Title:
LIGHT SOURCE MODULE AND LIGHTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2021/187260
Kind Code:
A1
Abstract:
Provided is a rear marker light capable of increasing safety. An LED string (502) includes four LEDs (504_1 to 504_4) which are connected in series. An LED driver circuit (610) receives a battery voltage (VIN) and supplies a drive current (ILED) stabilized by a target current (IREF) to the LED string (502). A bypass circuit (620) synchronizes a bypass current (IBYPASS) which corresponds to the battery voltage (VIN) and is provided in parallel to a section (503) to be bypassed which includes two adjacent LEDs (504_3, 504-4) in the LED string (502).
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Inventors:
ICHIKAWA TOMOYUKI (JP)
OZAWA ATSUSHI (JP)
MIWA MARIKO (JP)
MATSUMOTO YUTAKA (JP)
OZAWA ATSUSHI (JP)
MIWA MARIKO (JP)
MATSUMOTO YUTAKA (JP)
Application Number:
PCT/JP2021/009422
Publication Date:
September 23, 2021
Filing Date:
March 10, 2021
Export Citation:
Assignee:
KOITO MFG CO LTD (JP)
International Classes:
B60Q1/44; H01L33/00; H05B45/48; H05B45/54
Foreign References:
| JP2020013642A | 2020-01-23 | |||
| JP2019192478A | 2019-10-31 | |||
| JP2015168305A | 2015-09-28 | |||
| JP2016197711A | 2016-11-24 | |||
| JP2020047976A | 2020-03-26 |
Other References:
See also references of EP 4122766A4
Attorney, Agent or Firm:
FUJIOKA, Takahiro (JP)
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