摘要
在感应电能传输(IPT)系统中,线圈错位难以避免,造成的耦合变化会导致系统的传输功率不稳定。为了保证IPT系统的供电灵活性,系统需具有容忍线圈宽范围偏移的能力。为此,该文借鉴模态切换的思想,提出一种基于钳位电路的LCC-S补偿型IPT系统,用于增强系统抗偏移性。与传统多模态切换的IPT系统相比,该系统中的钳位电路可根据耦合变化自适应地导通或关断,以调节工作模态,从而实现近乎恒定的功率输出,该方法无需耦合识别、输出检测及反馈通信等辅助手段。该文对系统不同工作模态的功率传输特性进行了推导和分析,并结合系统设计相关约束条件,提供一套参数化设计方法。最后设计并搭建一套500 W的实验装置,验证了理论分析的正确性与可行性。实验结果表明,该方法在耦合度为0.205~0.42的情况下,输出功率稳定在470~505 W之间,效率为83.29%~90.21%。
Inductive power transfer(IPT)technology delivers power through electromagnetic induction between the coupled coils without physical contact.However,the misalignment between coils is often unavoidable in applications,and the coupling variation caused by the misalignment can cause the instability of the IPT system.Therefore,ensuring output stability has become one of the main problems in the application and development of IPT technology.Topology design solutions are favored because of their simplicity and reliability.Topology design solutions include mixed topology,detuning topology,and reconfigurable topology.The reconfigurable topology solution needs to apply active switching devices,the detection module,and the communication module,causing higher costs and lower reliability.Based on the idea of mode switching,this paper proposes a novel detuning IPT system with a clamp circuit to enhance the anti-misalignment ability of the system.Compared with the traditional multi-mode IPT system,the clamp circuit in the system can be switched on or off adaptively according to the coupling variation to adjust the system mode and achieve nearly constant power output without auxiliary equipment,such as coupling identification,output detection,and feedback com-munication.First,according to the characteristics of unidirectional conduction and discontinuous/continuous of the clamp circuit,the proposed system has multi-mode characteristics,and the corresponding system output power curves of different modes are different.The working principle and power output characteristics of the IPT system with or without the clamp circuit activation are derived and analyzed,and the expressions of the system power output curve with or without the clamp circuit activation are given.Feasible splicing methods are proposed based on the corresponding output power curves of different system modes.Then,by analyzing the function of each topology structure of the proposed IPT system and the output power curve of the system under different working modes,reasonable constraint conditions are provided for the parametric design of the system.The feasible parametric design process method is obtained.At the same time,this paper provides a set of methods to judge the system mode according to the time domain analysis method to ensure the accuracy of the switching point,and also gives a design case.By subinterval analysis method,the output characteristics of the IPT converter under the PN and PON modes are analyzed,and the currents of the clamp circuit in different modes are calculated to verify if the clamp circuit is activated.A 500 W experimental prototype is built,and the changes in output power and efficiency during coupling variation are measured.Experimental results show that when the coupling coefficient changes during 0.205~0.42,the output power of the proposed system fluctuates between 470~505 W,the maximum output power fluctuation is 35 W,the output power fluctuation rate is less than 3.6%,and the efficiency changes between 90.21%and 83.29%.
作者
张滨山
张泽恒
杨斌
麦瑞坤
陈阳
Zhang Binshan;Zhang Zeheng;Yang Bin;Mai Ruikun;Chen Yang(Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education Southwest Jiaotong University,Chengdu 611756 China;School of Electrical Engineering Southwest Jiaotong University,Chengdu 611756 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第8期2388-2399,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(52207226)
四川省科技计划(2023NSFSC0819,2023JDRC0102)。
