Wireless power transmission apparatus and wireless power transmission method

• US 10,298,062 B2
• Filed: 09/26/2013
• Issued: 05/21/2019
• Est. Priority Date: 01/22/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Keum Su, Kwon, Sang Wook, Kim, Ki Young, Park, Yun Kwon, Park, Jae Hyun, Ahn, Chi Hyung, Ryu, Young Ho
• Primary Examiner(s): Cavallari, Daniel J
• Application Number:
  US14/037,726
• Publication Number:
  US 20140203657A1
• Time in Patent Office: 2,063 Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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

Abstract

A wireless power transmission apparatus includes resonators configured to transmit a power wirelessly to another resonator, and a controller configured to control a current magnitude and/or a voltage magnitude of a power to be provided to each of the resonators. The apparatus further includes a feeder configured to provide the power to each of the resonators.

Claims

1. A wireless power transmission apparatus comprising:

resonators configured to wirelessly transmit first power to a wireless power reception apparatus;

a controller configured to control a current magnitude and/or a voltage magnitude of second power to be provided to each of the resonators; and

a conductor configured to provide the second power to each of the resonators,

wherein the controller is further configured to;

receive, by using a communication unit, information of a voltage and/or a current that are applied to a load of the wireless power reception apparatus;

obtain an efficiency of the wireless power transmission, based on the received information and the current magnitude and/or the voltage magnitude of the second power; and

adjust the current magnitude and/or the voltage magnitude of the second power based on the efficiency of the transmission.

2. The apparatus of claim 1, wherein the controller is further configured to:

calculate an impedance of an N-port network between the other resonator connected the N-port network and the resonators connected to the N-port network; and

control the current magnitude and/or the voltage magnitude based on the impedance.

3. The apparatus of claim 1, wherein the resonators are coupled to each other, or separated from each other, and wherein the conductor comprises an inductor.

4. The apparatus of claim 1, further comprising:

a communication circuit configured to receive, from the wireless power reception apparatus, the information of the voltage and/or the current that are applied to the load of the wireless power reception apparatus in response to a test voltage and a test current being applied to the resonators.

5. The apparatus of claim 4, wherein the controller comprises:

one or more hardware processors configured to;

calculate an impedance of an N-port network between the other resonator connected the N-port network and the resonators connected to the N-port network, and the efficiency of the transmission, based on the received information of the voltage and/or the current;

optimize the impedance based on a predetermined power transmission efficiency; and

determine the current magnitude and/or the voltage magnitude based on a result of the optimization.

6. The apparatus of claim 5, wherein the one or more hardware processors is further configured to:

change the current magnitude and/or the voltage magnitude sequentially in a range of the current magnitude and/or the voltage magnitude that is applicable by the conductor.

7. The apparatus of claim 5, wherein the one or more hardware processors is further configured to:

change the current magnitude and/or the voltage magnitude randomly in a range of the current magnitude and/or the voltage magnitude that is applicable by the conductor.

8. The apparatus of claim 5, wherein the one or more hardware processors is further configured to:

change the current magnitude and/or the voltage magnitude based on a lookup table in a range of the current magnitude and/or the voltage magnitude that is applicable by the conductor.

9. The apparatus of claim 5, wherein the one or more hardware processors is further configured to:

estimate an optimal current magnitude and/or an optimal voltage magnitude of the second power of when the efficiency satisfies the predetermined power transmission efficiency, based on the impedance and an N-port matrix relational expression induced in the N-port network.

10. The apparatus of claim 1, wherein each of the resonators comprises:

a first transmission line comprising a first signal conducting portion, a second signal conducting portion, and a first ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor connected to the first signal conducting portion and the first ground conducting portion;

a second conductor connected to the second signal conducting portion; and

a capacitor inserted in series between the first signal conducting portion and the second signal conducting portion with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

11. A wireless power transmission apparatus comprising:

resonators configured to wirelessly transmit first power to a wireless power reception apparatus;

a controller configured to control a current magnitude and/or a voltage magnitude of a second power to be provided to each of the resonators; and

a conductor configured to provide the second power to each of the resonators, wherein each of the resonators comprises;

a first resonator comprising a surface parallel to an xy plane;

a second resonator comprising a surface parallel to a yz plane; and

a third resonator comprising a surface parallel to a zx plane.

12. A wireless power transmission apparatus comprising:

resonators configured to wirelessly transmit first power to a wireless power reception apparatus;

a controller configured to control a current phase and/or a voltage phase of the power to be provided to each of the resonators; and

a conductor configured to provide the second power to each of the resonators,

wherein the controller is further configured to;

receive, by using a communication unit, information of a voltage and/or a current that are applied to a load of the wireless power reception apparatus;

obtain an efficiency of the wireless power transmission, based on the received information and the current phase and/or the voltage phase of the second power; and

adjust the current phase and/or the voltage phase of the second power based on the efficiency of the transmission.

13. The apparatus of claim 12, wherein the controller is further configured to:

calculate an impedance of an N-port network between the other resonator connected to the N-port network and the resonators connected to the N-port network; and

control the current phase and/or the voltage phase based on the impedance.

14. The apparatus of claim 12, further comprising:

a communication circuit configured to receive, from the wireless power reception apparatus, the information of the voltage and/or the current that are applied to the load of the wireless power reception apparatus in response to a test voltage and a test current being applied to the resonators.

15. The apparatus of claim 14, wherein the controller comprises:

one or more hardware processors configured to;

calculate an impedance of an N-port network between the other resonator connected the N-port network and the resonators connected to the N-port network, and the efficiency of the transmission, based on the received information of the voltage and/or the current;

optimize the impedance based on a predetermined power transmission efficiency; and

determine the current phase and/or the voltage phase based on a result of the optimization.

16. A wireless power transmission method comprising:

controlling, by a controller, a current magnitude and/or a voltage magnitude of second power to be provided to each of resonators;

providing, by a conductor, the second power to each of the resonators; and

wirelessly transmitting, by the resonators, first power to a wireless power reception apparatus,

wherein the controlling comprises;

receiving, by using a communication unit, information of a voltage and/or a current that are applied to a load of the wireless power reception apparatus;

obtaining an efficiency of the transmission, based on the received information and the current magnitude and/or the voltage magnitude of the second power; and

adjusting the current magnitude and/or the voltage magnitude of the second power based on the efficiency of the transmission.

17. The method of claim 16, wherein the controlling comprises:

calculating an impedance of an N-port network between the other resonator connected the N-port network and the resonators connected to the N-port network; and

controlling the current magnitude and/or the voltage magnitude based on the impedance.

18. The method of claim 16, further comprising:

receiving, from the wireless power reception apparatus, the information of the voltage and/or the current that are applied to the load of the wireless power reception apparatus in response to a test voltage and a test current being applied to the resonators.

19. The method of claim 18, wherein the controlling comprises:

calculating an impedance of an N-port network between the other resonator connected the N-port network and the resonators connected to the N-port network, and the efficiency of the transmitting, based on the received information of the voltage and/or the current;

optimizing the impedance based on a predetermined power transmission efficiency; and

determining the current magnitude and/or the voltage magnitude based on a result of the optimizing.