RE: Another Terry's filter question - MOV capacitance

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Hi Terry:

Your post about the MOV capacitance scared me - I never looked into
that.  If I had double the losses due to MOV capacitance, that may be
significant, particularly in a static gap with a high BPS.  I re-checked
the MOV data sheet, and it specs a maximum value of 70 pF per device.  I
measured 4 loose pieces, and they all fell between 39 & 40 pF (anywhere
between 120 Hz-100KHz).  So in an 8-MOV string, I'm seeing only 5 pF.  I
think the additional losses due to MOV capacitance are negligible, and
we can definitely rule out the possibility of using the MOV capacitance
in place of a separate bypass cap.

Regards, Gary Lau
MA, USA


> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> The MOVs also act like capacitors normally.  I
> forget the value, but I think it is close to the
> caps.  So they add another say 4 watts.
>
> Cheers,
>
>          Terry