A Six Level Gate-Driver Topology with 2.5 ns Resolution for Silicon Carbide MOSFET Active Gate Drive Development

This paper presents a new high-bandwidth multilevel gate-drive topology for use in Silicon Carbide (SiC) Active Gate-Driver Development. The presented Modular Multilevel gate Driver (MMGD) is a voltage modulated gate-driver topology that has a resolution of 2.5 ns and a current source/sink ability of approximately 5A, allowing for driving of high-power SiC MOSFETS. The MMGD is formed of off-the-shelf components, and so is readily reproducible. The speed of the gate-driver has been found to be fast enough to effectively PWM the gate of a high-power SiC MOSFET, allowing mutliple gate-driving strategies to be investigated. Experimental results using a 1.7 kV 300 A SiC MOSFET are given to validate the MMGDs ability to actively influence the switching behaviour of a high-power device.