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380W的PFC,需要至少300uH的電感(按照10%紋波電流).當(dāng)然,您的電感取的越大,電路的紋波電流越小,有利于EMI的電路設(shè)計(jì).不過,通常設(shè)計(jì)按照10%的紋波電流就夠了.根據(jù)所需電感數(shù)值,再計(jì)算所采用的磁心及圈數(shù).建議您檢查控制回路,電壓和電流環(huán),不同負(fù)載下的波形.

Thiskindofpaperisuselessandyouwillgetnothing.

通常加THERMISTOR,因電阻會(huì)因大電流而燒毀.

PrincipleEngineerisnot首席工程師.InacompanylikeNationalSemi,therearetonsofprincipleengineers.Whathesaysinthepaperisonewaytominimizeripplecurrent.

你的變壓器激磁電感有多少?有沒有飽和?另外,你可以測(cè)試通過FETS的電流大小,計(jì)算以下管子上的損耗.

Pleasetakealookatmaychang'spost.It'snotsoeasyifyouwanttousemicro-processorinthecontrolloopdesign,voltageloop@currentloopcontrolandPWMgeneration.Iagreewithyouit'seasytoimplementifyouusemicro-processorforpowermanagement,communication,butit'sstillnotsoeasyifyouwanttousemicro-processorinthecontrolloopunlessmorecheap/fastermicro-processorsbecomeavailable.

YoudefinitelyneedDrivercircuitbetweenPICandtheFETs.Youcancheckthewaveformandfindouttheturn-onandturn-offtimeofyourcurrentcircuit.

UseDatatableGeneratemulti-outputsone-by-oneduringonecycle.Eachoutputispre-selectedfromthetabletohavephase-shift.

AddaCapacitorThereasonisthatthecomparatoristoofast.Checktheappnotesofcomparator,theyalwayssuggesttoaddasmallcapbetweenoutputofthecomparatorandtheinput.

CheckthepowerratingofallthecomponentsForPFC,thedutycyclewillchangewithinputlinevoltage:Atpeak,dutycycleissmall;Atzerocrossing,dutycycleiscloseto100%IfyouwanttoincreasethePowercapacityofPFC,youcansimplydecreasethecurrentdetectionresistanceorequivalent.Whenyouturnon,theinrushcurrentishigh.Ifyourcircuitisnotreliable,thecomponentscanbeeasilydamaged.Trytobringupthecircuitslowly.