Testing device, testing method and testing system for printed circuit board assembly

Abstract

The invention provides a testing device, a testing method and a testing system for a printed circuit board assembly, and belongs to the technical field of circuit testing. The test device is provided with the load simulation circuit used for simulating the load connected with the output power supply end of the PCBA, so that data processing equipment can perform reliable reliability test on the PCBA based on the voltage of the load simulation circuit acquired by the data acquisition system before the PCBA is assembled to an electronic product, namely, the PCBA can be tested in advance. Therefore, whether the electronic components in the PCBA fail or not can be found in time as early as possible, and the output process can be prevented from being affected.

Description

Technical Field

[0001] The present application relates to the technical field of circuit testing, and in particular to a testing device, a testing method and a testing system for a printed circuit board assembly. Background Art

[0002] Printed circuit board assembly (PCBA) is a component with specific functions that is obtained by assembling electronic components on a printed circuit board (PCB) through welding, SMT, etc. PCBA is often used in various electronic products (such as monitors) to drive the electronic products to work.

[0003] In the related art, considering that there are a large number of electronic components on the PCBA and that some of the electronic components may fail during long-term use, a portion of the PCBAs in the electronic products are usually selected for reliability testing (or aging testing) before the electronic products are mass-produced. That is, the various environments (such as high temperature and high humidity environments) and conditions that the PCBA may encounter during long-term use are simulated to perform aging tests on the PCBA in the electronic products, so as to facilitate early detection and replacement of failed electronic components.

[0004] However, the testing in the related technology takes a long time, which is not conducive to timely discovering the failure of electronic components and affects the production schedule. Summary of the invention

[0005] Provided are a testing device, a testing method and a testing system for a printed circuit board assembly, which can solve the problem in the related art that the long testing time makes it difficult to timely discover the failure of electronic components.

[0006] The technical solution is as follows:

[0007] On the one hand, a test device for a printed circuit board assembly (PCBA) is provided, wherein the PCBA has a plurality of output power terminals, and the plurality of output power terminals are used to connect a plurality of loads; the test device comprises: a plurality of load simulation circuits, a data acquisition system and a data processing device;

[0008] The plurality of load simulation circuits are connected to the plurality of output power supply terminals in a one-to-one correspondence, and each of the load simulation circuits is used to simulate a load connected to the corresponding output power supply terminal;

[0009] The data acquisition system is connected to the multiple load simulation lines and the data processing device respectively, and is used to collect the voltage on each of the load simulation lines when the PCBA outputs the power signal through the multiple output power terminals, and transmit the voltage on each of the load simulation lines to the data processing device;

[0010] The data processing device is used to test the PCBA based on the voltage on each load simulation line.

[0011] Optionally, each load simulation circuit includes: a first inductive resistor and a load resistor connected in series between the corresponding output power supply terminal and the ground terminal; for each load simulation circuit:

[0012] The data acquisition system is connected to both ends of the first sensing resistor and both ends of the load resistor respectively, and is used to collect the voltage across the first sensing resistor and the corresponding voltage between the output power supply terminal and the ground terminal;

[0013] The data processing device is used to determine the current on the load simulation circuit based on the voltage across the first sensing resistor, determine the voltage on the load simulation circuit based on the voltage between the output power terminal and the ground terminal, and test the PCBA based on the current and voltage on the load simulation circuit.

[0014] Optionally, for each of the load simulation lines: a resistance value of the load resistor is determined based on a voltage on the load simulation line divided by a current difference;

[0015] The current difference is the difference between the current on the load simulation circuit when the corresponding output power supply terminal is connected to the load and when the corresponding output power supply terminal is not connected to the load.

[0016] Optionally, the testing device further comprises: a power supply;

[0017] The power supply is connected to the PCBA and is used to provide a power signal and an enable signal to the PCBA, so that the PCBA outputs the power signal through the multiple output power terminals in response to the enable signal and the power signal.

[0018] Optionally, the PCBA further has an input power terminal for receiving the power signal;

[0019] The data acquisition system is also connected to the input power supply terminal and is used to collect the voltage on the input power supply terminal and transmit the voltage on the input power supply terminal to the data processing device;

[0020] The data processing device is further used to test the PCBA based on the voltage on the input power terminal.

[0021] Optionally, the testing device further comprises: an input sensing circuit;

[0022] The input sensing circuit is connected between the power supply and the PCBA;

[0023] The data acquisition system is also connected to the input sensing line and is used to acquire the voltage on the input sensing line and transmit the voltage on the input sensing line to the data processing device;

[0024] The data processing device is further configured to test the PCBA based on the voltage on the input sensing line.

