PCBA connector pin-to-pin impedance automatic detection device

Abstract

The utility model relates to PCBA board detection technical field discloses a kind of PCBA connector pin impedance automatic detection device of automatic measurement connector pin impedance to improve the efficiency of measurement, including measurement board, measurement circuit is equipped on measurement board, measurement circuit includes main controller, gear selection circuit, pin selection circuit, relay drive circuit, gear selection circuit includes the multiple gear channels of parallelly arranged, each gear channel includes one gear resistance and one first relay switch in series, each gear resistance resistance is different;Pin selection circuit includes the several pin channels of parallelly arranged, each pin channel includes one pin port for being electrically connected with the connector pin to be measured, the second relay switch in series on pin port and gear selection circuit connection line, third relay switch is arranged between pin port and second relay switch and ground, and relay drive circuit is electrically connected with each first, second and third relay switch.

Description

Technical Field

[0001] This utility model relates to the field of PCBA board testing technology, and in particular to an automatic impedance detection device between PCBA connector pins. Background Technology

[0002] A PCBA (Printed Circuit Board Assembly) is a bare PCB board with all electronic components (such as chips, resistors, capacitors, etc.) installed and soldered. It is a complete circuit unit with a specific function that can be immediately put into testing or use. When a PCBA malfunctions, the impedance between the PCBA connector pins will deviate from the normal value. Currently, the industry mainly detects PCBA faults by manually measuring the impedance between the connector pins. However, as consumer electronics products become more and more functional and smaller, the number of pins on the PCBA connectors is increasing, and the spacing between the pins is getting smaller. This makes it increasingly difficult to manually measure the impedance between PCBA connector pins, resulting in insufficient measurement efficiency. Utility Model Content

[0003] Therefore, it is necessary to provide an automatic impedance detection device between PCBA connector pins that can improve measurement efficiency, addressing the aforementioned shortcomings.

[0004] An automatic impedance detection device for PCBA connector pins includes a measuring board with a measuring circuit. The measuring circuit includes a main controller, a range selection circuit electrically connected to the main controller, a pin selection circuit electrically connected to both the range selection circuit and the main controller, and a relay drive circuit electrically connected to the main controller. The range selection circuit includes multiple range channels connected in parallel. Each range channel includes a range resistor and a first relay switch connected in series with the range resistor. The resistance values ​​of the range resistors are different. The pin selection circuit includes several pin channels connected in parallel. Each pin channel includes a pin port for electrical connection to the pin of the connector under test, a second relay switch connected in series between the pin port and the range selection circuit, and a third relay switch disposed between the pin port and the second relay switch and grounded. The relay drive circuit is electrically connected to each of the first, second, and third relay switches.

[0005] In one embodiment, the gear selection circuit further includes a digital-to-analog converter electrically connected to the main controller, an operational amplifier electrically connected to the digital-to-analog converter, and an analog-to-digital converter electrically connected to the main controller and grounded to each pin port. The digital-to-analog converter is electrically connected to the gear position resistor on each gear position channel.

[0006] In one embodiment, the gear selection circuit includes three gear channels, and the resistance values ​​of the three gear resistors are 100Ω, 1kΩ, and 10kΩ, respectively.

[0007] In one embodiment, the pin selection circuit includes 50 pin channels arranged in parallel.

[0008] In one embodiment, the PCBA connector pin-to-pin impedance automatic detection device further includes an adapter board for electrical connection with the connector under test, the adapter board being electrically connected to the measuring board.

[0009] In one embodiment, the input end of the adapter board is provided with an input port that is electrically connected to each pin port. The output end of the adapter board is provided with N output ports connected in parallel for each input port. The N output ports are electrically connected to their corresponding input ports, where N is an integer greater than or equal to 2.

[0010] In one embodiment, the output port of the adapter board is electrically connected to the pins of the connector under test via a flexible flat cable.

[0011] The PCBA connector pin-to-pin impedance automatic detection device of this invention includes a main controller, a range selection circuit, a pin selection circuit, and a relay drive circuit. The relay drive circuit controls the opening and closing of corresponding relay switches on the range selection circuit and the pin selection circuit, enabling the selection of the measurement range during impedance measurement and measuring the impedance between preset pins. It eliminates the need for manual measurement of each pin of the connector, achieving automatic measurement of the impedance between connector pins. This effectively solves the problem of inconvenience caused by the increase in the number of connector pins and the reduction in pin spacing, and helps to improve the measurement efficiency of PCBA connector pin-to-pin impedance. Attached Figure Description

