A low voltage power supply system for an automobile

Abstract

The application discloses a low-voltage power supply system for a vehicle, which comprises an overcurrent protection module and an emergency current-limiting power supply module. By setting the overcurrent protection module and the emergency current-limiting power supply module, if the overcurrent protection module connected with an electric appliance is connected in parallel with the emergency current-limiting power supply module, when the overcurrent protection module is disconnected, the emergency current-limiting power supply module will also connect the electric appliance with the power module, so that the electric appliance will not immediately lose the power supply of the power module, so that the electric appliance can still play its function, and the functions of important electric appliances such as brakes and lighting systems can be completely lost at a moment, time can be provided for the driver to deal with the fault, and the driving safety of the vehicle is ensured; since the electric appliance can be prevented from immediately losing the power supply of the power module, the load of the power module can also be prevented from suddenly changing, the working stability of the power module can be ensured, and the safety of the vehicle-mounted equipment can be ensured. The application is widely applied in the technical field of vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a low-voltage power supply system for automobiles. Background Art

[0002] There are many electrical appliances in a car. Electric energy is output by power sources such as batteries and generators, and is provided to the electrical appliances through the power supply system, so that the electrical appliances can perform their functions.

[0003] Currently, the wiring structure between the power supply and electrical appliances in a car is as follows: each appliance is connected in series with a fuse, which is then connected in parallel to the appliance and the ground wire. In the event of an electrical overload or short circuit, the fuse cuts off the connection between the appliance and the power supply by melting, preventing excessive current from burning out the appliance or power supply, thus ensuring vehicle safety.

[0004] However, some electrical appliances are closely related to vehicle safety, but current low-voltage power supply technology in vehicles can easily pose safety risks to these appliances. For example, a vehicle's brakes provide braking force. If a fuse connected to the brakes blows, causing the brakes to lose power and fail to provide braking force while the vehicle is traveling at high speed, this can put the vehicle and other road users at significant risk. A vehicle's lighting system provides good visibility for the driver. If a fuse connected to the lighting system blows, causing the lighting system to lose power and fail to illuminate at night, it could lead to dangerous situations such as loss of control. Furthermore, with current low-voltage power supply technology, a blown fuse can cause the corresponding onboard appliance to suddenly stop operating. This sudden change in power supply load can cause a strong shock to the power supply, potentially damaging it, or a sudden increase in the current output to other normal electrical appliances, potentially damaging them. Summary of the Invention

[0005] In view of the technical problems existing in the current low-voltage power supply technology for automobiles, such as easy damage to the power supply and electrical appliances or potential driving safety hazards, the purpose of the present invention is to provide a low-voltage power supply system for automobiles.

[0006] An embodiment of the present invention includes a low-voltage power supply system for an automobile, the low-voltage power supply system for an automobile including:

[0007] At least one overcurrent protection module; one end of each of the overcurrent protection modules is connected as a first end, and the other end of each of the overcurrent protection modules is respectively used to be connected to an on-board electrical appliance;

[0008] At least one emergency current limiting power supply module; for any one of the emergency current limiting power supply modules, one end of the emergency current limiting power supply module is connected to one end of the corresponding at least one overcurrent protection module, and the other end of the emergency current limiting power supply module is connected to the other end of the corresponding at least one overcurrent protection module.

[0009] Furthermore, the overcurrent protection module is a fuse.

[0010] Furthermore, the emergency current limiting power supply module includes a current limiting resistor; one end of the current limiting resistor serves as one end of the emergency current limiting power supply module, and the other end of the current limiting resistor serves as the other end of the emergency current limiting power supply module.

[0011] Furthermore, the emergency current limiting power supply module includes a current limiting resistor and an eFuse; one end of the current limiting resistor serves as one end of the emergency current limiting power supply module, the other end of the current limiting resistor is connected to one end of the eFuse, and the other end of the eFuse serves as the other end of the emergency current limiting power supply module.

[0012] Furthermore, the emergency current limiting power supply module includes:

[0013] a current limiting unit; one end of the current limiting unit is connected to the first end;

[0014] A gating unit; the gating unit includes an input end, multiple output ends and a control end, the input end of the gating unit is connected to the other end of the current limiting unit, any output end of the gating unit is connected to the other end of a corresponding overcurrent protection module, the control end of the gating unit is used to receive a gating signal, and the gating unit is used to connect or disconnect the input end and each of the output ends according to the gating signal;

[0015] Control unit; the control unit is used to generate a gating signal and send the gating signal to the control end of the gating unit.

