A Dual-Frequency Resonant Single-Ended IPT Converter With Enhanced Power Transfer Capability

In the design of single-ended inductive power transfer (IPT) converters, the prevalent reliance on the fundamental harmonic approximation (FHA) often results in an underutilization of the input voltage. This article provides new insights into this problem by deriving and demonstrating that the power transfer capability of a single-ended IPT converter can be enhanced by utilizing the second harmonic component. A novel dual-frequency resonant single-ended IPT converter is designed to allow load-independent voltage output at both the fundamental and second harmonics. This design could improve the power transfer capability without increasing the voltage stress on the power switch. Compared with the conventional single-ended converter with the same output power, the coil currents in the proposed converter are lower. Additionally, the advantages mentioned above are unaffected by coil misalignment. An experimental prototype has been constructed to validate the effectiveness of the proposed method.