CN114475484A - A kind of automobile electrical system and automobile - Google Patents

A kind of automobile electrical system and automobile Download PDF

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Publication number
CN114475484A
CN114475484A CN202210276772.2A CN202210276772A CN114475484A CN 114475484 A CN114475484 A CN 114475484A CN 202210276772 A CN202210276772 A CN 202210276772A CN 114475484 A CN114475484 A CN 114475484A
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battery
isolation circuit
electronic switch
diode
converter
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CN114475484B (en
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焦利民
朱宏斌
陈世元
孔令刚
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Shanghai Valeo Automotive Electrical Systems Co Ltd
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Shanghai Valeo Automotive Electrical Systems Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other DC sources, e.g. providing buffering

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an automobile electrical system and an automobile, comprising: the automobile electric system also comprises a direct current converter, a first isolation circuit and a second isolation circuit; the first end of the first isolation circuit and the first end of the second isolation circuit are both connected with the first battery, and the second end of the first isolation circuit and the second end of the second isolation circuit are both connected with the first side of the direct current converter; the second battery is connected with the second side of the direct current converter; the third end of the second isolation circuit is respectively connected with a plurality of electric devices; the first isolation circuit comprises at least one first isolation device and is used for turning off the corresponding first isolation device when the voltage abrupt change of one side of the direct current converter is detected, so that the voltage between the first side and the second side of the direct current converter is isolated. The invention can avoid the adverse effect of the voltage fluctuation of the power grid on the electric equipment and ensure the safety of the automobile power supply network.

Description

一种汽车电气系统及汽车A kind of automobile electrical system and automobile

技术领域technical field

本发明涉及汽车技术领域,尤其涉及一种汽车电气系统及汽车。The invention relates to the technical field of automobiles, in particular to an automobile electrical system and an automobile.

背景技术Background technique

目前燃油乘用车普遍采用单一的12V铅酸蓄电池,这种汽车电气系统无法避免大功率用电器和电控器共用一个电源后,大功率用电器的用电波动会给电控器带来干扰。并且由于智能座舱等新技术的快速发展,其对汽车电网电能在稳定和安全方面的要求也越来越高,如果只有一个独立蓄电池供电(没有冗余电源网络),难以满足乘用车对稳定和安全的要求。At present, fuel passenger vehicles generally use a single 12V lead-acid battery. This kind of automotive electrical system cannot avoid that after high-power electrical appliances and electronic controllers share a power supply, the fluctuation of power consumption of high-power electrical appliances will cause interference to the electronic controller. . And due to the rapid development of new technologies such as smart cockpits, the requirements for the stability and safety of the power grid of the vehicle are also getting higher and higher. and safety requirements.

目前已有一些方案提及采用冗余电源网络作为供电网络,这一类供电网络虽然也能解决了共用一个电源时大功率用电器的用电波动给电控器带来干扰的问题,但是现有的一些方案却没有解决当某一个电源或与其连接的关联电路出现电压扰动现象时,如何有效隔绝电压扰动对另一个电源和关联电路产生影响,导致的难以为用电设备进行稳定供电的问题。At present, some schemes have mentioned the use of redundant power supply network as the power supply network. Although this type of power supply network can also solve the problem of interference to the electronic controller caused by the fluctuation of power consumption of high-power electrical appliances when a power supply is shared, the current Some solutions do not solve the problem of how to effectively isolate the impact of voltage disturbance on another power supply and related circuits when a voltage disturbance occurs in a power supply or its associated circuit, which makes it difficult to provide stable power supply to electrical equipment. .

发明内容SUMMARY OF THE INVENTION

本发明提供了一种汽车电气系统及汽车,解决了在冗余电源网络中,当某一个电源或与其连接的关联电路出现电压扰动现象时,另一个电源和关联电路会受到电压扰动,导致的难以为用电设备进行稳定供电的技术问题。The invention provides an automobile electrical system and an automobile, which solves the problem that in a redundant power supply network, when a certain power supply or an associated circuit connected to it has a voltage disturbance phenomenon, another power supply and an associated circuit will be subject to voltage disturbance, resulting in The technical problem that it is difficult to provide stable power supply for electrical equipment.

根据本发明的一方面,提供了一种汽车电气系统,包括:According to an aspect of the present invention, an automotive electrical system is provided, comprising:

至少两个电池,至少两个电池包括第一电池和第二电池,所述汽车电气系统还包括直流转换器和第一隔离电路;at least two batteries, the at least two batteries include a first battery and a second battery, and the vehicle electrical system further includes a DC converter and a first isolation circuit;

所述第一隔离电路的第一端连接所述第一电池,所述第一隔离电路的第二端连接所述直流转换器的第一侧;所述第二电池连接所述直流转换器的第二侧;The first end of the first isolation circuit is connected to the first battery, the second end of the first isolation circuit is connected to the first side of the DC converter; the second battery is connected to the DC converter second side;

所述第一隔离电路包括至少一个第一隔离器件,用于当检测到所述直流转换器的一侧发生电压突变时,关断对应的所述第一隔离器件,使得所述直流转换器的第一侧和第二侧之间的电压隔离。The first isolation circuit includes at least one first isolation device, which is used to turn off the corresponding first isolation device when a sudden voltage change occurs on one side of the DC converter, so that the DC converter is Voltage isolation between the first side and the second side.

可选的,还包括第二隔离电路,所述第二隔离电路的第一端连接所述第一电池,所述第二隔离电路的第二端连接所述直流转换器的第一侧,所述第二隔离电路的第三端连接多个用电设备;Optionally, it further includes a second isolation circuit, the first end of the second isolation circuit is connected to the first battery, the second end of the second isolation circuit is connected to the first side of the DC converter, so The third end of the second isolation circuit is connected to a plurality of electrical equipment;

所述第二隔离电路包括至少一个第二隔离器件,用于阻断所述第二隔离电路一侧的电流流入到所述第二隔离电路的另一侧,同时使得所述第一电池和所述第二电池均通过所述第二隔离器件为用电设备供电。The second isolation circuit includes at least one second isolation device for blocking the flow of current on one side of the second isolation circuit to the other side of the second isolation circuit, while allowing the first battery and all The second battery supplies power to the electrical equipment through the second isolation device.

