Optimization of MHz Wireless Power Transmission Distance Based on GaN Device

Aiming at the problems of low natural frequency and small transmission distance of traditional magnetically coupled resonant wireless power transfer systems, the GaN device is used as an inverter bridge to widen the natural frequency domain of the system, and the influence of the natural frequency and working frequency of the system on the transmission distance is studied in the high-frequency range. The natural frequency of the system is taken as a variable parameter from the perspective of the equivalent circuit, and together with the working frequency and transmission distance, it is used as the influencing factor affecting the output power of the wireless power transmission system. The expression of the system-normalized transmission power is obtained, and the relationship between the transmission distance and other parameters is analyzed. Finally, a complete set of a series-series wireless power transfer system based on GaN devices is designed. The results are promising and in agreement with theoretical analysis, verifying that under the system detuning coefficient of 0, the transmission distance corresponding to the maximum transmission power of the system will increase with the increase in the natural frequency of the system.