一种高偏移容限的无线电能传输系统设计

针对电动汽车充电应用的感应式无线电能传输技术凭借其安全可靠、灵活方便的特点受到广泛研究。该技术所使用的松散耦合变压器通常存在较大的漏感,从而大幅降低变压器的耦合系数和系统的功率传输能力,当变压器的原副边在电动汽车泊车后发生偏移时,该特性尤为突出。提出了一种具有高偏移容限特性的感应式无线电能传输系统设计,其松散耦合变压器结合了螺线管型和双解耦绕组型线圈结构的耦合特性,可以实现更大的偏移范围;另外,给出了与所提变压器结构相匹配的电路拓扑适用条件,并分析总结了原副边采用不同的补偿拓扑以及电路输出端采用不同的连接方式时系统的输出特性。通过三维有限元仿真工具,在正对以及偏移条件下对变压器的耦合特性进行仿真分析,并在具有200 mm气隙间距的3 kW实验平台上进行实验验证。

Design of A Wireless Power Transfer System with High Misalignment Tolerance

Inductive power transfer (IPT) technology is widely researched for electric vehicle charging because of safe, flexible and convenient features. The loosely coupled transformer has large leakage inductance, especially when there is misalignment between the pads. The misalignment largely reduces coupling coefficients and the power transfer capability. This paper proposes an IPT system design with high misalignment tolerance. The transformer combines characteristics of solenoidal and bipolar coil structures. A higher misalignment tolerance range can be obtained. Circuit topology condition that matches the transformer structure and some comparisons are developed and analyzed. The system design and performance are simulated with a 3D finite element mod-eling tool and experimentally verified on a 3 kW prototype with a 200 mm air gap.