同步整流器在正激变换器.pptx

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1、1A.Rectifier CircuitB.Rectifier ConceptC.Synchronous Rectifier C-1:RCD Clamp&Self-Driven SRs C-2:Active Clamp&Self-Driven SRs C-3:Control DrivenD.Power Loss ComparisonsE.Efficiency Curve第1页/共12页2Fig1:Forward Converter with MOSFET Fig2:Forward Converter with Diode A.Rectifier Circuit第2页/共12页3B.Rectif

2、ier ConceptThe switching losses caused by the reverse recovery current of the body-diode will be dependent of the carried current in the instant in the which the voltage between anode and cathode reverses become negative第3页/共12页4C.Synchronous Rectifier(a)Gate Driver signal(b)Drain to Source voltage

3、of primary switch(c)Secondary winding voltage(d)Current through SR2(e)Current through SR3C-1 RCD Clamp&Self Driven SRs第4页/共12页5C.Synchronous RectifierC-2 Active Clamp&Self Driven SRs(a)Gate Driver signal(b)Drain to Source voltage of primary switch(c)Secondary winding voltage(d)Current through SR2(e)

4、Current through SR3第5页/共12页6(a)Gate Driver signal(b)Drain to Source voltage of primary switch(c)Secondary winding voltage(d)Current through SR2(e)Current through SR3C.Synchronous RectifierC-3 Control Driven SRs第6页/共12页7D.Power Loss ComparisonsConverter efficiencyConverter Efficiency(For Schottky Rec

5、tifiers)Converter Efficiency(For Synchronous Rectifiers)PO :Output Power Ploss:Total Loss;PSH :Schottky Rectifiers Loss PSR :Synchronous Rectifiers Loss第7页/共12页8D.Power Loss ComparisonsSchottky Power LossSelf Drivens SR LossControl Drivens SR Loss第8页/共12页9D.Power Loss ComparisonsVD=VSH=Body Diode Voltage;Ddead =dead time duty cycle;Ddelay =delay time duty cycleEfficiency(Active Self Driven SRs)Efficiency(RCD Self Driven SRs)Efficiency(Control Driven SRs)第9页/共12页10E.Efficiency CurveDdelay 0第10页/共12页11E.Efficiency CurveDdead 0.2第11页/共12页12谢谢您的观看！第12页/共12页