Title:
LIGHTING DEVICE AND ILLUMINATING DEVICE
Document Type and Number:
Japanese Patent JP2023161485
Kind Code:
A
Abstract:
To provide a lighting device or the like which comprises a constant current circuit and can suppress a failure of the constant current circuit at a time of an abnormality occurence.SOLUTION: A lighting device 10 comprises: a voltage source circuit 20 that supplies a supply voltage to an anode terminal Ta of a light source 12; a constant current circuit 80 that controls a current value of a supply current as a current flowing through the light source 12; a comparison circuit 30 that compares a cathode voltage as a voltage of a cathode terminal Tc of the light source 12 and a reference voltage; and an abnormality voltage detection circuit 40 that detects an abnormality of the cathode voltage by comparing the cathode voltage and a threshold voltage. The voltage source circuit 20 controls a voltage value of the supply voltage so that the cathode voltage coincides with the reference voltage on the basis of a comparison result of the comparison circuit 30. The abnormality voltage detection circuit 40 stops the supply current on the basis of the comparison result of the cathode voltage and the threshold voltage.SELECTED DRAWING: Figure 1
Inventors:
SORA YUJI
MAYAMA NAOKI
SHIRATO YOSHINORI
MAYAMA NAOKI
SHIRATO YOSHINORI
Application Number:
JP2022071911A
Publication Date:
November 07, 2023
Filing Date:
April 25, 2022
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
H05B45/50; H05B45/345; H05B47/16
Attorney, Agent or Firm:
Hiromori Arai
Eisaku Teratani
Shinichi Michisaka
Eisaku Teratani
Shinichi Michisaka