固态高频lclc谐振负载感应加热电源的研究

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1、华北电力大学硕士学位论文摘要本文首先对感应加热电压型逆变器LLC谐振回路的拓扑结构和电路特性进行了简要分析，针对MOSFET构成的单向全桥逆变器在LLC负载品质因数较低时，开关器件工作角度较大，开关损耗增加的问题，提出了一种适用于高频感应加热电压型逆变器的新型LCLC负载谐振匹配方案。该方案通过加入附加电容，减小了逆变器输出电压和输出电流间的相位角，从而降低开关损耗。详细分析了LCLC负载谐振回路的拓扑结构、输出功率、输出电流比和电压比，对负载的参数进行匹配，并对所分析的结果进行了仿真试验。仿真结果表明，LCLC负载谐振回路不仅具有LLC负载谐振回路

2、电流变换的特性，而且降低了开关损耗，提高了电源的输出功率，增强了电源的稳定性。通过EP2C5T144C8FPGA作为主控制芯片生成控制脉冲，可灵活修改死区时间；通过对逆变器输出电压和并联支路谐振电容电流的采样，完成了系统的单闭环锁相控制；设计了电流保护电路和电压保护电路来确保电源的安全运行。最后通过样机实验，验证了所提方法的可行性以及理论分析的正确性。关键词：感应加热；负载匹配；LLC谐振电路；LCLC谐振电路-I-华北电力大学硕士学位论文AbstractFirstly,thetopologyandcircuitspecificationoftheL

3、LCresonanttopologycharacteristicofinductionheatingvoltagesourceinverterisdiscussedbrieflyinthispaper.TosolvetheproblemsthattheswitchcomponentswouldworkatlargephaseangleandtheswitchlosseswouldincreaseunderthelowqualityfactorQinMOSFETsinglephasefull-bridgehighfrequencyinverterLLC

4、resonantload,thispaperpresentsanewLCLCloadmatchingtopologyforhigh-frequencyinductionheatingvoltagesourceinverter.Byaddingadditionalcapacitor,thephaseangleoftheswitchcomponentsandswitchlossescanbereduced.Thetopology,outputpower,outputcurrentratioandvoltageratioofLCLCloadresonant

5、circuitareanalysisdetailedly.Furthermore,matchingtheloadparametersandsimulatingthetheoryoftheanalysis.ThesimulationexperimentshowsthattheLCLCloadresonantcircuitnotonlyhasthecharcateristicsofthecircuitcurrenttransformationofLLCloadreaonantcircuit,butalsocanreducetheswitchlossesa

6、ndimprovetheoutputpower,meanwhilestrengthenthestabilityofpowersupply.UsingEP2C5T144C8FPGAasthemaincontrolchip,controlpulsesaregenerated,andthedeadtimecouldbeflexiblelymodified.Throughsamplingoftheinverteroutputvoltageandparallelbranchresonantcapacitancecurrent,thesinglecloseloo

7、plockphasecontrolofthesystemiscompleted.Thecurrentandvoltageprotectioncircuitsaredesignedtoensurethesafetyoperationofthepowersupply.Finally,theprototypeexperimentalresultsvalidatetheproposedapproachfeasibilityandtheoreticalanalysis’validity.Keywords:inductionheating，loadmatchin

8、g，LLCresonantcircuit，LCLCresonantcircuit-II-华北电力大学硕士学位