CN111791728A - 使用电动机驱动系统的多输入充电系统和方法 - Google Patents
使用电动机驱动系统的多输入充电系统和方法 Download PDFInfo
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- CN111791728A CN111791728A CN201911126015.1A CN201911126015A CN111791728A CN 111791728 A CN111791728 A CN 111791728A CN 201911126015 A CN201911126015 A CN 201911126015A CN 111791728 A CN111791728 A CN 111791728A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- H—ELECTRICITY
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- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
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- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
一种使用电动机驱动系统的多输入充电系统和方法,该系统和方法可以防止在通过电动机的中性点接收外部充电电力并给电池充电的过程中,电动机中的继电器熔接或切断以及设置在充电电力输入级中的中性点电容器的损坏。
Description
技术领域
本发明涉及一种使用电动机驱动系统的多输入充电系统和方法,更具体地,涉及这样一种使用电动机驱动系统的多输入充电系统和方法,其可以防止在通过电动机的中性点接收外部充电电力并使用充电电力给电池充电的过程中,电动机中的继电器熔接或切断(fusing or cutting)以及包括在充电电力输入级中的中性点电容器的损坏。
背景技术
通常,电动车辆或插电式混合动力车辆将从外部充电设备提供的电力转换成适合于对设置在其中的电池进行充电的状态,并将转换后的电力提供给电池以对电池进行充电。
例如,已经制造了用于快速充电的常规充电设备,使得其输出400V的单一电压,但是用于车辆的电池倾向于需要800V或更高的电压以提高效率和行驶里程。因此,尽管快速充电设备仍提供400V的充电电压,但是由于电池具有800V或更高的电压规格,因此需要用于对由外部充电设备提供的电压进行升压的升压转换器来对车辆中使用的电池进行充电。
然而,用于将400V升压至800V的大容量升压转换器非常笨重且昂贵,并且因此,该升压转换器难以包含在车辆中,并且可能导致车辆价格上涨。
因此,已经提出了一种新技术,该新技术是使用逆变器转换通过电动机的中性点提供的外部充电电力,然后将转换后的电力提供给电池以对电池充电的新技术,该新充电技术能够将已构造为现有基础设施并提供相对较低的充电电压的充电设备的电压提高到高电压,而无需额外的设备和额外的成本增加,并且将提升的电压提供给现有技术中的电池。根据该提出的技术,当由充电设备提供的直流电压具有能够对电池充电的水平时,可以将由充电设备提供的直流电压直接施加到电池,并且当由充电设备提供的直流电压低于电池电压时,可以使用根据构成电动机的线圈的电感和逆变器的开关元件来提高充电设备的直流电压,并且将直流电压施加到电池上。
在该传统技术中,使用了多个继电器,该多个继电器用于根据由外部充电设备提供的电压水平来确定提供充电电力的路径,并且将用于稳定电压的电容器附加地应用于充电电力输入级。
因此,为了稳定地将常规技术应用于电池充电,需要用于检查多个继电器是否有故障并防止在充电过程中损坏附加电容器的多种技术。
在本部分中公开的内容仅是为了增强对本发明的一般背景技术的理解,而不应被认为是这些内容构成本领域技术人员已知的现有技术的承认或任何形式的暗示。
发明内容
