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:
May. 10, 2011
Filed:
Dec. 01, 2006
Hiroshi Itoh, Chiba, JP;
Sakae Saitoh, Chiba, JP;
Mitsuyoshi Seo, Funabashi, JP;
Akinobu Takeda, Tokyo, JP;
Hiroshi Itoh, Chiba, JP;
Sakae Saitoh, Chiba, JP;
Mitsuyoshi Seo, Funabashi, JP;
Akinobu Takeda, Tokyo, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A transformerand a photocouplerare provided to ensure insulation between a primary side circuit sectionconnected to an alternating current power supply, and a secondary side circuit sectionfor applying a voltage to a lamp. A detection circuit sectionE, provided in the secondary side circuit section, detects an output voltage and an output current of the lampto detect a deviation from a predetermined power. A signal corresponding to the deviation, which has been detected by the detection circuit sectionE, is transmitted to the primary side circuit sectionvia the photocouplerprovided between the primary side circuit sectionand the secondary side circuit section. A switching control section, provided in the primary side circuit section, carries out switching control for constant power lighting based on the signal transmitted from the photocoupler