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## Re: [Amps] HV Switch Mode Power Supplies

 To: "Will Matney" Re: [Amps] HV Switch Mode Power Supplies R.Measures Fri, 24 Jun 2005 20:13:38 -0700
 ```On Jun 24, 2005, at 5:42 PM, Will Matney wrote: > David, I was going for 1000 V, and was thinking 1 kV so must have > added it and didn't catch it. The graph on the website showed a 1000 V > drop over the range of 0-1 ampere. About every power supply I've built > using a transformer, with capacitor input, you can divide the no-load > voltage by 1.12 or 1.13 (12-13%) and generally find the full load drop > in voltage. That switching supply dropped by a third or about 30-35% > if I recall after looking at it yesterday +/- 100 volts give or take. > Take say 3500 Vdc using a standard HV transformer and a regulation of > 13%, it would be 3097 Vdc where you can see it's about 303 volts. This > 1000 volt drop would cause the plate resistance to swing all over the > place I would think. Correct, but most of the switcher supplies that I've seen have a feedback loop that maintains output V with changes in load-I. > > Best, > > Will > > > >> >> Will Matney wrote: >>> David, >>> >>> You are correct on the regulation. A regular transformer type >>> power supply when designed right will have a regulation >>> somewherre around 11-14%. In the case of the switching supply, it >>> looks like 30-35%. 1000 kV drop over 1 amp is a good bit of sag. >>> >>> Best, >>> >>> Will >> >> I would have thought that cause serious non-linearity problems on SSB. >> >> >> Having gone to a switch mode design, I would have thought they used >> some >> feedback to keep the voltage constant. But it seems not. Given the >> line >> voltage will probably sag too at 2.5kV, you can rekon on over a kV >> drop >> in practice. >> >> I assume you mean 1kV sag, or 1000V, and not 1000kV !! Reminds me of a >> lecturer I know who got fed up with the cleaners moving his equipment >> that worked from 12V. So he decided to put a sign on it >> >> "Danger, 1200000 uV" >> >> Apparently nobody touched it any more. >> >>> >>> ----- Original Message ----- >>> From: "David Kirkby" >>> To: "amps@contesting.com" >>> Subject: Re: [Amps] HV Switch Mode Power Supplies >>> Date: Fri, 24 Jun 2005 00:39:13 +0100 >>> >>> >>>> Steve Thompson wrote: >>>> >>>>> Winfried Kriegl wrote: >>>>> >>>>> >>>>>> http://www.wattsunlimited.com >>>>>> have a 2500W SMPS. Works fine. >>>>> >>>>> Looks very nice. >>>> >>>> But look at the regulation (or lack of). >>>> >>>> http://wattsunlimited.com/_wsn/page3.html >>>> >>>> >>>> -- >>>> David Kirkby, >>>> G8WRB >>>> >>>> Please check out http://www.g8wrb.org/ >>>> of if you live in Essex http://www.southminster-branch-line.org.uk/ >>>> >>>> >>>> _______________________________________________ >>>> Amps mailing list >>>> Amps@contesting.com >>>> http://lists.contesting.com/mailman/listinfo/amps >>> >>> >>> >> >> >> -- >> David Kirkby, >> G8WRB >> >> Please check out http://www.g8wrb.org/ >> of if you live in Essex http://www.southminster-branch-line.org.uk/ >> >> >> _______________________________________________ >> Amps mailing list >> Amps@contesting.com >> http://lists.contesting.com/mailman/listinfo/amps > > > -- > ___________________________________________________________ > Sign-up for Ads Free at Mail.com > http://promo.mail.com/adsfreejump.htm > > _______________________________________________ > Amps mailing list > Amps@contesting.com > http://lists.contesting.com/mailman/listinfo/amps > > Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
 Current Thread Re: [Amps] HV Switch Mode Power Supplies, (continued) Re: [Amps] HV Switch Mode Power Supplies, Iezzi Family Re: [Amps] HV Switch Mode Power Supplies, Winfried Kriegl Re: [Amps] HV Switch Mode Power Supplies, Steve Thompson Re: [Amps] HV Switch Mode Power Supplies, David Kirkby Re: [Amps] HV Switch Mode Power Supplies, Borislav Trifonov Re: [Amps] HV Switch Mode Power Supplies, wc6w@juno.com Re: [Amps] HV Switch Mode Power Supplies, David Kirkby Re: [Amps] HV Switch Mode Power Supplies, Harry Brown Re: [Amps] HV Switch Mode Power Supplies, David Kirkby Re: [Amps] HV Switch Mode Power Supplies, Will Matney Re: [Amps] HV Switch Mode Power Supplies, R . Measures <= Re: [Amps] HV Switch Mode Power Supplies, W0UN -- John Brosnahan Re: [Amps] HV Switch Mode Power Supplies, Will Matney Re: [Amps] HV Switch Mode Power Supplies, Will Matney Re: [Amps] HV Switch Mode Power Supplies, David Kirkby Re: [Amps] HV Switch Mode Power Supplies, R . Measures Re: [Amps] HV Switch Mode Power Supplies, Will Matney Re: [Amps] HV Switch Mode Power Supplies, Ian White GM3SEK Re: [Amps] HV Switch Mode Power Supplies, Will Matney