A Method for Estimating the Crosstalk Voltage of the Conductors in the AC Loop with Differential Mode Excitation Source

Abstract

The invention belongs to the field of crosstalk of transmission wire harness in electromagnetic compatibility and particularly relates to a method for estimating crosstalk voltage of a wire in a direct-current circuit with a difference-module excitation source. According to the method for estimating the crosstalk voltage of the wire in the direct-current circuit with the difference-module excitation source, the interval between every two adjacent wires is measured and the distances between wires and the ground are measured according to the arrangement relation between all the wires, the wire 1 and the wire 2 are crosstalk application difference-module circuit lines, and the wire 3 is a crosstalk receiving wire; the self-capacitance per unit length, the self-inductance per unit length, the mutual capacitance per unit length and the mutual inductance per unit length between every two adjacent wires are obtained according to the method of images; a model for estimating the crosstalk voltage in the wire of the alternating-current circuit with the difference-module excitation source is established according to the inductance values and the capacitance values; a three-conductor transmission line equation is obtained according to the Kirchhoff law; the crosstalk voltage and the crosstalk current on the crosstalk receiving wire are obtained. By the adoption of the method for estimating the crosstalk voltage of the wire in the direct-current circuit with the difference-module excitation source, estimating and measurement of the crosstalk between the wires when the wires of the system are arranged according to the arrangement relation can be achieved easily and rapidly, resources are saved, and the application range is wide.

Description

technical field [0001] The invention belongs to the field of crosstalk of transmission lines in electromagnetic compatibility, and specifically relates to a method for estimating crosstalk voltage of wires in the loop by an AC loop with a differential mode excitation source. Background technique [0002] In the field of electromagnetic compatibility, there are generally two estimation methods for calculating the electromagnetic interference caused by transmission lines, the numerical method and the multi-conductor transmission line method. Based on these two methods, the AC loop crosstalk and radiation prediction of differential mode excitation sources have been studied. Zhu Danyang and Shi Changsheng of Tsinghua University used strict numerical methods to deduce the strict solution of finite-length two-wire differential mode current and radiation, but The result is only given in the form of electric field, and the crosstalk voltage value is not directly calculated. Clayton...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for estimating the crosstalk voltage of the AC loop with a differential mode excitation source to the wire in the loop, which solves the problem of estimating the interference voltage of the grounding wire in the parallel double-wire loop of the differential mode excitation source in the loop.

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