CN113964921B - 一种多端口新能源电动汽车充电电路 - Google Patents

一种多端口新能源电动汽车充电电路 Download PDF

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CN113964921B
CN113964921B CN202111285069.XA CN202111285069A CN113964921B CN 113964921 B CN113964921 B CN 113964921B CN 202111285069 A CN202111285069 A CN 202111285069A CN 113964921 B CN113964921 B CN 113964921B
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voltage
inductor
bridge
buck
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CN113964921A (zh
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凌在汛
向慕超
崔一铂
刘曼佳
陈文�
郭雨
郑景文
金晨
焦海文
沈骏杰
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Hubei Fangyuan Dongli Electric Power Science Research Co ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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Hubei Fangyuan Dongli Electric Power Science Research Co ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

本发明提供一种多端口新能源电动汽车充电电路，包括第一电路、第二电路、第三电路及第四电路；第一电路包括依次串接的交流输入端、线路电感Lg、降压变压器N、滤波电感Lf及三相全桥整流器，交流输入端作为第一输入端口用于接入电网电压源Ug，第一电路将降压后的交流电压整流得到直流电压Udc1；第二电路为全桥电路，用于接入外接输入电压Uin，升压后变为直流电压Udc1，第三电路为隔离DC‑DC降压变换器，用于将直流电压Udc1降低为Udc2，第四电路为双buck电路，输入电压Udc2经降压后变为符合电动汽车充电标准的直流电压。本发明可接入储能装置或者分布式电源，与电网电压一同为电动汽车充电，提高充电可靠性。

