Charging apparatus

Electricity: battery or capacitor charging or discharging – Battery or cell charging – Pulsed

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Details

320133, 320141, 320139, 320162, H02J 700, H02J 714

Patent

active

059231491

ABSTRACT:
A charging apparatus controls the charging of a secondary battery such that charging is performed using a constant current as long as a terminal voltage of the secondary battery is less than a threshold voltage. When the terminal voltage rises to the threshold voltage, charging is performed using a constant voltage that is equal to or less than the threshold voltage. The charging apparatus includes a switch for shutting off the charge current at a predetermined time; a comparator for comparing (1) a voltage difference between an output voltage of a power source at the time of the shut-off of the charge current and a secondary battery voltage with (2) a reference voltage; and control means for (1) switching a charge voltage to a voltage higher than the output voltage of the power source when the charge current is supplied, (2) switching the charge voltage to a voltage equal to the output voltage of the power source when the charge current is shut off, and (3) switching the charge voltage to a voltage equal to the output voltage of the power source when the charging is finished in accordance with the output of the comparator.

REFERENCES:
patent: 5172044 (1992-12-01), Sasaki et al.
patent: 5237259 (1993-08-01), Sanpei
patent: 5408170 (1995-04-01), Umetsu et al.
patent: 5442274 (1995-08-01), Tamai
patent: 5625273 (1997-04-01), Fehling et al.
patent: 5637981 (1997-06-01), Nagai et al.
patent: 5726554 (1998-03-01), Freiman et al.

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