A fast charging protection circuit and a vehicle

Abstract

The application provides a fast charging protection circuit and a vehicle, wherein the fast charging protection circuit comprises: a first main branch circuit, the first main branch circuit comprising a first branch circuit and a second branch circuit, and the second branch circuit being in parallel with the first branch circuit; a second main branch circuit, the second main branch circuit comprising a third branch circuit and a fourth branch circuit, and the fourth branch circuit being in parallel with the third branch circuit; a switching switch, the switching switch being connected with the first, second, third and fourth branch circuits respectively, and being used for controlling the on and off of each branch circuit; when the switching switch is in a first state, the first branch circuit and the third branch circuit are both on, and the second branch circuit and the fourth branch circuit are both off; when the switching switch is in a second state, the first branch circuit and the third branch circuit are off, and the second branch circuit and the fourth branch circuit are on. Different protection circuits can be selected by different states of the switching switch, the mode is more flexible, the double protection effect of the same protection circuit is realized, and the design and development cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicles, and in particular to a fast charging protection circuit and vehicle. Background Technology

[0002] As we all know, new energy vehicles rely on power batteries as their power source. When the power battery's charge is insufficient, it needs to be replenished promptly to meet range requirements. However, when using charging stations for fast charging, the specifications of the charging stations and the vehicle's environment can cause different types of interference to the vehicle's controller. Therefore, it is necessary to consider how to flexibly configure the vehicle's protection circuitry based on these varying electromagnetic interferences. Summary of the Invention

[0003] The purpose of this invention is to provide a fast charging protection circuit and a vehicle, so as to enable flexible configuration of the vehicle's protection circuit.

[0004] To achieve the above objectives, the present invention provides a fast charging protection circuit, comprising: a first main branch, the first main branch including a first branch and a second branch, wherein the second branch is connected in parallel with the first branch; a second main branch, the second main branch including a third branch and a fourth branch, wherein the fourth branch is connected in parallel with the third branch; and a switching switch, the switching switch being connected to the first branch, the second branch, the third branch, and the fourth branch respectively, for controlling the continuity and disconnection of each branch, wherein, when the switching switch is in a first state, the first branch and the third branch are both continuous, and the second branch and the fourth branch are both disconnected; when the switching switch is in a second state, the first branch and the third branch are both disconnected, and the second branch and the fourth branch are both continuous.

[0005] Optionally, a first resistor R1 is provided on the first branch, and a second resistor R2 is provided on the second branch.

[0006] Optionally, the first main branch further includes a third transient diode D3, and a first inductor is provided on the second branch. The second end of the first inductor is connected to the second end of the first resistor R1 and the first end of the third transient diode D3, respectively. The second end of the third transient diode D3 is grounded, and the first end of the first inductor is connected to the first end of the first resistor R1.

[0007] Optionally, the second main branch further includes a fourth transient diode D4. A second inductor is provided on the fourth branch. The second end of the second inductor is connected to the second end of the second resistor R2 and the first end of the fourth transient diode D4. The second end of the fourth transient diode D4 is grounded, and the first end of the second inductor is connected to the first end of the second resistor R2.

[0008] Optionally, the first main branch further includes a fifth branch, and the second main branch further includes a sixth branch; a second capacitor C2 is provided on the fifth branch, the first end of the second capacitor C2 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, and the second end of the second capacitor C2 is grounded; a third capacitor C3 is provided on the sixth branch, the first end of the second capacitor C3 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the third capacitor C3 is grounded.

[0009] Optionally, the first main branch further includes a seventh branch, and the second main branch further includes an eighth branch; a first transient diode D1 is provided on the seventh branch, the first end of the first transient diode D1 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, and the second end of the first transient diode D1 is grounded; a second transient diode D2 is provided on the eighth branch, the first end of the second transient diode D2 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the second transient diode D2 is grounded.

[0010] Optionally, the first main branch further includes a ninth branch, and the second main branch further includes a tenth branch; a fourth resistor R4 is provided on the ninth branch, the first end of the fourth resistor R4 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, the second end of the fourth resistor R4 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; a third resistor R3 is provided on the tenth branch, the first end of the third resistor R3 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the third resistor R3 is connected to the first end of the first capacitor C1.

