Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sun, 21 Apr 2024 22:03:03 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: power supply idea Date: Sun, 21 Apr 2024 15:01:16 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 22 X-Trace: sv3-Xs8OnRt1glLWBF5Pnk38AaJwYUDWm/YKR4/JlA9NoflDW1YJDscmCwBq1ycs9L2jX6qSS+XiffaSKER!rP4Hu4LX5P0h85mAOmSB0pyTmVKph34M8AswXMLTJdz7bFpogsL9Hd5QLimeVtL3/1mbU/+C8vfy!BqRrKA== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2001 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