一种可产生均匀磁场的并联发射线圈结构
|
摘要
提出了一种新型发射线圈设计方案。发射线圈以中心点为基准均匀排布,内部所有单圈线圈并联,在线圈中加入特定比例的电容,使得每圈上流过的电流成一定比例,最终使得这些电流产生的叠加磁场的法向分量分布均匀。该设计方案可产生均匀磁场,使接收线圈在磁场分布区域内有较高的自由度,同时能稳定接收端的接收功率和效率。实验中,通过比较接收线圈在发射线圈正上方5mm垂直高度处的感应峰峰值波动性来评价磁场均匀性,结果发现,新型方案测试数据的标准差为9.76,传统方案测试数据的标准差为43.31。仿真结果与实验结果吻合,均表明,相比于传统发射线圈,新型发射线圈有效改善了磁场的均匀性。
A new type of transmitting coil is proposed,in which the turns of the coil are connected in parallel,and the current of each turn is determined by the added capacitance connected with each turn in series.The transmitting coil provides an uniform magnetic field.The receiving coil has a wider region where the receiving coil has the stable received power and efficiency.In the experiments,the uniformity of the magnetic field is evaluated by comparing the peak value of induced voltage of the receiving coil which is located at 5 mm height above the transmitting coil.The experimental results show that the standard deviation of the new design is 9.76,and the standard deviation of the traditional one is 43.31.The simulation results are in good agreement with the experimental results.It is shown that the new transmitting coil design can improve the uniformity of the magnetic field which is better than the traditional transmitting coil design.
A new type of transmitting coil is proposed,in which the turns of the coil are connected in parallel,and the current of each turn is determined by the added capacitance connected with each turn in series.The transmitting coil provides an uniform magnetic field.The receiving coil has a wider region where the receiving coil has the stable received power and efficiency.In the experiments,the uniformity of the magnetic field is evaluated by comparing the peak value of induced voltage of the receiving coil which is located at 5 mm height above the transmitting coil.The experimental results show that the standard deviation of the new design is 9.76,and the standard deviation of the traditional one is 43.31.The simulation results are in good agreement with the experimental results.It is shown that the new transmitting coil design can improve the uniformity of the magnetic field which is better than the traditional transmitting coil design.
引文
[1]KURS A,KARALIS A,MOFFATT R,et al.Wireless power transfer via strongly coupled magnetic resonances[J].Science,2007,317(5834):83-86.
[2]ZARGHAM M,GULAK P G.Maximum achievable efficiency in near-field coupled power-transfer systems[J].IEEE Transactions on Biomedical Circuits and Systems,2012,6(3):228-245.
[3]CHENG Y,SHU Y.A new analytical calculation of the mutual inductance of the coaxial spiral rectangular coils[J].IEEE Transactions on Magnetics,2014,50(4):1-6.
[4]CHENG Y,SHU Y.Mutual inductance calculation between arbitrarily positioned rectangular filaments[J].International Journal of Applied Electromagnetics and Mechanics,2014,46(1):287-298.
[5]CASANOVA J J,ZHEN N L,LIN J.A loosely coupled planar wireless power system for multiple receivers[J].IEEE Transactions on Industrial Electronics,2009,56(8):3060-3068.
[6]JOW U M,GHOVANLOO M.Geometrical design of a scalable overlapping planar spiral coil array to generate a homogeneous magnetic field[J].IEEE Transactions on Magnetics,2013,49(6):2933-2945.
[7]LIU X,HUI S Y.Optimal design of a hybrid winding structure for planar contactless battery charging platform[J].IEEE Transactions on Power Electronics,2008,23(1):455-463.
[8]CASANOVA J J,LOW Z N,LIN J,et al.Transmitting coil achieving uniform magnetic field distribution for planar wireless power transfer system[C]//Radio and Wireless Symposium,2009.RWS'09.IEEE.IEEE,2009:530-533.
[9]DIAO Y,SHEN Y,GAO Y.Design of coil structure achieving uniform magnetic field distribution for wireless charging platform[C]//International Conference on Power Electronics Systems and Applications.IEEE,2011:1-5.
[10]CONWAY J T.Exact solutions for the magnetic fields of axisymmetric solenoids and current distributions[J].IEEE Transactions on Magnetics,2001,37(4):2977-2988.
[11]CHENG Y,CHEN G,QIAN G,et al.Optimizing three-phase three-layer coil array for omnidirectional wireless power transfer[C]//Wireless Power Transfer Conference(WPTC),2017IEEE.IEEE,2017:1-3.
[12]SERRANO J,ACERO J,LOPE I,et al.Calculation of losses in PCB windings for multi-coil contactless charging systems[C]//Applied Power Electronics Conference and Exposition(APEC),2016IEEE.IEEE,2016:3020-3025.
[13]CHENG Y,SU X,XUAN D,et al.Modeling and optimization of single-turn printed coils for powering biomedical implants[C]//Wireless Power Transfer Conference(WPTC),2017IEEE.IEEE,2017:1-3.
[14]KIANI M,JOW U M,GHOVANLOO M.Design and optimization of a 3-coil inductive link for efficient wireless power transmission[J].IEEE Transactions on Biomedical Circuits and Systems,2011,5(6):579-591.
[15]SHEN L,TANG W,XIANG H,et al.Uniform magnetic field by changing the current distribution on the planar coil for displacement-insensitive wireless power transfer/near field communication[J].Microwave and Optical Technology Letters,2015,57(2):424-427.
[16]PETER A K,CHRISTOPHER C,GEORG B,et al.PCB coil design producing a uniform confined magnetic field[J].IEEE Magnetics Letters,2017(8):1306205.
[17]郑辛,王春娥,秦杰,等.一种磁屏蔽环境下的高均匀区磁场线圈设计方法:201510738130.x[P].2015-11-03[2017-09-08].
[18]WAFFENSCHMIDT E.Homogeneous magnetic coupling for free positioning in an inductive wireless power system[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(1):226-233.
[2]ZARGHAM M,GULAK P G.Maximum achievable efficiency in near-field coupled power-transfer systems[J].IEEE Transactions on Biomedical Circuits and Systems,2012,6(3):228-245.
[3]CHENG Y,SHU Y.A new analytical calculation of the mutual inductance of the coaxial spiral rectangular coils[J].IEEE Transactions on Magnetics,2014,50(4):1-6.
[4]CHENG Y,SHU Y.Mutual inductance calculation between arbitrarily positioned rectangular filaments[J].International Journal of Applied Electromagnetics and Mechanics,2014,46(1):287-298.
[5]CASANOVA J J,ZHEN N L,LIN J.A loosely coupled planar wireless power system for multiple receivers[J].IEEE Transactions on Industrial Electronics,2009,56(8):3060-3068.
[6]JOW U M,GHOVANLOO M.Geometrical design of a scalable overlapping planar spiral coil array to generate a homogeneous magnetic field[J].IEEE Transactions on Magnetics,2013,49(6):2933-2945.
[7]LIU X,HUI S Y.Optimal design of a hybrid winding structure for planar contactless battery charging platform[J].IEEE Transactions on Power Electronics,2008,23(1):455-463.
[8]CASANOVA J J,LOW Z N,LIN J,et al.Transmitting coil achieving uniform magnetic field distribution for planar wireless power transfer system[C]//Radio and Wireless Symposium,2009.RWS'09.IEEE.IEEE,2009:530-533.
[9]DIAO Y,SHEN Y,GAO Y.Design of coil structure achieving uniform magnetic field distribution for wireless charging platform[C]//International Conference on Power Electronics Systems and Applications.IEEE,2011:1-5.
[10]CONWAY J T.Exact solutions for the magnetic fields of axisymmetric solenoids and current distributions[J].IEEE Transactions on Magnetics,2001,37(4):2977-2988.
[11]CHENG Y,CHEN G,QIAN G,et al.Optimizing three-phase three-layer coil array for omnidirectional wireless power transfer[C]//Wireless Power Transfer Conference(WPTC),2017IEEE.IEEE,2017:1-3.
[12]SERRANO J,ACERO J,LOPE I,et al.Calculation of losses in PCB windings for multi-coil contactless charging systems[C]//Applied Power Electronics Conference and Exposition(APEC),2016IEEE.IEEE,2016:3020-3025.
[13]CHENG Y,SU X,XUAN D,et al.Modeling and optimization of single-turn printed coils for powering biomedical implants[C]//Wireless Power Transfer Conference(WPTC),2017IEEE.IEEE,2017:1-3.
[14]KIANI M,JOW U M,GHOVANLOO M.Design and optimization of a 3-coil inductive link for efficient wireless power transmission[J].IEEE Transactions on Biomedical Circuits and Systems,2011,5(6):579-591.
[15]SHEN L,TANG W,XIANG H,et al.Uniform magnetic field by changing the current distribution on the planar coil for displacement-insensitive wireless power transfer/near field communication[J].Microwave and Optical Technology Letters,2015,57(2):424-427.
[16]PETER A K,CHRISTOPHER C,GEORG B,et al.PCB coil design producing a uniform confined magnetic field[J].IEEE Magnetics Letters,2017(8):1306205.
[17]郑辛,王春娥,秦杰,等.一种磁屏蔽环境下的高均匀区磁场线圈设计方法:201510738130.x[P].2015-11-03[2017-09-08].
[18]WAFFENSCHMIDT E.Homogeneous magnetic coupling for free positioning in an inductive wireless power system[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(1):226-233.