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Path: ...!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" <invalid@invalid.invalid> Newsgroups: sci.electronics.design Subject: Re: 200V at 10mA Date: Tue, 27 Aug 2024 00:05:31 -0400 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 40 Message-ID: <vajjac$ejt$1@nnrp.usenet.blueworldhosting.com> References: <va558r$2lno$1@nnrp.usenet.blueworldhosting.com> <vae8ql$1o845$1@dont-email.me> Injection-Date: Tue, 27 Aug 2024 04:05:32 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="14973"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:5dvuYN6/DcpxX7L6Ma9HvSkS/x8= sha256:qXiDKBNfJKDnEl+KcWk5qbCwgEHzTKFCGthKX4+mGvs= sha1:2BSciG1lLNKVFkebXbdQ+NJvaq8= sha256:iC4ZkSlLE/8YsSKmyR83KVrvdkk5mJ8LW4i7RnppUcs= X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-Priority: 3 X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-MSMail-Priority: Normal X-RFC2646: Format=Flowed; Response Bytes: 3081 "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vae8ql$1o845$1@dont-email.me... > On 22/08/2024 2:39 am, Edward Rawde wrote: >> Is there an off the shelf part I can use for the transformer in this? >> >> It's based on a design someone else posted in this group a long time ago (maybe 10 years ago by now). >> I can't remember the name of that individual. > > <snipped .asc file> > > There's a more elegant solution to that problem that was discussed here a few yeas ago. > > sci-hub.do/10.1109/tpel.2007.909192 > > Abramovitz, A., & Smedley, K. (2007). A Resonant DC-DC Transformer With Zero Current Ripple. IEEE Transactions on Power > Electronics, 22(6), 2344-2351. doi:10.1109/tpel.2007.909192 > > It's essentially the Baxandall class-D oscillator with two extra windings on the feed inductor. The paper talks about integrating > all the windings on single - carefully gapped - I-E core, but using two cores gives you an easily designed way of getting to the > same advantage. > > At the time I posted an LTSpice simulation that made the point. The output wasn't entirely ripple-free, in that there were > switching transients which would have had to have been filtered out, but that needed a much smaller R,L and C values than you'd > have need to get rid of the switching frequency components. > > It won't be attractive if you have a pathological fear of transformers or an aversion to winding them yourself a or finding a > nearby transformer winding shop to wind a few of them for you. > > For volume production you'd use printed windings, but thye need a specialist supplier too. Thanks I'll have a look. I haven't done much for the past two days due to a touch of Covid. I have no fear of transformers or winding them myself but I'd have to admit that some of the work I could do 40 years ago might be best avoided now. > > -- > Bill Sloman, Sydney