EMI Filter Design with Passive Components for Power Lines

EMI (Electromagnetic Interference) can be defined as any kind of disturbance or sign that causes reductions in the performance, deterioration or malfunction of electrical and electronic devices. This disturbance can be propagated by radiation or conduction. The use of EMI filters installed in the power line to suppress conducted noise is increasing day by day. Therefore, in this study, passive DC EMI filter has been studied to suppress both common and differential mode noises originating from the power supply. Due to the fact that this filter to be designed will be placed in the power line of the equipment, which has a maximum power consumption of 50 Watts and supplied with 28V DC, it is foreseen to be used in the military aviation industry. For this reason, the equipment on which the filter is installed must pass the CE102 test specified in the MIL-STD_461G standard, that is, the filter must have a noise suppression rate of 55dB at 0.5MHz. As a result, the desired noise suppression performance is achieved with the help of the EMI filter installed in the power line of the equipment, which is created using passive circuit elements.