing. This caution mark 11 is illuminated based on the fact that the lower LED is lit. When the middle heater 8 generates heat, the caution mark 11 is illuminated and the user is informed that the top plate 2 is hot. Is notified.

  As shown in FIG. 1, the cabinet 1 is provided with a door 12, and the door 12 can be operated between a closed state in which the front surface of the roaster chamber is closed and an open state in which the front surface of the roaster chamber is opened. Yes. The roaster chamber is formed inside the cabinet 1, and an upper heater 13 (see FIG. 2) and a lower heater 14 (see FIG. 2) are accommodated in the roaster chamber. The upper heater 13 irradiates the food stored in the roaster chamber with radiant heat from above, and the lower heater 14 irradiates the food stored in the roaster chamber with radiation heat from below. The food stored in the roaster chamber is double-sided from both the upper and lower directions based on the fact that both the upper heater 13 and the lower heater 14 generate heat simultaneously. The lower heater 14 corresponds to each of the second heating source, the heater, and the heat source, and the upper heater 13 corresponds to each of the second heating source, the heater, and the heat source.

  A fan motor is accommodated in the cabinet 1. A fan is connected to the rotation shaft of the fan motor, and outside air is sucked into the cabinet 1 from the air inlet 15 when the fan motor is driven. As shown in FIG. 1, the air intake 15 is formed in the cabinet 1 behind the right mark 4, and the air sucked into the cabinet 1 from the air intake 15 is inside the cabinet 1. And then discharged to the outside of the cabinet 1 from the exhaust port 16. The exhaust port 16 is formed in the cabinet 1 so as to be located behind the left mark 3, and electronic components housed in the cabinet 1 are cooled by outside air flowing inside the cabinet 1.

  As shown in FIG. 1, an operation panel 17 is joined to the cabinet 1 on the right side of the door 12. The operation panel 17 closes the right side of the door 12 in the front surface of the cabinet 1 and is exposed on the front surface of the system kitchen. A plurality of switches 18 are attached to the operation panel 17. Each of the plurality of switches 18 is operated by the user from the front, and is connected to a main control circuit 19 mainly composed of a microcomputer as shown in FIG. The main control circuit 19 has a CPU, a ROM, and a RAM, and sets an operation command according to the operation contents of the plurality of switches 18. The main control circuit 19 is connected to the sub control circuit 20, and the main control circuit 19 transmits an operation command setting result to the sub control circuit 20. The sub-control circuit 20 is mainly composed of a microcomputer and has a CPU, a ROM and a RAM. The sub-control circuit 20 performs bi-directional serial communication with the main control circuit 19, and sets each of a plurality of types of drive signals according to the reception result of the operation command. The sub control circuit 20 corresponds to a control circuit.

  A thermistor is connected to the sub control circuit 20. This thermistor is disposed in contact with the top plate 2, and the sub-control circuit 20 detects the surface temperature of the top plate 2 based on the temperature signal output from the thermistor. The sub-control circuit 20 is connected with an LED below the caution mark 11, and the sub-control circuit 20 performs cooking using either the left IH coil 6, the right IH coil 7, or the heater 8. During this time, the temperature signal output from the thermistor is compared with a reference value recorded in advance in the ROM, and when it is determined that the detection result of the temperature signal is greater than or equal to the reference value, the LED below the caution mark 11 is turned on. Based on this, the attention mark 11 is illuminated.

  As shown in FIG. 1, an operation element 22 of a power switch 21 is attached to the operation panel 17 so that it can be operated by a user in front. The power switch 21 is a seesaw type having a capacity of 20 A, and has a left switch 23 and a right switch 24 as shown in FIG. The operating element 22 of the power switch 21 is mechanically self-held in the on state and the off state, and the left switch 23 and the right switch 24 are electrically off when the operating element 22 is off. And is kept in an electrically on state when the operating element 22 is in the on state.

  As shown in FIG. 2, a left IH inverter circuit 25 and a right IH inverter circuit 26 are housed inside the cabinet 1. The left IH inverter circuit 25 generates drive power for causing the left IH coil 6 to oscillate at high frequency based on commercial AC power, and corresponds to an inverter circuit. This left IH inverter circuit 25 is connected to a single-phase 200V commercial AC power supply via a left switch 23 and a noise filter circuit 27. When the operation element 22 of the power switch 21 is turned on, the left IH inverter circuit is connected. The power supply path 28 of the circuit 25 is closed. This power supply path 28 is for supplying commercial AC power to the left IH inverter circuit 25 through each of the noise filter circuit 27 and the left switch 23, and is opened when the operating element 22 of the power switch 21 is operated to be turned off. Is done.

