In this paper, we consider a new methodology to obtain a PulseWidth Modulated (PWM) signal encoding an oversampled sinusoidal waveform for single-phase inverter drives. More specifically, the obtained switching pattern is optimum in the sense that it minimizes the spurious harmonic power within a certain band when subject to two constraints: a finite timeresolution and a maximum switching frequency. The first constraint is necessary when the inverter drive control is implemented by a digital system (i.e. a micro-controller unit), while the second one assures a minimum duration of each phase of the driving signal. Due to these constraints, traditional analysis tools for PWM control technique cannot be applied. We will give a detailed description of the novel encoding scheme, and we will compare its performance, in terms of spurious harmonic power, with the ones obtained with traditional modulation schemes based on the methodology reported in the literature
Generation of Optimal Constrained Switching Pattern for Single-Phase Inverter
SETTI, Gianluca
2004
Abstract
In this paper, we consider a new methodology to obtain a PulseWidth Modulated (PWM) signal encoding an oversampled sinusoidal waveform for single-phase inverter drives. More specifically, the obtained switching pattern is optimum in the sense that it minimizes the spurious harmonic power within a certain band when subject to two constraints: a finite timeresolution and a maximum switching frequency. The first constraint is necessary when the inverter drive control is implemented by a digital system (i.e. a micro-controller unit), while the second one assures a minimum duration of each phase of the driving signal. Due to these constraints, traditional analysis tools for PWM control technique cannot be applied. We will give a detailed description of the novel encoding scheme, and we will compare its performance, in terms of spurious harmonic power, with the ones obtained with traditional modulation schemes based on the methodology reported in the literatureI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.