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. 09, 2003
Filed:
Feb. 11, 2002
Applicant:
Inventors:
Assignee:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 ;
U.S. Cl.
CPC ...
G05F 1/00 ;
Abstract
In a discharge-lamp lighting circuit , a DC-DC converter circuit for boosting or lowering DC input voltage Vin from a DC power supply , a DC-AC converter circuit for converting the output voltage of the DC-DC converter circuit to AC voltage, and a control circuit for controlling the supply of electric power to a discharge lamp are provided. Further, the supply of power to the discharge lamp is decreased in response to the lowering of the DC input voltage when the lowering of the DC input voltage Vin is detected. The supply of power to the discharge lamp is lowered as the ambient temperature rises even though the lowering of the DC input voltage Vin remains unchanged.