JPH04277486A - Induction heating cooking apparatus - Google Patents

Abstract

PURPOSE:To make automatic operation of a ventilation device efficiently by allowing indoor ventilation device to operate interlocking with the operation of the cooling device of an induction heating cooking apparatus according to the invention, and prevent a user from suffering burns with touching a top plate at high temp. after the cooking is finished. CONSTITUTION:To the AC mains is connected a series circuitry of a cooling fan motor 24 and a triode AC 30 turned on when No.1 heating coil 14 or No.2 heating coil 16 is put on, and a ventilation device drive signal output circuit 28 is connected in parallel with the cooling fan motor 24, and at the output terminal 28a of this circuit 28 an output signal is given in compliance with the AC voltage impressed on the cooling fan 24. An external ventilation device 29 is driven with this output signal, and thereby it is practicable to perform automated effective operation of the ventilation device interlocking with the heating operation and with the operation of cooling fan motor 24. A high temp. indication circuit 39 monitors the impressed voltage on the cooling fan motor 24, and in the case the top plate bears a high temp. and the motor 24 remains out of operation. the lighting mode shall be changed into the twinkling mode to inform the user of current situation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker.

0002

[Prior Art] In recent years, induction heating cookers, which use high-frequency magnetic fields to induce eddy currents in the bottom of loaded pots for heating, have attracted attention as a clean, safe, and highly heat-efficient cooking method.
High output is achieved by using a 200V power source.

[0003] Hereinafter, a conventional induction heating cooker will be explained with reference to FIG. As shown in the figure, a heating coil 2 that induction-heats a load pot 1 for cooking, a frequency converter 4 such as an inverter that converts a commercial power source 3 into high frequency and supplies the high frequency to the heating coil 2, and a frequency converter 4 or a heating coil. A cooling fan motor 5, a power switch 6, a fuse 7, and a heating switch 13 are provided. A connector 12 is also provided, and the two terminals of this connector 12 are connected between the power lines on the load side of the power switch 6, and can be used as a power source for the ventilation fan motor 8 installed near the induction heating cooker. ing. Further, a temperature sensor 10 is in contact with the back surface of the ceramic plate 9 on which the load pot 1 is placed, and a control circuit included in the frequency converter 4 detects the signal of this temperature sensor 10, and the temperature of the back surface of the ceramic plate 9 is determined. When the temperature is high, the light emitting diode 11 is turned on.

In the above configuration, when the power switch 6 is turned on, the cooling fan motor 5 inside the induction heating cooker is driven to cool the internal parts, and the ventilation fan motor 8 inside the room starts rotating, causing the induction heating cooker to cool. Steam and smoke emitted from the food being cooked are discharged outside. When the heating switch 13 is pressed, the frequency converter 4 operates and a high frequency current is supplied to the heating coil 2 and the load pan 1
heat up. When the load pot 1 is heated and reaches a high temperature, the heat is conducted to the top plate 9 and further to the temperature sensor 10. When the temperature sensor 1 reaches approximately 90° C., the control circuit included in the frequency converter 4 detects this and lights up the light emitting diode 11 to notify the user to avoid burns.

[0005]

However, in the above configuration, when the power switch 6 is turned on, the heating switch 13
Since the ventilation fan motor 8 is driven without pressing , there is a risk that the user may mistakenly believe that the heating operation has started due to the sound. In addition, if the user sets the timer device inside the frequency converter 4 to stop the heating operation after a predetermined time and leaves the induction heating cooker unattended, the timer will operate and the induction heating cooking will start. Since the power switch 6 remains on even when the heating operation is stopped, the ventilation fan motor 8 continues to operate, unnecessarily consuming power and removing unnecessary power from the ventilation fan motor 8. It will make noise. Further, a connector 12 is provided for driving the ventilation fan motor 8 from the outside, but if the user accidentally shorts the terminals of the connector 12 while the power switch 6 is turned on, the fuse 7 will break. The induction cooker stops functioning. Furthermore, when the induction heating cooker heats the load pan 1 and the top plate 6 receives heat from the load pan 1 and reaches a high temperature, the temperature sensor detects this and lights up the light emitting diode 11. When the power switch 6 is turned off, power is not supplied to the control circuit of the frequency converter 4, so the light emitting diode 11 is turned off. Therefore, when the load pan 1 is removed at this time, the light emitting diode 6 is turned off, so if the user thinks that the top plate 6 is cold, and touches the surface of the top plate 6 on which the load pan was placed. There is a risk of burns.

