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This paper presents steady-state analysis and design of current-fed full-bridge dc/dc converter with active-clamp. The converter utilizes the energy stored in the transformer leakage, aided by its magnetizing inductance to maintain zero-voltage- switching of H-bridge switches over wide range of input voltage and load variation. Active-clamp clamps the voltage across the switches at turn-off, allowing the selection and use of low voltage devices with low on-state resistance. In addition, this small and low rating active-clamp circuit results in zero-voltage transition circuit aiding in achieving zero voltage switching of the devices. All switches undergo soft turn-on and switching losses of the converter are reduced. It improves the converter efficiency and allows high switching frequency operation, which results in compact, light weight, and low cost system.
Date of Conference: 5-8 Dec. 2011