Research of Modeling and Control on Push-Pull Forward Converter

This paper presents a push-pull forward converter,which can be used for the pre-isolated inverter and has some superiority in low voltage and high current situation.According to the principle of isolated DC/DC converter,small signal math model of PPF converter is established by using state-space averaging method under the assumption conditions of low-frequency,small signal and small ripple wave.Then the MATLAB software is used to carry through the assistant analysis,and design the control parameters and automatic closed control system based on the theoretical analysis.Finally,the simulation and experimental results show that the system(prototype)has perfect dynamic and static character,which verifies the validity of the mathematical model and the feasibility of the control strategy.