Charging apparatus

Details Charging apparatus Charging apparatus

1993-06-29

1994-04-12

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 20, 320 21, H02J 704

Patent

active

053028872

ABSTRACT:
A charging apparatus includes a microcomputer which turns a transistor on so as to supply a charging current from a constant current source to a battery pack incorporating a secondary battery. The microcomputer counts a time required for increasing a battery voltage of the secondary battery, which is outputted from an A/D converter, by a predetermined value, and predicts a time during when the battery voltage will be subsequently increased by the predetermined value. If the battery voltage is not increased by the predetermined value within a predicted time, the microcomputer determines that the battery voltage reaches a peak value thereof and turns the transistor off to terminate a charge. The charging apparatus is suitable for a rapid charge of Ni-MH batteries.

REFERENCES:
patent: 3794905 (1974-02-01), Long
patent: 4213081 (1980-07-01), Taylor
patent: 4354148 (1982-10-01), Tada et al.
patent: 4387332 (1983-06-01), Oyamada et al.
patent: 4388582 (1983-06-01), Saar et al.
patent: 4418310 (1983-11-01), Bollinger
patent: 4668901 (1987-05-01), Furukawa
patent: 4742290 (1988-05-01), Sutphin et al.
patent: 4849682 (1989-07-01), Bauer et al.
patent: 4855663 (1989-07-01), Matsui et al.
Matsumoto et al., Sanyo Technical Review, 23, 118-125 (1991).

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