CN108879813B - 接近检测装置及方法 - Google Patents
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Abstract
一种用于车辆充电器系统的电路装置,其适于当充电连接器插入充电插座中并且充电周期终止时减小连接器接近检测电路中的漏极电流,其中所述电路装置包括并联连接并且布置在接近检测电路中的电阻和开关,其中所述开关适于当充电周期已经开始时断开,并且其中所述开关适于当充电周期已经终止并且充电连接器保持在充电插座中时保持断开。本发明的优点是减小了充电器电路的漏极电流。
Description
技术领域
本发明涉及一种用于车辆充电器系统的电路装置,其适于当充电连接器插入充电插座中并且充电周期终止时减小接近检测电路中的漏极电流。
背景技术
电动车辆通常涉及具有存储能量的电池或电池单元的车辆,其中电池被设计成提供用于推进和加速车辆的电力并且还用于向车辆中使用的电气系统提供电力。存储的能量在使用电动车辆时被消耗并且电池需要通过连接到外部电源被重新充电以补充存储的能量的水平。
混合电动车辆是使用内燃发动机系统和电力推进系统的组合。取决于行驶状况,内燃发动机能够间歇地运行以在需要时向混合电动车辆的传动系提供动力。在低速驾驶情形下,车辆可以通过仅使用电力推进系统来运行,并且当需要更多动力时(例如当以更高的速度行驶时)内燃发动机向传动系供应附加的动力。此外,混合电动车辆具有存储能量的电池或电池单元,其中电池用于提供用于推进和加速车辆以及用于车辆中使用的各系统的电力。插电式混合电动车辆使用具有可再充电电池的系统,所述可再充电电池能够通过连接到外部电源而恢复到完全充电状态。
当电动车辆或混合电动车辆中的电池再充电时,通常使用车载充电系统。车载充电器连接到外部电源,外部电源提供例如适合于对电池再充电的直流电(DC)。车载充电器通常通过具有充电连接器的充电电缆连接到电源,充电连接器被设计成匹配布置在车辆中的相应充电插座。
为了能够开始充电周期,在充电器和车辆之间发送几个控制信号。控制了充电连接器到充电插座的正确连接。进一步控制了接地连接是正确的并且车辆准备好充电。当所有控制都正确时,充电周期能够通过从充电器向车辆发送一个或多个充电序列信号而开始。通过接收充电序列信号,车辆将通过闭合电力线中的开关将电力线从电源连接到电池。用于使用直流电的车辆的充电方法的一个示例是CHAdeMO。
为了防止在接地连接断开时开始充电周期,CHAdeMO系统设置有误驱动防止电路,该电路将检测断开的接地连接并且如果接地连接断开将防止充电周期开始。
误驱动防止电路包括在连接器接近检测电路中。连接器接近检测电路用于检测充电连接器正确地插入充电插座中。为此,提供了一个10mA的检测电流,其通过使用光耦合器检测。当充电连接器连接到充电插座且充电周期尚未开始或者当充电周期终止时,检测电流流动。在充电期间,检测电流电路断开使得没有检测电流流过电路。
该解决方案可能出现的一个问题是,如果充电连接器长时间连接到车辆,电池可能会放电或漏电。一种这样的情形可能是如果驾驶员例如休假并将充电连接器遗留在车辆中。
US 2012/0032634公开了一种适合于与车载车辆充电器一起使用的接近检测电路,以便在车载充电器不需要测试该车载充电器到充电站的连接的一段时间内促进电流保存。所示的解决方案可用于特定的充电器。然而,其包括大量的部件并且还与例如CHAdeMo充电器系统不兼容。
因此存在对用于电动车辆充电器系统的改进的且经济有效的电路设计的需求。
发明内容
因此,本发明的一个目的是提供一种适于减小车辆充电器系统的漏极电流的改进的电路装置。本发明的另一个目的是提供一种用于减小车辆充电器系统的漏极电流的方法。
根据本发明的问题的解决方案描述于关于电路装置的权利要求1的特征部分、关于车辆的权利要求7以及关于方法的权利要求8中。其它各权利要求包含本发明的电路装置和车辆的有利的进一步发展。各权利要求还包含用于执行这种方法的计算机程序和计算机程序产品。
在用于车辆充电器系统的电路装置中,当充电连接器插入充电插座中并且充电周期终止时,该车辆充电器系统适于减小连接器接近检测电路中的漏极电流,本发明的目的是通过以下方式实现的:电路装置包括并联连接并且布置在连接器接近检测电路中的电阻和开关,其中所述开关适于当充电周期已经开始时断开,并且所述开关适于当充电周期已经终止且充电连接器保持在充电插座中时保持断开。
通过根据本发明的电路装置的该第一实施例,提供了一种将显著减小漏极电流的电路装置,并且该电路装置在充电周期开始之前仍然允许对正确插入的充电连接器的检测。