[0025] Optionally, the input sensing circuit includes: a second sensing resistor connected in series between the power supply and the PCBA;

[0026] The data acquisition system is connected to both ends of the second sensing resistor and is used to collect the voltage across the two ends of the second sensing resistor;

[0027] The data processing device is used to determine the current on the input sensing line based on the voltage across the second sensing resistor, and to test the PCBA based on the current on the input sensing line.

[0028] Optionally, the data acquisition system is used to periodically collect voltage.

[0029] Optionally, the data acquisition system includes: a data acquisition card and a data collector which are sequentially connected between the multiple load simulation lines and the data processing device.

[0030] Optionally, the data processing device is further configured to issue an alarm if it detects that the voltage collected by the data collection system is abnormal.

[0031] Optionally, the data processing device includes: a computer.

[0032] Optionally, the load is a power circuit in a display.

[0033] Optionally, the testing device further includes: a testing fixture; the PCBA and the plurality of load simulation circuits are located in the testing fixture.

[0034] On the other hand, a PCBA testing method is provided, which is applied to a data processing device included in the testing device described in the first aspect above; the method comprises:

[0035] Acquire the voltage on each load simulation line, where the voltage on each load simulation line is acquired by the data acquisition system when the PCBA outputs power signals through multiple output power terminals;

[0036] The PCBA is tested based on the voltage on each of the load simulation lines.

[0037] In another aspect, a PCBA testing system is provided, the testing system comprising: a testing furnace, and the testing device as described in the above aspect;

[0038] The multiple load simulation circuits in the test device and the PCBA are placed in the test furnace, so as to allow the data acquisition system and data processing equipment in the test device to test the PCBA.

[0039] In summary, the beneficial effects brought about by the technical solution provided by this application may at least include:

[0040] A test device, a test method and a test system for a printed circuit board assembly are provided. Since a load simulation circuit for simulating a load connected to an output power supply terminal of a PCBA is provided in the test device, a data processing device can perform a reliable reliability test on the PCBA based on the voltage of the load simulation circuit collected by a data acquisition system before the PCBA is assembled into an electronic product, that is, the PCBA can be tested in advance. In this way, it is convenient to find out whether the electronic components in the PCBA have failed as early as possible, thereby avoiding affecting the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a structural schematic diagram of a PCBA testing device provided in an embodiment of the present application;

[0043] Figure 2 It is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0044] Figure 3 It is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0045] Figure 4 is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0046] Figure 5 is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0047] Figure 6 is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0048] Figure 7 is a structural schematic diagram of another PCBA testing device provided in an embodiment of the present application;

[0049] Figure 8 It is a flow chart of a PCBA testing method provided in an embodiment of the present application;

[0050] Fig. 9 It is a structural schematic diagram of a PCBA testing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0052] Take the electronic product display as an example. There are many electronic components (or components) on the PCBA of the display screen. In the operational reliability test (OP rel) after the display screen is assembled, component failure often occurs. Because the time from the output of the PCBA to the assembly of the screen is very long, and the time required for OP rel after the screen is assembled is even longer, it will lead to the failure of the components on the PCBA to be discovered in time, affecting the output schedule. Therefore, it is hoped that the PCBA can be powered on and OP rel is performed in advance before the screen is assembled. Although the PCBA of the display screen can run independently without the screen, it cannot effectively test the performance of the components because there is no load. It can be understood that, combined with the background records, OP rel here refers to a reliability test or aging experiment. It is mainly to select some products from many products as samples before the mass production of the product, and test the product by simulating various environments and working conditions that the product may encounter in actual use, so as to find potential problems in time before mass production and listing, and make corresponding improvements (such as repairing or replacing failed electronic components).

[0053] Based on this, considering the driving circuit architecture of the display screen and the fact that most failed components are concentrated on the power supply line, the embodiment of the present application designs a test device and a test method to add a load to the power supply line of the PCBA to simulate the working state of the PCBA with load, so as to perform OP rel of the PCBA in advance, i.e., pre-OP rel, so as to discover possible failure problems of components on the PCBA as early as possible.

[0054] Figure 1 A test device for a printed circuit board assembly (PCBA) is provided in an embodiment of the present application. First, refer to Figure 1It can be seen that the PCBA has a plurality of output power terminals V_OUT, and the plurality of output power terminals V_OUT are used to connect a plurality of loads.

