Charging circuit with two levels of safety

Details Charging circuit with two levels of safety Charging circuit with two levels of safety

2006-02-14

2006-02-14

Sherry, Michael (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S145000, C320S160000

Reexamination Certificate

active

06998818

ABSTRACT:
A battery charging circuit having two levels of safety protection is provided. The circuit is said to have “two levels” of safety because if any one component fails (either as a short circuit or as an open circuit) the remainder of the charging circuit ensures that a rechargeable battery coupled to the circuit will not be overcharged. The circuit includes both hardware and firmware protection components, with a microprocessor providing the firmware protection. Overvoltage protection, voltage regulation and current regulation are provided, along with a microprocessor capable of sensing a plurality of voltages across the circuit. The overvoltage protection, voltage regulator and current regulator each include safety actuation points. In parallel, the microprocessor may isolate a rechargeable battery from the cell if voltage and current minimums and maximums are exceeded. The microprocessor further is able to isolate the battery from the circuit if the power dissipation in the voltage regulator, the current regulator or the overall charging circuit is exceeded, provided the microprocessor has decremented current to a minimum level.

REFERENCES:
patent: 5982151 (1999-11-01), Nagai et al.
patent: 5998966 (1999-12-01), Gaza
patent: 5998968 (1999-12-01), Pittman et al.
patent: 6037750 (2000-03-01), Von Novak
patent: 6316956 (2001-11-01), Oglesbee
patent: 6674147 (2004-01-01), Sakamoto

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