A multifunctional safety hardware test fixture

Abstract

The present invention discloses a multifunctional safety hardware test fixture, comprising: a configurable first test connector externally connected to a tested board; a configurable second test connector externally connected to a test instrument; and a configurable test configuration matrix connecting the first test connector and the second test connector. The present invention is universal for different hardware board types and supports multiple hardware tests, which can reduce the manpower and material costs in the test process and greatly improve the test work efficiency.

Description

Technical Field

[0001] The present invention relates to the field of functional safety hardware testing, and in particular to a multifunctional safety hardware testing fixture. Background Art

[0002] In the field of functional safety such as rail transit, automotive electronics, and industrial control, the functional safety hardware development test verification and confirmation process needs to follow safety standards and specifications to conduct various verification tests on the hardware. These tests include high voltage test, insulation impedance test, function test, performance test, hardware fault injection test and other different tests. In the existing R&D test process, for different tests at different stages, testers are often required to design different test fixtures or manually modify the tested hardware board to perform different tests. The testing process not only consumes a lot of manpower and material resources, but also requires different test environments to be built for different tests. The test fixtures are not universal and the test efficiency is relatively low. For example: for high voltage test and insulation impedance test, special test boards need to be designed for different hardware boards to lead different groups of networks to the test network through the test boards; for function and performance testing, a set of different test boards need to be designed to introduce test excitation signals and lead out the test objects for test observation; when performing hardware fault injection testing, since it is necessary to simulate different hardware single-point faults according to the standards, it is often necessary to manually modify the tested hardware board repeatedly to inject faults and restore faults. Summary of the invention

[0003] The purpose of the present invention is to provide a multifunctional safety hardware test fixture, which is universal for different hardware board types and supports multiple hardware tests, can reduce the manpower and material costs in the testing process, and greatly improve the testing work efficiency.

[0004] The technical solution to achieve the above purpose is:

[0005] A multifunctional safety hardware test fixture, comprising:

[0006] A configurable first test connector externally connected to a board under test;

[0007] A configurable second test connector for external test equipment;

[0008] A configurable test configuration matrix connects the first test connector and the second test connector.

[0009] Preferably, the first test connector is provided with a plurality of test through holes according to the standard spacing of European connectors;

[0010] The test through-hole is connected to the tested board through an external test cable and a Euro-type connector; or

[0011] The test through-hole is connected to the tested board through an external test cable and a standard pin header.

[0012] Preferably, the first test connector is connected to the test configuration matrix via an internal straight-through test lead.

[0013] Preferably, the test configuration matrix uses a jumper to directly connect the second test connector.

[0014] Preferably, each test point group in the test configuration matrix includes: a test lead point, a through connection test point, a pull-up test point and a pull-down test point.

[0015] The test lead point is selected to be connected with any one of the through connection test point, the pull-up test point or the pull-down test point by a jumper wire;

[0016] The through connection test point is directly connected to the second test connector;

[0017] The signal injected through the pull-up test point is fixed at a high level or short-circuited to a power supply failure;

[0018] The signal injected through the pull-down test point is fixed at a low level or short-circuited to ground fault.

[0019] Preferably, each test point group in the test configuration matrix includes: a test lead point, and a plurality of test connection points respectively connected to the test lead points;

[0020] The test leads and the test connection points are isolated from each other to meet the requirements of the safety specification reinforced insulation standard;

[0021] A test connection point jumper in a plurality of test point groups belonging to the same packet network is connected to the same test channel of the second test connector.

[0022] The beneficial effects of the present invention are as follows: the present invention has universality for different hardware board types by configuring test connectors or test cables through universal standard spacing test holes. Through the configurable test matrix on the test device, different test configurations are implemented using jumpers to support various types of tests such as functional performance testing, high-voltage insulation testing, and hardware fault injection testing. The manpower and material resources for designing and deploying different test fixtures and manually modifying the tested hardware can be saved, and the test efficiency can be improved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural diagram of the multifunctional safety hardware test fixture of the present invention;

[0024] Figure 2 It is the configuration diagram of the 3U test extension board in the present invention;

[0025] Figure 3It is the configuration diagram of the 6U test extension board in the present invention;

[0026] Figure 4 It is a configuration diagram of the hardware fault injection test board in the present invention;

[0027] Figure 5 It is a configuration diagram of high voltage insulation test in the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] During the development and verification test process, functional safety hardware needs to undergo various tests and verifications, such as high voltage testing, insulation impedance testing, functional testing, performance testing, and hardware fault injection testing. In actual R&D testing, it is often necessary to manually modify the hardware being tested, or to design a variety of different test fixtures for testing, which is costly and inefficient. The multifunctional safety hardware test fixture of the present invention can be used for the above various tests, and is universal for different hardware board types, which can save the manpower and material resources of designing and deploying different test fixtures and manually modifying the hardware being tested, and at the same time improve the test efficiency.

[0030] See also Figure 1 The present invention provides a multifunctional safety hardware test fixture, including: a first test connector 1, a second test connector 2, and a test configuration matrix 3.

[0031] The first test connector 1 is evenly provided with a plurality of test through holes, such as test through holes with a universal standard spacing (2.54 mm), and is connected to different types of boards to be tested through a configurable test connector or a test cable.

[0032] If the tested board uses a standard European connector, a corresponding matching European connector can be directly installed on the first test connector 1 according to the connector type of the tested board, and connected using an external test cable.

[0033] For connection with non-standard connectors, a standard pin header can be installed on the first test connector 1, and then connected to the tested board through an external test cable. The test cable connected to the tested board needs to meet the reinforced insulation requirements.

