CONTACTLESS POWER TRANSMISSION DEVICE

• US 20150263528A1
• Filed: 07/10/2013
• Published: 09/17/2015
• Est. Priority Date: 08/10/2012
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Kitamura, Hiroyasu, Suzuki, Mami, Ohba, Takafumi
• Application Number:
  US14/418,073
• Publication Number:
  US 20150263528A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• 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 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A contactless power transmission device is provided with: a washstand that includes a primary coil; and an electric toothbrush that includes a secondary coil, a rectifier circuit, and a feed control unit. The electric toothbrush includes a first auxiliary coil which relays a magnetic flux which flows from the primary coil to the secondary coil, and a second auxiliary coil which relays a magnetic flux which flows from the primary coil to the secondary coil. A central axis of the second auxiliary coil is perpendicular to a central axis of the first auxiliary coil.

Claims

1. A contactless power transmission device comprising:

a power transmitter that includes a primary coil; and

a power receiver that includes a secondary coil and a power supply circuit electrically connected to the secondary coil, wherein

the power receiver includes

a first auxiliary coil that relays magnetic flux flowing from the primary coil to the secondary coil, and

a second auxiliary coil that is separate from the first auxiliary coil and relays magnetic flux flowing from the primary coil to the secondary coil, wherein

the second auxiliary coil is located where a center axis of the second auxiliary coil is inclined relative to a center axis of the first auxiliary coil or skew relative to the center axis of the first auxiliary coil.

2. The contactless power transmission device according to claim 1, wherein

the first auxiliary coil is not electrically connected to the secondary coil and the power supply circuit, and

the second auxiliary coil is not electrically connected to the secondary coil, the power supply circuit, and the first auxiliary coil.

3. The contactless power transmission device according to claim 1, wherein

at least one of the secondary coil, the first auxiliary coil, and the second auxiliary coil includes a hollow portion and a core that is located in the hollow portion and formed by a magnetic material.

4. The contactless power transmission device according to claim 3, wherein

one of the first auxiliary coil and the second auxiliary coil includes a wire that is wound around the core, and

the other of the first auxiliary coil and the second auxiliary coil includes a planar coil.

5. The contactless power transmission device according to claim 3, wherein

the core includes

a first projection, and

a second projection having a center axis located at a position that is inclined relative to a center axis of the first projection or skew relative to the center axis of the first projection,

the first auxiliary coil includes a first wire that is wound around the first projection, and

the second auxiliary coil includes a second wire that is wound around the second projection.

6. The contactless power transmission device according to claim 3, wherein the core includes

a central portion,

a first projection formed extending from the central portion, and

a second projection formed extending from the central portion to have a center axis that is deviated from an axis parallel to a center axis of the first projection.

7. The contactless power transmission device according to claim 1, wherein the first auxiliary coil and the second auxiliary coil include planar coils.

8. The contactless power transmission device according to claim 1, wherein at least one of the first auxiliary coil and the second auxiliary coil includes a curved coil that is formed by bending a planar coil to have a curved surface.

9. The contactless power transmission device according to claim 1, wherein at least one of the first auxiliary coil and the second auxiliary coil includes a conductive pattern that is formed on a circuit board.

10. The contactless power transmission device according to claim 9, wherein the power supply circuit is formed on the circuit board.

11. The contactless power transmission device according to claim 1, wherein one of a center axis of the first auxiliary coil and a center axis of the second auxiliary coil is coaxial to a center axis of the secondary coil.