CONTACTLESS CONNECTOR SYSTEM TOLERANT OF POSITION DISPLACEMENT BETWEEN TRANSMITTER COIL AND RECEIVER COIL AND HAVING HIGH TRANSMISSION EFFICIENCY

• US 20170092420A1
• Filed: 12/09/2016
• Published: 03/30/2017
• Est. Priority Date: 05/28/2012
• Status: Active Grant

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: HIDAKA, Akio, KIKUI, Toshiaki, ASANUMA, Kenichi, YAMAMOTO, Atsushi, SAKATA, Tsutomu
• Granted Patent: US 10,158,256 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 50/10 using inductive coupling
• 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: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields

Abstract

A contactless connector apparatus is provided with a first coil closely opposed to a second coil so as to be electromagnetically coupled thereto. The first coil includes: an inner transmitter coil wound around an axis passing through its center; and an outer transmitter coil wound around the axis and outside the inner coil. One end of the outer transmitter coil is connected to one end of the inner transmitter coil such that, when a current flows through the transmitter coils, a direction of a loop current generated around the axis by a current flowing through the inner transmitter coil is opposite to that of a loop current generated around the axis by a current flowing through the outer transmitter coil. A self-inductance of the outer transmitter coil is larger than that of the inner transmitter coil.

Claims

1. A power transmission apparatus comprising:

a power receiver circuit; and

a contactless connector apparatus connected to the power receiver circuit,

wherein the contactless connector apparatus comprises a first coil closely opposed to a second coil so as to be electromagnetically coupled to the second coil,

wherein the first coil includes;

an inner coil wound around an axis passing through a center of the first coil; and

an outer coil wound around the axis and outside the inner coil,

wherein one end of the outer coil and one end of the inner coil are connected to each other such that, when a current flows through the first coil, a direction of a loop current generated around the axis by a current flowing through the inner coil is opposite to a direction of a loop current generated around the axis by a current flowing through the outer coil, and

wherein the inner coil and the outer coil are configured such that;

a self-inductance of the outer coil is larger than a self-inductance of the inner coil,

a mutual inductance between the inner coil and the second coil increases as a displacement of the second coil to the first coil increases, the displacement indicating a distance between the center of the first coil and a center of the second coil,

a mutual inductance between the outer coil and the second coil decreases as the displacement of the second coil increases,

when the center of the first coil and the center of the second coil are close to each other, a negative mutual inductance occurs between the inner coil and the second coil, a positive mutual inductance occurs between the outer coil and the second coil, and an absolute value of the mutual inductance between the outer coil and the second coil is larger than an absolute value of the mutual inductance between the inner coil and the second coil,

the displacement of the second coil obtained when the mutual inductance between the outer coil and the second coil is zero is larger than the displacement of the second coil obtained when the mutual inductance between the inner coil and the second coil is zero.