摘要
针对IGBT串联阀运行过程分压不均衡,从IGBT器件原理上分析了影响串联分压不均衡的因素。采用RCD无源吸收回路减缓关断过程中dv/dt以抑制过电压,从均压效果和IGBT关断时间两方面对均压电容取值进行了分析,并对实验波形从理论上进行了分析。实验结果表明在门极驱动信号同步情况下,RCD吸收回路可有效抑制关断过程过电压。
In view of the unbalanced pressure distribution during the operation of IGBT series valves,the factors affecting unbalanced pressure distribution in series are analyzed from the principle of IGBT devices.The dv/dt of RCD passive absorption circuit is used to reduce the over-voltage during switching-off.The voltage-equalizing capacitance is analyzed from two aspects of voltage-equalizing effect and IGBT switching-off time,and the experimental waveform is analyzed theoretically.The experimental results show that the RCD absorption circuit can effectively suppress the switching overvoltage when the gate driving signal is synchronized.
作者
薛博文
Xue Bowen(Xi′an Railway Vocational and Technical Institute, Xi′an, Shaanxi 710026, China)
出处
《西安铁路职业技术学院学报》
2019年第2期8-12,共5页
Journal of Xi’an Railway Vocational & Technical Institute
关键词
IGBT串联
均压
RCD吸收
IGBT Series Connection
Equalizing Voltage
RCD Absorption
