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 phase-shifted output voltage back to the amplifier element the predetermined phase difference being determined to operate the first oscillator;
• 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 predetermined 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 predetermined 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 predetermined 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,
• wherein the first oscillator is a Colpitts oscillator,
• wherein the second oscillator is any one of a class E−1 oscillator and a class E oscillator, and
• wherein the first LC resonator circuit is a first parallel circuit of a first capacitor and a first series circuit including a second capacitor and a first inductor, which are connected in series to each other, and the phase-shifted output voltage is fed back from a connection point of the second capacitor and the first inductor to the amplifier element.

A resonance oscillator circuit comprising:

• 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 a phase-shifted output voltage back to the amplifier element, the predetermined phase difference being determined to operate the first oscillator;
• 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 predetermined 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 predetermined 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 first oscillator is a Hartley oscillator,
• wherein the second oscillator is any one of a class E−1 oscillator and a class E oscillator, and
• wherein the first LC resonator circuit is a second parallel circuit of a second inductor and a second series circuit including a third capacitor and a third inductor, which are connected in series to each other, and the phase-shifted output voltage is fed back from a connection point of the third capacitor and the third inductor to the amplifier element.

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 a phase-shifted output voltage back to the amplifier element, the predetermined phase difference being determined to operate the first oscillator;
• 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 predetermined 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 predetermined 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 predetermined 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,
• wherein the first oscillator is a Hartley oscillator,
• wherein the second oscillator is any one of a class E−1 oscillator and a class E oscillator, and
• wherein the first LC resonator circuit is a second parallel circuit of a second inductor and a second series circuit including a third capacitor and a third inductor, which are connected in series to each other, and the phase-shifted output voltage is fed back from a connection point of the third capacitor and the third inductor to the amplifier element.

A resonance oscillator circuit comprising:

• 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 a phase-shifted output voltage back to the amplifier element, the predetermined phase difference being determined to operate the first oscillator;
• 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 predetermined 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 predetermined 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 first oscillator is a back-coupling oscillator,
• wherein the second oscillator is any one of a class E−1 oscillator and a class E oscillator, and
• wherein the first LC resonator circuit comprises a fourth capacitor and a back-coupling transformer, the back-coupling transformer including a primary inductor and a secondary inductor, which are back-coupled to each other, the fourth capacitor being connected in parallel to the primary inductor, and one end of the primary inductor being connected to one end of the secondary inductor, and the phase-shifted output voltage being fed back from another end of the secondary inductor to the amplifier element.

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 a phase-shifted output voltage back to the amplifier element, the predetermined phase difference being determined to operate the first oscillator;
• 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 predetermined 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 predetermined 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 predetermined 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,
• wherein the first oscillator is a back-coupling oscillator,
• wherein the second oscillator is any one of a class E−1 oscillator and a class E oscillator, and
• wherein the first LC resonator circuit comprises a fourth capacitor and a back-coupling transformer, the back-coupling transformer including a primary inductor and a secondary inductor, which are back-coupled to each other, the fourth capacitor being connected in parallel to the primary inductor, and one end of the primary inductor being connected to one end of the secondary inductor, and the phase-shifted output voltage being fed back from another end of the secondary inductor to the amplifier element.