Transcription of UCC28070 Implement Bridgeless PFC Pre-Regulator …
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UCC28070 Implement Bridgeless PFC Pre-Regulator …
1 BridgelessPFCA pplicationReportSLUA517 JULY2009 UCC28070 ImplementBridgelessPowerFactorCorrection (PFC)Pre-RegulatorDesignLiuXueChao, (PFC) (CCM) , ,theEnergyEfficiencyAlliance's(NEEA's)80 PLUS initiative(andmoreoveritsBronze,Silveran dGoldderivatives) (ZVT)PFCorInterleavedPFC,forexample, ,bridgelessPFCattractsmoreinterestforit' L lineishigh, ,Q2andD2operateasBoostswitchingmodewhent heterminal N lineishigh, ,thelossesduetothebridgerectifierareelim inated, , ,forexample, , , , ,thereisnobridgerectifierloss, , JULY2009 UCC28070 ImplementBridgelessPowerFactorCorrection (PFC)Pre-RegulatorDesign1 SubmitDocumentationFeedbackAC LineLoD1D2Q1Q2 CoRoLNOperating Cellwhen L is highOperating Cellwhen N is highAC LineLoD1D2Q1Q2 CoRoLNAC (PFC)Pre-RegulatorDesignSLUA517 ,therearesomeobstaclesthatneedtoovercome . BecausethelineisfloatingcomparedtothePFC stageground, ForcaonventionalPFC, ,forabridgelessPFC, ,whichmakesthebridgelessPFC scurrentsensingcomplicatedanddifficultto monitor.
www.ti.com Bridgeless PFC Despite many advantages of a bridgeless PFC, there are some obstacles that need to overcome. •Because the line is floating compared to the PFC stage ground, simple circuitry cannot sense input
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