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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: power supply idea
Date: Mon, 22 Apr 2024 07:15:22 -0000 (UTC)
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John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
> 
> If one had, say, a 48 volt power bus, you could hang a half-bridge
> switcher to ground, and a lowpass filter out. If the drive has duty
> cycle n, the output voltage is 48*n. So we have a programmable power
> supply with no feedback, which will be stable into any load.
> 
> The load regulation will be mediocre, but we could almost sell it
> as-is.
> 
> So now, sense the output voltage and compute the error against the
> target, run through a slowish integrator, and tweak the PWM to get
> zero output voltage error. Gross transient response is basically the
> response of the output filter, with some modest drool from the
> integrator.
> 
> We can constrain the influence range of the integrator, just enough to
> give the regulation that we need. That limits output swing in case the
> feedback is wrong, as one could get from a botched remote sense
> connection.
> 
> https://www.dropbox.com/scl/fi/2fysyvkl4eim7vujhaobh/FFINT_PS_1.jpg?rlkey=rug6yi3cgemi9vvbz8apgboqi&raw=1
> 
> 

Looks like you have invented the buck converter.


-- 
piglet