A vehicle protection circuit, system, and vehicle

Abstract

The application provides a vehicle protection circuit, a system and a vehicle, and the vehicle protection circuit comprises: a first input end of an operational amplifier is connected with one end of a controlled circuit, a second input end of the operational amplifier is connected with the other end of the controlled circuit; a base of a first triode is connected with an output end of the operational amplifier, a collector of the first triode is connected with an input end of a control circuit; when the controlled circuit is in an abnormal state, the first input end of the operational amplifier is used for collecting a reverse electromotive force of the controlled circuit, and an enable signal is output based on the reverse electromotive force, and the enable signal makes the control circuit stop working; in this way, when the controlled circuit is abnormal, the vehicle protection circuit can intervene in the control circuit in time, so that the control circuit stops working in time, and the safety of the vehicle is ensured; and it can be seen that the vehicle protection circuit is simple in structure, and on the basis of ensuring safety, the cost of the vehicle can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle safety, and in particular to a vehicle protection circuit, a vehicle protection system and a vehicle. BACKGROUND

[0002] With the rapid development of intelligent vehicles, functional safety must be considered. As an important component of intelligent hardware circuits, the control circuit may continue to output an enable signal when the controlled circuit is in an abnormal state, which may cause the vehicle to lose control and even cause life and property loss.

[0003] In related technologies, multiple functional modules of the control circuit are generally used to control the output of the circuit to ensure vehicle safety. However, the control circuit is relatively complex and has a high cost.

[0004] Therefore, there is an urgent need for an effective and low-cost vehicle protection circuit to effectively protect the control circuit to solve the above problems. SUMMARY

[0005] To solve or partially solve the technical problem that the control circuit of the vehicle cannot be effectively protected, the embodiments of the present application provide a vehicle protection circuit, a vehicle protection system and a vehicle.

[0006] In a first aspect, the present application provides a vehicle protection circuit, which comprises:

[0007] an operational amplifier, a first input end of the operational amplifier being connected to one end of a controlled circuit, and a second input end of the operational amplifier being connected to the other end of the controlled circuit;

[0008] a first triode, a base of the first triode being connected to an output end of the operational amplifier, and a collector of the first triode being connected to an input end of a control circuit; wherein

[0009] When the controlled circuit is in an abnormal state, the operational amplifier is configured to:

[0010] collect a reverse electromotive force of the controlled circuit, and output an enable signal based on the reverse electromotive force, the enable signal being configured to control the control circuit to stop working.

[0011] In the above scheme, the vehicle protection circuit further comprises:

[0012] a first resistor, the first resistor being connected to the first input end of the operational amplifier;

[0013] a second resistor, the second resistor being connected to the second input end of the operational amplifier;

[0014] a third resistor connected in series between the output of the operational amplifier and the second input;

[0015] a fourth resistor connected in series between the first resistor and ground.

[0016] In the above scheme, the vehicle protection circuit further comprises:

[0017] a fifth resistor, one end of the fifth resistor being connected to the output of the operational amplifier, and the other end of the fifth resistor being connected to the base of the first transistor;

[0018] a sixth resistor connected in series between the other end of the fifth resistor and ground.

[0019] In the second aspect of the present application, a vehicle protection system is provided, the system comprising the vehicle protection circuit of any one of the first aspect, a control circuit, and a controlled circuit; wherein,

[0020] the control circuit is configured to receive an input signal sent by a control chip, and output a control signal to the controlled circuit based on the input signal;

[0021] the vehicle protection circuit is configured to, when the controlled circuit is in an abnormal state, collect a back electromotive force of the controlled circuit, and output an enable signal based on the back electromotive force, the enable signal being used to control the control circuit to stop working.

[0022] In the above scheme, the control circuit comprises:

[0023] a signal input circuit connected to the controlled circuit, configured to receive an input signal sent by a control chip;

[0024] a signal output circuit, a first output end of the signal output circuit being connected to one end of the controlled circuit, configured to output a control signal to the controlled circuit based on the input signal;

[0025] a signal sampling circuit connected to a second output end of the signal output circuit, configured to collect a working signal, and send the working signal to the control chip, so that the control chip judges whether the controlled circuit is normal according to the input signal and the working signal.

