TITLE

Minimize your notebook's ac adapter power rating and battery-charging time

AUTHOR(S)
Jinrong Qian
PUB. DATE
July 2004
SOURCE
Portable Design;Jul2004, Vol. 10 Issue 7, p20
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
The electric current drawn by a notebook computer from an AC adapter or lithium-ion battery is pulsating due to the processor's aggressive power management modes, which transitions the CPU from sleep to active mode and vice versa. The resultant problem is that the AC adapter must be designed for the worst case of maximum system power plus the power for charging the battery unless there is active power control of the CPU and charger. The optimal architecture must minimize the adapter power while at the same time minimize the battery-charging time. A viable solution is to reduce battery charge current when a predetermined adapter current limit is reached. This method avoids overloading the adapter when supplying the load and the charger simultaneously.
ACCESSION #
13854661

 

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