Apparatus and method for shielding leakage magnetic field in wireless power transmission system

Patent metadata

Field	Value
Publication number	US-9355773-B2
Application number	US-201313957950-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Aug 7, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A leakage magnetic field shielding apparatus includes a resonator configured to counterbalance a leakage magnetic field generated when a source resonator and a target resonator resonate at a resonant frequency of the source resonator and the target resonator.

First claim

What is claimed is:

1. A leakage magnetic field shielding apparatus comprising:
a resonator configured to counterbalance a leakage magnetic field generated when a source resonator and a target resonator resonate at a resonant frequency of the source resonator and the target resonator.

2. The leakage magnetic field shielding apparatus of claim 1 , wherein the leakage magnetic field causes the resonator to generate a counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field.

3. The leakage magnetic field shielding apparatus of claim 1 , wherein the leakage magnetic field excites a current in the resonator;
the current in the resonator generates a counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field; and
the counterbalance magnetic field has an intensity that is equal to an intensity of the leakage magnetic field.

4. The leakage magnetic field shielding apparatus of claim 1 , wherein the leakage magnetic field excites a current in the resonator;
the current in the resonator generates a counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field; and
the counterbalance magnetic field has a phase that is opposite to a phase of the leakage magnetic field.

5. The leakage magnetic field shielding apparatus of claim 1 , wherein the resonator comprises a loop circuit configured to generate a counterbalance magnetic field having an intensity that is equal to an intensity of the leakage magnetic field, and a phase that is opposite to a phase of the leakage magnetic field.

6. The leakage magnetic field shielding apparatus of claim 1 , further comprising at least one additional resonator configured to counterbalance the leakage magnetic field generated when the source resonator and the target resonator resonate at the resonant frequency;
wherein a total number of resonators of the leakage magnetic shielding apparatus depends on an intensity and a phase of the leakage magnetic field.

7. A leakage magnetic field shielding apparatus comprising:
a power supply unit configured to supply power to be used to counterbalance a leakage magnetic field generated when a source resonator and a target resonator resonate at a resonant frequency of the source resonator and the target resonator; and
a counterbalance magnetic field generator configured to generate a counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field using the power supplied by the power supply unit.

8. The leakage magnetic field shielding apparatus of claim 7 , wherein the power supply unit is further configured to control a magnitude of the power supplied by the power supply unit based on an intensity of the leakage magnetic field.

9. The leakage magnetic field shielding apparatus of claim 7 , wherein the power supply unit is further configured to control a phase of the power supplied by the power supply unit based on a phase of the leakage magnetic field.

10. The leakage magnetic field shielding apparatus of claim 7 , wherein the power supply unit comprises:
a power source configured to supply power; and
a capacitor configured to generate power in response to the leakage magnetic field.

11. A wireless power transmission system comprising:
a source resonator configured to generate a power transmission magnetic field and a leakage magnetic field at a resonant frequency of the source resonator;
a target resonator configured to generate power in response to the power transmission magnetic field, the target resonator having a resonant frequency that is equal to the resonant frequency of the source resonator; and
a leakage magnetic field shielding apparatus configured to generate a counterbalance magnetic field to counterbalance the leakage magnetic field.

12. The wireless power transmission system of claim 11 , wherein the leakage magnetic field shielding apparatus comprises a resonator configured to generate the counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field in response to the leakage magnetic field.

13. The wireless power transmission system of claim 12 , wherein the leakage magnetic field causes the resonator to generate the counterbalance magnetic field at the resonant frequency set to counterbalance the leakage magnetic field.

14. The wireless power transmission system of claim 11 , wherein the leakage magnetic field shielding apparatus comprises:
a power supply unit configured to supply power to be used to counterbalance the leakage magnetic field; and
a counterbalance magnetic field generator configured to generate the counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field using the power supplied by the power supply unit.

15. The wireless power transmission system of claim 11 , wherein a location and an angle at which the leakage magnetic field shielding apparatus is installed are determined based on an intensity and a direction of the leakage magnetic field.

16. A leakage magnetic field shielding method comprising:
generating a counterbalance magnetic field to counterbalance a leakage magnetic field generated when a source resonator and a target resonator resonate at a resonant frequency of the source resonator and the target resonator.

17. The leakage magnetic field shielding method of claim 16 , wherein the generating comprises generating the counterbalance magnetic field with a resonator having a resonant frequency set to counterbalance the leakage magnetic field;
the leakage magnetic field excites a current in the resonator; and
the current in the resonator generates the counterbalance magnetic field at the resonant frequency set to counterbalance the leakage magnetic field so that an intensity of the counterbalance magnetic field is equal to an intensity of the leakage magnetic field.

18. The leakage magnetic field shielding method of claim 16 , wherein the generating comprises generating the counterbalance magnetic field with a resonator having a resonant frequency set to counterbalance the leakage magnetic field;
the leakage magnetic field excites a current in the resonator; and
the current in the resonator generates the counterbalance magnetic field at the resonant frequency set to counterbalance the leakage magnetic field so that a phase of the counterbalance magnetic field is opposite to a phase of the leakage magnetic field.

19. A leakage magnetic field shielding method comprising:
supplying power to be used to counterbalance a leakage magnetic field generated when a source resonator and a target resonator resonate at a resonant frequency of the source resonator and the target resonator; and
generating a counterbalance magnetic field at a resonant frequency set to counterbalance the leakage magnetic field using the supplied power.

20. The leakage magnetic field shielding method of claim 19 , wherein the supplying comprises controlling a magnitude of the supplied power based on an intensity of the leakage magnetic field.

21. The leakage magnetic field shielding method of claim 19 , wherein the supplying comprises controlling a phase of the supplied power based on a phase of the leakage magnetic field.

22. A leakage magnetic field shielding apparatus comprising:
a device configured to generate a counterbalance magnetic field to counterbalance a leakage magnetic field generated during wireless power transmission.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Jae Hyun
• Ryu Young Ho
• Kwon Sang Wook
• Kim Ki Young
• Park Yun Kwon
• Song Keum Su
• Ahn Chi Hyung

Classifications

• H02J50/10

  using inductive coupling · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• B60L53/65

  involving identification of vehicles or their battery types · CPC title

• H01F27/346

  Preventing or reducing leakage fields (using magnetic shields H01F27/36; using auxiliary windings H01F27/38) · CPC title