Journal
ENERGIES
Volume 16, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/en16031226
Keywords
cascode-connected; gate driver; isolation; JFET; silicon carbide; T-type converter
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This article presents a gate driver circuit with all-magnetic isolation for driving silicon carbide (SiC) power devices in a three-level T-type bridge-leg. The circuit addresses the issue of rapid common-mode voltage changes in SiC devices with an arrangement of transformers providing drive signals and power to the devices. The high-frequency carrier phase-switching technique is used to reduce the number of transformers. The circuit is demonstrated in a 540 V bridge-leg constructed around SiC JFETs.
This article presents a gate driver circuit with all-magnetic isolation for driving silicon carbide (SiC) power devices in a three-level T-type bridge-leg. Gate driver circuitry for SiC devices has to be tolerant of rapid common-mode voltage changes. With respect to the resultant potentially problematic common-mode current paths, an arrangement of transformers is proposed for supplying the power devices with drive signals and power for their local floating gate driver circuits. The high-frequency carrier phase-switching technique is used to reduce the number of transformers. Signal timing and other implementation issues are addressed when using this arrangement with the T-type converter. The circuit is demonstrated in a 540 V bridge-leg constructed around 650 V and 1200 V cascode-connected normally-on SiC junction field effect transistors (JFETs).
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