JP4889536B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker provided with an induction heating device.

  Generally, induction heating cookers are provided with visual notification means and auditory notification means for heating output because the user cannot see the flame like a gas cooker and it is difficult to grasp the heating output. In particular, as an audio notification means, an apparatus has already been proposed in which the speed of the cooling fan is changed by the heating output and the heating output is notified to the user by a change in the sound of the fan (see, for example, Patent Document 1). There has also been proposed a device that sounds a notification sound when the heating output changes (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 10-253062 Japanese Examined Patent Publication No. 6-65127

  In particular, it is necessary to notify the user of the induction heating cooker of the change in the heating output. In the case of the conventional apparatus shown in Patent Document 1 in which the fan speed is variable by the heating output, the heating output is changed. Since it is a minute change, it is difficult to grasp the change of the heating output. Moreover, in the case of the conventional apparatus shown by patent document 2, although the notification sound is sounded at the time of the change of a heating output, the subject that it is difficult to hear the notification sound in the high heating output range with a large cooking sound or a fan sound. there were.

  This invention is made in order to solve such a problem in the conventional induction heating cooker, and to obtain an induction heating apparatus that can notify a user of a change in heating output with certainty. Objective.

An induction heating cooker according to the present invention includes an induction heating coil, an inverter circuit that supplies a high-frequency current to the induction heating coil, a cooling fan that cools the inside of the device, and the higher the heating output of the heating coil, At least a fan drive circuit that controls the rotation speed to increase, an auditory notification unit that increases sound pressure as the applied voltage increases, and an input winding, a first output winding, and an output feedback winding A transformer, and a transformer control circuit that increases or decreases an input voltage of the input winding so that a DC voltage output from the output feedback winding becomes a predetermined value. The transformer includes at least the input winding and the output. A plurality of winding layers including a feedback winding and the first output winding are provided, and the winding layer including the first output winding includes the output winding. Is disposed over the winding layer comprising other winding between the winding layers consisting Dobakku winding, the first output winding, the power supply to the hearing notification means, said output feedback winding line is obtained so as to supply power to the fan drive circuit.

An induction heating cooker according to the present invention includes an induction heating coil, an inverter circuit that supplies a high-frequency current to the induction heating coil, and a display circuit that increases the number of lighting elements as the heating output of the heating coil increases. Audible notification means in which the sound pressure increases as the applied voltage increases , a transformer having at least an input winding, a first output winding, and an output feedback winding, and a direct current output from the output feedback winding A transformer control circuit that increases or decreases the input voltage of the input winding so that the voltage becomes a predetermined value, and the transformer includes at least the input winding, the output feedback winding, and the first output winding. A winding layer comprising the first output winding and a winding layer comprising the other output winding between the winding layer comprising the output feedback winding. Is disposed over the layer, the first output winding, the supply power to the hearing notifying means, wherein the output feedback winding is obtained so as to supply power to the display circuit.

  In the induction heating cooker according to the present invention, the transformer has at least an input winding, a first output winding, and an output feedback winding, and these input winding, first output winding, and output feedback. There may be a mode in which the second output winding is provided in addition to the winding, or a mode in which only the input winding, the first output winding, and the output feedback winding are provided. The input winding may be divided into a plurality of winding portions and these winding portions may form different winding layers. Further, it goes without saying that other embodiments are possible without departing from the spirit of the present invention.

According to the induction heating cooker of the present invention, a cooling fan that cools the inside of the device , a fan drive circuit that controls the rotational speed of the cooling fan to be higher as the heating output of the heating coil is higher, and the applied voltage and the sound pressure is higher auditory notifying means higher, a transformer having at least an input winding and a first output winding and the output feedback winding, a DC voltage output from the output feedback winding and a predetermined value so as to a transformer control circuit for increasing or decreasing the input voltage of said input winding, said transformer has a plurality of windings comprising at least said input winding and said output feedback winding and said first output winding A winding layer composed of the first output winding is disposed between a winding layer composed of the output feedback winding and a winding layer composed of another winding. Said first output winding, the power supply to the hearing notifying means, wherein the output feedback winding, said fan since so as to supply power to the driving circuit, a small low heating output of a cooking sound and fan noise It is possible to provide an induction heating cooker capable of generating a notification sound with a low sound pressure in a range and a notification sound with a high sound pressure in a high heating output range with a large cooking sound or fan sound. Further, it is possible to automatically change the sound pressure of the notification means according to the heating output range without the need for a voltage change switch means or the like supplied to the notification means.

