Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – Having variable number of cells or batteries in series
Patent
1997-05-14
1999-08-03
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
Having variable number of cells or batteries in series
H01M 1046
Patent
active
059329904
ABSTRACT:
A charging control system for use with a battery charger for charging a battery array which is constituted by battery cells includes charging control units corresponding individually to the battery cells. Each unit includes a voltage-regulator circuit for generating a reference voltage corresponding to the fully charged voltage of the battery cell and a comparator for comparing the inter-electrode voltage of the battery cell with the reference voltage. When the inter-electrode voltage has reached the fully charged voltage, the comparator cooperates with an amplifier to turn ON a field-effect transistor of a bypass circuit of the unit, to thereby divert the charging current from to the battery cell to the bypass circuit. The amplifier receives a feedback voltage indicating the bypass current and operates to keep the bypass current constant, thereby preventing overcharging of the battery cell.
REFERENCES:
patent: 4614905 (1986-09-01), Petersson et al.
patent: 5469042 (1995-11-01), Ruhling
patent: 5523668 (1996-06-01), Feldstein
patent: 5578914 (1996-11-01), Morita
patent: 5617004 (1997-04-01), Kaneko
patent: 5644209 (1997-07-01), Chabbert et al.
Intergran, Inc.
Japan Tobacco Inc.
Tso Edward H.
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