磁感应耦合无线电能传输系统控制与效率研究

Research on Efficiency Analysis and Control Strategy of Inductively Coupled Wireless Power Transmission System

以全桥逆变器拓扑的磁感应耦合无线电能传输系统为例,提出了一种控制系统工作频率的方法。通过采样二次侧输出电压,经PI调节器输出频率信号,反馈给一次侧改变系统的工作频率进而控制系统输出电压和功率。同时分析系统谐振网络输出功率、效率与系统工作频率和松耦合变压器互感的关系,进而确定松耦合变压器参数与系统频率工作范围。最后进行试验验证,试验结果与理论计算基本上一致,验证了理论分析的可行性。

Based on the inductively coupled wireless power transmission system with full bridge inverter,a method of controlling the operating frequency of the system was proposed. In this method,the secondary output voltage is sampled. Then through the PI regulator,the frequency signal is generated. The output frequency signal is taken as feedback transmitted to the primary side to change the operating frequency of the system. As a result,the system output voltage and power are controlled. At the same time,the relationship between the output power and efficiency of the resonant network and the working frequency and the mutual inductance of the loosely coupled transformer is analyzed. Then the working parameters of the loosely coupled transformer and the system frequency are determined. Finally,the experimental platform was validated. The experimental results are basically in agreement with the theoretical calculation,which verifies the feasibility of the theoretical analysis.