本发明的电路装置包括并联连接的电阻和开关。该电路装置与连接器接近检测电路的部件串联布置在充电器和误驱动防止电路之间。当电路装置的开关闭合时,连接器接近检测电路将正常工作使得能够通过10mA检测电流检测正确插入的充电连接器。通过断开电路装置的开关,电路装置的电阻根据电阻的大小将流过连接器接近检测电路的电流减小到很低的值。该电流被称为漏极电流。合适的电阻值可以是例如100kΩ,其将给出大约0.1mA的漏极电流值。优选具有低于0.2mA的漏极电流。
当充电周期已经终止时,即当充电器处于睡眠模式并且充电连接器仍然插入充电插座中时,电路装置的开关能够断开。在这种情况下,不需要流过连接器接近检测电路的检测电流。当充电连接器插入充电插座中并且充电周期未开始时该检测电流是很重要的。
在电流检测电路中使用光耦合器来检测流过连接器接近检测电路的电流,并且将因此确定充电连接器仍然连接到车辆的充电插座。当电流检测电路没有检测到任何电流时,它将确定充电连接器从车辆的充电插座移除。现在电路装置的开关将闭合使得连接器接近检测电路将正常工作,并且使得检测电流流过连接器接近检测电路。
在正常状况下,当充电周期终止时,流过连接器接近检测电路的电流为10mA并不是问题。然而,如果车辆在充电连接器连接到车辆的情况下持续几周或更长时间,则电池将损失其一些容量。与车辆的其它也在低电压下运行的电气设备(例如报警器、遥控接收器、定时器等)结合,车辆的总的空闲电流不太高是很重要的。这还因为与设置有内燃发动机的车辆相比电动车辆的低电压电池相对较小而是很重要的,设置有内燃发动机的车辆的低电压电池必须能够运行如起动电机。在一些车辆中,低电压是通过由高电压电池驱动的DC/DC转换器提供的。在这种情况下减小总的空闲电流也是有利的。
在用于减小车辆充电器系统的连接器接近检测电路中的漏极电流的方法中,包括以下步骤:当充电周期已经开始时,通过断开与附加电阻并联连接的开关,将附加电阻与车辆中的连接器接近检测电路中的已有电阻串联连接,以及当充电周期终止时,只要充电连接器保持在充电插座中就保持开关断开。
通过该方法的该第一实施例,该方法将能够在充电连接器保持在充电插座中时以及在充电周期终止时减小车辆充电器系统的漏极电流。这将减小车辆的空闲电流,其将允许车辆在插入充电连接器的情况下持续几周而不影响车辆的电池的容量。
附图说明
下面将参考附图更详细地描述本发明,其中:
图1示出了根据本发明的电路装置,
图2示出了包括根据本发明的电路装置的示意性车辆,以及
图3示出了用于减小车辆充电系统的检测电流的本发明的方法的流程图。
具体实施方式
在下面描述的具有进一步发展的本发明的实施例仅被视为示例并且绝不限制本专利各权利要求所提供的保护的范围。
图1示出了根据本发明的电路装置。电路装置1包括在连接器接近检测电路2中。连接器接近检测电路2还包括适于检测充电器系统的未连接的或断开的接地连接的误驱动防止电路3。连接器接近检测电路连接到外部充电器(未示出),该外部充电器包括布置在接地端子5和充电连接器6之间的第一电阻4。电阻4通常是200Ω电阻。充电连接器包括适于控制信号的多条导线,包括CAN总线导线以及两条用于充电电流的高电流电缆。充电连接器6连接到布置在车辆上的充电插座7。
连接器接近检测电路2包括第二电阻8,其通常是1000Ω电阻。所述连接器接近检测电路还包括电路装置1,该电路装置1包括并联连接的第三电阻13和第二开关14。第二开关适于旁路第三电阻使得连接器接近检测电路能够用于检测在充电周期开始之前充电连接器是否连接到充电插座。第二开关可以是继电器或半导体开关,并且由驱动电路(未示出)控制。第三电阻13具有相对高的电阻,例如在50-100kΩ的范围内,使得能够实现低于0.2mA的电流。当第二开关断开时,第三电阻将与第二电阻8和第一电阻4串联连接。
连接器接近检测电路还包括具有可以是继电器并且由驱动电路10控制的第一开关9的误驱动防止电路3。当充电器在充电时,驱动电路被控制以断开第一开关9,并且当充电器处于睡眠模式时,即当充电器未充电时闭合第一开关。误驱动防止电路连接到由车辆的低电压电池或由通过高电压电池驱动的DC/DC转换器供应的具有12V电压的低电压端子12。当第一开关9闭合并且第二开关14闭合时,检测电流将流过连接器接近检测电路。电流将由包括光耦合器的电流检测电路11检测。电流从低电压端子12流过光耦合器的发光二极管并流过电阻8和4而流到接地端子5。电流将是大约10mA并且将通过光耦合器的使用来检测。当充电器给车辆的高压电池充电时第一开关9断开。当充电周期终止并且充电器处于睡眠模式时第一开关9将再次闭合。
当充电周期已经开始时,第一开关9和第二开关14都断开。当充电周期终止时,第一开关9闭合但是第二开关14保持断开。当充电器处于睡眠模式时,电流检测电路将继续检测流过连接器接近检测电路的电流。只要检测到电流,第二开关14就保持断开以减小漏极电流。漏极电流在此优选低于0.2mA。当未检测到任何电流时,系统将确定充电连接器未插入充电插座中,因为连接器接近检测电路是断开的。现在将闭合第二开关14从而旁路所述电阻13。现在连接器接近检测电路将正常工作。下一次将充电连接器插入充电插座中时,10mA的检测电流将流过连接器接近检测电路。
