Comparison of multi-phase interleaved boost converters with various coupled inductor topologies

Gökmen, Raşit
Multi-phase interleaved boost converters are widely used in high power applications thanks to their high efficiency, high power density, increased output power capability and low input current ripple features. However, increasing the phase number results in an increase in the overall volume of the converter. In order to reduce the volume of the converter, inductors in multi-phase interleaved boost converters can be coupled. For a two-phase interleaved boost converter, loosely-coupled inductor (LCI), close-coupled inductor (CCI) and integrated-winding coupled inductor (IWCI) are the most popular coupled inductor topologies. To clarify the advantages of one coupled inductor topology over the others, 2kW two-phase interleaved boost converters with these coupled inductor topologies are compared under the condition where converters input current ripple and output filter size are kept constant. By this way, changing the inductor type does not have an effect on the rest of converter where the same filter components can be used for all converters with different inductor topologies. For each coupled inductor topology, a systematic design methodology is proposed and all inductors are designed by using these methodologies. A figure of merit (FOM) is developed based on the total power loss of the converters and inductors total volume and weight to compare overall performances. Designs are experimentally verified and the results show that all topologies with coupled inductors have a better efficiency compared to the converter with discrete inductors and LCI topology is found to have the best FOM among all designs.


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Citation Formats
R. Gökmen, “Comparison of multi-phase interleaved boost converters with various coupled inductor topologies,” M.S. - Master of Science, Middle East Technical University, 2022.