USB port with smart power management

Details USB port with smart power management USB port with smart power management

2008-02-13

2011-12-27

Williams, Arun (Department: 2858)

Electricity: battery or capacitor charging or discharging

One cell or battery charges another

C323S901000, C710S303000, C439S668000

Reexamination Certificate

active

08084987

ABSTRACT:
A method involves detecting an inrush current that flows out of a USB port of a first electronic device when a central processing unit (CPU) of the first electronic device is not being powered. The inrush current is detected by a novel inrush current detect circuit when a second electronic device is connected to the USB port. In one example, the first electronic device is a laptop computer having a battery and a USB DC-to-DC converter. The inrush current detect circuit enables the USB DC-to-DC converter such that the USB DC-to-DC converter receives power from the battery and supplies a regulated voltage to the second electronic device through the USB port while the CPU remains unpowered (not drawing power from the battery).

REFERENCES:
patent: 2004/0164708 (2004-08-01), Veselic et al.
patent: 2005/0144495 (2005-06-01), Nakajima et al.
patent: 2006/0035527 (2006-02-01), Numano
patent: 2008/0129270 (2008-06-01), Kawk et al.

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