Three-level neutral point clamping inverter circuit

H - Electricity – 02 – M

Patent

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Details

H02M 7/487 (2007.01) H02M 7/5387 (2007.01)

Patent

CA 2308080

In a three-level neutral point clamping type inverter circuit which includes a positive bus line (4), a negative bus line (5) and a neutral line (6), wherein first and second IGBTs (11), (12) are connected in series between the positive bus line (4) and a phase voltage output terminal (10) and third and fourth IGBTs (13), (14) are connected in series between the negative bus line (5) and the phase voltage output terminal (10), the three-level neutral point clamping type inverter circuit further includes a first snubber capacitor (21) provided between the positive bus line (4) and the neutral line (6), a second snubber capacitor (22) provided between the negative bus line (5) and the neutral line (6), a first snubber diode (23) having a cathode coupled to the positive bus line (4) and an anode coupled to the phase voltage output terminal (10), and a second snubber diode (24) having an anode coupled to the negative bus line (5) and a cathode coupled to the phase voltage output terminal (10).

Un circuit inverseur du blocage de point neutre à trois niveaux comprend un bus positif (4), un bus négatif (5), un conducteur neutre (6), des premier et deuxième transistors bipolaires à grille isolée (11, 12) reliés en série entre le bus positif (4) et une borne (10) de sortie de tension de phase, et des troisième et quatrième transistors bipolaires à grille isolée (13, 14) reliés en série entre le bus négatif (5) et la borne (10) de sortie de tension de phase; un premier condensateur (21) d'amortissement étant prévu entre le bus positif (4) et le conducteur neutre (6), un deuxième condensateur (22) d'amortissement étant prévu entre le bus négatif (5) et le conducteur neutre (6) ce circuit comprenant une première diode (23) d'amortissement dont la cathode est reliée au bus positif (4) et dont l'anode est reliée à la borne (10) de sortie de tension de phase et une deuxième diode (24) d'amortissement dont l'anode est reliée au bus négatif (5) et dont la cathode est reliée à la borne (10) de sortie de tension de phase.

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