Communication system using wireless power

• US 9,172,434 B2
• Filed: 06/07/2012
• Issued: 10/27/2015
• Est. Priority Date: 06/24/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwon, Ui Kun, Kim, Sang Joon
• Primary Examiner(s): NGUYEN, LEON VIET Q
• Application Number:
  US13/490,751
• Publication Number:
  US 20120328043A1
• Time in Patent Office: 1,237 Days
• Field of Search: 375/295, 455/41.1
• US Class Current: 1/1
• 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 5/26 using coils
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

Provided are apparatuses, systems and methods for performing communication using wireless power. According to one general aspect, a communication device using wireless power may include: a controller configured to determine whether a mutual resonance occurs between a target resonator and a source resonator; and a modulator configured to modulate data based on whether the mutual resonance occurs.

Claims

1. A communication device using wireless power, the communication device comprising:

a controller configured to determine whether a mutual resonance occurs between a target resonator and a source resonator in a symbol duration; and

a modulator configured to modulate data, based on whether the mutual resonance occurs;

a charger configured to charge an inductor and a capacitor using power through the mutual resonance;

a power delivering unit configured to deliver power stored in the capacitor to a load; and

a switch controller configured to control a switch that connects the capacitor to the charger or to the power delivering unit, based on a determination of the controller,

wherein the target resonator includes the inductor and the capacitor.

2. The communication device of claim 1, wherein the switch controller is configured to control the switch to connect the capacitor to the charger so as to generate the mutual resonance.

3. The communication device of claim 1,

wherein the power delivering unit is configured to deliver power stored in the inductor and the capacitor to the load;

and

wherein the switch controller is configured to control the switch that connects the capacitor to the power delivering unit, based on a determination of the controller.

4. The communication device of claim 3, wherein the controller is configured to:

change a resonant frequency of the target resonator; and

capture power stored in the target resonator within a predetermined period of time.

5. The communication device of claim 1, further comprising:

a demodulator configured to demodulate data based on an amount of power stored in the target resonator, in response to a termination of the mutual resonance.

6. The communication device of claim 1, wherein the controller is configured to control a timing of the mutual resonance occurring between the source resonator and the target resonator.

7. The communication device of claim 1, further comprising:

an envelope detector configured to detect an envelope in a waveform of current or voltage applied to the target resonator.

8. The communication device of claim 7, wherein the envelope detector is configured to acquire the envelope from an output of an analog circuit for detecting an envelope in response to an input of the current or the voltage.

9. The communication device of claim 7, wherein the envelope detector comprises:

a down conversion unit configured to generate a down-converted signal by multiplying one of predetermined signal waveforms of a resonant frequency by a signal that is analog-digital conversion (ADC) sampled from the current or the voltage;

a transformer configured to transform the down-converted signal into a frequency domain signal using the discrete Fourier transform (DFT) or the fast Fourier transform (FFT);

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the frequency domain signal; and

an inverse transformer configured to transform the signal from which a harmonic component is removed into a time domain signal using the inverse DFT or the inverse FFT.

10. The communication device of claim 7, wherein the envelope detector comprises:

a transformer configured to transform a signal that is analog-digital conversion (ADC) sampled from the current or the voltage into a frequency domain signal using the discrete Fourier transform (DFT) or the fast Fourier transform (FFT);

a circular shifter configured to perform a circular shift of the frequency domain signal by a predetermined frequency;

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the circular-shifted signal; and

an inverse transformer configured to transform the signal from which a harmonic component is removed into a time domain signal using the inverse DFT or the inverse FFT.

11. The communication device of claim 7, wherein the envelope detector comprises:

a down conversion unit configured to generate a down-converted signal by multiplying one of predetermined signal waveforms of a resonant frequency by a signal that is analog-digital conversion (ADC) sampled from the current or the voltage; and

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the down-converted signal using convolution in a time domain.

24. The communication device of claim 1, wherein the controller is further configured to change a resonant frequency of the target resonator in the symbol duration.

