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From: "Don" <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: power supply idea
Date: Mon, 22 Apr 2024 12:57:22 -0000 (UTC)
Organization: A noiseless patient Spider
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John Larkin 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

Is your "spread spectrum" dodad supposed to mitigate EMI?

Danke,

-- 
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.