[0016] Furthermore, generating a strobe signal includes:

[0017] Obtaining importance information of each of the electrical appliances;

[0018] Determining a first on / off state corresponding to each of the electrical appliances according to each of the importance information; the first on / off state indicates whether the input terminal of the gating unit is connected or disconnected to the output terminal corresponding to the electrical appliance;

[0019] The strobe signal is generated according to each of the first on-off states.

[0020] Furthermore, determining the first on / off state corresponding to each of the electrical appliances according to each of the importance information includes:

[0021] Setting a first threshold;

[0022] For any of the electrical appliances, when the importance information corresponding to the electrical appliance is greater than the first threshold, the first on-off state corresponding to the electrical appliance is determined to be on; otherwise, the first on-off state corresponding to the electrical appliance is determined to be off.

[0023] Furthermore, generating a strobe signal includes:

[0024] Obtaining the remaining life information of each of the overcurrent protection modules;

[0025] Determining, based on each of the remaining life information, a second on-off state corresponding to each of the overcurrent protection modules; the second on-off state represents a state of connection or disconnection between the input end of the gating unit and the output end corresponding to the overcurrent protection module;

[0026] The strobe signal is generated according to each of the second on-off states.

[0027] Furthermore, determining the second on / off state corresponding to each of the overcurrent protection modules according to the remaining life information includes:

[0028] setting a second threshold;

[0029] For any of the overcurrent protection modules, when the remaining life information corresponding to the overcurrent protection module is less than the second threshold, the second on-off state corresponding to the overcurrent protection module is determined to be on; otherwise, the second on-off state corresponding to the overcurrent protection module is determined to be off.

[0030] Furthermore, the low-voltage power supply system for a vehicle further includes:

[0031] A power supply module; an output end of the power supply module is connected to the first end.

[0032] The beneficial effects of the present invention are as follows: the low-voltage power supply system for automobiles in the embodiment, by setting an overcurrent protection module and an emergency current limiting power supply module, if the overcurrent protection module connected to an electrical appliance is connected in parallel with the emergency current limiting power supply module, then when the overcurrent protection module is disconnected, the emergency current limiting power supply module will also connect the electrical appliance to the power module, so that the electrical appliance will not immediately lose the power supply of the power module, so that the electrical appliance can still perform its function, and can avoid the instantaneous complete loss of functions of highly important electrical appliances such as brakes and lighting systems, thereby providing time for the driver to deal with the fault and ensuring the safety of car driving; moreover, since the electrical appliance can be prevented from immediately losing the power supply of the power module, the sudden load change of the power module can also be avoided, which is conducive to ensuring the stable operation of the power module and thus ensuring the safety of vehicle-mounted equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of a low-voltage power supply system for a vehicle in an embodiment;

[0034] Figure 2 and Figure 3 This is a structural diagram of an emergency current limiting power supply module in an embodiment;

[0035] Figure 4 FIG. 4 is a schematic diagram of another form of a low-voltage power supply system for a vehicle in an embodiment. DETAILED DESCRIPTION

[0036] For electric vehicles, the charge and discharge voltage of their power batteries is generally 200V or higher. Therefore, the power battery, the electric motor powered by the power battery, and the electronic control system are collectively referred to as the vehicle's high-voltage power supply system. Correspondingly, onboard electrical appliances other than the electric motor, such as air conditioners, audio and video entertainment systems, window lifts, and brakes, are generally powered by batteries with lower voltages such as 12V and 48V. Some automotive technologies can also use high-voltage power batteries to power onboard appliances other than the electric motor, but this is generally reduced to 12V or 48V. Therefore, onboard appliances other than the electric motor can be referred to as low-voltage appliances, and the system that powers these low-voltage appliances can be referred to as the low-voltage power supply system.

[0037] For pure fuel vehicles, the above-mentioned high-voltage power supply system generally does not exist. According to the above standards, the system that supplies power to vehicle electrical appliances such as air conditioners, audio and video entertainment systems, window lifts, brakes, etc. can be called a low-voltage power supply system.

[0038] In this embodiment, the low voltage power supply system for the car is as follows Figure 1 or Figure 4 shown.

[0039] Figure 1 It is a form of low-voltage power supply system used in automobiles. Figure 1 A low-voltage power supply system for an automobile includes multiple overcurrent protection modules and multiple emergency current-limiting power supply modules. The number of overcurrent protection modules and the number of emergency current-limiting power supply modules may be equal, or the number of emergency current-limiting power supply modules may be less than the number of overcurrent protection modules. This allows each emergency current-limiting power supply module to be connected in parallel with a corresponding overcurrent protection module, while some overcurrent protection modules may not have an emergency current-limiting power supply module connected in parallel with them.

