KR20150041020A - Control device for induction heating units - Google Patents

Abstract

A control device for an induction heating device capable of individually controlling a temperature increase amount between one side portion and another side portion of a heating target while preventing an abnormal mutual induction phenomenon between the both induction heating devices. To this end, the control device includes a master frequency control unit for setting the operating frequency of the master inverter so that the phase of the output voltage of the master inverter for driving the master C type induction heating apparatus disposed on one side of the heated material is synchronized with the phase of the output current, A slave frequency control unit for synchronizing the operating frequency of the slave inverter for driving the slave C type induction heating apparatus disposed on the other side of the heating target with the operating frequency of the master inverter; A master voltage controller for setting a pulse width of an output voltage of the master inverter and a slave voltage controller for setting a pulse width of an output voltage of the slave inverter .

Description

CONTROL DEVICE FOR INDUCTION HEATING UNITS

The present invention relates to a control apparatus for an induction heating apparatus.

There has been proposed a control device in which a pair of induction heating devices arranged in the vicinity of both sides of the heating target are connected in parallel to one power source. According to this control apparatus, the current phases of the both induction heating apparatuses are synchronized. Therefore, an abnormal mutual induction phenomenon does not occur between the two induction heating apparatuses (see, for example, Patent Document 1).

Japanese Patent No. 3156746

However, the same voltage is applied to the both-induction heating apparatus described in Patent Document 1. Therefore, the power supplied to each induction heating apparatus can not be individually controlled. That is, it is not possible to individually control the temperature increase amount between the one side portion and the other side portion of the heating target.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and an object of the present invention is to provide an apparatus and a method for separately and independently controlling a temperature rise amount of one side portion and another side portion of a heating target, And a controller for controlling the induction heating apparatus.

The control apparatus of the induction heating apparatus according to the present invention is characterized in that the operating frequency of the master inverter is controlled so that the phase of the output voltage of the master inverter for driving the master C type induction heating apparatus disposed on one side of the heating target is synchronized with the phase of the output current A slave frequency control unit for synchronizing an operating frequency of a slave inverter for driving a slave C type induction heating apparatus disposed on the other side of the heating material to an operating frequency of the master inverter; A master voltage control unit for setting a pulse width of an output voltage of the master inverter; and a slave control unit for setting a pulse width of an output voltage of the slave inverter And a voltage control unit.

According to the present invention, it is possible to individually control the amount of increase in temperature between the one side portion and the other side portion of the heating target while preventing the abnormal mutual induction phenomenon between the two induction heating devices.

1 is a perspective view of an induction heating apparatus in which a control apparatus for an induction heating apparatus according to Embodiment 1 of the present invention is used;
2 is a view of an induction heating loop of an induction heating apparatus using a control apparatus for induction heating apparatus according to Embodiment 1 of the present invention.
3 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 1 of the present invention.
4 is a diagram of a master-side circuit and a slave-side circuit used in the control apparatus of the induction heating apparatus according to the first embodiment of the present invention.
Fig. 5 is a diagram for explaining a setting procedure of the operation of the master inverter and the slave inverter used in the control apparatus of the induction heating apparatus according to the first embodiment of the present invention; Fig.
6 is a diagram showing Q values of a master side circuit and a slave side circuit of a control apparatus for an induction heating apparatus according to Embodiment 1 of the present invention.
7 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 2 of the present invention.
8 is a view for explaining the resonance frequency of the control apparatus of the induction heating apparatus according to the second embodiment of the present invention.
Fig. 9 is a diagram corresponding to Fig. 5 according to the second embodiment of the present invention. Fig.
Fig. 10 is a view corresponding to Fig. 6 according to the second embodiment of the present invention. Fig.
11 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 3 of the present invention.
Fig. 12 is a view for explaining the resonance frequency of the control apparatus of the induction heating apparatus according to the third embodiment of the present invention; Fig.
13 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 4 of the present invention.
Fig. 14 is a view corresponding to Fig. 8 in the fourth embodiment of the invention; Fig.
15 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 5 of the present invention.
Fig. 16 is a view corresponding to Fig. 12 according to the fifth embodiment of the present invention. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the redundant description thereof will be omitted or omitted as appropriate.

Embodiment Mode 1.

1 is a perspective view of an induction heating apparatus in which a control apparatus for an induction heating apparatus according to Embodiment 1 of the present invention is used.

1, the heated material 1 is supported by an inlet conveying roller 2 and an exit conveying roller 3. As shown in Fig. Both ends of the inlet conveying roller 2 and both ends of the outlet conveying roller 3 are connected to the earth 4.

A master C-type heating apparatus 5 is disposed in the vicinity of one side of the material 1 to be heated. The master C-type heating apparatus 5 includes a master-side C-type inductor 5a and a master-output C-type inductor 5b. The master input side C-type inductor 5a and the master output side C-type inductor 5b are arranged along the conveying direction of the member 1 to be heated. The master input side C-type inductor 5a and the master output side C-type inductor 5b are formed so that the magnetic flux directions are opposite to each other.

A slave C type heating device 6 is disposed near the other side of the material 1 to be heated. The slave C-type heating device 6 includes a slave-side C-type inductor 6a and a slave-side C-type inductor 6b. The slave inlet-side C-type inductor 6a and the slave-outlet C-type inductor 6b are arranged along the conveying direction of the member 1 to be heated. The slave inductor C-type inductor 6a and the slave inductor C-type inductor 6b are formed so that the magnetic flux directions are opposite to each other.

The master-side C-type inductor 5a and the slave-side C-type inductor 6a are formed so that the magnetic flux directions are opposite to each other. The master outgoing C-shaped inductor 5b and the slave outgoing C-shaped inductor 6b are formed so that the magnetic flux directions are opposite to each other.

When a current flows through the master input-side C-type inductor 5a, the input-side inductor magnetic flux is formed. The material current 7a flows through the material 1 to be heated by the input-side inductor magnetic flux. When a current flows through the master outputting C-type inductor 5b, the output inductor magnetic flux is formed. The material current 7b flows through the material 1 to be heated by the output inductor magnetic flux. One side of the heated material 1 is heated by the material currents 7a and 7b.

When a current flows through the slave inductor C-type inductor 6a, the inductor magnetic flux in the inductor is formed. The material current 7c flows through the material 1 to be heated by the inductor magnetic flux in question. When a current flows through the slave outgoing C-type inductor 6b, the outgoing inductor magnetic flux is formed. The material current 7d flows through the material 1 to be heated by the output inductor magnetic flux. The other side of the heating target 1 is heated by the material currents 7c and 7d.

At this time, the ground current 8a can flow through the heating target 1 between one end of the in-feed conveying roller 2 and the vicinity of the master inlet side C-type inductor 5a. The ground current 8b can flow through the heating target 1 between one end of the exit conveying roller 3 and the vicinity of the master outgoing C-type inductor 5b. The ground current 8c can flow through the material to be heated 1 between the other end of the feed roller 2 and the vicinity of the slave inlet C-type inductor 6a. The ground current 8d can flow through the material 1 to be heated between the other end of the outgoing conveying roller 3 and the vicinity of the slave outgoing C-type inductor 6b.

When the earth current 8a is large, an arc 9 may occur at the contact point between the one end of the in-feed roller 2 and the material 1 to be heated. When the earth current 8b is large, an arc 9 may occur at the contact point between one end of the outgoing conveying roller 3 and the material to be heated 1. [ When the earth current 8c is large, an arc 9 may be generated at the contact point between the other end of the input conveying roller 2 and the member to be heated 1. [ When the earth current 8d is large, an arc 9 may occur at the contact point between the other end of the exit conveying roller 3 and the material to be heated 1. [

Next, a method of preventing the generation of the arc 9 will be described with reference to Fig.

2 is a view of an induction heating loop of an induction heating apparatus using a control apparatus for induction heating apparatus according to Embodiment 1 of the present invention.

On the master side and the slave side, a first material loop circuit 10, a second material loop circuit 11, and an earth loop circuit 12 are formed.

The first material loop circuit 10 is made up of an inlet material resistance R1 and an inlet material end resistance R2 of the material 1 to be heated. The second material loop circuit 11 becomes the output material resistance R3 and the output end resistance R4 of the material 1 to be heated. The ground loop circuit 12 includes a grounding resistance R0, an input-side material end resistance R2, and an output-side material end resistance R4.

The input-side inductor magnetic flux? 1 penetrates through the first material loop circuit 10. By this penetration, the incoming material current 13 flows. On the other hand, the output inductor magnetic flux? 2 passes through the second material loop circuit 11. By this penetration, the output material current 14 flows.

On the other hand, in the earth loop circuit 12, the input inductor magnetic flux? 1 and the output inductor magnetic flux? 2 are in the same amount in the opposite directions. Therefore, the combined magnetic flux of the input-side inductor magnetic flux? 1 and the output inductor magnetic flux? 2 becomes zero. As a result, the ground current 15 flowing between the in-feed conveying roller 2 and the earth 4, the earth current 15 flowing through the to-be-heated material 1, and the gap between the outgoing conveying roller 3 and the earth 4 The flowing ground current 15 becomes zero. Therefore, the arc 9 is not generated. That is, there is no occurrence of an arc scratch on the surface of the entrance conveying roller 2, the surface of the exit conveying roller 3, and the surface of the material to be heated 1.

Next, a control apparatus of the induction heating apparatus will be described with reference to Fig.

3 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 1 of the present invention.

3, the voltage-type inverter power supply 16 includes a rectifier 17, a smoothing capacitor 18, a master inverter 19a, and a slave inverter 19b.

The rectifier (17) has a function of rectifying the AC power source (20). The smoothing capacitor 18 has a function of smoothing the DC voltage output from the rectifier 17. The master inverter 19a and the slave inverter 19b are connected in parallel. The master inverter 19a and the slave inverter 19b have a function of PWM control of the DC voltage smoothed by the smoothing capacitor 18. [

The voltage-type matching device 21 includes a master matching transformer 22a, a master series resonance capacitor 23a, a master current detector 24a, a master voltage detector 25a, a slave matching transformer 22b, A resonance capacitor 23b, a slave current detector 24b, and a slave voltage detector 25b.

The master matching transformer 22a is connected between the master inverter 19a and the master C-type heating apparatus 5. [ The master series resonant capacitor 23a is connected between the master matching transformer 22a and the master C type heating device 5. [ The master current detector 24a is connected between the master series resonant capacitor 23a and the master C-type heating apparatus 5. [ The master voltage detector 25a is connected between the master current detector 24a and the master C-type heater 5.

The slave matching transformer 22b is connected between the slave inverter 19b and the slave C type heating device 6. [ The slave series resonant capacitor 23b is connected between the slave matching transformer 22b and the slave C type heating device 6. [ The slave current detector 24b is connected between the slave series resonant capacitor 23b and the slave C type heating device 6. [ The slave voltage detector 25b is connected between the slave current detector 24b and the slave C type heating device 6. [

In the present embodiment, the master frequency control circuit 26, the slave frequency control circuit 27, the slave current phase control circuit 28, the master voltage control circuit 28, Circuit (master voltage control section) 29, and a slave voltage control circuit (slave voltage control section) 30 are provided.

The master frequency control circuit 26 has a function of receiving the feedback of the detection value of the master current detector 24a and the detection value of the master voltage detector 25a and setting the operation frequency of the master inverter 19a. The slave frequency control circuit 27 has a function of setting the operation frequency of the master inverter 19a set by the master frequency control circuit 26 to the operation frequency of the slave inverter 19b. The slave current phase control circuit 28 has a function of receiving the feedback of the detection value of the master current detector 24a and the detection value of the slave current detector 24b to set the phase of the output current of the slave inverter 19b .

The master voltage control circuit 29 has a function of receiving an external command and feedback of the detected value of the master voltage detector 25a to set the pulse width of the output voltage of the master inverter 19a. The slave voltage control circuit 30 has a function of receiving an external command and feedback of the detection value of the slave voltage detector 25b to set the pulse width of the output voltage of the slave inverter 19b.

Next, the operation frequencies of the master inverter 19a and the slave inverter 19b will be described with reference to Fig. 4 is a diagram of a master-side circuit and a slave-side circuit used in the control apparatus of the induction heating apparatus according to the first embodiment of the present invention.

As shown in Fig. 4, the static capacitance of the master series resonant capacitor 23a is Cm, the load resistance on the master side is Rm, and the load inductance is Lm. In this case, the resonance frequency Fm0 of the master side circuit is expressed by the following equation (1).

[Equation 1]

As shown in Fig. 4, the capacitance of the slave series resonant capacitor 23b is Cs, the load resistance on the slave side is Rs, and the load inductance is Ls. In this case, the resonance frequency Fs0 of the slave circuit is expressed by the following formula (2).

[Equation 2]

When the master inverter 19a is operated at the resonance frequency Fm0, the power factor of the master inverter 19a becomes 1. On the other hand, when the slave inverter 19b is operated at the resonance frequency Fs0, the power factor of the slave inverter 19b becomes 1.

