Light emitting diode lighting device, lighting fixture using the light emitting diode lighting device, and vehicle lighting fixture

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting turn-on device that suppress occurrence of erroneous judgment at low temperature with securing safety at high temperature, and a lighting device and an in-vehicle mount lighting device that use the light-emitting turn-on device.SOLUTION: A light-emitting diode turn-on device has a DC power supply circuit 2 for converting input DC power to predetermined DC power and output the predetermined DC power to a light-emitting diode array LD, a temperature detecting element Rs for detecting temperature, an output voltage detecting circuit 34 for detecting the output voltage Vout of the DC power supply circuit 2. The light-emitting diode turn-on device 1 has a control circuit 30 for reducing the output current Iout of the DC power supply circuit 2 when the output voltage Vout detected by the output voltage detecting circuit 34 increases to an upper limit voltage or more. The control circuit 30 reduces the upper limit voltage as the temperature of the light-emitting diode array LD is higher, the temperature being estimated on the basis of the output of the temperature detecting element Rs.