CN108072781A - 用于检测逆变器的大功率线路的漏电流的装置和方法 - Google Patents
用于检测逆变器的大功率线路的漏电流的装置和方法 Download PDFInfo
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Abstract
提供了一种用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置和方法,包括:制造为同步发动机的起动发电机,常规的励磁绕组缠绕在转子上,起动发电机为引擎产生起动扭矩和发电扭矩;48V蓄电池,其提供48V直流DC电力并由起动发电机充电;12V蓄电池,其向车辆内部的电器元件提供电力;集成化起动发电机ISG控制逆变器,其被提供在起动发电机和48V蓄电池之间,作为功率半导体开关控制起动发电机的定子和转子,其中从逆变器引出的绕组通过电刷和滑环与转子相连接;DC‑DC转换器,其将48V蓄电池的电力转换为12V蓄电池的电力,并提供12V电力;共模CM扼流圈,其被提供在ISG控制逆变器和48V蓄电池之间;和漏电流检测器,其与CM扼流圈相连接以检测漏电流。
Description
本申请要求2016年11月18日提交的申请号为2016-153967的韩国专利申请的优先权和权益,其全部内容通过引用并入本文。
技术领域
本发明涉及一种用于检测48V轻度混合动力系统的逆变器的漏电流的装置和方法,更具体地说,涉及一种用于通过在逆变器和48V蓄电池之间提供共模(CM)扼流圈(choke)和附加绕组(additional winding)来检测漏电流的装置和方法。
背景技术
应用于48V轻度混合动力系统的起动发电机(集成化起动发电机(ISG))为引擎提供起动扭矩和发电扭矩,且其通常作为同步发动机被制造,在所述同步发动机中励磁绕组(field winding)缠绕在转子上。
提供起动发电机控制逆变器作为功率半导体开关,其用于控制起动发电机的定子和转子,从逆变器引出的绕组通过电刷和滑环与转子相连接。
在48V轻度混合动力系统中,为了减少逆变器和转换器的大小和成本,制造具有正常非隔离拓扑(normal non-isolated topology)的电源电路的电源转换器,其中所述逆变器和转换器用于60V或者更低的低压直流电(DC)的条件下并组成48V系统,其被分类为低电压的。由于非隔离电源转换器的性能,用于现有的车辆的12V蓄电池电源的地和48V系统的地具有相同的电位。通常,在一般的车辆中,12V蓄电池电源的地为接地于车辆底盘。
在非隔离系统中,48V地和12V地具有相同的电位,当连接到非隔离逆变器的48V电力线的负极(-)线(或者地线)具有大电阻或者由于接触故障断开时,由蓄电池供应到逆变器的48V负载电流可以通过12V地线(或者车辆底盘)流向12V蓄电池的地线,从而导致电器安全问题。此外,存在由于漏电流引起的噪声而导致其他的电气元件可能会发生故障的问题。
为了检测常规大功率线路的电缆接触故障,现有的电源转换器,例如高电压逆变器和转换器,使用提供互锁功能的连接器,以检测连接器的接触故障或者未插入。然而,存在由于开发专用的连接器的成本而引起的部件成本的增加,且存在尽管具有互锁功能但不能检测到高电压DC电线中生成的漏电流的问题。
发明内容
本发明涉及一种使用共模(CM)扼流圈检测漏电流的方法和系统,其中所述共模(CM)扼流圈是通常使用的电力部件。
进一步地,本发明涉及使用48V轻度混合动力起动发电机(MHSG)控制逆变器检测漏电流的方法。
本发明的范围不限于上述目的,本领域技术人员可以从下文的描述中清楚地了解其它未提及的目的。
根据本发明的一个方面,提供了用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置,所述装置包括:制造为同步发动机的起动发电机,其中,常规励磁绕组缠绕在转子上,所述起动发电机被配置为为引擎产生起动扭矩和发电扭矩;48V蓄电池,其被配置为提供48V直流DC电力并由所述起动发电机充电;12V蓄电池,其被配置为向车辆内部的电气元件提供电力;集成化起动发电机ISG控制逆变器,其被提供在所述起动发电机和所述48V蓄电池之间,作为控制所述起动发电机的定子和转子的功率半导体开关,其中从逆变器引出的绕组通过电刷和滑环与所述转子相连接;DC-DC转换器,其被配置为将所述48V蓄电池的电力转换为12V蓄电池的电力并提供所述12V电力;CM扼流圈,其被提供在所述ISG控制逆变器和所述48V蓄电池之间;以及,漏电流检测器,其与所述CM扼流圈相连接并被配置为检测漏电流。
