Abstract. Light emitting diode( LED) is widely used because of its high efficiency, environmental protection, long life and so on. However, the use of LED is affected by the performance of the driving power supply, especially in the complex and poor working environment. Therefore, it is very important to improve the stability of the driving power supply, and to add the lightning protection circuit to the LED driver technology. According to the basic requirements of multilevel surge protection, this paper analyses the lightning protection circuit of a common LED driving power supply.
IntroductionWith the rapid development of LED technology, LED has been widely used because of its high efficiency, long life and environmental protection and so on [1][2][3]. The use of LED also needs to match the corresponding drive power. However, the life of the drive power supply is much less than the life of the LED light source, which severely restricts the overall life of LED lamps. In addition, LED drive power supply environment is sometimes relatively poor, especially in the natural environment of lightning [4].At present, the protection circuit almost will be put in the input of the LED driver power supply.The components that used to ensure the safe and stable operation of the circuit have more types, which including gas discharge tube, a voltage sensitive resistor, diode and positive temperature coefficient thermistor (PTC), but the precise research on lightning protection circuit model is still few. People just based on a single or a few parameters to design the circuit, failing to consider the overall performance of the circuit, insufficient element short life, lightning residual pressure is too large [5][6].To solve the above problems, this paper puts forward to optimize the lightning protection circuit, the circuit model is built by simulation software to verify the design, to provide a more comprehensive reference to the power supply protection circuit, according to the basic requirements of multi-level protection surge, lightning protection circuit principle analysis of a common LED driver and the existing problems.
