JPH08298181A - Operation display circuit for induction heating device - Google Patents

Abstract

PURPOSE: To eliminate necessity for a cable between itself and a heating device by connecting a coil of detecting magnetic flux generated by a heating coil in parallel to a display part of one set or more wherein a resistor, Zener diode and a light emitting diode are connected in series. CONSTITUTION: A display circuit 2 is constituted by parallelly connecting one set or more, for instance, three sets of luminous parts 3a to 3c, to be connected to a coil 1 of detecting magnetic flux generated by a heating coil. In each luminous part, resistors 4a to 4c, Zener diodes 5a to 5c and light emitting diodes 6a to 6c are connected in series. When voltage generated in the coil 1 exceeds Zener voltage of the diodes 5a to 5c, light is emitted in the diodes 6a to 6c. Because each Zener voltage is set to a value increased stepwise, a diode of emitting light is different in accordance with an output condition of a heating device, to provide four stages of light emitting displays including in the case of not emitting at all in all the diodes. In this way, the circuit 2 is simply constituted by only a passive element, further to eliminate necessity for connection to the heating device, so as to enhance reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation display circuit of an induction heating device such as an electromagnetic cooker.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional example of an operation display circuit of an induction heating device of this type. In FIG. 5, 51 is a display control circuit including an insulating circuit 54 and an arithmetic circuit 55, 52 is a display device such as a 7-segment LED, and 53 is a cable connecting the display control circuit 51 and the display device 52.

This operation display circuit insulates detection signals such as output current, input voltage, and input current from the induction heating device with an insulating circuit 54, and an arithmetic circuit 55 uses the insulated detection signal to detect the induction heating device. The output power is calculated, and this value is displayed on the display 52 via the cable 53.

[0004]

According to the operation display circuit of the conventional induction heating device described above, a cable is required to connect between the induction heating device and the operation display circuit or between the display control circuit and the display. There is a problem that the circuit becomes complicated and the cost increases because the display control circuit requires an insulating circuit and an arithmetic circuit.

An object of the present invention is to provide an operation display circuit of an induction heating device which solves the above problems.

[0006]

According to a first aspect of the present invention, there is provided a detection circuit for detecting a magnetic flux generated by a heating coil in an operation display circuit of an induction heating device for induction-heating an object to be heated by a heating coil fed from a power source. It is assumed that a coil and a display circuit including at least one display unit in which a resistor, a Zener diode, and a light emitting diode are connected in series are connected in parallel.

A second invention is the same as the first invention,
The detection coil can be attached to and detached from the display circuit. In a third aspect based on the first or second aspect, the operation display circuit is installed at the tip of a rod-shaped insulator. According to a fourth aspect of the present invention, in the first aspect, the operation display circuit is incorporated in a portion of the induction heating device that contacts an object to be heated.

[0008]

According to the present invention, the magnetic flux generated by the heating coil is detected by the detection coil, the light emitting diode is caused to emit light by the voltage generated in the detection coil, and a cable for connecting the operation display circuit and the induction heating device is provided. The common action is that it can be eliminated.

Further, according to the first aspect of the present invention, the output state of the induction heating device can be displayed stepwise by providing a plurality of sets of display sections and setting the Zener voltages of the respective Zener diodes to different values. According to the second invention, even when the output ratings of the induction heating device are used differently, it can be dealt with by detaching and replacing the detecting coils having different numbers of turns, and detachable and replacing by the detecting coils having different shapes. This makes it possible to support various shapes of induction heating devices.

Further, according to the third invention, in addition to the operation of the first or second invention, it is possible to display the portion where the leakage magnetic flux from the induction heating device is generated. Is.

[0011]

1 is a circuit configuration diagram of an operation display circuit of an induction heating apparatus showing a first embodiment of the present invention. In FIG. 1, 1 is a detection coil, 2 is a display circuit, 3a to 3c are light emitting parts, 4a to 4c are resistors, 5a to 5c are zener diodes, and 6a to 6c are light emitting diodes.

