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System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method

A technology of current probe and switching power supply, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc. It can solve the problems of not knowing the internal interference source and impedance of the noise source, ignoring the internal impedance of the noise source, etc.

Inactive Publication Date: 2007-12-26
NANJING NORMAL UNIVERSITY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] EMI filter is an effective measure to suppress electromagnetic interference, but at present, when designing EMI filters at home and abroad, the internal interference source and impedance of the noise source are not known in advance, and the internal impedance of the noise source is often ignored during design. General EMI Filter Design

Method used

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  • System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method
  • System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method
  • System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method

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Embodiment 1

[0073] As shown in Figure 1 and Figure 2, the switching power supply EMI noise source internal impedance test system based on Hilbert transform and current probe is composed of line impedance stabilization network (LISN), common mode impedance test module, signal generator and spectrum analyzer; The power line from the power grid is directly input into the line impedance stabilization network (LISN), through the common mode impedance measurement module, and then input into the switching power supply (SMPS) and the load to form a whole power circuit; the signal generator is a common mode impedance The test module provides an input signal, and then the response signal in the module is detected by the spectrum analyzer.

[0074] In the power circuit, the function of the line impedance stabilization network (LISN) is to provide power for the switching power supply, and at the same time isolate the noise on the power supply side from entering the test circuit, and also isolate the n...

Embodiment 2

[0077] As shown in Figure 1 and Figure 3, the switching power supply EMI noise source internal impedance test system based on Hilbert transform and current probe is composed of line impedance stabilization network (LISN), differential mode impedance test module, signal generator and spectrum analyzer; The power line from the power grid is directly input into the line impedance stabilization network (LISN), through the differential mode impedance measurement module, and then input into the switching power supply (SMPS) and the load to form a whole power loop; the signal generator is a differential mode impedance The test module provides an input signal, and then the response signal in the module is detected by the spectrum analyzer. In the power loop, the differential mode impedance test module is used to measure the internal impedance of the switching power supply.

[0078] The differential mode impedance test module is composed of two differential mode choke coils, two capaci...

Embodiment 3

[0080] Taking a commercial switching power supply as an example, the test is carried out. The experimental device is shown in Figure 1. The test is carried out when the circuit is connected to the standard impedance, short circuit and normal operation of the switching power supply. For the test of the internal impedance of the noise source of the switching power supply, the main points are: Common mode and differential mode are tested. Except for the difference in the impedance test module, the test methods and steps are the same. Its determination steps are as follows:

[0081] Step 1: First remove the SMPS from the main circuit, short the L and N wires, and connect a fixed impedance R std , one end of the impedance is connected to the short-circuit point of the L and N wires, and the other end is connected to the E wire; the neutral impedance of the main circuit is stable and the network is not energized, adjust the output frequency of the signal generator, and take several ...

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Abstract

An internal impedance measurement system of switch power-supply EMI noise source based on Hibert transform and current probe comprises line-impedance stable network, common mode / difference mode impedance test module, signal generator and frequency spectrum analyzer. It is featured as inputting power supply wire directly to impedance stable network then inputting to switch power supply and load for forming a complete power supply loop through common mode / different mode impedance test module. The method for measuring said internal impedance is also disclosed.

Description

technical field [0001] The present invention relates to a system and a measurement method for testing the internal impedance of a conductive electromagnetic interference (EMI) noise source, which provides a prerequisite for the suppression of conductive EMI noise, that is, the design of an EMI filter, and belongs to the technical field of electromagnetic compatibility equipment design and . Background technique [0002] EMI filter is an effective measure to suppress electromagnetic interference, but at present, when designing EMI filters at home and abroad, the internal interference source and impedance of the noise source are not known in advance, and the internal impedance of the noise source is often ignored during design. General purpose EMI filter design. Since the internal impedance of each noise source is not the same, and the matching relationship between the interference source impedance and the filter impedance directly affects the filtering effect of the filter, ...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R29/08G01R29/10
Inventor 赵阳李世锦姜宁秋沈雪梅尹海平孙焱
Owner NANJING NORMAL UNIVERSITY
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