[0011] Another embodiment of the present invention provides a vehicle including the fast charging protection circuit described above.

[0012] Optionally, the vehicle includes a vehicle controller, which includes a connector, a CAN chip, and a microcontroller chip. One end of the CAN chip and the microcontroller chip are connected via a communication line, and the other end of the CAN chip is connected to the second end of the first main branch and the second end of the second main branch, respectively. The first end of the first main branch and the first end of the second main branch are respectively connected to the connector.

[0013] The above-described technical solution of the present invention has at least the following beneficial effects:

[0014] The fast-charging protection circuit of this invention allows for the selection of different protection circuits under varying EMC environments by switching the different states of the switch. This provides greater flexibility and achieves dual protection with the same circuit, reducing design and development costs. Furthermore, in environments with favorable EMC conditions, only primary protection can be selected. This reduces the number of components used in secondary protection, thereby extending the lifespan of those components. Attached Figure Description

[0015] Figure 1 This is one of the circuit principle schematic diagrams provided in the embodiments of the present invention;

[0016] Figure 2 This is a second schematic diagram of a circuit principle provided in an embodiment of the present invention;

[0017] Figure 3 A third schematic diagram of a circuit principle provided in an embodiment of the present invention;

[0018] Figure 4 A fourth schematic diagram of a circuit principle provided in an embodiment of the present invention;

[0019] Figure 5 This is the fifth circuit schematic diagram provided as an embodiment of the present invention.

[0020] Symbol explanation:

[0021] 1. First main branch road; 11. First branch road; 12. Second branch road; 13. Fifth branch road

[0022] 14 Seventh Branch Road 15 Ninth Branch Road 2 Second Main Branch Road 21 Third Branch Road

[0023] 22 Fourth Branch Road 23 Sixth Branch Road 24 Eighth Branch Road 25 Tenth Branch Road

[0024] 3. Switch 31. First switch 32. Second switch Detailed Implementation

[0025] To make the technical problems, technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this invention. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0026] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0027] In various embodiments of the present invention, it should be understood that the sequence number of each process described below does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0028] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the embodiments provided by this invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0030] See Figure 1(The position of the switch is not shown). A preferred embodiment of the present invention provides a fast charging protection circuit, including: a first main branch 1, which includes a first branch 11 and a second branch 12, and the second branch 12 is connected in parallel with the first branch 11; a second main branch 2, which includes a third branch 21 and a fourth branch 22, and the fourth branch 22 is connected in parallel with the third branch 21; and a switch 3, which is connected to the first branch 11, the second branch 12, the third branch 21, and the fourth branch 22 respectively, for controlling the continuity and disconnection of each branch, wherein, when the switch 3 is in a first state, the first branch 11 and the third branch 21 are both continuous, and the second branch 12 and the fourth branch 22 are both disconnected; when the switch 3 is in a second state, the first branch 11 and the third branch 21 are both disconnected, and the second branch 12 and the fourth branch 22 are both continuous.

[0031] It should be noted that the fast-charging protection circuit of the present invention is applied to electric vehicles. In the fast-charging protection circuit, the first main branch 1 can be, for example, a high-level signal line of a fast-charging controller area network (CAN) circuit, denoted by CANH. The second main branch 2 can be, for example, a low-level signal line of a fast-charging CAN circuit, denoted by CANL. When fast-charging an electric vehicle, fast-charging CAN signals are generated on both CANH and CANL. Optionally, the fast-charging protection circuit can also be referred to as a fast-charging CAN circuit.

[0032] When the first branch circuit 11 and the third branch circuit 21 are in the conducting state, the fast charging protection circuit provides primary protection. When the second branch circuit 12 and the fourth branch circuit 22 are in the conducting state, the fast charging protection circuit provides both primary and secondary protection. Specifically, the primary protection of the fast charging protection circuit, under conditions of good electromagnetic compatibility (EMC), can withstand the impact of abnormally high voltage from the charging station. The secondary protection of the fast charging protection circuit, under conditions of poor EMC, can further enhance the protection against the impact of abnormally high voltage from the charging station.