[0012] Figure 1 This is a circuit module connection diagram of the measuring board in one embodiment of the present invention; Figure 2 This is a simplified circuit diagram of the measuring board in one embodiment of the present invention; Figure 3 This is a schematic diagram of the measurement principle of the measuring plate in one embodiment of the present invention; Figure 4 This is a structural block diagram of an automatic impedance detection device between PCBA connector pins in one embodiment of the present invention. Detailed Implementation

[0013] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] This utility model discloses an automatic impedance detection device for PCBA connector pins that improves measurement efficiency. The device includes a measurement board 100 with a measurement circuit for automatically acquiring and measuring the impedance between PCBA connector pins. For details, please refer to [link to relevant documentation]. Figure 1 The measurement circuit includes a main controller 110, a range selection circuit 120 electrically connected to the main controller 110, a pin selection circuit 130 electrically connected to the range selection circuit 120 and the main controller 110, and a relay drive circuit 140 electrically connected to the main controller 110. The main controller 110 is a PLC controller or a microcontroller. Preferably, in this embodiment, the main controller 110 is an MCU. The range selection circuit 120 includes multiple range channels connected in parallel. Each range channel includes a range resistor 121 and a first relay switch 122 connected in series with the range resistor 121. The resistance values ​​of each range resistor 121 are different. Thus, during measurement, by selecting the corresponding measurement range, i.e., selecting the range channel with the preset resistance value, the resistance between the pins to be measured is adapted to the measurement range. This avoids the problem of insufficient resolution and huge errors when measuring extremely high resistance due to negligible voltage changes; and avoids the problem of voltage changes being too small to distinguish from noise and the resistance to be measured when measuring extremely low resistance, thereby improving measurement accuracy and resolution. The pin selection circuit 130 includes several pin channels arranged in parallel. Each pin channel includes a pin port 131 for electrical connection with the pin of the connector under test, a second relay switch 132 connected in series in the connection line between the pin port 131 and the range selection circuit 120, and a third relay switch 133 disposed between the pin port 131 and the second relay switch 132 and grounded. The relay drive circuit 140 is electrically connected to each of the first relay switch 122, the second relay switch 132 and the third relay switch 133.

[0015] Before measurement, all pins on the connector under test can be electrically connected to pin ports 131 on the measurement board 100. Then, the main controller 110 sends corresponding drive signals to the relay drive circuit 140, causing the relay drive circuit 140 to control the preset first relay switch 122, second relay switch 132, and third relay switch 133 to conduct, thereby achieving the measurement of the impedance between preset pins on the connector. It should be noted that in this embodiment, the relay drive circuit 140 includes three independently controlled sub-circuits, i.e., three sub-circuits connected in parallel. The first sub-circuit controls the opening and closing of each first relay switch 122, allowing one of the multiple first relay switches 122 in the range selection circuit 120 to conduct. The second sub-circuit controls the opening and closing of each second relay switch 132, and the third sub-circuit controls the opening and closing of each third relay switch 133. In this scheme, when each pin port 131 is connected to a pin on the connector, the second sub-circuit controls one of the second relay switches 132 to be turned on, and the third sub-circuit controls one of the third relay switches 133 to be turned on, so that the automatic detection device can measure the impedance between two pins on the connector in a single operation. When the relay drive circuit 140 is working, the three sub-circuits work simultaneously, that is, during the measurement process, one first relay switch 122, one second relay switch 132, and one third relay switch 133 are turned on simultaneously, while the remaining relay switches are turned off. In this embodiment, each of the three sub-circuits may include an integrated driver chip with a Darlington transistor array. The integrated driver chip receives signals sent by the corresponding GPIO pins of the main controller 110 and controls the operation of each relay switch according to a preset timing sequence. The relay drive circuit 140 also includes a power supply for the main controller 110 and each integrated driver chip. Of course, in other embodiments, each sub-circuit can also be a different circuit structure. The structure of the sub-circuit is based on the fact that the sub-circuit can control the corresponding first relay switch 122 to be turned on under the control of the main controller 110, and can control the corresponding second relay switch 132 and third relay switch 133 to be turned on according to a preset timing sequence. This will not be elaborated further here.

[0016] Please combine Figure 1-3 The gear selection circuit 120 also includes a connection to the main controller 110 (i.e., Figure 2 The MCU in the middle is electrically connected to the digital-to-analog converter 123 (i.e. Figure 2 The DAC, operational amplifier 124 electrically connected to digital-to-analog converter 123, and analog-to-digital converter 125 electrically connected to main controller 110 and grounded to all pin ports 131 are also included. Figure 2The analog-to-digital converter (ADC) 123 is electrically connected to the range resistors 121 on each range channel. Thus, the digital signal output by the main controller 110 is converted into an analog voltage by the ADC 123. This analog voltage serves as a reference voltage, and is further amplified by the operational amplifier 124 after signal conditioning, increasing the voltage to the required range to provide sufficient current to the corresponding range channel and the pin under test. In this embodiment, during pin impedance measurement, the two conducting pins can be equivalent to a resistor under test. The analog-to-digital converter 125 converts the voltage or current signal at the resistor under test in the pin selection circuit 130 from an analog signal to a digital signal and transmits it to the main controller 110 so that the main controller 110 can obtain the relevant parameters of the resistor under test.

