CN213181907U

CN213181907U - PCBA test fixture and test system

Info

Publication number: CN213181907U
Application number: CN202022219880.5U
Authority: CN
Inventors: 林俊杰; 罗子龙; 严振航; 吴振志; 吴涵渠
Original assignee: Shenzhen Aoto Electronics Co Ltd
Current assignee: Shenzhen Aoto Electronics Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-05-11
Anticipated expiration: 2030-09-30

Abstract

The utility model is suitable for a PCB test field provides a PCBA test fixture and test system. The test tool is provided with a plug interface and also comprises an FPGA which is internally provided with a plurality of detection programs and is used for detecting a waveform signal to be detected received by the plug interface by using the selected detection program; the detection result output unit is connected with the FPGA and used for outputting the detection result of the FPGA; the detection program selection unit is connected with the FPGA and is used for selecting the detection program required to be used; the test starting unit is connected with the FPGA and used for triggering the FPGA to start a test in a controlled manner; and the controlled end of the switch circuit is connected with the FPGA, the first end of the switch circuit is connected with the power supply, the second end of the switch circuit is connected to the socket and is closed under the control of the FPGA starting signal, so that the power supply supplies power to the PCBA to be detected through the socket. The utility model provides a PCBA test fixture can the various types of PCBA that awaits measuring of adaptation, realizes a tractor serves several purposes, has reduced PCBA's test cost and maintenance cost.

Description

PCBA test fixture and test system

Technical Field

The utility model belongs to PCB test field especially relates to a PCBA test fixture and test system.

Background

A PCB (Printed Circuit Board assembly), i.e., a finished Board assembled by a PCB (Printed Circuit Board) through other processes, in short, a PCB Board with electronic components soldered thereto. After the PCBA is assembled, the performance of the PCBA needs to be tested, so that the PCBA is prevented from being broken down due to the fact that electronic components are wrong, leaked, reversed, short, virtual and the like in the manufacturing process, and whether the PCBA is qualified or not is determined.

With the development of the electronic manufacturing industry, various test tools for a single PCBA are designed to improve the test efficiency of the PCBA. The tools mainly comprise test software, a master control MCU, a computer, a test circuit and the like.

The general test tool has the following use steps: the user sends a test command to the main control MCU through the computer, and the test software in the main control MCU sends a functional test instruction to the PCBA to be tested after receiving the test command of the user. The PCBA to be tested is reserved with power supply test points and test contact points of all the functional modules, and the test tool is in contact with the test contact points on the PCBA through the test probes to provide electric energy, so that a test circuit is formed, and the functional modules are tested. The PCBA responds after receiving the function test instruction, and returns the test information and the test result of the function module through the probe. The tool can cover the full-function test of hardware and can replace manual batch test; the test flow is simplified, only the PCBA needs to be manually installed on the tool, and the tool can be waited to finish the test by sending a test command, so that the test efficiency in the production process is improved; meanwhile, the use of the tool reduces the hardware failure rate of the factory product, and also reduces the labor cost and the time cost.

However, this test method determines that a single test fixture is only suitable for testing a single type of PCBA, and is not compatible with other types of PCBA. This means that in the prior art, when designing a test fixture for multiple PCBA, each PCBA needs to be designed separately, which increases the complexity and design cost in the stage of designing the test fixture, and the more PCBA tested, the higher the design cost and the higher the maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is PCBA's test cost for how to reduce PCBA, aims at accomplishing the PCBA of a test fixture tractor serves several purposes, compatible test different grade type.

For solving above-mentioned technical problem, the first aspect, the utility model provides a PCBA test fixture, PCBA test fixture is equipped with the interface, still includes:

the FPGA is internally provided with various detection programs and is used for detecting the waveform signal to be detected received by the interface by utilizing the selected detection program;

the detection result output unit is connected with the FPGA and used for outputting the detection result of the FPGA;

the detection program selection unit is connected with the FPGA and is used for selecting a detection program required to be used;

the test starting unit is connected with the FPGA and used for controlling and triggering the FPGA to start a test;

and the controlled end of the switch circuit is connected with the FPGA, the first end of the switch circuit is connected with a power supply, the second end of the switch circuit is connected to the socket and is closed under the control of the FPGA starting signal, so that the power supply supplies power to the PCBA to be tested through the socket.

Further, the interface includes a waveform signal transmission line and a power supply line.

Further, the detection result output unit is a display screen.

Further, the detection program selection unit is a key assembly.

Furthermore, the test starting unit is a key assembly.

