Current Balancing of Interleaved Boost PFC Converter with Auxiliary Winding Coupled Inductor

This paper proposes a current imbalance detection and current balancing control strategies for an interleaved boost power factor correction (PFC) converter with an auxiliary winding coupled inductor (AWCI). The auxiliary winding in the coupled inductor detects the magnetic flux imbalance as the form of the voltage. To extract the current imbalance information from the voltage, the filter circuits and the detection algorithms are suggested. After that the current balancing is performed using the current imbalance information. Compared to the traditional method, the proposed method is simple, reliable, and cost-effective. To verify the effectiveness of the proposed method, the simulations and the experiments are conducted based on a 4-kW prototype hardware. Through the results, it is confirmed that the current imbalance in the converter is significantly reduced.