PCB test platform

Abstract

The invention discloses a PCB (printed circuit board) test platform, and particularly relates to the technical field of PCB testing, the PCB test platform comprises a test tool, a test box and an industrial personal computer, the test tool is mainly responsible for fixing a tested PCB and providing a working power supply for the tested PCB, and a signal transmitted by the test box is received through an adapter plate and is transmitted to a corresponding tested point of the tested PCB through a test probe. According to the PCB test platform, through combination of the industrial personal computer board card and the test tool and communication between the upper computer and the test signal, automatic PCB detection is achieved, the automation degree is high, operation can be conducted only with little manpower, the labor cost of an enterprise is greatly reduced, the provided test platform does not need to test the PCB manually, and the test efficiency is improved. And the test result does not need to be judged by a tester according to the test parameters, but is completed by the test platform according to the test program, so that the test process is relatively simple and convenient, the possibility of misjudgment or misoperation does not exist, the test efficiency is high, and the accuracy of the test result is high.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB testing, and in particular to a PCB testing platform. Background Art

[0002] With the development of circuit technology, PCB can realize multiple functions, such as using PCB to manufacture global positioning system (GPS) equipment for positioning, etc. When a PCB that realizes a certain function is manufactured, it is necessary to test the manufactured PCB to determine whether it meets the design standards based on the parameters obtained from the test.

[0003] During the testing process of printed circuit boards (PCBs), in order to enable PCBs to achieve certain specific functions, especially in the field of electronic control, which often include analog-to-digital conversion (ADC) sampling, digital input and output (DIO) control, and pulse width modulation (PWM) square wave output, in addition to hardware problems, software functions need to be added to test the completeness and correctness of the above functions. The existing testing and observation of PCB functions are still mainly done manually, and the functionality of the PCB is often tested by manually adding current and voltage to the corresponding pins of the tested board, which has the problems of low efficiency, labor and time. Summary of the invention

[0004] The main purpose of the present invention is to provide a PCB testing platform, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A PCB test platform comprises a test fixture, a test box and an industrial computer, wherein the test fixture is mainly responsible for fixing a PCB board under test and providing a working power supply for the PCB board under test, receiving a signal from the test box through an adapter board and transmitting the signal to a corresponding test point of the PCB board under test through a test probe; the test box is mainly responsible for controlling a conditioning test board to generate different test signals through a control button, receiving a DIO control signal from the industrial computer, and transmitting the test signal and the DIO control signal to the test fixture; the industrial computer is mainly responsible for issuing a DIO control command, communicating with the PCB board under test and displaying the test result.

[0007] Preferably, the test tooling comprises a workbench, a pressing plate and a PCB board to be tested, wherein a frame is fixedly installed in the middle of the upper end of the workbench, and the frame comprises two side panels, and the two side panels are respectively fixedly installed on the left and right sides of the upper end of the workbench, and a support plate is fixedly installed on the upper part between the two side panels, and a template is fixedly installed on the upper end of the test tooling, and the template is located between the two side panels, and a limiting groove is provided in the middle of the upper end of the template, and the PCB board to be tested is installed in the limiting groove, and a quick clamp is fixedly installed at the front end of the support plate, and fixing plates are fixedly installed on the left and right sides of the front and rear ends of the support plate, and a guide column is fixedly installed at the bottom of the fixing plate, and through holes are provided at the four corners of the upper end of the pressing plate, and the bottom of the guide column passes through the through holes and is fixedly connected to the upper end of the workbench, and a number of fixed pillars are fixedly installed at the bottom of the pressing plate, and the quick clamp comprises a handle and a driving arm, and the bottom of the driving arm is fixedly connected to the pressing plate, and the handle is pulled to drive the driving arm to move downward, and the pressing plate is driven to move downward along the surface of the guide column.

[0008] Preferably, a test probe and a PCB power supply are arranged inside the workbench, the PCB power supply can supply power to the PCB board under test, and the test probe can be connected to the test point on the PCB board under test.

[0009] Preferably, a PCB power socket is installed on the back of the workbench, a transfer plate is installed on the right side of the workbench, and a power switch button is installed on the left side of the top of the workbench.

