非对称线圈谐振式无线充电系统的设计与研究
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摘要
动物机器人神经刺激器使用微型电池供电,较小的电池容量限制了刺激器的工作时长,为能使刺激器持续工作,文中提出一种基于无线充电的供电方案。为减小接收线圈的重量和尺寸对动物运动的影响,需要选择较小的尺寸,同时要保障足够的传输功率,因此提出并设计了基于非对称谐振线圈的无线充电方案。首先,基于电路理论和无线电能传输系统的电路模型,分析无线电能传输系统传输特性;然后,基于Matlab分析线圈匝数和线圈半径对传输性能的影响,并通过HFSS探明了非对称谐振线圈情况下传输距离与磁场的空间分布的关系;最后,建立一套基于磁耦合谐振的非对称无线电能传输实验平台,并进行实验验证。实验结果表明,理论数据、模拟数据和实验数据吻合较好,此方案既能满足接收线圈尺寸小的要求,又能抑制频率分裂,提高传输功率和效率,完全适用于动物机器人神经刺激器的无线电能传输。
The nerve stimulator of the animal robot is powered by the micro-battery,and the small capacity of the battery limits the working time of the stimulator. Therefore,a power supply scheme based on wireless charging is proposed in this paper to make the stimulator work continuously. Since it is necessary to select a small size receiving coil to reduce the influence of the weight and size of the receiving coil on animal motion,and sufficient transmission power needs to be ensured,a wireless power charging scheme based on the asymmetric resonant coil is proposed and designed. The transmission features of the wireless power energy transmission system are analyzed based on the circuit theory and circuit model of the wireless power energy transmission system. The influences of coil turns and radius on the transmission performance are analyzed with the Matlab. The relationship between the transmission distance and the spatial distribution of the magnetic field in the case of asymmetric resonant coil is explored by using the HFSS. An asymmetric wireless power energy transmission experimental platform based on the magnetic coupling resonance is established,and verified by the experiment. The experimental results show that the theoretical data,simulation data and experimental data are in good agreement;the scheme can not only meet the small size receiving coil requirement,but also suppress frequency splitting and improve the transmission power and efficiency,which is fully applicable to the wireless power energy transmission for the nerve stimulator of the animal robot.
The nerve stimulator of the animal robot is powered by the micro-battery,and the small capacity of the battery limits the working time of the stimulator. Therefore,a power supply scheme based on wireless charging is proposed in this paper to make the stimulator work continuously. Since it is necessary to select a small size receiving coil to reduce the influence of the weight and size of the receiving coil on animal motion,and sufficient transmission power needs to be ensured,a wireless power charging scheme based on the asymmetric resonant coil is proposed and designed. The transmission features of the wireless power energy transmission system are analyzed based on the circuit theory and circuit model of the wireless power energy transmission system. The influences of coil turns and radius on the transmission performance are analyzed with the Matlab. The relationship between the transmission distance and the spatial distribution of the magnetic field in the case of asymmetric resonant coil is explored by using the HFSS. An asymmetric wireless power energy transmission experimental platform based on the magnetic coupling resonance is established,and verified by the experiment. The experimental results show that the theoretical data,simulation data and experimental data are in good agreement;the scheme can not only meet the small size receiving coil requirement,but also suppress frequency splitting and improve the transmission power and efficiency,which is fully applicable to the wireless power energy transmission for the nerve stimulator of the animal robot.
引文
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[2]李中启,黄守道,易吉良,等.磁耦合谐振式无线电能传输系统频率分裂抑制方法[J].电力系统自动化,2017,41(2):21-27.LI Zhongqi,HUANG Shoudao,YI Jiliang,et al. A method of preventing frequency splitting in magnetic coupling resonant wireless power transfer system[J]. Automation of electric power systems,2017,41(2):21-27.
[3]安慧林,李艳红,刘国强,等.具有频率跟踪的谐振式无线电能传输技术研究[J].电器与能效管理技术,2017(2):44-48.AN Huilin,LI Yanhong,LIU Guoqiang,et al. Research of wireless power transmission technology via resonance with frequency tracking[J]. Electrical&energy management technology,2017(2):44-48.
[4] DUONG T P,LEE J W. Experimental results of high-efficiency resonant coupling wireless power transfer using a variable coupling method[J]. IEEE microwave and wireless components letters,2011,21(8):442-444.
[5] PARK J,TAK Y,KIM Y,et al. Investigation of adaptive matching methods for near-field wireless power transfer[J].IEEE transactions on antennas and propagation,2011,59(5):1769-1773.
[6] LEE W S,SON W I,OH K S,et al. Contactless energy transfer systems using antiparallel resonant loops[J]. IEEE transactions on industrial electronics,2013,60(1):350-359.
[7]王玉阳,姚丽,韦静.基于HFSS的瞬变电磁法发射线圈参数的仿真分析[J].现代电子技术,2013,36(5):157-160.WANG Yuyang,YAO Li,WEI Jing. Simulation and analysis of parameters of transient electromagnet transmitting coil with HFSS[J]. Modern electronics technique,2013,36(5):157-160.
[8]赵争鸣,张艺明,陈凯楠.磁耦合谐振式无线电能传输技术的新进展[J].中国电机工程学报,2013,33(3):1-13.ZHAO Zhengming,ZHANG Yiming,CHEN Kainan. New progress of magnetically-coupled resonant wireless power transfer technology[J]. Proceedings of the CSEE,2013,33(3):1-13.
[9]陈希有,周宇翔,李冠林,等.磁场耦合无线电能传输系统最大功率要素分析[J].电机与控制学报,2017,21(3):1-9.CHEN Xiyou,ZHOU Yuxiang,LI Guanlin,et al. Approach for maximum power transfer of magnetically coupled wireless power transmission system[J]. Electric machines and control,2017,21(3):1-9.
[10] KIM N Y,KIM K Y,KIM C W. Automated frequency tracking system for efficient mid-range magnetic resonance wireless power transfer[J]. Microwave and optical technology letters,2012,54(6):1423-1426.