根据本发明,使用电动机驱动系统的多输入充电系统可以包括:电池;逆变器,用于接收存储在电池中的直流电,将直流电转换为三相交流电,并在电动机驱动模式下输出三相交流电;电动机,利用从逆变器输出的三相交流电来产生转矩;主继电器,具有连接到电池的第一端子和连接到逆变器的第二端子;第一继电器,具有连接到主继电器的第二端子的第一端子;中性点电容器,连接到第一继电器的第二端子;第二继电器,连接在中性点电容器和电动机的中性点之间;第三继电器,具有连接到中性点电容器的第一端子和连接到输入外部充电电力的充电电力输入级的第二端子;和控制器,用于当在不驱动电动机的状态下开始对电池充电的充电模式时,基于输入到充电电力输入级的外部充电电力的电压水平来诊断第一继电器或第二继电器的故障,然后使第三继电器短路,从而将外部充电电力提供给电池以对电池进行充电。
在本发明的一方面,当充电模式开始并且外部充电电力的电压水平为能够对电池充电的水平时,控制器可以使主继电器短路,诊断第一继电器的故障,使第一继电器短路,然后使第三继电器短路,以对电池进行充电。
在本发明的一方面,为了诊断第一继电器的故障,控制器可以向第一继电器提供用于断开第一继电器的控制信号,比较第一继电器的第一端子和第二端子的电压以诊断由于熔接而引起的第一继电器的故障,向第一继电器提供用于将第一继电器短路的控制信号,并且比较第一继电器的第一端子和第二端子的电压以诊断由于切断而引起的第一继电器的故障。
在本发明的一方面,控制器可以在使第三继电器短路之前诊断第二继电器的故障。
在本发明的一方面,为了诊断第二继电器的故障,控制器可以向第二继电器提供用于断开第二继电器的控制信号,然后比较第二继电器的第一端子和第二端子的电压以诊断由于熔接而引起的第二继电器的故障,或向第二继电器提供用于将第二继电器短路的控制信号,然后比较第二继电器的第一端子和第二端子的电压以诊断由于切断而引起的第二继电器的故障。
在本发明的一方面,当充电模式开始并且外部充电电力的电压水平低于电池的电压时,控制器可以使主继电器短路,诊断第二继电器的故障,使第二继电器短路,然后使第三继电器短路,从而将外部充电电力施加到电动机的中性点,并且控制器可以控制逆变器中包括的开关元件,以将外部充电电力的水平提高到能够对电池充电的水平以对电池充电。
在本发明的一方面,为了诊断第二继电器的故障,控制器可以向第二继电器提供用于断开第二继电器的控制信号,然后比较第二继电器的第一端子和第二端子的电压以诊断由于熔接而引起的第二继电器的故障,并向第二继电器提供用于将第二继电器短路的控制信号,然后比较第二继电器的第一端子和第二端子的电压以诊断由于切断而引起的第二继电器的故障。
在本发明的一方面,控制器可以在使第三继电器短路之前诊断第一继电器的故障。
在本发明的一方面,为了诊断第一继电器的故障,控制器可以向第一继电器提供用于断开第一继电器的控制信号,然后比较第一继电器的第一端子和第二端子的电压以诊断由于熔接而引起的第一继电器的故障,或向第一继电器提供用于将第一继电器短路的控制信号,并且比较第一继电器的第一端子和第二端子的电压以诊断由于切断而引起的第一继电器的故障。
在本发明的一方面,控制器可以在使第三继电器短路之前,用与外部充电电力的电压水平相对应的电压对中性点电容器进行充电。
在本发明的一方面,多输入充电系统可以进一步包括:直流链接电容器,在电池和逆变器之间连接;和初始充电电路,用于在主继电器短路之前提供用于对直流链接电容器充电的电力,其中,当外部充电电力的电压水平为能够为电池充电的水平时,控制器在将主继电器短路之前将第一继电器短路,并同时使用从初始充电电路提供的电力对直流链接电容器和中性点电容器进行充电。
在本发明的一方面,在外部充电电力的水平低于电池电压时,控制器可以通过使第二继电器短路并控制逆变器中的开关元件来对中性点电容器进行充电,以将电池的电压施加至中性点电容器。
根据本发明的另一方面,使用上述多输入充电系统的多输入充电方法可以包括:在充电模式开始时使主继电器短路;基于输入到充电电力输入级的外部充电电力的电压水平,诊断第一继电器或第二继电器的故障;和使第三继电器短路,从而将外部充电电力提供给电池以对电池充电。
在本发明的一方面,诊断可以包括:当外部充电电力的电压水平是能够对电池充电的水平时,诊断第一继电器的故障并将第一继电器短路。
