Patent ID: 6219265
Filing Date: 2001-04-17
Classification: H02M

Abstract:
A three-point converter, comprising:an upper bridge half having main switches;a lower bridge half having main switches;an intermediate circuit having a center tap, a positive pole, a negative pole, and an intermediate circuit voltage;upper neutral point clamped diodes (NPC diodes) disposed between and connecting said upper bridge half to said center tap;lower NPC diodes disposed between and connecting said lower bridge half to said center tap;a first decoupling network connected to said upper bridge half and having terminals, one of said terminals of said first decoupling network connected to said positive pole of said intermediate circuit, another of said terminals of said first decoupling network connected to said upper bridge half, others of said terminals of said first decoupling network connected to said center tap and connected via said upper NPC diodes to said upper bridge half;a second decoupling network connected to said lower bridge half and having terminals, one of said terminals of said second decoupling network connected to said negative pole of said intermediate circuit, another of said terminals of said second decoupling network connected to said lower bridge half, and others of said terminals of said second decoupling network connected to said center tap and connected via said lower NPC diodes to said lower upper bridge half; anda commutation voltage for said main switches of said upper bridge half and said main switches of said lower bridge half being decoupled from a halved said intermediate circuit voltage independently of one another by said first decoupling network and said second decoupling network.