Vehicle power-on protection circuit and vehicle

Abstract

The utility model provides a vehicle power-on protection circuit and a vehicle. One end of the charging current limiting module is used for being connected with a low-voltage load and a battery of the whole vehicle, the other end of the charging current limiting module is used for being connected with an external power supply device, and the charging current limiting module is used for conducting one-way current limiting on a power supply circuit when the external power supply device supplies power to the low-voltage load and the battery of the whole vehicle. One end of the first over-current protection module is connected with one end of the charging current limiting module, the other end of the first over-current protection module is connected with the other end of the charging current limiting module, and the first over-current protection module is used for carrying out over-current protection on a low-voltage load of the whole vehicle. Through the circuit, the low-voltage load of the whole vehicle can be effectively protected, and the technical problem that low-voltage load electronic elements are burnt out under the condition of overlarge current or short circuit is solved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle power supply technology, and in particular relates to a vehicle jump-start protection circuit and a vehicle. Background Art

[0002] In recent years, the development of vehicles has been rapid, with continuous technological innovation and advancement. More and more people are using vehicles. Currently, the intelligence of vehicles is rapidly developing, and intelligent systems are consuming increasing amounts of power from low-voltage circuits. At the same time, improper operation can easily occur when using a vehicle. For example, forgetting to turn off the lights, air conditioning, hazard lights, or onboard electronic devices before leaving can easily lead to insufficient charge in the vehicle's low-voltage battery.

[0003] When the vehicle's low-voltage power is depleted and cannot be replenished, the vehicle's low-voltage loads will not function properly. At this point, an external power source must be used to supply power to the vehicle's low-voltage battery. However, when the external power source supplies power to the vehicle's low-voltage loads and the vehicle's low-voltage battery, a large current is generated instantaneously, which can easily damage the vehicle's low-voltage loads. Utility Model Content

[0004] The purpose of this application is to provide a vehicle jump-start protection circuit and a vehicle, aiming to solve the problem that low-voltage loads are easily damaged when traditional vehicles use an external power supply to power the low-voltage loads and the low-voltage batteries of the entire vehicle.

[0005] A first aspect of an embodiment of the present application provides a vehicle jump-start protection circuit, comprising:

[0006] A charging current limiting module, one end of which is used to connect to the low-voltage load and battery of the vehicle, and the other end of which is used to connect to an external power supply device. The charging current limiting module is used to perform unidirectional current limiting on the power supply circuit when the external power supply device supplies power to the low-voltage load and battery of the vehicle;

[0007] A first overcurrent protection module, one end of the first overcurrent protection module is connected to one end of the charging current limiting module, and the other end of the first overcurrent protection module is connected to the other end of the charging current limiting module. The first overcurrent protection module is used to perform overcurrent protection on the low-voltage load of the entire vehicle.

[0008] In one embodiment, the vehicle jump protection circuit further includes:

[0009] a discharge current limiting module, one end of which is connected to one end of the charge current limiting module, and the other end of which is connected to one end of the first overcurrent protection module;

[0010] The discharge current limiting module is used to unidirectionally limit the current in the discharge circuit when the vehicle is being software flashed during the production stage, so as to activate the external power supply device required for software flashing.

[0011] In one embodiment, the vehicle jump-start protection circuit further includes:

[0012] A second overcurrent protection module, one end of the second overcurrent protection module is used to be connected to the vehicle's low-voltage load and the battery, the other end of the second overcurrent protection module is connected to one end of the charging current limiting module and one end of the first overcurrent protection module, and the second overcurrent protection module is used to perform overcurrent protection on the vehicle's low-voltage load.

[0013] In one embodiment, the charging current limiting module includes:

[0014] A first diode, the anode terminal of the first diode is used to be connected to the external power supply device, and the cathode terminal of the first diode is used to be connected to the vehicle's low-voltage load and the battery.

[0015] In one embodiment, the discharge current limiting module includes:

[0016] A second diode, the anode terminal of the second diode is used to be connected to the vehicle's low-voltage load and the battery, and the cathode terminal of the second diode is used to be connected to one end of the first overcurrent protection module;

[0017] The first overcurrent protection module includes:

[0018] A first resettable fuse, one end of the first resettable fuse is connected to the cathode terminal of the first diode, and the other end of the first resettable fuse is connected to the other end of the charging current limiting module.

[0019] The present application provides a vehicle jump-start protection circuit, including:

[0020] A third overcurrent protection module, one end of the third overcurrent protection module is used to be connected to the vehicle's low-voltage load and the battery, and the third overcurrent protection module is used to perform overcurrent protection on the vehicle's low-voltage load;

[0021] A charging current limiting module, one end of the charging current limiting module is connected to the other end of the third overcurrent protection module, the other end of the charging current limiting module is used to be connected to an external power supply device, and the charging current limiting module is used to unidirectionally limit the current in the power supply circuit when the external power supply device supplies power to the vehicle's low-voltage load and the battery;

[0022] A short - circuit protection module, one end of the short - circuit protection module is connected to one end of the charging current - limiting module and the other end of the third over - current protection module, and the other end of the short - circuit protection module is connected to the other end of the charging current - limiting module; the short - circuit protection module is used to perform short - circuit protection on the vehicle low - voltage load.

[0023] In one embodiment, the vehicle jump - start protection circuit further includes:

[0024] A shock - absorption module, one end of the shock - absorption module is connected to one end of the short - circuit protection module, and the other end of the shock - absorption module is connected to the other end of the short - circuit protection module. The shock - absorption module is used to consume and release the induced electromotive force generated by the short - circuit protection module when the external power supply device ends power supply, so as to protect the vehicle low - voltage load.

[0025] In one embodiment, the vehicle jump - start protection circuit further includes:

[0026] A voltage - stabilizing module, one end of the voltage - stabilizing module is connected to one end of the short - circuit protection module, and the other end of the voltage - stabilizing module is connected to the other end of the short - circuit protection module. The voltage - stabilizing module is used to stabilize the voltage across the short - circuit protection module.

[0027] In one embodiment, the short - circuit protection module includes:

[0028] A current - stabilizing resistor, one end of the current - stabilizing resistor is connected to one end of the charging current - limiting module;

[0029] An inductor, one end of the inductor is connected to the other end of the current - stabilizing resistor, and the other end of the inductor is connected to the other end of the charging current - limiting module.

[0030] This application provides a vehicle, including the vehicle jump - start protection circuit described in any one of the above - mentioned embodiments.

[0031] The beneficial effects of the embodiments of the present utility model compared with the prior art are:

[0032] When performing software flashing on a vehicle during the production stage, an external power supply device is required to maintain the voltage needed during the software flashing process. The positive terminal of the required external power supply device is connected to the external jump-start terminal a, and the negative terminal of the required external power supply device is connected to the vehicle body through the vehicle body short-circuit grounding terminal b. The first overcurrent protection module in the vehicle jump-start protection circuit provided by this application discharges the battery to supply power to the external power supply device required during software flashing, so as to detect the voltage provided by the battery and ensure whether it is the vehicle low-voltage voltage provided by the battery. When the external power supply device required during software flashing confirms that the voltage at this time is the vehicle low-voltage voltage provided by the battery, the software flashing process for the vehicle is started during the production stage. The required external power supply device supplies low voltage to the vehicle low-voltage load and the battery through the charging current-limiting module, so that the vehicle low-voltage power supply can be ensured to be continuous during the software flashing of the vehicle in the production stage.

[0033] Through the vehicle jump-start protection circuit provided by this application, a protection circuit formed by the charging current-limiting module and the first overcurrent protection module is established between the external power supply device and the vehicle low-voltage load and the battery, which can solve the problem of instantaneous large current impacting the vehicle low-voltage load caused by the voltage difference between the external power supply device and the power-deficient electrical system in the vehicle, protect the vehicle low-voltage load and the battery, and will not damage the electronic devices in the vehicle, and can ensure the continuous and effective operation of the vehicle low-voltage load and the battery.

[0034] When the battery power consumption is large, such as when the vehicle is parked for a long time and the vehicle low-voltage loads such as the hazard lights, headlights, or air conditioner consume a lot of power, it is necessary to supply power to the vehicle low-voltage load and the battery through an external power supply device. The positive terminal of the external power supply device required for external rescue is connected to the external jump-start terminal a. The external current provided by the external power supply device required for external rescue will supply power to the vehicle low-voltage load and the battery through the charging current-limiting module, which can effectively limit the current impact of the external power supply device required for external rescue on the vehicle low-voltage electrical system, effectively reduce the power impact during jump-starting, ensure the safety of the vehicle low-voltage electrical system, and further enable the vehicle low-voltage load and the battery to operate continuously and effectively.

[0035] When the vehicle collides, the external jump-start terminal a and the vehicle body short-circuit grounding terminal b will come into contact, and the vehicle low-voltage load and the battery will be short-circuited to the vehicle body through the first overcurrent protection module, generating a large amount of current, causing the voltage of the vehicle low-voltage load and the battery to drop. At this time, the first overcurrent protection module is activated to disconnect the circuit where it is located, providing overcurrent protection for the charging current-limiting module and the vehicle low-voltage load and the battery, so that the low-voltage loads such as the vehicle door locks unlocking, the in-vehicle emergency service phone, and the vehicle hazard lights can continue to operate continuously and effectively. Description of the Drawings

[0036] Figure 1Schematic diagram of the vehicle jump-start protection circuit provided by this application;

[0037] Figure 2 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0038] Figure 3 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0039] Figure 4 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0040] Figure 5 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0041] Figure 6 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0042] Figure 7 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0043] Figure 8 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application;

[0044] Figure 9 Schematic diagram of the circuit structure of the vehicle jump-start protection circuit in an embodiment provided by this application. Detailed implementation manners

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0047] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0049] Please refer to Figure 1 , the present application provides a vehicle jump-start protection circuit. The vehicle jump-start protection circuit includes a charging current limiting module 110 and a first overcurrent protection module 120. One end of the charging current limiting module 110 is used to connect to the vehicle low-voltage load 210 and the battery 220. The other end of the charging current limiting module 110 is used to connect to an external power supply device. The external power supply device can be an external power supply device required for software flashing of the vehicle during the production stage or an external power supply device required for external rescue. The charging current limiting module 110 is used to unidirectionally limit the current in the power supply circuit when the external power supply device supplies power to the vehicle low-voltage load 210 and the battery 220. The external power supply device accesses the vehicle jump-start protection circuit through the external jump-start terminal a and supplies power to the vehicle low-voltage load 210 and the battery 220 through the charging current limiting module 110. Through the charging current limiting module 110, the current in the power supply circuit is unidirectionally limited, allowing current to pass through in a single direction, which can protect the vehicle low-voltage load 210 and the battery 220 and prevent damage to the vehicle low-voltage load 210 and the battery 220 caused by excessive current, thus playing an effective protective role. Further, when the external power supply device accesses the vehicle jump-start protection circuit through the external jump-start terminal a, the charging current limiting module 110 can maintain the circuit operating within a safe current range, improving the stability and reliability of the power supply process. In one embodiment, the charging current limiting module 110 includes one or more elements such as a diode and a resistor, which can be set according to the actual application scenario.

[0050] One end of the first overcurrent protection module 120 is connected to one end of the charging current limiting module 110. The other end of the first overcurrent protection module 120 is connected to the other end of the charging current limiting module 110. The first overcurrent protection module 120 is connected in parallel across the two ends of the charging current limiting module 110 to protect the components of the charging current limiting module 110, which can prevent the charging current limiting module 110 from being damaged during operation, thereby ensuring that the vehicle low-voltage load 210 and the battery 220 can be powered smoothly and avoiding abnormal emergencies that may cause the charging current limiting module 110 to malfunction. The first overcurrent protection module 120 is used to provide overcurrent protection for the charging current limiting module 110, the vehicle low-voltage load 210, and the battery 220 during the process of powering the vehicle low-voltage load 210 and the battery 220 by an external power supply device or discharging the battery 220 during software flashing. When an overcurrent situation occurs in the vehicle jump-start protection circuit, it can quickly act to cut off the current to prevent damage to the charging current limiting module 110, the vehicle low-voltage load 210, and the battery 220 due to excessive current. In one embodiment, the first overcurrent protection module 120 includes one or more components such as a resettable fuse and a resistor, which can be set according to the actual application scenario.

