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:
Feb. 28, 2017
Filed:
Nov. 07, 2012
Panasonic Corporation, Osaka, JP;
Sana Esaki, Osaka, JP;
Akinori Hiramatu, Nara, JP;
Abstract
In a first control mode, a control circuit turns a switching element on and off at a predetermined oscillating frequency and an On time so that a current flows through inductor in continuous mode without a sleep interval. In a second control mode, control circuit fixes oscillating frequency of switching element and changes On time of switching element. In a third control mode, control circuit fixes On time of switching element and changes oscillating frequency of switching element. Second control mode and third control mode are allocated for at least two intervals of intervals into which a dimming range is divided. Control circuit selects first control mode to fully light a light source load, and then, if a dimming ratio is designated, control circuit selects one of second and third control modes according to the interval, to which the dimming ratio corresponds, to dim light source load.