Small Signal modeling of Flyback Converter as Voltage Regulator in DCM Mode for C-130 Aircraft Application

In this paper we describe small signal models for Flyback converter as power Factor Preregulators in Discontinuous Conduction Mode (voltage follower approach) and constant frequency، using CIECA approach. In fact، a low power factor reduced the power available from the utility grid، while a high harmonic distortion of the line current causes EMI problems and cross_ interferences، through the line impedance، between different systems connected to the same grid. Implementations with and without input voltage feed forward، using resistive load، constant power and constant current loads are analyzed، and their respective transfer function are obtained. The applicability of an integrated circuit (usually used in continuous conduction mode) in the control loop is also presented. Simulation results are presented، validating the models to be used in control loop design.