Battery charger for charging batteries requiring a constant curr

Details Battery charger for charging batteries requiring a constant curr Battery charger for charging batteries requiring a constant curr

1996-12-05

1998-07-07

Tso, Edward

Electricity: battery or capacitor charging or discharging

Battery or cell charging

H01M 1046

Patent

active

057774579

ABSTRACT:
Disclosed is a battery charger capable of charging a rechargeable battery in accordance with three different types of charge modes. These three charge modes are constant current, constant voltage, and constant current followed by a constant voltage. A microprocessor receives as input signals from a battery indicating the battery type and the battery voltage. The microprocessor automatically outputs control signals which activate certain circuitry depending upon the inputs received from the battery. A regulator outputs a switching voltage that is converted into either a constant current or a constant voltage depending upon the circuitry activated. The circuitry provides feedback to the regulator so that the proper pulse width is output by the regulator depending upon the current or voltage sensed. A voltage comparator compares the terminal voltage of the battery and a divided terminal voltage of the battery to a reference value, and sends the results on to the microprocessor which automatically determines whether or not to complete the recharging process using a constant voltage producing circuit.

REFERENCES:
patent: 4710694 (1987-12-01), Sutphin et al.
patent: 4843299 (1989-06-01), Hutchings
patent: 4876495 (1989-10-01), Palanisamy et al.
patent: 5049804 (1991-09-01), Hutchings
patent: 5168205 (1992-12-01), Kan et al.
patent: 5175485 (1992-12-01), Joo
patent: 5576608 (1996-11-01), Nagai et al.
patent: 5637981 (1997-06-01), Nagai et al.

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