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. 11, 2014
Filed:
Mar. 23, 2012
Koji Watanabe, Kyoto, JP;
Hiromitsu Mizukawa, Osaka, JP;
Nobuo Ukita, Hyogo, JP;
Kazuhiro Nishimoto, Nara, JP;
Koji Watanabe, Kyoto, JP;
Hiromitsu Mizukawa, Osaka, JP;
Nobuo Ukita, Hyogo, JP;
Kazuhiro Nishimoto, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A lighting device is capable of realizing a stable dimming control in a wide range of light output. The lighting device includes a DC power circuit for providing power to a switching element of the lighting device. A current controller switches the switching element to enable a current to flow from the DC power circuit through a solid state light source and maintain the current from the DC power circuit through the solid state light source current controller at a predetermined current. The current controller includes a first switching controller operable to change a width of an on-pulse provided to the switching element and a second switching controller operable to determine a burst-on time during which the on-pulses determined by the first switching controller are provided to the switching element. The burst-on time is longer than an on-pulse period of the first switching controller.