APPARATUS AND METHOD FOR REDUCING ELECTROMAGNETIC WAVE IN WIRELESS POWER TRANSMISSION DEVICE

• US 20170141615A1
• Filed: 09/16/2016
• Published: 05/18/2017
• Est. Priority Date: 07/17/2015
• Status: Active Grant

• Current Assignee: Dongyang E&P Inc., Electronics and Telecommunications Research Institute
• Original Assignee: Dongyang E&P Inc., Electronics and Telecommunications Research Institute
• Inventors: MOON, Jung Ick, JEON, Sang Bong, YUN, Je Hoon, BAEK, Seong Uk, LEE, Byoung In, LEE, Woo Chul, LEE, Jong Seup, CHEON, Dong Woo, AHN, Duk Ju, KIM, Byung Chan, JANG, Dong Won, CHO, In Kui, CHOI, Hyung Do, KIM, Seong Min
• Granted Patent: US 10,673,278 B2
• Time in Patent Office: Days
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

Provided is a wireless power transmission device to reduce an electromagnetic wave except for a signal to be transmitted during wireless power transmission, the wireless power transmission device including a transmitter configured to generate a magnetic field by inputting a high-frequency power signal generated by a transmission circuit into a first coil, a receiver configured to generate an induced current by allowing the generated magnetic field to pass through a second coil, and a reducer configured to reduce a harmonic component of the high-frequency power signal using a third coil inserted on a path between the transmitter and the receiver.

Claims

1. A wireless power transmission device to reduce an electromagnetic wave except for a signal to be transmitted during wireless power transmission, the wireless power transmission device comprising:

a transmitter configured to generate a magnetic field by inputting a high-frequency power signal generated by a transmission circuit into a first coil;

a receiver configured to generate an induced current by allowing the generated magnetic field to pass through a second coil; and

a reducer configured to reduce a harmonic component of the high-frequency power signal using a third coil inserted on a path between the transmitter and the receiver.

2. The wireless power transmission device of claim 1, wherein the high-frequency power signal is a square wave signal generated using a switching device of the transmission circuit.

3. The wireless power transmission device of claim 1, wherein the reducer is disposed to enclose at least one of the first coil or the second coil using the third coil with a diameter greater than or equal to a diameter of the first coil or the second coil.

4. The wireless power transmission device of claim 3, wherein the first coil and the second coil are each at least one of a solenoid loop coil or a helical loop coil.

5. The wireless power transmission device of claim 1, wherein the reducer is configured to adjust a reference frequency of the harmonic component to be reduced by adjusting an inductance or a number of turns of the third coil.

6. The wireless power transmission device of claim 1, wherein the reducer is configured to connect at least one of an impedance matching circuit or a resonant device to the third coil, and adjust a resonant frequency of the third coil to be less than or equal to a frequency domain of the harmonic component to be reduced using at least one of the impedance matching circuit or the resonant device.

7. The wireless power transmission device of claim 1, wherein the reducer is configured to attenuate an even mode signal of the harmonic component when a coiling direction of the third coil is the same as coiling directions of the first coil and the second coil, and attenuate an odd mode signal of the harmonic component when the coiling direction of the third coil is opposite to the coiling directions of the first coil and the second coil.

8. A method of reducing an electromagnetic wave except for a signal to be transmitted during power signal transmission in a wireless power transmission device, the method comprising:

generating a magnetic field by inputting a high-frequency power signal generated by a transmission circuit into a first coil;

reducing a harmonic component of the high-frequency power signal using a third coil inserted between the first coil and a second coil; and

generating an induced current by allowing a signal except for the reduced harmonic component in the generated magnetic field to pass through the second coil.

9. The method of claim 8, wherein the high-frequency power signal is a square wave signal generated using a switching device of the transmission circuit.

10. The method of claim 8, wherein the reducing comprises disposing the third coil to enclose at least one of the first coil or the second coil, the third coil with a diameter greater than or equal to a diameter of the first coil or the second coil.

11. The method of claim 10, wherein the first coil and the second coil are each at least one of a solenoid loop coil or a helical loop coil.

12. The method of claim 8, wherein the reducing comprises adjusting a reference frequency of the harmonic component to be reduced by adjusting an inductance or a number of turns of the third coil.

13. The method of claim 8, wherein the reducing comprises connecting at least one of an impedance matching circuit or a resonant device to the third coil, and adjusting a resonant frequency of the third coil to be less than or equal to a frequency domain of the harmonic component to be reduced using at least one of the impedance matching circuit or the resonant device.

14. The method of claim 8, wherein the reducing comprises attenuating an even mode signal of the harmonic component when a coiling direction of the third coil is the same as coiling directions of the first coil and the second coil, and attenuating an odd mode signal of the harmonic component when the coiling direction of the third coil is opposite to the coiling directions of the first coil and the second coil.

15. A method of reducing an electromagnetic wave except for a signal to be transmitted during power signal transmission in a wireless power transmission device, the method comprising:

generating a magnetic field by inputting a high-frequency power signal generated by a transmission circuit into a first coil;

reducing a harmonic component of the high-frequency power signal using a third coil disposed on a plane on which at least one of the first coil or a second coil is disposed; and

generating an induced current by allowing the generated magnetic field to pass through the second coil.

16. The method of claim 15, wherein the first coil and the second coil are each at least one of a solenoid loop coil or a helical loop coil.

17. The method of claim 15, wherein the reducing comprises adjusting a reference frequency of the harmonic component to be reduced by adjusting an inductance or a number of turns of the third coil.

18. The method of claim 15, wherein the reducing comprises connecting at least one of an impedance matching circuit or a resonant device to the third coil, and adjusting a resonant frequency of the third coil to be less than or equal to a frequency domain of the harmonic component to be reduced using at least one of the impedance matching circuit or the resonant device.