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

 To: amps@contesting.com Re: [Amps] HV Switch Mode Power Supplies "Will Matney" Fri, 24 Jun 2005 19:42:55 -0500
 ```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. 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 ```
 Current Thread Re: [Amps] HV Switch Mode Power Supplies, (continued) Re: [Amps] HV Switch Mode Power Supplies, David Kirkby 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