可选的,所述第一隔离电路包括串联的第一电子开关和第二电子开关;所述第一电子开关和第二电子开关互为反向的连接。Optionally, the first isolation circuit includes a first electronic switch and a second electronic switch connected in series; the first electronic switch and the second electronic switch are connected in opposite directions.

可选的,所述第一电子开关和所述第二电子开关均包括MOS管和第三二极管,所述MOS管的栅极与所述直流转换器的控制侧相连,源极连接所述第三二极管的正极,漏极连接所述第三二极管的负极。Optionally, both the first electronic switch and the second electronic switch include a MOS tube and a third diode, the gate of the MOS tube is connected to the control side of the DC converter, and the source is connected to the The anode of the third diode is connected to the drain, and the cathode of the third diode is connected to the drain.

可选的,所述第二隔离电路包括第一二极管和第二二极管;Optionally, the second isolation circuit includes a first diode and a second diode;

所述第一二极管的正极连接所述直流转换器的第一端,所述第一二极管的负极连接所述第二二极管的负极,所述第二二极管的正极连接所述第一电池。The anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery.

可选的,所述第一二极管和所述第二二极管的负极均连接保险丝的一端,所述保险丝的另一端连接用电设备。Optionally, the cathodes of the first diode and the second diode are both connected to one end of the fuse, and the other end of the fuse is connected to the electrical equipment.

可选的,所述第一隔离电路包括一个第三电子开关,所述第三电子开关的一端连接所述直流转换器的第一端,另一端连接所述第一电池。Optionally, the first isolation circuit includes a third electronic switch, one end of the third electronic switch is connected to the first end of the DC converter, and the other end is connected to the first battery.

可选的,所述第一隔离电路包括至少一个保险丝,所述保险丝的一端连接所述直流转换器的第一端,另一端连接所述第一电池。Optionally, the first isolation circuit includes at least one fuse, one end of the fuse is connected to the first end of the DC converter, and the other end is connected to the first battery.

可选的,所述第一电池的供电电压小于所述第二电池的供电电压;所述第一电池为12V供电电池,所述第二电池为24V供电电池,所述第一电池和所述第二电池为锂电池。Optionally, the power supply voltage of the first battery is lower than the power supply voltage of the second battery; the first battery is a 12V power supply battery, the second battery is a 24V power supply battery, the first battery and the The second battery is a lithium battery.

根据本发明的另一方面,提供了一种汽车,包括起动机、发电机和本申请第一方面提供的一种汽车电气系统,所述第二电池连接所述起动机和所述发电机。According to another aspect of the present invention, an automobile is provided, including a starter, a generator, and an automobile electrical system provided in the first aspect of the present application, and the second battery is connected to the starter and the generator.

本发明实施例的技术方案,通过第一隔离电路隔离作用,使得当检测到直流转换器的一侧发生电压突变时,关断对应的第一隔离器件,使得直流转换器一侧的波动电压不会影响到直流转换器另外一侧的电网中。In the technical solution of the embodiment of the present invention, through the isolation effect of the first isolation circuit, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the fluctuating voltage on one side of the DC converter does not change. It will affect the grid on the other side of the DC converter.

应当理解,本部分所描述的内容并非旨在标识本发明的实施例的关键或重要特征,也不用于限制本发明的范围。本发明的其它特征将通过以下的说明书而变得容易理解。It should be understood that the content described in this section is not intended to identify key or critical features of the embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become readily understood from the following description.

附图说明Description of drawings

为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

图1是根据本发明实施例一提供的一种汽车电气系统的系统架构图;1 is a system architecture diagram of an automotive electrical system provided according to Embodiment 1 of the present invention;

图2是根据本发明实施例二所适用的一种汽车电气系统的系统架构图;2 is a system architecture diagram of an automotive electrical system to which Embodiment 2 of the present invention is applicable;

图3是根据本发明实施例三所适用的一种汽车电气系统的系统架构图;3 is a system architecture diagram of an automotive electrical system to which Embodiment 3 of the present invention is applicable;

图4为实施例三中所适用的一种汽车电气系统的第一隔离电路和第二隔离电路的具体连接关系示意图;4 is a schematic diagram of a specific connection relationship between a first isolation circuit and a second isolation circuit of an automotive electrical system applicable in Embodiment 3;

图5是根据本发明实施例四提供的一种汽车电气系统的一种系统架构示意图;5 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 4 of the present invention;

图6是根据本发明实施例五提供的一种汽车电气系统的一种系统架构示意图;6 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 5 of the present invention;

图7是根据本发明实施例六提供的一种汽车电气系统的一种系统架构示意图。FIG. 7 is a schematic diagram of a system architecture of an automotive electrical system according to Embodiment 6 of the present invention.