[0040] In this embodiment, refer to Figure 1 The power module can be a battery, a generator, or a power battery. After the current output from the output end of the power module reaches the first end, it flows along each overcurrent protection module to each electrical appliance, thereby providing power to each electrical appliance.

[0041] For example, refer to Figure 1 , the current flows along the overcurrent protection module 2 to the electrical appliance 2, namely the air conditioner, thereby providing power to the air conditioner.

[0042] In this embodiment, for electrical appliances that have a significant impact on the safety of the car or the user's driving experience, the overcurrent protection module connected to it can be connected in parallel with an emergency current limiting power supply module. Figure 1 Since when electrical appliance 2, i.e., the air conditioner, fails to work, although it will not have a direct and significant impact on the safety of the car, it will seriously affect the user's comfort. Therefore, it can be considered that electrical appliance 2, i.e., the air conditioner, is an electrical appliance with a greater impact and a higher degree of importance. The emergency current limiting power supply module 2 can be connected in parallel to the overcurrent protection module 2 connected to electrical appliance 2; and when electrical appliance 1, i.e., the audio-visual entertainment system, fails to work, it will neither have a direct and significant impact on the safety of the car nor seriously affect the user's comfort. Therefore, it can be considered that electrical appliance 1, i.e., the audio-visual entertainment system, is an electrical appliance of low importance. The emergency current limiting power supply module can be connected in parallel to the overcurrent protection module 1 connected to electrical appliance 1, or it can be connected in parallel to the emergency current limiting power supply module.

[0043] In this embodiment, each overcurrent protection module is a fuse. When an overcurrent fault such as overload or short circuit occurs in an electrical appliance connected to an overcurrent protection module, the fuse will melt, thereby cutting off the power supply to the electrical appliance.

[0044] In this embodiment, Figure 1 The structure of each emergency current limiting power supply module is as follows Figure 2 or Figure 3 shown.

[0045] Reference Figure 2Only one current-limiting resistor can be set in each emergency current-limiting power supply module, so that the emergency current-limiting power supply module can provide a current path and limit the current size.

[0046] Reference Figure 3 A current-limiting resistor and an eFuse (Electronic Fuse) can be set in each emergency current-limiting power supply module. The current-limiting resistor can provide a current path and limit the current size. The eFuse can be turned on and off in a controllable manner, thereby controlling the current path of the emergency current-limiting power supply module to be turned on or off.

[0047] In this embodiment, Figure 1 The working principle of the low-voltage power supply system for automobiles shown is: if the overcurrent protection module connected to an electrical appliance is connected in parallel with the emergency current limiting power supply module, then when the overcurrent protection module is disconnected, the emergency current limiting power supply module will also connect the electrical appliance to the power module, so that the electrical appliance will not immediately lose the power supply of the power module, so that the electrical appliance can still perform its function, and can avoid the instantaneous complete loss of functions of highly important electrical appliances such as brakes and lighting systems, thereby providing time for the driver to deal with the fault and ensure the safety of car driving; moreover, since the electrical appliance can be prevented from immediately losing the power supply of the power module, the sudden load change of the power module can also be avoided, which is conducive to ensuring the stable operation of the power module and thus ensuring the safety of vehicle-mounted equipment.

[0048] In this embodiment, under normal working conditions, that is, when the overcurrent protection module is not blown, refer to Figure 1 The path between some electrical appliances and the power module is obtained by connecting the overcurrent protection module in parallel with the emergency current limiting power supply module. In this way, the resistance of the path between the electrical appliances and the power module is smaller than the resistance of the overcurrent protection module. Therefore, a fuse with slightly larger resistance can be selected as the overcurrent protection module for compensation.

[0049] Figure 4 It is another form of low voltage power supply system used in automobiles. Figure 4 ,The low-voltage power supply system for automobiles includes multiple overcurrent protection modules and an emergency current limiting power supply module.

[0050] Reference Figure 4The emergency current-limiting power supply module includes a current-limiting unit, a gating unit, and a control unit. Specifically, the gating unit integrates multiple switching components, such as relays or IGBTs (Insulated-Gate Bipolar Transistors). The control unit can generate a gating signal. After the gating signal is input into the gating unit, it is decoded by a decoding component in the gating unit, so that some or all of the output terminals are connected to the input terminals, or some or all of the output terminals are disconnected from the input terminals.

