WIRELESS POWER TRANSMITTER AND POWER TRANSMISSION METHOD THEREOF

• US 20160233724A1
• Filed: 04/20/2016
• Published: 08/11/2016
• Est. Priority Date: 11/02/2011
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: BAE, Su Ho, LEE, Ki Min
• Granted Patent: US 10,181,756 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/502 the energy repeater being integrated together with the emitter or the receiver
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed are a wireless power transmitter and a power transmission method thereof. The wireless power transmitter includes a plurality of transmission resonance units, a detection power applying unit applying detection power to the transmission resonance units to detect a location of the wireless power receiver, and a current measuring unit measuring current generating from an inner part of the wireless power transmitter based on the applied detection power. The wireless power transmitter transmits the power through at least one transmitting resonance unit corresponding to the location of the wireless power receiver based on the measured current.

Claims

1. A wireless power transmitter for wirelessly transmitting power to a wireless power receiver, the wireless power transmitter comprising:

a plurality of coils;

a power supply unit generating an AC power;

a detection power applying unit applying a first frequency to the plurality of coils;

a measuring unit measuring a value based on an impedance variance of the plurality of coils; and

a controller comparing the value to a threshold value and determining a location of the wireless power receiver when the value exceeds the threshold value;

wherein the impedance variance is caused by the wireless power receiver, and

wherein the power supply unit is different from the detection power applying unit.

2. The wireless power transmitter of claim 1, wherein a second frequency is applied to the plurality of coils after the first frequency is applied.

3. The wireless power transmitter of claim 2, wherein the second frequency is different from the first frequency.

4. The wireless power transmitter of claim 2, wherein the second frequency is related to the wireless power receiver.

5. The wireless power transmitter of claim 1, wherein the threshold value is a previously determined value.

6. The wireless power transmitter of claim 1, wherein the controller determines a coil, of the plurality of coils, corresponding to the location of the wireless power receiver.

7. The wireless power transmitter of claim 1, wherein the measuring unit repeatedly measures the value based on the impedance variance of the plurality of coils.

8. The wireless power transmitter of claim 1, further comprising a pad provided near the plurality of coils.

9. The wireless power transmitter of claim 8, wherein the plurality of coils are spatially arranged across the pad.

10. The wireless power transmitter of claim 9, wherein the plurality of coils are arranged in a form of a lattice or a matrix.

14. The method of claim 1, wherein the threshold value is a previously determined value.

11. A method of a wireless power transmitter for wirelessly transmitting power to a wireless power receiver to detect the wireless power receiver,

applying a first frequency to a plurality of coils;

measuring a value based on an impedance variance of the plurality of coils;

comparing the value to a threshold value; and

determining a location of the wireless power receiver when the value exceeds the threshold value;

wherein the impedance variance is caused by the wireless power receiver, and

wherein a second frequency is applied to the plurality of coils after the first frequency is applied.

12. The method of claim 11, wherein the first frequency is different from the second frequency.

13. The method of claim 12, wherein the second frequency is related to the wireless power receiver.

15. The method of claim 11, determining a coil, of the plurality of coils, corresponding to the location of the wireless power receiver.

16. The method of claim 11, repeatedly measuring the value based on the impedance variance of the plurality of coils.