A test circuit for testing resistance of a pyrotechnic circuit and the pyrotechnic circuit

Abstract

The utility model relates to the field of aerospace technology discloses a kind of pyrotechnics loop resistance test circuit and pyrotechnics, comprising: reference circuit, test switch circuit and processing module, wherein, reference circuit, its first end accesses test power supply, its second end is connected with the first end of test switch circuit;Test switch circuit, its second end is connected with the first end of pyrotechnics loop, it is used to be formed by different switch loop, to the target resistance of pyrotechnics loop is inserted into test loop;Pyrotechnics loop, its second end is grounded;Processing module, it is used to simultaneously collect the voltage across reference circuit, and based on the resistance value and the voltage across reference circuit of reference circuit, the resistance value of target resistance is calculated.The utility model in the middle, in the process of testing, processing module is by using the mode of simultaneously collecting reference resistance voltage and measured resistance voltage, solve the problem of power supply voltage fluctuation influence test precision, ensure high test precision.

Description

Technical Field

[0001] This utility model relates to the field of aerospace technology, specifically to a circuit for testing the resistance of a pyrotechnic circuit and a pyrotechnic device. Background Technology

[0002] As the core equipment of the space transportation system, the reliability of the launch vehicle's onboard systems directly determines the success or failure of the launch mission. Pyrotechnics, as key components of the rocket, play a decisive role in actions such as separation and unlocking. Accurate testing of their performance parameters is a crucial step in ensuring the safe and reliable operation of the rocket.

[0003] The current mainstream pyrotechnic testing technologies mainly include two categories: one is current source pyrotechnic resistance testing technology, which obtains resistance data through constant current excitation; the other is voltage-type time-division acquisition pyrotechnic testing technology, which performs time-division measurement on the reference resistor and the resistor under test to achieve pyrotechnic performance evaluation.

[0004] However, due to the susceptibility to interference from the complex electromagnetic environment on the rocket during testing, the stability of signal acquisition is difficult to guarantee, resulting in significant errors in the test results. At the same time, the time-division measurement mechanism means that the testing of the reference and the measured resistance are not carried out synchronously, which cannot offset the influence of environmental parameter fluctuations in real time. Ultimately, this results in weak anti-interference capability and low test accuracy, making it difficult to meet the stringent requirements of modern launch vehicles for high-precision testing of pyrotechnic components. Utility Model Content

[0005] In view of this, the present invention provides a circuit for testing the resistance of a pyrotechnic circuit and a pyrotechnic device, in order to solve the problems of weak anti-interference ability and low testing accuracy when using a time-division testing scheme.

[0006] In a first aspect, this utility model provides a circuit for testing the resistance of a pyrotechnic circuit, comprising: a reference circuit, a test switch circuit, and a processing module. The reference circuit has a first terminal connected to a test power supply and a second terminal connected to the first terminal of the test switch circuit. The test switch circuit has a second terminal connected to the first terminal of the pyrotechnic circuit and is used to connect the target resistance of the pyrotechnic circuit in series into the test circuit by constructing different switch circuits. The pyrotechnic circuit has a second terminal grounded. The processing module is used to simultaneously acquire the voltage across the reference circuit and calculate the resistance value of the target resistance based on the resistance value of the reference circuit and the voltage across it.

[0007] In this invention, during the testing process, the processing module solves the problem of power supply voltage fluctuations affecting test accuracy by simultaneously acquiring the reference resistor voltage and the voltage of the resistor under test, thus ensuring high test accuracy.

[0008] In one alternative implementation, the reference circuit includes a reference resistor.

[0009] In one alternative embodiment, the pyrotechnic circuit consists of multiple loop resistors, and the test switch circuit includes: multiple loop switches, wherein each loop switch has a first terminal connected to a second terminal of a reference circuit and a second terminal connected to a first terminal of a loop resistor; and each loop resistor has a second terminal grounded.

[0010] In one alternative implementation, the test switch circuit further includes a test master switch, wherein each loop switch has its first terminal connected to a second terminal of a reference circuit via the test master switch.

[0011] In one alternative implementation, the pyrotechnic circuit resistance test circuit further includes a self-test circuit, the first terminal of which is connected to the second terminal of the reference circuit, and the second terminal of which is grounded.

