4 ms·

I wonder how easy this would make server local UPS systems. A battery with a single buck/boost converter should be enough as a power supply. Just need to add a

I wonder how easy this would make server local UPS systems. A battery with a single buck/boost converter should be enough as a power supply. Just need to add a mains fed charge circuit.

mmastrac 7y ago
Probably would allow very cheap power supplies w/built-in UPSes. 12V±5% voltage is the allowed range.
- baybal2 7y ago
  ±5% would not be that easy with current spikes from CPU and GPU. It's 300W-400W load going to near zero and back within microseconds.
  - chmod775 7y ago
    It's not black magic to handle that with a capacitor or two.
    - baybal2 7y ago
      It is, first the cap needs to ve huve enough, second ESR will need to be very, very low unless you want to cool the cap as well
- michaelt 7y ago
  Most desktop users would probably prefer a UPS that also ensured their monitor stayed on.
  - loeg 7y ago
    I actually leave my monitor off UPS intentionally. While I'm away, I'd rather my workstation survive a brownout or short loss of power and if I'm actively working, it's easy enough to move the monitor's power cable to the UPS to save my work and shut down. My CPU draws ~45W at idle; my monitor draws a whopping 130W — having it on battery materially shortens the off-AC runtime.
    - Marsymars 7y ago
      Your monitor shouldn't draw 130W at idle. My 34" monitor is ~3W in sleep mode, 34W when on. Even my eight year old 55" TV only draws 90W when on.
      - wtallis 7y ago
        Older high-end monitors with CCFL backlights could easily draw 130W. Dell's 30-inch model from 2008 was rated for typical draw of 163W and a max of 250W (when also powering speakers and USB devices).
        loeg 7y ago
        Indeed, this is a HP 30" from 2010.
      - loeg 7y ago
        It's a 10 year old TFT: https://support.hp.com/us-en/document/c02159509 https://support.hp.com/us-en/document/c02159509 "Typical power consumption: 130 W."
        ComputerGuru 7y ago
        Right, but doesn’t it suspend when you’re away? DPMS should be at least an order of magnitude less, if not two.
        loeg 7y ago
        Nope. I turn it off when I'll be away for a long time. But not if I'm just grabbing food or doing some housework or whatever.
  - dannyw 7y ago
    If your goal is to game or work during a power outage, sure. If your goal is just to protect your data from sudden termination, then having a PSU with a built in UPS is quite nice.
    - NoSorryCannot 7y ago
      Being able to power any external device (like a hard drive) or to be able to cleanly exit from whatever you're working on if you happen to be present (with a monitor) are both pursuant to these goals. The average PC or workstation isn't configured for a clean exit just because the UPS said it's time. Bridging momentary outages is also useful where that's common, disregarding data loss.
      - unilynx 7y ago
        They ought to be able to exit cleanly in time... that's what hibernation is for.
        numpad0 7y ago
        What they are saying is that in the case with their setup they can't trigger shutdown or hibernation without a backed up KVM.
  - m463 7y ago
    why not put the 12v power supply inside the monitor?
ars 7y ago
It would be awesome if they speced an external 12V connector on the power supply that just goes to a battery - no electronics. Then every power supply could be its own UPS, and handle charging the battery. It would need to be a pretty fat wire, but that's handleable.

I wonder how easy this would make server local UPS systems. A battery with a single buck/boost converter should be enough as a power supply. Just need to add a mains fed charge circuit.

mmastrac 7y ago

Probably would allow very cheap power supplies w/built-in UPSes. 12V±5% voltage is the allowed range.

baybal2 7y ago
±5% would not be that easy with current spikes from CPU and GPU. It's 300W-400W load going to near zero and back within microseconds.
- chmod775 7y ago
  It's not black magic to handle that with a capacitor or two.
  - baybal2 7y ago
    It is, first the cap needs to ve huve enough, second ESR will need to be very, very low unless you want to cool the cap as well
michaelt 7y ago
Most desktop users would probably prefer a UPS that also ensured their monitor stayed on.
- loeg 7y ago
  I actually leave my monitor off UPS intentionally. While I'm away, I'd rather my workstation survive a brownout or short loss of power and if I'm actively working, it's easy enough to move the monitor's power cable to the UPS to save my work and shut down. My CPU draws ~45W at idle; my monitor draws a whopping 130W — having it on battery materially shortens the off-AC runtime.
  - Marsymars 7y ago
    Your monitor shouldn't draw 130W at idle. My 34" monitor is ~3W in sleep mode, 34W when on. Even my eight year old 55" TV only draws 90W when on.
    - wtallis 7y ago
      Older high-end monitors with CCFL backlights could easily draw 130W. Dell's 30-inch model from 2008 was rated for typical draw of 163W and a max of 250W (when also powering speakers and USB devices).
      - loeg 7y ago
        Indeed, this is a HP 30" from 2010.
    - loeg 7y ago
      It's a 10 year old TFT: https://support.hp.com/us-en/document/c02159509 https://support.hp.com/us-en/document/c02159509 "Typical power consumption: 130 W."
      - ComputerGuru 7y ago
        Right, but doesn’t it suspend when you’re away? DPMS should be at least an order of magnitude less, if not two.
        loeg 7y ago
        Nope. I turn it off when I'll be away for a long time. But not if I'm just grabbing food or doing some housework or whatever.
- dannyw 7y ago
  If your goal is to game or work during a power outage, sure. If your goal is just to protect your data from sudden termination, then having a PSU with a built in UPS is quite nice.
  - NoSorryCannot 7y ago
    Being able to power any external device (like a hard drive) or to be able to cleanly exit from whatever you're working on if you happen to be present (with a monitor) are both pursuant to these goals. The average PC or workstation isn't configured for a clean exit just because the UPS said it's time. Bridging momentary outages is also useful where that's common, disregarding data loss.
    - unilynx 7y ago
      They ought to be able to exit cleanly in time... that's what hibernation is for.
      - numpad0 7y ago
        What they are saying is that in the case with their setup they can't trigger shutdown or hibernation without a backed up KVM.
- m463 7y ago
  why not put the 12v power supply inside the monitor?

ars 7y ago

It would be awesome if they speced an external 12V connector on the power supply that just goes to a battery - no electronics. Then every power supply could be its own UPS, and handle charging the battery. It would need to be a pretty fat wire, but that's handleable.