From: Spehro Pefhany <speff@interlog.com>

The renowned Adrian Hodgson <adrian@aphtrading.co.uk> wrote:
> I have found that the chargers transformers are only rated intermittently
> and that they have a thermal cut out on them to cope with over heating that
> happens when running toward there max load.

Good point. And the transformer actually "sees" more RMS amperes than the
DC you get out of it, by perhaps 20-25% depending on ripple voltage etc.

That's because the filter capacitor only draws current from the
transformer in short high current pulses at the tops of the AC waveform,
which heat the transformer windings more than the same *average* current
would (I^2R heating).

Best Regards,
--
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Spehro Pefhany --"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.BlueCollarLinux.com
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