Wireless power repeater and wireless power transmitter

Patent metadata

Field	Value
Publication number	US-9762293-B2
Application number	US-201214347156-A
Country	US
Kind code	B2
Filing date	Sep 11, 2012
Priority date	Sep 27, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

Disclosed is a wireless power transmitter which transmits power to a wireless power receiver using resonance. The wireless power transmitter includes a repeating resonant unit and a power source transmitting AC power having a mutual-change resonant frequency, which results from a mutual inductance component between the wireless power receiver and the repeating resonant unit, to the repeating resonant unit.

First claim

The invention claimed is:

1. A wireless power transmitter which wirelessly transmits power to a wireless power receiver using resonance, the wireless power transmitter comprising:
a repeating resonant unit; and
a power source transmitting, to the repeating resonant unit, AC power having a mutual-change resonant frequency,
wherein the mutual-change resonant frequency is varied according to a mutual inductance component between the wireless power receiver and the repeating resonant unit, and
wherein the repeating resonators are arranged in a form of a lattice or a matrix in a repeating pad.

2. The wireless power transmitter of claim 1 , wherein the repeating resonant unit includes a plurality of repeating resonators and the power source transmits the AC power having the mutual-change resonant frequency, which results from the mutual inductance component between the wireless power receiver and a specific repeating resonator corresponding to a position of the wireless power receiver.

3. The wireless power transmitter of claim 2 , wherein a resonant frequency of each repeating resonator is different from a resonant frequency of the wireless power receiver.

4. The wireless power transmitter of claim 2 , wherein the mutual-change resonant frequency is determined based on inductance and capacitance of the specific repeating resonator corresponding to a position of the wireless power receiver, and inductance and capacitance of the wireless power receiver.

5. The wireless power transmitter of claim 2 , wherein the mutual-change resonant frequency f 3 is expressed as a following equation:

f
3

=

1

2
⁢
π

⁢

(

L
1

⁢

C
1

-

L
2

⁢

C
2

)

2

+

4
⁢

C
1

⁢

C
2

⁢

M
2

-

L
1

⁢

C
1

-

L
2

⁢

C
2

2
⁢

(

C
1

⁢

C
2

⁢

M
2

-

L
1

⁢

L
2

⁢

C
1

⁢

C
2

)

,

wherein L 1 is an inductance value of the repeating resonator corresponding to the position of the wireless power receiver, L 2 is an inductance value of the wireless power receiver, C 1 is a capacitance value of the repeating resonator corresponding to the position of the wireless power receiver, and C 2 is a capacitance value of the wireless power receiver.

6. The wireless power transmitter of claim 2 , wherein the mutual-change resonant frequency is variable depending on a relative position between the wireless power receiver and the repeating resonator corresponding to the position of the wireless power receiver.

7. The wireless power transmitter of claim 2 , wherein the repeating resonator is larger than a reception resonance coil in the wireless power receiver.

8. The wireless power transmitter of claim 2 , wherein each of the repeat resonators includes a same capacitor.

9. The wireless power transmitter of claim 1 , wherein the repeating resonant unit is spaced apart from the wireless power transmitter by a predetermined distance.

10. The wireless power transmitter of claim 1 , further comprising a transmitting unit that transmits the AC power, which is received from the power source, to the wireless power receiver using resonance.

11. The wireless power transmitter of claim 1 , wherein the transmitting unit comprise

Assignees

• Bae Su Ho
• Lg Innotek Co Ltd

Inventors

• Bae Su Ho

Classifications

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H04B5/0037 Primary

  Electricity · mapped topic

• H02J5/005

  Electricity · mapped topic

• H02J50/502 Primary

  the energy repeater being integrated together with the emitter or the receiver · CPC title

• H02J50/12

  of the resonant type · CPC title