Voltage clamp snubbers for three level converter

Details Voltage clamp snubbers for three level converter Voltage clamp snubbers for three level converter

1998-06-30

1999-11-09

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 54, 363128, 363136, H02M 7521

Patent

active

059826460

ABSTRACT:
A three-level NPC converter includes at least one phase leg including four series coupled electrical switches having a first pair junction between the first two switches and a second pair junction between the second two switches. First and second inner switch snubber capacitors are coupled in series at a neutral junction. First and second inner switch snubber diodes are respectively coupled to the first and second pair junctions and respectively coupled at first and second inner diode-capacitor junctions to the first and second inner switch snubber capacitors. First and second inner switch snubber resistors are respectively coupled between the first and second inner diode-capacitor junctions and respective portions of a DC bus. In one embodiment, the NPC converter further includes first and second outer switch snubber diodes coupled between respective first and second inner diode-capacitor junctions and respective portions of the DC bus. This embodiment may further include first and second outer switch snubber capacitors coupled in parallel with respective first and second inner switch snubber capacitors.

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