Abstract
Notice of Violation of IEEE Publication Principles <br><br>"Hybrid Control Strategy Dual-Resonance-Core Based Step-Up/Down Switched Capacitor Converter with Reduced Frequency Range for Wide Output Voltage Application" <br> by Zhangyong Chen, Yubo Han, Yunfeng Wu, Zhengdong Lu, Xiangyu Liu and Changhua Zhang, <br>in the IEEE Transactions on Power Electronics, Early Access <br><br>After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE’s Publication Principles. <br><br>This paper contains copied and improperly cited content from the paper cited below. <br>"Dual Resonant Switched-Capacitor Step-Down Polarity Inverter" <br> by Benjamin Y. Brown, Keyue Ma Smedley, <br>in a MS Thesis, University of California, Irvine, 2019 <br><br> <br/> Wide voltage range converters are significant for photovoltaic power generation system, battery charging, etc. Resonant converter has been preferred topology for these applications, however, some demerits exist: 1) Difficult to realize wide voltage gain range and low circulating current losses; 2) Widely regulated switching frequency to adapt to wide voltage gain range; 3) Poor regulation at light load. Based on above-mentioned shortcomings, dual-resonance-core based step-up/down switched capacitor converter topology is presented in this paper. Utilizing hybrid control strategy, non-overlapping control strategy is used in the Buck-type mode and overlapping control strategy is applied in the Boost-type mode with common switching frequency range, and therefore, reduced frequency range in the presented converter is achieved. Moreover, wide voltage gain range can be obtained due to step-up/down capacity in the proposed converter. Furthermore, conversion ratio of proposed converter can be reduced to zero theoretically by using dual-resonance-core existed in the resonant switched capacitor converter. Finally, comprehensive operational principle analysis and performance analysis are provided, and a 48V to 2890V/100W prototype is built to verify the analysis.
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