具体实施方式Detailed ways

为了使本技术领域的人员更好地理解本发明方案,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分的实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都应当属于本发明保护的范围。In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

需要说明的是,本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换,以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外,术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,例如,包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。It should be noted that the terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

实施例一Example 1

图1为本发明实施例一提供了一种汽车电气系统的系统架构图,本实施例可适用于汽车的电控系统中。如图1所示,该系统包括:FIG. 1 is a system architecture diagram of an automotive electrical system provided in Embodiment 1 of the present invention, and this embodiment can be applied to an electric control system of an automobile. As shown in Figure 1, the system includes:

至少两个电池,至少两个电池包括第一电池1和第二电池2,汽车电气系统还包括直流转换器3和第一隔离电路4;At least two batteries, the at least two batteries include a first battery 1 and a second battery 2, and the automotive electrical system also includes a DC converter 3 and a first isolation circuit 4;

第一隔离电路4的第一端连接第一电池1,第一隔离电路4的第二端连接直流转换器3的第一侧;第二电池2连接直流转换器3的第二侧;The first end of the first isolation circuit 4 is connected to the first battery 1, the second end of the first isolation circuit 4 is connected to the first side of the DC converter 3; the second battery 2 is connected to the second side of the DC converter 3;

具体的,由图1可知,第一电池1连接第一隔离电路4的第一端;直流转换器3的第一侧连接第一隔离电路4的第二端和的第二端;第二电池2连接直流转换器3的第二侧,使得第二电池2的电压可以通过直流转换器3进行转换,得到可以用于为用电设备进行供电的电压。Specifically, it can be seen from FIG. 1 that the first battery 1 is connected to the first end of the first isolation circuit 4; the first side of the DC converter 3 is connected to the second end and the second end of the first isolation circuit 4; the second battery 2 is connected to the second side of the DC converter 3, so that the voltage of the second battery 2 can be converted by the DC converter 3 to obtain a voltage that can be used to supply power to electrical equipment.

第一隔离电路4包括至少一个第一隔离器件,用于当检测到直流转换器3的一侧发生电压突变时,关断对应的第一隔离器件,使得直流转换器3的第一侧和第二侧之间的电压隔离。The first isolation circuit 4 includes at least one first isolation device, which is used to turn off the corresponding first isolation device when it is detected that a voltage mutation occurs on one side of the DC converter 3, so that the first side of the DC converter 3 is connected to the first isolation device. Voltage isolation between the two sides.

具体的,第一隔离电路4可以包括至少一个第一隔离器件,用于及时对该电路进行导通和断开,例如,当车辆正常运行时,直流转换器3两侧的电压平稳,可以控制第一隔离电路4为导通状态,使得第一电池1和第二电池2都可以为用电设备进行供电。直流转换器3第一侧的电网因为用电设备的启动而出现电压下降时,此时,第二电池2可以通过直流转换器3的电压转换为用电设备提供稳定的供电。Specifically, the first isolation circuit 4 may include at least one first isolation device, which is used to turn on and off the circuit in time. For example, when the vehicle is running normally, the voltage on both sides of the DC converter 3 is stable and can be controlled The first isolation circuit 4 is in a conducting state, so that both the first battery 1 and the second battery 2 can supply power to the electrical equipment. When the voltage of the power grid on the first side of the DC converter 3 drops due to the startup of the electrical equipment, the second battery 2 can convert the voltage of the DC converter 3 to provide stable power supply for the electrical equipment.

另外,当直流转换器3的一侧的电网发生负载开关断开或者产生高电压脉冲时,会产生突变电压,而为了避免直流转换器3一侧的电压传递到直流转换器3的另一侧,可以将第一隔离电路4断开,使得直流转换器3的第一侧和第二侧之间的电压隔离。In addition, when the load switch on one side of the DC converter 3 is disconnected or a high voltage pulse is generated, a sudden voltage will be generated, and in order to prevent the voltage on one side of the DC converter 3 from being transferred to the other side of the DC converter 3 , the first isolation circuit 4 can be disconnected so that the voltage between the first side and the second side of the DC converter 3 is isolated.

本发明实施例的技术方案,通过第一隔离电路隔离作用,使得当检测到直流转换器的一侧发生电压突变时,关断对应的第一隔离器件,使得直流转换器一侧的波动电压不会影响到直流转换器另外一侧的电网中。In the technical solution of the embodiment of the present invention, through the isolation effect of the first isolation circuit, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the fluctuating voltage on one side of the DC converter does not change. It will affect the grid on the other side of the DC converter.

实施例二Embodiment 2

图2为本发明实施例二提供的一种汽车电气系统的系统架构图,本实施例在实施例一的基础上进一步的公开了第二个隔离电路。如图2所示,该系统中还包括第二隔离电路5。FIG. 2 is a system architecture diagram of an automotive electrical system according to Embodiment 2 of the present invention. Based on Embodiment 1, this embodiment further discloses a second isolation circuit. As shown in FIG. 2 , the system also includes a second isolation circuit 5 .

第二隔离电路5包括至少一个第二隔离器件,用于阻断第二隔离电路5一侧的电流流入到第二隔离电路5的另一侧,同时使得第一电池1和第二电池3均通过第二隔离器件为用电设备供电。The second isolation circuit 5 includes at least one second isolation device, which is used to block the current on one side of the second isolation circuit 5 from flowing into the other side of the second isolation circuit 5, and simultaneously make the first battery 1 and the second battery 3 both The powered device is powered through the second isolation device.

具体的,第二隔离电路5可以包括至少一个隔离器件,第二隔离电路5的第一端连接第一电池1,第二端连接直流转换器3的第一端,第三端连接用电设备。第二隔离电路5可以阻断直流转换器3一侧的电压传递到直流转换器3的另一侧。如果不存在第二隔离电路5时,当直流转换器3的任一侧发生对地短路时,电流可以直接流入到对地的一侧,那么第一电池1和第二电池2都将无法为用电设备进行供电。Specifically, the second isolation circuit 5 may include at least one isolation device, the first end of the second isolation circuit 5 is connected to the first battery 1 , the second end is connected to the first end of the DC converter 3 , and the third end is connected to the electrical equipment . The second isolation circuit 5 can block the transfer of the voltage on one side of the DC converter 3 to the other side of the DC converter 3 . If there is no second isolation circuit 5, when either side of the DC converter 3 is short-circuited to ground, the current can flow directly to the ground side, then the first battery 1 and the second battery 2 will not be able to Powered by electrical equipment.

