Circuit board module inspection device

Abstract

The utility model discloses a kind of circuit board module detection devices, it is related to circuit board detection technical field, including control module, power module, variable test load, total switch module, circuit protection module and output switch module;Power module is electrically connected with control module;Variable test load is constituted by load module and resistance adjustable voltage divider module in parallel;Total switch module is connected in series between variable test load and the output end of measured circuit, and is electrically connected with control module;Circuit protection module includes zero-sequence current transformer and electronic switch module, and zero-sequence current transformer output end is electrically connected with electronic switch module input end;Output switch module is connected in series between measured circuit output end and external load.The utility model adopts the dual protection mechanism of hardware direct connection protection and software monitoring protection combination, can quickly respond to leakage and other emergency, flexibly handle various electrical abnormalities, safety and reliability are superior to conventional single protection mode.

Description

Technical Field

[0001] This utility model belongs to the field of circuit board testing technology, and specifically relates to a circuit board module testing device. Background Technology

[0002] Circuit board testing commonly employs circuit breakers and residual current devices (RCDs). However, with increasingly stringent requirements for power quality and safety in modern electronic equipment, existing technologies mostly only enable simple tests of static parameters such as circuit board continuity and insulation, or provide only a fixed threshold residual current protection function. They generally lack the ability to comprehensively evaluate the dynamic performance of circuit boards under simulated real load environments. They cannot effectively test and verify core dynamic indicators such as voltage stability characteristics, transient response speed, and overload withstand capacity of circuit boards under load changes. The response speed of many traditional devices is limited by their internal mechanical structures or simple analog circuits, which may lead to untimely protection or misjudgment when facing instantaneous leakage or overvoltage faults. When a fault occurs, these devices typically only perform simple tripping actions, unable to record detailed parameters at the time of the fault, and lack communication interfaces for data exchange with host computer systems, resulting in the inability to perform remote monitoring and in-depth fault tracing analysis. Utility Model Content

[0003] In view of the deficiencies in the prior art, this utility model provides a circuit board module testing device to solve the above-mentioned technical problems.

[0004] A circuit board module testing device includes the following components:

[0005] Control module;

[0006] The power supply module is electrically connected to the control module and is used to provide operating power to the control module;

[0007] A variable test load consisting of a load module and an adjustable voltage divider module connected in parallel;

[0008] The main switch module is connected in series between the variable test load and the output terminal of the circuit under test, and is electrically connected to the control module.

[0009] The circuit protection module includes a zero-sequence current transformer and an electronic switch module, wherein the output terminal of the zero-sequence current transformer is electrically connected to the input terminal of the electronic switch module.

[0010] An output switch module is connected in series between the output terminal of the circuit under test and the external load. The output switch module is electrically connected to the output terminal of the control module and the output terminal of the circuit protection module.

[0011] Preferably, the circuit protection module further includes a voltage sampling circuit, the sampling terminal of which is electrically connected to the input terminal of the output switch module, and the output terminal of which is electrically connected to the signal input terminal of the control module.

[0012] Preferably, the voltage sampling circuit includes resistor R1, resistor R2, and a voltage follower;

[0013] The input terminal of the output switch module is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, the common connection point of the resistors R1 and R2 is connected to the input terminal of the voltage follower, and the output terminal of the voltage follower is electrically connected to the input terminal of the control module.

[0014] Preferably, the power supply module includes an AC power input module and an AC-DC conversion circuit;

[0015] One output terminal of the AC power input module is connected to the input terminal of the AC-CDC conversion circuit, and the output terminal of the AC-CDC conversion circuit is connected to the circuit protection module.

[0016] Preferably, the electronic switch module includes a leakage protection chip, a thyristor, a rectifier, and an execution circuit;

[0017] The output terminal of the leakage protection chip is connected to the control electrode of the thyristor; the anode-cathode path of the thyristor is connected in series with the execution circuit and then connected to the DC output terminal of the rectifier; the output terminal of the execution circuit is electrically connected to the control terminal of the output switch module.

[0018] Preferably, the load module is a purely resistive load.

[0019] Preferably, the voltage divider module includes a digital potentiometer, and the control module is connected to the digital potentiometer via a digital bus.

[0020] Preferably, the voltage divider module includes multiple parallel resistor branches and micro switches connected in series with each branch, and the multiple control output terminals of the control module are connected one-to-one with the control terminals of the multiple micro switches.

[0021] Preferably, the control module includes a microprocessor and a memory connected to the microprocessor.

[0022] Preferably, the system also includes a communication interface, one side of which is connected to the control module and the other side of which is connected to the host computer system.

