Systems and methods for balancing battery cells
First Claim
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1. A system comprising:
- a transformer circuit that includes a primary winding and a plurality of secondary windings coupled to a battery pack having a plurality of cells, and that is operable for transforming an input power of said system into a plurality of output currents from said secondary windings to said cells, wherein an input current through said primary winding corresponds to said input power; and
a control circuit, coupled to said transformer circuit, that is operable for controlling a level of said input current to increase if a voltage of said battery pack increases, and operable for controlling a level of said input current to decrease if said voltage of said battery pack decreases, so as to maintain a summation of said output currents at a predetermined value.
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Abstract
In a power converter, a primary winding receives an input power. In addition, multiple secondary windings transform the input power into multiple charging currents to charge a set of cells via a set of paths. The multiple secondary windings further balance the set of cells based on the charging currents. A ratio between a first turn number of a first secondary winding of the secondary windings and a second turn number of a second secondary winding of the secondary windings is determined by a nominal voltage ratio between two corresponding cells of the set of cells.
20 Citations
20 Claims
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1. A system comprising:
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a transformer circuit that includes a primary winding and a plurality of secondary windings coupled to a battery pack having a plurality of cells, and that is operable for transforming an input power of said system into a plurality of output currents from said secondary windings to said cells, wherein an input current through said primary winding corresponds to said input power; and a control circuit, coupled to said transformer circuit, that is operable for controlling a level of said input current to increase if a voltage of said battery pack increases, and operable for controlling a level of said input current to decrease if said voltage of said battery pack decreases, so as to maintain a summation of said output currents at a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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receiving an input current at a primary winding of a transformer circuit, said input current corresponding to an input power; transforming said input power into a plurality of output currents from a plurality of secondary windings of said transformer circuit; and controlling said input current based on a voltage of said battery pack to maintain a summation of said output currents at a predetermined value, wherein a level of said input current is controlled to increase if said voltage of said battery pack increases, and said level of said input current is controlled to decrease if said voltage of said battery pack decreases. - View Dependent Claims (11, 12, 13)
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14. A system comprising:
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a battery pack comprising a plurality of cells; a transformer circuit, coupled to said battery pack, comprising a primary winding configured to receive an input power of said system to generate an input current flowing through said primary winding, and comprising a plurality of secondary windings configured to transform said input power into a plurality of output currents and charge said plurality of cells, respectively; and a control circuit, coupled to said transformer circuit, that is operable for controlling a level of said input current to increase if a voltage of said battery pack increases, and operable for controlling a level of said input current to decrease if said voltage of said battery pack decreases, so as to maintain a summation of said output currents at a predetermined value. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification