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 311
- Downloads 8
Simple and multiple relations between motivational strategies and academic achievement
The purpose of this study was to investigate the relationship between students' motivational strategies and their academic achievement. The research method was descriptive-correlation. Statistical population was about 30...
Check Active packaging Has antioxidant properties in Food products
The word means the mass migration from packaging material to its contents. Not much change in immigration mechanical properties and permeability of packaging .In a biological system, antioxidant as a substance that when...
Design of a Low - Power Switched - Capacitor Bandpass Filter in 0.18?m CMOS Technology with Quality Factor Tunability
In this paper, the design of low - power second - order switched – capacitor bandpass filter is presented in 0.18?m CMOS technology. Instead of two operational amplifiers in conventional structures only...
Designing, simulation and layout of 6bit full adder in cadence software
The bit full adders are highly regarded because of their high application in the electrical circuits. There are several factors that contribute to the superiority of one full adder to another one such as high speed, low...
ISOLATION AND SEQUENCE ANALYSIS OF SOME GENES INVOLVED IN STARCH METABOLISM OF THE COMMON HYACINTH
Studies were conducted at the University of Sussex on the common hyacinth with a view to isolating and sequencing some of the genes that govern starch metabolism in this geophyte. Results indicated that the sequence gene...