[0010] Preferably, the test box includes a box body, an air switch, a control button and a conditioning test board are arranged on the upper end of the box body, and the conditioning test board can generate the test signal required by the tested PCB board through the designed hardware topology, and the test signal can be an ADC sampling signal or a DIO control signal.

[0011] Preferably, the industrial computer includes a chassis and a host computer, a handle is installed on the front of the chassis, a heat dissipation port and an interface are provided on the side of the chassis, a PCI board is provided in the chassis, the PCI board has a multi-channel counter and a multi-channel DIO control function, the counter function can sample a PWM signal, and the host computer is equipped with monitoring background software, and the monitoring background software can control the issuance of DIO commands, display PWM waveforms, and display ADC sampling results in real time.

[0012] Preferably, the PCB board under test can communicate data with the industrial computer via RS485 communication or RS232 communication.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The invention discloses a PCB testing platform. Through the combination of an industrial computer board and a testing tool, and the communication between a host computer and a test signal, automatic PCB detection is realized. The automation degree is high, and only very little manpower is required to operate, which greatly reduces the labor cost of an enterprise. The provided testing platform does not require manual testing of the PCB, and the test result does not require the tester to judge according to the test parameters, but is completed by the testing platform according to the test program. Therefore, the testing process is relatively simple, there is no possibility of misjudgment or misoperation, and the testing efficiency is high and the test result accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the test tool of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the test box of the present invention;

[0018] Figure 4 It is a structural schematic diagram of the industrial computer of the present invention;

[0019] Figure 5 It is a flow chart of the method for testing PCB of the present invention;

[0020] Figure 6 It is a PWM waveform interface diagram of the monitoring background software of the industrial computer of the present invention;

[0021] Figure 7 This is an ADC sampling result interface diagram of the monitoring background software of the industrial computer of the present invention;

[0022] Figure 8 This is a diagram of the DIO control command interface of the monitoring background software of the industrial computer of the present invention.

[0023] In the figure: 1. test tooling; 2. test box; 3. industrial computer; 11. workbench; 12. frame; 121. side panel; 122. support plate; 13. fixing plate; 14. guide column; 15. pressing plate; 16. fixing pillar; 17. template; 18. limit slot; 19. power switch button; 110. PCB board under test; 111. quick clamp; 151. through hole; 21. box; 22. air switch; 23. control button; 24. conditioning test board; 31. chassis; 32. handle; 33. heat dissipation vent; 34. interface. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0025] Embodiment 1

[0026] like Figure 1-4 As shown, a PCB test platform includes a test fixture 1, a test box 2 and an industrial computer 3, wherein the test fixture 1 is mainly responsible for fixing the PCB board 110 under test and providing it with a working power supply, receiving the signal from the test box 2 through the adapter board and transmitting it to the corresponding test point of the PCB board 110 under test through the test probe; the test box 2 is mainly responsible for controlling the test board 24 to generate different test signals through the control button 23, receiving the DIO control signal from the industrial computer 3, and transmitting the test signal and the DIO control signal to the test fixture 1; the industrial computer 3 is mainly responsible for issuing the DIO control command and communicating with the PCB board 110 under test and displaying the test result.

[0027] The test fixture 1 includes a workbench 11, a pressing plate 15 and a PCB board 110 to be tested. A frame 12 is fixedly installed in the middle of the upper end of the workbench 11. The frame 12 includes two side panels 121, which are respectively fixedly installed on the left and right sides of the upper end of the workbench 11. A support plate 122 is fixedly installed on the upper part between the two side panels 121. A template 17 is fixedly installed on the upper end of the test fixture 1. The template 17 is located between the two side panels 121. A limiting groove 18 is provided in the middle of the upper end of the template 17. The PCB board 110 to be tested is installed in the limiting groove 18. A quick clamp 11 is fixedly installed at the front end of the support plate 122. 1, the left and right sides of the front and rear ends of the support plate 122 are fixedly installed with fixing plates 13, the bottom of the fixing plate 13 is fixedly installed with a guide column 14, the four corners of the upper end of the pressing plate 15 are opened with through holes 151, the bottom of the guide column 14 passes through the through holes 151 and is fixedly connected to the upper end of the workbench 11, and a plurality of fixed pillars 16 are fixedly installed at the bottom of the pressing plate 15. The quick clamp 111 includes a handle and a driving arm, and the bottom of the driving arm is fixedly connected to the pressing plate 15. Pulling the handle drives the driving arm to move downward, drives the pressing plate 15 to move downward along the surface of the guide column 14, and then drives the fixed pillar to move downward, and presses and fixes the PCB board 110 under test.

