期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 34, 期 1, 页码 378-390出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2812198
关键词
Cuk dual-resonance core (DRC); continuous conversion ratio; resonant switched-capacitor converter (RSC); step-up
资金
- Research Scholarship of One-Cycle Control, Inc.
In this paper, a family of step-up resonant switched-capacitor converters (RSCs) with a continuously adjustable conversion ratio is proposed based on the Cuk dual-resonance core (DRC) featuring two resonant paths. By adopting the on-time fixed frequency modulation, the two resonant paths can conduct simultaneously and satisfy the charge balance of the flying capacitor during the overlapping period. As a result, the conversion ratio-upper bounded by two determined by the circuit configuration-can vary continuously and efficiently even at the light load condition (1/10 of the rated power). A comprehensive analysis-the operation principle, voltage-gain curve, and voltage/current stresses-about the DRC is given. In addition, the Cuk DRC was extended to the series-parallel switched-capacitor converter (SCC), Fibonacci SCC, and voltage doubler to form a family of step-up RSCs, whose voltage-gain curves of different topologies are derived. Moreover, a characteristic comparison between the Cuk DRC and the traditional direct and indirect resonant core is given. Then, a 48 to 62-94.6 V resonant core with peak efficiency 97.8% and maximum power 120 W under the open loop condition was built. The analyses were verified by both experimental and simulation results.
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