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:
Feb. 01, 1983
Filed:
Jan. 16, 1981
Applicant:
Inventor:
Randolph D Shelly, Rosemere, CA;
Assignee:
Sperry Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
320 21 ; 320 32 ; 320 40 ;
Abstract
A non-dissipative battery charging circuit utilizing pulse width modulated constant current charging signals and having unregulated charging voltage stepped down by the use of a switching transistor and series inductor is described. Charging current is sensed and fed back to cause control of the charging cycle. Battery voltage is sensed and compared to a reference level for terminating charging when the battery is determined to be fully charged. A clocking and control system responsive to the feedback signals and the sensed voltage levels is described for controlling the activation and duration of application of charging current signals.