CN110708779A - Dual-frequency induction heating power supply and control method thereof - Google Patents
Dual-frequency induction heating power supply and control method thereof Download PDFInfo
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- CN110708779A CN110708779A CN201911053330.6A CN201911053330A CN110708779A CN 110708779 A CN110708779 A CN 110708779A CN 201911053330 A CN201911053330 A CN 201911053330A CN 110708779 A CN110708779 A CN 110708779A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/04—Sources of current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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Abstract
The present disclosure relates to a dual frequency induction heating power supply and a control method thereof, including: the controller is connected with the control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, when the controller controls the conduction of a certain pair of the thyristors, and after the zero-crossing detection circuit detects that the voltage of the alternating current output by the conduction of the pair of the thyristors is at a first zero-crossing point, the other pair of the thyristors is triggered to be conducted, so that the single-phase full-bridge inverter circuit can output the alternating current comprising the superaudio resonant current and the intermediate-frequency resonant current component to realize the dual-frequency induction heating of the thyristors, so as to meet the requirement of high-power heating application scenes.
Description
Technical Field
The disclosure relates to the technical field of heating power supplies, in particular to a dual-frequency induction heating power supply and a control method thereof.
Background
In the field of high-power induction heating, a thyristor induction heating power supply is a preferred scheme of various manufacturers due to the advantages of high single-machine power, strong overload capacity, stable and reliable operation, low cost and the like. With the technical innovation of the steel industry, more and more high-power online heating needs high-power induction heating to be realized, and especially in the heating field of thin plates and the like, the requirements of index parameters such as heating efficiency, temperature uniformity, heating speed and the like can be met only by double-frequency simultaneous induction heating of superaudio induction heating and medium-frequency induction heating.
However, the thyristor induction heating power supply in the prior art only has one frequency output, and when a common fast thyristor is assembled, the frequency of stable operation of the induction power supply generally does not exceed 2500Hz, and when a high-frequency thyristor is assembled, the frequency of stable operation of the induction power supply does not exceed 6000Hz, and the single machine power is low, so that the thyristor induction heating power supply in the prior art cannot be used in the field of high-power induction heating, especially in the occasion of superaudio (about 10 kHz) induction heating.
Disclosure of Invention
An object of the present disclosure is to provide a dual frequency induction heating power supply and a control method thereof.
In order to achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided a dual frequency induction heating power supply including: a three-phase full-bridge rectifying circuit, a smoothing reactor, a single-phase full-bridge inverter circuit, a resonant capacitor and a heating coil, the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises a first thyristor positioned on the upper arm and a second thyristor positioned on the lower arm, the second inversion bridge arm comprises a third thyristor positioned on the upper arm and a fourth thyristor positioned on the lower arm, wherein the first thyristor and the fourth thyristor are a pair of transistors, the second thyristor and the third thyristor are a pair of transistors, the positive output end of the three-phase full-bridge rectifying circuit is connected with the smoothing reactor, the anode of the first thyristor and the anode of the third thyristor, the cathode of the second thyristor and the cathode of the fourth thyristor are connected with the output negative end of the three-phase full-bridge rectifying circuit; the resonant capacitor and the heating coil are connected in parallel to a connection point of the first thyristor and the second thyristor and a connection point of the third thyristor and the fourth thyristor, and the resonant capacitor and the heating coil further comprise: a controller and a zero-crossing detection circuit,
the controller is respectively connected with the control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, the zero-crossing detection circuit is connected with the resonant capacitor in parallel, the controller is used for controlling the conduction of a pair of transistors in the first inverter bridge arm and the second inverter bridge arm and determining that the zero-crossing detection circuit detects that the voltage of alternating current output by the single-phase full-bridge inverter circuit is at a first zero-crossing point for a plurality of times, the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm are triggered to be conducted, and the single-phase inverter full-bridge circuit outputs alternating current comprising super-audio frequency resonant current and intermediate-frequency resonant current components.
