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:
Dec. 10, 1991
Filed:
Dec. 07, 1989
Applicant:
Inventor:
Robert B Schlenk, Louisville, KY (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315278 ; 315226 ; 315289 ; 315D / ; 331110 ;
Abstract
A lamp driver circuit includes a high voltage secondary winding connectable to a gas discharge lamp. The secondary is wound on a magnetic core together with a pair of primary windings. The primary windings are coupled to one another as well as to an R-C network and an amplifier stage, the latter of which comprises a plurality of fast-switching transistors connected in parallel with one another. The bases of each of the transistors are connected to the R-C network by way of an element such as an incandescent lamp filament whose resistance varies with the current through the element.