wjdashwood
asked on
Is load the only thing that affects the amount of heat a PSU generates?
Title says it all really. Basically I'd like to know if power load on a power supply is the only thing that affects the amount of heat it generates. For example, will a 500W PSU generate the same heat as a 200W PSU if they are both connected to exactly the same equipment?
Perhaps a 500W is more efficient and so doesn't generate as much heat at a given load? My main reason for asking is just out of interest but it's worth knowing these sort of things when I'm choosing components for a micro PC I'm building.
Many thanks!
Will,
http://wjdashwood.co.uk/
P.S. I don't suppose anyone knows where I can get hold of the JRex range of tiny single board computers?
Perhaps a 500W is more efficient and so doesn't generate as much heat at a given load? My main reason for asking is just out of interest but it's worth knowing these sort of things when I'm choosing components for a micro PC I'm building.
Many thanks!
Will,
http://wjdashwood.co.uk/
P.S. I don't suppose anyone knows where I can get hold of the JRex range of tiny single board computers?
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
In theory kronostm is correct but in practice what he says is not the case. A 500W PS has bigger "iron" and will have greater hysteresis loss under all load conditions vs. the 200W supply.
The different will not be great but is easily measurable. I'd estimate that you'll see power dissipation of about 10% greater for the 500W supply than the 200W one under identical loads.
The different will not be great but is easily measurable. I'd estimate that you'll see power dissipation of about 10% greater for the 500W supply than the 200W one under identical loads.
ASKER
What does greater hysteresis loss mean? I thought hysteresis was the behaviour of say a thermostat when it turns on a one temperature but turns off at another so that it doesn't fluctuate when around the threshold temperature.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
An excellent explanation! Truly raised the intellect level there for a brief moment ;) and well deserving of some points. In fact, an increase is due me thinks.
Thanks for all the help.
Thanks for all the help.
thank you jhance for completing this Q.
I tried to explain in the easy way why the amount of energy loss should be equal. I stated that there actually IS a difference , and considered it insignificant.
In the given conditions 10% seems to me in an acceptable range , however I personally doubt it's 10%, but there's no need to contradict since a calculation on this loss can be made only with detailed technical specifications, so , that'ss just an appraisal ...
I tried to explain in the easy way why the amount of energy loss should be equal. I stated that there actually IS a difference , and considered it insignificant.
In the given conditions 10% seems to me in an acceptable range , however I personally doubt it's 10%, but there's no need to contradict since a calculation on this loss can be made only with detailed technical specifications, so , that'ss just an appraisal ...
kronos,
Agreed that 10% is just a "WAG". It's likely in that range on an "order of magnitude" level. I'm sure that 1% is way too low, 100% way too high.
Agreed that 10% is just a "WAG". It's likely in that range on an "order of magnitude" level. I'm sure that 1% is way too low, 100% way too high.
:-)
ASKER
Cheers,
Will