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:
Nov. 26, 2013
Filed:
Jan. 25, 2011
Naoko Iwai, Yokosuka, JP;
Hajime Osaki, Yokosuka, JP;
Kenichi Asami, Yokosuka, JP;
Hitoshi Kawano, Yokosuka, JP;
Masatoshi Kumagai, Yokosuka, JP;
Naoko Iwai, Yokosuka, JP;
Hajime Osaki, Yokosuka, JP;
Kenichi Asami, Yokosuka, JP;
Hitoshi Kawano, Yokosuka, JP;
Masatoshi Kumagai, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, an LED lighting device includes a DC source, a non-insulated step-down chopper and a light emitting diode. The non-insulated step-down chopper includes: a first circuit in which a switching element, a current detecting impedance element and an inductor are connected in series to each other; a second circuit in which the inductor and a freewheel diode are connected in series to each other; and a control portion for controlling the switching element. A power portion including the switching element and the control portion are constituted by a single package IC, and the current detecting impedance element and inductor are attached to the outside of the IC.