Power-supply control system for a portable data processor and me

Details Power-supply control system for a portable data processor and me Power-supply control system for a portable data processor and me

1994-04-21

1995-09-12

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

364492, G05F 140

Patent

active

054500036

ABSTRACT:
The present invention discloses a power supply system for a portable data processor and a method for controlling the system. The power supply system includes a main DC/DC converter and an auxiliary DC/DC converter for operating in a low power consumption mode, a suspended mode, and a normal mode. Low voltage cut off circuits are provided to disable the main and auxiliary converters if the main and backup batteries are unable to provide a sufficient voltage level. This system offers increased efficiency and prevents the batteries from being overdischarged. Further, the function of turning power on is performed by the user's operation of a suspend/resume switch, and the function of turning power off may be performed by software to reduce the number of power switches.

REFERENCES:
patent: 4074182 (1978-02-01), Weischedel
patent: 4611289 (1986-09-01), Coppola
patent: 5012406 (1991-04-01), Martin
patent: 5021679 (1991-06-01), Fairbanks et al.
patent: 5230074 (1993-07-01), Canova, Jr. et al.
patent: 5270946 (1993-12-01), Shibasaki et al.
patent: 5300874 (1994-04-01), Shimamoto et al.

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