| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery protective circuit capable of combining overcharge protection and/or overdischarge protection for a plurality of secondary cells used in series connection and each function of a cell balance, and of attaining simplification and small-scale for a circuit configuration. SOLUTION: This battery protection circuit includes a cell balance circuit section 30 for equalizing an electromotive force between the secondary cells by redistributing the electromotive force of a battery 10 in which the plurality of secondary cells (unit cells) B1 to B3 are connected in series to the secondary cells B1 to B3 using a transformer 31 which includes a plurality of secondary windings L21 to L23; a switching circuit 50 which is intervened in a charge and discharge path of the battery 10 in series and controls energization by the current direction; and an overcharge and overdischarge detecting means 40 for detecting which of an overcharge condition or an overdischarge condition exists in the secondary cell of the battery 10. If the overcharge and overdischarge detecting means 40 detects the overcharge, a charging path is shut down. If the overcharge and overdischarge detecting means 40 detects the overdischarge, on the other hand, an overdischarging path is shut down. If the overcharge and overdischarge detecting means 40 detects either the overdischarge or the overcharge, the cell balance circuit section 30 is operated. COPYRIGHT: (C)2004,JPO
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