Resistance self-checking system and method for initiating explosive device

Abstract

The application discloses a kind of pyrotechnics resistance self-checking system and method, including initiation power supply, control module, pyrotechnics resistance detection branch, pyrotechnics working branch, main pyrotechnics and spare pyrotechnics, when receiving first resistance detection signal, pyrotechnics resistance detection branch turns on first detection loop;When main pyrotechnics in first detection loop does not pass resistance detection, control module sends second resistance detection signal;Pyrotechnics resistance detection branch turns on second detection loop according to second resistance detection signal;Control module carries out resistance detection to spare pyrotechnics in second detection loop, when spare pyrotechnics passes resistance detection, output initiation control signal to pyrotechnics working branch;Pyrotechnics working branch turns on working loop according to initiation control signal, and spare pyrotechnics is detonated by initiation power supply driving.It can automatically connect spare pyrotechnics when main pyrotechnics appears abnormal, improve the maintenance efficiency of abnormal pyrotechnics while improving the safety of pyrotechnics.

Description

Technical Field

[0001] This invention relates to the field of pyrotechnics testing technology, and in particular to a pyrotechnics resistance self-testing system and method. Background Technology

[0002] In the quality inspection of pyrotechnics, it is necessary to test the resistance of the pyrotechnics. There are many types of pyrotechnics, and the resistance range of different types of pyrotechnics varies greatly. The existing method for measuring the resistance of pyrotechnics generally involves designing a test and protection circuit inside the pyrotechnic. However, this method can only complete the testing and protection of the resistance of the pyrotechnic. If the resistance test of the pyrotechnic does not meet the requirements, the pyrotechnic needs to be replaced manually, which is inefficient.

[0003] There is a need to find a method that can automatically detect the resistance of pyrotechnic devices and automatically switch to a backup pyrotechnic device if the detection fails. At the same time, the method should also be able to avoid accidentally entering the self-test mode and avoid misusing unqualified pyrotechnic devices, thereby improving the efficiency of pyrotechnic device resistance detection and replacement, and ensuring the safety of automatic pyrotechnic device replacement. Summary of the Invention

[0004] The main objective of this invention is to provide a self-testing system and method for the resistance of pyrotechnics, aiming to solve the technical problem of low maintenance efficiency in the prior art, which involves testing the resistance of pyrotechnics through a protection circuit and requiring manual replacement of the defective pyrotechnics when the resistance test fails to meet the requirements.

[0005] To achieve the above objectives, the present invention provides a pyrotechnic resistance self-testing system, the system comprising an initiation power supply, a control module, a pyrotechnic resistance detection branch, a pyrotechnic working branch, a main pyrotechnic, and a backup pyrotechnic; the pyrotechnic resistance detection branch and the pyrotechnic working branch are both connected to the control module;

[0006] The pyrotechnic resistance detection branch is used to connect the first detection circuit between the detonating power source and the main pyrotechnic when the first resistance detection signal sent by the control module is received.

[0007] The control module is also used to perform resistance detection on the main pyrotechnic component when the first detection circuit is turned on, and to send a second resistance detection signal when the main pyrotechnic component fails the resistance detection.

[0008] The pyrotechnic resistance detection branch is also used to connect the second detection circuit between the detonating power source and the prepared pyrotechnic when the second resistance detection signal is received.

[0009] The control module is also used to perform resistance detection on the standby pyrotechnic device when the second detection circuit is turned on, and to output an initiation control signal to the working branch of the pyrotechnic device when the standby pyrotechnic device passes the resistance detection.

[0010] The working branch of the pyrotechnic device is used to connect the working circuit between the initiation power supply and the standby pyrotechnic device when the main pyrotechnic device fails to pass the resistance detection and receives the initiation control signal, so as to drive the standby pyrotechnic device to detonate through the initiation power supply.

[0011] Optionally, the system further includes a signal output module and an enable module. The input terminal of the signal output module is connected to the output terminal of the control module, the output terminal of the signal output module is connected to the pyrotechnic resistance detection branch and the pyrotechnic working branch, and the enable terminal of the signal output module is connected to the output terminal of the enable module.

[0012] The control module is also used to output control signals to the signal output module, the control signals including a first resistance detection signal, a second resistance detection signal and a detonation control signal;

[0013] The enabling module is used to acquire the system power-on duration when the detection system is powered on, and output an enabling signal to the signal output module according to the system power-on duration and a preset duration threshold.

[0014] The signal output module is used to output the control signal to the pyrotechnic resistance detection branch or the pyrotechnic working branch when the enable signal is a valid enable signal.

[0015] Optionally, the pyrotechnic resistance detection branch is further configured to, upon receiving the first resistance detection signal, connect the first detection circuit between the detonating power supply, the constant current source, and the main pyrotechnic, and supply power to the main pyrotechnic through the constant current source; and

[0016] The pyrotechnic resistance detection branch is also used to connect the second detection circuit between the detonation power supply, the constant current source and the standby pyrotechnic when the second resistance detection signal is received, and to supply power to the standby pyrotechnic through the constant current source.

[0017] Optionally, the system further includes a branch switching switch, wherein the pyrotechnic resistance detection branch includes a constant current source, a first switch, and a second switch;

[0018] The output terminal of the detonating power supply is connected to the first terminal of the branch switching switch; the input terminal of the constant current source is connected to the second terminal of the branch switching switch; the output terminal of the constant current source is connected to the first terminal of the main pyrotechnic device; the second terminal of the main pyrotechnic device is connected to the first terminal of the first switch; and the second terminal of the first switch is grounded. The first terminal of the backup pyrotechnic device is connected to the output terminal of the constant current source; the second terminal of the backup pyrotechnic device is connected to the first terminal of the second switch; and the second terminal of the second switch is grounded. The third terminal of the branch switching switch is connected to the input terminal of the working branch of the pyrotechnic device; and the output terminal of the working branch of the pyrotechnic device is connected to the first terminals of both the main pyrotechnic device and the backup pyrotechnic device.

