Reduction of EMI in Switched Mode Converters by Shaped Pulse Transitions
2007-01-0361
04/16/2007
- Event
- Content
- 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.
- Pages
- 10
- 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, https://doi.org/10.4271/2007-01-0361.