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US Patent 6928568 - Battery charger current limiting based on maximum current capacity of AC adapter as determined by adapter identification subsystem

US Patent Issued on August 9, 2005
Estimated Patent Expiration Date: Icon_subject February 15, 2022Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

An information handling system comprising a processor, a battery to provide power to the information handling system, an AC adapter input port coupled to the battery configured to receive an AC adapter, and a battery charger coupled to the battery and the AC adapter input port configured to identify a characteristic of the AC adapter and adjust a battery charge current based upon the characteristic. The battery charger comprises an adapter identification subsystem coupled to the AC adapter input port configured to identify the characteristic and provide an adjustment current, and an adjustable charger coupled to the adapter identification subsystem and the battery, configured to set the battery charging current based upon the adjustment current. The AC adapter identification subsystem comprises an adapter identification circuit coupled to the AC adapter input port configured to identify the characteristic, and a microcontroller configured to provide the adjustment current to the adjustable charger.

Inventors

Application

No. 10077468 filed on 02/15/2002

US Classes:

713/340, Having power source monitoring320/162, With detection of current or voltage amplitude320/106, MEANS TO IDENTIFY CELL OR BATTERY TYPE307/64, Substitute or emergency source320/128, With charging710/301, Card insertion700/22, Electrical power distribution361/679For electronic systems and devices

Field of Search

320/162, With detection of current or voltage amplitude713/340Having power source monitoring

Examiners

Primary: Lee, Thomas C.
Assistant: Wang, Albert

Attorney, Agent or Firm

US Patent References

5162721, Electronic system to discriminate a plurality of power sources
Issued on: 11/10/1992
Inventor: Sato
5532524, Distributed power regulation in a portable computer to optimize heat dissipation and maximize battery run-time for various power modes
Issued on: 07/02/1996
Inventor: Townsley, et al.
5739667, Control system for charging batteries and electronic apparatus using same
Issued on: 04/14/1998
Inventor: Matsuda, et al.
5986437, Power supply system for portable electronic devices
Issued on: 11/16/1999
Inventor: Lee
6035357, IC card compatible with different supply voltages, IC card system comprising the same, and IC for the IC card
Issued on: 03/07/2000
Inventor: Sakaki
6498957, Power supply control in portable data terminal
Issued on: 12/24/2002
Inventor: Umetsu
6795302Method and system to determine external power available and fault states
Issued on: 09/21/2004
Inventor: Kluth, et al.

International Class

G06F001/26

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