WIRELESS POWER TRANSMISSION DEVICE, WIRELESS POWER TRANSMISSION CONTROL DEVICE, AND WIRELESS POWER TRANSMISSION METHOD

• US 20110089769A1
• Filed: 10/15/2010
• Published: 04/21/2011
• Est. Priority Date: 10/16/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., Seoul National University R&DB Foundation (Seoul National University)
• Original Assignee: Samsung Electronics Co. Ltd., Seoul National University R&DB Foundation (Seoul National University)
• Inventors: Nam, Sang Wook, Hong, Young-tack, Park, Jong Min, Kwon, Sang Wook, Kim, Yoon Goo, Park, Eun Seok
• Granted Patent: US 9,350,201 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power transmission device, a wireless power transmission control device, and a wireless power transmission method are provided. A coupling frequency between a source resonator and a target resonator is determined A transmission frequency is controlled such that power is transmitted from the source resonator to the target resonator at the coupling frequency. Therefore, it is possible to maintain a high power transmission efficiency without using an additional matching circuit even when a distance between the source resonator and the target resonator is changed.

Claims

1. A wireless power transmission device, comprising:

a determiner to determine a coupling frequency between a source resonator and a target resonator; and

a controller to control a transmission frequency such that power is transmitted from the source resonator to the target resonator at the determined coupling frequency.

2. The wireless power transmission device of claim 1, wherein the coupling frequency is an odd mode frequency.

3. The wireless power transmission device of claim 1, wherein the determiner measures a reflected wave received from the target resonator that is in response to a transmission signal transmitted from the source resonator to the target resonator, and determines the coupling frequency to be a frequency where the reflected wave has a minimum amplitude.

4. The wireless power transmission device of claim 1, wherein the determiner measures a reflected wave received from the target resonator that is in response to a transmission signal transmitted from the source resonator to the target resonator, and determines the coupling frequency to be a frequency where a phase of the reflected wave is identical to a phase of the transmission signal.

5. The wireless power transmission device of claim 1, wherein the determiner measures a reflected wave received from the target resonator that is in response to a transmission signal transmitted from the source resonator to the target resonator, and determines the coupling frequency to be a frequency where the reflected wave has a minimum power.

6. The wireless power transmission device of claim 5, wherein the determiner comprises a power detector that detects the power of the reflected wave.

7. The wireless power transmission device of claim 3, wherein the determiner scans a band of frequencies lower than a center frequency of the transmission signal, and measures the reflected wave generated by the scanned band of frequencies.

8. The wireless power transmission device of claim 3, further comprising a distance measuring unit to measure a distance between the source resonator and the target resonator,

wherein, when the distance between the source resonator and the target resonator decreases, the determiner scans a band of frequencies lower than the transmission frequency and measures the reflected wave, and

when the distance between the source resonator and the target resonator increases, the determiner scans a band of frequencies higher than the transmission frequency and measures the reflected wave.

9. The wireless power transmission device of claim 3, wherein the determiner comprises a directional coupler to measure the reflected wave.

10. The wireless power transmission device of claim 1, wherein the controller comprises a phase locked loop (PLL) circuit to control the transmission frequency.

11. A wireless power transmission method, comprising:

determining a coupling frequency between a source resonator and a target resonator; and

controlling a transmission frequency such that power is transmitted from the source resonator to the target resonator at the determined coupling frequency.

12. A wireless power transmission device, comprising:

an input unit to receive an input of a coupling frequency between a source resonator and a target resonator; and

a controller to control a transmission frequency such that power is transmitted from the source resonator to the target resonator at the input coupling frequency.

13. A wireless power transmission method, comprising:

receiving an input of a coupling frequency between a source resonator and a target resonator; and

controlling a transmission frequency such that power is transmitted from the source resonator to the target resonator at the input coupling frequency.

14. A wireless power transmission control device, comprising:

a determiner to determine a coupling frequency between a source resonator and a target resonator; and

an output unit to transmit the coupling frequency to a wireless power transmission device.

15. The wireless power transmission control device of claim 14, wherein the coupling frequency is an odd mode frequency.

16. The wireless power transmission control device of claim 14, wherein, when an amount of a power transmitted by the wireless power transmission device is less than a predetermined value, the determiner determines the coupling frequency.

17. The wireless power transmission control device of claim 16, further comprising an input unit to receive an input of the predetermined value.