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Huakun Bi,Ping Wang,Yanbo Che 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5
To match the dynamic lower voltage of a fuel cell stack and the required constant higher voltage (400V) of a DC bus, an H-type structural Boost three-level DC-DC converter with a wide voltage-gain range (HS-BTL) is presented in this paper. When compared with the traditional flying-capacitor Boost three-level DC-DC converter, the proposed converter can obtain a higher voltage-gain and does not require a complicate control for the flying-capacitor voltage balance. Moreover, the proposed converter, which can draw a continuous and low-rippled current from an input source, has the advantages of a wide voltage-gain range and low voltage stress for power semiconductors. The operating principle, parameters design and a comparison with other converters are presented and analyzed. Experimental results are also given to verify the aforementioned characteristics and theoretical analysis. The proposed converter is suitable for application of fuel cell systems.
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Bi, Huakun,Wang, Ping,Che, Yanbo The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.5
To match the dynamic lower voltage of a fuel cell stack and the required constant higher voltage (400V) of a DC bus, an H-type structural Boost three-level DC-DC converter with a wide voltage-gain range (HS-BTL) is presented in this paper. When compared with the traditional flying-capacitor Boost three-level DC-DC converter, the proposed converter can obtain a higher voltage-gain and does not require a complicate control for the flying-capacitor voltage balance. Moreover, the proposed converter, which can draw a continuous and low-rippled current from an input source, has the advantages of a wide voltage-gain range and low voltage stress for power semiconductors. The operating principle, parameters design and a comparison with other converters are presented and analyzed. Experimental results are also given to verify the aforementioned characteristics and theoretical analysis. The proposed converter is suitable for application of fuel cell systems.
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皮华坤(Huakun Pi),吕元平(Yuanping Lv) YIXIN 출판사 2023 Journal of China Studies Vol.1 No.4
城乡融合关注城市与乡村的协同发展,可持续发展关注以人为本和生态建设,城乡融合和可持续发展密切相关、互相促进。基于云南省地州产业发展实践,建构城乡融合可持续发展“产业-科技-环境”体系,从城乡产业高度融合、城市科技持续下乡和城乡双重环境改善三个方面阐述城乡融合可持续发展。在城乡融合可持续发展的现实路径上,以城乡要素流动、数字技术发展和乡村发展转型为重点。城乡融合可持续发展对乡村社会变迁具有重要意义,乡村发展为城乡融合可持续发展创造了有利条件。 Urban rural integration focuses on the coordinated development of urban and rural areas, while sustainable development focuses on people-oriented and ecological construction. Urban rural integration and sustainable development are closely related and mutually reinforcing. Based on the practice of industrial development in Yunnan Province’s prefectures, an “industry technology environment” system for sustainable urban-rural integration is constructed, which elaborates on three aspects: high integration of urban-rural industries, continuous promotion of urban technology to rural areas, and improvement of the dual environment between urban and rural areas. On the practical path of sustainable development through urban-rural integration, the focus is on the flow of urban-rural factors, the development of digital technology, and the transformation of rural development. The sustainable development of urban-rural integration is of great significance to rural social changes, and rural development has created favorable conditions for the sustainable development of urban-rural integration.
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Wang, Zhishuang,Wang, Ping,Bi, Huakun,Qiu, Mingjie The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
In this paper, a bidirectional non-isolated DC/DC converter for hybrid energy storage systems has been proposed. The converter is constituted by the integration of two conventional two-level topologies, with a parallel connection on their low-voltage sides (LVSs) and a series connection on their high-voltage sides (HVSs). Thus, a high-voltage gain can be achieved, along with the low-voltage stresses on power switches and capacitors. In addition, by establishing a higher charging/discharging voltage in the step-up/down mode on the inductor, the voltage gain range can be further extended. Furthermore, the operating principles, characteristics analysis, and comparisons with other converters are presented in detail. Finally, a 400 W prototype has been fabricated to further validate the feasibility and correctness of the theoretical analyses. The LVS voltage range is 20-60 V, while the HVS voltage is 200 V. The resulting voltage gain range is from 3.34 to 10. Moreover, the converter achieves high efficiency in bidirectional operations. The maximum efficiencies are 95.7% in the step-up mode and 95.9% in the step-down mode.
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Suk Ryu, Ho,Seon Kim, Jong,Guo, Zaiping,Liu, Huakun,Won Kim, Ki,Hyeon Ahn, Jou,Jun Ahn, Hyo Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P> Fe<SUB>2</SUB>O<SUB>3</SUB> thin films are important for the fabrication of rechargeable lithium microbatteries. Thin films of Fe<SUB>2</SUB>O<SUB>3</SUB> were prepared by the electrostatic spray deposition (ESD) technique by using iron chloride as the precursor. The thin film electrodes, without inert additives such as polymer binder and conducting material, can deliver a first discharge capacity of 912 mA h g<SUP>−1</SUP> and retain a discharge capacity of 537 mA h g<SUP>−1</SUP> at a current density of 200 mA g<SUP>−1</SUP> to the 100th cycle. The coulombic efficiency of the Fe<SUB>2</SUB>O<SUB>3</SUB> thin-film electrode was over 96% after several cycles.</P>
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