Optionally, the controlling the conduction of one pair of transistors in the first inverter bridge arm and the second inverter bridge arm and the triggering of the conduction of the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm after the zero-cross detection circuit detects that the alternating current output by the single-phase full-bridge inverter circuit crosses zero for the first number of times includes:
the controller is used for triggering the conduction of the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm after the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is at the second zero-crossing point and before the third zero-crossing point.
Optionally, the power supply further comprises a transformer, one incoming line end of the primary side of the transformer is connected to a connection point of the first thyristor and the second thyristor, the other incoming line end of the primary side of the transformer is connected to a connection point of the third thyristor and the fourth thyristor, and a secondary outgoing line end of the transformer is connected in parallel to the zero-crossing detection circuit, the resonant capacitor and the heating coil.
Optionally, a first commutation inductor and a second commutation inductor are connected in series between the first thyristor and the second thyristor, a third commutation inductor and a fourth commutation inductor are connected in series between the third thyristor and the fourth thyristor, a connection point of the first commutation inductor and the second commutation inductor is connected to one line inlet end of the primary side of the transformer, and a connection point of the third commutation inductor and the fourth commutation inductor is connected to the other line inlet end of the primary side of the transformer.
According to a second aspect of the embodiments of the present disclosure, there is provided a control method of a dual-frequency induction heating power supply, applied to a dual-frequency induction heating power supply, where the induction heating power supply includes a controller, a three-phase full-bridge rectification circuit, a smoothing reactor, a single-phase full-bridge inverter circuit, a zero-cross detection circuit, a resonant capacitor, and a heating coil; the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises a first thyristor positioned on an upper arm and a second thyristor positioned on a lower arm, the second inverter bridge arm comprises a third thyristor positioned on the upper arm and a fourth thyristor positioned on the lower arm, the positive output end of the three-phase full-bridge rectifier circuit is connected with the smoothing reactor, the anode of the first thyristor and the anode of the third thyristor, and the cathode of the second thyristor and the cathode of the fourth thyristor are connected with the negative output end of the three-phase full-bridge rectifier circuit; the first thyristor and the fourth thyristor are a pair of transistors, and the second thyristor and the third thyristor are a pair of transistors; the resonant capacitor and the heating coil are connected in parallel to connection points of the first thyristor and the second thyristor, and the third thyristor and the fourth thyristor, the controller is respectively connected with control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor, and the zero-cross detection circuit, and the method comprises the following steps:
controlling one pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted;
and determining that the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is after the second zero-crossing point and before the third zero-crossing point, triggering the conduction of another pair of transistors in the first inverter bridge arm and the second inverter bridge arm, and outputting the alternating current comprising the ultrasonic frequency resonance current and the medium-frequency resonance current component by the single-phase full-bridge inverter circuit.
Through the technical scheme, the double-frequency induction heating power supply comprises a controller, a zero-crossing detection circuit, a three-phase full-bridge rectification circuit, a smoothing reactor, a single-phase full-bridge inverter circuit, a resonant capacitor and a heating coil, wherein the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises an upper tube first thyristor and a lower tube second thyristor, the second inverter bridge arm comprises an upper tube third thyristor and a lower tube fourth thyristor, the first thyristor and the fourth thyristor are a pair of tubes, the second thyristor and the third thyristor are a pair of tubes, the controller is connected with control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, when the controller controls the conduction of one pair of the first inverter bridge arm and the second inverter bridge arm, and after the zero-crossing detection circuit detects that the voltage of alternating current output by the conduction of the pair of tubes crosses zero-crossings for the first time, and triggering the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted, so that the single-phase full-bridge inverter circuit can output alternating current comprising the superaudio resonant current and the medium-frequency resonant current component, thereby realizing the dual-frequency induction heating of the thyristor and meeting the requirement of a high-power heating application scene.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic diagram of a prior art thyristor induction heating power supply;
FIG. 2 is a schematic diagram illustrating a dual frequency induction heating power supply in accordance with an exemplary embodiment;
FIG. 3 is a waveform illustrating parameters associated with a dual frequency induction heating power supply in accordance with an exemplary embodiment;
fig. 4 is a schematic diagram of another dual frequency induction heating power supply according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before the present disclosure is explained in detail, an application scenario of the present disclosure will be explained first.
