[Boatanchors] Wall Warts and Switcher Power Supplies

Brian Harris cosmophone at yahoo.com
Tue Nov 27 08:58:50 EST 2012


Yes, they all draw current but the amount varies a great deal from supply to supply.  They draw current because of the circuitry that is required to do the pulse width modulation and other tricks is on all the time.  Most newer technologies use very little idle power.  An examples is here:


http://www.nxp.com/campaigns/greenchip/

Your typical wall wart is just a transformer, bridge rectifier and capacitor.  The leakage current of the transformer is what consumes power when the unit is not powering anything and singly that power is not too much.  Put 3 billion of them on the grid and you have a different case.

 
Brian Harris, WA5UEK
cell 214-763-5977
email cosmophone at yahoo.com


________________________________
 From: David C. Hallam <dhallam at knology.net>
To: Boatanchors at mailman.qth.net 
Sent: Tuesday, November 27, 2012 6:59 AM
Subject: [Boatanchors] Wall Warts and Switcher Power Supplies
 
Do switcher PS continue to draw current whether or not they are in use as do wall warts?

David
KC4DH

-- A democratic government is the only one in which those who vote for a tax can escape the obligation to pay it.
Alexis de Tocqueville

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