Importance

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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.

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First Claim