In a second aspect, the utility model also provides a PCBA test system, a serial communication port, include:

the PCBA test fixture of the first aspect; and

the first ends of different adapter plates are provided with different first insertion ports, and the second ends of the different adapter plates are provided with second insertion ports matched with the insertion ports of the FPGA;

the first socket of each adapter plate is matched with various types of PCBAs to be tested; the power supply sequentially passes through the switch circuit, the plug interface, the second plug interface and the first plug interface to supply power to the PCBA to be detected, and the PCBA to be detected sequentially passes through the first plug interface, the second plug interface and the plug interface to send a waveform signal to be detected to the FPGA after the PCBA to be detected obtains an electricity loading program.

Compared with the prior art, the utility model, PCBA test fixture is fixed unchangeable, only need in the FPGA of PCBA test fixture the built-in detection procedure that needs to use can, the keysets with the various PCBA adaptations that await measuring, can control the FPGA in the PCBA that awaits measuring on PCBA test fixture and get electric the loading procedure and send and wait to examine the waveform signal, finally accomplish by the FPGA of PCBA test fixture and detect. It can be seen that the utility model provides a PCBA test fixture can the various types of PCBA that await measuring of adaptation, realizes a tractor serves several purposes, has reduced PCBA's test cost and maintenance cost.

Drawings

Fig. 1 is a structural diagram of a PCBA test fixture according to a first embodiment of the present invention;

fig. 2 is a structural diagram of a PCBA test system according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows the structure of the PCBA test fixture provided by the first embodiment of the present invention, which is particularly suitable for the PCBA of the scan card that outputs signals through the gold finger and the multi-PIN seat.

Referring to fig. 1, the PCBA test fixture 1 includes a socket 11, an FPGA (Field Programmable Gate Array) 12, a detection result output unit 13, a detection program selection unit 14, a test start unit 15, and a switch circuit 16. The FPGA12 has various detection programs built therein, and is configured to detect a waveform signal to be detected received by the plug interface 11 by using a selected detection program. For a PCBA (printed circuit board assembly) of a scanning card which outputs signals through a golden finger and multiple PIN seats, each PIN outputs a waveform signal to be detected, the FPGA12 needs to detect the waveform signal of each PIN, and if the waveform signal output by a certain PIN does not accord with a preset standard waveform signal, the problem of the golden finger PIN corresponding to the PIN can be judged.

The detection result output unit 13 is connected to the FPGA12, and is configured to output the detection result of the FPGA12, which may be implemented by using a display screen, for example, a 2 × 8LCD screen. If the transmission waveform does not conform to the preset standard, the FPGA12 outputs the pin number corresponding to the waveform to the LCD screen for display, and if the transmission waveform does not conform to the preset standard, the OK word is displayed on the LCD screen. The detection result output unit 13 may also adopt other indicating devices, such as a signal indicating lamp with a multi-color display function, which respectively represent different situations of success, failure, etc. by using different colors of light, and may also adopt an audible alarm to output different sounds to represent different detection results.

The detection program selecting unit 14 is connected to the FPGA12 for selecting the detection program to be used. The detection program selection unit 14 may be implemented by a key assembly connected to an input pin of the FPGA12, or by a touch screen unit, where selectable detection programs are displayed on the touch screen for manual selection, and when a user touches a screen area corresponding to a target detection program, the selection may be completed.

The test starting unit 15 is connected with the FPGA12 and is used for controlled triggering of the FPGA12 to start a test. The test enable unit 15 may also be implemented using a key assembly connected to an input pin of the FPGA12, and the FPGA12 generates an enable signal when the test enable unit 15 triggers the FPGA12 to enable testing. Similarly, the test starting unit 15 may also be implemented by a touch screen unit, an icon representing the test starting unit 15 is displayed on the touch screen, and when the user touches the icon, the selection can be completed.

The controlled end of the switch circuit 16 is connected with the FPGA12, the first end is connected with the 5V power supply, the second end is connected to the socket 11 and is closed under the control of the FPGA12 starting signal, so that the 5V power supply supplies power to the PCBA to be tested through the socket 11.

As can be seen from the above description, the socket 11 includes a waveform signal transmission line and a power supply line, wherein the waveform signal transmission line is used for transmitting an input waveform signal, and the power supply line is used for supplying power to the PCBA to be tested from the 5V power supply.