[0026] In the above scheme, the signal input circuit comprises:

[0027] a seventh resistor, one end of the seventh resistor being connected to a control chip;

[0028] a second transistor, a base of the second transistor being connected to the other end of the seventh resistor, and an emitter of the second transistor being grounded;

[0029] An eighth resistor, one end of the eighth resistor being connected with the base of the second triode;

[0030] A ninth resistor, one end of the ninth resistor being connected with the collector of the second triode.

[0031] The signal output circuit comprises:

[0032] A MOS transistor, a gate of the MOS transistor being connected with the other end of the ninth resistor, a source of the MOS transistor being connected with the power supply circuit, and a drain of the MOS transistor being connected with one end of the controlled circuit;

[0033] A first diode, arranged between the drain of the MOS transistor and the controlled circuit.

[0034] The signal sampling circuit comprises a tenth resistor, an eleventh resistor and a first capacitor;

[0035] The tenth resistor and the eleventh resistor are connected in series between the second end of the signal output circuit and the other end of the seventh resistor;

[0036] The first capacitor and the eleventh resistor are connected in parallel.

[0037] The vehicle protection circuit is specifically used for:

[0038] The first input end of the operational amplifier is used to collect the reverse electromotive force of the controlled circuit, and the enable signal is output if it is determined that the current of the first input end is greater than the current of the second input end;

[0039] The control circuit stops working based on the enable signal, the first triode being turned on, the second triode being turned off and the MOS transistor being turned off.

[0040] In a third aspect, the present application provides a vehicle, which comprises the vehicle protection system according to any one of the second aspect.

[0041] The application provides a vehicle protection circuit, a system and a vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to be a limitation on the application. Moreover, in the drawings, like reference numerals denote same or similar components.

[0043] In the drawings:

[0044] Figure 1 A schematic diagram of a frame structure of a vehicle protection system according to an embodiment of the application is shown;

[0045] Figure 2 A schematic diagram of a circuit structure of a vehicle protection system according to an embodiment of the application is shown;

[0046] Figure 3 A schematic diagram of a circuit structure of a corresponding protection system when the controlled component is a relay according to an embodiment of the application is shown.

[0047] Explanation of reference signs: 1-control circuit; 2-vehicle protection circuit; 3-controlled circuit; 4-control chip; 5-fault processing circuit; 21-signal input circuit; 22-signal output circuit; 23-signal sampling circuit; 24-power supply circuit; Q1-operational amplifier; S1-first transistor; S2-second transistor; S3-MOS tube; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor; R10-tenth resistor; R11-eleventh resistor; R12-twelfth resistor; A-first input end of Q1; B-second input end of Q1; C-input end of signal output circuit; D-output end of signal output circuit; E-gate of first transistor S1; C1-first capacitor; C2-second capacitor; C3-third capacitor. DETAILED DESCRIPTION

[0048] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0049] In order to better understand the technical solutions of the embodiments of the present application, the safety control system is introduced as follows, as shown in the figure, the system comprises: a control circuit 1, a vehicle protection circuit 2, a controlled circuit 3 and a control chip 4. Figure 1 As shown in the figure, the system comprises: a control circuit 1, a vehicle protection circuit 2, a controlled circuit 3 and a control chip 4.

[0050] The control circuit 1 is used for receiving an input signal sent by the control chip 4 and outputting a control signal to the controlled circuit 3 based on the input signal.

[0051] The vehicle protection circuit 2 is used for collecting a reverse electromotive force of the controlled circuit 3 when the controlled circuit 3 is in an abnormal state and outputting an enable signal based on the reverse electromotive force, the enable signal being used for controlling the control circuit to stop working.

[0052] In the embodiment, the input end of the control circuit 1 is connected with the control chip 4, and the output end of the control circuit 1 is connected with the controlled circuit 3. The input end of the protection circuit 2 is connected with the controlled circuit 3 and the control circuit 1 respectively.

[0053] The control chip 4 sends an input signal to the control circuit 1, and the control circuit 1 drives the controlled circuit 3 to work based on the input signal. In the process of working of the controlled circuit 3, the control circuit 1 samples a working signal in real time and sends the collected working signal to the control chip 4, and the control chip 4 is used for judging whether the controlled circuit 3 is normal based on the working signal and the input signal.

[0054] The control chip 4 is specifically used for:

[0055] If it is determined that the input signal is high and it is determined that the working signal is high, it is determined that the controlled circuit 3 is normal; or,

[0056] If it is determined that the input signal is low and it is determined that the working signal is low, it is determined that the controlled circuit 3 is normal.

