Secondary battery charging circuit

Details Secondary battery charging circuit Secondary battery charging circuit

1991-10-15

1995-02-21

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 37, H02J 700

Patent

active

053919742

ABSTRACT:
A secondary battery charging circuit of this invention includes a charging source for supplying a charging current to a secondary battery, a temperature detection unit for generating an output which changes almost linearly with respect to a change in temperature of the secondary battery during a charging operation, a differential unit for obtaining a differential value of an output from the temperature detection unit, a comparator unit for comparing the differential value during the charging operation with a setting value, and for, when the relationship between the two values is reversed, generating an inverted output, a timer circuit unit, started simultaneously with start of the charging operation of the secondary battery, for generating a timer output after an elapse of a predetermined period of time, and a charge control unit for controlling the charging operation of the secondary battery in response to one, generated earlier, of the inverted output from the comparator unit, and the timer output from the timer circuit unit.

REFERENCES:
patent: 3852562 (1974-12-01), Jasinski
patent: 4006397 (1977-02-01), Catotti et al.
patent: 4045720 (1977-08-01), Alexandres
patent: 4052656 (1977-10-01), Lavell et al.
patent: 4065712 (1977-12-01), Godard et al.
patent: 4639655 (1987-01-01), Westhaver et al.
patent: 4670703 (1987-06-01), Williams
patent: 4746852 (1988-05-01), Martin
patent: 4888544 (1989-12-01), Terry et al.

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