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:
Sep. 15, 2009
Filed:
Sep. 25, 2007
Nancy H. Chen, North Andover, MA (US);
Joseph A. Olsen, Gloucester, MA (US);
Nancy H. Chen, North Andover, MA (US);
Joseph A. Olsen, Gloucester, MA (US);
OSRAM Sylvania Inc., Danvers, MA (US);
Abstract
A method of controlling run-up of a metal halide lamp that has a nominal (full) light output during steady state operation and that has a current limit I, includes a lamp ballast sensing lamp current and voltage and calculating power, and evaluating requested power Pand requested current Ito operate the lamp at the nominal light output during run-up to steady state operation, supplying Ito operate the lamp when I≧I, and supplying Pto operate the lamp when I<I. The method may determine Pin various ways, including determining a light output L of the lamp; comparing lamp voltage to a nominal voltage Vfor the lamp during steady state operation; determining energy E delivered to the lamp; and estimating lamp efficacy. The method may also be used to characterize an unknown lamp attached to the ballast.