Description

一种多端口新能源电动汽车充电电路
技术领域
本发明涉及电动汽车充电领域，具体是一种多端口新能源电动汽车充电电路。
背景技术
随着国家对电动汽车的大力推广，相关的电动汽车充电服务设施也在积极的建设当中，目前充电系统主要采用电网供电的方式，因为充电站要面向公共服务，受电动汽车数量、电池容量以及充电电压、电流等因素的影响，系统总容量可达到兆安级以上。当前我国汽车充电站建设正处于快速发展阶段，已建设投入运行的汽车充电站能为电动轿车、中巴车以及公交车等提供全天候的充电服务。
电动汽车充电站由电网供电，经过降压变压器得到低压交流电，经过AC-DC变换将交流电转换为直流电，经过DC-DC隔离变压器和BUCK电路输出符合电动汽车充电标准的直流电。现有技术一般是两端口充电电路，就是从电网直接给电动汽车充电，在电网故障或电力不足时，没有其他备用或辅助充电端口，导致充电可靠性不高。
发明内容
针对现有技术存在的上述不足，本发明提供一种多端口新能源电动汽车充电电路，在现有充电电路的基础上，新引入一个端口作为新的输入，其可以接入储能装置或者分布式电源等，与电网电压一同为电动汽车充电，提高充电的可靠性。
本发明的技术方案实现如下：
一种多端口新能源电动汽车充电电路，包括第一电路、第二电路、第三电路及第四电路；所述第一电路包括依次串接的交流输入端、线路电感Lg、降压变压器N、滤波电感Lf及三相全桥整流器，交流输入端作为第一输入端口用于接入电网电压源Ug，电网电压源Ug通过线路电感Lg与降压变压器N相连，将降压后的交流电压输入三相全桥整流器，得到直流电压Udc1；所述第二电路为全桥电路，包括交错并联的前boost电路和后boost电路，用于接入外接输入电压Uin，外接输入电压Uin经过交错并联的双boost电路升压后变为直流电压Udc1，所述第三电路为隔离DC-DC降压变换器，用于将直流电压Udc1降低为Udc2输入给第四电路，所述第四电路为双buck电路，包括前buck电路和后buck电路，输入电压Udc2经过交错并联的双buck电路降压后变为符合电动汽车充电标准的直流电压。
进一步的，所述三相全桥整流器由6个开关管S1-S6组成三个桥臂，其中开关管S1、开关管S3、开关管S5为共阴极组，开关管S2、开关管S4、开关管S6为共阳极组。
进一步的，所述第二电路中的前boost电路包括开关管S7、开关管S8构成的前桥臂和电感Lb1，后boost电路包括开关管S9、开关管S10构成的后桥臂和电感Lb2，两个boost电路交错并联运行，相位差180°,电感Lb1和电感Lb2的一端的连接点作为第二输入端口接入外接输入电压Uin。
进一步的，每个开关管S7、S8、S9、S10由场效应管、续流二极管和谐振电容组成，场效应管的漏极、续流二极管的负极和电容的一端相连构成开关管的输入端，场效应管的源极、续流二极管的正极和电容的另一端相连构成开关管的输出端，开关管S7输出端和开关管S8的输入端的连接点通过电感Lb1与第二输入端口连接，开关管S9输出端和开关管S10的输入端的连接点通过电感Lb2与第二输入端口连接。
进一步的，所述第三电路包括前级全桥电路、后级全桥电路、电感L和脉冲变压器，前级全桥电路、后级全桥电路之间通过电感L和脉冲变压器，前级全桥电路与所述第二电路中交错并联运行的boost电路共用开关管S7、S8、S9、S10。
进一步的，前级全桥电路中的开关管S7输出端和开关管S8的输入端的连接点与电感L的一端连接，电感L的另一端与脉冲变压器初级的一端连接，前级全桥电路中开关管S9输出端和开关管S10的输入端的连接点与电感L的另一端与脉冲变压器初级的另一端连接，脉冲变压器的次级与后级全桥电路的输入端连接。
进一步的，所述第四电路中的前buck电路包括开关管S11、S12与电感Lb3，后buck电路包括开关管S13、S14与电感Lb4，两个buck电力交错并联运行，相位差180°。
进一步的，所述符合电动汽车充电标准的直流电压为48V。
本发明提供的一种多端口新能源电动汽车充电电路，相较于传统的充电电路，其设计的所述第二电路的输入端口可以作为一个新的输入，其可以接入储能装置或者分布式电源等，与电网电压一同为电动汽车充电，提高了充电的可靠性；第一电路通过三相全桥整流器实现AC-DC转换，通过交流侧的滤波电感可以有效降低谐波污染并提高功率因数；。
附图说明
图1为本发明一种多端口新能源电动汽车充电电路的电路拓扑图；
图2(a)第二电路其中一种工作状态的示意图，图2(b)第二电路另一种工作状态的示意图；
图3为本发明直流电压Udc1的波形图；
图4为本发明直流电压Udc2的波形图；
图5为本发明充电电压Vout的波形图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图1所示，一种多端口新能源电动汽车充电电路，包括第一电路1、第二电路2、第三电路3及第四电路4。
所述第一电路1包括交流输入端、线路电感Lg、降压变压器N及三相全桥整流器，交流输入端作为本发明充电电路的端口1，用于接入电网电压源Ug，电网电压源Ug通过线路电感Lg与降压变压器N相连，将降压后的交流电压输入三相全桥整流器，得到直流电压Udc1(如图3所示)。所述三相全桥整流器由6个全控性器件组成三个桥臂，其中开关管S1、S3、S5为共阴极组，开关管S2、S4、S6为共阳极组。
所述第二电路2为全桥电路，包括前boost电路和后boost电路，其中前boost电路包括开关管S7、S8构成的前桥臂和电感Lb1，后boost电路包括开关管S9、S10构成的后桥臂和电感Lb2，两个boost电路交错并联运行，相位差180°。电感Lb1和电感Lb2的一端的连接点作为本发明的端口2，用于接入外接输入电压Uin，输入电压Uin经过交错并联的双boost电路升压后变为直流电压Udc1。当开关管S7和S10导通时，其工作等效电路为图2(a)所示。当S7关断，S8导通时，其工作等效电路为图2(b)所示。
每个开关管(S7、S8、S9、S10)由场效应管、续流二极管和谐振电容组成，场效应管的漏极、续流二极管的负极和电容的一端相连构成开关管的输入端，场效应管的源极、续流二极管的正极和电容C的另一端相连构成开关管的输出端，开关管S7输出端和开关管S8的输入端连接点A1通过电感Lb1与端口1连接，开关管S9输出端和开关管S10的输入端连接点B1通过电感Lb2与端口1连接。
所述第三电路3为隔离DC-DC降压变换器，用于将直流电压Udc1降低为Udc2(如图4所示)，同时起到隔离的作用。所述隔离DC-DC变换器为全桥电路，前级全桥电路的开关管S7-S10(图1中标号5所示虚线框部分)构成前后两个桥臂，与第二电路2中交错并联运行的boost电路共用开关管S7-S10，从而节约了电路的体积和成本。
前级全桥电路与后级全桥电路之间通过电感L和脉冲变压器连接，具体的，前级全桥电路中的连接点A1与电感L的一端连接，电感L的另一端与脉冲变压器初级的一端连接，前级全桥电路中的连接点B1与电感L的另一端与脉冲变压器初级的另一端连接，脉冲变压器的次级与后级全桥电路的输入端连接。
所述第四电路4为双buck电路，包括前buck电路和后buck电路，其中前buck电路包括开关管S11、S12与电感Lb3，后buck电路包括开关管S13、S14与电感Lb4，两个buck电力交错并联运行，相位差180°。输入电压Udc2经过交错并联的双buck电路降压后变为符合电动汽车充电标准的直流电Vout(如图5所示)。
本发明工作过程如下：
S1、端口1电网侧电压源Ug经过降压变压器输出低压交流电压，
S2、低压交流电压然后经过AC-DC变换器(即三相全桥整流器)，将交流电变换成直流电Udc1；
S3、输入端口2的输入Uin经过两个交错并联的升压电路(boost电路)将输入电压变为Udc1；
S4、直流电压Udc1经过DC-DC变换器(隔离变换器)变为Udc2；
S5、直流电压Udc2经过两个交错并联的降压电路(buck电路)将输入电压变为符合电动汽车充电标准的直流电压，例如48V。
本发明第一电路1的整流电路采用三相全桥整流器，用于实现交流电向直流电转换，交流侧还可设置有滤波电感Lf构成的滤波电路，滤除系统中的谐波，从而提高功率因数。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何属于本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (7)

