WIRELESS POWER RECEIVER AND CONTROL METHOD THEREOF

• US 20130113422A1
• Filed: 10/23/2012
• Published: 05/09/2013
• Est. Priority Date: 11/04/2011
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: LEE, Ki Min, LEE, Jung Oh
• Granted Patent: US 9,461,364 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: G06K 19/0708 the source being electromagnetic or magnetic
• CPC Class Codes: G06K 19/0715 the arrangement including means to regulate power transfer to the integrated circuit
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• 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 50/70 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 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power receiver according to an embodiment wirelessly receives power from a wireless power transmitter. The wireless power receiver includes a printed circuit board having a reception space in a predetermined area, a receiving coil disposed in the reception space of the printed circuit board for receiving power from the wireless power transmitter, and a short-range communication antenna disposed on the printed circuit board while surrounding the receiving coil.

Claims

1. A wireless power receiver which wirelessly receives power from a wireless power transmitter, the wireless power receiver comprising:

a printed circuit board having a reception space in a predetermined area;

a receiving coil disposed in the reception space of the printed circuit board for receiving power from the wireless power transmitter; and

a short-range communication antenna disposed on the printed circuit board while surrounding the receiving coil.

2. The wireless power receiver of claim 1, further comprising a shielding unit for shielding a magnetic field generated from the receiving coil.

3. The wireless power receiver of claim 2, wherein the shielding unit is disposed to include an area occupied by the receiving coil.

4. The wireless power receiver of claim 2, wherein the shielding unit has a reception space in a predetermined area thereof, and

the wireless power receiver further comprises a wireless charging circuit disposed in the reception space of the shielding unit to transfer rectified power to a load by rectifying power received from the receiving coil.

5. The wireless power receiver of claim 4, wherein the wireless charging circuit has a thickness equal to or less than a thickness of the shielding unit.

6. The wireless power receiver of claim 1, wherein the receiving coil has a thickness equal to or less than a thickness of the printed circuit board.

7. The wireless power receiver of claim 1, wherein the reception space is configured in match with the receiving coil.

8. The wireless power receiver of claim 1, wherein the short-range communication antenna is disposed in the printed circuit board.

9. The wireless power receiver of claim 1, wherein the short-range communication antenna includes an NFC (Near Field Communication) antenna.

10. A wireless power receiver which wirelessly receives power from a wireless power transmitter, the wireless power receiver comprising:

a short-range communication antenna for performing short-range communication;

a receiving coil for wirelessly receiving power from the wireless power transmitter; and

a switch for changing a conducting state of the short-range communication antenna according to reception of the power,

wherein the wireless power receiver opens or shorts the switch according to the reception of the power.

11. The wireless power receiver of claim 10, wherein the short-range communication antenna surrounds the receiving coil.

12. The wireless power receiver of claim 10, wherein the wireless power receiver opens the switch when the power is received and shorts the switch when the power is not received.

13. The wireless power receiver of claim 10, further comprising a short-range communication module which receives a current from the short-range communication antenna.

14. The wireless power receiver of claim 10, further comprising a protecting unit for changing a current flowing direction when a current flowing through the short-range communication antenna is equal to or greater than a threshold current value.

15. The wireless power receiver of claim 14, wherein the protecting unit includes at least one zener diode.

16. A method of controlling a wireless power receiver which includes a short-range communication antenna for communicating with an outside, the method comprising:

determining whether power is received from a transmitting coil through electromagnetic induction;

opening a switch, which changes a conducting state of the short-range communication antenna, when the power is received;

identifying whether an amount of received power is equal to or greater than a threshold value; and

shorting the switch when the amount of the received power is equal to or greater than the threshold value.

17. The method of claim 16, further comprising:

opening the switch when the amount of the received power is less than the threshold value.

18. The method of claim 16, further comprising:

changing a flowing direction of a current when the current flowing through the short-range communication antenna is equal to or greater than a threshold current value.

19. The method of claim 18, wherein the changing of the current flowing direction includes changing the current flowing direction by using a zener diode.

20. The method of claim 16, wherein the short-range communication antenna includes an NFC (Near Field Communication) antenna.