An automated test system for a gyro circuit board

Abstract

The present invention relates to an automatic testing system for gyro circuit boards and belongs to the field of testing. The present invention designs an automatic testing system for gyro circuit boards, which includes: a test fixture module, an operating table module, a software module, and a cable module. It can simultaneously perform tests on multiple gyro circuit boards and meet the requirements for the automatic testing of gyro circuit boards (detection circuit boards, light source circuit boards); the present invention can perform tests on test items such as voltage, current, and ripple, and has the ability to automatically interpret parameters and generate reports; the present invention can achieve automatic circuit board testing, automatic data collection and storage, and has an upload interface; during the testing process of the present invention, the testing system is conveniently connected. The circuit board is placed on the fixture module, and the fixture module is docked with the test bench using an aviation cable, without operations such as manual calibration; the present invention can adapt to the measurement of multiple circuit boards of the same type.

Description

Technical Field

[0001] The present invention belongs to the field of testing, and particularly relates to an automatic testing system for gyro circuit boards. Background Art

[0002] The automatic testing system for gyro circuit boards is to improve the efficiency of circuit board debugging and testing, and reduce problems such as repeated installation and disassembly of equipment caused by humans and incomplete data recording. At present, some circuit board testing systems have limited measurement items and certain limitations for active testing items of circuit boards. The disadvantages of common current circuit board testing systems are as follows: 1. For active testing items (ripple measurement, power supply characteristic testing), after automatic testing, it is necessary to manually view the oscilloscope results, calculate, interpret, and manually enter them into the computer, and finally generate a report; 2. Use ISE software for programming, and use multiple programmers or manually replace the circuit board by humans. The existing testing systems are used for simple printed board passive measurement, and active measurement is limited to direct measurement of current and voltage, data reading, etc., and cannot achieve circuit board testing according to the requirements of the test task book.

[0003] Therefore, how to propose an automatic testing system for gyro circuit boards to meet the requirements of the test task book, meet circuit board testing, data extraction, automatic interpretation, and finally generate a report, and reduce errors and repeated manual operations caused by equipment reasons and human factors is a problem to be solved in this field. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] The technical problem to be solved by the present invention is how to provide an automatic testing system for gyro circuit boards to solve the problems of limited measurement items and certain limitations for active testing items of existing circuit board testing systems.

[0006] (II) Technical Solutions

[0007] To solve the above technical problems, the present invention proposes an automatic testing system for gyro circuit boards, which includes a test fixture module, an operation console module, a software module, and a cable module;

[0008] The test fixture module is divided into two types according to different test items of two circuit boards, namely, the fixture module - light source board and the fixture module - detection board;

[0009] The fixture module - light source board includes a bed-of-nails module, a fixture frame, and a resistance value knob; the fixture module - detection board includes a bed-of-nails module, a fixture frame, a programmer, and a programming drive circuit; the bed-of-nails module includes: a bed-of-nails, a pressure plate, a press pin, and a positioning pin; the fixture frame includes: a fixture power supply box, a motor forward and reverse controller, a wire, a printed circuit board plug docking, a BNC plug, and a power switch;

[0010] The test fixture module is used to connect the test points on the printed circuit board; place the printed circuit board on the pin bed and fix it with the positioning pins. After starting the test fixture, the pressure plate and the positioning pins fix the printed circuit board on the pin bed. The signal points to be measured on the printed circuit board are collected through the pressure pins pressing on the solder joints. One end of the pressure pin is connected to the signal point and the other end is connected to the wire. The other end of the wire is docked with the printed circuit board plug. Among them, the measurement line for measuring the ripple and collecting the waveform is docked with the BNC plug, and the wires are stored in the fixture frame; the programmer and the programming drive circuit are connected by a flat cable.

[0011] The operation console module includes a tabletop frame, a document storage area, an idle fixture storage area, an equipment storage area, a button arm, a display, and a power switch; the equipment storage area includes: a PXI host, a relay board, a multimeter, a programmable power supply, a multiplexer, an operation console power supply box, a terminal board, and an oscilloscope.