Schematic diagram of thyristor induction heating power among the prior art is shown in fig. 1, mainly include three-phase full-bridge rectifier circuit 1, smoothing reactor 2, single-phase full-bridge inverter circuit 3, resonant capacitor 4 and heating coil 5, three-phase full-bridge rectifier circuit 1 includes that KP1 ~ KP6 is total to 6 thyristors and constitutes, single-phase full-bridge inverter circuit 3 includes that KK1 ~ KK4 are total to 4 thyristors and constitutes, fig. 1(a) is the thyristor induction heating power that resonant capacitor 4 and heating coil 5 series connection constitute, fig. 1(b) is the thyristor induction heating power that resonant capacitor 4 and heating coil 5 parallel connection constitute. The heating frequency of the thyristor induction heating power supply shown in fig. 1(a) and (b) is only one, and the heating frequency of fig. 1(a) is slightly lower than the resonance frequency of the heating power supply, if the heating frequency is close to the resonance frequency, the thyristor of the single-phase full-bridge inverter circuit cannot be turned off, and the circuit is short-circuited. The operating frequency of the thyristor induction heating power supply of fig. 1(b) is slightly higher than the resonant frequency of the heating power supply, and if the heating frequency approaches the resonant frequency, the thyristor of the single-phase full-bridge inverter circuit cannot be turned off, and the circuit is short-circuited.
In addition, the thyristor induction heating power supply shown in fig. 1 has a stable working frequency of no more than 2500Hz when an ordinary fast thyristor is assembled, and a stable running frequency of the induction heating power supply does not exceed 6000Hz when a high-frequency thyristor is assembled, and has a small single-machine power, so that the thyristor induction heating power supply in the prior art cannot be used in the field of high-power induction heating, especially in the occasion of needing superaudio (about 10 kHz) induction heating.
In order to solve the problem that the traditional thyristor induction heating power supply can only output one heating frequency and cannot meet the application of high-power double-frequency induction heating in the prior art, the disclosure provides a double-frequency induction heating power supply and a control method thereof, the double-frequency induction heating power supply comprises a controller, a zero-crossing detection circuit, a three-phase full-bridge rectifying circuit, a smoothing reactor, a single-phase full-bridge inverter circuit, a resonant capacitor and a heating coil, the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises an upper pipe first thyristor and a lower pipe second thyristor, the second inverter bridge arm comprises an upper pipe third thyristor and a lower pipe fourth thyristor, wherein the first thyristor and the fourth thyristor are a pair of pipes, the second thyristor and the third thyristor are a pair of pipes, the controller is connected with the control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, when the controller controls one pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted, and after the zero-crossing detection circuit detects that the voltage of the alternating current output by the pair of transistors after being conducted is at a zero-crossing point for a plurality of times, the controller triggers the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted, so that the single-phase full-bridge inverter circuit can output the alternating current comprising the super-audio resonant current and the medium-frequency resonant current component, the dual-frequency induction heating of the thyristor is realized, and the requirement of a high-power heating application scene is met.
The following is a detailed description of the present disclosure.
