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Alimentatori switching (SMPS) Buck Boost Flyback

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Alimentatori switching (SMPS) Buck Boost Flyback

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Alimentatori switching (SMPS) Buck Boost Flyback

  1. 1. Tecnologie Elettriche Elettroniche e Applicazioni / Installazione Manutenzione Impianti - Ing. Pasquale Alba 2015 Alimentatori Switching SMPS Switch-Mode Power Supply Buck, Boost, Buck-Boost, Flyback, Forward 1 Pro manuscripto - Dispensa didattica - UDA Istituto Professionale per l'industria e l'Artigianato "Salvo D’Acquisto" Bagheria STAMPA SOLO SE NECESSARIO
  2. 2. Tecnologie Elettriche Elettroniche e Applicazioni - Ing. Pasquale Alba 2016 Buck o Step-down 2 Vi > Vo
  3. 3. Tecnologie Elettriche Elettroniche e Applicazioni - Ing. Pasquale Alba 2016 Buck o Step-down 3 Con rettificazione sincrona A synchronous buck converter is a modified version of the basic buck converter circuit topology in which the diode, D, is replaced by a second switch, S2. This modification is a tradeoff between increased cost and improved efficiency. In a standard buck converter, the flyback diode turns on, on its own, shortly after the switch turns off, as a result of the rising voltage across the diode. This voltage drop across the diode results in a power loss which is equal to where: • VD is the voltage drop across the diode at the load current Io, • D is the duty cycle, and • Io is the load current.
  4. 4. Tecnologie Elettriche Elettroniche e Applicazioni - Ing. Pasquale Alba 2016 Boost o Step-up 4 Vi < Vo
  5. 5. Tecnologie Elettriche Elettroniche e Applicazioni - Ing. Pasquale Alba 2016 Buck-Boost 5 E’ invertente. Può produrre Vo maggiore o minore di Vi. Equivale al Flyback ove al posto del trasformatore è inserito un semplice induttore.
  6. 6. Tecnologie Elettriche Elettroniche e Applicazioni - Ing. Pasquale Alba 2016 Flyback 6 E’ isolato grazie al trasformatore. I due schemi principali sono: controllo in modo tensione e controllo in modo corrente. Quest’ultimo è più diffuso perché più stabile. Entrambi i modi richiedono la necessità di avere l’informazione della tensione uscita. Ci sono tre modi per fare questo: 1) usare un fotoaccoppiatore sul secondario per spedire un segnale al controller 2) avvolgimento secondario separato sul trasformatore 3) campionare la tensione sul primario durante la scarica riferita alla tensione DC stazionaria del primario. The third consists on sampling the voltage amplitude on the primary side, during the discharge, referenced to the standing primary DC voltage.
  7. 7. Tecnologie Elettriche Elettroniche e Applicazioni / Installazione e Manutenzione - Ing. Pasquale Alba Credits Riconoscimenti Si ringraziano per immagini, application notes e datasheet: • it.wikipedia.org • Texas Instruments • tutti coloro che hanno reso disponibili su Internet le informazioni qui riportate 7 La presente dispensa ha scopo didattico senza fine di lucro. Contiene sia contenuto originale dell’autore che contenuti reperiti su Internet. Tutti diritti sui contenuti reperiti, appartengono, ove coperti da copyright, ai rispettivi proprietari. Ove si ritenga esistano violazioni di copyright, imprecisioni o errori si prega di segnalarli a: ing.pasqualealba@gmail.com . Questo materiale può essere diffuso citando la fonte. In caso si voglia stampare si consiglia di usare un layout con 4 diapositive per ogni pagina. Le informazioni qui contenute sono ritenute accurate, tuttavia l’autore non esclude che siano presenti errori o imprecisioni e declina ogni responsabilità diretta o indiretta per danni a persone o cose derivanti da un eventuale loro uso a scopo professionale; chi ne fa uso se ne assume pienamente la responsabilità.

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