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. 11, 1989
Filed:
Jul. 21, 1988
Applicant:
Inventor:
Benjamin Eng, Jr, Everett, WA (US);
Assignee:
John Fluke Mfg., Co. Inc., Everett, WA (US);
Primary Examiner:
Int. Cl.
CPC ...
H02J / ; G05F / ;
U.S. Cl.
CPC ...
320 35 ; 323907 ;
Abstract
A battery charger supplies to a battery an output voltage having a desired temperature coefficient of voltage. The charger includes an operational amplifier having a summing junction to which a reference current and a feedback signal derived from the amplifier output are supplied. The V.sub.be multiplier circuit includes a bipolar transistor which is biased into its active region so that the charging voltage supplied by the amplifier is temperature corrected in accordance with a negative coefficient of voltage characteristic of the transistor.