Fig. 2 is a schematic diagram illustrating a dual frequency induction heating power supply according to an exemplary embodiment, as shown in fig. 2, the double-frequency induction heating power supply comprises a three-phase full-bridge rectifying circuit 21, a smoothing reactor 22, a single-phase full-bridge inverter circuit 23, a resonant capacitor 24 and a heating coil 25, the single-phase full-bridge inverter circuit 23 includes a first inverter leg and a second inverter leg connected in parallel, the first inverter leg comprises a first thyristor K1 located in the upper arm and a second thyristor K2 located in the lower arm, the second inverter leg comprises a third thyristor K3 located in the upper arm and a fourth thyristor K4 located in the lower arm, the positive output terminal of the three-phase full-bridge rectification circuit 21 is connected with the smoothing reactor 22, the first thyristor K1 and the anode of the third thyristor K3, the cathode of the second thyristor K2 and the cathode of the fourth thyristor K4 are connected to the output negative terminal of the three-phase full-bridge rectification circuit 21; the resonant capacitor 24 and the heating coil 25 are connected in parallel to a connection point of the first thyristor K1 and the second thyristor K2 and a connection point of the third thyristor K3 and the fourth thyristor K4, and the dual-frequency induction heating power supply further includes: a controller 26 and a zero-crossing detection circuit 27;
the controller 26 is connected to the control ends of the first thyristor K1, the second thyristor K2, the third thyristor K3, the fourth thyristor K4, and the zero-cross detection circuit 27, the zero-cross detection circuit 27 is connected in parallel to the resonant capacitor 24, the controller 26 is configured to control conduction of one pair of transistors among the first inverter bridge arm and the second inverter bridge arm, and after determining that the zero-cross detection circuit 27 detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit 23 is at a first zero-crossing point, trigger conduction of the other pair of transistors among the first inverter bridge arm and the second inverter bridge arm, and the single-phase full-bridge inverter circuit 23 outputs an alternating current including a super-audio frequency resonant current and an intermediate-frequency resonant current component;
the first thyristor K1 and the fourth thyristor K4 are a pair of transistors, and the second thyristor K2 and the third thyristor K3 are a pair of transistors.
In this embodiment, when the controller controls one pair of the first inverter leg and the second inverter leg to be conducted, for example, one pair of the first thyristor K1 and the fourth thyristor K4 is conducted, and an alternating current oscillating up and down at a zero point is output through the first thyristor K1 and the fourth thyristor K4, where the alternating current oscillates continuously and the amplitude of the alternating current increases gradually. The zero-crossing detection circuit can detect whether the voltage of the alternating current crosses zero, before the voltage of the alternating current crosses zero for the first time, the controller does not control the conduction of the other pair of transistors (the second thyristor K2 and the third thyristor K3), and the alternating current output by the single-phase full-bridge inverter circuit keeps oscillating. After the controller determines that the voltage of the alternating current output by the single-phase full-bridge inverter circuit passes through a plurality of zero-crossing points, another pair of transistors (a second thyristor K2 and a third thyristor K3) is triggered to be conducted.
After the controller controls the second thyristor K2 and the third thyristor K3 to be turned on, the controller also outputs the alternating current oscillating up and down at the zero point through the second thyristor K2 and the third thyristor K3, and the alternating current also oscillates continuously and increases gradually. The controller controls the first thyristor K1 and the fourth thyristor K4 to be turned on after determining that the zero-cross detection circuit detects that the voltage of the alternating current output through the second thyristor K2 and the third thyristor K3 also passes through the zero-cross point for the same number of times. So circulation in turn, single-phase full-bridge inverter circuit can output the alternating current including super audio frequency resonant current and intermediate frequency resonant current component, and like this, the alternating current that flows through heating coil is the alternating current of super audio frequency resonant current and intermediate frequency resonant current dual-frenquency component promptly, can realize the dual-frenquency induction heating to high-power device.
As shown in fig. 2, the three-phase full-bridge rectifier circuit 21 includes 6 thyristors T1 to T6, and the connection and control manner of the 6 thyristors can be referred to in the prior art, and the three-phase full-bridge rectifier circuit 21 converts the input ac power into dc power and outputs the dc power to the single-phase full-bridge inverter circuit 23.