[0057] If it is determined that the input signal is high and it is determined that the working signal is low, it is determined that the controlled circuit 3 is abnormal.

[0058] If it is determined that the controlled circuit 3 is abnormal, the vehicle protection circuit 2 is used to collect the reverse electromotive force of the controlled circuit 3, and output an enable signal based on the reverse electromotive force, and the enable signal is used to make the control circuit 1 stop working.

[0059] In an embodiment, with continued reference to Figure 1 , the system further comprises a fault processing circuit 5. If the control chip 4 determines that the controlled circuit 3 is abnormal, a fault signal is sent to the fault processing circuit 5, and the fault processing circuit 5 gives corresponding fault processing operations based on the fault signal, such as shutdown processing or lighting of a fault light.

[0060] Specifically, with reference to Figure 2 , the vehicle protection circuit 2 comprises an operational amplifier Q1 and a first transistor S1; wherein,

[0061] The first input end of the operational amplifier Q1 is connected with one end of the controlled circuit 3, and the second input end of the operational amplifier Q1 is connected with the other end of the controlled circuit 3;

[0062] The base of the first transistor S1 is connected with the output end of the operational amplifier Q1, and the collector of the first transistor S1 is connected with the input end of the control circuit 1.

[0063] When the controlled circuit 3 is in an abnormal state, the operational amplifier Q1 is used to:

[0064] Collect the reverse electromotive force of the controlled circuit 3, and output an enable signal based on the reverse electromotive force, and the enable signal is used to control the control circuit to stop working.

[0065] With continued reference to Figure 2 , the vehicle protection circuit 2 further comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4;

[0066] The first resistor R1 is connected with the first input end of the operational amplifier Q1;

[0067] The second resistor R2 is connected with the second input end of the operational amplifier Q2;

[0068] a third resistor R3 is connected in series between the output of the operational amplifier and the second input;

[0069] a fourth resistor R4 is connected in series between the first resistor R1 and the ground.

[0070] The vehicle protection circuit 2 further comprises a fifth resistor R5 and a sixth resistor R6;

[0071] One end of the fifth resistor R5 is connected to the output of the operational amplifier Q1, and the other end of the fifth resistor R5 is connected to the base of the first transistor S1;

[0072] The sixth resistor R6 is connected in series between the other end of the fifth resistor R5 and the ground.

[0073] The first resistor R1 is used to convert the current of the first input A of Q1 into corresponding voltage, and the second resistor R2 is used to convert the current of the second input B of Q1 into corresponding voltage. The third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are mainly used to protect the operational amplifier Q1 and the first transistor S1.

[0074] The first transistor S1 can be used as a switch to control the control circuit 1. When the controlled circuit is normal, the first transistor S1 can ensure the normal operation of the control circuit 1; when the controlled circuit is abnormal, the first transistor S1 can ensure that the control circuit stops working in time.

[0075] Specifically, the vehicle protection circuit 2 uses the first input of the operational amplifier Q1 to collect the back electromotive force of the controlled circuit 3. If it is determined that the current of the first input is greater than the current of the second input, an enable signal is output; based on the enable signal, the first transistor S1 is turned on, the second transistor S2 is turned off, and the MOS transistor S3 is turned off, so that the control circuit 1 stops working.

[0076] It can be seen that the vehicle protection circuit 2 of the embodiment has simple structure, and can greatly reduce the cost of the vehicle on the basis of ensuring safety.

[0077] Continuing to refer to Figure 2 , the control circuit 1 comprises a signal input circuit 21, a signal output circuit 22 and a signal sampling circuit 23;

[0078] The signal input circuit 21 is connected to the controlled circuit 3, and is used to receive the input signal sent by the control chip 4;

[0079] The first output of the signal output circuit 22 is connected to one end of the controlled circuit 3, and is used to output the control signal to the controlled circuit based on the input signal;

[0080] The signal sampling circuit 23 is connected with the second output end of the signal output circuit 22, used for collecting the working signal and sending the working signal to the control chip 4, so that the control chip judges whether the controlled circuit 3 is normal according to the input signal and the working signal.

[0081] Specifically, continuing to refer to Figure 2 , the input end of the signal output circuit 22 is C, and the output end is D, and the signal input circuit 21 comprises: a seventh resistor R7, a second transistor S2, an eighth resistor R8, and a ninth resistor R9; wherein,

[0082] One end of the seventh resistor R7 is connected with the control chip 4;

[0083] The base of the second transistor S2 is connected with the other end of the seventh resistor R7, and the emitter of the second transistor S2 is grounded;

[0084] One end of the eighth resistor R8 is connected with the base of the second transistor S2;

[0085] One end of the ninth resistor R9 is connected with the collector of the second transistor S2.

