JP3195596B2 - Heating heater controller for induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated heater control device for an induction heating cooker, and more particularly to an insulated heater control device for driving an insulated heater with half-wave alternating current.

[0002]

2. Description of the Related Art An induction heating cooker performs a rice cooking function in such a manner that an eddy current flows when magnetic lines of force generated from a working coil pass through a pot, so that the pot itself is heated. In addition, the induction heating cooker is provided with a heater used as a heating source at the time of the "warming" operation, in addition to the working coil. The heater includes a side heater mounted on the side of the pan and a top heater mounted on the top of the pan. That is, since the induction heating cooker requires a very high output during the process of “cooking rice”, the working coil is driven at the maximum output together with the heater. And in the "warming" process,
Mostly, the pot is heated at the output of the heater to maintain the rice at a constant temperature.

FIG. 1 shows a conventional heater control device for an induction heating cooker. In the conventional heater control device for an induction heating cooker, rectifiers 20 are connected to both sides of an AC power supply 10. The rectifier 20 rectifies the input AC power and outputs a DC power of a predetermined size. The output of the rectifier 20 is applied to a working coil 25. The working coil 25 is driven by a high-frequency voltage applied when driving the inverter element Q1. A resonance capacitor C2 is provided between both terminals of the working coil 25. Further, a capacitor C1 is provided between both output terminals of the rectifier 20. A diode D1 is connected between the working coil 25 and the ground potential.

A primary side of a low-voltage transformer 15 is connected to both sides of the AC power supply 10. The voltage S1 induced from the secondary side of the low-voltage transformer 15 is
Supplied to Further, another voltage S2 induced on the secondary side of the low-voltage transformer 15 is supplied to the microcomputer 35. The inverter circuit 30 connects a ground potential to a terminal connected to the working coil 25, and controls a turn-on time of the inverter element Q1.

Therefore, when the power supply is supplied to the microcomputer 35 by the second voltage S2 generated from the low-voltage transformer 15, the inverter circuit 3 is controlled under the control of the microcomputer 35.
0 is driven. When the inverter circuit 30 is driven, the inverter element Q1 generates a high-frequency voltage at a constant duty ratio to drive the working coil 25.

[0006] The conventional heater control device includes a heater 40 connected to both terminals of the AC power supply 10. The drive control of the heat retention heater 40 is performed by the microcomputer 35. The microcomputer 35 controls the operation of the warming heater 40 by a photocoupler 45 including a photodiode and a phototriac.

[0007] In the conventional thermal insulation heater control device configured as described above, the power circuit section 50 including the working coil 25 and the ground of the inverter circuit are shared, and the microcomputer 35 uses a power supply separated by a low-voltage transformer. That is, in the conventional heater control device, the power supply is separated between the microcomputer 35 and the heater 40 by the photocoupler 45. Therefore,
The operation of the heat retaining heater 40 is performed by controlling the operation of the photocoupler 45 by the microcomputer 35. As described above, in the conventional thermal insulation heater control device, the microcomputer 35 cannot directly control the thermal insulation heater 40 because
This is because the warming heater 40 is directly connected to both ends of the high AC power supply 10.

Therefore, the conventional heater control device is
The only alternative is to separate the power supply between the microcomputer 35 and the heater 40 by the photocoupler 45. Therefore, since the conventional heater control device uses an expensive photocoupler, there is a problem that the manufacturing cost is increased. Further, in the conventional heater control device, the microcomputer 35 and the heater 140 are not electrically connected. That is, the microcomputer indirectly controls the insulated heater by the photocoupler, and such a control method sometimes causes inaccurate control.

[0009]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a heater control device for an induction heating cooker in which a heater can be directly controlled. It is another object of the present invention to provide a heater control device for an induction heating cooker that can drive the heater with an AC half-wave.

[0010]

In order to achieve the above object, an apparatus for controlling an insulated heater of an induction heating cooker according to the present invention comprises an insulated heater connected to one terminal of an AC power supply, and one side of the insulated heater. and the connected incubated heater driving means between the ground terminal includes a control means for controlling the operation of said heat insulating heater driving means, said control
One side terminal of the means and the ground side terminal of the heating heater driving means
A ground terminal of a bridge rectifier circuit for rectifying the AC power.
It is characterized by being connected to a child.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an apparatus for controlling an insulated heater of an induction heating cooker according to the present invention. FIG. 2 is a configuration diagram of a heat retention heater control device of the induction heating cooker according to the present invention. As shown in FIG. 2, the rectifier 120 is connected to both ends of the AC power supply 110 in the heat retention heater control device of the present invention. A working coil 125 is connected to one output terminal of the rectifier 120. The other output terminal of the rectifier 120 is connected to the ground potential B. A first capacitor C1 'is connected between the output terminal of the rectifier 120 and the ground potential B. A resonance capacitor C2 'is connected to both terminals of the working coil 125, and a diode D1' is connected between one side of the working coil 125 and the ground potential B. The working coil 125 is driven by receiving a high voltage by driving the inverter element Q1 '.

