TWI565365B - Control apparatus of induction heating apparatus - Google Patents

Description

Induction heating device control device

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

In the past, there has been proposed a control device in which an induction heating device is connected in parallel to one side of a heated material and then connected to a power source. The current phases of the two induction heating devices are synchronized by the control device. Therefore, an abnormal mutual induction phenomenon does not occur between the two induction heating devices (see, for example, Patent Document 1).

[Previous Technical Literature]

(Patent Literature)

(Patent Document 1) Japanese Patent No. 3156746

However, the two induction heating devices described in Patent Document 1 accept the application of the same voltage. Therefore, it is not possible to individually control the electric power supplied to each induction heating device. That is, the amount of temperature rise of one side portion and the other side portion of the material to be heated cannot be individually controlled.

The present invention has been made to solve the above problems, and an object thereof is to provide a phenomenon in which not only mutual anomaly mutual induction between two induction heating devices but also one side and the other side of a heated material can be individually controlled. A control device for the induction heating device of the heating amount.

The control device for the induction heating device of the present invention is provided with an output voltage of a main inverter that drives a master C-type induction heating device disposed on one side of the material to be heated. A main frequency control unit that sets the operating frequency of the main converter in synchronization with the phase of the output current; and a slave that drives the slave C-type induction heating device disposed on the other side of the heated material a slave frequency control unit that synchronizes an operating frequency of the slave inverter with an operating frequency of the main converter; synchronizes a phase of an output current of the slave converter with a phase of an output current of the main converter a slave current phase control unit; a main voltage control unit that sets a pulse width of an output voltage of the main converter; and a slave voltage control unit that sets a pulse width of an output voltage of the slave converter.

According to the present invention, not only the occurrence of abnormal mutual induction between the two induction heating devices but also the amount of temperature rise of one side portion and the other side portion of the material to be heated can be individually controlled.

1‧‧‧heated materials

2‧‧‧Inlet side conveyor roller

3‧‧‧Send side conveyor roller

4‧‧‧Ground

5‧‧‧Main C-type heating device

5a‧‧‧Main entry side C-type inductor

5b‧‧‧Main sending side C-type inductor

6‧‧‧Subordinate C-type heating device

6a‧‧‧Subordinate entry side C-type inductor

6b‧‧‧Subsidiary side C-type inductor

7a to 7d‧‧‧ material current

8a to 8d‧‧‧ Ground current

9‧‧‧Arc

10‧‧‧First material loop circuit

11‧‧‧Second material loop circuit

12‧‧‧ Ground loop circuit

13,14‧‧‧Material current

15‧‧‧ Grounding current

16‧‧‧Voltage type converter power supply

17‧‧‧Rectifier

18‧‧‧Smoothing capacitor

19a‧‧‧Main converter

19b‧‧‧Subordinate converter

20‧‧‧AC power supply

21‧‧‧Voltage type matching device

22a‧‧‧Main matching transformer

22b‧‧‧Subordinate matching transformer

23a‧‧‧Main series resonant capacitor

23b‧‧‧Subordinate series resonant capacitor

24a‧‧‧Main current detector

24b‧‧‧Subordinate current detector

25a‧‧‧ main voltage detector

25b‧‧‧Subordinate voltage detector

26‧‧‧Main frequency control circuit

27‧‧‧Subordinate frequency control circuit

28‧‧‧Subordinate current phase control circuit

29‧‧‧Main voltage control circuit

30‧‧‧Subordinate voltage control circuit

31‧‧‧Subordinate frequency synchronous capacitor

32‧‧‧Circuit breaker

33‧‧‧Subordinate voltage phase control circuit

34‧‧‧Subordinate voltage phase control device

35‧‧‧Subordinate frequency synchronous reactor

Fig. 1 is an illustration of an induction heating device according to a first embodiment of the present invention An oblique view of the induction heating device controlled by the control device.

Fig. 2 is a view showing an induction heating loop of the induction heating device under control by the control device of the induction heating device according to the first embodiment of the present invention.

Fig. 3 is a configuration diagram of a control device of the induction heating device according to the first embodiment of the present invention.