However, normally, Fm0 and Fs0 are different. Therefore, when the master inverter 19a is operated at the resonance frequency Fm0 and the slave inverter 19b is operated at the resonance frequency Fs0, the master C-type heater 5 and the slave C- The mutual induction phenomenon occurs.

Thus, the control apparatus of the present embodiment synchronizes the operation frequency of the master inverter 19a with the operation frequency of the slave inverter.

Next, the setting procedure of the operation of the master inverter 19a and the slave inverter 19b will be described with reference to Fig.

5 is a diagram for explaining a setting procedure of operation of the master inverter and the slave inverter used in the control apparatus of the induction heating apparatus according to the first embodiment of the present invention.

The upper part of FIG. 5 is a diagram of the currents flowing in the master C-type heating device 5 and the slave C-type heating device 6. FIG. 5 is a diagram of the output voltage of the master inverter 19a. The lower end of Fig. 5 is a diagram of the output voltage of the slave inverter 19b.

First, the master frequency control circuit 26 sets the operation frequency of the master inverter 19a to the resonance frequency Fm0 so that the power factor of the master inverter 19a is 1. [ 5, the operation of the master inverter 19a is controlled so that the phase of the output voltage VIm of the master inverter 19a is synchronized with the phase of the output current (master inductor current Im) The frequency is set. As a result, the cycle time of the master side circuit is set to t0, as shown in the upper part and the middle part of Fig.

Thereafter, the slave frequency control circuit 27 sets the resonance frequency Fm0 of the master side circuit as the operation frequency of the slave inverter 19b. As a result, the cycle time of the slave circuit is also set to t0, as shown in the lower part of Fig.

5, the slave current phase control circuit 28 compares the phase of the output current (slave inductor current Is) of the slave inverter 19b with the output current of the master inverter 19a (Master inductor current Im). As a result, in the master C-type heating apparatus 5 and the slave C-type heating apparatus 6, the generation of the bit current due to the mutual induction current is suppressed. That is, in the master C-type heating apparatus 5 and the slave C-type heating apparatus 6, failure due to overcurrent flow is avoided.

Next, the Q values of the master side circuit and the slave side circuit will be described with reference to Fig.

6 is a diagram showing the Q values of the master side circuit and the slave side circuit of the control apparatus for the induction heating apparatus according to the first embodiment of the present invention.

As shown in Fig. 6, a case is considered in which the resonance frequency Fm0 of the master side circuit and the resonance frequency Fs0 of the slave side circuit are deviated from each other. In this case, the operation frequency F0 of the master inverter 19a and the slave inverter 19b is set to the resonance frequency Fm0 of the master side circuit. In this case, the Q value (Qm0) of the master side circuit becomes the maximum value on the Q value curve (Qm) of the master side circuit. Therefore, the maximum power that can be applied to the master C-type heating apparatus 5 is maintained. On the other hand, the Q value (Qs0) of the slave side circuit is not the maximum value on the Q value curve (Qs) of the slave side circuit. Therefore, the maximum power that can be applied to the slave C-type heating apparatus 6 decreases.

According to the first embodiment described above, the phase of the output current of the slave inverter 19b is synchronized with the phase of the output current of the master inverter 19a. The pulse widths of the output voltages of the master inverter 19a and the slave inverter 19b are individually set. Therefore, it is possible to individually control the temperature increase amount between the one side portion and the other side portion of the heating target 1 while preventing the abnormal mutual induction phenomenon between the two induction heating devices.

Embodiment 2:

7 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 2 of the present invention. The same or similar parts as those of the first embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The control apparatus of the second embodiment is obtained by adding the frequency synchronizing capacitor 31, the disconnecting switch 32 and the slave voltage phase control circuit 33 to the control apparatus of the first embodiment.

The slave frequency synchronous condenser 31 is connected in parallel with the slave series resonant capacitor 23b between the slave matching transformer 22b and the slave C type heating device 6. [ The disconnecting switch 32 is connected in parallel with the slave series resonant capacitor 23b and is connected in series with the slave frequency synchronous capacitor 31. [ The slave voltage phase control circuit 33 has a function of opening and closing the isolator 32 by receiving the detection value of the slave current detector 24b and the feedback of the detection value of the slave voltage detector 25b.

Next, the resonance frequency of the slave circuit will be described with reference to Fig.

8 is a diagram for explaining the resonance frequency of the control apparatus for the induction heating apparatus according to the second embodiment of the present invention.

