New EMI Active Hybrid Active‐Passive Filter With Mixed Voltage‐Current Injection Dedicated to a GaN Based Boost Converter in kW Range

In this article, we propose a novel hybrid EMI filtering technique that directly considers line currents instead of the traditional approach based on their decomposition. This method naturally accounts for propagation characteristics without requiring explicit separation. A black‐box EMC model is developed for a GaN‐based DC‐DC converter, enabling the calculation of the required attenuation per power line. Based on this model, we design a new hybrid active/passive filter architecture, implementing mixed injection techniques—voltage injection on line 1 and current injection on line 2. To validate this approach, a proof‐of‐concept prototype is developed and tested, demonstrating an attenuation of nearly 50 dB up to 3 MHz, confirming the effectiveness of this filtering strategy.