[0023] The beneficial effects of this invention are as follows: By linking the variable test load and the control module, the detection capability is elevated from static on / off judgment to dynamic performance analysis, greatly enhancing the depth and breadth of detection. Secondly, its dual protection mechanism, combining direct hardware protection and software monitoring protection, not only ensures rapid response in emergencies such as leakage current, but also provides flexible handling capabilities for various electrical anomalies, resulting in safety and reliability far exceeding traditional single protection modes. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of a circuit board module testing device provided by this utility model;

[0026] Figure 2 This is a schematic diagram of the voltage sampling circuit of a circuit board module detection device provided by this utility model. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0029] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 As shown, a circuit board module testing device includes the following components:

[0031] Control module;

[0032] The power supply module is electrically connected to the control module and is used to provide operating power to the control module;

[0033] A variable test load consisting of a load module and an adjustable voltage divider module connected in parallel;

[0034] The main switch module is connected in series between the variable test load and the output terminal of the circuit under test, and is electrically connected to the control module.

[0035] The circuit protection module includes a zero-sequence current transformer and an electronic switch module, wherein the output terminal of the zero-sequence current transformer is electrically connected to the input terminal of the electronic switch module.

[0036] An output switch module is connected in series between the output terminal of the circuit under test and the external load. The output switch module is electrically connected to the output terminal of the control module and the output terminal of the circuit protection module.

[0037] When evaluating the dynamic performance of the circuit under test, the control module first issues a command to close the main switch module, thereby connecting the output of the circuit under test to a variable test load consisting of a load module and a voltage divider module connected in parallel. Subsequently, by adjusting the resistance of the voltage divider module, the total load of the test circuit is dynamically changed to simulate various real-world operating conditions from light to heavy loads. During this process, the real-time response data of the circuit under test is transmitted back to the control module for analysis, thereby testing its voltage stability and overload capacity under different loads. Regarding the implementation of the protection mechanism, this solution constructs a dual hardware and software guarantee: on the one hand, when the zero-sequence current transformer detects a leakage fault, it bypasses the control module and directly transmits the signal to the electronic switch module, which triggers the output switch module to perform a hardware-level instantaneous trip; on the other hand, the control module itself continuously monitors the circuit status, and once it detects overvoltage, overcurrent, or other abnormalities, it can also actively send a command to disconnect the output switch module, providing software-level protection.

[0038] This solution, through the linkage of variable test load and control module, elevates the detection capability from static on / off judgment to dynamic performance analysis, greatly enhancing the depth and breadth of detection. Secondly, its dual protection mechanism, combining direct hardware protection and software monitoring protection, not only ensures rapid response in emergencies such as leakage current, but also provides flexible handling capabilities for various electrical anomalies, resulting in safety and reliability far exceeding traditional single protection modes.

[0039] More specifically, the circuit protection module further includes a voltage sampling circuit, the sampling terminal of which is electrically connected to the input terminal of the output switch module, and the output terminal of which is electrically connected to the signal input terminal of the control module.

[0040] like Figure 2 As shown, more specifically, the voltage sampling circuit includes resistors R1 and R2 and a voltage follower;

[0041] The input terminal of the output switch module is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, the common connection point of the resistors R1 and R2 is connected to the input terminal of the voltage follower, and the output terminal of the voltage follower is electrically connected to the input terminal of the control module.

[0042] When a high voltage is applied to the voltage divider circuit on the main line, a safe low-voltage signal proportional to the main line voltage is generated at the common connection point of R1 and R2, according to the principle of resistor voltage division. A voltage follower is then used to send this low-voltage signal to the input of the control module. The voltage follower reads the voltage at the voltage division point with high input impedance, ensuring the accuracy of the voltage division ratio; simultaneously, it replicates and amplifies this voltage signal with low output impedance, generating a stable analog signal that is transmitted to the signal input of the control module, enabling the control module to read the real-time voltage value on the current main line. In addition to the hardware leakage protection provided by the zero-sequence current transformer, the control module can now monitor the sampled voltage value in real time. Once the voltage exceeds the preset range, it can immediately and actively cut off the output switch module via command, achieving overvoltage / undervoltage protection, which greatly expands the applicability of the protection function.

[0043] More specifically, the power supply module includes an AC power input module and an AC-DC conversion circuit;

[0044] One output terminal of the AC power input module is connected to the input terminal of the AC-CDC conversion circuit, and the output terminal of the AC-CDC conversion circuit is connected to the circuit protection module.

[0045] The external AC power supply is first connected to the AC power input module and then guided to the AC-DC conversion circuit. The AC-DC conversion circuit converts the unstable high-voltage AC power into stable low-voltage DC power, which is then supplied to the subsequent circuit protection module and the control module of the entire system.

[0046] More specifically, the electronic switch module includes a leakage protection chip, a thyristor, a rectifier, and an execution circuit;

[0047] The output terminal of the leakage protection chip is connected to the control electrode of the thyristor; the anode-cathode path of the thyristor is connected in series with the execution circuit and then connected to the DC output terminal of the rectifier; the output terminal of the execution circuit is electrically connected to the control terminal of the output switch module.

