Wireless power receiver, terminal and wireless power transmitter

• US 9,887,030 B2
• Filed: 01/26/2015
• Issued: 02/06/2018
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Dong Hyuk, Song, Ji Yeon
• Primary Examiner(s): Gannon, Levi
• Application Number:
  US14/605,627
• Publication Number:
  US 20150213933A1
• Time in Patent Office: 1,107 Days
• Field of Search: 307104, 320108, 320137
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 7/0231 Magnetic circuits with PM for power or force generation
• CPC Class Codes: H01F 7/0252 PM holding devices H01F7/021, H01F7/0215, H01F7/0226 take precedence
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction

Abstract

A wireless power receiver includes a coil to receive the power; and a magnet to generate an intensity of a magnetic flux density sensed by a sensor of the wireless power transmitter. The coil has an empty central region. The magnet is disposed in the empty central region of the coil. The magnet includes an electric steel sheet.

Claims

1. A wireless power receiver for wirelessly receiving power from a wireless power transmitter, the wireless power receiver comprising:

a coil to receive the power;

an electric steel sheet to generate an intensity of a magnetic flux density sensed by a sensor of the wireless power transmitter;

a shielding member disposed on an upper surface of the coil and an upper surface of the electric steel sheet; and

a printed circuit board disposed on the shielding member, wherein electronic components including a power source, an AC power generating unit, and a control unit are mounted on the printed circuit board,

wherein the coil has an empty central region,

wherein the electric steel sheet is disposed in the empty central region of the coil,

wherein the coil and the electric steel sheet are disposed on a same surface,

wherein the coil surrounds the electric steel sheet, and

wherein the coil and the electric steel sheet are adhered to a back surface of the shielding member by an adhesive.

2. The wireless power receiver of claim 1, wherein the intensity of the magnetic flux density is equal to or greater than 32 Gauss.

3. The wireless power receiver of claim 1, wherein the electric steel sheet contains silicon (Si) in a range of 1% to 5%.

4. The wireless power receiver of claim 1, wherein the electric steel sheet has a diameter in a range of 8 mm to 12 mm.

5. The wireless power receiver of claim 1, wherein the shielding member is between the upper surface of the electric steel sheet and the printed circuit board.

6. A terminal for wirelessly receiving power from a holder, the terminal comprising:

a cover facing the holder;

a coil disposed on the cover to receive the power;

an electric steel sheet to generate an intensity of a magnetic flux density sensed by a sensor of the holder;

a shielding member disposed an upper surface of the coil and an upper surface of the electric steel sheet; and

a printed circuit board disposed on the shielding member, wherein electronic components including a power source, an AC power generating unit, and a control unit are mounted on the printed circuit board,

wherein the electric steel sheet is surrounded with the coil, disposed in a central region of the coil,

wherein the coil and the electric steel sheet are disposed on a same surface, and

wherein the coil and the electric steel sheet are adhered to a back surface of the shielding member by an adhesive.

7. The terminal of claim 6, wherein the intensity of the magnetic flux density of the electric steel sheet is equal to or greater than 32 Gauss.

8. The terminal of claim 6, wherein the electric steel sheet contains silicon (Si) in a range of 1% to 5%.

9. The terminal of claim 6, wherein the cover has a thickness in a range of 0.5 mm to 0.8 mm.

10. The terminal of claim 6, wherein the electric steel sheet has a diameter in a range of 8 mm to 12 mm.

11. The terminal of claim 6, wherein the coil includes one of a winding coil structure and a lead frame coil structure.

12. A wireless power transmitter comprising:

a power source;

an AC power generating unit to receive power from the power source to generate AC power;

a transmission coil to transmit the AC power generated from the AC power generating unit to a wireless power receiver;

a first magnet in a central region of the transmission coil;

a sensor to provide a first voltage signal corresponding to a magnetic flux density of the first magnet and a second voltage signal corresponding to the magnetic flux density of the first magnet and a magnetic flux density of a second magnet of the wireless power receiver; and

a control unit that controls the transmission coil to transmit the AC power when a variation degree between the first and second voltage signals is equal to or greater than a threshold value.

13. The wireless power transmitter of claim 12, wherein the control unit receives electric signals corresponding to each of the magnetic flux densities of the electric steel sheet of the wireless power receiver and the first magnet sensed by the sensor.

14. The wireless power transmitter of claim 13, wherein the control unit is switched from a sleep mode to a wake-up mode in response to the electric signals.

15. The wireless power transmitter of claim 13, wherein the control unit controls the AC power generating unit in response to the electric signals.

16. The wireless power transmitter of claim 12, wherein an intensity of the magnetic flux density of the electric steel sheet is equal to or greater than 32 Gauss.