[0055] For example, assuming that the PCBA is a PCBA of a display screen, the multiple loads may be power supply lines of a driving circuit structure of the display screen. The power supply lines may be, for example, lines where pull-up power supply lines AVDDP, AVDDN and / or pull-down power supply lines VGL2 are located. Figure 1 As shown, the multiple output power terminals V_OUT may include: an output power terminal V_OUT connected to AVDDP and used to provide a power signal to AVDDP, an output power terminal V_OUT connected to AVDDN and used to provide a power signal to AVDDN, and / or an output power terminal V_OUT connected to VGL2 and used to provide a required power signal to VGL2.

[0056] Continue to refer Figure 1 The test device includes: a plurality of load simulation lines 01, a data acquisition system (data management module, DMM) 02 and a data processing device 03.

[0057] Among them, multiple load simulation circuits 01 are connected to multiple output power terminals V_OUT in a one-to-one correspondence, and each load simulation circuit 01 is used to simulate the load connected to the corresponding output power terminal V_OUT. That is, for each output power terminal V_OUT on the PCBA, the load simulation circuit 01 connected to the output power terminal V_OUT can be used to simulate the load connected to the output power terminal V_OUT. For example, taking the output power terminal V_OUT as the output power terminal connected to the AVDDP in the display screen as an example, the load simulation circuit 01 connected to the output power terminal V_OUT can be used to simulate the load connected to the AVDDP in the display screen. In this way, the working state of simulating PCBA load can be realized.

[0058] The data acquisition system 02 is connected to multiple load simulation lines 01 and the data processing device 03 respectively, and is used to collect the voltage on each load simulation line 01 when the PCBA outputs power signals through multiple output power terminals V_OUT, and transmit the voltage on each load simulation line 01 to the data processing device 03. That is, for each output power terminal V_OUT on the PCBA, the data acquisition system 02 can simulate the voltage of the power signal output to the connected load through the output power terminal V_OUT by collecting the voltage on the corresponding load simulation line 01. In other words, the voltage on each load simulation line 01 can be used to reflect the voltage of the power signal output by the corresponding output power terminal V_OUT to the load.

[0059] The data processing device 03 is used to test the PCBA based on the voltage on each load simulation circuit 01. That is, for each output power terminal V_OUT on the PCBA, after receiving the voltage on the corresponding load simulation circuit 01, the data processing device 03 can test the power signal output by the output power terminal V_OUT based on the voltage to detect whether the power signal output by the PCBA through the output power terminal V_OUT is normal. If it is not normal (i.e., abnormal), it can reflect that the components on the PCBA may have failure problems. In this way, the OP rel of the PCBA is completed.

[0060] Optionally, a normal threshold may be set in the data processing device 03. If the voltage on the load simulation line 01 is greater than the normal threshold, it may indicate an abnormality; otherwise, it may indicate normality. The normal threshold may be pre-set through multiple verifications before OP rel.

[0061] In summary, the embodiment of the present application provides a test device for PCBA. Since a load simulation circuit for simulating the load connected to the output power supply terminal of the PCBA is provided in the test device, the data processing device can perform a reliable reliability test on the PCBA based on the voltage of the load simulation circuit collected by the data acquisition system before the PCBA is assembled into the electronic product, that is, the PCBA can be tested in advance. In this way, it is convenient to find out whether the electronic components in the PCBA have failed as early as possible, so as to avoid affecting the output process.

[0062] Optionally, combined Figure 1 It can be seen that the load may be a power line in the display. Accordingly, the plurality of output power terminals V_OUT may be output power terminals V_OUT connected to the power line in the display, such as the pull-up power lines AVDDP, AVDDN and / or the pull-down power line VGL2.

[0063] That is, the PCBA described in the embodiment of the present application can be applied to the display industry as a PCBA in a display screen to drive the display screen to display images. Of course, it is not limited to the display industry and can be flexibly applied to the OP rel of PCBA in the entire industry by changing the simulated load.

[0064] Optionally, in Figure 1 Based on this, continue to refer to Figure 2It can be seen from the structural schematic diagram of another test device that each load simulation circuit 01 may include: a first induction resistor Rsense1 and a load resistor Rload connected in series between the corresponding output power supply terminal V_OUT and the ground terminal GND. That is, the signal circuit of the simulated load added to the PCBA in the embodiment of the present application is the induction resistor Rsense1 and the load resistor Rload connected in series between the output power supply terminal V_OUT and the ground.

