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From: "Tom Faloon"
Newsgroups: sci.electronics.design
Subject: Re: Doubling wallwart power rating
Date: Sun, 6 Oct 2002 20:19:58 +0100
Message-ID:
References:
NNTP-Posting-Host: tfaloon.demon.co.uk
NNTP-Posting-Date: Sun, 6 Oct 2002 20:53:42 +0000 (UTC)
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Increasing ventilation won't permit a appreciable increase in output power.
(Maybe a few % at a rough guess) Find data sheets for typical components,
and look at the derating curves provided by the manufacturer.
My advice is - don't drill holes in the plastic case of a wall wart, because
it provides a safety barrier to prevent users from coming in contact with
dangerous voltages - typically 120 V or 230V depending on where you live.
Adding vent holes allows provides the possibility of users touching these
high potentials, due to conductors entering the case.
Tom Faloon
http://www.faloon.co.uk
N. Thornton wrote in message
news:a7076635.0210051158.84ddc10@posting.google.com...
> Wall warts come in plastic cases, which must be very poor heat
> dissipators. If vent holes are added top and bottom, I wonder what
> sort of power out increase one could get.
> More TF cooling = more i flow acceptable.
> More diode cooling = more i flow acceptable also.
>
> Anyone have an idea what sort of gains we might be looking at?
>
> Regards, NT
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