[0051] When software flashing is performed on the vehicle during the production stage, an external power supply device is required to maintain the voltage required during the software flashing process. The positive pole of the required external power supply device is connected to the external jump-start wiring terminal a, and the negative pole of the required external power supply device is connected to the vehicle body through the vehicle body short-circuit grounding terminal b. The first overcurrent protection module 120 in the vehicle jump-start protection circuit provided by the present application discharges the battery 220 to supply power to the external power supply device required during software flashing, so as to detect the voltage provided by the battery 220 and ensure whether it is the vehicle low-voltage voltage provided by the battery 220. When the external power supply device required during software flashing confirms that the voltage at this time is the vehicle low-voltage voltage provided by the battery 220, the software flashing process of the vehicle during the production stage is started. The required external power supply device supplies low-voltage power to the vehicle low-voltage load 210 and the battery 220 through the charging current limiting module 110, so that the vehicle low-voltage power supply can be ensured to be continuous when software flashing is performed on the vehicle during the production stage.

[0052] Through the vehicle jump-start protection circuit provided by the present application, a protection circuit formed by the charging current limiting module 110 and the first overcurrent protection module 120 is established between the external power supply device and the vehicle low-voltage load 210 and the battery 220, which can solve the problem of the instantaneous large current impact on the vehicle low-voltage load 210 caused by the voltage difference between the external power supply device and the dead electrical system in the vehicle, protect the vehicle low-voltage load 210 and the battery 220, and will not damage the in-vehicle electronic devices, and can ensure the continuous and effective operation of the vehicle low-voltage load 210 and the battery 220.

[0053] When the power consumption of the battery 220 is high, for example, when the vehicle has been parked for a long time and the low-voltage loads of the whole vehicle 210 such as the hazard lights, headlights, or air conditioner consume a large amount of power, it is necessary to supply power to the low-voltage loads 210 of the whole vehicle and the battery 220 through an external power supply device. The positive pole of the external power supply device required for external rescue is connected to the external jump-start terminal a. The external current provided by the external power supply device required for external rescue will supply power to the low-voltage loads 210 of the whole vehicle and the battery 220 through the charging current-limiting module 110, which can effectively limit the current impact of the external power supply device required for external rescue on the in-vehicle low-voltage electrical system, effectively reduce the power impact during jump-starting, ensure the safety of the vehicle's low-voltage electrical system, and thus enable the low-voltage loads 210 of the whole vehicle and the battery 220 to work continuously and effectively.

[0054] When the vehicle collides, the external jump-start terminal a will come into contact with the body short-circuit grounding terminal b, and the low-voltage loads 210 of the whole vehicle and the battery 220 will have a short-circuit condition with the body through the first overcurrent protection module 120, generating a large amount of current, causing the voltage of the low-voltage loads 210 of the whole vehicle and the battery 220 to drop. At this time, the first overcurrent protection module 120 is activated to disconnect the circuit where it is located, providing overcurrent protection for the charging current-limiting module 110 and the low-voltage loads 210 of the whole vehicle and the battery 220, and thus enabling the low-voltage loads such as the vehicle door locks to unlock, the in-vehicle emergency service phone, and the hazard lights of the whole vehicle to continue to work continuously and effectively.

[0055] In one embodiment, the charging current-limiting module 110 includes a first diode 111. The anode terminal of the first diode 111 is used to connect to the external power supply device, and the cathode terminal of the first diode 111 is used to connect to the low-voltage loads 210 of the whole vehicle and the battery 220. The current output by the external power supply device flows through the first diode 111 and into the low-voltage loads 210 of the whole vehicle and the battery 220 to supply power to the low-voltage loads 210 of the whole vehicle and the battery 220. A unidirectional charging current-limiting circuit is formed through the first diode 111, which can prevent excessive current from damaging the low-voltage loads 210 of the whole vehicle and the battery 220, playing an effective protective role. At the same time, through the first diode 111, it is helpful to maintain the circuit working within a safe current range, ensuring the stable and reliable operation of the system.

[0056] In one embodiment, the first overcurrent protection module 120 includes a first resettable fuse 121. One end of the first resettable fuse 121 is connected to the cathode of the first diode 111, the vehicle low-voltage load 210, and the battery 220. The other end of the first resettable fuse 121 is connected to the anode of the first diode 111 and the external power connection terminal a. When an overcurrent occurs in the circuit, the first resettable fuse 121 can act quickly to cut off the current and prevent damage to the first diode 111 and the vehicle low-voltage load 210 due to excessive current. After the overcurrent fault is eliminated, it can automatically return to the normal working state without manual replacement of the fuse, reducing the maintenance cost and time. It can experience the overcurrent protection and recovery process multiple times, improving the reliability of the vehicle power connection protection circuit and ensuring the continuous and stable operation of the circuit.

[0057] Please refer to Figure 2 , in one embodiment, the vehicle power connection protection circuit further includes a discharge current limiting module 130. One end of the discharge current limiting module 130 is connected to one end of the charge current limiting module 110, and the other end of the discharge current limiting module 130 is connected to one end of the first overcurrent protection module 120. In one embodiment, the discharge current limiting module 130 includes one or more components such as a diode and a resistor, which can be set according to the actual application scenario. The discharge current limiting module 130 is connected in series with the first overcurrent protection module 120 to form a current in the direction from the battery 220 to the external power connection terminal a, discharge the battery 220, and supply power to the external power supply device required during software flashing to detect the voltage provided by the battery 220 and ensure whether it is the vehicle low-voltage voltage provided by the battery 220. The discharge current limiting module 130 is used to unidirectionally limit the current in the discharge circuit during the software flashing of the vehicle in the production stage to start the external power supply device required for software flashing. When the external power supply device required for software flashing confirms that the voltage at this time is the vehicle low-voltage voltage provided by the battery 220, the software flashing process of the vehicle in the production stage is started. The required external power supply device supplies low-voltage power to the vehicle low-voltage load 210 and the battery 220 through the charge current limiting module 110, so that the vehicle low-voltage power supply can be ensured to be continuous during the software flashing of the vehicle in the production stage.

[0058] Through the discharge current limiting module 130, unidirectional current limiting is performed on the discharge circuit where it is located, allowing current to pass through in a single direction, which can protect the vehicle low-voltage load 210 and the battery 220, preventing excessive current from damaging the vehicle low-voltage load 210 and the battery 220, and playing an effective protective role. Thus, when performing software flashing on the vehicle during the production stage, through the discharge current limiting module 130 and the charging current limiting module 110, it is possible to maintain the circuit working within a safe current range during the discharge process and the charging process, improving the stability and reliability of the discharge process and the power supply process, and being able to better protect the vehicle low-voltage load 210 and the battery 220.

