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In this paper, two novel control strategies are designed and evaluated for a bidirectional DC/DC converter and a 3-stage parallel-interleaved bidirectional converter, for hybrid electric vehicle (HEV) energy storage applications. The energy storage system (ESS) combines 2 parallel ultra-capacitor (UC) modules with a bidirectional DC/DC converter, a Lithium-Ion (Li-ion) battery module, and a load module...
This paper presents detailed design and comparison of two front-end Dc/Dc converters which are suitable especially for the medium-power level applications with low output voltage and high output current both. Where, the LLC resonant converter drawn more and more attention recently shows its essential advantages in high conversion efficiency and high power density. However, due to the variable-frequency...
A method of maintaining high power-conversion efficiency across the entire load range and its circuit implementations are described. The proposed method substantially increases the conversion efficiency at light loads by minimizing switching and driving losses of semiconductor switches, as well as core losses of magnetic components. These losses are minimized by periodically turning off and on the...
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