POWER TRANSMITTER, REPEATER, POWER RECEIVER, AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20140035390A1
• Filed: 04/06/2012
• Published: 02/06/2014
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Bae, Su Ho, Lee, Ki Min
• Granted Patent: US 9,590,454 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices

Abstract

Disclosed is a wireless power transmission system. The wireless power transmission system includes a power transmitter including a first resonant circuit and wirelessly transmitting power using a resonance, at least one repeater including a second resonant circuit resonating with the first resonant circuit, and a power receiver disposed between the power transmitter and the repeater, including a third resonant circuit magnetically resonating with the first and second resonant circuits, and receiving power from the power transmitter and the repeater. If the power transmitter and the repeater are installed in an indoor space, such as a room or an office room, and the power receiver is installed in a mobile device, such as a cellular phone, the mobile device is automatically charged in the indoor space.; The power transmission efficiency is improved by installing the power receiver between the power transmitter and the repeater. The received power is adjusted according to the alignment direction of the power receiver.

Claims

1. A wireless power transmission system, comprising:

a power transmitter including a first resonant circuit and wirelessly transmitting power;

at least one repeater including a second resonant circuit resonating with the first resonant circuit; and

a power receiver disposed between the power transmitter and the repeater, including a third resonant circuit resonating with at least one of the first and second resonant circuits to receive power from the power transmitter and the repeater.

2. The wireless power transmission system of claim 1, wherein each of the first, second and third resonant circuits includes an inductor and a capacitor.

3. The wireless power transmission system of claim 1, wherein each of the first, second and third resonant circuits includes at least one of solenoid type coils or spiral type coils.

4. The wireless power transmission system of claim 1, wherein the power transmitter and the repeater are fixable and the power receiver is movable.

5. A power transmitter for wirelessly transmitting power, the power transmitter comprising:

a power source generating the power having a predetermined frequency for a resonance;

and a first resonant circuit transmitting the power using the resonance,

wherein the power transmitter transmits the power to a power receiver disposed between the power transmitter and a repeater, the repeater including a second resonant circuit and the power receiver including a third resonant circuit.

6. The power transmitter of claim 5, further comprising a transmission coil that receives AC power from the power source and transmits the AC power to the first resonant circuit using an electromagnetic induction.

7. A repeater for wirelessly transmitting power, the repeater comprising:

a second resonant circuit transmitting the power from a power transmitter using a resonance to a power receiver,

the power receiver disposed between the power transmitter and the repeater, the power transmitter including a first resonant circuit and the power receiver including a third resonant circuit.

8. The repeater of claim 7, wherein each of the first, second and third resonant circuits includes at least one of solenoid type coils or spiral type coils.

9. The repeater of claim 7, wherein a plurality of repeaters are provided to transfer the power received from the power transmitter to the power receiver.

10. A power receiver comprising:

a third resonant circuit,

wherein the power receiver is disposed between a power transmitter and at least one repeater, the power transmitter including a first resonant circuit and wirelessly transmitting power using a resonance to the power receiver and the at least one repeater each including a second resonant circuit resonating with the first resonant circuit, and

the third resonant circuit magnetically resonates with at least one of the first and second resonant circuits, and the power receiver wirelessly receives power from the power transmitter and the at least one repeater.

11. The power receiver of claim 10, further comprising:

a controller that detects the power from at least one of the power transmitter and the repeater and generates a control signal to adjust the received power according to the detected power; and

a modulator for transmitting the control signal to the power transmitter or the repeater.

12. The power receiver of claim 11, wherein the controller transmits a power blocking signal to the modulator to shut off the power transmitted to the power receiver when the power received in the power receiver is equal to or less than a critical value.

13. The power receiver of claim 11, wherein the controller transmits a power blocking signal to the modulator to shut off the power transmitted to the power receiver when there is no power received in the power receiver.

14. The power receiver of claim 10, further comprising:

a receiving coil that receives the power from the third resonant circuit using an electromagnetic induction.

15. The power receiver of claim 11, wherein the controller transmits a power blocking signal to the modulator to shut off the power transmitted to the repeater when the power received in the power receiver is equal to or less than a critical value.

16. The power receiver of claim 11, wherein the controller transmits a power blocking signal to the modulator to shut off the power transmitted to the repeater when there is no power received in the power receiver.

17. The wireless power transmission system of claim 10, wherein the third resonant circuit is disposed on a space surrounded by the power transmitter and the at least one repeater.

18. The wireless power transmission system of claim 10, wherein the at least one repeater is disposed at a wirelessly power-reachable distance from the power transmitter.