Gate Driver Circuit with All-Magnetic Isolation for Cascode-Connected SiC JFETs in a Three-Level T-Type Bridge-Leg

This article presents a gate driver circuit with all-magnetic isolation for driving silicon carbide (SiC) power devices in three-level T-type bridge-leg. Gate circuitry SiC has to be tolerant of rapid common-mode voltage changes. With respect the resultant potentially problematic current paths, an arrangement transformers is proposed supplying drive signals and their local floating circuits. The high-frequency carrier phase-switching technique used reduce number transformers. Signal timing other implementation issues are addressed when using this converter. demonstrated 540 V bridge-leg constructed around 650 1200 cascode-connected normally-on junction field effect transistors (JFETs).