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Weird PC PSU Capacity
  • How were you measuring the current in the power cable? Is this with a Kill-o-watt device or perhaps with a clamp meter and a line splitter?

    For the current both with a line-splitter+clamp and checked with an in-line meter. For the power factor, since I don't have any actual instrument to measure It, and I just needed a ball-park figure to discern actual consumption from a capacitor, I used this diy method: https://www.giangrandi.org/electronics/cosphi/cosphi.shtml , which measured 0.04 ( with great approximation ).

    As for why there is a capacitor across the mains input [...]

    I have the basic on how a switching power supply work, but I was asking because it seemed weird to me that commercial appliances didn't take any stand-by meaures to avoid "keeping the wires warm"... is this the norm?

  • Weird PC PSU Capacity

    Bought a new PC, and I was measuring its consumption out of curiosity. I noticed something weird (to me): when the PC is off (in fact, I completely disconnected the PSU and did the same test), there is quite some current running in the power cable to the PSU (0.15A).

    Further measures showed a power factor of (almost) zero, and I can actually measure a capacity of 2uF across the PSU ac input.

    I did the same thing on an older PC I have, and there is no current / capacity. So what would the reason of a capacitor across the mains on the input be in a PSU?

    PS: the PSU is a Thermaltake Toughpower GF A3 1050W

    Edit: I found some official measurements for this specific PSU: https://www.cybenetics.com/evaluations/psus/2249/ that have 40W standby apparent-power by design

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    InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)MA
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