Detection circuit and system of digital signal input end and vehicle

Abstract

The utility model relates to a detection circuit and system of a digital signal input end and a vehicle. The detection circuit comprises a voltage dividing module and a detection module. The voltage dividing module comprises a first voltage dividing branch and a second voltage dividing branch; the signal generation module is electrically connected with the input end of the first voltage division branch, the output end of the first voltage division branch is electrically connected with the detection module, the power supply module is electrically connected with the input end of the second voltage division branch, and the output end of the second voltage division branch is electrically connected with the detection module; and the voltage division module is used for dividing the voltage provided by the signal generation module by adopting a first voltage division branch and dividing the voltage provided by the power supply module by adopting a second voltage division branch according to the state of the digital signal output by the signal generation module. And the digital signal input by the signal generation module is determined according to the detection result, so that the state of the digital signal input end can be detected only through one circuit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of detection circuits, and particularly to a detection circuit, a system and a vehicle for a digital signal input terminal. Background Art

[0002] In the vehicle controller of an automobile, the application technology of the input interface circuit of digital signals not only involves the acquisition of driver operation signals and the processing of automobile motion sensor signals, but also includes the relevant optimization and processing in multiple key fields such as the energy management and fault diagnosis of the automobile. Therefore, the accurate detection of the state of the digital signal input terminal can enable the vehicle controller of the automobile to operate in an accurate and efficient manner, thereby improving the overall performance and safety of the vehicle. However, in the prior art, only a detection circuit can be used to detect the high-level signal or low-level signal input to the digital signal input terminal, and it is impossible to use a circuit to detect the open-circuit state of the digital signal input terminal and the high-level signal and low-level signal input to the digital signal input terminal. Summary of the Utility Model

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a detection circuit, a system and a vehicle for a digital signal input terminal.

[0004] The present disclosure provides a detection circuit for a digital signal input terminal, including: a voltage division module and a detection module; the voltage division module includes a first voltage division branch and a second voltage division branch; a signal generation module is electrically connected to the input end of the first voltage division branch, the output end of the first voltage division branch is electrically connected to the detection module, a power supply module is electrically connected to the input end of the second voltage division branch, the output end of the second voltage division branch is electrically connected to the detection module, and the first end of the first voltage division branch and the first end of the second voltage division branch are both grounded; wherein, the voltage division module is used for dividing the voltage provided by the signal generation module by using the first voltage division branch according to the digital signal output by the signal generation module, and dividing the voltage provided by the power supply module by using the second voltage division branch; the detection module is used for detecting the divided voltage value, determining that the signal generation module outputs a high-level state signal according to the voltage value satisfying a first voltage threshold; determining that the signal generation module outputs a low-level state signal according to the voltage value satisfying a second voltage threshold; and determining that the signal generation module outputs an open-circuit state signal according to the voltage value satisfying a third voltage threshold.

[0005] Optionally, the voltage dividing module further includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor; the second end of the first voltage dividing resistor is electrically connected to the first end of the second voltage dividing resistor at a first node, the second end of the second voltage dividing resistor is electrically connected to the first end of the third voltage dividing resistor at a second node, the signal generating module is electrically connected to the first node, the power supply module is electrically connected to the first end of the first voltage dividing resistor, the second node is electrically connected to the detection module, and the second end of the third voltage dividing resistor is grounded; wherein, the second voltage dividing resistor and the third voltage dividing resistor are connected in series to form a first voltage dividing branch, and the first voltage dividing resistor, the second voltage dividing resistor, and the third voltage dividing resistor are connected in series to form a second voltage dividing branch.

[0006] Optionally, a filtering module is further included; the input end of the filtering module is electrically connected to the signal generating module, the output end of the filtering module is electrically connected to the input end of the first voltage dividing branch, and the first end of the filtering module is grounded.

[0007] Optionally, the filtering module includes a first inductor and a first capacitor; the signal generating module is electrically connected to the input end of the first voltage dividing branch through the first inductor, the first end of the first capacitor is electrically connected to the input end of the first voltage dividing branch, and the second end of the first capacitor is grounded.

[0008] Optionally, a protection module is further included; the first end of the protection module is electrically connected to the output end of the first voltage dividing branch and the output end of the second voltage dividing branch, the second end of the protection module is electrically connected to the detection module, the third end of the protection module is electrically connected to the power supply module, and the fourth end of the protection module is grounded.

