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How to diagnose Antec PSU safety shutdowns.

post #1 of 2
Thread Starter 
Hello, I made a thread in another section (LINK) about my computer intermittent crashing issue.

After reading antec's spec sheet for my power supply I wondered if the reason my computer keeps randomly restarting is because of their safety protections.

What exactly happens when a PSU runs one of those fail-safe protections?

-Over Voltage Protection (OVP)
-Short Circuit Protection (SCP)
-Under Voltage Protection UVP)
-Over Current Protection (OCP)

Could that explain why my computer momentenaously powers-out then boot again by itself 3 second later?
post #2 of 2
Those protections are normally implemented via a protections chip, such as the popular PS223. When that chip detects an out of spec parameter, it sends a signal to the PSU's PFC/PWM control chip(s). Those chips usually have an "EN" (enable, or on/off) pin. When that pin receives a signal, it initiates a shut-down procedure to gracefully turn-off the PSU within a certain number of switching cycles, usually taking just a few milliseconds.



Anyway, issues like yours are always the motherboard. I've encountered this dozens of time, and every time the PSU checks out fine, and it turns out to be a motherboard fault.
Edited by CM Phaedrus - 11/22/13 at 11:05am
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