WIRELESS POWER RECEIVING DEVICE, WIRELESS POWER SUPPLYING DEVICE, AND WIRELESS POWER SUPPLYING SYSTEM

摘要

An automatic tuning auxiliary circuit (30) is coupled to a transmission antenna (20) and injects a first correction current (IA) into or extracts the first correction current (IA) from the transmission antenna (20). In a first state (phi1), a first auxiliary coil (LA1) is coupled to the transmission antenna (20) and the first correction current (IA) corresponding to the current flowing through the first auxiliary coil (LA1) is injected into or extracted from the transmission antenna (20). In a second state (phi2), the first auxiliary coil (LA1) is disconnected from the transmission antenna (20) and the current (ILA1) flowing through the first auxiliary coil (LA1) flows through a current path independent of the transmission antenna (20). The first state (phi1) and the second state (phi2) are switched to each other at the same frequency as that of a driving voltage (VDRV).