另外,第二隔离电路5中的第二隔离器件也可以分别为第一电池1和第二电池2提供一个导通的功能,使得第一电池1和第二电池2可以分别为用电设备进行供电。如果第一隔离电路4发生开路故障时,第一电池1和第二电池2也可以为用电设备进行供电,从而能够延长车辆相关电器运行的时间,以方便车辆和驾驶者采取对应的措施,而不是突然的断电带来的紧急事故。In addition, the second isolation device in the second isolation circuit 5 can also provide a conduction function for the first battery 1 and the second battery 2 respectively, so that the first battery 1 and the second battery 2 can be used for electrical equipment respectively. powered by. If an open-circuit fault occurs in the first isolation circuit 4, the first battery 1 and the second battery 2 can also supply power to the electrical equipment, so that the running time of the related electrical appliances of the vehicle can be prolonged, so as to facilitate the vehicle and the driver to take corresponding measures, Rather than an emergency caused by a sudden power outage.

本实施例通过第二隔离电路阻断第二隔离电路一侧的电流流入到第二隔离电路的另一侧,起到短路保护的作用;并且第二隔离电路还可以起到供电导通作用,使得第一电池和第二电池能够通过第二隔离电路的第二隔离器件为用电设备供电。In this embodiment, the current on one side of the second isolation circuit is blocked from flowing into the other side of the second isolation circuit by the second isolation circuit, so as to play the role of short-circuit protection; and the second isolation circuit can also play the role of power supply conduction, The first battery and the second battery can supply power to the electrical equipment through the second isolation device of the second isolation circuit.

实施例三Embodiment 3

图3为本发明实施例二提供的一种汽车电气系统的系统架构图,本实施例在上述实施例的基础上进一步的公开了第一隔离电路和第二个隔离电路的具体结构。如图3所示,该系统中的第一个隔离电路具体包括:FIG. 3 is a system architecture diagram of an automotive electrical system according to Embodiment 2 of the present invention. This embodiment further discloses the specific structures of the first isolation circuit and the second isolation circuit on the basis of the foregoing embodiment. As shown in Figure 3, the first isolation circuit in the system specifically includes:

串联的第一电子开关41和第二电子开关42;第一电子开关41和第二电子开关42互为反向的连接。The first electronic switch 41 and the second electronic switch 42 are connected in series; the first electronic switch 41 and the second electronic switch 42 are connected in opposite directions.

需要说明的是,本实施例中采用的第一电子开关和第二电子开关的具体的结构相同,均包括MOS管和第三二极管,MOS管的栅极与直流转换器的控制侧相连,源极连接第三二极管的正极,漏极连接第三二极管的负极。It should be noted that the specific structures of the first electronic switch and the second electronic switch used in this embodiment are the same, and both include a MOS tube and a third diode, and the gate of the MOS tube is connected to the control side of the DC converter , the source is connected to the anode of the third diode, and the drain is connected to the cathode of the third diode.

其中,第一电子开关41和第二电子开关42为互为反向的连接,具体包含两种情况。第一种情况包括:第一电子开关41的第三二极管的正极与第二电子开关42的第三二极管的正极相连,同样第一电子开关41中MOS管的源极与第二电子开关42中MOS管的源极相连。第二种情况包括:第一电子开关41的第三二极管的负极与第二电子开关42的第三二极管的负相连,同样第一电子开关41中MOS管的漏极与第二电子开关42中MOS管的漏极相连。这两种情况都能使第一电子开关41和第二电子开关42在关断时,第一隔离电路处于关断状态。Wherein, the first electronic switch 41 and the second electronic switch 42 are mutually inversely connected, specifically including two cases. The first case includes: the anode of the third diode of the first electronic switch 41 is connected to the anode of the third diode of the second electronic switch 42, and the source of the MOS transistor in the first electronic switch 41 is also connected to the second electronic switch 42. The sources of the MOS transistors in the electronic switch 42 are connected to each other. The second case includes: the negative electrode of the third diode of the first electronic switch 41 is connected to the negative electrode of the third diode of the second electronic switch 42, and the drain of the MOS transistor in the first electronic switch 41 is also connected to the second electronic switch 42. The drains of the MOS transistors in the electronic switch 42 are connected to each other. In both cases, when the first electronic switch 41 and the second electronic switch 42 are turned off, the first isolation circuit is in an off state.