[0034] The first test connector 1 is connected to the test configuration matrix 3 through an internal straight-through test lead. The test configuration matrix 3 is composed of test through holes with standard spacing, and can support different types of hardware tests through different test jumper configurations.

[0035] For example: Figure 2The figure shows the implementation of the standard 3U extension board test configuration to support functional testing and performance testing. In the figure, the first test connector 1 (J1) is configured as a 5*32 standard test through hole, C1 is an internal straight-through test lead, and the distance between the test leads meets the insulation gap requirement of greater than 2.54mm. The test configuration matrix 3 (S1) uses a jumper to connect directly to the second test connector 2 (J2), and the second test connector 2 is then connected to the test instrument through an external test cable. Using a similar configuration, the standard 6U test extension board can be extended. Refer to the attached Figure 3 . Figure 3 In the example, J3, C2, S2 and J4 correspond to Figure 2 Among J1, C1, S1 and J2.

[0036] The main difference between the hardware fault injection test configuration and the above test extension board configuration is the configuration of the test matrix. Figure 4 As shown, each test point group in the test configuration matrix 3 includes: a test lead point E0, a through connection test point E2, a pull-up test point E1 and a pull-down test point E3.

[0037] The test lead point E0 is connected to the through-connection test point E2, and the through-connection test point E2 is directly connected to the second test connector 2, and can be directly connected to an external test instrument, through which a normal excitation signal or an abnormal oscillation excitation signal can be injected. If the short-circuit jumper of E0 and E2 is disconnected, a signal open circuit fault can be injected. In addition to the through-connection test point E2, a pull-up test point E1 and a pull-down test point E3 are added. If E0 and E1 are connected, a signal fixed at a high level or short-circuited to a power supply fault (the pull-up resistor is selected as 0 ohms or shorted) can be injected. If E0 and E3 are connected, a signal fixed at a low level or short-circuited to a ground fault (the pull-down resistor is selected as 0 ohms or shorted). Therefore, by simulating jumpers to short-circuit different network test lead points E0 (or through-connection test points E2), a short-circuit fault between two network channels can be simulated; in addition to conveniently performing injection testing and fault recovery of single-point faults, the present invention can also perform injection testing and recovery of multi-point faults, which can greatly improve the efficiency of hardware fault injection testing.

[0038] The high voltage isolation and insulation impedance test configuration is as follows: Figure 5As shown, the main difference between its configuration and the above-mentioned test extension board lies in the pairing relationship between the test lead points and the test connection points. For the test extension board, the test points are connected one by one according to the straight-through connection test relationship. For high-voltage isolation and insulation impedance tests, different groups need to be connected according to safety hardware requirements. At this time, each test point group in the test configuration matrix 3 includes: test lead points, and multiple test connection points (A0..., B0..., C0..., D0..., E0...) that are respectively connected to the test lead points. A test connection point in the multiple test point groups belonging to the same group network is connected by a jumper to the same test channel of the second test connector 2. For example: If A0, B3, C12, and D6 are a group of the same group network according to hardware requirements, then these four points are all connected to the same test channel of the second test connector 2 (J2) through jumpers. Considering general hardware grouping requirements and test instrument channel limitations, Figure 5 The second test connector 2 (J2) in the figure only has 32 channels (generally, the complexity of the board test will not exceed 32 channels), and it can be expanded to a maximum of 160 test channels. The isolation between the test leads and the test connection points meets the requirements of the safety specification reinforced insulation standard.

[0039] In summary, for functional and performance testing, by configuring a straight-through test configuration matrix, the test stimulus input to the tested board and the derived test object can be tested. For high voltage testing and insulation impedance testing, different channel network combination tests can be performed by configuring jumpers or other short-circuiting methods. For hardware fault injection testing, the matrix can be configured to simulate open circuits, short circuits to power, short circuits to ground, short circuits between different signals, and signal oscillations. Only the test configuration matrix jumpers need to be changed. The operation is convenient and simple, which can greatly improve work efficiency and reduce testing costs.

[0040] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A multifunctional safety hardware test fixture, characterized in that: include: A configurable first test connector externally connected to a board under test; A configurable second test connector for external test equipment; a configurable test configuration matrix connecting the first test connector and the second test connector; Each test point group in the test configuration matrix includes: a test lead point, a through connection test point, a pull-up test point and a pull-down test point, The test lead point is selected to be connected with any one of the through connection test point, the pull-up test point or the pull-down test point by a jumper wire; The through connection test point is directly connected to the second test connector; The signal injected through the pull-up test point is fixed at a high level or short-circuited to a power supply failure; A signal is injected through the pull-down test point to fix the low level or short-circuit to ground fault; Alternatively, each test point group in the test configuration matrix includes: a test lead point, and a plurality of test connection points respectively connected to the test lead points; The distance between the test leads meets the insulation clearance requirement of greater than 2.54mm; A test connection point jumper in a plurality of test point groups belonging to the same packet network is connected to the same test channel of the second test connector; The test configuration matrix uses a jumper to directly connect to the second test connector.

2. The multifunctional safety hardware test fixture according to claim 1, characterized in that: The first test connector is provided with a plurality of test through holes according to the standard spacing of European connectors; The test through-hole is connected to the tested board through an external test cable and a European connector; or The test through-hole is connected to the tested board through an external test cable and a standard pin header.

3. The multifunctional safety hardware test fixture according to claim 1, characterized in that: The first test connector is connected to the test configuration matrix via internal straight-through test leads.

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