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From: Martin Rid <martin_riddle@verison.net>
Newsgroups: sci.electronics.design
Subject: Re:dc/dc startup
Date: Tue, 14 Jan 2025 10:19:01 -0500 (EST)
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john larkin <JL@gct.com> Wrote in message:r
> https://www.dropbox.com/scl/fi/3hyvmc3mkvhrk6rc8dt72/P970_DC-DC.jpg?rlkey=npgerceq4t191hnjfd0907v6u&raw=1That makes two isolated 56-volt power supplies. But  the problem ishow to start it up.I could just slam on the square wave drives and let the TI chipcurrent limit until the caps charge up. That might work.I was thiking I could start the two half-bridges with in-phase squarewaves and then slowly slide them out to 180 degrees. My FPGA kidscould do that. That would be a nuisance to Spice.We did a similar supply a while back with discrete fets, no currentlimits. Startup made 300 amp spikes that made all sorts of problems.

Yea, software softstart.

Cheers
-- 


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