SYSTEMS AND METHODS FOR BALANCING MULTI-CELL BATTERIES
First Claim
1. A battery balancing circuit comprising:
- a battery comprising a plurality of cells coupled in series, a first terminal and a second terminal;
a transformer comprising a primary winding and a plurality of secondary windings, wherein each secondary winding is coupled to one of the plurality of cells via a secondary switch and a rectifier circuit, wherein the primary winding is coupled between the first terminal and the second terminal of the battery;
a primary switch in series with the primary winding of the transformer; and
a control circuitry coupled to the primary switch, the plurality of secondary switches, and each of the plurality of cells.
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Abstract
Systems and methods for balancing multi-cell batteries are provided. In one embodiment, the battery balancing circuit includes a battery including a plurality of cells coupled in series, a first terminal and a second terminal, a transformer including a primary winding and a plurality of secondary windings, where each secondary winding is coupled to one of the plurality of cells via a secondary switch and a rectifier circuit, where the primary winding is coupled between the first terminal and the second terminal of the battery, a primary switch in series with the primary winding of the transformer, and a control circuitry coupled to the primary switch, the plurality of secondary switches, and each of the plurality of cells.
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Citations
22 Claims
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1. A battery balancing circuit comprising:
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a battery comprising a plurality of cells coupled in series, a first terminal and a second terminal; a transformer comprising a primary winding and a plurality of secondary windings, wherein each secondary winding is coupled to one of the plurality of cells via a secondary switch and a rectifier circuit, wherein the primary winding is coupled between the first terminal and the second terminal of the battery; a primary switch in series with the primary winding of the transformer; and a control circuitry coupled to the primary switch, the plurality of secondary switches, and each of the plurality of cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A battery balancing circuit comprising:
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a battery comprising a plurality of cells coupled in series, a first terminal and a second terminal; a transformer comprising a primary winding and a plurality of secondary windings, wherein each secondary winding is coupled to one of the plurality of cells via a secondary switch and a rectifier circuit, wherein a center-tap terminal of the primary winding is coupled to the first terminal of the battery; a first primary switch coupled in series between a first terminal of the primary winding and the second terminal of the battery; a second primary switch coupled in series between a second terminal of the primary winding and the second terminal of the battery; and a control circuitry coupled to the first primary switch, the second primary switch, the plurality of secondary switches, and each of the plurality of cells. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for balancing energy stored in a plurality of cells of a battery having a first terminal and a second terminal, the method comprising:
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detecting an imbalance condition in one of the plurality of cells of the battery; actuating, repeatedly, a primary switch coupled between the first terminal of the battery and a transformer comprising a primary winding and a plurality of secondary windings, wherein each secondary winding is coupled to one of the plurality of cells via a secondary switch and a rectifier circuit, wherein the primary winding is coupled between the first terminal and the second terminal of the battery; and actuating the secondary switch corresponding to the one of the plurality of battery cells having the imbalance condition.
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Specification