JP5983748B2 - Control device for induction heating device - Google Patents

Description

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

  There has been proposed a control device in which a pair of induction heating devices arranged in the vicinity of both sides of a material to be heated are connected in parallel to one power source. According to the said control apparatus, the electric current phase of both induction heating apparatuses synchronizes. For this reason, an abnormal mutual induction phenomenon does not occur between both induction heating devices (for example, see Patent Document 1).

Japanese Patent No. 3156746

  However, the same voltage is applied to both induction heating devices described in Patent Document 1. For this reason, the electric power supplied to each induction heating device cannot be individually controlled. That is, it is not possible to individually control the amount of temperature rise on one side and the other side of the heated material.

  The present invention has been made to solve the above-described problems, and its object is to prevent an abnormal mutual induction phenomenon between the two induction heating devices, while preventing one side portion of the material to be heated and others. It is providing the control apparatus of the induction heating apparatus which can control the temperature rising amount with a side part separately.

The control device for the induction heating device according to the present invention is configured so that the phase of the output voltage and the phase of the output current of the master inverter that drives the master C-type heating device arranged on one side of the material to be heated are synchronized. A master frequency control unit for setting the operation frequency of the inverter, and a slave frequency control for synchronizing the operation frequency of the slave inverter that drives the slave C-type heating device disposed on the other side of the material to be heated with the operation frequency of the master inverter A slave current phase control unit that synchronizes the phase of the output current of the slave inverter with the phase of the output current of the master inverter, a master voltage control unit that sets a pulse width of the output voltage of the master inverter, and the slave and a slave voltage control unit for setting the pulse width of the inverter output voltage, the thread The slave current phase control unit synchronizes the phase of the output current of the slave inverter with the phase of the output current of the master inverter, and then synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter. And a phase control unit .

  According to the present invention, it is possible to individually control the temperature increase amounts of the one side portion and the other side portion of the material to be heated while preventing an abnormal mutual induction phenomenon from occurring between the two induction heating devices. .

It is a perspective view of the induction heating apparatus with which the control apparatus of the induction heating apparatus in Embodiment 1 of this invention is utilized. It is a figure of the induction heating loop of the induction heating apparatus using the control apparatus of the induction heating apparatus in Embodiment 1 of this invention. It is a block diagram of the control apparatus of the induction heating apparatus in Embodiment 1 of this invention. It is a figure of the master side circuit and slave side circuit which are used for the control apparatus of the induction heating apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the setting procedure of the driving | operation with a master inverter and a slave inverter used for the control apparatus of the induction heating apparatus in Embodiment 1 of this invention. It is a figure of Q value of the master side circuit and slave side circuit of the control apparatus of the induction heating apparatus in Embodiment 1 of this invention. It is a block diagram of the control apparatus of the induction heating apparatus in Embodiment 2 of this invention. It is a figure for demonstrating the resonant frequency of the control apparatus of the induction heating apparatus in Embodiment 2 of this invention. FIG. 6 is a view corresponding to FIG. 5 in Embodiment 2 of the present invention. FIG. 7 is a view corresponding to FIG. 6 in Embodiment 2 of the present invention. It is a block diagram of the control apparatus of the induction heating apparatus in Embodiment 3 of this invention. It is a figure for demonstrating the resonant frequency of the control apparatus of the induction heating apparatus in Embodiment 3 of this invention. It is a block diagram of the control apparatus of the induction heating apparatus in Embodiment 4 of this invention. FIG. 9 is a view corresponding to FIG. 8 in Embodiment 4 of the present invention. It is a block diagram of the control apparatus of the induction heating apparatus in Embodiment 5 of this invention. FIG. 13 is a view corresponding to FIG. 12 in Embodiment 5 of the present invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

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

  As shown in FIG. 1, the material to be heated 1 is supported by an entrance-side transport roller 2 and an exit-side transport roller 3. Both ends of the entrance-side transport roller 2 and both ends of the exit-side transport roller 3 are connected to the ground 4.

  A master C-type heating device 5 is disposed in the vicinity of one side of the material to be heated 1. The master C-type heating device 5 includes a master entry-side C-type inductor 5a and a master exit-side C-type inductor 5b. The master entry side C-type inductor 5a and the master exit side C-type inductor 5b are arranged along the conveying direction of the material to be heated 1. The master entry side C-type inductor 5a and the master exit side C-type inductor 5b are formed such that the directions of magnetic fluxes 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 inlet-side C-type inductor 6a and a slave outlet-side C-type inductor 6b. The slave inlet side C-type inductor 6 a and the slave outlet side C-type inductor 6 b are arranged along the conveying direction of the heated material 1. The slave inlet side C-type inductor 6a and the slave outlet side C-type inductor 6b are formed such that the directions of magnetic fluxes are opposite to each other.

  The master incoming C-type inductor 5a and the slave incoming C-type inductor 6a are formed such that the directions of magnetic fluxes are opposite to each other. The master output side C-type inductor 5b and the slave output side C-type inductor 6b are formed such that the directions of magnetic fluxes are opposite to each other.

  When a current flows through the master incoming C-type inductor 5a, an incoming inductor magnetic flux is formed. A material current 7a flows through the material 1 to be heated by the input inductor magnetic flux. When a current flows through the master output side C-type inductor 5b, an output side inductor magnetic flux is formed. A material current 7b flows in the heated material 1 due to the outgoing inductor magnetic flux. One side portion of the material to be heated 1 is heated by the material currents 7a and 7b.

  When a current flows through the slave incoming C-type inductor 6a, an incoming inductor magnetic flux is formed. A material current 7c flows through the material 1 to be heated by the input inductor magnetic flux. When a current flows through the slave output side C-type inductor 6b, an output side inductor magnetic flux is formed. 7 d of material current flows into the to-be-heated material 1 with the said output side inductor magnetic flux. The other side portion of the heated material 1 is heated by the material currents 7c and 7d.

  At this time, a ground current 8 a can flow to the material to be heated 1 between one end of the entrance-side transport roller 2 and the vicinity of the master entrance-side C-type inductor 5 a. Between the one end of the delivery-side transport roller 3 and the vicinity of the master delivery-side C-type inductor 5b, the ground current 8b can flow to the heated material 1. Between the other end of the entrance-side transport roller 2 and the vicinity of the slave entrance-side C-type inductor 6a, a ground current 8c can flow through the material 1 to be heated. Between the other end of the delivery-side transport roller 3 and the vicinity of the slave delivery-side C-type inductor 6b, the ground current 8d can flow through the heated material 1.

  When the ground current 8 a is large, an arc 9 can be generated at the contact point between the one end of the entry-side transport roller 2 and the heated material 1. When the ground current 8 b is large, an arc 9 can be generated at a contact point between one end of the delivery-side transport roller 3 and the heated material 1. When the ground current 8 c is large, an arc 9 can be generated at the contact point between the other end of the entrance-side transport roller 2 and the heated material 1. When the earth current 8d is large, an arc 9 can be generated at the contact point between the other end of the delivery-side transport roller 3 and the material 1 to be heated.

Next, a method for preventing the occurrence of the arc 9 will be described with reference to FIG.
FIG. 2 is a diagram of an induction heating loop of the induction heating device using the control device for the induction heating device according to Embodiment 1 of the present invention.

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

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

  The inductive inductor magnetic flux Φ1 passes through the first material loop circuit 10. Due to the penetration, the incoming material current 13 flows. On the other hand, the output inductor magnetic flux Φ2 passes through the second material loop circuit 11. Due to the penetration, the outgoing material current 14 flows.

