一种高输入电压led驱动器的研究

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1、浙江大学硕士学位论文AbstractThispaperstudiesonakindofhighinputvoltagewhiteLightEmittingDiode(LED)driver．AsolusionisproposedafterintroducingthebackgroundofLEDdriverandreviewingthehighinputvoltageconverteLUsingtheseriesconnectedmetal··oxide·-semiconductorfield·-effectt

2、ransistors(MOSFETs)circuitthevoltagestressofasingledevicecanbereduced．IntheproposedcircuitthemasterswitchisdirectlydrivenbythecontrolICwhiletheslaveswitchisdrivenbytheauxiliarycircuit．Atthesametime，effectivevoltagesharingisrealizedbytheauxiliaryckcuit．Whena

3、ppliedinaquasi·-resonantfly·-backDC／DCLEDdriver,theoperationprincipleoftheproposedcircuitisanalyzedindetail．AfterthatthevoltagestressofeachMOSFETandthepowerlossesoftheauxiliarycircuitarediscussed．Amethodisgiventoreducethevoltagestressoftheswitchandtoimprove

4、thewholeefficiencyoftheconverter．Aprototypeisbuilttoverifytheperformanceofthiscircuit．AstheproposedcircuitCanbeusedinthewiderangeinputvoltagesituation,itissuitableforthesingle—stagepowerfactorcorrection(PFC)flybackAC／DCLEDdriver．Powerlossesoftheauxiliarycir

5、cuitarecalculatedandthensomeexperimentresultsaregiven．Finallyamulti-MOSFETsseriesconnectedcircuitisstudied．TheoperateprincipleofthreeMOSFETsconnectedcircuitbasiconthesingle—stagePFCflybackAC／DCLEDdriverisanalysed．Afterdiscussingthevoltagestressesandpowerlos

6、sesofthecircuit，designguidelinesareshown．AprototypeshowsthatthecircuitCanreliablysharethevoltageacrossthethreeswitches．ItwillfurtherdecreasethevoltagestressofeveryMOSFETcompare、^，imthedualMOSFETsseries．connectedcircuit．TheseriesconnectedMOSFETscircuitCanbee

7、ffectivelyappliedinthequasi-resonantflybackconverter,whichwillsavethecostofthehighinputvoltageLEDdriver．Besides，itisextendableformulti．MOSFETsseriesconnectedsituation．Keywords：MOSFET,seriesconnected，quasi-resonantflyback,LEDdriver—-Il—浙江大学硕士学位论文摘要目录ABSTRACT

8、第1章绪论III．11．1高输入电压LED驱动器的应用背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。lJ．J『．J『尢功雾￡￡D膨疙愿⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯，1．1．2高输入电压LED驱动器的挑战⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．2现有高输入电压变流器研究⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．