[0012] In one optional embodiment, the self-test circuit includes: a self-test resistor and a self-test switch, wherein the first terminal of the self-test switch is connected to the second terminal of the reference circuit, and the second terminal of the self-test switch is connected to the first terminal of the self-test resistor; the second terminal of the self-test resistor is grounded.

[0013] In one optional embodiment, the pyrotechnic circuit resistance test circuit further includes: multiple test power supplies, wherein the output terminal of each test power supply is connected to the first terminal of the reference circuit; the multiple test power supplies are redundant and have backup for each other.

[0014] In one alternative embodiment, the pyrotechnic circuit resistance test circuit further includes a reverse protection circuit, wherein the first terminal of the reference circuit is connected to each test power supply through the reverse protection circuit.

[0015] In one alternative implementation, the anti-reverse circuit includes a plurality of diodes, wherein the cathode of each diode is connected to a first terminal of a reference circuit and the anode is connected to the output terminal of a test power supply.

[0016] Secondly, this utility model provides a pyrotechnic device, including: a pyrotechnic device circuit and a pyrotechnic device circuit resistance test circuit according to the first aspect and any optional embodiment thereof. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a diagram showing the composition of a circuit for testing the resistance of a pyrotechnic circuit according to an embodiment of the present invention.

[0019] Figure 2 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0020] Figure 3 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0021] Figure 4 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0022] Figure 5 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0023] Figure 6 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0024] Figure 7 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0025] Figure 8 This is a diagram showing the composition of another pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0026] Figure 9 This is a detailed circuit structure diagram of the pyrotechnic circuit resistance test circuit according to an embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of the self-test process of the pyrotechnic circuit resistance test circuit according to an embodiment of the present utility model;

[0028] Figure 11 This is a schematic diagram of the normal test process of the pyrotechnic circuit resistance test circuit according to an embodiment of the present utility model;

[0029] Figure 12 This is a test error waveform diagram based on a traditional time-division acquisition embodiment. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] During a launch mission, critical actions such as rocket separation, satellite-rocket separation, and fairing jettison all rely on the massive energy released instantaneously by the pyrotechnic devices. The various pyrotechnic resistors installed on the rocket, as key components of the pyrotechnic system, typically have resistance values ​​in the low-resistance range of milliohms to ohms. Even minute deviations in resistance can cause the pyrotechnics to fail to detonate properly or trigger falsely, potentially leading to catastrophic consequences such as damage to the satellite and rocket. Therefore, it is essential to use a high-precision resistance testing system to meticulously measure the resistance of the pyrotechnic components to ensure the connection of the pyrotechnic links is secure and reliable, guaranteeing that the current is transmitted accurately along the preset path, laying the foundation for the normal detonation of the pyrotechnics.

[0032] Furthermore, pyrotechnics are inherently explosive products, extremely sensitive to external stimuli such as static electricity, electromagnetic interference, and overcurrent. During testing, an improperly designed test scheme, such as generating excessively high test voltages, excessively large current fluctuations, or failing to effectively shield against external electromagnetic interference, could accidentally trigger an explosion of the pyrotechnic, seriously threatening the lives of ground testing personnel and the safety of expensive aerospace equipment. Therefore, when developing a resistance testing scheme for pyrotechnics, it is crucial not only to pursue high accuracy of the test results but also to prioritize the reliability and safety of the scheme. Through multiple redundancy designs, stringent electromagnetic compatibility measures, and comprehensive overvoltage and overcurrent protection mechanisms, the test process can be ensured to proceed smoothly and safely, safeguarding the successful launch of the carrier rocket.

[0033] Based on this, this embodiment provides a circuit for testing the resistance of a pyrotechnic circuit, such as... Figure 1 As shown, it includes: a reference circuit 1, a test switch circuit 2, and a processing module 3.

[0034] like Figure 1 As shown, the reference circuit 1 has its first terminal connected to the test power supply 4, and its second terminal connected to the first terminal of the test switch circuit 2.

[0035] Specifically, the reference circuit 1 is used to provide a reference resistor. Optionally, the reference circuit 1 can be composed of purely resistive components, or it can be composed of key components such as high-stability resistive elements, temperature compensation circuits, and operational amplifiers working together to continuously output a reference resistor with constant resistance and extremely high accuracy under complex and variable environmental conditions.

[0036] like Figure 1 As shown, the test switch circuit 2 has its second terminal connected to the first terminal of the pyrotechnic circuit 5. It is used to connect the target resistor of the pyrotechnic circuit 5 into the test circuit by forming different switch circuits. The second terminal of the pyrotechnic circuit 5 is grounded.

