Abstract:Capacitive power transfer is a rapidly developing technology. It is more economical, reliable, and safer than inductive power transfer, and can be widely used in environments that have many metal structures. Since capacitive power transfer uses high frequency electric field to transfer power, there are high frequency voltages stressed on coupled plates. Also, voltages will be induced on the surface of the applications such as electric vehicle, it is a serious problem for safety concern. To solve this problem, this paper proposes a static power transmission system optimization strategy based on capacitive power transfer system to reduce the voltage on the shell of a car. The CLL compensation structure is used and optimized to resonant system. A 1.3kW output power system with the optimization strategy is built to verify the analysis results. The efficiency of the prototype reaches 87.7%. With the optimization method, the effective voltage of the experiment shell is 3.88V which agrees with the calculation results.
郭历谋, 罗博, 麦瑞坤. 基于电场耦合式的电动汽车无线充电技术电压优化方法[J]. 电工技术学报, 2020, 35(zk1): 19-27.
Guo Limou, Luo Bo, Mai Ruikun. Voltage Optimization Method for Wireless Charging of Electric Vehicles Based on Capacitive Power Transfer. Transactions of China Electrotechnical Society, 2020, 35(zk1): 19-27.
[1] 罗博, 陈丽华, 李勇, 等. 基于滑模控制的感应耦合电能传输系统输出电压控制研究[J]. 电工技术学报, 2017, 32(23): 235-242. Luo Bo, Chen Lihua, Li Yong, et al.Investigation of output voltage control for the inductive power transfer system based on sliding mode control theory[J]. Transactions of China Electrotechnical Society, 2017, 32(23): 235-242. [2] 赵争鸣, 刘方, 陈凯楠. 电动汽车无线充电技术研究综述[J]. 电工技术学报, 2016, 31(20): 30-40. Zhao Zhengming, Liu Fang, Chen Kainan.New progress of wireless charging technology for electric vehicles[J]. Transactions of China Electrotechnical Society, 2016, 31(20): 30-40. [3] 苏玉刚, 赵鱼名, 谢诗云, 等. 电场耦合无线电能传输系统负载软切换控制技术[J]. 电工技术学报, 2017, 32(18): 44-51. Su Yugang, Zhao Yuming, Xie Shiyun, et al.Control of load soft-switched for electric-field coupled power transfer system[J]. Transactions of China Electro- technical Society, 2017, 32(18): 44-51. [4] 麦瑞坤, 李勇, 何正友, 等. 无线电能传输技术及其在轨道交通中研究进展[J]. 西南交通大学学报, 2016, 51(3): 446-461. Mai Ruikun, Li Yong, He Zhengyou, et al.Wireless power transfer technology and its research progress in rail transportation[J]. Journal of Southwest Jiaotong University, 2016, 51(3): 446-461. [5] 耿宇宇, 杨中平, 林飞, 等. 基于多接收耦合线圈模式的无线电能传输系统特性分析[J]. 电工技术学报, 2017, 32(增刊2): 1-9. Geng Yuyu, Yang Zhongping, Lin Fei, et al.Charac- teristic analysis of multiple-receiving coupling coils mode for wireless power transfer systems[J]. Transactions of China Electrotechnical Society, 2017, 32(S2): 1-9. [6] Lu Fei, Zhang Hua, Hofmann H, et al.A double- sided LCLC-compensated capacitive power transfer system for electric vehicle charging[J]. IEEE Transactions on Power Electronics, 2015, 30(11): 6011-6014. [7] Li Siqi, Li Weihan, Deng Junjun, et al.A double- sided LCC compensation network and its tuning method for wireless power transfer[J]. IEEE Transa- ctions on Vehicular Technology, 2015, 64(6): 2261-2273. [8] Lu Fei, Hofmann H, Deng Junjun, et al.Output power and efficiency sensitivity to circuit parameter variations in double-sided LCC-compensated wireless power transfer system[C]//IEEE Applied Power Elec- tronics Conference and Exposition, Charlotte, 2015: 597-601. [9] Deng Junjun, Lu Fei, Li Siqi, et al.Development of a high efficiency primary side controlled 7kW wireless power charger[C]//IEEE Electric Vehicle Conference, Florence, 2015: 1-6. [10] Dai Xin, Li Xiaofei, Li Yanling, et al.Maximum efficiency tracking for wireless power transfer systems with dynamic coupling coefficient estima- tion[J]. IEEE Transactions on Power Electronics, 2018, 33(6): 5005-5015. [11] Zhang Hua, Lu Fei, Hofmann H, et al.An LC compensated electric field repeater for long distance capacitive power transfer[J]. IEEE Transactions on Industry Applications, 2017, 53(5): 4914-4922. [12] 苏玉刚, 徐健, 谢诗云, 等. 电场耦合型无线电能传输系统调谐技术[J]. 电工技术学报, 2013, 28(11): 189-194. Su Yugang, Xu Jian, Xie Shiyun, et al.A tuning technology of electrical-field coupled wireless power transfer system[J]. Transactions of China Electro- technical Society, 2013, 28(11): 189-194. [13] Sun Yue, Zhang Huan, Hu A P, et al.The recognition and control of nonideal soft-switching frequency for wireless power transfer system based on waveform identification[J]. IEEE Transactions on Power Electronics, 2017, 32(8): 6617-6627. [14] Zhang Hua, Lu Fei, Hofmann H, et al.A 4-plate compact capacitive coupler design and LCL- compensated topology for capacitive power transfer in electric vehicle charging applications[J]. IEEE Transactions on Power Electronics, 2016, 31(12): 8541-8551. [15] 陈阳琦, 陈丽华, 罗博, 等. 一种电场耦合式无线电能传输系统无源谐振元件电压优化方法[J]. 电工技术学报, 2018, 33(10): 2237-2244. Chen Yangqi, Chen Lihua, Luo Bo, et al.Voltage optimization method of passive resonant elements in electric field coupled power transmission system[J]. Transactions of China Electrotechnical Society, 2018, 33(10): 2237-2244. [16] Zhang Hua, Lu Fei, Hofmann H, et al.A six-plate capacitive coupler to reduce electric field emission in large air-gap capacitive power transfer[J]. IEEE Transa- ctions on Power Electronics, 2018, 33(1): 665-675. [17] Lu Fei, Zhang Hua, Hofmann H, et al.A CLLC- compensated high power and large air-gap capacitive power transfer system for electric vehicle charging applications[C]//2016 IEEE Applied Power Electro- nics Conference and Exposition (APEC), Long Beach, 2016: 1721-1725. [18] Stewart J.Calculus[M]. Chicago, US: World Book Inc, 2004. [19] IEEE standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3kHzto 300GHz amendment 1: specifies ceiling limits for induced and contact current, clarifies distinctions between localized exposure and spatial[S]. IEEE Std C95.1a, 2010: 1-9. [20] Liu Chao, Hu A P, Wang B, et al.A capacitively coupled contactless matrix charging platform with soft switched transformer control[J]. IEEE Transa- ctions on Industrial Electronics, 2012, 60(1): 249-260.