具体的,如图4所示的第一隔离电路和第二隔离电路的连接方式,第一电子开关41中MOS管的漏极与直流转换器3的第一侧相连,第一电子开关41中MOS管的源极和第二电子开关42中MOS管的源极相连,第二电子开关42中MOS管的漏极与第一电池1相连,使得当第一电子开关41和第二电子开关42在都关断时,第一隔离电路4处于关断状态;当第一电子开关41导通,第二电子开关42关断时,从直流转换器3流向第一隔离电路4的电流可以通过,而从第一电池1流向第一隔离电路4的电流不能通过;当第二电子开关42导通,第一电子开关41关断时,从直流转换器3流向第一隔离电路4的电流不能通过,而从第一电池1流向第一隔离电路4的电流可以通过;当第一电子开关41和第二电子开关42在都导通时,第一隔离电路则处于双向导通状态。当采用另外一种连接方式时,即第一电子开关42中MOS管的源极与直流转换器3的第一侧相连,第一电子开关41中MOS管的漏极和第二电子开关42中MOS管的漏极相连,第二电子开关42中MOS管的源极与第一电池1相连时,则当第一电子开关41和第二电子开关42在都关断时,第一隔离电路4处于关断状态;当第一电子开关41导通,第二电子开关42关断时,从直流转换器3流向第一隔离电路4的电流不能通过,而从第一电池1流向第一隔离电路4的电流可以通过;当第二电子开关导通,第一电子开关41关断时,从直流转换器3流向第一隔离电路4的电流可以通过,而从第一电池1流向第一隔离电路4的电流不能通过;当第一电子开关41和第二电子开关42在都导通时,第一隔离电路则处于双向导通状态。Specifically, as shown in the connection mode of the first isolation circuit and the second isolation circuit shown in FIG. 4 , the drain of the MOS transistor in the first electronic switch 41 is connected to the first side of the DC converter 3 , in the first electronic switch 41 The source of the MOS tube is connected to the source of the MOS tube in the second electronic switch 42, and the drain of the MOS tube in the second electronic switch 42 is connected to the first battery 1, so that when the first electronic switch 41 and the second electronic switch 42 When both are turned off, the first isolation circuit 4 is in an off state; when the first electronic switch 41 is turned on and the second electronic switch 42 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 can pass through, The current flowing from the first battery 1 to the first isolation circuit 4 cannot pass through; when the second electronic switch 42 is turned on and the first electronic switch 41 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 cannot pass through , and the current flowing from the first battery 1 to the first isolation circuit 4 can pass; when both the first electronic switch 41 and the second electronic switch 42 are turned on, the first isolation circuit is in a bidirectional conduction state. When another connection method is adopted, that is, the source of the MOS transistor in the first electronic switch 42 is connected to the first side of the DC converter 3 , the drain of the MOS transistor in the first electronic switch 41 is connected to the drain of the MOS transistor in the second electronic switch 42 . When the drain of the MOS tube is connected, and the source of the MOS tube in the second electronic switch 42 is connected to the first battery 1, then when the first electronic switch 41 and the second electronic switch 42 are both turned off, the first isolation circuit 4 In the off state; when the first electronic switch 41 is turned on and the second electronic switch 42 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 cannot pass through, but flows from the first battery 1 to the first isolation circuit 4 can pass through; when the second electronic switch is turned on and the first electronic switch 41 is turned off, the current flowing from the DC converter 3 to the first isolation circuit 4 can pass through, and from the first battery 1 to the first isolation circuit 4 cannot pass through; when both the first electronic switch 41 and the second electronic switch 42 are turned on, the first isolation circuit is in a bidirectional conduction state.

本申请中,在汽车电汽系统正常运行时,第一电子开关41和第二电子开关42都处于导通状态,此时,电流均可以通过第一电子开关41和第二电子开关42中的MOS管,使得避免电气系统中出现大电流时造成的第一电子开关41和第二电子开关42中的二极管发热过量。In the present application, when the electric vehicle system of the vehicle is in normal operation, both the first electronic switch 41 and the second electronic switch 42 are in the conducting state. At this time, the current can pass through the first electronic switch 41 and the second electronic switch 42 The MOS transistor is used to avoid excessive heating of the diodes in the first electronic switch 41 and the second electronic switch 42 when a large current occurs in the electrical system.

另外,由于MOS管的栅极与直流转换器的控制侧相连,可以使得当直流转换器的一侧发生电压突变时,直流转换器可以控制对应的电子开关,使得直流转换器的第一侧和第二侧之间的电压隔离。例如,当车辆运行,第一电池提供的12V侧的电压因为12V用电设备的开启,导致电压下降时(比如低于12.5V),直流转换器可以发送控制信号至第一电子开关和第一电子开关的MOS管的栅极,第一电子开关和第二电子开关都受控导通,此时第二电池提供的24V的电压经过直流转换器的降压功能,输送12.5V电压给到12V低压侧,以保持低压侧的12.5V稳定供电;如果当12V用电网发生负载开关断开,产生电压突变的时候,比如产生了反向的-4V电压,当直流转换器检测到负向电压后,将发送控制信号给到第二电子开关的栅极,使得第二电子开关关断,使得低压侧的-4V电压就不会传送到直流转换器内部和高压24V侧。In addition, since the gate of the MOS tube is connected to the control side of the DC converter, when a sudden change of voltage occurs on one side of the DC converter, the DC converter can control the corresponding electronic switch, so that the first side of the DC converter and the Voltage isolation between the second sides. For example, when the vehicle is running, when the voltage on the 12V side provided by the first battery drops due to the turn-on of the 12V electrical equipment (for example, lower than 12.5V), the DC converter can send a control signal to the first electronic switch and the first electronic switch. The gate of the MOS tube of the electronic switch, the first electronic switch and the second electronic switch are controlled to be turned on. At this time, the 24V voltage provided by the second battery passes through the step-down function of the DC converter, and delivers 12.5V to 12V The low-voltage side is used to maintain the stable power supply of 12.5V on the low-voltage side; if the load switch of the 12V power grid is disconnected, resulting in a sudden voltage change, such as a reverse -4V voltage, when the DC converter detects a negative voltage Then, a control signal is sent to the gate of the second electronic switch, so that the second electronic switch is turned off, so that the -4V voltage on the low voltage side will not be transmitted to the inside of the DC converter and the high voltage 24V side.

同样的,如果在第二电池2产生的24V高压侧耦合产生的高电压脉冲,也有可能会产生高于15V的高电压到直流转换器3的低压侧,当直流转换器3检测到高电压时,可以发送控制信号到第一电子开关中MOS管的栅极,使得控制第一电子开关断开,那么高电压将不会传递至低压侧电网中。Similarly, if the high voltage pulse generated by the 24V high voltage side generated by the second battery 2 is coupled, it is also possible to generate a high voltage higher than 15V to the low voltage side of the DC converter 3. When the DC converter 3 detects a high voltage , a control signal can be sent to the gate of the MOS transistor in the first electronic switch, so that the first electronic switch is controlled to be turned off, so that the high voltage will not be transmitted to the low-voltage side power grid.

在一种具体的实施方式中,第二隔离电路包括第一二极管和第二二极管;In a specific embodiment, the second isolation circuit includes a first diode and a second diode;

第一二极管的正极连接直流转换器的第一端,第一二极管的负极连接第二二极管的负极,第二二极管的正极连接第一电池。The anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery.