[0037] Specifically, the pyrotechnic circuit 5 is composed of multiple circuit resistors connected in parallel, while the test switch circuit 2 can form various circuits to realize the insertion of the target resistor into the test circuit. The target resistor is not limited to a single circuit resistor, but can also be the overall resistance of the pyrotechnic circuit 5, which can be set as needed.

[0038] Processing module 3 is used to simultaneously acquire the voltage across the reference circuit 1 and calculate the resistance value of the target resistor based on the resistance value of the reference circuit 1 and the voltage across its two ends.

[0039] Specifically, if the voltage across the reference circuit 1 is measured in a time-division manner, the fluctuation of the test power supply 4 will cause test errors and affect the calculation accuracy. Therefore, the processing module 3 simultaneously collects the voltage across the reference circuit 1, that is, when the output voltage of the test power supply 4 is the same, the voltage across the reference circuit 1 is collected simultaneously.

[0040] Specifically, since the second terminal of the pyrotechnic circuit 5 is grounded, the voltage at the second terminal of the reference circuit 1 is the voltage of the target resistor. Based on the voltage at both ends of the reference circuit 1 and the resistance value of the reference circuit 1, the current of the target resistor can be calculated. Thus, based on the voltage and current of the target resistor, the resistance value of the target resistor is obtained.

[0041] Optionally, the processing module 3 compares the resistance value of the target resistor with the corresponding preset resistance value to determine whether the target resistor is faulty.

[0042] Specifically, after obtaining the real-time resistance value data of the target resistor, the processing module 3 will immediately retrieve the preset resistance value parameters stored in the system ROM. These preset resistance values ​​are standard values ​​determined under ideal working conditions and strict calibration conditions, covering the rated resistance values ​​of different types of resistors and the allowable error range.

[0043] Subsequently, processing module 3 initiates the difference calculation and threshold judgment program, comparing the actual resistance value of the target resistor with the preset resistance value bit by bit. It not only calculates the absolute difference between the two but also performs a relative error assessment based on a preset percentage tolerance standard. If the actual resistance value exceeds the preset tolerance range—whether it's too large, too small, or exhibits abnormal fluctuations—processing module 3 will quickly trigger a fault alarm mechanism and generate a diagnostic report containing detailed information such as the faulty resistor number, actual resistance value, and degree of deviation. This comparison and judgment process not only quickly locates resistor faults but also provides accurate data support for subsequent equipment maintenance and performance optimization, ensuring that the pyrotechnic circuit 5 remains in a stable and reliable operating state.

[0044] In some alternative implementations, such as Figure 2 As shown, reference circuit 1 includes a reference resistor R1. Specifically, the specific structure of reference circuit 1 is not limited to... Figure 2The form can be a single resistor, or it can be multiple resistors connected in series and parallel, without any restriction.

[0045] In some alternative implementations, such as Figure 3 As shown, the pyrotechnic circuit 5 is composed of multiple circuit resistors (R3 to R5), and the test switch circuit 2 includes multiple circuit switches (K3 to K5). Each circuit switch has its first terminal connected to the second terminal of the reference circuit 1 and its second terminal connected to the first terminal of a circuit resistor. Each circuit resistor has its second terminal grounded.

[0046] Specifically, Figure 3 In this circuit, each loop resistor is equipped with a loop switch, and the test switch circuit 2 can detect the resistance value of each loop resistor. For example, when K3 is closed and K4 and K5 are open, R3 is connected in series in the test loop, and the voltage at the second terminal of the reference circuit 1 is the voltage of R3; when K4 is closed and K3 and K5 are open, R3 is connected in series in the test loop, and the voltage at the second terminal of the reference circuit 1 is the voltage of R4; when K5 is closed and K3 and K4 are open, R5 is connected in series in the test loop, and the voltage at the second terminal of the reference circuit 1 is the voltage of R5.

[0047] Optionally, Figure 3 The test switch circuit shown is a precision testing circuit. Multiple resistors can also be used to share a single circuit switch to achieve a rough test.

[0048] In some alternative implementations, such as Figure 4 As shown, the test switch circuit 2 also includes a test main switch K2. Each loop switch has its first terminal connected to the second terminal of the reference circuit 1 via the test main switch K2.

