摘要
针对电动汽车无线充电时线圈偏移会造成输出电压不稳定和效率迅速降低的问题,设计一个抗偏移性能优异的电动汽车用无线电能传输(wireless power transfer,WPT)系统,该系统采用LCC/S补偿拓扑以及扁平螺线管磁耦合结构,并在后级加入数字闭环Buck变换器,以实现精确的恒压输出。分析LCC/S补偿拓扑的输出特性,说明扁平螺线管磁耦合结构抗偏移性能优异的原因,借助有限元仿真软件优化线圈和磁芯的尺寸。为验证理论分析,搭建输出功率恒定为500W的系统样机,样机使用的磁耦合结构的外尺寸为306mm×300mm×16mm。结果表明,当传输距离176mm时,能量传输效率高达88%,即使横向偏移达到230mm,系统仍能输出恒定电压。
Aiming at the problem that the misalignment of coils during wireless charging of electric vehicles will cause instability of output voltage and rapid decrease of efficiency,this paper designed an electric vehicle(EV)-oriented wireless power transfer(WPT) system featuring high misalignment tolerance. The system used LCC/S compensation topology and flat solenoid coupler, and added digitally closed-loop Buck converter in the latter stage to achieve accurate constant voltage output. This paper analyzed output characteristics of e LCC/S compensation topology, and explained excellent misalignment tolerance of flat solenoid magnetic coupler. The finite element simulation software was used to optimize size of the coil and core. In order to verify theoretical analysis, a prototype with constant output power of 500 W was built. The magnetic coupler used in the prototype had an outer dimension of 306 mm×300 mm×16 mm. When the transmission distance was 176 mm, the energy transmission efficiency was as high as 88% and the system could still output a constant voltage, even if the lateral offset reached 230 mm.
引文
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