jwong852

回復  jwong852

c-hing, why some psu has 1 大水塘(400v or 450vx1), some psu has 2大水塘(200vx2)? th ...
sunschow 發表於 2011-6-28 14:21

舊式無APFC, 有110V/220V選擇掣, 就一定係2粒, >=200V電容.

有APFC, 用一粒400V電容就夠, 110V或220V輸入, 都係升壓至350-400V.
但有D有APFC都用2粒:
A. 2粒400V電容, 並聯以增加容量.

B. 2粒200V電容串聯, 以達至400V耐壓, 可能2粒200V電容平過1粒400V電容啩.
    但呢個方法唔好, 當2粒200V電容特性相差得遠, 平衡唔到, 受高壓果粒會死先.
    我都見過其中一粒平衡電阻燒了, 引至死CAP.

tw.tw

就快砌機﹐仲諗住買Antec Neo ECO 450W﹐而家都唔知轉邊隻好!  各位有無介紹?

oscarlam

樓主好勁



P.S. 修理一次要幾$?

sunschow

回復 11# jwong852

thanks for ur reply.
btw, if my psu have 2 x 200 v 680uf replaced by a 400 v cap.is it possible? if yes, what kind of cap. for replacement? thx

jwong852

回復  jwong852

thanks for ur reply.
btw, if my psu have 2 x 200 v 680uf replaced by a 400 v cap.is ...
sunschow 發表於 2011-6-28 22:01

Two 680uF 200V cap in series equal to one 340uF 400V cap.

Does your power supply have APFC ?
1. If not, you can change to one 400V cap, but the power supply can only work at AC220V but not 110V any more.

2. If yes, you can change to a 400V cap. You can use a higher capacitance one as long as it can fit in. However the holes and soldering points may not be fit.

jamesy

話時話而家d smd電容質量參差。如果隻牛用customer ic(沒用datasheet提供)就幾難修好

sunschow

回復 15# jwong852
thanks for ur reply.
ref. to attachment, it should be passive pfc,
if without this, the psu should have active pfc.right?

jwong852

回復  jwong852
thanks for ur reply.
ref. to attachment, it should be passive pfc,
if without this,  ...
sunschow 發表於 2011-6-29 00:21

Yes, this is Passive PFC, using two 200V cap. This power supply should have a 110/220V input selector.

Unless those 200V caps are unbalanced, changing to single 400V doesn't help.
Moreover, the size of one 400V (with equivalent capacitance) will not fit the space of two 200V caps.

chinwah

睇完個結論真係  一粒曱甴屎,影響成碗粥

KwokAngus

Antec NEO ECO 用cost-down 版Seasonic S12II-Bronze Platform
Antec HCG High Current Gamer Series 都係... cost-down 少啲咁解~