Wireless power repeater and wireless power transmitter
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.
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 comprises:
a transmission coil unit receiving the AC power from the power source to generate a magnetic field; and
a transmission resonant coil unit transmitting power generated by the magnetic field to the repeating resonant unit using resonance,
wherein the transmission resonant coil unit is coupled with the transmission coil unit.
12. The wireless power transmitter of claim 1 , wherein the wireless power transmitter previously stores information about frequencies to be changed.
13. A wireless power repeater which wirelessly transfers power to a wireless power receiver using resonance, the wireless power repeater comprising:
a plurality of repeating resonators,
wherein the wireless power repeater transfers AC power having a mutual-change resonant frequency, which results from a mutual inductance component between a wireless power transmitter and the repeating resonators, to the wireless power receiver, and
wherein the repeating resonators are arranged in a form of a lattice or a matrix in a repeating pad.
14. The wireless power repeater of claim 13 , wherein a resonant frequency of each repeating resonator is different from a resonant frequency of the wireless power receiver.
15. The wireless power repeater of claim 13 , 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.
16. The wireless power repeater of claim 13 , 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.
17. The wireless power repeater of claim 13 , 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.
18. The wireless power transmitter of claim 11 , wherein the transmission resonant coil unit includes a variable capacitor.