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:
May. 01, 2007
Filed:
Nov. 10, 2004
Andrew O. Johnsen, Danvers, MA (US);
Bernhard Ertl, Munich, DE;
Guy P. Bouchard, Beverly, MA (US);
Vipin Madhani, Burlington, MA (US);
Andrew O. Johnsen, Danvers, MA (US);
Bernhard Ertl, Munich, DE;
Guy P. Bouchard, Beverly, MA (US);
Vipin Madhani, Burlington, MA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
A circuit for operating a high intensity discharge (HID) lamp includes an H-bridge connected between a common terminal and a power line, and a control circuit connected to the H-bridge. The control circuit includes a transformer having a primary winding connected between the common terminal and a power terminal and a secondary winding connected between the common terminal and the power line, and a current sense resistor connected in series between the secondary winding and the common terminal. The HID lamp is connected to the common terminal and to the second winding so as sense a current across the current sense resistor.