Author Topic: Those 48V-input DC-DC power supplies... What do you DO with them?  (Read 819 times)

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Offline westfwTopic starter

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Those 48V-input DC-DC power supplies... What do you DO with them?
« on: September 02, 2020, 12:37:24 am »
When Dave talks about salvaging parts from his dumpster-diving find, he always says "I'd definitely save the DC/DC converters."  An I always have as well...  They're also widely available on the surplus market for shockingly low prices.

But ... what do you DO with them?  Usually they're "telco system" supplies, with a nominal 48V input.  Which is generally NOT a very convenient voltage for hobbyist projects, or even prototyping anything (other than telco gear, I guess.)  Also, *minimum* output current tends to be pretty high.
 

Offline NiHaoMike

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Re: Those 48V-input DC-DC power supplies... What do you DO with them?
« Reply #1 on: September 02, 2020, 01:27:09 am »
But ... what do you DO with them?  Usually they're "telco system" supplies, with a nominal 48V input.  Which is generally NOT a very convenient voltage for hobbyist projects...
Very convenient for home solar setups and small electric vehicles like bicycles and go carts. Audio amplifiers as well, although in that case it usually makes more sense to have a separate power supply for the logic.
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Offline digsys

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Re: Those 48V-input DC-DC power supplies... What do you DO with them?
« Reply #2 on: September 02, 2020, 01:53:33 am »
Not to forget - everyone is moving to PoE and so are vehicles (4x12V). I already service many installations that are 48VDC bus - they've dumped 240VAC, and all other DC voltages. I make up several DIN rail 48VDC <> xx modules, which are becoming quite popular. Oh yeah, and solar as mentioned
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Offline TheMG

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Re: Those 48V-input DC-DC power supplies... What do you DO with them?
« Reply #3 on: September 02, 2020, 02:05:38 am »
Another example, I'm building an HF linear RF amplifier (for amateur radio) which uses LDMOS transistor running at 50V, needed some DC-DC converters to provide the lower voltages for the control logic so the complete unit can be powered from a single (external) 48V nominal supply.
 


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