RussellMc wrote:
>> Yep.  Then note that there are two capacitors that bridge the
>> isolation boundary - treat them as being in parallel.
>>    =20
>
> In series, I think, in this context.
>  =20
They are in series from the perspective of the power being transmitted=20
by the circuit but they are in paralell from the perspective of leakage=20
current across the isolation barier.

The biggest problem I see with this circuit though is it's transient=20
response. A rapid change in the potential difference between the=20
isolated sides (say a spike on the mains if one side is tied to mains=20
live and the other to mains earth) will cause a spike of current through=20
the capacitors.

Remember the real equation for a capacitor is Q=3DCV differentiating this=20
with respect to time and knowing that current it is the rate of change=20
of charge gives us I=3DC(dV/dt) (for those who stopped studying maths=20
before taking calculus this means that the current though a capacitor is=20
proportional to the rate of change of voltage across the capacitor)
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.