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Inrush current protection for power supplies
Inrush current protection for power supplies
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Old 18th May 2018, 07:25 AM   #11
Gnobuddy is offline Gnobuddy  Canada
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Quote:
Originally Posted by thoglette View Post
At the extremes, some of these required soft-start circuits but mostly it's not an issue for normal wiring and from-the-grid power
It's amazing how far beyond absurdity audiophile products tend to go.

From a little bit of reading I did on the subject of inrush currents, apparently a lot of today's switching power supplies use inrush current protection, because they contain large-value filter caps that are charged up rapidly by rectifying the incoming AC line voltage. There is no transformer in between, so there is negligible series resistance to limit inrush current.

-Gnobuddy
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Old 18th May 2018, 07:46 AM   #12
JMFahey is offline JMFahey  Argentina
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Yes, offline switchers are a different beast.

Math is the same (of course) but diodes straight charge big filter caps, even before the transformer enters the equation, so *there* some kind of soft start is needed.
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Old 18th May 2018, 09:52 AM   #13
trobbins is offline trobbins  Australia
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Quote:
Originally Posted by Gnobuddy View Post
- it was more a case of wondering what sort of long-term damage large inrush transient currents might inflict on filter caps and rectifier diodes.
Diodes can be a concern. Many appreciate that valve diodes definitely require care in selection. And the UF4007 is not as well rated as the 1N4007, although a valve amp would need to be pretty potent to require more. ss amp peak currents are a little harder to define as circuit and part resistances are much lower.

Filter caps are typically only a concern from a ripple current perspective. i've not come across any degradation data relating inrush for common filter caps.
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