Fig. 4 is a view showing a main side circuit and a slave side circuit used in the control device of the induction heating device according to the first embodiment of the present invention.

Fig. 5 is a view for explaining a setting procedure of the operation of the main converter and the subordinate converter used in the control device of the induction heating device according to the first embodiment of the present invention.

Fig. 6 is a view showing the Q values of the main side circuit and the slave side circuit of the control device of the induction heating device according to the first embodiment of the present invention.

Fig. 7 is a view showing the configuration of a control device for an induction heating device according to a second embodiment of the present invention.

Fig. 8 is a view for explaining the resonance frequency of the control device of the induction heating device according to the second embodiment of the present invention.

Fig. 9 is a view corresponding to Fig. 5 in the second embodiment of the present invention.

Fig. 10 is a view corresponding to Fig. 6 in the second embodiment of the present invention.

Figure 11 is a configuration diagram of a control device for an induction heating device according to a third embodiment of the present invention.

Fig. 12 is a view for explaining the resonance frequency of the control device of the induction heating device according to the third embodiment of the present invention.

Figure 13 is a configuration diagram of a control device for an induction heating device according to a fourth embodiment of the present invention.

Fig. 14 is a view corresponding to Fig. 8 of the fourth embodiment of the present invention.

Fig. 15 is a view showing the configuration of a control device for an induction heating device according to a fifth embodiment of the present invention.

Fig. 16 is a view corresponding to Fig. 12 of the fifth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding components are designated by the same reference numerals, and the repeated description is simplified or omitted as appropriate.

Embodiment 1

Fig. 1 is a perspective view of an induction heating device which can be controlled by a control device of an induction heating device according to a first embodiment of the present invention.

As shown in FIG. 1, the to-be-heated material 1 is supported by the entrance side conveyance roller 2 and the delivery side conveyance roller 3. Both ends of the entry side transfer roller 2 and both end portions of the delivery side transfer roller 3 are connected to an earth 4 .

A main C-type heating device 5 is disposed in the vicinity of one side of the material to be heated 1. The main C-type heating device 5 includes a main inlet side C-type inductor 5a and a main delivery side C-type inductor 5b. The main inlet side C-type inductor 5a and the main delivery side C-type inductor 5b are arranged along the conveyance direction of the material 1 to be heated. The main entry side C-type inductor 5a and the main output side C-type inductor 5b are formed in such a manner that the magnetic flux directions of the two are opposite.

A slave C-type heating device 6 is disposed in the vicinity of the other side of the material to be heated 1. The slave C-type heating device 6 includes a slave-side C-type inductor 6a and a slave-side C-type inductor 6b. Slave entry side C The inductor 6a and the slave-side C-type inductor 6b are arranged along the conveyance direction of the material 1 to be heated. The slave-side C-type inductor 6a and the slave-side C-type inductor 6b are formed such that their magnetic flux directions are opposite.

The main entry side C-type inductor 5a and the slave entry side C-type inductor 6a are formed in such a manner that the magnetic flux directions of the two are opposite. The main delivery side C-type inductor 5b and the slave-side delivery side C-type inductor 6b are formed in such a manner that the magnetic flux directions of the two are opposite.

When current flows to the main entry side C-type inductor 5a, an ingress side inductor flux is formed. Due to the entry side inductor flux, the material current 7a is circulated in the material to be heated 1. When the current flows to the main output side C-type inductor 5b, the output side inductor magnetic flux is formed. Due to the flux of the output side inductor, the material current 7b flows in the material to be heated 1. The material currents 7a, 7b are heated to one side of the material to be heated 1.

When current flows to the slave entry side C-type inductor 6a, an ingress side inductor flux is formed. Due to the entry side inductor flux, the material current 7c is circulated in the material to be heated 1. When the current flows to the slave-side side C-type inductor 6b, the output side inductor flux is formed. Due to the flux of the output side inductor, the material current 7d is circulated in the material to be heated 1. The other side of the material to be heated 1 is heated by the material currents 7c, 7d.