[0051] The current limiting unit may be a resistor.

[0052] For example, refer to Figure 4 The output end of the gating unit connected to electrical appliance 1, namely the audio-visual entertainment system, is disconnected from the input end of the gating unit. In this way, the current limiting unit in the emergency current limiting power supply module is not connected in parallel with the overcurrent protection module 1 connected to electrical appliance 1, namely the audio-visual entertainment system; the output end of the gating unit connected to electrical appliance 2, namely the air conditioner, is connected to the input end of the gating unit. In this way, the current limiting unit in the emergency current limiting power supply module is connected in parallel with the overcurrent protection module 2 connected to electrical appliance 2, namely the air conditioner.

[0053] Figure 4 In the example, if an electrical appliance is connected to the current limiting unit by the gating unit, it is equivalent to the current limiting unit being connected in parallel to the overcurrent protection module connected to the electrical appliance, thus forming a Figure 1 Circuits with the same structure, i.e. Figure 4 The current limiting unit in Figure 1 Emergency current limiting power supply module in. Figure 1 From the principle of the embodiment, it can be seen that the electrical appliance connected in parallel with the current limiting unit can, in the event of a fault, when the corresponding overcurrent protection module is disconnected, the current limiting unit will still connect the electrical appliance to the power module, so that the electrical appliance will not immediately lose the power supply of the power module, so that the electrical appliance can still perform its function, and can avoid the instantaneous complete loss of functions of highly important electrical appliances such as brakes and lighting systems, thereby providing time for the driver to deal with the fault and ensure the safety of car driving; moreover, since the electrical appliance can be prevented from immediately losing the power supply of the power module, the sudden load change of the power module can also be avoided, which is conducive to ensuring the stable operation of the power module and thus ensuring the safety of vehicle-mounted equipment.

[0054] because Figure 4 In the example, the control unit can edit the selection signal to control which overcurrent protection modules the current limiting unit is connected in parallel with and which overcurrent protection modules are not connected in parallel with. Figure 1It can be seen from the embodiments that the current limiting unit (emergency current limiting power supply module) can be connected in parallel to the overcurrent protection module of the more important electrical appliances. Therefore, the control unit can only select the more important electrical appliances and connect the current limiting unit in parallel to the overcurrent protection module connected to them, while for those less important electrical appliances, the current limiting unit is not connected in parallel to the overcurrent protection module connected to them, so as to give full play to the overcurrent protection function of the overcurrent protection module itself.

[0055] In this embodiment, when generating the strobe signal, the control module may perform the following steps:

[0056] S1A. Obtain information on the importance of each electrical appliance;

[0057] S2A. According to the importance of each information, determine the first on-off state of each electrical appliance;

[0058] S3A. Generate a strobe signal according to each first on-off state.

[0059] In step S1A, the importance of each electrical appliance can be represented by a numerical value, with larger numerical values ​​indicating higher importance. The importance of each electrical appliance can be obtained by the vehicle manufacturer based on vehicle calibration tests or customized by the vehicle owner. For example, the importance of appliance 1 (the audio and video entertainment system) can be set to 20, the importance of appliance 2 (the air conditioner) to 50, the importance of appliance 3 (the air conditioner) to 60, and the importance of appliance 3 (the braking system) to 100.

[0060] In step S2A, the control unit may set a first threshold value and use the first threshold value to determine the importance level of each electrical appliance. For example, the first threshold value may be set to 50. In this way, electrical appliance 2 (the air conditioner) with an importance level of 60 and electrical appliance 3 (the brake system) with an importance level of 100 are both considered high-importance electrical appliances. The first on-off state corresponding to electrical appliance 2 (the air conditioner) is determined to be "on." Similarly, the first on-off state corresponding to electrical appliance 3 (the brake system) is also determined to be "on." The first on-off state corresponding to electrical appliance 1 (the audio-visual entertainment system) is determined to be "off."

[0061] In step S3A, the control unit generates a gating signal based on the first on / off states set in step S2A. When the control unit sends this gating signal to the gating unit, the gating unit disconnects the input terminal from the output terminal connected to appliance 1, i.e., the audio-visual entertainment system; connects the input terminal to the output terminal connected to appliance 2, i.e., the air conditioner; and connects the input terminal to the output terminal connected to appliance 3, i.e., the braking system.