In addition, according to the induction heating cooker according to the present invention, the display circuit that increases the number of lighting of the lighting element as the heating output of the heating coil is high, the auditory notification means that the sound pressure is higher as the applied voltage is higher , A transformer having at least an input winding, a first output winding, and an output feedback winding, and increasing or decreasing the input voltage of the input winding so that a DC voltage output from the output feedback winding becomes a predetermined value . A transformer control circuit, and the transformer includes a plurality of winding layers including at least the input winding, the output feedback winding, and the first output winding, and includes the first output winding. winding layer is disposed over the winding layer comprising other winding between the winding layers consisting of the output feedback winding, the first output winding, the power to the hearing notification means Supply The output feedback winding. Thus supplying power to the display circuit, the high heating output range can be provided an induction heating cooker capable of sounding a high sound pressure notification sound. Further, it is possible to automatically change the sound pressure of the notification means according to the heating output range without the need for a voltage change switch means or the like supplied to the notification means.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of the induction heating apparatus according to Embodiment 1 of the present invention. In FIG. 1, the inverter circuit 3 converts the commercial frequency voltage supplied from the commercial power input unit 1 into a high frequency voltage. An induction heating coil (hereinafter simply referred to as a heating coil) 4 is applied with a high frequency voltage from the inverter circuit 3 and generates a high frequency current to inductively heat a load such as a metal pan. The heating output to the load can be adjusted by controlling the on / off timing of the switching elements constituting the inverter circuit 3. Since the control method of the inverter circuit 3 is well known, the description thereof is omitted here.

  When the heating output of the heating coil 4 is changed, the piezoelectric buzzer switch 15 is controlled to be turned on / off at a predetermined frequency so that the piezoelectric buzzer 16 as an audible notification means is sounded to notify the user of the change in the heating output.

  The multi-output winding transformer 8 includes an input winding A, a first output winding B, a second output winding C, and an output feedback winding D. The input winding A is a transformer control circuit. The commercial power source 1 is energized by the commercial power source 1 through the power source 10. The AC voltages induced in the first output winding B, the second output winding C, and the output feedback winding D are rectified by a diode and smoothed by a capacitor, respectively, and the DC voltages VB, VC, Output as VD.

  The DC voltage VB from the first output winding B is supplied to the piezoelectric buzzer 15 via the piezoelectric buzzer switch 15. The DC voltage VC from the second output winding C is supplied to the inverter control device included in the inverter circuit 3. The DC voltage VD from the output feedback winding D is displayed with a fan drive circuit 6 for the cooling fan 5 that cools the induction heating cooker and a display control circuit 14 that controls the lighting of the plurality of lighting elements 13. Supplied to the circuit.

The output feedback control circuit 9 inputs a control signal to the transformer control circuit 10 so that the DC voltage VD becomes a predetermined voltage. Trans control circuit 10, this controls the input of the input winding A on the basis of a control signal from the output feedback control circuit 9, the output feedback to the winding D to generate a predetermined DC voltage VD.

The DC voltages VB, VC, VD are voltages corresponding to the turns ratio of the respective windings B, C, D of the multi-output winding transformer 8, but generally, the input winding A and the output feedback winding D When the degree of coupling to is low, an error from a value based on the turn ratio of the winding becomes large, and as the degree of coupling is low, the error becomes large. The output winding, if the degree of coupling for an input winding A and the output feedback winding D is configured to be lower, higher voltage from the output winding larger the current flowing through the output feedback winding occurs To do.

