Research on Power Loss Calculation and Optimization of FB-VSCC Active EMI Filter

The use of wide-bandgap semiconductor devices, with their high switching speed and efficiency, has gained widespread application in power electronics. However, their application also exacerbates electromagnetic interference (EMI) issues, posing challenges to traditional suppression strategies and creating an urgent need for advanced solutions to enhance system electromagnetic compatibility (EMC). Although passive EMI filters are widely used in engineering, their design for miniaturization and lightweighting under high power density conditions still faces certain limitations. This has spurred indepth research into active EMI filters (AEFs). AEFs feature various topologies and can achieve interference suppression within specific frequency ranges with a compact size. However, existing research often overlooks the power supply and power loss issues that limit AEF effectiveness. To address this, this paper takes the commonly used feedback voltage-sensing current-compensation (FB-VSCC) AEF as an example. The analysis first identifies the sources of power loss within the AEF and proposes a detailed method for calculating AEF power loss. Based on this, the relationship between power loss and EMI attenuation is explored. Optimization strategies for power loss, aimed at balancing insertion loss with system efficiency, are then proposed. Finally, the effectiveness of the optimization method was verified through simulation.