Battery charger status monitor circuit and method therefor

Details Battery charger status monitor circuit and method therefor Battery charger status monitor circuit and method therefor

1993-12-03

1994-12-27

Peckman, Kristine L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 44, H02J 704

Patent

active

053768752

ABSTRACT:
A battery charger status monitor circuit (40) for monitoring the status of a battery (12) charged with current pulses. The current pulses charging the battery (12) are reduced in frequency and duty cycle as the battery approaches a fully charged condition. By monitoring the number of current pulses charging the battery within a predetermined time period, the charge status of the battery (12) is determined. If no pulses are detected within the predetermined time period, the battery (12) is fully charged. A counter (47) is incremented by a clock signal. A charge signal resets the counter (47). The charge signal corresponds to the current pulses charging the battery. If the counter (47) reaches a predetermined count, the clock and charge signals are disabled. Reaching the predetermined count before resetting indicates the battery (12) is fully charged. When the counter is below the predetermined count, the battery (12) is being charged.

REFERENCES:
patent: 3944904 (1976-03-01), Hase
patent: 4016473 (1977-04-01), Newman
patent: 4237411 (1980-12-01), Kothe et al.
patent: 4554500 (1985-11-01), Sokira
patent: 4679000 (1987-07-01), Clark
patent: 4912392 (1990-03-01), Faulkner
patent: 5248928 (1993-09-01), Gilmore

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