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:
Dec. 10, 2013
Filed:
Apr. 18, 2012
Kazuhiro Kumada, Hyogo, JP;
Yosikazu Kado, Hyogo, JP;
Satoru Nagata, Hyogo, JP;
Kazuhiro Nisimoto, Hyogo, JP;
Kazuhiro Kumada, Hyogo, JP;
Yosikazu Kado, Hyogo, JP;
Satoru Nagata, Hyogo, JP;
Kazuhiro Nisimoto, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A power supply includes: a step-down chopper unit for stepping down a DC voltage from a DC power source to a voltage required for lighting; and a dimming control unit which dims the light source by alternately repeating a switching ON period during which a drive signal having a frequency higher than that of the dimming signal is supplied to the switching element and a switching OFF period during which the supply of the drive signal to the switching element is stopped. Further, the power supply includes an inrush current prevention unit for preventing an inrush current occurring when the DC power source is turned on, and a compensation unit which applies a drive voltage to the thyristor in the switching OFF period.