Power supply PCB detection device and method

Abstract

The invention provides a power supply PCB detection device and method, and relates to the technical field of electronics, and the method comprises the steps: an impedance detection module detects the first impedance of the input end of a to-be-detected power supply PCB and the second impedance of the output end of the to-be-detected power supply PCB, and transmits an impedance detection result to a processing module; the power-on test module is used for supplying power to a power supply PCB to be tested, collecting a first output voltage under a no-load condition, and transmitting a power-on test result to the processing module. The on-load test module connects the output end of the to-be-tested power supply PCB to a load, tests a second output voltage, and transmits an on-load test result to the processing module; the processing module judges whether short circuit abnormity exists according to the impedance detection result, judges whether no-load performance is abnormal according to the power-on test result, and judges whether on-load performance is abnormal according to the on-load test result. By implementing the technical scheme of the invention, the effect of improving the detection efficiency of the power supply PCB is achieved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and particularly to a detection device and method for a power supply PCB board. Background Art

[0002] In the production and testing process of PCB (Printed Circuit Board), detecting the welding quality and normal function of the circuit board is a key link. Currently, the existing detection technologies mainly rely on manual operation. The welding condition of the PCB board is observed by eyes, and the output voltage is manually collected to judge whether the board is working properly. This method not only has low efficiency, but is also easily affected by human factors, resulting in insufficient detection accuracy. Especially in complex PCB boards, subtle welding problems or circuit short circuits are difficult to be detected. In addition, manual detection cannot achieve automation, which is difficult to meet the requirements of large-scale production, consuming a large amount of manpower and having a slow detection speed. Summary of the Invention

[0003] The purpose of this application is to overcome the above technical problems, and this application provides a detection device and method for a power supply PCB board.

[0004] In a first aspect, this application provides a detection device for a power supply PCB board, including: an impedance detection module, configured to detect a first impedance at the input end and a second impedance at the output end of the power supply PCB board to be detected, and transmit the impedance detection result to the processing module, where the impedance detection result includes the first impedance and the second impedance; a power-on test module, configured to supply power to the power supply PCB board to be detected through a target relay, and collect a first output voltage of the power supply PCB board to be detected under no-load condition, and transmit the power-on test result to the processing module, where the power-on test result includes the first output voltage; a loaded test module, configured to connect the output end of the power supply PCB board to be detected to a load, and test a second output voltage of the power supply PCB board to be detected, and transmit the loaded test result to the processing module, where the loaded test result includes the second output voltage; a processing module, electrically connected to the impedance detection module, the power-on test module, and the loaded test module respectively, and the processing module is configured to perform the following operations: judge whether there is a short-circuit abnormality in the power supply PCB board to be detected according to the impedance detection result; judge whether the no-load performance of the power supply PCB board to be detected is abnormal according to the power-on test result; judge whether the loaded performance of the power supply PCB board to be detected is abnormal according to the loaded test result.

[0005] By adopting the above technical solutions, a comprehensive automated detection of the power supply PCB board can be achieved. Specifically, the impedance detection module can accurately measure the impedance of the input and output ends of the power supply PCB board to be tested, thereby effectively determining whether there is a short - circuit abnormality; the power - on test module supplies power to the PCB board and collects the first output voltage under no - load conditions to ensure that its no - load performance meets the expected standards; the loaded - test module further tests the second output voltage after connecting a load to verify the actual load - carrying capacity of the PCB board. This multi - dimensional detection method significantly improves the detection efficiency, reduces the errors caused by manual intervention, and is suitable for the quality control requirements of large - scale production.

[0006] Optionally, the impedance detection module includes: a first voltage follower, a second voltage follower, a first relay, a second relay, a first reference resistor, a second reference resistor, a first differential amplifier, and a second differential amplifier. Among them, the output end of the first voltage follower is electrically connected to the positive pole of the input end of the power supply PCB board to be tested. The negative pole of the input end of the power supply PCB board to be tested is sequentially connected to the ground terminal through the first relay and the first reference resistor. The first reference resistor is connected in series with the first relay. The first differential amplifier is used to collect the first reference voltage across the first reference resistor. Among them, the first voltage follower is used to output the first test voltage; the output end of the second voltage follower is electrically connected to the positive pole of the output end of the power supply PCB board to be tested. The negative pole of the output end of the power supply PCB board to be tested is sequentially connected to the ground terminal through the second relay and the second reference resistor. The second reference resistor is connected in series with the second relay. The second differential amplifier is used to collect the second reference voltage across the second reference resistor. Among them, the second voltage follower is used to output the second test voltage; the impedance detection module is used to obtain the first impedance based on the first test voltage, the first reference voltage, the resistance value of the first reference resistor, and the amplification factor of the first differential amplifier, and obtain the second impedance based on the second test voltage, the second reference voltage, the resistance value of the second reference resistor, and the amplification factor of the second differential amplifier.

[0007] By adopting the above technical solutions, the impedance detection module can accurately measure the impedance of the input and output ends of the power supply PCB board to be tested. Specifically, the first voltage follower, in cooperation with the first relay, the first reference resistor, and the first differential amplifier, can accurately obtain the first impedance of the input end; similarly, the second voltage follower, in cooperation with the second relay, the second reference resistor, and the second differential amplifier, can accurately measure the second impedance of the output end. This technical solution effectively improves the accuracy of impedance measurement, helps to quickly identify whether there is a short - circuit abnormality on the PCB board, thereby improving the detection efficiency and reliability.

[0008] Optionally, the power-on test module includes a first voltage dividing circuit and a first filtering circuit. Among them, the first input terminal of the first voltage dividing circuit is electrically connected to the positive electrode of the output terminal of the power supply PCB under test, and the second input terminal of the first voltage dividing circuit and the negative electrode of the output terminal of the power supply PCB under test are both electrically connected to the ground terminal. The voltage dividing output terminal of the first voltage dividing circuit is electrically connected to the first AD port of the processing module through the first filtering circuit. Among them, the processing module obtains the first output voltage through the first AD port.

[0009] By adopting the above technical solution, it is possible to accurately collect the output voltage of the power supply PCB under test under no-load conditions. Specifically, the first voltage dividing circuit reasonably distributes the output voltage of the power supply PCB under test, avoiding direct entry of excessive voltage into the processing module and causing damage, while ensuring that the voltage signal adapts to the subsequent processing requirements. The first filtering circuit further eliminates interference signals, improves the stability and accuracy of voltage sampling, and thus enhances the reliability of the no-load performance judgment.

[0010] Optionally, the first voltage dividing circuit includes a first resistor and a second resistor, and the first filtering circuit includes a third resistor and a first capacitor. Among them, the first end of the first resistor is electrically connected to the positive electrode of the output port of the power supply PCB under test, and the second end of the first resistor is electrically connected to the ground terminal through the second resistor. The second end of the first resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the first AD port, and the first capacitor is connected between the second end of the third resistor and the ground terminal.

[0011] By adopting the above technical solution, the first voltage dividing circuit composed of the first resistor and the second resistor can effectively reduce the high voltage at the output port of the power supply PCB under test, protecting the subsequent circuit from excessive voltage impact. At the same time, the first filtering circuit composed of the third resistor and the first capacitor further eliminates the noise interference in the signal, ensuring that the first output voltage data transmitted to the processing module is more stable and reliable. This helps to improve the accuracy of the entire detection device's evaluation of the no-load performance of the power supply PCB, thereby enhancing the detection efficiency and quality. This technical solution can achieve precise collection and filtering of the output voltage of the power supply PCB under test.

