Pico PSU

[bugeyewrx]

I've got a wide input pico psu that will accept 12v to 25v and a universal laptop power brick that will supply 15v to 24v so obviously I can set the brick to anything I want and it will still work .

What I'm wondering is does it make any difference at all what voltage I choose ? Is 24v better than 15v or the other way round or even something in between ?

 

[bugeyewrx]

I did think about P=VI but it's a 120W brick so more volts equals less amps ? .... then the pico psu does the whole P=VI thing again . My physic teacher was good but the 28 years that have past since he told me anything doesn't help .....

 

[bugeyewrx]

@jak731 .... I should have said it works fine more a question out of interest . No ampage ratings on either bit the the brick is 120W and the psu 80W (120W peak ) so the brick has plenty of power .

 

[bugeyewrx]

..... as quite often voltage conversion can be quite inneficient.

Hhhmm so my pico psu says it is 94% efficient so I suppose that extra 6% is being turned into heat , inside the case . The brick set to 15V give the psu less to do so less heat in the case ( and more from the brick ) ?

 

[bugeyewrx]

Funnily enough it is set at 19V just because it's the common laptop voltage .