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Title:
LIGHTING CIRCUIT, VEHICLE LAMP, AND DRIVING METHOD FOR LIGHT SOURCE
Document Type and Number:
WIPO Patent Application WO/2018/047915
Kind Code:
A1
Abstract:
A lighting circuit (400) drives a light source (310) that contains a plurality of N (N is an integer of two or more) light-emitting elements (312) connected in series. A bypass switch circuit (450) contains a plurality of N bypass switches (452), and each bypass switch (452) is connected in parallel to a single corresponding light-emitting element from among the plurality of light-emitting elements (312). A constant current drive circuit (440) supplies a drive current that has been stabilized to a target current to the light source (310). A light distribution controller (470) controls the bypass switch circuit (450). A certain light distribution pattern defines the duty cycle Di (%) of each of the plurality of N light-emitting elements. The plurality of light-emitting elements having a duty cycle sum that is 100% or less constitutes a unit of control. The light distribution controller (470) controls the plurality of bypass switches (452) such that the plurality of light-emitting elements contained in the same unit of control do not light up at the same time.

Inventors:
MARUYAMA Yuta (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
MURAKAMI Kentarou (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
MURAMATSU Takao (Shizuoka Plant, 500, Kitawaki, Shimizu-k, Shizuoka-shi Shizuoka 64, 〒4248764, JP)
Application Number:
JP2017/032341
Publication Date:
March 15, 2018
Filing Date:
September 07, 2017
Export Citation:
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Assignee:
KOITO MANUFACTURING CO.,LTD. (4-8-3, Takanawa Minato-ku Tokyo, 11, 〒1088711, JP)
International Classes:
H05B37/02; B60Q1/04
Domestic Patent References:
WO2007093938A12007-08-23
Foreign References:
JP2009134933A2009-06-18
US20110221352A12011-09-15
JP2015174549A2015-10-05
JP2015153657A2015-08-24
Attorney, Agent or Firm:
MORISHITA Sakaki (2-11-12, Ebisu-Nishi Shibuya-ku Tokyo, 21, 〒1500021, JP)
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