An Active Common Mode EMI Filter Approach introducing Predictive Pulsed Compensation

Due to the miniaturization of power electronics in vehicles, the necessary electromagnetic interference (EMI) filter are getting in focus for size and weight. This has led to the development of active EMI filters. Conventional active filters are using an analog control loop to reduce the disturbances on the power lines. The disadvantage of analog active EMI filters is, that the analog components are expensive compared to passive filter components. To address this issue, an approach for an active EMI filter only using cheap power electronics components, is introduced. The implementation of this Predictive Pulsed Compensation method is illustrated and validated on a Phase Shifted Full Bridge DC/DC Converter in a CISPR 25 test setup.