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need 48vdc to 12 vdc converter | 14 comments (14 topical, 0 editorial)

Re: need 48vdc to 12 vdc converter (3.00 / 0) (#3)
by drdongle (Dr.Dongle1@juno.com) on Wed Jun 22nd, 2005 at 05:25:02 PM MST
(User Info)

48 to 12 volt DC to DC converters are fairly common, though 1KW is a bit on the high side. All Electronics ( www.allelectronics.com)has a unit Cat# PS-526 $19.00 ea, that may get you started the output for 12 volts is 10 amps so use 8 or 9 of them for multiple loads. You also get +5 at 25 amps and -12 at 1 amp this would also be good for an older PC to run off 48 V.
I have one and it seems that the connections were well labeled.
Carpe Vigor, Dr.D

Re: need 48vdc to 12 vdc converter (3.00 / 0) (#4)
by commanda (alwynne at unwired dot com dot au) on Thu Jun 23rd, 2005 at 03:28:51 AM MST
(User Info)

The cheaper voltage reducers are usually linear regulators. Current in = current out. If 48 volts in & 12 volts out, 3/4 of your energy is being dissipated in heat.

If it's got heatsink fins all over the outside, it is one of these.

Probably not much use to you, as shipping costs would kill you. Oatley electronics here in Australia have ex-telecoms switchmode supplies. 48 volts in & 24 volts out. 1Kw. The output can be changed to 12 volts fairly easily. They include a circuit diagram & instructions on how to modify (change a couple of resistors).

These supplies are used all over the world. Digging one up locally is a challenge I leave you to pursue.

Amanda

[ Parent ]

Re: need 48vdc to 12 vdc converter (3.00 / 0) (#7)
by joelhacker (joel dot hacker at motorola dot com) on Thu Jun 23rd, 2005 at 10:50:43 AM MST
(User Info)

If you are going to run multiple converters in parallel, you must use
resistors on the output of each side of the positive terminal so small
differences in their regulators don't drive eachother batty and one
regulator which is tweaked for a slightly higher voltage doesn't wind
up trying to pull up the other converters while their regulators tries
to pull the high one down, and slowly one-by-one your bank of converters
kills each other off (of at least constantly blowing all the fuses).

[ Parent ]

Re: need 48vdc to 12 vdc converter (3.00 / 0) (#9)
by drdongle (Dr.Dongle1@juno.com) on Thu Jun 23rd, 2005 at 06:47:31 PM MST
(User Info)

I just got the latest Astrodyne catalog ( www.astrodyne.com, 800 823 8082 ) their model SD350C-12 is 350 watts (27.5 A @12V out) price is $129.00 in small quantities, you would only need three of these.
Carpe Vigor, Dr.D
[ Parent ]

need 48vdc to 12 vdc converter | 14 comments (14 topical, 0 editorial)

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