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:
Mar. 09, 1976
Filed:
Feb. 21, 1974
Applicant:
Inventor:
Philip A Hoffman, Towson, MD (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ; G05F / ;
U.S. Cl.
CPC ...
320 22 ; 320 39 ; 320D / ; 323-4 ;
Abstract
Disclosed is an improved circuit for recharging batteries. It can be used with alternating current power sources having a wide range of voltage and frequencies and also with low voltage direct current power sources. A transistor switch is connected in a feedback circuit to have, in effect, a variable resistance such that the charging current is high when the source potential is low and decreases to zero as the source potential increases. Charging efficiency is thereby significantly increased.