Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: john larkin <JL@gct.com>
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: <fofhjjl1tqr9qj6grm719nqgfvtodaig8j@4ax.com>
References: <onquijt47loo1c3krbof1mpq0l16a8afqv@4ax.com> <rbj6jjt0tm8m6kjmnp7akojmshrhbo3uop@4ax.com> <evt6jjh8utojvc9ugmi54f0qp8aehfka93@4ax.com> <vh07fo$1nq2q$1@dont-email.me> <ktj7jjhg6is1vttu0vu8oqi966225b5qnm@4ax.com> <vha3cu$vpe$1@dont-email.me>
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"
<fizzbintuesday@that-google-mail-domain.com> 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.