Frequency control is widely used in wireless battery charging (WBC) systems due to its hardware simplicity. However, existing methods are fundamentally limited by the frequency splitting (FS) issue. This paper proposes a novel frequency control method to solve FS. The FS mechanism is first analyzed, and the threshold load resistance triggering FS is derived. Utilizing the identified resistance, a hybrid approach combining constant- and variable-frequency schemes is then proposed. The proposed method effectively addresses FS challenges without restrictive load or coupling constraints, while also achieving wide power regulation and full-range zero-voltage switching (ZVS) without extra hardware. Experiments validate its effectiveness.
