Novel Low-Loss Filter for Overvoltage Mitigation in WBG-based Hard Switching Electric Drives with AC cables

Wide-bandgap (WBG) power devices offer significant advantages for electric drives, including higher power density and efficiency. However, their fast-switching transients pose challenges in drives with long cables, where the impedance mismatch between cable and motor can lead to damaging overvoltage transients at motor terminals. Existing mitigation strategies suffer from drawbacks like filter size and losses. This paper introduces a novel low-loss overvoltage mitigation filter, the active RCD filter, which effectively mitigates overvoltage at motor terminals with minimal energy dissipation, enhancing drive efficiency.