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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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Old 04-11-2018
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Default response time

Just read

"A linear power supply features a transient response time up to 100 times faster than its switch-mode counterpart, which is important in certain specialized areas."
https://www.circuitspecialists.com/l...power_supplies

Maybe this is part of the problem some people are seeing with switched mode power supplies having problems keeping up.

Last edited by ashiekh; 04-11-2018 at 06:45 PM.
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Old 04-11-2018
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That's one positive to one thousand negatives. :-D
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Old 04-11-2018
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I was thinking that maybe some switched mode power supplies needed to be faster or have larger secondary capacitors.
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Old 04-12-2018
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But why? I mean, what would be practical benefit to a typical end-user?
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I am wondering if the problem with the Seasonic is related to this speed, or lack thereof.

Perhaps it was my error for not saying so explicitly at the start.

Last edited by ashiekh; 04-13-2018 at 04:50 PM.
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Old 04-12-2018
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Those linear PSU's are very very heavy and expensive. The transformer alone weight more than 4 Kg for a 300w PSU. Craziness.

A SMPSU should not have any problems with transient loads until it's a design or manufacturing flaw. About the recent Seasonic thread, I don't know where might be the problem, perhaps a defective batch with wrong mixed parts or improper set of protections (maybe OCP).
I have a Prime Titanium 850w with dual 1080ti (workstation), a Gold 650W wich I tested it with various graphics cards for the gaming rig (one of them was a Vega64) and I have some friends with various rigs. I have never encountered a problem with transient loads. The only problem was from acoustic point of view.
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Old 04-12-2018
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Quote:
Originally Posted by Al3xand3r View Post
About the recent Seasonic thread, I don't know where might be the problem, perhaps a defective batch with wrong mixed parts or improper set of protections (maybe OCP).
Seasonic PSUs don't have +12V OCP. They use OPP.
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Quote:
Originally Posted by jonnyGURU View Post
Seasonic PSUs don't have +12V OCP. They use OPP.
Right, since are single rail, I forget about that.

But in the reality, the OPP doesn't mean a OCP based on formula P = V x I, whereas the power would be interrupted when the I becomes higher than a certain value?
Or is based on formulas: P = I(square) x R or P = V (square) / R?
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Old 04-13-2018
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Perhaps like a slow blow fuse the response time actually needs slowing down (not speeding up as I first suggested)


Seasonic Prime triggered by sudden power increases
http://www.jonnyguru.com/forums/showthread.php?t=15653
"Seasonic says their PSU is being triggered by sudden power increases and the safety is kicking on"
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Old 04-14-2018
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Slowing down the response time would probably lead to instability/crashes or worse; PSU need to supply power when it's needed not sometimes soon.
In my opinion if protection is the cause of Seasonic problem then it's either improperly set (too sensitive) or the design of the psu is faulty (that it requires the protection to be set as it is).
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