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. 12, 2000
Filed:
Jul. 29, 1998
Applicant:
Inventors:
Demetri J Giannopoulos, Norwalk, CT (US);
Shenghong Wang, Yorktown Heights, NY (US);
Assignee:
Philips Electronics North America Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315307 ; 315308 ; 315D / ;
Abstract
A ballast for operating different types of lamp loads through identification of the lamp type during steady state operation of the lamp load. Lamp type recognition is achieved based on a comparison of the lamp load voltage and lamp load current data points stored in a random-access memory of a microprocessor to a plurality of V-I characteristic curves stored in a read-only memory of the microprocessor. Through this comparison, the ballast can distinguish among a number of different lamp loads having the same starting voltage.