來自國外網站http://www.dansdata.com的一個命為PFC decoded的文章中,我們節選了以下2段內容:

"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:主動PFC電路作為電源中相對主電路獨立的一個電路,雖然可以矯正功率因數,大大降低了無功功率的消耗,不過卻會造成有功功率的一些損失,最明顯的,帶有主動PFC的電源相對于不帶PFC或帶有被動PFC的電源會浪費掉至少10%的電能轉化成熱量.

    換句話說,主動PFC的宣傳的那么好:更能減少無功功率的損失,但實際上消耗更多的有功功率的事實卻被掩蓋了.

    有興趣的朋友可以登陸觀看E文全文,了解更多情況:http://www.dansdata.com/gz028.htm