[0086] The signal output circuit 22 comprises: a MOS tube and a first diode D1;

[0087] The gate of the MOS tube S3 is connected with the other end of the ninth resistor R9, the source of the MOS tube S2 is connected with the power supply circuit, and the drain of the MOS tube S3 is connected with one end of the controlled circuit 3;

[0088] The first diode D1 is arranged between the drain of the MOS tube S2 and the controlled circuit 3. The first diode D1 has an anti-reverse effect, mainly used for preventing the reverse electromotive force generated by the controlled circuit 3 from damaging the power supply circuit.

[0089] Among them, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 have a voltage dividing effect, used for protecting the second transistor S2 and the MOS tube S3, and the MOS tube S3 is a PMOS tube in the embodiment.

[0090] The control circuit 1 further comprises:

[0091] A second diode D2, one end of the second diode D2 is connected with the first input end A of the operational amplifier Q1, and the other end of the second diode D2 is connected with the controlled circuit 3.

[0092] As Figure 2 shown, the signal output circuit 22 outputs the control signal to the controlled circuit 3, and the controlled circuit 3 starts to work. In the working process, the signal sampling circuit 23 samples the working signal generated in the working process and sends the working signal to the control chip 4. The sampling point of the signal sampling circuit 23 is Figure 2E point in the figure; the signal sampling circuit 23 comprises a tenth resistor R10, an eleventh resistor R11 and a first capacitor C1.

[0093] The tenth resistor R10 and the eleventh resistor R11 are connected in series between the second end of the signal output circuit 22 and the other end of the seventh resistor R7.

[0094] The first capacitor C1 is connected in parallel with the eleventh resistor R11. The first capacitor C1 has a filtering effect.

[0095] With reference to the foregoing Figure 2 , the system further comprises a second capacitor C2, which is arranged between the negative terminal (BATTERY-) of the controlled circuit 3 and the output end D of the signal output circuit 22. The second capacitor C2 has a filtering effect.

[0096] Further, with reference to the foregoing Figure 2 , the system further comprises a power supply circuit 24; the power supply circuit 24 comprises:

[0097] a twelfth resistor R12, a third capacitor C3 and a third diode D3;

[0098] The twelfth resistor R12, the second capacitor C3 and the third diode D3 are connected in parallel between the other end of the ninth resistor R9 and the MOS tube S3.

[0099] The third diode D3 is a voltage stabilizing diode, which has the effect of stabilizing the voltage of the power supply circuit 24.

[0100] The method for detecting whether the controlled circuit 3 is abnormal in the embodiment is as follows:

[0101] If it is determined that the input signal is at a high level and it is determined that the working signal is at a low level, it is determined that the controlled circuit 3 is abnormal;

[0102] If it is determined that the input signal is at a high level and it is determined that the working signal is at a high level, it is determined that the controlled circuit 3 is normal; or,

[0103] If it is determined that the input signal is at a low level and it is determined that the working signal is at a low level, it is determined that the controlled circuit 3 is normal.

[0104] In an embodiment, with reference to the foregoing Figure 3 , when the controlled component in the controlled circuit 3 is a relay K, the detection process is as follows:

[0105] When the input signal is at a high level, the second triode S2 is turned on; the gate level of the MOS tube S3 is pulled low, S3 is turned on; the output signal is at a high level, the relay K is energized and attracted, and the controlled circuit 3 starts to work. At this time, when the sampling point is at a high level, the control chip 4 determines that the controlled circuit 3 is working normally, the relay K is closed, and the controlled circuit 3 starts to work.

[0106] When the input signal is low, the second transistor S2 is off; the gate of the MOS transistor S3 is high, S3 is on; the output signal is low, the relay K is off, and the controlled circuit 3 stops working.

[0107] If it is determined that the input signal is high and the working signal is low, it is determined that the relay K is abnormally off or the control circuit 1 is abnormal.

[0108] When the relay is abnormally off, the relay generates a reverse electromotive force, which passes through the second diode D2. At this time, the current at the first input end of Q1 is much larger than that at the second input end, the positive input voltage of the operational amplifier Q1 is larger than the negative input voltage, the output of Q1 is +5V, the first transistor S1 is on, the voltage at the gate F of the first transistor S1 is pulled low, S1 is off, the MOS transistor S3 is off, and the output signal and the working signal are both low. At this time, the control circuit 1 stops working, and thus the control circuit and the controlled circuit can be effectively protected.

[0109] In addition, the control chip 4 sends the fault signal to the fault processing circuit 5, and the fault processing circuit 5 gives a corresponding fault processing mode based on the fault signal, such as lighting a prompt lamp or stopping the machine, etc.

[0110] Of course, the controlled component in the embodiment can also be replaced by other components according to actual needs, such as a water pump, etc., which is not limited herein.

[0111] Based on the same inventive concept as the foregoing embodiment, the embodiment further provides a vehicle protection circuit, and the specific structure and execution principle of the vehicle protection circuit can be referred to the foregoing description, which is not repeated here.

[0112] Based on the same inventive concept as the foregoing embodiment, the embodiment further provides a vehicle, which comprises the vehicle protection system mentioned above, and the specific structure and execution principle of the vehicle protection system can be referred to the foregoing description, which is not repeated here.

[0113] Through one or more embodiments of the present application, the present application has the following beneficial effects or advantages:

[0114] The application provides a vehicle protection circuit, a system and a vehicle, the vehicle protection circuit comprising: an operational amplifier, a first input end of the operational amplifier being connected with one end of a controlled circuit, a second input end of the operational amplifier being connected with the other end of the controlled circuit; a first triode, a base of the first triode being connected with an output end of the operational amplifier, a collector of the first triode being connected with an input end of a control circuit; wherein; when the controlled circuit is in an abnormal state, the first input end of the operational amplifier is used for collecting a reverse electromotive force of the controlled circuit, and an enable signal is output based on the reverse electromotive force, and the enable signal is used for controlling the control circuit to stop working; in this way, when the controlled circuit is abnormal, the vehicle protection circuit can timely interfere with the control circuit, so that the control circuit stops working in time, the control circuit is prevented from outputting the enable signal when the controlled circuit is abnormal, and the safety of the vehicle is ensured; and it can be seen that the vehicle protection circuit is simple in structure, and can greatly reduce the cost of the vehicle on the basis of ensuring safety.

[0115] The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general purpose systems can be used with programs in accordance with the teachings herein, or it can prove convenient to construct more specialized apparatus to perform the required method steps. The required structure for a variety of these systems will be apparent from the description above. In addition, the present application is not intended to be limited to any particular programming language. It will be appreciated that there are many programming languages that can be used to implement the teachings of the application herein, and any such programming language can be used in this connection. The descriptions above are intended to cover any and all methods of implementing the application, and the application should not be construed as limited to the examples described herein, but rather can include any number of variations commensurate with the description and spirit of the present application.

[0116] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0117] Similarly, it is to be understood that the embodiments of the application can be readily combined with one another, and the various features of the embodiments of the application can be interchanged among the embodiments of the application, without necessarily detaching the essential characteristics of the application. Thus, referring to the drawings, the specific embodiments of the application will hereinafter be described with the drawings.

[0118] Those skilled in the art will appreciate that the modules in the apparatuses in the embodiments can be adapted and placed in one or more apparatuses other than the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and further can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, all combinations of all features disclosed in this specification (including accompanying claims, abstract and drawings) and all processes or units of any methods or apparatuses so disclosed are enabled regardless of whether the same, equivalent or similar features are used. Each feature disclosed in this specification (including the accompanying claims, abstract and drawings) can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

[0119] Further, those skilled in the art will appreciate that a combination of features of different embodiments means that such combination is within the scope of the application and forms a different embodiment. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0120] The various component embodiments of the application can be implemented in hardware, or as software modules running in one or more processors, or in combinations thereof. Those skilled in the art will appreciate that a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of the functions of some or all of the components in the gateway, the proxy server, the system according to the embodiments of the application. The application can also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for performing part or all of the methods described herein. Such program implementing the application can be stored on a computer readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier signal, or in any other form.

[0121] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or sub-claims can be joined by means of the word 'or'. The word 'first','second', 'third', etc. do not imply any order. The terms 'comprise', 'comprising', 'include', 'including', and 'includes' are used herein to indicate the presence of stated features, integers, steps, or components but not to the exclusion of others.

