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. 16, 2016
Filed:
May. 10, 2013
Koito Manufacturing Co., Ltd., Tokyo, JP;
KOITO MANUFACTURING CO., LTD., Minato-Ku, Tokyo, JP;
Abstract
A semiconductor light source control device includes a driver circuit, which generates a drive current Iout flowing through a plurality of LEDs connected in series and which performs control such that the amount of the drive current is brought close to a target value, and bypass switches, which are on-off controlled by a control signal, the bypass switches being connected in parallel with the corresponding LEDs. The semiconductor light source control device is configured such that when the control signal indicates the off-state of the bypass switches, a voltage across the corresponding LEDs is clamped at an upper limit by using the bypass switches.