KR20140015074A - Power inductor - Google Patents

Power inductor Download PDF

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Publication number
KR20140015074A
KR20140015074A KR1020120082778A KR20120082778A KR20140015074A KR 20140015074 A KR20140015074 A KR 20140015074A KR 1020120082778 A KR1020120082778 A KR 1020120082778A KR 20120082778 A KR20120082778 A KR 20120082778A KR 20140015074 A KR20140015074 A KR 20140015074A
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KR
South Korea
Prior art keywords
coating layer
oxide coating
powder
oxide
power inductor
Prior art date
Application number
KR1020120082778A
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Korean (ko)
Inventor
천민경
김명기
Original Assignee
삼성전기주식회사
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Priority to KR1020120082778A priority Critical patent/KR20140015074A/en
Publication of KR20140015074A publication Critical patent/KR20140015074A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
    • H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
    • H01F1/0054—Coated nanoparticles, e.g. nanoparticles coated with organic surfactant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0311—Compounds
    • H01F1/0313—Oxidic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices

Abstract

The present invention provides a power inductor including a magnetic main body including double-coated powder; an inner electrode formed in the magnetic main body; and an outer electrode electrically connected to the inner electrode and formed on the outside of the magnetic main body. The double-coated powder includes metallic magnetic powder, a first oxide coating layer formed on the metallic coating powder, and a second oxide coating layer formed on the first oxide coating layer and including a different oxide from an oxide of the first oxide coating layer.

Description

Power Inductor

The present invention relates to a power inductor having a high saturation magnetization value and ensuring insulation and anti-oxidation characteristics so that the change in inductance value is small and the capacity is maximized.

Electronic components using ceramic materials include capacitors, inductors, piezoelectric elements, varistors and thermistors.

The inductor of the ceramic electronic component is one of the important passive components of the electronic circuit together with the resistor and the capacitor. The inductor may be mainly used to remove noise or form an LC resonant circuit.

Such an inductor can be manufactured by winding a coil on a ferrite core or by printing and forming electrodes at both ends, or by printing internal electrodes on a magnetic material or a dielectric and then stacking them.

Such inductors can be classified into various types such as a laminated type, a wire wound type, and a thin film type according to their structures. The inductors of the inductors differ not only in the applicable range but also in the manufacturing method thereof.

The power inductor may be manufactured in the form of a laminate in which ceramic sheets made of a plurality of ferrite or low dielectric constant dielectrics are laminated.

At this time, a coil-shaped metal pattern is formed on the ceramic sheet. The coil-shaped metal patterns formed on the ceramic sheets are sequentially connected by conductive vias formed on the respective ceramic sheets, It is possible to obtain a structure in which the layers are superimposed along the direction.

The inductor body constituting such a power inductor is conventionally constructed by using a ferrite material composed of a quaternary material of nickel (Ni) - zinc (Zn) - copper (Cu) - iron (Fe).

However, such a ferrite material has a lower saturation magnetization value than that of a metal material, and thus can not achieve the high current characteristics required by recent electronic products.

Therefore, when the inductor main body constituting the power inductor is constituted by using a metal component, the saturation magnetization value can be relatively increased as compared with the above-described inductor main body made of ferrite, but in this case, eddy current loss and hysteresis loss So that the loss of the material is increased.

In order to reduce the loss of such materials, conventionally, a structure that insulates between metal powders with a polymer resin is applied, but in this case, the volume fraction of the metal is lowered, so that the effect of increasing the saturation magnetization value, which is an advantage of the metal component described above, is properly applied. The problem could not be implemented.

Prior art document 1 discloses that a metal magnetic body covering the surface of the metal magnetic powder is covered with glass, but it is difficult to implement a capacity and there is a problem in that DC bias (DC-bias) characteristics are deteriorated.

Japanese Laid-Open Patent Publication 2008-226960

The present invention relates to a power inductor having a high saturation magnetization value and ensuring insulation and anti-oxidation characteristics so that the change in inductance value is small and the capacity is maximized.

One embodiment of the invention is a magnetic body comprising a double coated powder; Internal electrodes formed in the magnetic body; And an external electrode formed outside the magnetic body and electrically connected to the internal electrode. The double coated powder includes a metal magnetic powder, a first oxide coating layer formed on the metal magnetic powder, and a second oxide formed on the first oxide coating layer and made of an oxide different from an oxide of the first oxide coating layer. A power inductor including an oxide coating layer is provided.