根据本发明的另一方面,提供了检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法,所述方法包括:通过起动发电机为引擎产生起动扭矩和发电扭矩;通过ISG控制逆变器将从所述发电扭矩产生的48V DC电力提供给48V蓄电池;通过DC-DC转换器将所述48V DC电力提供给12V蓄电池;允许所述逆变器的电接线断开,并由于感生电动势在CM扼流圈内生成漏电压;测量所述漏电压;以及,由所述漏电压检测漏电流。
附图说明
通过参照附图详细描述本发明的上述和其他目的,特征和优点的示例性实施例,对于本领域的普通技术人员,本发明的上述和其他目的,特征和优点将会变得更加明显,其中:
图1示出了用于描述根据本发明实施例的实现检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的计算机系统的配置的图;
图2示出了48V轻度混合动力系统的基础配置的图;
图3示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的配置的图;
图4示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置中的逆变器的共模(CM)扼流圈的透视图;
图5示出了根据本发明的实施例通过用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流装置执行检测漏电流的程序的电路图;
图6示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的示意图;以及
图7A至图7C示出了根据本发明的实施例的根据仿真使用用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的描述检测漏电流的方法的实验结果的图。
具体实施方式
参照附图和下文中详细描述的实施例,应充分的理解本发明的优点和特征及其实现方法。然而,本发明不限于下面将公开的实施例,并且可以以各种不同的形式来实现。提供实施例是为了完全解释本发明,并为本领域技术人员全面地解释本发明的范围。本发明的范围由所附权利要求限定。同时,这里使用的术语仅用于描述本发明的实施例而不是为了限制的目的。除非上下文另有明确说明,单数形式包括复数形式。应理解,本文中使用的术语“包括”、“和/或”、“包括”,指定一些所陈述的组件,步骤,操作和/或元件,但不排除存在或添加一种或多种其它组件,步骤,操作和/或元件。
在下文中,将参照附图详细描述本发明的示例性实施例。
图1示出了用于描述根据本发明实施例的实现检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的计算机系统的配置的图。
同时,根据本发明的实施例的检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法可以在计算机系统中实现或者记录在记录介质中。如图1中所示,计算机系统可以包括至少一个处理器110,存储器(memory)120,用户输入设备150,数据通信总线130,用户输出设备160,存储器(storage)140。上述组件通过数据通信总线130执行彼此之间的数据通信。
计算机系统还可以包括网络接口170,其与网络180连接。处理器110可以是中央处理器(CPU)或者可以是处理存储在存储器120和/或存储器140中的指令的半导体设备。
存储器120和存储器140可以包括多种类型的易失性或非易失性存储介质。例如,存储器120可以包括只读存储器(ROM)123和随机存取存储器(RAM)126。
因此,根据本发明的实施例的检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法可以以计算机可执行的方式来实现。当根据本发明的实施例的检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法在计算机系统中执行时,计算机可读指令可以执行根据本发明的实施例的检测方法。
