Power Supply make noises when running on UPS battery

Jayvdiyk2 · Nov 23, 2013

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

jinksy · Nov 23, 2013

Could be the PSU struggling, does the UPS have enough juice?

Jayvdiyk2 · Nov 23, 2013

Yeah, the UPS is fully charged

jinksy · Nov 23, 2013

What's the output of the PSU?

Jayvdiyk2 · Nov 23, 2013

jinksy :

450Watt

jinksy · Nov 23, 2013

and the ups?

hunter315 · Nov 23, 2013

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.

Jayvdiyk2 · Nov 23, 2013

hunter315 :

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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Power Supply make noises when running on UPS battery

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