WIRELESS POWER TRANSMITTER AND WIRELESS POWER TRANSMISSION METHOD

• US 20140265622A1
• Filed: 07/10/2012
• Published: 09/18/2014
• Est. Priority Date: 08/26/2011
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Jung, Woo Kil
• Granted Patent: US 9,184,634 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• 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: H04B 5/79 for data transfer in combination with power transfer

Abstract

Disclosed are a wireless power transmitter and a wireless power transmission method thereof The wireless power transmitter, which wirelessly transmits power to a wireless power receiver, includes a power source to generate AC power, a transmission coil receiving power from the power source to generate a magnetic field, a transmission resonance coil coupled with the transmission coil to transmit power generated by the magnetic field to the wireless power receiver using resonance, and a detector detecting an existence state of the wireless power receiver by detecting power transmitted through the transmission resonance coil.

Claims

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

a transmission coil for wireless transmitting a power;

a power source for supplying the power to the transmission coil; and

a detector for detecting an intensity of current output from the power source,

wherein the power source supplies the power at a predetermined period through a time-division scheme to determine an existence state of the wireless power receiver.

2. The wireless power transmitter of claim 1, wherein the power source does continuously supply the power if the wireless power receiver exists.

3. The wireless power transmitter of claim 2, wherein the detector detects the intensity of current output from the power source while the power source does continuously supply the power.

4. The wireless power transmitter of claim 3, further comprising a controller for adjusting the power according to the intensity of current output from the power source while the power source does continuous supply the power.

5. The wireless power transmitter of claim 4, wherein the controller re-determines the existence state of the wireless power receiver according to the intensity of current output from the power source while the power source does continuously supply the power, stops supplying of the power—

if the wireless power receiver does not exist, and maintains supplying of the power if the wireless power receiver exists.

6. The wireless power transmitter of claim 1, further comprising a transmission resonance coil coupled with the transmission coil and for transmitting the power together with the transmission coil.

7. The wireless power transmitter of claim 6, wherein the detector comprises a current sensor.

8. The wireless power transmitter of claim 1, wherein

the detector comprises a current sensor.

18. The wireless power transmitter of claim 4, wherein the controller reduces the power if the intensity of current output from the power source is increased, and increases the power if the intensity of current output from the power source is decreased.

19. The wireless power transmitter of claim 5, wherein the controller makes a determination that wireless power receiver does not exist if the intensity of current output from the power source is increased.

20. The wireless power transmitter of claim 8, wherein the current sensor is placed between the power source and the transmission coil.

9. A wireless power transmission method by a wireless power transmitter to wirelessly transmit a power to a wireless power receiver, the wireless power transmission method comprising:

supplying, at a power source, a power to a transmission coil;

for

wirelessly transmitting the power; and

detecting, at a detector, an intensity of current output from the power source,

wherein the supplying of the power comprises supplying the power at a predetermined period through a time-division scheme to

determine an existence state of the wireless power receiver.

10. The wireless power transmission method of claim 9, wherein the supplying of the power further comprises continuously supplying the power if the wireless power receiver exists.

11. The wireless power transmission method of claim 10, wherein the detecting—

of the intensity of current comprises the intensity of current output from the power source while the power source does continuously supply the power.

12. The wireless power transmission method of claim 11, further comprising adjusting, at a controller, according to the intensity of current output from the power source while the power source does continuously supply the power.

13. The wireless power transmission method of claim 12, wherein the adjusting of the power comprises:

re-determining the existence state of the wireless power receiver according to the intensity of current output from the power source while the power source does continuously supply the power;

stopping supply of the power if the wireless power receiver does not exist; and

maintaining supplying of the power if the wireless power receiver exists.

14. The wireless power transmission method of claim 9, wherein the detector comprises a current sensor.

15. The wireless power transmission method of claim 12, wherein the adjusting of the power comprises:

reducing the power if the intensity of current output from the power source is increased; and

increasing the power if the intensity of current output from the power source is decreased.

16. The wireless power transmission method of claim 13, wherein the re-determining of the existence state of the wireless power receiver makes a determination that wireless power receiver does not exist if the intensity of current output from the power source is increased.

17. The wireless power transmission method of claim 9, wherein the supplying of the power is returned if the wireless power receiver does not exist.