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From: jasen on 14 Aug 2006 04:10 On 2006-08-13, meow2222(a)care2.com <meow2222(a)care2.com> wrote: >> > >> > Now to get 66.7v dc peak you need 66.7 / 1.414 = 47v ac. >> > >> > To get +-50v dc you need the same transformer, no reason to have 2 >> > windings at all. So you just need one 50v winding. >> >> >> ** So a two diode voltage doubler ?? > > dont be dense. so how do you get +/- 50V from a single 47V secondary You can call it two half-wave rectifiers but it's the same circuit as a voltage doubler, and it puts a common mode ripple on the power rails Bye. Jasen
From: joseph2k on 14 Aug 2006 06:45 Bud-- wrote: > I ran across info on rectifier design up through filtering (but not > regulation) at: > http://www.ieeta.pt/~alex/docs/ApplicationNotes/Rectifier%20Applications%20Handbook.pdf > It is: Rectifier applications handbook - 272 pg - 2MB > From a brief scan it looked very good and more than anyone here wants > to know about rectifiers, including the physics. > > A paperback book for transformers: > Practical Transformer Design Handbook; Eric Lowdon; published by Howard > W Sams; 240 pages; 8x11"; my copy is 1981. > It is aimed at experimenters designing single transformers using > salvaged cores. I thought it was very good. It may be hard to find, but > with the internet who knows. > > bud-- I took a look at the ieeta handbook. Yipee, this is something i want. You are right about the heavy physics, not for everybody. Thanks -- JosephKK Gegen dummheit kampfen die Gotter Selbst, vergebens. --Schiller
From:
John Woodgate on 14 Aug 2006 06:40 In message <ebpb61$4s3$2(a)gonzo.homenet>, dated Mon, 14 Aug 2006, jasen <jasen(a)free.net.nz> writes >You can call it two half-wave rectifiers but it's the same circuit as a >voltage doubler, and it puts a common mode ripple on the power rails What do you mean by 'common-mode ripple'? -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
From: meow2222 on 14 Aug 2006 06:53 jasen wrote: > On 2006-08-13, meow2222(a)care2.com <meow2222(a)care2.com> wrote: > >> > Now to get 66.7v dc peak you need 66.7 / 1.414 = 47v ac. > >> > > >> > To get +-50v dc you need the same transformer, no reason to have 2 > >> > windings at all. So you just need one 50v winding. > >> > >> > >> ** So a two diode voltage doubler ?? > > > > dont be dense. > > so how do you get +/- 50V from a single 47V secondary > > You can call it two half-wave rectifiers but it's the same circuit as > a voltage doubler, and it puts a common mode ripple on the power rails > > Bye. > Jasen 2 diodes, half wave rectification. That way the OP can get 5A 50v or 2.5A +/- 50v. Which may or may not be what he wanted, and almost certainly isnt what he now wants, or needs. NT
From:
John Woodgate on 14 Aug 2006 07:39
In message <WuYDg.9847$FN2.3842(a)newssvr14.news.prodigy.com>, dated Mon, 14 Aug 2006, joseph2k <quiettechblue(a)yahoo.com> writes >I took a look at the ieeta handbook. Yipee, this is something i want. >You are right about the heavy physics, not for everybody. Thanks There are also a lot of 'mistakes' in it. Schade's curves, for example, were derived in 1943 for valve/tube rectifier diodes and aren't correct for semiconductor diodes, which have a much lower 'on-state' resistance. Some of the waveform diagrams are positively weird, and don't aid understanding at all. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK |