Reduction of EMI in Switched Mode Converters by Shaped Pulse Transitions
Paper in proceeding, 2007

An idea of reducing the amplitude of higher order harmonic frequencies from PWM switching pattern is presented and analyzed in this paper. For experimental studies a flexible curve shaping circuit was developed and implemented for achieving and controlling smooth transitions in a DC/DC PWM controlled converter for a 12 V system. A comparison between trapezoidal and sinusoidal transitions is made and it is found that a sinusoidal transition gives better EMI performance without increasing the switching losses. In order to further reduce the EMI, a strategy of controlling the output voltage transitions in a MOSFET by ”pre-charging” its gate is derived and investigated. The developed practical circuit is tested with sinusoidal reference for a purely resistive load and an R-L load. Frequency responses obtained from simulations and measurements are compared and discussed.

EMC

EMI

PWM converter

DC/DC

Author

Andreas Henriksson

Chalmers, Energy and Environment, Electric Power Engineering

Henrik Holst

Chalmers, Energy and Environment, Electric Power Engineering

Tryggve Tuveson

Torbjörn Thiringer

Chalmers, Energy and Environment, Electric Power Engineering

Pravin Futane

Chalmers, Energy and Environment, Electric Power Engineering

SAE World Congress 2007, April 16-19, 2007, Cobo Center, Detroit, MI, USA

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.4271/2007-01-0361

More information

Latest update

12/16/2019