Coil unit, non-contact power transmission device, non-contact power reception device, non-contact power supply system, and vehicle

A coil unit that is provided in a vehicle or in a power supply device for a vehicle, and that performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit, the coil unit comprising

• a secondary resonance coil that electromagnetically resonates with the primary resonance coil, wherein:
• the secondary resonance coil includes a first coil and a second coil;
• the first coil and the second coil have a same number of turns, a same coil diameter, and a same shape, the first coil and the second coil are electrically connected in series, and the first coil and the second coil are disposed in a manner such that directions of generated electric currents are opposite to each other;
• and
• the first coil is disposed adjacent to the second coil on a plane perpendicular to directions of generated magnetic fields.

A coil unit that is provided in a vehicle or in a power supply device for a vehicle, and that performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit, the coil unit comprising

• a secondary resonance coil that electromagnetically resonates with the primary resonance coil, wherein:
• the secondary resonance coil includes a first coil and a second coil;
• the first coil and the second coil have a same number of turns, a same coil diameter, and a same shape, the first coil and the second coil are electrically connected in series, and the first coil and the second coil are disposed in a manner such that phases of generated magnetic fields are opposite to each other;
• and
• the first coil is disposed adjacent to the second coil on a plane perpendicular to directions of the generated magnetic fields.

A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

• a power transmission device;
• and
• a power reception device that is provided in a vehicle, and that faces the power transmission device, wherein:
• the power transmission device includes a primary resonance coil that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the primary resonance coil and the power reception device;
• the primary resonance coil includes a first transmission coil and a second transmission coil;
• the first transmission coil and the second transmission coil have a same number of turns, a same coil diameter, and a same shape, the first transmission coil and the second transmission coil are electrically connected in series, and the first transmission coil and the second transmission coil are disposed in a manner such that directions of magnetic fields generated by electric power supplied from the power source device are opposite to each other;
• the first transmission coil is disposed adjacent to the second transmission coil on a plane perpendicular to the directions of the generated magnetic fields;
• the power reception device includes a secondary resonance coil that is configured to receive electric power from the power transmission device using electromagnetic resonance between the secondary resonance coil and the primary resonance coil;
• the secondary resonance coil includes a first reception coil and a second reception coil;
• the first reception coil and the second reception coil have a same number of turns, a same coil diameter, and a same shape, the first reception coil and the second reception coil are electrically connected in series, and the first reception coil and the second reception coil are disposed in a manner such that directions of magnetic fields generated by electric power received from the power transmission device are opposite to each other;
• and
• the first reception coil is disposed adjacent to the second reception coil on a plane perpendicular to the directions of the generated magnetic fields.

A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

• a power transmission device;
• and
• a power reception device that is provided in a vehicle, and that faces the power transmission device, wherein:
• the power transmission device includes a primary resonance coil that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the primary resonance coil and the power reception device;
• the primary resonance coil includes a first transmission coil and a second transmission coil;
• the first transmission coil and the second transmission coil have a same number of turns, a same coil diameter, and a same shape, the first transmission coil and the second transmission coil are electrically connected in series, and the first transmission coil and the second transmission coil are disposed in a manner such that directions of electric currents generated by electric power supplied from the power source device are opposite to each other;
• the first transmission coil is disposed adjacent to the second transmission coil on a plane perpendicular to directions of generated magnetic fields;
• the power reception device includes a secondary resonance coil that is configured to receive electric power from the power transmission device using electromagnetic resonance between the secondary resonance coil and the primary resonance coil;
• the secondary resonance coil includes a first reception coil and a second reception coil;
• the first reception coil and the second reception coil have a same number of turns, a same coil diameter, and a same shape, the first reception coil and the second reception coil are electrically connected in series, and the first reception coil and the second reception coil are disposed in a manner such that directions of electric currents generated by electric power received from the power transmission device are opposite to each other;
• and
• the first reception coil is disposed adjacent to the second reception coil on a plane perpendicular to directions of generated magnetic fields.

A non-contact power supply system for non-contact transmission of electric power, the non-contact power supply system comprising:

• a power transmission device;
• and
• a power reception device that is provided in a vehicle, and that faces the power transmission device, wherein:
• the power transmission device includes a primary resonance coil that is configured to supply electric power, which has been supplied from a power source device, to the power reception device using electromagnetic resonance between the primary resonance coil and the power reception device;
• the primary resonance coil includes a first transmission coil and a second transmission coil;
• the first transmission coil and the second transmission coil have a same number of turns, a same coil diameter, and a same shape, the first transmission coil and the second transmission coil are electrically connected in series, and the first transmission coil and the second transmission coil are disposed in a manner such that phases of magnetic fields generated by electric power supplied from the power source device are opposite to each other;
• the first transmission coil is disposed adjacent to the second transmission coil on a plane perpendicular to directions of the generated magnetic fields;
• the power reception device includes a secondary resonance coil that is configured to receive electric power from the power transmission device using electromagnetic resonance between the secondary resonance coil and the primary resonance coil;
• the secondary resonance coil includes a first reception coil and a second reception coil;
• the first reception coil and the second reception coil have a same number of turns, a same coil diameter, and a same shape, the first reception coil and the second reception coil are electrically connected in series, and the first reception coil and the second reception coil are disposed in a manner such that phases of magnetic fields generated by electric power received from the power transmission device are opposite to each other;
• and
• the first reception coil is disposed adjacent to the second reception coil on a plane perpendicular to directions of the generated magnetic fields.