Both sides of the AC power supply 110 are connected to both terminals on the primary side of a low-voltage transformer 115. The first power supply S1 'guided to the secondary side of the low-voltage transformer 115 is supplied to the inverter circuit 130. The inverter circuit 130
Performs control for driving the inverter element Q1. Further, the second power supply S2 ′ guided to the secondary side of the low-voltage transformer 115 is supplied to the microcomputer 135. Then, in the heat retaining heater control device of the present invention, the ground potential of the inverter circuit 120 and the microcomputer 135 is commonly connected to the ground potential B of the power circuit section 150.

[0013]

[Outside 1]

Next, the operation of the heater control device for an induction heating cooker according to the present invention having the above-described structure will be described. First, the power circuit unit 150 includes the rectifying unit 1.
It is driven by a DC power supply rectified at 20. And
The inverter circuit 130 is driven by the first voltage S1 'induced on the secondary side of the low-voltage transformer 115, and drives the switching element Q1' of the power circuit unit 150. By such an operation, the switching element Q
A high voltage is applied to the working coil 125 while the 1 'is turned on / off. The microcomputer 135 applies a signal to the gate terminal G of the triac PC1 when the heat retention heater 140 needs to be driven. Thereafter, a current path from the connection point A to the ground potential B is formed through the triac PC1, and power is supplied to the heat retaining heater 140. At this time, the heat retaining heater 140 is driven by a half-wave power supply between the connection point A and the ground potential B to perform a heat retaining operation of the cooking device.

[0015]

[Outside 2]

In the embodiment of the present invention, the operation of the heat retaining heater 140 is controlled directly by the microcomputer 135 using the triac PC1, which is an electric element. However, it can be electrically connected between the microcomputer 135 and the warming heater 140,
If the ground end of 0 can be connected to the microcomputer 135 in common, other electric elements of the triac can be used.

[0017]

As described above, the heating heater control device for an induction heating cooker according to the present invention comprises a heating heater which can be driven by an AC half-wave. Further, the control of the heat retention heater of the present invention can be directly performed electrically by a microcomputer using a triac which is an electric element. Therefore, by controlling the insulated heater using an inexpensive electric triac, manufacturing costs could be reduced. In addition, since the heater can be directly controlled by controlling the electric element, the control accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional heater control device for an induction heating cooker.

FIG. 2 is a configuration diagram of a heat retention heater control device of the induction heating cooker according to the present invention.

[Explanation of symbols]

 10, 110: AC power supply 15, 115: Low-voltage transformer 20, 120: Rectifying unit 25, 125: Working coil 30, 130: Inverter circuit 35, 135 ... Microcomputer 40, 140 ... Heating heater 50, 150 ... Power circuit unit C1 , C2, C1 ', C2' ... capacitors D1, D1 '... diodes Q1, Q1' ... inverter elements

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05B 6/12 H05B 11/00

Claims (5)

(57) [Claims] 1. An insulated heater connected to one terminal of an AC power supply, an insulated heater driving means connected between one side of the insulated heater and a ground terminal, and an operation of the insulated heater driving means. Controlling means for controlling an insulated heater of an induction heating cooker , comprising:
One side terminal of the means and the ground side terminal of the heating heater driving means
A ground terminal of a bridge rectifier circuit for rectifying the AC power.
Insulated heating cooker characterized by being connected to a child
Controller. 2. The apparatus according to claim 1, wherein the heater is driven by an AC half-wave. 3. The insulated heater of the induction heating cooker according to claim 1, wherein a ground terminal of the control means is used in common with a ground terminal connected to the insulated heater driving means. Control device. 4. A power circuit unit having a working coil for generating induction heat, and an inverter circuit for driving the working coil, wherein the power circuit unit and a ground terminal of the inverter circuit unit are connected to each other. Characterized by being used in common with the ground terminal of the control means,
The heater control device of the induction heating cooker according to claim 3. 5. The heater control device for an induction heating cooker according to claim 4, wherein the heat heater driving means uses a triac which is an electric element.