[0017] In this solution, the range selection circuit 120 includes three range channels, with resistance values ​​of 100Ω, 1kΩ, and 10kΩ for the three range resistors 121. This means the connector can measure the inter-pin impedance at three ranges: 100Ω, 1kΩ, and 10kΩ. In this embodiment, by setting different range resistors 121, different inter-pin impedance values ​​of the connector can be accommodated. By matching the range resistor 121 with the resistance of the measured resistor (inter-pin impedance), the measurement signal is optimized to the optimal operating range of the analog-to-digital converter 125, thereby achieving high-precision measurement throughout the entire measurement range. Furthermore, by combining multiple range resistors 121 of different orders of magnitude, such as 100Ω, 1kΩ, and 10kΩ in this solution, the measurement range can be extended from a few ohms to tens of megaohms, which is impossible with a single fixed resistor, thus expanding the measurement range of inter-pin impedance. Furthermore, the pin selection circuit 130 of this embodiment includes 50 pin channels arranged in parallel, meaning that the automatic detection device of this embodiment supports the measurement of 50 pins (i.e., supports 50-pin measurement). Of course, in other embodiments, the number of pin channels can be increased by adjusting the measurement circuit according to the number of pins of the connector under test, so as to meet the measurement requirements of connectors with more pins.

[0018] The following combination Figure 1-3 This explains the measurement principle of the measuring plate 100 in this scheme.

[0019] The measuring board 100 is used to automatically measure the impedance between any two pins on the connector. Specifically, in this embodiment, the relay drive circuit 140 controls the first relay switch 122 (i.e., the one connected in series with the 1kΩ range resistor 121) in series. Figure 3 When SW_R2 is closed, the 1kΩ measurement range is selected, and the control is applied to the first pin port 131 (i.e. Figure 3 The second relay switch 132 (i.e., PIN1) is connected to PIN1. Figure 3The SW_H1 pin is closed, controlling the connection with the second pin port 131 (i.e. Figure 3 The third relay switch 133 (i.e., PIN2) is connected to PIN2. Figure 3 When SW_L2 is closed, the resistance measured is the resistance between the two pins connected to the first pin port 131 (PIN1) and the second pin port 131 (PIN2) of the connector. That is, the impedance between pin 1 and pin 2 of the connector, which can be equivalent to... Figure 3 The resistor connected to the right of PIN1 and PIN2 (i.e., the resistor under test) receives current from operational amplifier 124 along... Figure 3 The dotted lines in the diagram indicate that after the current flows through the resistor under test, it flows to ground via SW_L2. The grounding terminals of the analog-to-digital converter 125 and the resistor under test are connected together through the second relay switch 132SW_H1 and the third relay switch 133SW_L2, thus achieving a common ground connection between the analog-to-digital converter 125 and the resistor under test. Therefore, when the current flows to ground through the resistor under test, the potential at the analog-to-digital converter 125 changes, and this potential signal is transmitted to the main controller 110 so that the main controller 110 can obtain the relevant parameters of the resistor under test. Thus, according to the voltage divider principle: Rx = V ADC / ( V DAC - V ADC By multiplying the voltage signal by 1 kΩ, the resistance value of the resistor being measured (i.e., the impedance between the pins on the connector) can be obtained. In actual processing, the main controller 110 can process the voltage signal according to the voltage divider principle and directly output the resistance value of the resistor being measured. Alternatively, it can convert the acquired voltage signal (V... DAC and V ADC The data is further transmitted to an external processing device so that the external processing device can calculate the resistance value of the measured resistor.