[0006] The present invention solves the above-mentioned problems by making the indoor ventilation system work efficiently by linking it with the operation of the cooling system of the induction heating cooker, thereby minimizing the operation time of the ventilation system. By shortening the length, the primary purpose is to save power consumption of the ventilation system and reduce the influence of noise emitted from the ventilation system.

[0007] The second purpose is to make the indoor ventilation system work efficiently by linking it with the operation of the cooling system of the induction heating cooker, and to ensure that even if its output is short-circuited, it will not affect the main body of the induction heating cooker. The object of the present invention is to provide a control output means for controlling the on/off of the ventilation system without giving any power.

[0008] The third purpose is that if the heating operation is stopped while the top plate is at a high temperature after cooking, the user may not realize that the top plate is still hot and may touch it and get burned. The goal is to prevent

[0009]

[Means for Solving the Problems] In order to achieve the above first object, the present invention provides a heating coil for inductively heating a load pot, and a high-frequency current that is supplied to the heating coil by converting a commercial power source into a high-frequency power source. A frequency converter that cools electrical components of the frequency converter, a cooling fan motor that cools electrical components of the frequency converter, and a DC power source or an AC power source connected in series with the cooling fan motor, and that A switching element that drives a cooling fan motor, and a ventilation device control signal output means that outputs a signal that controls on/off of a ventilation device in a room in which the frequency converter is arranged, and the ventilation device control signal output means The structure is such that an on signal is output in synchronization with driving of the element.

In order to achieve the above second object, the present invention provides a heating coil for inductively heating a load pot, a frequency converter for converting a commercial power source into a high frequency power source and supplying a high frequency current to the heating coil, A cooling fan motor that cools electrical components of the frequency converter is connected in series with the cooling fan motor between a DC power source or an AC power source, and drives the cooling fan motor substantially in conjunction with the heating operation of the frequency converter. Ventilator control signal output means includes a switching element and a removable output terminal that outputs a signal for controlling on/off of a ventilation system in a room in which the frequency converter is arranged, and the ventilation system control signal output means The device is connected in parallel to the cooling fan motor, monitors the voltage applied to the cooling fan motor via a resistor that limits the voltage, and outputs a signal to the output terminal depending on the presence or absence of the voltage.

In order to achieve the third object, the present invention also provides a heating coil for inductively heating a load pot, a frequency converter that converts a commercial power source into a high frequency power source and supplies a high frequency current to the heating coil, It is equipped with a cooling fan motor that cools electrical components in almost synchronized with the heating operation of the frequency converter, and a display device that lights up or displays according to the temperature of the top plate on which the load pan is placed, and the display device is connected to the cooling fan motor. The lighting or display mode is changed in conjunction with the on/off of the light.

0012

[Function] According to the structure of claim 1, the induction heating cooker of the present invention has a cooling fan motor connected in series with a switching element between the DC power source or the AC power source, and the heating operation of the frequency converter is controlled by the switching element. The cooling fan motor is driven almost in conjunction. Furthermore, in synchronization with the driving of the switching element, the ventilation system control signal output means outputs a signal for controlling the on/off of the ventilation system in the room in which the frequency converter is installed. When the device is not in a heating state and is in a standby state, the ventilation device does not operate, and operates simultaneously in substantially conjunction with the heating operation of the frequency converter. Therefore, the ventilation system will not operate unnecessarily just by turning on the power switch, and the warm exhaust gas that comes out from the exhaust port of the induction heating cooker during heating operation after cooling the components of the frequency converter. (air), smoke and water vapor generated from the food to be cooked during the heating operation, or air heated by the heated food to be efficiently exhausted outside the room.

