Modeling of Conducted Electromagnetic Interference in DC-DC Converters of Shipping Platforms

When the high-power electrical equipment on the shipping platform works with the short-time work status, it will have a huge impact on the ship’s DC power grid. In order to reduce the impact, DC-DC converters are often used to charge large-capacity energy storage equipment first, and the energy storage equipment provides energy for other transient high-power electrical equipment. Since the impedance of the large-capacity energy storage equipment is time-varying when it is used as a load, the work status of the DC-DC converter is different from the previous work status. This paper proposes a time-domain theoretical modeling method of conducted electromagnetic interference (EMI) for a DC-DC converter-Buck circuit with short-time work status. The EMI theoretical calculation results are compared with the simulation simulated results of Simulink, and then it is used to analyze the EMI characteristics of the DC-DC converter.