| 摘要 |
To provide an induced power transmission circuit that transmits, from a transmission antenna (1) connected to a power supply circuit, an AC power having an angular frequency ω to a spaced reception antenna (2) with an excellent efficiency, thereby transmitting it to a load circuit. The induced power transmission circuit comprises a circuit the two ends of which are coupled by a capacitor (C1) and in which the power supply circuit is connected in series to a midway port (1) (P1) of the transmission antenna (1) having an effective self-inductance L1; and a circuit the two ends of which are coupled by a capacitor (C2) and in which the load circuit is connected in series to a midway port (2) (P2) of the reception antenna (2) having an effective self-inductance L2; wherein for a coupling coefficient k of the electromagnetic induction between the antennas and for a phase angle &bgr; having an arbitrary value, the angular frequency ω is set to the square root of the reciprocal of a value of L2×C2×(1+k*cos (&bgr;)), the output impedance of the power supply circuit is set to approximately kωL1*sin (&bgr;), and the input impedance of the load circuit is set to approximately kωL2*sin (&bgr;). There is also provided an impedance converting circuit that converts the circuit impedances.
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