US 11,956,870 B2
Light-source device
Daisuke Mori, Komatsushima (JP); Hironobu Shibata, Tokushima (JP); Ryosuke Mori, Anan (JP); Masaki Omori, Toshima-ku (JP); and Hideki Kondo, Yokohama (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Appl. No. 17/785,899
Filed by NICHIA CORPORATION, Anan (JP)
PCT Filed Dec. 8, 2020, PCT No. PCT/JP2020/045742
§ 371(c)(1), (2) Date Jun. 15, 2022,
PCT Pub. No. WO2021/124994, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-228191 (JP), filed on Dec. 18, 2019.
Prior Publication US 2023/0023001 A1, Jan. 26, 2023
Int. Cl. H05B 45/345 (2020.01); H01S 5/06 (2006.01); H02M 3/156 (2006.01); H05B 45/14 (2020.01)
CPC H05B 45/345 (2020.01) [H01S 5/06 (2013.01); H05B 45/14 (2020.01); H02M 3/156 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light source device to supply a constant current to a diode load, the diode load comprising a plurality of light-emitting elements connected in series, the light source device comprising:
a power supply circuit configured to be connected to the diode load; and
a peak current limiting circuit configured to be connected in series to the diode load,
wherein the peak current limiting circuit comprises
a current detector connected in series to the diode load, and
a current-regulating circuit configured to control a current to the diode load by a detection voltage of the current detector, and
wherein the current detector comprises a series circuit comprising a resistor and a coil, the current detector configured to detect the detection voltage across the resistor and the coil.