Electricity: battery or capacitor charging or discharging – Battery or cell charging – With thermal condition detection
Reexamination Certificate
2005-10-25
2005-10-25
Tso, Edward H. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With thermal condition detection
Reexamination Certificate
active
06958590
ABSTRACT:
A battery charger circuit is arranged to charge batteries in a constant current mode. A charging current flows from a power device through a sense resistor to a battery. The voltage across the sense resistor is used to measure the charging current. The temperature of the sense resistor changes either because of a change in ambient temperatures or as the result of the charging current creating thermal energy in the sense resistor. The measured charging current from the sense resistor changes because of the temperature coefficient of the sense resistor, creating inaccuracies. A temperature compensation block uses a set of controllable current mirror banks to adjust reference signals such that the effects of the temperature coefficient in the sense resistor are minimized and an accurate charging current measurement is achieved.
REFERENCES:
patent: 5907238 (1999-05-01), Owerko et al.
patent: 6225787 (2001-05-01), Chen et al.
patent: 6271643 (2001-08-01), Becker et al.
Hertzberg Brett A.
Merchant & Gould P,C,
National Semiconductor Corporation
Tso Edward H.
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