A Method-of-Moments Model for Determination of Radiated Magnetic Field from Switch-Mode Power Supplies Components using Near-Field Measurement Data
关键词:
Electromagnetic compatibility, method-of-moments, near-field measurement, switch-mode power supply摘要
Electromagnetic interference due to switching-mode power supplies (SMPSs) is a great concern for the designers of electrical and electronic equipment. In this paper, we propose a method-of-moments model for efficient determination of radiated magnetic field due to SMPSs mounted on printed circuit boards (PCBs). This model involves three stages. First, the magnetic field distribution on a given rectangular plan in the vicinity of the board is measured. The measured data are then used to identify the equivalent source currents on the surface of the radiating board by the method-of-moments. Having determined the radiating sources, the magnetic field distribution at a desired distance from the PCB can be computed. The main feature of the proposed model is its direct approach for reconstruction of the radiating current sources, which makes it much faster than the conventional techniques, involving heuristic optimization algorithms. The validity of the proposed technique is demonstrated by comparing the actual and predicted far-field magnetic field radiations due to a small electrical loop, a high frequency inductor as a typical radiating magnetic field component of SMPSs, and a microstrip transmission line, which simulating conduction paths on the PCB.
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