Power feeding device and contactless power feeding system provided with power feeding device

A power receiving device comprising:

• a load;
• a reception coil electrically connected to the load;
• a second resonant coil configured to perform electromagnetic induction coupling with the reception coil;
• a second transmission/reception circuit;
• a second control circuit electrically connected to the second transmission/reception circuit;
• and
• a moving unit electrically connected to the second control circuit,
• wherein the power receiving device is configured to perform electromagnetic resonance coupling with a power feeding device comprising:
• a high-frequency power source;
• a transmission coil electrically connected to the high-frequency power source;
• a first resonant coil;
• a detector;
• a first control circuit electrically connected to the detector;
• and
• a first transmission/reception circuit electrically connected to the first control circuit,
• wherein the high-frequency power source is configured to output an electric power through the transmission coil to the reception coil,
• wherein the first resonant coil is configured to perform electromagnetic induction coupling with the transmission coil,
• wherein the detector is configured to detect a reflection component of the electric power reflected at the transmission coil and output a signal in according with intensity of a parameter showing the reflection component,
• wherein the first control circuit is configured to receive the signal in accordance with the intensity of the parameter from the detector and transmit the signal to the first transmission/reception circuit,
• wherein the first transmission/reception circuit is configured to receive the signal from the first control circuit and transmit the signal to the second transmission/reception circuit,
• wherein the second transmission/reception circuit is configured to receive the signal from the first transmission/reception circuit and transmit the signal to the second control circuit,
• wherein the second control circuit is configured to output a signal relating to transfer to the moving unit, and
• wherein the moving unit is configured to control a distance between the reception coil and the second resonant coil in accordance with the signal relating to transfer output from the second control circuit.

A contactless power feeding system comprising:

• a power feeding device;
• and
• a power receiving device,
• wherein the power feeding device comprises:
• a high-frequency power source;
• a transmission coil electrically connected to the high-frequency power source;
• a first resonant coil;
• a detector;
• a first control circuit electrically connected to the detector;
• and
• a first transmission/reception circuit electrically connected to the first control circuit,
• wherein the power receiving device comprises:
• a load;
• a reception coil electrically connected to the load;
• a second resonant coil configured to perform electromagnetic induction coupling with the reception coil;
• a second transmission/reception circuit;
• a second control circuit electrically connected to the second transmission/reception circuit;
• and
• a moving unit electrically connected to the second control circuit,
• wherein the power feeding device is configured to perform electromagnetic resonance coupling with the power receiving device,
• wherein the high-frequency power source is configured to output an electric power through the transmission coil,
• wherein the first resonant coil is configured to perform electromagnetic induction coupling with the transmission coil,
• wherein the detector is configured to detect a reflection component of the electric power reflected at the transmission coil,
• wherein the first control circuit is configured to output a signal in accordance with the reflection component of the electric power to the first transmission/reception circuit,
• wherein the first transmission/reception circuit is configured to transmit the signal to the second transmission/reception circuit,
• wherein the second transmission/reception circuit is configured to output the signal to the second control circuit,
• wherein the second control circuit is configured to output a signal relating to transfer to the moving unit, and
• wherein the moving unit is configured to control one of a position of the reception coil and a position of the second resonant coil in accordance with the signal relating to transfer output from the second control circuit.