[0019] Furthermore, to achieve the above objectives, the present invention also proposes a method for self-testing the resistance of pyrotechnic products, the method comprising:

[0020] When the system is detected to be powered on, the first detection circuit between the detonation power supply and the main pyrotechnic device is turned on, and the resistance of the main pyrotechnic device is detected.

[0021] When the main pyrotechnic device fails the resistance test, the second detection circuit between the initiation power supply and the standby pyrotechnic device is activated, and the standby pyrotechnic device is subjected to resistance testing.

[0022] When the ignition device passes the resistance detection, the working circuit between the detonating power supply and the ignition device is controlled to be connected, so that the detonating power supply can drive the ignition device to detonate through the working circuit.

[0023] Optionally, the step of controlling the first detection circuit between the detonating power supply and the main pyrotechnic device to be turned on when the system is detected to be powered on, and performing resistance detection on the main pyrotechnic device, includes:

[0024] When the system is detected to be powered on, the control branch switching switch connects the detonation power supply to the pyrotechnic resistance detection branch.

[0025] The first switch in the pyrotechnic resistance detection branch is closed to activate the first detection circuit between the detonating power source and the main pyrotechnic.

[0026] The output current of the detonation power supply is converted into a preset current by a constant current source to supply power to the main pyrotechnic device, and the differential pressure of the main pyrotechnic device is sampled to obtain the differential pressure of the main pyrotechnic device.

[0027] The resistance of the main ignition device is detected based on the pressure difference of the main ignition device and the preset current.

[0028] Optionally, the step of controlling the second detection circuit between the initiation power supply and the standby ignition device to be turned on when the main ignition device fails the resistance test, and performing resistance testing on the standby ignition device, includes:

[0029] When the main pyrotechnic component fails the resistance test, the first switch is controlled to open to cut off the first detection circuit;

[0030] The second switch in the pyrotechnic resistance detection branch is closed to connect the second detection circuit between the detonating power supply and the standby pyrotechnic.

[0031] The output current of the detonating power supply is converted into a preset current by a constant current source to supply power to the standby ignition device, and the pressure difference of the standby ignition device is sampled to obtain the pressure difference of the standby ignition device.

[0032] The resistance of the ignition device is detected based on the preset current and the voltage difference of the ignition device.

[0033] Optionally, the step of controlling the working circuit between the initiating power supply and the prepared ignition device to be connected when the prepared ignition device passes the resistance detection, so as to drive the prepared ignition device to detonate through the initiating power supply, includes:

[0034] When the standby ignition device passes the resistance detection, the control branch switching switch is disconnected from the ignition device detection branch, and the control branch switching switch is connected to the ignition device working branch to conduct the working circuit between the detonation power supply and the standby ignition device.

[0035] The detonating power source and the working circuit drive the preparation ignition device to detonate.

[0036] Optionally, the step of controlling the first detection circuit between the detonating power supply and the main pyrotechnic device to be turned on when the system is detected to be powered on, and performing resistance detection on the main pyrotechnic device, further includes:

[0037] When the system is powered on, a first resistance detection signal is output to the signal output module. The signal output module is used to be in working state when it receives a valid enable signal output by the enable module.

[0038] The first resistance detection signal is output to the pyrotechnic resistance detection branch through the signal output module in operation, so as to connect the first detection circuit between the detonation power supply and the main pyrotechnic.

[0039] When the first detection circuit is turned on, the resistance of the main pyrotechnic device is detected.

[0040] Optionally, the enabling module is configured to acquire the system power-on duration when the system is powered on, and output a valid enabling signal when the power-on duration is less than a preset duration threshold; and

[0041] When the power-on duration is greater than or equal to the preset duration threshold, an invalid enable signal is output.

[0042] This invention proposes a pyrotechnic resistance self-testing system. The system includes: an initiating power source, a control module, a pyrotechnic resistance detection branch, a pyrotechnic working branch, a main pyrotechnic, and a backup pyrotechnic. Both the pyrotechnic resistance detection branch and the pyrotechnic working branch are connected to the control module. The pyrotechnic resistance detection branch is used to connect a first detection circuit between the initiating power source and the main pyrotechnic when it receives a first resistance detection signal sent by the control module. The control module is further used to perform resistance detection on the main pyrotechnic when the first detection circuit is connected, and to send a second resistance signal when the main pyrotechnic fails the resistance detection. The detection signal; the pyrotechnic resistance detection branch is further configured to, upon receiving the second resistance detection signal, activate the second detection circuit between the detonating power supply and the standby pyrotechnic; the control module is further configured to, when the second detection circuit is activated, perform resistance detection on the standby pyrotechnic, and when the standby pyrotechnic passes the resistance detection, output an ignition control signal to the pyrotechnic working branch; the pyrotechnic working branch is configured to, when the main pyrotechnic fails the resistance detection and receives the ignition control signal, activate the working circuit between the detonating power supply and the standby pyrotechnic, so as to drive the standby pyrotechnic to detonate through the detonating power supply. The pyrotechnic resistance self-testing system proposed in this invention ensures that the resistance of the pyrotechnic is automatically tested before each use, avoiding errors and omissions during manual operation. The system is equipped with a main ignition device and a backup ignition device. When the system is powered on, it enters a ignition device self-test mode. First, it performs a resistance test on the main ignition device. If an abnormal resistance value is detected in the main ignition device, it automatically performs a resistance test on the backup ignition device. When the backup ignition device passes the resistance test, it is controlled to connect to the working circuit, and the main ignition device is driven to detonate by the initiating power supply. There is no need to manually set the detection mode before the detection begins. Moreover, the addition of a backup ignition device in the hardware can promptly connect the backup ignition device when the resistance value of the main ignition device is abnormal. When the resistance of the ignition device is found to be unqualified, there is no need to manually replace the ignition device; it automatically switches to the backup ignition device. This improves the safety of the ignition devices and the efficiency of repairing abnormal ignition devices. Attached Figure Description

