错位条件下基于“感应盲点”分析的非接触变压器建模及优化

Modeling and Optimization of Contactless Transformer Based on "Null Coupling Position" Analysis Under Coil Misalignment

感应式无线电能传输系统中,非接触变压器存在错位等多种工况,引起耦合系数等参数大范围变化,影响系统特性。为了建立错位条件下非接触变压器的耦合系数模型,文中基于场路结合的分析方法,分析磁通耦合特性,给出了非接触变压器的"感应盲点"求解方法;并结合其耦合系数的变化规律,建立非接触变压器错位条件下耦合系数的计算模型。基于磁场分布的特点,进一步提出副边多绕组的新型非接触变压器结构。采用优化后的变压器结构,设计制作了60 W输出的非接触变换器,耦合系数的计算结果和实际测试结果一致,证明了所提"感应盲点"分析方法与耦合系数计算模型的正确性,验证了优化后的新型非接触变压器具有良好的错位自适应能力。

In the inductive wireless power transfer system,the specified operating condition such as coil misalignment will cause the coupling coefficient of the contactless transformer to vary in a large range,further affecting the system operating characteristics.To build the coupling coefficient model under large coil misalignment,this paper gives an effective method for calculating the null coupling position based on the method of combining the field concept with circuit.According to the change law of the coupling coefficient,a model for finding the coupling coefficient under coil misalignment is developed.Then a novel contactless transformer with multiple receiving coils is proposed based on the characteristics of magnetic field distribution.A60 Wcontactless energy transmission system is designed with the optimized contactless transformer structure.The calculation results of the coupling coefficients are in agreement with actual test results,which proves the correctness of the proposed method and model.The novel coil set has achieved good tolerance to coil misalignment.