24v from 12v psu elementary question

Thread Starter

robinb

Joined Sep 1, 2017
12
hi

I have a meanwell 250w 12v PSU that came with a 200w 24v led light with a dimmer
The power supply gets Really hot
I emailed the manufacture who said the dimmer steps up the voltage to 24v with a voltage regulator

My elementary electronics knowledge tells me that I should only be able to at best get 125w at 24v
and so is overloaded

Do switch mode psu work in this way or am I missing something

Thanks

Robin
 

Thread Starter

robinb

Joined Sep 1, 2017
12
How much power would I be able to get via a 12-24v converter of some type ?

Is 125w in the ball park ?

Thanks

robin
 

Dodgydave

Joined Jun 22, 2012
8,477
Your problem is when you use a converter, you use more current in the primary source to give the secondary supply, due to losses, so your led is 24V 200W, thats 8Amps output, so you're looking at drawing say 9 or 10 Amps.
 

Thread Starter

robinb

Joined Sep 1, 2017
12
Your problem is when you use a converter, you use more current in the primary source to give the secondary supply, due to losses, so your led is 24V 200W, thats 8Amps output, so you're looking at drawing say 9 or 10 Amps.

So I’m correct in thinking they would need to supply at least a 400w 12v psu and that the 250w unit is very underrated ?

Robin
 
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