Title :
Bi-directional power system for laptop computers
Author :
Cleveland, Terry L.
Abstract :
Today the typical laptop computer uses three to five Li-ion battery cells in series for efficient energy storage. For a typical four-cell system, the Li-ion stacked cell voltage ranges from 10.8 V to 16.8 V. This high voltage poses a problem when attempting to step down to the necessary low voltages internal to the laptop. A new "intelligent" power management system is proposed that will enable the ac-dc converter to provide a regulated lower output voltage while still using three or more series Li-ion cells as the main backup power source
Keywords :
AC-DC power convertors; computer power supplies; energy management systems; energy storage; laptop computers; lithium compounds; secondary cells; 10.8 to 16.8 V; Li-ion battery cell; ac-dc converter; backup power source; bidirectional power system; energy storage; intelligent power management system; laptop computer; AC-DC power converters; Batteries; Bidirectional control; Energy management; Energy storage; Intelligent systems; Low voltage; Portable computers; Power system management; Power systems;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2005. APEC 2005. Twentieth Annual IEEE
Conference_Location :
Austin, TX
Print_ISBN :
0-7803-8975-1
DOI :
10.1109/APEC.2005.1452918
