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Interleaved Zero-Current-Transition Buck Converter



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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS VOL 43 NO 6 NOVEMBER DECEMBER 2007 1619 Interleaved Zero Current Transition Buck Converter Milan Ilic and Dragan Maksimovic Senior Member IEEE Abstract This paper introduces interleaved zero currenttransition ZCT converters where two sets of switches are operating out of phase and share the load power equally Turn on transitions at zero current and a significant reduction of the losses associated with diode reverse recovery are accomplished through addition of two small inductors This paper describes a 30 kW 300 V 100 A interleaved ZCT buck converter operating at 32 kHz effective switching frequency Losses and efficiency of the experimental prototype compare favorably against the standard and interleaved hard switched buck converters Constant frequency operation with low switching losses and low output current ripple is very well suited for the realization of dc power supplies in plasma processes Index Terms DC DC power conversion modeling soft switching zero current transition ZCT I I NTRODUCTION P OWER semiconductor switches in high power applications are subject to high switching stresses and switching losses which limit the operation to relatively low switching frequencies Various soft switching techniques have been proposed to mitigate these problems 1 12 In particular zerocurrent transition ZCT 1 2 and zero voltage transition ZVT 10 techniques incorporate soft switching functions into standard pulsewidth modulated PWM converters so that the switching losses can be reduced ideally without increasing the switch voltage or current stresses For high power high voltage applications insulated gate bipolar transistors IGBTs are preferred devices Hence ZCT techniques provide better results than ZVT techniques In the ZCT technique proposed in 1 an auxiliary circuit forces the switch current to zero prior to turn off thus reducing the turn off losses due to the current tailing of the IGBTs However the turn on of the main switch



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