Active Cancellation of the Electromagnetic Emissions at the Input of a Periodically Operating Motor Inverter by Injecting Synthesized and Synchronized Signals

Power electronic systems can be a significant source of electromagnetic emissions. To meet requirements regarding the electromagnetic compatibility, passive filters are conventionally applied which tend to be bulky and heavy. Active filters are a promising alternative. In this contribution, a special variant of active filtering based on synthesized and synchronized signals is applied to a motor inverter. After a brief explanation of the method, the challenges in conjunction with a motor inverter are discussed. Demonstrator results are shown, and optimizations of this setup are presented.