The magnetic metal powder may include at least one of iron (Fe) or carbonyl iron.

The average particle diameter of the metal magnetic powder may be 3 to 5 ㎛.

In one embodiment of the present invention, the first oxide coating layer may include silicon dioxide (SiO 2 ) and the second oxide coating layer may include titanium dioxide (TiO 2 ).

In another embodiment of the present invention, the first oxide coating layer may include titanium dioxide (TiO 2 ) and the second oxide coating layer may include silicon dioxide (SiO 2 ).

The thickness of the first oxide coating layer and the second oxide coating layer may be 20-30 nm.

In one embodiment of the present invention, the internal electrode may include at least one of silver (Ag), copper (Cu) and copper alloy.

According to the present invention, the surface of the metal magnetic powder included in the magnetic body of the power inductor may be double coated with different oxides to provide a power inductor having high saturation magnetization value and securing insulation and anti-oxidation characteristics. .

In addition, the power inductor to which the dual-coated metal magnetic powder of the present invention is applied has a small change in inductance value and can realize a maximum capacity.

1 is a perspective view showing a schematic structure of a power inductor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the AA 'cross-section of FIG. 1; FIG.
3A is a graph showing inductance characteristics with respect to the frequency of a power inductor including a magnetic body including an uncoated carbonyl iron powder.
3B illustrates inductance characteristics with respect to the frequency of a power inductor including a magnetic body formed of a magnetic body including carbonyl iron powder double coated with titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ) according to an embodiment of the present invention. It is a graph.
FIG. 4 is a graph showing DC-bias characteristics of a power inductor including a magnetic body including carbonyl iron powder double coated with titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ) according to an embodiment of the present invention. to be.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Therefore, the embodiments of the present invention will be clearly described based on the drawings, and the elements denoted by the same reference numerals in the drawings are the same elements.

1 is a perspective view showing a schematic structure of a power inductor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the AA 'cross-section of FIG. 1; FIG.

1 and 2, a power inductor 1 according to an embodiment of the present invention includes a magnetic body 10 including a double coated powder 12; Internal electrodes 11 formed in the magnetic body 10; And an external electrode 20 formed outside the magnetic body 10 and electrically connected to the internal electrode 11. And the double coated powder 12 is formed on the metal magnetic powder 12a, the first oxide coating layer 12b formed on the metal magnetic powder 12a, and the first oxide coating layer 12b. And a second oxide coating layer 12c formed of an oxide different from the oxide of the first oxide coating layer 12b.

The metal magnetic powder 12a may include, but is not limited to, at least one of iron (Fe) or carbonyl iron.

In addition, the average particle diameter of the metal magnetic powder 12a is not limited thereto, but the average particle diameter may be 3 to 5 μm. The smaller the average particle diameter of the metal magnetic powder 12a is, the larger the saturation magnetization value is, and thus the lower the inductance can be prevented. Therefore, when the average particle diameter of the metal magnetic powder 12a exceeds 5 μm, a sufficient saturation magnetization value may not be secured. When the average particle diameter of the metal magnetic powder 12a is less than 3 μm, the coating layer may not be easily formed. There is.

In one embodiment of the present invention, the first oxide coating layer 12b may include silicon dioxide (SiO 2 ) and the second oxide coating layer 12c may include titanium dioxide (TiO 2 ). In another embodiment of the present invention, the first oxide coating layer 12b may include titanium dioxide (TiO 2 ) and the second oxide coating layer 12c may include silicon dioxide (SiO 2 ). When the first and second oxide coating layers 12b and 12c are formed by using different oxides as described above, the thickness of each of the first and second oxide coating layers 12b and 12c may be easily adjusted and insulation may be secured.

If the same oxide is used for the first and second oxide coating layers 12b and 12c, the metal oxide powder 12a in which the first oxide coating layer 12b is not formed is the second oxide coating layer 12c in terms of bonding energy. The first oxide coating layer 12b is preferentially formed on the surface of the first oxide coating layer 12b, so that the effect of introducing the coating layer is not sufficiently secured, and the thickness of the coating layer is also unevenly formed. Therefore, by forming the first and second oxide coating layers 12b and 12c using different oxides, the surface of the metal magnetic powder 12a can be efficiently coated, thereby improving the anti-oxidation and insulation effects.