  On the other hand, in the earth loop circuit 12, the input-side inductor magnetic flux Φ1 and the output-side inductor magnetic flux Φ2 have the same amount in opposite directions. For this reason, the combined magnetic flux of the input-side inductor magnetic flux Φ1 and the output-side inductor magnetic flux Φ2 becomes zero. As a result, the ground current 15 that flows between the entrance-side transport roller 2 and the ground 4, the ground current 15 that flows through the heated material 1, and the ground current 15 that flows between the exit-side transport roller 3 and the ground 4 become zero. . For this reason, the arc 9 does not occur. That is, arc flaws do not occur on the surface of the entrance-side transport roller 2, the surface of the exit-side transport roller 3, and the surface of the heated material 1.

Next, the control apparatus of the induction heating apparatus will be described with reference to FIG.
FIG. 3 is a configuration diagram of the control device for the induction heating device according to Embodiment 1 of the present invention.

  In FIG. 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 supply 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 controlling the DC voltage smoothed by the smoothing capacitor 18.

  The voltage 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 slave series resonance capacitor 23b, a slave current detector 24b, and a slave. A voltage detector 25b is provided.

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

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

  In the present embodiment, a master frequency control circuit (master 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, a master voltage control circuit ( A master voltage control unit 29 and a slave voltage control circuit (slave voltage control unit) 30 are provided.

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

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

Next, the operation frequency of the master inverter 19a and the slave inverter 19b will be described with reference to FIG.
FIG. 4 is a diagram of a master side circuit and a slave side circuit used in the control device for the induction heating apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 4, the 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).

  As shown in FIG. 4, the capacitance of the slave series resonance 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 side circuit is expressed by the following equation (2).

  If 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, Fm0 and Fs0 are usually 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, an abnormal mutual induction phenomenon occurs between the master C-type heating device 5 and the slave C-type heating device 6.

  Therefore, the control device 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.
FIG. 5 is a diagram for explaining a procedure for setting the operation of the master inverter and the slave inverter used in the control device for the induction heating device according to Embodiment 1 of the present invention.

  The upper part of FIG. 5 is a diagram of current flowing through the master C-type heating device 5 and the slave C-type heating device 6. The middle part of FIG. 5 is a diagram of the output voltage of the master inverter 19a. The lower part 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 becomes 1. That is, as shown in the upper and middle stages of FIG. 5, the operating frequency of the master inverter 19a is set so that the phase of the output voltage VIm of the master inverter 19a and the phase of the output current (master inductor current Im) are synchronized. . As a result, as shown in the upper and middle stages of FIG. 5, the cycle time of the master side circuit is set to t0.

  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, as shown in the lower part of FIG. 5, the cycle time of the slave side circuit is also set to t0.

  Thereafter, as shown in the upper part of FIG. 5, the slave current phase control circuit 28 synchronizes the phase of the output current of the slave inverter 19b (slave inductor current Is) with the phase of the output current of the master inverter 19a (master inductor current Im). Let As a result, in the master C-type heating device 5 and the slave C-type heating device 6, the generation of beat current due to the mutual induction current is suppressed. That is, in the master C-type heating device 5 and the slave C-type heating device 6, a failure due to an overcurrent flowing is avoided.

Next, the Q values of the master side circuit and the slave side circuit will be described with reference to FIG.
FIG. 6 is a diagram of Q values of the master side circuit and the slave side circuit of the control device for the induction heating apparatus according to Embodiment 1 of the present invention.

  Consider the case where the resonance frequency Fm0 of the master side circuit and the resonance frequency Fs0 of the slave side circuit are shifted as shown in FIG. In this case, the operating 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 is the maximum value on the Q value curve Qm of the master side circuit. For this reason, the maximum power that can be applied to the master C-type heating device 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. For this reason, the maximum power 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 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. For this reason, it is possible to individually control the temperature increase amounts of the one side portion and the other side portion of the heated material 1 while preventing the occurrence of abnormal mutual induction phenomenon between the two induction heating devices.

Embodiment 2. FIG.
FIG. 7 is a block diagram of a control device for an induction heating device according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to Embodiment 1 and an equivalent part, and description is abbreviate | omitted.

