CONTACTLESS POWER SUPPLY EQUIPMENT, CONTACTLESS POWER RECEIVER AND CONTACTLESS POWER SUPPLY SYSTEM

摘要

Power is fed contactlessly from power supply equipment (1) to a power receiver (2) by a primary self-resonant coil (30) of the power supply equipment (1) and a secondary self-resonant coil (60) of the power receiver (2) resonating through an electromagnetic field. A controller (40) controls the supply of power from the primary self-resonant coil (30) to the secondary self-resonant coil (60) by controlling a high-frequency power source device (10). Here, the controller (40) estimates the distance between the primary self-resonant coil (30) and the secondary self-resonant coil (60) based on a parameter (S11) that changes according to the distance between the primary self-resonant coil (30) and the secondary self-resonant coil (60), and controls the supply of power based on the estimated distance.