Far-Field Radiation Prediction and Analysis of a Power Converter With V-Shaped Flat Cables Based on PEEC

Abstract

The far-field radiation generated by a power electronic converter with V-shaped cables is a key theoretical problem with engineering application significance. The irregular V-shaped antenna is very difficult to calculate analytically, making a precise prediction of the power converter's far-field radiation very challenging. In this work, the far-field radiation of a power converter with flat shielded cables is modeled and predicted using the retarded partial element equivalent circuit ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${\mathbf{\tau}}$</tex-math></inline-formula> PEEC) theory. The τPEEC modified node analysis circuit model of a metal radiator is introduced first, and then the radiator's input impedance formula is deduced. The τPEEC computation model of the V-shaped radiator, which includes the ground plane reflection effect, is developed for the typical far-field radiation test configuration, and the numerical calculation of the far-field radiation transfer function is obtained using the field strength sensor method. To test the suggested τPEEC approach, a 30-MHz low-side buck converter with flat shielded cables is built, and its 10-m far-field radiation strength is predicted. The V-shaped radiator's radiation characteristics are also investigated, and a design for suppression is proposed and demonstrated.