Gate Drive Circuits
Technical Lecture Session
Gate Drive Circuits I
Wide-bandgap, gate driver, dead time, cross conduction
This work introduces a novel gate driver for use with wide-bandgap devices in high-precision applications. A low-cost digital isolator connects the high and low-side drivers and prevents cross conduction. It automatically ensures a minimal dead-time determined by its propagation delay. Each driver is powered by an isolated unipolar supply, but a differential drive scheme provides negative gate-source voltages to withstand fast switching speeds. The driver is tested in a double-pulse setup at 400 V and reaches dead-times as low as 14 ns.