[0043] Figure 1 This is a system structure block diagram of the first embodiment of the pyrotechnic resistance self-testing system of the present invention;

[0044] Figure 2 This is a system structure block diagram of the second embodiment of the pyrotechnic resistance self-testing system of the present invention;

[0045] Figure 3 This is a schematic diagram of the circuit structure in one embodiment of the pyrotechnic resistance self-testing system of the present invention;

[0046] Figure 4This is a flowchart illustrating the first embodiment of the self-test method for the resistance of pyrotechnic products according to the present invention.

[0047] Figure 5 This is a schematic diagram illustrating the detection of the resistance of a pyrotechnic item in one embodiment of the self-testing method for the resistance of pyrotechnic items according to the present invention.

[0048] Explanation of icon numbers:

[0049] 10 Detonation power supply 20 Control module 30 Pyrotechnic resistance detection branch 40 Explosives working branch 50 Signal output module 60 Enable module 301 constant current source S1 Branch switching switch A Main fire-making equipment B Fire-prepared equipment Q1 First switch Q2 Second switch

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0052] This invention provides a self-testing system for the resistance of pyrotechnic components, referring to... Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the pyrotechnic resistance self-testing system of the present invention.

[0053] In this embodiment, the system includes an initiation power supply 10, a control module 20, a pyrotechnic resistance detection branch 30, a pyrotechnic working branch 40, a main pyrotechnic A, and a backup pyrotechnic B. The pyrotechnic resistance detection branch 30 and the pyrotechnic working branch 40 are both connected to the control module 20.

[0054] Understandably, the initiating power supply can be a constant voltage source that provides the working current for the pyrotechnic device to detonate; the control module can be a module that controls the resistance detection and operation of the pyrotechnic device, and can control the switching between the resistance detection branch and the working branch, the conduction of the detection circuit and the working circuit, and the calculation of the resistance value of the pyrotechnic device. For example, the control module can be a processor, MCU, FPGA, or other programmable control device; the resistance detection branch can be a branch that needs to be turned on during the resistance detection process of the pyrotechnic device, and the resistance detection branch is equipped with a main pyrotechnic device and a backup pyrotechnic device; the working branch can be a branch that needs to be turned on during the operation of the pyrotechnic device.

[0055] The pyrotechnic resistance detection branch 30 is used to connect the first detection circuit between the detonating power supply 10 and the main pyrotechnic A when the first resistance detection signal sent by the control module 20 is received.

[0056] It is understandable that when the system is powered on, the control module sends a first resistance detection signal to the pyrotechnic resistance detection branch; the first resistance detection signal can be a signal that controls the conduction of the first detection circuit where the main pyrotechnic is located; in order to ensure the safety of the resistance detection of the main pyrotechnic, devices such as voltage divider resistors and constant current sources can be set in the first detection circuit to convert the output current of the detonation power supply into a preset current before powering the main pyrotechnic.

[0057] The control module 20 is further configured to perform resistance detection on the main pyrotechnic component A when the first detection circuit is on, and to send a second resistance detection signal when the main pyrotechnic component A fails the resistance detection.

[0058] It is understandable that resistance detection of the main ignition device can be performed by sampling the voltage of the main ignition device, determining the detection resistance of the main ignition device based on the sampled voltage and the current flowing through the main ignition device, and determining that the main ignition device has failed the resistance detection when the resistance difference between the detection resistance of the main ignition device and the preset resistance is greater than the preset resistance threshold; the second resistance detection signal can be a signal that controls the second detection circuit where the backup ignition device is located to be turned on.

[0059] The pyrotechnic resistance detection branch 30 is also used to connect the second detection circuit between the detonating power supply 10 and the standby pyrotechnic B when the second resistance detection signal is received.

[0060] Understandably, in order to ensure the safety of the resistance detection of the backup ignition device, devices such as voltage divider resistors and constant current sources can be set in the second detection circuit to convert the output current of the detonation power supply into a preset current before supplying power to the backup ignition device.

[0061] The control module 20 is also used to perform resistance detection on the standby pyrotechnic item B when the second detection circuit is turned on, and to output an initiation control signal to the pyrotechnic item working branch 40 when the standby pyrotechnic item B passes the resistance detection.

[0062] It is understandable that the detonation control signal can be a signal that controls the working branch of the pyrotechnic device to conduct the working circuit of the pyrotechnic device; when the standby pyrotechnic device passes the resistance detection, the control module also controls the resistance detection branch of the pyrotechnic device to disconnect from the detonation power supply, thereby terminating the resistance detection of the pyrotechnic device.

[0063] The working branch circuit 40 of the pyrotechnics is used to connect the working circuit between the initiation power supply 10 and the standby pyrotechnics B when the main pyrotechnics A fails the resistance detection and receives the initiation control signal, so as to drive the standby pyrotechnics B to detonate through the initiation power supply 10.

[0064] Understandably, the main ignition device and the backup ignition device are primarily used for detonation. Normally, only the main ignition device needs to be detonated. If the main ignition device passes the resistance detection, it will be driven to detonate. If the main ignition device fails the resistance detection, but the backup ignition device passes, the backup ignition device will be used for detonation. If neither the main ignition device nor the backup ignition device passes the resistance detection, the detonation process will be terminated, and a fault message will be output.