[0012] Optionally, the power-on test module further includes a first isolation circuit. The first filter circuit is electrically connected to the first AD port through the first isolation circuit. The first isolation circuit includes a first operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a fourth capacitor, and a first transient suppression diode. The output terminal of the first filter circuit is sequentially connected to the non-inverting input terminal of the first operational amplifier through the fourth resistor and the fifth resistor. The fourth resistor and the fifth resistor are connected in series. The second capacitor is connected between the connection point between the fourth resistor and the fifth resistor and the output terminal of the first operational amplifier. The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the first operational amplifier. The third capacitor is connected between the non-inverting input terminal of the first operational amplifier and the ground terminal. The output terminal of the first operational amplifier is electrically connected to the first end of the sixth resistor. The second end of the sixth resistor is electrically connected to the first AD port. The fourth capacitor is connected between the second end of the sixth resistor and the ground terminal. The first transient suppression diode is connected between the second end of the sixth resistor and the ground terminal.

[0013] By adopting the above technical solution, the first isolation circuit effectively reduces noise interference and improves the stability of signal transmission by using the first operational amplifier and its peripheral components. The fourth resistor and the fifth resistor form a voltage division network, and cooperate with the second capacitor to form a feedback loop, further enhancing the anti-noise ability of the circuit and ensuring the accurate sampling of the output voltage of the power supply PCB under test. The third capacitor is connected between the non-inverting input terminal of the first operational amplifier and the ground terminal, which plays a role in filtering high-frequency clutter signals and improving the signal purity. The sixth resistor limits the current flowing into the first AD port, and the fourth capacitor and the first transient suppression diode work together to quickly absorb surge voltage and protect the processing module from damage. This technical solution realizes the electrical isolation between the first filter circuit and the first AD port in the power-on test module, significantly improving the data accuracy and system reliability during the power-on test process.

[0014] Optionally, the load test module includes a third relay and an RS232 communication interface. The load test module is connected to the load through the RS232 communication interface. The output terminal of the power supply PCB under test is connected to the load through the third relay. The third relay is used to control the connection or disconnection of the load.

[0015] By adopting the above technical solution, automatic control of load connection during the on-load performance test of the power supply PCB under test is achieved. Among them, the third relay can accurately control the on or off state of the load and the output end of the power supply PCB under test, thus avoiding misoperations and time delays that may be caused by manual intervention, and improving the test efficiency and reliability. At the same time, the RS232 communication interface provides a stable and reliable communication channel for data interaction between the on-load test module and external load devices, ensuring the accuracy of test parameter settings and result feedback. This technical solution significantly improves the operation convenience and intelligent level of the power supply PCB board detection device.

[0016] Optionally, the on-load test module is also used to test the target output current of the power supply PCB under test when a load is connected to the output port of the power supply PCB under test, and the on-load test result also includes the target output current.

[0017] By adopting the above technical solution, during the detection process of the power supply PCB board, not only the output voltage under on-load conditions can be measured, but also the target output current can be further tested. This enables the detection device to more comprehensively evaluate the performance of the power supply PCB board under actual load conditions, ensuring its output stability and reliability. Specifically, after adding the test function of the target output current, problems such as overcurrent or undercurrent can be effectively detected when the power supply PCB board bears a specific load, so as to more accurately judge whether the on-load capacity of the power supply PCB board meets the design requirements, and the power efficiency of the power supply PCB under test can be evaluated. This enhanced detection mechanism significantly improves the accuracy and integrity of the detection, providing a strong guarantee for product quality.

[0018] Optionally, the processing module determines whether the power supply PCB under test is abnormal in the following manner: when the impedance detection result indicates that the first impedance or the second impedance is less than the preset impedance threshold, it is determined that the power supply PCB under test has a short-circuit abnormality; when the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that the no-load performance of the power supply PCB under test is abnormal; when the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that the on-load performance of the power supply PCB under test is abnormal.

[0019] By adopting the above technical solutions, through the analysis of the impedance detection results, it is possible to accurately determine whether there is a short - circuit abnormality in the power supply PCB to be tested, effectively avoiding the problem of function failure caused by short - circuit; by comparing the difference between the first output voltage and the preset voltage, the performance stability of the power supply PCB to be tested under no - load conditions can be accurately evaluated to ensure that it meets the design expectations; by comparing the difference between the second output voltage and the preset voltage, the performance of the power supply PCB to be tested under loaded conditions is further verified to ensure its reliability in the actual use environment. Through this detection device, a full - range and high - precision quality detection of the power supply PCB to be tested is achieved, which can automatically detect various performance states of the power supply PCB, significantly improving the detection efficiency and accuracy and reducing the uncertainty brought by manual participation.

[0020] In the second aspect of the present application, a detection method for a power supply PCB is also provided, which is applied to the detection device for a power supply PCB in any of the foregoing items, and includes: using the impedance detection module to respectively detect the first impedance at the input end and the second impedance at the output end of the power supply PCB to be tested, obtaining the impedance detection results, and transmitting the impedance detection results to the processing module, where the impedance detection results include the first impedance and the second impedance; the processing module determines whether there is a short - circuit abnormality in the power supply PCB to be tested according to the impedance detection results, and in the case of determining that there is no short - circuit abnormality in the power supply PCB to be tested, uses the power - on test module to collect the power - on test results of the power supply PCB to be tested under no - load conditions, and transmits the power - on test results to the processing module, where the power - on test results include the first output voltage; the processing module determines whether the no - load performance of the power supply PCB to be tested is abnormal according to the power - on test results, and in the case of determining that the no - load performance of the power supply PCB to be tested is normal, connects a load to the output port of the power supply PCB to be tested through the loaded test module, tests the loaded test results of the power supply PCB to be tested, and transmits the loaded test results to the processing module, where the loaded test results include the second output voltage; the processing module determines whether the loaded performance of the power supply PCB to be tested is abnormal according to the loaded test results.

[0021] By adopting the above technical solutions, the impedance detection module can accurately measure the impedance of the input and output ends of the power supply PCB to be tested and transmit it to the processing module, thereby effectively determining whether there is a short - circuit abnormality and avoiding the problem of easy omission in traditional manual visual inspection; the power - on test module can accurately evaluate whether the no - load performance of the power supply PCB is normal by collecting the output voltage in the no - load state and transmitting it to the processing module, ensuring that its basic electrical characteristics meet the design requirements; the load - carrying test module introduces an actual load environment, further verifies the load - carrying capacity of the power supply PCB under real working conditions, and completes a comprehensive determination in combination with the processing module to ensure product reliability; the entire process can automatically complete the detection of multiple key indicators without manual intervention, greatly reducing the investment in human resources, while improving the consistency and repeatability of detection, and is particularly suitable for the requirements of large - scale industrial production.

[0022] Optionally, the above method further includes at least one of the following: when it is determined that the first impedance or the second impedance is less than a preset impedance threshold, it is determined that there is a short - circuit abnormality in the power supply PCB to be tested; when it is determined that the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that the no - load performance of the power supply PCB to be tested is abnormal; when it is determined that the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that the load - carrying performance of the power supply PCB to be tested is abnormal.

[0023] In the third aspect of the present application, an electronic device is further provided, including a memory and a processor. A computer program is stored on the memory, and when the processor executes the program, the method steps of any one of the above are implemented.

[0024] In the fourth aspect of the present application, a computer - readable storage medium is further provided. The computer - readable storage medium stores instructions, and when the instructions are executed, the method steps of any one of the above are executed.

