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:
Mar. 27, 2001
Filed:
Mar. 09, 2000
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A discharge-lamp lighting circuit has a switching power source portion (a DC—DC converter) for converting DC voltage and a control circuit for controlling output voltage of the converter by ON/OFF-controlling a switching device constituting the converter. The length of the ON-period of the switching device is changed with respect to a predetermined length of the OFF period to control the ratio of the two periods. In this manner, stable lighting of a discharge lamp and improved lighting efficiency are realized by the light circuit because a change in input/output conditions (change in the power source or a state of a load) of the lighting circuit of the discharge lamp cannot easily exert an influence.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile