考虑整流性负载特性的LCC-S型无线电能传输系统优化设计

无线电能传输系统中的整流性负载具有非线性特征，而对系统传输特性分析和谐振参数设计时常采用基波分析法，将整流性负载等效为纯电阻，导致理论分析与实际存在一定偏差、系统偏离谐振状态。针对该问题，以LCC-S型无线电能传输系统为研究对象，考虑谐波以及整流性负载的非线性，对系统传输特性进行分析，进而提出基于整流性负载补偿的负载阻抗和接收端串联谐振电容参数的计算方法，并对逆变电路开关特性进行分析验证。所提接收端谐振参数设计方法能够使系统接收端回路谐振，提高系统的输出功率；降低逆变电路开关管的关断电流，提升系统的传输效率。搭建了一套2.5 kW的LCC-S型无线电能传输实验平台，验证了理论分析与所提参数设计方法的有效性和正确性。

Optimal design of LCC-S wireless power transfer system considering rectifier load characteristics

The rectifier load in the wireless power transfer(WPT) system has nonlinear characteristics. In the analysis of system transmission characteristics and the design of resonance parameters, the fundamental harmonic approximation(FHA) is often adopted which regards the rectifier load as an equivalent resistance, resulting in a certain deviation between the theoretical analysis and the actual case, and the system deviates from the resonance state. To solve this problem, the LCC-S WPT system is taken as the research target, and the transmission characteristics of the system are analyzed considering the harmonics and the nonlinea-rity of rectifier load. The calculation method of load impedance and the parameter of resonant capacitor in series at the receiver-side based on rectifier load compensation is proposed, and the switching characteristics of the inverter circuit are analyzed and verified. The proposed design method of receiver-side resonance parameters can make the receiver loop of the system resonant and improve the output power of the system, reduce the turn-off current of the inverter switches and improve the transmission efficiency of the system. A 2.5 kW experiment platform of LCC-S WPT system is built, which verifies the effectiveness and correctness of both theoretical analysis and the proposed parameter design method.