8, the capacitance of the slave frequency synchronous condenser 31 is referred to as Css. When the disconnecting device 32 is closed, the resonance frequency Fs0 of the slave circuit is expressed by the following equation (3).

[Equation 3]

Next, the procedure of setting the operation frequency of the master inverter 19a and the slave inverter will be described with reference to Fig. Fig. 9 is an equivalent view of Fig. 5 according to the second embodiment of the present invention.

In Fig. 9, the phase of the output current of the master inverter 19a is synchronized with the phase of the output current of the slave inverter 19b, as in Fig. Thereafter, the slave voltage phase control circuit 33 synchronizes the phase of the output voltage of the slave inverter 19b with the phase of the output voltage of the master inverter 19a by opening and closing the isolator 32. [

Next, the Q value of the master side circuit and the slave side circuit will be described with reference to Fig.

Fig. 10 is an equivalent diagram of Fig. 6 according to the second embodiment of the present invention.

As shown in Fig. 10, the resonance frequency Fm0 of the master side circuit and the resonance frequency Fs0 of the slave side circuit are synchronized. In this case, the Q value (Qm0) of the master side circuit, the slave side circuit, and the Q value (Qs0) become the maximum values. Therefore, the maximum power that can be applied to the master C-type heating apparatus 5 and the slave C-type heating apparatus 6 is maintained.

According to the second embodiment described above, the phase of the output voltage of the slave inverter 19b is synchronized with the phase of the output voltage of the master inverter 19a by opening and closing the isolator 32. [ Therefore, the heating efficiency of the slave C-type heating apparatus 6 can be prevented from lowering.

Embodiment 3

11 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 3 of the present invention. The same or equivalent parts as those of the second embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The control apparatus of the third embodiment is obtained by replacing the disconnecting unit 32 of the control apparatus of the second embodiment with the slave voltage phase control unit 34.

The slave voltage phase control circuit 33 controls the voltage applied to the slave frequency synchronous condenser 31 in the slave voltage phase control device 34. As a result, the phase of the output voltage of the slave inverter 19b is synchronized with the phase of the output voltage of the master inverter 19a.

Next, the resonance frequency of the slave circuit will be described with reference to Fig. 12 is a diagram for explaining the resonance frequency of the control apparatus for the induction heating apparatus according to the third embodiment of the present invention.

In Fig. 12, by controlling the voltage applied to the slave frequency synchronous condenser 31, the resonance frequency Fs0 of the slave circuit continuously changes.

According to the third embodiment described above, it is possible to control the voltage applied to the slave frequency synchronous condenser 31 in the slave voltage phase control device 34. [ Therefore, the phase of the output voltage of the slave inverter 19b can be reliably synchronized with the phase of the output voltage of the master inverter 19a.

Embodiment 4.

13 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 4 of the present invention. The same or equivalent parts as those of the second embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The control apparatus of the second embodiment uses the slave frequency synchronous condenser 31. [ On the other hand, the control apparatus of the fourth embodiment uses the slave frequency synchronization reactor 35. [

The slave frequency synchronous reactor 35 is connected in series with the slave series resonant capacitor 23b and is connected in parallel with the slave C type heating unit 6. [ The disconnecting unit 32 is connected in series to the slave series resonant capacitor 23b and the slave frequency synchronous reactor 35 and is connected in parallel with the slave C type heating unit 6. [ The slave voltage phase control circuit 33 has a function of synchronizing the phase of the output voltage of the slave inverter 19b with the phase of the output voltage of the master inverter 19a by opening and closing the isolator 32. [

Next, the resonance frequency of the slave circuit will be described with reference to Fig. Fig. 14 is a view corresponding to Fig. 8 in the fourth embodiment of the present invention.

As shown in Fig. 14, the inductance of the slave frequency synchronous reactor 35 is referred to as Lss. When the isolator 32 is closed, the resonance frequency Fs0 of the slave circuit is expressed by the following equation (4).

[Equation 4]

According to the fourth embodiment described above, it is possible to prevent the heating efficiency of the slave C-type heater 6 from lowering as in the second embodiment.

Embodiment 5:

15 is a configuration diagram of a control apparatus for an induction heating apparatus according to Embodiment 5 of the present invention. The same or similar parts as in the third embodiment are denoted by the same reference numerals, and a description thereof will be omitted.

The control apparatus of the third embodiment uses the slave frequency synchronous condenser 31. [ On the other hand, the control apparatus of the fifth embodiment uses the slave frequency synchronization reactor 35. [

Next, the resonance frequency of the slave circuit will be described with reference to Fig. Fig. 16 is an equivalent diagram of Fig. 12 according to the fifth embodiment of the present invention.

