MAGNETIC RESONANCE WIRELESS POWER TRANSFER DEVICE

[Problem] To provide a magnetic resonance wireless power transfer device which allows constant transmission power and high transmission efficiency to be maintained over a long transmission distance even when the distance (transmission distance) between a transmitter coil and a receiver coil changes. In a magnetic resonance wireless power transfer device wherein a negative resistance circuit a transmitter resonant circuit having a transmitter coil and a receiver resonant circuit having a receiver coil are configured so that the parity-time symmetry is preserved, out of two resonant loops (Loop I and Loop II) in which a resonant current is circulatable when the transmitter resonant circuit and the receiver resonant circuit are regarded as a double resonant circuit coupled with a mutual inductance, Q value of the Loop II is set to be higher than Q value of the Loop I, so that oscillation occurs in the Loop II in which a leakage inductance component of the coil and a capacitance component of a capacitor resonate.