Prediction and Simulation Analysis of Current Turn-off Behavior of Low-Voltage DC Circuit Breaker

Abstract

Abstract As the key breaker of hybrid DC circuit breaker, IGBT is the research focus of hybrid DC circuit breaker.In this paper, a steady state simulation model of IGBT is built based on the Darlongton equivalent structure.Through the actual output characteristics of IGBT, the feasibility of the steady-state simulation model of IGBT is verified.Then, a driving simulation model considering the positive and negative bias of IGBT drive output is built.In order to establish a more accurate transient model of IGBT, a semi-empirical MOS3 model considering weak inverse conductivity is adopted in the MOSFET model and a Gummel-Poon model considering multiple secondary effects is adopted in the BJT model.According to the experimental data, the feasibility of IGBT transient model is verified, and the construction of IGBT transient model under the DC breaking condition is completed.