[0059] When the vehicle collides, the external power supply connection terminal a and the vehicle body short-circuit grounding terminal b will come into contact. The vehicle low-voltage load 210 and the battery 220 will have a short-circuit condition with the vehicle body through the discharge current limiting module 130 and the first overcurrent protection module 120, generating a large amount of current, causing the voltage of the vehicle low-voltage load 210 and the battery 220 to drop. At this time, the first overcurrent protection module 120 is activated to disconnect the circuit where it is located, providing overcurrent protection for the discharge current limiting module 130, the charging current limiting module 110, and the vehicle low-voltage load 210.

[0060] In one embodiment, the discharge current limiting module 130 includes a second diode 131. The anode terminal of the second diode 131 is used to connect to the vehicle low-voltage load 210 and the battery 220. The anode terminal of the second diode 131 is also connected to the cathode terminal of the first diode 111. The cathode terminal of the second diode 131 is used to connect to one end of the first overcurrent protection module 120. The anode terminal of the first diode 111 is connected to the other end of the first overcurrent protection module 120. The current output by the battery 220 passes through the second diode 131 and the first overcurrent protection module 120, flows into the external power supply connection terminal, and then reaches the external power supply device required for software flashing. When the external power supply device required for software flashing confirms that the voltage at this time is the vehicle low-voltage voltage provided by the battery 220, the software flashing process for the vehicle during the production stage is started.

[0061] The required external power supply device supplies low-voltage power to the vehicle low-voltage load 210 and the battery 220 through the first diode 111, so that it can be ensured that the vehicle low-voltage does not lose power when performing software flashing on the vehicle during the production stage. A unidirectional discharge current limiting circuit is formed through the second diode 131, which can prevent excessive current from damaging the first diode 111, the vehicle low-voltage load 210, and the battery 220, and play an effective protective role. Through the second diode 131, it is helpful to maintain the circuit working within a safe current range and ensure the stable and reliable operation of the system.

[0062] In one embodiment, the first overcurrent protection module 120 includes a first resettable fuse 121. One end of the first resettable fuse 121 is connected to the cathode end of the second diode 131. The other end of the first resettable fuse 121 is connected to the other end of the charging current limiting module 110. Alternatively, the other end of the first resettable fuse 121 can be connected to the anode end of the first diode 111 and the external power connection terminal a. The first resettable fuse 121 and the second diode 131 are connected in series to form a discharge current limiting circuit for discharging from the battery 220. By connecting the first resettable fuse 121 and the second diode 131 in series, the reliability of the vehicle power connection protection circuit can be ensured bidirectionally, preventing sudden overcurrent from damaging the circuit and the load.

[0063] Please refer to Figure 3 , in one embodiment, the charging current limiting module 110 further includes a first resistor 112. One end of the first resistor 112 is connected to the vehicle low-voltage load 210 and the battery 220. The first resistor 112 is also connected to the anode end of the second diode 131. The other end of the first resistor 112 is connected to the cathode end of the first diode 111. The anode end of the first diode 111 is connected to an external power supply device. The anode end of the first diode 111 is also connected to the other end of the first resettable fuse 121. The first resistor 112 and the first diode 111 are connected in series to form a charging current limiting circuit from the external power connection terminal a to the vehicle low-voltage load 210 and the battery 220, and is connected in parallel with the discharge current limiting circuit. Through the charging current limiting circuit and the discharge current limiting circuit in the vehicle power connection protection circuit, current limiting control is performed separately from two different directions of charging and discharging, so that when the vehicle power connection protection circuit is applied to different scenarios, overcurrent protection can be provided to the vehicle low-voltage load 210 from multiple different directions, preventing damage to the vehicle low-voltage load 210 due to excessive current.

[0064] Please refer to Figure 4, in one embodiment, the vehicle jump - start protection circuit further includes a second over - current protection module 140. One end of the second over - current protection module 140 is used to connect to the vehicle's low - voltage load 210 and the battery 220. The other end of the second over - current protection module 140 is connected to one end of the charging current - limiting module 110 and one end of the first over - current protection module 120. The second over - current protection module 140 is used to protect the charging current - limiting module 110, the first over - current protection module 120, and the vehicle's low - voltage load 210. In one embodiment, the second over - current protection module 140 includes one or more elements such as a resettable fuse and a resistor, which can be set according to the actual application scenario. The second over - current protection module 140 is arranged on the main connection structure where the charging current - limiting module 110, the first over - current protection module 120 are connected to the vehicle's low - voltage load 210 and the battery 220. When the vehicle collides or when an external power supply device supplies power to the vehicle's low - voltage load 210 and the battery 220, over - current protection is provided for the vehicle's low - voltage load 210.

[0065] The second over - current protection module 140 is arranged on the main trunk of the vehicle jump - start protection circuit. The current that the second over - current protection module 140 can allow to pass through is greater than the current that the first over - current protection module 120 can allow to pass through. Through the first over - current protection module 120 and the second over - current protection module 140, multiple over - current protections are formed, and over - current protection is provided for the vehicle's low - voltage load 210 from different areas of the circuit. When one of the over - current protection modules fails or fails to act in time, the other over - current protection module can play the role of over - current protection, reducing the probability that the circuit faces risks due to the failure of the over - current protection module and improving the reliability of the vehicle jump - start protection circuit.

[0066] In one embodiment, the second over - current protection module 140 includes a second resettable fuse 141. The first over - current protection module 120 includes a first resettable fuse 121 and a second resistor 122. One end of the second resettable fuse 141 is connected to the vehicle's low - voltage load 210 and the battery 220. The other end of the second resettable fuse 141 is connected to the cathode end of the first diode 111 and one end of the second resistor 122. The other end of the second resistor 122 is connected to one end of the first resettable fuse 121. The other end of the first resettable fuse 121 is connected to the anode end of the first diode 111. By arranging the second resettable fuse 141 and the first resettable fuse 121 on the main trunk and branch of the vehicle jump - start protection circuit respectively, sudden over - current can be prevented from damaging the circuit and the load from different perspectives, further improving the reliability of the vehicle jump - start protection circuit and achieving multiple guarantees.

