Dynamic OSR dithered sigma-delta modulation in solid state light dimming

SUMMARY Pulse width modulation (PWM) is the most common way to control switching regulation and digital dimming. This paper presents a way to implement digital dimming by means of a dithered sigma–delta modulator with dynamic oversampling ratio. The system has been modeled in SystemC-WMS and implemented in a board using a commercial microcontroller. Simulation results show conducted electromagnetic interference reduction compared to PWM and flickering reduction with respect to classic sigma-delta modulation. Copyright © 2011 John Wiley & Sons, Ltd.

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