Method and apparatus for wireless power transmission with harmonic noise cancellation

Abstract

A wireless power transmission apparatus includes a source resonator configured to transmit an output power from which a harmonic component has been cancelled to a wireless power reception apparatus by resonating with a target resonator of the wireless power transmission apparatus, and a resonant power generator configured to differentially input a first input signal and a second input signal to the source resonator, and cancel the harmonic component of the output power.

What is claimed is: 
     
       1. A wireless power transmission apparatus comprising:
 a resonant power generator comprising a first power amplifier configured to output a first power signal and a second power amplifier configured to output a second power signal, the first amplifier including a first notch filter configured so that a third harmonic of the first power signal is canceled, and the second amplifier including a second notch filter configured so that a third harmonic of the second power signal is canceled, 
 a low-pass filter (LPF) configured to cancel fifth and higher odd-order harmonic components of the first power signal and the second power signal; and 
 a source resonator configured to differentially receive the LPF-filtered first power signal and the LPF-filtered second power signal and wirelessly transmit an output power to a wireless power reception apparatus by resonating based on resonant coupling with a target resonator of the wireless power reception apparatus, wherein 
 the transmitted output power has a predetermined frequency band; and 
 a resonant power generator comprising first and second notch filters coupled to a low-pass filter (LPF), 
 wherein the first and second notch filters are configured to cancel a third harmonic component of the output power, and the LPF is configured to cancel a fifth or higher odd-order harmonic component of the output power, 
 wherein the resonant power generator is configured to differentially input a first input signal and a second input signal to the source resonator, and 
 the first power signal and the second power signal have a phase difference of 180 degrees to cancel an even-order harmonic component of the outputtransmitted power, and 
 wherein the source resonator is further configured to transmit the output power from which the third harmonic component and the fifth or higher odd-order harmonic component have been cancelled to the wireless power reception apparatus. 
 
     
     
       2. The apparatus of  claim 1 , wherein the resonant power generator comprises:
 a first power amplifier configured to generate the first input signal; and   a second power amplifier configured to generate the second input signal.   
     
     
       3. The apparatus of claim  2  1, wherein the resonant power generator further comprises:
 a first driving circuit coupled to the first power amplifier; and 
 a second driving circuit coupled to the second power amplifier. 
 
     
     
       4. The apparatus of  claim 3 , wherein the first driving circuit and the second driving circuit are configured to generate supply first and second signals having a 180 degree phase difference between to the first input signal amplifier and the second input signal amplifier respectively. 
     
     
       5. The apparatus of  claim 2 , wherein the first power amplifier comprises the first notch filter;
 the second power amplifier comprises the second notch filter; and   the resonant power generator is further configured to cancel the third harmonic component of the output power using the first notch filter and the second notch filter.   
     
     
       6. The apparatus of claim  5  1, wherein the first notch filter and the second notch filter are configured to match an output impedance of the wireless power transmission apparatus to an input impedance of the wireless power reception apparatus. 
     
     
       7. The apparatus of  claim 5 , wherein the LPF coupled to the first and second notch filters of the resonant power generator is further coupled to the source resonator. 
     
     
       8. The apparatus of claim  2  1, wherein the first power amplifier and the second power amplifier are Class-E amplifiers. 
     
     
       9. The apparatus of  claim 1 , wherein the source resonator is further configured to receive the LPF-filtered first input power signal and the LPF-filtered second input power signal via a differential input port comprising a separate grounding unit. 
     
     
       10. The apparatus of  claim 1 , wherein the predetermined frequency band is of the transmitted power includes a frequency of 6.78 MHz. 
     
