Communication method and apparatus in wireless recharging system

• US 9,054,547 B2
• Filed: 09/05/2012
• Issued: 06/09/2015
• Est. Priority Date: 09/06/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Byun, Kang-Ho, Park, Se-Ho, Lee, Kyung-Woo
• Primary Examiner(s): Vuong, Quochien B
• Application Number:
  US13/604,000
• Publication Number:
  US 20130065518A1
• Time in Patent Office: 1,007 Days
• Field of Search: 455/39, 455/41.1, 455/41.2, 455/572, 455/573, 320/108, 307/104
• 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

Abstract

A method of performing communication between a wireless power transmitter and a wireless power receiver, which includes performing load detection by detecting wireless power provided by the wireless power transmitter being applied to the wireless power receiver; setting up a common channel having a predetermined first frequency for establishing a connection with the wireless power receiver, which is performed by the wireless power transmitter; establishing the connection with the wireless power receiver using the common channel; determining, from among available channels, a selection channel having an optimal condition for communicating with the wireless power receiver and a predetermined second frequency through use of the common channel; and performing data transmission and reception with the wireless power receiver through the selection channel.

Claims

1. A method, of performing communication between a wireless power transmitter and a wireless power receiver, comprising:

performing load detection by detecting wireless power provided by the wireless power transmitter being applied to the wireless power receiver;

setting up a common channel having a predetermined first frequency for establishing a connection with the wireless power receiver, which is performed by the wireless power transmitter;

establishing the connection with the wireless power receiver using the common channel;

determining, from among available channels, a selection channel having an optimal condition for communicating with the wireless power receiver and a predetermined second frequency through use of the common channel; and

performing data transmission and reception with the wireless power receiver through the selection channel,

wherein determining the selection channel comprises;

broadcasting, by the wireless power transmitter, a broadcast message including information for determining the wireless power receiver and the selection channel; and

receiving, by the wireless power transmitter, from the wireless power receiver, a response indicating that the wireless power transmitter has optimal conditions for communicating with the wireless power receiver.

2. The method of claim 1, wherein the broadcast message includes an identifier of the wireless power transmitter and the selection channel supported by the wireless power transmitter.

3. The method of claim 1, wherein determining the selection channel comprises:

receiving search messages having information for determining the wireless power receiver and the selection channel from a plurality of wireless power receivers;

selecting a wireless power receiver having the optimal communication condition from among the plurality of wireless power receivers; and

transmitting, to the selected wireless power receiver, a response indicating that the wireless power receiver has the optimal communication condition.

4. The method of claim 3, wherein the optimal communication condition is determined according to a communication environment in which the search message is received.

5. A method of communicating between a wireless power transmitter and a wireless power receiver, comprising:

supplying wireless power received from the wireless power transmitter to the wireless power receiver;

setting up a common channel having a predetermined first frequency for establishing a connection with the wireless power transmitter;

establishing the connection with the wireless power transmitter using the common channel;

determining, from among available channels, a selection channel having an optimal condition for communicating with the wireless power transmitter and a predetermined second frequency through use of the common channel; and

performing data transmission and reception with the wireless power transmitter through the selection channel,

wherein determining the selection channel comprises;

receiving, by the wireless power receiver, through the common channel, a broadcast message from the wireless power transmitter having information for determining the wireless power receiver and the selection channel;

selecting, from among a plurality of wireless power transmitters, a wireless power transmitter having an optimal condition for communication; and

transmitting, in response to the broadcast message, a response message to the selected wireless power transmitter.

6. The method of claim 5, wherein the broadcast message includes an identifier of the wireless power transmitter and the selection channel supported by the wireless power transmitter.

7. The method of claim 5, wherein determining the selection channel comprises:

transmitting, by the wireless power receiver, a search message having information for determining the wireless power receiver and the selection channel to at least one wireless power transmitter; and

receiving, by the wireless power receiver, from the wireless power transmitter, a response message indicating the wireless power transmitter and the selection channel having the optimal condition for communication, which is determined by the wireless power transmitter.

8. The method of claim 7, wherein the optimal condition is determined according to a communication environment in which the search message is received.

9. A wireless power transmitter for wirelessly transmitting power, comprising:

a power supply for supplying power;

a resonator for creating a Radio Frequency (RF) field and wirelessly providing the supplied power through the RF field to a wireless receiver;

a sensor unit for detecting a change in power provided by the resonator and informing a controller of whether the wireless power receiver is receiving the power;

a communication unit for communicating with the wireless power receiver through a common channel having a predetermined first frequency and a selection channel having a predetermined second frequency; and

the controller for controlling the communication unit to set up the common channel in response to a confirmation that the wireless power receiver is receiving the power, determining the selection channel using transmitted/received data on the common channel, and controlling the communication unit to set up the selection channel,

wherein the controller provides, to the communication unit, information for determining the wireless power receiver and the selection channel, controls the communication unit to broadcast a message including the information for determining the wireless power receiver and the selection channel, checks a response received from the wireless power receiver, and configures the selection channel to communicate with the wireless power receiver.

10. The wireless power transmitter of claim 9, wherein the information for determining the wireless power receiver and the selection channel includes an identifier of the wireless power transmitter and the selection channel supported by the wireless power transmitter.

11. The wireless power transmitter of claim 9, wherein the controller checks a search message received from the communion unit that includes information for determining the wireless power receiver and the selection channel, determines, from among a plurality of wireless power receivers, a wireless power receiver having an optimal condition for communication, and controls the communication unit to transmit a response indicating that the determined wireless power receiver has the optimal condition for communication.

12. The wireless power transmitter of claim 11, wherein the optimal condition is determined according to a communication environment in which the search message is received.

13. A wireless power receiver for wirelessly receiving power, comprising:

a resonator for receiving a Radio Frequency (RF) field provided by a wireless power transmitter;

a power converter for converting the RF field received by the resonator into power useable by the wireless power receiver;

a communication unit for communicating with the wireless power transmitter through a common channel having a predetermined first frequency and a selection channel having a predetermined second frequency; and

a controller for controlling the communication unit to set up the common channel, determining the selection channel, using transmitted/received data on the common channel, and controlling setup of the selection channel,

wherein the controller selects, from among a plurality of wireless power transmitters, one of the wireless power transmitters having an optimal condition for communication, in response to receiving from each the plurality of wireless power transmitters, a broadcast message that includes information for determining the wireless power transmitter and the selection channel, and controls the communication unit to transmit a response message to the selected wireless power transmitter on the common channel in response to the broadcast message.

14. The wireless power receiver of claim 13, wherein information for determining the selected wireless power transmitter and the selection channel includes an identifier of the wireless power transmitter and the selection channel supported by the wireless power transmitter.

15. The wireless power receiver of claim 13, wherein the controller

generates a search message having information for determining the wireless power receiver and the selection channel, controls the communication unit to transmit the search message to the wireless power transmitter on the common channel, receives a response message indicating the wireless power receiver and a selection channel having the optimal condition for communication, which are determined by the wireless power transmitter, and controls the communication unit to set up the selection channel according to the received response message.

16. The wireless power receiver of claim 15, wherein the optimal condition is determined according to a communication environment in which the search message is received.