在本发明的一方面,诊断可以包括在使第三继电器短路之前,诊断第二继电器的故障。
在本发明的一方面,当充电模式开始如果外部充电电力的电压水平低于电池的电压,使主继电器短路,然后诊断第二继电器的故障。
在本发明的一方面,诊断还可以包括在使第三继电器短路之前,对第一继电器的故障进行诊断。
在本发明的一方面,多输入充电方法可以进一步包括在使第三继电器短路之前,用与外部充电电力的电压水平相对应的电压对中性点电容器进行充电。
根据使用电动机驱动系统的多输入充电系统和方法的多个方面,可以通过在施加为电池充电的电力之前,确定在向电池提供充电电力的路径上设置的继电器是否发生故障来使用多种电压水平的充电电力稳定地对电池充电。
另外,根据使用电动机驱动系统的多输入充电系统和方法的多个方面,可以在输入充电电力之前通过适当地对设置在充电电力输入的输入级的充电电容器进行预充电来阻止在输入充电电力时可能产生的过电流,防止中性点电容器损坏和继电器熔接。
通过本发明可获得的效果不限于上述效果,并且本发明所属领域的技术人员可以从以下描述中明显地理解上述未描述的其他技术效果。
附图说明
从以下结合附图的详细描述中,将更清楚地理解本发明的上述和其他目的,特征和其他优点,其中:
图1是根据本发明的示例性实施例的使用电动机驱动系统的多输入充电系统的电路图;
图2是根据本发明的示例性实施例的使用电动机驱动系统的多输入充电方法的流程图;
图3是更详细地示出了应用于根据本发明的示例性实施例的使用电动机驱动系统的多输入充电方法的继电器故障诊断步骤的流程图;
图4是示出应用于图2所示实施例的初始中性点电容器充电技术的流程图;
图5是根据本发明的另一示例性实施例的使用电动机驱动系统的多输入充电方法的流程图;和
图6是示出应用于图5所示实施例的初始中性点电容器充电技术的流程图。
具体实施方式
在下文中,将参照附图更详细地描述根据多种示例性实施例的使用电动机驱动系统的多输入充电系统和方法。
图1是根据本发明的示例性实施例的使用电动机驱动系统的多输入充电系统的电路图。
参考图1,根据本发明的示例性实施例的充电系统10是如下所述的系统,该系统根据从电动车辆供电设备(EVSE)20提供的充电电力的电压水平通过适当地控制继电器R1和R2的连接状态将从EVSE20供应的充电电力直接提供给电池15或使用提供来驱动电动机11的逆变器13转换充电电力的电压水平,然后将转换后的电压提供给电池15,从而对电池15充电。
通常,用于驱动电动机11的系统可以包括:电池15,其是用于存储用于驱动电动机11的电力的能量存储设备;和逆变器13,其将存储在电池15中的直流电转换成三相交流电,并且将三相交流电提供给电动机11。逆变器13具有三个支线,三个支线与电池15的正极(+)端子和负极(-)端子并联连接,两个开关元件(S1到S6中的两个)与支线L1至L3中的每一个串联连接,并且从两个开关元件的连接节点向电动机11提供单相驱动力。以这种方式,在用于驱动电动机11的电动机驱动模式下在图1中能量从电池15流到电动机11。
另一方面,与上述用于电动机驱动的能量流不同,在用于对电池15充电的充电模式下能量从EVSE 20流向电池15。电池15的充电可以以如下方式进行:响应于由EVSE 20提供的充电电力的电压水平,EVSE 20直接连接到电池15以向电池15提供充电电力,或者通过与逆变器11的每相相对应的支线接收提供给电动机11的中性点N的外部充电电力,并且控制每个支线的开关元件以提高充电电力并向电池15提供提高的充电电力。
在此,电动机11的三相线圈和与其连接的逆变器13的支线L1至L3中的开关元件S1至S6可以在能量从EVSE 20流向电池15的充电模式下构成升压电路。换句话说,根据三相电动机和三相逆变器,形成相当于在电动机11的中性点N与电池15之间并联连接的三个升压电路的电路。
