MAGNETIC SHEET AND NONCONTACT CHARGING SYSTEM USING THE SAME

• US 20140340030A1
• Filed: 05/13/2014
• Published: 11/20/2014
• Est. Priority Date: 05/14/2013
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: JUNG, Chang Ryul, AN, Sung Yong
• Application Number:
  US14/276,553
• Publication Number:
  US 20140340030A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/361 made of combinations of electrically conductive material and ferromagnetic material
• CPC Class Codes: H01F 27/366 made of ferromagnetic 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection

Abstract

Disclosed herein is a magnetic sheet, including: a plate-shaped magnetic member made of a magnetic material; and a dielectric layer installed in the magnetic member to thereby shield magnetic flux generated in a thickness direction of the magnetic member, in order to provide a noncontact charging system having excellent charging efficiency.

Claims

1. A magnetic sheet, comprising:

a plate-shaped magnetic member made of a magnetic material; and

a dielectric layer installed in the magnetic member to thereby shield magnetic flux generated in a thickness direction of the magnetic member.

2. The magnetic sheet according to claim 1, wherein the dielectric layer has the same area as the magnetic member.

3. The magnetic sheet according to claim 1, wherein the dielectric layer is configured of a duplex layer structure of two or more layers.

4. The magnetic sheet according to claim 1, wherein the dielectric layer has a discontinuous pattern.

5. The magnetic sheet according to claim 1, wherein the dielectric layer is configured of a duplex layer structure of two or more layers, the dielectric layer of each layer having a discontinuous pattern.

6. The magnetic sheet according to claim 5, wherein a pattern of the dielectric of a lower layer is disposed so as to correspond to an interval between patterns of the dielectric layer of an upper layer.

7. The magnetic sheet according to claim 1, wherein the dielectric layer is made of at least one material selected from a group consisting of Al₂O₃, SiO₂, TiO₂, ZnO, In₂O₃, NiO, CoO, SnO₂, ZrO₂, CuO, MgO, AlN, BN and SiC, or a compound thereof.

8. The magnetic sheet according to claim 1, wherein the magnetic member is formed by laminating a plurality of magnetic layers.

9. The magnetic sheet according to claim 8, wherein the magnetic layer is made of ferrite.

10. The magnetic sheet according to claim 8, wherein the magnetic layer is made of a mixture of soft magnetic metal powder and resin.

11. The magnetic sheet according to claim 8, wherein the dielectric layer is disposed on any layer in the magnetic member formed by laminating the plurality of magnetic layers.

12. The magnetic sheet according to claim 1, wherein a ratio a/b of a thickness a of the magnetic sheet to a thickness b of the dielectric layer is 12.5% to 25.7%.

13. A noncontact charging system, comprising:

a wireless power transmitting apparatus forming magnetic field through a primary coil included therein at the time of applying an alternating current (AC) voltage; and

a wireless power receiving apparatus generating electromotive force induced from the primary coil at a secondary coil included therein to thereby charge a battery cell,

wherein the magnetic sheet according to any one of claims 1 to 12 is disposed between the battery cell and the secondary coil.