POWER TRANSMISSION SYSTEM AND POWER SUPPLY DEVICE FOR VEHICLES

• US 20120326499A1
• Filed: 01/10/2011
• Published: 12/27/2012
• Est. Priority Date: 01/12/2010
• Status: Active Grant

• Current Assignee: Nagoya Institute of Technology, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nagoya Institute of Technology, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji, Ishikawa, Tetsuhiro, Kikuma, Nobuyoshi, Hirayama, Hiroshi, Sakakibara, Kunio
• Granted Patent: US 9,421,877 B2
• Time in Patent Office: Days
• US Class Current: 307/9.1
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A power transmission system has an AC power source and a high-frequency power driver that make up a high-frequency power source, and a primary self-resonant coil and a secondary self-resonant coil. The secondary self-resonant coil is magnetically coupled, by magnetic field resonance, to the primary self-resonant coil, and receives as a result high-frequency power from the primary self-resonant coil. The coils of the primary self-resonant coil and the secondary self-resonant coil resonate in an even mode when high-frequency power is transmitted from the primary self-resonant coil to the secondary self-resonant coil. Specifically, the primary self-resonant coil and the secondary self-resonant coil resonate in a state where currents in mutually opposite directions flow in the two coils.

Claims

1-5. -5. (canceled)

6. A power transmission system, comprising:

a high-frequency power source that generates high-frequency power;

a first coil that receives the high-frequency power generated by the high-frequency power source; and

a second coil that receives, by being magnetically coupled to the first coil through magnetic field resonance, the high-frequency power from the first coil, wherein

a frequency of the high-frequency power and a parameter relating to the first and second coils are selected such that the first and second coils resonate in a state where currents in mutually opposite directions flow in the first and second coils when the high-frequency power is transmitted from the first coil to the second coil.

7. The power transmission system according to claim 6, further comprising:

a first current sensor configured to be capable of detecting the direction of a first current flowing in the first coil,

a second current sensor configured to be capable of detecting the direction of a second current flowing in the second coil, and

a control device that modifies at least one of the frequency of the high-frequency power and the parameter such that the direction of the first current as detected by the first current sensor and the direction of the second current as detected by the second current sensor are mutually opposite.

8. The power transmission system according to claim 7, wherein

at least one coil of the first and second coils is configured so that a capacitance value thereof can be modified,

the parameter includes the capacitance value of the at least one coil, and

the control device modifies the capacitance value.

9. The power transmission system according to claim 7, wherein

the high-frequency power source is configured so that the frequency of the high-frequency power can be modified, and

the control device controls the high-frequency power source such that the frequency of the high-frequency power varies.

10. A power supply device for a vehicle, for supplying power to a power storage device installed in the vehicle,

the power supply device comprising the power transmission system according to claim 6.