Electromagnetic field and difference and common mode interference signal detection device

Abstract

The utility model relates to an electromagnetic field and differential and common mode interference signal detection device, which comprises a magnetic ring, a metal lead and a BNC (bayonet nut connector), one end of the BNC is connected with the outer surface of the magnetic ring, the other end of the BNC is connected with the input end of a signal amplifier, the output end of the signal amplifier is connected with the input end of a spectrum analyzer, the metal lead is wound on the magnetic ring, and the metal lead is wound on the spectrum analyzer. One end of the metal wire is connected with a core wire of the BNC connector, and the other end of the metal wire is connected with a shell of the BNC connector. The device is matched with a signal amplifier and a spectrum analyzer to quickly position the electromagnetic field leakage point and the electromagnetic field intensity of the equipment, the electromagnetic compatibility rectification efficiency is greatly improved, a visual and effective positioning measure is provided for the electromagnetic compatibility rectification of the equipment, an obvious indication is provided for the electromagnetic field disturbance leakage point and the electromagnetic field disturbance intensity of the equipment, and the reliability of the equipment is improved. And the electromagnetic compatibility rectification efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic compatibility especially relates to a kind of electromagnetic field and difference common mode interference signal detection device. BACKGROUND

[0002] The electromagnetic compatibility test of current equipment needs to be carried out in special third-party electromagnetic compatibility laboratory, needs to make an appointment in advance, test cost is expensive, test time is urgent and the like, which leads to the problem that electromagnetic compatibility cannot be well positioned on site, resulting in poor test effect. SUMMARY

[0003] The utility model provides a kind of electromagnetic field and difference common mode interference signal detection device, to solve the problem of high cost of existing test device, test effect is not good.

[0004] The utility model provides a kind of electromagnetic field and difference common mode interference signal detection device, including magnetic ring, metal wire and BNC connector, one end of the BNC connector is connected with the outer surface of the magnetic ring, the other end of the BNC connector is connected with the input end of signal amplifier, the output end of signal amplifier is connected with the input end of spectrum analyzer, the metal wire is wound on the magnetic ring, one end of the metal wire is connected with the core wire of the BNC connector, the other end of the metal wire is connected with the shell of the BNC connector.

[0005] As a further improvement of the utility model, the gap of the outer surface of the device to be measured is in contact with the magnetic ring.

[0006] As a further improvement of the utility model, the signal transmission line of the device to be measured is clamped in the inside of the magnetic ring.

[0007] As a further improvement of the utility model, the inner diameter of the magnetic ring is at least 20mm.

[0008] As a further improvement of the utility model, the impedance of the BNC connector is at least 50Ω.

[0009] As a further improvement of the utility model, the material of the metal wire is copper.

[0010] The utility model has the beneficial effects that: this device cooperates signal amplifier, spectrum analyzer can quickly locate the electromagnetic field leakage point and electromagnetic field intensity of equipment, greatly improves the efficiency of electromagnetic compatibility rectification, provides intuitive and effective positioning measures for the electromagnetic compatibility rectification of equipment, has a significant indication for the leakage point and intensity of equipment electromagnetic field disturbance, greatly improves the efficiency of electromagnetic compatibility rectification. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is the overall view of the utility model.

[0012] Fig. 2 is the front view of the utility model.

[0013] Reference signs: 1-magnetic ring, 2-metal wire, 3-BNC connector. DETAILED DESCRIPTION

[0014] In order to make the utility model purposes, technical scheme and advantages more clearly, the following is combined with the drawings and examples, and the utility model is further described in detail.It needs to be explained that the words "front", "back", "left", "right", "up" and "down" in the following description refer to the direction in the drawing, and the words "bottom surface" and "top surface", "inner" and "outer" respectively refer to the direction towards or away from the geometric center of a specific component.

[0015] As Figs. 1-2 shown, the utility model provides a kind of electromagnetic field and difference common mode interference signal detection device, including magnetic ring 1, metal wire 2 and BNC connector 3, one end of the BNC connector 3 is connected with the outer surface of the magnetic ring 1, another end of the BNC connector 3 is connected with the input end of signal amplifier, the output end of signal amplifier is connected with the input end of spectrum analyzer, the metal wire 2 is wound on the magnetic ring 1, one end of the metal wire 2 is connected with the core wire of the BNC connector 3, another end of the metal wire 2 is connected with the shell of the BNC connector 3.

[0016] As an embodiment of the utility model, the gap of the outer surface of the equipment to be measured is contacted with the magnetic ring 1.

[0017] As another embodiment of the utility model, the signal transmission line of the equipment to be measured is clamped in the inside of the magnetic ring 1.

[0018] As another embodiment of the utility model, the inner diameter of the magnetic ring 1 is at least 20mm.