[0049] Specifically, during normal testing, the main test switch K2 is closed. For example, when K2 and K3 are closed and K4 and K5 are open, R3 is connected in series in the test circuit, and the voltage at the second terminal of reference circuit 1 is the voltage of R3; when K2 and K4 are closed and K3 and K5 are open, R3 is connected in series in the test circuit, and the voltage at the second terminal of reference circuit 1 is the voltage of R4; when K2 and K5 are closed and K3 and K4 are open, R5 is connected in series in the test circuit, and the voltage at the second terminal of reference circuit 1 is the voltage of R5.

[0050] In some alternative implementations, onboard rocket system testing is a critical step in ensuring the success of a rocket launch mission, directly impacting the safety of the spacecraft and astronauts, as well as the achievement of mission objectives. Without a self-testing process before formal testing, the effectiveness and safety of the test circuits face numerous uncertainties. Regarding the effectiveness of the test circuits, the lack of a self-testing mechanism prevents engineers from confirming in advance whether each component in the test circuit is functioning correctly, or whether there are open circuits or short circuits in the signal transmission lines. For example, if a sensor in the test circuit malfunctions, the subsequently collected rocket system data will lack accuracy and reliability. Analysis and decisions based on this erroneous data may lead to misjudgments of the rocket's condition, rendering the results of the formal test meaningless. Figure 5 As shown, the resistance test circuit of the pyrotechnic circuit 5 also includes a self-test circuit 6, the first end of which is connected to the second end of the reference circuit 1, and the second end of which is grounded.

[0051] In some alternative implementations, such as Figure 6 As shown, the self-test circuit 6 includes a self-test resistor R2 and a self-test switch K1. The first terminal of the self-test switch is connected to the second terminal of the reference circuit 1, and the second terminal is connected to the first terminal of the self-test resistor R2. The second terminal of the self-test resistor R2 is grounded.

[0052] In some alternative implementations, reliability issues become apparent if the current source design lacks redundancy. Redundancy aims to ensure seamless system operation by using multiple functionally identical units or paths, allowing others to take over when one part fails. In a current source without redundancy, the entire current source will immediately stop working or output abnormal current if critical components (such as power transistors, control chips, and feedback resistors) fail due to aging, overvoltage surges, or abnormal temperatures. For example, if the power transistor breaks down due to prolonged high-load operation, it not only fails to provide stable current for testing but may also cause uncontrolled output current, resulting in irreversible damage to sensitive electronic equipment on the rocket system. Furthermore, the lack of a backup current source forces the entire testing process to be interrupted. Engineers must spend considerable time troubleshooting, replacing damaged components, and recalibrating the current source, severely delaying the testing schedule and potentially leading to missing test data, affecting the comprehensive assessment of the rocket system's condition and threatening the successful launch. Therefore, if… Figure 7 As shown, the resistance test circuit of the pyrotechnic circuit 5 also includes: multiple test power supplies 4, wherein the output terminal of each test power supply 4 is connected to the first terminal of the reference circuit 1; the multiple test power supplies 4 are redundant and have backup for each other.

[0053] Specifically, the design of multiple test power supplies with mutual redundancy not only significantly improves the reliability of the test system but also greatly enhances its fault tolerance. Even in the extreme case of simultaneous failure of multiple power supplies, as long as the remaining available power supplies can still meet the minimum test requirements, the system can continue to operate, giving engineers valuable time for troubleshooting and repair. Furthermore, this redundancy mechanism can also rationally allocate the workload of each power supply through load balancing strategies, extending power supply lifespan and reducing the cost and time losses caused by frequent power supply replacements. This provides strong support for the efficient and accurate conduct of onboard rocket system testing, reducing the risk of test accidents and launch delays caused by power supply failures from the outset.

[0054] In some alternative implementations, such as Figure 8 As shown, the resistance test circuit of the pyrotechnic circuit 5 also includes a reverse protection circuit 7, wherein the first terminal of the reference circuit 1 is connected to each test power supply 4 through the reverse protection circuit 7.

[0055] Specifically, in the redundant power supply architecture of the rocket system test, the anti-reverse circuit 7 is a key protection module to ensure the safe and reliable operation of the power system. Its core function is to prevent equipment damage and system failure caused by reverse power supply polarity, reverse power supply from backup power, or abnormal current backflow.

[0056] In some alternative implementations, such as Figure 9 As shown, the anti-reverse circuit 7 includes multiple diodes (D1, D2), wherein the cathode of each diode is connected to the first terminal of the reference circuit 1 (R1), and the anode is connected to the output terminal of a test power supply 4.

