Apparatus and method for active balancing of series cells and series packs in a battery system
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United States of America Patent
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Oct 13, 2015
Grant Date -
Jul 25, 2013
app pub date -
Dec 20, 2012
filing date -
Dec 23, 2011
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Abstract
An active balancing and battery charging system for a battery including a plurality of packs made up of cells. An H-bridge circuit having a nominal system voltage as an input generates a square wave output to a plurality of step-down transformers each associated with a pack, where the plurality of step-down transformers provide an active balancing voltage of about the nominal pack voltage. Each pack may include a balancing transformer including a common primary coil receiving the active balancing voltage from the associated step-down transformer or the pack itself. The balancing transformer also includes a plurality of secondary coils each associated with the respective plurality of cells of the pack. A voltage induced in the secondary coils causes a discrete charge current to flow to any cells in the pack that are undercharged relative to other cells.
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