1.一种多端口新能源电动汽车充电电路，其特征在于：包括包括第一电路、第二电路、第三电路及第四电路；所述第一电路包括依次串接的交流输入端、线路电感L g、降压变压器N、滤波电感L f及三相全桥整流器，交流输入端作为第一输入端口用于接入电网电压源U g，电网电压源U g通过线路电感L g与降压变压器N相连，将降压后的交流电压输入三相全桥整流器，得到直流电压U dc1；所述第二电路为全桥电路，包括交错并联的前boost电路和后boost电路，用于接入外接输入电压U in，外接输入电压U in经过交错并联的双boost电路升压后变为直流电压U dc1，所述第三电路为隔离DC-DC降压变换器，用于将直流电压U dc1降低为U dc2输入给第四电路，所述第四电路为双buck电路，包括前buck电路和后buck电路，输入电压U dc2经过交错并联的双buck电路降压后变为符合电动汽车充电标准的直流电压；所述第二电路中的前boost电路包括开关管S7、开关管S8构成的前桥臂和电感L b1，后boost电路包括开关管S9、开关管S10 构成的后桥臂和电感L b2，两个boost电路交错并联运行，相位差180°, 电感L b1和电感L b2的一端的连接点作为第二输入端口接入外接输入电压U in。
2.如权利要求1所述的多端口新能源电动汽车充电电路，其特征在于：所述三相全桥整流器由6个开关管S1-S6组成三个桥臂，其中开关管S1、开关管S3、开关管S5为共阴极组，开关管S2、开关管S4、开关管S6为共阳极组。
3.如权利要求1所述的多端口新能源电动汽车充电电路，其特征在于：每个开关管S7、S8、 S9、S10由场效应管、续流二极管和谐振电容组成，场效应管的漏极、续流二极管的负极和电容的一端相连构成开关管的输入端，场效应管的源极、续流二极管的正极和电容的另一端相连构成开关管的输出端，开关管S7输出端和开关管S8的输入端的连接点通过电感L b1与第二输入端口连接，开关管S9输出端和开关管S10的输入端的连接点通过电感L b2与第二输入端口连接。
4.如权利要求3所述的多端口新能源电动汽车充电电路，其特征在于：所述第三电路包括前级全桥电路、后级全桥电路、电感L和脉冲变压器，前级全桥电路、后级全桥电路之间通过电感L和脉冲变压器，前级全桥电路与所述第二电路中交错并联运行的boost电路共用开关管S7、S8、 S9、S10。
5.如权利要求4所述的多端口新能源电动汽车充电电路，其特征在于：前级全桥电路中的开关管S7输出端和开关管S8的输入端的连接点与电感L的一端连接，电感L的另一端与脉冲变压器初级的一端连接，前级全桥电路中开关管S9输出端和开关管S10的输入端的连接点与电感L的另一端与脉冲变压器初级的另一端连接，脉冲变压器的次级与后级全桥电路的输入端连接。
6.如权利要求1所述的多端口新能源电动汽车充电电路，其特征在于：所述第四电路中的前buck电路包括开关管S11、S12与电感L b3，后buck电路包括开关管S13、S14与电感L b4，两个buck电力交错并联运行，相位差180°。
7.如权利要求1所述的多端口新能源电动汽车充电电路，其特征在于：所述符合电动汽车充电标准的直流电压为48V。
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