Reduction of EMI in Switched Mode Converters by Shaped Pulse Transitions
Date Published: 2007-04-16
Paper Number:2007-01-0361
DOI: 10.4271/2007-01-0361
Citation:
Karvonen, A., Thiringer, T., Futane, P., Tuveson, T. et al., "Reduction of EMI in Switched Mode Converters by Shaped Pulse Transitions," SAE Technical Paper 2007-01-0361, 2007, doi:10.4271/2007-01-0361.
Author(s):
Andreas Karvonen - Chalmers University of Technology
Torbjörn Thiringer - Chalmers University of Technology
Pravin Futane - Chalmers University of Technology
Tryggve Tuveson - Volvo Car Corp.
Henrik Holst - Chalmers University of Technology
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 flexi-ble 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.
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