[0067] Please refer to Figure 5, this application provides a vehicle jump - starting protection circuit including a third over - current protection module 150, a charging current - limiting module 110, and a short - circuit protection module 160. One end of the third over - current protection module 150 is used to connect to the vehicle's low - voltage load 210 and the battery 220. One end of the charging current - limiting module 110 is connected to the other end of the third over - current protection module 150. The third over - current protection module 150 is disposed on the main trunk of the vehicle jump - starting protection circuit and is used to perform over - current protection on the charging current - limiting module 110, the short - circuit protection module 160, the vehicle's low - voltage load 210, and the battery 220 when an external power supply device supplies power to the vehicle's low - voltage load 210 and the battery 220, or when discharging the battery 220 during software flashing, or during a vehicle collision. In one embodiment, the third over - current protection module 150 includes one or more elements such as a resettable fuse and a resistor, which can be set according to the actual application scenario. When a vehicle collision occurs or when an external power supply device supplies power to the vehicle's low - voltage load 210 and the battery 220, over - current protection is performed on the vehicle's low - voltage load 210 through the third over - current protection module 150. Moreover, the third over - current protection module 150 can protect the elements in the charging current - limiting module 110 and the short - circuit protection module 160, which can prevent the charging current - limiting module 110 from being damaged during operation, and thus ensure that power can be smoothly supplied to the vehicle's low - voltage load 210 and the battery 220, avoiding abnormal emergencies that cause the charging current - limiting module 110 to malfunction. When an over - current situation occurs in the vehicle jump - starting protection circuit, the third over - current protection module 150 can quickly act to cut off the current, preventing damage to the charging current - limiting module 110, the short - circuit protection module 160, the vehicle's low - voltage load 210, and the battery 220 due to excessive current.

[0068] The other end of the charging current - limiting module 110 is connected to an external power supply device through an external jump - starting terminal a. The charging current - limiting module 110 is used to perform unidirectional current limiting on the power supply circuit when an external power supply device supplies power to the vehicle's low - voltage load 210 and the battery 220. The charging current - limiting module 110 in this embodiment is the same as the charging current - limiting module 110 in the above - mentioned embodiment, and the relevant description can refer to the description in the above - mentioned embodiment. One end of the short - circuit protection module 160 is connected to one end of the charging current - limiting module 110 and the other end of the third over - current protection module 150, and the other end of the short - circuit protection module 160 is connected to the other end of the charging current - limiting module 110. The short - circuit protection module 160 is connected in parallel with the charging current - limiting module 110 to form two branches. In one embodiment, the short - circuit protection module 160 includes one or more of a resistor and an inductor, which can be set according to the actual application scenario.

[0069] The short - circuit protection module 160 is used to provide an initial detection voltage during the discharge of the battery 220 during software flashing, and to provide short - circuit protection for the charging current - limiting module 110, the vehicle's low - voltage load 210, and the battery 220 when the vehicle collides.

[0070] When the power consumption of the battery 220 is large, for example, when the vehicle has been parked for a long time and the low - voltage load 210 of the vehicle, such as the hazard lights, headlights, or air conditioner, consumes a large amount of power, it is necessary to supply power to the vehicle's low - voltage load 210 and the battery 220 through an external power supply device. The positive pole of the external power supply device required for external rescue is connected to the external jump - starting terminal a. The external current provided by the external power supply device required for external rescue will supply power to the vehicle's low - voltage load 210 and the battery 220 through the charging current - limiting module 110 and the short - circuit protection module 160, which can effectively limit the current impact of the external power supply device required for external rescue on the in - vehicle low - voltage electrical system, effectively reduce the power impact during jump - starting, ensure the safety of the vehicle's low - voltage electrical system, and thus enable the vehicle's low - voltage load 210 and the battery 220 to work continuously and effectively.

[0071] The short - circuit protection module 160 is also used to discharge the circuit where it is located when the vehicle is undergoing software flashing during the production stage, so as to provide an initial detection voltage to the external power supply device required for software flashing, and then start the external power supply device required for software flashing based on the initial detection voltage. When the vehicle is undergoing software flashing during the production stage, the battery 220 is discharged through the short - circuit protection module 160 to supply power to the external power supply device required for software flashing, so as to detect the voltage provided by the battery 220 to ensure whether it is the vehicle's low - voltage voltage provided by the battery 220. When the external power supply device required for software flashing confirms that the voltage at this time is the vehicle's low - voltage voltage provided by the battery 220, the process of software flashing the vehicle during the production stage is started. The required external power supply device supplies low - voltage power to the vehicle's low - voltage load 210 and the battery 220 through the charging current - limiting module 110 and the short - circuit protection module 160, so as to ensure that the vehicle's low - voltage power supply is not interrupted when the vehicle is undergoing software flashing during the production stage.

[0072] When a vehicle collision occurs, the external jump-start terminal a will come into contact with the vehicle body short-circuit grounding terminal b. The vehicle's low-voltage load 210 and the battery 220 will experience a short-circuit condition with the vehicle body through the third overcurrent protection module 150 and the short-circuit protection module 160, generating a large amount of current, which causes the voltages of the vehicle's low-voltage load 210 and the battery 220 to drop. At this time, when a vehicle collision occurs, the short-circuit protection module 160 can cause the third overcurrent protection module 150 to disconnect after the current stabilizes, thereby ensuring that the vehicle's low-voltage load 210 can continue to be powered. Or, when a vehicle collision occurs, the current of the short-circuit protection module 160 will exceed the allowable current of the internal inductor, causing the internal inductor of the short-circuit protection module 160 to disconnect, thereby ensuring that the vehicle's low-voltage load 210 can continue to be powered. Therefore, the short-circuit protection module 160 can stabilize the voltages of the vehicle's low-voltage load 210 and the battery 220, limit the discharge of the battery 220 to the outside world, and avoid the sudden drop in the voltage of the battery 220 caused by the instantaneous increase in current, thereby ensuring that the vehicle's low-voltage load 210 maintains the normal working voltage and continues to operate. Furthermore, through the vehicle jump-start protection circuit provided by the present application, it is possible to ensure that the vehicle door locks can be unlocked, the in-vehicle emergency service telephone, and the vehicle's double-flash alarm and other low-voltage loads can continue to work effectively.

