Switched capacitor system for automatic battery equalization

H - Electricity – 02 – J

Patent

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H02J 7/02 (2006.01) H02J 7/00 (2006.01)

Patent

CA 2255970

A switched capacitor system (10) for automatic battery equalization can be used with series coupled batteries (13) as well as primary and backup batteries which are alternately couplable to a load. The system includes a plurality of capacitors (14) and a plurality of switching elements (16). Each of the capacitors is switched back and forth between a predetermined pair of batteries for the purpose of transferring charge therebetween and equalizing the output voltages of each of the batteries in the pair. The capacitors and switching element can be configured in a modular fashion. Multiple modules can be used, for example, in combination with multiple batteries which are series coupled to one another. The system could be used in electric vehicles and in battery backup systems of all types.

Un système de condensateur commuté (10) pour l'égalisation automatique de batteries peut être utilisé avec des batteries couplées en série (B) ainsi que des batteries primaires et de secours qui peuvent être couplées en alternance à une charge. Le système comporte plusieurs condensateurs (14) et plusieurs éléments de commutation (16). Chaque condensateur est basculé en va-et-vient entre une paire prédéterminée de batteries en vue du transfert de charge entre celles-ci et de l'égalisation des tensions de sortie de chaque batterie de la paire. Les condensateurs et l'élément de commutation peuvent être configurés de manière modulaire. De multiples modules peuvent être utilisés, par exemple, combinés à des batteries multiples qui sont couplées en série les unes aux autres. Le système peut être utilisé dans des véhicules électriques et dans des systèmes de batterie de secours de tous types.

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