CN104518551A - 能电驱动的车辆的充电站 - Google Patents
能电驱动的车辆的充电站 Download PDFInfo
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Abstract
本发明涉及一种用于能电驱动的车辆(30)的充电站(10),具有用于电源的接口,逆变器以及用于能电驱动的车辆(30)的能量技术上的无线耦合的、连接在逆变器上的电子线圈(L1),其中该逆变器设置用于,电子线圈(L1)在谐振工作模式下施加有交流电压。依据本发明,电子线圈(L1)通过具有能调节的无源电子蓄能器(C1)的补偿电路(12)连接在逆变器上,该补偿电路(12)设计用于,借助能调节的无源电子蓄能器(C1)来调节交流电压的频率。
Description
技术领域
本发明涉及一种用于能电驱动的车辆的充电站,具有用于电源的接口,逆变器以及用于能电驱动的车辆的能量技术上的无线耦合的、连接在逆变器上的电子线圈,其中该逆变器设置用于,电子线圈在谐振工作模式下施加有交流电压。此外,本发明涉及一种用于运行能电驱动的车辆的充电站的方法,其中该充电站从连接在充电站上的电源获得电能,并且在谐振工作模式下借助逆变器和连接在逆变器上的电子线圈产生交流电压,借助该交流电压,电子线圈提供用于能电驱动的车辆的能量技术上的无线耦合的磁交变场。最后本发明涉及一种包括用于充电站的计算单元的程序的计算机程序产品。
背景技术
用于借助磁交变场对能量进行无线传输的一般类型的充电站以及用于运行充电站的方法在原理上是已知的,因此这里无需特殊的书面证明。一般类型的充电站的作用在于,在充电过程中为能电驱动的车辆供能,因此能电驱动的车辆才能实现其预定的功能。能电驱动的车辆需要行驶所需的能量。
能量由充电站的磁交变场提供,该充电站自身与电源,例如公共供电网、发电机、电池和/或诸如此类的相连接。充电站在接收电源的电能时产生磁交变场。能电驱动的车辆借助适当的电子线圈获取所述磁交变场,提取该能量并且在车辆侧提供电能,特别是为车辆的电蓄能器和/或车辆驱动设备的电机提供电能。
一种将能量从充电站向车辆的充电装置输送的可行性方案为,借助车辆与充电站之间的电缆建立作为能量耦合的电连接。除此之外已知的是,根据另一种可行性方案建立能量技术上的无线耦合,该方案避免了借助电缆的高成本的机械连接。为了实现该目的,一般来说在充电站侧和车辆侧分别设置具有电子线圈的线圈电路,在充电过程中该线圈电路大致彼此相对地布置,并且利用磁交变场实现能量技术耦合。举例来说这种结构由KR 10 2012 0 016 521 A已知。
在借助磁交变场传输能量、也称为感应式能量传输的系统中,通过距离和/或偏移的变化而明显地改变所涉及到的线圈电路的电感率。在已知的系统中这会导致工作频率、即磁交变场的频率的明显改变。如果线圈电路、尤其是电子线圈的参数发生改变,超过了比较值,这导致了效率降低,因此不能再传输预定的额定功率。
一种能够对工作频率进行调节的可行性方案,基于变容二极管的使用,能够实现对频率的调整。在进行感应式能量传输的系统中该频率调整类型的应用,例如为了对能电驱动的车辆的蓄能器进行充电,设计成本高。其仅能得到较小的调整区间。除此之外,由于预定工作模式下所形成的电压及所要传输的功率,需要变容二极管的成本较高的串联电路和并联电路。为了抵消在预定工作模式下所产生的工作频率的变化,需要相对更高的电路成本。
感应式能量传输具有的缺点为,可传输的功率和效率与充电站与能电驱动的车辆之间的空气间隙及偏移区域有关。因此在给定的系统布置中,仅在狭窄的空气间隙区域及狭窄的负载范围和偏移范围内才能实现令人满意的预定工作。在此只有通过改变工作频率才能调整所传输的功率。然而由于规范的限制和规定,该方法的使用受到严格的限制。
因此在现有技术条件下,为了补偿而设置为,在整流器与电子线圈之间设计补偿电路,该补偿电路借助电容器能够对无功电压补偿。这既可以设置在初级侧也可以设置在次级侧。实际运行表明,通过常规的基于电容器的补偿电路不能在所有工作状态下实现有效的补偿。
在感应式能量传输、即在利用磁变频场进行能量传输时,逆变器的工作频率、即交流电压的频率强烈依赖于充电时在充电站的电子线圈与能电驱动的车辆的电子线圈之间形成的空气间隙,及两个电子线圈相对彼此可能存在的偏移区域。然而,通过规范规定严格限制了工作频率的变化。
发明内容
由此本发明的目的为,对由充电站和能电驱动的车辆在充电时所构成的系统进行优化,以使得可以降低工作频率对空气间隙和偏移区域的相关性。
本发明提出一种以独立权利要求1为依据的充电站作为解决方案。除此之,外本发明提出一种以另外的独立权利要求7为依据的用于充电站运行的方法。最后本发明还提出一种以另外的权利要求9为依据的计算机程序产品。本发明的其他有利的设计方案由附属权利要求所述的特征和特性给出。
本发明从设备方面特别提出,电子线圈通过具有能调节的无源电子蓄能器的补偿电路与逆变器相连接,其补偿电路设置用于,借助能调节的无源电子蓄能器调整交流电压的频率。
相应地,本发明从方法方面特别提出,电子线圈通过具有能调节的无源电子蓄能器的补偿电路在逆变器上运行,并且借助补偿电路调节交流电压的频率。
通过该发明可以实现,通常在充电站侧给出交流电压、即工作电压的频率,并且仅为了调节性为充电站供电。由此总的来说,可以实现简化的控制和调节,通过这可以在工作频率下维持规范规定。通过本发明可以实现,在充电时将能电驱动的车辆对工作频率的作用进行退耦,因此能电驱动的车辆对工作频率的影响显著减小,甚至可以完全抑制。在此本发明利用的知识为,充电站侧的电子线圈的电感率明显高于设置在车辆侧的、为了建立以感应式能量传输为目的的能量技术上的无线耦合的电子线圈的电感率。结果表明,当充电站侧的电子线圈与车辆侧的电子线圈的电感率比至少为约10:1时,可以实现关于工作频率的良好的耦合。优选地,充电站侧的电子线圈与车辆侧的电子线圈的耦合因数位于百分之50以下。
本发明考虑到,在充电站侧带有电子线圈的逆变器运行在谐振工作模式中。亦即,电子线圈产生的磁交变场的特性明显影响了工作频率。为了抵消这种影响,在充电站侧设置具有无源电子蓄能器的补偿电路,由此可以减小对工作频率的影响。为了实现该目的,将所述无源电子蓄能器设计为能调节的,因此可以根据需要对其进行调整,从而将工作频率维持在预定的频率段内,特别地该频率段由规范规定给出。与现有技术条件的要求不同,依据本发明不再需要电感式能量传输系统运行在对小空气间隙和非常小的偏移公差下并且此外也不需要运行在恒定的功率传输下。通过该发明可以在此实现明显的改善。
在本发明范畴内,感应式能量传输或能量技术上的无线耦合是一种以实现能量的传输为目的的耦合,其可以实现,至少单向地将能量从能量源向能量汇点传输。能量源可以为例如公共的供电网、发电机、太阳能电池、燃料电池、电池、和/或诸如此类的。能量汇点可以为例如能电驱动的车辆的驱动设备,尤其是驱动设备的电机和/或驱动设备的电蓄能器,例如蓄电池或诸如此类的。也可以设置双向的能量传输,即能量传输可以在两个方向上改变。此外充电站要实现的目的为,将能量传输至能电驱动的车辆上,为了实现该目的,充电站从与之相连接的电源获得电能。
在本发明范畴内,能量技术上的无线耦合或感应式能量传输指的是,无需在充电站与能电驱动的车辆之间设置产生电动耦合的机械连接。特别地可以避免借助电缆建立电连接。作为替代地,主要单独由能量场,优选地为磁交变场实现能量技术耦合。
因此充电站设置用于来产生相应的能量场,尤其是磁交变场。在车辆侧相应地设置为,可以获得这种能量场或磁交变场,并且由此获得用于能电驱动的车辆的预定的运行的能量。借助车辆的充电装置,可以将借助能量场、尤其是磁交变场输入的能量转换为电能,为了车辆的预定运行模式,该电能优选地存储在车辆的蓄能器内。为了该目的,充电装置能够具有整流器,该整流器将借助线圈提取了磁交变场的和输给整流器的电能转换为适合于车辆的电能,例如整流、电压转换或诸如此类的转换。除此之外,可以直接地将能量输入给车辆的驱动设备的电机。因此,能量技术耦合主要作用在于传输能量而不是传输信息。相应地,通过与无线通信连接的对比,陈列了本发明的、对于相对较高的功率性能的执行方法。
用于能量技术上的无线耦合、尤其是磁交变场的主要元件是电子线圈,期有时也可以由多个电子线圈构成,该电子线圈用来在充电站侧产生磁交变场,并且在车辆侧磁交变场遍布于该线圈,并且在车辆侧在其相应的接口提供电能。相应地,在充电站侧电子线圈施加有引起交流电的交变电压,因此该电子线圈提供了磁交变场,该磁交变场可以提供能量。在充电过程中,充电站的电子线圈与能电驱动的车辆的电子线圈通过该磁交变场相耦合。
一般来说,线圈具有带有多个电导体线匝的绕组,其中绕组一般包括或包围着铁磁体,该铁磁体通常由铁氧体构成。借助该铁磁体,可以以期望的方式传导磁通量,因此由于充电站与能电驱动的车辆的线圈电路之间的磁交变场,可以增强能量技术耦合的效果。
构成线匝的电子线圈的电导体通常设计为所谓的高频绞合线,即其由多个彼此电绝缘的单个导体或金属线组成,它们相应地结合为导体。由此可以实现,在频率应用如本发明中降低或基本上避免趋肤效应。为了能够改善高频绞合线的每根金属线内尽可能均匀的电流分布,一般还将每根导线都设置为捻合式的。捻合也可以包括,导线束由确定数目的单根导线构成,这些单根导线本身为捻合式的,且其中这些构成导体的导线束同样为捻合式的。
无源电子蓄能器的特征在于,即其基本上不产生和/或消耗电能。优选地,其是像感应器那样的电子组件,例如线圈、电容器、其组合或诸如此类的。所述无源电子蓄能器的作用在于,以期望预设的方式通过逆变器来影响电子线圈的特性,从而达到工作频率尽可能小的变化。因此其不是原电池,也不是电池或蓄电池。就这方面而言,所述无源电子蓄能器与电蓄能器有区别,电蓄能器可以由蓄电池、电池或诸如此类的构成并且主要作为供电装置、例如能量源和/或能量汇点的一部分。
所述补偿电路优选地用电容器作为无源电子蓄能器。除此之外当然可以设置为,也可以使用一个以上的电容器,尤其是由电容器或由例如与电容器连接的线圈组成的网络。
依据本发明的一个方面提出,所述无源电子蓄能器设计为由多件式组成的,并且如此构造为多件式的无源电子蓄能器中的至少一个可以借助相关的开关元件激活。相应地当然可以设置为,由多件式组成的无源电子蓄能器的相应部分也是可去激活的或可激活与可去激活的。
本发明范畴内的开关元件优选地为可控的电子开关元件,例如继电器、接触器或诸如此类形式的电子机械开关元件或者,作为替代地,可控的电子半导体开关,例如晶体管、晶闸管、其组合回路,尤其是两个晶闸管的反平行回路、两个晶闸管的反串联回路,优选地具有并联的空程二极管、TRIAC、GTO、IGBT、其组合或诸如此类的。优选地,开关元件可以由控制单元控制。优选地,控制单元测定条件,该条件规定了由多件式组成的无源电子蓄能器的相应部分的激活或去激活。为了该目的,控制单元通过传感器检测重要参数,例如变流器、补偿电路、线圈电路或诸如此类的参数。所述参数可以例如为电流、电压、电功率、电压与相应电流的相位差、局部磁场强度、其组合和/或诸如此类的。
当补偿电路具有带有多个无源电子蓄能器的电子网络时被证明是特别有利的。由此可以扩大能量技术耦合的匹配或调整范围。优选地,一些,尤其是所有无源电子蓄能器可以借助至少一个开关元件激活和/或去激活。
优选地,所述补偿电路可以具有带有多个无源电子蓄能器的电子网络,如上面已经阐述的。这使得,可以很灵活地设计该补偿电路并且实现对工作频率的调整。依据另一个设计方案提出,所述无源电子蓄能器由电容器和电容器布置构成。特别地,所述电容器能够与电子线圈以串联方式连接。在这种情况下,补偿电路特别适用于调节工作频率。所述电容器可以例如是可调式电容器,其可以借助调节装置根据其容量值进行调节。事实表明,特别有利地是,电容器由多个并联和/或串联的电容器构成,可以根据需求将其激活或去激活。由此构成了可以不连续调节的总电容器,借助该总电容器可以以轻松的方式实现所期待的调节功能。
事实表明,特别有利地是,补偿电路的电容器或电容器中的一部分或电容器布置可以借助至少一个开关元件来激活或去激活。为了该目的,该开关元件本身可以由半导体开关元件或由包括多个半导体元件的开关单元构成。
依据另一方面所述充电站具有根据通过磁交变场所传输的功率和/或能量传输过程的效率来对补偿电路进行调节的控制装置。因此该控制装置的作用在于,通过对可调的补偿电路产生影响而实现尽可能优化的、优选地预先给定的运行模式。其可以由硬件电路、模拟或数字的计算单元、尤其是基于至少一个运算放大器的计算单元、其组合或诸如此类的构成。
依据一个优化方案,所述开关元件由半导体开关元件或由具有多个半导体元件的开关单元构成。优选地该开关元件设置用于,能够将电流输送至每个电流方向。如上所讨论的,半导体开关元件可以是晶体管、晶闸管或诸如此类的。所述开关单元优选地由至少两个半导体开关元件构成,其以适当地方式相连接,以实现所预定的功能。举例来说,可以设置晶闸管的并联电路,所述晶闸管相对于其导通方向反向地并联,即反并联相连接。作为替代地,除了这种并联电路也可以应用TRIAC,其与单独的晶闸管不同的是,其允许在两个电流方向的可控开关。当开关单元具有两个晶体管时,其可以具有例如两个晶体管的串联电路,其中对双极晶体管来说是发射端彼此电子连接,对MOSFET来说是相应的源极端子彼此电子连接。因此,作为开关单元的开关元件的端口分别由极电极或漏极端子构成。除此之外,对于具有晶体管的开关单元来说可以设置空程二极管。通过开关单元或半导体开关元件可以实现非常易变地、有效地并且快速地控制或执行开关过程。与电机械开关元件相比,由于较小的磨损可以实现更小的损失功率、更高的开关速度和更高的可靠性。
根据本发明的另一方面提出,借助补偿电路,关于频率比较值对交流电压的频率进行调节。相应的可以为工作频率预设频率,并且使充电站、即尤其是与电子线圈和补偿电路相连的逆变器运行,从而使工作频率基本上与比较频率相对应。在此,可以设置相应的调节单元,其可以是充电站的组成部分。特别优选地,将其集成在逆变器的控制器内。借助传感器可以确定谐振运行模式下的工作频率,并且由此生成逆变器的控制信号,因此工作频率根据其值趋于比较频率值。为了该目的,可以另外地设置为,由调节单元对补偿电路、尤其是可控开关元件进行控制,从而能够实现在由比较频率给出的工作频率下的谐振工作模式。由此可以明显地改善对标准规定的维持。
相应地,本发明还包括通用的计算机程序产品,其中当程序由控制装置的计算单元执行时,该产品具有执行以本发明为依据的方法的程序的程序代码段。前述计算机程序产品可以设计为计算机可读的存储介质。除此之外,该程序可以直接加载至计算单元的内部存储器内。因此例如可以实现,将来自网络的程序从数据源、例如服务器中下载并且在计算单元的内部存储器内加载,因此计算机可以执行该程序。
优选地,所述计算机程序包括计算机可读的介质,该介质上可以存储所述程序代码段。这种可读的计算机可读的介质可以为例如存储硬件、光盘、U盘或诸如此类的。
附图说明
其他的优点和特征由下述实施实例的说明结合附图给出。在图示中相同的组件和功能用相同的标号标注。
在附图中:
图1示意性地示出由充电站的一部分及能电驱动的车辆的一部分所构成的系统的电路原理图,该系统用来进行无线感应式能量传输,并且
图2示意性地示出用于调节能电驱动的车辆在充电站进行充电时的工作频率的流程图。
具体实施方式
图1示出了当进行充电时,充电站10的一部分通过磁场20与能电驱动的车辆的原理电路的相应部分的能量技术上的无线耦合的示意性的电路原理图。
在充电站侧设置具有电子线圈L1的线圈结构14,该电子线圈与电阻R1以串联方式相连接。该电阻R1反映出充电站侧结构的电阻损耗。线圈电路14与补偿电路相连接,该补偿电路与线圈电路14串联地与电容器C1相连通。此外,与该串联电路并联地连接电容器Cp1。此外,补偿电路12具有端口16,18,通过该端口该补偿电路与充电站12的未详细示出的逆变器相连接。这里所构成的充电站侧的结构用于产生实现无线能量技术传输的磁交变场20并且运行在谐振工作模式下。亦即,逆变器、补偿电路12和线圈结构14运行,使得工作频率可以利用由此而产生的谐振。
由此电容器C1和Cp1构成了补偿电路12的无源电子蓄能器。从图1未示意出的是,电容器C1设计为可调节的。为了该目的,电容器C1由多个并联连接的电容器组成,其可以由电子半导体开关可选地激活或去激活,其中通过半导体开关对相应的电容器进行接通或断开。
同样未示出的控制单元具有传感器,借助该传感器可以确定谐振工作模式下的谐振频率。同时所述控制单元具有每个半导体开关的控制信号,因此控制单元可以控制单个电容器的开或关。控制单元包括调节单元,借助该调节单元通过相应的半导体开关的开关动作可以将工作频率调节至与比较频率基本一致的频率,该频率也是可预设地调节的。比较频率例如可以由操作者或诸如此类的预设并且优选地选择为,即可以维持标准规定。
此外由图1可以得出,磁场20遍布于能电驱动的车辆的线圈L2。线圈L2为线圈电路34的组件,此外该线圈电路包括与线圈L2串联连接的电阻R2。电阻R2描述了车辆侧的结构的损耗。此外,能电驱动的车辆也包括补偿电路32,该补偿电路与线圈电路34相连接。该补偿电路32包括与线圈电路34串联连接的电容器C2。此外对于该串联电路,补偿电路32还包括并联连接的电容器Cp2。此外,电阻RL与补偿电路连接,即与电容器Cp2并联地连接,该电阻包括能电驱动的车辆的其他电动部件。举例来说,整流器由电阻RL包围,该整流器将线圈L2所提供的电压转换为用于能电驱动的车辆30的合适的电压。此外,电阻RL包括蓄电池以及与蓄电池相连接的、能电驱动的车辆30的驱动设备的电机。
在图1所示的当前的设计方案中,电子线圈L1的电感率的值大约电子线圈L2的电感率的值乘以因数10。此外,两个电子线圈L1、L2之间的耦合因数小于等于50%。由此,在此形成的电感式传输系统仅具有弱耦合。因此,在充电时严格限制了能电驱动的车辆对充电站和在此尤其是对工作频率的反作用,因此基本上在充电站侧工作频率是确定的。由此,通过充电站10的补偿网络12可以保证对工作频率的可靠的调节。由此,可以降低能量传输的功率变化对电子线圈L1和L2之间的空气间隙及偏移的相关性。
由此可以基本维持工作频率的恒定。
本发明的一个方面为,能够实现对能电驱动的车辆对工作频率的反作用尽可能地退耦。
图2在流程图中示出了借助充电站10的补偿电路12的电容器C1来调节工作频率的方法流程。该方法流程从步骤40以方法的开始为启始。接着是步骤42,在该步骤中将电容器C1的值设置为初始值,即在CS1中同样设置CS1start。接下来在步骤44内进行比较测试,该比较测试中测定当前频率fset,将该当前频率与最小频率fmin和最大频率fmax比较。如果频率fset的值位于由频率fmin和fmax所构成的区域内,则方法在步骤54结束。
相反地,如果在步骤46内频率fset大于最大频率fmax,则在步骤48中电容器C1的值、即变量CS1升高一个给定量ΔCS1。该值升高的结果是,工作频率降低。然后该方法在步骤44继续进行比较。
如果在步骤44中确定了,频率fset位于步骤44预设的频率区间之外并且在步骤50中确定了,频率fset小于所述最小频率fmin,则在步骤42中变量CS1会发生相反地改变,即该变量降低一个给定量ΔCS1。然后该方法在步骤44中继续进行并且该随后要调节的频率fset作为此处预设的比较值。
该方法会一直执行,直至频率fset位于由最小频率fmin和最大fmax所构成的区域内。
仅仅为了完整起见而注意到,可以由补偿电路,甚至电容器C2和电容器Cp2对所传输的功率和效率在车辆侧进行调节。
前述实施实例只对本发明进行阐述并不对本发明进行限制。显然可以根据需要由专业人员给出相应的变体,这并不脱离本发明的保护范围。
当然也可以根据需求以任意方式对各个特征进行组合。除此之外,装置特征当然也可以由相应的方法步骤给出,并且反之亦然。
Claims (10)
1.一种用于能电驱动的车辆(30)的充电站(10),具有用于电源的接口,逆变器以及用于所述能电驱动的车辆(30)的能量技术上的无线耦合的、连接在所述逆变器上的电子线圈(L1),其中所述逆变器设置用于,所述电子线圈(L1)在谐振工作模式下施加有交流电压,其特征在于,所述电子线圈(L1)通过具有能调节的无源电子蓄能器(C1)的补偿电路(12)连接在所述逆变器上,所述补偿电路(12)设置用于,借助所述能调节的无源电子蓄能器(C1)来调节所述交流电压的频率。
2.根据权利要求1所述的充电站,其特征在于,所述能调节的无源电子蓄能器(C1)设计为多件式的,并且构造为多件式的所述无源电子蓄能器(C1)的部件中的至少一个能借助相关的开关元件激活。
3.根据权利要求1或2所述的充电站,其特征在于,所述补偿电路(12)具有带有多个无源电子蓄能器的电子网络。
4.根据权利要求1至3中任一项所述的充电站,其特征在于,所述无源电子蓄能器由电容器(C1)或电容器布置构成。
5.根据权利要求2至4中任一项所述的充电站,其特征在于,所述开关元件由半导体开关元件或由包括多个半导体开关元件的开关单元构成。
6.一种用于运行能电驱动的车辆(30)的充电站(10)的方法,所述充电站(10)从连接在所述充电站(10)上的电源获得电能,并且在谐振工作模式下借助逆变器和连接在所述逆变器上的电子线圈(L1)产生交流电压,借助所述电交流电压,所述电子线圈(L1)提供用于所述能电驱动的车辆(30)的能量技术上的无线耦合的磁交变场,其特征在于,所述电子线圈(L1)通过在所述逆变器处的、具有能调节的无源电子蓄能器(C1)的补偿电路(12)运行,并且借助所述补偿电路(12)调节所述交流电压的频率。
7.根据权利要求6所述的方法,其特征在于,根据频率比较值,借助所述补偿电路(12)调节所述交流电压的所述频率。
8.一种计算机程序产品,包括用于充电站(10)的计算单元的程序,其中当所述程序通过计算单元来执行时,所述程序具有用于执行根据权利要求6或7中任一项所述的方法的程序的程序代码段。
9.根据权利要求8所述的计算机程序产品,其特征在于,所述计算机程序产品包括能机读的介质,所述能机读的介质上存储了所述程序代码段。
10.根据权利要求8或9所述的计算机程序产品,其特征在于,所述程序能够直接加载到所述计算单元的内部存储器内。
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