Title:
LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE
Document Type and Number:
Japanese Patent JP2018027736
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a lighting circuit capable of detecting an open abnormality.SOLUTION: A lighting circuit 400 drives a light emitting unit 301 including a first light source 302 and a second light source 304 connected to each other serially. A first pin Pis connected to one end of the first light source 302. A second pin Pis connected to a connection node of the first light source 302 and the second light source 304. A third pin Pis connected to one end of the second light source 304. A drive circuit 414 supplies a drive current Ito the light emitting unit 301. A bypass switch 430 and a first resistor Rare provided in parallel between the second pin Pand the third pin P. An abnormality detection circuit 460 detects an abnormality based on a detection voltage Vgenerated between the second pin Pand the third pin Pwhen an ON signal is given to the bypass switch 430.SELECTED DRAWING: Figure 2
Inventors:
YAGITSU SHOHEI
ITO MASAYASU
MURAMATSU TAKAO
ITO MASAYASU
MURAMATSU TAKAO
Application Number:
JP2016159700A
Publication Date:
February 22, 2018
Filing Date:
August 16, 2016
Export Citation:
Assignee:
KOITO MFG CO LTD
International Classes:
B60Q1/04; H05B44/00; B60Q11/00
Domestic Patent References:
| JP2015110357A | 2015-06-18 | |||
| JP2011243669A | 2011-12-01 | |||
| JP2011204437A | 2011-10-13 | |||
| JP2010272410A | 2010-12-02 | |||
| JP2015153657A | 2015-08-24 |
Foreign References:
| WO2012124522A1 | 2012-09-20 |
Attorney, Agent or Firm:
Sakaki Morishita
Yusuke Murata
Tomoyuki Miki
Yusuke Murata
Tomoyuki Miki
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