[0048] When a leakage current fault occurs, the zero-sequence current transformer at the front end immediately senses the fault signal and sends it to the leakage current protection chip. The internal circuitry of this dedicated chip compares this signal with a built-in reference. Once the fault is confirmed, its output pin outputs a trigger pulse. This pulse is applied as a command to the control electrode of the thyristor, causing it to conduct. Once the thyristor is turned on, an independent high-power DC circuit powered by the rectifier is connected. A strong DC current flows through the actuator circuit connected in series with the thyristor. This actuator circuit is typically an electromagnetic trip coil, which generates a strong electromagnetic force that acts on the output switch module, forcing it to trip and disconnect the main power supply.

[0049] More specifically, the load module is a purely resistive load.

[0050] Load modules are typically constructed using wire-wound resistors or thick-film resistor arrays, which minimize parasitic inductance and capacitance. Here, the nature of the load module is defined as a purely resistive load, used to provide a basic phase-shift-free static operating point for the circuit under test.

[0051] More specifically, the voltage divider module includes a digital potentiometer, and the control module is connected to the digital potentiometer via a digital bus.

[0052] When dynamic load testing is required, the control module sends digital commands to the digital potentiometer. Upon receiving these commands, the digital potentiometer's internal electronic switch array quickly and precisely changes the tap positions of its internal resistor network, thereby altering its overall equivalent resistance value. Because this voltage divider module and the load module are connected in parallel, each change in the digital potentiometer's resistance value instantly alters the total load applied to the circuit under test. By continuously sending different commands from the control module, the digital potentiometer can smoothly reproduce various complex dynamic load curves.

[0053] More specifically, the voltage divider module includes multiple parallel resistor branches and micro switches connected in series with each branch, and the multiple control output terminals of the control module are connected one-to-one with the control terminals of the multiple micro switches.

[0054] The control module's multiple output pins are hardwired one-to-one with the control terminals of these microswitches. When a specific load needs to be simulated, the control module outputs high / low level signals through the corresponding I / O pins to turn the corresponding microswitches on or off, thus forming a specific total load. By changing the output combinations of these I / O pins, the control module can drive this resistor array to simulate various programmed load change curves.

[0055] More specifically, the control module includes a microprocessor and a memory connected to the microprocessor.

[0056] More specifically, it also includes a communication interface, one side of which is connected to the control module and the other side of which is connected to the host computer system.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A circuit board module testing device, characterized in that, The system includes the following components: a control module; a power supply module electrically connected to the control module to provide operating power to the control module; a variable test load consisting of a load module and an adjustable voltage divider module connected in parallel; a main switch module connected in series between the variable test load and the output terminal of the circuit under test, and electrically connected to the control module; and a circuit protection module including a zero-sequence current transformer and an electronic switch module, wherein the output terminal of the zero-sequence current transformer is electrically connected to the input terminal of the electronic switch module. An output switch module is connected in series between the output terminal of the circuit under test and the external load. The output switch module is electrically connected to the output terminal of the control module and the output terminal of the circuit protection module.

2. The circuit board module testing device according to claim 1, characterized in that, The circuit protection module further includes a voltage sampling circuit, the sampling terminal of which is electrically connected to the input terminal of the output switch module, and the output terminal of which is electrically connected to the signal input terminal of the control module.

3. The circuit board module testing device according to claim 2, characterized in that, The voltage sampling circuit includes resistors R1 and R2 and a voltage follower; the input terminal of the output switch module is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2, the other end of resistor R2 is grounded, the common connection point of resistors R1 and R2 is connected to the input terminal of the voltage follower, and the output terminal of the voltage follower is electrically connected to the input terminal of the control module.

4. The circuit board module testing device according to claim 1, characterized in that, The power supply module includes an AC power input module and an AC-CDC conversion circuit; one output terminal of the AC power input module is connected to the input terminal of the AC-CDC conversion circuit, and the output terminal of the AC-CDC conversion circuit is connected to the circuit protection module.

5. The circuit board module testing device according to claim 1, characterized in that, The electronic switch module includes a leakage protection chip, a thyristor, a rectifier, and an execution circuit; the output terminal of the leakage protection chip is connected to the control electrode of the thyristor; the anode-cathode path of the thyristor is connected in series with the execution circuit and then connected to the DC output terminal of the rectifier; the output terminal of the execution circuit is electrically connected to the control terminal of the output switch module.

6. The circuit board module testing device according to claim 1, characterized in that, The load module is a purely resistive load.

7. The circuit board module testing device according to claim 1, characterized in that, The voltage divider module includes a digital potentiometer, and the control module is connected to the digital potentiometer via a digital bus.

8. The circuit board module testing device according to claim 1, characterized in that, The voltage divider module includes multiple parallel resistor branches and micro switches connected in series with each branch. The multiple control output terminals of the control module are connected one-to-one with the control terminals of the multiple micro switches.

9. The circuit board module testing device according to claim 1, characterized in that, The control module includes a microprocessor and a memory connected to the microprocessor.

10. The circuit board module testing device according to claim 1, characterized in that, It also includes a communication interface, one side of which is connected to the control module and the other side of which is connected to the host computer system.

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