The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1976
Filed:
Feb. 25, 1975
George William Foster, Bolton, EN;
Chloride Group Limited, London, EN;
Abstract
An automatic battery charger of taper type has means for comparing a reference signal with a control signal varying with battery voltage, and terminating the charge when the rate of rise of battery voltage falls below a predetermined value. To prevent spurious operation due to mains voltage variation, the control signal comprises the difference between a signal dependent on battery voltage and a signal dependent on a.c. supply voltage. The rate of rise of the control signal is monitored by comparing it with a staircase reference voltage which is increased by a step whenever the control signal exceeds it, and termination is initiated if the time interval between two steps exceeds a given period. This may be long enough, e.g. half an hour, to provide an equalizing charge without requiring additional equipment.