  The right IH inverter circuit 26 generates a drive power source for causing the right IH coil 7 to oscillate at a high frequency based on a commercial AC power source. This right IH inverter circuit 26 is connected to a single-phase 200V commercial AC power supply via a right switch 24 and a noise filter circuit 27. When the operator 22 of the power switch 21 is turned on, the right IH inverter circuit is connected. The power supply path 29 of the circuit 26 is closed. This power supply path 29 is for supplying commercial AC power to the right IH inverter circuit 26 through each of the noise filter circuit 27 and the right switch 24, and is opened when the operation element 22 of the power switch 21 is turned off. Is done. That is, the left switch 23 of the power switch 21 is interposed in a power supply path 28 for supplying commercial AC power to the left IH inverter circuit 25, and the right switch 24 of the power switch 21 is connected to the right IH inverter circuit 26 with commercial AC. It is interposed in a power supply path 29 for supplying power.

  Each of the left IH inverter circuit 25 and the right IH inverter circuit 26 is connected to the sub-control circuit 20, and the sub-control circuit 20 controls the drive of the left IH inverter circuit 25 based on the IGBT drive signal, whereby the left IH coil 6 The right IH coil 7 is oscillated by controlling the right IH inverter circuit 26 based on the IGBT drive signal. Each of these IGBT drive signals is set by the sub-control circuit 20 in accordance with the reception result of the operation command from the main control circuit 19, and corresponds to an inverter drive signal. That is, each of the left IH coil 6 and the right IH coil 7 is supplied with power through a power switch 21, and the left switch 23 of the power switch 21 is interposed in a power supply path 28 for supplying high-frequency power to the left IH coil 6. The right switch 24 of the power switch 21 is interposed in a power supply path 29 for supplying high-frequency power to the right IH coil 7.

  As shown in FIG. 2, an operation control circuit 30 is housed inside the cabinet 1. This operation control circuit 30 controls the drive of each of the left IH coil 6, right IH coil 7, middle heater 8, upper heater 13 and lower heater 14, and includes a sub-control circuit 20, a power supply circuit 31, an AC relay 32, and the like. A DC relay 33, a relay drive circuit 34, a main DC relay 35, a sub DC relay 36, a sub DC relay 37, a sub DC relay 38, a relay drive circuit 39, a heating permission circuit 40, and a state detection circuit 41 are provided.

  The power supply circuit 31 converts a single-phase 200V commercial AC power supply into a DC drive power supply Vcc, and the left switch 23 is turned on when the operation switch 22 of the power switch 21 is operated from the off state to the on state. When this occurs, commercial AC power is supplied to the coil 51 of the AC relay 32 through the left switch 23, and the main power supply path 53 is closed based on the switching of the contact 52 of the AC relay 32 from the off state to the on state. The main power supply path 53 supplies commercial AC power to the power supply circuit 31, and the sub-control circuit 20 receives the drive power Vcc from the power supply circuit 31 based on the operation of the power switch 21 from the OFF state to the ON state. Given. When the operating element 22 of the power switch 21 is operated from the on state to the off state, the coil 51 of the AC relay 32 is disconnected from the commercial AC power source, and the contact 52 of the AC relay 32 is switched from the on state to the off state. Based on this, the main power feeding path 53 is opened. The AC relay 32 corresponds to a main switch.

  The relay drive circuit 34 mutually switches the DC relay 33 between an on state and an off state. The main control circuit 20 gives a relay drive signal to the relay drive circuit 34 immediately after startup, and the relay drive circuit 34 receives the relay drive signal. The DC relay 33 is turned on based on what is given. The DC relay 33 corresponds to a sub switch, and is interposed in the sub power feeding path 54. The sub power feed path 54 is parallel to the main power feed path 53, and commercial AC power is supplied to the power supply circuit 31 through the DC relay 33 when the DC relay 33 is in an on state.

