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:
Oct. 20, 2015
Filed:
Mar. 14, 2013
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Koji Takahashi, Kanagawa, JP;
Hiromichi Nakajima, Kanagawa, JP;
Kenji Sakai, Kanagawa, JP;
Hiroyuki Kudo, Kanagawa, JP;
Hirokazu Otake, Kanagawa, JP;
Hiroshi Terasaka, Kanagawa, JP;
Kiyoteru Kosa, Kanagawa, JP;
Yosuke Saito, Kanagawa, JP;
Masatoshi Kumagai, Kanagawa, JP;
Shinichiro Matsumoto, Kanagawa, JP;
Hideo Kozuka, Kanagawa, JP;
Kazuhiko Sato, Kanagawa, JP;
Tatsuya Konishi, Kanagawa, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Abstract
A power supply device includes a control circuit and a first circuit. The control circuit switches between a current control mode and a voltage control mode according to an inputted dimming signal and thus dims a light-emitting element. In the current control mode the control circuit controls an output current supplied to the light-emitting element to a target current, and in the voltage control mode the control circuit controls an output voltage supplied to the light-emitting element to a target voltage. The first circuit detects the output current and the output voltage, and sets the target voltage at which switching between the current control mode and the voltage control mode is carried out as a first voltage.