Multi-cell battery pack charge balancing circuit

Details Multi-cell battery pack charge balancing circuit Multi-cell battery pack charge balancing circuit

1999-07-26

2000-09-05

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

H02J 700

Patent

active

061148350

ABSTRACT:
A charge balancing circuit incorporates a voltage threshold which determines when to initiate a charge balance mode in order to equalize the level of charge in at least two cells of a multi-cell battery pack. Charge balancing is initiated when the voltage level of a first cell reaches this second threshold. Charge balancing then continues by modifying the charges of the first balance cell and a second reference lesser charged cell until the voltage levels of the first and second cells are equal. A subsequent charge cycle will result in the cell with the greatest charge being balanced with another of lesser charge. In this manner, all of the cells of a multi-cell battery pack are charge balanced over the course of plural charge cycles.

REFERENCES:
patent: 4053824 (1977-10-01), Dupuis et al.
patent: 5578914 (1996-11-01), Morita
patent: 6043628 (2000-01-01), Perelle et al.

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