Method of charging a secondary battery and apparatus for the sam

Details Method of charging a secondary battery and apparatus for the sam Method of charging a secondary battery and apparatus for the sam

1998-02-26

2000-07-25

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320139, 320152, H02J 700

Patent

active

060940344

ABSTRACT:
A charging apparatus for charging a secondary battery of the present invention includes a DC/DC converter for outputting a preselected DC voltage and a preselected DC current limited by a voltage setting circuit and a current limiting circuit, respectively. A control circuit senses the voltage of a secondary battery connected to the apparatus and causes the current limiting circuit to set up a first current lying in a constant current range until the battery voltage reaches a full charge voltage. At this instant, the control circuit switches a charge switching circuit in order to apply the first current to the battery in the form of pulses. As soon as the battery voltage reaches the full charge voltage, the control circuit applies a current lower than the current in the constant current range and the current in the constant range to the battery alternately in the form of bilevel pulses. The apparatus is capable of reducing charging time without increasing loads on switching devices, and insures the safety of the battery.

REFERENCES:
patent: 5654622 (1997-08-01), Toya et al.
patent: 5747969 (1998-05-01), Tamai
patent: 5808446 (1997-03-01), Eguchi
patent: 5808447 (1997-02-01), Hagino

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