Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: john larkin Newsgroups: sci.electronics.design Subject: Re: switchmode gyrator Date: Sat, 16 Nov 2024 07:55:07 -0800 Organization: A noiseless patient Spider Lines: 34 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Sat, 16 Nov 2024 16:55:10 +0100 (CET) Injection-Info: dont-email.me; posting-host="ad9afb4bb3b32864f23a5e19a743500c"; logging-data="107988"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+FuNpNHSmXVrOs47pP77e3" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:gYyz2ICXkWOr19I4f7tQlSPvl+A= Bytes: 2169 On Sat, 16 Nov 2024 07:32:27 -0500, "Tom Del Rosso" wrote: >john larkin wrote: >> On Tue, 12 Nov 2024 19:44:39 +0100, Jeroen Belleman >> >> My customer is building giant rackmount boxes full of heavy inductors >> as part of his dummy loads. We want to replace them. >> >> Given a generalized switching impedance simulator, I guess one could >> model a DC motor. >> >> I am considering a powered impedance simulator, not the theoretical >> gyrator. Just sort of a gyrator. > >Better to make it a floating inductor instead of a grounded one like >gyrators are. > >Bob Pease shows how: > >https://youtu.be/AEJtajaRj_s?t=284 > >Turn THAT into a switcher and patent it. That's differential but not floating relative to the opamp power supplies. Every channel will of course need its own dc/dc converter, so it really looks like an isolated resistor+inductor to the customer. We do that a lot, floating circuits. The Coilcraft planar transformers are great for powering isolated stuff.