[0065] It should be noted that existing methods for self-testing the resistance of pyrotechnics generally use a dedicated testing instrument or incorporate a test protection circuit within the pyrotechnic. This method involves multiple instruments, complex procedures, and inherent safety risks. If the instrument or test setting is incompatible with the type of pyrotechnic being tested, the test current may exceed specified requirements, leading to safety hazards. Using an internal test protection circuit to detect resistance only performs the resistance test; if an abnormal resistance value is detected, manual replacement and repair are required, resulting in low efficiency in troubleshooting abnormal pyrotechnics. The self-testing method for pyrotechnic resistance proposed in this embodiment... The inspection system is equipped with a main pyrotechnic device and a backup pyrotechnic device. When the system is powered on, it automatically enters the pyrotechnic device self-inspection mode. First, it performs resistance detection on the main pyrotechnic device. If an abnormal resistance is detected in the main pyrotechnic device, it automatically performs resistance detection on the backup pyrotechnic device. If the backup pyrotechnic device passes the resistance detection, it is automatically connected to the working circuit and detonated by the detonating power supply. This achieves automatic power-on detection of pyrotechnic device resistance. Moreover, when the resistance of the main pyrotechnic device is abnormal, the system can automatically switch to the backup pyrotechnic device, eliminating the need for manual replacement and maintenance of the main pyrotechnic device. This avoids the problems of incorrect and missed detections that are prone to occur during manual operation, improving both the safety of pyrotechnic device resistance detection and the efficiency of pyrotechnic device inspection.

[0066] In practical implementation, for example, when the control module powers on the system, it outputs a first resistance detection signal. The pyrotechnic resistance detection branch, based on this signal, activates the first detection circuit between the detonating power supply and the main pyrotechnic. A constant current source in the first detection circuit converts the output current of the detonating power supply into a preset current and outputs it to the main pyrotechnic. The control module samples the voltage of the main pyrotechnic and calculates its resistance based on the sampled voltage and the preset current. If the resistance of the main pyrotechnic does not meet the requirements, it outputs a second resistance detection signal. The pyrotechnic resistance detection branch, based on this second signal, disconnects the first detection circuit and activates the detonation circuit. The second detection circuit between the power supply and the standby ignition device involves the control module performing resistance detection on the standby ignition device. When the standby ignition device passes the resistance detection, it outputs an initiation control signal. The ignition device's working branch then connects the working circuit between the initiation power supply and the standby ignition device according to the initiation control signal and disconnects the connection between the ignition device's resistance detection branch and the initiation power supply. Using the working circuit, the initiation power supply drives the standby ignition device to detonate. If the main ignition device fails the resistance detection, the control module also outputs a main ignition device fault information. If both the main ignition device and the standby ignition device fail the resistance detection, the detonation process is terminated, and fault information for both the main ignition device and the standby ignition device is output.

[0067] This embodiment proposes a pyrotechnic resistance self-testing system. The system includes: an initiating power supply, a control module, a pyrotechnic resistance detection branch, and a pyrotechnic working branch. Both the pyrotechnic resistance detection branch and the pyrotechnic working branch are connected to the control module. The pyrotechnic resistance detection branch is used to connect a first detection circuit between the initiating power supply and the main pyrotechnic when it receives a first resistance detection signal sent by the control module. The control module is further used to perform resistance detection on the main pyrotechnic when the first detection circuit is connected, and to send a second resistance detection signal when the main pyrotechnic fails the resistance detection. The pyrotechnic resistance detection branch is further configured to activate the second detection circuit between the initiating power supply and the standby pyrotechnic when the second resistance detection signal is received. The control module is further configured to perform resistance detection on the standby pyrotechnic when the second detection circuit is activated, and to output an initiation control signal to the pyrotechnic working branch when the standby pyrotechnic passes the resistance detection. The pyrotechnic working branch is configured to activate the working circuit between the initiating power supply and the standby pyrotechnic when the main pyrotechnic fails the resistance detection and receives the initiation control signal, so as to drive the standby pyrotechnic to detonate via the initiating power supply. The pyrotechnic resistance self-testing system proposed in this invention ensures that the resistance of the pyrotechnic is automatically tested before each use, avoiding errors and omissions during manual operation. The system is equipped with a main ignition device and a backup ignition device. When the system is powered on, it enters a ignition device self-test mode. First, it performs a resistance test on the main ignition device. If an abnormal resistance value is detected in the main ignition device, it automatically performs a resistance test on the backup ignition device. When the backup ignition device passes the resistance test, it is controlled to connect to the working circuit, and the main ignition device is driven to detonate by the initiating power supply. There is no need to manually set the detection mode before the detection begins. Moreover, the addition of a backup ignition device in the hardware can promptly connect the backup ignition device when the resistance value of the main ignition device is abnormal. When the resistance of the ignition device is found to be unqualified, there is no need to manually replace the ignition device; it automatically switches to the backup ignition device. This improves the safety of the ignition devices and the efficiency of repairing abnormal ignition devices.

[0068] Reference Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the pyrotechnic resistance self-testing system of the present invention.

[0069] Based on the first embodiment described above, the system in this embodiment further includes a signal output module 50 and an enable module 60. The input terminal of the signal output module 40 is connected to the output terminal of the control module 20, the output terminal of the signal output module 50 is connected to the pyrotechnic resistance detection branch 30 and the pyrotechnic working branch 40, and the enable terminal of the signal output module 50 is connected to the output terminal of the enable module 60.

[0070] The control module 20 is also used to output a control signal to the signal output module 50, the control signal including a first resistance detection signal, a second resistance detection signal and a detonation control signal;

[0071] The enabling module 60 is used to acquire the system power-on duration when the detection system is powered on, and output an enabling signal to the signal output module 50 according to the system power-on duration and a preset duration threshold.

[0072] The signal output module 50 is used to output the control signal to the pyrotechnic resistance detection branch 30 or the pyrotechnic working branch 40 when the enable signal is a valid enable signal.