[0025] In summary, one or more technical solutions provided in the present application have at least the following technical effects or advantages: 1. It can achieve a comprehensive and automated detection of the power supply PCB. Among them, the impedance detection module can accurately measure the impedance of the input and output ends of the power supply PCB to be tested, thereby effectively determining whether there is a short - circuit abnormality; the power - on test module supplies power to the PCB and collects the first output voltage in the no - load state to ensure that its no - load performance meets the expected standard; the load - carrying test module further tests the second output voltage after connecting the load to verify the actual load - carrying capacity of the PCB. This multi - dimensional detection method significantly improves the detection accuracy and efficiency, reduces the errors caused by manual intervention, and is suitable for the quality control requirements of large - scale production. 2. The impedance detection module can accurately measure the impedance at the input and output ends of the power supply PCB under test, which helps to quickly identify whether there is a short - circuit abnormality in the PCB, thereby improving the detection efficiency and reliability; 3. Through the first voltage - dividing circuit and the first filtering circuit, the stability and accuracy of voltage sampling are improved, thereby enhancing the reliability of the no - load performance judgment; 4. It realizes a comprehensive and high - precision quality inspection of the power supply PCB under test, can automatically detect various performance states of the power supply PCB, significantly improves the detection efficiency and accuracy, and reduces the uncertainty brought by manual participation. Description of the Drawings

[0026] Figure 1 is the overall framework diagram of a detection device for a power supply PCB provided by an embodiment of the present application; Figure 2 is the flowchart of a detection method for a power supply PCB provided by an embodiment of the present application; Figure 3 is the schematic diagram of a PCB detection system provided by an embodiment of the present application; Figure 4 is the schematic diagram of an impedance detection circuit provided by an embodiment of the present application; Figure 5 is the example diagram of a power - on test circuit provided by an embodiment of the present application; Figure 6 is another example diagram of a power - on test circuit provided by an embodiment of the present application; Figure 7 is the schematic diagram of a loaded - test circuit provided by an embodiment of the present application; Figure 8 is the schematic diagram of the process of PCB detection provided by an embodiment of the present application.

[0027] Description of the Reference Numerals: R1 - the first resistor, R2 - the second resistor, R3 - the third resistor, R4 - the fourth resistor, R5 - the fifth resistor, R6 - the sixth resistor, C1 - the first capacitor, C2 - the second capacitor, C3 - the third capacitor, C4 - the fourth capacitor, TVS1 - the first transient voltage suppression diode, U1 - the first operational amplifier. Detailed Embodiments

[0028] In order to enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this specification in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0029] In the description of the embodiments of the present application, words such as "for example" or "for illustration" are used to give examples, illustrations or explanations. Any embodiment or design solution described as "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "for example" or "for illustration" is intended to present relevant concepts in a specific manner.

[0030] In the description of the embodiments of the present application, the term "a plurality" means two or more. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the technical features indicated. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] The present application provides a detection device for a power supply PCB board. Referring to Figure 1 , Figure 1 is an overall framework diagram of a detection device for a power supply PCB board provided by an embodiment of the present application. The device includes: an impedance detection module, configured to detect a first impedance at the input end and a second impedance at the output end of the power supply PCB board to be tested, and transmit the impedance detection result to the processing module, where the impedance detection result includes the first impedance and the second impedance; a power-on test module, configured to supply power to the power supply PCB board to be tested through a target relay, and collect a first output voltage of the power supply PCB board to be tested under no-load conditions, and transmit the power-on test result to the processing module, where the power-on test result includes the first output voltage; a loaded test module, configured to connect the output end of the power supply PCB board to be tested to a load, and test a second output voltage of the power supply PCB board to be tested, and transmit the loaded test result to the processing module, where the loaded test result includes the second output voltage; a processing module, electrically connected to the impedance detection module, the power-on test module and the loaded test module respectively. The processing module is configured to perform the following operations: determine whether there is a short-circuit abnormality in the power supply PCB board to be tested according to the impedance detection result; determine whether the no-load performance of the power supply PCB board to be tested is abnormal according to the power-on test result; determine whether the loaded performance of the power supply PCB board to be tested is abnormal according to the loaded test result.

[0032] In the above embodiments, a comprehensive automated detection of the power supply PCB board can be achieved. Specifically, the impedance detection module can accurately measure the impedance of the input and output ends of the power supply PCB board to be tested, namely the first impedance and the second impedance, and transmit this data to the processing module. By analyzing the impedance values, it can be determined whether there is a short circuit abnormality in the power supply PCB board to be tested. For example, if the value of the first impedance or the second impedance is very small (such as less than the preset impedance threshold), it indicates that there may be a short circuit in the power supply PCB board to be tested; the power-on test module supplies power to the power supply PCB board to be tested through the target relay, collects the first output voltage under no-load conditions, and transmits the result to the processing module for verifying whether the no-load performance of the power supply PCB board to be tested is abnormal. The no-load voltage is the output voltage of the power supply (i.e., the above-mentioned power supply PCB board to be tested) when there is no load, and it should be close to the rated value under normal circumstances. By detecting the no-load voltage (i.e., the above-mentioned first output voltage), it can be determined whether the no-load performance of the power supply is abnormal; the load test module further connects the power supply PCB board to be tested to an actual load, tests its second output voltage, and feeds back the result to the processing module, simulating the load situation in the actual use environment, so as to more comprehensively evaluate whether the load performance of the power supply PCB board is abnormal. The load performance is a key indicator in the actual working state of the power supply. By detecting the load voltage (i.e., the above-mentioned second output voltage), it can be determined whether the power supply can work stably under load. The above-mentioned power supply PCB board to be tested can be a DC / DC power circuit board, either DC / DC boost or buck. Through this embodiment, the errors caused by human factors in the traditional manual detection method are avoided, the detection efficiency and accuracy are improved, an automated detection process is realized, subtle welding problems or circuit short circuits can be quickly identified, and it is especially suitable for the detection of complex PCB boards; the needs of large-scale production are met, the labor cost is reduced, and the detection speed is increased. The processing module makes a judgment based on the accurate detection results transmitted by each module, can accurately find the problems existing in the PCB board, and improves the accuracy and reliability of the detection. Through multi-dimensional detection (such as impedance detection, no-load test, load test) in this embodiment, a comprehensive and accurate performance evaluation of the power supply PCB board is realized; the design of the automated process not only improves the work efficiency, but also ensures the consistency and reliability of each test, which helps to improve the product quality.

[0033] The impedance detection module is used to measure the impedance of the input and output ends of the power supply PCB board to be tested, namely the first impedance and the second impedance, and transmit this data to the processing module. By analyzing the impedance values, it can be determined whether there is a short circuit abnormality in the power supply PCB board to be tested. For example, if the value of the first impedance or the second impedance is very small (such as less than the preset impedance threshold), it indicates that there may be a short circuit in the power supply PCB board to be tested; the power-on test module supplies power to the power supply PCB board to be tested through the target relay, collects the first output voltage under no-load conditions, and transmits the result to the processing module for verifying whether the no-load performance of the power supply PCB board to be tested is abnormal. The no-load voltage is the output voltage of the power supply (i.e., the above-mentioned power supply PCB board to be tested) when there is no load, and it should be close to the rated value under normal circumstances. By detecting the no-load voltage (i.e., the above-mentioned first output voltage), it can be determined whether the no-load performance of the power supply is abnormal; the load test module further connects the power supply PCB board to be tested to an actual load, tests its second output voltage, and feeds back the result to the processing module, simulating the load situation in the actual use environment, so as to more comprehensively evaluate whether the load performance of the power supply PCB board is abnormal. The load performance is a key indicator in the actual working state of the power supply. By detecting the load voltage (i.e., the above-mentioned second output voltage), it can be determined whether the power supply can work stably under load. The above-mentioned power supply PCB board to be tested can be a DC / DC power circuit board, either DC / DC boost or buck. Through this embodiment, the errors caused by human factors in the traditional manual detection method are avoided, the detection efficiency and accuracy are improved, an automated detection process is realized, subtle welding problems or circuit short circuits can be quickly identified, and it is especially suitable for the detection of complex PCB boards; the needs of large-scale production are met, the labor cost is reduced, and the detection speed is increased. The processing module makes a judgment based on the accurate detection results transmitted by each module, can accurately find the problems existing in the PCB board, and improves the accuracy and reliability of the detection. Through multi-dimensional detection (such as impedance detection, no-load test, load test) in this embodiment, a comprehensive and accurate performance evaluation of the power supply PCB board is realized; the design of the automated process not only improves the work efficiency, but also ensures the consistency and reliability of each test, which helps to improve the product quality.

