WIRELESS POWER TRANSMITTER AND METHOD OF TRANSMITTING POWER THEREOF

• US 20130134794A1
• Filed: 11/26/2012
• Published: 05/30/2013
• Est. Priority Date: 11/25/2011
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: Korea Electrotechnology Research Institute, LG Innotek Company Limited (LG Corporation)
• Inventors: LEE, Ki Min, KIM, Jin Wook, PARK, Young Jin, KIM, Kwan Ho, SON, Hyeon Chang, LEE, Won Tae
• Granted Patent: US 9,287,736 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 50/80 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
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed are a wireless power transmitter and a method of transmitting power thereof. The wireless power transmitter to wirelessly transmit power to a wireless power receiver includes a transmission coil to receive power from a power supply apparatus, and a transmission resonance unit to transmit the power received therein from the transmission coil to the wireless power receiver using resonance. The transmission resonance unit includes an inner loop, and an outer loop connected to the inner loop while surrounding the inner loop.

Claims

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

a transmission coil to receive power from a power supply apparatus; and

a transmission resonance unit to transmit the power received therein from the transmission coil to the wireless power receiver using resonance,

wherein the transmission resonance unit comprises;

an inner loop and

an outer loop connected to the inner loop while surrounding the inner loop.

2. The wireless power transmitter of claim 1, wherein the inner loop and the outer loop are formed by winding one conductive line at least one time, and a number of winding turns of the inner loop is equal to or different from a number of winding turns of the outer loop.

3. The wireless power transmitter of claim 1, wherein the inner loop and the outer loop have one of a circular shape, a rectangular shape, and an oval shape.

4. The wireless power transmitter of claim 1, wherein the transmission resonance unit comprises a plurality of resonant coils, and the wireless power transmitter further comprises a switch unit selectively operating at least one of the resonant coils corresponding to a region in which the wireless power receiver is detected.

5. The wireless power transmitter of claim 4, further comprising a distribution coil to transmit the power, which is received therein through coupling with the transmission coil, to the resonant coil corresponding to the region, in which the wireless power receiver is detected, among the resonant coils.

6. The wireless power transmitter of claim 5, wherein the switch unit comprises a plurality of switches, and each switch is paired with each resonant coil to connect the resonant coil corresponding to the region, in which the wireless power receiver is detected, to the distribution coil.

7. The wireless power transmitter of claim 5, wherein the distribution coil comprises an inductor and a capacitor to constantly maintain a resonance frequency for power transmission with the wireless power receiver.

8. The wireless power transmitter of claim 6, wherein the resonant coil corresponding to the region, in which the wireless power receiver is detected, among the resonant coils is connected to the distribution coil in series.

9. The wireless power transmitter of claim 4, further comprising a detector to detect an approaching state of the wireless power receiver.

10. The wireless power transmitter of claim 9, wherein the detector comprises a coil for detection to detect intensity of a magnetic field formed in each resonant coil.

11. The wireless power transmitter of claim 5, wherein each switch is a micro-electro-mechanical system switch.

16. A recording medium having a program to execute a method of transmitting power of a wireless power transmitter claimed according to claim 11.

12. A method of transmitting power of a wireless power transmitter that wirelessly transmits power to a wireless power receiver, the method comprising:

detecting an approaching state of the wireless power receiver;

operating a resonant coil corresponding to a region, in which the wireless power receiver is detected, among a plurality of resonant coils according to a detection result; and

transmitting the power to the wireless power receiver using resonance by the resonant coil corresponding to the region in which the wireless power receiver is detected.

13. The method of claim 12, wherein the operating of the resonant coil corresponding to the region, in which the wireless power receiver is detected, among the resonant coils according to the detection result comprises switching the resonant coil corresponding to the region in which the wireless power receiver is detected.

14. The method of claim 12, further comprising:

determining a change state of a resonance frequency of the wireless power transmitter according to an operation of the resonant coil corresponding to the region in which the wireless power receiver is detected; and

matching the resonance frequency of the wireless power transmitter with a resonance frequency of the wireless power receiver if the resonance frequency of the wireless power transmitter is changed according to a determination result.

15. The method of claim 14, wherein the matching of the resonance frequency of the wireless power transmitter with the resonance frequency of the wireless power receiver if the resonance frequency of the wireless power transmitter is changed according to the determination result comprises:

checking the changed resonance frequency and

changing the checked resonance frequency to the resonance frequency of the wireless power receiver by using an inductor and a capacitor.

17. A recording medium having a program to execute a method of transmitting power of a wireless power transmitter claimed according to claim 12.

18. A recording medium having a program to execute a method of transmitting power of a wireless power transmitter claimed according to claim 13.

19. A recording medium having a program to execute a method of transmitting power of a wireless power transmitter claimed according to claim 14.

20. A recording medium having a program to execute a method of transmitting power of a wireless power transmitter claimed according to claim 15.