A Load-Independent Wireless Power Transfer System With Multiple Constant Voltage Outputs

A novel wireless power transfer (WPT) system is proposed to power the gate drivers in a multilevel converter to achieve a high insulation level. There are two requirements for the proposed WPT system. First, the WPT system should contain multiple outputs, each corresponding to one gate driver. Second, a constant voltage source is needed for each gate driver. For a multiload WPT system, it is challenging but necessary to realize independent power control of each load. To achieve this goal, the repeater unit consisting of two repeater coils is designed to power a load. Many loads can be powered simultaneously by using multiple repeater units together. The LCC-S compensation topology is adopted for the proposed WPT system. Constant voltage outputs are obtained for all the loads when neglecting the coil's parasitic resistance. An experimental platform with six loads was developed to validate the proposed WPT system.