Silver paste activation detection system

Abstract

The utility model provides a silver paste activation detection system, which is used for detecting the activation state of conductive silver paste of a to-be-tested module, and comprises a power supply module for outputting constant current and a test fixture electrically connected with the power supply module, and the test fixture is used for loading the to-be-tested module. The power supply module and the conductive silver paste of the to-be-tested module are connected in series to form a closed loop; the system also comprises a resistor element connected in series with the closed loop and a test module connected in parallel with the resistor element. The test module is used for detecting a voltage value at two ends of the resistor element after the conductive silver paste is electrified for at least 2 seconds, and when the voltage value detected by the test module is greater than or equal to a preset voltage value, the test module judges that the conductive silver paste is activated; when the voltage value detected by the test module is smaller than the preset voltage value, the test module judges that the conductive silver paste is not activated. The silver paste activation detection system provided by the utility model can realize automatic detection of the activation state of the conductive silver paste, and saves a lot of time and labor cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of silver paste activation detection, and particularly relates to a silver paste activation detection system. Background Technique

[0002] With the improvement of the performance of the camera module of mobile devices, the power consumption and heat generation of the camera module also increase. To reduce the chip temperature of the camera module, heat dissipation can be achieved by plating copper on the chip surface and coating conductive silver paste.

[0003] The conductive silver paste needs to be activated by a current for a certain period of time to activate its conductive property. The traditional silver paste activation process is manually activated, and it is necessary to manually check the current value and the duration of the current passing through the silver paste. Such silver paste activation detection will consume a lot of time and labor costs.

[0004] Therefore, it is necessary to provide a silver paste activation detection system that can automatically detect the activation state of the conductive silver paste. Summary of the Invention

[0005] The purpose of the utility model is to provide a silver paste activation detection system that can automatically detect the activation state of the conductive silver paste.

[0006] The technical solution of the utility model is as follows:

[0007] A silver paste activation detection system is used to detect the activation state of the conductive silver paste of the module to be tested. The system includes a power supply module that outputs a constant current and a test fixture electrically connected to the power supply module. The test fixture is used to load the module to be tested so that the power supply module and the conductive silver paste of the module to be tested are connected in series to form a closed loop;

[0008] It is characterized in that the system further includes a resistance element connected in series in the closed loop and a test module connected in parallel to the resistance element;

[0009] The test module is used to detect the voltage value across the resistance element after the conductive silver paste is energized for at least 2 s. When the voltage value detected by the test module is greater than or equal to a preset voltage value, the test module determines that the conductive silver paste is activated; when the voltage value detected by the test module is less than the preset voltage value, the test module determines that the conductive silver paste is not activated.

[0010] Further, the test module includes an analog-to-digital conversion module connected in parallel to the resistance element and a control module connected to the analog-to-digital conversion module;

[0011] The analog-to-digital conversion module is used to convert the voltage value across the resistance element into a digital signal;

[0012] The control module is configured to obtain the digital signal after the conductive silver paste is energized for at least 2 s, and detect the voltage value across the resistor element according to the digital signal; when the voltage value is greater than or equal to the preset voltage value, the control module determines that the conductive silver paste is activated, and when the voltage value is less than the preset voltage value, the control module determines that the conductive silver paste is not activated.

[0013] Further, the output end of the power supply module is connected to the input end of the test fixture, the input end of the resistor element is used to connect to the output end of the module to be tested, and the output end of the resistor element is connected to the input end of the power supply module.

[0014] Further, the resistance value of the resistor element is R, the constant current output by the power supply module is I, and the preset voltage value is U, where U = I × R.

[0015] Further, the constant current output by the power supply module is 100 mA, and the preset voltage value is less than 1.5 V.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The test fixture for loading the module to be tested, the resistor element, and the power supply module form a closed loop. The test module is connected in parallel with the resistor element. The test module can detect the voltage value across the resistor element, and the conductive silver paste of the module to be tested is connected in series in the closed loop.

[0018] The conductive silver paste enters the activated state after passing a current for at least 2 s. The resistance value of the conductive silver paste in the activated state is much smaller than that in the non-activated state. When the current output by the power supply module passes through the conductive silver paste for at least 2 s, the resistance value of the conductive silver paste decreases, and the voltage value across the resistor element increases. When the test module detects that the voltage value is greater than or equal to the preset voltage value, the test module determines that the conductive silver paste is activated. In this way, the automatic detection of the activation state of the conductive silver paste is realized. The automatic detection improves the reliability of the detection of the activation state of the conductive silver paste, can batch detect the activation state of the conductive silver paste, and saves a large amount of time and labor costs. Description of the Drawings

[0019] Figure 1 is the structural block diagram of the silver paste activation test system of the present utility model;