[0065] For example, a PCBA includes 6 output power terminals V_OUT, and the loads connected to the 6 output power terminals V_OUT are AVDDP, AVDDN, ..., VGL2 in sequence. Figure 2 The schematic diagram shows six load simulation circuits 01 connected to the six output power supply terminals V_OUT in a one-to-one correspondence. For distinction, the six output power supply terminals V_OUT are identified as 1-AVDDP, 2-AVDDN, ... 6-VGL2 from left to right. The six load simulation circuits 01 are identified as 01-1, 01-2, ... 1-6. In addition, the first sense resistor Rsense1 and the load resistor Rload included in the first load simulation circuit 01-1 are identified as Rsense1-1 and Rload-1, respectively, the first sense resistor Rsense1 and the load resistor Rload included in the second load simulation circuit 01-2 are identified as Rsense1-2 and Rload-2, respectively, ..., the first sense resistor Rsense1 and the load resistor Rload included in the sixth load simulation circuit 01-6 are identified as Rsense1-6 and Rload-6, respectively. In addition, for each load simulation circuit 01:

[0066] The data acquisition system 02 can be connected to both ends of the first sensing resistor Rsense1 and both ends of the load resistor Rload respectively, and can be used to collect the voltage across the first sensing resistor Rsense1 and the voltage between the corresponding output power supply terminal V_OUT and the ground terminal GND.

[0067] Similarly, to distinguish, Figure 2 The collected voltage across the first sensing resistor Rsense1 is identified as V1, and the collected voltage between the output power supply terminal V_OUT and the ground terminal GND is identified as V2. In addition, V1 and V2 on the first load simulation line 01-1 are identified as V1-1 and V2-1, respectively; V1 and V2 on the second load simulation line 01-2 are identified as V1-2 and V2-2, respectively, and V1 and V2 on the sixth load simulation line 01-6 are identified as V1-6 and V2-6, respectively.

[0068] On this basis, the data processing device 03 can be used to determine the current on the load simulation circuit 01 based on the voltage V1 across the first sensing resistor Rsense1, determine the voltage on the load simulation circuit 01 based on the voltage V2 between the output power supply terminal V_OUT and the ground terminal GND, and test the PCBA based on the current and voltage on the load simulation circuit 01.

[0069] It is understandable that, as described above, the test of the PCBA based on the current and voltage on the load simulation circuit 01 can be used to detect whether the power signal output by the PCBA through the output power terminal V_OUT is normal, so as to determine whether the components on the PCBA have failed based on the detection results.

[0070] Optionally, Rsense1 can be a small resistance. The data acquisition system 02 can collect the voltage V1 across Rsense1 and transmit it to the data processing device 03. The data processing device 03 can use V1 divided by the resistance of Rsense1 to obtain the current on the load simulation line 01. That is, for each load simulation line 01, V1 collected by the data acquisition system 02 can be used to monitor the current on this line. For example, the resistance value of Rsense1 can be between 0.1 ohms (Ω) and 0.5Ω. For example, it can be 0.25Ω. Of course, the resistance values ​​here are only schematic illustrations.

[0071] Optionally, Rload may be a simulated load. In the embodiment of the present application, a breakdown test may be used to determine the resistance value of Rload required to be added to each load simulation line 01 .

[0072] For example, first, the current of the output power supply terminal V_OUT corresponding to each load simulation circuit 01 when it is normally loaded (i.e., connected to the load) can be obtained through decomposition testing, and the current of the output power supply terminal V_OUT corresponding to each load simulation circuit 01 when it is not loaded (i.e., not connected to the load) can be obtained; then, the current difference between the normal loaded current and the unloaded current can be calculated; finally, the voltage on each load simulation circuit 01 is divided by the current difference on each load simulation circuit 01 to calculate the Rload required to be added to each load simulation circuit 01.

[0073] That is, for each load simulation circuit 01: the resistance value of the load resistor Rload can be determined based on the voltage on the load simulation circuit 01 divided by the current difference. The current difference can be the difference between the current on the load simulation circuit 01 when the output power supply terminal V_OUT corresponding to the load simulation circuit 01 is connected to the load and when it is not connected to the load.

[0074] Optionally, in Figure 2 Based on this, continue to refer to Figure 3 It can be seen from the structural schematic diagram of another test device that the test device may further include: a power supply (power supply) 04.