At this time, a ground current 8a flows between the one end of the inlet side conveying roller 2 and the vicinity of the main inlet side C-type inductor 5a. A ground current 8b flows between the one end of the delivery side transfer roller 3 and the vicinity of the main delivery side C-type inductor 5b. At the other end of the entry side transfer roller 2 and the slave entry side C type A ground current 8c flows between the vicinity of the sensor 6a in the material 1 to be heated. A ground current 8d flows between the other end of the delivery side transfer roller 3 and the vicinity of the slave delivery side C-type inductor 6b in the material 1 to be heated.

When the ground current 8a is large, an arc 9 is generated at the contact point of the end of the inlet side conveying roller 2 with the material to be heated 1. When the ground current 8b is large, the arc 9 is generated at the contact point of the one end of the delivery-side conveying roller 3 with the material to be heated 1. When the ground current 8c is large, the arc 9 is generated at the contact point of the other end of the inlet side conveying roller 2 with the material to be heated 1. When the ground current 8d is large, an arc 9 is generated at the contact point of the other end of the delivery-side conveying roller 3 with the material to be heated 1.

Next, a method of preventing the generation of the arc 9 will be described using FIG.

Fig. 2 is a view showing an induction heating loop of the induction heating device under control by the control device of the induction heating device according to the first embodiment of the present invention.

On the primary side and the slave side, a first material loop circuit 10, a second material loop circuit 11, and a ground loop circuit 12 are formed.

The first material loop circuit 10 is composed of an entry side material resistance R1 of the material to be heated 1, and an entry side material end portion resistor R2. The second material loop circuit 11 is composed of a feed-side material resistance R3 of the material to be heated 1, and a feed-side material end resistor R4. The ground loop circuit 12 is composed of a ground resistor R0, an entry side material end resistor R2, and a feed side material end resistor R4.

In the first material loop circuit 10, there is an entry side inductor magnet The beam Φ 1 passes through. Due to this penetration, the entry side material current 13 flows. In contrast, in the second material loop circuit 11, the output side inductor magnetic flux Φ passes through. The feed-side material current 14 flows due to the penetration.

On the other hand, in the ground loop circuit 12, the amount of the input side inductor magnetic flux Φ 1 and the output side inductor magnetic flux Φ 2 are the same but opposite directions. Therefore, the combined magnetic flux of the input side inductor magnetic flux Φ 1 and the outgoing side inductor magnetic flux Φ 2 is zero. As a result, the ground current 15 flowing between the entry side transfer roller 2 and the ground line 4, the ground current 15 flowing through the heating material 1, and the ground current 15 flowing between the delivery side transfer roller 3 and the ground line 4 are zero. Therefore, the arc 9 is not generated. In other words, an arc flaw is not generated on the surface of the inlet side conveying roller 2, the surface of the delivery side conveying roller 3, and the surface of the heated material 1.

Next, the control device of the induction heating device will be described using FIG.

Fig. 3 is a configuration diagram of a control device of the induction heating device according to the first embodiment of the present invention.

In the third diagram, the voltage converter power supply 16 includes a rectifier 17, a smoothing capacitor 18, a main converter 19a, and a subordinate converter 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 main converter 19a and the subordinate converter 19b are connected in parallel. The main converter 19a and the subordinate converter 19b have a function of performing PWM control on the DC voltage smoothed by the smoothing capacitor 18.

The voltage matching device 21 includes a main matching transformer 22a, a main series resonant capacitor 23a, a main current detector 24a, a main voltage detector 25a, a slave matching transformer 22b, a slave series resonant capacitor 23b, a slave current detector 24b, and a slave. Voltage detector 25b.

The main matching transformer 22a is connected between the main converter 19a and the main C-type heating device 5. The main series resonance capacitor 23a is connected between the main matching transformer 22a and the main C-type heating device 5. The main current detector 24a is connected between the main series resonance capacitor 23a and the main C-type heating device 5. The main voltage detector 25a is connected between the main current detector 24a and the main C-type heating device 5.

