Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
VEHICLE LAMP, LIGHTING CIRCUIT THEREFOR, DRIVER CIRCUIT, AND DRIVER-INTEGRATED LIGHT SOURCE
Document Type and Number:
WIPO Patent Application WO/2019/198604
Kind Code:
A1
Abstract:
A lighting circuit (200) lights a plurality of semiconductor light sources (102). A plurality of electric current sources (210_1 to 210_N) are respectively connected in series to corresponding semiconductor light sources (102). A switching converter (220) supplies a drive voltage (VOUT) between the ends of each of a plurality of series-connected circuits formed by the plurality of semiconductor light sources (102) and the plurality of electric current sources (210). A converter controller (230) controls a switching transistor (M1) of the switching converter (220) in accordance with the relationship between an end-to-end voltage (VLED) of any of the plurality of electric current sources (210) and a reference voltage having a positive correlation with a temperature (Tj).

Inventors:
ICHIKAWA Tomoyuki (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
KIKUCHI Satoshi (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
MATSUHANA Ryosuke (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
Application Number:
JP2019/014888
Publication Date:
October 17, 2019
Filing Date:
April 03, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KOITO MANUFACTURING CO.,LTD. (4-8-3, Takanawa Minato-ku Tokyo, 11, 〒1088711, JP)
International Classes:
H05B37/02; B60Q1/04
Foreign References:
JP2014236302A2014-12-15
JP2007200828A2007-08-09
JP2017010810A2017-01-12
JP2009012669A2009-01-22
Attorney, Agent or Firm:
MORISHITA Sakaki (2-11-12, Ebisu-Nishi Shibuya-ku Tokyo, 21, 〒1500021, JP)
Download PDF: