Re: cap firing voltage scope measurements question (tests)

• To: tesla-at-pupman-dot-com
• Subject: Re: cap firing voltage scope measurements question (tests)
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 20 Jun 1999 18:34:02 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
> 
> Hi John,
> 
>     I knew that LTR sync systems had a little voltage overshoot (a few
> thousand volts), however, I never realized that this overshoot could be so
> high.  This obviously needs more looking into especially for those of use
> that push cap voltages to the limit already!!  There are apparently
> resonant and timing effects that not only can support LTR caps but may also
> allow really destructive voltage rises to take place that we (at least I)
> did not expect!
> 
> Much more work to do here!!
> 
>     Terry

The charging mechanism is mentioned in Sargeant and Dollinger's "High 
Power Electronics". Don't have my copy with me so I can't name the 
pages but from memory it is in the section on power supplies. All 
along I have been disturbed by descriptions of ballasts as "current 
limiters" because while true, it overlooks the fact they also store 
energy in accordance with 0.5*L*Ipk^2, something which resistors 
don't do. Of course chokes are essentially lossless while resistors 
aren't so chokes are a most desirable way to go.

Malcolm
<snip>

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