Ensuring Electromagnetic Compatibility of Microprocessor Devices

Abstract

The research is devoted to the problem of electromagnetic compatibility of toroidal chokes with microprocessor elements of printed circuit boards. The scientific novelty of the work lies in the determination of the most favorable option for the location of the chokes through the minimization function. The analysis of target vector functions and the most effective option is carried out. The purpose of the study is to determine the permissible location of the chokes, at which the electromagnetic interference, they create for the microprocessor elements of the printed circuit board, will be minimal. The object of the study is a printed circuit board of a microprocessor-based device for measuring the grounding resistance of supports of high-voltage power lines, in the power circuit of which toroidal chokes are used. The subject of this work is the electrophysical properties of toroidal chokes, which are sources of electromagnetic interference for microprocessor elements of control and measuring instruments. The research methodology consists in carrying out numerical experiments to calculate the electromagnetic field with subsequent analysis of the obtained vector functions of the magnetic field strength H on the board surface. The assessment of the influence of interference caused by chokes is carried out using the developed mathematical model and numerical methods for calculating the electromagnetic field. For computational calculations, the authors have developed a software algorithm implemented using the Delphi programming language. The choice of the mutual arrangement of the chokes on the microprocessor integrated circuit is carried out as a result of solving the optimization problem by the gradient method, taking into account the given restrictions on the condition of electromagnetic compatibility. To assess electromagnetic compatibility, a design model of a printed circuit board of a microprocessor device with toroidal chokes was developed. As a result of a numerical experiment, a method for automated determination of the location of toroidal chokes within an integrated microcircuit of resistance devices of the proposed control of electrodes of overhead power transmission line supports was tested. As a result of research, it was found that for electromagnetic compatibility of microelectronic devices, it is sufficient to place the toroidal chokes of power circuits closer to the corners of the printed circuit board. In other design cases, the EMC class 1 requirement is not met.