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Induction Heating Power Supply Based on Asymmetrical Voltage-Cancellation Control and CPDM Control

Author: GaoChengLin
Tutor: ZhouYueQing
School: Tianjin University
Course: Control Science and Engineering
Keywords: induction heating Asymmetrical Voltage-Cancellation Control PDM CPDM SEPP
CLC: TM464
Type: Master's thesis
Year: 2012
Downloads: 49
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First of all, this paper describes the development history of induction heating, the basic principles, characteristics and application of the induction heating and the basic knowledge of induction heating, the domestic and international situation and the trend of the development of the induction heating. It introduces the induction heating power supply topolopy structure, analysis of the series resonant inverter and parallel resonant inverter, compares and makes the choice of the series resonant inverter and parallel resonant inverter, analyses the load characteristics of the series resonant inverter, and studies the common DC side and AC side power adjustment methods of the series resonant inverter. It describes Asymmetrical Voltage-Cancellation Control method, researches and analyses this method, analyses its basic principles and the conditions of the soft-switching. It introduces and describes the traditional Pulse Density Modulation(PDM)method, and introduces the improved PDM for the shortcomings of the PDM, CPDM power adjustment method, studies the principles of the CPDM.It introduces a novel voltage-type multi-resonant ZCS-PWM single-ended push -pull (Single-Ended Push Pull, SEPP) high frequency inverter, introduces its topolopy structure and power control scheme—a novel control method of a combination of Asymmetrical Voltage-Cancellation Control and CPDM control. It analyses the operating principles, the validity of theoretical analysis and the superior of this power control scheme is verified by the simulation. In a certain extent, it adopts Asymmetrical Voltage-Cancellation Control under a constant frequency. In order to achieve the soft switching in low power range and expand the range of the soft switching, PDM control scheme is introduced in low power range. And then we can use the control method of a combination of Voltage-Cancellation Control and PDM control, can achieve the soft switching in the full extent of power adjustment well. Finally, in view of the superiority of CPDM compared with PDM, we achieve a combination of Asymmetrical Voltage-Cancellation Control and CPDM control to achieve the power adjustment. As a result it obtains higher accuracy, and it can achieve continuous of the currents in light load. Generally speaking, this SEPP circuit topology is simple, little devices, low cost, high efficiency, wide continuous power adjustment range, low switching loss, low switching noise, and wide range of soft switching and so on.Finally, the design of control circuit, including the design and implementation of the phase-locked loop, the design of IGBT drive circuit, overvoltage protection circuit, overcurrent protection circuit and phase failure protection circuit and so on.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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