Quantization-induced limit cycle oscillations (LCOs) in digitally controlled DC-DC converters are addressed in this paper. The novel Dyadic Digital PWM (DDPWM) is proposed to increase the effective pulse-width-modulator (PWM) resolution, as required for LCO free operation, at low cost, without sacrificing DC accuracy and with no detrimental effects on the ripple voltage. Experimental results on a synchronous buck validate the approach highlighting effective LCOs suppression and DC accuracy enhancement at 5x reduced output voltage ripple compared to thermometric dithering for the same resolution increase.

Suppression of Quantization-Induced Limit Cyclesin Digitally Controlled DC-DC Converters by Dyadic Digital Pulse Width Modulation / Usmonov, Maksudjon; Crovetti, Paolo S.; Gregoretti, Francesco; Musolino, Francesco. - ELETTRONICO. - (2019), pp. 2224-2231. ((Intervento presentato al convegno Energy Conversion Congress and Exposition (ECCE) [10.1109/ECCE.2019.8913214].

Suppression of Quantization-Induced Limit Cyclesin Digitally Controlled DC-DC Converters by Dyadic Digital Pulse Width Modulation

Maksudjon Usmonov;Paolo S. Crovetti;Francesco Gregoretti;Francesco Musolino
2019

Abstract

Quantization-induced limit cycle oscillations (LCOs) in digitally controlled DC-DC converters are addressed in this paper. The novel Dyadic Digital PWM (DDPWM) is proposed to increase the effective pulse-width-modulator (PWM) resolution, as required for LCO free operation, at low cost, without sacrificing DC accuracy and with no detrimental effects on the ripple voltage. Experimental results on a synchronous buck validate the approach highlighting effective LCOs suppression and DC accuracy enhancement at 5x reduced output voltage ripple compared to thermometric dithering for the same resolution increase.
978-1-7281-0395-2
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2765526