[0033] The fast-charging protection circuit of this invention allows for the selection of different protection circuits under varying EMC environments by switching the different states of the switch. This provides greater flexibility and achieves dual protection with the same circuit, reducing design and development costs. Furthermore, in environments with favorable EMC conditions, only primary protection can be selected. This reduces the number of components used in secondary protection, thereby extending the lifespan of those components.

[0034] In one implementation, such as Figure 2 As shown, a switch 3 is respectively installed on the first main branch 1 and the second main branch 2. The switch 3 on the first main branch can be represented by a first switch 31, and the switch 3 on the second main branch can be represented by a second switch 32. In the first main branch 1, the first terminal of the first switch 31 is connected to the first terminal of the first resistor R1 and the first terminal of the first inductor, respectively, and the second terminal of the first switch 31 is connected to the first terminal of the fourth resistor R4. In the second main branch, the first terminal of the second switch 32 is connected to the first terminal of the second resistor R2 and the first terminal of the second inductor, respectively, and the second terminal of the second switch 32 is connected to the first terminal of the third resistor R3.

[0035] In one example, the first switch 31 and the second switch 32 can be connected to a control device, which controls the switching of the states of the first switch 31 and the second switch 32. Furthermore, the control device can acquire the electromagnetic interference intensity in the surrounding environment. When the electromagnetic interference intensity is determined to be less than or equal to a first preset electromagnetic interference intensity, the control device can control both the first switch 31 and the second switch 32 to be in a first state, thus providing primary protection for the fast charging protection circuit. When the electromagnetic interference intensity is determined to be greater than the first preset electromagnetic interference intensity, the control device can control both the first switch 31 and the second switch 32 to be in a second state, thus providing secondary protection for the fast charging protection circuit. Optionally, the switching of the states of the first switch 31 and the second switch 32 can also be manually controlled.

[0036] In one implementation, the first terminal of the first switch 31 can also be connected to the second terminals of the first resistor R1 and the first inductor, respectively, and the second terminal of the first switch 31 is connected to the first terminal of the third transient diode D3. The first terminal of the second switch 32 is connected to the second terminals of the second resistor R2 and the second inductor, respectively, and the second terminal of the second switch 32 is connected to the first terminal of the fourth transient diode D4. Whether the first switch 31 and the second switch 32 control the first branch 11 and the third branch 21 to conduct simultaneously, or control the second branch 12 and the fourth branch 22 to conduct simultaneously, the fast charging CAN signal in the fast charging protection circuit will pass through the third transient diode D3 and the fourth transient diode D4.

[0037] See Figure 3 In another implementation, the second terminal of the first inductor is connected to the first terminal of the third transient diode D3 and the first terminal of the first switch 31, respectively, and the second terminal of the first resistor R1 is connected to the first terminal of the first switch 31. The second terminal of the second inductor is connected to the first terminal of the fourth transient diode D4 and the first terminal of the second switch 32, respectively, and the second terminal of the second resistor R2 is connected to the first terminal of the second switch 32. The second terminals of the third transient diode D3 and the fourth transient diode D4 are grounded. When the first branch 11 and the third branch 21 are simultaneously turned on by the first switch 31 and the second switch 32, the fast charging CAN signal in the fast charging protection circuit passes through the first resistor R1 and the second resistor R2. When the second branch 12 and the fourth branch 22 are simultaneously turned on by the first switch 31 and the second switch 32, the fast charging CAN signal in the fast charging protection circuit passes through the first inductor, the third transient diode D3, the second inductor, and the fourth transient diode D4. In other words, the fast charging CAN signal in the fast charging protection circuit will only pass through the third transient diode D3 and the fourth transient diode D4 when both the second branch 12 and the fourth branch 22 are simultaneously activated. It should be noted that when the switch 3 is in the first state, the fast charging protection circuit... Figure 4 As shown. When switch 3 is in the second state, the fast charging protection circuit is as follows. Figure 5 As shown.

[0038] In the fast charging protection circuit of this embodiment, a first resistor R1 is provided on the first branch 11, and a second resistor R2 is provided on the second branch 12.