Further, according to the structure of claim 2, a switching element and a cooling fan motor are connected in series between the DC or AC power source, the switching element being electrically connected in substantially synchronization with the heating operation of the frequency converter, and the cooling fan motor being connected in parallel with the cooling fan motor. A ventilator control output means including a removable output terminal that outputs a signal for controlling on/off of the indoor ventilation device is connected, and a signal is output to the output terminal depending on the presence or absence of voltage applied to the cooling fan motor. The induction heating cooker is configured to automatically operate the ventilation system in conjunction with the heating operation of the frequency converter and the operation of the cooling fan motor, and is equipped with a removable output terminal. be able to. In addition, the ventilation system control output means is configured to monitor the voltage applied to the fan motor via a limiting resistor and output a signal depending on the presence or absence of the voltage, so it can be realized with a simple circuit, and the user can Even if the output terminal of the ventilation device control output means is short-circuited, it is possible to easily prevent the function of other circuits of the induction heating cooking device from being affected.

[0014]Furthermore, according to the structure of claim 3, the present invention is provided with a display device that lights up or displays according to the temperature of the top plate, so that the user can recognize when the load pot or the top plate has become high temperature. There is less risk of getting burned by touching it. In addition, the display mode changes in conjunction with the on/off of the cooling fan motor, which is almost linked to the heating operation, so if the heating operation is stopped and the top plate temperature is still high, for example, the display mode changes from continuous lighting to blinking. By changing to a display mode with a stronger warning level, users can be more strongly warned of the danger of burns, and the risk of burns to users or young people due to residual heat on the top plate after use can be further reduced. It can be done less.

[0015]

[Embodiment] (Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of a two-burner induction heating cooker, and as shown in this figure, the first heating coil 1
The first inverter 15 and the second inverter 15 supply high frequency current to the
and a second inverter 17 that supplies a high-frequency current to the heating coil 16 , and the inputs of the first inverter 15 and the second inverter 17 are connected to a commercial power source 19 via a one-way power switch 18 . . The first control circuit 20
A first heating switch 21 is connected to a first control circuit 20 and starts and stops this control circuit and the first inverter 15. The second control circuit 22 includes a control circuit for controlling the oscillation operation of the second inverter 17, and the second heating switch 23 is connected to the second control circuit 22 to control the activation and operation of the second inverter. Perform a stop. A cooling fan motor 24 is provided to cool the switching semiconductors or other current components constituting the first inverter 15 and the second inverter 17. The cooling fan motor 24 is an induction motor with fixed windings. It operates when commercial power supply voltage is applied to the input terminal. One end of the input terminal of the fixed winding of the cooling fan motor 24 is connected to the commercial power line on the load side of the power switch 18 , and the other end of the fixed winding of the cooling fan motor 24 is connected to one end of the relay 25 . The other end is connected to the commercial power line on the side to which the power switch 18 is not connected. A drive signal is supplied to the drive winding of the relay 25 from a relay drive circuit 26 . The relay drive circuit 26 includes a first
The relay drive signal from the first control circuit 20 is output when the heating switch 21 is turned on, and the second control circuit 22 is output when the second heating switch 23 is turned on.
The relay drive signal from O is input to the OR circuit 27, and O
The output signal from the R circuit 27 is supplied to a relay drive circuit 26 and a ventilator control signal output circuit 28. The ventilation device control signal output circuit 28 is provided with a removable connector (not shown), and is configured to be able to connect the ventilation device 29 including the ventilation fan motor 29b and the ventilation fan motor drive circuit 29a. There is.