图2示出了包括设有根据本发明的电路装置1的车载充电器电路31的车辆30。所述车载充电器电路将给高电压电池32充电。该电路装置集成在车辆的车载充电电路31中。充电插座7可位于燃料入口通常所定位的车辆的后部,或者位于车辆的前部。电路装置的第二开关14由包括在车载充电器电路系统中的充电器控制单元控制。
图3示出了用于减小车辆充电器系统的接近检测电路中的检测电流的方法的示意流程图。
该方法在电动车辆的高电压电池被充电并且充电周期已经终止且充电连接器仍然连接到车辆时执行。该方法步骤优选通过包含并且运行于车辆的电子控制单元中的计算机程序和计算机程序产品来执行。
在步骤100中,车辆的充电周期开始。充电器处于睡眠模式并且充电连接器插入车辆的充电插座7中。连接器接近检测电路的第一开关9和电路装置1的第二开关14都闭合。
在步骤110中,充电电路通过检测到检测电流流过连接器接近检测电路来确定充电连接器被插入。检测电流在这种情况下必须高于预定的阈值水平以便被识别为检测电流以及符合CHAdeMO规范。因此在此示例中检测电流是10mA。电流由电流检测电路检测。充电器电路进一步确定接地连接正确以及车辆准备好充电。当所有控制器都正确时,充电周期能够通过从充电器向车辆发送一个或多个充电序列信号而开始。
在步骤120中,充电器电路接收充电序列信号并且通过闭合电力线中的接触器将来自充电器的电源的电力线连接到电池。车辆的高电压电池的充电开始,并且充电器是主动模式。第一开关9和第二开关14都被充电器电路断开。通过断开第二开关,第三电阻与接近检测电路中的现有电阻串联连接。
在步骤130中,车辆电池的充电结束。充电终止并且充电器处于睡眠模式。第一开关9闭合但第二开关14保持断开。这样,流过连接器接近检测电路的电流将相对低,这减小了车辆的空闲电流。电流由电流检测电路检测。当电流检测电路未检测到任何电流时,第二开关将闭合,因为确定了充电连接器已经从充电插座移除。
本发明不应被视为限制于上述实施例,在随后的专利权利要求的范围内可能有许多额外变化和修改。
附图标记
1:电路装置
2:连接器接近检测电路
3:误驱动防止电路
4:第一电阻
5:接地端子
6:充电连接器
7:充电插座
8:第二电阻
9:第一开关
10:驱动电路
11:电流检测电路
12:低电压端子
13:第三电阻
14:第二开关
30:车辆
31:车载充电器电路
32:高电压电池
Claims (9)
1.一种用于车辆充电器系统的电路装置(1),其适于当充电连接器(6)插入充电插座(7)中并且充电周期终止时减小连接器接近检测电路(2)中的漏极电流,其中所述电路装置(1)包括并联连接且布置在所述连接器接近检测电路(2)中的大于50kΩ的电阻(13)和开关(14),其中所述电路装置(1)连接在所述连接器接近检测电路(2)的误驱动防止电路(3)与充电插座(7)之间,其中所述开关(14)适于当充电周期已经开始时断开,并且所述开关(14)适于当充电周期已经终止且充电连接器(6)保持在充电插座(7)中时保持断开。
2.根据权利要求1所述的电路装置,其中所述电路装置适于使用在CHAdeMO充电系统中。
3.根据前述权利要求中任一项所述的电路装置,其中流过所述连接器接近检测电路的检测电流由电流检测电路(11)检测。
4.根据权利要求3所述的电路装置,其中所述开关(14)适于在所述充电连接器(6)从所述充电插座(7)移除时闭合。
5.根据权利要求4所述的电路装置,其中所述开关(14)适于在所述电流检测电路未检测到电流时闭合。
6.车辆,其中所述车辆(30)包括根据前述权利要求中任一项所述的电路装置(1)。
7.一种用于减小车辆充电器系统的连接器接近检测电路中的漏极电流的方法,其包括以下步骤:
当充电周期已经开始时,通过断开与大于50kΩ的附加电阻(13)并联连接的开关(14),将附加电阻(13)与车辆中的连接器接近检测电路中的现有电阻(8)串联连接,其中所述附加电阻(13)连接在所述连接器接近检测电路(2)的误驱动防止电路(3)与充电插座之间,
当充电周期终止时,只要充电连接器(6)保持在充电插座(7)中,则保持开关(14)断开。
8.根据权利要求7所述的方法,其包括当电流检测电路(11)未检测到流过所述连接器接近检测电路的电流时关闭所述开关(14)的附加步骤。
9.一种计算机可读存储介质,其包括存储于其上的计算机程序,当所述计算机程序在处理器上运行时执行权利要求7或8任一项所述的步骤。
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