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What is the difference between electrostatic generator and lightning surge generator? Today, let’s talk about the differences between the two

Static electricity can usually be felt to a minimum of thousands of volts. The surge is usually the working voltage or the pulse current higher than the working voltage, which is related to the source of the surge. Usually, the surge time constant is larger than that of static electricity. At present, many USB sockets have links to anti surge components, and the working principle is close to that of Zener diodes. It can absorb static electricity and surges.

Lightning surge generator is part of EMC test. Lightning surge generator refers to the instantaneous high voltage generated on the power line, signal line and control line by lightning strike, which is generally suppressed by TVs.

Static electricity is brought by the living environment. Its voltage is very high, often tens of thousands of volts, but the current is very small, but the rising edge of the wave head is very high. As defined in IEC61000-4-2, the first rising edge of its current is between 0.7~1ns. Static electricity can affect the equipment through conduction and radiation.

Lightning surge generator induces the energy on our communication line through atmospheric discharge. The voltage varies with the length of the cable, but the magnitude is us level, and the frequency is usually about 100kHz, which can only affect our equipment through conduction. 8/20us is the current wave. The energy of 8us reaches 90% of the peak value, and the energy drops to half of the peak value at 20us.

Generally speaking, the degree of damage caused by static electricity is smaller, and once the lightning surge generator occurs, it may cause irreparable impact. Therefore, it is particularly important to prevent the occurrence of lightning surge generator.