Walsh Function based Reconstruction Method of Triangular-wave PWM Command Voltage Waveform

Abstract

This paper proposes a Walsh-function based reconstruction-method of command voltage waveform of a PWM inverter. The Fourier harmonics of PWM inverter output voltage show that the PWM switching harmonics spread toward lower frequency range and it makes difficult to reconstruct the PWM command voltage waveform especially in the case when the command voltage waveform has sharp edge. On the other hand, the Walsh harmonics show very good separation between original command voltage component and PWM switching component. Therefore, the Walsh-function based reconstruction-method can reconstruct the PWM command voltage waveform correctly. These remarkable features of the proposed method are clarified by several simulation results.