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:
Nov. 21, 1995
Filed:
Nov. 09, 1993
Applicant:
Inventor:
Wayne A Madsen, Kokomo, IN (US);
Assignee:
Delco Electronics Corporation, Kokomo, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G / ; H05B / ;
U.S. Cl.
CPC ...
3151694 ; 315337 ; 315168 ; 3151693 ; 345 75 ;
Abstract
An efficient power supply for a vacuum fluorescent display having a battery or other unregulated source supplies the grid voltage directly from the battery and supplies the anode voltage via a step-up regulator. To eliminate apparent display brightness changes upon variation of battery voltage, the battery voltage and the anode voltage are fed back to the regulator, adjusting the regulated anode voltage inversely to the battery voltage. The direct coupling of battery to the grid eliminates the necessity of regulating or converting the grid voltage, allowing a smaller power supply to be used and minimizing heat losses.