Re: SSTC DC blocking caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dan Strother" <dstroth-at-hotmail-dot-com> 

The DC blocking caps in series with the primary are not integral to normal 
operation. In fact, they have no affect on normal operation, so long as 
they are well above the resonant capacitor match for the primary (1uF or so 
is a typical blocking cap value in a mains powered SSTC).

They are there in the event that the bridge stops switching, and power is 
applied to the primary coil for an extended period of time. Without the 
blocking caps, the primary would appear as a short, resulting in the 
potential death of your switching devices.


Dan Strother



>Original poster: "chris swinson" <exxos-at-cps-games.co.uk>
>
>Hi all SSTC ppl!
>
>am I right in thinking the DC blocking caps are only there so the coil 
>will only draw power at Fres ? I wonder what would happen if I took them 
>out and drove the coils direct. I imagine as long as the frequency is near 
>Fres then it wont draw any more power and short out the outstage, comments ?
>
>Cheers,
>Chris

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