SYSTEM AND METHOD FOR CELL BALANCING AND CHARGING USING A SERIALLY COUPLED INDUCTOR AND CAPACITOR
First Claim
1. An apparatus, comprising:
- transformers each includinga respective primary winding coupled in series with the primary windings of the other transformers, andat least one respective secondary winding each having first and second nodes configured to be coupled across at least one of a set of series-coupled battery cells;
a circuit configured to generate an input current through the primary windings; and
electronic devices each having a first node coupled to one of the first and second nodes of a respective one of the secondary windings and having a second node configured to be coupled to a respective one of the battery cells.
0 Assignments
0 Petitions
Accused Products
Abstract
An apparatus for charging a plurality of series connected battery cells, includes a first and second input terminals for providing a charging voltage to the plurality of series connected battery cell. A transformer includes a primary side associated with the charging voltage and a secondary side includes a plurality of portions. Each of the plurality of portions is connected across at least one of the plurality of series connected battery cell. A switch in series between each of the plurality of portions of the secondary side and the at least one of the plurality of series connected battery cells increases an impedance between the portion of the secondary side and the associated one of the plurality of series connected battery cells in a first state and decreases the impedance between the portion of the secondary side and the associated one of the plurality of series connected battery cells in a second state.
9 Citations
44 Claims
-
1. An apparatus, comprising:
-
transformers each including a respective primary winding coupled in series with the primary windings of the other transformers, and at least one respective secondary winding each having first and second nodes configured to be coupled across at least one of a set of series-coupled battery cells; a circuit configured to generate an input current through the primary windings; and electronic devices each having a first node coupled to one of the first and second nodes of a respective one of the secondary windings and having a second node configured to be coupled to a respective one of the battery cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A system, comprising:
-
a reference node; battery cells coupled in series to the reference node; transformers each including a respective primary winding in series with the primary windings of the other transformers, and at least one respective secondary winding each coupled to a respective one of the battery cells; a circuit configured to generate an input current through the primary windings; and electronic devices each coupled between a respective one of the secondary windings and a respective one of the battery cells. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. A method, comprising:
-
generating an approximately sinusoidal input current through serially coupled primary windings of multiple transformers; and generating, in response to the input current, charge-balancing currents each flowing through a respective secondary winding of the transformers and at least one of a set of serially connected battery cells such that each charge-balancing current has a magnitude that is related to a voltage on the respective at least one of the set of battery cells. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. An apparatus, comprising:
-
an input circuit configured to generate an approximately sinusoidal input current; and transformers including primary windings coupled together in series and configured to receive the input current, and secondary windings each configured to generate, in response to the input current, a respective charge-balancing current flowing through a respective at least one of battery cells that are coupled together in series such that the respective charge-balancing current has a magnitude that is related to a voltage across the respective at least one of the battery cells. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
-
-
41. A system, comprising:
-
a reference node; battery cells coupled in series to the reference node; an input circuit configured to generate an approximately sinusoidal input current; and transformers including primary windings coupled together in series and configured to receive the input current, and secondary windings each configured to generate, in response to the input current, a respective charge-balancing current flowing through a respective at least one of the battery cells such that the respective charge-balancing current has a magnitude that is related to a voltage across the respective at least one of the battery cells. - View Dependent Claims (42, 43, 44)
-
Specification