[Amps] HV Switch Mode Power Supplies

[Harry Brown]

Here's some more info on a "real" application of the Watts Unlimited power 
supply.

At the VHF Dinner at Dayton this year, K5AND gave a talk on a 6 Meter amp 
he designed using an 8877 for DXpedition purposes.

It uses a switching supply from Watts Unlimited and the total weight of the 
amp including power supply is 20 pounds.

His amp idles at 175 ma. with the plate voltage at 3.4 Kv. At full output, 
1.5 KW, the palate current is 3 Kv and the plate current is 850 ma. So the 
voltage swing is not all that terrible when compared to conventional power 
supplies. When the amp is not on, the power supply is keyed off.

73, Harry, W3IIT

I
At 01:16 AM 6/25/2005 +0100, David Kirkby wrote:

>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" <david.kirkby at onetel.net>
> > To: "amps at contesting.com" <amps at 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/
> >>
> >>
> >>_______________________________________________
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> >>Amps at 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/
>
>
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>
>
>
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