标签: factor

IMPROVEDAUTOTUNINGUSINGSHAPEFACTORFROMRELAYFEEDBACK

ImprovedAutotuningUsingtheShapeFactorfromRelayFeedback

ST-L4981POWERFACTORCORRECTOR.pdf

TI-UC2855HighPerformancePowerFactorPreregulator.pdf

TI-uc3854HighPowerFactorPreregulator.pdf

离线式电源的增长使功率因数校正(PFC)成为必须的部分，以减少输入电流，满足未来调整的需要。开关电源采用桥式整流器，后接一个大电容，这会产生谐波电流。这些谐波只会增加电源的RMS输入电流，对真正的功率没有任何贡献。LT1508和LT1509通过集成PFC和脉宽调制器(PWM)，可完全满足这一设计需要。advertisementSingleIC,PowerFactorCorrected,Off-LineSupplyDesignNote143KurkMathewsAneverincreasingnumberofoff-linepowersuppliesnowlowerpartcountandimprovedPCboardlayout.Start-upisincludepowerfactorcorrection(PFC)inordertoreducecontrolledbyseparatePFCandPWMsoftstartpins.Theinputcurrentandmeetfutureregulatoryrequirements.PWMSoftStartpinisheldlow,disablingthePWMoutputSwitchingpowersuppliesthatincorporateabridgerecti-untilthePFCstageisinregulation.ThePWMwillremainfierfollowedbybulkcapacitancecreateharmoniccur-enabledaslongasthePFCoutputvoltagestaysabove73%rents.Theseharmo……

离线式电源的功率因素校正(PFC)目的在于减少输入电流和满足未来稳压的需要。桥式整流器后接大电容的开关电源易产生谐波电流。这些谐波电流只是增加了电源输入电流的RMS，而对真正的功率没有任何贡献。典型的解决方案是对现有的设计增加一个PFC预稳压器和单独的控制器。LT1508和LT1509通过将PFC和脉宽调制器(PWM)集成到芯片内部，取消了独立控制器，PFC通过编程升压稳压器的输入电流来获得。advertisementSingleIC,PowerFactorCorrected,Off-LineSupplyDesignNote143KurkMathewsAneverincreasingnumberofoff-linepowersuppliesnowlowerpartcountandimprovedPCboardlayout.Start-upisincludepowerfactorcorrection(PFC)inordertoreducecontrolledbyseparatePFCandPWMsoftstartpins.Theinputcurrentandmeetfutureregulatoryrequirements.PWMSoftStartpinisheldlow,disablingthePWMoutputSwitchingpowersuppliesthatincorporateabridgerecti-untilthePFCstageisinregulation.ThePWMwillremainfierfollowedbybulkcapacitancecreateharmoniccur-enabledaslongasthePFCoutputvoltagestaysabove73%rents.Theseharmo……

75W可控硅调光230伏电源1000mA的LED驱动器SSL1750UM1032175WSSL1750triacdimmable230VmainsLEDdriverRev.01―9October2009UsermanualDocumentinformationInfoContentKeywordsSSL1750,PFC,LEDdriver,highpower,triac,highpowerfactor,mainsdimmableAbstractUsermanualfortheSSL1750230V(AC)mainsdimmable75W,1000mALEDdriverboard.NXPSemiconductorsUM10321SSL1750triacdimmableLEDdriverRevisionhistoryRevDateDescription0120091009InitialreleaseContactinformationFor……

75W可控硅调光120伏电源1000mA的LED驱动器SSL1750UM1039475WSSL1750triacdimmable120VmainsLEDdriverRev.01―9October2009UsermanualDocumentinformationInfoContentKeywordsSSL1750,LEDdriver,PFC,highpower,triac,highpowerfactor,mainsdimmableAbstractUsermanualfortheSSL1750120V(AC)mainsdimmable75W,1000mALEDdriverboard.NXPSemiconductorsUM10394SSL1750triacdimmableLEDdriverRevisionhistoryRevDateDescription0120091009FirstissueContactinformationFormoreinf……

TESTNF:YFactorMethod--agi...,YFactorMethod……

CrestFactorAndItsInfluenceOnOFDMSystemGetToKnowCrestFactorAndItsInfluenceOnTheDesignOfOFDM-BasedSystemsThisarticleisthethirdinaseriesofquarterlyguestcolumnsbyJustinPanzer,managerofproductmarketing,Rohde&Schwarz.ThisinstallmentiscoauthoredbyBernhardKaehs,aseniordevelopmentexpertinthecompany’sbroadcastingdivision.Theexceptionalperformanceofwirelesscommunicationssystemsandmostrecentlytelevisionbroadcastingisdeliveredinlargemeasurebydigitaltransmissiontechnologyandmorespecificallybyhigher-ordermodulationschemessuchasOrthogonalFrequencyDivisionMultiplexing(OFDM).However,theypresentmajordesignchallenges,sinceOFDMsystemscanhavepeak-to-averagepowerratiosashighas20:1,makingitessentialtocarefullyspecifyRFpowercomponentsin……