[0009] Optionally, the protection module includes a first diode; the positive terminal of the first diode is electrically connected to the first end of the protection module and the second end of the protection module, and the negative terminal of the first diode is electrically connected to the power supply module.

[0010] Optionally, the protection module further includes a second diode; the positive terminal of the second diode is grounded, and the negative terminal of the second diode is electrically connected to the positive terminal of the first diode.

[0011] Optionally, the protection module includes a current limiting resistor; the first end of the protection module is electrically connected to the second end of the protection module through the current limiting resistor.

[0012] The present disclosure further provides a detection system for a digital signal input end, including the detection circuit for the digital signal input end as described above arbitrarily.

[0013] The present disclosure further provides a vehicle, including the detection system for the digital signal input end as described above.

[0014] The present disclosure provides a detection circuit, a system and a vehicle for a digital input signal. The detection circuit for the digital input signal provided by the present disclosure divides the voltage provided by a signal generation module or a power supply module through a voltage division module, and a detection module determines the digital signal output by the signal generation module by detecting the divided voltage value. When the signal generation module outputs a high-level signal, the voltage division module divides the voltage provided by the signal generation module using a first voltage division branch, and at this time, the detection module detects that the divided voltage value satisfies a first voltage threshold. When the pre-stage circuit of the voltage division module is in an open circuit state, the voltage division module receives an open circuit signal output by the signal generation module, and the voltage division module divides the voltage provided by the power supply module using a second voltage division branch, and at this time, the detection module detects that the divided voltage value satisfies a third voltage threshold. When the signal generation module outputs a low-level signal, the voltage division module does not divide the voltage, and the voltage value detected by the detection module satisfies a second voltage threshold, that is, the voltage value detected by the detection module is 0. The present disclosure divides the voltage provided by the signal generation module or the power supply module using different voltage division branches according to different signals provided by the signal generation module through the voltage division module, so that the divided voltage values output to the detection circuit are different. Therefore, the detection module can determine the signal input to the signal generation module by judging the input voltage value, thereby realizing the detection of whether the pre-stage circuit of the voltage division module is open circuit and the detection of the high-level signal and the low-level signal input from the digital signal input end to the voltage division module using only one circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0016] Figure 1 FIG. is a schematic structural diagram of a detection circuit for a digital signal input end provided by an embodiment of the present disclosure.

[0017] Figure 2 FIG. is a schematic structural diagram of another detection circuit for a digital signal input end provided by an embodiment of the present disclosure.

[0018] Figure 3 FIG. is a schematic structural diagram of a preferred detection circuit for a digital signal input end provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

[0021] Figure 1 The following is a schematic structural diagram of a detection circuit for a digital signal input end provided by an embodiment of the present disclosure, as Figure 1 shown, the detection circuit includes: a voltage division module 100 and a detection module 200. The voltage division module 100 includes a first voltage division branch 110 and a second voltage division branch 120. The signal generation module 300 is electrically connected to the input end 111 of the first voltage division branch 110, the output end 112 of the first voltage division branch 110 is electrically connected to the detection module 200, the power supply module 400 is electrically connected to the input end 121 of the second voltage division branch 120, the output end 122 of the second voltage division branch 120 is electrically connected to the detection module 200, and the first end 113 of the first voltage division branch 110 and the first end 123 of the second voltage division branch 120 are both grounded. Among them, the voltage division module 100 is configured to divide the voltage provided by the signal generation module 300 by using the first voltage division branch 110 according to the digital signal output by the signal generation module 300, and divide the voltage provided by the power supply module 400 by using the second voltage division branch 120. The detection module 200 is configured to detect the divided voltage value, and determine that the signal generation module 300 outputs a high-level state signal according to the voltage value satisfying the first voltage threshold. Determine that the signal generation module 300 outputs a low-level state signal according to the voltage value satisfying the second voltage threshold. Determine that the signal generation module 300 outputs an open-circuit state signal according to the voltage value satisfying the third voltage threshold.

[0022] Specifically, the voltage division module 100 switches the digital signal provided by the signal generation module 300 to different voltage division branches through the internal hardware circuit structure to divide the voltages provided by the signal generation module 300 and the power supply module 400. The detection module 200 detects the divided voltage value, compares the detected voltage value with the first voltage threshold, the second voltage threshold, and the third voltage threshold respectively, and determines the digital signal output by the signal generation module 300 according to the comparison result.