[0039] It should be noted that the resistance values ​​of the first resistor R1 and the second resistor R2 are both zero ohms. Thus, when the fast charging protection circuit is printed on the circuit board, the first resistor R1 and the second resistor R2 can be used as jumpers to avoid high-frequency interference caused by using jumper pins.

[0040] In the fast charging protection circuit of this embodiment, the first main branch 1 further includes a third transient diode D3, and a first inductor is provided on the second branch 12. The second end of the first inductor is connected to the second end of the first resistor R1 and the first end of the third transient diode D3, respectively. The second end of the third transient diode D3 is grounded, and the first end of the first inductor is connected to the first end of the first resistor R1.

[0041] In the fast charging protection circuit of this embodiment, the second main branch 2 further includes a fourth transient diode D4. A second inductor is provided on the fourth branch 22. The second end of the second inductor is connected to the second end of the second resistor R2 and the first end of the fourth transient diode D4. The second end of the fourth transient diode D4 is grounded, and the first end of the second inductor is connected to the first end of the second resistor R2.

[0042] It should be noted that the first inductor and the second inductor together form the common-mode inductor L1, which can suppress common-mode noise generated in the fast-charging protection circuit. The third transient diode D3 and the fourth transient diode D4 can jointly absorb the spikes passing through the common-mode inductor L1. The common-mode inductor L1, the third transient diode D3, and the fourth transient diode D4 together provide secondary protection. After secondary protection, the voltage in the fast-charging protection circuit can be clamped within the range that the control chip can withstand.

[0043] Optionally, the fourth transient diode D4 can be exactly the same as the third transient diode D3, that is, the third transient diode D3 can be used to replace the fourth transient diode D4.

[0044] Optionally, the first resistor R1 and the second resistor R2 are two terminating matching resistors for the fast charging CAN circuit (these are two terminating matching resistors that should be present on the CAN network, and are installed at the two farthest ends of the physical wiring harness. Whether to install these resistors in this circuit depends on the installation position of the vehicle controller of the entire CAN network, but the PCB board needs to reserve the installation position of these terminating resistors).

[0045] In the fast charging protection circuit of this embodiment, the first main branch 1 further includes a fifth branch 13, and the second main branch 2 further includes a sixth branch 23; a second capacitor C2 is provided on the fifth branch 13, the first end of the second capacitor C2 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, and the second end of the second capacitor C2 is grounded; a third capacitor C3 is provided on the sixth branch 23, the first end of the second capacitor C3 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the third capacitor C3 is grounded.

[0046] It should be noted that when the fast charging signal passes through the second capacitor C2 and the third capacitor C3 respectively, the second capacitor C2 and the third capacitor C3 can perform electrostatic discharge (ESD) protection, which can prevent electrostatic discharge from damaging the fast charging protection circuit.

[0047] In the fast charging protection circuit of this embodiment, the first main branch 1 further includes a seventh branch 14, and the second main branch 2 further includes an eighth branch 24; a first transient diode D1 is provided on the seventh branch 14, the first end of the first transient diode D1 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, and the second end of the first transient diode D1 is grounded; a second transient diode D2 is provided on the eighth branch 24, the first end of the second transient diode D2 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the second transient diode D2 is grounded.

[0048] It should be noted that when the fast charging signal passes through the first transient diode D1 and the second transient diode D2 respectively, it can clamp the abnormal high voltage from the fast charging pile, thereby improving the ability of the fast charging protection circuit to resist abnormal high voltage.

[0049] In the fast charging protection circuit of this embodiment, the first main branch 1 further includes a ninth branch 15, and the second main branch 2 further includes a tenth branch 25; a fourth resistor R4 is provided on the ninth branch 15, the first end of the fourth resistor R4 is connected to the first end of the first resistor R1 and the first end of the first inductor respectively, the second end of the fourth resistor R4 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; a third resistor R3 is provided on the tenth branch 25, the first end of the third resistor R3 is connected to the first end of the second resistor R2 and the first end of the second inductor respectively, and the second end of the third resistor R3 is connected to the first end of the first capacitor C1.

[0050] It should be noted that when the fast charging signal passes through the fourth resistor R4, the third resistor R3, and the first capacitor C1 respectively, high-frequency signals can be filtered out, thereby avoiding interference from high-frequency signals.