参考图1,充电系统10还包括控制器100。根据本发明的示例性实施例的充电系统10的控制器100可以是处理器(例如,计算机、微处理器、CPU、ASIC、电路、逻辑电路等)。控制器100可以由非暂时性存储器和处理器来实现,非暂时性存储器存储在执行时控制充电系统10的各个部件的操作的例如程序、软件指令再现算法等,并且处理器被配置为执行程序、软件指令再现算法等。在本文中,存储器和处理器可以被实现为单独的半导体电路。可替代地,存储器和处理器可以被实现为单个集成半导体电路。处理器可以体现为一个或多个处理器。
在根据本发明的示例性实施例的电动机驱动系统中,控制器100可以根据由EVSE20提供的充电电力的电压水平来控制继电器R1和继电器R2的连接状态。
当由EVSE 20提供的直流电的电压具有能够为电池充电的水平时,控制器100可以控制第一继电器R1被短路,使得由EVSE 20提供的直流电可以被直接施加到电池15。当由EVSE 20提供的直流电源的电压低于电池15的电压时,控制器100可以控制第二继电器R2短路,通过使用根据构成电动机11的线圈的电感和由逆变器13的开关元件S1至S6实现的升压电路对开关元件S1至S6的进行占空比控制来升高EVSE 20的直流电力的电压,并将升压后的电压施加到电池15。
这里,第一继电器R1是用于确定电池15与用于从EVSE 20接收充电电力的充电电力输入级30之间的电连接状态的继电器,第二继电器R2是用于确定电动机11的中性点N和充电电力输入级30之间电连接状态的继电器。
根据本发明的示例性实施例的使用电动机驱动系统的多输入充电系统可以进一步包括主继电器Rm和第三继电器R3。主继电器Rm连接在电池15和逆变器13之间,并且确定电池15和逆变器13之间的电连接关系,并且第三继电器R3确定充电电力输入级30和充电系统之间的电连接关系。
控制器100可以执行诊断控制,以确定在整个充电过程中第一继电器R1和/或第二继电器R2是否已经发生故障,以及可以根据从EVSE20提供的电压来确定第一继电器R1和第二继电器R2的连接状态。通过对根据稍后将描述的本发明的各种示例性实施例的充电方法的描述,将更加清楚地理解由控制器100执行的诊断控制。
另外,根据本发明的示例性实施例的使用电动机驱动系统的多输入充电系统还可以包括中性点电容器Cn和初始充电电路17,中性点电容器Cn连接在充电电力输入级30的正(+)端子和负(-)端子之间,用于接收来自EVSE 20的充电电力,初始充电电路17用于对设置在逆变器13的输入级的直流电容器Cdc进行初始充电。
在本发明的多种示例性实施例中,控制器100可以在第三继电器R3短路以从EVSE20接收充电电力之前通过电力转换来对初始充电电路17或中性点电容器Cn进行优先充电。
通过根据本发明的各个示例性实施例的多输入充电方法的描述,将更加清楚地理解根据本发明的使用具有前述构造的电动机驱动系统的多输入充电系统的操作和效果。
图2是根据本发明的示例性实施例的使用电动机驱动系统的多输入充电方法的流程图。特别地,图2示出了其中从EVSE 20供应的充电电力的电压具有能够对电池15充电的水平的情况的示例性实施例。
首先,将参照图2描述当从EVSE 20供应的充电电力的电压具有能够对电池15充电的水平时应用的根据本发明的示例性实施例的充电方法。
根据本发明的示例性实施例的使用电动机驱动系统的多输入充电方法可以从步骤S12开始,其中,控制器100在充电模式开始时(S11)使主继电器Rm短路。
当控制器100识别出EVSE 20的充电连接器(未示出)到充电电力输入级30的连接,从EVSE 20接收到关于充电电力的信息(电压、电流规格等),并且然后接收到驱动器的充电指令或根据预设定时器的充电指令时,可以确定充电模式的开始。当充电模式开始时,控制器100可以通过向主继电器Rm发送用于控制将主继电器Rm短路的控制信号来使主继电器Rm短路(S12)。
随后,控制器100可以对第一继电器R1执行故障诊断(S13)。当从EVSE 20提供的充电电力的电压具有能够为电池15充电的水平时,第一继电器R1被短路,使得EVSE 20的直流充电电力被直接施加到电池15为电池15充电而不通过其他电气元件。即,当从EVSE 20提供的充电电力的电压具有能够为电池15充电的水平时,需要连接第一继电器R1,因此对第一继电器R1的故障诊断很重要。
继电器故障诊断可以以如下方式执行:控制器100向继电器提供用于控制继电器的状态的控制信号,然后比较继电器的两个端子的电压。
