Electric power controlling method through a serial bus

Details Electric power controlling method through a serial bus Electric power controlling method through a serial bus

2006-04-04

2006-04-04

Lee, Thomas (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

C713S330000, C713S340000

Reexamination Certificate

active

07024567

ABSTRACT:
A method of demanding/supplying a necessary electric power through a self-adjusting process between two devices connected by a Universal Serial Bus (USB), removing the requirement of disconnecting and re-connecting cable lines in order to make a power demand again. A power supplying device first determines how much electric power is demanded by a demanding device, then sends the device a signal of impossible supply or the like if the demand can not be met. The supplying device also determines whether or not a new electric power demand can be supplied if the demanding device demands again, and the supplying device then supplies power to the demanding device if the demand can be met. A power demanding device demands an electric power from a supplying device connected through the USB. The connected power demanding device first reduces the demand if a signal of impossible supply or the like is received from the supplying device, then demands the reduced amount from the supplying device.

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Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC, Phillips, “Universal Serial Bus Specification”, Rev. 2.0.

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