Battery charging using a transformer with a single primary winding and plural secondary windings
September 28, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCharging system and method for multicell storage batteries Method of equalizing the voltages of the individual cells of storage batteries DC Power system having battery voltage equalizer circuit Battery charging system Motor vehicle electrical system including a combined starter/generator Rapid battery charger, discharger and conditioner Battery charger for charging a plurality of batteries Electric automobile driving apparatus Contactless battery charging system Switch mode battery charging system InventorsAssigneeApplicationNo. 535964 filed on 09/28/1995US Classes:320/119With individual charging of plural batteries or cellsExaminersPrimary: Wong, Peter S.Assistant: Toatley, Gregory J. Jr. Attorney, Agent or FirmForeign Patent References
International ClassH01M 010/44AbstractA simple, low-cost technique for charge equalization of a series connected string of battery cells is provided. The secondary windings of a transformer having a single primary winding and multiple secondary windings are connected across each battery cell to be equalized. A single power converter applies a charging signal to the primary of the transformer, inducing a charging current in each secondary which is inversely related to the charge on the battery cells to be equalized. The transformer is preferably implemented as a coaxial winding transformer having low secondary-to-secondary winding coupling. The power converter is preferably implemented as a forward converter supplied with DC power from an adjustable DC power source. A source voltage provided by the DC source may preferably be adjusted during the course of charge equalization to preferentially direct charge to weaker cells. The charge equalization system may be used in combination with a bulk charging system to provide for both rapid charging of a battery string as well as equalization of the battery cells within the string.Other References
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