Abstract：Based on the detailed analysis of turning-off process of IGBT and the summarization of a series of key equivalent circuits and equations, a voltage-balancing method for series-connected IGBTs was put forward to solve voltage inequality. This method adopted a resistor-capacitor circuit on gate electrode. A mathematical formula was derived that can describe the influence of dynamic voltage unbalance and turning-off time inequality on series-connected IGBTs. The selection principle of the network parameters was also analyzed. A semi-physical model of IGBT based on Lumped Charge method was established, which was used to verify the IGBT gate resistance-capacity compensation network. The parameters of the compensation network under the actual test conditions were given. The test system of the series-connected IGBTs was established, and then the experimental verification was carried out under various voltage and current conditions. The results show that the proposed method can effectively control the deference between the turning-off delay time and the increasing speed of the turning-off voltage. That is, the dynamic peak voltage unbalance reduced from 14.4% to 6.3% under the condition of 2 000V/1 500A.
梅桂芳, 安昱, 张建. 基于门极阻容补偿网络的IGBT串联均压方法[J]. 电工技术学报, 2017, 32(4): 35-47.
Mei Guifang, An Yu, Zhang Jian. Voltage Balancing Method of Series-Connected IGBT Based on Resistor-Capacitor Circuit on Gate Side. Transactions of China Electrotechnical Society, 2017, 32(4): 35-47.
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