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:
Aug. 02, 2012
Yuji Takahashi, Kanagawa-ken, JP;
Noriyuki Kitamura, Kanagawa-ken, JP;
Koji Suzuki, Kanagawa-ken, JP;
Koji Takahashi, Kanagawa-ken, JP;
Toru Ishikita, Kanagawa-ken, JP;
Yuji Takahashi, Kanagawa-ken, JP;
Noriyuki Kitamura, Kanagawa-ken, JP;
Koji Suzuki, Kanagawa-ken, JP;
Koji Takahashi, Kanagawa-ken, JP;
Toru Ishikita, Kanagawa-ken, JP;
Toshiba Lighting & Technology Corporation, Yokosuka-shi, Kanagawa-ken, JP;
Abstract
A switching power supply includes a switching element, a constant current element, a rectifying element, a first inductor, a second inductor, and a control circuit. If the switching element is on, the switching element supplies a power supply voltage to the first inductor and feeds an electric current. The constant current element turns off the switching element if the electric current of the switching element exceeds a predetermined upper limit. The rectifying element feeds the electric current of the first inductor if the switching element is turned off. The second inductor supplies the induced potential to a control terminal of the switching element. The control circuit supplies a pulse-like potential to a control terminal of the constant current element and outputs if an average of the potential is lower than a lower limit.