CN104022579A - 电力传输*** - Google Patents
电力传输*** Download PDFInfo
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Abstract
本发明涉及电力传输***,该电力传输***包括:电力发送装置,具有电源单元和电力发送电感,该电源单元供给高频电力,该电力发送电感包括磁芯和绕线部分,并且通过互感将来自所述电源单元的高频电力无线地发送到电力接收装置;以及电磁波防漏设备,该电磁波防漏设备包括一个导电回路或以预定间隔布置的多个导电回路。所述电力发送装置被布置在所述回路中。所述回路的卷绕方向不垂直于所述绕线部分的卷绕方向。
Description
技术领域
本文描述的实施例总体涉及电力传输***。
背景技术
已知一种通过无线电力传输来进行电气设备的充电的技术。例如,当电力接收装置将从电力发送装置发送来的电磁波转换为电能时,在电力接收装置侧的电池能够被充电。
然而,在这样的无线电力传输中,当电磁波的一部分泄露到周围区域时,存在电力传输效率降低和周围设备等被影响的问题。
发明内容
本发明目的在于提供一种能够防止在无线电力传输中的电磁波的泄露的电力传输***。
根据本实施方式的电力传输***,包括:电力发送装置,包括电源单元和电力发送电感,该电源单元供给高频电力,该电力发送电感包括磁芯和绕线部分,并且通过互感将来自所述电源单元的高频电力无线地发送到电力接收装置;以及电磁波防漏设备,包括一个导电回路或以预定间隔布置的多个导电回路,其中所述电力发送装置被布置在所述回路中,并且所述回路的卷绕方向不垂直于所述绕线部分的卷绕方向。
根据本实施方式,能够防止在无线电力传输中的电磁波的泄露。
附图说明
图1是使用根据本实施例的电磁波防漏设备的无线电力传输***的块结构图;
图2是应用了无线电力传输***的电动汽车的块结构图;
图3是根据本实施例的电磁波防漏设备的透视图;
图4是示出根据本实施例的电场强度的变化的曲线图;
图5是示出根据本实施例的泄露的电场的减少率的曲线图;
图6是示出根据本实施例的磁场强度的变化的曲线图;
图7是示出根据本实施例的泄露的磁场的减少率的曲线图;
图8A和8B是示出根据比较例的电场强度分布的例子的示意图;
图9A和9B是示出根据比较例的磁场强度分布的例子的示意图;
图10A和10B是示出根据本实施例的电场强度分布的例子的图;
图11A和11B是示出根据本实施例的磁场强度分布的例子的示意图;以及
图12是根据变形例的电磁波防漏设备的透视图。
具体实施方式
在一个实施例中,电力传输***包括:电力发送装置,该电力发送装置具有电源单元以及电力发送电感,该电源单元供给高频电力,该电力发送电感包括磁芯和绕线部分,并且通过互感将高频电力从电源单元无线地传输到电力接收装置;以及电磁波防漏设备,该电磁波防漏设备包括一个导电回路或以预定间隔布置的多个导电回路。电力发送装置被布置在回路中。回路的卷绕方向不垂直于绕线部分的卷绕方向。
以下,将参照附图对实施例进行说明。
图1示出根据本发明的实施例的使用电磁波防漏设备的无线电力传输***的块结构。无线电力传输***包括电力发送装置1和电力接收装置2,高频电力被从电力发送装置1无线地发送到电力接收装置2。电力接收装置2将发送来的高频电力供给至电气设备的负载28。电力接收装置2可以安装于电气设备内部,也可以安装为与电气设备一体,或可以固定于电气设备主体的外部。例如,电气设备是移动终端或者电动汽车,而负载28是可充电电池。
电力发送装置1包括:电源单元11,用于将商用电源转换到电力传输用的高频电力(RF电力);控制单元12,用于控制需要的高频电力量并且控制电力发送装置1的各单元;传感器单元13;通信单元14;以及电力发送电感15。
传感器13具有:例如,用于监视电力发送装置1的发热的温度传感器,用于监视进入电力发送电感15和将在下面描述的电力接收电感21之间的异物的热量的温度传感器,用于通过电磁波雷达或超声波雷达来监视异物的传感器,用于检测电力接收电感21的位置的诸如射频识别(RFID)等传感器,以及例如用于检测传输的高频电力的电流表或电压表等用于在电力发送装置1和电力接收装置2之间的无线电力传输的传感器。
通信单元14能够与将在下面描述的电力接收装置2的通信单元27进行通信。通信单元14接收电力接收装置2的电力接收状态或发送电力发送装置1的电力发送状态。
