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:
Aug. 24, 2004
Filed:
Sep. 18, 2002
Joachim Muehlschlegel, Groebenzell, DE;
Abstract
A ballast for at least one electric incandescent lamp, having at least two switching elements (T , T ) that are coupled to one another with the formation of a first tie point (VP ), a drive circuit ( ) with at least one output for driving the switching elements (T , T ) with the aid of a drive signal that has a pulse duty factor (d) and an operating frequency (f ), and with an input for a dimming signal (U ), and a power transformer (Ü) whose primary side (L ) is coupled to the first tie point (VP ), it being possible to connect the electric incandescent lamp (LA ; LA ) to the secondary side (L ) thereof, the drive circuit ( ) being designed to vary the pulse duty factor (d) and the operating frequency (f ) of the drive signal as a function of the dimming signal (U ).