The operation of the induction heating cooker constructed as described above will be explained. When the power switch 18 is turned on and the first heating switch 21 is turned on, the first control circuit 20 causes the first inverter 15 to oscillate, causing a high frequency current to flow through the first heating coil 14 placed near it. At the same time, a relay drive signal is output to the OR circuit 27, and the OR circuit 27 receives the signal and sends a signal to the relay drive circuit 26 to turn on the contact of the relay 25. When the contact of the relay 25 is turned on, the commercial power supply voltage is applied to the cooling fan motor 24, and the cooling fan motor 2
4 starts rotating. Further, the OR circuit 27 simultaneously outputs an on signal to the ventilator control signal output circuit 28, and the ventilator control signal output circuit 28 receives the on signal and outputs a ventilator drive signal to its output terminal. When the ventilation device 29 is connected to the terminal, the ventilation fan drive circuit 29a receives this output signal and operates the ventilation fan 29.
b to start ventilation of the room air. Also, the second
When the heating switch 23 is turned on, a high frequency current is similarly supplied to the second heating coil 16, and a relay drive signal is input to the OR circuit 27, so that the first heating switch 21 and When one or both of the second heating switches 23 are turned on, the cooling fan motor 24 is driven, and a signal for driving the ventilation system is output to the output terminal of the ventilation system control signal output circuit 28.

As described above, according to this embodiment, when either or both of the first heating coil 14 and the second heating coil 16 are excited and enter the heating state, the induction heating cooker Since the indoor ventilation system equipped with this works, the smoke and steam from the food being cooked, as well as the warm air coming out of the induction heating cooker's exhaust port using the cooling fan inside the induction heating cooker, can be efficiently exhausted outside. In addition, since the ventilation device 29 and the cooling fan motor 24 do not operate only when the power switch 18 is turned on, the first control circuit 20 or the second control circuit 22 does not operate.
has a built-in timer function, so that the heating operation is stopped after a predetermined time by the timer operation, so that even if the user leaves it unattended, the cooling fan motor 24 and ventilation device 29 will stop at the same time as the heating operation of the induction heating cooker stops. Therefore, ventilation system 2
9 will not operate unnecessarily and waste power. Further, the ventilation device 29 is connected to the first inverter 15.
Alternatively, the operation is not linked to the individual heating operation of the second inverter 17, but is linked to the operation of the cooling fan motor 24, which operates when any one of the inverters operates. The inconvenience that the ventilation device 29 also stops when it stops does not occur.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a circuit block diagram of a two-burner induction heating cooker similar to FIG. 1, but in FIG.
6, second inverter 17, commercial power supply 19, first control circuit 20, first heating switch 21, second control circuit 2
2, second heating switch 23, cooling fan motor 24,
The ventilation fan drive circuit 29a and the ventilation fan 29b are shown in FIG.
The configuration is similar to that of . The difference from the configuration in Figure 1 is that
The relay 25 in FIG. 1 is replaced with a triac 30 in which a series circuit of a snubber resistor 31 and a snubber capacitor 32 is connected in parallel, and the gate drive circuit of the triac 30 is used instead of the relay drive circuit 26 and OR circuit 27 in FIG.
A parallel circuit of a first phototriac 34 and a second phototriac 35 connected between the gate of the triac 30 and the T2 terminal, and a series connection body of a resistor 33;
A first phototriac drive circuit 36 receives a signal from the control circuit 20 of the first phototriac to drive the first phototriac 34, and a second phototriac drive circuit receives a signal from the second control circuit 22 and drives the second phototriac 35. A connector 28a consisting of a resistor 28d and connection terminals 28b and 28c, and a resistor 28e, are connected in parallel to the cooling fan motor 24, and the ventilator control signal output circuit 28 of FIG. A first temperature control point configured by a series circuit of sensor 4
4 and an output from a second temperature sensor 47 provided in the vicinity of the second heating coil 16 and in contact with the back surface of the second ceramic plate 46 on which the second load pan 45 is placed. Depending on the signal, the first light emitting diode 4
A high temperature display circuit 39 that lights up the zero or second light emitting diode 41 is provided, and is connected to the input side of the power switches 18a and 18b provided on one side of the input terminals of the first inverter 15 and the second inverter 17, respectively. The primary winding of the transformer 38 is connected between the commercial power lines, and the secondary winding is input to the high temperature display circuit 39 to supply the power supply voltage. Input the potential of the commercial power line on the side where the T2 terminal is not connected, and change the lighting or blinking mode of the first light emitting diode 40 and the second light emitting diode 41 depending on the presence or absence of voltage between them. The point is that it is configured to do so. Note that the ventilation device 29 is an external device that connects the diode 2.
9c, photocoupler 29d, ventilation device drive circuit 29a,
It is configured to include a ventilation fan motor 29b, and can be arbitrarily connected or separated from the induction heating cooker through a connector 28a. Terminals 28b and 28c of the connector 28a are connected between the gates of a photocoupler 29d, and a diode 29c This prevents a reverse breakdown voltage from being applied to the gate portion of the photocoupler 29d. Photo coupler 29
The output signal of d is input to the ventilation device drive circuit 29a, and the ventilation device drive circuit 29a drives or stops the ventilation fan motor 29b according to the output signal of the photocoupler 29d. The first control circuit 20 is supplied with its control power from a transformer 48 whose primary winding is connected to the load side of the first power switch 18a, and the second control circuit 22 is supplied with its control power from a transformer 48 whose primary winding is connected to the load side of the first power switch 18a. The power is supplied from a transformer 49 having a primary winding connected to the load side of the transformer 49.

