Abstract
A compact spatial free-positioning wireless charging system with a novel three-dimensional (3D) transmitting (Tx) coil is proposed to charge consumer electronics in the working area. Because of the strengthened electromagnetic field generated by the proposed 3D Tx coil in the space, this system can charge consumer electronics wirelessly with great tolerance to positional and angular misalignments between the transmitter and receiver. Benefiting from the compact design of the 3D Tx coil, the system can be easily embedded in some corners of office furniture/cubic panels, which will not cause any extra working space consumption when charging devices. The inductor-capacitor-capacitor (LCC) compensation circuit on the Tx side can achieve constant current output, which is independent of load condition and can protect the transmitter. With the LCC compensation circuit, the MOSFETs of the H-bridge high-frequency inverter realized zero voltage switching (ZVS). The small-sized planar receiving (Rx) coil and series (S) compensation circuit is applied to achieve compact receiver design. The theoretical and experimental results show that the spatial free-positioning wireless charging prototype can transfer 5 W to the small-sized receiver in around 350 mm × 225 mm × 200 mm 3D charging area and achieve the highest efficiency of 77.9%.
Highlights
Wireless power transfer (WPT) technology enables users to charge electronics without the inconvenience caused by the physical cable
From the waveforms of Uin, I1, and I2, we can find that the current flowing through Tx and Rx coil has good sinusoidal properties and Uin leads I1 by almost 90°, which is identical with the theoretical analysis. This means that the compensation circuit works well
Output voltage of the inverter and the MOSFET of the H-bridge works in zero voltage switching (ZVS)
Summary
Charging System for Consumer Electronics Using a Three-Dimensional Transmitting Coil. Ziwei Liang 1,2 , Jianqiang Wang 1,3 , Yiming Zhang 2 , Jiuchun Jiang 4 , Zhengchao Yan 2,5 and. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Beijing 100044, China
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