其他（服务器和电源）：兼容 M-CRPS 的图腾柱无桥 PFC具有再浪涌电流控制和极低 iTHD.pdf

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1、OCP Global Summit October 18,2023|San Jose,CABosheng Sun&Sheng-Yang Yu Texas InstrumentsA M-CRPS compatible totem-pole bridgeless PFC with re-rush current control and extreme low iTHDKey M-CRPS RequirementsHigh efficiency,high power density,limited re-rush current,and low iTHDTopology selection to a

2、chieve high efficiencyBulk capacitor size reduction for high power densityRe-rush current managementSteps to achieve low iTHDReferenceAgendaM-CRPS:Modular Hardware System Common Redundant Power SupplyRequire high efficiency.Require high power density.Key M-CRPS Requirements3 form factor(LxWxH):185 x

3、 73.5 x 40mm185 x 60 x 40mm265 x 73.5 x 40mm 80W/in3 100W/in3Loading100%50%20%10%Titanium (2.5kW)94%96%94%90%Titanium (2.5kW)92%96%94%90%M-CRPS Efficiency requirementsM-CRPS:Modular Hardware System Common Redundant Power SupplySpecify re-rush current limit after AC-drop out event.Specify iTHD at dif

4、ferent loads especially 5%-10%load.Key M-CRPS Requirements cont.Efficiency Improvements PFCSiGaNGaNActive“bridge rectifier”in classic boost PFCImplementable with Si MOSCCM Totem pole“bridgeless”PFCCannot be realized with Si MOS,WBG devices needed for fast FETsefficiencyimprovementHigher efficiency i

5、mprovementHighest efficiency improvementClassic boost PFC with diode bridge rectifier AC-switch PFC(or H-PFC)Implementable with Si MOS98%98.3%98.5%99%Isolated DC/DC stageVoutAC input400VDCAux flyback power stage and controllerDC/DC controllerPFC controllerPFC power stageEMI filterIntroduce baby boos

6、t(BB)converterPower Density Improvements Bulk CapVACVBULKVBBSingle PhaseTotem Pole Bridgeless PFCBaby BoostRelay FETLoadVOUTQ2Q1Q3Q4BBFETCBULKCBBIsolated DC-DC ConverterBypass FETRT=2 ,2 ,2=2 3 kW 10(390)2 (320)2=1.207=2 ,2 ,2=2 3 kW 10(390)2 (240)2=635 50%reduction!Without BB:With BB:AC Dropout wit