Analysis of Voltage Imbalance Between Inner and Outer Power Tubes of Three-level Converter

doi:10.16628/j.cnki.2095-8188.2023.05.004

Abstract

Abstract:

The voltage imbalance between the inner and outer power tubes may occur during the transition between the adjacent switching states of the three-level converter.The mechanism of voltage imbalance is studied.The research results show that the phenomenon is caused by the energy of the distributed inductance in the circuit releasing to the equivalent capacitance between CE of the IGBT.The RC buffer circuit can suppress the above-mentioned voltage imbalance of the inner and outer power tubes.Finally,the principle is analyzed and verified by experiments.

Key words: three-level converter, the voltage imbalance between the inner and outer power devices, distributed inductance, RC buffer circuit

CLC Number:

TM46

SHANG Yang, WANG Yongsheng, WEI Chao, HUANG Haihong. Analysis of Voltage Imbalance Between Inner and Outer Power Tubes of Three-level Converter[J]. LOW VOLTAGE APPARATUS, 2023, 0(5): 25-29.

Figures/Tables 10

References 7

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电路状态	电路输出电压	VT1	VT2	VT3	VT4	状态函数
S1	E	通	通	断	断	1100
死区时间	0	断	通	断	断	0100
S0	0	断	通	通	断	0110
死区时间	0	断	断	通	断	0010
S-1	-E	断	断	通	通	0011

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