Interleaved dual-edge modulation scheme for double-input converter to minimize inductor current ripple

In the power system with two or more renewable energy sources, it can simplify the circuit configuration and reduce the cost by using a multiple-input converter instead of several single-input converters. Taking double-input buck converter (DIBC) as the example, this paper discusses the relationship between the inductor current ripple and the phase difference among the drive signals, and an interleaved dual-edge modulation (IDEM) is proposed in order to minimize the ripple. As a result, the filter inductor can be reduced significantly, leading to a fast dynamic response and a high power density. The IDEM can be applied in other double-input converters. A 400 W prototype of a DIBC is fabricated to verify the effectiveness of the IDEM.