Research On Power Factor Correciton Of Electric Vehicle Charger

With the increase number of pure electric vehicles and plug-in hybrid vehicles,it’s necessary to research and design a highly efficient car charge.At present,the main circuit of the electric vehicle charger is generally AC/DC converter and DC/DC converter.This paper studied the AC/DC converter part.The rectifier bridge loss in traditional power factor correction(PFC)schame with input rectifier bridge is the most part in all losses.Bridgeless PFC is introduced to improve the efficiency in PFC converter.This paper introduces the development of PFC technology from bridge PFC to bridgeless PFC.Current BOOST bridgeless PFC topology and their respective advantages and disadvantages are summarized in this paper.Then it summarizes the research hotspot of totem-pole BOOST PFC,which has simple structure and small common mode interference.However,in totem-pole BOOST bridgeless PFC circuit,the body diodes of two switches tubes replaces the fast recovery diodes which work as freewheeling diodes in the conventional PFC.Therefore,this topology is not suitable for current continuous mode(CCM).It is only suitable for curent discontinuous mode(DCM)or current critical continuous mode(CRM).That’s to say it is suitable for medium and small power applications.In addition,the two switches in this topology need isolate drive,which is more complex than non-isolate drive.In order to bring totem-pole BOOST PFC to practical application,the principle of the PFC topology is analyzed in detail.The loss analysis model and the overall system design scheme,including the hardware and software design,are given in this paper.Finally,the simulation and experiment are carried out to verify the feasibility of the scheme.