Linear impedance stabilization network

Abstract

The invention relates to a linear impedance stabilization network, which comprises a first branch circuit consisting of at least two series-connected inductors, a second branch circuit consisting of at least two series-connected inductors, a third branch circuit as a grounding wire, a first capacitor which is used for fire wire noise isolation and is in bridge connection between one end of a first branch circuit electric network side and the third branch circuit, a second capacitor for fire wire noise isolation, a third capacitor which is used for neutral wire noise isolation and is in bridge connection between one end of a second branch circuit electric network side and the third branch circuit, and a fourth capacitor which is used for neutral wire noise isolation and is in bridge connection between one end of a second branch circuit load side and the third branch circuit. The invention can measure conducted electromagnetic interference noise of high-power equipment, reduces the effect of parasitic parameters, improves performances, simplifies production process and saves production cost.

Description

technical field [0001] The invention relates to a conductive electromagnetic interference noise measuring device, in particular to a linear impedance stabilization network. Background technique [0002] Currently, the well-known linear impedance stabilization network is a standard device for conducted EMI noise measurements. The line impedance stabilization network is inserted between the power grid and the EUT, which is the equipment under test, and its functions have the following four items: [0003] (1) Provide access to 50Hz mains electricity. Since the inductance on the side of the power grid is small, it is not enough to form a large impedance at the frequency of the mains, so the mains can provide power for the device under test unimpeded, and the capacitance on the side of the power grid can further attenuate the interference signal from the power grid . [0004] (2) Isolate the radio frequency electromagnetic disturbance generated by the equipment under test (me...

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Problems solved by technology

[0008] (1) Since the linear impedance stabilization network is a high-frequency device (the frequency range specified by the standard is 10KHz-30MHz), as the power increases, the influence of parasitic parameters cannot be ignored. For example, there is an obvious inductance of the linear impedance stabilization network The parasitic capacitance effect seriously reduces the performance of the linear impedance stabilization network and affects the noise measurement results

[0009] (2) With the increase of power, the difficulty of manufacturing components in the linear impedance stabilization network increases, and the cost increases, which limits the popularization and application of the linear impedance stabilization network

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