基于DPLL的高频逆变电源建模与研究.PDFVIP

第39卷第5期 电力电子技术 Vol.39,No.5 基于DPLL的高频逆变电源建模与研究 惠 晶，藏小惠，蔡爱军 (江南大学，，江苏无锡 214122) 摘要:采用基于DSP的数字锁相环(DPIJ,)对高频逆变电源输出频率进行实时控制，可实现逆变器工作频率对 负载谐振频率的同步跟踪，确保逆变器开关器件工作在零电压零电流软开关(ZVZCS)状态，显著减小功率器件的开 关损耗和提高装置效率。本文以负载串联谐振逆变电源为模型，针对负载参数变化引起的固有谐振频率变化，导致 逆变器效率降低及开关器件应力增加的普遍现象，提出一种基于DPLL控制的逆变电源。结合锁相环的数学模型，讨 论了DPLL控制的逆变电源的数学建模，在Simulink环境中该电源的构筑及串联谐振负载的模型，给出了相应的仿 真波形和实用电源试验波形，为分析和设计逆变电源提供了必要的理论依据。 关健词:逆变器;锁相环控制/建模;串联谐振;高频逆变器 中图分类号:TM464;TN80 文献标识码:A 文章编号:1000-100x(2005)05-0115-03 ModelingandResearchonHF-InverterPowerSupplybasedonDPLL HUIJing,ZANGXiao-hui,CAIAi一un (SouthernYangtzeUniversity,Wuxi214122,China) Abstract:TheDigitalPhase-LockedLoop(DPLL)technologybasedonaDigitalSignalProcessor(DSP)isappliedto controltheoperatingfrequencyofanHigh-Frequency-Inverter(HF-Inverter)timely,soastoadaptvarietiesoftheloadreso- nantfrequencytokeeptheinverteralwaysworkingonZeroVotage-ZeroCurrentSwitching(ZVZCS)mode.Meanwhile,the lossesofswitchingcomponentsarereducedobviouslyandtheefficiencyofthepowerisimprovedgreatlyonZVZCSmode. Inthispaper,aninductionheatingpowerisdesignedtakingtheloadseries-resonantHF-Invertermodelasanexample.In considerationoftheresonantfrequencybeingchangedbyloadparametervariation,whichledthepowerefficiencyreduc- tionandthestressincreasingofswitchingcomponentsinaconventionalinverter,anovelHF-InverterbasedonDPLLis designed,anditsmathematicmodelsaresettedupandsimulated.Themodelsoftheproposedinverterandtheseries-reso- nantloadareconstructedinMatlab/Simulinkenvironment.Thecorrespondingwaveformsofsimulationandexperimentsare given.TheresultsshowthatthecontrolmethodsandtheinvertermodelsbasedonDPLLarereasonableandcorrect.Itpro- videsausefulandpracticalmethodtoana