Secondary coil module

• US 10,447,081 B2
• Filed: 03/02/2016
• Issued: 10/15/2019
• Est. Priority Date: 04/30/2015
• Status: Active Grant

• Current Assignee: Hosiden Corporation
• Original Assignee: Hosiden Corporation
• Inventors: Ema, Hiroshi, Ohta, Fumio, Sato, Eiji
• Primary Examiner(s): Kik, Phallaka
• Application Number:
  US15/569,316
• Publication Number:
  US 20180123394A1
• Time in Patent Office: 1,322 Days
• Field of Search: 320108, 320113, 320115
• CPC Class Codes: H01F 1/12 of soft-magnetic materials
• CPC Class Codes: H01F 2003/005 Magnetic cores for receiving several windings with perpendicular axes, e.g. for antennae or inductive power transfer
• CPC Class Codes: H01F 3/06 made from wires
• CPC Class Codes: H01F 5/04 Arrangements of electric connections to coils, e.g. leads
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 50/284 with incorporated circuit boards, e.g. printed circuit boards [PCB]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

There is provided a secondary coil module receiving supply of electric power via a primary coil by contactless power transfer technique. The secondary coil module includes a core formed of magnetic material, the core having a tubular portion in the form of a tube and a bottom portion formed integral with the tubular portion in such a manner as to close an opening of the tubular portion formed at one axial end portion thereof, a storage battery accommodated within an accommodation space provided inside the tubular portion and configured to be charged by the power via the primary coil and a coil winding disposed outside the core and on the side of the bottom portion of the core.

Claims

1. A secondary coil module receiving supply of electric power via a primary coil by contactless power transfer technique, the secondary coil module comprising:

a core formed of magnetic material, the core having a tubular portion in the form of a tube and a bottom portion formed integral with the tubular portion in such a manner as to close an opening of the tubular portion formed at one axial end portion thereof;

a storage battery accommodated within an accommodation space provided inside the tubular portion and configured to be charged by the power; and

a coil winding disposed outside the core and on the side of the bottom portion of the core, wherein

the core is formed of resin containing soft magnetic material, and

formation of a gap between the tubular portion and the bottom portion is avoided.

2. The secondary coil module of claim 1, wherein the other axial end portion of the tubular portion of the core is opened, which other axial end portion in turn is closed with a lid member formed of magnetic material.

3. The secondary coil module of claim 2, wherein the coil winding is wound in a spiral form to surround the tubular portion.

4. The secondary coil module of claim 3, wherein the coil winding is wound in a swirl form and disposed in opposition to the bottom portion of the core.

5. The secondary coil module of claim 3, wherein the accommodation space further accommodates a power storage control circuit for controlling charging of the storage battery.

6. The secondary coil module of claim 2, wherein the coil winding is wound in a swirl form and disposed in opposition to the bottom portion of the core.

7. The secondary coil module of claim 2, wherein the accommodation space further accommodates a power storage control circuit for controlling charging of the storage battery.

8. The secondary coil module of claim 1, wherein the coil winding is wound in a spiral form to surround the tubular portion.

9. The secondary coil module of claim 8, wherein the coil winding is wound in a swirl form and disposed in opposition to the bottom portion of the core.

10. The secondary coil module of claim 8, wherein the accommodation space further accommodates a power storage control circuit for controlling charging of the storage battery.

11. The secondary coil module of claim 1, wherein the coil winding is wound in a swirl form and disposed in opposition to the bottom portion of the core.

12. The secondary coil module of claim 1, wherein the accommodation space further accommodates a power storage control circuit for controlling charging of the storage battery.

13. The secondary coil module of claim 1, additionally comprising

a circuit board situated between the storage battery and an inner wall of the tubular portion within the accommodation space, and

a coil winding connecting portion, a storage battery connecting portion and an output terminal forming portion all being electrically connected to the circuit board,

the coil winding portion comprising a pair of electrodes connected to respective ends of the coil winding,

the coil winding portion being bent to be exposed on an outer surface of the core or tubular portion thereof,

the storage battery connecting portion being connected to one of a pair of terminal electrodes of the storage battery,

the output terminal forming portion comprising output terminals, and

the output terminal forming portion being bent to be exposed on the outer surface of the core or tubular portion thereof and connected via the storage battery connecting portion to the pair of terminal electrodes of the storage battery.