Title :
Improved zero-current transition converters for high power applications
Author :
Mao, Hengchun ; Lee, Fred C. ; Xunwei Zhou ; Boroyevich, Dushan
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Existing zero-current transition (ZCT) converters do not solve main switch turn-on problems and require auxiliary switches to be turned off with high current, and therefore are not suitable for high power applications. Novel ZCT schemes proposed in this paper enable all main switches and auxiliary switches to be turned on and off under zero current conditions. The zero-current switching at both turn-on and turn-off not only reduces switching losses significantly, but also eliminates the necessity of passive snubbers due to the much reduced switch stress. The cost of the auxiliary switches can be reduced compared to the existing ZCT schemes due to their zero-current turn-off. The proposed technology is well suited for DC-DC and three-phase converters with IGBTs, MCTs and GTOs. Theoretical analysis, computer simulation and experimental results are presented to explain the proposed schemes
Keywords :
DC-DC power convertors; MOS-controlled thyristors; insulated gate bipolar transistors; losses; power semiconductor switches; switching circuits; thyristor convertors; DC-DC converters; GTO; IGBT; MCT; auxiliary switches; computer simulation; switch stress reduction; switch turn-on problems; switching losses reduction; three-phase converters; zero-current switching; zero-current transition converters; Computer simulation; Costs; DC-DC power converters; Insulated gate bipolar transistors; Snubbers; Stress; Switches; Switching converters; Switching loss; Zero current switching;
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3544-9
DOI :
10.1109/IAS.1996.560223
