Device and method for measuring internal impedance of noise source of switch power supply EMI

A technology of switching power supply and measuring device, which is used in measuring device, power supply testing, measuring resistance/reactance/impedance, etc., 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., to achieve electromagnetic interference suppression , high precision, simple operation effect
CN1971292AInactive Publication Date: 2007-05-30NANJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING NORMAL UNIVERSITY
Publication Date
2007-05-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a measuring device of switch power supply EMI noise source internal impedance that comprises line impedance stabilization network, common mode / differential mode impedance test module, signal generator and spectrum analyzer; power cord is directly input to the line impedance stabilization network, passes the common mode / differential mode impedance test module, and then input to the switch power supply and load to construct a whole power circuit; the signal generator provides a input signal for the common mode / differential mode impedance test module, response signal in the module is detected by the spectrum analyzer. The measuring method of switch power supply EMI noise source internal impedance IA also disclosed. The measuring device and method can measure the all-purpose internal impedance for all kinds of noise source, but also measure the unknown impedance, the accuracy is high and the operation is simple. The measuring method can judge the nature of internal impedance and provide a precondition for designing of EMI filter that is the designing of filter fulfills the impedance matching property of filter.
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Description

technical field

[0001] The present invention relates to a device and a measurement method for measuring the internal impedance of a conductive electromagnetic interference (EMI) noise source, which provides a premise basis for the suppression of conductive EMI noise, that is, the design of an EMI filter, and belongs to the field of electromagnetic compatibility equipment design and technology field. 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...

Claims

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