An Efficient Power and Data Synchronous Transfer Method for Wireless Power Transfer System Using Double-D Coupling Coil

To achieve power and data synchronous transfer efficiently in the wireless power transfer system, a novel injection wireless communication method is proposed. Combined with the characteristic of the double-D coupling coil, the data are directly injected into one of the D coils and can be entirely coupled to the data receiving side and, therefore, the power lossless data transfer is obtained. Unlike traditional injection power and synchronous data methods, the additional wave trapper or trap inductor is not required with the proposed approach, and the power is delivered efficiently. The power transfer link and data transfer link are, respectively, analyzed, and the method to improve the data rate is proposed. Additionally, the interference between power and data delivery has been explored. The high-order harmonic interference with the data can be efficiently suppressed due to the low-pass filter characteristic of inductor--capacitor--capacitor ( LCC / LCC ) resonant composition topology, and the condition to eliminate the fundamental frequency power interference is proposed. A 150-W prototype is established to validate the performance of the proposed system. The experimental result indicates that the dc-dc power transfer efficiency reaches 90%, and the data rate is 166.7 kbps.