Power transmitting method and power transmitter for communication with power receiver

• US 10,637,299 B2
• Filed: 06/07/2019
• Issued: 04/28/2020
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Byun, Kang-Ho, Lee, Kyung-Woo, Lee, Young-Min, Park, Se-Ho, Kim, Yu-Su, Yeo, Sung-Ku
• Primary Examiner(s): Bee, Andrew W
• Application Number:
  US16/434,974
• Publication Number:
  US 20190288562A1
• Time in Patent Office: 326 Days
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A method and power transmitter for efficiently controlling power transmission to one or more power receivers in a wireless multi-power transmission system are provided. The method includes performing, when a predetermined measurement cycle arrives, a load measurement; comparing a current load measurement value with a previous load measurement value; determining whether the current load measurement value is increased over the previous load measurement value by at least as much as a first predetermined threshold; gradually increasing, when the load measurement value is increased over the previous load measurement value by at least as much as the first threshold, a transmission power value until a request for a subscription to a wireless multi-power transmission network from a power reception target within a predetermined time limit; and stopping, when the request for the subscription is not received before the time limit is exceeded, power transmission to the power reception target.

Claims

1. A method of controlling power transmission of a wireless power transmitter, the method comprising:

transmitting, through a resonator of the wireless power transmitter, first power for detecting a change of a load;

in response to the change of the load being detected, transmitting, through the resonator, second power for communicating with a wireless power receiver;

increasing a magnitude of the second power from a first magnitude to a second magnitude;

receiving a signal from the wireless power receiver while transmitting the second power, wherein the signal includes information regarding a reference load value;

based on the information regarding the reference load value, transmitting a response signal to the wireless power receiver; and

transmitting, through the resonator, third power to the wireless power receiver for charging the wireless power receiver.

2. The method as claimed in claim 1, further comprising:

stopping transmission of the second power to the wireless power receiver in response to the signal not being received within a predetermined time.

3. The method as claimed in claim 1, further comprising:

identifying whether the wireless power receiver is capable of joining a wireless transmission network based on the information included in the signal; and

allowing the wireless power receiver to join the wireless transmission network in response to the wireless power receiver being identified to be capable of joining the wireless transmission network.

4. The method as claimed in claim 3, further comprising:

denying registration of the wireless power receiver to the wireless transmission network in response to the wireless power receiver being identified not to be capable of joining the wireless transmission network.

5. The method as claimed in claim 4, further comprising:

stopping transmission of the second power to the wireless power receiver in response to the wireless power receiver being denied.

6. The method as claimed in claim 1, wherein the signal includes an ID information of the wireless power receiver.

7. The method as claimed in claim 1, further comprising:

comparing a measurement value corresponding to the change of the load with the reference load value; and

detecting the change of the load in response to a difference between the measurement value and the reference load value being within an acceptable range.

8. A wireless power transmitter for controlling power transmission comprising:

a resonator;

a communication unit; and

a controller configured to;

control to transmit, through the resonator, first power for detecting a change of a load;

control to, in response to the change of the load being detected, transmit, through the resonator, second power for communicating with a wireless power receiver;

control to increase a magnitude of the second power from a first magnitude to a second magnitude;

control to receive a signal from the wireless power receiver via the communication unit, wherein the signal includes information regarding a reference load value;

based on the information regarding the reference load value, control to transmit a response signal to the wireless power receiver via the communication unit; and

control to transmit, through the resonator, third power to the wireless power receiver for charging the wireless power receiver.

9. The wireless power transmitter claimed in claim 8, wherein the controller controls to stop transmission of the second power to the wireless power receiver in response to the signal not being received within a predetermined time.

10. The wireless power transmitter claimed in claim 8, wherein the controller identifies whether the wireless power receiver is capable of joining a wireless transmission network based on the information included in the signal and allows the wireless power receiver to join the wireless transmission network in response to the wireless power receiver being identified to be capable of joining the wireless transmission network.

11. The wireless power transmitter claimed in claim 10, wherein the controller denies registration of the wireless power receiver to the wireless transmission network in response to the wireless power receiver being identified not to be capable of joining the wireless transmission network.

12. The wireless power transmitter claimed in claim 11, wherein the controller controls to stop transmission of the second power in response to the wireless power receiver being denied.

13. The wireless power transmitter claimed in claim 8, wherein the signal includes an ID information of the wireless power receiver.

14. The wireless power transmitter claimed in claim 8, wherein the controller compares a measurement value corresponding to the change of the load with the reference load value and detects the change of the load in response to a difference between the measurement value and the reference load value being within an acceptable range.