NON-CONTACT ELECTRIC POWER SUPPLYING EQUIPMENT, NON-CONTACT ELECTRIC POWER RECEIVING DEVICE, AND NON-CONTACT ELECTRIC POWER SUPPLYING SYSTEM

摘要

Electric power supplying equipment and an electric power receiving device include a primary self resonant coil and a secondary self resonant coil, respectively, resonating through an electromagnetic field to allow the electric power supplying equipment to supply the electric power receiving device with electric power in a non-contact manner. A control device controls a high frequency electric power supply device to control supplying electric power from the primary self resonant coil to the secondary self resonant coil. The control device estimates a distance between the primary self resonant coil and the secondary self resonant coil from an S-parameter S11 varying with the distance between the primary self resonant coil and the secondary self resonant coil, and controls supplying electric power, based on that estimated distance.