图3是更详细地示出了应用于根据本发明示例性实施例的使用电动机驱动系统的多输入充电系统的继电器故障诊断步骤的流程图。
参考图3,控制器100将用于断开诊断目标继电器(步骤S13中的第一继电器R1)的控制信号发送到诊断目标继电器(S21),然后比较诊断目标继电器的两个端子的电压(S22)。可以在诊断目标继电器的两个端子处设置用于检测每个端子的电压的电压传感器(未示出),并且可以将由该电压传感器检测到的电压发送到控制器100。
当在步骤S22中诊断目标继电器的两个端子的电压彼此相同时,控制器100可以将诊断目标继电器诊断为已经熔接并且因此不能断开的故障继电器,因为尽管已经发送了用于断开控制的信号,诊断目标继电器没有断开,因此两个端子的电压彼此相同。
当在步骤S22中诊断目标继电器的两个端子的电压彼此不同时,控制器100将用于使诊断目标继电器短路的控制信号发送到诊断目标继电器(S24),并且比较诊断目标继电器的两个端子的电压(S25)。
当在步骤S25中诊断目标继电器的两个端子的电压彼此不同时,控制器100可以将诊断目标继电器诊断为已经被切断并且因此不能短路的故障继电器,因为尽管已经发送了用于短路控制的信号,诊断目标继电器未短路,因此其两个端子的电压彼此不同。
当在步骤S25中诊断目标继电器的两个端子的电压彼此相同时,控制器100可以确定诊断目标继电器是正常的。在修改的示例中,可以改变用于诊断熔接故障的控制和用于诊断切断故障的控制的顺序。
在步骤S13中对第一继电器R1进行故障诊断之后,如果确定第一继电器R1正常,则可以控制第一继电器R1短路,从而随后可以通过第一继电器R1将充电电力提供给电池15。在步骤S13中确定第一继电器R1已经发生故障时,控制器100可以通过车辆仪表板警告发生故障并结束充电模式。
随后,可选地确定第二继电器R2是否发生故障(S14)。尽管当从EVSE 20供应的充电电力的电压具有能够对电池15充电的水平时不使用第二继电器R2,但是如果使用焊接的第二继电器R2充电,则充电电力输入级30和电动机11的中性点短路,使波纹输入到电动机11和逆变器13,不利地影响电动机11和逆变器13。因此,可以可选地确定第二继电器R2是否已经发生故障,以便稍后将第二继电器R2用于充电或维护。
第二继电器R2的故障诊断(S14)可以以与参照图3描述的相同的方式执行,可以执行熔接的诊断和切断的诊断,或者可以任选地仅执行其中一者。
此后,控制器100可以使第三继电器R3短路,从而将从EVSE 20供应的充电电力提供给充电系统以对电池15充电(S15)。
控制器100可以在施加充电电力时监视电池15的充电状态(SOC)(S16),并且在电池100的SOC已经达到预定充电目标值a时断开第三继电器R3以停止充电电力的供应(S17)。
随后,控制器100可以断开主继电器Rm并使中性电容器Cn强制放电(S19)。中性电容器Cn的强制放电可以以控制器100使逆变器的一个支线中包含的两个开关元件短路的方式进行。
当中性电容器Cn的强制放电完成时,控制器100可以断开第一继电器R1以结束充电模式(S20)。
此外,在根据本发明的示例性实施例的多输入充电方法中,可以执行初始充电控制,使得中性点电容器Cn可以以适当水平的电压充电,以防止根据继电器连接由于从EVSE20向中性点电容器Cn施加高电压而导致的过电流流入而导致中性点电容器Cn损坏和第三继电器R3熔接。
在图2所示的实施例中执行的充电中,与电池15的电压相对应的电压也通过第一继电器R1施加到中性点电容器Cn,因此中性点电容器Cn也可以使用现有的初始充电电路17来充电,以便对用于在电池15侧的逆变器13的端子处产生直流电压的直流电容器Cdc进行初始充电。这里,初始充电电路17是用于在主继电器Rm短路之前向直流电容器Cdc提供适当的电压和电流以对直流电容器Cdc进行充电的电路。
由于初始充电电路17是用于当主继电器Rm从断开状态切换到短路状态时防止由于突然的电流流入而损坏直流电容器Cdc的电路,因此可以在主继电器Rm被短路之前将第一继电器R1短路,使得直流电容器Cdc和中性点电容器Cn可以一起充电。
