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. 21, 2023
Filed:
Oct. 07, 2020
Applicant:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
KOITO MANUFACTURING CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 45/375 (2020.01); H05B 45/44 (2020.01); H05B 45/52 (2020.01); F21S 41/663 (2018.01); F21S 41/141 (2018.01); H05B 45/34 (2020.01); B60Q 1/14 (2006.01); B60Q 11/00 (2006.01); H05B 45/56 (2020.01); F21Y 115/10 (2016.01); F21W 102/135 (2018.01); F21S 41/151 (2018.01); H05B 47/17 (2020.01);
U.S. Cl.
CPC ...
H05B 45/375 (2020.01); B60Q 1/1407 (2013.01); B60Q 1/1423 (2013.01); B60Q 11/005 (2013.01); F21S 41/141 (2018.01); F21S 41/663 (2018.01); H05B 45/34 (2020.01); H05B 45/44 (2020.01); H05B 45/52 (2020.01); H05B 45/56 (2020.01); B60Q 2300/05 (2013.01); F21S 41/151 (2018.01); F21W 2102/135 (2018.01); F21Y 2115/10 (2016.08); H05B 47/17 (2020.01);
Abstract
A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage Vacross each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature T.