Improved LED junction temperature measurement system based on LabVIEW

In order to easily and accurately measure the junction temperature of high-power LED, this paper designs a new k-value calibration module based on LabVIEW platform, and develops an improved LED junction temperature measurement system by combining hardware equipment such as thermostat, data acquisition card, constant current source and temperature sensor, aiming at the huge workload brought by fitting the voltage temperature coefficient K under large current with small current data and the measurement error caused by self heating effect. The measurement system can measure the LED junction temperature in real time and store the required data. Compared with the measured junction temperature by forward voltage method, the maximum relative error is 1.4%, which indicates that the system has high measurement accuracy.