图4是示出应用于图2所示实施例的初始中性点电容器充电技术的流程图。
参考图4,控制器100可以首先使第一继电器R1短路(S31),然后在充电模式开始(S11)之后驱动初始充电电路17以对直流电容器Cdc和中性点电容器Cn充电(S32)。当通过设置在直流电容器Cdc和中性点电容器Cn中的电压传感器(未示出)将直流电容器Cdc和中性点电容器Cn以预定电压充电从而完成初始充电(S33)时,过程可以进行后续步骤S12。
如上所述,根据本发明的示例性实施例,可以阻止在输入充电电力时可能产生的过电流,以防止由于对设置在以预定电压输入充电电力的位置的中性点电容器Cn进行充电而引起的中性点电容器Cn的损坏和第三继电器R3熔接。
接下来,将描述当由EVSE 20提供的充电电力的电压具有低于电池15的电压的水平时的充电方法。
图5是根据本发明的另一示例性实施例的使用电动机驱动系统的多输入充电方法的流程图,并且示出了当充电电源的电压低于电池15的电压时的充电方法的实施例。
参考图5,根据本发明的示例性实施例的使用电动机驱动系统的多输入充电方法可以从步骤S42开始,其中,控制器100在充电模式开始时(S41)使主继电器Rm短路。步骤S41和步骤S42与图2中描述的步骤S11和S12基本相同,因此省略附加说明。
随后,控制器100可以对第二继电器R2执行故障诊断(S43)。当从EVSE 20供应的充电电力的电压低于电池15的电压时,第二继电器R2被短路,使得EVSE 20的直流充电电力被施加到电动机11的中性点N,并且中性点N的电压通过逆变器13的开关元件的控制而升压,并被提供给电池15,从而对电池15进行充电。即,当从EVSE 20供应的充电电力的电压低于电池15的电压时,对第二继电器R2进行故障诊断很重要,因为需要连接第二继电器R2。
通过以上参考图3的描述,可以理解对第二继电器R2的故障诊断,因此省略了附加说明。
在步骤S43中通过针对第二继电器R2的故障诊断确定第二继电器R2正常之后,可以控制第二继电器R2短路,从而可以通过第二继电器R2向电池15提供充电电力。在步骤S43中确定第二继电器R2已经发生故障时,控制器100可以通过车辆仪表盘等警告发生故障,并结束充电模式。
随后,可以可选地确定第一继电器R1是否发生故障(S44)。尽管当从EVSE 20提供的充电电力的电压低于电池15的电压时不使用第一继电器R1,但是可以可选地诊断第一继电器R1的故障以事先确定第一继电器R1是否故障以使用第一继电器R1用于稍后进行充电或维护。
第二继电器R2的故障诊断(S44)可以以与参考图3描述的相同的方式执行,可以执行熔接的诊断和切断的诊断,或者可以任选地仅执行其中一者。
此后,控制器100可以使第三继电器R3短路,使得从EVSE 20供应的充电电力被提供给充电系统以对电池15充电(S45)。
在该步骤S45中,控制器100可以控制逆变器13的开关元件S1至S6的脉冲宽度调制,以接收电动机11的三相电流Ia、Ib和Ic,中性点电容器Cn的电压Vn和直流电容器Cdc的电压Vdc,并向电池15提供所需水平的电压和电流。在申请人申请的KR 10-2018-0043152A,KR 10-2018-0154797A和KR 10-2018-0160200A中公开了通过控制器100执行的各种电压控制和电流控制方法,并且控制升压转换器拓扑中的开关元件以进行升压的方法在本领域中是已知的,因此,用于提高充电电力并将充电电力提供给电池15的控制方法的附加描述被省略。
控制器100可以在施加充电电力的同时监视电池15的充电状态(SOC)(S46),并且在电池100的SOC已经达到预定充电目标值a时断开第三继电器R3以停止供应充电电力(S47)。
随后,控制器100可以断开主继电器Rm和强制对中性电容器Cn放电(S49)。控制器100可以通过使包括在逆变器的支线中的开关元件中的位于下部的开关元件S2、S4和S6短路来对中性电容器Cn进行强制放电,或者可以使包括在每个支线中的两个开关元件都短路以引起中性电容器Cn和直流电容器Cdc两者的强制放电。
当中性电容器Cn的强制放电完成时,控制器100可以断开第二继电器R2以结束充电模式(S50)。
