Protection for AC220V power ports

Application details

Scheme Description
Meets standard requirements
Program features

AC220V is the standard mains voltage of many countries and regions in the world (such as China, Europe, etc.), widely used in the following scenarios, such as household appliances such as air conditioners, refrigerators, washing machines, televisions, industrial equipment such as motors, PLC controllers, frequency inverters, imaging equipment (such as CT, MRI), life support systems (such as ventilators) and other medical equipment. For communication infrastructure such as base stations, servers, and switches, lightning strikes or power grid surges may cause short circuit damage or even fire in AC220V applications. Through reasonable protection design can significantly improve the reliability of devices under extreme conditions such as lightning strikes to ensure long-term and stable operation of the system.

IEC 61000-4-5、GB/T 17626.5、EN61000-4-5

1, The front-end fuse provides protection against circuit overload, short circuits;

2, The cost-effective solution using conventional parallel varistor between L-N differential mode;

3, The common mode L/N line respectively uses a varistor and then connected in series with a ceramic gas discharge tube to PE to provide a surge discharge path;

4, The power NTC connected in series on the N-line effectively suppresses inrush current during power-on;

5, To meet the insulation withstand voltage test of the input to the ground, need to adjust the voltage parameters of the GDT.

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