Author Topic: ATX PSU damaged by transient voltage spike. Advice?  (Read 107 times)

Offline Razerwire

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ATX PSU damaged by transient voltage spike. Advice?
« on: May 02, 2022, 09:07:48 AM »
I have a 500watt Thermaltake purepower atx psu that i have made into a benchtop supply. I was powering my Marx generator through a ZVS circuit, into a DC flyback and into the Marx generator. I've done this many times with no issue however this time would be different... I noticed that the power had suddenly begun jumping the charging resistor on the negative side of the Marx where i had the clips feeding in power. Before I could react and shutdown my power supply did it for me.... and won't restart. My belief is that power having jumped back up into the feedline by bypassing the HV resistor went through the flyback and ZVS and nuked a 12v rail in my psu. I still have 5v standby. Fan twitches when I attempt a start up. I've checked all the sensing shunts to be good, all of the power input side is good and besides one a929a transistor which I replaced everything else looks good. I am asking for advice on where to check next. The voltage monitoring IC seems good but I don't know for sure. There's multiple SMD components on the bottom of the board on the low voltage side that LOOK OK including one 8 pin IC which does who knows what. I need to streamline this troubleshoot and either fix this or buy new with lesson learned. Still, I hate getting so far in and giving up before finding a culprit whether I fixnit or not. Thanks

Offline MRMILSTAR

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Re: ATX PSU damaged by transient voltage spike. Advice?
« Reply #1 on: May 02, 2022, 05:14:24 PM »
I had the same problem with the first-stage charging resistors of my Marx generator. They were occasionally arcing over. I replaced them with higher-voltage-rated resistors. This solved the arcing problem.

I destroyed one SMPS with my Marx generator. Lesson learned. I now use two 12-volt kiddie-car batteries in series. These work great and with my usage will operate the Marx generator for many months before needing to be re-charged. I'm staying with the batteries because it completely removed the risk of HV spikes feeding back into the power supply and possibly the house wiring.

Steve White
Cedar Rapids, Iowa
Retired electrical engineer

High Voltage Forum

Re: ATX PSU damaged by transient voltage spike. Advice?
« Reply #1 on: May 02, 2022, 05:14:24 PM »

 


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