25. The communication device of claim 1, wherein the symbol duration is a period of time used for transmitting a bit of data information.

26. The communication device of claim 1, wherein the controller is further configured to control the target resonator and the source resonator to mutually resonate within a predetermined symbol duration.

12. A communication device using wireless power, the communication device comprising:

a receiver configured to receive data from a target resonator through a mutual resonance between a source resonator and the target resonator; and

a demodulator configured to demodulate the data in a symbol duration, based on an amount of power stored in the source resonator;

a power charger configured to charge the source resonator using power provided from a power supply device; and

a modulator configured to control the amount of power stored in the source resonator, and modulate data, based on the amount of power.

13. The communication device of claim 12, further comprising:

a controller configured to control a charging time of the source resonator.

14. The communication device of claim 12, wherein the demodulator is configured to demodulate the data by comparing an amount of power stored in the source resonator when the mutual resonance occurs between the source resonator and the target resonator with an amount of power stored in the source resonator when the mutual resonance does not occur between the source resonator and the target resonator.

15. The communication device of claim 12, wherein the demodulator is configured to demodulate the data based on whether the mutual resonance occurs between the source resonator and the target resonator.

16. The communication device of claim 12, further comprising:

an envelope detector configured to detect an envelope in a waveform of current or voltage applied to the source resonator.

17. The communication device of claim 16, wherein the demodulator is configured to determine whether the mutual resonance occurs between the source resonator and the target resonator, by comparing the detected envelope with a predetermined value, and demodulate the data, based on whether the mutual resonance occurs.

18. The communication device of claim 16, wherein the envelope detector is configured to acquire the envelope from an output of an analog circuit for detecting an envelope in response to an input of the current or the voltage.

19. The communication device of claim 16, wherein the envelope detector comprises:

a down conversion unit configured to generate a down-converted signal by multiplying one of predetermined signal waveforms of a resonant frequency by a signal that is analog-digital conversion (ADC) sampled from the current or the voltage;

a transformer configured to transform the down-converted signal into a frequency domain signal using the discrete Fourier transform (DFT) or the fast Fourier transform (FFT);

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the frequency domain signal; and

an inverse transformer configured to transform the signal from which a harmonic component is removed into a time domain signal using the inverse DFT or the inverse FFT.

20. The communication device of claim 16, wherein the envelope detector comprises:

a transformer configured to transform a signal that is analog-digital conversion (ADC) sampled from the current or the voltage into a frequency domain signal using the discrete Fourier transform (DFT) or the fast Fourier transform (FFT);

a circular shifter configured to perform a circular shift of the frequency domain signal by a predetermined frequency;

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the circular-shifted signal; and

an inverse transformer configured to transform the signal from which a harmonic component is removed into a time domain signal using the inverse DFT or the inverse FFT.

21. The communication device of claim 16, wherein the envelope detector comprises:

a down conversion unit configured to generate a down-converted signal by multiplying one of predetermined signal waveforms of a resonant frequency by a signal that is analog-digital conversion (ADC) sampled from the current or the voltage; and

a filtering unit configured to generate a signal from which a harmonic component is removed by applying low-pass filtering to the down-converted signal using convolution in a time domain.

22. A communication method using wireless power, the method comprising:

determining whether a mutual resonance occurs between a target resonator and a source resonator in a symbol duration;

modulating data based on whether the mutual resonance occurs;

charging an inductor and a capacitor, by using power through the mutual resonance;

delivering power stored in the capacitor to a load; and

controlling a switch that connects the capacitor to the charger or to the power delivering unit, based on a determination of the controller,

wherein the target resonator includes the inductor and the capacitor.

23. A communication method using wireless power, the method comprising:

receiving data from a target resonator through a mutual resonance between a source resonator and the target resonator;

demodulating the data in a symbol duration based on an amount of power stored in the source resonator;

charging the source resonator, by using power provided from a power supply device;

controlling the amount of power stored in the source resonator; and

modulating data based on the amount of power.