[0020] Please refer to further information. Figure 4The PCBA connector pin impedance automatic detection device also includes an adapter board 200 for electrical connection with the connector under test (board 10). The adapter board 200 is electrically connected to the measurement board 100. By setting the adapter board 200, it can adapt to the pin impedance measurement of various connector models. Furthermore, the input end of the adapter board 200 has an input port that corresponds to each pin port. The output end of the adapter board 200 has N output ports connected in parallel for each input port. The N output ports are electrically connected to their corresponding input ports, where N is an integer greater than or equal to 2. In this embodiment, the N output ports corresponding to the same input port are different. Thus, when the connector specifications change, the connector pins can be connected to the corresponding output ports, allowing the automatic detection device to match various connectors, thereby expanding the applicability of the automatic detection device and improving its versatility. When a new model of connector needs to be measured, the adapter board 200 can be replaced. In addition, in this embodiment, the output ports of the adapter board 200 are electrically connected to the pins of the connector under test via a flexible flat cable 300. In this way, while satisfying the connection between the connector pins and the output port of the adapter board 200, the flexible flat cable 300 has good flexibility and can adapt to various different placement positions of the adapter board 200 and the connector, so that the adapter board 200 and the connector can be installed in a different position or angle, thereby reducing the difficulty of connecting the adapter board 200 and the connector.

[0021] It should be noted that in other embodiments, the automatic detection device also includes a display device for displaying the detection results. For example, a display electrically connected to the main controller can be used to display the measurement results of the impedance between connector pins. Additionally, an external control device or processing device can be connected to the main controller to further process the collected impedance data between pins. For example, a PC 400 electrically connected to the main controller can be used. During the impedance measurement of the connector pins, the PC 400 can send commands to the main controller one by one. After receiving the commands, the main controller can control the relay drive circuit to select the corresponding pins for detection. Alternatively, the PC 400 can write the pin selection commands to the main controller all at once, enabling the main controller to automatically select pins and achieve automatic measurement of the impedance between pins. After receiving the signal from the analog-to-digital converter, the main controller uploads the results to the display device for display, or uploads the results to the PC 400. The PC 400 then determines whether the impedance between the pins is abnormal according to preset judgment criteria, thereby improving the rework efficiency of the connector.

[0022] The PCBA connector pin-to-pin impedance automatic detection device of this utility model includes a main controller 110, a range selection circuit 120, a pin selection circuit 130, and a relay drive circuit 140. The relay drive circuit 140 controls the opening and closing of corresponding relay switches on the range selection circuit 120 and the pin selection circuit 130, enabling the selection of the measurement range during impedance measurement and measuring the impedance between preset pins. It eliminates the need for manual measurement of each pin of the connector, realizing automatic measurement of the impedance between connector pins. This effectively solves the problem of inconvenience caused by the increase in the number of connector pins and the decrease in pin spacing, and helps to improve the measurement efficiency of PCBA connector pin-to-pin impedance.

[0023] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0024] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An automatic impedance detection device for PCBA connector pins, characterized in that, The device includes a measuring board with a measuring circuit. The measuring circuit includes a main controller, a gear selection circuit electrically connected to the main controller, a pin selection circuit electrically connected to both the gear selection circuit and the main controller, and a relay drive circuit electrically connected to the main controller. The gear selection circuit includes multiple gear channels connected in parallel. Each gear channel includes a gear resistor and a first relay switch connected in series with the gear resistor. The resistance values ​​of each gear resistor are different. The pin selection circuit includes several pin channels connected in parallel. Each pin channel includes a pin port for electrical connection to the pins of the connector under test, a second relay switch connected in series between the pin port and the gear selection circuit, and a third relay switch disposed between the pin port and the second relay switch and grounded. The relay drive circuit is electrically connected to each of the first, second, and third relay switches.

2. The automatic impedance detection device between PCBA connector pins according to claim 1, characterized in that, The gear selection circuit further includes a digital-to-analog converter electrically connected to the main controller, an operational amplifier electrically connected to the digital-to-analog converter, and an analog-to-digital converter electrically connected to the main controller and grounded to each pin port. The digital-to-analog converter is electrically connected to the gear position resistor on each gear position channel.

3. The automatic impedance detection device between PCBA connector pins according to claim 1, characterized in that, The gear selection circuit includes three gear channels, and the resistance values ​​of the three gear resistors are 100Ω, 1kΩ, and 10kΩ, respectively.

4. The automatic impedance detection device between PCBA connector pins according to claim 1, characterized in that, The pin selection circuit includes 50 pin channels connected in parallel.

5. The automatic impedance detection device between PCBA connector pins according to claim 1, characterized in that, The PCBA connector pin impedance automatic detection device also includes an adapter board for electrical connection with the connector under test, the adapter board being electrically connected to the measuring board.

6. The automatic impedance detection device between PCBA connector pins according to claim 5, characterized in that, The adapter board has an input port that is electrically connected to each pin port. The adapter board has N output ports connected in parallel for each input port. The N output ports are electrically connected to their corresponding input ports, where N is an integer greater than or equal to 2.

7. The automatic impedance detection device between PCBA connector pins according to claim 6, characterized in that, The output port of the adapter board is electrically connected to the pins of the connector under test via a flexible flat cable.

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