  FIG. 2 is an explanatory diagram showing the arrangement of winding layers composed of the respective windings A, B, C, and D of the multi-output winding transformer 8. In FIG. 2, the winding layer composed of the output feedback winding D is arranged on the winding layer composed of the input winding A and is set so that the degree of coupling with the input winding A is high. . The winding layer consisting of the second output winding C is disposed on the winding layer consisting of the output feedback winding D, and the winding layer consisting of the first output winding B is the second output winding. It is disposed on a winding layer made of C. From this arrangement, the first output winding B has a large distance between the input winding A and the output feedback winding D, and the degree of coupling with these windings is low. Therefore, the output voltage of the first output winding B changes according to the size of the load connected to the output feedback winding.

  FIG. 3 shows the relationship between the heating output and the current flowing through the output feedback winding D, the relationship between the heating output and the DC voltage VB applied to the piezoelectric buzzer 16, and the relationship between the heating output and the sound pressure of the piezoelectric buzzer 16. It is a graph which shows each. As shown in FIG. 3, the fan drive circuit 6 performs control so that the higher the heating output, the higher the speed of the cooling fan 5 that cools the inside of the device. That is, the higher the heating output, the larger the current supplied to the fan drive circuit 6. Further, the display control circuit 14 performs control so that the number of lighting elements 13 is increased as the heating output is higher. That is, the higher the heating output, the larger the current flowing through the display circuit 12. Therefore, the current flowing through the output feedback winding D increases as the heating output increases.

  On the other hand, the current flowing to the piezoelectric buzzer 16 is smaller than the current flowing to the fan drive circuit 6 and the display circuit 14. That is, the load on the first output winding B is light, and the DC voltage VB supplied to the piezoelectric buzzer 16 becomes higher as the current flowing through the output feedback winding D increases, that is, as the heating output increases. Here, since the piezoelectric buzzer 16 has a characteristic that the sound pressure increases as the applied voltage increases, the sound pressure increases as the heating output increases as shown in FIG.

  According to the induction heating cooker according to the first embodiment of the present invention, the voltage applied to the piezoelectric buzzer 16 is low in the low heating output range where the cooking sound and fan noise are small, and when the heating output changes in this low heating output range. An alarm sound with a low sound pressure is generated, and the voltage applied to the piezoelectric buzzer 16 automatically increases in the high heating output range where the cooking sound and the fan sound are large. A high notification sound can be generated. Therefore, the user can more clearly grasp the change in the heating output.

  Further, as a modification of the first embodiment, the display circuit 12 having the plurality of lighting elements 13 and the display control circuit 14 that controls the lighting is not provided, and the rotation speed of the cooling fan 5 is controlled from the output feedback winding D. It is good also as an aspect which supplies electric power only to the fan drive circuit 6 and the feedback control circuit 9 to control. Alternatively, although the display circuit 12 is provided, power is supplied to the display circuit 12 by another power source other than the output feedback winding D, and the output is output to the fan drive circuit 6 that controls the rotation speed of the cooling fan 5. Electric power may be supplied from the feedback winding D.

  Further, as another modification of the first embodiment, the fan drive circuit 6 that controls the rotation speed of the cooling fan 5 is supplied with electric power from another power source other than the output feedback winding D, and the plurality of lighting elements 13 is supplied. Further, the display circuit 12 having the display control circuit 14 for controlling the lighting thereof may be supplied with power from the output feedback winding D.

Embodiment 2. FIG.
FIG. 4 is an explanatory diagram showing a configuration of a multi-output winding transformer of the induction heating cooker according to the second embodiment. In FIG. 4, the input winding A is divided into a first winding portion A1 and a second winding portion A2, and the winding layer composed of the first winding portion A1 is at the lowest layer. positioned. A winding layer consisting of the second output winding C is arranged on the winding layer consisting of the first winding portion A1 of the input winding A, and a winding layer consisting of the output feedback winding D is placed thereon. Is arranged. The winding layer consisting of the second winding portion A2 of the input winding A is arranged on the winding layer consisting of the output feedback winding D, and the winding layer consisting of the first output winding B is It arrange | positions on the winding layer which consists of 2 coil | winding part A2.

