Application of Random PWM Technique for Reducing EMI
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2013, Vol 6, Issue 9
Abstract
A pulsewidth modulation (PWM)-controlled active filter generates harmonics at the switching frequency and its multiples in the RF range, and the concentrated power spectrum may produce electromagnetic interference (EMI) problems. In this paper, the random PWM (RPWM) technique is applied in orderto spread the noise spectrum over a wide range, thus, considerably reducing the amplitudes of these harmonics and the consequent EMI problems. To study the operation of active filters, the case of an ac/dc converter along with a power-factor corrector is considered as a nonlinear load and a series active filter, respectively.A line impedance stabilization network is used to study the RF noise emanating fromthe converter. A noise model to study the EMI emission is presented and used in this paper. Theoretical analysis of the RF noise power spectrum is carried out in orderto demonstrate the advantages of the RPWM technique over conventional PWM. Experimental results confirm the validity of the theoretical calculations and simulation results, and demonstrate the effectiveness of applying the RPWM technique in reducing the RF noise level.
Authors and Affiliations
Abdolreza Esmaeli| Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, Tehran, Iran., Zahra Kohshari| Faculty of Electrical Engineering, MaziarUniversity, Nour, Iran, email: aesmaeli@aeoi.org.ir
Keywords
Related Articles
- EP ID EP6248
- DOI -
- Views 290
- Downloads 8
Standards and certification procedures in organic agriculture: An overview focusing on organic crop production
The organic agriculture is a holistic production management system which promotes and enhances agro-ecosystem health, including biodiversity, biological cycles and soil biological activity. The primary goal of organic ag...
Domed Roofs for Better Energy Efficient Architecture; Experimental Validation of Wind Pressures on a Hemispherical Dome
This paper is to measure wind velocity on dome in case of old houses of Isfahan and Kashan in Iran. To analyze wind velocity, the pressure coefficient for zero and ninety degrees angles were calculated separately for tho...
An investigation of the relationship between senior line and staff managers’ development in Ministry of Education and organizational effectiveness in the Educational System of Iran
The purpose of this research is to investigate the relationship between the top executives in different provinces and the managers’ development of Education Ministry with the effectiveness of educational organizations. T...
The Effect of Liquidity Management on Reducing the Stock Price Crash Risk (Case Study: Companies Listed in Tehran Stock Exchange)
Present study examines the effect of Liquidity management on reducing the risk of decrease in stock prices. Decrease in stock prices can be due to weak and inefficient strategies taken by managers. One of the most import...
The Study of the Relationship between Components of Holographic Organization and Knowledge Management in Payame Noor University East Azerbaijan
The aim of this study was to investigate the relationship between the components of the holographicorganization and knowledge management.The statistical population included all faculty members Payame Noor University East...