What about rfi filtering? No good having such a supply if it wipes out
most of the hf spectrum!!!
John ZS5JF
----------
> From: km1h@juno.com
> To: amps@contesting.com
> Subject: Re: [AMPS] HV Switching Supply
To: <amps@contesting.com>
> Date: 01 February 1999 12:19
>
>
>
>
> On Sun, 31 Jan 1999 13:56:53 EST Radio WC6W <wc6w@juno.com> writes:
> >
> >
> >On Sat, 30 Jan 1999 21:04:47 -0500 km1h@juno.com writes:
> >
> >Hi Carl,
> > A worthy project.
> >
> >
> >>Input: 90-260VAC @ 47-440Hz
> >
> > PFC Boost input topology I presume?
>
>
> Provision for soft-start??
>
> Inherent in the design
>
>
> >
> >
> >>Output: 2000, 2250, 2500VDC at up to 1A PEP
> >
> > H Bridge? FET's or IGBT's?? What switching frequency???
>
> Undecided. Also looking at a doubler which offers some plusses.
> Freq pbly 80-100KHz in order to maximize available ( cheap) cap
ESR's.
>
>
> >
> > Output protection? SInce the output capacitor is somewhere in
the
> >neighborhood of .1uF you should be able to build in some real
> >"glicch"
> >protection for the benefit of both the tubes and the transistors.
>
>
> Yep, all of the above are in the draft. The end result will of course
be
> cost driven but a packaged PS ready to drop in to an OEM amp will
have
> all the bells and whistles they want.
>
>
>
>
> >
> >
> >> User selectable xfmr taps.
> >>About 5% worse case regulation, open loop.
> >
> > Are you planning to close the loop?
>
> Not necessary for the application; at full draw regulation will be
<5%,
> less current better regulation. It will be less complicated to do the
> regulation in the xfmr design.
>
>
> >
> >
> >>Xfmr: Planar construction
> >
> > Oooh, modern! Where do the parts for that come from?
>
> Very modern !
> All parts from USA which is way ahead of Asia, etc in HV
applications.
>
>
>
>
> >
> >>Output: 300-400VDC adjustable @ 50ma, .25% regulation
> >>Output: -25 to -150VDC @ 50ma adjustable. .25% regulation
> >>Xfmr: conventional pot core
> >
> > Is this driven from a separate output circuit? I have found it
> >safer over the years to source the grid bias independently from the
> >plate &
> >screen with appropriate interlocks.
>
> Completely independent from the HV which is strictly planar
construction.
> The screen and bias can be from the same one tho at such low wattage
and
> are conventional cores.
> Metering points plus current/voltage protection are a given.
> Also considering 6.3V @ 6A filaments for most of the 250-400 series
> tetrodes and a pair of 8874's.
>
> End result, dependent upon cost, may be a universal PC board with
various
> options for the tetrode vs triode user.
>
> Still in the thinking mode so keep the ideas flowing. Trying to cover
a
> fairly wide range of user requirements in one unit is an interesting
> challenge but very doable as long as the end user has the mental
ability
> to select the right jumper, etc. Is that too much to expect?!? Some
> recent posts make me wonder !!
>
>
> 73 Carl KM1H
>
> .
>
>
> >
> > Well, those are my "first look" comments. Good luck with the
> >project!
> >
> >73, & Happy Sunday
> > Marv WC6W
> >
> >
> >
> >
> >
> >*
___________________________________________________________________
> >You don't need to buy Internet access to use free Internet e-mail.
Get
> >completely free e-mail from Juno at http://www.juno.com/getjuno.html
> >or call Juno at (800) 654-JUNO [654-5866] -- FAQ on WWW:
> > http://www.contesting.com/ampfaq.html Submissions:
> >amps@contesting.com Administrative requests:
> >amps-REQUEST@contesting.com Problems:
> >owner-amps@contesting.com Search:
> >http://www.contesting.com/km9p/search.htm
>
> ___________________________________________________________________
> You don't need to buy Internet access to use free Internet e-mail.
> Get completely free e-mail from Juno at
http://www.juno.com/getjuno.html
> or call Juno at (800) 654-JUNO [654-5866]
>
> --
> FAQ on WWW: http://www.contesting.com/ampfaq.html
> Submissions: amps@contesting.com
> Administrative requests: amps-REQUEST@contesting.com
> Problems: owner-amps@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|