The slave matching transformer 22b is connected between the slave converter 19b and the slave C-type heater 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 heater 6. The slave voltage detector 25b is connected between the slave current detector 24b and the slave C-type heater 6.

In the present embodiment, a main frequency control circuit (main frequency control unit) 26, a slave frequency control circuit (slave frequency control unit) 27, a slave current phase control circuit (slave current phase control unit) 28, and a main voltage control are provided. A circuit (main voltage control unit) 29 and a slave voltage control circuit (subordinate voltage control unit) 30.

The main frequency control circuit 26 has a function of receiving a feedback of the detected value of the main current detector 24a and the detected value of the main voltage detector 25a, and setting the operating frequency of the main converter 19a. The slave frequency control circuit 27 has a function of setting the operating frequency of the main converter 19a set by the main frequency control circuit 26 to the operating frequency of the slave converter 19b. The slave current phase control circuit 28 has a function of receiving the feedback of the detected value of the main current detector 24a and the detected value of the slave current detector 24b, and setting the phase of the output current of the slave converter 19b.

The main voltage control circuit 29 has a function of receiving a command from the outside and a feedback of the detected value of the main voltage detector 25a, and setting the pulse width of the output voltage of the main converter 19a. The slave voltage control circuit 30 has a function of receiving a command from the outside and feedback of the detected value of the slave voltage detector 25b, and setting the pulse width of the output voltage of the slave converter 19b.

Next, the operating frequency of the main converter 19a and the subordinate converter 19b will be described using FIG.

Fig. 4 is a view showing a main side circuit and a slave side circuit used in the control device of the induction heating device according to the first embodiment of the present invention.

As shown in Fig. 4, it is assumed that the capacitance of the main series resonance capacitor 23a is Cm, the load resistance of the main side is Rm, and the load inductance is Lm. In this case, the resonance frequency Fm0 of the main side circuit can be expressed by the following formula (1).

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

When the main converter 19a is operated at the resonance frequency Fm0, the power factor of the main converter 19a is 1. In contrast, when the slave converter 19b is operated at the resonance frequency Fs0, the power factor of the slave converter 19b is 1.

However, usually Fm0 and Fs0 are not the same. Therefore, the main converter 19a is operated at the resonance frequency Fm0, and the slave converter 19b is operated at the resonance frequency Fs0, and an abnormal mutual induction phenomenon occurs between the main C-type heating device 5 and the slave C-type heating device 6.

Therefore, the control device of the present embodiment synchronizes the operating frequency of the main converter 19a with the operating frequency of the subordinate converter.

Next, the setting procedure of the operation of the main converter 19a and the subordinate converter will be described using FIG.

Fig. 5 is a view for explaining a setting procedure of the operation of the main converter and the subordinate converter used in the control device of the induction heating device according to the first embodiment of the present invention.

The upper section of Figure 5 is for the main C-type heating device 5 and A diagram of the current flowing through the C-type heating device 6. The middle section of Fig. 5 is a diagram of the output voltage of the main converter 19a. The lower stage of Fig. 5 is a diagram of the output voltage of the slave converter 19b.

First, the main frequency control circuit 26 sets the operating frequency of the main converter 19a to a resonance frequency Fm0 which allows the main converter 19a to have a power factor of 1. That is, as shown in the upper and middle sections of Fig. 5, the operation of the main converter 19a is set in such a manner that the phase of the output voltage VIm of the main converter 19a is synchronized with the phase of the output current (main inductor current Im). frequency. As a result, as shown in the upper and middle sections of Fig. 5, the cycle time of the main side circuit is set to t0.

Then, the slave frequency control circuit 27 sets the operating frequency of the slave converter 19b to the resonance frequency Fm0 of the master side circuit. As a result, as shown in the lower part of Fig. 5, the cycle time of the slave side circuit is also set to t0.

Then, as shown in the upper stage of Fig. 5, the slave current phase control circuit 28 causes the phase of the output current of the slave converter 19b (the slave inductor current Is) and the output current of the main converter 19a (the main inductor current Im) Phase synchronization. As a result, the occurrence of a beat current due to mutual induction current is suppressed in the main C-type heating device 5 and the subordinate C-type heating device 6. That is, malfunctions due to the circulation of overcurrent are avoided in the main C-type heating device 5 and the subordinate C-type heating device 6.

