Collision signal detection circuit and collision signal detection apparatus

Abstract

A collision signal detection circuit and a collision signal detection apparatus. The collision signal detection circuit comprises an anti-reverse connection module (100), a current-limiting driving module (200), an isolation driving module (300) and a signal output module (400), wherein the anti-reverse connection module (100) is connected to a circuit to be subjected to detection, so as to detect a collision signal in the circuit to be subjected to detection, an output end of the anti-reverse connection module (100) is connected to an input side of the isolation driving module (300) by means of the current-limiting driving module (200), and an output side of the isolation driving module (300) is connected to the signal output module (400). The collision signal detection apparatus comprises the collision signal detection circuit. The anti-reverse connection module (100) is provided, such that regardless of whether the circuit to be subjected to detection is normally connected or reversely connected to the anti-reverse connection module (100), the circuit to be subjected to detection can be normally rectified by means of the anti-reverse connection module (100), thereby preventing detection abnormalities caused by reverse connection. Moreover, the isolation driving module (300) is provided, such that signal input and signal output are isolated, thereby improving the stability of collision signal detection.

Description

Collision signal detection circuit and collision signal detection device

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202422116378.X, filed on August 29, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of circuit technology, and in particular to a collision signal detection circuit and a collision signal detection device. Background Technology

[0004] In the existing field of collision signal detection technology, the signal output sensor and the signal detection circuit are far apart, and the electromagnetic environment on the vehicle is complex, so the anti-interference ability of the existing technology is limited; and when the detection circuit is reversed, the collision signal detection function fails, and the stability of collision signal detection is low.

[0005] Application content

[0006] The main purpose of this application is to propose a collision signal detection circuit and a collision signal detection device, which aims to solve the problem of low stability of collision signal detection in the prior art.

[0007] To achieve the above objectives, this application provides a collision signal detection circuit. The collision detection circuit is used to connect to a circuit under test. The collision detection circuit includes a reverse connection protection module, a current limiting drive module, an isolation drive module, and a signal output module. The reverse connection protection module is used to connect to the circuit under test to detect collision signals in the circuit under test. The output terminal of the reverse connection protection module is connected to the input side of the isolation drive module through the current limiting drive module, and the output side of the isolation drive module is connected to the signal output module.

[0008] Optionally, the reverse connection protection module includes a first input terminal and a second input terminal, which are used to connect to the circuit under test. The collision signal detection circuit further includes a first resistor, wherein:

[0009] The first end of the first resistor is connected to the first input end of the reverse connection protection module;

[0010] The negative input terminal of the circuit under test is connected to the second terminal of the first resistor and the second input terminal of the reverse connection protection module.

[0011] Optionally, it further includes an electrostatic discharge (ESD) protection circuit disposed between the reverse connection protection module and the circuit under test, the ESD protection circuit including a first capacitor, a second capacitor, a third capacitor, a first bidirectional Zener diode, and a second bidirectional Zener diode; wherein:

[0012] The first terminal of the first capacitor is connected to the positive input terminal of the circuit under test, the first terminal of the second capacitor is connected to the negative input terminal of the circuit under test, the second terminal of the first capacitor is connected to the second terminal of the second capacitor, the first bidirectional Zener diode is connected in parallel with the first capacitor, the second bidirectional Zener diode is connected in parallel with the second capacitor, the second terminal of the first capacitor is also connected to the floating ground, and the third capacitor is connected between the floating ground and the earth ground.

[0013] Optionally, the reverse connection protection module includes a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a third diode, and a fourth diode; wherein:

[0014] The gate of the first MOSFET is connected to the first input terminal of the reverse connection protection module through the second resistor. The gate of the first MOSFET is also connected to the anode of the first diode. The cathode of the first diode is connected to the anode input terminal of the current limiting drive module. The source of the first MOSFET is connected to the anode input terminal of the current limiting drive module. The drain of the first MOSFET is connected to the second input terminal of the reverse connection protection module.

[0015] The gate of the second MOSFET is connected to the second input terminal of the reverse connection protection module through the third resistor. The gate of the second MOSFET is also connected to the anode of the second diode. The cathode of the second diode is connected to the anode input terminal of the current limiting drive module. The source of the second MOSFET is connected to the anode input terminal of the current limiting drive module. The drain of the second MOSFET is connected to the first input terminal of the reverse connection protection module.

[0016] The gate of the third MOS transistor is connected to the first input terminal of the reverse connection protection module through the fourth resistor. The gate of the third MOS transistor is also connected to the negative terminal of the third diode. The positive terminal of the third diode is connected to the negative input terminal of the current limiting drive module. The negative input terminal of the current limiting drive module is grounded. The drain of the third MOS transistor is grounded. The source of the third MOS transistor is connected to the second input terminal of the reverse connection protection module.

[0017] The gate of the fourth MOS transistor is connected to the second input terminal of the reverse connection protection module through the fifth resistor. The gate of the fourth MOS transistor is also connected to the negative terminal of the fourth diode. The positive terminal of the fourth diode is grounded, the drain of the fourth MOS transistor is grounded, and the source of the fourth MOS transistor is connected to the second input terminal of the reverse connection protection module.

[0018] Optionally, the current-limiting drive module includes a first transistor, a second transistor, a third transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth capacitor; wherein:

[0019] The base of the first transistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the positive terminal of the reverse connection protection module, the second end of the sixth resistor is also grounded through the seventh resistor, and the base of the first transistor is also grounded through the eighth resistor and the fourth capacitor respectively; the emitter of the first transistor is grounded, and the collector of the first transistor is connected to the collector of the second transistor and the base of the third transistor through the ninth resistor;

[0020] The emitter of the second transistor is connected to the positive terminal of the reverse connection protection module. The emitter of the second transistor is also connected to the base of the second transistor through the tenth resistor. The base of the second transistor is connected to the base of the third transistor through the eleventh resistor. The base of the second transistor is also connected to the emitter of the third transistor. The collector of the third transistor is grounded through the twelfth resistor. The collector of the third transistor is also connected to the input side of the isolation drive module.

[0021] Optionally, the isolation drive module includes an optocoupler; wherein:

[0022] The positive terminal of the optocoupler is connected to the current-limiting drive module, the negative terminal of the optocoupler is grounded, the collector of the optocoupler is connected to the input terminal of the signal output module, and the emitter of the optocoupler is grounded.

[0023] Optionally, the signal output module includes a trigger time configuration unit, a signal latch unit, and a power supply holding unit; the input terminal of the trigger time configuration unit is connected to the output side of the isolation drive module, the output terminal of the trigger time configuration unit is connected to the signal latch unit, and the power supply terminals of the trigger time configuration unit and the signal latch unit are connected to the power supply holding unit.

[0024] Optionally, the trigger time configuration unit includes a fourth transistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, and a comparator; wherein:

[0025] The base of the fourth transistor is connected to the output side of the isolation drive module through the thirteenth resistor. The base of the fourth transistor is also connected to the power supply holding unit through the fourteenth resistor. The emitter of the fourth transistor is connected to the power supply holding unit. The collector of the fourth transistor is grounded through the fifteenth resistor. The collector of the fourth transistor is also connected to the input terminal of the comparator through the sixteenth resistor. The input terminal of the comparator is also grounded through the fifth capacitor. The power supply terminal of the comparator is connected to the power supply holding unit. The output terminal of the comparator is connected to the signal latching unit.

[0026] Optionally, the power supply holding unit includes an anti-reverse filter unit, a voltage regulator, and a sixth capacitor; wherein:

[0027] The input terminal of the anti-reverse filtering module is connected to the power supply, the output terminal of the anti-reverse filtering module is grounded through the sixth capacitor, the output terminal of the anti-reverse filtering module is connected to the input terminal of the voltage regulator, the first output terminal of the voltage regulator is connected to the power supply terminal of the trigger time configuration unit, and the second output terminal of the voltage regulator is connected to the power supply terminal of the signal latch unit.

[0028] Optionally, the first capacitor and the second capacitor are used to filter the collision signal; the first bidirectional Zener diode and the second bidirectional Zener diode are used for voltage regulation.

[0029] Optionally, when the circuit under test is connected to the reverse connection protection module in the correct direction, the first input terminal of the reverse connection protection module is connected to the positive input terminal of the circuit under test, and the second input terminal of the reverse connection protection module is connected to the negative input terminal of the circuit under test.

[0030] Optionally, the first and second MOSFETs are PMOS, and the third and fourth MOSFETs are NMOS.

[0031] Optionally, the first transistor is NPN type, and the second and third transistors are PNP type.

[0032] Optionally, the fourteenth resistor is the pull-up resistor of the fourth transistor; the fourth transistor is a PNP transistor.

[0033] In addition, to achieve the above objectives, this application also provides a collision signal detection device, which includes a housing and a collision signal detection circuit as described above, wherein the collision signal detection circuit is disposed within the housing.

[0034] This application discloses a collision signal detection circuit and a collision signal detection device. The collision signal detection circuit is connected to a collision sensor and includes a collision signal generation module, a reverse connection protection module, a current limiting drive module, an isolation drive module, and a signal output module. The input terminal of the collision signal generation module is connected to the collision sensor, and the output terminal of the collision signal generation module is connected to the reverse connection protection module. The output terminal of the reverse connection protection module is connected to the input side of the isolation drive module through the current limiting drive module, and the output side of the isolation drive module is connected to the signal output module. By setting up the reverse connection protection module, rectification can be achieved normally through the reverse connection protection module regardless of whether the connection between the circuit under test and the reverse connection protection module is positive or negative, preventing detection abnormalities caused by reverse connection. At the same time, the isolation drive module isolates the signal input and output, increasing the stability of collision signal detection. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 is a functional block diagram of an embodiment of the collision signal detection circuit of this application;

[0037] Figure 2 is a circuit structure diagram of the collision signal detection circuit of this application applied in an embodiment.

[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0039] Explanation of icon numbers: Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0044] This application provides a collision signal detection circuit, applied in a collision signal detection device. Please refer to Figure 1, which is a functional block diagram of an embodiment of the collision signal detection circuit of this application. In this embodiment, the collision detection circuit is connected to the circuit under test. The collision detection circuit includes a reverse connection protection module 100, a current limiting drive module 200, an isolation drive module 300, and a signal output module. The reverse connection protection module 100 is connected to the circuit under test to detect collision signals in the circuit under test. The output terminal of the reverse connection protection module 100 is connected to the input side of the isolation drive module 300 through the current limiting drive module 200, and the output side of the isolation drive module 300 is connected to the signal output module.

[0045] The circuit under test is used to output a collision signal when a collision event occurs; the specific type of the circuit under test can be set according to actual needs, such as using a collision sensor; the circuit under test in this embodiment is a current type.

[0046] The reverse connection protection module 100 is used to rectify the collision signal. It can be understood that the input terminal of the reverse connection protection module 100 is not distinguished by positive or negative. Therefore, regardless of whether the circuit under test is connected in the positive or negative direction, it can achieve normal rectification through the reverse connection protection module 100, thus achieving the function of preventing reverse connection.

[0047] The current limiting driver module 200 is used to limit the current of the signal after rectification by the reverse connection protection module 100, so as to avoid the signal from impacting the isolation driver module 300 and improve the stability of the system.

[0048] The isolation driver module 300 is used to isolate the signal input side and the output side, thereby enhancing the circuit's anti-interference capability and preventing interference caused by different reference ground potentials from affecting the detection results; the first side is the signal input side, and the second side is the signal output side.

[0049] The signal output unit is used to determine the final output drive signal based on the signal output by the isolation drive module 300. It can be understood that the drive signal corresponds to the collision signal and reflects the characteristics of the collision signal. For example, the drive signal can characterize whether a collision event has occurred, and it can also characterize the collision intensity when a collision event occurs.

[0050] This embodiment sets up a reverse connection protection module 100 so that the circuit under test can be rectified normally through the reverse connection protection module 100 regardless of whether the circuit under test is connected to the reverse connection protection module 100 in the correct direction or in the reverse direction, thus preventing detection abnormalities caused by reverse connection. At the same time, an isolation drive module 300 is set up to isolate the signal input and output, thereby increasing the stability of collision signal detection.

[0051] Further, referring to Figure 2, the collision signal detection circuit includes a first resistor R1; wherein:

[0052] The first end of the first resistor R1 is connected to the first input end of the reverse connection protection module 100;

[0053] The second end of the first resistor R1 is connected to the second input end of the reverse connection protection module 100.

[0054] The positive input terminal of the circuit under test is connected to the positive output terminal of the circuit under test, and the negative input terminal of the circuit under test is connected to the negative output terminal of the circuit under test.

[0055] The circuit under test in this embodiment is current-type, therefore, the current signal output by the circuit under test needs to be converted into a voltage signal. In this embodiment, a first resistor R1 is set. When a collision signal is input, the collision signal flows through the first resistor R1 and generates a voltage across the first resistor R1. At the same time, the two ends of the first resistor R1 are respectively connected to the two input terminals of the reverse connection protection module 100. The voltage across the first resistor R1 is input to the reverse connection protection module 100 for rectification.

[0056] Furthermore, it also includes an electrostatic discharge (ESD) protection circuit 500 disposed between the reverse connection protection module and the circuit under test. The ESD protection circuit 500 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first bidirectional Zener diode DB1, and a second bidirectional Zener diode DB2; wherein:

[0057] The first terminal of the first capacitor C1 is connected to the positive input terminal of the circuit under test. The first terminal of the second capacitor C2 is connected to the negative input terminal of the circuit under test. The second terminal of the first capacitor C1 is connected to the second terminal of the second capacitor C2. The first bidirectional Zener diode DB1 is connected in parallel with the first capacitor C1. The second bidirectional Zener diode DB2 is connected in parallel with the second capacitor C2. The second terminal of the first capacitor C1 is also connected to the floating ground. The third capacitor C3 is connected between the floating ground and the earth ground.

[0058] The first capacitor C1 and the second capacitor C2 are used to filter the collision signal; the first bidirectional Zener diode DB1 and the second bidirectional Zener diode DB2 are used for voltage regulation.

[0059] The earth ground is the grounding point of the device casing, and the floating ground is the virtual ground in the circuit. It can be understood that the potentials of the earth ground and the floating ground are not necessarily the same; the floating ground discharges electrical energy to the earth ground through the first capacitor C1. It should be noted that in this application, the devices on the input side of the isolation drive module 300 are connected to the floating ground, and the devices on the output side of the isolation drive module 300 are connected to the earth ground. Subsequent grounding will follow this rule and will not be described again.

[0060] Furthermore, the reverse connection protection module 100 includes a first MOSFET T1, a second MOSFET T2, a third MOSFET T3, a fourth MOSFET T4, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; wherein:

[0061] The gate of the first MOSFET T1 is connected to the first input terminal of the reverse connection protection module through the second resistor R2. The gate of the first MOSFET T1 is also connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the anode of the current limiting drive module 200. The source of the first MOSFET T1 is connected to the anode of the current limiting drive module 200. The drain of the first MOSFET T1 is connected to the second input terminal of the reverse connection protection module. Preferably, when the circuit under test is connected to the reverse connection protection module in the correct direction, the first input terminal of the reverse connection protection module is connected to the anode of the circuit under test, and the second input terminal of the reverse connection protection module is connected to the cathode of the circuit under test.

[0062] The gate of the second MOSFET T2 is connected to the second input terminal of the reverse connection protection module through the third resistor R3. The gate of the second MOSFET T2 is also connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the anode of the current limiting drive module 200. The source of the second MOSFET T2 is connected to the anode of the current limiting drive module 200. The drain of the second MOSFET T2 is connected to the first input terminal of the reverse connection protection module.

[0063] The gate of the third MOSFET T3 is connected to the first input terminal of the reverse connection protection module through the fourth resistor R4. The gate of the third MOSFET T3 is also connected to the negative terminal of the third diode D3. The positive terminal of the third diode D3 is connected to the negative input terminal of the current limiting drive module. The negative input terminal of the current limiting drive module is grounded. The drain of the third MOSFET T3 is grounded. The source of the third MOSFET T3 is connected to the second input terminal of the reverse connection protection module.

[0064] The gate of the fourth MOSFET T4 is connected to the second input terminal of the reverse connection protection module through the fifth resistor R5. The gate of the fourth MOSFET T4 is also connected to the negative terminal of the fourth diode D4. The positive terminal of the fourth diode D4 is grounded. The drain of the fourth MOSFET T4 is grounded. The source of the fourth MOSFET T4 is connected to the second input terminal of the reverse connection protection module.

[0065] In this embodiment, the first MOSFET T1 and the second MOSFET T2 are PMOS transistors, and the third MOSFET T3 and the fourth MOSFET T4 are NMOS transistors.

[0066] When the circuit under test is connected in the forward direction, the second MOSFET T2 is turned on, and the signal flows out from the second MOSFET T2 to the current limiting drive module 200; when the collision signal is connected in the reverse direction, the first MOSFET T1 is turned on, and the signal flows out from the first MOSFET T1 to the current limiting drive module 200; the diode is used to provide voltage limiting protection for the corresponding MOSFET.

[0067] Furthermore, the current-limiting drive module 200 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fourth capacitor C4; wherein:

[0068] The base of the first transistor Q1 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the positive terminal of the reverse connection protection module 100, the second end of the sixth resistor R6 is also grounded through the seventh resistor R7, and the base of the first transistor Q1 is also grounded through the eighth resistor R8 and the fourth capacitor C4 respectively; the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the collector of the second transistor Q2 and the base of the third transistor Q3 through the ninth resistor R9;

[0069] The emitter of the second transistor Q2 is connected to the positive terminal of the reverse connection protection module 100. The emitter of the second transistor Q2 is also connected to the base of the second transistor Q2 through the tenth resistor R10. The base of the second transistor Q2 is connected to the base of the third transistor Q3 through the eleventh resistor R11. The base of the second transistor Q2 is also connected to the emitter of the third transistor Q3. The collector of the third transistor Q3 is grounded through the twelfth resistor R12. The collector of the third transistor Q3 is also connected to the input side of the isolation drive module 300.

[0070] In this embodiment, the first transistor Q1 is NPN type, and the second transistor Q2 and the third transistor Q3 are PNP type.

[0071] When the reverse connection protection circuit is not outputting voltage, the first transistor Q1 is turned off, therefore, the third transistor Q3 is turned off, therefore, the second transistor Q2 is turned off;

[0072] When the reverse connection protection circuit outputs voltage, the first transistor Q1 is turned on. Therefore, the base of the third transistor Q3 is grounded, and the third transistor Q3 is turned on. At this time, the voltage output by the reverse connection protection circuit is output to the first side of the isolation drive module 300 through the tenth resistor R10 and the third transistor Q3. When the current value in the circuit is greater than the preset current value, the second transistor Q2 is turned on. At this time, most of the current is output to ground through the second transistor Q2, the ninth resistor R9, and the first transistor Q1, realizing the current limiting protection of the circuit. The preset current value can be set by adjusting the resistance value of the tenth resistor R10.

[0073] Furthermore, the isolation driver module 300 includes an optocoupler U1; wherein:

[0074] The positive terminal of optocoupler U1 is connected to the current limiting drive module 200, the negative terminal of optocoupler U1 is grounded, the collector of optocoupler U1 is connected to the input terminal of the signal output module, and the emitter of optocoupler U1 is grounded.

[0075] When the current limiting drive module 200 does not output voltage, the light-emitting diode on the first side of optocoupler U1 is turned off, and the second side of optocoupler U1 is not conducting.

[0076] When the current limiting drive module 200 outputs voltage, the light-emitting diode on the first side of optocoupler U1 is turned on, the second side of optocoupler U1 is turned on, and the input terminal of the signal output module is grounded.

[0077] Furthermore, the signal output module includes a trigger time configuration unit 410, a signal latch unit 420, and a power holding unit 430; the input terminal of the trigger time configuration unit 410 is connected to the output side of the isolation drive module 300, the output terminal of the trigger time configuration unit 410 is connected to the signal latch unit 420, and the power supply terminals of the trigger time configuration unit 410 and the signal latch unit 420 are connected to the power holding unit 430.

[0078] The trigger time configuration unit 410 is used to set the detection sensitivity; it is understood that in practical applications, interference from the application environment or device errors may cause false triggering of the collision signal.

[0079] Therefore, to avoid this problem, this embodiment sets up a trigger event configuration module. Only when the trigger collision signal is greater than a preset value and the duration reaches a preset duration will the signal be transmitted to the back circuit to generate a drive signal, thereby avoiding interference and improving the accuracy of collision signal detection.

[0080] The signal latch unit 420 is used to convert the signal output by the trigger event configuration module into a drive signal output.

[0081] The power holding unit 430 is used to maintain the circuit power supply when the power supply is disconnected. It is understood that when a trigger event occurs, it may cause the circuit or some components to be disconnected. At this time, it is the scenario that needs to detect the collision signal. Therefore, in order to ensure the power supply in this scenario, the power holding unit 430 is set in this embodiment so that the collision signal detection circuit can still be powered when the power supply is disconnected, so as to ensure the detection of the collision signal.

[0082] Furthermore, the trigger timing configuration unit 410 includes a fourth transistor Q4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth capacitor C5, and a comparator U2; wherein:

[0083] The base of the fourth transistor Q4 is connected to the output side of the isolation drive module 300 through the thirteenth resistor R13. The base of the fourth transistor Q4 is also connected to the power supply holding unit 430 through the fourteenth resistor R14. The emitter of the fourth transistor Q4 is connected to the power supply holding unit 430. The collector of the fourth transistor Q4 is grounded through the fifteenth resistor R15. The collector of the fourth transistor Q4 is also connected to the input terminal of comparator U2 through the sixteenth resistor R16. The input terminal of comparator U2 is also grounded through the fifth capacitor C5. The power supply terminal of comparator U2 is connected to the power supply holding unit 430. The output terminal of comparator U2 is connected to the signal latch unit 420.

[0084] The fourteenth resistor R14 is the pull-up resistor for the fourth transistor Q4; in this embodiment, the fourth transistor Q4 is a PNP transistor.

[0085] When the isolation drive circuit is turned on, the base of the fourth transistor Q4 is at a low level, the fourth switch is turned on, and the voltage output by the power holding unit 430 charges the fifth capacitor C5 through the fourth switch and the sixteenth resistor R16. The voltage of the fifth capacitor C5 gradually increases. When the voltage of the fifth capacitor C5 increases to the preset voltage of the comparator U2, the comparator U2 outputs a high level to the signal latch unit 420.

[0086] The preset duration of the trigger time configuration unit 410 can be set by selecting the fifth capacitor C5 and the ratio of the fifteenth resistor R15 and the sixteenth resistor R16; the preset duration refers to the time it takes for the fifth capacitor C5 to charge to the preset voltage of the comparator U2.

[0087] When a momentary disturbance occurs, the presence of the fifth capacitor C5 will prevent the comparator U2 from outputting a signal, thus avoiding accidental interference.

[0088] The specific structure and preset voltage of comparator U2 can be set according to actual needs. Preferably, an LM2903Q comparator can be used, and the recommended connection method of this comparator can be used to connect it into the circuit of this application.

[0089] Furthermore, the signal latch unit 420 includes a flip-flop U3; wherein:

[0090] The input terminal of the trigger U3 is connected to the output terminal of the trigger time configuration unit 410, and the power supply terminal of the trigger U3 is connected to the power supply holding unit 430.

[0091] The output of trigger U3 is used to output the collision drive signal.

[0092] When trigger U3 receives the signal output by trigger time configuration unit 410, it outputs a drive signal.

[0093] The specific type and structure of the trigger U3 can be set according to actual needs. Preferably, a 74LVC1G175GV-Q100H trigger can be used, which is connected to the circuit of this application using the connection method recommended by the manufacturer.

[0094] Furthermore, the power supply holding unit 430 includes an anti-reverse filter unit U4, a voltage regulator U5, and a sixth capacitor C6; wherein:

[0095] The input terminal of the anti-reverse filtering module is connected to the power supply, the output terminal of the anti-reverse filtering module is grounded through the sixth capacitor C6, the output terminal of the anti-reverse filtering module is connected to the input terminal of the voltage regulator U5, the first output terminal of the voltage regulator U5 is connected to the power supply terminal of the trigger time configuration unit 410, and the second output terminal of the voltage regulator U5 is connected to the power supply terminal of the signal latch unit 420.

[0096] The reverse protection filter module is used to filter the voltage input to the power supply; at the same time, the reverse protection structure can be set to prevent the power supply from being connected in reverse. The specific structure can be set according to actual needs. Preferably, the reverse protection filter module uses a 1N4007 diode.

[0097] The sixth capacitor C6 is used to maintain the power supply. It is understood that the capacitor voltage cannot change abruptly. Therefore, when the power supply is connected, the sixth capacitor C6 is charged by the power supply. When the power supply is disconnected, the voltage of the sixth capacitor C6 will drop slowly, and it can still supply power to the subsequent circuits for a period of time.

[0098] Voltage regulator U5 is used to regulate the voltage and convert it into the required voltage value for output to trigger time configuration unit 410 and signal latch unit 420. The specific type of voltage regulator U5 can be set according to actual needs. Preferably, the voltage regulator is LN20342Q1LDO, which is connected to the circuit of this application using its recommended connection method.

[0099] This application also protects a collision signal detection device, which includes a housing and a collision signal detection circuit. The collision signal detection circuit is disposed within the housing, and its structure can be referred to the above embodiment, and will not be repeated here. Accordingly, since the collision signal detection device of this embodiment adopts the technical solution of the above-described collision signal detection circuit, it possesses all the beneficial effects of the above-described collision signal detection circuit.

[0100] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. The sequence numbers of the embodiments described above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0101] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A collision signal detection circuit, wherein, The collision detection circuit includes a reverse connection protection module, a current limiting drive module, an isolation drive module, and a signal output module. The reverse connection protection module is used to connect to the circuit under test. The output terminal of the reverse connection protection module is connected to the input side of the isolation drive module through the current limiting drive module. The output side of the isolation drive module is connected to the signal output module. The reverse connection protection module is used to generate a collision detection signal whose current flow direction is adapted to the current limiting drive module according to the current flow direction in the circuit under test. The current limiting drive module is used to limit the current of the collision detection signal. The isolation drive module is used to isolate the collision detection signal to improve the anti-interference capability of the collision detection signal.

2. The collision signal detection circuit as described in claim 1, wherein, The reverse connection protection module includes a first input terminal and a second input terminal, which are used to connect to the circuit under test. The collision signal detection circuit also includes a first resistor. The first end of the first resistor is connected to the first input end of the reverse connection protection module; The second end of the first resistor is connected to the second input end of the reverse connection protection module.

3. The collision signal detection circuit as described in claim 1, wherein, It also includes an electrostatic discharge (ESD) protection circuit disposed between the reverse connection protection module and the circuit under test, the ESD protection circuit including a first capacitor, a second capacitor, a third capacitor, a first bidirectional Zener diode, and a second bidirectional Zener diode; wherein: The first terminal of the first capacitor is used to connect to the positive input terminal of the circuit under test, the first terminal of the second capacitor is used to connect to the negative input terminal of the circuit under test, the second terminal of the first capacitor is electrically connected to the second terminal of the second capacitor, the first bidirectional Zener diode is connected in parallel with the first capacitor, the second bidirectional Zener diode is connected in parallel with the second capacitor, the second terminal of the first capacitor is also connected to the floating ground, and the third capacitor is connected between the floating ground and the earth ground.

4. The collision signal detection circuit as described in claim 2, wherein, The reverse connection protection module includes a first MOSFET, a second MOSFET, a third MOSFET, a fourth MOSFET, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, a third diode, and a fourth diode; wherein: The gate of the first MOSFET is connected to the first input terminal of the reverse connection protection module through the second resistor. The gate of the first MOSFET is also connected to the anode of the first diode. The cathode of the first diode is connected to the anode input terminal of the current limiting drive module. The source of the first MOSFET is connected to the anode input terminal of the current limiting drive module. The drain of the first MOSFET is connected to the second input terminal of the reverse connection protection module. The gate of the second MOSFET is connected to the second input terminal of the reverse connection protection module through the third resistor. The gate of the second MOSFET is also connected to the anode of the second diode. The cathode of the second diode is connected to the anode input terminal of the current limiting drive module. The source of the second MOSFET is connected to the anode input terminal of the current limiting drive module. The drain of the second MOSFET is connected to the first input terminal of the reverse connection protection module. The gate of the third MOS transistor is connected to the first input terminal of the reverse connection protection module through the fourth resistor. The gate of the third MOS transistor is also connected to the negative terminal of the third diode. The positive terminal of the third diode is connected to the negative input terminal of the current limiting drive module. The negative input terminal of the current limiting drive module is grounded. The drain of the third MOS transistor is grounded. The source of the third MOS transistor is connected to the second input terminal of the reverse connection protection module. The gate of the fourth MOS transistor is connected to the second input terminal of the reverse connection protection module through the fifth resistor. The gate of the fourth MOS transistor is also connected to the negative terminal of the fourth diode. The positive terminal of the fourth diode is grounded, the drain of the fourth MOS transistor is grounded, and the source of the fourth MOS transistor is connected to the second input terminal of the reverse connection protection module.

5. The collision signal detection circuit as described in claim 1, wherein, The current-limiting drive module includes a first transistor, a second transistor, a third transistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth capacitor; wherein: The base of the first transistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the positive input terminal of the current-limiting drive module, the second end of the sixth resistor is connected to the negative input terminal of the current-limiting drive module through the seventh resistor, the negative input terminal of the current-limiting drive module is grounded, the base of the first transistor is also grounded through the eighth resistor and the fourth capacitor; the emitter of the first transistor is grounded, and the collector of the first transistor is connected to the collector of the second transistor and the base of the third transistor through the ninth resistor; The emitter of the second transistor is connected to the positive input terminal of the current-limiting drive module. The emitter of the second transistor is also connected to the base of the second transistor through the tenth resistor. The base of the second transistor is connected to the base of the third transistor through the eleventh resistor. The base of the second transistor is also connected to the emitter of the third transistor. The collector of the third transistor is grounded through the twelfth resistor. The collector of the third transistor is also connected to the input side of the isolation drive module.

6. The collision signal detection circuit as described in claim 1, wherein, The isolation driving module includes an optocoupler; wherein: The positive terminal of the optocoupler is connected to the current-limiting drive module, the negative terminal of the optocoupler is grounded, the collector of the optocoupler is connected to the input terminal of the signal output module, and the emitter of the optocoupler is grounded.

7. The collision signal detection circuit as described in claim 1, wherein, The signal output module includes a trigger time configuration unit, a signal latch unit, and a power supply holding unit. The input terminal of the trigger time configuration unit is connected to the output side of the isolation drive module, the output terminal of the trigger time configuration unit is connected to the signal latch unit, the power supply terminals of the trigger time configuration unit and the signal latch unit are connected to the power supply holding unit, and the trigger time configuration unit outputs a signal when the received signal is greater than a preset value and the duration exceeds a limited duration.

8. The collision signal detection circuit as described in claim 7, wherein, The trigger time configuration unit includes a fourth transistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, and a comparator; wherein: The base of the fourth transistor is connected to the output side of the isolation drive module through the thirteenth resistor. The base of the fourth transistor is also connected to the power supply holding unit through the fourteenth resistor. The emitter of the fourth transistor is connected to the power supply holding unit. The collector of the fourth transistor is grounded through the fifteenth resistor. The collector of the fourth transistor is also connected to the input terminal of the comparator through the sixteenth resistor. The input terminal of the comparator is also grounded through the fifth capacitor. The power supply terminal of the comparator is connected to the power supply holding unit. The output terminal of the comparator is connected to the signal latching unit.

9. The collision signal detection circuit as described in claim 7, wherein, The power supply holding unit includes an anti-reverse filter unit, a voltage regulator, and a sixth capacitor; wherein: The input terminal of the anti-reverse filtering module is connected to the power supply, the output terminal of the anti-reverse filtering module is grounded through the sixth capacitor, the output terminal of the anti-reverse filtering module is connected to the input terminal of the voltage regulator, the first output terminal of the voltage regulator is connected to the power supply terminal of the trigger time configuration unit, and the second output terminal of the voltage regulator is connected to the power supply terminal of the signal latch unit.

10. The collision signal detection circuit as described in claim 3, wherein, The first and second capacitors are used to filter the collision signal; the first and second bidirectional Zener diodes are used for voltage regulation.

11. The collision signal detection circuit as described in claim 4, wherein, When the circuit under test is connected to the reverse connection protection module in the correct direction, the first input terminal of the reverse connection protection module is connected to the positive input terminal of the circuit under test, and the second input terminal of the reverse connection protection module is connected to the negative input terminal of the circuit under test.

12. The collision signal detection circuit as described in claim 4, wherein, The first and second MOSFETs are PMOS, while the third and fourth MOSFETs are NMOS.

13. The collision signal detection circuit as described in claim 5, wherein, The first transistor is NPN type, while the second and third transistors are PNP type.

14. The collision signal detection circuit as described in claim 8, wherein, The fourteenth resistor is the pull-up resistor for the fourth transistor; the fourth transistor is a PNP transistor.

15. A collision signal detection device, wherein, The collision signal detection device includes a housing and a collision signal detection circuit as described in any one of claims 1 to 9, wherein the collision signal detection circuit is disposed within the housing.

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