[0012] The software module controls the entire gyro circuit board automated test system, is developed on LabVIEW 2015, and adopts a modular and platform-based software design. The software system includes: a test module, a statistics module, and a drive module. The software uses password control for two levels of permissions.

[0013] The cable module has three parts. The first part is the wiring of the probe and the aviation plug in the test fixture part; the second part is the wiring for the aviation plug docking between the operation console module and the test fixture module; the third part is the wiring for the internal power supply and electrical connection of the test bench.

[0014] (III) Beneficial effects

[0015] The present invention proposes a gyro circuit board automated test system. The present invention designs a gyro circuit board automated test system, which mainly consists of a test fixture module, an operation console module, a software module, and a cable module. It can simultaneously realize the testing of multiple gyro circuit boards and meet the requirements of the automated testing of gyro circuit boards (detection circuit boards, light source circuit boards).

[0016] The present invention can realize the testing of test items such as voltage, current, and ripple, and has the ability to automatically interpret parameters and generate reports.

[0017] The present invention can realize the automated testing, automatic data acquisition, and storage of circuit boards, and has an upload interface.

[0018] During the testing process of the present invention, the test system is conveniently connected. The circuit board is placed on the fixture module, and the fixture module is docked with the test bench using aviation cables, without the need for manual calibration and other operations.

[0019] The present invention can adapt to the measurement of multiple circuit boards of the same type.

[0020] The effects of the present invention

[0021] The present invention designs an automatic test system for gyro circuit boards, which can simultaneously meet the requirements of automatic testing of multiple circuit boards, and can satisfy functions such as automatic data acquisition, interpretation, storage, and uploading.

[0022] It avoids the operation process of the printed circuit board welding test line.

[0023] It adapts to the mass production efficiency, improves the circuit board test efficiency, and can reduce errors caused by factors such as instruments and humans. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the general test bench model for the gyro circuit board of the present invention.

[0025] Figure 2(a) is a front view of the light source board tooling module; Figure 1 (b) is a front view of the detection board tooling module; Figure 1 (c) is a schematic diagram of the bed-of-nails module; (d) is a schematic diagram of the tooling frame; Figure 1 (e) is a second back view schematic diagram of the tooling module;

[0026] Figure 3 It is a schematic diagram after the tooling probe is pressed down;

[0027] Figure 4 It is a top view schematic diagram of the operation console module;

[0028] Figure 5 It is a schematic diagram of the functional area of the operation console; Figure 1 ;

[0029] Figure 6 It is a second external shape schematic diagram of the operation console;

[0030] Figure 7 It is a front and back schematic diagram of the equipment storage area;

[0031] Figure 8(a) is a schematic diagram of the operation table surface, (b) is a second schematic diagram of the operation table surface;

[0032] Figure 9 It is a schematic diagram of the software configuration;

[0033] Figure 10 It is a schematic diagram of the software interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, contents, and advantages of the present invention clearer, the following further describes in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments.

[0035] The present invention designs an automatic test system for gyro circuit boards, which relates to a fully automatic measurement system for gyro circuit boards, realizing automatic testing, automatic calibration, and automatic interpretation of circuit boards, and meeting regulatory requirements, saving costs, and improving efficiency of the test system.

[0036] The object of the present invention is to design an automatic test system for gyro circuit boards, which is used to realize the automatic testing of multiple gyro circuit boards (detection circuit boards, light source circuit boards), and can measure all functions of the gyro circuit boards (functions such as resistance value, voltage, current, communication, software, ripple, etc.), automatically collect data, interpret the test results, and generate corresponding test reports, significantly improving the test efficiency. During the test process, there is no need to change the site, test equipment, or move the printed circuit board, avoiding the error risks caused by equipment differences and human factors, and ensuring the accuracy of the test results.

[0037] An automatic test system for gyro circuit boards includes: a test fixture module, an operation console module, a software module, and a cable module. The overall model is shown in the appendix Figure 1 as shown.

[0038] The operation console module is a universal test bench for various models. The test fixture module is specially customized according to the model. The test software contains an automatic selection module, covering all test items of the gyro circuit board.

[0039] The gyro circuit board is divided into a detection circuit board and a light source drive board. The test fixture module is divided into two types according to the different test items of the two circuit boards, namely, the fixture module - light source board and the fixture module - detection board. The fixture module is shown in Figure 2 of the attached drawings.

[0040] The test fixture module - light source board includes a bed-of-nails module, a fixture frame, and a resistance value knob, as shown in Figure 2(a) of the attached drawings. The bed-of-nails module is shown in Figure 2(c) of the attached drawings, and the fixture frame is shown in Figure 2(d) of the attached drawings. The bed-of-nails module includes: a bed-of-nails, a pressure plate, a press pin, and a positioning pin. The fixture frame includes: a fixture power supply box, a motor forward and reverse controller, a wire, a printed circuit board plug docking, a BNC plug, and a power switch.

[0041] The test fixture module - detection board includes a bed-of-nails module, a fixture frame, a programmer, and a programming drive circuit. As shown in Figure 2(b) of the attached drawings, the bed-of-nails module is shown in Figure 2(c) of the attached drawings, and the fixture frame is shown in Figure 2(d) of the attached drawings. The bed-of-nails module includes: a bed-of-nails, a pressure plate, a press pin, and a positioning pin. The fixture frame includes: a fixture power supply box, a motor forward and reverse controller, a wire, a printed circuit board plug docking, a BNC plug, and a power switch.

[0042] Each test fixture module corresponds to a type of circuit board. Multiple circuit boards can be tested simultaneously by means of panelized boards. At the bed-of-nails, the positioning pins can be switched to meet the testing requirements for multiple types of circuit boards (single-board, two-panel, four-panel, etc.). The test points on the printed circuit board correspond one-to-one with the positioning points on the fixture module.

[0043] The main function of the test fixture module is to connect the test points on the printed circuit board. Place the printed circuit board on the bed-of-nails and fix it with positioning pins (confirm that the direction is the only direction). After starting the test fixture, the pressure plate and the positioning pins fix the printed circuit board on the bed-of-nails. The signal points (+5V, -5V, GND, FB, etc.) to be measured on the printed circuit board are collected by the pressure pins pressing on the solder joints (note that when using the pressure pins, do not damage the chip solder joints and via pads). One end of the pressure pin is connected to the signal point and the other end is connected to a wire, and the other end of the wire is docked with the printed circuit board plug. Among them, the measurement wires for measuring ripple and collecting waveforms are docked with BNC plugs, and the wires are stored in the fixture frame. The programmer and the programming drive circuit are connected by a flat cable to enhance the programming signal and ensure normal reception of the programming signals for multiple circuit boards. After the test fixture needle board is pressed down, see the attachment Figure 3 as shown. The resistance value knob is added as required during the test.

[0044] There is power supply control in the fixture power supply box. The test fixture module is docked with the operation console module through a cable module. After turning on the power, 220V voltage is introduced into the fixture power supply box through the cable module. The fixture power supply box supplies 220V power to the test fixture. The fixture power supply box has a conversion module to identify the voltage on the programmable power supply and supply power to the printed circuit board and the programming drive circuit.

[0045] The operation console module includes a tabletop frame, a document storage area, an idle fixture storage area, an equipment storage area, a knob arm, a display, and a power switch. The equipment storage area is shown in the attachment Figure 7 as shown. The equipment storage area includes: a PXI host, a relay board, a multimeter, a programmable power supply, a multiplexer, an operation console power supply box, a terminal board, and an oscilloscope.

[0046] The programmable power supply controls the power supply to the circuit board on the test fixture; the operation console power supply box converts 220V power to supply power to the multiplexer; the relay board is connected to the probe fixture through a cable assembly to control the on / off of each group of resistance, voltage, and current; the multiplexer controls the on / off of the relays on the relay board to maximize the use of the relay board. The PXI host is connected to the terminal board by a wire to achieve the switching function between circuit boards.

