| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED lighting circuit of a vehicle lighting fixture in which at least two LED assemblies are provided in parallel, capable of guaranteeing lighting of all the LED assemblies at a set voltage or greater even when an applied voltage supplied from a vehicle side fluctuates.SOLUTION: An LED lighting circuit for a vehicle lighting fixture turns on respective LEDs by imparting an applied voltage Vcc to two or more LED assemblies 2A, 2B from a vehicle side through a diode D1 for reverse connection prevention to make currents I1, I2 flow through the respective LED assemblies 2A, 2B. The LED lighting circuit for the vehicle lighting fixture is provided with a shutdown circuit 4 shutting down the currents flowing through the respective LED assemblies 2A, 2B when the applied voltage Vcc is lower than a predetermined set value VD, across the diode D1 and the LED assemblies 2A, 2B. |
