A Dual-Frequency Hybrid Wireless Charging System With Anti-Offset Integrated Receiver for Mobile Desktop Charging

In wireless charging for consumer electronics, enhancing misalignment tolerance ability can improve user experience. To achieve this goal, this paper proposes a novel dual-frequency hybrid wireless charging system, which combines the series-series (S-S) and double-sided inductor capacitor capacitor (LCC-LCC) topologies at two different frequencies. The S-S and LCC-LCC topologies have opposite trends against misalignment and combining them can help achieve misalignment-tolerance characteristics. The S and LCC compensations are paralleled at the primary side and integrated at the secondary side. Thus, there are two transmitting coils, which are stacked for cross-coupling elimination, and only one receiving coil to reduce the size and weight of consumer electronics. The mathematical models are built and the misalignment tolerance mechanism is analyzed. The magnetic coupler and the design flow chart are presented. Finally, an experimental prototype is established to verify the feasibility of the proposed system. Both the misalignment-tolerance performance and the constant-current (CC) output are tested. The experimental results are well aligned with calculated ones, indicating that the proposed scheme has good misalignment tolerance performance and CC output, which is suitable for mobile desktop charging.