Method and power transmitter for controlling power transmission

• US 10,340,726 B2
• Filed: 11/28/2017
• Issued: 07/02/2019
• Est. Priority Date: 07/10/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Byun, Kang-Ho, Park, Se-Ho, Jun, Hae-Young, Jung, Hee-Won
• Primary Examiner(s): Deberadinis, Robert L
• Application Number:
  US15/824,383
• Publication Number:
  US 20180159356A1
• Time in Patent Office: 581 Days
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• 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: H05K 999/99 dummy group
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatuses are provided for controlling power transmission in a power transmitter. A first message including a first voltage and a second voltage that is greater than the first voltage, is received from at least one power receiver. Power is transmitted to the at least one power receiver. A second message including a third voltage measured at the at least one power receiver during power transmission from the power transmitter, is received from the at least one power receiver. An amount of the power is adjusted based on whether the third voltage is between the first voltage and the second voltage. The first voltage is a minimum voltage for the at least one power receiver.

Claims

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

receiving, from at least one power receiver, a first message including a first voltage and a second voltage that is greater than the first voltage;

transmitting power to the at least one power receiver;

receiving, from the at least one power receiver, a second message including a third voltage measured at the at least one power receiver while transmitting the power; and

adjusting an amount of the power based on whether the third voltage is between the first voltage and the second voltage,

wherein the first voltage is a minimum voltage for the at least one power receiver.

2. The method of claim 1, wherein adjusting the amount of the power comprises:

decreasing the amount of the power, if the third voltage is greater than the second voltage, and increasing the amount of the power, if the third voltage is lower than the first voltage.

3. The method of claim 1, further comprising stopping transmitting the power, if the third voltage is greater than a predetermined value.

4. The method of claim 1, wherein the second voltage is a reference voltage for determining a voltage region having a charging efficiency greater than a threshold value.

5. The method of claim 1, wherein, when the at least one power receiver comprises a plurality of power receivers, further comprising adjusting the amount of the power to increase an entire efficiency for the plurality of power receivers, if the third voltage at each of the plurality of power receivers is between the first voltage and the second voltage.

6. The method of claim 1, wherein the second message includes at least one of a voltage at a charger of the at least one power receiver, a voltage measured at a rectifier output of the at least one power receiver, and a current measured at the at least one power receiver during power reception, a changed reference voltage, and a measured temperature.

7. A power transmitter for controlling power transmission, the power transmitter comprising:

a resonator;

a power supply;

a wireless communication unit configured to receive, from at least one power receiver, a first message including a first voltage and a second voltage that is greater than the first voltage, and receive, from the at least one power receiver, a second message including a third voltage measured at the at least one power receiver while transmitting the power; and

a controller configured to control the power supply to;

transmit the power to the at least one power receiver through the resonator; and

adjust an amount of the power based on whether the third voltage is between the first voltage and the second voltage, wherein the first voltage is a minimum voltage for the at least one power receiver.

8. The power transmitter of claim 7, wherein the second voltage is a reference voltage for determining a voltage region having a charging efficiency greater than a threshold value.

9. The power transmitter of claim 7, wherein the controller is further configured to adjust the amount of the power to increase an entire efficiency for a plurality of power receivers if the third voltage at each of the plurality of power receivers is between the first voltage and the second voltage.

10. The power transmitter of claim 7, wherein the controller is further configured to decrease the amount of the power, if the third voltage is greater than the second voltage, and to increase the amount of the power, if the third voltage is lower than the first voltage.

11. The power transmitter of claim 7, wherein the controller is further configured to stop transmitting the power, if the third voltage is greater than a predetermined value.

12. The power transmitter of claim 7, wherein the second message includes at least one of a voltage at a charger of the at least one power receiver, a voltage measured at a rectifier output of the at least one power receiver, and a current measured at the at least one power receiver during power reception, a changed reference voltage, a changed demanded voltage, and a measured temperature.