[0075] The power supply 04 can be connected to the PCBA, and can be used to provide a power signal (also called a main power signal) and an enable signal (Enable) to the PCBA, so that the PCBA responds to the enable signal and the power signal and outputs the power signal through a plurality of output power terminals V_OUT. That is, the power supply 04 can provide the main power signal and the enable signal required for the PCBA to work, so as to drive the PCBA to work.

[0076] Example, combined Figure 3 It can be seen that the power supply 04 can provide an enable signal and a power signal to the PCBA through different channels CH1 and CH2 respectively. In addition, the voltage of the provided enable signal can be between 1V and 3V, and the voltage of the provided power signal can be between 2.4V and 4.8V. For example, the voltage of the power signal can be Figure 3 3.8V as shown; the voltage of the enable signal can be Figure 3 The voltage shown is 1.8 V. Of course, the voltage values ​​here are only for illustration.

[0077] On this basis, continue to refer to Figure 3 It can also be seen that the PCBA may also have an input power terminal V_IN for receiving a power signal.

[0078] and, in Figure 3 On this basis, continue to refer to Figure 4 It can be seen that the data acquisition system 02 can also be connected to the input power terminal V_IN, and can be used to collect the voltage on the input power terminal V_IN, and can transmit the voltage on the input power terminal V_IN to the data processing device 03.

[0079] Taking the voltage of the power signal as 3.8V as an example, to distinguish it from the above terminals and voltages, Figure 3 In the example, the input power terminal V_IN is identified as 0-PP3V8_IN. That is, 0-PP3V8_IN can be the main power signal of the PCBA. In addition, the collected voltage on the input power terminal V_IN is identified as V3.

[0080] The data processing device 03 may also be used to test the PCBA based on the voltage V3 on the input power terminal V_IN.

[0081] It is understandable that the test of the PCBA based on the voltage V3 on the input power terminal V_IN can be used to detect whether the PCBA can normally receive the power signal provided by the power supply 04, so as to determine whether the components on the PCBA have failed based on the detection results.

[0082] Understandably, reference Figure 4 It can also be seen that the data acquisition system 02 can be connected to the input power terminal V_IN and the ground terminal GND at the same time. The ground terminal GND can be a ground that forms a loop with the input power terminal V_IN, so that the data acquisition system 02 can reliably collect the voltage V3 on the input power terminal V_IN.

[0083] Optionally, in Figure 4 Based on the reference Figure 5 It can be seen from the structural schematic diagram of another test device that the test device may further include: an input sensing circuit 05 .

[0084] The input sensing circuit 05 can be connected between the power supply 04 and the PCBA.

[0085] The data acquisition system 02 can also be connected to the input sensing line 05, and can be used to collect the voltage on the input sensing line 05, and can transmit the voltage on the input sensing line 05 to the data processing device 03. To distinguish from the above voltage, Figure 5 The collected voltage on the input sensing line 05 is identified as V4.

[0086] The data processing device 03 may also be used to test the PCBA based on the voltage V4 on the input sensing line 05 .

[0087] It is understandable that the test of the PCBA based on the voltage V4 on the input sensing line 05 can be used to detect whether the PCBA can normally receive the power signal provided by the power supply 04, so as to determine whether the components on the PCBA fail based on the detection results.

[0088] Optionally, in Figure 5 Based on this, continue to refer to Figure 6 It can be seen from the structural schematic diagram of another test device that the input sensing circuit 05 may include: a second sensing resistor Rsense2 connected in series between the power supply 04 and the PCBA.

[0089] The data acquisition system 02 may be connected to both ends of the second sensing resistor Rsense2 and may be used to acquire a voltage V4 across both ends of the second sensing resistor Rsense2.

[0090] The data processing device 03 may be used to determine the current on the input sensing line 05 based on the voltage V4 across the second sensing resistor Rsense2 , and to test the PCBA based on the current on the input sensing line 05 .

[0091] Optionally, like the first sensing resistor Rsense1, Rsense2 may also be a small resistance resistor, such as the resistance of Rsense2 may also be between 0.1Ω and 0.5Ω. The data acquisition system 02 may acquire the voltage V4 across Rsense2 and transmit it to the data processing device 03. The data processing device 03 may obtain the current on the input sensing line 05 by dividing V4 by the resistance of Rsense2. That is, V4 acquired by the data acquisition system 02 may be used to monitor the current on the input sensing line 05.

