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Research on PDM&PSPWM Modulated Induction Heating Power Based on DSP

Author: MaHongBin
Tutor: ShenJinFei
School: Jiangnan University
Course: Power Electronics and Power Drives
Keywords: Series resonant Induction heating Power Control PDM PSPWM DSP PLL
CLC: TM924
Type: Master's thesis
Year: 2007
Downloads: 137
Quote: 5
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Abstract


In this paper, the basic principle of induction heating , induction heating technology overview of the status quo and development trend of the series resonant induction heating power supply for the analysis of a variety of series resonant inverter power control strategy based on the principles , advantages and disadvantages , integrated pulse density modulation (PDM) and phase shift modulation (PSPWM), PDM PSPWM proposed new control strategy . PDM PSPWM by simultaneously varying the pulse density and the phase angle to achieve power regulation, so that at the same output power requirements , the pulse density than PDM than PSPWM phase angle is small, thereby stepless adjustment reactive functionality than the step- PDM, and light load current continuously adjustable range: triangle distortion of light load lighter than PSPWM. In the PDM PSPWM series resonant inverter operation based on the analysis process , all the switches solve the problem of the soft switch ; PDM PSPWM by analyzing a power output unit of the output voltage and current power, can then get a cycle of the output pulse density voltage current and power calculation formula . In these theories based on the analysis , this paper designed a composite control strategy based on PDM PSPWM induction heating power supply experimental system, the main circuit of the components were accurate calculation and design, and designed to TMS320LF2407A is used as the core of the control and protection circuit , the DSP peripheral circuit design, and prepared a control strategy based on PDM PSPWM to digital loop phase loop and power control algorithm as the core of the DSP program , the resulting output waveform of good experimental system verification PDM PSPWM new control strategy is feasible.

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric heating
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