电路参数对无线电能传输的影响及控制策略

Influence of Circuit Parameter on Wireless Power Transmission and Control Strategy

无线电能传输(WPT,wireless power transmission)系统的输出电流受原边电流、频率、线圈距离(耦合系数)、负载阻抗等影响。在负载及耦合系数一定时,接收侧的补偿电容影响系统的性能。为了保证系统的传输效率且使得系统输出电流最大,首先给出了WPT电路并进行电路分析,其次讨论结构参数对系统性能的影响,为调节系统最大电流输出提供依据。给出一种系统最大电流输出控制策略,并进行仿真验证。最后仿真对比了不同耦合系数对输出电流、输出功率及传输效率的影响。仿真结果表明,在该控制策略下,适当调整系统电容参数,即可使得系统输出性能最佳。

The output current of wireless power transmission（WPT） system is affected by the primary side cur- rent, frequency, coil distance （ coupling coefficient） and load impedance. When the load and the coupling coef- ficient are constant, the compensation capacitance in the receiving side influences the performance of the sys- tem. In order to ensure the transmission efficiency of the system and make the output current of the system maximum, WPT circuit and circuit analysis are given, and then the effects of structural parameters on the sys- tem performance are discussed, which provides the basis for adjusting the maximum current output of the sys- tem. The maximum output current control strategy is given and verified by simulation. Finally, the influences of different coupling coefficients on output current, outper power and transmission efficiency are compared by sim- ulation. The simulation results show that under this control strategy, through adjusting system capacitance pa- rameters appropriately, it can make the system output performance best.