[0092] Optionally, in the embodiment of the present application, the data acquisition system 02 can be used to periodically collect voltage. That is, the data acquisition system 02 can periodically sample voltage data according to a set period, so that the data processing device 03 can directly perform periodic tests on the PCBA based on the voltage data, or calculate current data based on the voltage data, and perform periodic tests on the PCBA based on the current data.

[0093] Of course, in some other embodiments, the data acquisition system 02 may also sample voltage data in real time, so that the data processing device 03 can perform real-time monitoring and testing on the PCBA.

[0094] Optionally, in the embodiment of the present application, the data processing device 03 may also be configured to issue an alarm if it detects that the voltage collected by the data collection system 02 is abnormal.

[0095] Optionally, as described above, the voltage anomaly here can be measured by a normal threshold. Moreover, in the scenario where the PCBA is tested for voltage data, the normal threshold can be a voltage threshold; if the data processing device 03 detects that the voltage collected by the data acquisition system 02 is greater than the voltage threshold, it can be determined that an abnormality has occurred and an alarm can be issued in time. In the scenario where the PCBA is tested for current data, the normal threshold can be a current threshold; if the data processing device 03 detects that the current calculated based on the voltage collected by the data acquisition system 02 is greater than the current threshold, it can be determined that an abnormality has occurred and an alarm can be issued in time.

[0096] Optionally, the alarm prompt may include, for example, a sound alarm and / or a light alarm. A sound alarm is a sound alarm that emits a sound to alarm; accordingly, the data processing device 03 may include a sound alarm (e.g., a speaker). A light alarm is a light emitting element similar to a light emitting diode that emits a certain color of light (e.g., a striking red color) to alarm; accordingly, the data processing device 03 may include a light emitting element. Of course, it is not limited to the sound and light alarm mode. Of course, after the above-mentioned abnormality is resolved, the alarm may also be released.

[0097] Optionally, in some embodiments, the data processing device 03 may further include a display screen, and the data processing device 03 may display the determined voltage data and current data on the display screen for a user (eg, a tester) to view and analyze whether the PCBA has component failure problems.

[0098] Optionally, in Figure 6 On the basis of Figure 7 The schematic diagram of the structure of another testing device is shown schematically. Figure 7 It can be seen that the data acquisition system 02 may include: a data acquisition card (multiplexer) 031 and a data gatherer (data gather) 032 which are sequentially connected between the multiple load simulation lines 01 and the data processing device 03. That is, the data acquisition system 02 may be a module including a data acquisition card 021 and a data gatherer 022. The data acquisition card 021 may be used to collect voltage and transmit it to the data processing device 03 through the data gatherer 022.

[0099] Optionally, continue to refer to Figure 7 It can be seen that the data processing device 03 may include: a personal computer (PC).

[0100] Optionally, refer to Figures 1 to 7 It can also be seen that the test device can also include: a test fixture. The PCBA and multiple load simulation lines 01 can be located in the test fixture. That is, a test fixture can be provided to connect the PCBA and multiple load simulation lines 01. In other words, the sense resistor Rsense1 and the load resistor Rload are circuits set in the test fixture for the data acquisition system 02 to collect voltage.

[0101] When testing, a matching test fixture can be designed for the PCBA according to the structure of the PCBA, and a probe can be set at the test point position corresponding to the test fixture to connect the test point with the inductive resistors Rsense1, Rsense2, the load resistor Rload and the input power supply terminal V_IN. After the connection is completed, the test fixture can be placed in a test furnace (Chamber) and the reliability test conditions can be set. After that, the power supply 04 can be started again. At this time, the data acquisition card 021 and the data acquisition device 022 can cooperate with each other to sample the voltage and transmit it to the computer PC for summary processing to complete the reliability test of the PCBA. Optionally, the reliability test conditions can be, for example, high temperature and high humidity environmental conditions. Correspondingly, the test furnace Chamber can also be called an environmental furnace Chamber.

[0102] Optionally, a test chamber can generally perform reliability tests on multiple PCBAs at the same time. Accordingly, taking the reliability test of 8 PCBAs at the same time as an example, continue to refer to Figure 7 It can be seen that 8 test fixtures, Fixture-1 to Fixture-8, can be provided to place 8 PCBA-1 to PCBA-8 in the same test chamber through the 8 test fixtures to implement the reliability test of the 8 PCBAs. In this way, the test efficiency is relatively high. Figures 1 to 6 The PCBA shown may be PCBA-1, and the test fixture may be Fixture-1. And, Figure 8 The output voltages of the ports collected for PCBA-2 are marked as V15 to V28; the output voltages of the ports collected for PCBA-8 are marked as V99 to V112.

