switchmode AC adapters

From: Jamie Morken (truespace1_at_hotmail.com)
Date: 06/07/04 

Date: Mon, 07 Jun 2004 21:57:29 GMT

Hi all,

The newer AC adapters for printers/laptops etc seem to be a lot lighter and
higher power output than older AC adapters. Is this due to them being
switching powersupplies instead of 60Hz stepdown transformer based? Also to
make a switchmode 120VAC to ~12VDC isolated power supply requires quite a
few components: input diodes, mosfet half-bridge, HF transformer, output
diodes, and the control circuitry. Do the switchmode AC adapters implement
this type of design or are they using a simpler/different design?

cheers,
Jamie Morken

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