A Natural Bidirectional Input-Series-Output-Parallel LLC-DCX Converter With Automatic Power Sharing and Power Limitation Capability for Li-Ion Battery Formation and Grading System
发布时间：2021-07-28
点击次数：
影响因子：4.472
DOI码：10.1109/JESTPE.2019.2941583
发表刊物：IEEE Journal of Emerging and Selected Topics in Power Electronics
关键字：Resonant converters; Topology; Pulse width modulation; Bidirectional power flow; Rectifiers; Clamps; Constant power limitation; constant voltage gain; isolated bidirectional dc– dc converter; natural bidirectional power flow
摘要：For the high-power Li-ion battery (LIB) formation and grading system, using a multistage conversion structure, an isolated bidirectional dc-dc converter with a high input voltage, and a large output current is needed to achieve isolation and a relatively fixed voltage conversion gain. This article proposes a modulation strategy and modifies the topology to achieve natural bidirectional power transfer, automatic power sharing, and power limitation for an input-series-output-parallel (ISOP) LLC-DC transformer (DCX) converter. First, an active pulsewidth modulation (PWM) strategy is proposed to avoid synchronous rectifier (SR) sensing and to achieve the natural bidirectional power flow for each submodule. The resonant current always keeps discontinuous, and the conversion gain can keep constant if ignoring the conductive resistance. Second, clamping diodes are added in the conventional LLC converter to limit the inrush current during startup, and to achieve a constant power limitation under an overload condition. Third, with the proposed modulation, the power sharing of the two-module ISOP LLC converter is analyzed and compared with the conventional ISOP LLC converter. Finally, experiments based on an 8-kW (output: 15 V/533 A) prototype composed of the two-module ISOP LLC converter are conducted to verify the effectiveness of the proposed solution.
合写作者：Xie, Shiming, Han, Hua, Su, Mei, Sun, Yao, Wang, Hui, Liu, Yonglu, Xiong, Wenjing
第一作者：Chen, Xiaoying
论文类型：期刊论文
通讯作者：Xu, Guo
论文编号：20115052
学科门类：工学
一级学科：电气工程
卷号：8
期号：4
页面范围：3618-3632
ISSN号：2168-6777
是否译文：否
发表时间：2020-12-01
收录刊物：EI、SCI
附件：