A pair of car batteries used on a /P expedition could easily
discharge to 20V. The modern high power DMOS devices (for
1.3, 2.3 and 3.4 GHz) that this PSU is aimed at powering
like a constant 28V Vcc so a straightforward SMPSU looks the
obvious solution. If two batteries have to be used, then
used in parallel they can be charged together from a car engine.
Also, the same PSU design can be adapted for 50V devices
which would need 4 batteries in series.
Andy G4JNT
> -----Original Message-----
> From: Nick [mailto:[email protected]]
> Sent: 2001-02-01 11:39
> To: [email protected]
> Subject: Re: LF: RE: 3C85 Material: Obsolete?
> On Wed, 31 Jan 2001 14:55:04 -0000, you wrote:
>
> >As part of a project for the other end of the spectrum, I'm in the
> >process of designing a 300 - 400W SMPSU for converting a 12V
> car battery
> >supply to 28V so will be looking into similar sized cores as
> needed for
> >137kHz kW systems.
>
> How about a second car battery in series?? You can add a
> small invertor to
> charge it off the original is you want long term operation
> with the engine
> running.
>
> Nick
>
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