Title:
LIGHTING TOOL FOR VEHICLE AND LIGHT SOURCE LIGHTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2017/022633
Kind Code:
A1
Abstract:
A converter controller 32a controls a switching converter 30. A current detection circuit 34 generates a current detection signal VCS corresponding to a coil current IL of the switching converter 30. An error amplifier 102 amplifies an error between the current detection signal VCS and an analog signal VADIM indicating a supply current to a semiconductor light source 10, and generates an error signal VERR. A hysteresis converter 36 compares the current detection signal VCS with an upper threshold signal VTHH and a lower threshold signal VTHL that are determined according to the error signal VERR, and generates a control pulse SCNT corresponding to a comparison result. A driver 38 drives a switching transistor M1 in response to the control pulse SCNT.
Inventors:
ICHIKAWA TOMOYUKI (JP)
KIKUCHI SATOSHI (JP)
KIKUCHI SATOSHI (JP)
Application Number:
PCT/JP2016/072203
Publication Date:
February 09, 2017
Filing Date:
July 28, 2016
Export Citation:
Assignee:
KOITO MFG CO LTD (JP)
International Classes:
H05B37/02; B60Q1/04; H02M3/155; H05B44/00
Foreign References:
| JP2013093214A | 2013-05-16 | |||
| JP2009009817A | 2009-01-15 | |||
| JP2013258003A | 2013-12-26 | |||
| JP2010273447A | 2010-12-02 | |||
| JP2010176853A | 2010-08-12 |
Other References:
See also references of EP 3334255A4
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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