[0057] In a practical application scenario, based on Figure 9 The specific circuit structure of the test circuit shown should be self-tested before conducting the formal resistance test of circuit 5 for pyrotechnic devices. Figure 10 As shown, first close switch K1, and the current flows through R1 and R2. At the same time, the voltages V3 and V4 are collected, and the resistance value of R2 is calculated using the following formula:

[0058]

[0059] If the R2 test result matches the theoretical value, the circuit is normal and formal testing can proceed; otherwise, the subsequent process will not be carried out.

[0060] In a practical application scenario, based on Figure 9 The specific circuit structure of the test circuit shown, taking the test of the resistance value of R3 as an example, in the formal test procedure, is as follows: Figure 11 As shown, switch K1 is opened, and switches K2 and K3 are closed to test the resistance of the pyrotechnic component R3. The calculation formula is as follows:

[0061]

[0062] If the formal testing process involves time-sharing testing of V3 and V4, such as... Figure 12 As shown, V1 or V2 fluctuates. If the fluctuating voltage is ΔV, then the formula for calculating the resistance R3 is as follows:

[0063]

[0064] The R3 test error is Therefore, by adopting a method that tests V3 and V4 simultaneously, this error can be eliminated, and high-precision testing can be achieved.

[0065] This embodiment provides a pyrotechnic device, including: a pyrotechnic device circuit resistance test circuit of the pyrotechnic device circuit 5 and above embodiments and any optional embodiments thereof.

[0066] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A circuit for testing the resistance of a pyrotechnic circuit, characterized in that, include: The circuit includes a reference circuit, a test switch circuit, and a processing module. A reference circuit, the first end of which is connected to a test power supply, and the second end of which is connected to the first end of the test switch circuit; A test switch circuit, the second terminal of which is connected to the first terminal of the pyrotechnic circuit, is used to connect the target resistance of the pyrotechnic circuit in series into the test circuit by forming different switch circuits. The second terminal of the pyrotechnic circuit is grounded. The processing module is used to simultaneously acquire the voltage across the reference circuit and calculate the resistance value of the target resistor based on the resistance value of the reference circuit and the voltage across its two ends.

2. The pyrotechnic circuit resistance testing circuit according to claim 1, characterized in that, The reference circuit includes a reference resistor.

3. The pyrotechnic circuit resistance testing circuit according to claim 1, characterized in that, The pyrotechnic circuit consists of multiple circuit resistors, and the test switch circuit includes multiple circuit switches, wherein... Each loop switch has its first terminal connected to the second terminal of the reference circuit, and its second terminal connected to the first terminal of a loop resistor. The second terminal of each loop resistor is grounded.

4. The pyrotechnic circuit resistance testing circuit according to claim 3, characterized in that, The test switch circuit further includes: a test main switch, wherein... Each loop switch has its first terminal connected to the second terminal of the reference circuit via a test master switch.

5. The pyrotechnic circuit resistance testing circuit according to claim 1, characterized in that, Also includes: The self-test circuit has its first terminal connected to the second terminal of the reference circuit, and its second terminal grounded.

6. The pyrotechnic circuit resistance testing circuit according to claim 5, characterized in that, The self-test circuit includes: a self-test resistor and a self-test switch, wherein... The self-test switch has its first end connected to the second end of the reference circuit and its second end connected to the first end of the self-test resistor. The self-test resistor has its second terminal grounded.

7. The pyrotechnic circuit resistance testing circuit according to claim 1, characterized in that, Also includes: Multiple test power supplies, among which, Each test power supply has its output terminal connected to the first terminal of the reference circuit; The multiple test power supplies are redundant and have backup power for each other.

8. The pyrotechnic circuit resistance testing circuit according to claim 7, characterized in that, Also includes: Anti-reverse circuit, in which, The reference circuit has its first terminal connected to each test power supply via the anti-reverse circuit.

9. The pyrotechnic circuit resistance testing circuit according to claim 8, characterized in that, The anti-reverse circuit includes: multiple diodes, wherein, Each diode has its cathode connected to the first terminal of the reference circuit and its anode connected to the output terminal of one of the test power supplies.

10. A pyrotechnic device, characterized in that, include: A pyrotechnic circuit and a resistance test circuit for a pyrotechnic circuit according to any one of claims 1-9.

Images