Next, the Q value of the primary side circuit and the slave side circuit will be described using FIG.

Fig. 6 is a view showing the Q values of the main side circuit and the slave side circuit of the control device of the induction heating device according to the first embodiment of the present invention.

As shown in Fig. 6, it is considered that the resonance frequency Fm0 of the main side circuit deviates from the resonance frequency Fs0 of the slave side circuit. In this case, the operating frequency F0 of the main converter 19a and the slave converter 19b is set to the resonance frequency Fm0 of the main side circuit. At this time, the Q value Qm0 of the main side circuit is the maximum value on the Q value curve Qm of the main side circuit. Therefore, the maximum power that can be applied to the main C-type heating device 5 is maintained. On the other hand, the Q value Qs0 of the slave side circuit is the maximum value on the Q value curve Qs of the non-slave side circuit. Therefore, the maximum power system that can be applied to the slave C-type heating device 6 is reduced.

According to the first embodiment described above, the phase of the output current of the slave current transformer 19b can be synchronized with the phase of the output current of the main converter 19a. Further, the pulse widths of the output voltages of the main converter 19a and the subordinate converter 19b can be individually set. Therefore, not only the occurrence of abnormal mutual induction between the two induction heating devices but also the amount of temperature rise of one side portion and the other side portion of the material 1 to be heated can be individually controlled.

Embodiment 2

Fig. 7 is a view showing the configuration of a control device for an induction heating device according to a second embodiment of the present invention. The same or equivalent portions as those in the first embodiment are denoted by the same reference numerals and their description will be omitted.

In the control device according to the second embodiment, the frequency synchronizing capacitor 31, the circuit breaker 32, and the slave voltage phase control circuit 33 are added to the control device according to the first embodiment.

The slave frequency synchronizing capacitor 31 is connected in parallel with the slave series resonant capacitor 23b and is connected between the slave matching transformer 22b and the slave C type heating device 6. The circuit breaker 32 is connected in parallel to the slave series resonant capacitor 23b and is connected in series to the slave frequency synchronous capacitor 31. The slave voltage phase control circuit 33 has a function of receiving the feedback of the detected value of the slave current detector 24b and the detected value of the slave voltage detector 25b, and opening and closing the circuit breaker 32.

Next, the resonance frequency of the slave side circuit will be described using FIG.

Fig. 8 is a view for explaining the resonance frequency of the control device of the induction heating device according to the second embodiment of the present invention.

As shown in Fig. 8, it is assumed that the electrostatic capacitance of the slave frequency synchronizing capacitor 31 is Css. The circuit breaker 32 is closed, and the resonance frequency Fs0 of the slave side circuit can be expressed by the following equation (3).

Next, the setting procedure of the operating frequency of the main converter 19a and the subordinate converter will be described using FIG.

Fig. 9 is a view corresponding to Fig. 5 in the second embodiment of the present invention.

In Fig. 9, as in Fig. 5, the phase of the output current of the main converter 19a and the phase of the output current of the slave converter 19b are shown. Synchronize. Then, the slave voltage phase control circuit 33 causes the phase of the output voltage of the slave converter 19b to be the same as the phase of the output voltage of the main converter 19a by the opening and closing of the breaker 32.

Next, the Q value of the main side circuit and the slave side circuit will be described using FIG.

Fig. 10 is a view corresponding to Fig. 6 in the second embodiment of the present invention.

As shown in Fig. 10, the resonance frequency Fm0 of the primary side circuit is synchronized with the resonance frequency Fs0 of the slave side circuit. In this case, the Q value Qm0 of the main side circuit and the Q value Qs0 of the slave side circuit are both maximum values. Therefore, the maximum electric power that can be applied to the main C-type heating device 5 and the subordinate C-type heating device 6 is maintained.

