Aliasing effects on uniformly sampled PWM

Abstract

Uniformly sampled PWM is one of the most used pulse width modulation techniques in power electronics applications. The popularity of this technique arises from the fact of its simplicity to be digitally implemented. From the historical point of view, uniformly sampled PWM was originally used in the aim of sinusoidal waveform generation. This paper investigates and discusses, through simulation, the effects of the aliasing problem on the performance of uniformly sampled PWM in such cases in which this technique is used to represent modulating signals other than the sinusoidal. Moreover the paper suggests a solution for the problem and hence improves the performance of the produced PWM signal in these cases.