A design method of ac busbar for IGBT power assembly

The design scheme of paralleling multiple IGBTs in power assembly to increase the current capacity is widely used in power electronic equipment. In order to ensure the equipment's safe operation, the power assembly's uneven current problem is a design difficulty. This paper analyzes the influence of ac and dc busbar stray inductance on the uneven current problem from the circuit model perspective, and put forward a method to improve the current sharing performance, which is to adjust the ac busbar stray inductance based on the dc busbar stray inductance. Taking a vehicle motor controller as the research object, designing an ac busbar with this design method. The experimental results confirmed the validity of this method.