Circuit and method for battery charge control
March 11, 2017. 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 ReferencesSatellite battery reconditioning system and method Multi-cell battery protection system System and method for charging electrochemical cells in series Method of equalizing the voltages of the individual cells of storage batteries Arrangement and method for operating an electrochemical storage device Lithium battery protection circuit Capacitive power supply having charge equalization circuit Cell monitor and control unit for multicell battery Temperature compensated lithium battery energy monitor Conditioning and charging circuit for nickel-cadmium batteries InventorsAssigneeApplicationNo. 814684 filed on 03/11/1997US Classes:320/119, With individual charging of plural batteries or cells320/116, SERIALLY CONNECTED BATTERIES OR CELLS320/118With discharge of cells or batteriesExaminersPrimary: Wong, Peter S.Assistant: Shin, K. Attorney, Agent or FirmForeign Patent References
International ClassH02J 007/00AbstractA battery charge control circuit (10) senses the charge condition of cells in a battery pack (12, 14, 16, 18) using a measurement circuit (51). Upon detection of a single under-voltage cell, the charge control circuit is placed in a sleep mode. Pack sense circuit (240) senses when the battery pack is placed in a charger. If circuit (10) was in a sleep mode, it is awakened. If any cell is measured over-voltage, the status is checked versus the other cells. If all the cells are over-voltage, the battery is considered balanced. If one or more cells are not over-voltage, a control circuit (32) activates a discharge transistor (212, 214, 216, 218), discharging the cell within a hysteresis voltage below the over-voltage limit. Charge balancing of cells is continued until the cells are within a programmable hysteresis voltage of each other.Field of SearchCycling (e.g., discharge/charge cycle, etc.)With discharge of cells or batteries With individual charging of plural batteries or cells Having variable number of cells or batteries in series Switchable cells (e.g., for voltage regulation, etc.) Bypassable battery cell SERIALLY CONNECTED BATTERIES OR CELLS | |
