Electricity: battery or capacitor charging or discharging – Battery or cell discharging – Regulated discharging
Reexamination Certificate
2011-03-01
2011-03-01
Vu, Bao Q (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
Regulated discharging
C320S137000
Reexamination Certificate
active
07898220
ABSTRACT:
A rapid charging circuit for a lithium ion battery. The battery charger in accordance with the present invention compensates for the voltage drops across the various resistance elements in the battery circuit by setting the charging voltage to a level to compensate for the initial resistance of the series resistances in the circuit and an additional resistance selected to take into account the anticipated increase in resistance of the various circuit elements over time. The battery charger in accordance with the present invention periodically monitors the open-circuit voltage of the battery cell and reduces the charging voltage to when the battery cell voltage reaches the optimal value. Thus, during a constant current charging mode, the battery cell is driven at a relatively optimal charging current to reduce the charging time. As such, the system is able to optimize the charging current supplied to a battery cell during a constant current mode of operation while compensating for circuit elements whose resistance may vary over time due to temperature or other factors, such as corrosion, while at the same time avoiding exceeding the maximum recommended voltage for the battery cell.
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Fairchild Semiconductor Corp., Application Note AN4105, “Design Considerations for Switched Mode Power Supplies Using a Fairchild Power Switch (FPS) in a Flyback Converter:” www.fairchildsemi.com, DATE: 2002.
Guang Huang Tai
Hua Li Wen
Jie Xia Ju
Wentink Robert F.
ICC-Nexergy, Inc.
Katten Muchin & Rosenman LLP
Paniaguas John S.
Tran Nguyen
Vu Bao Q
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