The operation of the induction heating cooker constructed as described above will be explained below. When the first power switch 18a is turned on and the first heating switch is turned on, the first inverter oscillates and the first heating coil 15
A high frequency current is supplied to inductively heat the first load pot 42 , and a drive signal is output from the first control circuit 20 to the first phototriac drive circuit 36 , which in turn conduction. The same applies when the second power switch 18b and the second heating switch 23 are turned on, and when either heating coil is in heating operation, the triac 30
conducts. When the triac 30 becomes conductive, the commercial power supply voltage is applied to the winding of the cooling fan motor 24, the cooling fan motor 24 starts rotating, and the commercial power supply voltage is applied to the input terminals of the ventilation system control signal output circuit 28 and the high temperature display circuit 39. is applied. When a commercial power supply voltage is applied to the input terminal of the ventilator control signal output circuit 28, if the ventilator 29 is connected to the connector 28a, a current flows to the input side of the photocoupler 29d via the resistor 28d and the resistor 28e. , the output current of the photocoupler 29d is connected to the ventilation fan drive circuit 29.
The ventilation fan drive circuit 29a operates the ventilation fan 29b accordingly. As the heating by the induction heating cooker continues, the temperature of the load pot rises, and the first
The first ceramic plate 4 near the temperature sensor 44 of
3 or the temperature of the second ceramic plate 46 near the second temperature sensor 47 is about 90° C. or higher, the first temperature sensor 44 or the second temperature sensor 47 and the high temperature display circuit 39 include The detection circuit detects this and continuously lights up the light emitting diode 40 or the light emitting diode 41, respectively. After cooking, power switch 1
8a, 18b or the heating switches 21, 23 to turn off the heating operation of both the heating coil 14 and the heating coil 16, the first control circuit 20 and the second control circuit 22 do not output the drive signal for the triac 30, triac 3
0 is not conductive, no commercial power supply voltage is applied to the input terminal of the high temperature display circuit 39, and at this time, the temperature of the first ceramic plate 43 or the second ceramic plate 46 is detected by the first or second temperature sensor 44. , 47, the high temperature display circuit 39 switches the first light emitting diode 40 or the second light emitting diode 41 from continuous lighting to blinking operation. When the temperature of each ceramic plate becomes approximately 90° C. or lower, the corresponding light emitting diode is turned off.