此外,在从EVSE 20提供的充电电力的电压低于电池15的电压时的充电控制的情况下,还需要执行初始充电控制以使用适当水平的电压对中性点电容器Cn预充电以防止由于继电器连接而从EVSE 20向中性点电容器Cn施加高电压而引起的过电流流入而导致中性点电容器Cn损坏以及第三继电器R3熔接。
在当从EVSE 20提供的充电电力的电压低于电池15的电压的充电控制中,可以通过在第三继电器R3短路之前使用逆变器13的电压降控制将电池15的电力提供给中性点电容器Cn来进行初始充电,而不是使用基于电池15的电压执行初始充电的初始充电电路17。
图6是示出应用于图5所示实施例的初始中性点电容器充电技术的流程图。
参考图6,在对图5的第一继电器进行故障诊断(S44)之后,控制器100可以控制包括在逆变器13的至少一个支线中的开关元件,使得电池15的电压下降并提供给中性点电容器Cn。当发生从电池15到中性点N的电力流动时,逆变器13的一个支线中包括的开关元件以及由电动机11的线圈产生的电感可以构成降压转换器。使用降压转换器,控制器100可以控制开关元件,使得由包括在逆变器13的至少一个支线中的开关元件和电动机11的线圈组成的降压转换器可以向中性点电容器Cn提供适当的初始充电电压和电流(S51)。
当通过逆变器13的电压降控制完成以期望电压对中性点电容器Cn的充电时(S52),控制器100可以使第三继电器R3短路,从而施加从EVSE 20提供的充电电力到充电系统。
如上所述,根据本发明的各种示例性实施例的使用电动机驱动系统的多输入充电系统和方法,可以通过在施加为电池充电的电力之前,确定在向电池提供充电电力的路径上设置的继电器是否发生故障来使用多种电压的充电电力稳定地对电池充电。
另外,根据本发明的多种示例性实施例的使用电动机驱动系统的多输入充电系统和方法可以在输入充电电力之前通过适当地对设置在充电电力输入的输入端子的充电电容器进行预充电来阻止在输入充电电力时可能产生的过电流,防止中性点电容器损坏和继电器熔接。
尽管已经出于说明性目的公开了本发明的优选实施例,但是本领域技术人员将理解,在不脱离所附权利要求中公开的本发明的范围和精神的情况下,可以进行各种修改、添加和替换。
Claims (18)
1.一种使用电动机驱动系统的多输入充电系统,包括:
电池;
逆变器,用于接收存储在所述电池中的直流电,将所述直流电转换为三相交流电,并在电动机驱动模式下输出所述三相交流电;
电动机,利用从所述逆变器输出的三相交流电来产生转矩;
主继电器,具有连接到所述电池的第一端子和连接到所述逆变器的第二端子;
第一继电器,具有连接到所述主继电器的第二端子的第一端子;
中性点电容器,连接到所述第一继电器的第二端子;
第二继电器,连接在所述中性点电容器和所述电动机的中性点之间;
第三继电器,具有连接到所述中性点电容器的第一端子和连接到输入外部充电电力的充电电力输入级的第二端子;和
控制器,用于当在不驱动所述电动机的状态下开始对所述电池进行充电的充电模式时,基于输入到所述充电电力输入级的外部充电电力的电压水平来诊断所述第一继电器或所述第二继电器的故障,然后使所述第三继电器短路,从而将外部充电电力提供给所述电池以对所述电池进行充电。
2.根据权利要求1所述的多输入充电系统,其中,当所述充电模式开始并且外部充电电力的电压水平为能够对所述电池进行充电的水平时,所述控制器使所述主继电器短路,诊断所述第一继电器的故障,使所述第一继电器短路,然后使所述第三继电器短路,以对所述电池进行充电。
3.根据权利要求2所述的多输入充电系统,其中,为了诊断所述第一继电器的故障,所述控制器向所述第一继电器提供用于断开所述第一继电器的控制信号,比较所述第一继电器的第一端子和第二端子的电压以诊断由于熔接而引起的所述第一继电器的故障,向所述第一继电器提供用于将所述第一继电器短路的控制信号,并且比较所述第一继电器的第一端子和第二端子的电压以诊断由于切断而引起的所述第一继电器的故障。
4.根据权利要求2所述的多输入充电系统,其中,所述控制器在使所述第三继电器短路之前诊断所述第二继电器的故障。