[0103] Optionally, combined Figure 7 It can also be seen that for the reliability test of multiple PCBAs placed in a test chamber, the same data acquisition system 02, data processing equipment 03 and power supply 04 can be shared. In this way, the cost can be simplified.

[0104] Optionally, continue to refer to Figure 7 It can also be seen that the data acquisition system 02 and the data processing device 03 can be connected via a universal serial bus (USB). Of course, the connection method here is only a schematic description.

[0105] Based on the foregoing records, it can be seen that, through the test device provided in the embodiment of the present application, when testing different PCBAs, it is only necessary to adaptively modify the test fixture Fixture and the load resistor Rload, and the application range is relatively wide.

[0106] In summary, the embodiment of the present application provides a test device for PCBA. Since a load simulation circuit for simulating the load connected to the output power supply terminal of the PCBA is provided in the test device, the data processing device can perform a reliable reliability test on the PCBA based on the voltage of the load simulation circuit collected by the data acquisition system before the PCBA is assembled into the electronic product, that is, the PCBA can be tested in advance. In this way, it is convenient to find out whether the electronic components in the PCBA have failed as early as possible, so as to avoid affecting the output process.

[0107] The present application also provides a PCBA testing method. The method is applied to Figures 1 to 7 Any of the test devices shown includes a data processing device 03. Figure 8 As shown, the method includes:

[0108] Step 801: Obtain the voltage on each load simulation line.

[0109] The voltage on each load simulation line is collected by the data acquisition system when the PCBA outputs power signals through multiple output power terminals.

[0110] Step 802: Test the PCBA based on the voltage on each load simulation line.

[0111] It is understandable that since the PCBA testing method has substantially the same implementation manner and technical effects as the testing device described in the previous embodiment, for the purpose of brevity, the implementation manner and technical effects of the testing method will not be repeatedly described herein.

[0112] The present application also provides a PCBA testing system. Fig. 9 As shown, the test system includes: a test furnace Chamber, and Figures 1 to 7 Any of the test setups shown.

[0113] Combination Figures 1 to 7 It can be seen that the multiple load simulation circuits 01 and PCBA in the test device can be placed in the test furnace chamber, so as to allow the data acquisition system 02 and data processing equipment 03 in the test device to test the PCBA. Of course, as mentioned above, the input sensing circuit 05 in the test device can also be placed in the test furnace chamber.

[0114] Optionally, combined Figure 7 and Fig. 9 It can also be seen that a test chamber can generally perform reliability tests on multiple PCBAs at the same time. In addition, each PCBA and the corresponding load simulation circuit 01 can be placed in a test fixture. Figure 7 Take the 8 test fixtures shown as an example. Fig. 9 It also only schematically shows eight test fixtures placed in a test furnace chamber.

[0115] Optionally, Fig. 9 The power supply, as well as the data acquisition card and data acquisition device included in the data acquisition system are also schematically shown. Fig. 9 It can be seen that the power supply can supply power to the test fixture placed in a test furnace chamber. The data acquisition card and the data acquisition device can cooperate with each other to collect voltage data related to the PCBA in the test fixture, and transmit the collected voltage data to a data processing device such as a computer (such as a PC) for the data processing device to test the PCBA.

[0116] It is understandable that since the PCBA test system has substantially the same implementation manner and technical effects as the test device described in the previous embodiment, for the purpose of brevity, the implementation manner and technical effects of the test system will not be repeatedly described herein.

[0117] It should be noted that the terms used in the examples of this application are only used to explain the examples and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should be the common meanings understood by people with ordinary skills in the field to which this application belongs.

[0118] For example, the words "first", "second" or "third" and similar words used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0119] Likewise, the words “a” or “an” and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

[0120] “Including” or “comprising” and similar words mean that the elements or objects appearing before “including” or “comprising” include the elements or objects listed after “including” or “comprising” and their equivalents, and do not exclude other elements or objects.

[0121] “Up”, “down”, “left” or “right” etc. are only used to indicate relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0122] "Connected" or "coupled" means electrically connected.

[0123] "And / or" indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship.

