Electric power conversion systems – Current conversion – Encased in plug housing
Reexamination Certificate
2011-03-22
2011-03-22
Laxton, Gary L (Department: 2838)
Electric power conversion systems
Current conversion
Encased in plug housing
Reexamination Certificate
active
07911817
ABSTRACT:
An AC-DC adapter is provided with an auto-sensing capability to sense when no DC load is present at the output (secondary side) of the adapter by monitoring for absence of load-indicative signals, such as power supply identifier (PSID) signals communicated to the adapter from a coupled DC-powered device. Upon detection of a no load condition, the adapter enters a no load mode during which the adapter output is turned off in order to reduce energy consumption by the adapter, and only produces short recurring voltage pulses (hiccups) at the adapter output. Upon detection of load-indicative signals communicated to the adapter from a coupled DC-powered device, the adapter output enters normal mode and provides its normal regulated power value to the adapter output for powering the coupled DC-powered device.
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Kasprzak Keith J.
Little Daniel B.
Dell Products L.P.
Laxton Gary L
O'Keefe, Egan Peterman & Enders LLP
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