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:
Jul. 05, 1988
Filed:
Feb. 13, 1987
Satoru Inakagata, Hikone, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A charge control circuit for a battery charger has a sensor circuit for sensing the temperature of a battery being charged and providing an output indicative thereof. A differentiator circuit converts the output of the sensor circuit into an instantaneous time derivative of thereof which is indicative of a corresponding temperature gradient of the battery. When the time derivative is determined by a judging circuit to be below a predetermined threshold indicative of the battery reaching its full charge state, the judging circuit responds to provide a first control signal, causing the battery charger to charge the battery at a high rate. Once the time derivative exceeds the threshold, the judging circuit provides a second control signal, causing the charger to terminate the high rate charge and change to a trickle charge or zero rate charge.