[0047] The oscilloscope is placed at a 45° angle above the diagonal. The tabletop is inlaid with high-definition tempered glass, which is convenient for viewing the oscilloscope, provides convenience for the troubleshooting process, and saves internal space at the same time.

[0048] The operating table for placing the test fixture is equipped with an anti-static table mat that is grounded, and there is an anti-static bracelet connection port under the table mat to achieve the function of anti-static protection for the printed circuit board and possess the ability to operate anti-static.

[0049] The software module controls the entire automated test system for the gyro circuit board. The software of this function test system is developed on LabVIEW 2015 and adopts a modular and platform-based software design for easy operation.

[0050] The general function system software is a software group with a good Windows graphical interface, which is easy to operate and use and realizes dynamic and static function tests. The software system mainly consists of a test module, a statistical module, and a driver module. The software uses password control for two levels of permissions for easy hierarchical management.

[0051] The software interface configuration should conform to the attachment Figure 10 As shown, after logging in to the interface, enter the model selection - product selection - process selection, and the corresponding test timing will appear. The model, product type, and process of the product can be configured by oneself, and the test timing can be selected according to the test requirements. This software module already covers all test items for the gyro circuit board.

[0052] To achieve the universality of the operation table module, the definition of the aviation plug of the operation table module remains unchanged. If there is no special fixture for the printed circuit board to be tested, it is necessary to make a cable corresponding to the dot number or use a wire connection.

[0053] The gyro circuit board test includes constant current source test, communication test, etc. It is necessary to increase the corresponding resistance value and algorithm at the fixture end for operation (as shown in Table 1). The test module controls equipment such as switch boards, switch boxes, probe fixtures, multimeters, filters, etc., to make the test dot numbers correspond to the test items; the statistical module sorts out, performs algorithm operations, and interprets the data during the test process to form reports, etc.; the driver module is to meet the automatic programming function for multiple circuit boards. Since one programmer cannot meet the simultaneous use of multiple circuit boards on one machine, a drive circuit is added to the test fixture module - detection board to form a daisy chain, and the programming signal is enhanced to program the circuit boards sequentially using one programmer.

[0054] Table 1

[0055] Circuit board test calculation items:

[0056]

[0057] Other matters to note:

[0058] 1. Regarding the value of I in the constant current source test 0 of, I 0= (10 μA × (R9 + R16) / 2.4); where the value of (R9 + R16) will vary. The value of (R9 + R16) is the same in 90% of cases. If there is a change, it is a batch replacement.

[0059] The cable module has three parts. The first part is the test fixture part, the wiring of the probe and the aviation plug. The second part is the wiring for the aviation plug connection between the operation console module and the test fixture module. The third part is the wiring for the internal power supply and electrical connection of the test bench.

[0060] Specific operation method:

[0061] There are four buttons on the front of the test fixture module, including emergency stop, up, and two down presses. During operation, press the "down press" buttons with both hands simultaneously for 1 - 2 s, and the test fixture module contacts the printed circuit board. The test fixture module and the printed circuit board are docked with an anti-misinsertion function. There is only one installation direction to prevent damage to the circuit board caused by incorrect dot numbers. The "emergency stop" button acts on the test fixture module. During the pressing process, or when it is found that the printed circuit board is not placed flat, etc., the emergency stop button is needed to cut off the power supply of the test fixture.

[0062] After turning on the power at the test bench switch, place the used test fixture on the upper operation table surface and place the idle fixture in the idle fixture storage area. Use the docking cable. One end of the cable is docked with the printed circuit board plug at the back of the fixture module, and the other end is docked with the connector on the operation table surface. The BNC ports correspond one by one. After the cable docking is completed correctly, place the printed circuit board on the test pin board. After confirming the correct placement direction, turn on the switch of the fixture module and click the "down press" button. After the printed circuit board is fixed, see the attachment Figure 3 as shown.