  As shown in FIG. 3, the relay drive circuit 39 includes a main transistor 61 with resistance, a sub-transistor 62 with resistance, a sub-transistor 63 with resistance, and a sub-transistor 64 with resistance. Turns on the main transistor 61 on the basis of supplying the MAIN signal corresponding to the drive signal to the main transistor 61, and turns on the sub transistor 62 on the basis of supplying the C-HEATER signal corresponding to the drive signal to the sub transistor 62. The sub-transistor 63 is turned on based on giving a U-ROASTER signal corresponding to the drive signal to the sub-transistor 63, and the sub-transistor 64 is turned on based on giving the D-ROASTER signal corresponding to the drive signal to the sub-transistor 64. Turn on.

  The main DC relay 35 corresponds to a switch, and is interposed in a common power supply path 65 that supplies commercial AC power to each of the middle heater 8, the upper heater 13, and the lower heater 14, as shown in FIG. Yes. As shown in FIG. 3, the main DC relay 35 is turned off when the main transistor 61 is turned off. The main DC relay 35 is turned on when the drive power supply Vcc is supplied from the power supply circuit 31 when the main transistor 61 is turned on. It becomes a state.

  The sub DC relay 36 corresponds to each of a switch and a heat source switch, and is interposed in a power supply path 66 for supplying commercial AC power to the middle heater 8 alone as shown in FIG. As shown in FIG. 3, the sub-DC relay 36 is turned off when the sub-transistor 62 is turned off. It becomes a state. When the sub DC relay 36 is turned on together with the main DC relay 35, commercial AC power is supplied to the middle heater 8 via both the main DC relay 35 and the sub DC relay 36, and the middle heater 8 drives the commercial AC power. It generates heat as a power source. That is, the middle heater 8 is supplied with commercial AC power through a power feeding path 66 that does not go through the power switch 21, and the power feeding path 66 corresponds to another power feeding path.

  The sub DC relay 37 corresponds to each of a switch and a heat source switch, and is interposed in a power supply path 67 for supplying commercial AC power to the upper heater 13 alone as shown in FIG. As shown in FIG. 3, the sub DC relay 37 is turned off when the sub-transistor 63 is turned off. The sub-DC relay 37 is turned on when the drive power Vcc is supplied from the power supply circuit 31 when the sub-transistor 63 is turned on. It becomes a state. When the sub DC relay 37 is turned on together with the main DC relay 35, commercial AC power is supplied to the upper heater 13 through both the main DC relay 35 and the sub DC relay 37, and the upper heater 13 drives the commercial AC power. It generates heat as a power source. That is, the upper heater 13 is supplied with commercial AC power through a power supply path 67 that does not go through the power switch 21, and the power supply path 67 corresponds to another power supply path.

  The sub DC relay 38 corresponds to each of a switch and a heat source switch, and is interposed in a power supply path 68 for supplying commercial AC power to the lower heater 14 alone as shown in FIG. As shown in FIG. 3, the sub DC relay 38 is turned off when the sub-transistor 64 is turned off, and is turned on when the drive power supply Vcc is supplied from the power supply circuit 31 when the sub-transistor 64 is turned on. It becomes a state. When the sub DC relay 38 is turned on together with the main DC relay 35, commercial AC power is supplied to the lower heater 14 via both the main DC relay 35 and the sub DC relay 38, and the lower heater 14 drives the commercial AC power. It generates heat as a power source. That is, the lower heater 14 is supplied with commercial AC power through a power supply path 68 that does not go through the power switch 21, and the power supply path 68 corresponds to another power supply path.

  The state detection circuit 41 detects whether the power switch 21 is in the on state or the off state, and as shown in FIG. 3, a resistor 71, a bidirectional input type photocoupler 72, a capacitor 73, and a resistor 74 are provided. And a resistor 75. The photocoupler 72 is interposed in a power supply path 76 that supplies commercial AC power to the power supply circuit 31 through the left switch 23, and the resistor 71 suppresses an input current to the photocoupler 72. The photocoupler 72 is turned on when the power switch 21 is turned on and turned off when the power switch 21 is turned off. The capacitor 73, the resistor 74, and the resistor 75 are the power switch in which the photocoupler 72 is turned off. A high-level detection signal is generated based on the drive power supply Vcc in the cut-off state 21, and a low-level detection signal is generated in the on state of the power switch 21 in which the photocoupler 72 is turned on. The state detection circuit 41 is connected to the sub-control circuit 20, and the sub-control circuit 20 determines whether the power switch 21 is in the on state or the off state based on the detection signal from the state detection circuit 41.

