Integration-duty cycle conversion as novel digital algorithm for PWM inverter

Abstract

In this paper, a new digital PWM algorithm for three phase power inverter is proposed. IPWM algorithm is based on the integration calculation of the reference signal and then converted into a square wave with variable duty cycle, in such manner that the area of the square wave equals to the integrated area of the reference waveform. The proposed algorithm is implemented practically using the M68000 microprocessor, the inverter is loaded by means of two types of loads, the first is resistive load and the second is a three phase induction motor. The obtained results are verified by comparison with the most known methods: sinusoidal PWM as analog method and space vector PWM as a digital one. The algorithm gives very satisfied results according to the inverter criterions.