Characteristic evaluation of full bridge delta-sigma modulated inverter with sampling interval jitter component

Abstract

Switching power converters are widely used because of its saving energy feature. Pulse width modulated (PWM) inverter causes large switching noise peaks on the carrier frequency. But delta-sigma modulated inverter does not induce large noise component and this makes an advantage of avoiding EMI problems. Although delta-sigma modulator operates on the assumption that the sampling interval is uniform, it is necessary to examine the influence of the sampling interval variation. This paper examines the sampling interval jitter component effect on the output voltage characteristics of delta-sigma modulated inverter. From the investigation, it is plain that the low frequency harmonic components increase in compliance with jitter rate.