Collision signal detection circuit and collision signal detection device

Abstract

The utility model provides a collision signal detection circuit and a collision signal detection device. The collision signal detection circuit comprises an anti-reverse connection module, a current-limiting driving module, an isolation driving module and a signal output module. The anti-reverse-connection module is connected with a to-be-detected circuit to detect a collision signal in the to-be-detected circuit, the output end of the anti-reverse-connection module is connected with the input side of the isolation driving module through the current limiting driving module, and the output side of the isolation driving module is connected with the signal output module. By arranging the anti-reverse-connection module, rectification can be normally realized through the anti-reverse-connection module no matter whether the circuit to be detected and the anti-reverse-connection module are in positive connection or reverse connection, and detection abnormity caused by reverse connection is prevented; meanwhile, the isolation driving module is arranged, so that signal input and output are isolated, and the stability of collision signal detection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a collision signal detection circuit and a collision signal detection device. Background Art

[0002] In the existing field of collision signal detection technology, due to the long distance between the signal output sensor and the signal detection circuit and the complex electromagnetic environment on the entire vehicle, the existing technology has limited anti-interference ability; and when the detection circuit is reversed, the collision signal detection function fails and the stability of the collision signal detection is low. Utility Model Content

[0003] The main purpose of the utility model is to provide a collision signal detection circuit and a collision signal detection device, aiming to solve the problem of low stability of collision signal detection in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides a collision signal detection circuit, which is used to be connected to a circuit to be tested, and the collision signal detection circuit includes an anti-reverse connection module, a current limiting drive module, an isolation drive module and a signal output module; the anti-reverse connection module is used to be connected to the circuit to be tested to detect a collision signal in the circuit to be tested, the output end of the anti-reverse connection 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, the anti-reverse connection module is used to generate a collision detection signal whose current flow direction is adapted to the current limiting drive module according to the flow direction of the current in the circuit to be tested, the current limiting drive module is used to limit the current of the collision detection signal, and the isolation drive module is used to isolate the collision detection signal to improve the anti-interference ability of the collision detection signal.

[0005] Optionally, the anti-reverse connection module includes a first input terminal and a second input terminal, the first input terminal and the second input terminal are used to be connected to the circuit to be tested, and the collision signal detection circuit further includes a first resistor, wherein:

[0006] The first end of the first resistor is connected to the first input end of the anti-reverse connection module;

[0007] The second end of the first resistor is connected to the second input end of the reverse connection prevention module.

[0008] Optionally, an electrostatic protection circuit is further included, and the electrostatic protection circuit includes a first capacitor, a second capacitor, a third capacitor, a first bidirectional voltage regulator, and a second bidirectional voltage regulator; wherein:

[0009] The first end of the first capacitor is used to connect to the positive input terminal of the circuit to be tested, the first end of the second capacitor is used to connect to the negative input terminal of the circuit to be tested, the second end of the first capacitor is electrically connected to the second end of the second capacitor, the first bidirectional voltage regulator is connected in parallel with the first capacitor, the second bidirectional voltage regulator is connected in parallel with the second capacitor, the second end of the first capacitor is also connected to the floating ground, and the third capacitor is connected between the floating ground and the ground.

[0010] Optionally, the anti-reverse connection module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, 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:

[0011] The gate of the first MOS transistor is connected to the first input terminal of the collision signal detection circuit through the second resistor, the gate of the first MOS transistor is also connected to the anode of the first diode, the cathode of the first diode is connected to the positive input terminal of the current limiting driving module, the source of the first MOS transistor is connected to the positive input terminal of the current limiting driving module, and the drain of the first MOS transistor is connected to the negative input terminal of the collision signal detection circuit;

[0012] The gate of the second MOS transistor is connected to the second input terminal of the collision signal detection circuit through the third resistor, the gate of the second MOS transistor is also connected to the anode of the second diode, the cathode of the second diode is connected to the positive input terminal of the current limiting driving module, the source of the second MOS transistor is connected to the positive input terminal of the current limiting driving module, and the drain of the second MOS transistor is connected to the positive input terminal of the circuit to be tested;

[0013] The gate of the third MOS transistor is connected to the first input terminal of the circuit to be tested via the fourth resistor, the gate of the third MOS transistor is also connected to the cathode of the third diode, the anode of the third diode is grounded, the drain of the third MOS transistor is grounded, and the source of the third MOS transistor is connected to the negative input terminal of the circuit to be tested;

[0014] The gate of the fourth MOS transistor is connected to the second input terminal of the circuit to be tested through the fifth resistor. The gate of the fourth MOS transistor is also connected to the cathode of the fourth diode. The anode of the fourth diode is grounded. The drain of the fourth MOS transistor is grounded. The source of the fourth MOS transistor is connected to the positive input terminal of the circuit to be tested.

[0015] Optionally, the current limiting driving 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:

[0016] 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 electrode of the anti-reverse connection module, the second end of the sixth resistor is further grounded via the seventh resistor, and the base of the first transistor is further grounded via 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 respectively via the ninth resistor;

[0017] The emitter of the second transistor is connected to the positive electrode of the anti-reverse connection 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 collector 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, and the collector of the third diode is also connected to the first side of the isolation driving module.

[0018] Optionally, the isolation driving module includes an optical coupler; wherein:

[0019] The positive electrode of the optocoupler is connected to the current limiting driving module, the negative electrode of the optocoupler is grounded, the collector of the optocoupler is connected to the input end of the signal output module, and the emitter of the optocoupler is grounded.

[0020] Optionally, the signal output module includes a trigger time configuration unit, a signal latch unit and a power supply holding unit; the input end of the trigger time configuration unit is connected to the second side of the isolation driving module, the output end of the trigger time configuration unit is connected to the signal latch unit, the power supply end of the trigger time configuration unit and the power supply end of the signal latch unit are connected to the power supply holding unit, and the trigger time configuration unit outputs a signal when the signal it receives is greater than a preset value and the duration exceeds a specified time length.

[0021] 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:

[0022] The base of the fourth transistor is connected to the second side of the isolation driving 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 end of the comparator through the sixteenth resistor, the input end of the comparator is also grounded through the fifth capacitor, the power supply end of the comparator is connected to the power supply holding unit, and the output end of the comparator is connected to the signal latch unit.

[0023] Optionally, the power supply maintaining unit includes an anti-reverse filtering unit, a voltage stabilizer, and a sixth capacitor; wherein:

[0024] The input end of the anti-reverse filtering unit is connected to the power supply, the output end of the anti-reverse filtering unit is grounded through the sixth capacitor, the output end of the anti-reverse filtering unit is connected to the input end of the voltage regulator, the first output end of the voltage regulator is connected to the power supply end of the trigger time configuration unit, and the second output end of the voltage regulator is connected to the power supply end of the signal latch unit.

[0025] In addition, to achieve the above-mentioned purpose, the present invention further provides a collision signal detection device, which includes a housing and the above-mentioned collision signal detection circuit, wherein the collision signal detection circuit is disposed in the housing.

[0026] The utility model proposes a collision signal detection circuit and a collision signal detection device, wherein the collision signal detection circuit is connected to a collision sensor, and the collision signal detection circuit includes a collision signal generation module, an anti-reverse connection module, a current limiting drive module, an isolation drive module, and a signal output module; the input end of the collision signal generation module is connected to the collision sensor, the output end of the collision signal generation module is connected to the anti-reverse connection module, the output end of the anti-reverse connection module is connected to the first side of the isolation drive module through the current limiting drive module, and the input side of the isolation drive module is connected, and the output side of the isolation drive module is connected to the signal output module. By setting the anti-reverse connection module, no matter whether the circuit to be tested is connected in the forward or reverse direction with the anti-reverse connection module, rectification can be achieved normally through the anti-reverse connection module, thereby preventing detection abnormalities caused by reverse connection; at the same time, the isolation drive module is set to isolate the signal input and output, thereby increasing the stability of collision signal detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a functional module diagram of an embodiment of a collision signal detection circuit of the present utility model;

[0029] Figure 2 The utility model collision signal detection circuit is applied in Figure 1 Circuit structure diagram in the embodiment.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0031] Description of Figure Numbers:

[0032] Label name Label name 100 Anti-reverse polarity module R1~R16 The first to sixteenth resistors 200 Current limiting driver module C1~C6 The first to sixth capacitors 300 Isolation driver module T1~T4 The first to fourth MOS tubes 410 Trigger time configuration unit Q1~Q4 The first to fourth transistors 420 Signal latch unit D1~D4 The first to fourth diodes 430 Power supply maintenance unit DB1~DB2 First and second bidirectional voltage regulator tubes 500 ESD protection circuit U2 Comparator U1 Optocoupler U3 trigger U5 voltage regulator U4 Anti-reverse polarity filter module DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0037] This utility model provides a collision signal detection circuit, which is used in a collision signal detection device. Figure 1 , Figure 1 This is a functional module diagram of an embodiment of a collision signal detection circuit of the present invention. In this embodiment, the collision signal detection circuit is connected to a circuit under test and includes an anti-reverse connection module 100, a current limiting driver module 200, an isolation driver module 300, and a signal output module. The anti-reverse connection module 100 is connected to the circuit under test to detect a collision signal in the circuit under test. The output end of the anti-reverse connection module 100 is connected to the input side of the isolation driver module 300 through the current limiting driver module 200, and the output side of the isolation driver module 300 is connected to the signal output module. The anti-reverse connection module 100 is used to generate a collision detection signal whose current flow direction is adapted to the current limiting driver module based on the flow direction of the current in the circuit under test. The current limiting driver module 200 is used to limit the current of the collision detection signal, and the isolation driver module 300 is used to isolate the collision detection signal to improve the anti-interference performance of the collision detection signal.

[0038] The circuit to be tested is used to output a collision signal when a collision event occurs. The specific type of the circuit to be tested can be set based on actual needs, such as using a collision sensor. The circuit to be tested in this embodiment is a current type.

[0039] The anti-reverse connection module 100 is used to rectify the collision signal; it can be understood that the input end of the anti-reverse connection module 100 does not distinguish between positive and negative. Therefore, no matter whether the circuit to be tested is connected in the forward or reverse direction, normal rectification can be achieved through the anti-reverse connection module 100, and the anti-reverse connection function is achieved through the anti-reverse connection module 100.

[0040] The current limiting driving module 200 is used to limit the current of the signal rectified by the anti-reverse connection module 100, thereby preventing the signal from impacting the isolation driving module 300 and improving the stability of the system.

[0041] The isolation driving module 300 is used to isolate the signal input side from the output side, thereby enhancing the anti-interference capability of the circuit and preventing interference caused by different reference ground potentials from affecting the detection results.

[0042] 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 represent whether a collision event occurs and can also represent the collision intensity when a collision event occurs.

[0043] In this embodiment, an anti-reverse connection module 100 is provided so that no matter whether the circuit to be tested is connected to the anti-reverse connection module 100 in the forward or reverse direction, rectification can be normally achieved through the anti-reverse connection module 100, thereby preventing detection abnormalities caused by reverse connection; at the same time, an isolation drive module 300 is provided to isolate the signal input and output, thereby increasing the stability of collision signal detection.

[0044] Further, see Figure 2 The anti-reverse connection module 100 includes a first input terminal and a second input terminal, wherein the first input terminal and the second input terminal are used to connect to the circuit to be tested, and the collision signal detection circuit also includes a first resistor, wherein: the collision signal detection circuit includes a first resistor R1; wherein:

[0045] The first end of the first resistor R1 is connected to the first input end of the anti-reverse connection module 100;

[0046] The second end of the first resistor R1 is connected to the second input end of the reverse connection prevention module 100 .

[0047] The positive input terminal of the circuit to be tested is connected to the positive output terminal of the circuit to be tested, and the negative input terminal of the circuit to be tested is connected to the negative output terminal of the circuit to be tested.

[0048] The circuit to be tested in this embodiment is a current type, and therefore, the current signal output by the circuit to be tested needs to be converted into a voltage signal. In this embodiment, a first resistor R1 is provided. 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 ends of the anti-reverse connection module 100, and the voltage across the first resistor R1 is input to the anti-reverse connection module 100 for rectification.

[0049] Furthermore, an electrostatic protection circuit 500 is included. The electrostatic protection circuit 500 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first bidirectional voltage regulator DB1, and a second bidirectional voltage regulator DB2; wherein:

[0050] The first end of the first capacitor C1 is used to connect to the positive input terminal of the circuit to be tested, the first end of the second capacitor C2 is used to connect to the negative input terminal of the circuit to be tested, the second end of the first capacitor C1 is electrically connected to the second end of the second capacitor C2, the first bidirectional voltage regulator DB1 is connected in parallel with the first capacitor C1, the second bidirectional voltage regulator DB2 is connected in parallel with the second capacitor C2, the second end of the first capacitor C1 is also connected to the floating ground, and the third capacitor C3 is connected between the floating ground and the ground.

[0051] The first capacitor C1 and the second capacitor C2 are used for filtering the collision signal; the first bidirectional voltage regulator DB1 and the second bidirectional voltage regulator DB2 are used for voltage stabilization.

[0052] The earth ground is the device housing ground, and the floating ground is the virtual ground in the circuit. It is understood that the earth ground and the floating ground are not necessarily at the same potential; the floating ground discharges electrical energy to the earth ground via the first capacitor C1. It should be noted that in this application, the components on the first side of the isolation driver module 300 are connected to the floating ground, while the components on the second side of the isolation driver module 300 are connected to the earth ground. Subsequent grounding follows this rule and will not be further explained.

[0053] Furthermore, the reverse connection prevention module 100 includes a first MOS transistor T1, a second MOS transistor T2, a third MOS transistor T3, a fourth MOS transistor 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:

[0054] The gate of the first MOS transistor T1 is connected to the positive input terminal of the circuit under test through the second resistor R2. The gate of the first MOS transistor T1 is also connected to the positive electrode of the first diode D1. The cathode of the first diode D1 is connected to the input terminal of the current limiting driver module 200. The source of the first MOS transistor T1 is connected to the input terminal of the current limiting driver module 200. The drain of the first MOS transistor T1 is connected to the negative input terminal of the circuit under test.

[0055] The gate of the second MOS transistor T2 is connected to the negative input terminal of the circuit under test through the third resistor R3. The gate of the second MOS transistor T2 is also connected to the positive electrode of the second diode D2. The negative electrode of the second diode D2 is connected to the positive input terminal of the current limiting driver module 200. The source of the second MOS transistor T2 is connected to the positive input terminal of the current limiting driver module 200. The drain of the second MOS transistor T2 is connected to the positive input terminal of the circuit under test.

[0056] The gate of the third MOS transistor T3 is connected to the positive terminal of the circuit under test through the fourth resistor R4. The gate of the third MOS transistor T3 is also connected to the negative terminal of the third diode D3. The positive terminal of the third diode D3 is grounded. The drain of the third MOS transistor T3 is grounded. The source of the third MOS transistor T3 is connected to the negative terminal of the circuit under test.

[0057] The gate of the fourth MOS transistor T4 is connected to the negative terminal of the circuit to be tested through the fifth resistor R5. The gate of the fourth MOS transistor T4 is also connected to the negative terminal of the fourth diode D4. The anode of the fourth diode D4 is grounded. The drain of the fourth MOS transistor T4 is grounded. The source of the fourth MOS transistor T4 is connected to the positive terminal of the circuit to be tested.

[0058] In this embodiment, the first MOS transistor T1 and the second MOS transistor T2 are PMOS transistors, and the third MOS transistor T3 and the fourth MOS transistor T4 are NMOS transistors.

[0059] When the circuit to be tested is connected in the forward direction, the second MOS transistor T2 is turned on, and the signal flows out from the second MOS transistor T2 to the current limiting driver module 200; when the collision signal is connected in the reverse direction, the first MOS transistor T1 is turned on, and the signal flows out from the first MOS transistor T1 to the current limiting driver module 200; the diode is used to provide voltage limiting protection for the corresponding MOS transistor.

[0060] Furthermore, the current limiting driving 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:

[0061] 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 electrode of the anti-reverse connection module 100, the second end of the sixth resistor R6 is further grounded via the seventh resistor R7, and the base of the first transistor Q1 is further grounded via 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 respectively via the ninth resistor R9;

[0062] The emitter of the second triode Q2 is connected to the positive electrode of the anti-reverse connection module 100, and the emitter of the second triode Q2 is also connected to the base of the second triode Q2 through the tenth resistor R10. The base of the second triode Q2 is connected to the base of the third triode Q3 through the eleventh resistor R11. The base of the second triode Q2 is also connected to the collector of the third triode Q3. The collector of the third triode Q3 is grounded through the twelfth resistor R12. The collector of the third diode D3 is also connected to the first side of the isolation driving module 300.

[0063] In this embodiment, the first transistor Q1 is of NPN type, and the second transistor Q2 and the third transistor Q3 are of PNP type.

[0064] When the reverse connection protection circuit does not output a voltage, the first transistor Q1 is turned off, so the third transistor Q3 is turned off, and so the second transistor Q2 is turned off;

[0065] When the anti-reverse connection circuit outputs a voltage, the first transistor Q1 is turned on, so 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 anti-reverse connection circuit is output to the first side of the isolation driving 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 the ground through the second transistor Q2, the ninth resistor R9, and the first transistor Q1, thereby realizing current limiting protection of the circuit; the preset current value can be set by adjusting the resistance value of the tenth resistor R10.

[0066] Furthermore, the isolation driver module 300 includes an optical coupler U1; wherein:

[0067] The positive electrode of the optocoupler U1 is connected to the current limiting driving module 200 , the negative electrode of the optocoupler U1 is grounded, the collector of the optocoupler U1 is connected to the input end of the signal output module, and the emitter of the optocoupler U1 is grounded.

[0068] When the current limiting driving module 200 does not output voltage, the light emitting diode on the first side of the optocoupler U1 is turned off, and the second side of the optocoupler U1 is not conducting;

[0069] When the current limiting driving module 200 outputs voltage, the light emitting diode on the first side of the optocoupler U1 is turned on, the second side of the optocoupler U1 is turned on, and the input end of the signal output module is grounded.

[0070] Furthermore, the signal output module includes a trigger time configuration unit 410, a signal latch unit 420 and a power supply maintaining unit 430; the input end of the trigger time configuration unit 410 is connected to the second side of the isolation driving module 300, the output end of the trigger time configuration unit 410 is connected to the signal latch unit 420, the power supply end of the trigger time configuration unit 410 and the power supply end of the signal latch unit 420 are connected to the power supply maintaining unit 430, and the trigger time configuration unit 410 outputs a signal when the signal it receives is greater than a preset value and the duration exceeds a specified time.

[0071] The trigger time configuration unit 410 is used to set the detection sensitivity; it is understandable that in actual applications, due to interference such as application environment or device error, the collision signal may be falsely triggered.

[0072] Therefore, in order to avoid this problem, a trigger event configuration module is set in this embodiment. Only when the trigger collision signal reaches a preset duration, the signal is transmitted to the rear circuit to generate a driving signal, thereby avoiding interference and improving the accuracy of collision signal detection.

[0073] The signal latch unit 420 is used to convert the signal output by the trigger event configuration module into a driving signal output.

[0074] The power maintenance unit 430 is used to maintain power to the circuit when the power supply is disconnected; it is understandable that when a trigger event occurs, it may cause the circuit or some components to be broken, and this is exactly the scenario where collision signal detection is required. Therefore, in order to ensure power supply in this scenario, a power maintenance unit 430 is set in this embodiment, so that when the power supply is disconnected, it can still be used for the detection circuit to ensure the detection of collision signals.

[0075] Furthermore, the trigger time 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:

[0076] The base of the fourth transistor Q4 is connected to the second side of the isolation driving module 300 through the thirteenth resistor R13, and 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, and 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 end of the comparator U2 through the sixteenth resistor R16. The input end of the comparator U2 is also grounded through the fifth capacitor C5. The power supply end of the comparator U2 is connected to the power supply holding unit 430, and the output end of the comparator U2 is connected to the signal latch unit 420.

[0077] The fourteenth resistor R14 is a pull-up resistor of the fourth transistor Q4 . In this embodiment, the fourth transistor Q4 is a PNP transistor.

[0078] When the isolation drive circuit is turned on, the base of the fourth transistor Q4 is at a low level, the fourth switch tube is turned on, and the voltage output by the power supply holding unit 430 charges the fifth capacitor C5 through the fourth switch tube 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.

[0079] 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 taken for the fifth capacitor C5 to charge to the preset voltage of the comparator U2.

[0080] When instantaneous interference occurs, the presence of the fifth capacitor C5 will not trigger the signal output of the comparator U2, thereby avoiding false touches caused by interference.

[0081] The specific structure and preset voltage of the comparator U2 can be set based on actual needs. Preferably, an LM2903Q comparator can be used and connected to the circuit of this application using the recommended connection method of the comparator.

[0082] Furthermore, the signal latch unit 420 includes a trigger U3; wherein:

[0083] 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;

[0084] The output end of the trigger U3 is used to output a collision driving signal.

[0085] The trigger U3 outputs a driving signal when receiving the signal output by the trigger time configuration unit 410 .

[0086] The type and structure of the specific trigger U3 can be set based on actual needs. Preferably, a 74LVC1G175GV-Q100H trigger can be used, and the trigger is connected to the circuit of this application using the connection method recommended by the manufacturer.

[0087] Furthermore, the power supply holding unit 430 includes an anti-reverse filter unit U4, a voltage regulator U5 and a sixth capacitor C6; wherein:

[0088] The input end of the anti-reverse filtering unit is connected to the power supply, the output end of the anti-reverse filtering unit is grounded through the sixth capacitor C6, the output end of the anti-reverse filtering unit is connected to the input end of the voltage regulator U5, the first output end of the voltage regulator U5 is connected to the power supply end of the trigger time configuration unit 410, and the second output end of the voltage regulator U5 is connected to the power supply end of the signal latch unit 420.

[0089] The anti-reverse filtering unit is used to filter the voltage input by the power supply; at the same time, the reverse connection of the power supply can be avoided by setting an anti-reverse structure. The specific structure can be set based on actual needs. Preferably, the anti-reverse connection module uses a 1N4007 diode.

[0090] The sixth capacitor C6 is used to maintain the power supply. It is understandable that the capacitor voltage cannot change suddenly. 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 slowly decrease and can still supply power to subsequent circuits for a period of time.

[0091] The voltage regulator U5 is used to stabilize the voltage and convert it into the required voltage value to output to the trigger time configuration unit 410 and the signal latch unit 420. The specific type of the voltage regulator U5 can be set based on actual needs. Preferably, the voltage regulator adopts LN20342Q1LDO, which is connected to the circuit of this application using its recommended connection method.

[0092] The present utility model also protects a collision signal detection device, comprising a housing and a collision signal detection circuit disposed within the housing. The structure of the collision signal detection circuit can be referred to in the above-described embodiment and will not be further described here. As such, because the collision signal detection device of this embodiment utilizes the technical solution of the above-described collision signal detection circuit, the collision signal detection device possesses all the beneficial effects of the above-described collision signal detection circuit.

[0093] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or system comprising the element. The serial numbers of the above-mentioned embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A collision signal detection circuit, characterized in that: The collision signal detection circuit includes an anti-reverse connection module, a current limiting drive module, an isolation drive module and a signal output module; the anti-reverse connection module is used to connect to the circuit to be tested, the output end of the anti-reverse connection 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, the anti-reverse connection module is used to generate a collision detection signal whose current flow direction is adapted to the current limiting drive module according to the flow direction of the current in the circuit to be tested, the current limiting drive module is used to limit the current of the collision detection signal, and the isolation drive module is used to isolate the collision detection signal to improve the anti-interference performance of the collision detection signal.

2. The collision signal detection circuit according to claim 1, wherein: The anti-reverse connection module includes a first input terminal and a second input terminal, wherein the first input terminal and the second input terminal are used to connect to the circuit to be tested, and the collision signal detection circuit also includes a first resistor, wherein: The first end of the first resistor is connected to the first input end of the anti-reverse connection module; The second end of the first resistor is connected to the second input end of the reverse connection prevention module.

3. The collision signal detection circuit according to claim 1, wherein: It also includes an electrostatic protection circuit, which includes a first capacitor, a second capacitor, a third capacitor, a first bidirectional voltage regulator, and a second bidirectional voltage regulator; wherein: The first end of the first capacitor is used to connect to the positive input terminal of the circuit to be tested, the first end of the second capacitor is used to connect to the negative input terminal of the circuit to be tested, the second end of the first capacitor is electrically connected to the second end of the second capacitor, the first bidirectional voltage regulator is connected in parallel with the first capacitor, the second bidirectional voltage regulator is connected in parallel with the second capacitor, the second end of the first capacitor is also connected to the floating ground, and the third capacitor is connected between the floating ground and the ground.

4. The collision signal detection circuit according to claim 1, wherein: The anti-reverse connection module includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, 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 MOS transistor is connected to the first input terminal of the collision signal detection circuit through the second resistor, the gate of the first MOS transistor is also connected to the anode of the first diode, the cathode of the first diode is connected to the positive output terminal of the current limiting driving module, the source of the first MOS transistor is connected to the positive output terminal of the current limiting driving module, and the drain of the first MOS transistor is connected to the negative input terminal of the collision signal detection circuit; The gate of the second MOS transistor is connected to the second input terminal of the collision signal detection circuit through the third resistor, the gate of the second MOS transistor is also connected to the anode of the second diode, the cathode of the second diode is connected to the positive output terminal of the current limiting driving module, the source of the second MOS transistor is connected to the positive output terminal of the current limiting driving module, and the drain of the second MOS transistor is connected to the positive input terminal of the collision signal detection circuit; The gate of the third MOS transistor is connected to the first input terminal of the collision signal detection circuit through the fourth resistor, the gate of the third MOS transistor is also connected to the cathode of the third diode, the anode of the third diode is connected to the cathode output terminal of the current limiting driving module, the cathode output terminal of the current limiting driving module is grounded, the drain of the third MOS transistor is grounded, and the source of the third MOS transistor is connected to the cathode input terminal of the circuit to be tested; The gate of the fourth MOS transistor is connected to the second input terminal of the collision signal detection circuit through the fifth resistor. The gate of the fourth MOS transistor is also connected to the cathode of the fourth diode. The anode of the fourth diode is grounded. The drain of the fourth MOS transistor is grounded. The source of the fourth MOS transistor is connected to the positive input terminal of the collision signal detection circuit.

5. The collision signal detection circuit according to claim 1, wherein: The current limiting driving 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 end of the current limiting driving module, the second end of the sixth resistor is connected to the negative input end of the current limiting driving module through the seventh resistor, the negative input end of the current limiting driving module is grounded, 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 respectively through the ninth resistor; The emitter of the second triode is connected to the positive input terminal of the current limiting driving module, the emitter of the second triode is also connected to the base of the second triode through the tenth resistor, the base of the second triode is connected to the collector of the third triode through the eleventh resistor, the base of the second triode is also connected to the emitter of the third triode, and the collector of the third triode is grounded through the twelfth resistor.

6. The collision signal detection circuit according to claim 1, wherein: The isolation driving module includes an optical coupler; wherein: The positive electrode of the optocoupler is connected to the current limiting driving module, the negative electrode of the optocoupler is grounded, the collector of the optocoupler is connected to the input end of the signal output module, and the emitter of the optocoupler is grounded.

7. The collision signal detection circuit according to 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 end of the trigger time configuration unit is connected to the second side of the isolation driving module, the output end of the trigger time configuration unit is connected to the signal latch unit, the power supply end of the trigger time configuration unit and the power supply end of the signal latch unit are connected to the power supply holding unit, and the trigger time configuration unit outputs a signal when the signal it receives is greater than a preset value and the duration exceeds a specified time.

8. The collision signal detection circuit according to 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 second side of the isolation driving 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 end of the comparator through the sixteenth resistor, the input end of the comparator is also grounded through the fifth capacitor, the power supply end of the comparator is connected to the power supply holding unit, and the output end of the comparator is connected to the signal latch unit.

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

10. A collision signal detection device, characterized in that: The collision signal detection device includes a housing and a collision signal detection circuit according to any one of claims 1 to 9, wherein the collision signal detection circuit is disposed in the housing.

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