A Stand-alone Active Electromagnetic Interference Filter (AEF) IC Design for 3rd Generation Semiconductor-based Power System (ARD/308)

Nowadays 3rd generation semiconductors have been used in a lot of power applications, such as EV, motors, PV inverters, etc. However in a system that extensively uses the 3rd generation semiconductors, the EMI noise will be more difficult to tackle due to increased frequency and switching speed. Passive EMI filters, e.g. inductor and capacitor, are large, and overdesign decreases the practical system power density. This project aims to design a novel stand-alone active EMI filter (AEF) IC for common mode (CM) noise reduction for 3rd generation semiconductor-based power conversion systems. The proposed methodologies include: 1) using an AEF IC circuit to virtually boost up Y capacitance at EMI noise band; 2) integrating components into IC to save space and lower external design complexity; 3) resistive internal compensation network design to achieve sufficient PSRR; 4) designing internal positive and negative feedback in a ratio format to gain sufficient accuracy. The proposed IC design would develop a standalone filter IC to provide an effective and easy-to-install noise filtering method for end-users, which will further increase the power density of 3rd generation semiconductor-based power conversion system. It will also be beneficial to the end-users with a cleaner and smaller power supply system.