  As shown in FIG. 3, the heating permission circuit 40 includes resistors 81 to 83, diodes 84 to 86, and a transistor 87 with a resistor, and the transistor 87 is connected to the state detection circuit 41. The transistor 87 is supplied with a high level detection signal from the state detection circuit 41 when the power switch 21 is turned off, and is supplied with a low level detection signal from the state detection circuit 41 when the power switch 21 is turned on. The circuit 41 turns on the transistor 87 when the power switch 21 is turned off and turns off the transistor 87 when the power switch 21 is turned on.

  The resistor 81 is interposed between the sub-control circuit 20 and the sub-transistor 62, and a diode 84 is connected to the resistor 81. The resistor 82 is interposed between the sub-control circuit 20 and the sub-transistor 63, and a diode 85 is connected to the resistor 82. The resistor 83 is interposed between the sub-control circuit 20 and the sub-transistor 64, and a diode 86 is connected to the resistor 83. Each of these diodes 84 to 86 is connected to the transistor 87, and when the sub control circuit 20 outputs the C-HEATER signal with the transistor 87 in the OFF state, the C-HEATER signal is supplied to the sub-transistor 62 through the resistor 81. The sub-transistor 62 is turned on, and when the sub-control circuit 20 outputs the C-HEATER signal while the transistor 87 is on, the C-HEATER signal is not supplied to the sub-transistor 62 and the sub-transistor 62 is turned off.

  When the sub-control circuit 20 outputs the U-ROASTER signal when the transistor 87 is off, the sub-transistor 63 is turned on based on the fact that the U-ROASTER signal is applied to the sub-transistor 63 through the resistor 82, and the transistor 87 is on. When the U-ROASTER signal is output, the U-ROASTER signal is not supplied to the sub-transistor 63 and the sub-transistor 63 is turned off. When the sub-control circuit 20 outputs the D-ROASTER signal when the transistor 87 is off, the sub-transistor 64 is turned on based on the fact that the D-ROASTER signal is applied to the sub-transistor 64 through the resistor 83, and the transistor 87 is on. When the D-ROASTER signal is output, the D-ROASTER signal is not supplied to the sub-transistor 64 and the sub-transistor 64 is turned off. That is, the heating permission circuit 40 allows the sub control circuit 20 to turn on each of the sub DC relay 36 to the sub DC relay 38 on the condition that the power switch 21 is operated to be turned on. The sub control circuit 20 is prohibited from turning on each of the sub DC relay 36 to the sub DC relay 38 on the condition that the sub control circuit 20 is operated in the cut-off state.

Next, the operation of the above configuration will be described.
When the user operates the operation element 22 of the power switch 21 from the off state to the on state, the AC relay 32 is turned on based on the fact that commercial AC power is supplied to the AC relay 32. Then, the commercial AC power is supplied to the power supply circuit 31 through the power switch 21 and the AC relay 32, and the sub control circuit 20 is activated based on the drive power Vcc being supplied from the power supply circuit 31 to the sub control circuit 20. The circuit 20 enters a self-holding state based on turning on the DC relay 33 immediately after activation. When the power switch 21 is turned on, a low level detection signal is output from the state detection circuit 40 to the transistor 87 of the heating permission circuit 41, and the sub control circuit 20 causes the middle heater 8 based on the heating permission circuit 40 being in the permission state. The upper heater 13 and the lower heater 14 are allowed to be driven.

  When the user operates one of the plurality of switches 18 with the power switch 21 turned on, the main control circuit 19 sets an operation command according to the operation content of each of the plurality of switches 18, and the sub control circuit 20 operates. Sends the command setting result. Then, the sub-control circuit 20 sets a drive signal based on the reception result of the operation command, and controls driving of any of the middle heater 8, the upper heater 13, and the lower heater 14 with the contents according to the setting result of the drive signal. Based on the above, the cooked food is cooked with the contents corresponding to the reception result of the operation command.

  For example, when the main control circuit 19 sets “double-sided roaster cooking” as an operation command, the sub-control circuit 20 outputs a MAIN signal, a U-ROASTER signal, and a D-ROASTER signal. Then, the main DC relay 35 is turned on when the MAIN signal is given from the sub control circuit 20 to the main transistor 61 of the relay drive circuit 39, and the sub transistor of the relay drive circuit 39 is passed from the sub control circuit 20 through the heating permission circuit 40. The sub-DC relay 37 is turned on based on the application of the U-ROASTER signal to 63, and the D-ROASTER signal is applied to the sub-transistor 64 of the relay drive circuit 39 from the sub control circuit 20 through the heating permission circuit 40. Then, the sub DC relay 38 is turned on, and both the upper heater 13 and the lower heater 14 generate heat simultaneously, and the cooked food in the roaster room is double-sided.