  The control device of the second embodiment is obtained by adding a frequency synchronization capacitor 31, a disconnector 32, and a slave voltage phase control circuit 33 to the control device of the first embodiment.

  The slave frequency synchronization capacitor 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 disconnector 32 is connected in parallel with the slave series resonance capacitor 23 b and is connected in series with the slave frequency synchronization capacitor 31. The slave voltage phase control circuit 33 has a function of opening and closing the disconnector 32 in response to feedback of the detection value of the slave current detector 24b and the detection value of the slave voltage detector 25b.

Next, the resonance frequency of the slave side circuit will be described with reference to FIG.
FIG. 8 is a diagram for explaining the resonance frequency of the control device for the induction heating device according to Embodiment 2 of the present invention.

  As shown in FIG. 8, the capacitance of the slave frequency synchronization capacitor 31 is Css. When the disconnector 32 is closed, the resonance frequency Fs0 of the slave side circuit is expressed by the following equation (3).

Next, the setting procedure of the operating frequency of the master inverter 19a and the slave inverter will be described with reference to FIG.
FIG. 9 is a view corresponding to FIG. 5 in the second embodiment of the present invention.

  In FIG. 9, similarly to FIG. 5, the phase of the output current of the master inverter 19a and the phase of the output current of the slave inverter 19b are synchronized. 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 disconnector 32.

Next, the Q values of the master side circuit and the slave side circuit will be described with reference to FIG.
FIG. 10 is a view corresponding to FIG. 6 in Embodiment 2 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 are maximum values. For this reason, the maximum power that can be applied to the master C-type heating device 5 and the slave C-type heating device 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 disconnector 32. For this reason, the fall of the heating efficiency of the slave C type | mold heating apparatus 6 can be prevented.

Embodiment 3 FIG.
FIG. 11 is a block diagram of a control device for an induction heating device according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2, or an equivalent, and description is abbreviate | omitted.

  In the control device of the third embodiment, the disconnector 32 of the control device of the second embodiment is changed to a slave voltage phase control device 34.

  The slave voltage phase control circuit 33 controls the voltage applied to the slave frequency synchronization capacitor 31 by the slave voltage phase control device 34. As a result, the phase of the output voltage of the slave inverter 19b and the phase of the output voltage of the master inverter 19a are synchronized.

Next, the resonance frequency of the slave side circuit will be described with reference to FIG.
FIG. 12 is a diagram for explaining the resonance frequency of the control device for the induction heating device according to Embodiment 3 of the present invention.

  In FIG. 12, by controlling the voltage applied to the slave frequency synchronization capacitor 31, the resonance frequency Fs0 of the slave side circuit changes continuously.

  According to the third embodiment described above, the voltage applied to the slave frequency synchronization capacitor 31 can be controlled by the slave voltage phase control device 34. For this reason, 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 FIG.
FIG. 13 is a configuration diagram of a control device for an induction heating device according to Embodiment 4 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2, or an equivalent, and description is abbreviate | omitted.

  The control device according to the second embodiment uses the slave frequency synchronization capacitor 31. On the other hand, the control device of the fourth embodiment uses the slave frequency synchronization reactor 35.

  The slave frequency synchronization reactor 35 is connected in series with the slave series resonance capacitor 23 b and is connected in parallel with the slave C-type heating device 6. The disconnector 32 is connected in series to the slave series resonance capacitor 23 b and the slave frequency synchronization reactor 35, and is connected in parallel to 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 inverter 19b with the phase of the output voltage of the master inverter 19a by opening and closing the disconnector 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 Embodiment 4 of the present invention.

  As shown in FIG. 14, the inductance of the slave frequency synchronization reactor 35 is Lss. When the disconnector 32 is closed, the resonance frequency Fs0 of the slave side circuit is expressed by the following equation (4).

  According to the fourth embodiment described above, similarly to the second embodiment, it is possible to prevent a decrease in the heating efficiency of the slave C-type heating device 6.

