Analysis and Design of Three-Phase Interleaved Buck-Boost Derived PFC Converter

A three-phase interleaved two-channel buck-boost derived power factor correction (PFC) converter for more electric aircraft application (MEA) is presented in this paper. Typically, the converters operated in continuous conduction mode (CCM) require two control loops (inner current, outer voltage), and five sensors to implement PFC control algorithm. As the supply frequency in MEA is variable, the controller has to be designed for a wider bandwidth, which complicates the controller design, and also complicates the phase-locked-loop (PLL) design. On the other hand, the discontinuous conduction mode (DCM) operation realizes the natural power factor correction at mains supply without any current control loop. Further, the DCM operation eliminates four sensors, and makes the system more reliable and robust. Hence, the proposed converter is designed to operate in DCM. A simple voltage control is implemented for output voltage regulation. The converter steady state operation and its design are presented in detail. The converter analysis and design are validated with the simulation results from PSIM. Further, the advantages of the proposed converter are demonstrated by comparing the proposed interleaved two-channel converter with single-channel three-phase buck-boost derived PFC converter.