POWER TRANSMISSION SYSTEM

• US 20150280445A1
• Filed: 10/29/2013
• Published: 10/01/2015
• Est. Priority Date: 10/31/2012
• Status: Active Grant

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Inventors: Yamakawa, Hiroyuki, Sato, Kenichiro
• Granted Patent: US 10,110,067 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2250/12 by confirmation, e.g. of the input
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• 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: B60L 53/305 Communication interfaces
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/363 made of electrically conductive material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A power transmission system that can prevent a plunge in power transmission efficiency even when there is a positional shift of a power reception antenna with respect to a power transmission antenna. A power transmission system includes: a power transmission antenna that includes a wound power transmission coil that is placed on the ground; a power reception antenna that is disposed in such a way as to face the power transmission antenna, includes a wound power reception coil, and receives electric energy from the power transmission antenna via an electromagnetic field, wherein an area of a first projection plane that is formed by the power transmission coil in a vertical direction with respect to a horizontal plane is larger than an area of a second projection plane that is formed by the power reception coil in the vertical direction with respect to the horizontal plane.

Claims

1. A power transmission system comprising:

a power transmission antenna that includes a wound power transmission coil that is placed on the ground; and

a power reception antenna that is disposed in such a way as to face the power transmission antenna, includes a wound power reception coil, and receives electric energy from the power transmission antenna via an electromagnetic field, wherein

an area of a first projection plane that is formed by the power transmission coil in a vertical direction with respect to a horizontal plane is larger than an area of a second projection plane that is formed by the power reception coil in the vertical direction with respect to the horizontal plane.

2. The power transmission system according to claim 1, wherein

when a distance between inner edges of the power transmission coil in a predetermined direction is represented by T_i, a distance between outer edges of the power transmission coil by T_o, a distance between inner edges of the power reception coil by R_i, and a distance between outer edges of the power reception coil by R_o, there is relation T_i<

R_i<

R_o<

T_o.

3. The power transmission system according to claim 2, wherein

the predetermined direction is a direction perpendicular to a direction in which a positional shift occurs between the power reception antenna and the power transmission antenna.