WIRELESS POWER TRANSMISSION DEVICE AND WIRELESS POWER RECEPTION DEVICE

• US 20110133569A1
• Filed: 05/13/2010
• Published: 06/09/2011
• Est. Priority Date: 12/04/2009
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: ZYUNG, Tae Hyoung, CHEON, Sang Hoon, LEE, Jong Moo, KIM, Yong Hae, LEE, Myung Lae, KANG, Seung Youl
• Application Number:
  US12/779,241
• Publication Number:
  US 20110133569A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• 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

Provided are a wireless power transmission device and wireless power reception device. A power-relaying resonant coil is disposed between a power transmitter and a power receiver to increase transmission efficiency and lengthen a transmission distance. The wireless power transmission device includes a power generation module for generating power, a power coil for receiving the power, a transmitting coil for resonating at the unique resonant frequency due to magnetic induction with the power coil and generating a non-radiative electromagnetic wave, and one or more power relay coils for relaying the non-radiative electromagnetic wave.

Claims

1. A wireless power transmission device, comprising:

a power generation module for generating power;

a power coil for receiving the power;

a transmitting coil for resonating at a unique resonant frequency due to magnetic induction with the power coil, and generating a non-radiative electromagnetic wave; and

one or more power relay coils for relaying the non-radiative electromagnetic wave.

2. The wireless power transmission device of claim 1, wherein the power relay coils resonate at the same frequency as the transmitting coil.

3. The wireless power transmission device of claim 2, wherein each of the power relay coils includes a resonant frequency adjusting means for adjusting a unique resonant frequency of the power relay coil.

4. The wireless power transmission device of claim 3, wherein the resonant frequency adjusting means includes a variable capacitor.

5. The wireless power transmission device of claim 1, wherein a power transmission distance increases as a number of the power relay coils increases.

6. The wireless power transmission device of claim 1, wherein the power relay coils are disposed at apexes or edges of a polygon and relay the non-radiative electromagnetic wave inside the polygon.

7. The wireless power transmission device of claim 1, wherein the power relay coils are disposed around a circle and relay the non-radiative electromagnetic wave inside the circle.

8. A wireless power transmission device, comprising:

a power generation module for generating power;

a power coil for receiving the power;

a transmitting coil for resonating at a unique resonant frequency due to magnetic induction with the power coil, and generating a non-radiative electromagnetic wave; and

a control means for detecting power receivers and transmitting a signal indicating which one of the power receivers receives the power at a specific time in a time division method to the power receivers.

9. The wireless power transmission device of claim 8, wherein the control means includes:

a device detection means for detecting the power receivers and counting a number of the power receivers;

a processing means for determining time periods for which the respective power receivers receive the power in the time division method according to the number of the power receivers; and

a signal transmission means for transmitting the signal indicating which one of the power receivers receives the power at a specific time to the power receivers.

10. The wireless power transmission device of claim 8, wherein the transmitting coil includes a resonant frequency adjusting means for adjusting the unique resonant frequency of the transmitting coil.

11. The wireless power transmission device of claim 10, wherein the resonant frequency adjusting means includes a variable capacitor.

12. A wireless power reception device, comprising:

a receiving coil for receiving a non-radiative electromagnetic wave generated by a transmitting coil, and resonating at the same frequency as the transmitting coil;

a load coil for receiving energy stored in the receiving coil; and

a power receiving module for receiving power received by the receiving coil,

wherein the receiving coil includes a resonant frequency adjusting means for adjusting a unique frequency of the receiving coil to receive the non-radiative electromagnetic wave and resonate during a divided time period only.

13. The wireless power reception device of claim 12, wherein the resonant frequency adjusting means includes a capacitor and a switch, and adjusts the switch to equalize the unique resonant frequency of the receiving coil with a unique resonant frequency of the transmitting coil during the divided time period only.

14. The wireless power reception device of claim 13, wherein the resonant frequency adjusting means includes a control means for receiving a signal having information on a time period for which the power is received in a time division method, and controlling the switch according to the signal.

15. The wireless power reception device of claim 12, wherein the resonant frequency adjusting means includes a variable capacitor, and adjusts a capacitance of the variable capacitor to equalize the unique resonant frequency of the receiving coil with a unique resonant frequency of the transmitting coil during the divided time period only.

16. The wireless power reception device of claim 15, wherein the resonant frequency adjusting means includes a control means for receiving a signal having information on a time period for which the power is received in a time division method, and adjusting the capacitance of the variable capacitor according to the signal.