A Simple dv/dt and di/dt Closed-loop Active Gate Driver for SiC MOSFETs

This study proposes a novel active gate driver (AGD) to mitigate voltage and current overshoot issues for silicon carbide (SiC) MOSFETs. The AGD integrates the advantages of existing architectures with a closed-loop dv/dt and di/dt hybrid control mechanism, ensuring adaptability to varying load conditions. The circuit design employs simple BJT followers and passive resistor-capacitor networks, offering real-time feedback, rapid transient response and straightforward implementation. Experimental and simulation results demonstrate that the proposed AGD effectively suppresses voltage and current overshoot, while reducing switching losses by 23-35% compared to conventional gate drivers during hard-switching operations. The AGD's simplicity, cost-effectiveness, and versatility validate its practicality for high-performance SiC MOSFET systems, proving its potential in modern power electronics applications.