[0051] Next, we will provide an overall explanation of the fast charging signal flow in the fast charging protection circuit when the vehicle is fast charging.

[0052] When the switch is in the first state, the fast charging signal and the abnormal high voltage that the fast charging pile may generate pass through the fifth branch 13, the seventh branch 14, the ninth branch 15, and the first branch 11 of the first main branch 1, and the sixth branch 23, the eighth branch 24, the tenth branch 25, and the third branch 21 of the second main branch 2 in sequence, thereby passing through ESD protection, first-level protection, and low-pass filtering, thus playing a protective role for the fast charging protection circuit.

[0053] When the switch is in the second state, the fast charging signal and the abnormal high voltage that the fast charging pile may generate pass through the fifth branch 13, the seventh branch 14, the ninth branch 15, and the second branch 12 of the first main branch 1, and the sixth branch 23, the eighth branch 24, the tenth branch 25, and the fourth branch 22 of the second main branch 2 in sequence, thereby passing through ESD protection, first-level protection, low-pass filtering, and second-level protection in sequence, further improving the protection function of the fast charging protection circuit.

[0054] Furthermore, in the fast charging protection circuit of this embodiment of the invention, a circuit-compatible design scheme can be adopted when designing the fast charging CAN circuit. The compatible design scheme is as follows: Figure 1 As shown.

[0055] In the compatibility design, the common-mode inductor L1 can be left unsoldered, while the two zero-ohm resistors R1 and R2 can be soldered. Since the fast-charging signal does not pass through the common-mode inductor L1, no glitches will be generated in the circuit, and the third transient diode D3 can be left unsoldered. If the common-mode inductor L1 is removed, the fast-charging CAN circuit only needs one level of protection to withstand the abnormally high voltage of the fast-charging station. The simplified circuit diagram of the first compatibility design is as follows: Figure 4 As shown, the components used in the first compatible design scheme can be generated in the first bill of materials. After soldering the PCB according to the simplified first bill of materials of the first compatible design scheme, an anti-pulse interference test is performed. The pulse waveforms before and after the first resistor R1 and the second resistor R2 are basically the same, and there are no glitches after the common mode inductor L1. There is no need to add a secondary protection circuit, which can ensure the withstand voltage capability of the fast charging CAN circuit.

[0056] Under harsh EMC conditions, the first resistor R1 and the second resistor R2 can be omitted, and the common-mode inductor L1 can be soldered instead. This results in a fast-charging CAN circuit design with two-stage protection. The simplified circuit diagram of the second compatible design is shown below. Figure 5 As shown, the components used in the second compatible design scheme can be generated in the second bill of materials. Therefore, the PCB board can be soldered according to the second bill of materials.

[0057] This invention, through a compatible design, allows the hardware circuit to be viewed as two separate circuits. This enables the development of vehicle control units (VCUs) suitable for various environments without modifying the PCB board, based on either the first or second bill of materials (BOM). By using a compatible circuit design, a single compatible circuit can be broken down into two different circuit schemes using the first and second BOMs.

[0058] The proposed solution has been verified through anti-pulse testing, and both solutions can withstand the abnormally high voltage surges from fast charging piles. In environments with good EMC performance, a third transient diode D3, which omits the common-mode inductor and secondary protection circuit, can be used. Based on actual test results, the project can select different design solutions for the VCU product using different bills of materials to achieve the optimal design effect.

[0059] Furthermore, by adopting a circuit-compatible design scheme for the fast-charging CAN circuit in the vehicle control unit (VCU), different design schemes can be selected by adjusting different bills of materials for the VCU products to achieve the optimal design effect. The design selection method is more flexible and reduces design and development costs.

[0060] Another embodiment of the present invention provides a vehicle including the fast charging protection circuit described above.

[0061] It should be noted that the vehicle uses the fast charging protection circuit described above, which can reduce the vehicle's development costs and improve its competitiveness in the market.

