| 摘要 |
PROBLEM TO BE SOLVED: To provide a marker lamp system that notifies a short-circuit failure of a light emission element to a constant current power supply device.SOLUTION: A lighting control circuit 15 includes a lighting circuit 31, a load adjusting circuit 25, a controller 35 and a main voltage detection circuit 30. The lighting circuit 31 turns on a light emission element 16. The load adjusting circuit 25 performs opening/closing between a high voltage side and a low voltage side at the output side of an isolation transformer 12. The controller 35 controls the opening/closing of the load adjusting circuit 25. The lighting control circuit 15 controls the lighting state of the light emission element 16 by the lighting circuit 31, and makes the controller 35 control the load adjusting circuit 25 to open when the output voltage detected by the main voltage detection circuit 30 decreases to a predetermined value or less. A releasing device 14 is operated upon an input voltage from the lighting control circuit 15, and physically releases the connection between the isolation transformer 12 and the lighting control circuit 15 when the input voltage increases to a predetermined voltage or more.SELECTED DRAWING: Figure 1 |