Alternatively, the controller may trigger the conduction of another pair of transistors in the first inverter bridge arm and the second inverter bridge arm after determining that the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is at the second zero-crossing point and before the third zero-crossing point. Figure 3 is an output waveform of parameters associated with a dual frequency induction heating power supply according to an exemplary embodiment, fig. 3(a) is a waveform diagram of an alternating current output by the dual-frequency induction heating power supply and containing dual-frequency components of a superaudio resonant current and an intermediate-frequency resonant current, and it can be seen from the diagram that the frequency of the superaudio resonant current contained in the current waveform is about 10kHz, FIG. 3(b) is a voltage waveform of dual-frequency component alternating current output by the dual-frequency induction heating power supply and containing a superaudio frequency resonance current and a medium-frequency resonance current, fig. 3(c) is a signal waveform triggered by two pairs of transistors (a first thyristor, a fourth thyristor, a second thyristor and a third thyristor) in the single-phase full-bridge inverter circuit, and it can be seen from fig. 3(b) and 3(c) that the triggering frequency of the two pairs of transistors is much lower than the resonant frequency of the dual-frequency induction heating power supply, and the resonant frequency of the dual-frequency induction heating power supply is about 2-3 times of the triggering frequency of the two pairs of transistors. Therefore, on one hand, the alternating current containing two frequency components of the ultrasonic frequency resonance current and the intermediate frequency resonance current can be output under the condition that a high-frequency thyristor is not needed. On the other hand, the problem that the circuit has a short-circuit fault due to the fact that the first thyristor and the second thyristor are conducted simultaneously and the third thyristor and the fourth thyristor are conducted simultaneously can be avoided.
As shown in fig. 4, the dual-band induction heating power supply further includes a transformer 28, one incoming line terminal of a primary side of the transformer 28 is connected to a connection point of the first thyristor K1 and the second thyristor K2, the other incoming line terminal of the primary side of the transformer 28 is connected to a connection point of the third thyristor K3 and the fourth thyristor K4, and a secondary outgoing line terminal of the transformer 28 is connected in parallel to the zero-cross detection circuit 27, the resonant capacitor 24, and the heating coil 25.
The transformer can ensure the electrical isolation between the load side and the single-phase full-bridge inverter circuit side, and ensure the circuit safety of the double-frequency induction heating power supply.
Referring to fig. 4, a first commutation inductor L1 and a second commutation inductor L2 are connected in series between the first thyristor K1 and the second thyristor K2, a third commutation inductor L3 and a fourth commutation inductor L4 are connected in series between the third thyristor K3 and the fourth thyristor K4, a connection point of the first commutation inductor L1 and the second commutation inductor L2 is connected to one input terminal of the primary side of the transformer 28, and a connection point of the third commutation inductor L3 and the fourth commutation inductor L4 is connected to the other input terminal of the primary side of the transformer 28.
The first phase-change inductor, the second phase-change inductor, the third phase-change inductor and the fourth phase-change inductor can inhibit the first thyristor and the fourth thyristor in the single-phase full-bridge inverter circuit from being alternatively conducted with the second thyristor and the third thyristor of the other pair of the transistors, so that the peak value of alternating current output by the double-frequency induction heating power supply is prevented from suddenly changing, and the first thyristor, the second thyristor, the third thyristor and the fourth thyristor are prevented from being damaged.
The present disclosure also provides a control method of a dual-frequency induction heating power supply, which is applied to the dual-frequency induction heating power supply shown in any one of fig. 2 to 4, and the control method of the dual-frequency induction heating power supply includes:
controlling one pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted;
and determining that the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is after the second zero-crossing point and before the third zero-crossing point, triggering the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted, and outputting the alternating current comprising the ultrasonic frequency resonance current and the medium-frequency resonance current component by the single-phase full-bridge inverter circuit.