[0124] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A test device for a printed circuit board assembly (PCBA), characterized in that: The PCBA has multiple output power terminals, and the multiple output power terminals are used to connect multiple loads; the test device includes: multiple load simulation circuits, a data acquisition system and a data processing device; The plurality of load simulation circuits are connected to the plurality of output power supply terminals in a one-to-one correspondence, and each of the load simulation circuits is used to simulate a load connected to the corresponding output power supply terminal; The data acquisition system is connected to the multiple load simulation lines and the data processing device respectively, and is used to collect the voltage on each of the load simulation lines when the PCBA outputs the power signal through the multiple output power terminals, and transmit the voltage on each of the load simulation lines to the data processing device; The data processing device is used to test the PCBA based on the voltage on each load simulation line.

2. The testing device according to claim 1, characterized in that: Each load simulation circuit includes: a first inductive resistor and a load resistor connected in series between the corresponding output power supply terminal and the ground terminal; for each load simulation circuit: The data acquisition system is connected to both ends of the first sensing resistor and both ends of the load resistor respectively, and is used to collect the voltage across the first sensing resistor and the corresponding voltage between the output power supply terminal and the ground terminal; The data processing device is used to determine the current on the load simulation circuit based on the voltage across the first sensing resistor, determine the voltage on the load simulation circuit based on the voltage between the output power terminal and the ground terminal, and test the PCBA based on the current and voltage on the load simulation circuit.

3. The testing device according to claim 2, characterized in that: For each of the load simulation lines: the resistance of the load resistor is determined based on the voltage on the load simulation line divided by the current difference; The current difference is the difference between the current on the load simulation circuit when the corresponding output power supply terminal is connected to the load and when the corresponding output power supply terminal is not connected to the load.

4. The testing device according to any one of claims 1 to 3, characterized in that: The testing device also includes: a power supply; The power supply is connected to the PCBA and is used to provide a power signal and an enable signal to the PCBA, so that the PCBA outputs the power signal through the multiple output power terminals in response to the enable signal and the power signal.

5. The testing device according to claim 4, characterized in that: The PCBA also has an input power terminal for receiving the power signal; The data acquisition system is also connected to the input power supply terminal and is used to collect the voltage on the input power supply terminal and transmit the voltage on the input power supply terminal to the data processing device; The data processing device is further used to test the PCBA based on the voltage on the input power terminal.

6. The testing device according to claim 4, characterized in that: The test device further includes: an input sensing circuit; The input sensing circuit is connected between the power supply and the PCBA; The data acquisition system is also connected to the input sensing line and is used to acquire the voltage on the input sensing line and transmit the voltage on the input sensing line to the data processing device; The data processing device is further configured to test the PCBA based on the voltage on the input sensing line.

7. The testing device according to claim 6, characterized in that: The input sensing circuit includes: a second sensing resistor connected in series between the power supply and the PCBA; The data acquisition system is connected to both ends of the second sensing resistor and is used to collect the voltage across the two ends of the second sensing resistor; The data processing device is used to determine the current on the input sensing line based on the voltage across the second sensing resistor, and to test the PCBA based on the current on the input sensing line.

8. The testing device according to any one of claims 1 to 3, characterized in that: The data acquisition system is used to periodically collect voltage.

9. The testing device according to any one of claims 1 to 3, characterized in that: The data acquisition system comprises: a data acquisition card and a data collector which are sequentially connected between the plurality of load simulation lines and the data processing equipment.

10. The testing device according to any one of claims 1 to 3, characterized in that: The data processing device is also used to issue an alarm if it detects that the voltage collected by the data collection system is abnormal.

11. The testing device according to any one of claims 1 to 3, characterized in that: The data processing equipment includes: a computer.

12. The testing device according to any one of claims 1 to 3, characterized in that: The load is a power supply circuit in the display.

13. The testing device according to any one of claims 1 to 3, characterized in that: The testing device further includes: a testing fixture; the PCBA and the plurality of load simulation circuits are located in the testing fixture.

14. A PCBA testing method, characterized in that: Applied to a data processing device included in a test device as claimed in any one of claims 1 to 13; the method comprises: Acquire the voltage on each load simulation line, where the voltage on each load simulation line is acquired by the data acquisition system when the PCBA outputs power signals through multiple output power terminals; The PCBA is tested based on the voltage on each of the load simulation lines.

15. A PCBA testing system, characterized in that: The test system comprises: a test furnace, and a test device as claimed in any one of claims 1 to 13; The multiple load simulation circuits in the test device and the PCBA are placed in the test furnace, so as to allow the data acquisition system and data processing equipment in the test device to test the PCBA.

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