  When the main control circuit 19 sets “cooking stop” as an operation command during “double-sided roaster cooking”, the sub-control circuit 20 outputs the MAIN signal, the U-ROASTER signal, and the D-ROASTER signal, respectively. Is stopped, and each of the upper heater 13 and the lower heater 14 is turned off. The sub-control circuit 20 determines whether or not the power switch 21 has been operated from the on state to the off state based on the detection signal from the state detection circuit 41 when each of the upper heater 13 and the lower heater 14 is turned off. When it is determined that the switch 21 has been operated from the on state to the off state, the DC relay 33 is turned off.

  When the main control circuit 19 sets “stop cooking” as the operation command, but the sub control circuit 20 does not stop the output of the MAIN signal, the output of the U-ROASTER signal, and the output of the D-ROASTER signal, respectively. “Double-sided roaster cooking” proceeds against the user's intention. In this case, the user visually confirms the finished state of the food and switches the power switch 21 from the on state to the off state. Then, the detection signal output from the state detection circuit 41 to the transistor 87 of the heating permission circuit 40 is switched from the low level to the high level, and the transistor 87 of the heating permission circuit 40 is switched from the off state to the on state. When the transistor 87 is on, the MAIN signal output from the sub-control circuit 20 is not applied to the main transistor 61, and the U-ROASTER signal output from the sub-control circuit 20 is not applied to the sub-transistor 63. The D-ROASTER signal output from 20 is not applied to the sub-transistor 64. For this reason, since each of the upper heater 13 and the lower heater 14 is turned off, the roaster cooking of double-sided baking is stopped.

  When the main control circuit 19 sets “left IH cooking” as an operation command during execution of “double-sided roaster cooking”, the sub control circuit 20 outputs an IGBT drive signal to the left IH inverter circuit 25. Then, the commercial AC power is supplied to the left IH inverter circuit 25 through the left switch 23, and the left IH coil 6 oscillates based on the high frequency power supplied from the left IH inverter circuit 25 to the left IH coil 6, and the left mark 3 The upper cooking utensil is induction heated.

  When the main control circuit 19 sets “cooking stop” as an operation command during the simultaneous progress of “double-sided roaster cooking” and “left IH cooking”, the sub-control circuit 20 outputs the MAIN signal and the U-ROASTER signal. The output of the D-ROASTER signal and the output of the IGBT drive signal are stopped, and the left IH coil 6, the upper heater 13, and the lower heater 14 are turned off. The sub-control circuit 20 determines whether or not the power switch 21 is operated from the on state to the off state based on the detection signal from the state detection circuit 41 when each of the left IH coil 6, the upper heater 13 and the lower heater 14 is turned off. When it is determined that the power switch 21 has been operated from the on state to the off state, the DC relay 33 is turned off based on the fact that the temperature signal from the thermistor falls below the reference value. That is, the sub control circuit 20 turns off the DC relay 33 after waiting for the surface temperature of the top plate 2 to fall to a safe value. Note that the value added to the arrow in FIG. 2 indicates the magnitude of the current.

According to the said Example 1, there exists the following effect.
Commercial AC power is supplied to the left IH inverter circuit 25 via a power supply path 28 via the power switch 21, commercial AC power is supplied to the middle heater 8 via another power supply path 66 not via the power switch 21, and the upper heater 13 is supplied. Commercial AC power was supplied through another power supply path 67 that does not pass through the power switch 21, and commercial AC power was supplied to the lower heater 14 through another power supply path 68 that does not pass through the power switch 21. For this reason, since it becomes possible to drive the left IH coil 6 without reducing the output of the left IH coil 6 during double-sided baking in which both the upper heater 13 and the lower heater 14 are energized simultaneously, the power switch The 21 capacity shortage can be solved without using a high-capacity power switch. In addition, when the power switch 21 is operated from the on state to the off state, the state detection circuit 41 is configured to generate a detection signal that disables the heating permission circuit 40, so that the sub control circuit 20 runs away. Based on this, when the cooking is not stopped, the user can stop the cooking by operating the power switch 21 from the on state to the off state.

In the first embodiment, instead of the left IH coil 6, a heater that radiates or heats the food to be cooked may be used as the first heating source.
In the first embodiment, an IH coil that induction-heats cooking utensils may be used as the second heating source instead of any of the middle heater 8, the upper heater 13, and the lower heater 14.