[0073] Through the vehicle jump-start protection circuit provided by the present application, a protection circuit formed by the charging current-limiting module 110, the short-circuit protection module 160, and the third overcurrent protection module 150 is established between the external power supply device and the vehicle's low-voltage load 210 and the battery 220. Multiple protections are carried out on the vehicle's low-voltage load 210 and the circuit where it is located from different angles, which can solve the problem of the instantaneous large current impact on the vehicle's low-voltage load 210 caused by the voltage difference between the external power supply device and the power-deficient electrical system in the vehicle, protect the vehicle's low-voltage load 210 and the battery 220, and will not damage the in-vehicle electronic devices, and can ensure the continuous and effective operation of the vehicle's low-voltage load 210 and the battery 220.

[0074] In one embodiment, the third overcurrent protection module 150 includes a third resettable fuse 151. One end of the third resettable fuse 151 is connected to the vehicle's low-voltage load 210 and the battery 220. The other end of the third resettable fuse 151 is connected to one end of the charging current-limiting module 110 and one end of the short-circuit protection module 160. By setting the third resettable fuse 151 on the main path of the vehicle jump-start protection circuit, overcurrent protection is carried out on the vehicle jump-start protection circuit from the main path area to prevent sudden overcurrent from damaging the circuit and the load, further improving the reliability of the vehicle jump-start protection circuit.

[0075] In one embodiment, the third resettable fuse 151 may be the same as the second resettable fuse 141. The present application does not make specific limitations and can be adjusted according to the actual application scenario to be applicable to different types of vehicle low-voltage loads 210 and batteries 220.

[0076] In one embodiment, the charging current limiting module 110 includes a first diode 111. The cathode end of the first diode 111 is connected to the other end of the third resettable fuse 151 and one end of the short-circuit protection module 160. The anode end of the first diode 111 is connected to the other end of the short-circuit protection module 160 and is connected to an external power supply device through an external power connection terminal a. The relevant description of the first diode 111 can refer to the relevant description in the above embodiment.

[0077] In one embodiment, the short-circuit protection module 160 includes a current stabilizing resistor 162 and an inductor 161. One end of the current stabilizing resistor 162 is connected to one end of the charging current limiting module 110. One end of the inductor 161 is connected to the other end of the current stabilizing resistor 162. The other end of the inductor 161 is connected to the other end of the charging current limiting module 110, and it can also be understood that the other end of the inductor 161 is connected to the anode end of the first diode 111. The current stabilizing resistor 162 and the inductor 161 are connected in series. The cathode end of the first diode 111 is connected to one end of the current stabilizing resistor 162 and the other end of the third resettable fuse 151. The anode end of the first diode 111 is connected to the other end of the inductor 161 and is connected to an external power supply device through an external power connection terminal a.

[0078] When the external power supply device supplies power, the inductor 161 will store energy to generate an induced current. When the external power supply device is disconnected, the induced current will not disappear in a short time. The inductor 161 and the current stabilizing resistor 162 are connected in series. Through the current stabilizing resistor 162, it is possible to prevent the induced electromotive force generated by the inductor 161 from damaging the vehicle low-voltage load 210, which plays a protective role for the vehicle low-voltage load 210 and the battery 220, and thus can ensure the continuous power supply of the vehicle low-voltage load 210. Through the short-circuit protection circuit formed by the current stabilizing resistor 162 and the inductor 161, the vehicle low-voltage load 210 and the battery 220 can operate continuously and stably, avoiding problems such as unstable performance, failure, or damage caused by current fluctuations.

[0079] Please refer to Figure 6, in one embodiment, the vehicle jump - start protection circuit further includes a shock - absorbing module 170. One end of the shock - absorbing module 170 is connected to one end of the short - circuit protection module 160. The other end of the shock - absorbing module 170 is connected to the other end of the short - circuit protection module 160. The shock - absorbing module 170 is used to consume and release the induced electromotive force generated by the short - circuit protection module 160 when the external power supply device ends power supply, so as to protect the vehicle's low - voltage load 210. In one embodiment, the shock - absorbing module 170 includes one or more elements of a capacitor and a resistor, which can be set according to the actual application scenario. The shock - absorbing module 170 is connected in parallel across the two ends of the short - circuit protection module 160. When the external power supply device supplies power to the vehicle's low - voltage load 210 and the battery 220 through the external jump - start terminal a, the current flowing through the inductor 161 accumulates energy to generate an induced electromotive force. When the external power supply device is disconnected, the shock - absorbing module 170 can reduce the oscillation generated by the induced electromotive force accumulated in the inductor 161, further improving the stability of the vehicle jump - start protection circuit, protecting the vehicle's low - voltage load 210, and extending its service life.

[0080] In one embodiment, the shock - absorbing module 170 includes a third resistor 171 and a capacitor 172. The third resistor 171 can consume the induced electromotive force generated by the inductor 161. The charging and discharging characteristics of the capacitor 172 are used to consume or suppress the induced electromotive force generated by the inductor 161, thereby reducing the amplitude of the oscillation or making the oscillation decay and stabilize as soon as possible. One end of the capacitor 172 is connected to the other end of the third resettable fuse 151, the cathode end of the first diode 111, and one end of the current - stabilizing resistor 162. The other end of the capacitor 172 is connected to one end of the third resistor 171. The other end of the third resistor 171 is connected to the anode end of the first diode 111 and the other end of the inductor 161. The third resistor 171 and the capacitor 172 are connected in series and are connected in parallel across the two ends of the short - circuit protection module 160. One end of the capacitor 172 is connected to the other end of the third resettable fuse 151, the cathode end of the first diode 111, and one end of the current - stabilizing resistor 162. The other end of the third resistor 171 is connected to the anode end of the first diode 111 and the other end of the inductor 161, and is connected to the external power supply device through the external jump - start terminal a. By connecting the third resistor 171 and the capacitor 172 in series, the oscillation generated in the vehicle jump - start protection circuit can be reduced, making the circuit work more stable and reliable, and reducing accidental failures or errors caused by oscillation.

[0081] Please refer to Figure 7, in one embodiment, the charging current limiting module 110 includes a first zener diode 113. The cathode end of the first zener diode 113 is connected to one end of the third resistor 171, one end of the current stabilizing resistor 162, and the other end of the third resettable fuse 151. One end of the capacitor 172 is connected to the other end of the third resistor 171. The anode end of the first zener diode 113 is connected to the other end of the capacitor 172 and the other end of the inductor 161. The charging current limiting module 110 may include a zener diode or a common diode. By connecting the first zener diode 113 in parallel across both ends of the short-circuit protection module 160, it is possible to stabilize the oscillation generated by the inductor 161, respond relatively quickly to voltage changes, and adjust in a timely manner to maintain a stable voltage. Furthermore, the vehicle jump-start protection circuit becomes more stable and reliable during the power supply process, providing a more stable and reliable power supply voltage for the vehicle's low-voltage load 210 and the battery 220, so that the vehicle's low-voltage load 210 can operate stably.

