Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1976-08-18
1978-05-23
Hickey, Robert J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 37, 320 30, H02J 704
Patent
active
040913201
ABSTRACT:
Automatic battery charging apparatus in which a control signal is generated by subtracting a signal representing a fraction of the mains supply voltage from the battery voltage so that the control signal represents the state of charge of the battery irrespective of variations in the mains voltage. The charge is terminated when the rate of rise of the control signal falls below a predetermined value; this condition is sensed by sampling the output frequency of a voltage controlled oscillator whose frequency is directly proportional to the control signal. In one arrangement the output frequency is fed to an up-down counter for a sampling period (2 minutes) with the counter counting up and then, after an interval of 30 minutes, the output frequency is fed to the counter for a further sampling period (1 minute 55 seconds) with the counter counting down. If the counter fails to return to zero at the end of a down count the charge is terminated.
REFERENCES:
patent: 3841336 (1974-10-01), Daynard
patent: 3886427 (1975-05-01), Long
patent: 3979658 (1976-09-01), Foster
Chloride Group Limited
Hickey Robert J.
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