The first and second oxide coating layers 12b and 12c may be formed using a sol-gel method.

The thickness of the first oxide coating layer 12b and the second oxide coating layer 12c is not limited thereto, but is preferably 20-30 nm. If the thickness of the oxide coating layer is less than 20nm, it is difficult to form a uniform coating layer, and if it exceeds 30nm, the permeability and saturation magnetization value is greatly reduced.

According to an embodiment of the present invention, the magnetic body 10 may be formed by stacking a plurality of sheets made of a material including a double coated powder 12, glass and an organic binder.

However, the present invention is not limited thereto. For example, the magnetic body 10 may be formed by printing a paste made of a material including a double coated powder 12, a glass, and an organic binder to a predetermined thickness, or such a paste. Various methods may be applied as necessary, such as a method of pressing the mold into a mold.

In this case, the number of sheets laminated to form the magnetic body 10 or the thickness of the paste printed with a predetermined thickness may be determined to an appropriate number or thickness in consideration of electrical characteristics such as inductance required by the power inductor 1.

Each sheet forming the magnetic body 10 has an internal electrode 11 formed on one surface thereof, and a conductive via (not shown) penetrates the inner electrode 11 so as to contact the internal electrodes 11 positioned up and down in the thickness direction of the sheet. Can be.

Accordingly, one end of the internal electrode 11 formed in each sheet may be electrically connected to each other through conductive vias formed in the adjacent sheets.

In addition, both ends of the inner electrode 11 may be exposed to the outside through both ends of the magnetic body 10 so as to be electrically connected to each other while contacting the pair of outer electrodes 20 formed at both ends of the magnetic body 10. Can be.

The internal electrode 11 may be formed by, for example, thick film printing, coating, deposition, and sputtering, but the present invention is not limited thereto.

The conductive via may be formed by forming a through hole in each sheet in the thickness direction, and then filling the through hole with a conductive paste or the like, but the present invention is not limited thereto.

In addition, the material for forming the internal electrode 11 and the conductive paste for forming the conductive via may be made of a material including at least one of silver (Ag), copper (Cu), and a copper alloy, but is not limited thereto. no.

The external electrodes 20 are formed to cover the ends of the magnetic body 10 one by one, respectively, and contact the both ends of the internal electrodes 11 exposed through both ends of the magnetic body 10. Can be electrically connected.

The external electrode 20 may be formed on both ends of the magnetic body 10 through various methods such as immersing the magnetic body 10 in the conductive paste, or printing, deposition and sputtering.

 The conductive paste may be made of, for example, a material including one of silver (Ag), copper (Cu), and copper (Cu) alloy, but the present invention is not limited thereto.

In addition, a nickel (Ni) plating layer (not shown) and tin (Sn) plating layer (not shown) may be further formed on the outer surface of the external electrode 20 if necessary.

Table 1 below is a ferrite powder (Comparative Example 1), carbonyl iron powder (hereinafter Comparative Example 2) consisting of a quaternary system of nickel (Ni)-zinc (Zn)-copper (Cu)-iron (Fe) , Carbonyl iron powder coated with silicon dioxide (hereinafter Comparative Example 3), carbonyl iron powder coated with titanium dioxide (hereinafter Comparative Example 4) and carbonyl iron powder coated with silicon dioxide and titanium dioxide (hereinafter carried out) The experimental data for the saturation magnetization value and insulation of Example 1) are shown.

Saturation magnetization value (emu / g) Insulation Comparative Example 1 65 good Comparative Example 2 230 Poor Comparative Example 3 210 usually Comparative Example 4 185 usually Example 1 180-210 good

Referring to [Table 1], Comparative Example 1 is not appropriate because the change in inductance is large when used in a power inductor is small saturation magnetization value. In Comparative Examples 2, 3, 4 and Example 1, it can be seen that the high saturation magnetization value. The saturation magnetization value is highest in Comparative Example 2, which is an uncoated carbonyl iron powder, but since insulation is not secured, shorting occurs easily when used in the inductor body, and the saturation magnetization value decreases due to oxidation.

