Power transmitting method and power transmitter for communication with power receiver

• US 9,735,623 B2
• Filed: 05/16/2012
• Issued: 08/15/2017
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Kyung-Woo, Byun, Kang-Ho, Lee, Young-Min, Park, Se-Ho, Kim, Yu-Su, Yeo, Sung-Ku
• Primary Examiner(s): Bee, Andrew
• Application Number:
  US13/473,062
• Publication Number:
  US 20120293007A1
• Time in Patent Office: 1,917 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, by a resonance signal generator, first power for detecting a change of load;

transmitting, by the resonance signal generator, second power having a first magnitude for communicating with a wireless power receiver, if the change of load is detected;

increasing a magnitude the second power to a second magnitude which is greater than the first magnitude;

receiving, by a wireless communication unit, a network subscription request message from the wireless power receiver, while transmitting the second power;

transmitting, by the wireless communication unit, an approval message to the wireless power receiver; and

transmitting, by the resonance signal generator, third power to the wireless power receiver, wherein the third power is used for charging in 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 if the network subscription request message is not received within a predetermined time through the wireless communication unit.

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

determining whether the wireless power receiver is capable of subscribing to a wireless multi-power transmission network using information in the network subscription request message; and

allowing the wireless power receiver to subscribe to the wireless multi-power transmission network if the wireless power receiver is determined to be capable of subscribing to the wireless multi-power transmission network.

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

denying subscription to the wireless power receiver to the wireless multi-power transmission network if the wireless power receiver is not determined to be capable of subscribing to the wireless multi-power transmission network.

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

stopping transmission of the second power to the wireless power receiver after the wireless power receiver is denied subscription to the wireless multi-power transmission network.

6. The method as claimed in claim 1, wherein the network subscription request message comprises a protocol version of the wireless power receiver.

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

comparing a measurement value corresponding to the changes of the load with a predetermined threshold value; and

detecting the changes of the load if the measurement value is greater than or equal to the predetermined threshold value.

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

a resonance signal generator configured to transmit first power for detecting a change of load; and

a wireless communication unit configured to perform wireless communication,

wherein the resonance signal generator is further configured to transmit second power having a first magnitude for communicating with a wireless power receiver, if the change of load is detected, and increase a magnitude of the second power to a second magnitude which is greater than the first magnitude; and

wherein the wireless communication unit is further configured to receive a network subscription request message from the wireless power receiver, while the resonance signal generator transmits the second power and transmit an approval message to the wireless power receiver;

wherein the resonance signal generator is further configured to transmit third power to the wireless power receiver, wherein the third power is used for charging in the wireless power receiver.

9. The wireless power transmitter claimed in claim 8, wherein the resonance signal generator is further configured to stop transmission of the second power to the wireless power receiver if the network subscription request message is not received within a predetermined time through the wireless communication unit.

10. The wireless power transmitter claimed in claim 8, wherein the controller determines whether the wireless power receiver is capable of subscribing to a wireless multi-power transmission network using information in the network subscription request message and allows the wireless power receiver to subscribe to the wireless multi-power transmission network if the wireless power receiver is determined to be capable of subscribing to the wireless multi-power transmission network.

11. The wireless power transmitter claimed in claim 10, wherein the controller denies subscription to the wireless power receiver to the wireless multi-power transmission network if the wireless power receiver is not determined to be capable of subscribing to the wireless multi-power transmission network.

12. The wireless power transmitter claimed in claim 11, wherein the resonance signal generator is further configured to stop transmission of the second power to the wireless power receiver after the wireless power receiver is denied subscription to the wireless multi-power transmission network.

13. The wireless power transmitter claimed in claim 8, wherein the network subscription request message comprises a protocol version of the wireless power receiver.

14. The wireless power transmitter claimed in claim 8, wherein the controller compares a measurement value corresponding to the changes of the load with a predetermined threshold value and detects the changes of the load if the measurement value is greater than or equal to the predetermined threshold value.