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. 03, 2015
Filed:
Mar. 05, 2014
Satoshi Kikuchi, Shizuoka, JP;
Takanori Namba, Shizuoka, JP;
Masayasu Ito, Shizuoka, JP;
Daijiro Arisawa, Kyoto, JP;
Mikio Motomori, Osaka, JP;
Satoshi Kikuchi, Shizuoka, JP;
Takanori Namba, Shizuoka, JP;
Masayasu Ito, Shizuoka, JP;
Daijiro Arisawa, Kyoto, JP;
Mikio Motomori, Osaka, JP;
Panasonic Corporation, Tokyo, JP;
Abstract
A semiconductor light source lighting circuit includes a voltage step-down unit configured to generate a drive voltage lower than an input voltage by turning on or off a first switching element in a voltage step-down mode, a voltage step-up unit configured to generate the drive voltage higher than the input voltage by turning on or off a second switching element in a voltage step-up mode, and a controller. The controller includes a charge pump unit configured to repeat charging from the drive voltage to a second capacitor and discharging from the charged second capacitor to the first capacitor in the voltage step-up mode, and a switch drive unit configured to apply a voltage higher than the voltage at the other end of the first switching element to the control terminal of the first switching element by using a voltage of the charged first capacitor.