[0023] When the signal generation module 300 outputs a high-level signal, the signal generation module 300 powers the voltage division module 100. The voltage division module 100 divides the voltage provided by the signal generation module 300 using the first voltage division branch 110. At this time, the detection module 200 detects that the voltage value after voltage division satisfies the first voltage threshold. When the pre-circuit of the voltage division module 100 is in an open circuit state, since the input terminal 111 of the first voltage division branch 110 does not receive a high-level signal or a low-level signal from the signal generation module 300, it is regarded that the voltage division module 100 receives an open circuit state signal output by the signal generation module 300 at this time. The voltage division module 100 is powered by the power supply module 400, and the voltage division module 100 divides the voltage provided by the power supply module 400 using the second voltage division branch 120. At this time, the detection module 200 detects that the voltage value after voltage division satisfies the third voltage threshold. When the signal generation module 300 outputs a low-level signal, neither the signal generation module 300 nor the power supply module 400 powers the voltage division module 100. Therefore, the voltage division module 100 does not perform voltage division, and the voltage value detected by the detection module 200 satisfies the second voltage threshold, that is, the voltage value detected by the detection module 200 is 0.

[0024] Therefore, the present disclosure can detect the voltage output after voltage division by the voltage division module 100 through the detection module 200, and then realize the judgment of the signal output by the signal generation module 300. By the voltage division module 100 according to different signals provided by the signal generation module 300, different voltage division branches are used to divide the voltage provided by the signal generation module 300 or the power supply module 400, so that the voltage value after voltage division output to the detection module 200 is different. Therefore, the detection module 200 can judge the input signal by judging the input voltage value, thereby realizing the detection of whether the pre-circuit of the detection circuit is open and the detection of the high-level signal and the low-level signal input from the digital signal input terminal of the signal generation module 300 to the voltage division module 100 only through one circuit.

[0025] In some embodiments, Figure 2 is a schematic structural diagram of another detection circuit for the digital signal input terminal provided by the embodiment of the present disclosure, as Figure 2As shown, the voltage division module further includes a first voltage division resistor R1, a second voltage division resistor R2, and a third voltage division resistor R3. The second end of the first voltage division resistor R1 is electrically connected to the first end of the second voltage division resistor R2 at a first node A. The second end of the second voltage division resistor R2 is electrically connected to the first end of the third voltage division resistor R3 at a second node B. The signal generation module 300 is electrically connected to the first node A. The power supply module 400 is electrically connected to the first end of the first voltage division resistor R1. The second node B is electrically connected to the detection module 200. The second end of the third voltage division resistor R3 is grounded. Among them, the second voltage division resistor R2 and the third voltage division resistor R3 are connected in series to form a first voltage division branch. The first voltage division resistor R1, the second voltage division resistor R2, and the third voltage division resistor R3 are connected in series to form a second voltage division branch.

[0026] Exemplarily, taking the resistance value of the first voltage division resistor R1 as R1 = 51 KΩ, the resistance value of the second voltage division resistor R2 as R2 = 22 KΩ, the resistance value of the third voltage division resistor R3 as R3 = 3.3 KΩ, the voltage U1 provided by the signal generation module 300 as 24 V, and the voltage U2 provided by the power supply module 400 as 24 V as an example.

[0027] When the signal generation module 300 provides a high-level signal, the voltage provided by the signal generation module 300 is 24 V. At this time, since the voltage provided by the power supply module 400 is also 24 V, there is no current flowing from the power supply module 400 towards the first node A. The voltage at the first node A is the 24 V voltage provided by the signal generation module 300. At this time, the voltage division circuit divides the 24 V voltage through the first voltage division branch formed by the second voltage division resistor R2 and the third voltage division resistor R3. The detection module 200 detects the divided voltage at the second node B. At this time, the voltage U at the second node B B is:

[0028]

[0029] Therefore, at this time, the voltage U at the second node B B can be used as the first voltage threshold, that is, the magnitude of the first voltage threshold is 3.13 V.