[0063] Turn on the switch button on the operation table surface of the operation console module. The monitor, multimeter, and PXI host are directly powered on. Use the roller beside the keyboard on the operation table surface to control the monitor, open the test software, and select the required functions.

[0064] The present invention designs an automated test system for gyro circuit boards, mainly composed of a test fixture module, an operation console module, a software module, and a cable module. It can simultaneously perform tests on multiple gyro circuit boards and meet the requirements of automated testing for gyro circuit boards (detection circuit boards, light source circuit boards);

[0065] The present invention can perform tests on test items such as voltage, current, and ripple, and has the ability to automatically interpret parameters and generate reports;

[0066] The present invention can achieve automated circuit board testing, automatic data acquisition and storage, and has an upload interface;

[0067] During the testing process of the present invention, the testing system is conveniently connected. The circuit board is placed on the tooling module, and the tooling module is docked with the test bench using an aviation cable, without the need for manual calibration and other operations;

[0068] The present invention can be adapted to measure multiple circuit boards of the same type.

[0069] The effects of the present invention are as follows:

[0070] The present invention designs an automatic testing system for gyro circuit boards, which can simultaneously meet the requirements of automatic testing of multiple circuit boards, and can satisfy functions such as automatic data acquisition, interpretation, storage, and uploading;

[0071] The operation process of the printed circuit board welding test line is avoided;

[0072] It adapts to the mass production efficiency, improves the circuit board testing efficiency, and can reduce errors caused by factors such as instruments and humans.

[0073] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of the present technology, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An automatic testing system for gyro circuit boards, characterized in that, the system includes a test fixture module, an operating table module, a software module and a cable module; The test fixture module is divided into two types according to different test items of two circuit boards, namely, the fixture module - light source board and the fixture module - detection board; The test fixture module - light source board includes a bed-of-nails module, a fixture frame and a resistance knob; The test fixture module - detection board includes a bed-of-nails module, a fixture frame, a programmer and a programming drive circuit; The bed-of-nails module includes: a bed-of-nails, a pressing plate, pressing pins and positioning pins; The fixture frame includes: a fixture power supply box, a motor forward and reverse controller, wires, printed circuit board plug docking, BNC plugs and a power switch; The test fixture module is used to connect the test points on the printed circuit board; Place the printed circuit board on the bed-of-nails and fix it with positioning pins. After starting the test fixture, the pressing plate and the positioning pins fix the printed circuit board on the bed-of-nails. The signal points to be measured on the printed circuit board are collected through the pressing pins pressing on the solder joints. One end of the pressing pin is connected to the signal point and the other end is connected to the wire. The other end of the wire is connected to the printed circuit board plug docking. Among them, the measurement lines for measuring ripple and collecting waveforms are connected to the BNC plugs, and the wires are stored in the fixture frame; The programmer and the programming drive circuit are connected by a ribbon cable; The operating table module includes a tabletop frame, a file storage area, an idle fixture storage area, an equipment storage area, a knob arm, a display and a power switch; The equipment storage area includes: a PXI host, a relay board, a multimeter, a programmable power supply, a multiplexer, an operating table power supply box, a terminal board and an oscilloscope; The software module controls the entire automatic testing system for gyro circuit boards. It is developed on LabVIEW 2015 and adopts a modular and platform-based software design. The software system includes: a test module, a statistics module and a drive module. The software uses password control for two levels of permissions; The cable module has three parts. The first part is the wiring of the probe and the aviation plug in the test fixture part; The second part is the wiring for the aviation plug docking between the operating table module and the test fixture module; The third part is the wiring for the internal power supply and electrical connection of the test bench.

2. The automatic testing system for gyro circuit boards according to claim 1, characterized in that, each test fixture module corresponds to a kind of circuit board. The circuit boards are tested simultaneously for multiple circuit boards by means of a panelized board. By changing the positioning pins at the bed-of-nails, it is possible to meet the test requirements for single-board, two-panel or four-panel circuit boards.