As described above, simply turning on the power switch 18a or 18b will not operate the first heating coil 14 or the second heating coil 16, nor will the ventilation device 29. Also, turn on the power switch and heating switch corresponding to each heating coil, and turn on the first heating coil 14 or the second heating coil 1.
When at least one heating coil of 6 performs a heating operation,
As the cooling fan motor 24 starts operating, a drive signal is supplied to the ventilation device 29 via the connector 28a, and the ventilation device starts operating, and the heating operation of the induction heating cooker, the cooling fan motor, and the ventilation device are almost linked. Therefore, the smoke and water vapor from the food being cooked or the warm air coming out of the exhaust port of the induction heating cooker can be efficiently exhausted outside by the cooling fan inside the induction heating cooker. Further, the ventilation device control signal output circuit 28 can be configured with a simple circuit consisting of a series circuit of two resistors and one connector connected in parallel to the cooling fan motor 24, and the ventilation device 29 is a device connected from the outside. There is a possibility that the user may short-circuit the input terminals, or that the output terminals 28b and 28c may be grounded by accident, but even in such cases, the resistors 28d and 28e are used to limit the current. It can prevent electric shock and leakage accidents without affecting the induction heating cooker itself. Further, when cooking is being performed in the induction heating cooker, that is, when the first heating coil 14 or the second heating coil 16 is operating, the first ceramic plate 43 or the second ceramic plate 46 becomes hot. If this happens, the first light emitting diode 40 or the second light emitting diode 41 will light up to alert the user to avoid burns, and when both heating coils stop working after cooking, each ceramic When the plate is hot, the corresponding light emitting diode changes its lighting mode from continuous lighting to flashing, so it provides a stronger warning to the user after cooking, when the user is even less aware of the high temperature of the ceramic plate than during cooking. This reduces the risk of burns caused by exposure to the ceramic plate, and since the light automatically turns off when the ceramic plate cools down, it does not become an eyesore for the user.

In the first and second embodiments, the type of cooling fan motor 24 was an induction motor type that operates when the commercial power supply voltage is applied to the fixed winding, but it is also driven by DC voltage. A configuration using a commutator motor or the like may also be used. In addition, in the first and second embodiments, the power supply voltage for the ventilation system is supplied from a separate source from the induction heating cooker body, but the induction heating cooker is provided with a power supply voltage output terminal. It is also possible to provide a removable structure. Further, in the second embodiment, the ventilator control signal output circuit 28 was configured with two resistors and one connector, but the circuit configuration is not limited to this. may be included in the ventilator control signal output circuit 28, or the resistor 28e may be omitted. However, even if the resistor 28e is omitted, there will be no problem even if the terminals 28b and 28c are shorted by mistake, but if the terminal 28c is accidentally grounded, the power line may burn out or the breaker on the switchboard may shut off. There is a risk that it will. Further, in the second embodiment, the top plate 43 and the top plate 46 are separated, but they may be integrated.

[0024]

As described above, according to the present invention, a switching device and an element cooling fan motor, which are driven substantially in conjunction with the heating operation of a frequency converter, are connected in series between a DC power supply or an AC power supply, and the switching Since the ventilator control signal output means outputs a ventilator ON signal in synchronization with the driving of the elements, the ventilator operates substantially in conjunction with the operation of the cooling fan motor and the heating operation of the induction heating cooker. Therefore, the ventilation device does not operate unnecessarily, such as when the induction heating cooker is not in the heating state even though the power switch is turned on, and the induction heating cooker starts heating. When the heating operation is started, the ventilation system automatically operates to cool down the components of the frequency converter that come out from the exhaust port of the induction heating cooker during heating operation, and the heated exhaust air (air) is used to cool down the cooked food. It efficiently exhausts smoke, water vapor, or hot air from cooking to the outside, and if the heating operation stops, the cooling fan and ventilation system stop driving even if the power switch is turned on, so there is no waste. This can prevent power consumption from being consumed.

