车载充电机是纯电动汽车(Battery Electric Vehicles,BEVs)和插电式混合动力电动汽车(Plug-in Hybrid Electric Vehicles,PHEVs)必不可少的设备,对于提高电动汽车的充电效率、续航里程有着重要的意义。文章对近年来电动汽车车载充电机...车载充电机是纯电动汽车(Battery Electric Vehicles,BEVs)和插电式混合动力电动汽车(Plug-in Hybrid Electric Vehicles,PHEVs)必不可少的设备,对于提高电动汽车的充电效率、续航里程有着重要的意义。文章对近年来电动汽车车载充电机的研究进展和现状进行了总结,对车载充电机的种类和拓扑结构进行了分析和对比,指出各种拓扑的优点及存在的问题与不足,最后对车载充电机研究的未来发展方向进行了展望。展开更多
Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching frequency.Besides,in highfrequency applications,the number of switching ti...Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching frequency.Besides,in highfrequency applications,the number of switching times increases,resulting in significant switching losses.To solve these issues,this paper proposes an improved modulation strategy for the single-phase three-level neutral-point-clamped(NPC)converter in CRM with PFC.By optimizing the discharging strategy and switching state sequence,the switching frequency and its variation range have been efficiently reduced.The detailed performance analysis is also presented regarding the switching frequency,the average switching times,and the effect of voltage gain.A 2 k W prototype is built to verify the effectiveness of the proposed modulation strategy and analysis results.Compared with the totem-pole PFC converter,the switching frequency regulation range of the three-level PFC converter is reduced by 36.48%and the average switching times is reduced by 45.10%.The experimental result also shows a 1.2%higher efficiency for the three-level PFC converter in the full load range.展开更多
文摘车载充电机是纯电动汽车(Battery Electric Vehicles,BEVs)和插电式混合动力电动汽车(Plug-in Hybrid Electric Vehicles,PHEVs)必不可少的设备,对于提高电动汽车的充电效率、续航里程有着重要的意义。文章对近年来电动汽车车载充电机的研究进展和现状进行了总结,对车载充电机的种类和拓扑结构进行了分析和对比,指出各种拓扑的优点及存在的问题与不足,最后对车载充电机研究的未来发展方向进行了展望。
基金supported in part by National Natural Science Foundation of China(No.52177193)in part by China Scholarship Council(CSC)State Scholarship Fund International Clean Energy Talent Project(No.[2019]157)。
文摘Two-level totem-pole power factor correction(PFC)converters in critical conduction mode(CRM)suffer from the wide regulation range of switching frequency.Besides,in highfrequency applications,the number of switching times increases,resulting in significant switching losses.To solve these issues,this paper proposes an improved modulation strategy for the single-phase three-level neutral-point-clamped(NPC)converter in CRM with PFC.By optimizing the discharging strategy and switching state sequence,the switching frequency and its variation range have been efficiently reduced.The detailed performance analysis is also presented regarding the switching frequency,the average switching times,and the effect of voltage gain.A 2 k W prototype is built to verify the effectiveness of the proposed modulation strategy and analysis results.Compared with the totem-pole PFC converter,the switching frequency regulation range of the three-level PFC converter is reduced by 36.48%and the average switching times is reduced by 45.10%.The experimental result also shows a 1.2%higher efficiency for the three-level PFC converter in the full load range.
