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seraphimsystems
6y

Question for the electrically minded.

I have a laptop with a 19v input.

I have a portable UPC with 2 voltage options in the range of this, I can undervolt at 16v (the laptop battery voltage) which works with a small firmware correction to ignore a board sensor, the other option is to slightly overvolt to 19.5v which I assume the laptop could handle through its input regulation.

Can anyone confirm if a .5v variance at charger is within tolerance? It would be an overvolt of 2.5%

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  • 2
    6y
    Why not use a small power regulator? IMHO even giving 5.2 volts to something that wants 5 is enough to fry it.

    You can downscale from 19.5 to 19 rather easy
  • 1
    6y
    Nobody sane will give you a guarantee, but I'd say it's probably fine. Personally, I would put a diode in series to be safe.
  • 0
    6y
    @donnico @7400 yeah I'm hoping there's a regulator built into the laptop, I don't want to add anything really as it's portable and enclosed, as the total watts would be lower at 19.5v through this supply than the designed charger at 19v due to max current limitations (60w Vs 45w) any additional heat generated by the regulator should ensure able to dissipate.
  • 0
    6y
    @seraphimsystems There is a regulator. The question only is whether its design is so cost-optimised a minimal increase in input voltage will impact its lifetime.
  • 0
    6y
    @7400 ah... Now that's something I can work with... It's a HP pro-grade lappie so I'm gonna assume it can until it doesn't... Then replace it if it pops under insurance.
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