[0028] A test probe and a PCB power supply are arranged inside the workbench 11. The PCB power supply can supply power to the PCB board 110 under test, and the test probe can be connected to the test point on the PCB board 110 under test. A PCB power socket is installed on the back of the workbench 11, an adapter board is installed on the right side of the workbench 11, and a power switch button 19 is installed on the top left side of the workbench 11.

[0029] The test box 2 includes a box body 21, and an air switch 22, a control button 23 and a test board 24 are arranged on the upper end of the box body 21. The test board 24 can generate the test signal required by the tested PCB board 110 through the designed hardware topology. The test signal can be an ADC sampling signal or a DIO control signal.

[0030] In this embodiment, the conditioning test board 24 includes a channel selection & relay drive module, a relay network module, a signal conditioning module, an analog-to-digital conversion ADC sampling conversion module and a data latch module, wherein the channel selection & relay drive module is used to switch the test channel to determine the test point according to the test program received from the industrial computer 3, test the determined test point to obtain a test signal, and drive the relay network module to input the obtained test signal into the signal conditioning module; the relay network module is used to input the test signal into the signal conditioning module under the drive of the channel selection & relay drive module; the signal conditioning module is used to adjust the received test signal, and send the test signal to the AD after adjusting the amplitude of the test signal to the ADC input range. C sampling and conversion module; ADC sampling and conversion module, used for receiving the adjusted test signal, performing analog-to-digital sampling conversion, and outputting a digital test signal to the data latch module; the data latch module, used for latching the digital test signal output by the received ADC sampling and conversion module and sending it to the industrial computer 3, or obtaining a test result based on the comparison between the digital test signal output by the received ADC sampling and conversion module and the test standard in the test program, and sending it to the industrial computer 3; the conditioning test board also includes an optical coupling isolation module, which is between the channel selection & relay drive module of the conditioning test board and the industrial computer, and is used for performing optical coupling isolation on the test program sent by the industrial computer 3 and then sending it to the channel selection & relay drive module of the conditioning test board.

[0031] The industrial computer 3 includes a chassis 31 and a host computer. A handle 32 is installed on the front of the chassis 31. A heat dissipation port 33 and an interface 34 are provided on the side of the chassis 31. A PCI board is provided in the chassis 31. The PCI board has a multi-channel counter and a multi-channel DIO control function. The counter function can sample a PWM signal. The host computer is equipped with a monitoring background software. The monitoring background software can control the issuance of DIO commands, display PWM waveforms, and display ADC sampling results in real time.

[0032] The PCB board 110 under test can communicate data with the industrial computer 3 via RS485 communication or RS232 communication.

[0033] Embodiment 2

[0034] In this embodiment, the PCB testing method process is shown in Figure 5As shown, the test software will be burned into the PCB board under test. The main controller (CPU) on the PCB board under test 110 can be a digital processor (DSP) or other central processing unit (such as ARM, etc.), which is mainly responsible for generating PWM waves, completing AD sampling calculations and transmitting them to the host computer through RS485 communication.

[0035] For example, in AD sampling, the conditioning test board generates an ADC sampling signal and transmits it to the PCB under test. After the CPU of the PCB under test processes the sampling signal, it sends it to the host computer through RS485 communication.

[0036] For example, in the DIO control signal, the host computer sends a DIO control instruction to the industrial computer PCI board to turn on the corresponding relay, the industrial computer 3 is connected to the conditioning test board 24 via the DB port, the conditioning test board 24 is connected to the corresponding dry / wet contacts on the PCB board 110 under test through the adapter board, the CPU corresponding interface of the PCB board 110 under test receives the DIO control signal, the corresponding register value will be updated and transmitted to the host computer via 485 communication as feedback that the DIO control command is successfully issued.

