A Double-Receiver Compact SCC-WPT System With CV/CC Output for Mobile Devices Charging/Supply

The single capacitance coupled wireless power transfer (SCC-WPT) technology facilitates improving the spatial freedom of the system to offer charging/supply services in 2-D planar. This article proposes a double-receiver SCC-WPT system with three-plate compact coupler to achieve free-position charging and superior system performance. The system consists of two independent receivers: one receiver adopts the
LCLC
-S topology to achieve constant-voltage (CV) output, while the other adopts the
LCLC
-M topology to achieve constant-current (CC) output and did not affect each other. By circuit analysis, a simplified equivalent circuit of the three-plate coupler is established and, on this basis, the CV and CC characteristics are theoretically analyzed. The effectiveness of the proposed system is verified by building a prototype system, where the coupler and parameters are designed and optimized. The experimental results show that the two receivers can realize CV output and CC output, respectively. The output characteristic of each receiver is almost unchanged when another receiver is removed or moved in. The receiver can obtain stable output power at any position within the transmitting plate.