Comparison of magnetic coupling topologies for interleaved multilevel inverters

This paper presents a study and comparison in terms of magnetic circuit sizing for two magnetic coupling topologies for interleaved multilevel inverters: the cyclic cascade and the secondary loop. This comparison includes modeling of both topologies and simulation analysis of the sizing of each of them. The interleaved multilevel inverter is then simulated with the sized magnetic components for the system operating point for both topologies. Then, a secondary loop improvement study is developed and simulated to minimize the sizing current for this topology. Finally, an experimental test bench is presented to test and analyze the experimental results for both topologies for a measurement power point of 10 kW.