Battery charger for charging both a frequently and infrequently

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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320 20, H02J 704

Patent

active

053509951

ABSTRACT:
A battery charger used to charge a battery has a voltage detector for detecting a voltage across a battery, a memory for storing detected voltage values, and a comparator for comparing a presently detected voltage with a previously stored voltage. If the detected voltage decreases below a certain value before a predetermined period of time elapses, it is determined that a battery that has been in storage for a long period of time is connected to the battery charger. The battery charger will then apply a constant current to the battery until a second predetermined period of time has elapsed.

REFERENCES:
patent: 4114176 (1978-09-01), Kawasaki
patent: 4354148 (1982-10-01), Tada et al.
patent: 4843299 (1989-06-01), Hutchings
patent: 4920307 (1990-04-01), Iketani
patent: 5180961 (1993-01-01), Tsujino
patent: 5206579 (1993-04-01), Kawate et al.
patent: 5229705 (1993-07-01), Kato
CQ Shuppan K.K., "Transistor Technology Supplement Hardware Design Series", pp. 130-135, published Jun. 1, 1992 and English language translation.

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