Measurement of Junction Temperature in White LED

Measure the Junction temperature of LED downlight by infrared thermal imager,Pin temperature method and ANSYS simulation.The results show: Pin temperature method can accurately predict the chip Junction temperature by the pin temperature.Because of its non-destructive,accuracy,simplicity,non-contact,Pin temperature method can be widely used in the LED junction temperature measurement;Measurement tolerances mainly depends on the package thermal resistance tolerances;The package thermal resistance is the inherent attribute of the LED,without the influence of outside temperature and heat capacity,so Pin measuring method has the versatility.