[0062] By executing steps S1A-S3A, the overcurrent protection modules (including Figure 4 The overcurrent protection module 2 and the overcurrent protection module 3 in the apparatus are connected in parallel with the current limiting unit, thereby achieving the effect of ensuring the functional use of these electrical appliances; at the same time, the overcurrent protection modules (including the overcurrent protection modules) connected to the less important electrical appliances (including the electrical appliance 1, i.e., the audio-visual entertainment system, etc.) are connected to the apparatus. Figure 4 The overcurrent protection module 1 in the vehicle body will not be connected in parallel with the current limiting unit. In this way, when the overcurrent protection module 1 is disconnected, the electrical appliance 1 will directly lose power supply, ensuring the safety of automobile power use, and will not cause serious negative impact on the safety of automobile use or driving experience.

[0063] In this embodiment, when generating the strobe signal, the control module may perform the following steps:

[0064] S1B. Get the remaining life information of each overcurrent protection module;

[0065] S2B. According to the remaining life information, determine the second on-off state of each overcurrent protection module corresponding to each;

[0066] S3B. Generate a strobe signal according to each second on-off state.

[0067] In step S1B, the control unit can establish a service life decay model for each overcurrent protection module. For example, this model records the total lifespan and activation date of each overcurrent protection module and calculates the remaining service life of each overcurrent protection module at the current time using linear decay or decay curves provided by the manufacturer. The remaining service life of an overcurrent protection module indicates the estimated remaining service life of the overcurrent protection module, based on the technical standards set by the manufacturer.

[0068] In step S2B, the control unit may set a second threshold value and use the second threshold value to determine the size of each remaining life information. For example, the second threshold value may be set to 3 months. Figure 3 If the remaining life information of the overcurrent protection module 1 is 2 months, it can be determined that the remaining life information of the overcurrent protection module 1 is short, and the second on-off state corresponding to the overcurrent protection module 1 is determined to be "on"; if Figure 3 If the remaining life information of the overcurrent protection module 2 is 5 months, it can be determined that the remaining life information of the overcurrent protection module 2 is long, and the second on-off state corresponding to the overcurrent protection module 2 is determined to be "off".

[0069] In step S3B, the control unit generates a gating signal based on the second on / off states set in step S2B. When the control unit sends such a gating signal to the gating unit, the gating unit connects the input terminal to the output terminal connected to the overcurrent protection module 1 and disconnects the input terminal from the output terminal connected to the overcurrent protection module 2.

[0070] By executing steps S1B-S3B, the overcurrent protection modules with shorter remaining life information can be connected in parallel with the current limiting units, thereby achieving the effect of ensuring the functional use of these electrical appliances, and at the same time, the overcurrent protection modules with longer remaining life information will not be connected in parallel with the current limiting units; because at the same time, the overcurrent protection modules with shorter remaining life information are more likely to be disconnected, causing the connected electrical appliances to directly lose power supply, based on the principle of steps S1A-S3A, current limiting units are connected in parallel to these overcurrent protection modules, which is beneficial to avoid the electrical appliances from directly losing power supply and ensuring the safety of automobile electricity use; accordingly, the overcurrent protection modules with longer remaining life information are less likely to be disconnected, so current limiting units do not need to be connected in parallel to these overcurrent protection modules, so that these overcurrent protection modules can play an overcurrent protection role.

[0071] In this embodiment, a resistor with a fixed resistance or an adjustable resistance can be used as the current limiting unit. If a resistor with an adjustable resistance is used as the current limiting unit, the resistance of the current limiting unit can be set to be negatively correlated with the number of output terminals connected to the input terminal. For example, the resistance of the current limiting unit is set inversely proportional to the number of output terminals connected to the input terminal. Since more output terminals are connected to the input terminal, generally, a greater current will flow through the current limiting unit, so setting the resistance of the current limiting unit to a smaller value is beneficial to ensuring the overcurrent capacity of the current limiting unit and ensuring safe use.

[0072] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in this disclosure are only relative to the relative positional relationship of the components of the present disclosure in the accompanying drawings. The singular forms of "a" and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. In addition, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as those generally understood by those skilled in the art. The terms used in the specification of this embodiment are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this embodiment includes any combination of one or more related listed items.

[0073] It should be understood that, although the present disclosure may adopt the term first, second, third etc. to describe various elements, these elements should not be limited to these terms.These terms are only used to distinguish the elements of the same type from each other.For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.The use of any and all examples or exemplary language ("for example", "such as" etc.) provided by the present embodiment is only intended to better illustrate embodiments of the present invention, and unless otherwise required, the scope of the present invention will not be limited.

