Apparatus and method for transmitting wireless power by using resonant coupling and system for the same

• US 9,496,731 B2
• Filed: 01/22/2013
• Issued: 11/15/2016
• Est. Priority Date: 01/20/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Sung-Kweon, Ko, Kil-Soo, Kim, Ki-Hyun, Park, Se-Ho, Park, Jin-Hyoung, Lee, Sea-Young, Lee, Young-Min, Jung, Hee-Won, Kim, Hong-Kweun, Han, Seung-Woo
• Primary Examiner(s): Dinh, Paul
• Application Number:
  US13/747,079
• Publication Number:
  US 20130187598A1
• Time in Patent Office: 1,393 Days
• Field of Search: 307/104, 320107-108, 320/111
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

Disclosed are an apparatus and a method for charging power using a resonant coupling. The apparatus includes a transmission power converter for converting Direct Current (DC) power to Alternating Current (AC) power, a controller for adjusting a Q factor of a transmission resonator by using a frequency of the converted AC power and a resonant frequency of the transmission resonator and controlling adaptive impedance matching, and a transmission resonator for wirelessly transmitting the converted AC power to a receiver through the adjusted Q factor and the controlled adaptive impedance matching, the transmission resonator having a coil installed in the transmitter.

Claims

1. An apparatus for transmitting wireless power of a transmitter using a resonant coupling, the apparatus comprising:

a transmission power converter which converts Direct Current (DC) power to Alternating Current (AC) power;

a transmission resonator having a coil installed in the transmitter; and

a controller which matches a frequency of the converted AC power and a resonant frequency of the transmission resonator by adjusting a Q factor of the transmission resonator,

wherein the controller adjusts the Q factor by multiplying the resonant frequency of the transmission resonator by inductance of the coil and then dividing a result by a radiation loss due to a resistor of the transmission resonator, and

wherein the transmission resonator wirelessly transmits the converted AC power to a receiver after the Q factor is adjusted.

2. The apparatus of claim 1, wherein the coil is installed in an inner side surface of the transmitter or an upper surface of a charging pad of the transmitter.

3. The apparatus of claim 1, wherein the controller controls an adaptive impedance matching.

4. The apparatus of claim 1, wherein the Q factor is calculated by

5. The apparatus of claim 1, wherein the controller adjusts the Q factor by dividing the resonant frequency of the transmission resonator by a frequency of a point which is 3 dB lower than a maximum value of the converted AC power.

6. The apparatus of claim 1, wherein the Q factor is calculated by

7. The apparatus of claim 1, wherein the controller controls inductance and capacitance of the transmission resonator and controls an adaptive impedance matching by matching the resonance frequency changed according to a distance and an arrangement between the transmission resonator of the transmitter and a reception resonator of the receiver with the frequency of the AC power.

8. A method of transmitting wireless power of a transmitter using a resonant coupling, the method comprising:

converting Direct Current (DC) power to Alternating Current (AC) power;

matching a frequency of the converted AC power and a resonant frequency of a transmission resonator of the transmitter by adjusting a Q factor of the transmission resonator; and

wirelessly transmitting the converted AC power to a receiver through the transmission resonator after the Q factor is adjusted,

wherein a coil is installed in the transmitter, and

wherein adjusting the Q factor comprises multiplying the resonant frequency of the transmission resonator by inductance of the coil and then dividing a result by a radiation loss due to a resistor of the transmission resonator.

9. The method of claim 8, further comprising controlling an adaptive impedance matching.

10. The method of claim 8, wherein adjusting the Q factor further comprises dividing the resonant frequency of the transmission resonator by a frequency of a point which is 3 dB lower than a maximum value of the converted AC power.

11. The method of claim 8, wherein adjusting the Q factor further comprises controlling inductance and capacitance of the transmission resonator by matching the resonance frequency changed according to a distance and an arrangement between the transmission resonator of the transmitter and a reception resonator of the receiver with the frequency of the AC power.