[0082] Please refer to Figure 8 , in one embodiment, the vehicle jump-start protection circuit further includes a voltage stabilizing module 180. One end of the voltage stabilizing module 180 is connected to one end of the short-circuit protection module 160. The other end of the voltage stabilizing module 180 is connected to the other end of the short-circuit protection module 160. The voltage stabilizing module 180 is used to stabilize the voltage across the short-circuit protection module 160. In one embodiment, the voltage stabilizing module 180 includes one or more components such as a zener diode and a resistor, which can be set according to the actual application scenario. The voltage stabilizing module 180 is connected in parallel across both ends of the short-circuit protection module 160 and also across both ends of the charging current limiting module 110. When an external power supply device supplies power to the vehicle's low-voltage load 210 and the battery 220 through the external jump-start terminal a, the current flowing through the inductor 161 accumulates energy. When the external power supply device is disconnected, the induced electromotive force accumulated by the inductor 161 generates oscillations. The voltage stabilizing module 180 can stabilize the oscillations generated in the circuit where the inductor 161 is located, making the voltage of the vehicle jump-start protection circuit more stable. Furthermore, it can provide a more stable and reliable power supply voltage for the vehicle's low-voltage load 210 and the battery 220, so that the vehicle's low-voltage load 210 can operate stably. At the same time, the voltage stabilizing module 180 can protect the components in the vehicle jump-start protection circuit to prevent damage to the components due to excessive or too low voltage.

[0083] In one embodiment, the voltage stabilizing module 180 includes a second zener diode 181. The cathode end of the second zener diode 181 is connected to the cathode end of the first diode 111, one end of the current stabilizing resistor 162, and the other end of the third resettable fuse 151. The second zener diode 181 is connected in parallel across both ends of the short-circuit protection module 160, which can stabilize the oscillation generated by the inductor 161, respond relatively quickly to voltage changes, and adjust in a timely manner to maintain a stable voltage. Furthermore, the vehicle jump-start protection circuit becomes more stable and reliable during the power supply process.

[0084] Please refer to Figure 9 In one embodiment, the vehicle jump-start protection circuit includes a third overcurrent protection module 150, a charging current limiting module 110, a short-circuit protection module 160, a shock absorption module 170, and a voltage stabilization module 180. One end of the third overcurrent protection module 150 is connected to the vehicle's low-voltage load 210 and the battery 220. The other end of the third overcurrent protection module 150 is connected to one end of the voltage stabilization module 180, one end of the charging current limiting module 110, one end of the shock absorption module 170, and one end of the short-circuit protection module 160. The other ends of the voltage stabilization module 180, the charging current limiting module 110, the shock absorption module 170, and the short-circuit protection module 160 are connected together.

[0085] The third overcurrent protection module 150 includes a third resettable fuse 151. The charging current limiting module 110 includes a first diode 111. The short-circuit protection module 160 includes a current stabilizing resistor 162 and an inductor 161. The shock absorption module 170 includes a third resistor 171 and a capacitor 172. The voltage stabilization module 180 includes a second zener diode 181. One end of the third resettable fuse 151 is connected to the vehicle's low-voltage load 210 and the battery 220. The other end of the third resettable fuse 151 is connected to the cathode end of the second zener diode 181, the cathode end of the first diode 111, one end of the third resistor 171, and one end of the current stabilizing resistor 162. The anode end of the second zener diode 181 is connected to the anode end of the first diode 111, the other end of the capacitor 172, and the other end of the inductor 161.

[0086] When the battery 220 consumes a large amount of power, for example, when the vehicle has been parked for a long time and the vehicle's low-voltage load 210 such as the hazard lights, headlights, and air conditioner consumes a lot of power, it is necessary to supply power to the vehicle's low-voltage load 210 and the battery 220 through an external power supply device. The positive electrode of the external power supply device required for external rescue is connected to the external jump-start wiring terminal a. The external current provided by the external power supply device required for external rescue will supply power to the vehicle's low-voltage load 210 and the battery 220 through the first diode 111, the second zener diode 181, the inductor 161, and the current stabilizing resistor 162, which can effectively limit the current impact of the external power supply device required for external rescue on the vehicle's low-voltage electrical system, effectively reduce the power impact during jump-starting, ensure the safety of the vehicle's low-voltage electrical system, and thus enable the vehicle's low-voltage load 210 and the battery 220 to work continuously and effectively.

[0087] When the vehicle is flashed with software during the production stage, it discharges through the current stabilizing resistor 162 and the inductor 161 to provide an initial detection voltage to the external power supply device required for software flashing, and supplies power to the external power supply device required during software flashing, so as to detect the voltage provided by the battery 220 and ensure whether it is the vehicle low-voltage voltage provided by the battery 220. When the external power supply device required during software flashing confirms that the voltage at this time is the vehicle low-voltage voltage provided by the battery 220, it starts the process of flashing the vehicle's software during the production stage. Furthermore, the required external power supply device supplies low-voltage power to the vehicle low-voltage load 210 and the battery 220 through the first diode 111, the second voltage stabilizing diode 181, the inductor 161, and the current stabilizing resistor 162, so as to ensure that a stable voltage is provided and the vehicle low-voltage power supply is not cut off when the vehicle's software is flashed during the production stage.

[0088] When the vehicle collides, the external power connection terminal a will come into contact with the vehicle body short-circuit grounding terminal b. The vehicle low-voltage load 210 and the battery 220 will have a short-circuit condition with the vehicle body through the inductor 161 and the current stabilizing resistor 162, generating a large amount of current. At this time, when the vehicle collides, the third resettable fuse 151 can be caused to disconnect after the current stabilizes through the inductor 161 and the current stabilizing resistor 162, so as to ensure that the vehicle low-voltage load 210 can continue to be powered. Or, when the vehicle collides, the current of the inductor 161 will exceed the allowable current, and then the inductor 161 will disconnect, so as to ensure that the vehicle low-voltage load 210 can continue to be powered. Therefore, through the inductor 161 and the current stabilizing resistor 162, the voltages of the vehicle low-voltage load 210 and the battery 220 can be stabilized, the discharge of the battery 220 to the outside can be limited, and the sudden drop of the voltage of the battery 220 caused by the instantaneous increase of the current can be avoided, so as to ensure that the vehicle low-voltage load 210 maintains the normal working voltage and continues to work. Furthermore, through the vehicle power connection protection circuit provided by the present application, it can ensure that low-voltage loads such as the unlocking of the vehicle door lock, the in-vehicle emergency service phone, and the vehicle double-flash alarm can continue to work effectively.

