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Design and analysis of ZVZCS converter with active clamping

The principle of operation is explained and analyzed. The features and design considerations of the new converter are also illustrated and verified on an 1.8 kW, 100 kHz IGBT based experimental circuit. | J.Sivavara Prasad et al, International Journal of Computer Science & Communication Networks,Vol 1(1),September-October 2011 Design and analysis of ZVZCS converter with active clamping Mr.J.Sivavara Prasad 1 Dr.Ch.Sai babu 2 Dr.Y.P.Obelesh 3 1. Mr. J.Sivavara Prasad, Asso. Professor in Dept. of EEE, Aditya College of Engg., Madanapalle 2. Dr.Ch. Sai babu, Professor in Dept. of EEE, JNTU Kakinada. 3. Dr.Y.P.Obelesh, HOD in Dept. of EEE, Lakkireddy Balreddy Institute of Technology, Mylavaram. Abstract-The design and analysis of ZVZCS converter with active clamping is proposed. By adding a secondary active clamp and controlling the clamp switch moderately, ZVS (for leading leg switches) and ZCS (for lagging leg switches) are achieved without any lossy components, the reverse avalanche break down of leading-leg IGHTs or the saturable reactor in the primary. Many advantages including simple circuit topology, high efficiency, and low cost make the new converter attractive for high voltage and high power (> 10 kW) applications. The principle of operation is explained and analyzed. The features and design considerations of the new converter are also illustrated and verified on an 1.8 kW, 100 kHz IGBT based experimental circuit. 1.INTRODUCTION IGBTs are widely used in the switching power conversion applications because of their distinctive advantages such as easiness in drive and high frequency switching capability. The performance of IGBTs has been continuously improved and the latest IGBTs can be operated at 10-20 kHz Available online @ www.ijcscn.com without including any snubber circuit. More over, IGBTs are replacing MOSFETs for the several or several tens kilo-watts power range applications since IGBTs can handle higher voltage and power with higher power density and lower cost comparing to MOSFETs. The maximum operating frequency of IGBTs is limited to 20-30 kHz [ 11 because of their current tailing problem. To operate IGBTs at high switching frequencies, it .