Wireless power transmission/reception apparatus and method

• US 8,633,615 B2
• Filed: 12/03/2009
• Issued: 01/21/2014
• Est. Priority Date: 10/07/2009
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Kwang Du, Kim, Kyung Uk, Kim, Jeong Hoon, Kim, Eung Ju
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): PEREZ BORROTO, ALFONSO
• Application Number:
  US12/630,348
• Publication Number:
  US 20110080051A1
• Time in Patent Office: 1,510 Days
• Field of Search: 307/104, 307/140, 307/149, 307/151, 363/21.02, 235/451
• US Class Current: 307/104
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• 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 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

Disclosed herein is a wireless power transmission/reception apparatus. The wireless power transmission/reception apparatus includes a wireless power transmission unit and a wireless power reception unit. The wireless power transmission unit receives power, generates a wireless power signal to be wirelessly transmitted, wirelessly transmits the generated wireless power signal in a magnetic resonance manner, receives a returned wireless power signal and detects the number of power consumption devices, and wirelessly transmits a wireless power signal using resonance frequency appropriate for the number of power consumption devices.

Claims

1. A wireless power transmission/reception apparatus, comprising:

a wireless power transmission unit for receiving power from an outside area, generating a wireless power signal to be wirelessly transmitted, and wirelessly transmitting the generated wireless power signal; and

a wireless power reception unit installed in each of the power consumption devices, and configured to receive the wireless power signal from the wireless power transmission unit in a magnetic resonance manner, provide the wireless power signal to at least one connected power consumption device, and return a remaining wireless power signal, not consumed by at least one unconnected power consumption device, to the wireless power transmission unit,

whereby, the wireless power transmission unit sets an initial resonance frequency, transmits a wireless power signal to the wireless power reception unit by using the initial resonance frequency, receives a returned wireless power signal returned from the wireless power reception units depending on the frequency adjustment while continuously tuning the frequency so as to search for a minimum inflection point of the returned wireless power signal, determines the minimum inflection point as a resonance frequency, detects the number of power consumption devices installed with wireless power reception units in a state of receiving wireless power signals depending on the determined resonance frequency and transmits the wireless power signals by using resonance frequency appropriate for the number of power consumption devices installed with wireless power reception units in the detected reception state.

2. The wireless power transmission/reception apparatus as set forth in claim 1, wherein the wireless power transmission unit comprises:

a power signal generator for receiving the power from the outside, and generating and outputting the wireless power signal, that is, power to be wirelessly transmitted;

a first resonance antenna comprised of an inductor and a capacitor, and configured to transmit the wireless power signal using resonance frequency depending on the inductor and the capacitor, and receive and output the returned wireless power signal output from the wireless power reception unit;

a directional power coupler having directionality so that the wireless power signal input from the power signal generator through a first port thereof is output to the first resonance antenna through a second port thereof and the returned wireless power signal input from the first resonance antenna through the second port is output through a third port thereof;

a power detector for detecting and outputting power of the returned wireless power signal output through the third port of the directional power coupler; and

a controller for determining whether the power consumption devices are connected based on intensity of power of the returned wireless power signal detected by the power detector, detecting the number of power consumption devices by using resonance frequency wherein a maximum power transmission is carried out, and in case of connection of power consumption devices, and controlling the first resonance antenna so that the wireless power signal is transmitted using power intensity appropriate for the detected number of power consumption devices.

3. The wireless power transmission/reception apparatus as set forth in claim 2, further comprising an impedance matcher disposed between the power signal generator and the first resonance antenna and configured to provide impedance matching between the power signal generator and the first resonance antenna.

4. The wireless power transmission/reception apparatus as set forth in claim 3, wherein the controller searches for a minimum inflection point of the returned wireless power signal received by the power detector while varying impedance of the impedance matcher, and sets the impedance of the impedance matcher to impedance corresponding to the found minimum inflection point.

5. The wireless power transmission/reception apparatus as set forth in claim 2, wherein the controller searches for a minimum inflection point of the returned wireless power signal received by the power detector while adjusting resonance frequency of the first resonance antenna and sets the resonance frequency of the first resonance antenna to a resonance frequency corresponding to the found minimum inflection point.

6. The wireless power transmission/reception apparatus as set forth in claim 2, wherein the power signal generator comprises:

an oscillator for receiving external power and generating a desired wireless power signal to be transmitted; and

a power amplifier for amplifying and outputting the wireless power signal generated by the oscillator.

7. A wireless power transmission unit, comprising:

a power signal generator for receiving power from an outside, and generating and outputting a wireless power signal, that is, power to be wirelessly transmitted;

a first resonance antenna comprised of an inductor and a capacitor, and configured to transmit the wireless power signal using resonance frequency depending on the inductor and the capacitor, and receive and output a returned wireless power signal returned from a wireless power reception unit;

a directional power coupler having directionality so that the wireless power signal input from the power signal generator through a first port thereof is output to the first resonance antenna through a second port thereof and the returned wireless power signal input from the first resonance antenna through the second port is output through a third port thereof;

a power detector for detecting and outputting power of the returned wireless power signal output through the third port of the directional power coupler; and

a controller for determining whether the power consumption devices are connected based on intensity of the power of the returned wireless power signal detected by the power detector, detecting the number of power consumption devices by using resonance frequency wherein a maximum power transmission is carried out, and in case of connection of power consumption devices, performing control so that the wireless power signal is transmitted using power intensity appropriate for the detected number of power consumption devices, setting an initial resonance frequency, transmitting a wireless power signal to the wireless power reception unit by using the initial resonance frequency, receiving a returned wireless power signal returned from the wireless power reception units depending on the frequency adjustment while continuously tuning the frequency so as to search for a minimum inflection point of the returned wireless power signal, determining the minimum inflection point as a resonance frequency, detecting the number of power consumption devices installed with wireless power reception units in a state of receiving wireless power signals depending on the determined resonance frequency and transmitting the wireless power signals using resonance frequency appropriate for the number of power consumption devices installed with wireless power reception units in the detected reception state.