[0025] Furthermore, the present invention connects in series a switching element and a cooling fan motor that are driven substantially in conjunction with the heating operation of a frequency converter between a DC or AC power source, and connects the cooling fan motor in parallel with the cooling fan motor. A ventilation system control output means including an output terminal that outputs a signal for controlling on/off of the device is connected, and the ventilation system is configured to output a signal to the output terminal depending on the presence or absence of voltage applied to the cooling fan motor. Therefore, it operates almost in conjunction with the operation of the cooling fan motor and the heating operation of the induction heating cooker. Therefore,
The ventilation device does not operate unnecessarily, such as when the power switch is turned on but the induction heating cooker is not in the heating state, and the induction heating cooker starts heating operation. Then, the ventilation system automatically operates to cool down the components of the frequency converter that come out from the exhaust port of the induction heating cooker during heating operation, and remove the heated exhaust air (air) from the food to be cooked during heating operation. This device efficiently exhausts smoke, steam, and air heated by cooking to the outside. Furthermore, the ventilation system control output means is configured to monitor the voltage applied to the fan motor via a limiting resistor and output a signal depending on the presence or absence of the voltage, so it can be realized with a simple circuit, and the user can Even if the output terminals of the ventilation system control output means are short-circuited,
It is also possible to easily prevent the function of other circuits of the induction heating cooker from being affected.

Further, according to the present invention, when the temperature of the top plate becomes high due to the heating operation of the induction heating cooker, the display device lights up or indicates the temperature, and the heating operation is linked to the on/off of the cooling fan motor. Since the lighting or display mode changes, if the temperature of the top plate is still high after turning off the power switch or heating switch, the heating operation will be stopped and the warning level will be changed from continuous lighting to flashing, for example. By setting the display mode to a strong display mode, it is possible to more strongly alert the user to the danger of burns, and further reduce the risk of burns to the user or young person due to the residual heat of the top plate after use.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram of an induction heating cooker according to a second embodiment of the present invention.

[Figure 3] Circuit block diagram of a conventional induction heating cooker

[Explanation of symbols]

14 Heating coil (first heating coil) 15 Frequency converter (first inverter) 16 Heating coil (
Second heating coil) 17 Frequency converter (second inverter) 19 Commercial power supply 24 Cooling fan motor 25 Switching element (relay) 28 Ventilator control signal output means 28a Output terminal (connector) 29 Ventilator 30 Switching element (TRIAC) ) 39 Display device (display device drive circuit) 40 Display device (first light emitting diode) 41 Display device (second light emitting diode) 42 Load pot (first load pot) 43 Load pot (second load pot)

Claims (3)

[Claims] 1. A heating coil that inductively heats a load pot, a frequency converter that converts a commercial power source into a high-frequency power source and supplies a high-frequency current to the heating coil, and a cooling fan motor that cools electrical components of the frequency converter. a switching element that is connected in series with the cooling fan motor between a DC power source or an AC power source and drives the cooling fan motor substantially in conjunction with the heating operation of the frequency converter; ventilation system control signal output means for outputting a signal for controlling on/off of the ventilation system;
The induction heating cooker is configured such that the ventilation device control signal output means outputs an ON signal in synchronization with driving of the switching element. 2. A heating coil that inductively heats a load pan, a frequency converter that converts a commercial power source into a high-frequency power source and supplies a high-frequency current to the heating coil, and a cooling fan motor that cools electrical components of the frequency converter. a switching element that is connected in series with the cooling fan motor between a DC power source or an AC power source and drives the cooling fan motor substantially in conjunction with the heating operation of the frequency converter; ventilation system control signal output means including a removable output terminal for outputting a signal for controlling on/off of the ventilation system, the ventilation system control signal output means is connected in parallel to the cooling fan motor, and the ventilation system control signal output means is connected in parallel to the cooling fan motor. An induction heating cooker configured to monitor the voltage applied to the voltage through a resistor that limits it, and output a signal to the output terminal depending on the presence or absence of the voltage. 3. A heating coil that inductively heats a load pot, a frequency converter that converts a commercial power source into a high-frequency power source and supplies a high-frequency current to the heating coil, and an electrical component that is substantially interlocked with the heating operation of the frequency converter. and a display device that lights up or displays a display according to the temperature of a top plate on which the load pan is placed, and the display device lights up or changes display mode in conjunction with turning on and off of the cooling fan motor. An induction heating cooker configured to