Largely-Reduced Switching Noise Buck Type DC/DC Converter Embedding A Novel Delta-Sigma Modulation Control Scheme with White Noise Sequence

Abstract

This paper deals with a high-frequency chopper type step-down (buck) DC/DC converter system, which is designed for operating on the basis of a new conceptual delta-sigma modulation scheme developed by the authors. The novel typedelta-sigma modulator which consists of the prototype delta-sigma modulator and white noise-based multiplier is demonstrated specifically for this DC/DC converter. Large switching noise peaks suppression characteristics are illustrated and discussed by the spectrum analysis of the switched voltage of the buck type DC/DC converter. The spectrum of the converter is compared with those of prototype delta-sigma modulator and triangle carrier-based PWM generator.
And the output voltage of the DC/DC converter treated here can be controlled in the same manner as conventional PWM method.