Impedance module capable of adjusting conducted interference degree

Abstract

The invention discloses an impedance module with adjustable conducted interference degree, and relates to the technical field of electromagnetic compatibility testing, the module integrates an impedance matching unit I, an impedance matching unit II and a switching unit, and the compact and convenient design is realized. And the impedance matching unit I and the impedance matching unit II are respectively connected with an auxiliary equipment port and a tested equipment port of the coupling and decoupling network, and are used for switching an access state and a disconnection state or matching different impedance forms and values. The switching unit is designed to be a multi-position change-over switch, and switching of different test modes can be rapidly achieved. Compared with the prior art, the device has the advantages that the number and cost of components are reduced due to integrated design, the testing efficiency is improved, the influence of the disassembly and assembly process on precision is reduced, and user operation and use are facilitated; the overall design is compact and convenient, the accuracy and the application value of conduction immunity testing are remarkably improved, and wide application prospects are shown.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic compatibility testing, in particular to an adjustable impedance module for conducted interference. Background Art

[0002] In the conducted immunity test of electromagnetic compatibility (EMC), the coupling-decoupling network is a key component that connects the device under test and the test instrument. It simulates the electromagnetic interference signal in the actual working environment and is used to evaluate the performance of the device when it is subject to external electromagnetic interference.

[0003] Impedance matching, strict configuration and calibration are crucial in this test process. Impedance matching refers to a suitable match between the impedance of the signal source (such as the test signal generator) and the impedance of the load (such as the device under test) to achieve maximum power transfer and minimum reflection.

[0004] In the conducted immunity test, impedance matching can reduce signal loss and interference during transmission and improve the accuracy and reliability of the test.

[0005] However, the impedance module in the prior art needs to be assembled and disassembled externally, such as Figure 1 As shown, both the external matching impedance 1 and the external matching impedance 2 need to be external, connected with a connector, and need to be fixed with a bracket. This solution has the following shortcomings: first, there are many components, and the disassembly and assembly process is complicated and time-consuming; second, the test mode switching is not fast enough, affecting the test efficiency; third, frequent disassembly and assembly can easily lead to reduced accuracy and false connection problems, affecting the accuracy of the test results; fourth, additional components such as fixed brackets increase the cost. Summary of the invention

[0006] The purpose of the present invention is to provide an impedance module with adjustable conducted interference, aiming to solve the problems of numerous components of the existing impedance module, long test mode switching time, and complex disassembly and assembly resulting in impaired accuracy and high cost.

[0007] The present invention is implemented in this way, providing an adjustable impedance module for conducted interference, comprising an impedance matching unit 1, an impedance matching unit 2 and a switching unit, wherein the impedance matching unit 1 is connected to the switching unit and connected to the AE (auxiliary equipment) port of a coupling decoupling network, and is used to switch the connection and disconnection of the impedance matching unit 1 and the AE port, or to match different impedance forms or values, and the impedance matching unit 2 is connected to the switching unit and the EUT (equipment under test) port of the coupling decoupling network, and is used to switch the connection and disconnection of the impedance matching unit 2 and the EUT port, or to match different impedance forms or values.

[0008] Furthermore, the adjustable matching impedance module is integrated into the coupling-decoupling network as an independent module, the impedance matching unit 1 and the matching unit 2 are arranged inside the coupling-decoupling network, and the switching unit is arranged on the shell of the coupling-decoupling network, so as to facilitate direct operation or indirect operation.

[0009] Preferably, the first impedance matching unit is a 150Ω resistor.

[0010] Preferably, the second impedance matching unit is a 150Ω to 50Ω adapter.

[0011] Preferably, the switching unit is a multi-position switch, which realizes fast switching of different test modes by controlling different states of the switch.

[0012] Preferably, the switching unit is a PLC module, and the relay contacts of the PLC are driven by instructions from the touch screen to complete the switching of the impedance matching unit.

[0013] Preferably, the switching unit is an intelligent module, which can switch each impedance matching unit according to an input instruction, and is also provided with a feedback acquisition network to collect characteristic parameters of the unit under test or the calibration unit, and automatically complete impedance matching of the test and calibration.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The integrated design reduces the number of components, thereby lowering assembly complexity and cost.

[0015] (2) The switching unit enables fast switching between different test modes, thus improving test efficiency.