The figure which shows Example 1 (The figure which shows the external appearance of an IH cooking heater) Block diagram showing electrical configuration The figure which shows the electrical structure of a state detection circuit and a heating permission circuit FIG. 2 equivalent diagram showing a conventional example

Explanation of symbols

  6 is a left IH coil (first heating source, coil), 8 is a middle heater (heater, second heating source, heat source), 13 is an upper heater (heater, second heating source, heat source), and 14 is lower Heater (heater, second heating source, heat source), 20 sub-control circuit (control circuit), 21 power switch, 25 left IH inverter circuit (inverter circuit), 28 power supply path, 31 power supply circuit, 32 Is an AC relay (main switch), 33 is a DC relay (sub switch), 35 is a main DC relay (switch), 36 is a sub DC relay (heat source switch, switch), and 37 is a sub DC relay (heat source). 38, a sub DC relay (heat source switch, switch), 40 a heating permission circuit, 41 a state detection circuit, 53 a main power feeding path, 54 a sub power feeding path, and 66 another power feeding. Road, 67 is another power supply path, 68 is another power supply , 72 denotes a photocoupler.

Claims (5)

A first heating source for cooking the food;
It is interposed in a power supply path for supplying power to the first heating source, and the user switches between an on state that closes the power supply path and a cut state that opens the power supply path. A power switch that can
A second heating source for cooking cooked food, wherein the power source is supplied through another power supply path not via the power switch;
A control circuit that drives and controls each of the first heating source and the second heating source;
A state detection circuit for detecting whether the power switch is in the on state or the off state;
When the state detection circuit detects the on state of the power switch, the control circuit allows the second heating source to be driven, and the state detection circuit detects the power switch off state. A heating cooker comprising a heating permission circuit for prohibiting the control circuit from driving the second heating source when the control circuit is in operation.   The cooking device according to claim 1, wherein the second heating source includes a heater.   The cooking according to claim 2, wherein a switch for opening and closing another power supply path for supplying the power to the heater is interposed on each of the one side and the other side of the heater. vessel.   The said state detection circuit is comprised including the photocoupler which mutually changes the electric potential of the detection signal output from the said state detection circuit by the ON state and the OFF state of the said power switch. The cooking device according to any one of 3 above. A coil for heating the cooking utensil;
An inverter circuit for converting a commercial AC power source into a driving power source for the coil;
It is interposed in a power supply path for supplying commercial AC power to the inverter circuit, and can be operated by a user between an on state where the power supply path of the inverter circuit is closed and an open state where the inverter circuit is opened. A power switch;
A heat source that heats a cooked food in a mode different from the coil, and a commercial AC power source is supplied through another power supply path that does not go through the power switch,
A heat source switch that is interposed between another power supply path that supplies commercial AC power to the heat source, and that is switched between an on state and an off state that opens another power supply path of the heat source; and
A power supply circuit for converting a commercial AC power source into a DC power source, wherein the commercial AC power source is supplied through a different main power feeding path and sub power feeding path, and
The main power supply path is interposed, and when the power switch is turned on, the main power supply path is turned on based on the fact that commercial AC power is supplied through the power switch, and the power switch A main switch that is turned off to open the main power supply path based on the fact that the commercial AC power supply is shut off in the off state,
A sub-switch that is interposed in the sub-feeding path, and is switched between an on-state that closes the sub-feeding path and an off-state that opens the sub-feeding path;
When the power switch is operated to be turned on, a DC driving power is supplied from the power circuit based on the main switch being turned on, and a sub drive signal for turning the sub switch on is supplied to the sub switch When the operation command is received, the inverter drive signal for driving and controlling the inverter circuit and the heat source drive signal for driving and controlling the heat source switch are output according to the reception result of the operation command. A control circuit to output,
A heating permission circuit that can be switched between a permission state in which the heat source drive signal output from the control circuit is applied to the heat source switch and a prohibition state in which the heat source drive signal output from the control circuit is not applied to the heat source switch;
The detection signal is generated based on a DC power source converted by the power circuit, and the heating permission circuit is set in a permission state based on the fact that commercial AC power is supplied through the power switch when the power switch is turned on. And a state detection circuit that generates a detection signal that disables the heating permission circuit based on the fact that a commercial AC power supply is cut off when the power switch is turned off. Cooking cooker.

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