The Active Gate Driver Based on Hardware Closed-Loop Control for Crosstalk Suppression of SiC MOSFETs With Kelvin-Source Connection

Silicon carbide (SiC) mosfets with Kelvin-source connection are widely used in power converters based on a bridge configuration circuit, but crosstalk significantly impacts reliability and limits their application potential. For this problem, this article presents an active gate driver (AGD) based on hardware closed-loop control. A simple hardware closed-loop controller is designed to regulate the gate-source voltage of SiC mosfets. For aspect one, the closed-loop structure can reduce the peak voltage of crosstalk online. For aspect two, since the closed-loop structure can ensure the convergence of the gate-source voltage, a higher drive voltage is then permitted to shorten switching time and power loss. Compared with conventional methods, the proposed AGD can suppress crosstalk without adding switching loss. Experimental results verify the superiority of the proposed AGD for the SiC mosfet-based bridge configuration circuit.