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From: "Phil Allison"
Subject: Re: Doubling wallwart power rating
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Mon, 7 Oct 2002 18:20:51 +1000
NNTP-Posting-Date: Mon, 07 Oct 2002 18:08:56 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
wrote in message
> The 'knee' of the curve of power dissapated vs power delivered is
> quite sharp for a transformer, as once the core saturates, BAD things
> start to happen.
** I have made a bit of a study of wall warts ( plug-packs we call 'em
in Aussie) and find they are almost all operating heavily into saturation.
When you apply the rated load the AC line rms current draw hardly changes
since the load current pulls the saturation current back by the same amount.
> Wall-wart transformers are already run close to the edge.
** Quite true. But temp rise will depend on air flow to some extent. If
you wrap a typical wall wart in a blanket it soon becomes verrry unhappy!!
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