8. The wireless power transmission unit as set forth in claim 7, further comprising an impedance matcher disposed between the power signal generator and the first resonance antenna and configured to provide impedance matching between the power signal generator and the first resonance antenna.

9. The wireless power transmission unit as set forth in claim 7, further comprising a battery charger for performing charging using the power of the returned wireless power signal detected by the power detector.

10. The wireless power transmission unit as set forth in claim 7, wherein the directional power coupler is a circulator.

11. The wireless power transmission unit as set forth in claim 8, wherein the controller searches for a minimum inflection point of the returned wireless power signal received by the power detector while varying impedance of the impedance matcher, and sets the impedance of the impedance matcher to an impedance corresponding to the found minimum inflection point.

12. The wireless power transmission unit as set forth in claim 7, wherein the controller searches for a minimum inflection point of the returned wireless power signal received by the power detector while adjusting resonance frequency of the first resonance antenna and sets the resonance frequency of the first resonance antenna to a resonance frequency corresponding to the found minimum inflection point.

13. A wireless power transmission/reception method, comprising:

a wireless power transmission unit transmitting a wireless power signal to a wireless power reception unit, being returned a remaining wireless power signal of the wireless power signal to be provided to a power consumption device in which the wireless power reception unit has been installed, and determining whether at least one power consumption device has been connected based on intensity of the power of the returned wireless power signal; and

the wireless power transmission unit, if at least one power consumption device is determined to have been connected, setting an initial resonance frequency, transmitting a wireless power signal to the wireless power reception unit by using the initial resonance frequency, receiving a returned wireless power signal returned from the wireless power reception units depending on the frequency adjustment while continuously tuning the frequency so as to search for a minimum inflection point of the returned wireless power signal, determining the minimum inflection point as a resonance frequency, detecting the number of power consumption devices installed with wireless power reception units in a state of receiving wireless power signals depending on the determined resonance frequency and transmitting a wireless power signal at a power intensity appropriate for the detected number of power consumption devices.

14. The wireless power transmission/reception method as set forth in claim 13, wherein the wireless power transmission unit transmitting a wireless power signal, being returned a remaining wireless power signal and determining whether at least one power consumption device has been connected comprises:

the wireless power transmission unit transmitting the wireless power signal to the wireless power reception unit in a magnetic resonance manner;

a power consumption device in which the wireless power reception unit has been installed receiving the transmitted wireless power signal, and returning the remaining wireless power signal; and

the wireless power transmission unit receiving the returned wireless power signal, detecting a power intensity, and determining whether a power consumption device has been connected.

15. The wireless power transmission/reception method as set forth in claim 13, wherein the wireless power transmission unit searching for a resonance frequency, detecting a number of power consumption devices and transmitting a wireless power signal comprises:

the wireless power transmission unit, if a power consumption device is determined to have been connected, searching for a minimum inflection point of the returned wireless power signal while varying resonance frequency; and

the wireless power transmission unit determining resonance frequency corresponding to the found minimum inflection point to be resonance frequency at which maximum power transmission is performed, detecting a number of power consumption devices using the resulting resonance frequency, and transmitting a wireless power signal at a power intensity appropriate for the detected number of power consumption devices.

16. A wireless power transmission method, comprising:

a wireless power transmission unit transmitting a wireless power signal to a wireless power reception unit;

the wireless power transmission unit receiving a returned wireless power signal from a wireless power reception unit, detecting a power intensity, and determining whether at least one power consumption device has been connected based on intensity of the power of the returned wireless power signal; and

the wireless power transmission unit, if at least one power consumption device is determined to have been connected, setting an initial resonance frequency, transmitting a wireless power signal to the wireless power reception unit by using the initial resonance frequency, receiving a returned wireless power signal returned from the wireless power reception units depending on the frequency adjustment while continuously tuning the frequency so as to search for a minimum inflection point of the returned wireless power signal, determining the minimum inflection point as a resonance frequency, detecting the number of power consumption devices installed with wireless power reception units in a state of receiving wireless power signals depending on the determined resonance frequency and transmitting a wireless power signal at a power intensity appropriate for the detected number of power consumption devices.

17. The wireless power transmission method as set forth in claim 16, wherein the wireless power transmission unit searching for a resonance frequency, detecting a number of power consumption devices and transmitting a wireless power signal comprises:

the wireless power transmission unit, if at least one power consumption device is determined to have been connected, searching for a minimum inflection point of a returned wireless power signal while varying resonance frequency; and

the wireless power transmission unit determining a resonance frequency corresponding to the found minimum inflection point to be a resonance frequency at which maximum power transmission is performed, detecting the number of power consumption devices using the determined resonance frequency, and transmitting a wireless power signal at a power intensity appropriate for the detected number of power consumption devices.