     
       11. The apparatus of  claim 1 , wherein the predetermined frequency band is tens of Hz. 
     
     
       12. A wireless power transmission apparatus comprising:
 a source resonator configured to wirelessly transmit an output power to a wireless power reception apparatus by resonating based on resonant coupling with a target resonator of the wireless power reception apparatus; 
 a resonant power generator comprising:
 a first power amplifier comprising including a first notch filter and configured to generate a first input power signal; and 
 a second power amplifier comprising including a second notch filter and configured to generate a second input power signal;, 
 
 a low-pass (LPF) coupled to the source resonator and configured to cancel fifth and higher odd-order harmonic components of the first power signal and the second power signal, 
 wherein the first notch filter and the second notch filter are coupled to the LPF and are configured so that third harmonic components of the first power signal and the second power signal are canceled, 
 wherein the resonant power generator source resonator is configured to cancel an even-order harmonic component of the output power by differentially inputting receive the LPF-filtered first input power signal and the LPF-filtered second input power signal to the source resonator, and 
 the first power signal and the second power signal have a phase difference of 180 degrees to cancel a third harmonic component of the output power using the first notch filter and the second notch filter; and 
 a low-pass filter (LPF) coupled to the first and second notch filters and configured to cancel a fifth or higher odd-order harmonic component of the output power; 
 wherein the source resonator is further configured to transmit, to the wireless power reception apparatus, the output power from which the even-order harmonic component, the third harmonic component, and the fifth or higher odd-order harmonic component have been cancelled an even-order harmonic component of the transmitted power. 
 
     
     
       13. A wireless power transmission method in a wireless power transmission apparatus, the method comprising:
 generating, via a first power amplifier of a resonant power generator, a first input power signal and a second input signal; 
 generating, via a second power amplifier of the resonant power generator, a second power signal, 
 canceling, via first and second notch filters, a third harmonic of the first power signal and a third harmonic of the second power signal, 
 differentially inputting, via the resonant power generator, the first input signal and the second input signal to a source resonator and cancelling an even-order harmonic component of the output power; 
 cancelling, via a low-pass filter (LPF) and first and second notch filters coupled to the LPF, a harmonic component comprising a third harmonic component and a fifth or and higher odd-order harmonic component components of an output the first power signal and the second power of the source resonator signal; and 
 differentially providing the LPF-filtered first power signal and the LPF-filtered second power signal to a source resonator; and 
 wirelessly transmitting, via the source resonator, the output by the source resonator, power from which the harmonic component including the third harmonic component and the fifth or higher odd-order harmonic component has been cancelled to a wireless power reception apparatus by resonating based on resonant coupling with a target resonator of the wireless power reception apparatus, 
 wherein an even-order harmonic component of the transmitted power is canceled based on the first power signal and the second power signal having a 180 degree phase difference. 
 
     
     
       14. The method of  claim 13 , wherein the cancelling of the harmonic component of the output power comprises:
 generating the first input signal using a first power amplifier; and   generating the second input signal using a second power amplifier.   
     
     
       15. The method of claim  14  13, wherein the cancelling of the harmonic component of the output power further comprises further comprising 
 generating a 180 degree phase difference between the first input power signal and the second input power signal using a first driving circuit coupled to the first power amplifier and a second driving circuit coupled to the second power amplifier. 
 
     
     
       16. The method of  claim 14 , wherein the first power amplifier comprises a first notch filter;
 the second power amplifier comprises a second notch filter; and   the cancelling of the harmonic component of the output power further comprises cancelling the third harmonic component of the output power using the first notch filter and the second notch filter.   
     
     
       17. The method of claim  16  13, wherein the first notch filter and the second notch filter are configured to match an output impedance of the wireless power transmission apparatus to an input impedance of the wireless power reception apparatus. 
     
     
       18. The method of claim  16  13, wherein the LPF is further coupled to the source resonator. 
     
     
       19. A non-transitory computer-readable storage medium storing instructions for controlling which, when executed, cause a computer to control an electronic device to perform the method of  claim 13 :
 generating, via a first power amplifier of a resonant power generator, a first power signal; 
 generating, via a second power amplifier of a resonant power generator, a second power signal; 
 canceling, via first and second notch filters, a third harmonic of the first power signal and a third harmonic of the second power signal; 
 cancelling, via a low-pass filter (LPF) fifth and higher odd-order harmonic components of the first power signal and the second power signal; 
 differentially providing the filtered first power signal and the filtered second power signal to a source resonator; and 
 wirelessly transmitting, by the source resonator, the power to a wireless power reception apparatus based on resonant coupling with a target resonator of the wireless power reception apparatus, 
 wherein an even-order harmonic component of the transmitted power is canceled based on the first power signal and the second power signal having a 180 degree phase difference.