PFC到底省电还是费电?电源大侠请看里面的文章

来自国外网站http://www.dansdata.com的一个命为PFC decoded的文章中,我们节选了以下2段内容:

"Active PFC is an actual second circuit. It sucks power from the mains in a resistive way, and feeds it to the low power factor circuit on the other side, isolating the mains from whatever that circuit is doing. Active PFC can iron out lousy power factor better, but it's less efficient, not more; an active PFC circuit will waste some power (at least 10%, in this case) as heat, just like every other circuit in the world.

The AC supplier won't be happy with this, though, because it'll have to deliver current one half of the time, and handle that same current coming back again the other half of the time. This current doesn't indicate real power consumption, but it is real current. And the more of this real current the mains grid has to handle, the thicker the wires have to be, the bigger the distribution transformers have to be, the more power will be wasted thanks to cable resistance, and so on."

    大意是:主动PFC电路作为电源中相对主电路独立的一个电路,虽然可以矫正功率因数,大大降低了无功功率的消耗,不过却会造成有功功率的一些损失,最明显的,带有主动PFC的电源相对于不带PFC或带有被动PFC的电源会浪费掉至少10%的电能转化成热量.

    换句话说,主动PFC的宣传的那么好:更能减少无功功率的损失,但实际上消耗更多的有功功率的事实却被掩盖了.

    有兴趣的朋友可以登陆观看E文全文,了解更多情况:http://www.dansdata.com/gz028.htm