电力发送电感15具有磁芯和绕线部分(未示出)。磁芯由例如铁氧体构成,而绕线部分由铜线构成。电力发送电感15可以是绕线部分缠绕于磁芯的螺线管形式,或者是绕线部分布置于磁芯表面的螺旋形式。
电力接收装置2包括:电力接收电感21,通过与电力发送装置1的电力发送电感15的互感来接收高频电力;电容器单元22,连接到电力接收电感21;整流器23,用于将经由电容器单元22接收的交流电流转换为直流电流;直流-直流转换器24,基于负载28的工作电压来改变电压转换比;控制单元25,用于控制电力接收装置2的各个单元;传感器26;以及通信单元27。当由电力发送装置1侧控制接收的高频电力时,能够省略直流-直流转换器24。
电力接收电感21具有磁芯和绕线部分(未示出)。磁芯由例如铁氧体构成,而绕线部分由铜线构成。电力接收电感21具有与电力发送电感15相似的结构,因此可以是绕线部分缠绕于磁芯的螺线管形式,或者是绕线部分布置于磁芯表面的螺旋形式。
传感器26具有:例如,用于监视电力接收装置2的发热的温度传感器,用于监视进入电力接收电感21和电力发送电感15之间的异物的热量的温度传感器,用于通过电磁波雷达或超声波雷达来监视异物的传感器,用于检测电力发送电感15的位置的诸如射频识别(RFID)等传感器,以及例如用于检测接收的高频电力的电流表或电压表等用于在电力发送装置1和电力接收装置2之间的无线电力传输的传感器。通信单元27能够与电力发送装置1的通信单元14进行通信。通信单元27发送电力接收装置2的电力接收状态或接收电力发送装置1的电力发送状态。
控制单元25基于通过通信单元27和电力发送装置1之间的通信获取的信息或传感器26的检测结果来控制接收的高频电力(向负载28供给的高频电力)。
图2示出了图1中所示的无线电力传输***被应用于电动汽车30的情况的例子。电力接收装置2被安装在作为电气设备的电动汽车30中。高频电力经由互感被从连接到电源单元11的电力发送电感15向电力接收电感21传输。然后,对应于负载28的电池34经由电力控制设备32(整流器23、直流-直流转换器24及控制单元25等)被充电。在图2中,为描述的方便,电力发送装置1的控制单元12、传感器单元13和通信单元14,以及电力接收装置2的传感器单元26和通信单元27的图示被省略。
如图2中所示,电力发送电感15被安装于地表或地中。电动汽车30被以电力接收电感21位于电力发送电感15上方的方式停放。
图3示出根据本实施例的电磁波防漏设备100的示意性结构。电磁波防漏设备100包括以预定间隔布置的多个导电回路(环线,loopline)110。回路110由例如铜构成。如图3中所示,图1中所示的无线电力传输***被布置在由回路110环绕的区域中。例如,安装回路110和具有电力发送装置1的电力传输***。具有电力接收装置2的电动汽车(见图2)被沿图3中的x轴方向移动,经由电磁波防漏设备100的开口部分120进入电磁波防漏设备100,并被停放在电力接收装置2位于电力发送装置1上方的地方。
此处,回路110的卷绕方向不垂直于电力发送装置1的电力发送电感15的绕线的卷绕方向或电力接收装置2的电力接收电感21的绕线的卷绕方向。通过设置有此卷绕方向回路110,当在电力发送电感15和电力接收电感21之间进行电力传输时,感应电流流向回路110,而泄露的电磁场被消除。
不垂直于电力发送电感15的绕线的卷绕方向或电力接收电感21的绕线的卷绕方向的回路110的卷绕方向,例如,与电力发送电感15的绕线或电力接收电感21的绕线是相同的卷绕方向。当回路110的卷绕方向被设置为此方向时,能够取得消除泄露的电磁场的最好效果。
图4示出在安装了电磁波防漏设备100的情况和未安装设备100的情况下的x轴方向和y轴方向上的电场强度的变化。x轴方向和y轴方向分别对应于图3中所示的x轴方向和y轴方向。此处,电磁波防漏设备100具有以50cm间隔在x轴方向布置的五个回路110。即,回路110两端之间的距离(电磁波防漏设备100在x轴方向的尺寸)是2m。另外,电磁波防漏设备100在y轴方向的尺寸(回路110在y轴方向的尺寸)被设置为2m。另外,电力发送装置1和电力接收装置2被布置在电磁波防漏设备100的中心。图4中的横坐标上的距离基于电力发送装置1和电力接收装置2的位置。
另外,图5示出了由于安装电磁波防漏设备100而在x轴方向和y轴方向的泄露的电场的减少率。
根据图4和图5,发现通过电磁波防漏设备100,在x轴方向和y轴方向的泄露的电场被减少。特别是,发现在y轴方向,泄露的电场大大地减少。
图6示出在安装电磁波防漏设备100的情况和未安装设备100的情况下的x轴方向和y轴方向的磁场强度的变化。
另外,图7示出由于安装电磁波防漏设备100而在x轴方向和y轴方向的泄露的磁场的减少率。
根据图6和图7,发现通过电磁波防漏设备100,在x轴方向和y轴方向的泄露的磁场被减少。特别是,发现在y轴方向泄露的磁场大大减少。
图8A和8B分别地示出在未安装电磁波防漏设备100情况下的在yz平面和zx平面中的电场强度分布。另外,图9A和9B分别地示出在未安装电磁波防漏设备100情况下的在yz平面和zx平面中的磁场强度分布。
另一方面,图10A和10B分别地示出在安装了电磁波防漏设备100情况下的在yz平面和zx平面中的电场强度分布。另外,图11A和11B分别地示出在安装了电磁波防漏设备100情况下的在yz平面和zx平面中的磁场强度分布。
根据图8到11B,发现通过电磁波防漏设备100,泄露的电场和泄露的磁场不仅在x轴方向和y轴方向,而且在z轴方向也被减少。
因为需要用于消除泄露的电磁场的感应电流流进回路110,所以回路110的直径大于或等于表面厚度。表面厚度能够根据以下公式获得。在公式中,ω是角频率,μ是磁导率,而σ是导电率。
像这样,根据本实施例,通过具有与电力发送电感15或电力接收电感21在相同绕线方向的多个回路的简单结构的电磁波防漏设备100,能够防止在无线电力传输中的电磁波的泄露。
电磁波防漏设备100可以被用绝缘树脂片等覆盖。用此配置,当电动汽车等通过无线电力传输被充电时,该汽车能够防雨水等。另外,能够防止从电磁波防漏设备100的外面与感应电流流入的回路110的直接接触。另外,可以用绝缘体来覆盖各个回路110。
在上述实施例中,电磁波防漏设备100由多个回路110构成。然而,如图12中所示,可以提供导体板130,并且可以通过将导线140的两端连接到此导体板130来构成回路。导体板130是例如铝板。在此情况下,由导体板130和导线140构成的回路的卷绕方向也不垂直于电力发送电感15和电力接收电感21的卷绕方向。在图12中,电磁波防漏设备100的底面是导体板130,但是其侧面或上表面也可以是导体板130。
在上述实施例中,电磁波防漏设备100包括多个导电回路110。但回路110可以是一个。
在上述实施例中,鉴于易于在地面上等安装矩形回路,所以回路110的外形是矩形(大致矩形)。然而,回路110可以有其它配置,例如半圆形。如果回路110是半圆形,则通过将回路110的直线部分放置在电磁波防漏设备100的底部,能够容易地将回路110安装在地面上等。
另外,可以设置用于检测异物(例如人或鸟)进入电磁波防漏设备100内的传感器。此传感器被直接连接到控制单元12,或经由电力发送装置1的通信单元14连接到控制单元12。当传感器检测到异物的进入时,控制单元12停止电力传输。电力发送装置1的传感器单元13可以检测异物进入电磁波防漏设备100中。
尽管已经描述了特定实施例,但这些实施例仅仅以示例的方式呈现,且不旨在限制本发明的范围。实际上,本文描述的新颖的方法和***可以用各种其它方式体现;此外,不脱离本发明的精神,可以作出各种对本文描述的方法和***的方式的省略、替代和变化。所附的权利要求及其等同物旨在覆盖此类会落入本发明范围和精神的形式或修改。
Claims (7)
1.一种电力传输***,包括:
电力发送装置,包括电源单元和电力发送电感,该电源单元供给高频电力,该电力发送电感包括磁芯和绕线部分,并且通过互感将来自所述电源单元的高频电力无线地发送到电力接收装置;以及
电磁波防漏设备,包括一个导电回路或以预定间隔布置的多个导电回路,
其中所述电力发送装置被布置在所述回路中,并且
所述回路的卷绕方向不垂直于所述绕线部分的卷绕方向。
2.根据权利要求1所述的电力传输***,其中所述回路被缠绕在与所述绕线部分相同的方向。
3.根据权利要求1所述的电力传输***,其中所述多个回路包括导体板和多根导线,并且所述导线的两端被连接到所述导体板。
4.根据权利要求1所述的电力传输***,还包括检测异物进入所述电磁波防漏设备内的传感器,
其中当所述传感器检测到异物的进入时,所述电力发送装置停止发送所述高频电力。
5.根据权利要求1所述的电力传输***,其中各个回路被用绝缘体覆盖。
6.根据权利要求1所述的电力传输***,还包括覆盖所述多个回路的绝缘片。
7.根据权利要求1所述的电力传输***,其中所述回路的外形是矩形或半圆形。
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