Current-balancing technique for paralleled interleaved inverters with magnetically coupled inductors

Coupled inductors can be used to connect cells in parallel in a voltage source inverter to increase both rated power and bandwidth. To successfully implement this strategy it is critical to achieve a balanced contribution to the output current by all paralleled cells. Circulating currents should also be controlled and minimized to prevent additional losses in the switching devices. This paper presents an effective method to achieve current sharing between inverter cells paralleled via magnetically coupled inductors, using a state feedback controller. Experimental results are presented validating the performance of the proposed balancing method.