[0034] In an optional embodiment, the impedance detection module includes: a first voltage follower, a second voltage follower, a first relay, a second relay, a first reference resistor, a second reference resistor, a first differential amplifier, and a second differential amplifier. Among them, the output terminal of the first voltage follower is electrically connected to the positive electrode of the input terminal of the power supply PCB under test. The negative electrode of the input terminal of the power supply PCB under test is sequentially connected to the ground terminal through the first relay and the first reference resistor. The first reference resistor is connected in series with the first relay. The first differential amplifier is used to collect the first reference voltage across the first reference resistor. Among them, the first voltage follower is used to output the first test voltage. The output terminal of the second voltage follower is electrically connected to the positive electrode of the output terminal of the power supply PCB under test. The negative electrode of the output terminal of the power supply PCB under test is sequentially connected to the ground terminal through the second relay and the second reference resistor. The second reference resistor is connected in series with the second relay. The second differential amplifier is used to collect the second reference voltage across the second reference resistor. Among them, the second voltage follower is used to output the second test voltage. The impedance detection module is used to obtain the first impedance based on the first test voltage, the first reference voltage, the resistance value of the first reference resistor, and the amplification factor of the first differential amplifier, and obtain the second impedance based on the second test voltage, the second reference voltage, the resistance value of the second reference resistor, and the amplification factor of the second differential amplifier.

[0035] In the above embodiment, the impedance detection module can accurately measure the impedance of the input terminal and the output terminal of the power supply PCB under test. Specifically, the first voltage follower, in cooperation with the first relay, the first reference resistor, and the first differential amplifier, can accurately obtain the first impedance of the input terminal. Similarly, the second voltage follower, in cooperation with the second relay, the second reference resistor, and the second differential amplifier, can accurately measure the second impedance of the output terminal. This embodiment effectively improves the accuracy of impedance measurement, helps to quickly identify whether there is a short circuit abnormality in the PCB, thereby improving the detection efficiency and reliability.

[0036] Voltage followers (such as the first voltage follower and the second voltage follower) are amplifiers with high input impedance and low output impedance. Their output voltage is almost equal to the input voltage. The function of the voltage followers in this embodiment is to provide stable test voltages (such as the above-mentioned first test voltage and second test voltage) for the input and output ends of the power supply PCB under test, while isolating the signal source and avoiding the influence of the load on the signal source. The reference resistors (such as the above-mentioned first reference resistor and second reference resistor) are resistors with known resistance values, which are used to construct a current loop. By measuring the voltage across the reference resistor, the current flowing through the reference resistor can be calculated. The relays (such as the above-mentioned first relay and second relay) are used to control the access and disconnection of the reference resistors, realizing the automation of the measurement process. The closing and opening of the relays can be controlled by a processing module or other control signals, improving the flexibility and efficiency of detection. In practical applications, the first impedance at the input end and the second impedance at the output end can be respectively tested by controlling the first relay and the second relay. For example, when the first relay is closed, current will flow through the first reference resistor, and the first differential amplifier is used to collect the first reference voltage across the first reference resistor; when the second relay is closed, current flows through the second reference resistor, and the second differential amplifier collects the second reference voltage across the second reference resistor. The differential amplifiers (such as the above-mentioned first differential amplifier and second differential amplifier) are used to accurately measure the voltage difference across the reference resistor (such as the above-mentioned first reference voltage and second reference voltage). The differential amplifier can effectively suppress common-mode interference and improve the measurement accuracy. Finally, according to Ohm's law, the impedance at the input or output end of the power supply PCB under test can be calculated. By using the voltage follower to stabilize the voltage and the differential amplifier to accurately collect the reference voltage, combined with the known resistance value and amplification factor of the reference resistor, the impedance at the input and output ends of the PCB can be accurately calculated, providing a reliable data basis for subsequent fault judgment. In this embodiment, through the combination of the differential amplifier and the reference resistor, common-mode interference is effectively suppressed, the accuracy of impedance measurement is improved, and short-circuit or open-circuit problems can be detected more accurately; by controlling the access and disconnection of the reference resistor through the relay, the automation of the measurement process is realized, manual operation is reduced, and the detection efficiency is improved; by isolating the signal source through the voltage follower, the stability and accuracy of the measurement signal are ensured, the impedance measurement requirements of complex circuits can be adapted, and the reliability of detection is improved.

[0037] In an alternative embodiment, the power-on test module includes a first voltage-dividing circuit and a first filtering circuit. Among them, the first input end of the first voltage-dividing circuit is electrically connected to the positive pole of the output end of the power supply PCB under test, the second input end of the first voltage-dividing circuit and the negative pole of the output end of the power supply PCB under test are both electrically connected to the grounding end, and the voltage-dividing output end of the first voltage-dividing circuit is electrically connected to the first AD port of the processing module through the first filtering circuit; wherein, the processing module obtains the first output voltage through the first AD port.

[0038] In the above embodiments, it is possible to accurately collect the output voltage of the power supply PCB under test in the no-load condition. Specifically, the first voltage division circuit reasonably distributes the output voltage of the power supply PCB under test, avoiding direct entry of excessive voltage into the processing module and causing damage, while ensuring that the voltage signal adapts to the subsequent processing requirements. The first filtering circuit further eliminates interference signals, improving the stability and accuracy of voltage sampling, thereby enhancing the reliability of the no-load performance judgment.

[0039] The first input terminal of the first voltage division circuit is connected to the positive electrode of the output terminal of the power supply PCB under test, and the second input terminal of the first voltage division circuit is connected to the negative electrode of the output terminal of the power supply PCB under test and grounded. The voltage division circuit usually consists of multiple resistors. According to the principle of series resistor voltage division, when the power supply voltage is constant, by reasonably setting the resistance value ratio of the resistors, the relatively high voltage output by the power supply PCB under test can be reduced to a voltage range suitable for subsequent circuit processing at a certain ratio, facilitating measurement and processing. This can ensure that the voltage input to the subsequent circuit is within a safe and processable range, avoiding damage to circuit components by excessive voltage or exceeding the measurement range of the measuring device. The voltage division output terminal of the first voltage division circuit is electrically connected to the first AD port of the processing module through the first filtering circuit. The function of the filtering circuit is to filter out the noise and interference signals in the voltage after voltage division, making the output voltage signal more stable and pure. The filtered voltage signal is input to the first AD port of the processing module, and the processing module can obtain the accurate value of the first output voltage, thereby performing subsequent analysis and judgment. In this embodiment, the first voltage division circuit accurately divides the output voltage of the power supply PCB under test, and then filters out the interference through the filtering circuit, enabling the processing module to obtain the accurate value of the first output voltage through the first AD port, providing an accurate data basis for judging whether the no-load performance of the power supply PCB under test is abnormal; the power-on test module in this embodiment can automatically complete the processes of voltage division, filtering, and transmission to the processing module of the output voltage, without the need for cumbersome manual operations, improving the detection efficiency, further enhancing the automation level of the entire power supply PCB board detection device, and being conducive to rapid detection in large-scale production.

[0040] In an alternative embodiment, as Figure 5 shown, the first voltage division circuit includes a first resistor R1 and a second resistor R2, and the first filtering circuit includes a third resistor R3 and a first capacitor C1; wherein, the first end of the first resistor R1 is electrically connected to the positive electrode of the output port of the power supply PCB under test, and the second end of the first resistor R1 is electrically connected to the ground terminal through the second resistor R2; the second end of the first resistor R1 is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected to the first AD port, and the first capacitor C1 is connected between the second end of the third resistor R3 and the ground terminal.

