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From: John Popelish
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Subject: Re: Capacitors for high current high voltage pulse
Date: Thu, 31 Oct 2002 00:36:37 GMT
NNTP-Posting-Date: Wed, 30 Oct 2002 19:36:37 EST
Darrell Harmon wrote:
> I need a 1500V 0.3uS pulse to power a flashlamp. It is an EG&G FX-280
> in one of those trigger sockets. I see CDE DME series caps (Metallized
> Polyester) in the mouser catalog that look good, but it says the
> maximum pulse dv/dt is 70V/uS. I will have about 2500V/uS assuming I
> use two 1KV .22uf caps in series. Thats 550 Amps. I will only be
> firing about 1 pulse per second so will these caps be harmed? Another
> cap option are some 800V .56uf mylar caps that I found surplus. I
> have no info on them. Would they be better? If you have any other
> suggestions that would be great, but it needs to stay cheap since I am
> a college student with a limited budget. Yes, I know this is high
> voltage. Power will only be applies when it is in its plastic box
> with the lid on for safety.
> Darrell Harmon
Since both series resistance and lead inductance get involved at these
high currents, I would look into stacking a bunch of cheap Y5P 2000
volt ceramic capacitors in parallel. You can get 20 each of 5600 pf
caps from Digikey for about $28. But that asks each to put out only
about 27 amps peak. The trick is to mount them so that the inductance
to each is minimized and matched.
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