3. The automatic testing system for gyro circuit boards according to claim 2, characterized in that, There is power supply control in the fixture power supply box. The test fixture module is docked with the operating table module through the cable module. After turning on the power, 220V voltage is introduced into the fixture power supply box through the cable module. The fixture power supply box supplies 220V power to the test fixture. The fixture power supply box has a conversion module to identify the voltage on the programmable power supply to supply power to the printed circuit board and the programming drive circuit.

4. The automatic testing system for gyro circuit boards according to claim 1, characterized in that, The circuit board on the programmable power supply control test fixture is powered; the power supply box on the operating table converts 220V power supply to power the multiplexer switch; the relay board and the probe fixture are connected through a cable assembly to control the on / off of each group of resistors, voltages, and currents; the multiplexer switch controls the on / off of the relays on the relay board to maximize the use of the relay board. The PXI host and the terminal board are connected by wires to achieve the switching function between circuit boards.

5. The gyro circuit board automatic test system according to claim 4, characterized in that, The oscilloscope is placed at a 45° angle above the slope. The tabletop is inlaid with high-definition tempered glass, which is convenient for viewing the oscilloscope, provides convenience for the troubleshooting process, and saves internal space at the same time.

6. The gyro circuit board automatic test system according to claim 4, characterized in that, The operating table for placing the test fixture is provided with an anti-static table mat and is grounded. An anti-static bracelet connection port is provided under the table mat to achieve the function of anti-static protection for the printed circuit board and have the ability to operate anti-static.

7. The gyro circuit board automatic test system according to claim 1, characterized in that, After logging in to the software interface, enter the model selection - product selection - process selection, and then the corresponding test timing appears. The model, product type, and process of the product are configured by oneself, and the test timing is selected according to the test requirements. The software module covers all gyro circuit board test items.

8. The gyro circuit board automatic test system according to claim 7, characterized in that, The definition of the aviation plug of the operating table module remains unchanged. If there is no special fixture for the printed circuit board to be tested, it is necessary to make a cable with corresponding dot numbers or connect it with wires.

9. The gyro circuit board automatic test system according to claim 7, characterized in that, The gyro circuit board test includes constant current source test and communication test. It is necessary to increase the corresponding resistance value and algorithm at the fixture end for operation. The test module controls the switch board, switch box, probe fixture, multimeter, and filter to make the test dot number correspond to the test item; the statistical module sorts out the data in the test process, performs algorithm operations and interpretations, and forms a report; the drive module is to meet the automatic programming function for multiple circuit boards; since one programmer does not meet the requirement of using multiple circuit boards on one machine at the same time, a drive circuit is added to the test fixture module - detection board to form a daisy chain, and the programming signal is enhanced to program the circuit boards in turn using one programmer.

10. The gyro circuit board automatic test system according to any one of claims 1-9, characterized in that, There are four buttons on the front of the test fixture module, including emergency stop, up, and two down presses. During operation, press the "down press" with both hands for 1-2 seconds at the same time, and the test fixture module contacts the printed circuit board; the test fixture module and the printed circuit board are docked with an anti-misinsertion function, and there is only a unique installation direction to prevent damage to the circuit board caused by incorrect dot numbers; the "emergency stop" button acts on the test fixture module. During the pressing process, or when it is found that the printed circuit board is not placed flat, the emergency stop button is required to cut off the power supply of the test fixture; after turning on the power supply at the test bench switch, place the used test fixture on the upper operating table surface and place the idle fixture in the idle fixture storage area. Use a docking cable. One end of the cable is docked with the docking part of the printed circuit board plug behind the tooling module, and the other end is docked with the connector on the operating table surface. The BNC ports correspond one by one. After the cable docking is completed correctly, place the printed circuit board on the test pin board. After confirming that the placement direction is correct, turn on the switch of the tooling module and click the "Press Down" button to fix the printed circuit board. Turn on the switch button on the operating table surface of the operating table module. The monitor, multimeter, and PXI host are directly powered on. Use the roller beside the keyboard on the operating table surface to control the monitor, open the test software, and select the required functions.

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