To address service function chain routing challenges in satellite-terrestrial integrated networks, an attention-enhanced Direct Reward Policy Optimization(DRPO) method is proposed. Simulations show the proposed method achieves higher utility and admission-rate than Greedy with similar delay.
Xuan Wu, Zikang Li, Qi Zhang et al.· International Conference on...· 0 citations
This article proposes a high-power-density flux-split coupled-transformer voltage regulator (FS-CTVR) with improved dynamic response for 48 V data center power supplies. The topology resolves the large winding loss and insufficient dynamic performance of convenitional current Doubler rectifier (CDR) converters. A magnetically integrated transformer with primary flux splitting and secondary parallel current sharing is developed to achieve a high turns ratio, reduce winding footprint and current stress, and mitigate winding losses. Additional PCB winding layers form a common coupling loop for multiphase CDR transformers, which reduces transient output inductance and improves dynamic response. Comprehensive analysis, design and performance evaluation of the FS-CTVR are presented. A two-module parallel prototype (54 V input, 0.9 V output) is built and tested. Each module delivers 150 A full-load current, 88.6% full-load efficiency and 1687 W/in3 power density, with a dynamic voltage fluctuation of 88 mV. Experimental results validate the feasibility and superior performance of the proposed topology.
Yijie Wang, Zikang Li, Jingyang Tan et al.· IEEE transactions on power e...· 0 citations
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