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. 16, 2003
Filed:
Jan. 18, 2002
Hiroyasu Kisaichi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention provides a discharge lamp lighting device and illumination device which can be miniaturized with high power factor and also is inexpensive. In the discharge lamp lighting device, in response to the zero crossing detected signal of a commercial AC power source detected by a detecting section, a voltage boosting/dropping circuit boosts or drops the commercial AC power source full-wave rectified by a rectifying circuit so that the current flowing through the discharge lamp is larger in the vicinity of the phases of 90° and 270° of the commercial AC power source than in the vicinity of the phases of 0° and 180° thereof, and a polarity changing circuit changes the polarity of the boosted or dropped current to be supplied to the discharge lamp. An illumination device is provided with such a discharge lamp lighting device.