Parameter Design of Dual Frequency Constant Voltage Output in Wireless Power Transmission

A parametric design method for dual frequency constant voltage output based on LCC-LCC topology is proposed. Firstly, topological analysis of the LCC-LCC topology is presented, and the system can achieve constant voltage output at two operating frequencies. The operating frequency, voltage gain, parameter settings, and transmission efficiency can be obtained. Secondly, the AC-AC efficiency and voltage gain of the two cases are simulated. With the increase of coupling coefficient, the transmission efficiency of Case A decreases, while the transmission efficiency of Case B increases. The voltage gain of Case A increases while the voltage gain of Case B decreases with increasing coupling coefficient. The transmission efficiency and voltage gain have complementary characteristics in two cases. Therefore, to improve the transmission efficiency over a wide transmission range, the system’s operating frequency can be set according to the coupling coefficient. Finally, it can be found from simulation results that the minimum AC-AC efficiency within the coupling coefficient of 0.2 to 0.6 is 95.0%.