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Symmetric insertion loss measuring system of passive EMC filter

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: 2019-04-02
上海埃德电子股份有限公司
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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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  • Symmetric insertion loss measuring system of passive EMC filter
  • Symmetric insertion loss measuring system of passive EMC filter
  • Symmetric insertion loss measuring system of passive EMC filter

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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 symmetric insertion loss measuring system of a passive EMC filter. The system comprises a signal generator, an unbalanced-balanced converter, a passive EMC filter, a balun, and a measuring receiver that are connected successively. The balun is formed by unbalanced-balanced converter switching input and output ends. Defects in the prior art are overcome. With the two-port VNA, measurement of the symmetric insertion losses of the passive EMC filter is realized within the range of from 10kHz to 100Mhz according to the standard of a GB / T7343-2017 / IEC / CISPR17-2011 type passive EMC filter suppression characteristics measurement method, so that the cost of investment on the four-port VNA is saved.

Description

technical field [0001] The invention relates to a passive EMC filter symmetrical insertion loss measurement system, which belongs 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, Figure 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 transfor...

Claims

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Application Information

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