Thesis

Reduction of RFI by selective zero switching of SCR dimmers

The objective of this project is to investigate the possibility of reducing Radio Frequency Interference (RFI) by selective zero switching control instead of phase control of SCR dimmer. A simple one chopped waveform model was assigned. The Radio Frequency (RF) power of phase control was analyzed. The maximum interference was found to occur at 90°. The RF power of sine half wave rectifier and the RF power of 8 cycle selective zero switching were also analyzed. Both of them present a low level of RF power. The reduction of RFI was thus predicted by compositing both burst firing and phase control.

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