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Old 15th Jun 2020, 4:05 pm   #9
Diabolical Artificer
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Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,639
Default Re: High voltage regulator circuit.

"Have you looked at the supplies used in the Sussex..." No, I will do though, thanks for the heads up Peter.

Thanks G, yep, I've tried to trawl through it too, after a while I zoned out, that's a good summation. There's another protection circuit that cuts power quickly if a valve starts pulling too much current, so hopefully that'll cover that type of fault, however valve regulation looks tempting, no room unfortunately.

I did and do look at SOA graph's when using trannies, but is Vds 420v? Vd = 420v but Vs = 300v so surely Vds is 120v? I was going to tweak this circuit by changing R2 after measuring Ig2. thanks for the info on CC operation, I find the thermal info on datasheets hard to get to grips with. I suspect a bigger fet is going to be needed for this job, there's eight 807 screen grids to supply.

Thanks for all your IP, Andy.
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