SiC Zener Diode for Gate Protection of 4.5 kV SiCGT
Zener voltages of the fabricated SiC Zener diodes with various nitrogen concentrations in the range from 7×1017 to 5×1019 cm-3 are 17 to 87 V, and decreased with an increase in the nitrogen concentration. Furthermore, in a chopper circuit using SiC Zener diodes for SiCGT gate protection, the commutated current decreases slowly even though cathode current falls rapidly, and the SiCGT gate is protected from surge voltage by SiC Zener diode. Moreover, the value of Zener voltage after the operation was the same as that before half bridge operation at 47 V.
Edouard V. Monakhov, Tamás Hornos and Bengt. G. Svensson
K. Nakayama et al., "SiC Zener Diode for Gate Protection of 4.5 kV SiCGT", Materials Science Forum, Vols. 679-680, pp. 559-562, 2011