WIRELESS POWER TRANSMITTING DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

摘要

A power transmitting device determines transmitting power P(t1) at a beginning of a first unit time, and transmitting power P(t2) at an end of the first unit time, stores a control parameter Q(t3) that determines a voltage of the transmitting power at a beginning of a second unit time, and a control parameter Q(t4) that determines a voltage of the transmitting power at an end of the second unit time, determines a power difference ”P = P(t2) - P(t1) and a difference ”Q = Q(t4) - Q(t3) in the control parameter Q, and, if the ”P is equal to or larger than a first threshold and an absolute value of the ”Q is equal to or larger than a second threshold, determines that there is a foreign object between a receiver resonator and a transmitter resonator and decreases the transmitting power output from an inverter circuit.