According to the second embodiment described above, the phase of the output voltage of the slave converter 19b can be synchronized with the phase of the output voltage of the main converter 19a by the opening and closing of the breaker 32. Therefore, the decrease in the heating efficiency of the subordinate C-type heating device 6 can be prevented.

Embodiment 3

Figure 11 is a configuration diagram of a control device for an induction heating device according to a third embodiment of the present invention. The same or equivalent portions as those in the second embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The control device according to the third embodiment is configured by changing the circuit breaker 32 of the control device according to the second embodiment to the slave voltage phase control device 34.

The slave voltage phase control circuit 33 utilizes the slave voltage The phase control device 34 controls the voltage applied to the slave frequency synchronizing capacitor 31. As a result, the phase of the output voltage of the slave converter 19b is synchronized with the phase of the output voltage of the main converter 19a.

Next, the resonance frequency of the slave side circuit will be described using FIG.

Fig. 12 is a view for explaining the resonance frequency of the control device of the induction heating device according to the third embodiment of the present invention.

In Fig. 12, the resonance frequency Fs0 of the slave side circuit is continuously changed by controlling the voltage applied to the slave frequency synchronizing capacitor 31.

According to the third embodiment described above, the voltage applied to the slave frequency synchronizing capacitor 31 can be controlled by the slave voltage phase control device 34. Therefore, the phase of the output voltage of the slave converter 19b can be surely synchronized with the phase of the output voltage of the main converter 19a.

Embodiment 4

Figure 13 is a configuration diagram of a control device for an induction heating device according to a fourth embodiment of the present invention. The same or equivalent portions as those in the second embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The control device of the second embodiment uses the slave frequency synchronizing capacitor 31. The control device of the fourth embodiment utilizes a slave frequency synchronizing reactor 35.

The slave frequency synchronizing reactor 35 is connected in series to the slave series resonant capacitor 23b, and is connected in parallel to the slave C-type heating device 6. The circuit breaker 32 is connected to the slave series resonant capacitor 23b and the slave frequency synchronous power The resistors 35 are connected in series and are connected in parallel with the slave C-type heating device 6. The slave voltage phase control circuit 33 has a function of synchronizing the phase of the output voltage of the slave converter 19b with the phase of the output voltage of the main converter 19a by opening and closing the breaker 32.

Next, the resonance frequency of the slave side circuit will be described using FIG.

Fig. 14 is a view corresponding to Fig. 8 of the fourth embodiment of the present invention.

As shown in Fig. 14, it is assumed that the inductance of the slave frequency synchronizing reactor 35 is Lss. The circuit breaker 32 is closed, and the resonance frequency Fs0 of the slave side circuit can be expressed by the following equation (4).

According to the fourth embodiment described above, as in the second embodiment, the decrease in the heating efficiency of the slave C-type heating device 6 can be prevented.

Embodiment 5

Fig. 15 is a view showing the configuration of a control device for an induction heating device according to a fifth embodiment of the present invention. The same or equivalent portions as those in the third embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The control device of the third embodiment uses the slave frequency synchronizing capacitor 31. On the other hand, the control device of the fifth embodiment uses the slave frequency synchronizing reactor 35.

Next, the resonance frequency of the slave side circuit will be described using Fig. 16.

Figure 16 is a view corresponding to the 12th embodiment of the fifth embodiment of the present invention.

In Fig. 16, by controlling the voltage applied to the slave frequency synchronizing reactor 35, the resonance frequency Fs0 of the slave side circuit is continuously changed.

According to the fifth embodiment described above, the voltage applied to the slave frequency synchronizing reactor 35 can be controlled by the slave voltage phase control device 34. Therefore, the phase of the output voltage of the slave converter 19b can be surely synchronized with the phase of the output voltage of the main converter 19a.

(industrial use)

As described above, the control device for the induction heating device of the present invention can be used to individually control the temperature increase amount of one side portion and the other side portion of the material to be heated.