[0037] Embodiment 3

[0038] In this embodiment, the monitoring background software is shown in 6-8. The upper computer monitoring background software can be a laboratory virtual instrument engineering platform (LabVIEW) or other development graphical user interface programs (such as Qt, etc.), which can control the issuance of DIO commands, display PWM waveforms, and display ADC sampling results in real time.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A PCB testing platform, characterized in that: The invention comprises a test fixture (1), a test box (2) and an industrial computer (3), wherein the test fixture (1) is mainly responsible for fixing a PCB board (110) to be tested and providing a working power supply therefor, receiving a signal transmitted from the test box (2) through an adapter board and transmitting the signal to a corresponding tested point of the PCB board (110) to be tested through a test probe; the test box (2) is mainly responsible for controlling a conditioning test board (24) to generate different test signals through a control button (23), receiving a DIO control signal transmitted from the industrial computer (3), and transmitting the test signal and the DIO control signal to the test fixture (1); and the industrial computer (3) is mainly responsible for issuing a DIO control command, communicating with the PCB board (110) to be tested, and displaying the test result.

2. A PCB testing platform according to claim 1, characterized in that: The test fixture (1) comprises a workbench (11), a pressing plate (15) and a PCB board (110) to be tested. A frame (12) is fixedly mounted in the middle of the upper end of the workbench (11). The frame (12) comprises two side panels (121). The two side panels (121) are respectively fixedly mounted on the left and right sides of the upper end of the workbench (11). A support plate (122) is fixedly mounted on the upper part between the two side panels (121). A template (17) is fixedly mounted on the upper end of the test fixture (1). The template (17) is located between the two side panels (121). A limiting groove (18) is provided in the middle of the upper end of the template (17). The PCB board (110) to be tested is installed in the limiting groove (18). A quick clamp (111) is fixedly installed at the front end of the support plate (122), and a fixing plate (13) is fixedly installed on both the left and right sides of the front and rear ends of the support plate (122), and a guide column (14) is fixedly installed at the bottom of the fixing plate (13). Through holes (151) are opened at the four corners of the upper end of the pressing plate (15), and the bottom of the guide column (14) passes through the through holes (151) and is fixedly connected to the upper end of the workbench (11), and a plurality of fixed pillars (16) are fixedly installed at the bottom of the pressing plate (15). The quick clamp (111) includes a handle and a driving arm, and the bottom of the driving arm is fixedly connected to the pressing plate (15). When the handle is pulled, the driving arm moves downward, and the pressing plate (15) moves downward along the surface of the guide column (14).

3. A PCB testing platform according to claim 1, characterized in that: A test probe and a PCB power supply are arranged inside the workbench (11); the PCB power supply can supply power to the PCB board (110) under test, and the test probe can be connected to a test point on the PCB board (110) under test.

4. A PCB testing platform according to claim 1, characterized in that: A PCB power socket is installed on the back of the workbench (11), a transfer board is installed on the right side of the workbench (11), and a power switch button (19) is installed on the left side of the top of the workbench (11).

5. A PCB testing platform according to claim 1, characterized in that: The test box (2) comprises a box body (21), an air switch (22), a control button (23) and a conditioning test board (24) are arranged at the upper end of the box body (21), and the conditioning test board (24) can generate a test signal required by a tested PCB board (110) through a designed hardware topology, and the test signal can be an ADC sampling signal or a DIO control signal.

6. A PCB testing platform according to claim 1, characterized in that: The industrial computer (3) comprises a chassis (31) and a host computer. A handle (32) is installed at the front of the chassis (31). A heat dissipation port (33) and an interface (34) are arranged on the side of the chassis (31). A PCI board is arranged in the chassis (31). The PCI board has a multi-channel counter and a multi-channel DIO control function. The counter function can sample a PWM signal. The host computer is equipped with monitoring background software. The monitoring background software can control the issuance of DIO commands, display PWM waveforms, and display ADC sampling results in real time.

7. A PCB testing platform according to claim 1, characterized in that: The PCB board (110) under test can perform data communication with the industrial computer (3) via RS485 communication or RS232 communication.

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