Topology and control method of interleaved parallel DC/DC converters with ripple compensation for fuel cell applications

Interleaved topologies are commonly adopted in fuel cell DC/DC converters to eliminate current ripple. However, in low-power operations, multi-phase interleaved DC/DC converters affect the efficiency of DC/DC converters. To meet the requirements of low ripple and high efficiency of interleaved boost converters in low-power operation, an interleaved fuel cell DC/DC converter with a buck-boost ripple-compensation circuit is proposed in this study. This topology achieves ripple elimination by generating a waveform that is opposite to the input current ripple in the main circuit through a ripple-compensation branch. In addition, a phase-switching control strategy for interleaved parallel circuits is proposed to tackle the efficiency issues during low-power operation. The effectiveness of the proposed method is verified through experimental results.