WIRELESS POWER TRANSFER METHOD, APPARATUS AND SYSTEM

• US 20160233728A1
• Filed: 12/01/2014
• Published: 08/11/2016
• Est. Priority Date: 12/01/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Yongcheol, SEO, Jeongkyo, LEE, Seonghun, KWAK, Bongsik, LEE, Jaesung
• Granted Patent: US 10,164,482 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• 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 5/24 Inductive coupling
• CPC Class Codes: H04B 5/26 using coils
• 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
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

The present invention relates to a wireless power transmission method, a wireless power transmission apparatus, and a wireless charging system in a wireless power transmission field, and the wireless power transmission method may include receiving first information of a first wireless power receiver and second information of a second wireless power receiver that receive power in a wireless manner within a first slot among a plurality of slots, transmitting a NAK (not-acknowledge) signal to the first and the second wireless power receiver and executing a collision resolution mechanism in the first and the second wireless power receiver.

Claims

1. A communication method of a wireless power transmitter for transmitting power in a wireless manner, the communication method comprising:

receiving first information of a first wireless power receiver and second information of a second wireless power receiver that receive power in a wireless manner within a first slot among a plurality of slots;

transmitting a NAK (not-acknowledge) signal to the first and the second wireless power receiver; and

executing a collision resolution mechanism in the first and the second wireless power receiver.

2. The communication method of claim 1, wherein the first slot is not allocated to the first and the second wireless power receiver that have received the NAK signal.

3. The communication method of claim 2, wherein the first signal is received within a second slot different from the first slot among a plurality of slots from the first wireless power receiver subsequent to executing the collision resolution mechanism.

4. The communication method of claim 3, wherein an ACK signal is transmitted to the firsts wireless power receiver when the second slot is allocatable.

5. The communication method of claim 4, wherein a NAK signal is transmitted to the first wireless power receiver when the second slot is in a non-allocatable state.

6. The communication method of claim 3, wherein the second slot is allocated to the first wireless power receiver when the first signal is received within the second slot.

7. The communication method of claim 6, wherein the wireless power transmitter performs communication with the first wireless power receiver within the second slot.

8. The communication method of claim 3, wherein the second wireless power receiver is allocated to the third slot when the second signal is received within a third slot different from the first and the second slot.

9. The communication method of claim 8, wherein the wireless power transmitter performs communication with the second wireless power receiver through the third slot when the third slot is allocated thereto.

10. The communication method of claim 1, further comprising:

transmitting a FSK signal to a first and a second wireless power receiver.

11. The communication method of claim 1, wherein the wireless power transmitter performs communication with the first and the second wireless power receiver in a time division multiplexing scheme using the plurality of slots.

12. A wireless power transmitter for transmitting power in a wireless manner, the wireless power transmitter comprising:

a power transmission unit configured to transmit power in a wireless manner; and

a power transmission controller configured to receive a first signal of a first wireless power receiver and a second signal of a second wireless power receiver that receive power in a wireless manner within a first slot among a plurality of slots, and transmit a NAK signal to the first and the second wireless power receiver.

13. The wireless power transmitter of claim 12, wherein the power transmission controller allocates the second slot to the first wireless power receiver when a first signal is received within a second slot different from the first slot subsequent to transmitting the NAK signal.

14. The wireless power transmitter of claim 13, wherein the power transmission controller transmits an ACK signal to the first wireless power receiver when a first signal is received within the second slot.

15. The wireless power transmitter of claim 13, wherein the third slot is allocated to the second wireless power receiver when a second signal is received within a third slot different from the first and the second slot subsequent to transmitting the NAK signal.

16. A wireless charging system, comprising:

a transmitter formed to transmit wireless power; and

a first and a second receiver formed to receive wireless power from the transmitter,

wherein the transmitter transmits a NAK signal to the first and the second receiver when a first signal received from the first receiver and a second signal received from the second receiver are received within a first slot among a plurality of slots, and

the first and the second receiver executes a collision resolution mechanism upon receiving the NAK signal.

17. The wireless charging system of claim 16, wherein the first receiver transmits a first signal to the transmitter through a second slot different from the first slot subsequent to executing the collision resolution mechanism, and

the transmitter allocates the second slot to the first receiver when a first signal is transmitted within the second slot.

18. The wireless charging system of claim 17, wherein the transmitter transmits an ACK signal to the first receiver when the second slot is allocated to the first receiver.

19. The wireless charging system of claim 18, wherein the first receiver performs communication with the transmitter using the second slot when the second slot is allocated to the first receiver.

20. The wireless charging system of claim 16, wherein the transmitter transmits a FSK signal to the first and the second receiver.