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Metodi di modulazione di larghezza di impulso a spettro diffuso by Lavanya, S. Nithya

Metodi di modulazione di larghezza di impulso a spettro diffuso

by S. Nithya Lavanya
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Book cover type: Paperback
  • ISBN13: 9786208611637
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Edizioni Sapienza
  • Publisher Imprint: Edizioni Sapienza
  • Publication Date:
  • Pages: 160
  • Original Price: USD 91.0
  • Language: Italian
  • Edition: N/A
  • Item Weight: 223 grams
  • BISAC Subject(s): Electronics / General

Negli ultimi anni, l'inverter con sorgente di tensione modulata ad ampiezza di impulsi (PWM-VSI) si sta diffondendo nelle applicazioni degli azionamenti a velocità variabile grazie al controllo interno della tensione e della frequenza all'interno dell'inverter. Per regolare sia la tensione che la frequenza, sono stati sviluppati vari metodi PWM per gli azionamenti alimentati da VSI. Per generare il modello di impulsi per gli azionamenti alimentati da VSI, esistono principalmente due approcci: l'approccio digitale (approccio vettoriale spaziale) e l'approccio a confronto di portanti. Nell'approccio digitale, i tempi di commutazione vengono calcolati e alimentati dai contatori, che generano gli istanti di commutazione. Nell'approccio a confronto con la portante, invece, il segnale di riferimento o modulante viene confrontato con un segnale portante (solitamente triangolare) e i punti di intersezione determinano gli istanti di commutazione per i dispositivi dell'inverter. Tra questi due approcci, quello del confronto della portante sta guadagnando importanza per la sua più semplice implementazione.

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