Vladimirs Novikovs

Case Shielding Efficiency, High Frequency Technology

We have presented the comparison of different electromagnetic (EM) shielding case vent shapes (different shape, but same surface) and estimate EM shielding efficiency for one mode E wave. EM shield is the integral part of the effective functioning devices. By changing type of the shape vent, it is possible to minimize EM impact. It is offered to value the shielding efficiency, by using scattering S matrix in analysis. Ill. 15, bibl. 8 (summaries in English, Russian and Lithuanian).

Matrix frequency converter conducted and radiated emissions

Matrix converter inherently exhibits sinusoidal input current waveforms and has less stressful output voltage waveforms, but it is causing problems with conducted and radiated emissions. This paper deals with matrix converter emitted disturbances from point of view of electromagnetic compatibility (EMC) standard EN61800-3 and allocates the sources of undesirable emissions.

Modified estimation of shielding efficiency for hole

For reduction of the impact of electromagnetic field on parameters of electronic equipment, shielding in many different shapes and qualities is used. The quality of the shielding is dependent on size, shape and amount of openings in the body of the shield. In electromagnetic immunity and emission tests it is very difficult to predict the shielding efficiency from theory of refraction, reflection and diffraction due to the very complicated shape and material mix in the design configuration of multilayer PCB, supports, covers and screens. For this reason in order to build up and make calculations of scattering matrix parameters as the estimation of the shielding efficiency in the given frequency range we propose to use the drawn 3D electromagnetic model.

Troubleshooting of Matrix Frequency Converter Conducted and Radiated Emissions

Troubleshooting of Matrix Frequency Converter Conducted and Radiated Emissions Matrix converter inherently exhibits sinusoidal input current waveforms and has less stressful output voltage waveforms, but it is causing problems with conducted and radiated emissions. This paper deals with matrix converter emitted disturbances from point of view of electromagnetic compatibility (EMC) standard EN61800-3 and allocates the sources of undesirable emissions using standard equipment used for EMC assessment according to variety international EMC standards and discusses methodology of troubleshooting flow, using low cost equipment available in almost every laboratory of Industrial Electronics and Electrical Engineering.