Automatic electric battery charging apparatus

Details Automatic electric battery charging apparatus Automatic electric battery charging apparatus

1977-10-05

1980-03-04

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 37, 320 39, H02J 704

Patent

active

041919181

ABSTRACT:
An automatic electric battery charger which detects when the battery is fully charged by monitoring the rate of rise of battery voltage; when the rate of rise falls below a predetermined value, the charge is terminated. The rate of rise of voltage is detected by comparing an unprocessed battery voltage signal with a signal which follows the battery voltage signal with an exponential lag having a time constant of about 45 minutes. With a low rate of rise of voltage, such as occurs when the battery approaches the fully charged state, the lagging signal will tend to catch up with the unprocessed signal, and when the difference falls below 11 mV per cell, the charged is terminated.
In the preferred embodiment, the signal processing is digitally implemented, using a microprocessor.

REFERENCES:
patent: 3794905 (1974-02-01), Long
patent: 3979658 (1976-09-01), Foster

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