WIRELESS POWER TRANSMITTER AND RECEIVER

• US 20160118810A1
• Filed: 10/19/2015
• Published: 04/28/2016
• Est. Priority Date: 10/22/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Yongcheol
• Granted Patent: US 10,103,553 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 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed is a method of wirelessly transmitting, the method including: a selection phase for detecting each of power receivers and sending a digital ping to the each of power receivers; an introduction phase for receiving a request from the each of power receivers for a free slot; a configuration phase for providing a series of locked slots to the each of power receivers; a negotiation phase for receiving at least one negotiation data packet from the each of power receivers using the series of locked slots; a power transfer phase for transmitting power to the each of power receivers; and a renegotiation phase for returning to the negotiation phase, wherein the renegotiation phase is a phase for returning to the negotiation phase when a change of a charge status of at least one of the each of power receivers to which the power is transmitted is detected.

Claims

1. A method of wireless power transfer, by a power transmitter transmitting power to a plurality of power receivers, the method comprising:

a selection phase for detecting each of power receivers and sending a digital ping to the each of power receivers;

an introduction phase for receiving a request from the each of power receivers for a free slot through which the each of power receivers sends a control information (CI) packet;

a configuration phase for providing a series of locked slots to the each of power receivers;

a negotiation phase for receiving at least one negotiation data packet from the each of power receivers using the series of locked slots;

a power transfer phase for transmitting power to the each of power receivers; and

a renegotiation phase for returning to the negotiation phase,

wherein the renegotiation phase is a phase for returning to the negotiation phase when a change of a charge status of at least one of the each of power receivers to which the power is transmitted is detected.

2. The method of claim 1, wherein a case where the change of the charge status of the at least one power receiver is detected includes:

a case where a charge completion of the at least one power receiver is detected, or

a case where a deviation of the at least one power receiver from a charging area is detected.

3. The method of claim 1, wherein the renegotiation phase includes detecting the change of the charge status by receiving an end power transfer (EPT) packet from each of the at least one power receiver.

4. The method of claim 3, wherein the EPT packet includes:

information on a slot number allocated to the each of the at least one power receiver, and

EPT code information indicating a charge completion of the each of the at least one power receiver.

5. The method of claim 1, wherein the renegotiation phase includes a phase for detecting the change of the charge status when a CI packet is not consecutively received from the at least one power receiver.

6. The method of claim 1, wherein, when the change of the charge status of the at least one power receiver is detected, the renegotiation phase includes a phase for notifying remaining power receivers of the each of power receivers other than the at least one power receiver of a return to the negotiation phase.

7. The method of claim 6, wherein the phase for notifying the remaining power receivers of the return to the negotiation phase includes sending a sync pattern including renegotiation information indicating the return to the negotiation phase to the remaining receivers.

8. The method of claim 7, wherein the renegotiation information is included in an Info field of the sync pattern.

9. The method of claim 7, further comprising a phase for receiving an EPT packet from the remaining power receivers as a response to the sync pattern.

10. The method of claim 9, wherein the EPT packet includes:

information on slot numbers allocated to the remaining power receivers, and

EPT code indicating the return to the negotiation phase.

11. A power transmitter transmitting power to a plurality of power receivers, comprising:

a coil assembly configured to include at least one primary coil for generating a magnetic field;

an inverter configured to convert a DC (Direct Current) signal into an AC (Alternating Current) signal;

a tank circuit configured to provide impedance matching between the inverter and the at least one primary coil;

a communication unit configured to perform communication with a power receiver; and

a control unit configured to control power transfer,

wherein the power transmitter is configured to;

detect each of power receivers and send a digital ping to the each of power receivers,

receive a request from the each of power receivers for a free slot through which the each of power receivers sends a control information (CI) packet,

provide a series of locked slots to the each of power receivers,

receive at least one negotiation data packet from the each of power receivers using the series of locked slots, and

transmit power to the each of power receivers, and

return to the negotiation phase when a change of a charge status of at least one of the each of power receivers to which the power is transmitted is detected.

12. The power transmitter of claim 11, wherein a case where the change of the charge status of the at least one power receiver is detected includes:

a case where a charge completion of the at least one power receiver is detected, or

a case where a deviation of the at least one power receiver from a charging area is detected.

13. The power transmitter of claim 11, wherein the power transmitter is further configured to detect the change of the charge status by receiving an end power transfer (EPT) packet from each of the at least one power receiver.

14. The power transmitter of claim 13, wherein the EPT packet includes:

information on a slot number allocated to the each of the at least one power receiver, and

EPT code information indicating a charge completion of the each of the at least one power receiver.

15. The power transmitter of claim 11, wherein the power transmitter is further configured to detect the change of the charge status when a CI packet is not consecutively received from the at least one power receiver.

16. The power transmitter of claim 11, wherein, when the change of the charge status of the at least one power receiver is detected, the power transmitter is further configured to notify remaining power receivers of the each of power receivers other than the at least one power receiver of a return to the negotiation phase.

17. The power transmitter of claim 16, wherein the power transmitter is further configured to send a sync pattern including renegotiation information indicating the return to the negotiation phase to the remaining receivers.

18. The power transmitter of claim 17, wherein the renegotiation information is included in an Info field of the sync pattern.

19. The power transmitter of claim 17, wherein the power transmitter is further configured to receive an EPT packet from the remaining power receivers as a response to the sync pattern.

20. The power transmitter of claim 19, wherein the EPT packet includes:

information on slot numbers allocated to the remaining power receivers, and

EPT code indicating the return to the negotiation phase.