In this operation display circuit, the display circuit 2 has 3
A magnetic flux generated by a heating coil (not shown) is detected by the detection coil 1 and a voltage generated in the detection coil 1 exceeds, for example, the Zener voltage of the Zener diode 5a of the light emitting unit 3a. Diode 6
Light a. In addition, Zener diodes 6a to 6c
Due to the output state of the induction heating device by gradually increasing the Zener voltage of, the light emitting diodes 6a to 6c do not all emit light, only the light emitting diode 6a emits light, the light emitting diodes 6a and 6b emit light, and the light emitting diode 6a All of 6c can emit light and can be displayed in four stages. In addition, the resistors 4a to
4c is for current limiting of the light emitting units 3a to 3c.

FIG. 2 is a block diagram of an operation display circuit of an induction heating apparatus showing a second embodiment of the present invention. Components having the same function as in FIG. Omit it. That is, in FIG. 2, for example, the connectors 10a, 10 are provided at both ends of the detection coils 1a, 1b having different numbers of turns.
b, so that the display circuit 2 can be easily attached / detached and replaced.

FIG. 3 is a block diagram of an operation display circuit of an induction heating apparatus showing a third embodiment of the present invention. Components having the same functions as those in FIG. Omit it. That is, in FIG. 3, the detection coil 1 and the display circuit 2 are molded with a heat-resistant resin or the like and attached to the tip of a rod-shaped insulator 20 having an appropriate length.

FIG. 4 is a block diagram of an operation display circuit of an induction heating apparatus showing a fourth embodiment of the present invention. Components having the same functions as those in FIG. Omit it. That is, in FIG. 4, the heating coil 30a is installed on the top of the electromagnetic cooker body 30 as an induction heating device, and the detection coil 1 and the display circuit 2 which are attached to the cutout portion of the top plate 31 made of a heat-resistant insulating material. And
The detection coil 1 is arranged in parallel with the spiral heating coil 30a.

[0016]

According to the present invention, the operation display circuit of the induction heating device can be constituted by a simple circuit having only passive elements, and the connection with the induction heating device is not required, so that the reliability is high, the size is reduced, and the cost is reduced. Is possible. Further, according to the second aspect of the present invention, various shapes,
It is possible to use an induction heating device with a large capacity, and no specialized technology is required for this attachment / detachment work.

According to the third aspect of the invention, since this operation display circuit is small and does not require connection with an induction heating device, it can be easily attached to the tip of a rod-shaped insulator, and it can be attached to the human body. It can be operated safely and can be used with induction heating devices of various shapes and capacities. Furthermore, according to the fourth aspect of the present invention, this operation display circuit is small in size and does not require connection with the induction heating device, so that maintenance and inspection work of the induction heating device is facilitated.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an operation display circuit of an induction heating device showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an operation display circuit of an induction heating device showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram of an operation display circuit of an induction heating device showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an operation display circuit of an induction heating device showing a fourth embodiment of the present invention.

FIG. 5 is a block configuration diagram of an operation display circuit of an induction heating device showing a conventional example.

[Explanation of symbols]

 1 Detection coil 1a, 1b Detection coil 2 Display circuit 3a-3c Light emitting part 4a-4c Resistor 5a-5c Zener diode 6a-6c Light emitting diode 10a, 10b Connector 20 Insulator 30 Electromagnetic cooker body 30a Heating coil 31 Top plate 51 Indication Control circuit 52 Display 53 Cable 54 Insulation circuit 55 Arithmetic circuit

Claims (4)

[Claims] 1. An operation display circuit of an induction heating device for inductively heating an object to be heated by a heating coil fed from a power source, a detection coil for detecting a magnetic flux generated by the heating coil, a resistor, a Zener diode and a light emitting diode. An operation display circuit for an induction heating apparatus, comprising: a display circuit having at least one set of display units connected in series; 2. The operation display circuit of the induction heating device according to claim 1, wherein the detection coil is detachable from and replaceable with the display circuit. 3. The operation display circuit of the induction heating device according to claim 1, wherein the operation display circuit is installed at the tip of a rod-shaped insulator. Display circuit. 4. The operation display circuit of the induction heating device according to claim 1, wherein the operation display circuit is incorporated in a portion of the induction heating device with which an object to be heated is brought into contact. Operation display circuit.