Open AccessPartial O-state Clamping PWM Method for Three-Level NPC Inverter with a SiC Clamp Diode
Author(s) -
Nam-Joon Ku,
Rae-Young Kim,
Dong-Seok Hyun
Publication year - 2015
Publication title -
journal of electrical engineering and technology/journal of electrical engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2093-7423
pISSN - 1975-0102
DOI - 10.5370/jeet.2015.10.3.1066
Subject(s) - clamping , clamper , inverter , diode , clamp , pulse width modulation , insulated gate bipolar transistor , materials science , pin diode , step recovery diode , switching time , modulation index , electronic circuit , electronic engineering , computer science , control theory (sociology) , electrical engineering , engineering , optoelectronics , voltage , schottky diode , computer vision , control (management) , artificial intelligence
This paper presents the reverse recovery characteristic according. to the change of switching states when Si diode and SiC diode are used as clamp diode and proposes a method to minimize the switching loss containing the reverse recovery loss in the neutral-point-clamped inverter at low modulation index. The previous papers introduce many multiple circuits replacing Si diode with SiC diode to reduce the switching loss. In the neutral-point-clamped inverter, the switching loss can be also reduced by replacing device in the clamp diode. However, the switching loss in IGBT is large and the reduced switching loss cannot be still neglected. It is expected that the reverse recovery effect can be infrequent and the switching loss can be considerably reduced by the proposed method. Therefore, it is also possible to operate the inverter at the higher frequency with the better system efficiency and reduce the volume, weight and cost of filters and heatsink. The effectiveness of the proposed method is verified by numerical analysis and experiment results