无接触供电系统功率和效率的分析与优化

为解决在无接触供电系统中,传统的互感耦合系数无法提供原副边独立设计,造成系统功率和效率设计困难的问题,提出一种新的能效计算方法。基于新的耦合系数定义,推导了副边串并联补偿功率和效率,实现了磁感应结构能效设计解耦。通过分析副边绕组匝数、品质因数、截面积等磁耦合结构参数与能效的关系,发现了能效与副边匝数无关的特性,并给出了无接触供电系统的原、副边参数设计流程,提出了功率和效率优化原则和方法,达到了优化磁芯结构、提高系统功效的目的。最后,开发了实验样机,通过实验和仿真验证了理论分析的正确性。

Analysis and Optimization of Transmission Power and Efficiency for Contactless Power Transfer System

In a contactless power transfer (CPT) system, it is impossible to accomplish primary and secondary part design independently by the traditional mutual inductance coefficient, which results in design difficulty of system power and efficiency. Therefore, a new method is proposed to calculate power and efficiency. Based on a new definition of mutual inductance coefficient, power and efficiency of the secondary part which is compensated in both series and parallel circuit are inferred, and the design of magnetic structure is decoupled. By analyzing the relation of power and magnetic parameter, such as winding number, quality factor and sectional area of secondary coil, it is found that the transmission power and the efficiency of the secondary part are independent of the number of the secondary winding. Moreover, the primary and secondary parameter design flow is given, and the optimization principle and method for transmission power and efficiency are presented, which are beneficial to the size reduction of magnetic core and the increasement of transmission power and efficiency. Finally, the prototype is developed and the validity of the optimization method is verified by the simulation and the experiment.