Research And Application Of High Gain Interleaved Converter

Nowadays,power electronics has become a crucial field affecting the development of human society in the 21 st century.Power electronics applications such as switching power supply technology,HVDC transmission technology,new energy electric vehicles,and grid-connected solar photovoltaic power generation have made great contributions to human life.Circuit topology with interleave and parallel structure has become an important research field in power electronics because it can improve the voltage gain of converters,reduce the voltage stress of switching devices and reduce the ripple of input and output current.In the power factor correction circuit,the current THD of the ac side network can be reduced to improve the power factor.In this paper,the interleaved converter and interleaved active power factor correction circuit are studied and simulated.The principle of traditional interleaved boost converter and traditional interleaved buck converter is discussed.The principle and steady state operation of interleaved DCM high boost converter are analyzed.Compared with traditional interleaved boost converter,two DCM boost units composed of switch capacitor and relay diode are added to the topology to improve the voltage gain.The operating principle and steady-state operation of the interleave buck converter are analyzed.Compared with the traditional interleave buck converter,a switching capacitor and a network composed of switching capacitor,inductor and relay diode are added to the topology to improve the voltage gain.Matlab/Simulink simulation of several circuit topologies was carried out to verify the correctness of theoretical analysis.The simulation of single-phase active PFC circuit is carried out,and the interlaced technology and active PFC circuit are combined to simulate the circuit.The simulation results show that the interlaced active PFC circuit can reduce the current THD,reduce the current ripple and improve the power factor.