基于钳位电路的S-CL-S补偿无线充电系统

Clamp circuit based S-CL-S compensated wireless charging system

摘要

当前,磁耦合无线充电技术已在锂电池充电领域得到广泛应用.针对现有系统存在的控制冗余问题,为提升充电安全性与效率,提出一种基于S-CL-S补偿结构的无线充电系统.该系统在原边引入辅助线圈与二极管整流桥结构,无需外接控制电路及检测系统即可实现输出端恒流-恒压模式(constant-current-constant-voltage,CC-CV)的自主切换.辅助线圈可保证系统输出增益不受磁耦合器参数限制,显著提升了系统设计灵活度.所提系统可在单工作频率下完成CC-CV转换,确保实现逆变器的软开关操作与变换器接近0的无功环流,有效降低器件应力并提高能量传输效率,同时具备自动开路保护功能.最后搭建了一台输出为2.5A/54V的实验样机,验证所提出系统的正确性与可行性.

Abstract

Currently, magnetic coupling wireless charging technology has been extensively adopted for lithium battery charging. To address the control redundancy issues in conventional systems and enhance charging safety and efficiency, this paper proposes an S-CL-S compensated wireless charging system. By integrating an auxiliary coil and diode rectifier bridge at the transmitter side, the system achieves automatic Constant-Current to Constant-Voltage (CC-CV) mode switching at the output terminal without requiring additional control circuits or detection modules. The auxiliary coil effectively decouples the system's output gain from magnetic coupler parameter constraints, thereby significantly enhancing design flexibility. The proposed configuration enables CC-CV conversion at a single operating frequency, reducing device stress and improving energy transfer efficiency through sustained soft-switching operation of the inverter and near-zero reactive circulating current suppression in the converter, while also incorporating inherent open-circuit protection. Experimental validation using a 2.5A/54V prototype confirms the system's effectiveness and feasibility.

关键词

无线电能传输 / 自动开路保护 / 钳位电路 / 恒流恒压切换

Key words

wireless energy transmission / automatic open-circuit protection / clamp circuit / CC-CV transition

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基金资助

国家自然科学基金(61627818)