[0041] In the above embodiments, the first voltage dividing circuit composed of the first resistor R1 and the second resistor R2 can effectively reduce the high voltage at the output port of the PCB board of the power supply under test, protecting the subsequent circuit from being impacted by excessive voltage; meanwhile, the first filtering circuit composed of the third resistor R3 and the first capacitor C1 further eliminates the noise interference in the signal, ensuring that the first output voltage data transmitted to the processing module is more stable and reliable. This helps improve the accuracy of the entire detection device in evaluating the no-load performance of the PCB board of the power supply, thereby enhancing the detection efficiency and quality. This embodiment can achieve accurate acquisition and filtering of the output voltage of the PCB board of the power supply under test.

[0042] The first resistor R1 and the second resistor R2 form the first voltage dividing circuit. By reasonably selecting the resistance values of the first resistor R1 and the second resistor R2, the relatively high voltage output by the PCB board of the power supply under test can be divided by a specific ratio to obtain a voltage value suitable for subsequent circuit processing and measurement; the third resistor R3 and the first capacitor C1 form a filtering circuit, which can filter out the high-frequency clutter and interference in the voltage signal, making the voltage signal output to the first AD port smoother and more stable, facilitating the processing module to accurately obtain the first output voltage. Figure 5 In the formula, VUSE represents the voltage at the output end of the PCB board of the power supply under test, and ADC_PWR_USE represents the output voltage obtained after voltage division and filtering, which is used to input the first AD port of the processing module. This embodiment can accurately divide the output voltage of the PCB board of the power supply under test into a suitable range and efficiently filter out the interference signals therein, ensuring that the first output voltage data obtained by the processing module is accurate and stable, providing a reliable basis for subsequent judgment of the no-load performance of the PCB board of the power supply. Using a simple combination of resistors and capacitors to achieve the functions of voltage division and filtering reduces the circuit complexity and cost, while improving the economy of the system.

[0043] In an alternative embodiment, as Figure 6As shown, the power-on test module further includes a first isolation circuit. The first filter circuit is electrically connected to the first AD port through the first isolation circuit. Among them, the first isolation circuit includes a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a first transient suppression diode TVS1. Among them, the output terminal of the first filter circuit is sequentially electrically connected to the non-inverting input terminal of the first operational amplifier U1 through the fourth resistor R4 and the fifth resistor R5. The fourth resistor R4 and the fifth resistor R5 are connected in series. The second capacitor C2 is connected between the connection point between the fourth resistor R4 and the fifth resistor R5 and the output terminal of the first operational amplifier U1. The inverting input terminal of the first operational amplifier U1 is electrically connected to the output terminal of the first operational amplifier U1. The third capacitor C3 is connected between the non-inverting input terminal of the first operational amplifier U1 and the ground terminal. The output terminal of the first operational amplifier U1 is electrically connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is electrically connected to the first AD port. The fourth capacitor C4 is connected between the second end of the sixth resistor R6 and the ground terminal. The first transient suppression diode TVS1 is connected between the second end of the sixth resistor R6 and the ground terminal.

[0044] In the above embodiment, the first isolation circuit effectively reduces noise interference and improves the stability of signal transmission by using the first operational amplifier U1 and its peripheral components; the fourth resistor R4 and the fifth resistor R5 form a voltage dividing network, and cooperate with the second capacitor C2 to form a feedback loop, further enhancing the anti-noise ability of the circuit and ensuring the accurate sampling of the output voltage of the power supply PCB to be tested; the third capacitor C3 is connected between the non-inverting input terminal of the first operational amplifier U1 and the ground terminal, which plays a role in filtering high-frequency clutter signals and improving the signal purity; the sixth resistor R6 limits the current flowing into the first AD port, and the fourth capacitor C4 and the first transient suppression diode TVS1 work together to quickly absorb the surge voltage and protect the processing module from damage. Specifically, the cathode of the first transient suppression diode TVS1 is electrically connected to the second end of the sixth resistor R6, and the anode of the first transient suppression diode TVS1 is electrically connected to the ground terminal. Figure 6 The other peripheral circuits of the first operational amplifier U1 are of conventional configuration and will not be elaborated here. The rightmost output terminal of the 6 circuits in the figure is used to connect to the first AD port of the processing module. Figure 6 The leftmost input terminal in the figure can be connected to Figure 5 the rightmost output terminal, that is, connected to Figure 5 the second end of the third resistor R3 in

[0045] The first isolation circuit consists of a first operational amplifier U1 and its peripheral components (a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a first transient voltage suppressor diode TVS1). The first operational amplifier U1 is configured in a voltage follower mode, with its inverting input terminal connected to the output terminal to achieve high-impedance buffering of the input signal and low-impedance output. By dividing the voltage through the fourth resistor R4 and the fifth resistor R5, and with the feedback of the second capacitor C2, the input signal is further stabilized. The third capacitor C3 is connected between the non-inverting input terminal of the first operational amplifier U1 and the ground to filter out high-frequency noise. The signal after isolation and protection is transmitted to the first AD port of the processing module through the sixth resistor R6 to ensure the stability and reliability of the signal. The fourth capacitor C4 and the first transient voltage suppressor diode TVS1 are connected between the output terminal and the ground to suppress transient overvoltage and protect the subsequent circuit. In this embodiment, through the filtering, isolation, and stabilization effects of the first isolation circuit, the interference components in the signal can be effectively removed, making the voltage signal input to the first AD port of the processing module purer and more stable, thereby improving the accuracy of voltage acquisition and providing reliable data support for accurately judging the no-load performance of the power supply PCB board; the application of the first operational amplifier U1 effectively isolates the front and rear stage circuits, reduces the distortion and interference during signal transmission, ensures the accurate transmission of the signal, and improves the overall performance and stability of the detection device; the presence of the first transient voltage suppressor diode TVS1 provides overvoltage protection for the detection device, can effectively prevent the damage of transient overvoltage to key components such as the processing module, and improves the reliability and service life of the detection device.

[0046] In an alternative embodiment, the loaded test module includes a third relay and an RS232 communication interface. Among them, the loaded test module is connected to the load through the RS232 communication interface, and the output terminal of the power supply PCB board under test is connected to the load through the third relay. The third relay is used to control the connection or disconnection of the load.

[0047] In the above embodiment, the automatic control of the load connection during the loaded performance test of the power supply PCB board under test is realized. Among them, the third relay can accurately control the connection or disconnection state between the load and the output terminal of the power supply PCB board under test, thus avoiding the misoperation and time delay that may be caused by manual intervention, and improving the test efficiency and reliability. At the same time, the RS232 communication interface provides a stable and reliable communication channel for data interaction between the loaded test module and external load devices, ensuring the accuracy of test parameter setting and result feedback. This embodiment significantly improves the operation convenience and intelligent level of the power supply PCB board detection device.

[0048] The output terminal of the PCB board of the power supply to be tested is connected to the load through the third relay. The third relay serves as a controllable switching element. By controlling the on / off state of the relay, the connection or disconnection between the load and the output terminal of the PCB board of the power supply to be tested is achieved. When the third relay is turned on, a loop is formed between the output terminal of the PCB board of the power supply to be tested and the load, and the power supply supplies power to the load. At this time, the relevant performance parameters of the PCB board under load conditions, such as the second output voltage, can be tested. When the third relay is turned off, the connection between the load and the output terminal of the PCB board is cut off, and the power supply stops. Through the RS232 communication interface, the load test module can send control commands to the load, such as setting the working mode of the load, adjusting the size of the load, etc. At the same time, the load can also feedback relevant information to the load test module through this interface, such as the actual power consumption, current, working state, etc. This data interaction function enables the load test to more flexibly and accurately simulate different working scenarios to comprehensively detect the load performance of the PCB board of the power supply to be tested. This embodiment realizes the automatic on / off control of the load, improves the automation degree of the load test, reduces manual intervention, meets the requirements of rapid detection in large-scale production, and improves the detection efficiency. It can obtain information such as the working state and relevant parameters of the load in real time, providing richer data support for the processing module to judge the load performance of the PCB board of the power supply to be tested, helping to more accurately evaluate the quality and performance of the PCB board, and timely discovering potential problems.