[0020] Figure 2 is the structural schematic diagram of the silver paste activation test system of the present utility model;

[0021] Reference Signs:

[0022] 01, module to be tested; 011, PCB board; 012, copper foil; 013, conductive silver paste;

[0023] 1. Power module;

[0024] 2. Test fixture; 21. Connector;

[0025] 3. Resistance element;

[0026] 4. Test module; 41. Analog-to-digital conversion module; 42. Control module. Detailed implementation

[0027] Please refer to Figures 1 to 2 , a silver paste activation detection system for detecting the activation state of the conductive silver paste 013 of the module 01 to be tested. The system includes a power module 1 that outputs a constant current and a test fixture 2 electrically connected to the power module 1. The test fixture 2 is used to load the module 01 to be tested so that the power module 1 and the conductive silver paste 013 of the module 01 to be tested are connected in series to form a closed loop;

[0028] The system further includes a resistance element 3 connected in series in the closed loop and a test module 4 connected in parallel to the resistance element 3;

[0029] The test module 4 is used to detect the voltage value across the resistance element 3 after the conductive silver paste 013 is energized for at least 2 s. When the voltage value detected by the test module 4 is greater than or equal to the preset voltage value, the test module 4 determines that the conductive silver paste 013 is activated; when the voltage value detected by the test module 4 is less than the preset voltage value, the test module 4 determines that the conductive silver paste 013 is not activated.

[0030] The test fixture 2 for loading the module 01 to be tested, the resistance element 3, and the power module 1 form a closed loop. The test module 4 is connected in parallel to the resistance element 3. The test module 4 can detect the voltage value across the resistance element 3. The conductive silver paste 013 of the module 01 to be tested is connected in series in the closed loop.

[0031] The conductive silver paste 013 enters the activation state after passing through a current for at least 2 s. The resistance value of the conductive silver paste 013 in the activation state is much smaller than that of the conductive silver paste 013 in the non-activated state. When the current output by the power module 1 passes through the conductive silver paste 013 for at least 2 s, the resistance value of the conductive silver paste 013 decreases, and the voltage value across the resistance element 3 increases. When the test module 4 detects that the voltage value is greater than or equal to the preset voltage value, the test module 4 determines that the conductive silver paste 013 is activated. In this way, the automatic detection of the activation state of the conductive silver paste 013 is realized. The automatic detection improves the reliability of the detection of the activation state of the conductive silver paste 013, can batch-detect the activation state of the conductive silver paste 013, and saves a large amount of time and labor costs.

[0032] In this embodiment, as Figure 2As shown, the module 01 to be tested includes a PCB board 011 and a conductive copper foil 012 disposed on the surface of the PCB board 011. A conductive silver paste 013 connects the pad of the PCB board 011 and the conductive copper foil 012. The test fixture 2 can automatically load and unload the module 01 to be tested. The test fixture 2 includes a connector 21. The conductive silver paste 013 is electrically connected to the connector 21 through a lead on the PCB board 011, and the connector 21 is connected in series to a closed loop.

[0033] It should be noted that the resistance element 3 can be a single resistor, or the resistance element 3 can be composed of multiple resistors connected in series, or composed of multiple resistors connected in series and in parallel. In the related art, the conductive silver paste 013 needs to be activated by a constant current of 100 mA for more than 2 s to activate its conductive property. Therefore, the resistance value of the resistance element 3 can be set according to the current output by the power supply module 1.

[0034] Furthermore, as Figure 2 shown, the test module 4 includes an analog-to-digital conversion module 41 connected in parallel to the resistance element 3 and a control module 42 connected to the analog-to-digital conversion module 41 for information;

[0035] The analog-to-digital conversion module 41 is used to convert the voltage value across the resistance element 3 into a digital signal;

[0036] The control module 42 is used to obtain the digital signal after the conductive silver paste 013 is energized for at least 2 s, and detect the voltage value across the resistance element 3 according to the digital signal; when the voltage value is greater than or equal to the preset voltage value, the control module 42 determines that the conductive silver paste 013 is activated; when the voltage value is less than the preset voltage value, the control module 42 determines that the conductive silver paste 013 is not activated.

[0037] After the power supply module 1 starts to output a constant current in the closed loop, the power supply module 1 and the conductive silver paste 013 of the module 01 to be tested are connected in series to form a closed loop. The analog-to-digital conversion module 41 detects that there is a voltage value across the resistance element 3 and converts it into a digital signal. At this time, the control module 42 can obtain this digital signal. Define the moment when the power supply module 1 starts to output a constant current in the closed loop as the initial time.

[0038] The control module 42 is used to obtain a digital signal at the initial time, and the control module 42 is also used to obtain a digital signal again after an interval of 2 s from the initial time, and detect the voltage value across the resistance element 3 according to the digital signal obtained after an interval of 2 s from the initial time.

