source:other news release time:2023-03-21 Hits: Popular:led screen wholesaler
① Because LED is a one -way conductive device, it is necessary to use DC current or one -way pulse current to power LED.
② Since LED is an LED lighting device with a PN structure and has a potential power force, this forms a capable cavity voltage. Therefore, the voltage value added to the LED must exceed this threshold voltage, and the LED will be fully turned on. High -power LED has a limited voltage above 2.5V, and the voltage drop of LED at normal working is 3 to 4V.
③ The current and voltage characteristics of LED are non -linear. Because the current flowing the current value is equal to the electric potential of the power supply power supply to the power supply power supply to the LED, then divide the total resistance of the circuit (the sum of the power supply internal resistance, the lead resistance, the LED body resistance) It is not proportional to the voltage added at both ends of LED.
④ Since the LED PN has a negative temperature coefficient, LED's potential power momentum will be reduced when the temperature rises. Therefore, LEDs cannot directly use the voltage source to power, and the current limit measures must be taken. Otherwise, as the temperature increases when LED works, the current will become larger and damaged to the LED.
⑤ The ratio of the optical flux of the current to the LED and the optical flux of the LED is also non -linear. LED's optical flux increases with the increase in the current flowing through the LED, but it is not proportional. The less the optical flux increases later. Therefore, LEDs should work under a relatively high -emitting efficiency.
In addition, LED is the same as other light sources, and the electricity it can bear is limited. If the electricity added on the LED exceeds a certain value, the LED may be damaged. Due to the differences in production technology and material characteristics, the potential power of the same model LED and the internal resistance of LED are not exactly the same. Therefore, LED cannot be used directly.
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