自适应谐振式无线充电性能评估与优先级判断

发布时间：2018-07-27 14:50

【摘要】：随着电力电子技术的发展,便携式电子产品的耗电速度越来越快。在电池本身技术短期内无法取得重大突破的前提下,无线充电技术成为一种可行且便利的解决方式。目前,电磁感应式和谐振式无线充电受到广泛关注。相比于前者,电磁谐振式不仅可以进行中短距离的充电,还能支持多个设备同时充电,且充电功率也有很大提升。首先对谐振式无线充电系统进行了研究。分析了无线充电系统构成和工作原理,讨论了能量在传输过程中应该遵循的规则,并建立了谐振式无线充电数学模型。其次,分析了谐振式无线充电系统,发现在临界耦合点时充电效率最高。紧接着,针对不同电子设备同时充电的场景,提出了一种自适应的谐振式无线充电方法,即发射端可以根据不同接收端电子设备的实际充电需求,如充电距离、残余电量、功率等,对其进行有顺序的充电。进而研究了充电距离与效率之间的关系。分析结果表明,本文所提的方法可以使同时充电更加地灵活便利。不仅如此,在所提出的自适应谐振式无线充电方法的基础上,还提出一种针对多设备同时充电的场景下基于多参数的无线充电优先级算法,以实现更优的充电系统效率。该算法涉及的性能参数包括:电池容量、实时残余电量、实时充电距离、负载,以及用户对充电优先的主观系数等。仿真结果表明,相比于无优先级无线充电过程,该算法可以大大地提高充电效率。此外,对系统性能参数研究的基础上提出了线圈天线的性能评估流程,根据性能参数评估标准和二端口网络分析设计了一种适用于谐振式无线充电的线圈天线。通过电磁仿真软件HFSS对设计的线圈天线进行3D建模,研究了模型的性能参数,包括线圈天线的S参数、驻波比、充电效率和3D电磁场分布图,得出线圈天线在中心频率2.8GHz处发生谐振,输入回波损耗最小,为-29.11dB,且充电效率可达到84.15%。在加入优先级公式后此线圈天线的充电效率高达92.37%,且使整个系统充电稳定。此外,经过性能评估后设计的线圈天线具有成本低、结构简单等优势,因此该设计对无线充电的研究有很好的借鉴作用。
[Abstract]:With the development of power electronics technology, the power consumption of portable electronic products is getting faster and faster. Wireless charging technology has become a feasible and convenient solution under the premise that the battery itself can not make a major breakthrough in the short term. At present, electromagnetic induction and resonant wireless charging have received wide attention. Compared with the former, the electromagnetic resonance not only can be used for short and medium distance charging, but also can support multiple devices to charge simultaneously, and the charging power is also greatly improved. First, the resonant wireless charging system is studied. The constitution and working principle of wireless charging system are analyzed, the rules of energy transmission are discussed, and the mathematical model of resonant wireless charging is established. Secondly, the resonant wireless charging system is analyzed and it is found that the charging efficiency is the highest at the critical coupling point. Then, an adaptive resonant wireless charging method is proposed for different electronic devices to charge at the same time, that is, the transmitter can charge according to the actual charging requirements of different electronic devices, such as charging distance, residual charge. Power, etc., for sequential charging. Furthermore, the relationship between charging distance and efficiency is studied. The results show that the proposed method can make simultaneous charging more flexible and convenient. Moreover, on the basis of the proposed adaptive resonant wireless charging method, a multi-parameter wireless charging priority algorithm is proposed to achieve better charging system efficiency. The performance parameters of the algorithm include battery capacity, real-time residual power, real-time charging distance, load, and user's subjective coefficient of charging priority. The simulation results show that the proposed algorithm can greatly improve the charging efficiency compared with the non-priority wireless charging process. In addition, based on the research of the system performance parameters, the performance evaluation flow of the coil antenna is proposed. According to the performance parameter evaluation standard and the two-port network analysis, a coil antenna suitable for resonant wireless charging is designed. The 3D modeling of the designed coil antenna is carried out by the electromagnetic simulation software HFSS, and the performance parameters of the model are studied, including S parameter, standing wave ratio, charging efficiency and 3D electromagnetic field distribution of the coil antenna. It is concluded that the coil antenna resonates at the center frequency 2.8GHz, and the input echo loss is minimum, which is -29.11 dB, and the charging efficiency can reach 84.15 dB. After the priority formula is added, the charging efficiency of the coil antenna is up to 92.37, and the charge stability of the whole system is achieved. In addition, the coil antenna designed after performance evaluation has the advantages of low cost and simple structure, so the design can be used for reference in the research of wireless charging.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM910.6

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