[0039] In this embodiment, the control module 42 is disposed in the computer device, and the analog-to-digital conversion module 41 is connected to the computer device through a data line. The analog-to-digital conversion module 41 and the control module 42 can automatically detect the voltage value across the resistor element 3, and can judge the activation state of the conductive silver paste 013 according to the voltage value, realizing the automation of the activation detection of the conductive silver paste 013, and saving time and labor costs.

[0040] Further, the output end of the power supply module 1 is used to connect to the input end of the test fixture 2, the input end of the resistor element 3 is used to connect to the output end of the module 01 to be tested, and the output end of the resistor element 3 is connected to the input end of the power supply module 1.

[0041] In this embodiment, as Figure 2 shown, the current output by the current module sequentially passes through the test fixture 2 and the resistor element 3. The current output by the current module first passes through the test fixture 2 to activate the conductive silver paste 013 of the module 01 to be tested loaded in the test fixture 2.

[0042] Further, the resistance value of the resistor element 3 is R, the constant current output by the power supply module 1 is I, and the preset voltage value is U, where U = I×R.

[0043] Further, the constant current output by the power supply module 1 is 100 mA, and the preset voltage value is less than 1.5 V.

[0044] After the conductive silver paste 013 is activated, the conductive silver paste 013 has a conductive property, and the voltage across the module 01 to be tested approaches 0. The power supply module 1 is a constant current source with a constant current output of 100 mA. The constant current output by the power supply module 1 returns to the power supply module 1 through the conductive silver paste 013 and the resistor element 3. The resistance value of the resistor element 3 is 5 Ω. According to U = IR, the voltage value across the resistor element 3 at this time is calculated to be approximately 500 mV. The preset voltage value is set to 500 mV. When the test module 4 detects that the voltage value across the resistor element 3 is greater than or equal to the preset voltage value of 500 mV, it is determined that the conductive silver paste 013 is activated.

[0045] It can be understood that the resistance value of the resistor element 3 is variable, and the resistance value of the resistor element 3 can be changed, but the constant current output by the power supply module 1 remains 100 mA, and the preset voltage value only needs to be less than 1.5 V.

[0046] Compared with the related art, in the above structure, by connecting a resistance element 3 in series in the closed circuit formed by the test fixture 2 for loading the module 01 to be tested and the power module 1, and adding a test module 4 connected in parallel to the resistance element 3, the test module 4 can detect the voltage value across the resistance element 3 and determine the activation state of the conductive silver paste 013 according to the voltage value, thus ingeniously realizing the automatic detection of the activation state of the conductive silver paste 013, without the need for manual judgment on whether the conductive silver paste 013 meets the activation conditions, greatly saving time and labor costs.

[0047] The above are only the embodiments of the present invention. It should be noted here that for those of ordinary skill in the art, without departing from the creative concept of the present invention, improvements can still be made, but these all fall within the protection scope of the present invention.

Claims

1. A silver paste activation detection system for detecting the activation state of a conductive silver paste of a module to be tested, the system comprising a power module outputting a constant current and a test fixture electrically connected to the power module, the test fixture being used to load the module to be tested so that the power module and the conductive silver paste of the module to be tested are connected in series to form a closed loop; It is characterized in that The system further comprises a resistance element connected in series to the closed loop and a test module connected in parallel to the resistance element; The test module is used to detect the voltage value across the resistance element after the conductive silver paste is energized for at least 2 seconds. When the voltage value detected by the test module is greater than or equal to a preset voltage value, the test module determines that the conductive silver paste is activated; when the voltage value detected by the test module is less than the preset voltage value, the test module determines that the conductive silver paste is not activated.

2. The system according to claim 1, characterized in that The test module includes an analog-to-digital conversion module connected in parallel to the resistance element and a control module connected to the analog-to-digital conversion module; The analog-to-digital conversion module is used to convert the voltage value at both ends of the resistance element into a digital signal; The control module is used to obtain the digital signal after the conductive silver paste is energized for at least 2 seconds, and detect the voltage value at both ends of the resistance element according to the digital signal; When the voltage value is greater than or equal to the preset voltage value, the control module determines that the conductive silver paste is activated; when the voltage value is less than the preset voltage value, the control module determines that the conductive silver paste is not activated.

3. The system according to claim 1, characterized in that The output end of the power module is connected to the input end of the test fixture, the input end of the resistor element is used to connect to the output end of the module to be tested, and the output end of the resistor element is connected to the input end of the power module.

4. The system according to claim 1, characterized in that The resistance value of the resistor element is R, the constant current output by the power module is I, and the preset voltage value is U, where U=I×R.

5. The system according to claim 4, characterized in that The constant current output by the power module is 100mA, and the preset voltage value is less than 1.5V.

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