需要说明的是,本申请通过第一二极管的正极连接直流转换器的第一端,第一二极管的负极连接第二二极管的负极,第二二极管的正极连接第一电池的连接方式,使得阻断第二隔离电路5一侧的电流流入到第二隔离电路5的另一侧。It should be noted that in this application, the anode of the first diode is connected to the first end of the DC converter, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first end of the DC converter. The battery is connected in such a way that the current on one side of the second isolation circuit 5 is blocked from flowing into the other side of the second isolation circuit 5 .

具体的,如果靠近第一电池1或者靠近第二电池2的任一侧出现对地短路故障时,因为存在第一二极管和第二二极管,其单向导通特性使得第一电池或者第二电池产生的电流不会从第二隔离电路5的一侧流向另外一侧,从而实现短路保护的作用。而如果不存在第一二极管和第二二极管,则会出现第二隔离电路5一侧的电流会流向另外一侧,此时第一电池1或者第二电池2直接接地,从而不能够为用电设备进行供电。Specifically, if a short-to-ground fault occurs on either side near the first battery 1 or near the second battery 2, due to the existence of the first diode and the second diode, the unidirectional conduction characteristics of the first battery or The current generated by the second battery will not flow from one side of the second isolation circuit 5 to the other side, so as to achieve the function of short circuit protection. However, if the first diode and the second diode do not exist, the current on one side of the second isolation circuit 5 will flow to the other side. At this time, the first battery 1 or the second battery 2 is directly grounded, so that the Can supply power to electrical equipment.

在一种具体的实施方式中,第一二极管和第二二极管的负极均连接保险丝的一端,保险丝的另一端连接用电设备。In a specific embodiment, the cathodes of the first diode and the second diode are both connected to one end of the fuse, and the other end of the fuse is connected to the electrical equipment.

需要说明的是,由于第一二极管的正极连接直流转换器的第一端,第二二极管的正极连接第一电池,且第一二极管和第二二极管的负极均连接保险丝的一端,保险丝的另一端连接用电设备,使得第一电池1和第二电池2均可以通过二极管为用电设备进行供电。例如,如图4所示的电路图,当第一电子开关41出现开路故障时,此时,第二电源2产生的电能将不能传送到用电设备,而由于第一二极管和第二二极管的存在,使得第一电源1仍能够正常为用电设备进行供电;同样的,当第二电子开关42出现开路故障时,此时,第一电源1产生的电能将不能传送到用电设备,而由于第一二极管和第二二极管的存在,使得第二电源2仍能够正常为用电设备进行供电;从而能够延长车辆相关电器运行的时间,以方便车辆和驾驶者采取对应的措施,而不是突然的断电带来的紧急事故,保证了紧急事件数据记录盒、汽车电控器等用电设备的安全性。It should be noted that since the anode of the first diode is connected to the first end of the DC converter, the anode of the second diode is connected to the first battery, and the cathodes of the first diode and the second diode are both connected One end of the fuse and the other end of the fuse are connected to the electrical equipment, so that both the first battery 1 and the second battery 2 can supply power to the electrical equipment through a diode. For example, as shown in the circuit diagram in FIG. 4, when the first electronic switch 41 has an open-circuit fault, at this time, the power generated by the second power supply 2 will not be transmitted to the electrical equipment, and due to the first diode and the second two The existence of the pole tube enables the first power supply 1 to still supply power to the electrical equipment normally; similarly, when the second electronic switch 42 has an open-circuit fault, at this time, the electrical energy generated by the first power supply 1 will not be transmitted to the electrical equipment. Due to the existence of the first diode and the second diode, the second power supply 2 can still supply power to the electrical equipment normally; thus, the running time of the vehicle-related electrical appliances can be prolonged, so as to facilitate the vehicle and the driver to take The corresponding measures, rather than the emergency caused by the sudden power failure, ensure the safety of the electrical equipment such as the emergency data record box and the automobile electronic controller.

在一种具体的实施方式中,第一电池1的供电电压小于第二电池的供电电压。In a specific embodiment, the supply voltage of the first battery 1 is lower than the supply voltage of the second battery.

具体的,第一电池为12V供电电池,第二电池2为24V供电电池,第一电池1和第二电池2为锂电池。Specifically, the first battery is a 12V power supply battery, the second battery 2 is a 24V power supply battery, and the first battery 1 and the second battery 2 are lithium batteries.

需要说明的是,本发明第一电池1采用12V锂电池,第二电池2采用24V锂电池,12V锂电池主要连接低压供电设备,用于为低压用电设备进行供电。而24V锂电池连接可以连接起动机和发电机,用来起动内燃机,从而启动汽车,以及通过内燃机的前端驱动系统-驱动皮带轮得到机械能,再转换为24V的直流电,并输送到24V锂电池电池进行储存;由于12V锂电池在低温下掉电会比较大,因此,12V的锂电池很难作为低温下起动机的启动电源,因此,本发明可以采用24V锂电池作为起动机的启动电源,而12V的锂电池成本更低,因此可以采用12V的锂电池用于为12V用电设备进行供电。本发明中的用电设备可以包括紧急事件数据记录盒EDR、12V用电器以及汽车电控器ECU(电控器用于控制车辆行驶-发动机,变速器和刹车等的控制器)等。It should be noted that the first battery 1 of the present invention adopts a 12V lithium battery, the second battery 2 adopts a 24V lithium battery, and the 12V lithium battery is mainly connected to a low-voltage power supply device for supplying power to a low-voltage electrical device. The 24V lithium battery connection can connect the starter and generator to start the internal combustion engine, thereby starting the car, and obtain mechanical energy through the front-end drive system of the internal combustion engine - the drive pulley, which is then converted into 24V direct current and sent to the 24V lithium battery. Storage; since the 12V lithium battery will lose power at low temperature, it is difficult to use the 12V lithium battery as the starting power for the starter at low temperature. Therefore, the present invention can use the 24V lithium battery as the starting power for the starter, while the 12V lithium battery The cost of lithium batteries is lower, so 12V lithium batteries can be used to power 12V electrical equipment. The electrical equipment in the present invention may include an emergency event data recording box EDR, a 12V electrical appliance, and an automotive electronic controller ECU (the electronic controller is used to control the driving of the vehicle - the controller of the engine, transmission and brake, etc.) and the like.

