Constant Current Charging and Maximum Efficiency Tracking Control Scheme for Supercapacitor Wireless Charging
Constant Current Charging and Maximum Efficiency Tracking Control Scheme for Supercapacitor Wireless Charging
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DOI：
10.1109/tpel.2018.2793312
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发表时间：
2018-01
影响因子：
6.7
通讯作者：
Zhenjie Li;Kai Song;Jinhai Jiang;Chunbo Zhu
中科院分区：
文献类型：
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作者：
Zhenjie Li;Kai Song;Jinhai Jiang;Chunbo Zhu
无线功率传输系统的充电电流和效率取决于超级电容器负载的等效负载电阻，其在充电期间变化。为了实现恒流充电和变负载下的最大效率，提出了采用原边移相H桥逆变器和副边半有源整流器的控制方法。所提出的二次侧控制方法不仅实现了CC充电，而且还确保了半有源整流器中看不到无功阻抗。此外，最大效率跟踪是基于对任何给定输出功率搜索最小系统直流输入电流。该方法采用移相H桥逆变器实现，并采用扰动观测法进行控制。仿真和实验结果验证了该控制方法的可行性。在3A的CC充电过程中，最大效率为81%，在轻载时最大效率提高了15.2%。该控制方法提高了系统的性能，适用于要求紧凑的接收机和发射机和接收机之间没有无线通信链路的应用。
Charging current and efficiency of a wireless power transfer system depend on the equivalent load resistance of supercapacitor load, which varies during charging. To achieve constant current (CC) charging and maximized efficiency under variable loads, control method that employs primary-side phase shift H-bridge inverter and secondary-side semiactive rectifier are proposed. The proposed secondary-side control method not only achieves CC charging, but also ensures no reactive impedance seen into the semiactive rectifier. Furthermore, the maximum efficiency tracking is based on searching the minimum system dc input current for any given output power. It is realized by phase shift H-bridge inverter that is controlled by the perturbation and observation algorithm. Simulation and experimental results validate the feasibility of the proposed control method. During CC charging of 3 A, the maximum efficiency is 81% and largest efficiency improvement is 15.2% at light load. The proposed control method improves the system performance and is suitable for the applications that require compact receiver and no wireless communication link between the transmitter and the receiver.