Testing of efficiency and power transferred from the source to the receiver in various wireless power supply systems

The article presents 4 wireless power supply systems for electrical devices. Two-coil systems were presented in different power supply systems. Efficiency and output power without and in the state of resonance were compared. Also, test results for the secondary side compensation were presented. The testing was aimed at finding the highest efficiency of the system to power a receiver with a different load resistance. It was performed within the coil distance range between 1.5 cm and 5 cm.