适用于分段式动态无线充电的接力方法

Relay Control Method for Sectional Track Based Dynamic Wireless Charging System

按动态无线充电技术设想铺设充电道路,给行驶中的电动汽车不间断地提供电能,为解决动力电池瓶颈问题提供了一种可行途径。为了降低线圈损耗和磁场泄露水平,充电道路采用分段式布局。但是分段式布局使得原边线圈数量增加,需要对原边线圈链供电管理进行实时调控。为此,提出一种基于副边主动激励探测的具有分散控制逻辑的接力方法,保证只对提出无线充电请求的电动汽车下方的原边线圈激励,实现精准定位和局域供电。该方法充分复用了原/副边功率线圈,无需增加额外的传感装置和集中信号线路。主动激励探测电路配置为串—串型补偿网络,并利用其频率分裂特性,增强探测信号强度,避免副边主动激励过流问题。同时设计了合理的接力控制流程,降低探测所需功率,避免原副边同时激励冲突。最后搭建了5∶1缩比尺寸的分段式动态无线充电演示平台,实现8个原边线圈的有效接力,验证了所提接力方法的可行性。

Dynamic wireless charging is imagined to uninterruptedly charge moving electric vehicles （ EVs） through the powered roadway as a potential solution to the battery bottleneck . In order to reduce the power coils loss and leakage magnetic field , the primary coils layout usually adopts sectional track type . However , the number of primary coils increases rapidly and a power supply management of primary coils chain should be required . Thus , a relay control method for dynamic wireless charging system based on the secondary active excitation and distributed control diagrams is proposed , ensuring accurate positioning and local excitation mode . As the primary and secondary power coils are fully reused , no additional sensing devices and centralized signal lines are needed . The secondary active excitation is based on the S‐S type compensation network with the excitation frequency set at the splitting point to enhance the strength of detection signal and solve the overcurrent problem of secondary excitation . With the design of rational relay control flow , the detection power is reduced and the conflict of excitation between the primary and secondary sides is avoided . Finally , a 5 ∶ 1 physical scale‐down dynamic wireless charging demonstration platform based on sectional track is built . The relay power management of eight primary transmitter coils is realized to verify the feasibility of the proposed relay control method .