In this embodiment, when one pair of tubes of the first inverter bridge arm and the second inverter bridge arm is controlled to be conducted, for example, one pair of tubes of the first thyristor and the fourth thyristor is conducted, and the pair of tubes is output as alternating current oscillating up and down at a zero point through the first thyristor and the fourth thyristor, and the alternating current oscillates continuously and increases gradually in amplitude. The zero-crossing detection circuit can detect whether the voltage of the alternating current crosses zero, before the voltage of the alternating current crosses zero for the first time, the other pair of transistors (the second thyristor and the third thyristor) is not controlled to be conducted, and the alternating current output by the single-phase full-bridge inverter circuit keeps an oscillation state continuously. After the voltage of the alternating current output by the single-phase full-bridge inverter circuit is determined to pass through a zero crossing point for a plurality of times, another pair of transistors (a second thyristor and a third thyristor) is triggered to be conducted.
After the second thyristor and the third thyristor are controlled to be switched on, alternating current oscillating up and down at the zero point is also output through the second thyristor and the third thyristor, and the alternating current can also continuously oscillate and gradually increase in amplitude. And after the zero-crossing detection circuit detects that the voltages of the alternating currents output by the second thyristor and the third thyristor pass through zero-crossing points for the same times, the first thyristor and the fourth thyristor are controlled to be conducted. So circulation in turn, single-phase full-bridge inverter circuit can output the alternating current including super audio frequency resonant current and intermediate frequency resonant current component, and like this, the alternating current that flows through heating coil is the alternating current of super audio frequency resonant current and intermediate frequency resonant current dual-frenquency component promptly, can realize the dual-frenquency induction heating to high-power device.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (5)
1. A dual frequency induction heating power supply comprising: a three-phase full-bridge rectifying circuit, a smoothing reactor, a single-phase full-bridge inverter circuit, a resonant capacitor and a heating coil, the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises a first thyristor positioned on the upper arm and a second thyristor positioned on the lower arm, the second inversion bridge arm comprises a third thyristor positioned on the upper arm and a fourth thyristor positioned on the lower arm, wherein the first thyristor and the fourth thyristor are a pair of transistors, the second thyristor and the third thyristor are a pair of transistors, the positive output end of the three-phase full-bridge rectifying circuit is connected with the smoothing reactor, the anode of the first thyristor and the anode of the third thyristor, the cathode of the second thyristor and the cathode of the fourth thyristor are connected with the output negative end of the three-phase full-bridge rectifying circuit; the resonant capacitor and the heating coil are connected in parallel to a connection point of the first thyristor and the second thyristor and a connection point of the third thyristor and the fourth thyristor, and the resonant capacitor and the heating coil are characterized by further comprising: a controller and a zero-crossing detection circuit,
the controller is respectively connected with the control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, the zero-crossing detection circuit is connected with the resonant capacitor in parallel, the controller is used for controlling the conduction of a pair of transistors in the first inverter bridge arm and the second inverter bridge arm and determining that the zero-crossing detection circuit detects that the voltage of alternating current output by the single-phase full-bridge inverter circuit is at a first zero-crossing point for a plurality of times, the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm are triggered to be conducted, and the single-phase inverter full-bridge circuit outputs alternating current comprising super-audio frequency resonant current and intermediate-frequency resonant current components.
2. The dual-frequency induction heating power supply of claim 1, wherein the controller is configured to trigger the conduction of the other pair of transistors of the first inverter bridge arm and the second inverter bridge arm after controlling the conduction of one pair of transistors of the first inverter bridge arm and the second inverter bridge arm and determining that the zero-crossing detection circuit detects that the alternating current output by the single-phase full-bridge inverter circuit is at a first zero-crossing point for several times, and the triggering of the conduction of the other pair of transistors of the first inverter bridge arm and the second inverter bridge arm includes:
the controller is used for triggering the conduction of the other pair of transistors in the first inverter bridge arm and the second inverter bridge arm after the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is at the second zero-crossing point and before the third zero-crossing point.
3. The dual-band induction heating power supply according to claim 2, further comprising a transformer, wherein one incoming line terminal of the primary side of the transformer is connected to a connection point of the first thyristor and the second thyristor, the other incoming line terminal of the primary side of the transformer is connected to a connection point of the third thyristor and the fourth thyristor, and a secondary outgoing line terminal of the transformer is connected in parallel to the zero-cross detection circuit, the resonant capacitor, and the heating coil.