[0089] When the vehicle is connected to an external power supply device or collides and is short-circuited, through the vehicle power connection protection circuit provided by the present application, the low-voltage electrical components in the vehicle can be effectively protected, and the problem of burning out low-voltage electronic components in the case of excessive current or short circuit is solved.

[0090] The present application provides a vehicle, including the vehicle power connection protection circuit in any one of the above embodiments. The vehicle power connection protection circuit and the battery 220 are arranged in the front cabin of the vehicle. When emergency power connection is required, the battery wiring is directly removed for power connection. The vehicle power connection protection circuit is arranged close to the battery 220, which can reduce the procedures during power connection and make the placement position of the battery 220 more flexible.

[0091] The vehicle jump-start protection circuit is fixed by a plastic support frame. The vehicle jump-start protection circuit is connected to the vehicle's low-voltage electrical system and is connected to the vehicle's low-voltage load 210 and battery 220. The connecting wires, external jump-start connection terminals a, and body short-circuit grounding terminal b are arranged in the vehicle's emergency jump-start area to meet the layout position requirements of the production end and after-sales, and can be set according to actual situations.

[0092] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. Each functional module in the embodiment can be integrated into a processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware. In addition, the specific names of each functional module are only for the convenience of mutual distinction and do not limit the protection scope of this application.

[0093] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. In the embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there can be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0094] The modules described as separate components may or may not be physically separated, and the components shown may or may not be physical modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0095] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of this application, and should all be included in the protection scope of this application.

Claims

1. A vehicle jump-start protection circuit, characterized in that, Comprising: A charging current limiting module, one end of the charging current limiting module is used to connect to the vehicle low-voltage load and the battery, and the other end of the charging current limiting module is used to connect to an external power supply device. The charging current limiting module is used to unidirectionally limit the current in the power supply circuit when the external power supply device supplies power to the vehicle low-voltage load and the battery. A first overcurrent protection module, one end of the first overcurrent protection module is connected to one end of the charging current limiting module, and the other end of the first overcurrent protection module is connected to the other end of the charging current limiting module. The first overcurrent protection module is used to protect the vehicle low-voltage load against overcurrent.

2. The vehicle jump-start protection circuit according to claim 1, wherein, The vehicle jump-start protection circuit further comprises: A discharging current limiting module, one end of the discharging current limiting module is connected to one end of the charging current limiting module, and the other end of the discharging current limiting module is connected to one end of the first overcurrent protection module; The discharging current limiting module is used to unidirectionally limit the current in the discharging circuit when the vehicle is being software flashed during the production stage, so as to activate the external power supply device required for software flashing.

3. The vehicle jump-start protection circuit according to claim 1, characterized in that, The vehicle jump-start protection circuit further comprises: A second overcurrent protection module, one end of the second overcurrent protection module is used to connect to the vehicle low-voltage load and the battery, and the other end of the second overcurrent protection module is connected to one end of the charging current limiting module and one end of the first overcurrent protection module. The second overcurrent protection module is used to protect the vehicle low-voltage load against overcurrent.

4. The vehicle jump-start protection circuit according to claim 1, characterized in that, The charging current limiting module comprises: A first diode, the anode terminal of the first diode is used to connect to the external power supply device, and the cathode terminal of the first diode is used to connect to the vehicle low-voltage load and the battery.

5. The vehicle jump-start protection circuit according to claim 2, characterized in that, The discharging current limiting module comprises: A second diode, the anode terminal of the second diode is used to connect to the vehicle low-voltage load and the battery, and the cathode terminal of the second diode is used to connect to one end of the first overcurrent protection module; The first overcurrent protection module comprises: A first resettable fuse, one end of the first resettable fuse is connected to the cathode terminal of the second diode, and the other end of the first resettable fuse is connected to the other end of the charging current limiting module.

6. A vehicle jump-start protection circuit, characterized in that, Comprising: A third overcurrent protection module, one end of the third overcurrent protection module is used to connect to the vehicle low-voltage load and the battery, and the third overcurrent protection module is used to protect the vehicle low-voltage load against overcurrent; A charging current limiting module, one end of the charging current limiting module is connected to the other end of the third overcurrent protection module, and the other end of the charging current limiting module is used to connect to an external power supply device. The charging current limiting module is used to unidirectionally limit the current in the power supply circuit when the external power supply device supplies power to the vehicle low-voltage load and the battery. A short-circuit protection module, one end of the short-circuit protection module is connected to one end of the charging current limiting module and the other end of the third overcurrent protection module, and the other end of the short-circuit protection module is connected to the other end of the charging current limiting module. The short-circuit protection module is used to protect the vehicle low-voltage load against short circuit.

7. The vehicle jump-start protection circuit according to claim 6, wherein, The vehicle jump-start protection circuit further comprises: A shock-absorbing module, one end of the shock-absorbing module is connected to one end of the short-circuit protection module, and the other end of the shock-absorbing module is connected to the other end of the short-circuit protection module. The shock-absorbing module is used to consume and release the induced electromotive force generated by the short-circuit protection module when the external power supply device ends power supply, so as to protect the low-voltage load of the whole vehicle.

8. The vehicle jump-start protection circuit according to claim 6, wherein The vehicle jump-start protection circuit further includes: A voltage stabilizing module, one end of the voltage stabilizing module is connected to one end of the short-circuit protection module, and the other end of the voltage stabilizing module is connected to the other end of the short-circuit protection module. The voltage stabilizing module is used to stabilize the voltage across the short-circuit protection module.

9. The vehicle jump-start protection circuit according to claim 6, wherein, The short-circuit protection module includes: A current stabilizing resistor, one end of the current stabilizing resistor is connected to one end of the charging current limiting module; [[ID= 10. A vehicle, characterized in that, ​

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