  According to the multi-output winding transformer shown in FIG. 4, the second of the input winding A is provided between the first output winding B and the output feedback winding D that supply a voltage to the fan drive circuit 6 and the display circuit 14. Since the winding portion A2 is interposed, the degree of coupling between the output feedback winding D and the first output winding B is low, and as the heating amount increases, the flowing current increases, and the same effect as described above can be achieved. it can.

It is a block diagram which shows the structure of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows arrangement | positioning of the coil | winding of the multi-output winding transformer of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship between the heating output, the electric current which flows into an output feedback winding, etc. of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the multi-output winding transformer of the induction heating cooking appliance which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Commercial power input part 3 Inverter circuit 4 Heating coil 5 Cooling fan 6 Fan drive circuit 8 Multi-output winding transformer 9 Transformer control circuit 10 Feedback circuit 12 Display circuit 13 Lighting element 14 Display control circuit 15 Piezoelectric buzzer switch 16 Piezoelectric buzzer A Input winding B First output winding C Second output winding D Output feedback winding

Claims (5)

An induction heating coil;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
A cooling fan that cools the inside of the equipment,
A fan drive circuit that controls the higher the heating output of the heating coil so as to increase the rotational speed of the cooling fan;
And auditory notification unit higher sound pressure is higher voltage increases the applied,
A transformer having at least an input winding, a first output winding, and an output feedback winding;
A transformer control circuit that increases or decreases the input voltage of the input winding so that the DC voltage output from the output feedback winding becomes a predetermined value ;
With
The transformer includes a plurality of winding layers including at least the input winding, the output feedback winding, and the first output winding,
The winding layer consisting of the first output winding is disposed between the winding layer consisting of the output feedback winding via a winding layer consisting of another winding,
It said first output winding supplies power to the auditory information means,
It said output feedback winding supplies power to the fan drive circuit,
An induction heating cooker characterized by that. An induction heating coil;
An inverter circuit for supplying a high-frequency current to the induction heating coil;
A display circuit for increasing the number of lighting elements as the heating output of the heating coil is higher ;
And auditory notification unit higher sound pressure is higher voltage increases the applied,
A transformer having at least an input winding, a first output winding, and an output feedback winding;
A transformer control circuit that increases or decreases the input voltage of the input winding so that the DC voltage output from the output feedback winding becomes a predetermined value ;
With
The transformer includes a plurality of winding layers including at least the input winding, the output feedback winding, and the first output winding,
The winding layer consisting of the first output winding is disposed between the winding layer consisting of the output feedback winding via a winding layer consisting of another winding,
It said first output winding supplies power to the auditory information means,
It said output feedback winding supplies power to the display circuit,
An induction heating cooker characterized by that. A display circuit for increasing or decreasing the number of lighting elements depending on the heating output of the heating coil;
2. The induction heating according to claim 1, wherein the first output winding supplies power to the hearing notification means, and the output feedback winding supplies power to the fan drive circuit and the display circuit. Cooking device.   The transformer includes a second output winding that supplies power to a control circuit that controls the inverter circuit, and a winding layer formed of the first output winding is a winding layer formed of the output feedback winding. The induction heating cooker according to any one of claims 1 to 3, wherein the induction heating cooker is disposed between the first output winding and the winding layer.   The input winding is composed of a first winding portion and a second winding portion, and a winding layer made of the first output winding is a winding layer made of the output feedback winding. 4. The structure according to claim 1, wherein the first winding portion and the second winding portion of the input winding are disposed between each other via a winding layer formed between the first winding portion and the second winding portion. The induction heating cooker of crab.

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