4. The dual-frequency induction heating power supply of claim 3, wherein a first commutation inductor and a second commutation inductor are connected in series between the first thyristor and the second thyristor, a third commutation inductor and a fourth commutation inductor are connected in series between the third thyristor and the fourth thyristor, a connection point of the first commutation inductor and the second commutation inductor is connected to one line inlet terminal of the transformer primary, and a connection point of the third commutation inductor and the fourth commutation inductor is connected to the other line inlet terminal of the transformer primary.
5. A control method of a double-frequency induction heating power supply is applied to the double-frequency induction heating power supply, and the induction heating power supply comprises a controller, a three-phase full-bridge rectifying circuit, a smoothing reactor, a single-phase full-bridge inverting circuit, a zero-crossing detection circuit, a resonant capacitor and a heating coil; the single-phase full-bridge inverter circuit comprises a first inverter bridge arm and a second inverter bridge arm which are connected in parallel, the first inverter bridge arm comprises a first thyristor positioned on an upper arm and a second thyristor positioned on a lower arm, the second inverter bridge arm comprises a third thyristor positioned on the upper arm and a fourth thyristor positioned on the lower arm, the positive output end of the three-phase full-bridge rectifier circuit is connected with the smoothing reactor, the anode of the first thyristor and the anode of the third thyristor, and the cathode of the second thyristor and the cathode of the fourth thyristor are connected with the negative output end of the three-phase full-bridge rectifier circuit; the first thyristor and the fourth thyristor are a pair of transistors, and the second thyristor and the third thyristor are a pair of transistors; the resonant capacitor and the heating coil are connected in parallel to a connection point of the first thyristor and the second thyristor and a connection point of the third thyristor and the fourth thyristor, and the controller is respectively connected with the control ends of the first thyristor, the second thyristor, the third thyristor and the fourth thyristor and the zero-crossing detection circuit, wherein the method comprises the following steps:
controlling one pair of transistors in the first inverter bridge arm and the second inverter bridge arm to be conducted;
and determining that the zero-crossing detection circuit detects that the voltage of the alternating current output by the single-phase full-bridge inverter circuit is after the second zero-crossing point and before the third zero-crossing point, triggering the conduction of another pair of transistors in the first inverter bridge arm and the second inverter bridge arm, and outputting the alternating current comprising the ultrasonic frequency resonance current and the medium-frequency resonance current component by the single-phase full-bridge inverter circuit.
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| CN201911053330.6A CN110708779A (en) | 2019-10-31 | 2019-10-31 | Dual-frequency induction heating power supply and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111935862A (en) * | 2020-08-12 | 2020-11-13 | 上海恒精感应科技股份有限公司 | Intelligent induction heating power supply |
| CN114070086A (en) * | 2021-10-28 | 2022-02-18 | 西安理工大学 | Working method of random double-frequency induction heating main circuit |
| CN114599124A (en) * | 2022-03-08 | 2022-06-07 | 深圳市深科达智能装备股份有限公司 | Synchronous double-frequency induction heating equipment and heating method thereof |
-
2019
- 2019-10-31 CN CN201911053330.6A patent/CN110708779A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111935862A (en) * | 2020-08-12 | 2020-11-13 | 上海恒精感应科技股份有限公司 | Intelligent induction heating power supply |
| CN114070086A (en) * | 2021-10-28 | 2022-02-18 | 西安理工大学 | Working method of random double-frequency induction heating main circuit |
| CN114070086B (en) * | 2021-10-28 | 2024-01-16 | 西安理工大学 | Working method of arbitrary double-frequency induction heating main circuit |
| CN114599124A (en) * | 2022-03-08 | 2022-06-07 | 深圳市深科达智能装备股份有限公司 | Synchronous double-frequency induction heating equipment and heating method thereof |
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