METHOD FOR COMMUNICATION AND POWER CONTROL OF WIRELESS POWER TRANSMITTER IN MAGNETIC RESONANT WIRELESS POWER TRANSMISSION SYSTEM

• US 20140070625A1
• Filed: 09/06/2013
• Published: 03/13/2014
• Est. Priority Date: 09/07/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Nam Yun, KWON, Sang Wook, PARK, Yun Kwon
• Application Number:
  US14/020,507
• Publication Number:
  US 20140070625A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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

Abstract

A method for communication and power control of a wireless power transmitter, includes transmitting notice information to a wireless power receiver, and detecting a wireless power receiver based on the notice information, the wireless power receiver accessing the wireless power transmitter. The method further includes determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on a power control and/or a power transmission efficiency, and transmitting a reset command to the wireless power receiver in response to the wireless power receiver being determined to incorrectly access the wireless power transmitter.

Claims

1. A method for communication and power control of a wireless power transmitter, the method comprising:

transmitting notice information to a wireless power receiver;

detecting a wireless power receiver based on the notice information, the wireless power receiver accessing the wireless power transmitter;

determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on a power control and/or a power transmission efficiency; and

transmitting a reset command to the wireless power receiver in response to the wireless power receiver being determined to incorrectly access the wireless power transmitter.

2. The method of claim 1, wherein the detecting comprises:

transmitting, to the wireless power receiver, a wake-up power to be used to activate a communication function of the wireless power receiver;

receiving, from the wireless power receiver, a search signal corresponding to the notice information; and

transmitting, to the wireless power receiver, a response signal corresponding to the search signal.

3. The method of claim 1, wherein the detecting comprises:

supplying a detection power to a source resonator of the wireless power transmitter;

measuring a change in an impedance of the source resonator, or a change in a load of the source resonator;

supplying, to the source resonator, a power greater than the detection power in response to the change in the impedance, or the change in the load, being measured to be greater than a predetermined value; and

receiving, from the wireless power receiver, a search signal corresponding to the notice information; and

transmitting, to the wireless power receiver, a response signal corresponding to the search signal.

4. The method of claim 1, wherein:

the notice information comprises a network identifier (ID) of the wireless power transmitter; and

the detecting comprises comparing a network ID received from the wireless power receiver with the network ID included in the notice information.

5. The method of claim 1, wherein the determining comprises:

changing a power supplied to a source resonator of the wireless power transmitter based on a predetermined timing;

receiving, from the wireless power receiver, information on a change in a power received at the wireless power receiver; and

determining whether the change in the received power is matched to the change in the supplied power.

6. The method of claim 1, wherein the determining comprises:

generating an operation power to be used to operate the wireless power receiver;

transmitting the operation power to the wireless power receiver;

receiving, from the wireless power receiver, information on an amount of a power received at the wireless power receiver;

comparing an amount of the operation power with the amount of the received power; and

determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on the comparison.

7. The method of claim 1, wherein the determining comprises:

transmitting, to the wireless power receiver, information on an amount of a power transmitted by the wireless power transmitter;

receiving, from the wireless power receiver, information on the power transmission efficiency between the wireless power transmitter and the wireless power receiver;

comparing the received power transmission efficiency with a power transmission efficiency allowed between the wireless power transmitted and the wireless power receiver; and

determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on the comparison.

8. The method of claim 1, wherein the determining comprises:

generating an operation power to be used to operate the wireless power receiver;

transmitting the operation power to the wireless power receiver;

receiving, from the wireless power receiver, information on an amount of a power received at the wireless power receiver;

calculating the power transmission efficiency between the wireless power transmitter and the wireless power receiver based on the amount of the received power;

comparing the calculated power transmission efficiency with a power transmission efficiency allowed between the wireless power transmitter and the wireless power receiver; and

determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on the comparison.

9. The method of claim 1, wherein the determining comprises:

receiving, from the wireless power receiver, a received signal strength indication (RSSI) of a signal transmitted by the wireless power transmitter to the wireless power receiver;

comparing the RSSI with a predetermined value; and

determining whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on the comparison.

10. A method for communication and power control of a wireless power receiver, the method comprising:

receiving notice information from a wireless power transmitter;

transmitting a search signal to the wireless power transmitter based on the notice information;

accessing the wireless power transmitter based on the search signal; and

resetting the wireless power receiver in response to a reset command being received from the wireless power transmitter.

11. The method of claim 10, further comprising:

searching for a new wireless power transmitter in response to the wireless power receiving being reset.

12. The method of claim 10, wherein the accessing comprises:

receiving a wake-up power from the wireless power transmitter;

activating a communication function, using the wake-up power; and

receiving, from the wireless power transmitter, a response signal corresponding to the search signal.

13. The method of claim 10, wherein:

the notice information comprises a network identifier (ID) of the wireless power transmitter; and

the search signal comprises the network ID.

14. The method of claim 10, further comprising, prior to receiving the reset command:

measuring a received signal strength indication (RSSI) of a signal received from the wireless power transmitter; and

transmitting the RSSI to the wireless power transmitter.

15. The method of claim 10, further comprising, prior to receiving the reset command:

measuring a change in a power received from the wireless power transmitter; and

transmitting, to the wireless power transmitter, information on the change in the received power.

16. The method of claim 15, wherein:

the change in the received power comprises a change in a current and/or a change in a voltage; and

the change in the received power is measured between a target resonator and a rectification unit of the wireless power receiver, or at an output end of the rectification unit, or at an input end of a battery of the wireless power receiver, or any combination thereof.

17. The method of claim 10, further comprising, prior to receiving the reset command:

receiving an operation power from the wireless power transmitter; and

transmitting, to the wireless power transmitter, information on an amount of the received operation power.

18. The method of claim 17, wherein:

the amount of the received operation power comprises an amount of a current; and

the amount of the current is measured between a target resonator and a rectification unit of the wireless power receiver, or at an output end of the rectification unit, or at an input end of a battery of the wireless power receiver, or any combination thereof.

19. The method of claim 10, further comprising, prior to receiving the reset command:

receiving, from the wireless power transmitter, information on an amount of a power transmitted by the wireless power transmitter;

calculating a power transmission efficiency based on the amount of the transmitted power; and

transmitting, to the wireless power transmitter, information on the power transmission efficiency.

20. A wireless power transmitter comprising:

a communication unit configured to transmit notice information to a wireless power receiver; and

a controller configured to

detect the wireless power receiver based on the notice information, the wireless power receiver accessing the wireless power transmitter, and

determine whether the wireless power receiver is to cease the accessing of the wireless power transmitter based on a power control and/or a power transmission efficiency,

wherein the communication unit is further configured to transmit a reset command to the wireless power receiver in response to the wireless power receiver being determined to incorrectly access the wireless power transmitter.

21. A wireless power receiver comprising:

a communication unit configured to

receive notice information from a wireless power transmitter, and

transmit a search signal to the wireless power transmitter based on the notice information; and

a controller configured to

access the wireless power transmitter based on the search signal, and

reset the wireless power receiver in response to a reset command being received from the wireless power transmitter.