Resonance oscillator circuit and contactless power supply system

A contactless power supply system comprising:

• a power transmission apparatus comprising a resonance oscillator circuit;
• and
• a power reception apparatus,
• wherein the resonance oscillator circuit comprises:
• a first oscillator that includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element;
• and
• a second oscillator that oscillates by generating a gate signal, which has a frequency identical to that of the output voltage and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit,
• wherein the phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied,
• wherein the power reception apparatus comprises:
• a second LC resonator circuit that is coupled to the first LC resonator circuit, and receives an AC power from the first LC resonator circuit, and
• a first rectifier circuit that rectifies the AC power received by the second LC resonator circuit to a DC voltage, and outputs the DC voltage to a predetermined load, and
• wherein the phase difference is a value substantially independent of inductances of the first and second LC resonator circuits and a load, to which the output voltage is applied.