[0073] It should be noted that interference may occur during system operation, causing the control module to issue incorrect control signals. For example, the main pyrotechnic device may fail the resistance test, while the backup pyrotechnic device may pass the resistance test. After the backup pyrotechnic device is connected to the working circuit, external interference may cause the control module to mistakenly switch the backup pyrotechnic device connected to the working circuit to the main pyrotechnic device, resulting in the detonation of the unqualified pyrotechnic device. Alternatively, after the resistance test of the pyrotechnic device is completed, the resistance test branch of the pyrotechnic device may be connected to the detonation power supply. To avoid the control module being mistriggered due to interference, this embodiment adds a signal output module and an enable module to improve the safety of pyrotechnic device resistance detection and detonation control.

[0074] In this embodiment, the control module first outputs the control signal to the signal output module, and then the signal output module outputs the control signal to the pyrotechnic resistance detection branch or the pyrotechnic working branch. The signal output module is in working state when the enable signal is a valid enable signal, and in offline state when the enable signal is an invalid enable signal. The signal output module can only output signals when it is in working state. For example, the enable module is a processor, MCU, FPGA, timer or other programmable control device with timing function.

[0075] Understandably, the preset duration threshold can be the maximum time required to complete the resistance detection and detonation control of the pyrotechnic device, and the preset duration threshold can be calibrated in advance. When the enable signal is a valid enable signal, the signal output module will receive and output a control signal; when the enable signal is an invalid enable signal, the signal output module will not output a control signal.

[0076] Furthermore, since a large current is required to detonate the pyrotechnic device, in order to prevent the device from detonating during the resistance detection process, the pyrotechnic device resistance detection branch 30 is also used to connect the first detection circuit between the detonating power supply 10, the constant current source 301, and the main pyrotechnic device when the first resistance detection signal is received, and to supply power to the main pyrotechnic device through the constant current source 301; and the pyrotechnic device resistance detection branch 30 is also used to connect the second detection circuit between the detonating power supply 10, the constant current source 301, and the backup pyrotechnic device when the second resistance detection signal is received, and to supply power to the backup pyrotechnic device through the constant current source 10.

[0077] In this embodiment, a constant current source is used to convert the output current of the detonating power supply into a preset current to power the pyrotechnic device. The preset current is less than the output current. This prevents the pyrotechnic device from being accidentally triggered during resistance detection. Furthermore, converting the output current into a constant current equal to the preset current improves the accuracy of the pyrotechnic device's resistance calculation.

[0078] Furthermore, to improve the repair efficiency of faulty pyrotechnics while ensuring the safety of resistance detection, the system also includes a branch switching switch S1. The pyrotechnic resistance detection branch 30 includes a constant current source 301, a main pyrotechnic A, a backup pyrotechnic B, a first switch Q1, and a second switch Q2. The output terminal of the detonating power supply 10 is connected to the first terminal of the branch switching switch S1, the input terminal of the constant current source 301 is connected to the second terminal of the branch switching switch S1, and the output terminal of the constant current source 301 is connected to the first terminal of the main pyrotechnic A. The main pyrotechnic device A is connected to the first terminal of the first switch Q1, and the second terminal of the first switch Q1 is grounded; the first terminal of the backup pyrotechnic device B is connected to the output terminal of the constant current source 301, the second terminal of the backup pyrotechnic device B is connected to the first terminal of the second switch Q2, and the second terminal of the second switch Q2 is grounded; the third terminal of the branch switching switch S1 is connected to the input terminal of the pyrotechnic device working branch 40, and the output terminal of the pyrotechnic device working branch 40 is connected to the first terminals of the main pyrotechnic device A and the backup pyrotechnic device B.

[0079] In this embodiment, the branch switching switch S1 can be a single-pole double-throw relay, a single-pole single-throw relay or other controllable power switching circuit; the first switch Q1 and the second switch Q2 can be power MOSFETs, single-pole single-throw relays or other controllable power switches.

[0080] In specific implementation, refer to Figure 3 , Figure 3This is a circuit diagram of a pyrotechnic resistance self-testing system. For example, branch switching switch S1 is a single-pole double-throw relay, the control module is processor 1, the enable module is processor 2, and the signal output module includes a first AND gate and a second AND gate. When the system is powered on, processor 1 starts timing to obtain the system power-on duration. When the system power-on duration is less than a preset duration threshold, processor 1 outputs a valid enable signal to the first AND gate and the second AND gate. When the system is powered on, processor 2 outputs a first resistance detection signal to the first AND gate and the second AND gate. The first AND gate and the second AND gate output the first resistance detection signal, S1 and the first terminal are closed, Q1 is closed, and Q2 is open, connecting the pyrotechnic resistance detection branch to the detonating power supply. The first detection circuit where the main pyrotechnic A is located is turned on. The output current of the detonating power supply is processed by a constant current source to a preset current and then supplies power to the main pyrotechnic A. Processor 1 performs differential pressure sampling on the main pyrotechnic A to obtain the main pyrotechnic resistance detection signal. The main ignition device's resistance is calculated based on the main ignition device's pressure difference and the preset current. If the main ignition device's resistance does not meet the preset requirements, processor 1 outputs a second resistance detection signal to the first and second AND gates. The first and second AND gates output the second resistance detection signal. S1 remains closed with the first terminal, Q1 is open, and Q2 is closed. Processor 1 performs resistance detection on the backup ignition device. When the backup ignition device passes the resistance detection, it outputs an initiation control signal to the first and second AND gates. The first and second AND gates output the initiation control signal. At this time, S1 is disconnected from the second terminal and closed with the third terminal. Q1 remains open, and Q2 remains closed, thus completing the working circuit. The working circuit is used to drive the backup ignition device to detonate through the initiation power supply. When the system power-on time exceeds the preset time threshold, processor 2 outputs an invalid enable signal to the first and second AND gates. At this time, processor 1 cannot control the devices in the system.

