Path: csiph.com!feeder.erje.net!2.us.feeder.erje.net!news.glorb.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!spln!extra.newsguy.com!newsp.newsguy.com!drn From: Winfield Hill Newsgroups: sci.electronics.design Subject: Re: 5 to 10kV rated gate transformers Date: 2 Jun 2017 14:02:05 -0700 Organization: Rowland Institute Lines: 49 Message-ID: References: <592f1e94$0$8852$426a74cc@news.free.fr> <309fdaf8-1982-42da-95ef-792a528f3843@googlegroups.com> <4fa3jcl0vq5sufdv7m2j64s046n97mk4jm@4ax.com> NNTP-Posting-Host: p41fc9f3d3df3ded00d8f73794ae4ecdef95f024ffb651e09.newsdawg.com User-Agent: Direct Read News 5.60 X-Received-Bytes: 2379 X-Received-Body-CRC: 2056875795 Xref: csiph.com sci.electronics.design:462746 John Larkin wrote... > Joerg wrote: >> John Larkin wrote: >>> >>> I like the idea of drum cores or pot cores on opposite >>> sides of a PCB, but nobody else seems interested. >>> Imagine just a couple of cheap pick-and-place >>> inductors doing the job. >> >> AFAIK you can't buy an open half pot core as a >> standard part. I'd be all ears if you could. > > They come in pairs, and the circuit would need two. > Using pot core halves on opposite sides of the board > does require terminating windings manually, and > securing the cores to the board somehow. Yes, but interesting idea, I like it. Epoxy. > Some standard surface-mount inductors would be > a lot better for production. > >> Upright unshielded rod inductors, yes, but their >> spew around EMI to no end. They are like a dirt >> bike with the muffler sawed off. Eww! > I designed one electric meter for a giant northeast > utility. It had to be read out without line power > (this was to go into a country where the power was > erratic) so the readout wand used magnetic coupling > for data and to briefly power up the meter. I used > flat rod-type inductors on both ends, resonated, > which gave pretty good coupling when they were > parallel, maybe an inch apart. What kind of power-coupling did you get? "flat rod-type" what does that mean? I couldn't find available ferrite shapes for the HV design concepts I played with. "bar and frame" sounded good, but I couldn't find inventory given that CCFL went out of flavor. Not even on Alibaba. -- Thanks, - Win