LED lamps work on the basis of current, and the electrical parameters mainly include forward, reverse voltage and reverse current, which are related to whether LED lamps can work normally and are one of the basis for judging the basic performance of LED lamps. So what are the basic performance measurement methods of LED lamps?
The thermal properties of LEDs have an important influence on the optical properties and electrical properties of LEDs. Thermal resistance and junction temperature are the main thermal characteristics of LED2. Thermal resistance refers to the thermal resistance between the PN junction and the surface of the case, that is, the ratio of the temperature difference along the heat flow channel to the power dissipated on the channel, and the junction temperature refers to the temperature of the PN junction of the LED.
The methods of measuring LED junction temperature and thermal resistance generally include: infrared micrograph method, spectroscopy method, electrical parameter method, photothermal resistance scanning method, etc. Using an infrared temperature measuring microscope or a micro thermocouple to measure the surface temperature of the LED chip as the junction temperature of the LED is not accurate enough.
At present, the commonly used electrical parameter method is to use the characteristic that the forward voltage drop of the LED PN junction has a linear relationship with the PN junction temperature, and obtain the junction temperature of the LED by measuring the forward voltage drop difference at different temperatures.
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