同时,根据本发明的上述检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法可以实现为计算机可读记录介质中的计算机可读代码。计算机可读记录介质包括所有类型的存储由计算机系统解码的数据的记录介质。例如,计算机可读记录介质可以包括ROM,RAM,磁带,磁盘,闪存,光数据存储等。此外,分配给通过计算机网络连接的计算机系统并可以以分布式方式读取的代码可以在计算机可读记录介质中存储和执行。
图2示出了48V轻度混合动力系统的基础配置的图。
混合动力车指的是被制造为使用两个或多个动力传动系统的汽车。通常,通过将电动发动机添加到常规的使用石油的引擎,制造混合动力车。混合动力车被分为全混合动力系统,轻度混合动力系统,以及插电式混合动力系统。与全混合动力系统不同,轻度混合动力系统基于引擎电源,其发动机仅作为协助。也就是说,轻度混合动力系统可以不仅仅由发动机驱动。然而,轻度混合动力系统的优势在于,与其制造成本相比,其燃料效率比高。由于柴油汽车产生的环境问题近来已成为问题,世界上的主要的汽车公司,例如大众汽车,奥迪,作为本发明的申请人的现代摩比斯等,已经变得对48V轻度混合动力系统感兴趣,并推动其发展。
48V轻度混合动力系统包括引擎,起动发电机,集成化起动发电机ISG控制逆变器,48V蓄电池,转换器,12V蓄电池以及作为其基础部件的12V电气组件。
在48V轻度混合动力系统中,起动发电机经常被称为ISG,应用于48V轻度混合动力系统的起动发电机经常被制造为同步发动机,在其中励磁绕组缠绕在转子上,从而为引擎提供起动扭矩和发电扭矩。换句话说,通常,当启动引擎和在驾驶过程中协助电动机,或者当蓄电池电量用尽时作为发电机操作时,使用起动发电机。
ISG控制逆变器提供在起动发电机和48V蓄电池之间。ISG控制逆变器作为功率半导体开关被提供,其控制起动发电机的定子和转子,并且从所述逆变器引出的绕组通过电刷和滑环与转子相连接。在48V轻度混合动力系统中,提供在48V蓄电池和12V蓄电池之间的转换器是直流(DC)-DC转换器,其将48V电压转换为12V电压。
在48V轻度混合动力系统中,为了减少逆变器和转换器的大小和成本,制造具有正常非隔离拓扑的电源电路的电源转换器,其中所述逆变器和转换器使用于60V或者更低的低电压DC条件下并组成48V系统。由于非隔离电源转换器的性能,用于现有的车辆的12V蓄电池电源的地和48V系统的地具有相同的电位。通常,在一般的车辆中,12V蓄电池电源的地为接地于车辆底盘。
在非隔离系统中,48V地和12V地具有相同的电位,当连接到非隔离逆变器的48V电力线的负极(-)线(或者地线)具有大电阻或者由于接触故障断开时,由蓄电池供应到逆变器的48V负载电流可以通过12V地线(或者车辆底盘)流向12V蓄电池的地线,从而导致电器安全问题。此外,存在由于漏电流引起的噪声而导致其他的电气元件可能会发生故障的问题。
为了检测常规大功率线路的电缆接触故障,现有的电源转换器,例如高电压逆变器和转换器,使用提供互锁功能的连接器,以检测连接器的接触故障或者未插入。然而,在这种情况下,存在需要开发专用连接器且专用连接器以高价应用的劣势,此外,存在尽管具有互锁功能但可能不能检测到高电压DC电线中生成的漏电流的问题。
在本发明中,公开了一种利用常规使用的电力部件来检测漏电流的方法和装置。在一实施例中,公开了检测48V轻度混合动力起动发电机(MHSG)控制逆变器的漏电流的方法。
图3示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的配置的图。
在根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置中,逆变器集成化起动发电机IISG通常包括符合EMC标准设计的输入滤波器。CM扼流圈用于减小输入滤波器中的CM噪声。
CM扼流圈是电力部件(感应器),其用于减少CM噪声电流。然而,通过缠绕在常规铁氧体磁芯上的附加绕组和正极(+)和负极(-)线,流进两条电线的电流之间的差,即漏电流,可以被检测出。如CM扼流圈安装在逆变器的实施例,图4中的CM扼流圈上缠绕的48V正极(+)和负极(-)线之外,可以提供一个或多个附加绕组例如“B”。
图4示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置中的逆变器的共模(CM)扼流圈的透视图。
图5示出了根据本发明的实施例由用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流装置执行的检测漏电流的程序的电路图。