[0081] In this embodiment, the control module outputs control signals to the signal output module. The enable module outputs a valid enable signal to the signal output module when the system power-on time is less than a preset time threshold, and an invalid enable signal to the signal output module when the system power-on time is greater than or equal to the preset time threshold. The signal output module is in an active state when it receives a valid enable signal and in an offline state when it receives an invalid enable signal. This avoids false triggering of the control module due to interference, improving the safety of pyrotechnic resistance detection and detonation control. By setting the enable module, it ensures that the system will not mistakenly enter self-test mode again after entering normal mode; it also ensures that the system will not misuse unqualified pyrotechnics, thus ensuring greater safety when switching operating modes and automatically switching between primary and backup pyrotechnics.

[0082] This invention provides a method for self-testing the resistance of pyrotechnic devices, referring to... Figure 4 , Figure 4 This is a flowchart illustrating the first embodiment of the self-testing method for the resistance of pyrotechnic products according to the present invention.

[0083] In this embodiment, the self-testing method for the resistance of pyrotechnic devices includes the following steps:

[0084] Step S10: When the system is detected to be powered on, the first detection circuit between the detonation power supply and the main pyrotechnic device is turned on, and the resistance of the main pyrotechnic device is detected.

[0085] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device, pyrotechnic resistance detection device, or processor capable of performing the above functions. The following uses a processor as an example to illustrate this embodiment and the subsequent embodiments.

[0086] Step S20: When the main ignition device fails the resistance test, control the second detection circuit between the detonation power supply and the backup ignition device to be turned on, and perform resistance test on the backup ignition device.

[0087] Step S30: When the ignition device passes the resistance detection, control the working circuit between the detonation power supply and the ignition device to be connected, so as to use the detonation power supply to drive the ignition device to detonate through the working circuit.

[0088] In practice, when the processor detects that the system is powered on, it controls the first detection circuit between the initiating power supply and the main ignition device to be turned on. After the first detection circuit is turned on, the main ignition device is subjected to resistance detection. If the main ignition device fails the resistance detection, the processor controls the second detection circuit between the initiating power supply and the backup ignition device to be turned on, and the backup ignition device is subjected to resistance detection. If the backup ignition device passes the resistance detection, the processor controls the working circuit between the initiating power supply and the backup ignition device to be turned on. Using the turned-on working circuit, the initiating power supply drives the backup ignition device to detonate.

[0089] Furthermore, to improve the accuracy of the resistance detection of the main pyrotechnic device, step S10 includes: when the system is detected to be powered on, controlling the branch switching switch to connect the detonating power supply to the pyrotechnic device resistance detection branch; controlling the first switch in the pyrotechnic device resistance detection branch to close, so as to conduct the first detection circuit between the detonating power supply and the main pyrotechnic device; converting the output current of the detonating power supply into a preset current through a constant current source to supply power to the main pyrotechnic device, and sampling the differential pressure of the main pyrotechnic device to obtain the main pyrotechnic device differential pressure; and performing resistance detection on the main pyrotechnic device based on the main pyrotechnic device differential pressure and the preset current.

[0090] In specific implementation, we will continue to refer to Figure 3When the processor detects that the system is powered on, it controls the branch switching switch S1 to close the second terminal to connect the detonating power supply to the pyrotechnic resistance detection branch; it controls the first switch Q1 to close and the second switch Q2 to open to connect the first detection circuit between the detonating power supply and the main pyrotechnic. The output current of the detonating power supply is converted into a preset current through a constant current source, and the differential pressure of the main pyrotechnic is sampled to obtain the differential pressure of the main pyrotechnic. The resistance R1 of the main pyrotechnic is calculated based on the differential pressure of the main pyrotechnic and the preset current. If the resistance value of R1 meets the requirements, it controls the S1 to close the third terminal, controls Q1 to close and Q2 to open to connect the main pyrotechnic to the working circuit, and uses the working circuit to drive the main pyrotechnic to detonate through the detonating power supply.

[0091] Furthermore, to improve the accuracy of resistance detection of the standby pyrotechnic device, step S20 includes: when the main pyrotechnic device fails the resistance detection, controlling the first switch to open to cut off the first detection circuit; controlling the second switch in the resistance detection branch of the pyrotechnic device to close to connect the second detection circuit between the detonating power supply and the standby pyrotechnic device; converting the output current of the detonating power supply into a preset current through a constant current source to supply power to the standby pyrotechnic device, and sampling the differential pressure of the standby pyrotechnic device to obtain the differential pressure of the standby pyrotechnic device; and performing resistance detection on the standby pyrotechnic device based on the preset current and the differential pressure of the standby pyrotechnic device.

[0092] Furthermore, in order to drive the ignition of the compliant pyrotechnic device, step S30 includes: when the standby pyrotechnic device passes the resistance detection, controlling the branch switching switch to disconnect from the pyrotechnic device detection branch, and controlling the branch switching switch to connect to the pyrotechnic device working branch, so as to connect the working circuit between the detonating power supply and the standby pyrotechnic device; driving the standby pyrotechnic device to detonate through the detonating power supply and the working circuit.

[0093] In specific implementation, we will continue to refer to Figure 3 When the main pyrotechnic resistor Q1 does not meet the preset requirements, the processor reports a fault in R1 and controls the first switch Q1 to open and the second switch Q2 to close, thereby connecting the second detection circuit between the detonating power supply and the standby pyrotechnic. The output current of the detonating power supply is converted into a preset current through a constant current source, and the differential pressure of the standby pyrotechnic is sampled to obtain the differential pressure of the standby pyrotechnic. The resistance R2 of the standby pyrotechnic is calculated based on the differential pressure and the preset current. If the resistance of the standby pyrotechnic meets the preset requirements, the processor controls S1 to connect to the third terminal, thereby connecting the working circuit between the detonating power supply and the standby pyrotechnic. The standby pyrotechnic is then detonated by the detonating power supply through the working circuit. If the resistance value of R2 does not meet the requirements, the processor reports a fault in R2 and controls Q1 and Q2 to open.

