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From: Hul Tytus <ht@panix.com>
Newsgroups: sci.electronics.design
Subject: Re: 1KV buck converter
Date: Tue, 27 May 2025 00:39:34 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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References: <qi313kpbd526jk50v16ec57enpvnpbfbeb@4ax.com> <100q880$5r5l$1@dont-email.me>
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Bill - there was some talk here about a power supply I was working on. It used a pnp transistor
driven by 2 capacitors and a diode to switch a solenoid style inductor. Efficiency was about 80%. This
was two or three years ago. Initial starting powrer can be a puzzler.

Hul


Bill Sloman <bill.sloman@ieee.org> wrote:
> Newsgroups: sci.electronics.design

> On 24/05/2025 1:05 am, john larkin wrote:
> > 
> > https://www.dropbox.com/scl/fi/f64mv46qk4g4nca00bgoe/1KV_Buck.jpg?rlkey=f0qnaliz7nyoowe6w4wx2gkua&raw=1

> Anther one of John Larkin's pencil sketches - no resistances, no 
> inductances or capacitances and part numbers only for the transistors.

> At least with an LTSpice .asc file you get that stuff automatically.

> And you get some hint at the switching spikes, which can be nasty.

> -- 
> Bill Sloman, Sydney