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tech / sci.electronics.design / Re: Does PC power supply store/contain charge even if not used for a night ?

SubjectAuthor
* Re: Does PC power supply store/contain charge even if not used for a night ?John Larkin
`- Re: Does PC power supply store/contain charge even if not used for aFlyguy

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Re: Does PC power supply store/contain charge even if not used for a night ?

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From: jlar...@highland_atwork_technology.com (John Larkin)
Newsgroups: sci.electronics.design
Subject: Re: Does PC power supply store/contain charge even if not used for a night ?
Date: Thu, 01 Sep 2022 15:16:35 -0700
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 by: John Larkin - Thu, 1 Sep 2022 22:16 UTC

On Thu, 1 Sep 2022 14:05:34 -0700 (PDT), Skybuck Flying
<skybuckflying@gmail.com> wrote:

>Say PC user want to clean power supply internally, decides to do it the next morning, so the PC not used for a night. (Power supply is not turned off, and stays plugged into wall socket which is powered).
>
>Would the PC power supply still contain a high/dangerous charge or would it be low charge/power/risk ? :)
>
>Bye,
> Skybuck.

The PFC boost cap can run around 400 volts. I'd expect it to discharge
in a few minutes after the box is unplugged, but you could check it
with a voltmeter.

The 400v is there even if the PC is "turned off" because the supply is
still making standby voltages. It's not really off unless you unplug
it or flip a real switch in the back.

The stored energy could surprise you but is unlikely to be lethal.

Why not unplug it overnight? Or clean it without pawing things.

Re: Does PC power supply store/contain charge even if not used for a night ?

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Subject: Re: Does PC power supply store/contain charge even if not used for a
night ?
From: soar2mor...@yahoo.com (Flyguy)
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 by: Flyguy - Mon, 5 Sep 2022 03:14 UTC

On Thursday, September 1, 2022 at 3:16:46 PM UTC-7, John Larkin wrote:
> On Thu, 1 Sep 2022 14:05:34 -0700 (PDT), Skybuck Flying
> <skybuc...@gmail.com> wrote:
>
> >Say PC user want to clean power supply internally, decides to do it the next morning, so the PC not used for a night. (Power supply is not turned off, and stays plugged into wall socket which is powered).
> >
> >Would the PC power supply still contain a high/dangerous charge or would it be low charge/power/risk ? :)
> >
> >Bye,
> > Skybuck.
> The PFC boost cap can run around 400 volts. I'd expect it to discharge
> in a few minutes after the box is unplugged, but you could check it
> with a voltmeter.
>
> The 400v is there even if the PC is "turned off" because the supply is
> still making standby voltages. It's not really off unless you unplug
> it or flip a real switch in the back.
>
> The stored energy could surprise you but is unlikely to be lethal.
>
> Why not unplug it overnight? Or clean it without pawing things.

Highly unlikely - these circuits are designed for efficiency, not energy storage.

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