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Résumé Cours électronique de puissance DC -DC Hacheur
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Résumé avec formules et graphique (courbes...) sur les hacheurs DC - DC complets
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Philosophie des montages hacheursObtenir une tension continue réglable ?
Vs
η ≪1
Ve Vs Ve Vs Ve
Tension continue
Vs
Off
Ve
Vs
Ve Vs = 0
t
Ve Vs αTd Td
η = 1 Vs = αVe
Tension discontinue
On
Ve Vs = Ve Quelle solution choisir ?
Commande en amplitude Commande en durée
simplicité nécessité d’un filtre
rapidité de réglage de Vs réponse plus lente
Introduction à la conversion continu/continu 1
rendement faible rendement excellent
, Contraintes de filtrage
Obtenir une tension continue réglable ?
K1
Lf Les commutations
Surintensité
Surtension
Ve K2 Vs àdel’
laK2 résultentdedeK1
fermeture
ouverture
Cf celles de K1
Contraintes de filtrage
module du filtre
fmax f0 fd
Par principe, le
f filtrage ne sera pas
bande passante
idéal. L’ondulation
résiduelle est fixée
par le choix de la
fréquence propre
Introduction à la conversion continu/continu du filtre 2
, Transferts d'énergie
0 ≤ t ≤ αTd αTd ≤ t ≤ Td
K1 K1
Lf Lf
Ve K2 Vs Ve K2 Vs
Cf Cf
La source alimente la charge Le filtre alimente la charge
conduction Vs discontinue
Cf
Introduction à la conversion continu/continu 3
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