本发明实施例的技术方案,通过第一电子开关41和第二电子开关42的隔离作用,使得当检测到直流转换器的一侧发生电压突变时,关断对应的第一隔离器件,使得直流转换器一侧的波动电压不会影响到直流转换器另外一侧的电网中,从而避免用电器对电网造成的波动带给电控器带来不利影响。通过第一二极管和第二二极管组成的第二隔离电路阻断第二隔离电路一侧的电流流入到第二隔离电路的另一侧,起到短路保护的作用;并且第一二极管和第二二极管的单向导通作用还可以另第一电池和第二电池都能为用电设备进行供电,使得保证了用电设备的用电安全。In the technical solution of the embodiment of the present invention, through the isolation function of the first electronic switch 41 and the second electronic switch 42, when a sudden change in voltage on one side of the DC converter is detected, the corresponding first isolation device is turned off, so that the DC The fluctuating voltage on one side of the converter will not affect the power grid on the other side of the DC converter, so as to avoid the adverse effects on the electronic controller caused by the fluctuation of the electrical appliance on the power grid. The second isolation circuit composed of the first diode and the second diode blocks the current on one side of the second isolation circuit from flowing into the other side of the second isolation circuit, so as to play the role of short-circuit protection; The unidirectional conduction effect of the pole tube and the second diode can also enable both the first battery and the second battery to supply power to the electrical equipment, so as to ensure the electrical safety of the electrical equipment.

实施例四Embodiment 4

图5为本发明实施例三提供的一种汽车电气系统的系统架构图。如图5所示,该系统中的第一隔离电路包括一个第三电子开关43,第三电子开关43的一端连接直流转换器3的第一端,另一端连接第一电池1。其中,第二隔离电路5的结构和实施例三的第二隔离电路5的结构一致,包括第一二极管和第二二极管,第一二极管的正极连接直流转换器3的第一端,第一二极管的负极连接第二二极管的负极,第二二极管的正极连接第一电池1。FIG. 5 is a system architecture diagram of an automotive electrical system according to Embodiment 3 of the present invention. As shown in FIG. 5 , the first isolation circuit in the system includes a third electronic switch 43 , one end of the third electronic switch 43 is connected to the first end of the DC converter 3 , and the other end is connected to the first battery 1 . The structure of the second isolation circuit 5 is the same as that of the second isolation circuit 5 in the third embodiment, including a first diode and a second diode, and the anode of the first diode is connected to the first diode of the DC converter 3 . At one end, the cathode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is connected to the first battery 1 .

本实施例仅设置一个第三电子开关43时,由于电子开关中二极管的朝向设置会使第一电池1或者第二电池2产生的电流流向另外一侧。例如,如图3所示,第三电子开关43中的二极管的正极连接第一电池1,使得第一电池1产生的电流能够通过第三电子开关43流向直流转换器3,这种连接方式仅可以保护第一电池1供电侧的稳定运行。同样的,如果第三电子开关43中的二极管的正极连接直流转换器3,则第二电池2产生的电流经过直流转换器3后能够流向第一电池1,使得可以保护直流转换器3以及第二电池2供电侧的稳定运行。When only one third electronic switch 43 is provided in this embodiment, the current generated by the first battery 1 or the second battery 2 flows to the other side due to the orientation of the diode in the electronic switch. For example, as shown in FIG. 3 , the anode of the diode in the third electronic switch 43 is connected to the first battery 1 , so that the current generated by the first battery 1 can flow to the DC converter 3 through the third electronic switch 43 . The stable operation of the power supply side of the first battery 1 can be protected. Similarly, if the anode of the diode in the third electronic switch 43 is connected to the DC converter 3, the current generated by the second battery 2 can flow to the first battery 1 after passing through the DC converter 3, so that the DC converter 3 and the second battery can be protected. The stable operation of the power supply side of the second battery 2.

实施例五Embodiment 5

图6为本发明实施例四提供的一种汽车电气系统的系统架构图。如图4所示,该系统中的第一隔离电路4包括至少一个保险丝,保险丝的一端连接直流转换器3的第一侧,另一端连接第一电池1,其中,第二隔离电路5的结构不变,包括第一二极管和第二二极管,第一二极管的正极连接直流转换器3的第一端,第一二极管的负极连接第二二极管的负极,第二二极管的正极连接第一电池1。FIG. 6 is a system architecture diagram of an automotive electrical system according to Embodiment 4 of the present invention. As shown in FIG. 4 , the first isolation circuit 4 in the system includes at least one fuse, one end of the fuse is connected to the first side of the DC converter 3 , and the other end is connected to the first battery 1 , wherein the structure of the second isolation circuit 5 is The same, including a first diode and a second diode, the anode of the first diode is connected to the first end of the DC converter 3, the cathode of the first diode is connected to the cathode of the second diode, the The anodes of the two diodes are connected to the first battery 1 .

本实施例对第一电子开关和第二电子开关的设置进行了简化,采用保险丝代替了第一电子开关和第二电子开关,使得当电路发生故障的情况下,保险丝可以在线路电流过大时自动断开,使得保护了整个电网的安全性,断开后,第一电池和第二电池仍能够通过第一二极管和第二二极管为用电设备供电。This embodiment simplifies the settings of the first electronic switch and the second electronic switch, and uses a fuse to replace the first electronic switch and the second electronic switch, so that when the circuit fails, the fuse can be used when the line current is too large. The automatic disconnection protects the safety of the entire power grid. After disconnection, the first battery and the second battery can still supply power to the electrical equipment through the first diode and the second diode.