[0122] Although preferred embodiments of the application have been described herein, additional alternatives, modifications, and variations can be apparent to those skilled in the art once given the benefit of the foregoing description. Accordingly, the scope of the application includes all such alternatives, modifications, and variations as can reasonably be included within the spirit and scope of the application as set out in the following claims.

[0123] The above description is intended to be illustrative and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead with reference to the appended claims, along with their full scope of equivalents.

Claims

1. A vehicle protection circuit, characterized by, The vehicle protection circuit comprises: an operational amplifier, a first input end of the operational amplifier being connected with one end of a controlled circuit, a second input end of the operational amplifier being connected with the other end of the controlled circuit; a first triode, a base of the first triode being connected with an output end of the operational amplifier, a collector of the first triode being connected with an input end of a control circuit; wherein when the controlled circuit is in an abnormal state, the operational amplifier is used for: collecting a reverse electromotive force of the controlled circuit, and outputting an enable signal based on the reverse electromotive force, the enable signal being used for controlling the control circuit to stop working; wherein the first input end of the operational amplifier collects the reverse electromotive force of the controlled circuit, and outputs the enable signal when it is determined that a current of the first input end is greater than a current of the second input end; the control circuit is stopped working based on the enable signal for controlling the first triode to be turned on, the second triode to be turned off and the MOS tube to be turned off.

2. The vehicle protection circuit of claim 1, wherein, The vehicle protection circuit further comprises: a first resistor, the first resistor being connected with the first input end of the operational amplifier; a second resistor, the second resistor being connected with the second input end of the operational amplifier; a third resistor, the third resistor being connected in series between the output end of the operational amplifier and the second input end; a fourth resistor, the fourth resistor being connected in series between the first resistor and the ground.

3. The vehicle protection circuit of claim 1, wherein, The vehicle protection circuit further comprises: a fifth resistor, one end of the fifth resistor being connected with the output end of the operational amplifier, the other end of the fifth resistor being connected with the base of the first triode; a sixth resistor, the sixth resistor being connected in series between the other end of the fifth resistor and the ground.

4. A vehicle protection system characterized by, The system comprises the vehicle protection circuit, the control circuit and the controlled circuit according to any one of claims 1 to 3; wherein the control circuit is used for receiving an input signal sent by a control chip, and outputting a control signal to the controlled circuit based on the input signal; the vehicle protection circuit is used for collecting a reverse electromotive force of the controlled circuit when the controlled circuit is in an abnormal state, and outputting an enable signal based on the reverse electromotive force, the enable signal being used for controlling the control circuit to stop working; wherein the vehicle protection circuit is specifically used for: collecting the reverse electromotive force of the controlled circuit by the first input end of the operational amplifier, and outputting the enable signal when it is determined that a current of the first input end is greater than a current of the second input end; the control circuit is stopped working based on the enable signal for controlling the first triode to be turned on, the second triode to be turned off and the MOS tube to be turned off.

5. The system of claim 4, wherein, The control circuit comprises: a signal input circuit, the signal input circuit being connected with the controlled circuit, and being used for receiving an input signal sent by a control chip; a signal output circuit, a first output end of the signal output circuit being connected with one end of the controlled circuit, and being used for outputting a control signal to the controlled circuit based on the input signal; A signal sampling circuit is connected with the second output end of the signal output circuit, used for collecting a working signal and sending the working signal to the control chip, so that the control chip judges whether the controlled circuit is normal according to the input signal and the working signal.

6. The system of claim 5, wherein, The signal input circuit comprises: A seventh resistor, one end of which is connected with the control chip; A second transistor, the base of which is connected with the other end of the seventh resistor, and the emitter of which is grounded; An eighth resistor, one end of which is connected with the base of the second transistor; A ninth resistor, one end of which is connected with the collector of the second transistor.

7. The system of claim 5, wherein, The signal output circuit comprises: A MOS transistor, the gate of which is connected with the other end of the ninth resistor, the source of which is connected with the power supply circuit, and the drain of which is connected with one end of the controlled circuit; A first diode, which is arranged between the drain of the MOS transistor and the controlled circuit.

8. The system of claim 5, wherein, The signal sampling circuit comprises a tenth resistor, an eleventh resistor and a first capacitor; The tenth resistor and the eleventh resistor are connected in series between the second end of the signal output circuit and the other end of the seventh resistor; The first capacitor is connected in parallel with the eleventh resistor.

9. A vehicle characterized by comprising: The vehicle comprises the vehicle protection system according to any one of claims 4 to 8.

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