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Reduction of EMI in Switched Mode Converters by Shaped Pulse Transitions

Andreas Karvonen (Institutionen för energi och miljö, Elteknik) ; Henrik Holst (Institutionen för energi och miljö, Elteknik) ; Tryggve Tuveson ; Torbjörn Thiringer (Institutionen för energi och miljö, Elteknik) ; Pravin Futane (Institutionen för energi och miljö, Elteknik)
SAE World Congress 2007, April 16-19, 2007, Cobo Center, Detroit, MI, USA (2007)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: EMC, EMI, DC/DC, PWM converter

Denna post skapades 2008-01-07. Senast ändrad 2017-10-03.
CPL Pubid: 64604


Institutioner (Chalmers)

Institutionen för energi och miljö, Elteknik (2005-2017)



Chalmers infrastruktur

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