Power line surge coupling and decoupling network test system

Abstract

The utility model discloses a power line surge coupling and decoupling network test system, comprising a combination wave generator, a coupling network unit and a tested device which are electrically connected in sequence. The coupling network unit comprises a decoupling network unit and a first capacitor, and the decoupling network unit and the first capacitor are connected in series between the combined wave generator and the tested device. The first capacitor is used for carrying out capacitive coupling to transmit circuit signals. And the decoupling network is used for isolating the tested equipment. A coupling mode of capacitive coupling is used in the coupling network, and lightning stroke surge signals generated by the combined wave generator are injected to a power line of a tested device, so that the anti-interference capability of a product is verified. And meanwhile, the decoupling network part is realized by an inductor group, and an inductor with a balanced parameter is used, so that the normal work of the tested equipment is not influenced, the situation that the decoupling effect cannot be achieved due to too small inductance value is avoided, and the test system is prevented from being easily damaged by impact current.

Description

Technical Field

[0001] This utility model relates to the field of anti-interference testing technology, specifically to a power line surge coupling decoupling network testing system. Background Technology

[0002] The rapid development of urban rail transit, with its increasingly dense network of lines and higher speeds, has significantly increased the stability requirements for the electrical equipment inside trains. However, lightning overvoltages and operational overvoltages causing train communication system crashes and restarts severely impact train stability, necessitating a corresponding lightning protection testing system. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a power line surge coupling decoupling network testing system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts a power line surge coupling and decoupling network testing system, comprising a combined wave generator, a coupling network unit, and the device under test, wherein:

[0005] The combined wave generator, the coupling network unit, and the device under test (DUT) are electrically connected in sequence, and are used to transmit the lightning surge signal generated by the combined wave generator to the DUT through the coupling network unit. The coupling network unit includes a decoupling network unit and a first capacitor, which are connected in series between the combined wave generator and the DUT. The first capacitor is used for capacitive coupling to transmit circuit signals. The decoupling network is used to isolate the DUT.

[0006] Preferably, the capacitance of the first capacitor is 0.5μF.

[0007] Preferably, the decoupling network unit includes an inductor group and a first resistor. The inductor group is connected in series between the combined wave generator and the first capacitor, and the first resistor is connected in series between the combined wave generator and the inductor group, for providing decoupling impedance for lightning surge signals.

[0008] Furthermore, the power line surge coupling decoupling network test system also includes an auxiliary test unit, which is connected in parallel between the first resistor and the inductor group, and includes auxiliary equipment and the first inductor.

[0009] Preferably, the auxiliary device is a laptop computer auxiliary device used for testing router products or a switch auxiliary device used for testing multi-functional devices.

[0010] Preferably, the wiring cables in this system are twisted-pair cables.

[0011] Preferably, the power supply line is either a two-phase line or a three-phase line.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model provides a power line surge coupling and decoupling network testing system, comprising a coupling network unit and a decoupling network unit. It injects a lightning surge signal generated by a combined wave generator into the power line of the device under test (DUT) via capacitive coupling, thereby verifying the product's anti-interference capability. Simultaneously, the decoupling network is implemented using an inductor array with balanced parameters. This ensures that the system does not interfere with the normal operation of the DUT, nor is it insufficient for decoupling due to inductance, thus preventing the testing system from being easily damaged by surge currents. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system structure of an embodiment of a power line surge coupling decoupling network testing system according to the present invention;

[0015] In the picture:

[0016] 1. Device under test; 2. Combined wave generator; 3. First resistor; 40. Inductor group; 5. Coupled network unit; 6. First capacitor; 70. Auxiliary equipment; 71. First inductor. Detailed Implementation

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0018] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0019] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] refer to Figure 1 , Figure 1 This diagram illustrates the system structure of a power line surge coupling decoupling network testing system provided in an embodiment of the present invention.

[0023] like Figure 1 As shown, the technical solution provided in this application is a power line surge coupling and decoupling network test system, including a combined wave generator 2, a coupling network unit 5, and a device under test 1, wherein:

[0024] The combined wave generator 2, coupling network unit 5, and device under test 1 are electrically connected in sequence. The coupling network unit 5 transmits the lightning surge signal generated by the combined wave generator 2 to the device under test 1. The coupling network unit 5 includes a decoupling network unit and a first capacitor 6, which are connected in series between the combined wave generator 2 and the device under test 1. The first capacitor 6 is used for capacitive coupling to transmit circuit signals. The decoupling network is used to isolate the device under test 1. The capacitance of the first capacitor 6 is 0.5 μF.

