Optimization of Minimum Negative Current BCM Synchronous Buck Converter

Tang, Yu, Zhang, Chong, Guo, Yingjun, Sun, Hexu and Jiang, Lin ORCID: 0000-0001-6531-2791
(2022) Optimization of Minimum Negative Current BCM Synchronous Buck Converter. IEEE Transactions on Industrial Electronics, 70 (9). pp. 1-7.

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Nonisolated dc-dc converters are widely used in renewable energy applications, such as the hybrid energy storage system, charging and discharging system of batteries and supercapacitors, and the photovoltaic power generation. With the advantages of achieving zero-voltage switching (ZVS), high efficiency and power density, low cost, and fast dynamic response, the converters operating in boundary current mode (BCM) have caught researchers' eyes recently. Taking the synchronous buck converters as an example, in this letter, we briefly introduce the working principle, and the advantages of BCM converter realize soft switching. First, it is pointed out that the phenomenon of circulating energy exists in the BCM converter. Then, the relationship between the circulating energy and negative current is analyzed, and an optimal control strategy of negative current minimization is proposed to reduce the circulating energy. In the condition of realizing ZVS, negative current minimization not only improves the efficiency of the converter but also reduces the ripple of inductor current to a certain extent. Finally, the experimental platform of 100 W synchronous buck converter is built. Experimental results validate that the optimal control of minimum negative current has good effect on improving efficiency of converter and reducing the ripple of inductor current.

Item Type: Article
Additional Information: (c) 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords: Inductors, Switches, Buck converters, Zero voltage switching, Soft switching, Optimization, Topology, Boundary current mode (BCM), circulating energy, minimum negative current optimization, soft- switching
Depositing User: Symplectic Admin
Date Deposited: 16 Nov 2022 11:15
Last Modified: 02 Jun 2023 11:23
DOI: 10.1109/tie.2022.3210535
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3166224