[0019] As another embodiment of the utility model, the impedance of the BNC connector 3 is at least 50Ω.

[0020] As another embodiment of the utility model, the material of the metal wire 2 is copper.

[0021] The utility model provides a kind of electromagnetic field and difference common mode interference signal detection device, for the detection positioning of equipment to be measured electromagnetic disturbance leak point;The detection of equipment to be measured electromagnetic field leak intensity;The detection of difference mode interference signal, common mode interference signal intensity that equipment to be measured is conducted through power line, signal line.

[0022] This device with signal amplifier, spectrum analyzer can quickly locate the electromagnetic field leakage point and electromagnetic field intensity of equipment, greatly improve the efficiency of electromagnetic compatibility rectification. This device occupies small area, easy to use, simple operation, accurate positioning for electromagnetic compatibility rectification is a powerful help. For the equipment electromagnetic compatibility rectification provides intuitive, effective positioning measures, for the equipment electromagnetic field disturbance leakage point and intensity have a clear indication, greatly improve the efficiency of electromagnetic compatibility rectification.

[0023] The magnetic ring 1 selects a manganese zinc material with an inner diameter of 20 mm, and the metal wire 2 is wound around one side of the magnetic ring 1 as many single layers as possible to form a coil, then one end of the metal wire 2 is welded to the core wire of the 50Ω impedance BNC connector 3, and the other end of the metal wire 2 is welded to the metal shell of the BNC connector 3, and finally the BNC connector 3 is fixed on the magnetic ring 1 by hot melt glue.

[0024] The BNC connector 3 in the detection device is connected to the input end of the signal amplifier through the coaxial line, and the output end of the signal amplifier is connected to the input port of the spectrum analyzer through the coaxial cable. Adjust the detection frequency band, RBW, unit, etc. of the spectrum analyzer.

[0025] Place the magnetic ring 1 on the outer surface of the equipment to be tested, focusing on the gap, window and other positions, and observe the intensity of the detection curve of the spectrum analyzer to determine the electromagnetic field leakage point of the equipment. Or clamp the power line or signal transmission line of the equipment to be tested inside the magnetic ring 1, and observe the intensity of the detection curve of the spectrum analyzer to determine the common mode interference signal strength of the equipment. Clamp one of the power lines of the equipment to be tested or one of the signal cables inside the magnetic ring 1, and observe the intensity of the detection curve of the spectrum analyzer to determine the differential mode interference signal strength of the equipment.

[0026] The advantages of the device are that it can significantly improve the efficiency of electromagnetic compatibility rectification, it can intuitively and effectively detect the electromagnetic compatibility leakage point of the equipment, it can intuitively and clearly detect the electromagnetic field strength leaked by the equipment, it can intuitively distinguish the differential mode interference and common mode interference of the equipment, it can effectively save detection cost, it can effectively promote the rectification progress and improve the success rate of rectification, and the detection device has low cost but obvious effect.

[0027] Buy precision finished near-field probe, match signal amplifier, spectrum analyzer can carry out leakage point and leakage electromagnetic field strength detection; buy differential common mode separator, match signal amplifier, spectrum analyzer can carry out differential common mode signal interference detection.

[0028] The above is further detailed description of the utility model in combination with specific preferred embodiments, and cannot be deemed as limitation of the specific implementation of the utility model to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them shall be deemed as belonging to the protection scope of the utility model.

Claims

1. A device for detecting electromagnetic fields and differential common-mode interference signals, characterized in that, The device includes a magnetic ring, a metal wire, and a BNC connector. One end of the BNC connector is connected to the outer surface of the magnetic ring, and the other end of the BNC connector is connected to the input terminal of a signal amplifier. The output terminal of the signal amplifier is connected to the input terminal of a spectrum analyzer. The metal wire is wound around the magnetic ring, and one end of the metal wire is connected to the core wire of the BNC connector, while the other end of the metal wire is connected to the outer shell of the BNC connector.

2. The electromagnetic field and differential common-mode interference signal detection device according to claim 1, characterized in that, The magnetic ring comes into contact with the gap on the outer surface of the device under test.

3. The electromagnetic field and differential common-mode interference signal detection device according to claim 1, characterized in that, The signal transmission line of the device under test is clamped inside the magnetic ring.

4. The electromagnetic field and differential common-mode interference signal detection device according to claim 1, characterized in that, The inner diameter of the magnetic ring is at least 20 mm.

5. The electromagnetic field and differential common-mode interference signal detection device according to claim 1, characterized in that, The impedance of the BNC connector is at least 50Ω.

6. The electromagnetic field and differential common-mode interference signal detection device according to claim 1, characterized in that, The metal wire is made of copper.

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