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Power Supply make noises when running on UPS battery

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November 23, 2013 3:25:57 AM

Hello everyone

My UPS brand is ICA CE1200 http://www.icaups.co.id/dproduct.php?id=1502

My Power Supply (Thermaltake 450 Watt) becomes noisier when it is running on the UPS power.

Any thoughts of what could cause this?

Thanksssss
November 23, 2013 4:02:25 AM

Could be the PSU struggling, does the UPS have enough juice?
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November 23, 2013 4:06:37 AM

Yeah, the UPS is fully charged
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November 23, 2013 4:17:37 AM

What's the output of the PSU?
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November 23, 2013 4:22:20 AM

jinksy said:
What's the output of the PSU?


450Watt
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November 23, 2013 7:33:09 AM

and the ups?
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Best solution

a c 289 ) Power supply
November 23, 2013 7:54:10 AM

Often times this is caused by the UPS generating a square wave or a blocky sine wave output instead of something that looks like a true sine wave, it results in a buzzing coming from the PSU, it isn't an uncommon problem. It isn't great for the PSU, but it isn't horrible either unless you are running the PSU on the UPS a lot.

Your UPS makes the red line in the image below, while the PSU was designed to run off the black line, this results in a much bouncier current and voltage pattern than expected which results in a noise that you can hear. It is really difficult to know in advance if a PSU will be noisy or quiet with a stepped sine wave UPS, it isn't something that is tested/designed for, and some units simply cannot deal with it and drop out entirely which is why the pure sine wave UPSs are generally suggested for computers, most other things are fine with running off of even a square wave UPS it is just that a PSU is quite complex and therefore needier when it comes to UPS specs.
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November 23, 2013 8:17:32 AM

hunter315 said:
Often times this is caused by the UPS generating a square wave or a blocky sine wave output instead of something that looks like a true sine wave, it results in a buzzing coming from the PSU, it isn't an uncommon problem. It isn't great for the PSU, but it isn't horrible either unless you are running the PSU on the UPS a lot.

Your UPS makes the red line in the image below, while the PSU was designed to run off the black line, this results in a much bouncier current and voltage pattern than expected which results in a noise that you can hear. It is really difficult to know in advance if a PSU will be noisy or quiet with a stepped sine wave UPS, it isn't something that is tested/designed for, and some units simply cannot deal with it and drop out entirely which is why the pure sine wave UPSs are generally suggested for computers, most other things are fine with running off of even a square wave UPS it is just that a PSU is quite complex and therefore needier when it comes to UPS specs.


Wow, thanks for the clear explanation!!
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