In switching power supplies, noise is generated by the switching. This noise is conducted to the AC power supply cable. The cause of this noise does not meet as Mains Terminal Interference Voltage. Therefore, noise suppression is required for switching power supplies.

Noise Emission Status for Switching Power Supplies Noise Suppression Model for Ordinary Switching Power Supplies     Noise Tendencies in Switching Power Supplies Examples of Conventional Suppression against Strong Differential Mode Noise Effective Suppression Methods against Differential Mode Noise using Hybrid Choke Coils Examples of Confirming the Effectiveness of Hybrid Choke Coils   < References > Differential Mode Noise and Common Mode Noise Functions of Respective Noise Filters Reasons Why Common Mode Choke Coils Contain Differential Mode Inductance