5‧‧‧Main C-type heating device

5a‧‧‧Main entry side C-type inductor

5b‧‧‧Main sending side C-type inductor

6‧‧‧Subordinate C-type heating device

6a‧‧‧Subordinate entry side C-type inductor

6b‧‧‧Subsidiary side C-type inductor

7a to 7d‧‧‧ material current

12‧‧‧ Ground loop circuit

16‧‧‧Voltage type converter power supply

17‧‧‧Rectifier

18‧‧‧Smoothing capacitor

19a‧‧‧Main converter

19b‧‧‧Subordinate converter

20‧‧‧AC power supply

21‧‧‧Voltage type matching device

22a‧‧‧Main matching transformer

22b‧‧‧Subordinate matching transformer

23a‧‧‧Main series resonant capacitor

23b‧‧‧Subordinate series resonant capacitor

24a‧‧‧Main current detector

24b‧‧‧Subordinate current detector

25a‧‧‧ main voltage detector

25b‧‧‧Subordinate voltage detector

26‧‧‧Main frequency control circuit

27‧‧‧Subordinate frequency control circuit

28‧‧‧Subordinate current phase control circuit

29‧‧‧Main voltage control circuit

30‧‧‧Subordinate voltage control circuit

Claims (5)

A control device for an induction heating device includes: setting a phase of an output voltage of a main converter that drives a main C-type induction heating device disposed on one side of a heated material to a phase of an output current a main frequency control unit for operating the frequency of the main converter; an operating frequency of the subordinate converter for driving the subordinate C-type induction heating device disposed on the other side of the heating material, and the main converter a slave frequency control unit for synchronizing operation frequency; a slave current phase control unit for synchronizing a phase of an output current of the slave converter with a phase of an output current of the main converter; and a pulse for setting an output voltage of the main converter a main voltage control unit having a width; a subordinate voltage control unit that sets a pulse width of an output voltage of the subordinate converter; and a phase of an output current of the slave current converter and the main converter in the slave current phase control unit After the phase of the output current is synchronized, the phase of the output voltage of the slave converter is made to be as described above. A phase converter to the output voltage of the slave synchronous voltage phase control unit. The control device for the induction heating device according to claim 1, further comprising: a connection to the slave C-type heating device and the slave converter a slave series resonant capacitor between the slave; a slave frequency synchronizing capacitor connected in parallel with the slave series resonant capacitor; and a circuit breaker connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronizing capacitor, the slave voltage phase control The phase of the output voltage of the slave converter is synchronized with the phase of the output voltage of the main converter by opening and closing the circuit breaker. The control device for the induction heating device according to claim 1, further comprising: a slave series resonant capacitor connected between the slave C-type heating device and the slave converter; and the slave series resonant capacitor a slave frequency synchronizing capacitor connected in parallel; and a slave voltage phase control device connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronizing capacitor, wherein the slave voltage phase control unit is controlled by the slave voltage phase control device The voltage applied to the aforementioned slave frequency synchronizing capacitor is thereby synchronized with the phase of the output voltage of the aforementioned main converter. The control device for the induction heating device according to claim 1, further comprising: a connection to the slave C-type heating device and the slave converter a slave series resonant capacitor; a slave frequency synchronizing reactor connected in series with the slave series resonant capacitor and connected in parallel with the slave C-type heating device; and a series connection with the slave series resonant capacitor and the slave frequency synchronizing reactor And the circuit breaker connected in parallel with the slave C-type heating device, wherein the slave voltage phase control unit sets the phase of the output voltage of the slave converter and the output of the main converter by opening and closing the circuit breaker The phase of the voltage is synchronized. The control device for the induction heating device according to claim 1, further comprising: a slave series resonant capacitor connected between the slave C-type heating device and the slave converter; and the slave series resonant capacitor a slave frequency synchronizing reactor connected in series and connected in parallel with the slave C-type heating device; and a slave voltage connected in series with the slave series resonant capacitor and the slave frequency synchronizing reactor, and connected in parallel with the slave C heater In the phase control device, the slave voltage phase control unit controls a voltage applied to the slave frequency synchronizing reactor by the slave voltage phase control device, thereby causing a phase of an output voltage of the slave converter and the main converter The phase of the output voltage of the device is synchronized.