Method and circuit for charging battery of portable apparatus

Details Method and circuit for charging battery of portable apparatus Method and circuit for charging battery of portable apparatus

1992-11-09

1994-09-27

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 20, 320 21, 320 39, H02J 710

Patent

active

053509960

ABSTRACT:
A battery-power portable apparatus includes a first constant current source supplies a low current to a battery when the battery voltage is initially lower than a reference level, and when the reference level is reached a second constant current source takes over to supply a high charging current. The battery voltage is constantly monitored to detect a peak voltage and a subsequent voltage drop. When the battery voltage drops a predetermined amount from the peak voltage, the second constant current source is disabled, and the first constant current source is rendered active to charge the battery with a low current on an intermittent mode.

REFERENCES:
patent: 3944904 (1976-03-01), Hase
patent: 3959707 (1976-05-01), Stephens
patent: 4670703 (1987-06-01), Williams
patent: 4888544 (1989-12-01), Terry et al.
patent: 5130634 (1992-07-01), Kasai
patent: 5140251 (1992-08-01), Wu

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