Digital Pulsewidth Modulation (DPWM) Using Direct Digital Synthesis

Wide-bandgap semiconductor power devices are being adopted to increase efficiency and switching frequency for power converters. This requires a demand for higher resolution digital pulsewidth modulation (DPWM) in digitally controlled power converters. This is because, in a digitally controlled dc–dc converter, steady-state limit-cycle oscillations can exist if the resolution of DPWM is less than the ADC resolution. This article proposes a cost-competitive, high-performance, functionally integrated with a small package-sized, a complete direct digital synthesis-based DPWM architecture to achieve a high resolution, linear, monotonic behavior, and extremely fast frequency hopping ability. This article presents a detailed analysis of the new DPWM architecture. Simulation and experimental results are presented to verify the analysis. This article also discusses the various advantages and numerous applications addressed by the proposed method.