CHARGE EQUALIZATION APPARATUS WITH PARALLEL CONNECTION OF PRIMARY WINDINGS OF MULTIPLE TRANSFORMERS
First Claim
1. A charge equalization apparatus, comprising:
- N transformers, each having a primary winding and a secondary winding wound around the transformer, the primary windings of the transformers being connected in parallel with each other, the secondary windings of the transformers being connected in parallel with battery cells;
N first current transfer devices connected in series with the secondary windings of the N transformers, respectively;
N battery cells connected in series with each other, and connected in parallel with the secondary windings of the N transformers, the battery cells being constructed so that a first end of the N series-connected battery cells is connected to first ends of the parallel-connected primary windings of the N transformers;
a first switch connected to the first ends of the parallel-connected primary windings of the N transformers, thus controlling flow of current of the primary windings in a first direction or a second direction; and
a voltage sensing and switch drive signal generation unit for sensing voltages of the N battery cells and turning on/off the first switch,wherein the charge equalization apparatus is operated such that, when the first switch is turned on, current flows through the primary windings in the first direction, and current is induced in the secondary windings, thus enabling equalized charge to be distributed to the N battery cells.
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Accused Products
Abstract
The present invention relates, in general, to a charge equalization apparatus for batteries and, more particularly, to a charge equalization apparatus, in which the primary windings (M11 to M1N) of a number of transformers (T1 to TN) corresponding to the number of battery cells are connected in parallel with each other, a switch (S) for controlling the flow of current of the primary windings (M11 to M1N) of the parallel-connected transformers is connected in series with the parallel-connected primary windings, respective secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with the battery cells, and the battery cells are connected in series with each other.
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Citations
9 Claims
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1. A charge equalization apparatus, comprising:
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N transformers, each having a primary winding and a secondary winding wound around the transformer, the primary windings of the transformers being connected in parallel with each other, the secondary windings of the transformers being connected in parallel with battery cells; N first current transfer devices connected in series with the secondary windings of the N transformers, respectively; N battery cells connected in series with each other, and connected in parallel with the secondary windings of the N transformers, the battery cells being constructed so that a first end of the N series-connected battery cells is connected to first ends of the parallel-connected primary windings of the N transformers; a first switch connected to the first ends of the parallel-connected primary windings of the N transformers, thus controlling flow of current of the primary windings in a first direction or a second direction; and a voltage sensing and switch drive signal generation unit for sensing voltages of the N battery cells and turning on/off the first switch, wherein the charge equalization apparatus is operated such that, when the first switch is turned on, current flows through the primary windings in the first direction, and current is induced in the secondary windings, thus enabling equalized charge to be distributed to the N battery cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification