CN102027683A - 在无线电力传递中具有负电阻的方法和设备 - Google Patents

在无线电力传递中具有负电阻的方法和设备 Download PDF

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CN102027683A
CN102027683A CN2009801168295A CN200980116829A CN102027683A CN 102027683 A CN102027683 A CN 102027683A CN 2009801168295 A CN2009801168295 A CN 2009801168295A CN 200980116829 A CN200980116829 A CN 200980116829A CN 102027683 A CN102027683 A CN 102027683A
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reception antenna
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阿里礼萨·霍尔木兹·穆罕默点
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    • G06K7/0008General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
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    • G06COMPUTING; CALCULATING OR COUNTING
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
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    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
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    • G06K7/10178Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field
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    • H01Q1/2208Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
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    • H01ELECTRIC ELEMENTS
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    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
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    • H02J50/50Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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    • H02J7/00034Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

示范性实施例针对于无线电力传递。天线电路使用负电阻来抵销来自电路中的其它元件的电阻。所述天线电路包括:天线,其用于在谐振频率处与近场辐射耦合;以及电容元件,其与接收天线串联连接。所述天线电路还包括与所述电容元件串联连接的负电阻产生器。在接收天线和可能转发器天线的情况下,负载与所述负电阻产生器串联连接。在所述天线电路在所述谐振频率附近振荡时,所述负载可汲取来自所述近场辐射的电力。在发射天线的情况下,信号产生器与所述天线串联耦合,以用于将信号电力施加到所述天线电路,以在所述谐振频率处产生电磁场,从而在近场内形成耦合模式区。

Description

在无线电力传递中具有负电阻的方法和设备
依据35 U.S.C.§119主张优先权
本申请案依据35 U.S.C.§119(e)主张以下申请案的优先权:
在2008年6月11日申请的题为“经由接收天线阻抗调制的反向链路信令(REVERSE LINK SIGNALING VIA RECEIVE ANTENNA IMPEDANCEMODULATION)”的美国临时专利申请案61/060,735;
在2008年6月11日申请的题为“无线电力环境中的信令充电(SIGNALINGCHARGING IN WIRELESS POWER ENVIRONMENT)”的美国临时专利申请案61/060,738;
在2008年5月13日申请的题为“用于无线电力传递的自适应调谐机制(ADAPTIVETUNING MECHANISM FOR WIRELESS POWER TRANSFER)”的美国临时专利申请案61/053,008;
在2008年5月13日申请的题为“用于无线电力充电系统的有效电力管理方案(EFFICIENT POWER MANAGEMENT SCHEME FOR WIRELES S POWER CHARGINGSYSTEMS)”的美国临时专利申请案61/053,010;
在2008年6月11日申请的题为“用于无线充电系统的发射电力控制(TRANSMITPOWER CONTROL FOR A WIRELESS CHARGING SYSTEM)”的美国临时专利申请案61/060,741;
在2008年5月13日申请的题为“用于增强无线电力传递的转发器(REPEATERSFOR ENHANCEMENT OF WIRELESS POWER TRANSFER)”的美国临时专利申请案61/053,000;
在2008年5月13日申请的题为“用于电器和设备的无线电力传递(WIRELESSPOWER TRANSFER FOR APPLIANCES AND EQUIPMENTS)”的美国临时专利申请案61/053,004;
在2008年7月16日申请的题为“使用负电阻的无线电力传递(WIRELESS POWERTRANSFER USING NEGATIVE RESISTANCE)”的美国临时专利申请案61/081,332;
在2008年5月13日申请的题为“用于无线电力传递的嵌入式接收天线(EMBEDDED RECEIVE ANTENNA FOR WIRELESS POWER TRANSFER)”的美国临时专利申请案61/053,012;以及
在2008年5月13日申请的题为“平面大面积无线充电系统(PLANAR LARGEAREAWIRELESS CHARGING SYSTEM)”的美国临时专利申请案61/053,015。
背景技术
通常,每一电池供电装置(例如,无线电子装置)需要其自身的充电器和电力源,其通常为交流(AC)电源插座。在许多装置需要充电时,此种有线配置变得难以使用。
正开发在发射器与耦合到待充电的电子装置的接收器之间使用空中或无线电力发射的方法。此些方法通常落在两个类别中。一个类别是基于发射天线与待充电的装置上的接收天线之间的平面波辐射(还被称作远场辐射)的耦合。接收天线收集所辐射的电力且对其进行整流以供对电池充电。天线通常具有谐振长度以便改进耦合效率。此方法的缺点为电力耦合随着天线之间的距离增加而快速衰退。因此,在合理长度(例如,小于1米到2米)内充电变得困难。另外,由于发射系统辐射平面波,所以如果未经由滤波来进行适当控制,则无意的辐射可干扰其它系统。
无线能量发射技术的其它方法是基于在嵌入于(例如)“充电”垫或表面中的发射天线与嵌入于待充电的主机电子装置中的接收天线(加上整流电路)之间的电感性耦合。此种方法具有以下缺点,即,发射天线与接收天线之间的间隔必须非常接近(例如,在千分之几米内)。尽管此种方法确实具有对相同区域中的多个装置同时充电的能力,但此区域通常非常小且要求用户将所述装置准确地定位到特定区域。因此,需要提供一种适应发射天线和接收天线的灵活放置和定向的无线充电布置。
在无线电力发射的情况下,需要用于调整天线的操作特性以适应不同环境并优化电力传递特性的系统和方法。
附图说明
图1展示无线电力传递系统的简化框图。
图2展示无线电力传递系统的简化示意图。
图3展示用于本发明的示范性实施例中的环形天线的示意图。
图4展示指示发射天线与接收天线之间的耦合强度的模拟结果。
图5A和图5B展示根据本发明的示范性实施例的用于发射天线和接收天线的环形天线的布局。
图6展示指示与图5A和图5B中所说明的正方形和圆形发射天线的各种周长大小有关的在发射天线与接收天线之间的耦合强度的模拟结果。
图7展示指示与图5A和图5B中所说明的正方形和圆形发射天线的各种表面积有关的在发射天线与接收天线之间的耦合强度的模拟结果。
图8展示接收天线相对于发射天线的各种放置点以说明在共面和同轴放置下的耦合强度。
图9展示指示在发射天线与接收天线之间的各种距离下同轴放置的耦合强度的模拟结果。
图10为根据本发明的示范性实施例的发射器的简化框图。
图11为根据本发明的示范性实施例的接收器的简化框图。
图12展示用于在发射器与接收器之间进行消息接发的发射电路的一部分的简化示意图。
图13A到图13C展示在各种状态下的接收电路的一部分的简化示意图,以说明接收器与发射器之间的消息接发。
图14A到图14C展示在各种状态下的替代性接收电路的一部分的简化示意图,以说明接收器与发射器之间的消息接发。
图15A到图15C为说明用于发射器与接收器之间的通信的消息接发协议的时序图。
图16A到图16D为说明用于在发射器与接收器之间发射电力的信标电力模式的简化框图。
图17A说明大发射天线,其中较小转发器天线与所述发射天线共面和同轴地安置。
图17B说明发射天线,其中较大转发器天线相对于所述发射天线同轴放置。
图18A说明大发射天线,其中三个不同的较小转发器天线与所述发射天线共面地安置且安置于所述发射天线的周边内。
图18B说明大发射天线,其中较小转发器天线相对于发射天线有偏移地同轴放置和有偏移地共面放置。
图19展示指示发射天线、转发器天线和接收天线之间的耦合强度的模拟结果。
图20A展示指示在不具有转发器天线的情况下在发射天线与接收天线之间的耦合强度的模拟结果。
图20B展示指示在具有转发器天线的情况下在发射天线与接收天线之间的耦合强度的模拟结果。
图21说明构成负电阻转换器的具有正和负反馈的示范性运算放大器。
图22A到图22C说明分别包括用于发射天线、转发器天线和接收器天线的负电阻的示范性天线电路。
具体实施方式
词语“示范性”在本文中用以指“充当实例、例子或说明”。本文中描述为“示范性”的任何实施例不必理解为比其它实施例优选或有利。
在下文结合附图陈述的详细描述意欲作为对本发明的示范性实施例的描述且无意表示可实践本发明的仅有实施例。在整个此描述中所使用的术语“示范性”指“充当实例、例子或说明”且应没有必要理解为比其它示范性实施例优选或有利。所述详细描述包括特定细节以用于提供对本发明的示范性实施例的彻底理解的目的。所属领域的技术人员将明白,可在无这些特定细节的情况下实践本发明的示范性实施例。在一些例子中,以框图形式来展示众所周知的结构和装置以便避免使本文所呈现的示范性实施例的新颖性模糊不清。
词语“无线电力”在本文中用以指与在不使用物理电磁导体的情况下从发射器发射到接收器的电场、磁场、电磁场或其它相关联的任何形式的能量。
图1说明根据本发明的各种示范性实施例的无线发射或充电系统100。将输入电力102提供到发射器104以供产生用于提供能量传递的辐射场106。接收器108耦合到辐射场106且产生输出电力110以供耦合到输出电力110的装置(未图示)存储或消耗。发射器104与接收器108两者相隔距离112。在一个示范性实施例中,根据相互谐振关系来配置发射器104和接收器108,且当接收器108位于辐射场106的“近场”中时,在接收器108的谐振频率与发射器104的谐振频率完全相同时,发射器104与接收器108之间的发射损失是最小的。
发射器104进一步包括用于提供用于能量发射的装置的发射天线114,且接收器108进一步包括用于提供用于能量接收的装置的接收天线118。根据应用和将与其相关联的装置来设计发射天线和接收天线的大小。如所陈述,通过将发射天线的近场中的能量的大部分耦合到接收天线而非以电磁波形式将大多数能量传播到远场来进行有效能量传递。当在此近场中时,可在发射天线114与接收天线118之间形成耦合模式。在天线114和118周围的可发生此近场耦合的区域在本文中被称作耦合模式区。
图2展示无线电力传递系统的简化示意图。发射器104包括振荡器122、功率放大器124以及滤波和匹配电路126。所述振荡器经配置以在所要频率下产生,可响应于调整信号123来调整所述所要频率。可由功率放大器124以响应于控制信号125的放大量来放大振荡器信号。可包括滤波和匹配电路126以滤出谐波或其它不想要的频率且将发射器104的阻抗与发射天线114匹配。
接收器可包括匹配电路132以及整流和切换电路以产生DC电力输出,以对电池136(如图2所示)充电或向耦合到接收器的装置(未图示)供电。可包括匹配电路132以将接收器108的阻抗与接收天线118匹配。
如图3中所说明,示范性实施例中所使用的天线可经配置为“环形”天线150,其在本文中还可被称作“磁性”天线。环形天线可经配置以包括空气芯或实体芯(例如,铁氧体芯)。空气芯环形天线可更能容忍放置于所述芯附近的外来实体装置。此外,空气芯环形天线允许其它元件放置于芯区域内。另外,空气芯环形可更易于使得能够将接收天线118(图2)放置于发射天线114(图2)的平面内,在所述平面内,发射天线114(图2)的耦合模式区可更强大。
如所陈述,在发射器104与接收器108之间的谐振匹配或近似匹配期间,发生发射器104与接收器108之间的有效能量传递。然而,即使当发射器104与接收器108之间的谐振不匹配时,还可在较低效率下传递能量。通过将来自发射天线的近场的能量耦合到驻留于形成了此近场的邻域中的接收天线而非将能量从发射天线传播到自由空间中来进行能量传递。
环形或磁性天线的谐振频率是基于电感和电容。环形天线中的电感通常仅为由所述环形产生的电感,而通常将电容添加到环形天线的电感以在所要谐振频率下产生谐振结构。作为非限制性实例,可将电容器152和电容器154添加到所述天线以创建产生谐振信号156的谐振电路。因此,对于较大直径的环形天线来说,诱发谐振所需的电容的大小随着环形的直径或电感增加而减小。此外,随着环形或磁性天线的直径增加,近场的有效能量传递区域增加。当然,其它谐振电路为可能的。作为另一非限制性实例,电容器可并行地放置于环形天线的两个端子之间。另外,所属领域的技术人员将认识到,对于发射天线,谐振信号156可为环形天线150的输入。
本发明的示范性实施例包括在处于彼此的近场中的两个天线之间耦合电力。如所陈述,近场为在天线周围的存在磁场但不可传播或辐射远离所述天线的区域。其通常限于接近所述天线的物理体积的体积。在本发明的示范性实施例中,磁性型天线(例如,单匝环形天线和多匝环形天线)用于发射(Tx)和接收(Rx)天线系统两者,因为与电型天线(例如,小偶极)的电近场相比,磁性型天线的磁近场振幅趋于更高。此允许所述对天线之间的潜在较高耦合。此外,还涵盖“电”天线(例如,偶极和单极)或磁性天线与电天线的组合。
Tx天线可在足够低的频率下和在天线大小足够大的情况下操作,以在显著大于由早先所提及的远场和电感方法允许的距离的距离下实现到小Rx天线的良好耦合(例如,>-4dB)。如果正确地设计Tx天线的大小,则在主机装置上的Rx天线放置于受驱动Tx环形天线的耦合模式区(即,在近场中)内时,可实现高耦合程度(例如,-2到-4dB)。
图4展示指示发射天线与接收天线之间的耦合强度的模拟结果。曲线170和172分别指示对发射天线和接收天线的电力接受的测量。换句话说,在大负数的情况下,存在非常紧密的阻抗匹配,且大多数电力被接受且因此由发射天线辐射。相反,小负数指示许多电力从天线反射回,因为在给定频率下不存在紧密阻抗匹配。在图4中,调谐发射天线和接收天线以使其具有约13.56MHz的谐振频率。
曲线170说明在各个频率处的从发射天线发射的电力量。因此,在对应于约13.528MHz和13.593MHz的点1a和3a处,许多电力被反射且不发射到发射天线外。然而,在对应于约13.56MHz的点2a处,可看到,大量电力被接受且被发射到天线外。
类似地,曲线172说明在各个频率处由接收天线接收的电力量。因此,在对应于约13.528MHz和13.593MHz的点1b和3b处,许多电力被反射且不经由接收天线输送并进入接收器中。然而,在对应于约13.56MHz的点2b处,可看到,大量电力被接收天线接受且输送到接收器中。
曲线174指示在经由发射天线从发射器发送、经由接收天线接收且输送到接收器后在接收器处接收到的电力量。因此,在对应于约13.528MHz和13.593MHz的点1c和3c处,发送到发射器外的许多电力在接收器处为不可用的,因为(1)发射天线拒绝从发射器发送到其的许多电力和(2)发射天线与接收天线之间的耦合随着频率远离谐振频率而效率降低。然而,在对应于约13.56MHz的点2c处,可看到,从发射器发射的大量电力在接收器处为可用的,从而指示发射天线与接收天线之间的高耦合程度。
图5A和图5B展示根据本发明的示范性实施例的用于发射天线和接收天线的环形天线的布局。可以许多不同方式来配置环形天线,其中单个环或多个环具有广泛多种大小。另外,所述环可呈许多不同形状,例如(仅举例)圆形、椭圆形、正方形和矩形。图5A说明大正方形环形发射天线114S和小正方形环形接收天线118,小正方形环形接收天线118与发射天线114S放置于相同平面中且接近发射天线114S的中心。图5B说明大圆形环形发射天线114C和小正方形环形接收天线118′,小正方形环形接收天线118′与发射天线114C放置于相同平面中且接近发射天线114C的中心。正方形环形发射天线114S具有边长“a”,而圆形环形发射天线114C具有直径“Φ”。对于正方形环形来说,可展示存在等效圆形环形,其直径可界定为:Φeq=4a/π。
图6展示指示与图4A和图4B中所说明的正方形和圆形发射天线的各种周长有关的在发射天线与接收天线之间的耦合强度的模拟结果。因此,曲线180展示在圆形环形发射天线114C的各种周长大小下圆形环形发射天线114C与接收天线118之间的耦合强度。类似地,曲线182展示在正方形环形发射天线114S的各种等效周长大小下正方形环形发射天线114S与接收天线118′之间的耦合强度。
图7展示指示与图5A和图5B中所说明的正方形和圆形发射天线的各种表面积有关的在发射天线与接收天线之间的耦合强度的模拟结果。因此,曲线190展示在圆形环形发射天线114C的各种表面积下圆形环形发射天线114C与接收天线118之间的耦合强度。类似地,曲线192展示在正方形环形发射天线114S的各种表面积下正方形环形发射天线114S与接收天线118′之间的耦合强度。
图8展示接收天线相对于发射天线的各种放置点以说明在共面和同轴放置中的耦合强度。如本文所使用,“共面”指发射天线与接收天线具有大体上对准的平面(即,具有指向大体上相同的方向的表面法线)且发射天线与接收天线的平面之间不具有距离(或具有小距离)。如本文所使用,“同轴”指发射天线与接收天线具有大体上对准的平面(即,具有指向大体上相同的方向的表面法线)且所述两个平面之间的距离并非细微的,且此外,发射天线与接收天线的表面法线大体上沿着相同向量展现,或所述两个法线排成梯队。
作为实例,点p1、p2、p3和p7为接收天线相对于发射天线的所有共面放置点。作为另一实例,点p5和p6为接收天线相对于发射天线的同轴放置点。下表展示在图8中所说明的各个放置点(p1到p7)处的耦合强度(S21)和耦合效率(表达为从发射天线发射的到达接收天线的电力的百分比)。
表1
  位置   距平面的距离(cm)  S21效率(%)   效率(TX DC电力入对RX DC电力出)
  p1   0   46.8   28
  p2   0   55.0   36
  p3   0   57.5   35
  p4   2.5   49.0   30
  p5   17.5   24.5   15
  p6   17.5   0.3   0.2
  p7   0   5.9   3.4
如可看到,共面放置点p1、p2和p3均展示相对高的耦合效率。放置点p7也为共面放置点,但在发射环形天线外部。虽然放置点p7不具有高耦合效率,但很明显存在一些耦合且耦合模式区延伸超出发射环形天线的周边。
放置点p5与发射天线同轴且展示相当大的耦合效率。放置点p5的耦合效率不如共面放置点的耦合效率高。然而,放置点P5的耦合效率为足够高的,使得可在同轴放置的发射天线与接收天线之间输送相当多的电力。
放置点p4处于发射天线的周长内但在发射天线的平面上方的很小距离处的位置中,其可被称作偏移同轴放置(即,表面法线在大体上相同的方向上但处于不同位置处)或偏移共面(即,表面法线在大体上相同的方向上但平面彼此相对偏移)。从所述表可看到,在偏移距离为2.5cm的情况下,放置点p4仍具有相对良好的耦合效率。
放置点p6说明在发射天线的周长外部且处于发射天线的平面上方相当大距离处的放置点。如可从所述表看到,放置点p7展示发射天线与接收天线之间的很小的耦合效率。
图9展示指示在发射天线与接收天线之间的各种距离处同轴放置的耦合强度的模拟结果。图9的模拟针对处于同轴放置的正方形发射和接收天线,其均具有约1.2米的边且处于10MHz的发射频率下。可看到,在小于约0.5米的距离处,耦合强度保持相当高且均一。
图10为根据本发明的示范性实施例的发射器的简化框图。发射器200包括发射电路202和发射天线204。通常,发射电路202通过提供导致在发射天线204周围产生近场能量的振荡信号来将RF电力提供到发射天线204。举例来说,发射器200可在13.56MHz ISM频带处操作。
示范性发射电路202包括用于将发射电路202的阻抗(例如,50欧姆)匹配到发射天线204的固定阻抗匹配电路206,和经配置以将谐波发射减少到防止耦合到接收器108(图1)的装置的自干扰的水平的低通滤波器(LPF)208。其它实施例可包括不同滤波器拓扑(包括但不限于使特定频率衰减同时使其它频率通过的陷波滤波器),且可包括自适应阻抗匹配,其可基于可测量的发射量度(例如,到天线的输出电力或由功率放大器汲取的DC电流)而改变。发射电路202进一步包括经配置以驱动由振荡器212确定的RF信号的功率放大器210。发射电路可包含离散装置或电路,或替代地,可包含集成组合件。来自发射天线204的示范性RF电力输出可为约2.5瓦。
发射电路202进一步包括处理器214,所述处理器214用于在特定接收器的发射阶段(或工作循环)期间启用振荡器212、用于调整所述振荡器的频率,以及用于调整用于实施通信协议(用于经由相邻装置所附接的接收器与相邻装置交互)的输出电力水平。
发射电路202可进一步包括用于检测在由发射天线204产生的近场附近是否存在活动接收器的负载感测电路216。举例来说,负载感测电路216监视流动到功率放大器210的电流,其受在由发射天线204产生的近场附近的活动接收器的存在与否影响。由处理器214监视对功率放大器210上的负载改变的检测,以用于确定是否启用振荡器212以发射能量以与活动接收器通信。
发射天线204可实施为天线条,其具有经选择以使电阻性损失保持为低的厚度、宽度和金属类型。在常规实施方案中,发射天线204可通常经配置以与较大结构(例如,桌子、垫、灯或其它较不便携的配置)相关联。因此,发射天线204通常将不需要“若干匝”以便具有特定尺寸。发射天线204的示范性实施方案可为“电学上小的”(即,波长的分数)且经调谐以通过使用电容器来界定谐振频率而在较低的可用频率下谐振。在发射天线204在直径或边长(如果为正方形环形)方面相对于接收天线可为较大(例如,0.50米)的示范性应用中,发射天线204将没有必要需要较大匝数以获得合理电容。
图11为根据本发明的实施例的接收器的框图。接收器300包括接收电路302和接收天线304。接收器300进一步耦合到装置350以向其提供所接收的电力。请注意,将接收器300说明为在装置350外部但可集成于装置350中。通常,能量无线地传播到接收天线304且接着经由接收电路302而耦合到装置350。
接收天线304经调谐以在与发射天线204(图10)相同的频率下或几乎相同的频率下谐振。接收天线304可与发射天线204类似地设计尺寸,或可基于相关联装置350的尺寸来不同地设计大小。举例来说,装置350可为具有小于发射天线204的直径或长度的直径或长度尺寸的便携式电子装置。在此类实例中,接收天线304可实施为多匝天线以便减少调谐电容器(未图示)的电容值且增加接收天线的阻抗。举例来说,接收天线304可放置在装置350的实质周长周围,以便最大化天线直径并减少接收天线的环形匝(即,绕组)的数目和绕组间电容。
接收电路302提供与接收天线304的阻抗匹配。接收电路302包括用于将所接收的RF能量源转换为供装置350使用的充电电力的电力转换电路306。电力转换电路306包括RF到DC转换器308且还可包括DC到DC转换器310。RF到DC转换器308将接收天线304处接收到的RF能量信号整流为非交变电力,而DC到DC转换器310将经整流的RF能量信号转换为可与装置350兼容的能量势(例如,电压)。涵盖各种RF到DC转换器,包括部分和全整流器、调节器、桥接器、倍增器以及线性和切换转换器。
接收电路302可进一步包括用于将接收天线304连接到电力转换电路306或替代地用于将电力转换电路306断开的切换电路312。如下文更充分地解释,将接收天线304与电力转换电路306断开不仅中止对装置350的充电,且还改变发射器200(图2)所“看到”的“负载”。如上文所揭示,发射器200包括负载感测电路216,其检测提供到发射器功率放大器210的偏置电流的波动。因此,发射器200具有用于确定接收器何时存在于发射器的近场中的机制。
当多个接收器300存在于发射器的近场中时,可能需要对一个或一个以上接收器的加载和卸载进行时间多路复用以使其它接收器能够更有效地耦合到发射器。还可掩蔽接收器以便消除到其它附近的接收器的耦合或减少附近发射器上的负载。接收器的此“卸载”在本文中还被称为“掩蔽”。此外,如下文更充分地解释,由接收器300控制且由发射器200检测的卸载与加载之间的此切换提供从接收器300到发射器200的通信机制。另外,协议可与所述切换相关联,其实现从接收器300到发射器200的消息发送。举例来说,切换速度可为约100微秒。
在一示范性实施例中,发射器与接收器之间的通信指代装置感测和充电控制机制,而非常规双向通信。换句话说,发射器使用所发射信号的通/断键控来调整能量在近场中是否可用。接收器将这些能量改变解译为来自发射器的消息。从接收器侧,接收器使用接收天线的调谐和去谐来调整正从近场接受多少电力。发射器可检测来自近场的所使用电力的此差异且将这些改变解译为来自接收器的消息。
接收电路302可进一步包括用以识别接收到的能量波动的信令检测器和信标电路314,所述能量波动可对应于从发射器到接收器的信息性信令。此外,信令和信标电路314还可用以检测减少的RF信号能量(即,信标信号)的发射并将所述减少的RF信号能量整流成标称电力以用于唤醒接收电路302内的未供电或电力耗尽的电路以便配置接收电路302以进行无线充电。
接收电路302进一步包括用于协调本文所描述的接收器300的处理(包括对本文所描述的切换电路312的控制)的处理器316。对接收器300的掩蔽还可在发生其它事件(包括检测到向装置350提供充电电力的外部有线充电源(例如,壁式/USB电力))后即刻发生。除了控制接收器的掩蔽外,处理器316还可监视信标电路314以确定信标状态并提取从发射器发射的消息。处理器316还可调整DC到DC转换器310以获得改进的性能。
图12展示用于在发射器与接收器之间进行消息接发的发射电路的一部分的简化示意图。在本发明的一些示范性实施例中,可在发射器与接收器之间启用用于通信的装置。在图12中,功率放大器210驱动发射天线204以产生辐射场。所述功率放大器由在对于发射天线204为所要的频率下振荡的载波信号220来驱动。使用发射调制信号224来控制功率放大器210的输出。
发射电路可通过对功率放大器210使用通/断键控过程来将信号发射到接收器。换句话说,在断言发射调制信号224时,功率放大器210将在发射天线204上驱动出载波信号220的频率。在否定发射调制信号224时,功率放大器在发射天线204上将不驱动出任何频率。
图12的发射电路还包括将电力供应到功率放大器210且产生接收信号235输出的负载感测电路216。在负载感测电路216中,跨电阻器Rs的电压降形成于电力入信号226与功率放大器210的电力供应228之间。功率放大器210所消耗的电力的任何改变将引起将由差动放大器230放大的电压降的改变。当发射天线与接收器(未展示于图12中)中的接收天线处于耦合模式时,由功率放大器210汲取的电流量将改变。换句话说,如果发射天线210不存在耦合模式谐振,则驱动辐射场所需的电力将为第一量。如果存在耦合模式谐振,则功率放大器210所消耗的电力量将上升,因为许多电力耦合到接收天线中。因此,如下文所解释,接收天线235可指示耦合到发射天线235的接收天线的存在且还可检测从接收天线发射的信号。另外,将可在发射器的功率放大器电流汲取中观测到接收器电流汲取的改变,且如下文所解释,此改变可用以检测来自接收天线的信号。
图13A到图13C展示在各种状态下的接收电路的一部分的简化示意图以说明接收器与发射器之间的消息接发。图13A到图13C均展示相同电路元件,不同之处为各个开关的状态。接收天线304包括特性电感L1,其驱动节点350。节点350经由开关S1A选择性地耦合到接地。节点350还经由开关S1B选择性地耦合到二极管D1和整流器318。整流器318将DC电力信号322供应到接收装置(未图示)以向所述接收装置供电、对电池充电,或其组合。二极管D1与电容器C3和电阻器R1一起耦合到发射信号320,发射信号320经滤波以移除谐波和不想要的频率。因此,D1、C3和R1的组合可在发射信号320上产生信号,其模仿由上文参看图12中的发射器而论述的发射调制信号224所产生的发射调制。
本发明的示范性实施例包括对接收装置的电流汲取的调制和对接收天线的阻抗的调制以实现反向链路信令。参看图13A和图12两者,在接收装置的电力汲取改变时,负载感测电路216检测发射天线上的所得电力改变,且从这些改变可产生接收信号235。
在图13A到图13C的实施例中,可通过修改开关S1A和S2A的状态来改变经由发射器的电流汲取。在图13A中,开关S1A和开关S2A均断开而形成“DC断开状态”且实质上从发射天线204移除负载。此减少发射器所经历的电流。
在图13B中,开关S1A闭合且开关S2A断开,从而形成接收天线304的“DC短路状态”。因此,可使用图13B中的状态来增加在发射器中经历的电流。
在图13C中,开关S1A断开且开关S2A闭合,从而形成正常接收模式(在本文中还被称作“DC操作状态”),其中电力可由DC输出信号322供应且可检测到发射信号320。在图13C所示的状态下,接收器接收正常电力量,因此消耗比DC断开状态或DC短路状态时多或少的来自发射天线的电力。
可通过DC操作状态(图13C)与DC短路状态(图13B)之间的切换来实现反向链路信令。还可通过DC操作状态(图13C)与DC断开状态(图13A)之间的切换来实现反向链路信令。
图14A到图14C展示在各种状态下的替代性接收电路的一部分的简化示意图以说明接收器与发射器之间的消息接发。
图14A到图14C均展示相同电路元件,不同之处为各个开关的状态。接收天线304包括特性电感L1,其驱动节点350。节点350经由电容器C1和开关S1B而选择性地耦合到接地。节点350还经由电容器C2而AC耦合到二极管D1和整流器318。二极管D1与电容器C3和电阻器R1一起耦合到发射信号320,发射信号320经滤波以移除谐波和不想要的频率。因此,D1、C3和R1的组合可在发射信号320上产生一信号,其模仿由上文参看图12中的发射器而论述的发射调制信号224所产生的发射调制。
整流器318连接到开关S2B,开关S2B与电阻器R2和接地串联连接。整流器318还连接到开关S3B。开关S3B的另一侧将DC电力信号322供应到接收装置(未图示)以向所述接收装置供电、对电池充电,或其组合。
在图13A到图13C中,通过经由开关S1B选择性地将接收天线304耦合到接地来改变所述接收天线的DC阻抗。相比而言,在图14A到图14C的实施例中,可通过修改开关S1B、S2B和S3B的状态以改变接收天线304的AC阻抗来修改天线的阻抗以产生反向链路信令。在图14A到图14C中,可使用电容器C2来调谐接收天线304的谐振频率。因此,可通过使用开关S1B经由电容器C1来选择性地耦合接收天线304(实质上将谐振电路改变到将处于将与发射天线最佳耦合的范围外的不同频率)来改变接收天线304的AC阻抗。如果接收天线304的谐振频率接近发射天线的谐振频率,且接收天线304处于发射天线的近场中,则可形成耦合模式,其中接收器可从辐射场106汲取显著电力。
在图14A中,开关S1B闭合,此将天线去谐且形成“AC掩蔽状态”,所述“AC掩蔽状态”实质上“掩蔽”接收天线304使其不被发射天线204检测到,因为接收天线不在发射天线的频率处谐振。由于接收天线将不处于耦合模式下,所以开关S2B和S3B的状态对于本论述来说并非特别重要。
在图14B中,开关S1B断开,开关S2B闭合,且开关S3B断开,从而形成接收天线304的“经调谐假负载状态”。因为开关S1B断开,所以电容器C1不影响谐振电路,且与电容器C2组合的接收天线304将处于可与发射天线的谐振频率匹配的谐振频率下。开关S3B断开与开关S2B闭合的组合对于整流器来说形成相对高电流假负载,其将经由接收天线304汲取更多电力,此可由发射天线感测到。另外,可检测到发射信号320,因为接收天线处于从发射天线接收电力的状态下。
在图14C中,开关S1B断开,开关S2B断开,且开关S3B闭合,从而形成接收天线304的“经调谐操作状态”。因为开关S1B断开,所以电容器C1不影响谐振电路,且与电容器C2组合的接收天线304将处于可与发射天线的谐振频率匹配的谐振频率下。开关S2B断开与开关S3B闭合的组合形成正常操作状态,其中可由DC出信号322供应电力且可检测到发射信号320。
可通过经调谐操作状态(图14C)与AC掩蔽状态(图14A)之间的切换来实现反向链路信令。还可通过经调谐假负载状态(图14B)与AC掩蔽状态(图14A)之间的切换来实现反向链路信令。还可通过经调谐操作状态(图14C)与经调谐假负载状态(图14B)之间的切换来实现反向链路信令,因为接收器所消耗的电力量将存在差异,此可由发射器中的负载感测电路检测到。
当然,所属领域的技术人员将认识到,可使用开关S1B、S2B和S3B的其它组合来形成掩蔽、产生反向链路信令以及将电力供应到接收装置。另外,可将开关S1A和S1B添加到图14A到图14C的电路以形成用于掩蔽、反向链路信令以及将电力供应到接收装置的其它可能组合。
因此,在处于耦合模式下时,如上文参看图12所论述,可将信号从发射器发送到接收器。另外,在处于耦合模式下时,如上文参看图13A到图13C和图14A到图14C所论述,可将信号从接收器发送到发射器。
图15A到图15C为说明用于使用上文所论述的信令技术在发射器与接收器之间通信的消息接发协议的时序图。在一种示范性方法中,从发射器到接收器的信号在本文中被称作“前向链路”且使用正常振荡与无振荡之间的简单AM调制。还涵盖其它调制技术。作为非限制性实例,信号存在可解译为1,且无信号存在可解译为0。
通过对接收装置所汲取的电力进行调制来提供反向链路信令,其可由发射器中的负载感测电路检测到。作为非限制性实例,较高电力状态可解译为1,且较低电力状态可解译为0。请注意,发射器必须开启以使接收器能够执行反向链路信令。另外,在前向链路信令期间接收器应不执行反向链路信令。此外,如果两个接收装置试图同时执行反向链路信令,则冲突可发生,此将使发射器难以(如果非不可能)解码适当反向链路信号。
在本文所描述的示范性实施例中,信令类似于具有开始位、数据字节、奇偶位和停止位的通用异步接收发射(UART)串行通信协议。当然,任何串行通信协议可适合于实行本文所描述的本发明的示范性实施例。为便于描述且并非限制,将描述消息接发协议,使得用于传送每一字节发射的周期为约10mS。
图15A说明消息接发协议的最简单且最低电力的形式。将在每个重现周期410(在示范性实施例中为约一秒)重复同步脉冲420。作为非限制性实例,同步脉冲工作时间可为约40mS。在发射器开启时,具有至少一同步脉冲420的重现周期410可无限地重复。请注意,“同步脉冲”略微用词不当,因为如由“空白”脉冲420′所说明,同步脉冲350可为在脉冲周期期间的稳态频率。同步脉冲420还可包括使用上文所论述的通/断键控且如“阴影”脉冲420所说明的在谐振频率处的信令。图15A说明最小电力状态,其中在同步脉冲420期间供应谐振频率处的电力且发射天线在供电周期450期间为关闭的。允许所有接收装置在同步脉冲420期间接收电力。
图15B说明具有同步脉冲420、反向链路周期430和供电周期450′的重现周期410,其中发射天线开启且通过在谐振频率处振荡且不执行任何信令来供应全部电力。上面的时序图说明整个重现周期410,且下面的时序图说明同步脉冲420和反向链路周期430的分解图。如下文所解释,供电周期450′可分成用于多个接收装置的不同周期。图15B展示用于三个不同接收装置的三个供电区段Pd1、Pd2和Pdn。
在前向链路信令发生时,同步脉冲420可包括热身周期422、前向链路周期424和监听周期426。监听周期426可包括移交周期427和开始反向链路周期428。在同步脉冲420期间,发射器可在前向链路周期400(由“阴影”部分指示)期间发送出前向链路消息且在监听周期426期间等待来自接收器的答复。在图15B中,无接收器答复,此由监听周期426期间的“空白”部分指示。
图15C类似于图15B,不同之处在于如由“交叉影线”部分所指示,接收器在开始反向链路周期428和反向链路周期430期间答复。在图15中,在同步脉冲420期间,发射器在前向链路周期400期间发送出前向链路消息且在监听周期426期间等待来自接收器的答复。将要进行答复的任何接收器在移交周期427结束之前、在开始反向链路周期428期间以及可能在反向链路周期430期间开始其答复。
作为非限制性实例,表2展示可由发射器和接收器发射的一些可能消息。
表2
  TX命令   TX消息   RX答复   RX消息
  空
  NDQ(新装置查询)  NDR(新装置响应)   DD TT PP rr cc
  DQ(装置查询)  DD  DS(装置状态)   DD TT PP cc
  ACK(根据先前DS确认装置XX)
  SA(时隙指派)  DD NN MM cc
  RES(重设所有供电时隙指派)
其中:
空=无发射命令;
DD=装置编号;
TT=装置类型;
PP=所请求电力;
rr=随机数;
cc=校验和;
NN=时隙的开始;以及
MM=时隙结束。
在解释表1的过程中,空命令指在前向链路周期424期间发射器不发射消息接发。在第2行中,由发射器发射新装置查询(NDQ)。如果接收装置响应,则其用新装置响应(NDR)以及装置编号(对于新装置来说其应为零,直到发射器指派装置编号为止)、电力请求、随机数和接收答复中的所有数据位的校验和作出响应。
在第3行中,由发射器发射新装置查询(DQ)以及装置编号。曾由所述DQ寻址的接收装置用装置状态(DS)以及装置编号、装置类型、所请求电力量和接收答复中的所有数据位的校验和来进行答复。
在第4行中,发射器将确认(ACK)发送出到对先前DQ答复的接收器。无接收器对ACK作出响应
在第5行中,发射器发送出时隙指派(SA)以及装置编号、供电周期450′内的开始时间、供电周期450′内的结束时间和接收答复中的所有数据位的校验和。无接收器对SA作出响应。
在第6行中,发射器发送出重设(RES),所述重设(RES)指示所有接收器应停止使用其所分配的时隙。无接收器对RES作出响应。
当然,所属领域的技术人员将认识到,所述命令和响应为示范性的,且涵盖于本发明的范围内的各种实施例可使用这些命令和响应的变体,且在本发明的范围内,可想出额外命令和响应。
为了进一步说明如何发生通信,将论述五种不同情形。在第一种情形中,最初无接收装置在发射器的耦合模式区内,且一个接收装置进入所述耦合模式区。在无装置存在于所述耦合模式区中时,发射器将保持在低电力状态下(如图15A所说明)且在每个重现周期410重复同步脉冲420。同步脉冲420在前向链路周期424期间将包括NDQ,且发射器在监听周期426期间将监听答复。如果未接收到答复,则发射器停机,直到用于下一个重现周期410的同步脉冲420的时间为止。
在将新接收装置引入到所述耦合模式区时,所述接收装置最初开启且监听同步脉冲420。所述新接收装置可将同步脉冲420用于电力,但在供电周期450′期间应进入掩蔽或非电力接收模式(本文中被称作“下总线”)。另外,所述新接收装置监听发射命令且忽略除了NDQ外的所有发射命令。在新接收装置接收到NDQ时,其在移交周期427、开始反向链路周期428和可能在反向链路周期430期间保持开启。在前向链路周期424之后且在移交周期427结束之前,接收装置用NDR、为零的装置ID(新装置ID将由发射器指派)、电力量请求、随机数和校验和来作出响应。新接收装置接着在供电周期450′期间下总线。
如果发射器正确地接收到所述NDR,则其在下一个同步脉冲420上使用用于新接收装置的时隙指派(SA)来作出响应。所述SA包括用于新接收装置的装置ID、开始时间、结束时间和校验和。用于此SA的开始时间和结束时间将为零,从而指示新接收装置在供电周期450′期间的任何时间周期内不应上总线。在新接收装置可上总线时,新接收装置将接收指派特定供电区段Pdn的具有实际开始时间和结束时间的后续SA。如果新接收装置未接收到适当校验和,则其保持于新装置模式且再次响应于NDQ。
在第二种情形中,无接收装置在发射器的耦合模式区内,且一个以上接收装置进入所述耦合模式区。在此模式下,在将两个新接收装置引入到所述耦合模式区时,其最初一直在总线上。所述新接收装置可将同步脉冲420用于电力,但一旦已接收到同步脉冲420,便应在供电周期450′期间下总线。另外,所述新接收装置监听发射命令且忽略除了NDQ外的所有发射命令。在新接收装置接收到NDQ时,其在移交周期427、开始反向链路周期428和可能在反向链路周期430期间保持开启。在前向链路周期424之后且在移交周期427结束之前,接收装置用NDR、为零的装置ID(新装置ID将由发射器指派)、电力量请求、随机数和校验和来作出响应。
然而,由于两个或两个以上接收装置同时作出响应,且可能具有不同随机数和校验和,所以发射器所接收到的消息将被混淆,且发射器中的校验和将不精确。结果,发射器将不在后续同步脉冲420上发送出SA。
当在NDR后未出现紧邻SA时,所述接收装置中的每一者在用NDR作出响应之前等待随机数目的后续NDQ。举例来说,两个装置均响应于第一个NDQ,所以无后续SA出现。装置1决定在响应于另一个NDQ之前等待四个NDQ。装置2决定在响应于另一个NDQ之前等待两个NDQ。结果,在发射器发送出下一个NDQ时,无装置用NDR作出响应。在发射器发送出下一个NDQ时,仅装置2用NDR作出响应,发射器成功地接收到所述NDR且发送出用于装置2的SA。在下一个NDQ时,装置2不响应,因为其不再为新装置,且装置1不响应,因为其随机等待周期尚未过去。在发射器发送出下一个NDQ时,仅装置1用NDR作出响应,发射器成功地接收到所述NDR且发送出用于装置1的SA。
在第三种情形中,至少一个接收装置处于耦合模式区中,且新接收装置进入所述耦合模式区。在此模式下,将所述新接收装置引入到所述耦合模式区且其最初一直在总线上。新接收装置可将同步脉冲420用于电力,但一旦已接收到同步脉冲420,便应在供电周期450′期间下总线。另外,新接收装置监听发射命令且忽略除了NDQ外的所有发射命令。周期性地,发射器将发送出NDQ以查看是否有任何新装置已进入所述耦合模式区。新装置将接着用NDR来答复。在后续同步脉冲420时,发射器将发出用于新装置的不指派供电时隙的SA。发射器接着重新计算所述耦合模式区中的所有装置的电力分配且为每一装置产生新SA,所以不存在重叠供电区段Pdn。在每一装置接收到其新SA后,其仅在其新Pdn期间开始上总线。
在第四种情形下,正常电力输送操作继续,无接收装置进入或离开耦合模式区。在此种情形期间,发射器将周期性地用装置查询(DQ)来ping每一装置。所查询的装置用装置状态(DS)作出响应。如果所述DS指示不同电力请求,则发射器可将电力分配重新分配给所述耦合模式区中的每一装置。如上文针对第三种情形所解释的,发射器还将周期性地发出NDQ。
在第五种情形中,从所述耦合模式区移除装置。此“经移除”状态可为物理上从所述耦合模式区移除所述装置、所述装置关闭,或所述装置掩蔽自身(可能因为其不再需要电力)。如早先所陈述,发射器周期性地发送出用于所述耦合模式区中的所有装置的DQ。如果到特定装置的两个连续DQ不传回有效DS,则发射器将所述装置从其所分配装置的列表中移除且将供电周期450′重新分配给剩余装置。发射器还将向遗漏的装置指派零时间的电力分配,以防其不能够发射却仍在接收。如果错误地将装置从电力分配移除,则其可通过用适当NDR响应于NDQ来重新获得电力分配。
表3说明非限制性命令和答复序列以说明通信协议如何操作。
表3
Figure BPA00001254323500181
注意,用于新装置的第一时隙指派不分配时隙。向每一现存装置分配新的非重叠时隙,接着最后向新装置分配时隙以用于接收电力。
在一示范性实施例中,无线充电装置可向用户显示可视信号(例如,光),从而指示其已成功地进入充电区且使其自身向本地发射器登记。此将给予用户肯定反馈,即,装置确实准备好充电。
在本发明的其它示范性实施例中,接收器和发射器可在如图2所示的单独通信信道119(例如,蓝牙、zigbee、蜂窝式等等)上通信。在单独通信信道的情况下,重现周期无需包括任何通信周期且全部时间可专用于供电周期450′。发射器仍可将时隙分配给每一接收装置(经由所述单独通信信道来传送)且每一接收装置仅在其所分配的供电区段Pdn内上总线。
上文所描述的经时间多路复用的电力分配可为用于将电力供应给发射器的耦合模式区内的多个接收装置的最有效方法。然而,在本发明的其它实施例中,可使用其它电力分配方案。
图16A到图16D为说明用于在发射器与一个或一个以上接收器之间发射电力的信标电力模式的简化框图。图16A说明在信标耦合模式区510中不存在接收装置时具有低电力“信标”信号525的发射器520。作为非限制性实例,信标信号525可例如在~10到~20mW RF的范围中。当待充电的装置放置于所述耦合模式区中时,此信号可足以将初始电力提供给所述装置。
图16B说明放置于发射信标信号525的发射器520的信标耦合模式区510内的接收装置530。如果接收装置530开启且与发射器形成耦合,则其将产生反向链路耦合535,其实际上只是接收器接受来自信标信号525的电力。此额外电力可由发射器的负载感测电路216(图12)感测到。因此,发射器可进入高电力模式中。
图16C说明发射器520产生高电力信号525′,从而产生高电力耦合模式区510′。只要接收装置530正接受电力且因此产生反向链路耦合535,发射器便将保持于高电力状态。虽然仅说明一个接收装置530,但耦合模式区510中可存在多个接收装置530。如果存在多个接收装置530,则其将基于每一接收装置530耦合的良好程度来共享由发射器发射的电力量。举例来说,如上文曾参看图8和图9所解释的,对于每一接收装置530来说,耦合效率可依据装置放置于耦合模式区510内的何处而为不同的。
图16D说明即使在接收装置530处于信标耦合模式区510中时发射器520仍产生信标信号525。此状态可在接收装置530关闭时,或装置掩蔽其自身时(可能因为其不再需要电力)发生。
如同时间多路复用模式一样,接收器和发射器可在单独通信信道(例如,蓝牙、zigbee等等)上通信。在单独通信信道的情况下,发射器可基于耦合模式区510中的接收装置的数目和其相应电力要求来确定何时在信标模式与高电力模式之间切换或形成多个电力水平。
本发明的示范性实施例包括在两个天线之间的近场电力传递中经由将额外天线引入到耦合天线的系统中来增强相对大发射天线与小接收天线之间的耦合,所述额外天线将充当转发器且将增强从发射天线朝着接收天线的电力流。
在一示范性实施例中,使用耦合到系统中的发射天线和接收天线的一个或一个以上额外天线。这些额外天线包含转发器天线(例如,有源或无源天线)。无源天线可仅包括天线环形和用于调谐天线的谐振频率的电容性元件。除了天线环形和一个或一个以上调谐电容器外,有源元件可包括用于增加经转发近场辐射的强度的放大器。
电力传递系统中的发射天线与转发器天线的组合可经优化,使得基于例如终端负载、调谐组件、谐振频率和转发器天线相对于发射天线的放置等因素来增强到非常小的接收天线的电力耦合。
单一发射天线展现有限近场耦合模式区。因此,经由在发射天线的近场耦合模式区中的接收器来充电的装置的用户可需要相当大的用户接近空间,此将为代价过高或至少不方便的。此外,所述耦合模式区可随着接收天线移动远离发射天线而快速地减小。
转发器天线可重聚焦和重塑来自发射天线的耦合模式区以在转发器天线周围形成第二耦合模式区,其可更适合于将能量耦合到接收天线。
图17A说明大发射天线710A,其中较小转发器天线720A与发射天线710A共面地安置且安置于发射天线710A的周边内。发射天线710A和转发器天线720A均形成于台740上。包括接收天线730A的装置放置于转发器天线720A的周边内。在非常大的天线的情况下,发射天线710A中心附近可存在相对弱的耦合模式区的区域。在试图耦合到非常小的接收天线730A的情况下,此弱区的存在可尤其显著。与发射天线710A共面放置但具有较小大小的转发器天线720A可能够将由发射天线710A产生的耦合模式区重聚焦成转发器天线720A周围的更小且更强的经转发耦合模式区。因此,相对强的经转发近场辐射可用于接收天线730A。
图17B说明发射天线710B,其中较大转发器天线720B相对于发射天线710B同轴放置。包括接收天线730B的装置放置于转发器天线720B的周边内。发射天线710B形成于灯罩742的下边缘周长周围,而转发器天线720B安置于台740上。应记得在同轴放置的情况下,近场辐射可相对于距天线的平面的距离增加而相对快速地减小。结果,相对于发射天线710B放置成同轴放置的小接收天线730B可处于弱耦合模式区中。然而,与发射天线710B同轴地放置的大转发器天线720B可能够将发射天线710B的耦合模式区重塑成在转发器天线720B周围的不同地方中的另一耦合模式区。结果,相对强的经转发近场辐射可用于与转发器天线720B共面放置的接收天线730B。
图18A说明大发射天线710C,其中三个较小转发器天线720C与发射天线710C共面地安置且安置于发射天线710C的周边内。发射天线710C和转发器天线720C形成于台740上。包括接收天线730C的各种装置放置于发射天线710C和转发器天线720C内的各个位置处。如同图17A所说明的实施例一样,图18A的实施例可能够将由发射天线710C产生的耦合模式区重聚焦成在转发器天线720C中的每一者周围的更小且更强的经转发耦合模式区。结果,相对强的经转发近场辐射可用于接收天线730C。接收天线中的一些放置于任何转发器天线720C外部。应记得耦合模式区可稍微延伸出天线的周边外。因此,接收天线730C可能够从发射天线710C以及任何附近转发器天线720C的近场辐射接收电力。结果,放置于任何转发器天线720C外部的接收天线仍可能够从发射天线710C以及任何附近转发器天线720C的近场辐射接收电力。
图18B说明大发射天线710D,其中较小转发器天线720D相对于发射天线710D有偏移地同轴放置和有偏移地共面放置。包括接收天线730D的装置放置于转发器天线720D中的一者的周边内。作为非限制性实例,发射天线710D可安置于天花板746上,而转发器天线720D可安置于台740上。如同图17B的实施例一样,处于偏移同轴放置的转发器天线720D可能够将来自发射器天线710D的近场辐射重塑并增强成转发器天线720D周围的经转发近场辐射。结果,相对强的经转发近场辐射可用于与转发器天线720D共面放置的接收天线730D。
虽然各种发射天线和转发器天线已大体上展示为在表面上,但这些天线还可安置于表面下(例如,在台下、在地板下、在墙壁后面,或在天花板后面)、或在表面内(例如,台顶部、墙壁、地板或天花板)。
图19展示指示发射天线、转发器天线与接收天线之间的耦合强度的模拟结果。发射天线、转发器天线和接收天线经调谐以具有约13.56MHz的谐振频率。
曲线810说明在各个频率处在馈入到发射天线的总电力中从发射天线发射的电力量的测量。类似地,曲线820说明在各个频率处在接收器天线的端子附近可用的总电力中由接收天线经由转发器天线接收到的电力量的测量。最后,曲线830说明在各个频率处在发射天线与接收天线之间经由转发器天线实际耦合且进入接收天线中的电力量。
在对应于约13.56MHz的曲线830的峰值处,可看到,从发射器发送的大量电力在接收器处为可用的,从而指示发射天线、转发器天线和接收天线的组合之间的高耦合程度。
图20A展示指示在不具有转发器天线的情况下在发射天线与相对于发射天线安置成同轴放置的接收天线之间的耦合强度的模拟结果。发射天线和接收天线经调谐以具有约10MHz的谐振频率。在此仿真中,发射天线在一边上为约1.3米,且接收天线为一边为约30mm的多环形天线。接收天线放置于距发射天线的平面约2米处。曲线810A说明在各个频率处在馈入到发射天线的端子的总电力中从发射天线发射的电力量的测量。类似地,曲线840说明在各个频率处在接收天线的端子附近可用的总电力中由接收天线接收到的电力量的测量。最后,曲线830A说明在各个频率处在发射天线与接收天线之间实际耦合的电力量。
图20B展示指示在转发器天线包括于系统中时图20A的发射天线与接收天线之间的耦合强度的模拟结果。发射天线和接收天线具有与图20A中的大小和放置相同的大小和放置。转发器天线的一边为约28cm且与接收天线共面地放置(即,距发射天线的平面约0.1米)。在图20B中,曲线810B说明在各个频率处在馈入到发射天线的端子的总电力中从发射天线发射的电力量的测量。曲线820B说明在各个频率处在接收天线的端子附近可用的总电力中由接收天线经由转发器天线接收到的电力量。最后,曲线830B说明在各个频率处在发射天线与接收天线之间经由转发器天线实际耦合且进入接收天线中的电力量。
当将来自图20A和图20B的耦合电力(830A和830B)进行比较时,可看到,在不具有转发器天线的情况下,耦合电力830A峰值为约-36dB。而在具有转发器天线的情况下,耦合电力830B峰值为约-5dB。因此,在谐振频率附近,可用于接收天线的电力量归因于将转发器天线包括在内而显著增加。
本发明的示范性实施例包括在所涉及的天线(例如,发射天线、接收天线和转发器天线)中的一者或一者以上的电路中产生负电阻。此负电阻可减少天线导体的正电阻(损耗)和电容器的等效串联电阻(ESR)。在示范性实施例中,使用负电阻反相器。
在示范性实施例中,将负电阻施加到经耦合的发射天线、接收天线、转发器天线或其组合,其在彼此的近场中操作以将电力从连接到发射天线的源无线地传递到连接到接收天线的负载。负电阻的作用为补偿天线的导体损耗和调谐电容器的有限Q。在示范性实施例中,天线和电容器在天线电路中的损耗方面行为较接近于理想天线和电容器,从而导致无线电力传递的较高总效率。尽管产生负电阻需要某一量的电力,但对总拓扑的适当设计将改进系统的端到端效率。在示范性实施例中,对所实现的效率的改进与天线的更好匹配条件相当,此还导致较高效率。可使用有源元件来执行此使用负电阻的匹配程序。
图21说明构成负电阻产生器910的具有正和负反馈的示范性运算放大器电路。负电阻产生器910包括运算放大器920、连接在运算放大器输出与负输入之间的第一反馈电阻器922、连接在运算放大器输出与正输入之间的第二反馈电阻器924,和耦合到正输入的输入电阻器926。负电阻产生器910形成具有在第一端子928与第二端子929之间的等效负电阻930的电路。
其可展示:
I = - ( R 1 R 2 ) ( 1 R f ) V ,
前提条件为-βEsat<V<βEsat
其中 β = R 2 R 1 + R 2 ;
其中Rf为第一反馈电阻器922、R1为第二反馈电阻器924,且R2为输入电阻器926;且
其中±Esat为针对将运算放大器驱动到饱和区的差动输入的给定范围的所述运算放大器的输出电压。
此电路的输入电阻基于其IV特性而等效于负电阻。由-RN用符号展示的负电阻可放置于天线电路中以抵销来自天线电路的其它组件的电阻。
图22A到图22C说明分别包括用于发射天线、转发器天线和接收器天线的负电阻的示范性天线电路。在图22A中,无线电力发射电路940包括与电容元件944耦合的发射天线942,所述电容元件944具有等效串联电阻(ESR)946。所述电容元件与负电阻产生器910A串联耦合。信号产生器950耦合在发射天线942与负电阻产生器910A之间。所述信号产生器提供振荡电力信号,以用于在谐振频率处驱动所述无线电力发射电路940以产生具有近场辐射的耦合模式区。
在图22B中,无线电力转发器电路960包括与电容元件964耦合的转发器天线962,电容元件964具有ESR 966。所述电容元件与负电阻产生器910B串联耦合。如早先所解释,无线电力转发器电路960在谐振频率处振荡以将具有近场辐射的耦合模式区修改成经修改的耦合模式区。
在图22C中,无线电力接收电路980包括与电容元件984耦合的接收天线982,电容元件984具有ESR 986。所述电容元件与负电阻产生器910C串联耦合。负载990耦合在接收天线982与负电阻产生器910C之间。无线电力接收电路980在谐振频率处振荡以接收来自耦合模式区或经转发耦合模式区的能量,且将所述能量供应到负载990,其表示跨越接收天线982的端子的负载(例如,电池和充电电路)的阻抗。
图22B说明将具有用于负电阻产生器910B的电源(未图示)的转发器。当然,转发器电路960可与具有负载990的接收电路980类似地配置。在那种情况下,负载990可经配置以用于产生、储存或产生并储存用于负电阻产生器910B的电力。
在图22A到图22C中,与天线(942、962和982)一起展示的Rc记号表示归因于形成天线的金属的有限导电性而引起的损耗。Rrad记号表示天线的辐射电阻。ESR(946、966和986)为造成有限Q值的电容器的等效串联电阻。电容元件(944、964和984)为理想调谐电容值。-RN(910A、910B和910C)为用于抵销电路中的损耗的负电阻。
在所展示的示范性耦合天线中,可利用全波解决方案。负电阻对此系统中的电力传递的效率的影响可展示如下:
η = R load R load + Σ ( - RN ) + Σ ( R rad + R c + ESR )
对于示范性稳定系统,满足以下条件:
R load + Σ ( R rad + R c + ESR ) > | Σ ( - RN ) |
一般来说,可选择负电阻以抵销天线电路中的大多数损耗。然而,负电阻可经设计成欠补偿的,以使得天线系统保持稳定。
所属领域的技术人员将理解,可使用多种不同技术和技艺中的任一者来表示信息和信号。举例来说,可由电压、电流、电磁波、磁场或磁性粒子、光场或光学粒子或其任何组合来表示可在整个上文描述中参考的数据、指令、命令、信息、信号、位、符号和码片。
所属领域的技术人员应进一步了解,结合本文所揭示的实施例而描述的各种说明性逻辑块、模块、电路和算法步骤可实施为电子硬件、计算机软件或其两者的组合。为清楚地说明硬件与软件的此互换性,已在上文大体上在功能性方面描述各种说明性组件、块、模块、电路和步骤。将此功能性实施为硬件还是软件取决于特定应用和强加于整个系统的设计约束。所属领域的技术人员可针对每一特定应用以不同方式来实施所描述的功能性,但此些实施决策不应被解释为造成偏离本发明的示范性实施例的范围。
可使用通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或其它可编程逻辑装置、离散门或晶体管逻辑、离散硬件组件,或其经设计以执行本文中所描述的功能的任何组合来实施或执行结合本文中所揭示的实施例而描述的各种说明性逻辑块、模块和电路。通用处理器可为微处理器,但在替代实施方案中,处理器可为任何常规处理器、控制器、微控制器或状态机。处理器还可实施为计算装置的组合,例如,DSP与微处理器的组合、多个微处理器的组合、结合DSP核心的一个或一个以上微处理器,或任何其它此类配置。
结合本文中所揭示的实施例而描述的方法或算法的步骤可直接以硬件、以由处理器执行的软件模块或以两者的组合来实施。软件模块可驻留于随机存取存储器(RAM)、快闪存储器、只读存储器(ROM)、电可编程ROM(EPROM)、电可擦除可编程ROM(EEPROM)、寄存器、硬盘、可装卸盘、CD-ROM,或此项技术中已知的任何其它形式的存储媒体中。示范性存储媒体耦合到处理器,使得处理器可从存储媒体读取信息并将信息写入到存储媒体。在替代实施方案中,存储媒体可与处理器成一体。处理器和存储媒体可驻留于ASIC中。ASIC可驻留于用户终端中。在替代实施方案中,处理器和存储媒体可作为离散组件而驻留于用户终端中。
在一个或一个以上示范性实施例中,可以硬件、软件、固件或其任何组合来实施所描述的功能。如果以软件来实施,则所述功能可作为一个或一个以上指令或代码而存储于计算机可读媒体上或经由计算机可读媒体进行传输。计算机可读媒体包括计算机存储媒体和通信媒体两者,通信媒体包括促进将计算机程序从一处传递到另一处的任何媒体。存储媒体可为可由计算机存取的任何可用媒体。以实例而非限制的方式,此计算机可读媒体可包含RAM、ROM、EEPROM、CD-ROM或其它光盘存储装置、磁盘存储装置或其它磁性存储装置,或可用于载运或存储呈指令或数据结构的形式的所要程序代码且可由计算机存取的任何其它媒体。而且,将任何连接适当地称作计算机可读媒体。举例来说,如果使用同轴电缆、光纤电缆、双绞线、数字订户线(DSL)或例如红外线、无线电和微波等无线技术从网站、服务器或其它远程源发射软件,则所述同轴电缆、光纤电缆、双绞线、DSL,或例如红外线、无线电和微波等无线技术包括于媒体的定义中。如本文中使用,磁盘和光盘包括压缩光盘(CD)、激光光盘、光学光盘、数字多功能光盘(DVD)、软盘和蓝光光盘,其中磁盘通常以磁方式再现数据,而光盘用激光以光学方式再现数据。上述各者的组合也应包括于计算机可读媒体的范围内。
提供对所揭示示范性实施例的先前描述以使所属领域的技术人员能够制造或使用本发明。所属领域的技术人员将容易明白对这些示范性实施例的各种修改,且在不脱离本发明的精神或范围的情况下,本文所界定的一般原理可应用于其它实施例。因此,本发明无意限于本文中所展示的实施例,而是将赋予本发明与本文中所揭示的原理和新颖特征一致的最广范围。

Claims (28)

1.一种无线电力接收电路,其包含:
接收天线,其用于在谐振频率处与近场辐射耦合;
电容元件,其可操作地与所述接收天线串联耦合且包含电容值和等效串联电阻值;
负电阻产生器,其可操作地与所述电容元件串联耦合且包含负电阻值;以及
负载,其可操作地与所述负电阻产生器串联耦合且用于在所述无线电力接收电路大体上在所述谐振频率附近振荡时汲取来自所述近场辐射的电力。
2.根据权利要求1所述的无线电力接收电路,其中所述负电阻产生器用于产生所述负电阻值以抵销所述等效串联电阻值、所述接收天线的欧姆电阻或其组合中的至少一些。
3.根据权利要求1所述的无线电力接收电路,其中所述负电阻产生器包含:
运算放大器,其包含放大器输出、正输入和负输入,所述负输入可操作地耦合到所述负电阻产生器的第一端子;
第一反馈电阻器,其可操作地耦合在所述放大器输出与所述负输入之间;
第二反馈电阻器,其可操作地耦合在所述放大器输出与所述正输入之间;以及
输入电阻器,其可操作地耦合在所述负电阻产生器的第二端子与所述正输入之间。
4.根据权利要求3所述的无线电力接收电路,其中所述第一反馈电阻器、所述第二反馈电阻器和所述输入电阻器经选择以产生所述负电阻值,以抵销所述等效串联电阻值、所述接收天线的欧姆电阻或其组合中的至少一些。
5.一种无线电力发射电路,其包含:
发射天线,其用于在谐振频率处产生近场辐射;
电容元件,其可操作地与所述发射天线串联耦合且包含电容值和等效串联电阻值;
负电阻产生器,其可操作地与所述电容元件串联耦合且包含负电阻值;以及
信号产生器,其可操作地与所述负电阻产生器串联耦合,且用于将信号电力施加到所述无线电力发射电路,以使得所述无线电力发射电路大体上在所述谐振频率附近振荡。
6.根据权利要求5所述的无线电力发射电路,其中所述负电阻产生器用于产生所述负电阻值以抵销所述等效串联电阻值、所述发射天线的欧姆电阻或其组合中的至少一些。
7.根据权利要求5所述的无线电力发射电路,其中所述负电阻产生器包含:
运算放大器,其包含放大器输出、正输入和负输入,所述负输入可操作地耦合到所述负电阻产生器的第一端子;
第一反馈电阻器,其可操作地耦合在所述放大器输出与所述负输入之间;
第二反馈电阻器,其可操作地耦合在所述放大器输出与所述正输入之间;以及
输入电阻器,其可操作地耦合在所述负电阻产生器的第二端子与所述正输入之间。
8.根据权利要求7所述的无线电力发射电路,其中所述第一反馈电阻器、所述第二反馈电阻器和所述输入电阻器经选择以产生所述负电阻值,以抵销所述等效串联电阻值、所述发射天线的欧姆电阻或其组合中的至少一些。
9.一种无线电力转发器电路,其包含:
转发器天线,其用于在谐振频率处与在耦合模式区中的近场辐射耦合,且产生不同于所述耦合模式区的经转发耦合模式区;
电容元件,其可操作地与所述转发器天线串联耦合且包含电容值和等效串联电阻值;以及
负电阻产生器,其可操作地与所述电容元件串联耦合且包含负电阻值。
10.根据权利要求9所述的无线电力转发器电路,其中所述负电阻产生器用于产生所述负电阻值以抵销所述等效串联电阻值、所述转发器天线的欧姆电阻或其组合中的至少一些。
11.根据权利要求9所述的无线电力转发器电路,其中所述负电阻产生器包含:
运算放大器,其包含放大器输出、正输入和负输入,所述负输入可操作地耦合到所述负电阻产生器的第一端子;
第一反馈电阻器,其可操作地耦合在所述放大器输出与所述负输入之间;
第二反馈电阻器,其可操作地耦合在所述放大器输出与所述正输入之间;以及
输入电阻器,其可操作地耦合在所述负电阻产生器的第二端子与所述正输入之间。
12.根据权利要求11所述的无线电力转发器电路,其中所述第一反馈电阻器、所述第二反馈电阻器和所述输入电阻器经选择以产生所述负电阻值,以抵销所述等效串联电阻值、所述转发器天线的欧姆电阻或其组合中的至少一些。
13.一种方法,其包含:
在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区;以及
使用安置于所述耦合模式区内的接收天线来接收来自所述耦合模式区的电力,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述产生所述电磁场包括设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些。
14.根据权利要求13所述的方法,其中所述接收来自所述耦合模式区的电力包括设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些。
15.一种方法,其包含:
在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区;以及
使用安置于所述耦合模式区内的接收天线来接收来自所述耦合模式区的电力,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述接收来自所述耦合模式区的电力包括设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些。
16.根据权利要求15所述的方法,其中所述产生所述电磁场包括设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些。
17.一种方法,其包含:
在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区;
使用转发器天线转发所述电磁场以形成不同于所述耦合模式区的经转发耦合模式区;以及
使用安置于所述耦合模式区内的接收天线来接收来自所述经转发耦合模式区的电力,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述产生所述电磁场包括设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些。
18.根据权利要求17所述的方法,其中所述接收来自所述耦合模式区的电力包括设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些。
19.根据权利要求17所述的方法,其中所述转发所述电磁场包括设定所述转发器天线的转发器组件的负电阻值以抵销所述转发器天线的其它转发器组件的等效串联电阻值中的至少一些。
20.根据权利要求19所述的方法,其中所述接收来自所述耦合模式区的电力包括设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些。
21.一种无线电力传递系统,其包含:
用于在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区的装置;以及
用于使用安置于所述耦合模式区内的接收天线来接收来自所述耦合模式区的电力的装置,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述用于产生所述电磁场的装置包括用于设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些的装置。
22.根据权利要求21所述的系统,其中所述用于接收来自所述耦合模式区的电力的装置包括用于设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些的装置。
23.一种无线电力传递系统,其包含:
用于在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区的装置;以及
用于使用安置于所述耦合模式区内的接收天线来接收来自所述耦合模式区的电力的装置,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述用于接收来自所述耦合模式区的电力的装置包括用于设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些的装置。
24.根据权利要求23所述的系统,其中所述用于产生所述电磁场的装置包括用于设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些的装置。
25.一种无线电力传递系统,其包含:
用于在发射天线的谐振频率处产生电磁场以在所述发射天线的近场内形成耦合模式区的装置;
用于使用转发器天线转发所述电磁场以形成不同于所述耦合模式区的经转发耦合模式区的装置;以及
用于使用安置于所述经转发耦合模式区内的接收天线来接收来自所述经转发耦合模式区的电力的装置,其中所述接收天线大体上在所述谐振频率附近谐振;
其中所述用于产生所述电磁场的装置包括用于设定所述发射天线的发射组件的负电阻值以抵销所述发射天线的其它发射组件的等效串联电阻值中的至少一些的装置。
26.根据权利要求25所述的系统,其中所述用于接收来自所述耦合模式区的电力的装置包括用于设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些的装置。
27.根据权利要求25所述的系统,其中所述用于转发所述电磁场的装置包括用于设定所述转发器天线的转发器组件的负电阻值以抵销所述转发器天线的其它转发器组件的等效串联电阻值中的至少一些的装置。
28.根据权利要求27所述的系统,其中所述用于接收来自所述耦合模式区的电力的装置包括用于设定所述接收天线的接收组件的负电阻值以抵销所述接收天线的其它接收组件的等效串联电阻值中的至少一些的装置。
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