5.根据权利要求4所述的多输入充电系统,其中,为了诊断所述第二继电器的故障,所述控制器向所述第二继电器提供用于断开所述第二继电器的控制信号,然后比较第二继电器的第一端子和第二端子的电压以诊断由于熔接而引起的所述第二继电器的故障,或向所述第二继电器提供用于将所述第二继电器短路的控制信号,然后比较所述第二继电器的第一端子和第二端子的电压以诊断由于切断而引起的所述第二继电器的故障。
6.根据权利要求1所述的多输入充电系统,其中,当所述充电模式开始并且所述外部充电电力的电压水平低于所述电池的电压时,所述控制器使所述主继电器短路,诊断所述第二继电器的故障,使所述第二继电器短路,然后使所述第三继电器短路,从而将外部充电电力施加到所述电动机的中性点,并且
所述控制器控制所述逆变器中包括的开关元件,以将外部充电电力的水平提高到能够对所述电池进行充电的水平以对所述电池进行充电。
7.根据权利要求6所述的多输入充电系统,其中,为了诊断所述第二继电器的故障,所述控制器向所述第二继电器提供用于断开所述第二继电器的控制信号,然后比较所述第二继电器的第一端子和第二端子的电压以诊断由于熔接而引起的所述第二继电器的故障,并向所述第二继电器提供用于将所述第二继电器短路的控制信号,然后比较所述第二继电器的第一端子和第二端子的电压以诊断由于切断而引起的所述第二继电器的故障。
8.根据权利要求6所述的多输入充电系统,其中所述控制器在使所述第三继电器短路之前对所述第一继电器的故障进行诊断。
9.根据权利要求8所述的多输入充电系统,其中,为了诊断所述第一继电器的故障,所述控制器向所述第一继电器提供用于断开所述第一继电器的控制信号,然后比较所述第一继电器的第一端子和第二端子的电压以诊断由于熔接而引起的所述第一继电器的故障,或向所述第一继电器提供用于将所述第一继电器短路的控制信号,并且比较所述第一继电器的第一端子和第二端子的电压以诊断由于切断而引起的所述第一继电器的故障。
10.根据权利要求1所述的多输入充电系统,其中,所述控制器在使所述第三继电器短路之前,用与所述外部充电电力的电压水平相对应的电压对所述中性点电容器进行充电。
11.根据权利要求10所述的多输入充电系统,还包括:
直流链接电容器,连接在所述电池和所述逆变器之间;和
初始充电电路,用于在所述主继电器短路之前提供用于对所述直流链接电容器进行充电的电力,
其中,当外部充电电力的电压水平为能够为所述电池进行充电的水平时,所述控制器在将所述主继电器短路之前将所述第一继电器短路,并同时使用从所述初始充电电路提供的电力对所述直流链接电容器和所述中性点电容器进行充电。
12.根据权利要求10所述的多输入充电系统,其中,在所述外部充电电力的水平低于所述电池的电压时,所述控制器通过使所述第二继电器短路并控制所述逆变器中的开关元件来对所述中性点电容器进行充电,以将所述电池的电压施加至所述中性点电容器。
13.一种多输入充电方法,使用根据权利要求1所述的多输入充电系统,所述多输入充电方法包括以下步骤:
在充电模式开始时使所述主继电器短路;
基于输入到所述充电电力输入级的外部充电电力的电压水平,诊断所述第一继电器或所述第二继电器的故障;以及
使所述第三继电器短路,从而将所述外部充电电力提供给所述电池以对所述电池进行充电。
14.根据权利要求13所述的多输入充电方法,其中,所述诊断包括:当所述外部充电电力的电压水平是能够对所述电池进行充电的水平时,诊断所述第一继电器的故障并使所述第一继电器短路。
15.根据权利要求14所述的多输入充电方法,其中,所述诊断包括:在使所述第三继电器短路之前,诊断所述第二继电器的故障。
16.根据权利要求13所述的多输入充电方法,其中,所述诊断包括:当所述充电模式开始并且所述外部充电电力的电压水平低于所述电池的电压时,使所述主继电器短路,然后诊断所述第二继电器的故障。
17.根据权利要求16所述的多输入充电方法,其中,所述诊断还包括在使所述第三继电器短路之前,对所述第一继电器的故障进行诊断。
18.根据权利要求13所述的多输入充电方法,还包括:在使所述第三继电器短路之前,用与所述外部充电电力的电压水平相对应的电压对所述中性点电容器进行充电。
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