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Abstract：
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The main reason and effect of the power factor and the efficiency reduction of induction heating furnace because of changing the working condition during the heating were analyzed.Some key parameters of power factor were introduced.A new method of on time checking the power factor and on time working frequency modulating using the microelectronics technology according to the checking result was put forward.The power factor of the system was greatly improved.A circuit model was established to validate the method.Simulation demonstrates that this method is effective to improve power factor and a basic strategy to adjust the working frequency is gained,which provides a theoretical guidance for designing self-tracking system of resonance frequency.
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Funds：
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杭州市属高校重点实验科技创新项目(2006831H02)
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AuthorIntro：
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Reference：
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[1]Mauch K.Transistor Inverter for Medium Power InductionHeating Application[Z].Canada:AC Statpower Inc.,1986.
[2]潘天明.工频和中频感应炉[M].北京:冶金工业出版社,1983.
[3]约翰.戴维斯.感应加热手册[M].张淑芳译.北京:国防工业出版社,1985.
[4]戴育航.IGBT晶体管模块中频感应加热炉[J].铸造,2000,49(9):548-550.
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