有关PFC的一些问题,供大家参考
This time, I design a 240W output single output power , PFC was used L6561, it is a simply controller , easy to design, but the following item need to care:
1. Its driver current just only +/-700mA, if you design a higher power, you should add an additional driver circuit, totem pole circuit is a good and simply solution, and you need to care the layout. If not enough, easy to cause unstable.
2. For ZCD signa, the turn ratio need to care, as my experience: set it between 3:1 and 4:1 is a good idea.
3. For the CS, although this chip design in a LEB inside , but actually, it need a RC filter for it.Maybe need to paralled a cap with current sense resistor for EMI solution.
4. For the inductor, the litz wire is a good selection, if no this wire, can use thin wire to paralleled, please don\'t ignore it, in fact, the AC loss is higher than the DC loss, notice it. I test it, will inprove efficiency 2% or more.
Above just for your reference only, maybe, different application and layout, will cause different result.
Welcome you for discussion.
有关PFC的一些问题,供大家参考
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@arthur.deng
ForPFCinductordesignYes,youareright,theskineffectisanimportantandbasicconsiderationfortheinductordesign,buttheProximityEffectisamuchmoreimportantconsiderationforPFCinductorespecialinDCMPFCconvertor.
你好,请问一下PFC中输出功率是怎么算出来的?谢谢!
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