Power unit and charger for a battery powered electrical apparatu

Details Power unit and charger for a battery powered electrical apparatu Power unit and charger for a battery powered electrical apparatu

1996-09-20

1998-09-29

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell charging

320141, H01M 1046

Patent

active

058149732

ABSTRACT:
A unified battery charge method allows for controlling constant as well as time varying current sources. Unlike the charging method used for a constant current source, the input current of a time varying current source must be checked continuously during the charging process. The amount of current output to charge the battery or to supply the phone power is set to a desired value by selecting duty-percentage based upon the input current measurement. A unified formula for different power sources and various required current improves the preferred output current computation. Thus, the unified formula can be used to control input and output currents regardless of whether a constant current source or a time varying current source is used. In order to obtain smoother current average, the method incorporates an adjustable time period, which is determined based on the difference between an input current and a desired output current.

REFERENCES:
patent: 4641078 (1987-02-01), Short
patent: 5523671 (1996-06-01), Stewart
patent: 5530335 (1996-06-01), Decker et al.
patent: 5539298 (1996-07-01), Perkins
patent: 5561361 (1996-10-01), Sengupta et al.
patent: 5600227 (1997-02-01), Smalley
Patent Abstracts of Japan, vol. 012, No. 030 (E-578), 28 Jan. 1988 & JP 62 185559 A (Canon Inc.), 13 Aug. 1987, See Abstract.

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