Table 2 below shows experimental data on the magnetic permeability and saturation magnetization value of the double-coated powder 12 according to the thickness of the first and second coating layers formed on the metal magnetic powder.

First oxide coating layer (nm) Second oxide coating layer (nm) Permeability (on 1 MHz) Saturation magnetization value (emu / g) 20 20 20 210 20 30 19.5 207 20 50 15 135 30 20 18 170 30 30 17 160 30 50 13 128 50 20 14.5 132 50 30 12 125 50 50 10 108

Referring to [Table 2], it can be seen that the permeability and saturation magnetization drops significantly when the thickness of each coating layer exceeds 30 nm. Therefore, it can be seen that the thickness of the appropriate coating layer is 20-30nm level.

Figure 3a is a graph showing the inductance characteristics with respect to the frequency of the power inductor to form a magnetic body including the uncoated carbonyl iron powder, Figure 3b is a bilayer layer of carbonyl iron powder to form a magnetic body This graph shows the inductance characteristics of the power inductor versus frequency.

In the case of applying the uncoated carbonyl iron powder as shown in Figure 3a, the insulation of the body is not secured, inductance does not appear in a certain frequency region and the short is easy to occur, as shown in Figure 3b as a double layer of the present invention When the coated carbonyl iron powder is applied, it can be seen that the insulation is ensured and the inductance according to the frequency appears normally.

In addition, Figure 4 is a graph showing the DC-bias characteristics of the inductor applying the carbonyl iron powder coated with a bi-layer of the present invention, it can be seen that the change in inductance according to the current is very small by using a material having a high saturation magnetization value. .

Therefore, the present invention provides a powder having a high saturation magnetization value and a stable insulation by double coating the metal magnetic powder, and by including it in the magnetic body of the power inductor, high reliability, small change in inductance value in DC-bias conditions A power inductor can be provided.

The present invention is not limited by the above-described embodiments and the accompanying drawings, but is intended to be limited only by the appended claims. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

1: power inductor
10: magnetic body
11: internal electrode
12: double coated powder
12a: Metal magnetic powder
12b: first oxide coating layer
12c: second oxide coating layer
20: external electrode

Claims (8)

A magnetic body comprising a double coated powder;
Internal electrodes formed in the magnetic body; And
An external electrode formed outside the magnetic body and electrically connected to the internal electrode; The double coated powder includes a metal magnetic powder, a first oxide coating layer formed on the metal magnetic powder, and a second oxide formed on the first oxide coating layer and made of an oxide different from an oxide of the first oxide coating layer. A power inductor comprising an oxide coating layer.
The method of claim 1,
The metal magnetic powder includes at least one of iron (Fe) and carbonyl iron.
The method of claim 1,
The first oxide coating layer comprises silicon dioxide (SiO 2 ) and the second oxide coating layer comprises titanium dioxide (TiO 2 ).
The method of claim 1,
The first oxide coating layer comprises titanium dioxide (TiO 2 ) and the second oxide coating layer comprises silicon dioxide (SiO 2 ).
The method of claim 1,
The power particle inductor, characterized in that the average particle diameter of the magnetic metal powder is 3 to 5 ㎛.
The method of claim 1,
The thickness of the first oxide coating layer is a power inductor, characterized in that 20-30nm.
The method of claim 1,
The thickness of the second oxide coating layer is a power inductor, characterized in that 20-30nm.
The method of claim 1,
The internal electrode includes at least one of silver (Ag), copper (Cu), and a copper alloy.
KR1020120082778A 2012-07-27 2012-07-27 Power inductor KR20140015074A (en)

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KR1020120082778A KR20140015074A (en) 2012-07-27 2012-07-27 Power inductor

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Application Number Priority Date Filing Date Title
KR1020120082778A KR20140015074A (en) 2012-07-27 2012-07-27 Power inductor

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KR20140015074A true KR20140015074A (en) 2014-02-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10580563B2 (en) 2015-10-27 2020-03-03 Samsung Electro-Mechanics Co., Ltd. Coil component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10580563B2 (en) 2015-10-27 2020-03-03 Samsung Electro-Mechanics Co., Ltd. Coil component

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