Optimum design of a flyback PV microinverter under hybrid DCM/BCM operation

The Current-Source Flyback microinverter is widely used in ac-PV module applications, either in Discontinuous Conduction Mode (DCM), Continuous Conduction Mode (CCM) or Boundary Conduction Mode (BCM). The recently proposed hybrid DCM/BCM operation inherits the merits of both discrete conduction modes and improves the converter performance. In this work a power loss analysis of the hybrid operation is conducted for each converter component and a design optimization algorithm is applied, focusing on the appropriate selection of each converter component and parameter, in order to achieve maximum weighted efficiency. The mathematical analysis is validated using a laboratory experimental prototype.