In Fig. 16, by controlling the voltage applied to the slave frequency synchronous reactor 35, the resonance frequency Fs0 of the slave circuit continuously changes.

According to the fifth embodiment described above, the voltage applied to the slave frequency synchronous reactor 35 in the slave voltage phase control device 34 can be controlled. Therefore, the phase of the output voltage of the slave inverter 19b can be reliably synchronized with the phase of the output voltage of the master inverter 19a.

[Industrial Availability]

As described above, the control apparatus for the induction heating apparatus according to the present invention can be used for individually controlling the temperature increase amount between the one side portion and the other side portion of the heating target.

1: Heating material
2: Inlet conveying roller
3: Exit conveying roller
4: Earth
5: Master C type heating device
5a: Master Inlet C-type inductor
5b: master outgoing C-type inductor
6: Slave C type heating device
6a: Slave Inlet C-type inductor
6b: S-type inductor C type inductor
7a to 7d: Material current
8a to 8d: earth current
9: arc
10: first material loop circuit
11: second material loop circuit
12: Earth loop circuit
13, 14: Material current
15: Earth current
16: Voltage type inverter power
17: rectifier
18: Smoothing capacitor
19a: Master inverter
19b: Slave inverter
20: AC power source
21: Voltage type matching device
22a: Master matching transformer
22b: Slave matching transformer
23a: Master series resonant capacitor
23b: Slave series resonant capacitor
24a: Master current detector
24b: Slave current detector
25a: master voltage detector
25b: Slave voltage detector
26: Master frequency control circuit
27: Slave frequency control circuit
28: Slave current phase control circuit
29: Master voltage control circuit
30: Slave voltage control circuit
31: Frequency Synchronous Capacitor
32: Disconnector
33: Slave voltage phase control circuit
34: Slave voltage phase control device
35: Slave frequency synchronous reactor

Claims (6)

A master frequency controller for setting the operating frequency of the master inverter so that the phase of the output voltage of the master inverter for driving the master C type induction heating device arranged at one side of the heating target is synchronized with the phase of the output current,
A slave frequency controller for synchronizing the operating frequency of the slave inverter for driving the slave C-type induction heating device disposed on the other side of the heating material to the operating frequency of the master inverter;
A slave current phase controller for synchronizing the phase of the output current of the slave inverter with the phase of the output current of the master inverter;
A master voltage controller for setting a pulse width of an output voltage of the master inverter;
And a slave voltage controller for setting a pulse width of an output voltage of the slave inverter. The method according to claim 1,
And a slave voltage phase controller for synchronizing the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter. 3. The method of claim 2,
A slave series resonance capacitor connected between the slave C type heating device and the slave inverter,
A slave frequency synchronous capacitor connected in parallel to the slave series resonant capacitor,
And a disconnector connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronous capacitor,
Wherein the slave voltage phase control unit synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter by opening and closing the disconnecting unit. 3. The method of claim 2,
A slave series resonance capacitor connected between the slave C type heating device and the slave inverter,
A slave frequency synchronous capacitor connected in parallel to the slave series resonant capacitor,
And a slave voltage phase control device connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronous capacitor,
Wherein the slave voltage phase control unit synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter by controlling the voltage applied to the slave frequency synchronous capacitor by the slave voltage phase control unit Control device for induction heating device. 3. The method of claim 2,
A slave series resonance capacitor connected between the slave C type heating device and the slave inverter,
A slave frequency synchronous reactor connected in series with the slave series resonant capacitor and connected in parallel with the slave C type heating apparatus,
And a disconnector connected in series to the slave series resonant capacitor and the slave frequency synchronous reactor and connected in parallel with the slave C type heater,
Wherein the slave voltage phase control unit synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter by opening and closing the disconnecting unit. 3. The method of claim 2,
A slave series resonance capacitor connected between the slave C type heating device and the slave inverter,
A slave frequency synchronous reactor connected in series with the slave series resonant capacitor and connected in parallel with the slave C type heating apparatus,
And a slave voltage phase control device connected in series to the slave series resonant capacitor and the slave frequency synchronous reactor and connected in parallel with the slave C type heating device,
Wherein the slave voltage phase control unit synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter by controlling the voltage applied to the slave frequency synchronization reactor by the slave voltage phase control unit Control device for induction heating device.

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