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TD hacheurs CORRECTION électronique de puissance

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Exercice n°1: étude d'un hacheur série un quadrant alimentant une machine à courant continu Exercice n°2: étude de l'influence de la résistance de l'inductance dans un hacheur élévateur Exercice n°3: étude d'un hacheur quatre quadrants alimentant d'un monte-charge Exercice n°4: étud...

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  • August 30, 2021
  • 16
  • 2020/2021
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Exercice n°1: étude d'un hacheur série un quadrant alimentant une machine à courant continu

Exercice n°2: étude de l'influence de la résistance de l'inductance dans un hacheur élévateur

Exercice n°3: étude d'un hacheur quatre quadrants alimentant d'un monte-charge

Exercice n°4: étude d'un hacheur de type flyback utilisé en chargeur de batterie 24V

, EXERCICE n°1




T



fm
D




Phase active : 0 < t < αTd, T est fermé, alors uch = E > 0, donc D bloquée
Roue libre : αTd < t < Td, T ouvert mais iL ≠ 0, alors D passante, donc uch = 0

, EXERCICE n°1
Q.1 Tracer l'allure de la tension uch(t) pour une période de découpage
uch(t) fm(t) T



uch(t)
fm(t)



Q.2 En vous aidant de la question précédente, calculer la valeur de la source E nécessaire à la réponse du Cdc
DONNEES : le rapport cyclique α = 0,792 ; la fréquence de découpage fd = 2,5 kHz ; le courant moyen dans l'induit Ich = 6A ; la fcem E1 = 99V ;
le régime de conduction est continu
ℎ 0

1 ℎ .

1 99
⇒ 125
0,792

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