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A passive EMC filter symmetrical insertion loss measurement system

A technology of insertion loss and measurement system, applied in measurement devices, measurement of electrical variables, dielectric performance measurement, etc., can solve problems such as increasing enterprise costs, inaccurate measurement of symmetrical insertion loss of passive EMC filters, etc., to save costs. Effect

Active Publication Date: 2021-04-09
上海埃德电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, it is inaccurate to measure the symmetrical insertion loss of the passive EMC filter with the above-mentioned 1:1 transformer, and it is appropriate to measure it with a 4-port VNA
[0004] Manufacturers of EMC filters use 2-port VNAs. In order to measure the symmetrical insertion loss of passive EMC filters according to the above standards, they must invest in a 4-port VNA, which increases the cost of the company.

Method used

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  • A passive EMC filter symmetrical insertion loss measurement system
  • A passive EMC filter symmetrical insertion loss measurement system
  • A passive EMC filter symmetrical insertion loss measurement system

Examples

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Embodiment Construction

[0031] Below in conjunction with specific embodiment, further illustrate the present invention.

[0032] image 3 The passive EMC filter symmetric insertion loss measurement system schematic diagram provided for the present embodiment, the passive EMC filter symmetric insertion loss measurement system consists of a signal generator, an unbalanced-balun, a passive EMC filter, a balanced -The unbalanced transformer and the measuring receiver are connected sequentially. The output of the signal generator is connected to the input of the unbalanced-balun, the output of the unbalanced-balun is connected to the input of the passive EMC filter, the output of the passive EMC filter is connected to the input of the balun, and the balanced - The output of the balun is connected to the input of the measuring receiver.

[0033] Wherein, the balun at the output end of the passive EMC filter is formed by reversing the input and output ends of the balun at the input end of the passive EMC ...

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Abstract

The invention provides a passive EMC filter symmetric insertion loss measurement system, which is composed of a signal generator, an unbalanced-balun, a passive EMC filter, a balanced-unbalanced converter, and a measuring receiver connected in sequence; The balun-unbalanced converter is formed by exchanging input and output ends of the unbalanced-balanced converter. The system provided by the present invention overcomes the deficiencies in the prior art, and uses a 2-port VNA to realize the frequency range from 10kHz to 100Mhz, according to "GB / T7343‑2017 / IEC / CISPR17‑2011, passive EMC filter suppression characteristics "Measurement method" standard to measure the symmetrical insertion loss of passive EMC filters, saving the cost of investing in a 4-port VNA.

Description

technical field [0001] The invention relates to a passive EMC filter symmetrical insertion loss measurement system, belonging to the technical field of passive EMC filter suppression characteristic measurement. Background technique [0002] In the standard "GB / T7343-2017 / IEC / CISPR17-2011, Measurement method for passive EMC filter suppression characteristics", section 5.2.4, Image 6 In "Test circuit for symmetrical insertion loss measurement (taking 4-wire filter as an example)", there are two 1:1 transformers W, such as figure 1 shown. This standard stipulates that the test is carried out in a 50 ohm system, and the initial frequency of the test is 10kHz. That is, from the frequency range above 10kHz (for example, from 10kHz to 30MHz, or even higher frequency), the two 1:1 transformers must meet the following three requirements: first, its transmission ratio is 1:1; second, combine figure 2 , when a 50-ohm load is connected to the C and D terminals of the transformer, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
CPCG01R27/2694
Inventor 柳光福
Owner 上海埃德电子股份有限公司