Research on current sharing of paralleled IGBTs in different DC breaker circuit topologies

Abstract

Abstract. IGBT modules used in series and parallel to satisfy the requirement in high-power DC circuit breakers are often prone to large-current destruction due to current unbalance between paralleled IGBTs. It is of great importance to identify the current unbalance causes and to find a method optimizing the current sharing of paralleled IGBTs. In this paper the current-sharing influencing factors are discussed and verified by simulation. Two possible circuit topologies used in DC circuit breakers are proposed and simulated to see their performance in current sharing. The results show that one of them can provide us with a simple and effective method to achieve good current balancing in the DC circuit breaker application.

Improvement of the mathematical model of single­phase half­bridge inverter in state­variable form

“…This allows to use a fixed equivalent circuit for open and closed states of the transistor. It is assumed in [3] that capacitance between IGBT leads does not depend on the voltage between the collector and the emitter, which reduces the accuracy of the transients simulation. In [4] only the static dependences of spurious capacitances from the voltage on the device are considered, the dynamic component is ignored.…”