WIRELESS POWER RECEIVER AND METHOD OF CONTROLLING THE SAME

• US 20150318710A1
• Filed: 11/05/2013
• Published: 11/05/2015
• Est. Priority Date: 12/13/2012
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: LEE, Jung Oh, CHANG, Ki Chul, LEE, Ki Min
• Granted Patent: US 10,008,881 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power receiver to wirelessly receive power from a wireless power transmitter comprises a reception coil to receive the power wirelessly transmitted from the wireless power transmitter through a magnetic field, a frequency detecting unit to detect a frequency band of the power transmitted from the wireless power transmitter and an inductance varying unit to change an inductance of the reception coil according to the detected frequency band.

Claims

1. A wireless power receiver to wirelessly receive power from a wireless power transmitter, the wireless power receiver comprising:

a reception coil to receive the power wirelessly transmitted from the wireless power transmitter through a magnetic field;

a frequency detecting unit to detect a frequency band of the power transmitted from the wireless power transmitter; and

an inductance varying unit to change an inductance of the reception coil according to the detected frequency band,

wherein the frequency band of the power transmitted from the wireless power transmitter comprises a first frequency band and a second frequency band, and the first frequency band is lower than the second frequency band.

3. The wireless power receiver of claim 1, wherein the frequency detecting unit detects the frequency band of the power transmitted from the wireless power transmitter by determining a power receiving state of the wireless power receiver through in-band communication.

4. The wireless power receiver of claim 3, wherein the frequency detecting unit determines the frequency band of the power transmitted from the wireless power transmitter through out-of-band communication if the power receiving state of the wireless power receiver is abnormal.

5. The wireless power receiver of claim 4, wherein the inductance varying unit decreases the inductance of the reception coil such that a used frequency band of the wireless power receiver is matched to the second frequency band if the frequency detecting unit determines that the frequency band of the power transmitted from the wireless power transmitter is the second frequency band.

6. The wireless power receiver of claim 5, wherein the frequency band of the power transmitted from the wireless power transmitter further comprises a third frequency band,

the third frequency band is set between the first frequency band and the second frequency band, and

the inductance varying unit changes the inductance of the reception coil so that the used frequency band of the wireless power receiver is matched to the third frequency band if the frequency detecting unit determines that the frequency band of the power transmitted from the wireless power transmitter is the third frequency band.

7. The wireless power receiver of claim 1, wherein the inductance varying unit comprises at least one switch and changes the used frequency band of the wireless power receiver by changing the inductance of the reception coil according to the frequency band transmitted from the wireless power transmitter through an operation of each switch.

8. The wireless power receiver of claim 7, wherein each switch connects or disconnects one terminal of the reception coil to adjust a length of the reception coil, such that the inductance of the reception coil is changed.

9. The wireless power receiver of claim 7, wherein each switch comprises an MEMS switch operating as power is applied thereto.

10. The wireless power receiver of claim 6, wherein the first frequency band is in a range of 110 KHz to 205 KHz, the second frequency band is 6.78 MHz, and the third frequency band is in a range of 206 KHz to 300 KHz.

11. The wireless power receiver of claim 1, wherein the reception coil has one of a spiral structure and a helical structure.

12. The wireless power receiver of claim 1, further comprising a frequency matching unit to match a used frequency band of the wireless power receiver to the frequency band of the power transmitted from the wireless power transmitter according to the changed inductance of the reception coil.

13. The wireless power receiver of claim 12, wherein the frequency matching unit comprises a capacitor connected with the reception coil having the changed inductance.

2. (canceled)

14. A wireless power receiver to wirelessly receive power from a wireless power transmitter, the wireless power receiver comprises:

a reception coil to receive power having a first frequency band from the wireless power transmitter;

a frequency detecting unit to detect if a frequency band of the power transmitted from the wireless power transmitter is the first frequency band; and

an inductance varying unit to change an inductance of the reception coil if the detected frequency band is out of the first frequency band.

15. The wireless power receiver of claim 14, wherein the frequency detecting unit determines the frequency band of the power transmitted from the wireless power transmitter as a second frequency band if the detected frequency band is out of the first frequency band,

the inductance varying unit decreases the inductance of the reception coil such that a used frequency band of the wireless power receiver is matched to the second frequency band, and the first frequency band is lower than the second frequency band.

16. A wireless power receiver to wirelessly receive power from a wireless power transmitter, the wireless power receiver comprises:

a reception coil to receive power having a first frequency band from the wireless power transmitter;

a frequency detecting unit to detect if a frequency band of the power transmitted from the wireless power transmitter is the first frequency band; and

an inductance varying unit to change an inductance of the reception coil if the detected frequency band is out of the first frequency band,

wherein an outer diameter of the reception coil receiving power having the first frequency is 40 mm.

17. The wireless power receiver of claim 16, wherein the frequency detecting unit determines the frequency band of the power transmitted from the wireless power transmitter as a second frequency band if the detected frequency band is out of the first frequency band,

the inductance varying unit decreases the inductance of the reception coil such that a used frequency band of the wireless power receiver is matched to the second frequency band, and the first frequency band is lower than the second frequency band,

wherein an outer diameter of the reception coil receiving power having the second frequency is 20 mm.

18. The wireless power receiver of claim 16, wherein the frequency band of the power transmitted from the wireless power transmitter further comprises a third frequency band,

the third frequency band is set between the first frequency band and the second frequency band, and

the inductance varying unit changes the inductance of the reception coil so that the used frequency band of the wireless power receiver is matched to the third frequency band if the frequency detecting unit determines that the frequency band of the power transmitted from the wireless power transmitter is the third frequency band,

wherein an outer diameter of the reception coil receiving power having the third frequency is 35 mm.

19. The wireless power receiver of claim 16, wherein the reception coil has one of a spiral structure and a helical structure.

20. The wireless power receiver of claim 16, further comprising a frequency matching unit to match a used frequency band of the wireless power receiver to the frequency band of the power transmitted from the wireless power transmitter according to the changed inductance of the reception coil.