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Source impedance stable network

A technology for stabilizing network and source impedance, applied in impedance networks, multi-terminal pair networks, instruments, etc., can solve the problems of inability to distinguish the proportion of common mode components and differential mode components, insufficient, and not ideal.

Inactive Publication Date: 2009-11-11
XI AN JIAOTONG UNIV
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Problems solved by technology

In each measurement of the traditional source impedance stabilization network, only the interference noise spectrum on one line of the live line or the neutral line of the equipment under test can be given, and the respective proportions of the common-mode components and differential-mode components cannot be distinguished.
Although this has certain guiding significance for the research work of electromagnetic interference, it is not enough.
Therefore, the existing technical means are not ideal enough and need to be further improved.

Method used

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Embodiment Construction

[0013] see figure 1 , the present invention removes a 50Ω / 50μH+5Ω type source impedance stabilization network with a 50 ohm standard resistor (the removed resistor is shown by the dotted line in the figure), which is used to filter out the spurious signal of the power grid and detect the device under test via the live wire " L" and the neutral line "N" conduct the conducted interference signal to the source impedance stabilization network. A transformer coupling circuit, connected to the original 50 ohm impedance, from the impedance relationship to ensure that the source impedance stabilization network meets the basic requirements of the electromagnetic compatibility standard, at the same time, to ensure that the equivalent impedance of the source impedance stabilization network in the interference detection frequency band remains 50 ohms variable, coupling out the common-mode and differential-mode signals of the device under test.

[0014] see figure 2 , The source impedan...

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Abstract

The invention relates to a source impedance stable network, which is used as a standard load for transmitting electromagnetic interference measurement. Compared with the conventional source impedance stable network, the source impedance stable network is characterized in that a 50-ohm standard load is removed from the source impedance stable network and is replaced by a coupling circuit of which the equivalent input impedance is 50 ohms. The improved source impedance stable network does not measure the electromagnetic interference of a live wire or a zero line independently, but proceeds from the definitions of common-mode interference and differential mode interference, uses the coupling circuit to obtain the common-mode interference and the differential mode interference at the same time on the basis of detecting interference signals of the live wire and the zero line at the same time. The source impedance stable network can be widely applied to measurements of various conduction electromagnetic interferences.

Description

technical field [0001] The invention belongs to the field of power electronics research, in particular to a source impedance stabilization network for conducting electromagnetic interference measurement. Background technique [0002] In the conducted interference measurement system, the source impedance stabilization network, as the standard electromagnetic interference load of the equipment under test, is one of the indispensable equipment for measurement. According to the generation mechanism, propagation path and suppression means of electromagnetic interference signals, conducted interference is divided into common-mode interference and differential-mode interference. On the live wire or neutral wire at the input end of the equipment under test, there are both common-mode interference and differential-mode interference. In each measurement of the traditional source impedance stabilization network, only the interference noise spectrum on one line of the live line or the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/01H03H7/06H03H7/09G01R1/28G01R31/00
Inventor 陈文洁杨帆杨旭王兆安
Owner XI AN JIAOTONG UNIV
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