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From: "Frithiof Andreas Jensen"
Subject: Sv: 12kV 8kW metal-evaporation power supply
Date: Tue, 19 Nov 2002 20:09:39 +0100
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Organization: TDC Internet
Winfield Hill skrev i en
>I also suggested an interlock set to operate
> if inadequate current is present in the bleeder chain.
I would suggest he uses two chains: One for bleeder and safety interlock
with somewhat limited acurracy, frequency compensation etc. (basically a
string of resistors) and one for the voltage feedback loop with decent
resistors and compensating capacitors.
The supply should trip is the voltage measured at one chain is significantly
different from the other chain, say 10% f.ex.
I used 1M Ex$$pensive Caddock resistors a lot in former times - also there
are some el-cheapo, but decent metal film "flat, 1%, 1 W blue ones"
Bourns(?) that can be had in a 3.5 kV and a 10 kV version.
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