[0074] It should be appreciated that embodiments of the present invention can be implemented or practiced by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The methods can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the methods and figures described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, the program can be run on a programmed application-specific integrated circuit for this purpose.

[0075] In addition, the operations of the processes described in this embodiment may be performed in any suitable order, unless otherwise indicated in this embodiment or otherwise clearly contradicted by the context. The processes described in this embodiment (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that is executed collectively on one or more processors, by hardware, or a combination thereof. A computer program includes multiple instructions that can be executed by one or more processors.

[0076] Furthermore, the method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and / or write storage medium, RAM, ROM, etc., so that it can be read by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the process described herein. In addition, the machine-readable code, or portions thereof, can be transmitted over a wired or wireless network. When such media includes instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor, the invention of this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0077] The computer program can be applied to input data to perform the functions of the present embodiment, thereby converting the input data to generate output data that is stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on the display.

[0078] The above are merely preferred embodiments of the present invention. The present invention is not limited to the aforementioned embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. Within the scope of protection of the present invention, various modifications and variations of the technical solutions and / or implementation methods may be made.

Claims

1. A low-voltage power supply system for a car, characterized in that: The low-voltage power supply system for a vehicle comprises: At least one overcurrent protection module; one end of each of the overcurrent protection modules is connected as a first end, and the other end of each of the overcurrent protection modules is respectively used to be connected to an on-board electrical appliance; At least one emergency current limiting power supply module; for any of the emergency current limiting power supply modules, one end of the emergency current limiting power supply module is connected to one end of the corresponding at least one overcurrent protection module, and the other end of the emergency current limiting power supply module is connected to the other end of the corresponding at least one overcurrent protection module; The emergency current limiting power supply module includes: a current limiting unit; one end of the current limiting unit is connected to the first end; A gating unit; the gating unit includes an input end, multiple output ends and a control end, the input end of the gating unit is connected to the other end of the current limiting unit, any output end of the gating unit is connected to the other end of a corresponding overcurrent protection module, the control end of the gating unit is used to receive a gating signal, and the gating unit is used to connect or disconnect the input end and each of the output ends according to the gating signal; A control unit; the control unit is used to obtain importance information of each of the electrical appliances, set a first threshold value, and for any of the electrical appliances, when the importance information corresponding to the electrical appliance is greater than the first threshold value, the first on-off state corresponding to the electrical appliance is determined to be on, otherwise, the first on-off state corresponding to the electrical appliance is determined to be off; the first on-off state represents the state of connection or disconnection between the input end of the selection unit and the output end corresponding to the electrical appliance, and the selection signal is generated according to each of the first on-off states, and the selection signal is sent to the control end of the selection unit.

2. The low-voltage power supply system for a vehicle according to claim 1, characterized in that: The overcurrent protection module is a fuse.

3. The low-voltage power supply system for a vehicle according to claim 1, characterized in that: The emergency current-limiting power supply module includes a current-limiting resistor; one end of the current-limiting resistor serves as one end of the emergency current-limiting power supply module, and the other end of the current-limiting resistor serves as the other end of the emergency current-limiting power supply module.

4. The low-voltage power supply system for a vehicle according to claim 1, characterized in that: The emergency current limiting power supply module includes a current limiting resistor and an eFuse; one end of the current limiting resistor serves as one end of the emergency current limiting power supply module, the other end of the current limiting resistor is connected to one end of the eFuse, and the other end of the eFuse serves as the other end of the emergency current limiting power supply module.

5. The low-voltage power supply system for a vehicle according to claim 1, characterized in that: Generating a strobe signal, comprising: Obtaining the remaining life information of each of the overcurrent protection modules; Determining, based on each of the remaining life information, a second on-off state corresponding to each of the overcurrent protection modules; the second on-off state represents a state of connection or disconnection between the input end of the gating unit and the output end corresponding to the overcurrent protection module; The strobe signal is generated according to each of the second on-off states.

6. The low-voltage power supply system for a vehicle according to claim 5, characterized in that: The determining, based on the remaining life information, the second on / off state corresponding to each of the overcurrent protection modules, includes: setting a second threshold; For any of the overcurrent protection modules, when the remaining life information corresponding to the overcurrent protection module is less than the second threshold, the second on-off state corresponding to the overcurrent protection module is determined to be on; otherwise, the second on-off state corresponding to the overcurrent protection module is determined to be off.

7. The low-voltage power supply system for a vehicle according to any one of claims 1 to 6, characterized in that: The low-voltage power supply system for a vehicle further comprises: A power supply module; an output end of the power supply module is connected to the first end.

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