Suppression of Switching Crosstalk and Voltage Oscillations in a SiC MOSFET Based Half-Bridge Converter

Haider Zaman, Xiaohua Wu, Xiancheng Zheng, Shahbaz Khan and Husan Ali
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Haider Zaman: School of Automation, Northwestern Polytechnical University, Xi’an 710000, China
Xiaohua Wu: School of Automation, Northwestern Polytechnical University, Xi’an 710000, China
Xiancheng Zheng: School of Automation, Northwestern Polytechnical University, Xi’an 710000, China
Shahbaz Khan: School of Automation, Northwestern Polytechnical University, Xi’an 710000, China
Husan Ali: School of Automation, Northwestern Polytechnical University, Xi’an 710000, China

Energies, 2018, vol. 11, issue 11, 1-19

Abstract: The silicon carbide (SiC) MOSFET is characterized by high operating voltage, temperature, switching frequency and efficiency which enables a converter to achieve high power density. However, at high switching frequency, the crosstalk phenomenon occurs when the gate voltage spike introduced by high dv/dt and voltage ringing forces false turn-on of SiC MOSFET which causes a crow-bar current thereby increasing switching losses. In order to increase the immunity against the crosstalk phenomenon in a half-bridge configuration, this paper presents a gate driver for SiC MOSFET capable of generating the negative turn-off voltage without using a negative power supply. In addition, the effect of parasitic inductances on the switching response is analyzed and an RC snubber is designed using high-frequency based circuit reduction technique to dampen the switching ringing. The performance of the proposed gate driver and the designed RC snubber is validated using simulation and experiment at the 1 MHz switching frequency. The results show that the proposed gate driver with RC snubber eliminates crosstalk by maintaining any spurious gate spike below the gate threshold voltage.

Keywords: SiC MOSFET; parasitic inductance; RC snubber; half-bridge converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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