FPGA based control of series resonant converter for contactless power supply

A novel inductive contactless energy transmission (CET) system is presented in this work. The energy is transmitted using rotatable transformer with adjustable air gap and power converter. To minimize total losses of the system a series resonant circuit is applied. This ensures zero switching condition for MOSFET power transistors. The expression and analytical results of the transfer DC voltage gain are shown in this paper. The novelty of the system lies in application of FPGA based controller and protection system. The resonant frequency is adjusted by extreme regulator which follows instantaneous value of primary peak current. Some simulated and experimental results which illustrate operation of developed 3 kW laboratory model are presented.