[0030] When the signal generation module 300 provides an open-circuit signal, at this time, only the power supply module 400 provides a voltage of 24 V. Therefore, there is current flowing from the power supply module 400 towards the first node A. At this time, the voltage division circuit divides the 24 V voltage provided by the power supply module 400 through the second voltage division branch formed by the first voltage division resistor R1, the second voltage division resistor R2, and the third voltage division resistor R3. The detection module 200 detects the divided voltage at the second node B. At this time, the voltage U at the second node B B is:

[0031]

[0032] Therefore, the voltage U at the second node B at this time B can be used as the third voltage threshold, that is, the magnitude of the third voltage threshold is 1.034V.

[0033] When the signal generation module 300 provides a low-level signal, neither the signal generation module 300 nor the power supply module 400 can provide a voltage at the first node A. Therefore, the voltage at the first node A is 0V. At this time, the voltage divider circuit does not divide the voltage, and the voltage U detected by the detection module 200 at the second node B B = 0. At this time, the voltage U at the second node B B can be used as the second voltage threshold, that is, the magnitude of the second voltage threshold is 0V.

[0034] Therefore, in the present disclosure, the detection module 200 detects the voltage output after the voltage division of the voltage division module, thereby realizing the judgment of the signal output by the signal generation module 300. When the voltage value detected by the detection module 200 satisfies the first voltage threshold, it can be determined that the digital signal output by the signal generation module 300 is a high-level signal. When the voltage value detected by the detection module 200 satisfies the second voltage threshold, it can be determined that the digital signal output by the signal generation module 300 is a low-level signal. When the voltage value detected by the detection module 200 satisfies the third voltage threshold, it can be determined that there is an open circuit in the pre-stage circuit of the detection circuit. Thus, the present disclosure uses fewer electronic components to realize the detection of whether there is an open circuit in the pre-stage circuit of the detection circuit and the detection of the high-level signal and the low-level signal input from the digital signal input terminal of the signal generation module 300 to the voltage division module 100 through only one circuit. The implementation cost of the detection circuit is low, saving the production cost.

[0035] It should be noted that the resistance value R1 of the first voltage division resistor R1 = 51KΩ, the resistance value R2 of the second voltage division resistor R2 = 22KΩ, the resistance value R3 of the third voltage division resistor R3 = 3.3KΩ, the voltage U1 provided by the signal generation module 300 = 24V, and the voltage U2 provided by the power supply module 400 = 24V are all examples. The specific resistance and voltage values are set according to the actual situation and are not specifically limited herein.

[0036] In some embodiments, the detection circuit further includes a filtering module. The input end of the filtering module is electrically connected to the signal generation module, the output end of the filtering module is electrically connected to the input end of the first voltage division branch, and the first end of the filtering module is grounded.

[0037] Specifically, the digital signal output by the signal generation module is output to the voltage division module after passing through the filtering module. The filtering module can block the passage of high-frequency signals in the digital signal, which helps to ensure the integrity of the required signal. At the same time, it can also reduce the high-frequency noise existing in the voltage output by the voltage division circuit and avoid the interference of high-frequency noise to the subsequent circuits of the detection circuit.

[0038] In some embodiments, the filtering module includes a first inductor and a first capacitor. The signal generation module is electrically connected to the input end of the first voltage division branch through the first inductor. The first end of the first capacitor is electrically connected to the input end of the first voltage division branch, and the second end of the first capacitor is grounded.

[0039] Specifically, the first inductor and the first capacitor together form an LC filtering circuit. After the digital signal output by the signal generation module passes through the LC filtering circuit, the LC filtering circuit filters the high-frequency noise signals in the digital signal, blocks the passage of high-frequency noise signals, and the LC filtering circuit can allow the passage of DC signals, which is beneficial to the integrity of the signal. At the same time, it can also reduce the high-frequency noise existing in the voltage output by the voltage division circuit and avoid the interference of high-frequency noise to the subsequent circuits of the detection circuit.

[0040] In some embodiments, the detection circuit further includes a protection module. The first end of the protection module is electrically connected to the output ends of the first voltage division branch and the second voltage division branch. The second end of the protection module is electrically connected to the detection module. The third end of the protection module is electrically connected to the power supply module, and the fourth end of the protection module is grounded.

[0041] Exemplarily, the protection module is electrically connected between the output ends of the first voltage division branch and the second voltage division branch and the detection circuit. The protection module is used for, for example, overcurrent protection in the circuit. Through the protection module, the magnitude of the current output from the output ends of the first voltage division branch and the second voltage division branch to the detection circuit can be limited, avoiding excessive current output to the detection circuit and thus causing damage to the detection circuit. The protection module can also be used for, for example, overvoltage protection in the circuit. Through the protection module, the magnitude of the voltage output from the output ends of the first voltage division branch and the second voltage division branch to the detection circuit can be limited, avoiding damage to the detection circuit due to receiving too high a voltage.

[0042] It should be noted that the protection module can also be other modules for circuit protection other than realizing overcurrent protection and overvoltage protection, and no specific limitation is made here.

[0043] In some embodiments, the protection module includes a first diode. The positive terminal of the first diode is electrically connected to the first end of the protection module and the second end of the protection module, and the negative terminal of the first diode is electrically connected to the power supply module.

[0044] Exemplarily, to avoid excessive voltage received by the detection module, which may cause damage to the detection module, a first diode for overvoltage protection is provided in the protection module. The first diode is used for voltage clamping. When the voltage values output after voltage division by the first voltage division branch and the second voltage division branch are much higher than the voltage that the detection module can withstand, the first diode can reduce the output voltage value to a voltage protection threshold. For example, the voltage drop parameter of the first diode is U D , the voltage provided by the power supply module is VCC. At this time, the voltages at the output ends of the first voltage division branch and the second voltage division branch will be clamped to VCC + U D . Therefore, as long as the maximum voltage that the detection module can withstand does not exceed VCC + U D , it will not cause the detection module to be damaged by excessive voltage breakdown.

[0045] In some embodiments, the protection module further includes a second diode. The positive terminal of the second diode is grounded, and the negative terminal of the second diode is electrically connected to the positive terminal of the first diode.

[0046] Exemplarily, the first diode and the second diode are jointly used for voltage clamping. Taking the voltage provided by the power supply module as VCC and the voltage drop parameters of both the first diode and the second diode as U D as an example, the negative terminal of the second diode is electrically connected to the positive terminal of the first diode at the third node. When the potential of the third node is greater than VCC + U D , at this time, the first diode will conduct and limit the potential of the third node to VCC + U D , and the second diode is cut off. When the potential of the third node is greater than -U D and less than VCC + U D , both the first diode and the second diode are cut off. When the potential of the third node is less than -U D , the first diode is cut off, the second diode conducts, and the potential at the third node is limited to -U D . Therefore, the potential range at the third node will be limited between -U D and VCC + U D , that is, the potential at the third node is greater than or equal to -U D and less than or equal to VCC + U D . Thus, the protection module realizes the limitation of the voltage output to the detection module through the first diode and the second diode, avoids being damaged by excessive voltage breakdown, and also realizes the negative voltage protection of the detection module.

[0047] In some embodiments, the protection module includes a current-limiting resistor. The first end of the protection module is electrically connected to the second end of the protection module through the current-limiting resistor.

[0048] Specifically, the current-limiting resistor is electrically connected between the detection module and the output ends of the first voltage-dividing branch and the second voltage-dividing branch. The current-limiting resistor can limit the magnitude of the current output to the detection module, preventing the current output to the detection module from being too large and causing damage to the detection module.

[0049] Figure 3 As shown in the schematic diagram of the structure of a preferred detection circuit for a digital signal input terminal provided by an embodiment of the present disclosure, Figure 3 as shown, the detection circuit includes: a first inductor L1, a first capacitor C1, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a current-limiting resistor R4, a first diode D1, a second diode D2, and a detection module 200.

[0050] The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are electrically connected to the first node A. The second voltage-dividing resistor R2 and the third voltage-dividing resistor R3 are electrically connected to the second node B. The signal generation module 300 is electrically connected to the first node A through the first inductor L1. The first node A is also grounded through the first capacitor C1. The power supply module 400 is electrically connected to the first node A through the first voltage-dividing resistor R1. The first end of the current-limiting resistor R4 is electrically connected to the second node B. The second end of the current-limiting resistor R4 is electrically connected to the detection module. The second end of the current-limiting resistor R4 is also electrically connected to the positive electrode end of the first diode D1 and the negative electrode end of the second diode D2. The negative electrode end of the first diode D1 is electrically connected to the power supply module 500. The positive electrode end of the second diode D2 is grounded.

[0051] Exemplarily, taking the resistance value of the first voltage-dividing resistor R1 as R1 = 51 KΩ, the resistance value of the second voltage-dividing resistor R2 as R2 = 22 KΩ, the resistance value of the third voltage-dividing resistor R3 as R3 = 3.3 KΩ, the voltage U1 provided by the signal generation module 300 as 24 V, and the voltage U2 provided by the power supply module 400 as 24 V as an example.

[0052] When the signal generation module 300 provides a high-level signal, the voltage provided by the signal generation module 300 is 24 V. At this time, since the voltage provided by the power supply module 400 is also 24 V, there is no current flowing in the direction from the power supply module 400 to the first node A. The voltage at the first node A is the 24 V voltage provided by the signal generation module 300. At this time, the voltage-dividing circuit divides the 24 V voltage through the first voltage-dividing branch composed of the second voltage-dividing resistor R2 and the third voltage-dividing resistor R3. The detection module 200 detects the divided voltage at the second node B. At this time, the voltage U at the second node B B is:

[0053]

[0054] Therefore, at this time, the voltage U at the second node B BIt can be used as the first voltage threshold, that is, the magnitude of the first voltage threshold is 3.13V.

[0055] When the signal generation module 300 provides an open circuit signal, at this time only the power supply module 400 provides a voltage of 24V. Therefore, there is a current flowing from the power supply module 400 towards the first node A. At this time, the voltage division circuit divides the 24V voltage provided by the power supply module 400 through the second voltage division branch composed of the first voltage division resistor R1, the second voltage division resistor R2, and the third voltage division resistor R3. The detection module 200 detects the voltage after voltage division at the second node B. At this time, the voltage U at the second node B B is:

[0056]

[0057] Therefore, at this time, the voltage U at the second node B B can be used as the third voltage threshold, that is, the magnitude of the third voltage threshold is 1.034V.

[0058] When the signal generation module 300 provides a low-level signal, neither the signal generation module 300 nor the power supply module 400 can provide a voltage at the first node A. Therefore, the voltage at the first node A is 0V. At this time, the voltage division circuit does not perform voltage division, and the voltage U detected by the detection module 200 at the second node B B = 0. At this time, the voltage U at the second node B B can be used as the second voltage threshold, that is, the magnitude of the second voltage threshold is 0V.

[0059] The digital signal provided by the signal generation module 300 is output to the first node A after passing through the LC filtering module composed of the first inductor L1 and the first capacitor C1. The LC filtering circuit filters the high-frequency noise signals in the digital signal, prevents the high-frequency noise signals from passing through, and the LC filtering circuit can allow the DC signal to pass through, which is beneficial to the signal integrity. At the same time, it can also reduce the high-frequency noise existing in the voltage output to the detection module 200 and avoid interference caused by the high-frequency noise to the subsequent circuits of the detection circuit.

[0060] The first diode D1 and the second diode D2 are jointly used for voltage clamping. Taking the voltage provided by the power supply module 500 as VCC and the voltage drop parameters of the first diode D1 and the second diode D2 as U D as an example, the negative terminal of the second diode D2 is electrically connected to the positive terminal of the first diode D1 at the third node C. When the potential of the third node is greater than VCC + U D , at this time the first diode D1 will conduct and limit the potential of the third node C to VCC + U D , and the second diode D2 is cut off. When the potential of the third node C is greater than -U D, less than VCC + U D When the potential of the third node C is less than -U D , the first diode D1 and the second diode D2 are both cut off. When the potential of the third node C is less than -U D , the first diode D1 is cut off and the second diode D2 is turned on, and the potential at the third node C is limited to -U D . Therefore, the potential range at the third node C will be limited to -U D and VCC + U D , that is, the potential at the third node C is greater than or equal to -U D , less than or equal to VCC + U

[0061] Therefore, the present disclosure detects the voltage output after voltage division by the first voltage dividing resistor R1, the second voltage dividing resistor R2, and the third voltage dividing resistor R3 through the detection module 200, and then realizes the judgment of the signal output by the signal generation module 300. When the voltage value detected by the detection module 200 satisfies the first voltage threshold, it can be determined that the digital signal output by the signal generation module 300 is a high-level signal. When the voltage value detected by the detection module 200 satisfies the second voltage threshold, it can be determined that the digital signal output by the signal generation module 300 is a low-level signal. When the voltage value detected by the detection module 200 satisfies the third voltage threshold, it can be determined that there is an open circuit in the pre-stage circuit of the detection circuit. Thus, the present disclosure uses fewer electronic components to realize the detection of whether there is an open circuit in the pre-stage circuit of the detection circuit and the detection of the high-level signal and the low-level signal input from the digital signal input terminal of the signal generation module 300 to the voltage division module 100 through only one circuit, and the implementation cost of the detection circuit is low, saving the production cost.

[0062] The present disclosure also provides a detection system for a digital signal input terminal, including the detection circuit for the digital signal input terminal as described above.

[0063] It can be understood that the detection system for the digital signal input terminal provided by the embodiments of the present disclosure can achieve the corresponding beneficial effects of any one of the detection circuits for the digital signal input terminal provided by the above embodiments, which will not be elaborated here.

[0064] The present disclosure also provides a vehicle, including the detection system for the digital signal input terminal as described above.

[0065] It can be understood that the vehicle provided by the embodiments of the present disclosure can achieve the corresponding beneficial effects of the detection system for the digital signal input terminal provided by the above embodiments, which will not be elaborated here.

[0066] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0067] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection circuit for a digital signal input terminal, characterized in that, Including: A voltage division module and a detection module; the voltage division module includes a first voltage division branch and a second voltage division branch; The signal generation module is electrically connected to the input end of the first voltage division branch, the output end of the first voltage division branch is electrically connected to the detection module, the power supply module is electrically connected to the input end of the second voltage division branch, the output end of the second voltage division branch is electrically connected to the detection module, the first end of the first voltage division branch and the first end of the second voltage division branch are both grounded; Wherein, the voltage division module is used to divide the voltage provided by the signal generation module by using the first voltage division branch according to the digital signal output by the signal generation module, and divide the voltage provided by the power supply module by using the second voltage division branch; the detection module is used to detect the divided voltage value, determine that the signal generation module outputs a high-level state signal according to the voltage value satisfying the first voltage threshold; determine that the signal generation module outputs a low-level state signal according to the voltage value satisfying the second voltage threshold; determine that the signal generation module outputs an open-circuit state signal according to the voltage value satisfying the third voltage threshold.

2. The detection circuit according to claim 1, wherein The voltage division module further includes a first voltage division resistor, a second voltage division resistor and a third voltage division resistor; The second end of the first voltage division resistor is electrically connected to the first end of the second voltage division resistor at a first node, the second end of the second voltage division resistor is electrically connected to the first end of the third voltage division resistor at a second node, the signal generation module is electrically connected to the first node, the power supply module is electrically connected to the first end of the first voltage division resistor, the second node is electrically connected to the detection module, and the second end of the third voltage division resistor is grounded; Wherein, the second voltage division resistor and the third voltage division resistor are connected in series to form a first voltage division branch, and the first voltage division resistor, the second voltage division resistor and the third voltage division resistor are connected in series to form a second voltage division branch.

3. The detection circuit according to claim 1, wherein It further includes a filtering module; the input end of the filtering module is electrically connected to the signal generation module, the output end of the filtering module is electrically connected to the input end of the first voltage division branch, and the first end of the filtering module is grounded.

4. The detection circuit according to claim 3, wherein The filtering module includes a first inductor and a first capacitor; The signal generation module is electrically connected to the input end of the first voltage division branch through the first inductor, the first end of the first capacitor is electrically connected to the input end of the first voltage division branch, and the second end of the first capacitor is grounded.

5. The detection circuit according to claim 1, wherein It further includes a protection module; the first end of the protection module is electrically connected to the output end of the first voltage division branch and the output end of the second voltage division branch, the second end of the protection module is electrically connected to the detection module, the third end of the protection module is electrically connected to the power supply module, and the fourth end of the protection module is grounded.

6. The detection circuit according to claim 5, wherein The protection module includes a first diode; the positive electrode end of the first diode is electrically connected to the first end of the protection module and the second end of the protection module, and the negative electrode end of the first diode is electrically connected to the power supply module.

7. The detection circuit according to claim 6, wherein The protection module further includes a second diode; the positive terminal of the second diode is grounded, and the negative terminal of the second diode is electrically connected to the positive terminal of the first diode.

8. The detection circuit according to claim 5, characterized in that, The protection module includes a current-limiting resistor; the first end of the protection module is electrically connected to the second end of the protection module through the current-limiting resistor.

9. A detection system for a digital signal input end, characterized in that, A detection circuit including a digital signal input terminal according to any one of claims 1-8.

10. A vehicle, characterized in that, A detection system including a digital signal input terminal according to claim 9.

Images