How to protect against EPSEFT electrical fast pulse?

EPS protection against Electrical Fast Transient/Burst (EFT/B, IEC61000-4-4) primarily focuses on preventing rapidly rising pulse group interference from coupling into the system through power and signal lines. Protection strategies include:

1. Power Port Protection: Using common-mode inductors (such as the CMZ series) in conjunction with Y capacitors at the AC/DC power input to form a low-pass filter, attenuating high-frequency pulse groups. Ferrite rings can also be connected in series on the power lines to enhance the effect.

2. Signal/Control Port Protection: Using common-mode chokes (such as the CML series) at communication and I/O ports to suppress common-mode interference, and combining them with transient voltage suppressor diodes (TVS) or ESD protection devices to absorb energy.

3. Good Grounding and Shielding: Providing a clean, low-impedance grounding reference point for the above filtering and protection devices. Proper grounding of the cabinet and cable shielding guides interference to the chassis.

4. Software Fault Tolerance: Adding a watchdog timer, digital filtering (debouncing) of input signals, and error checking and retransmission mechanisms for communication protocols to the MCU software as a supplement to hardware protection.