Performance evaluations of delta-sigma modulated voltage source inverter

Abstract

The delta-sigma modulator is effectively applied to a voltage source inverter system with PWM pattern generating scheme. The major feature of delta-sigma modulator is the inherent nature of the spread spectrum characteristic in addition to simple configuration scheme. Besides, delta-sigma modulator can be considered as a sort of error amplifier. Using proposed delta-sigma modulator, an automatic amplitude control function can be realized. In this paper, the automatic amplitude control performance of a delta-sigma modulated voltage source inverter is presented. The results of computer simulation and FFT analysis indicate that the output influences due to DC source voltage variations in the input side of the inverter are sufficiently suppressed by introducing delta-sigma modulator. Furthermore, a possibility of system design simplification is described for the voltage-fed inverter in this paper.