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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
Newsgroups: sci.electronics.design
Subject: Re: power supply idea
Date: Mon, 22 Apr 2024 08:50:02 -0700
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On Mon, 22 Apr 2024 07:15:22 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:

>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.

I invented a control algorithm. All the buck chips that I know of are
all feedback driven, and will slam into either rail if the feedback
divider is broken. Blow things up.