How to eliminate differential mode power line interference in power line carrier PLC?

Eliminating differential-mode power line interference in power line carrier PLCs requires constructing a targeted differential-mode filtering network. At the power input, a π-type filter circuit should be deployed, using a power inductor such as a PWRA6045R6R8M0T connected in series between the live and neutral wires, along with an X2 safety capacitor for inter-line filtering. For high-frequency differential-mode noise, a PBZ1608E600Z0T ferrite bead can be connected in series on the power line; its high impedance characteristics can effectively attenuate differential-mode interference in the MHz band. In the carrier coupling circuit, a differential coupling transformer is used to achieve isolated transmission of the carrier signal and the power line. Simultaneously, a TVS diode SMBJ24CA is deployed at the power supply end of the sensitive circuit to absorb differential-mode surge voltage. Through a multi-stage differential-mode filtering design, power line differential-mode noise can be suppressed by more than 30dB.