WIRELESS POWER TRANSMISSION AND RECEPTION APPARATUS HAVING RESONANCE FREQUENCY STABILIZATION CIRCUIT AND METHOD THEREOF

• US 20110198938A1
• Filed: 02/17/2011
• Published: 08/18/2011
• Est. Priority Date: 02/17/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PARK, Se-Ho, Lee, Woo-Ram, Kim, Ki-Hyun, Kim, Hong-Kweun, Lee, Young-Min, Park, Sung-Kweon
• Granted Patent: US 8,823,215 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 50/402 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

Abstract

A wireless power transmission apparatus and method for wirelessly transmitting power to a wireless power reception apparatus electromagnetically coupled to the wireless power reception apparatus and supplying power for loads of the wireless power reception apparatus is provided. The apparatus includes a power generator for generating power having a fixed oscillation frequency; a power transmission resonator, which has a resonance frequency identical to the oscillation frequency, for wirelessly transmitting the power generated by the power generator to the wireless power reception apparatus; and a power transmission resonance frequency controller for controlling the resonance frequency of the power transmission resonator in response to a change of the resonance frequency of the power transmission resonator.

Claims

1. A wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus electromagnetically coupled to the wireless power reception apparatus, the wireless power transmission apparatus comprising:

a power generator for generating power having a fixed oscillation frequency;

a power transmission resonator, which has a resonance frequency identical to the oscillation frequency, for wirelessly transmitting the power generated by the power generator to the wireless power reception apparatus; and

a power transmission resonance frequency controller for controlling the resonance frequency of the power transmission resonator in response to a change of the resonance frequency of the power transmission resonator.

2. The wireless power transmission apparatus of claim 1, wherein the power transmission resonance frequency controller comprises:

an LC tuner for sequentially changing an LC value of the power transmission resonator to at least two predetermined LC values;

a monitoring resonator, which is disposed close to the power transmission resonator, for monitoring the power wirelessly transmitted from the power transmission resonator;

a matching circuit for processing impedance matching of the monitoring resonator; and

an LC tuner controller, which is connected to the matching circuit, checks a power value input through the monitoring resonator, and controls the LC tuner according to an LC value corresponding to a maximum power value.

3. The wireless power transmission apparatus of claim 2, wherein the LC tuner is a variable Micro Electra-Mechanical Systems (MEMS) LC.

4. The wireless power transmission apparatus of claim 2, wherein the LC tuner is a selective LC switch bank.

5. A wireless power reception apparatus for wirelessly receiving power from a wireless power transmission apparatus electromagnetically coupled to the wireless power transmission apparatus, the wireless power reception apparatus comprising:

a power reception resonator for setting a resonance frequency of the wireless power reception apparatus to be identical to a resonance frequency of the wireless power transmission apparatus and receiving power from a power transmission resonator of the wireless power transmission apparatus through coupling with the power transmission resonator; and

a power reception resonance frequency controller for sensing a change of power supplied from the power reception resonator to loads and controlling the resonance frequency of the power reception resonator.

6. The wireless power reception apparatus of claim 5, wherein the power reception resonance frequency controller comprises:

an LC tuner for sequentially setting an LC value of the power reception resonator to at least two predetermined LC values; and

an LC tuner controller for checking a power value supplied to a load of the wireless power reception apparatus and controlling the LC tuner according to an LC value corresponding to a maximum power value.

7. The wireless power reception apparatus of claim 6, wherein the LC tuner is a variable Micro Electro-Mechanical Systems (MEMS) LC.

8. The wireless power reception apparatus of claim 6, wherein the LC tuner is a selective LC switch bank.

9. A method performed in a wireless power transmission apparatus for wirelessly transmitting power to a wireless power reception apparatus electromagnetically coupled to the wireless power reception apparatus, the method comprising:

generating power having a fixed oscillation frequency;

wirelessly transmitting the power generated by the power generator to the wireless power reception apparatus through a resonance frequency identical to the oscillation frequency; and

controlling the resonance frequency of the power transmission resonator in response to a change of the resonance frequency of the power transmission resonator.

10. The method of claim 9, wherein controlling the resonance frequency comprises:

sequentially changing, by an LC tuner, an LC value of the power transmission resonator to at least two predetermined LC values;

monitoring the power wirelessly transmitted from the power transmission resonator;

processing impedance matching of the monitoring resonator; and

checking, by an LC tuner controller connected to the matching circuit, a power value input through the monitoring resonator, and controlling the LC tuner according to an LC value corresponding to a maximum power value.

11. The method of claim 10, wherein the LC tuner is a variable Micro Electro-Mechanical Systems (MEMS) LC.

12. The method of claim 10, wherein the LC tuner is a selective LC switch bank.

13. A method performed in a wireless power reception apparatus for wirelessly receiving power from a wireless power transmission apparatus electromagnetically coupled to the wireless power transmission apparatus, the method comprising:

setting a resonance frequency of the wireless power reception apparatus to be identical to a resonance frequency of the wireless power transmission apparatus and receiving power from a power transmission resonator of the wireless power transmission apparatus through coupling with the power transmission resonator; and

sensing a change of power supplied from the power reception resonator to loads; and

controlling the resonance frequency of the power reception resonator.

14. The method of claim 13, further comprising:

sequentially setting, by an LC tuner, an LC value of the power reception resonator to at least two predetermined LC values;

checking a power value supplied to a load of the wireless power reception apparatus; and

controlling the LC tuner according to an LC value corresponding to a maximum power value.

15. The method of claim 14, wherein the LC tuner is a variable Micro Electro-Mechanical Systems (MEMS) LC.

16. The method of claim 14, wherein the LC tuner is a selective LC switch bank.