(精品)bridgelessPFC(1208).ppt
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1、LITE ONPower Electronics Lab(Beijing)Power Conversion DivisionBridgeless PFC Vivian sunLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBridgeless PFCThe purpose-For higher power range,the bridge power loss is high,especially at low line condition.For example,the bridge power loss of
2、 1200W PS is about 24W.-The bridgeless PFC topology can reduce total power loss,improve efficiency and thermal performance.LITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBridgeless PFCThe comparison of bridge and bridgeless PFCThe design process Power loss calculationDesign toolsLI
3、TE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGThe comparison of bridge and bridgeless PFCTopologyPower Loss and Parts CountCurrent SensingIac SensingFloating GroundLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGThe topology of bridge PFCLITE ONPower Electronics Lab
4、.(Beijing)Power Conversion BU,P&C SBGThe Topology of Bridgeless PFCLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBridgeless PFC OperationLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGComparison of Bridge and Bridgeless PFCLITE ONPower Electronics Lab.(Beijing)Po
5、wer Conversion BU,P&C SBGCurrent SensingLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGCurrent SensingLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGCurrent SensingLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGIac Sensing(bridge)LITE ONPower Ele
6、ctronics Lab.(Beijing)Power Conversion BU,P&C SBGIac Sensing(bridgeless)LITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGThe Floating Ground of Bridgeless PFCWith a coupled choke as boost inductor,no capacitor can link L and N to power GND,otherwise the choke will be shortened.So the
7、 power GND is floating with the switches on and off at a switching frequency.LITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGThe Comparison of EfficiencyLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGDesign SpecificationsVin=90264VACVo=380VDCPo=1200WFs=100kHzPF0.98
8、(Full load&high line)Eff92%LITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBlock DiagramLITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBoost Inductor DesignPeak input current at low line Ipk:Duty cycle at low line D:LITE ONPower Electronics Lab.(Beijing)Power Conve
9、rsion BU,P&C SBGBoost Inductor DesignBoost inductance L:Delta I is 20%peak currentSelect L=300uH(initial inductance)LITE ONPower Electronics Lab.(Beijing)Power Conversion BU,P&C SBGBoost Inductor DesignMagnetic core:Arnold MS-185060-2 or Dongbu S184-086A Magnetic material:sendust(kool Mu)Al=86mH/100
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