[0025] The power line surge coupling / decoupling network test system provided in this application includes a coupling network unit 5 and a decoupling network unit. The coupling network uses a 0.5μF capacitor coupling method, with coupling waveforms covering 1.2 / 50μs and 10 / 700μs. The surge signal generated by the combined wave generator 2 is injected into the power line of the device under test 1 to verify the product's anti-interference capability. Simultaneously, the decoupling network is implemented by an inductor group 40, using a balanced inductor. This ensures that it does not affect the normal operation of the device under test 1, nor is it insufficient for decoupling due to inductance too small, thus preventing the test system from being easily damaged by surge current.

[0026] Furthermore, capacitive coupling offers a faster response speed compared to gas discharge tube coupling, and its breakdown voltage consistency is better, while that of gas discharge tubes is less consistent and more dispersed. Therefore, capacitive coupling performs more stably and reliably under different conditions. Before breakdown, a gas discharge tube is essentially an open circuit with little or no leakage current, and capacitive coupling also has the advantage of very little or no leakage current, which is crucial for maintaining circuit stability and efficiency. In addition, gas discharge tubes suffer from freewheeling current issues; after an overvoltage event, the tube remains conductive until the current drops below the freewheeling current level. Capacitive coupling, however, does not have this problem and can more cleanly cut off the current.

[0027] In some embodiments, reference Figure 1 The decoupling network unit includes an inductor group 40 and a first resistor 3. The inductor group 40 is connected in series between the combined wave generator 2 and the first capacitor 6, and the first resistor 3 is connected in series between the combined wave generator 2 and the inductor group 40, which are used to provide decoupling impedance for lightning surge signals.

[0028] In some embodiments, reference Figure 1 The power line surge coupling decoupling network test system also includes an auxiliary test unit, which is connected in parallel between the first resistor 3 and the inductor group 40, including auxiliary equipment 70 and the first inductor 71.

[0029] For example, the auxiliary device 70 is a device used in conjunction with the device under test 1 during testing to achieve the function of the device under test 1, ensuring the accuracy of the test results and achieving better testing capabilities.

[0030] In some embodiments, the auxiliary device 70 is a laptop computer auxiliary device 70 used for testing router products or a switch auxiliary device 70 used for testing multi-functional devices.

[0031] For example, in this embodiment, the laptop auxiliary device 70 used for testing the router product is model HP-487D6PA; the switch auxiliary device 70 used for testing the multi-function device is model TP-Link-TL-SG2226.

[0032] In some embodiments, the wiring cables in this system are twisted-pair cables.

[0033] For example, the twisted-pair design helps reduce electromagnetic interference and radio frequency interference. The twisted wires can cancel out the influence of external magnetic fields on the signal, while also reducing crosstalk between the wire pairs. Furthermore, twisted-pair cables are less expensive to produce than other types of cables (such as coaxial cables or fiber optic cables), making them an affordable option in many applications.

[0034] In some embodiments, the power supply line is either a two-phase line or a three-phase line.

[0035] For example, this system can be used to handle two different power cord configurations.

[0036] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A power line surge coupling decoupling network testing system, characterized in that, It includes a combined wave generator, a coupling network unit, and the device under test, wherein: The combined wave generator, the coupling network unit, and the device under test are electrically connected in sequence, and are used to transmit the lightning surge signal generated by the combined wave generator to the device under test through the coupling network unit. The coupling network unit includes a decoupling network unit and a first capacitor, which are connected in series between the combined wave generator and the device under test. The first capacitor is used for capacitive coupling to transmit circuit signals. The decoupling network is used to isolate the device under test.

2. The power line surge coupling decoupling network test system according to claim 1, characterized in that, The capacitance of the first capacitor is 0.5μF.

3. The power line surge coupling decoupling network test system according to claim 1, characterized in that, The decoupling network unit includes an inductor group and a first resistor. The inductor group is connected in series between the combined wave generator and the first capacitor, and the first resistor is connected in series between the combined wave generator and the inductor group, for providing decoupling impedance for lightning surge signals.

4. The power line surge coupling decoupling network test system according to claim 3, characterized in that, It also includes an auxiliary testing unit, which is connected in parallel between the first resistor and the inductor group, and includes auxiliary equipment and the first inductor.

5. The power line surge coupling decoupling network test system according to claim 4, characterized in that, The auxiliary equipment is either a laptop computer used for testing router products or a switch used for testing multi-functional devices.

6. The power line surge coupling decoupling network test system according to claim 1, characterized in that, The wiring cables in this system are twisted-pair cables.

7. The power line surge coupling decoupling network test system according to claim 1, characterized in that, The power supply line is either a two-phase line or a three-phase line.

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