Magnetic material and device for transmitting data using the same

• US 9,922,761 B2
• Filed: 05/16/2017
• Issued: 03/20/2018
• Est. Priority Date: 07/29/2016
• Status: Active Grant

• Current Assignee: Wit Co., Ltd.
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Jang, Jae Hyuk, Kim, Hee Seung, Lee, Hyun Jung, Won, Jae Sun, Cho, Jung Young, Song, Yeong Hwan, Roh, Young Seung
• Primary Examiner(s): JACKSON, BLANE J
• Application Number:
  US15/596,204
• Publication Number:
  US 20180033534A1
• Time in Patent Office: 308 Days
• CPC Class Codes: H01F 1/047 Alloys characterised by their composition
• CPC Class Codes: H01F 1/15308 based on Fe/Ni H01F1/15325 takes precedence
• CPC Class Codes: H01F 1/15333 containing nanocrystallites, e.g. obtained by annealing
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 27/245 made from sheets, e.g. grain-oriented H01F27/26 takes precedence
• CPC Class Codes: H01F 27/25 made from strips or ribbons H01F27/26 takes precedence
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A device for transmitting data includes a transmitting coil configured to receive and transmit the data signal and to generate a magnetic field, and a magnetic material provided on one surface of the transmitting coil. A ratio of a residual magnetic flux density and a saturation magnetic flux density of the magnetic material is greater in a direction that the material is magnetized than in a direction the material is not magnetized.

Claims

1. A device for transmitting data, comprising:

a transmitting coil configured to receive and transmit a data signal and to generate a magnetic field from the data signal; and

a magnetic plate provided on one surface of the transmitting coil,

wherein the magnetic plate comprises a magnetic material in which a ratio of a residual magnetic flux density to a saturation magnetic flux density of the magnetic plate in a first direction is greater than a ratio of a residual magnetic flux density to a saturation magnetic flux density of the magnetic plate in a second direction, different from the first direction, and

the first direction corresponds to a direction of the magnetic field in the magnetic plate.

2. The device for transmitting data of claim 1, wherein the data signal includes pulses shifted from a first state to one of a second state or a third state and then shifted from the second state or the third state to the first state, and

a second time required for a portion of the pulses to be shifted from the second state or the third state to the first state is longer than a first time required for the portion of the pulses to be shifted from the first state to the second state or the third state.

3. The device for transmitting data of claim 2, wherein the data signal is a voltage signal, and

the first state is a state of 0 V, the second state is a state of a positive peak voltage, and the third state is a state of a negative peak voltage.

4. The device for transmitting data of claim 2, wherein the data signal includes pulses changed logarithmically over time, in sections, in a case in which the pulses are shifted from the second state or the third state to the first state.

5. The device for transmitting data of claim 2, wherein the data signal includes pulses changed exponentially over time, in sections, in a case in which the pulses are shifted from the second state or the third state to the first state.

6. The device for transmitting data of claim 2, wherein the data signal includes pulses changed step-wise over time, in sections, in a case in which the pulses are shifted from the first state to the second state or the third state, and

the data signal includes pulses changed linearly over time in sections in a case in which the pulses are shifted from the second state or the third state to the first state.

7. The device for transmitting data of claim 1, wherein 1 A/m≤

Hc≤

1*10⁴ A/m in which Hc is a magnetic field intensity in a BH curve of the magnetic plate.

8. The device for transmitting data of claim 1, wherein the magnetic plate comprises a magnetic permeability of 10 to 10⁵ at 2 Kilohertz (KHz).

9. The device for transmitting data of claim 1, wherein the magnetic plate is formed of at least one of an Fe—

Si—

B-based amorphous metal, an Fe—

Si—

B—

Nb—

Cu-based nanocrystalline metal, or an Fe—

Ni-M-T-based permalloy metal, wherein M represents a metal or metalloid and T represents another transition metal.

10. The device for transmitting data of claim 1, wherein the magnetic plate is formed using a metal ribbon annealed by a magnetic field applied thereto in the first direction and formed of at least one of an Fe—

Si—

B-based amorphous metal, an Fe—

Si—

B—

Nb—

Cu-based nanocrystalline metal, or an Fe—

Ni-M-T-based permalloy metal, wherein M represents a metal or metalloid and T represents another transition metal.

11. The device for transmitting data of claim 10, wherein the ratio of the residual magnetic flux density to the saturation magnetic flux density of the magnetic plate in the first direction is greater than 1:

2, and

the ratio of the residual magnetic flux density to the saturation magnetic flux density of the magnetic plate in the second direction is 1;

2 or less.

12. A magnetic material used in a device for transmitting data, generating a magnetic field to wirelessly transmit data, comprising:

a material having a ratio of a residual magnetic flux density to a saturation magnetic flux density of the magnetic material in a first direction greater than a ratio of a residual magnetic flux density to a saturation magnetic flux density of the magnetic material in a second direction, different from the first direction,

wherein the first direction corresponds to a direction of the magnetic field in the magnetic material.

13. The magnetic material of claim 12, wherein the ratio of the residual magnetic flux density to the saturation magnetic flux density of the magnetic material in the first direction is greater than 1:

2.

14. The magnetic material of claim 12, wherein 1 A/m≤

Hc≤

1*10⁴ A/m in which Hc represents a magnetic field intensity in a BH curve of the magnetic material.

15. The magnetic material of claim 12, wherein the magnetic material has a magnetic permeability of 10 to 10⁵ at 2 Kilohertz (KHz).

16. The magnetic material of claim 12, wherein the magnetic material is formed by applying a magnetic field to a metal ribbon in the first direction to anneal the metal ribbon, the metal ribbon being formed of at least one of an Fe—

Si—

B-based amorphous metal, an Fe—

Si—

B—

Nb—

Cu-based nanocrystalline metal, or an Fe—

Ni-M-T-based permalloy metal, wherein M represents a metal or metalloid and T represents another transition metal.

17. A transmitter comprising:

a magnetized plate having a ratio of a residual magnetic flux density (Br_p) to a saturation magnetic flux density (Bsat_p) greater in a first direction the magnetized plate is magnetized than in a second direction in which the magnetized plate is not magnetized; and

a coil formed adjacent to the magnetized plate, wherein the coil is wound orthogonally to the first direction.

18. The transmitter of claim 17, wherein the coil is formed directly on the magnetized plate.

19. The transmitter of claim 17, wherein:

the magnetized plate comprises a first magnetized plate and a second magnetized plate spaced apart from the first magnetized plate and magnetized in the first direction; and

the coil comprises a first coil formed adjacent to the first magnetized plate and a second coil formed adjacent to the second magnetized plate,

wherein the second coil is wound orthogonally to the first direction.

20. The transmitter of claim 19, wherein the first coil and second coil are wound in opposite directions having currents supplied in a same direction or the first coil and the second coil are wound in a same direction having currents supplied in opposite directions.