On the basis of the first embodiment, fig. 2 shows the structure of a PCBA test system provided by the second embodiment of the present invention, which includes:

the PCBA test tool 1 and the at least one interposer 2 according to the first embodiment are different in that the first end of different interposers 2 has different first sockets 21, and the second end has a second socket 22 that is adapted to the socket 11 of the FPGA 12.

The first socket 21 of each adapter plate 2 is adapted to various types of PCBAs 3 to be tested, and the adapter plate 2 with the corresponding first socket 21 is selected according to the type of the PCBAs 3 to be tested during testing.

During testing, the 5V power supply sequentially passes through the switch circuit 16, the socket 11, the second socket 22 and the first socket 21 to supply power to the PCBA3 to be tested, the PCBA3 to be tested automatically generates corresponding waveform signals after being electrified and loaded with a program, and the FPGA of the PCBA3 to be tested can generate different waveforms between two adjacent pins according to the position of a gold finger or a plurality of PI N seats, so that the influence on a test result due to short circuit is prevented. The generated waveform signal sequentially passes through the first interface 21, the second interface 22 and the interface 11 to send a waveform signal to be detected to the FPGA 12.

With reference to fig. 1 and 2, the whole testing process is illustrated as follows:

1. according to the difference of the PCBA3 (such as a scanning card) interface to be tested, the adapter plate 2 with the corresponding first interface 21 is selected so as to be inserted on the PCBA test tool 1 to play a role of a conversion interface.

2. The PCBA test tool 1 is connected to a 5V power supply and powered on, a test program of a scanning card to be tested is selected on the 2 x 8LCD dot matrix screen through the detection program selection unit 14, and the PCBA3 to be tested is inserted into the PCBA test tool 1 through the adapter plate 2. The test starting unit 15 is pressed down, the IO corresponding to the FPGA12 detects that the pin is pulled down, the IO is controlled to output a high level, the switch circuit 16 controls the 5V power supply of the PCBA3 to be tested to be conducted, the PCBA3 to be tested is electrified with a loading program, and the FPGA12 controls the test number displayed by the 2 x 8LCD dot matrix screen to be added by 1.

3. The PCBA3 to be detected sends a waveform to be detected to the FPGA12 through the adapter plate 2, the FPGA12 detects whether a waveform signal sent by each pin of the PCBA3 to be detected is qualified, if so, a character string 'OK' is displayed on a 2-8 LCD dot matrix screen, otherwise, the FPGA12 outputs a pin number corresponding to the waveform to the 2-8 LCD dot matrix screen for display.

4. After the test is finished, the FPGA12 controls the IO to output low level, the 5V power supply of the PCBA3 to be tested is automatically disconnected, and the PCBA3 to be tested is powered down. And pulling out the PCBA3 to be tested, replacing the other PCBA3 to be tested, and repeating the steps for testing.

To sum up, the utility model provides a PCBA test fixture is fixed unchangeable, only need in the FPGA of PCBA test fixture the built-in detection procedure that needs to use can, the keysets with the various PCBA adaptations that await measuring of reunion, can control the FPGA in the PCBA that awaits measuring on PCBA test fixture and get electric the loading procedure and send and wait to examine the waveform signal, finally accomplish by the FPGA of PCBA test fixture and detect. It can be seen that the utility model provides a PCBA test fixture can the various types of PCBA that awaits measuring of adaptation, realizes a tractor serves several purposes, has reduced PCBA's test cost and maintenance cost to all connect through the grafting mode between PCBA, keysets, the test fixture that awaits measuring, make to connect more reliably, improved the stability and the security of test, the interference killing feature is stronger, and data processing is simple.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a PCBA test fixture, its characterized in that, PCBA test fixture is equipped with the interface, still includes:

2. The PCBA test fixture as in claim 1, wherein the socket includes a waveform signal transmission line and a power supply line.

3. The PCBA test tool according to claim 1 or 2, wherein the detection result output unit is a display screen.

4. The PCBA test tool according to claim 1 or 2, wherein the detection result output unit is a signal indicator lamp with a multi-color display function.

5. The PCBA test tool according to claim 1 or claim 2, wherein the detection result output unit is an audible alarm.

6. The PCBA test fixture of claim 1 or 2, wherein the detection program selection element is a key assembly.

7. The PCBA test tool of claim 1 or 2, wherein the detection program selection element is a touch screen element.

8. A PCBA test fixture according to claim 1 or 2, in which the test initiation element is a key assembly.

9. The PCBA test tool as claimed in claim 1 or claim 2, wherein the test initiation unit is a touch screen unit.

10. A PCBA test system, comprising:

the PCBA test fixture as recited in any of claims 1-9; and