How to protect against power-to-power-connection interference in a power DTU?

Protecting against DTU power-mode interference requires both hardware absorption and software fault tolerance. On the hardware side, a TVS diode (SMCJ24CA) is deployed at the power line inlet to absorb the instantaneous high voltage during insertion and removal. A parallel X capacitor (0.47μF) and a series common-mode inductor (CML3225A-510T) filter out high-frequency oscillations. On the software side, an insertion/removal detection mechanism is added, entering a silent mode in case of an anomaly. Through simulation analysis of insertion/removal transients, the protection circuit parameters are optimized. In actual testing, after 1000 insertion/removal cycles, the system should show no damage and the communication recovery time should be less than 1 second. Protecting against insertion/removal interference can improve system reliability and extend its service life.