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wolong:
380W的PFC,需要至少300uH的电感(按照10%纹波电流).当然,您的电感取的越大,电路的纹波电流越小,有利于EMI的电路设计.不过,通常设计按照10%的纹波电流就够了.根据所需电感数值,再计算所采用的磁心及圈数.建议您检查控制回路,电压和电流环,不同负载下的波形.
2005-02-26 05:20 回复
原帖:关于PFC电感的设计
wolong:
Thiskindofpaperisuselessandyouwillgetnothing.
2005-02-04 22:46 回复
原帖:强烈推荐电源同行学习DSP
wolong:
通常加THERMISTOR,因电阻会因大电流而烧毁.
2005-01-08 03:30 回复
原帖:Boost电路怎样实现输入交流电压过零点启动呢?
wolong:
PrincipleEngineerisnot首席工程师.InacompanylikeNationalSemi,therearetonsofprincipleengineers.Whathesaysinthepaperisonewaytominimizeripplecurrent.
2004-06-15 04:24 回复
原帖:奇文共欣赏 疑义相与析
wolong:
你的变压器激磁电感有多少?有没有饱和?另外,你可以测试通过FETS的电流大小,计算以下管子上的损耗.
2004-05-10 00:52 回复
原帖:求救:驱动管子发热怎么办?
wolong:
Pleasetakealookatmaychang'spost.It'snotsoeasyifyouwanttousemicro-processorinthecontrolloopdesign,voltageloop@currentloopcontrolandPWMgeneration.Iagreewithyouit'seasytoimplementifyouusemicro-processorforpowermanagement,communication,butit'sstillnotsoeasyifyouwanttousemicro-processorinthecontrolloopunlessmorecheap/fastermicro-processorsbecomeavailable.
2004-05-02 05:42 回复
原帖:探讨单片机控制的智能开关电源!
wolong:
YoudefinitelyneedDrivercircuitbetweenPICandtheFETs.Youcancheckthewaveformandfindouttheturn-onandturn-offtimeofyourcurrentcircuit.
2004-05-02 05:35 回复
原帖:关于单片机控制开关电源
wolong:
UseDatatableGeneratemulti-outputsone-by-oneduringonecycle.Eachoutputispre-selectedfromthetabletohavephase-shift.
2004-04-05 23:17 回复
原帖:用DSP240怎么产生三路彼此相差一定角度的三角波?
wolong:
AddaCapacitorThereasonisthatthecomparatoristoofast.Checktheappnotesofcomparator,theyalwayssuggesttoaddasmallcapbetweenoutputofthecomparatorandtheinput.
2004-04-03 05:12 回复
原帖:搞逆变器的同志们进来看看,一个很实际的问题.
wolong:
CheckthepowerratingofallthecomponentsForPFC,thedutycyclewillchangewithinputlinevoltage:Atpeak,dutycycleissmall;Atzerocrossing,dutycycleiscloseto100%IfyouwanttoincreasethePowercapacityofPFC,youcansimplydecreasethecurrentdetectionresistanceorequivalent.Whenyouturnon,theinrushcurrentishigh.Ifyourcircuitisnotreliable,thecomponentscanbeeasilydamaged.Trytobringupthecircuitslowly.
2004-04-03 05:03 回复
原帖:有关于LT1248 pfc 控制芯片的问题 有uc3854的经验者也同时请教
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