METHOD FOR AVOIDING SIGNAL COLLISION IN WIRELESS POWER TRANSFER

• US 20130002038A1
• Filed: 06/29/2012
• Published: 01/03/2013
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jun, Lee, Jaesung, Park, Yongcheol
• Granted Patent: US 9,300,147 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence

Abstract

In a wireless power transmitter, a wireless power receiver, and a signal collision avoiding method disclosed herein, when a new wireless power receiver is placed in a specific area while the wireless power transmitter is performing communication with a specific wireless power receiver, the new wireless power receiver analyzes a response signal formed by the specific wireless power receiver through a listening mode, and transmits its own response signal at a collision-avoided time point, thereby allowing an efficient stable data communication.

Claims

1. A wireless power transmitter comprising:

a power conversion unit configured to form a wireless power signal for power transmission; and

a power transmission control unit configured to control the power conversion unit to receive a first response signal from a first wireless power receiver, the first response signal corresponding to the wireless power signal, and to receive a second response signal from a second wireless power receiver, the second response signal avoiding collision with the first response signal,

wherein the second wireless power receiver receives the first response signal, detects a time point when the second response signal avoids collision with the first response signal, and generates the second response signal at the collision-avoided time point.

2. The transmitter of claim 1, wherein the first response signal and the second response signal are generated by modulating the wireless power signal.

3. The transmitter of claim 1, wherein when the second wireless power receiver is placed in a specific area, the second wireless power receiver operates in a listening mode,

wherein when the second wireless power receiver operates in the listening mode, the second wireless power receiver receives the first response signal, detects a time point when the second response signal avoids collision with the first response signal, and generates the second response signal at the collision-avoided time point.

4. The transmitter of claim 3, wherein the specific area indicates an area through which the wireless power signal passes or an area in which the second wireless power receiver is detected.

5. A wireless power receiver comprising:

a power receiving unit configured to receive a wireless power signal from a wireless power transmitter;

a modulation/demodulation unit configured to generate a third response signal by modulating the wireless power signal; and

a power reception control unit configured to control the power receiving unit to receive a fourth response signal generated by another wireless power receiver receiving the wireless power signal, detect a time point when the third response signal avoids collision with the fourth response signal, and control the modulation/demodulation unit to generate the fourth response signal at the collision-avoided time point.

6. A signal collision avoiding method in a wireless power transfer, the method comprising:

forming a wireless power signal for power transmission;

periodically receiving a first response signal from the first wireless power receiver, the first response signal corresponding to the wireless power signal; and

receiving a second response signal from a second wireless power receiver, the second response signal avoiding collision with the first response signal, when the second wireless power receiver is placed in a specific area,

wherein the second wireless power receiver receives the first response signal, detects a time point when the second response signal avoids collision with the first response signal, and generates the second response signal at the collision-avoided time point.

7. The method of claim 6, wherein the specific area indicates an area through which the wireless power signal passes or an area in which the second wireless power receiver is detected.