A Hybrid Compensation Topology With Constant Current and Constant Voltage Outputs for Wireless Charging System
Yiming Zhang, Guo Wei, Chao Wang, Yongping Yin, Jing Feng, Tuopu Na, Kai Song, Chunbo Zhu
Abstract
To guarantee safety and durability, the battery is generally required to charge with constant current (CC) first and then shift to constant voltage (CV). For the traditional topology, CC and CV outputs can only be achieved with a fixed coupling coefficient, and the parameters of the system need to be redesigned when the coupling coefficient is changed. To solve the problem, a novel transmitter-side series and receiver-side capacitor–inductor–capacitor–capacitor (S-CLCC) compensation topology with CC and CV outputs under zero phase angle (ZPA) conditions is proposed, in which the CC mode and the CV mode can be converted only by switching the operating frequency. For the selected mode, the operating frequency can be maintained constant when the coupling coefficient is varied. In addition, the method of topology compensation is presented to realize ZPA input, and a new calculation method of compensation parameters is given. To achieve the continuous conduction mode (CCM) of the uncontrolled rectifier, a filter with a double bandpass is applied to the system. Finally, the experimental setup with 2.7-A charging current and 80.0-V charging voltage is built to verify the feasibility of the proposed topology, and the results show that the load-independent CC and CV outputs under ZPA conditions can be realized.