图5是示出了提供附加绕组的状态的电路图。包括在逆变器中的输入滤波器包括CM扼流圈,附加绕组B(参见图4)或者附加绕组C(参见图5)与CM扼流圈相连接。在图5的C处检测出由大功率DC正极(+)和负极(-)线之间的电流差(漏电流)生成的漏电压,将检测到的电压通过二极管整流器转换为DC电压,以检测正极/负极电压,并且将转换后的DC电压与被设置为用于检测漏电流的测试电压Vset进行比较,以检测出泄漏状况。将会参考图7A到图7C再次描述检测泄漏状况的方法。
CM扼流圈用作逆变器的大功率输入单元中的电磁兼容(EMC)调节的输入滤波器。当由于48V正(+)和负(-)线的负载电流之间的暂时不平衡而产生泄漏电流时,提供附加绕组以检测由感应器产生的感生电动势的电压。
根据本发明,通过将附加绕组安装在包括在常规逆变器中的CM扼流圈上,可以检测到漏电流,而不会增加额外的成本。
安装在CM扼流圈上的附加绕组与逆变器的控制板相连接,并连接到用于检测漏电流的控制电路的输入单元。通过二极管整流器使用检测到的漏电压以检测正极/负极输入负载电流,被整流为DC(+)的电压与被设置为用于检测漏电压的测试电压Vset比较,以确定泄漏状况。
图6示出了根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的图。
根据本发明的实施例的用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置包括:制造为同步发动机的起动发电机,其中,常规的励磁绕组缠绕在转子上,起动发电机被配置为为引擎产生起动扭矩和发电扭矩;48V蓄电池,其被配置为提供48VDC电力并由起动发电机充电;12V蓄电池,其被配置为向车辆内部的电器元件提供电力;ISG控制逆变器,其被提供在起动发电机和48V蓄电池之间,并作为控制起动发电机的定子和转子的功率半导体开关,其中从逆变器引出的绕组通过电刷和滑环与转子相连接;DC-DC转换器,其被配置为将48V蓄电池的电力转换为12V蓄电池的电力,并提供所述12V电力;CM扼流圈,其被提供在ISG控制逆变器和48V蓄电池之间;以及漏电流检测器,其与CM扼流圈相连接,并被配置为检测漏电流。
图7A到图7C示出了根据本发明的实施例的根据仿真使用用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置的描述检测漏电流的方法的实验结果的图。
图7A至图7C示出了本发明提出的方法的仿真波形。示出了漏电流检测标识的图7A可以示出48V大功率线路的负极(-)电缆断开0.001秒的情况。这是本发明中最终获得的结果。然而,在本发明中,不是在逆变器中单独提供电流检测器,而是在CM扼流圈中提供的附加绕组中生成的感生电动势被整流器整流,然后将其与测试电压Vset进行比较。图7C中示出了漏电压V。
等式1是根据感应电动势得到的漏电压V的公式,具体如下:
【等式1】
例如,当假定测试电压为0.18V,底盘电流iground由下面的等式2确定:
【等式2】
因为Vset是预设值,所以它是已知的。因为V-Vset由图5中的比较器得知,可以获得图7C中示出的结果。当集成电路连接到图5的电路时,可以获得在图7B的图的底部的底盘电流的值,因此,可以轻易地检测到漏电流状况。根据本发明的实施例的检测漏电流的方法可以检测大功率线路的漏电流和电缆断开。
根据本发明,可以使用作为常规电力部件的CM扼流圈检测漏电流。作为具体实施例,提供了使用48V MHSG控制逆变器检测漏电流的方法。
根据本发明,在电源转换器,例如48V轻度混合动力系统的逆变器和转换器中,可以以低成本实现用于检测大功率线路的漏电流和电缆断开的装置,并因此改进系统的可靠性,且因为没有使用包括互锁功能的连接器,可以减少系统的生产成本系统。48V轻混合动力市场的扩大,可以降低与功率转换器(例如逆变器和转换器)的部件相关的材料的成本,并且可以确保系统的可靠性。
如上所述,虽然已经参照相应附图描述了本发明的配置,但是这些配置仅作为示例。对于本领域技术人员来说显而易见的是,可以在本发明的范围内进行各种修改和更改。因此,应当理解,本发明的范围不是由本发明的详细描述而是由所附权利要求限定的。
Claims (8)
1.一种用于检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的装置,所述装置包括:
起动发电机,其被制造为同步发动机,其中常规励磁绕组缠绕在转子上,所述起动发电机被配置为为引擎产生起动扭矩和发电扭矩;
