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. 10, 2015
Filed:
Mar. 16, 2012
Go Kato, Yokosuka, JP;
Takuro Hiramatsu, Yokosuka, JP;
Kenji Sakai, Yokosuka, JP;
Chikako Katano, Yokosuka, JP;
Hiroshi Takenaga, Yokosuka, JP;
Tomoaki Shimizu, Yokosuka, JP;
Go Kato, Yokosuka, JP;
Takuro Hiramatsu, Yokosuka, JP;
Kenji Sakai, Yokosuka, JP;
Chikako Katano, Yokosuka, JP;
Hiroshi Takenaga, Yokosuka, JP;
Tomoaki Shimizu, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Kanagawa, JP;
Abstract
According to one embodiment, a power supply device includes a rectifying circuit configured to rectify an alternating-current power supply, a first capacitor configured to smooth a voltage after rectification, and a falling voltage chopper circuit configured to supply electric power to a load. The first capacitor is set to a capacity in which a section where a voltage after smoothing drops to an output voltage to the load is provided in a rectified half period of the alternating-current power supply. The falling voltage chopper circuit includes at least one switching element configured to receive an input of the voltage after smoothing, operate in a section where the voltage after smoothing exceeds the output voltage, and pause in a section of the output voltage and a second capacitor provided on an output side and having a capacity larger than the capacity of the first capacitor.