移相全桥倍流整流dcdc变换器的研究

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1、移相全桥倍流整流DC／DC变换器的研究摘要随着现代电力电子技术和电力电子器件的快速发展，开关电源的高频化、小型化、轻量化已经成为发展的主要方向，采用软开关技术是主要的手段之一。论文采用了移相控制和倍流整流技术，研制一台功率为1kw的DC／Dc变换器装置，在变压器原边加入隔直电容和饱和电感，实现了零电压零电流全桥变换和整流二极管的软开关。原边超前桥臂保持宽范围的零电压开通条件，滞后桥臂实现了无环流损耗的零电流关断；副边的倍流整流方式，两个二极管实现了自然换流，两个输出电感交错并联的方式，大大减小了系统电流纹波，减小了电感的尺寸，从而减小系统的体积和重量。该装置的控制系统采用

2、电压外环电流内环的双闭环控制方式，内。环采用峰值电流控制，通过对内环的降阶处理，简化了系统调节器的设计。最后，给出了实验结果，系统工作稳定，所有的功率管都实现了软开关，降低了开关损耗，提高了电磁兼容性，取得了满意的效果。关键词：移相全桥倍流整流软开关峰值电流控制RESEARCHONPHASESHIFTFULLBRlDGEDC，DCCONVERTERWITHCURRENT-DOUBLERRECTIFIERABSTRACTAsthefastdevelopmentofmodemelectricalandelectronicstechnologyandthedeviceofpow

3、erelectronics,thedevelopmenttrendofmodemelectronicproductsishi曲frequency,miniaturizationandlightweighted，andsoft-switchingtechnologyisoneofthemainmeans．AIkWDC／DCconverterisdevelopedwithphase-shiftandcurrent-doublerrectifierapplied．Intheprimarysideofthetransformer,ablockingcapacitorandasat

4、urableinductorareused．IntheCOlwerter,Zerovoltageandzerocurrentswitching(zvzcs)inthefull-bridgepowerswitchesandthesoft-switchingoftherectifierdiodesaleachieved．Theleading—legoperatinginzerovoltageonoverwideloadrange；andzerocurrentoffwithoutcirculatingcurrentlossisachievedforthelagging-leg．

5、Inthesecondarysideofthetransformer,current-doublerrectifier,twodiodestumedoffnaturally,andtwooutputinductorsconnectedinaninterleavingway,whichmakesthecurrentripplesignificantlyreduced,anddecreasesthesizeofinductors．Therefore，thesizeandweightofthesystemCanbedecreasedsignificantly．Currentan

6、dvoltagedoubleclosed-loopcontrolstrategyisappliedtotheconverter,inwhichcurrentloopisinsideandvoltageloopisoutside．PeakculTentcontrolstrategyisusedinthecu盯entloop．Thecurrentloopcallbeconsideredasaproportionalelement,theorderofwholesystemCanbereduced越aninertialelement,whichmakesthecontrolle

7、rdesigningeasier．Theexperimentalresultisgiveninthelastpartofthethesis，theconverterworksingoodperformance，allthepowerswitchesachievedinoperatinginsoft-switchingcondition,theturn-onandtom-offlossisreducedsignificantly,theEMCⅡ(Electromagneticcompatibility)isimproved．as