[0094] Furthermore, to avoid interference with the control module leading to false triggering and to improve the safety of pyrotechnic resistance detection and detonation control, step S10 further includes: when the system is powered on, outputting a first resistance detection signal to a signal output module, wherein the signal output module is in a working state when it receives a valid enable signal output by the enable module; the first resistance detection signal is output to the pyrotechnic resistance detection branch through the signal output module in the working state to conduct the first detection circuit between the detonation power supply and the main pyrotechnic; when the first detection circuit is conducted, resistance detection is performed on the main pyrotechnic.

[0095] Furthermore, to prevent the control module from being mistriggered due to interference, and to improve the safety of pyrotechnic resistance detection and detonation control, the enabling module is used to acquire the system power-on duration when the system is powered on, and output a valid enabling signal when the power-on duration is less than a preset duration threshold; and output an invalid enabling signal when the power-on duration is greater than or equal to the preset duration threshold.

[0096] In specific implementation, refer to Figure 3 and Figure 5 For example, in this embodiment, the execution entity is processor 1, and the enabling module is processor 2. When processor 2 outputs a valid enable signal, processor 1 controls the devices in the system through the isolation control circuit. When performing resistance detection on the main pyrotechnic item, processor 1 outputs a first resistance detection signal through port I03. When the enable signal output by processor 2 is a valid enable signal, S1 connects the detonation power supply to the pyrotechnic item resistance detection branch, Q1 closes, Q2 opens, and the isolation acquisition circuit waits for the first voltage ADC1 and the second voltage ADC2 of the main pyrotechnic item A, calculating the voltage difference between ADC1 and ADC2. The main ignition device's voltage difference is obtained. Based on the main ignition device's voltage difference and the preset current output by the constant current source, the resistance R1 of the main ignition device is calculated. When R1 does not meet the preset requirements, a second resistance detection signal is output. The state of S1 remains unchanged, Q1 is open, and Q2 is closed. The voltage difference between ADC3 and ADC4 of the standby backup ignition device B is calculated through the isolation acquisition circuit to obtain the backup ignition device's voltage difference. Based on the backup ignition device's voltage difference and the preset current output by the constant current source, the resistance R2 of the backup ignition device is calculated. When the backup ignition device meets the requirements, the working circuit is turned on to drive the backup ignition device to detonate.

[0097] In this embodiment, when the system is detected to be powered on, the first detection circuit between the detonating power supply and the main pyrotechnic device is activated, and the resistance of the main pyrotechnic device is detected. If the main pyrotechnic device fails the resistance detection, the second detection circuit between the detonating power supply and the backup pyrotechnic device is activated, and the resistance of the backup pyrotechnic device is detected. If the backup pyrotechnic device passes the resistance detection, the working circuit between the detonating power supply and the backup pyrotechnic device is activated, so that the detonating power supply can drive the backup pyrotechnic device to detonate through the working circuit. This embodiment enters a pyrotechnic self-test mode upon system power-up. It first performs a resistance test on the main pyrotechnic. If an abnormal resistance value is detected in the main pyrotechnic, it automatically performs a resistance test on the backup pyrotechnic. When the backup pyrotechnic passes the resistance test, it is connected to the working circuit, and the main pyrotechnic is detonated by the initiating power supply. This eliminates the need for manual setting to the detection mode before testing begins. Furthermore, the addition of a backup pyrotechnic in the hardware allows for timely connection when the main pyrotechnic's resistance value is abnormal. It also eliminates the need for manual replacement of pyrotechnics when their resistance is found to be substandard, improving both the safety and efficiency of troubleshooting abnormal pyrotechnics. An enable module ensures that the system will not mistakenly re-enter the self-test mode after entering normal mode, and that the system will not misuse substandard pyrotechnics, thus ensuring greater safety during switching of working modes and automatic switching between main and backup pyrotechnics.

[0098] 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. Unless otherwise specified, 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.

[0099] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0100] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0101] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A self-testing system for the resistance of pyrotechnic products, characterized in that, The system includes an initiation power supply, a control module, a pyrotechnic resistance detection branch, a pyrotechnic working branch, a main pyrotechnic and a backup pyrotechnic; the pyrotechnic resistance detection branch and the pyrotechnic working branch are both connected to the control module. The pyrotechnic resistance detection branch is used to connect the first detection circuit between the detonating power source and the main pyrotechnic when the first resistance detection signal sent by the control module is received. The control module is also used to perform resistance detection on the main pyrotechnic component when the first detection circuit is turned on, and to send a second resistance detection signal when the main pyrotechnic component fails the resistance detection. The pyrotechnic resistance detection branch is also used to connect the second detection circuit between the detonating power source and the prepared pyrotechnic when the second resistance detection signal is received. The control module is also used to perform resistance detection on the standby pyrotechnic device when the second detection circuit is turned on, and to output an initiation control signal to the working branch of the pyrotechnic device when the standby pyrotechnic device passes the resistance detection. The working branch of the pyrotechnic device is used to connect the working circuit between the initiation power supply and the standby pyrotechnic device when the main pyrotechnic device fails to pass the resistance detection and receives the initiation control signal, so as to drive the standby pyrotechnic device to detonate through the initiation power supply. The system further includes a signal output module and an enable module. The input terminal of the signal output module is connected to the output terminal of the control module, the output terminal of the signal output module is connected to the pyrotechnic resistance detection branch and the pyrotechnic working branch, and the enable terminal of the signal output module is connected to the output terminal of the enable module. The control module is also used to output control signals to the signal output module, the control signals including a first resistance detection signal, a second resistance detection signal and a detonation control signal; The enabling module is used to acquire the system power-on duration when the detection system is powered on, and output an enabling signal to the signal output module according to the system power-on duration and a preset duration threshold. The signal output module is used to output the control signal to the pyrotechnic resistance detection branch or the pyrotechnic working branch when the enable signal is a valid enable signal.

