Power transmission device and power reception device

• US 10,763,700 B2
• Filed: 06/29/2018
• Issued: 09/01/2020
• Est. Priority Date: 07/03/2017
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yuasa, Hiroaki
• Primary Examiner(s): Barnie, Rexford N
• Assistant Examiner(s): Vu, Toan T
• Application Number:
  US16/023,301
• Publication Number:
  US 20190006884A1
• Time in Patent Office: 795 Days
• Field of Search: 307104, 320108, 320109
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• 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: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2871 Pancake coils
• 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 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 device includes: a first coil; and a second coil. The first coil and the second coil are configured such that a first current direction and a second current direction are opposite to each other. The first coil includes a first adjacent portion located adjacent to the second coil, and a first spacer portion located on an opposite side of the first adjacent portion. The second coil includes a second adjacent portion located adjacent to the first coil, and a second spacer portion located on an opposite side of the second adjacent portion with respect to the second winding axis. The first adjacent portion is located higher than the first spacer portion.

Claims

1. A power transmission device comprising:

a first coil formed so as to surround a first winding axis extending in an up-down direction;

a second coil formed so as to surround a second winding axis extending in the up-down direction; and

a ferrite plate on which the first coil and the second coil are disposed,

the first coil and the second coil being configured such that a first current direction and a second current direction are opposite to each other during power transmission,

in the first current direction, a current that flows through the first coil flowing so as to be wound around the first winding axis, and

in the second current direction, a current that flows through the second coil flowing so as to be wound around the second winding axis,

the first coil including

a first adjacent portion located adjacent to the second coil, and

a first spacer portion located on an opposite side of the first adjacent portion with respect to the first winding axis,

the second coil including

a second adjacent portion located adjacent to the first coil, and

a second spacer portion located on an opposite side of the second adjacent portion with respect to the second winding axis,

the first adjacent portion being located higher than the first spacer portion,

wherein the ferrite plate includes a first facing portion facing the first adjacent portion and a second facing portion facing the first spacer portion,

wherein at least a part of the first facing portion is thicker than the second facing portion.

2. The power transmission device according to claim 1, wherein a part of the first adjacent portion is formed so as to be away from the second adjacent portion.

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

in a direction in which the first adjacent portion extends, a center portion of the first adjacent portion is farther away from the second adjacent portion than an end of the first adjacent portion is, and

in a direction in which the second adjacent portion extends, a center portion of the second adjacent portion is farther away from the first adjacent portion than an end of the second adjacent portion is.