METHOD AND APPARATUS FOR CONTROLLING WIRELESS POWER TRANSMISSION AND RECEPTION, AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20120202435A1
• Filed: 02/06/2012
• Published: 08/09/2012
• Est. Priority Date: 02/07/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Nam Yun, Kwon, Sang Wook, Park, Yun Kwon, Park, Eun Seok, Hong, Young Tack, Kim, Ki Young, Ryu, Young Ho, Kim, Dong Zo, Choi, Jin Sung
• Granted Patent: US 9,160,421 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• 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 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Provided are a transmission system and a wireless power transmission and reception controlling method. According to an embodiment, a wireless power receiver may include: a target communication unit configured to receive, from a wireless power transmitter, a wake-up request signal and synchronization information with respect to wireless power transmission, and to transmit a response signal with respect to the wake-up request signal to the wireless power transmitter; a load path switch configured to activate based on timing information included in the synchronization information; and a target resonator configured to receive wireless power from a source resonator of the wireless power transmitter, when the load path switch is activated.

Claims

1. A wireless power receiver comprising:

a target communication unit configured to receive, from a wireless power transmitter, a wake-up request signal and synchronization information with respect to wireless power transmission, and to transmit a response signal with respect to the wake-up request signal to the wireless power transmitter;

a load path switch configured to activate based on timing information included in the synchronization information; and

a target resonator configured to receive wireless power from a source resonator of the wireless power transmitter, when the load path switch is activated.

2. The wireless power receiver of claim 1, wherein the response signal includes identification information associated with the wireless power receiver and information associated with a charge level.

3. The wireless power receiver of claim 1, further comprising:

a matching controller configured to perform an impedance matching between the target resonator and the load or between the source resonator and the target resonator.

4. The wireless power receiver of claim 1, further comprising:

a resonance switch that is included between the target resonator and the power supply and that is configured to activate based on the timing information included in the synchronization information.

5. The wireless power receiver of claim 1, further comprising:

a controller configured to calculate a power transmission efficiency of power wirelessly received from the wireless power transmitter, and to transmit the power transmission efficiency to the wireless power transmitter via the target communication unit.

6. The wireless power receiver of claim 1, wherein:

the timing information included in the synchronization information includes information associated with timing sections allocated to each of a plurality of wireless power receivers; and

the timing sections are dynamically allocated based on a charge level of each of the plurality of wireless power receivers or based on a power transmission efficiency with respect to each of the plurality of wireless power receiver.

7. A wireless power transmitter comprising:

a source communication unit configured to transmit, to a plurality of wireless power receivers, a wake-up request signal and synchronization information with respect to wireless power transmission, and to receive, from the plurality of power receivers, response signals with respect to the wake-up request signal;

a power generating unit configured to generate power to be transmitted to the wireless power receivers; and

a source resonator configured to wirelessly transmit the generated power to each of the plurality of target resonators.

8. The wireless power transmitter of claim 7, further comprising:

a controller configured to recognize a number of the wireless power receivers based on identification information included in each of the response signals, and to generate the synchronization information based on the number of the wireless power receivers.

9. The wireless power transmitter of claim 8, wherein the controller is configured to monitor power transmission efficiency of the wirelessly transmitted power, and to adjust a resonance frequency of the source resonator based on a result of monitored power transmission efficiency.

10. The wireless power transmitter of claim 7, further comprising:

a matching controller configured to perform an impedance matching between the source resonator and the power generating unit.

11. The wireless power transmitter of claim 7, wherein:

timing information included in the synchronization information includes information associated with timing sections allocated to each of the plurality of wireless power receivers; and

the timing sections are dynamically allocated based on a charge level of each of the plurality of wireless power receivers or based on a power transmission efficiency with respect to each of the plurality of wireless power receivers.

12. A wireless power reception controlling method of a wireless power receiver, the method comprising:

receiving a wake-up request signal from a wireless power transmitter;

transmitting, to the wireless power transmitter, a response signal with respect to the wake-up request signal;

receiving, from the wireless power transmitter, synchronization information with respect to wireless power transmission; and

switching a connection to a load or a target resonator, based on timing information included in the synchronization information.

13. The method of claim 12, wherein the response signal includes identification information of the wireless power receiver and information associated with a charge level.

14. The method of claim 12, further comprising:

detecting a reflected wave or a change in an impedance of the load, and

controlling a resonance frequency or an impedance matching.

15. The method of claim 12, wherein:

the timing information included in the synchronization information timing sections allocated to each of a plurality of wireless power receivers; and

the timing sections are dynamically allocated based on a charge level of each of the plurality of power receivers or based on a power transmission efficiency with respect to each of the plurality of wireless power receivers.

16. The method of claim 12, wherein the target resonator forms a magnetic coupling with a source resonator when the connection of the load or the target resonator is switched.

17. A wireless power transmission controlling method of a wireless power transmitter, the method comprising:

broadcasting a wake-up request signal;

receiving, from a plurality of wireless power receivers, response signals with respect to the broadcasted wake-up request signal;

generating synchronization information to be used for wirelessly transmitting power to the plurality of wireless power receivers;

broadcasting the synchronization information; and

forming, based on timing information included in the synchronization information, a wireless connection with a target resonator of each of the plurality of wireless power receivers, and wirelessly transmitting power to each of the plurality of target resonators.

18. The method of claim 17, wherein the generating of the synchronization information comprises:

determining a number of the wireless power receivers based on identification information included in each of the response signals, and

generating the synchronization information based on the number of the wireless power receivers.

19. The method of claim 17, wherein:

the timing information included in the synchronization information includes information associated with timing sections allocated to each of the plurality of wireless power receivers; and

the timing sections are dynamically allocated based on a charge level of each of the plurality of wireless power receivers or based on a power transmission efficiency of each of the plurality of wireless power receivers.

20. The method of claim 17, wherein the timing information included in the synchronization information is transmitted to each of the plurality of wireless power receivers based on a duty cycle time.

21. The method of claim 20, wherein the duty cycle time comprises:

a power duty, a phase duty, or a frequency duty.

22. A wireless power reception method comprising:

receiving a s signal from a wireless power transmitter;

transmitting, to the a wireless power transmitter, a response signal with respect to the received signal;

receiving, from the wireless power transmitter, synchronization information used for wireless power reception.

23. The method of claim 22, further comprising:

switching a wireless connection to a load or a target resonator, based on the synchronization information.

24. The method of claim 22, wherein the response signal includes identification information of the wireless power receiver, information associated with a charge level, or both.