[0049] In an alternative embodiment, the load test module is further configured to test the target output current of the PCB board of the power supply to be tested when a load is connected to the output port of the PCB board of the power supply to be tested. The load test result also includes the target output current.

[0050] In the above embodiment, during the detection process of the power supply PCB board, not only the output voltage under load conditions can be measured, but also the target output current can be further tested. This enables the detection device to more comprehensively evaluate the performance of the power supply PCB board under actual load conditions, ensuring its output stability and reliability. Specifically, after adding the test function of the target output current, problems such as overcurrent or undercurrent of the power supply PCB board when carrying a specific load can be effectively discovered, so as to more accurately judge whether the load capacity of the power supply PCB board meets the design requirements, and the power efficiency of the PCB board of the power supply to be tested can be evaluated. This enhanced detection mechanism significantly improves the accuracy and integrity of the detection, providing a strong guarantee for product quality.

[0051] After the load test module connects the output terminal of the power supply PCB under test to the load through the third relay, in this circuit loop at this time, the current will flow from the output terminal of the power supply PCB to the load. Optionally, corresponding current detection components (such as current sensors, etc.) can be set in the load test module. These components can sense the magnitude of the current in the circuit. By processing and converting the current signal detected by the current detection component (such as converting the analog current signal into a digital signal, etc.), the target output current of the power supply PCB under test when the load is connected can be obtained; alternatively, some electronic loads have RS232 interfaces, and the signals transmitted through this interface can feedback the current situation of the load. The load test module transmits this target output current together with information such as the previously detected second output voltage as the load test result to the processing module, so that the processing module can comprehensively judge the load performance of the power supply PCB under test. For example, the power supply efficiency of the power supply PCB under test can also be evaluated. This enables the processing module to comprehensively judge the load performance of the power supply PCB from two important aspects of voltage and current, improving the accuracy and reliability of the quality assessment of the PCB.

[0052] In an optional embodiment, the processing module determines whether the power supply PCB under test is abnormal in the following manner: when the impedance detection result indicates that the first impedance or the second impedance is less than the preset impedance threshold, it is determined that there is a short - circuit abnormality in the power supply PCB under test; when the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no - load performance of the power supply PCB under test; when the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the load performance of the power supply PCB under test.

[0053] In the above - mentioned embodiment, through the analysis of the impedance detection result, it is possible to accurately determine whether there is a short - circuit abnormality in the power supply PCB under test, effectively avoiding the problem of functional failure caused by short - circuit; by comparing the difference between the first output voltage and the preset voltage, the performance stability of the power supply PCB under test under no - load conditions can be accurately evaluated to ensure that it meets the design expectations; by comparing the difference between the second output voltage and the preset voltage, the performance of the power supply PCB under test under load is further verified to ensure its reliability in the actual use environment. Through this detection device, a full - range and high - precision quality detection of the power supply PCB under test is realized, which can automatically detect various performance states of the power supply PCB, significantly improving the detection efficiency and accuracy, and reducing the uncertainty brought by manual participation.

[0054] The processing module makes a judgment based on the first impedance (input terminal impedance) and the second impedance (output terminal impedance) provided by the impedance detection module. If the first impedance or the second impedance is less than the preset impedance threshold, it is determined that there is a short - circuit abnormality in the power supply PCB under test. For example, the preset impedance threshold is 10Ω. If the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no - load performance of the power supply PCB under test, indicating that the actual no - load output voltage deviates significantly from the ideal value. This deviation may be caused by reasons such as component damage, poor soldering, or circuit design defects on the PCB board. Based on this, the processing module determines that there is an abnormality in the no - load performance of the power supply PCB under test. If the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the load - carrying performance of the power supply PCB under test. This indicates that under the load - carrying state, the output voltage of the PCB board does not match the expected value, which may be caused by reasons such as a mismatch between the load and the PCB board or a fault in the PCB board during load - carrying. The processing module determines that there is an abnormality in the load - carrying performance of the power supply PCB under test based on this comparison result. For example, the first preset voltage is 5V (or 3.3V, or other values), and the first error threshold is 0.5V (or 0.3V, or other values). In this embodiment, by setting the impedance threshold and the voltage error threshold, and based on clear judgment rules, the processing module can accurately determine whether there is a short - circuit abnormality in the power supply PCB under test and whether there are abnormalities in the no - load and load - carrying performances. This helps to promptly discover quality problems of the PCB board, improve the reliability and stability of the product, reduce the possibility of unqualified products flowing into the market, and can improve the detection accuracy. In practical applications, the efficiency of the power supply under test can also be evaluated according to the output power and input power of the power supply PCB under test.

[0055] In an alternative embodiment, the load - carrying test module includes: a communication interface for communicating with an electronic load; a third relay for connecting the output terminal of the power supply PCB under test to the load; and a current acquisition circuit for acquiring the currents at the input terminal and the output terminal of the power supply PCB under test.

[0056] The above - mentioned processing module is also used to control the working sequence of each module. In practical applications, the above - mentioned processing module can be a microprocessor, which collects data from the impedance detection module, the power - on test module, and the load - carrying test module, and determines whether the power supply PCB under test is normal according to the preset thresholds.

[0057] The above - mentioned impedance detection module further includes: a short - circuit protection mechanism that automatically cuts off the power supply when a short - circuit is detected.

[0058] This application also provides a detection method for a power supply PCB board, which is applied to the detection device for a power supply PCB board in any of the foregoing embodiments. Figure 2It is a flowchart of a detection method for a power supply PCB board provided by an embodiment of the present application. The process includes: Step S201: Use an impedance detection module to respectively detect the first impedance at the input end and the second impedance at the output end of the power supply PCB board to be tested, obtain the impedance detection result, and transmit the impedance detection result to the processing module. Among them, the impedance detection result includes the first impedance and the second impedance; Step S202: The processing module determines whether there is a short - circuit abnormality in the power supply PCB board to be tested according to the impedance detection result. And when it is determined that there is no short - circuit abnormality in the power supply PCB board to be tested, use a power - on test module to collect the power - on test result of the power supply PCB board to be tested under no - load conditions, and transmit the power - on test result to the processing module. Among them, the power - on test result includes the first output voltage; Step S203: The processing module determines whether the no - load performance of the power supply PCB board to be tested is abnormal according to the power - on test result. And when it is determined that the no - load performance of the power supply PCB board to be tested is normal, connect a load to the output port of the power supply PCB board to be tested through a loaded test module, test the loaded test result of the power supply PCB board to be tested, and transmit the loaded test result to the processing module. Among them, the loaded test result includes the second output voltage; Step S204: The processing module determines whether the loaded performance of the power supply PCB board to be tested is abnormal according to the loaded test result.

[0059] Through the above steps, the impedance detection module can accurately measure the impedances at the input end and the output end of the power supply PCB board to be tested and transmit them to the processing module, thus effectively judging whether there is a short - circuit abnormality and avoiding the problem of easy omission in traditional manual visual inspection; the power - on test module can accurately evaluate whether the no - load performance of the power supply PCB board is normal by collecting and transmitting the output voltage under no - load conditions to the processing module, ensuring that its basic electrical characteristics meet the design requirements; the loaded test module introduces an actual load environment to further verify the loaded capacity of the power supply PCB board under real working conditions, and combines with the processing module to complete a comprehensive determination, ensuring product reliability; the entire process can automatically complete the detection of multiple key indicators without manual intervention, greatly reducing the investment in human resources, while improving the consistency and repeatability of detection, and is especially suitable for large - scale industrial production requirements.

