摘要：无线充电串串谐振网络输出电压、电流随间距成正比，如果间距突发极大会导致电路烧毁。针对该问题，本文在分析了无线充电装置的电路结构、谐振补偿、控制算法的基础上，利用电磁有限元Maxwell软件建立线圈盘模型，电路仿真软件Simplorer建立无线充电的脉冲控制回路，建立一套3kW大功率WPT系统模型，通过检测发射侧与接收侧整流后母线电流电压，判断系统DC-DC效率来调整逆变器的PWM占空比与开关频率。结果表明该系统在合理间距时传输效率明显提高，在突发大间距时电流得到控制，证明了采用本文提出的无线充电系统控制方法的安全、高效。
关键词：无线充电；有限元；母线电流检测；效率跟踪

Abstract: The output voltage and current of the wireless power transfer serial resonant network are proportional to the spacing, if the spacing bursts greatly, the circuit will be burnt down. 3kW Wireless Power Transfer(WPT) system circuit, resonance compensation and control algorithms were studied in the paper, the coil model was established by finite element electromagnetic field software Ansys Maxwell, and WPT control circuit was built by Ansys Simplorer. The PWM duty ratio and the switching frequency of the inverter were adjusted by measuring the DC current voltage and judging the DCDC efficiency. Simulation results show that transmission efficiency was improved with the reasonable spacing, the system current was controlled with large spacing, and the effectiveness of control method was proved.
Key words: wireless power transfer; FEM; bus current measuring; efficiency tracking