Embodiment 5. FIG.
FIG. 15 is a configuration diagram of a control device for an induction heating device according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 3, or an equivalent part, and description is abbreviate | omitted.

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

Next, the resonance frequency of the slave side circuit will be described with reference to FIG.
FIG. 16 is a view corresponding to FIG. 12 in Embodiment 5 of the present invention.

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

  According to the fifth embodiment described above, the voltage applied to the slave frequency synchronization reactor 35 can be controlled by the slave voltage phase control device 34. For this reason, 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.

  As described above, the control device for the induction heating device according to the present invention can be used when individually controlling the temperature rise amounts of the one side portion and the other side portion of the heated material.

1 Heated material, 2 Entry-side transport roller, 3 Out-side transport roller, 4 Ground,
5 Master C type heating device, 5a Master entry side C type inductor,
5b Master outlet side C type inductor 6 Slave C type heating device,
6a Slave input side C type inductor, 6b Slave output side C type inductor,
7a-7d material current, 8a-8d earth current, 9 arc,
10 first material loop circuit, 11 second material loop circuit, 12 earth loop circuit,
13, 14 Material current, 15 Ground current, 16 Voltage type inverter power supply,
17 rectifier, 18 smoothing capacitor, 19a master inverter,
19b Slave inverter, 20 AC power supply, 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 synchronization reactor

Claims (5)

A master frequency control unit that sets an operation frequency of the master inverter so that the phase of the output voltage of the master inverter that drives the master C-type heating device disposed on one side of the material to be heated is synchronized with the phase of the output current; ,
A slave frequency controller that synchronizes the operating frequency of the slave inverter that drives the slave C-type heating device disposed on the other side of the material to be heated with the operating frequency of the master inverter;
A slave current phase controller that synchronizes the phase of the output current of the slave inverter with the phase of the output current of the master inverter;
A master voltage control unit for setting a pulse width of the output voltage of the master inverter;
A slave voltage control unit for setting a pulse width of the output voltage of the slave inverter;
A slave that synchronizes the phase of the output voltage of the slave inverter with the phase of the output voltage of the master inverter after the slave current phase control unit synchronizes the phase of the output current of the slave inverter with the phase of the output current of the master inverter A voltage phase control unit;
A control device for an induction heating device, comprising: A slave series resonant capacitor connected between the slave C-type heating device and the slave inverter;
A slave frequency synchronization capacitor connected in parallel with the slave series resonant capacitor;
A disconnector connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronization capacitor;
With
2. The control of the induction heating apparatus according to claim 1 , 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 disconnector. 3. apparatus. A slave series resonant capacitor connected between the slave C-type heating device and the slave inverter;
A slave frequency synchronization capacitor connected in parallel with the slave series resonant capacitor;
A slave voltage phase control device connected in parallel with the slave series resonant capacitor and connected in series with the slave frequency synchronization capacitor;
With
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 capacitor by the slave voltage phase control device. The control apparatus of the induction heating apparatus according to claim 1 , wherein A slave series resonant capacitor connected between the slave C-type heating device and the slave inverter;
A slave frequency synchronization reactor connected in series with the slave series resonant capacitor and connected in parallel with the slave C-type heating device;
A disconnector connected in series with the slave series resonant capacitor and the slave frequency synchronous reactor, and connected in parallel with the slave C-type heating device;
With
2. The control of the induction heating apparatus according to claim 1 , 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 disconnector. 3. apparatus. A slave series resonant capacitor connected between the slave C-type heating device and the slave inverter;
A slave frequency synchronization reactor connected in series with the slave series resonant capacitor and connected in parallel with the slave C-type heating device;
A slave voltage phase controller connected in series with the slave series resonant capacitor and the slave frequency synchronous reactor, and connected in parallel with the slave C-type heating device;
With
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 device. The control apparatus of the induction heating apparatus according to claim 1 , wherein

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