[0060] Through the standardized detection process and precise condition judgment in this embodiment, unnecessary detection steps can be avoided, ensuring that various performance detections are carried out under appropriate conditions. This can more accurately determine whether the performance of the PCB board is normal, reduce the situations of misjudgment and missed judgment, and improve the accuracy of the detection results. The automated detection device performs detections according to the preset process, without the need for manual complex decision-making and operations, greatly improving the detection efficiency. In large-scale production, a large number of PCB boards can be quickly detected, defective products can be screened out in a timely manner, production efficiency can be improved, and production costs can be reduced. This detection method comprehensively detects and judges the impedance, no-load performance, and loaded performance of the PCB board, and can provide richer and more accurate information for the quality assessment of the PCB board. It helps the manufacturer to timely discover the problems existing in the products, make targeted improvements and optimizations, and enhance the overall quality and reliability of the products.

[0061] In an alternative embodiment, the above method further includes at least one of the following: when it is determined that the first impedance or the second impedance is less than the preset impedance threshold, it is determined that there is a short-circuit abnormality in the power supply PCB board to be tested; when it is determined that the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no-load performance of the power supply PCB board to be tested; when it is determined that the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the loaded performance of the power supply PCB board to be tested.

[0062] In the above embodiment, by comparing the first impedance and the second impedance with the preset impedance threshold, it can be quickly and accurately determined whether there is a short-circuit abnormality in the power supply PCB board, improving the sensitivity and reliability of the detection, and effectively avoiding functional failures caused by short-circuit problems; by determining the absolute value of the difference between the first output voltage and the first preset voltage, it can accurately identify whether there is an abnormality in the performance of the power supply PCB board under no-load conditions, thus ensuring that the basic power supply function of the circuit board meets the design requirements; by analyzing the absolute value of the difference between the second output voltage and the first preset voltage, the stability of the power supply PCB board under loaded conditions can be further verified, ensuring its reliable operation in the actual application scenario and reducing potential quality risks.

[0063] If the first impedance (input terminal impedance) or the second impedance (output terminal impedance) is less than the preset impedance threshold, it is determined that there is a short-circuit abnormality in the power supply PCB board to be tested; if the absolute value of the difference between the first output voltage (no-load voltage) and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no-load performance of the power supply PCB board to be tested; if the absolute value of the difference between the second output voltage (loaded voltage) and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the loaded performance of the power supply PCB board to be tested.

[0064] The detection process of the power supply PCB board in the embodiments of this application is generally as follows: Perform impedance detection, collect the impedances of the input and output ends of the power supply PCB board to be tested, and determine whether the power supply PCB board to be tested is short-circuited; If the impedance detection passes, then perform a power-on test, collect the input voltage and output voltage of the power supply PCB board to be tested, and determine whether the output voltage is normal; If the power-on test passes, then perform a load test, control the relay to connect the load, and monitor the input voltage, input current, output voltage, and output current of the power supply PCB board to be tested, and determine whether the load-carrying performance and efficiency of the power supply PCB board to be tested are normal.

[0065] It should be noted that the above-described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. The following will specifically describe this application in combination with specific embodiments.

[0066] The embodiments of this application provide a detection system and method for detecting a PCB board, Figure 3 which is a schematic diagram of a PCB board detection system provided by the embodiments of this application. The specific detection method is as follows: First, perform impedance detection and collect the impedances of the input and output ports of the PCB board to be tested (corresponding to the aforementioned power supply PCB board to be tested, or simply referred to as the power board); after the impedance detection passes, then collect its output voltage, that is, perform an unloaded voltage test; after detecting that the voltage is normal, control the relay (corresponding to the aforementioned third relay) to connect the load and monitor its output voltage and current, that is, perform a load-carrying performance test; if both the collected voltage and current are within the error range, then determine that the PCBA function is normal.

[0067] As Figure 3 shown, the impedance detection part is used to perform impedance detection on the PCB board to be tested, the power supply part is used to provide power to the PCB board to be tested during the power-on test, and detect the output voltage of the PCB board to be tested (corresponding to the aforementioned first output voltage) through the voltage acquisition part. In practical applications, there is a relay (corresponding to the aforementioned target relay, Figure 3 not shown in the figure) between the PCB board to be tested and the power supply part; after the power-on test passes, then perform a load test. In practical applications, there is a relay (corresponding to the aforementioned third relay, Figure 3 not shown in the figure) between the PCB board to be tested and the load (such as Figure 3 the electronic load in the figure), which is used to control the connection of the load. After the load is connected, sample the output voltage of the PCB board to be tested, and obtain the current information fed back by the electronic load through the RS232 interface signal.

[0068] Figure 4It is a schematic diagram of an impedance detection circuit provided by an embodiment of the present application, which detects the impedance of the input and output terminals of a detection power supply, and determines whether the circuit is short-circuited by the impedance magnitude. Figure 4 The microprocessor is equivalent to the aforementioned processing module. Measurement principle: The test voltage V1 is the weak voltage output by the voltage follower. It forms a loop through the circuit under test, the relay, the reference resistor (such as R0), and then to the ground. The differential amplifier circuit will collect the voltage across R0 to obtain the voltage V2. According to circuit analysis, the resistance calculation formula for the circuit under test is: Rs = (n * V1 – V2) * R0 / V2, where n is the amplification factor of the differential amplifier circuit.

[0069] Power-on test: Power the board (corresponding to the aforementioned PCB under test) through the relay (corresponding to the aforementioned target relay), and collect the output voltage to determine whether the output voltage is normal. If the voltage is abnormal, the abnormal voltage value will be displayed through the PC software.

[0070] First, perform voltage division and filtering on the input voltage, as Figure 5 shown, and then isolate and obtain the voltage magnitude through the voltage follower, as Figure 6 shown. Refer to the description of the circuit principle in the aforementioned embodiment, and details will not be repeated here.

[0071] Load test: After power-on, use RS232 to communicate with the electronic load and connect the power output terminal to the load through the relay to test whether the power load performance and efficiency are normal. Efficiency calculation formula: Efficiency = (input voltage * input current) / (output voltage * output current).

[0072] Figure 7 It is a schematic diagram of a load test circuit provided by an embodiment of the present application. The power supply under test corresponds to the aforementioned PCB under test. The output voltage of the PCB under test and the current of the electronic load are collected and transmitted to the microprocessor (corresponding to the aforementioned processing module), and the microprocessor analyzes the load performance of the PCB under test.

[0073] Figure 8 It is a schematic diagram of the process for detecting a PCB provided by an embodiment of the present application. The process includes: S801, Install the board and the worker wires the circuit, that is, wire the PCB under test, the detection device, and the load as required; S802, Perform impedance detection and determine whether the impedance matches, that is, determine whether the impedance meets the requirements; S803, When the judgment result in step S802 is yes, perform a power-on test; S804, Determine whether the output voltage (corresponding to the aforementioned first output voltage) meets the requirements, that is, perform no-load performance judgment; S805. When the judgment result in S804 is yes, perform a load test. S806. Judge whether the voltage and efficiency meet the requirements, that is, perform a load performance judgment. S807. When the judgment result in S806 is yes, disconnect the power supply and then end. If the judgment result of the above step S802 or S804 or S806 is no, directly end.

[0074] The embodiments of the present application have at least the following effects: it can automatically check the impedance, power-on, and load conditions of the PCB board, quickly detect whether the PCBA welding is normal, collect its output voltage to judge whether the board is normal, avoid consuming a lot of manpower, and save a large amount of manpower.

[0075] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present application.

[0076] The present application also provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed, the method steps described in any one of the above are executed.

