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:
Aug. 05, 2014
Filed:
Sep. 14, 2011
Noriyuki Kitamura, Kanagawa-ken, JP;
Yuji Takahashi, Kanagawa-ken, JP;
Koji Takahashi, Kanagawa-ken, JP;
Toru Ishitaka, Kanagawa-ken, JP;
Koji Suzuki, Kanagawa-ken, JP;
Noriyuki Kitamura, Kanagawa-ken, JP;
Yuji Takahashi, Kanagawa-ken, JP;
Koji Takahashi, Kanagawa-ken, JP;
Toru Ishitaka, Kanagawa-ken, JP;
Koji Suzuki, Kanagawa-ken, JP;
Toshiba Lighting & Technology Corporation, Kanagawa-ken, JP;
Abstract
According to one embodiment of the invention, there is provided a switching power supply device including a rectifying circuit and a switching operation conversion circuit. The rectifying circuit receives a phase-controlled alternating voltage to rectify to a direct voltage. The switching operation conversion circuit starts up by being applied with the direct voltage, and includes a normally on type switching element and an off driving circuit. The normally on type switching element passes an input current, and the off driving circuit turns off the switching element when the input current reaches a prescribed value. The switching operation conversion circuit converts the direct voltage to an output voltage different from the direct voltage by repeating a switching operation of turning on and off the switching element.