[0016] (3) The impact of the disassembly and assembly process on precision is reduced, thus improving the accuracy of the test.

[0017] (4) The overall design is more compact and convenient, making it easier for users to operate and use.

[0018] In summary, the adjustable matching impedance module of the present invention has significant advantages and application value in the conducted immunity test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the connection arrangement of the impedance module in the prior art; Figure 2 It is a schematic diagram of the overall layout of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0021] Example 1, see Figure 2 The present invention provides an adjustable impedance module for conducted interference, including an impedance matching unit 1, an impedance matching unit 2 and a switching unit, which is integrated into a coupling and decoupling network as an independent module, wherein the impedance matching unit 1 is connected to the switching unit and the AE (auxiliary equipment) port of the coupling and decoupling network, and is used to switch the connection and disconnection of the impedance matching unit 1 and the AE port, or to match different impedance forms or values. The impedance matching unit 2 is connected to the switching unit and the EUT (equipment under test) port of the coupling and decoupling network, and is used to switch the connection and disconnection of the impedance matching unit 2 and the EUT port, or to match different impedance forms or values. The impedance matching unit 1 and the matching unit 2 are arranged inside the coupling and decoupling network, and the switching unit is arranged on the housing of the coupling and decoupling network, which is convenient for direct or indirect operation.

[0022] In this embodiment, the first impedance matching unit is a 150Ω resistor, and the second impedance matching unit is a 150Ω to 50Ω adapter.

[0023] In this embodiment, the switching unit is a multi-position switch, which realizes fast switching of different test modes by controlling different states of the switch.

[0024] Embodiment 2 is based on Embodiment 1, and differs in that: the switching unit is a PLC module, and the relay contacts of the PLC are driven by the instructions of the touch screen, and each relay contact is connected to the impedance matching unit to be switched, so as to complete the switching of the impedance matching unit.

[0025] Embodiment 3 is based on Embodiment 1, and differs in that: the switching unit is an intelligent module, which can switch each impedance matching unit according to the input instruction, and also has a feedback acquisition network to collect the characteristic parameters of the measured unit or the calibration unit, and automatically complete the impedance matching of the test and calibration.

[0026] Working principle: Referring to Example 1, when working, the user can select the required impedance matching unit by operating the switching unit. For example, when the AE end needs to match 150Ω, the user can connect the matching unit 1 (150Ω resistor) to the circuit through the switching unit; when the EUT end needs to match 50Ω, the user can connect the matching unit 2 (150Ω to 50Ω adapter) to the circuit through the switching unit. Since the matching unit 1 and the matching unit 2 are both arranged inside the coupling and decoupling network, and the switching unit is arranged on the housing of the coupling and decoupling network, the user can conveniently directly or indirectly operate the switching unit to realize the rapid switching of different test modes.

Claims

1. An adjustable impedance module for conducted interference, comprising an impedance matching unit 1, an impedance matching unit 2 and a switching unit, wherein the impedance matching unit 1 is connected to the switching unit and the AE (auxiliary equipment) port of a coupling decoupling network, the impedance matching unit 2 is connected to the switching unit and the EUT (equipment under test) port of the coupling decoupling network, the adjustable matching impedance module is integrated into the coupling decoupling network as an independent module, the impedance matching unit 1 and the matching unit 2 are arranged inside the coupling decoupling network, and the switching unit is arranged on the housing of the coupling decoupling network.

2. The adjustable impedance module for conducted interference according to claim 1, characterized in that: The impedance matching unit 1 is a 150Ω resistor.

3. The adjustable impedance module for conducted interference according to claim 1, characterized in that: The impedance matching unit 2 is a 150Ω to 50Ω adapter.

4. A conduction interference adjustable impedance module according to any one of claims 1 to 3, characterized in that: The switching unit is a multi-position switch, which can realize fast switching of different test modes by controlling different states of the switch.

5. The adjustable impedance module for conducted interference according to any one of claims 1 to 3, characterized in that: The switching unit is a PLC module, which drives the relay contacts of the PLC through the instructions of the touch screen to complete the switching of the impedance matching unit.

6. The impedance adjustable module for conducted interference according to any one of claims 1 to 3, characterized in that: The switching unit is an intelligent module that can switch each impedance matching unit according to an input instruction and is provided with a feedback acquisition network to automatically complete impedance characteristic matching.

Images