[0077] In an exemplary embodiment, the above computer-readable storage medium may include, but is not limited to: USB flash drive, read-only memory (abbreviated as ROM), random access memory (abbreviated as RAM), mobile hard disk, magnetic disk, or optical disk and other various media that can store computer programs.

[0078] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] The above are only the exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited by this. That is, all equivalent changes and modifications made according to the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will easily think of other implementation schemes of the present disclosure after considering the disclosure of the specification.

[0080] This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include well-known knowledge or conventional technical means in the technical field not recorded in the present disclosure.

Claims

1. A detection device for a power supply PCB board, characterized in that, Including: An impedance detection module, configured to detect a first impedance at the input end and a second impedance at the output end of the power supply PCB to be tested, and transmit the impedance detection result to the processing module, where the impedance detection result includes the first impedance and the second impedance; A power-on test module, configured to supply power to the power supply PCB to be tested through a target relay, collect a first output voltage of the power supply PCB to be tested under no-load conditions, and transmit the power-on test result to the processing module, where the power-on test result includes the first output voltage; A loaded test module, configured to connect the output end of the power supply PCB to be tested to a load, test a second output voltage of the power supply PCB to be tested, and transmit the loaded test result to the processing module, where the loaded test result includes the second output voltage; The processing module is electrically connected to the impedance detection module, the power-on test module, and the loaded test module respectively, and the processing module is configured to perform the following operations: Judge whether there is a short-circuit abnormality in the power supply PCB to be tested according to the impedance detection result; Judge whether the no-load performance of the power supply PCB to be tested is abnormal according to the power-on test result; Judge whether the loaded performance of the power supply PCB to be tested is abnormal according to the loaded test result.

2. The detection device for the power supply PCB board according to claim 1, characterized in that, The impedance detection module includes: a first voltage follower, a second voltage follower, a first relay, a second relay, a first reference resistor, a second reference resistor, a first differential amplifier, and a second differential amplifier, where The output end of the first voltage follower is electrically connected to the positive electrode of the input end of the power supply PCB to be tested, the negative electrode of the input end of the power supply PCB to be tested is sequentially connected to the ground terminal through the first relay and the first reference resistor, the first reference resistor is connected in series with the first relay, and the first differential amplifier is configured to collect a first reference voltage across the first reference resistor, where the first voltage follower is configured to output a first test voltage; The output end of the second voltage follower is electrically connected to the positive electrode of the output end of the power supply PCB to be tested, the negative electrode of the output end of the power supply PCB to be tested is sequentially connected to the ground terminal through the second relay and the second reference resistor, the second reference resistor is connected in series with the second relay, and the second differential amplifier is configured to collect a second reference voltage across the second reference resistor, where the second voltage follower is configured to output a second test voltage; The impedance detection module is configured to obtain the first impedance according to the first test voltage, the first reference voltage, the resistance value of the first reference resistor, and the amplification factor of the first differential amplifier, and obtain the second impedance according to the second test voltage, the second reference voltage, the resistance value of the second reference resistor, and the amplification factor of the second differential amplifier.

3. The detection device for the power supply PCB board according to claim 1, wherein, The power-on test module includes a first voltage dividing circuit and a first filtering circuit, where The first input terminal of the first voltage dividing circuit is electrically connected to the positive electrode of the output terminal of the power supply PCB to be measured, and the second input terminal of the first voltage dividing circuit and the negative electrode of the output terminal of the power supply PCB to be measured are both electrically connected to the ground terminal. The voltage dividing output terminal of the first voltage dividing circuit is electrically connected to the first AD port of the processing module through the first filtering circuit; Among them, the processing module obtains the first output voltage through the first AD port.

4. The detection device for the power supply PCB according to claim 3, wherein: The first voltage dividing circuit includes a first resistor and a second resistor, and the first filtering circuit includes a third resistor and a first capacitor; wherein, the first end of the first resistor is electrically connected to the positive electrode of the output port of the power supply PCB to be measured, and the second end of the first resistor is electrically connected to the ground terminal through the second resistor; the second end of the first resistor is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the first AD port, and the first capacitor is connected between the second end of the third resistor and the ground terminal.

5. The detection device for the power supply PCB board according to claim 3, characterized in that, The power-on test module further includes a first isolation circuit, and the first filtering circuit is electrically connected to the first AD port through the first isolation circuit, wherein, The first isolation circuit includes a first operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a fourth capacitor and a first transient suppression diode. The output terminal of the first filtering circuit is sequentially electrically connected to the non-inverting input terminal of the first operational amplifier through the fourth resistor and the fifth resistor. The fourth resistor and the fifth resistor are connected in series, and the second capacitor is connected between the connection point between the fourth resistor and the fifth resistor and the output terminal of the first operational amplifier. The inverting input terminal of the first operational amplifier is electrically connected to the output terminal of the first operational amplifier. The third capacitor is connected between the non-inverting input terminal of the first operational amplifier and the ground terminal. The output terminal of the first operational amplifier is electrically connected to the first end of the sixth resistor, the second end of the sixth resistor is electrically connected to the first AD port, the fourth capacitor is connected between the second end of the sixth resistor and the ground terminal, and the first transient suppression diode is connected between the second end of the sixth resistor and the ground terminal.

6. The detection device for the power supply PCB board according to claim 1, characterized in that The load test module includes a third relay and an RS232 communication interface. The load test module is connected to the load through the RS232 communication interface. The output terminal of the power supply PCB to be measured is connected to the load through the third relay. The third relay is used to control the connection or disconnection of the load.

7. The detection device for the power supply PCB board according to claim 1, characterized in that, The load test module is further configured to test the target output current of the power supply PCB to be measured when the load is connected to the output port of the power supply PCB to be measured, and the target output current is also included in the load test result.

8. The detection device for the power supply PCB board according to claim 1, wherein, The processing module determines whether the power supply PCB to be measured is abnormal in the following manner: When the impedance detection result indicates that the first impedance or the second impedance is less than a preset impedance threshold, it is determined that there is a short - circuit abnormality in the power - supply PCB under test; When the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no - load performance of the power - supply PCB under test; When the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the load - carrying performance of the power - supply PCB under test.

9. A detection method for a power supply PCB board, characterized in that, Applied to the detection device for the power - supply PCB according to any one of claims 1 to 8, it includes: The impedance detection module is used to respectively detect the first impedance at the input end and the second impedance at the output end of the power - supply PCB under test, obtain the impedance detection result, and transmit the impedance detection result to the processing module, where the impedance detection result includes the first impedance and the second impedance; The processing module determines whether there is a short - circuit abnormality in the power - supply PCB under test according to the impedance detection result. When it is determined that there is no short - circuit abnormality in the power - supply PCB under test, the power - on test module is used to collect the power - on test result of the power - supply PCB under test in the no - load condition, and transmit the power - on test result to the processing module, where the power - on test result includes the first output voltage; The processing module determines whether the no - load performance of the power - supply PCB under test is abnormal according to the power - on test result. When it is determined that the no - load performance of the power - supply PCB under test is normal, the load is connected to the output port of the power - supply PCB under test through the load - carrying test module, and the load - carrying test result of the power - supply PCB under test is tested, and the load - carrying test result is transmitted to the processing module, where the load - carrying test result includes the second output voltage; The processing module determines whether the load - carrying performance of the power - supply PCB under test is abnormal according to the load - carrying test result.

10. The detection method of the power supply PCB board according to claim 9, characterized in that, The method further includes at least one of the following: When it is determined that the first impedance or the second impedance is less than the preset impedance threshold, it is determined that there is a short - circuit abnormality in the power - supply PCB under test; When it is determined that the absolute value of the difference between the first output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the no - load performance of the power - supply PCB under test; When it is determined that the absolute value of the difference between the second output voltage and the first preset voltage is greater than the first error threshold, it is determined that there is an abnormality in the load - carrying performance of the power - supply PCB under test.

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