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20A 24v to 12v DC voltage dropper

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April 5th 06, 05:12 PM posted to rec.radio.amateur.homebrew

Lawrence Statton N1GAK/XE1

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20A 24v to 12v DC voltage dropper

writes:
Hi all,

Just bought this power supply and it turns out to be 24V as opposed to
12 as I'd hoped. It's a heafty beast and should be good for running my
HF mobile if I can drop the voltage down to 13.8 whilst retaining about
20 amps for the rig's TX current draw. I know I can buy a commercial
dropper, but that'd be cheating, so can anyone suggest how I might
acheive such a device through HB-ing? Which active devices would be
best for this purpose? I'd like over-voltage protection built-into any
design put forward if possible. Any pointers, please.

What you're saying is: You want to build a 20A 13.8V power supply with
OVP. That it happens to take 24Vdc instead of 120Vac is trivial.

Your options are -- design a nice switching converter (which based on
the tenor of your question is beyond your mettle at the moment) or
build an enormous linear regulator and dissipate a couple hundred
watts making a very nice place for the cat to nap

Best to set that
24V supply on the shelf, hope some day to find a good use for it, and
either buy or build a 13.8V supply from scratch.

Thanks!

--
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Lawrence Statton - m s/aba/c/g
Computer software consists of only two components: ones and
zeros, in roughly equal proportions. All that is required is to
sort them into the correct order.

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