[0062] The vehicle described in this embodiment of the invention includes a vehicle controller, which includes a connector, a CAN chip, and a microcontroller (MCU) chip. One end of the CAN chip is connected to the microcontroller chip via a transceiver line, and the other end of the CAN chip is connected to the second end of a first main branch and the second end of a second main branch, respectively. The first end of the first main branch and the first end of the second main branch are respectively connected to the connector.

[0063] It should be noted that by connecting the CAN chip to the first main branch and the second main branch respectively, the CAN chip can be protected from abnormally high voltage impacts, thereby effectively preventing the CAN chip and the microcontroller chip from burning out and improving the service life of the CAN chip and the microcontroller chip.

[0064] Optionally, the CAN chip can be represented by U1, and the MCU chip can be represented by U2.

[0065] Furthermore, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0066] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0067] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fast charging protection circuit, characterized in that, include: The first main branch road includes a first branch road and a second branch road, and the second branch road is connected in parallel with the first branch road; The second main branch road includes a third branch road and a fourth branch road, wherein the fourth branch road is connected in parallel with the third branch road; A switching switch is connected to the first branch, the second branch, the third branch, and the fourth branch respectively, and is used to control the opening and closing of each branch. When the switching switch is in a first state, the first and third branch are both open, and the second and fourth branch are both closed. When the switching switch is in a second state, the first and third branch are both closed, and the second and fourth branch are both open. A first resistor R1 is provided on the first branch, and a second resistor R2 is provided on the second branch; The first main branch also includes a third transient diode D3. A first inductor is provided on the second branch. The second end of the first inductor is connected to the second end of the first resistor R1 and the first end of the third transient diode D3. The second end of the third transient diode D3 is grounded. The first end of the first inductor is connected to the first end of the first resistor R1. The second main branch also includes a fourth transient diode D4. A second inductor is provided on the fourth branch. The second end of the second inductor is connected to the second end of the second resistor R2 and the first end of the fourth transient diode D4. The second end of the fourth transient diode D4 is grounded, and the first end of the second inductor is connected to the first end of the second resistor R2.

2. The fast charging protection circuit according to claim 1, characterized in that, The first main branch road also includes a fifth branch road, and the second main branch road also includes a sixth branch road; A second capacitor C2 is provided on the fifth branch. The first end of the second capacitor C2 is connected to the first end of the first resistor R1 and the first end of the first inductor, respectively. The second end of the second capacitor C2 is grounded. A third capacitor C3 is provided on the sixth branch. The first end of the third capacitor C3 is connected to the first end of the second resistor R2 and the first end of the second inductor, respectively, and the second end of the third capacitor C3 is grounded.

3. The fast charging protection circuit according to claim 1, characterized in that, The first main branch road also includes a seventh branch road, and the second main branch road also includes an eighth branch road; A first transient diode D1 is provided on the seventh branch. The first end of the first transient diode D1 is connected to the first end of the first resistor R1 and the first end of the first inductor, respectively, and the second end of the first transient diode D1 is grounded. A second transient diode D2 is provided on the eighth branch. The first end of the second transient diode D2 is connected to the first end of the second resistor R2 and the first end of the second inductor, respectively, and the second end of the second transient diode D2 is grounded.

4. The fast charging protection circuit according to claim 1, characterized in that, The first main branch road also includes a ninth branch road, and the second main branch road also includes a tenth branch road; A fourth resistor R4 is provided on the ninth branch. The first end of the fourth resistor R4 is connected to the first end of the first resistor R1 and the first end of the first inductor. The second end of the fourth resistor R4 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded. A third resistor R3 is provided on the tenth branch. The first end of the third resistor R3 is connected to the first end of the second resistor R2 and the first end of the second inductor, respectively. The second end of the third resistor R3 is connected to the first end of the first capacitor C1.

5. A vehicle, characterized in that, Includes the fast charging protection circuit as described in any one of claims 1 to 4.

6. The vehicle according to claim 5, characterized in that, The vehicle includes a vehicle controller, which includes a connector, a CAN chip, and a microcontroller chip. One end of the CAN chip and the microcontroller chip are connected via a communication line. The other end of the CAN chip is connected to the second end of a first main branch and the second end of a second main branch, respectively. The first end of the first main branch and the first end of the second main branch are respectively connected to the connector.

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