--===============1152632977==
Content-Type: text/plain; charset="gb2312"
Content-Transfer-Encoding: quoted-printable
X-MIME-Autoconverted: from 8bit to quoted-printable by pch.mit.edu id n4668Pev005672



Hi:


  I've made a power factor corrected battery charger, basically just a PF=
C boost converter as a front stage, and a flyback converter as the second=
 stage. They share the same circuit ground---the rectifier ground,except =
for flyback secondary.

  There was one interesting thing, and I cannot explain. When I attach a =
scope probe ground to the circuit ground, the output load will drop. This=
 happens when I place the probe ground to many obvious circuit ground poi=
nts.

  I am using constant voltage load, so what I mean load drop is that the =
load current drops, say from 2.5A to 2.4A when the scope probe ground is =
attached, but will recover to 2.5A when removed. Other performace does no=
t change much.

  Any opinion on what could have happened? Is it my layout problem? I won=
der if this will affect some probing results.

  Regards

_________________________________________________________________
=C9=CFMClub=BA=CDMessenger=BA=C3=D3=D1=D2=BB=C6=F0=B6=BC=CA=D0=D1=B0=B1=A6=
=A3=A1
http://club.msn.cn/?from=3D1
--===============1152632977==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Disposition: inline
Content-Transfer-Encoding: 7bit

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist

--===============1152632977==--