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I read an electronic magazine in which there is a report on there is a traditional method that can control ICLs. After reading, I became interested in inrush current limiters. So I searched some related materials and information about this topic. Today I come to this forum to turn to you to discuss my ideas are appropriate. Here are my personal understandings: In the AC / DC converter start moment, because the filter capacitor charging will produce a large inrush current, it is more than the system normal current Times to several times. Surge current will seriously pollute the power supply network, affecting the normal operation of other electronic equipment. Sometimes damage the power switch, fuse, EMI filters, rectifier bridge, filter capacitors, and even printed circuit boards and other components. Sometimes, although no visible damage is seen, recessive damage reduces the device The reliability of this is even worse. In order to improve the input characteristics of switching power supply, improve its reliability, reduce the pollution of the power grid, improve the electronic design The use of the environment must be limited to the surge current. The traditional method of limiting the inrush current is that the power consumption is large, the second surge, and the instantaneous power Can not move and other issues. The new inrush current limiting device, the KJH inrush current limiter, fundamentally solves these problems. It is well known that when the AC / DC converter is powered up, the surge current can be reduced by increasing the loop resistance of the charging capacitor C charging circuit. There are two traditional methods: 1. In the circuit in series with a suitable resistor (the resistance into a negative temperature coefficient thermistor is an improvement), both the surge current can be limited to an acceptable range, without affecting the normal work of the converter; 2. In the circuit in series with a pair of contacts in parallel with a combination of contacts, so that the contact at power on, the resistance in series in the loop to limit the role of inrush current, when the power into a certain state Contact connected, the resistance short circuit to reduce power consumption, to ensure the normal operation of the power supply. Inrush current limiter, which is the use of negative temperature coefficient thermistor and half bridge switch to complete the combination of limiting inrush current function. Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of inrush current limiters. I need continual learnings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help ? thanks in advance