Analysis and design of a multi-port converter using a magnetic coupling inductor technique

In the present paper, a novel multi-port converter with coupled magnetic components is analyzed and designed. The proposed circuit integrates two multi-phase converters and one isolated dc-dc converter. These converters can be controlled independently and simultaneously by duty cycle and phase-shift modulation, because the impedance behavior of magnetic components is different for each converter. A 1.5-kW prototype of the multi-port converter has been constructed and successfully operated under full power at a switching frequency of 40 kHz. The experimental waveforms confirm the theoretical analysis, and the conversion efficiency is above 90% over a wide range of output power. In addition, loss analysis is carried out in order to define the critical parts of the proposed converter.