Bidirectional current pump for battery charge balancing
Patent 5631534 Issued on May 20, 1997. Estimated Expiration Date: 
August 21, 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.
August 21, 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 ReferencesDevice for balancing parallel strings Current balancing for battery strings Multiple voltage battery charge balancing and load protecting device Battery equalization circuit for a dual voltage charging system Battery monitoring, charging and balancing apparatus Patent #: 5498950 InventorAssigneeApplicationNo. 517886 filed on 08/21/1995US Classes:320/103, ONE CELL OR BATTERY CHARGES ANOTHER320/118, With discharge of cells or batteries320/119With individual charging of plural batteries or cellsExaminersPrimary: Tso, Edward H.Attorney, Agent or FirmInternational ClassH01M 010/46AbstractA battery balancing system for balancing charge among series connected batteries. The battery balancing system includes a series connected battery array having a predetermined number of series connected batteries. A predetermined number of bidirectional charge balancing modules are provided and each respective module is coupled across two consecutive batteries. A controller is connected to each of the batteries for sensing the state of charge of each of the batteries and for providing control output signals that turn on and off and control the current direction flow of the modules to balance charge among batteries. Each module includes first and second series connected switches coupled across two consecutive batteries. Each of the series connected switches have control inputs connected to control outputs of the controller. First and second diodes are respectively coupled across the first and second series connected switches. An inductor is coupled from a point between the first and second series connected switches and a point between the batteries. | |