48V蓄电池,其被配置为提供48V直流DC电力并由所述起动发电机充电;
12V蓄电池,其被配置为向车辆内部的电气元件提供电力;
集成化起动发电机ISG控制逆变器,其被提供在所述起动发电机和所述48V蓄电池之间,作为控制所述起动发电机的定子和所述转子的功率半导体开关,其中从所述逆变器引出的绕组通过电刷和滑环与所述转子相连接;
DC-DC转换器,其被配置为将所述48V蓄电池的电力转换为12V蓄电池的电力并提供所述12V电力;
共模CM扼流圈,其被提供在所述ISG控制逆变器和所述48V蓄电池之间;以及
漏电流检测器,其与所述CM扼流圈相连接并被配置为检测漏电流。
2.根据权利要求1所述的装置,其中:
所述CM扼流圈包括附加绕组;以及
当连接到所述逆变器的电接线断开时,所述附加绕组被感生电动势感应并生成漏电压。
3.根据权利要求1所述的装置,其中所述漏电流检测器包括:
二极管整流器,其被配置为对所述CM扼流圈中生成的漏电压进行整流;
比较器,其被配置为将所述经整流的电压与预设的测试电压进行比较;以及
确定器,其被配置为根据所述比较的结果确定是否生成了漏电流。
4.根据权利要求1所述的装置,还包括:存储器(120)和处理器(110),
其中:
所述漏电流检测器输出检测到的漏电压;以及
所述处理器(110)通过整合所述输出的漏电压测量所述漏电流。
5.一种检测48V轻度混合动力系统的逆变器的大功率线路的漏电流的方法,所述方法包括:
通过起动发电机为引擎产生起动扭矩和发电扭矩;
通过ISG控制逆变器将从所述发电扭矩产生的48V DC电力提供给48V蓄电池;
通过DC-DC转换器将所述48V DC电力提供给12V蓄电池;
允许所述逆变器的电接线断开,并由于感生电动势在CM扼流圈内生成漏电压;
测量所述漏电压;以及
由所述漏电压检测漏电流。
6.根据权利要求5所述的方法,其中,在所述漏电压的生成中,当连接到所述逆变器的电接线断开时,包括附加绕组的CM扼流圈被感生电动势感应,生成所述漏电压,且通过所述附加绕组将所述漏电压传输到漏电流检测器。
7.根据权利要求5所述的方法,其中检测所述漏电流包括:
通过二极管整流器整流在所述CM扼流圈中生成的所述漏电压;
通过比较器将所述经整流的电压与预设的测试电压进行比较;以及
根据所述比较的结果确定是否生成了漏电流。
8.根据权利要求5所述的方法,其中检测所述漏电流包括通过整合所述检测到的漏电压测量所述漏电流。
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CN112997090A (zh) * | 2020-07-10 | 2021-06-18 | 深圳欣锐科技股份有限公司 | 车载dc/dc搭铁线检测电路 |
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CN109532560B (zh) * | 2018-11-28 | 2021-01-15 | 广汽丰田汽车有限公司 | 混合动力汽车的控制方法、设备、存储介质及装置 |
EP3663121B1 (en) | 2018-12-03 | 2023-09-27 | Volvo Car Corporation | Method and system for reconnecting a power source to an electrical system including two voltage levels, especially after a crash |
CN110460259B (zh) * | 2019-07-25 | 2021-06-22 | 南京邮电大学 | 一种十开关交错箝位三相光伏逆变器拓扑结构 |
CN112014665A (zh) * | 2020-08-07 | 2020-12-01 | 清华大学 | 燃料电池大功率dc-dc变换器测试系统 |
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US10310002B2 (en) | 2019-06-04 |
KR102522608B1 (ko) | 2023-04-17 |
US20180143235A1 (en) | 2018-05-24 |
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