实施例六Embodiment 6

图7为本发明实施例五提供的一种汽车电气系统的系统架构图。如图4所示,该系统中第一隔离电路包括串联的第一电子开关41和第二电子开关42;第一电子开关41和第二电子开关42互为反向的连接,该方案不包括第二隔离电路。FIG. 7 is a system architecture diagram of an automotive electrical system according to Embodiment 5 of the present invention. As shown in FIG. 4 , the first isolation circuit in the system includes a first electronic switch 41 and a second electronic switch 42 connected in series; the first electronic switch 41 and the second electronic switch 42 are connected in opposite directions, and this solution does not include The second isolation circuit.

具体结构可以如图7所示,第一电子开关41中的MOS管的源极连接第二电子开关42的源极和多个保险丝,保险丝的另一端连接用电器;第一电子开关41中的MOS管的漏极连接直流转换器。The specific structure can be shown in FIG. 7 , the source of the MOS tube in the first electronic switch 41 is connected to the source of the second electronic switch 42 and a plurality of fuses, and the other end of the fuse is connected to the electrical appliance; The drain of the MOS tube is connected to the DC converter.

该实施例可以通过直流转换器控制第一电子开关41和第二电子开关,42使得第一隔离电路4一侧的波动电压不会对第一隔离电路4另一侧产生影响。并且还能控制第一电源1或者第二电源2为多个用电设备进行供电。In this embodiment, the first electronic switch 41 and the second electronic switch 42 can be controlled by the DC converter, so that the fluctuating voltage on one side of the first isolation circuit 4 will not affect the other side of the first isolation circuit 4 . In addition, the first power supply 1 or the second power supply 2 can also be controlled to supply power to a plurality of electrical devices.

本申请还提供了一种汽车的实施例,汽车包括起动机、发电机以及本申请上述实施例中提供的汽车电气系统,第二电池连接起动机和发电机。The present application also provides an embodiment of an automobile. The automobile includes a starter, a generator, and the automobile electrical system provided in the above embodiments of the present application, and the second battery is connected to the starter and the generator.

具体的,第二电池2可以连接起动机和发电机,用来起动内燃机,从而启动汽车,以及通过内燃机的前端驱动系统-驱动皮带轮得到机械能,再转换为直流电,并输送到第二电池2进行储存。Specifically, the second battery 2 can be connected to a starter and a generator to start the internal combustion engine, thereby starting the car, and to obtain mechanical energy through the front-end drive system of the internal combustion engine—the drive pulley, which is then converted into direct current and sent to the second battery 2 for processing. store.

上述具体实施方式,并不构成对本发明保护范围的限制。本领域技术人员应该明白的是,根据设计要求和其他因素,可以进行各种修改、组合、子组合和替代。任何在本发明的精神和原则之内所作的修改、等同替换和改进等,均应包含在本发明保护范围之内。The above-mentioned specific embodiments do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An automotive electrical system, comprising: the automobile electric system also comprises a direct current converter and a first isolation circuit;
the first end of the first isolation circuit is connected with the first battery, and the second end of the first isolation circuit is connected with the first side of the direct current converter; the second battery is connected with the second side of the direct current converter;
the first isolation circuit comprises at least one first isolation device and is used for turning off the corresponding first isolation device when voltage abrupt change of one side of the direct current converter is detected, so that voltage isolation between the first side and the second side of the direct current converter is realized.
2. The automotive electrical system of claim 1, further comprising a second isolation circuit, wherein a first end of the second isolation circuit is connected to the first battery, a second end of the second isolation circuit is connected to the first side of the dc converter, and a third end of the second isolation circuit is connected to a plurality of electrical devices;
the second isolation circuit comprises at least one second isolation device and is used for blocking current on one side of the second isolation circuit from flowing into the other side of the second isolation circuit, and meanwhile, the first battery and the second battery are enabled to supply power to electric equipment through the second isolation device.
3. The automotive electrical system of any of claims 1-2, wherein the first isolation circuit comprises a first electronic switch and a second electronic switch in series; the first electronic switch and the second electronic switch are connected in a reverse direction.
4. The automotive electrical system of claim 3, wherein the first electronic switch and the second electronic switch each comprise a MOS transistor and a third diode, the MOS transistor having a gate connected to the control side of the DC converter, a source connected to the anode of the third diode, and a drain connected to the cathode of the third diode.
5. The automotive electrical system of claim 2, wherein the second isolation circuit comprises a first diode and a second diode;
the positive pole of the first diode is connected with the first end of the direct current converter, the negative pole of the first diode is connected with the negative pole of the second diode, and the positive pole of the second diode is connected with the first battery.
6. The automotive electrical system of claim 5, wherein the cathodes of the first and second diodes are connected to one end of a fuse, and the other end of the fuse is connected to an electrical device.
7. The automotive electrical system of claim 1, wherein the first isolation circuit includes a third electronic switch having one terminal connected to the first terminal of the dc converter and another terminal connected to the first battery.
8. The automotive electrical system of claim 1, wherein the first isolation circuit comprises at least one fuse having one end connected to a first end of the dc converter and another end connected to the first battery.
9. The automotive electrical system of claim 1, wherein the supply voltage of the first battery is less than the supply voltage of the second battery; the first battery is a 12V power supply battery, the second battery is a 24V power supply battery, and the first battery and the second battery are lithium batteries.
10. An automobile comprising a starter, a generator and the automobile electrical system of any one of claims 1-9, wherein the second battery connects the starter and the generator.
CN202210276772.2A 2022-03-21 2022-03-21 Automobile electrical system and automobile Active CN114475484B (en)

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