Abstract:

The switching power supply is an important device for power conversion and power transmission.However,the low power factor and high harmonic content of the traditional switching power supply brings a series of serious problems to the power system.This paper designs a simulation model of the fly-back PFC converter combining the fly-back circuit in traditional DC/DC transform and the PFC circuit based on Boost with average current mode control as the control strategy.The circuit is simulated by Matlab software.The simulation results show that the scheme is a valid control strategy.

Key words: fly back circuit;power factor;Matlab simulation;switching power supply