Compact wireless battery charger

Abstract

The invention discloses a compact wireless battery charger based on a wireless power transmission (WPT) technology. The compact wireless battery charger is used for an electric vehicle and an electricbicycle and does not have any communication requirement. A novel intermediate coil is designed to realize the output of constant current (CC) and constant voltage (CV) regardless of the load. The intermediate coil is divided into two coils and is overlapped with a receiver coil to form a compact structure. Two switches on the lateral sides of a receiver are used to reconfigure a middle resonancecircuit to choose a different charge mode, and thus a complicated sensor and a closed-loop controller are not needed. Zero phase angle (ZPA) operation, fixed operation frequency and zero voltage switch (ZVS) can be realized, the rated power of a power device can be reduced, and the efficiency is improved. 本发明公开了一种用于电动车辆和电动自行车的没有任何通信要求的基于无线电力传输(WPT)技术的紧凑型无线电池充电器。在此，设计了新的中间线圈以实现与负载无关的恒定电流(CC)和恒定电压(CV)输出。中间线圈被分成两个线圈并且与接收器线圈交叠以形成紧凑的结构。接收器侧的两个开关用于对中间谐振电路进行重新配置以选择不同的充电模式，因此不需要复杂的传感器和闭环控制器。此外，本发明可以实现零相位角(ZPA)操作、固定的操作频率和零电压切换(ZVS)，这不仅可以降低功率器件的额定功率，而且可以提高效率。