Design and Implementation of a 6.78-MHz Wireless Charger for E-bike Applications

This paper presents a significant contribution in the development of a high-efficiency, high-power-density wireless charger for E-bikes. By utilizing a 6.78 MHz switching frequency and employing wide band gap devices (GaN) and Schottky diodes, the system achieves remarkable advancements in power component selection, leading to reduced switching losses and improved performance. Moreover, the integration of high-frequency magnetic materials in the coils enhances coupling and minimizes the impact on the surrounding magnetic field. The use of Maxwell analysis software enables accurate simulation and optimization of the circuit, coil, and core design. By addressing phase-related challenges through the implementation of an auxiliary circuit, the issue of voltage switching is effectively mitigated. Ultimately, the achieved wireless charger for E-bikes stands out with its 110V input/output voltage, 240W output power, 6.78 MHz switching frequency, and an impressive maximum efficiency of 92.45%. This research contributes significantly to the advancement of wireless charging technology for E-bikes, offering valuable insights for further development and practical applications in the field.