Analysis and Design of Three Phase Single Stage Isolated Flyback Based PFC Converter with a Novel Clamping Circuit

In this paper, a three phase isolated flyback based single stage power factor corrected (PFC) converter with a novel clamping circuit for aircraft application is presented. The steady state operation and design calculations of the converter are presented in detail. The converter is operated in discontinuous conduction mode (DCM) due to its inherent advantages such as PFC, reduced number of sensors, zero diode reverse recovery losses and zero current switching on. The converter requires only one sensor, which makes the system cost effective, more reliable and robust. By using the proposed clamping circuit, the transformers leakage inductance energy is captured successfully in a clamping capacitor, and subsequently a secondary 24V DC supply is derived by connecting a forward converter across the clamping capacitor. The performance of the converter is validated through the simulation and experimental results.