2. The system as described in claim 1, characterized in that, The pyrotechnic resistance detection branch is further configured to, upon receiving the first resistance detection signal, connect the first detection circuit between the detonating power supply, the constant current source, and the main pyrotechnic, and supply power to the main pyrotechnic through the constant current source; and The pyrotechnic resistance detection branch is also used to connect the second detection circuit between the detonation power supply, the constant current source and the standby pyrotechnic when the second resistance detection signal is received, and to supply power to the standby pyrotechnic through the constant current source.

3. The system as described in claim 1, characterized in that, The system also includes a branch switching switch, and the pyrotechnic resistance detection branch includes a constant current source, a first switch, and a second switch. The output terminal of the detonating power supply is connected to the first terminal of the branch switching switch; the input terminal of the constant current source is connected to the second terminal of the branch switching switch; the output terminal of the constant current source is connected to the first terminal of the main pyrotechnic device; the second terminal of the main pyrotechnic device is connected to the first terminal of the first switch; and the second terminal of the first switch is grounded. The first terminal of the backup pyrotechnic device is connected to the output terminal of the constant current source; the second terminal of the backup pyrotechnic device is connected to the first terminal of the second switch; and the second terminal of the second switch is grounded. The third terminal of the branch switching switch is connected to the input terminal of the working branch of the pyrotechnic device; and the output terminal of the working branch of the pyrotechnic device is connected to the first terminals of both the main pyrotechnic device and the backup pyrotechnic device.

4. A method for self-testing the resistance of pyrotechnic items based on the pyrotechnic resistance self-testing system according to any one of claims 1-3, characterized in that, The method includes: When the system is detected to be powered on, the system power-on duration is acquired, and an enable signal is output according to the system power-on duration and a preset duration threshold. When the enable signal is a valid enable signal, the first detection circuit between the detonating power supply and the main pyrotechnic device is controlled to be turned on, and the resistance of the main pyrotechnic device is detected. When the main pyrotechnic device fails the resistance test, the second detection circuit between the initiation power supply and the standby pyrotechnic device is activated, and the standby pyrotechnic device is subjected to resistance testing. When the ignition device passes the resistance detection, the working circuit between the detonating power supply and the ignition device is controlled to be connected, so that the detonating power supply can drive the ignition device to detonate through the working circuit.

5. The method as described in claim 4, characterized in that, The step of controlling the first detection circuit between the detonation power supply and the main pyrotechnic device to be turned on when the system is detected to be powered on, and performing resistance detection on the main pyrotechnic device, includes: When the system is detected to be powered on, the control branch switching switch connects the detonation power supply to the pyrotechnic resistance detection branch. The first switch in the pyrotechnic resistance detection branch is closed to activate the first detection circuit between the detonating power source and the main pyrotechnic. The output current of the detonation power supply is converted into a preset current by a constant current source to supply power to the main pyrotechnic device, and the differential pressure of the main pyrotechnic device is sampled to obtain the differential pressure of the main pyrotechnic device. The resistance of the main ignition device is detected based on the pressure difference of the main ignition device and the preset current.

6. The method as described in claim 5, characterized in that, When the main pyrotechnic fails the resistance test, controlling the second detection circuit between the detonating power supply and the backup pyrotechnic to be activated, and performing a resistance test on the backup pyrotechnic, includes: When the main pyrotechnic component fails the resistance test, the first switch is controlled to open to cut off the first detection circuit; The second switch in the pyrotechnic resistance detection branch is closed to connect the second detection circuit between the detonating power supply and the standby pyrotechnic. The output current of the detonating power supply is converted into a preset current by a constant current source to supply power to the standby ignition device, and the pressure difference of the standby ignition device is sampled to obtain the pressure difference of the standby ignition device. The resistance of the ignition device is detected based on the preset current and the voltage difference of the ignition device.

7. The method as described in claim 6, characterized in that, When the ignition device passes the resistance detection, controlling the working circuit between the detonating power supply and the ignition device to be connected, so as to drive the ignition device to detonate through the detonating power supply, includes: When the standby ignition device passes the resistance detection, the control branch switching switch is disconnected from the ignition device detection branch, and the control branch switching switch is connected to the ignition device working branch to conduct the working circuit between the detonation power supply and the standby ignition device. The detonating power source and the working circuit drive the preparation ignition device to detonate.

8. The method as described in claim 4, characterized in that, The step of controlling the first detection circuit between the detonating power supply and the main pyrotechnic device to be turned on when the system is detected to be powered on, and performing resistance detection on the main pyrotechnic device, further includes: When the system is powered on, a first resistance detection signal is output to the signal output module. The signal output module is used to be in working state when it receives a valid enable signal output by the enable module. The first resistance detection signal is output to the pyrotechnic resistance detection branch through the signal output module in operation, so as to connect the first detection circuit between the detonation power supply and the main pyrotechnic. When the first detection circuit is turned on, the resistance of the main pyrotechnic device is detected.

9. The method as described in claim 8, characterized in that, The enabling module is used to obtain the system power-on duration when the system is powered on, and output a valid enabling signal when the power-on duration is less than a preset duration threshold. as well as When the power-on duration is greater than or equal to the preset duration threshold, an invalid enable signal is output.

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