Adaptable Impedance Modulation Circuitry Based Wireless Charging System for On‐Road E‐Bikes

ABSTRACTIn on‐road e‐bike charging technology, traditional wireless charging systems often struggle to maintain controllable power output due to fluctuations in coupling coefficients and differences in battery types and electric bicycles (e‐bikes) structures. To address these challenges, this article introduces a versatile wireless charging circuit incorporating variable inductor and capacitor arrays, complemented by a novel impedance‐modulation control method. This wireless charger is designed to accommodate varying coupling coefficients and power requirements, enabling efficient battery charging for on‐road e‐bikes. First, the circuit parameters are customized by the impedance modulation requirements of the load, including the variation range of variable inductance and capacitance. Second, the complex interactions between variable inductor, capacitor arrays, coupling coefficients and output power are explored and mathematically modeled through analysis. Finally, a prototype with an output power of 50 W and maximum system efficiency of 86.78% is built to validate the proposed method. The experimental validation shows that the output power is almost constant when is varied from 0.15 to 0.25.