A novel method for current balancing between parallel-connected IGBTs

Parallel-connected IGBTs are prone to large-current destruction in high-power applications due to current unbalance between each IGBT branches. This paper proposes a novel control method to improve the current balance in order to protect the device against over current destruction. The method uses two control loops to confine the current rising speed as well as to reconcile the current change start time difference. Without current measurement or any manual operation, the implementation is thus simple and convenient. Details about the strategy and its superiority are discussed. Simulation results validate the effectiveness of the proposed method.