WO2012026121A1 - 過電圧保護部品および過電圧保護部品用の過電圧保護材料 - Google Patents
過電圧保護部品および過電圧保護部品用の過電圧保護材料 Download PDFInfo
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- WO2012026121A1 WO2012026121A1 PCT/JP2011/004717 JP2011004717W WO2012026121A1 WO 2012026121 A1 WO2012026121 A1 WO 2012026121A1 JP 2011004717 W JP2011004717 W JP 2011004717W WO 2012026121 A1 WO2012026121 A1 WO 2012026121A1
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- overvoltage protection
- discharge electrode
- overvoltage
- metal boride
- compound powder
- Prior art date
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/044—Physical layout, materials not provided for elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/06—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base
- H01C17/065—Apparatus or processes specially adapted for manufacturing resistors adapted for coating resistive material on a base by thick film techniques, e.g. serigraphy
- H01C17/06506—Precursor compositions therefor, e.g. pastes, inks, glass frits
- H01C17/06513—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component
- H01C17/06526—Precursor compositions therefor, e.g. pastes, inks, glass frits characterised by the resistive component composed of metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/1006—Thick film varistors
Definitions
- the present invention relates to an overvoltage protection component that protects an electronic component or an electronic circuit from an overvoltage such as static electricity, and an overvoltage protection material for the overvoltage protection component.
- the overvoltage protection component functions as an insulator in normal use, and when overvoltage is applied, the impedance of the component itself is greatly reduced or the component conducts electricity by discharging inside the component. It is.
- an overvoltage protection material which is normally insulative between a pair of electrodes and which allows the overvoltage to pass when an overvoltage is applied.
- Patent Document 1 a material in which metal particles having a passive layer formed on the surface are kneaded in a resin is known (see Patent Document 1).
- an overvoltage protection material a material using a material containing another conductor or semiconductor particle in which a conductor or semiconductor having a high aspect ratio is dispersed in a nano-scale in a bonded body is also known (see Patent Document 2). ).
- an overvoltage protection material a material in which a conductive inorganic material of 1 to 200 nm is discontinuously dispersed in an insulating material is also known (see Patent Document 3).
- test in which a short pulse of high voltage is applied continuously is a more severe test than the actual application of static electricity.
- a test method is also used.
- a short circuit may occur due to melting of metal particles or the like in the overvoltage protection part formed between the pair of discharge electrodes of the overvoltage protection component.
- the overvoltage protection component of the present invention includes a first discharge electrode, a second discharge electrode, and an overvoltage protection unit formed between the first discharge electrode and the second discharge electrode.
- the overvoltage protection unit normally has an insulating property in which a voltage equal to or lower than a predetermined voltage is applied between the first discharge electrode and the second discharge electrode, and the first discharge electrode, the second discharge electrode, In the state in which an overvoltage larger than a predetermined voltage is applied during this period, it has a property of conducting.
- the overvoltage protection part is comprised by the mixture of resin which has insulation, the inorganic compound which has insulation, and a boride metal compound powder.
- the average particle size of the metal boride compound powder is 0.5 ⁇ m to 3 ⁇ m.
- the metal boride compound powder which is the conductor powder in the overvoltage protection part, has a high melting point, the metal boride compound powder is difficult to melt even when an overvoltage is applied. Short circuit is unlikely to occur. Further, since it is considered that the metal boride compound powder is easily oxidized at a high temperature and loses its conductivity, even if an overvoltage is applied such that the metal boride compound powder melts, it is difficult to cause a short circuit.
- FIG. 1 is a front sectional view showing an example of an overvoltage protection component according to an embodiment of the present invention.
- FIG. 2 is a front cross-sectional view showing another example of the overvoltage protection component in the embodiment of the present invention.
- FIG. 1 is a front sectional view showing an example of an overvoltage protection component according to an embodiment of the present invention.
- the overvoltage protection component of the present embodiment includes an insulating substrate 1, a first discharge electrode 2, a second discharge electrode 3, an overvoltage protection unit 4, an intermediate layer 5, and protection.
- a layer 6, back electrodes 7 and 8, end electrodes 9 and 10, and plating layers 11 and 12 are provided.
- the insulating substrate 1 is a substrate having electrical insulation and heat resistance, and is made of alumina.
- the first discharge electrode 2 and the second discharge electrode 3 are electrodes formed on the insulating substrate 1 and are formed to face each other at their tip portions.
- the first discharge electrode 2 and the second discharge electrode 3 are conductors.
- the material of the first discharge electrode 2 and the second discharge electrode 3 is preferably gold if chemical stability is required, copper is preferable if high conductivity is required, and tungsten is required if heat resistance is required.
- the high melting point material can be selected.
- the first discharge electrode 2 and the second discharge electrode 3 are made of CuNi alloy.
- the manufacturing method of the first discharge electrode 2 and the second discharge electrode 3 is as follows. First, a paste of CuNi alloy is printed and fired between a position where the first discharge electrode 2 and the second discharge electrode 3 are formed and between the first discharge electrode 2 and the second discharge electrode 3. Thereafter, the first discharge electrode 2 and the second discharge electrode 3 are separated by irradiation with a laser beam. The first discharge electrode 2 and the second discharge electrode 3 are formed with a thickness of 5 ⁇ m to 10 ⁇ m. When the thickness of the first discharge electrode 2 and the second discharge electrode 3 is thin, damages of the first discharge electrode 2 and the second discharge electrode 3 are likely to be concentrated on one place by a severe repeated discharge test. In this case, the damaged first discharge electrode 2 or second discharge electrode 3 may be melted.
- the distance between the first discharge electrode 2 and the second discharge electrode 3 is set to 6 to 10 ⁇ m. This distance is called a so-called gap distance, and a shorter one can lower the discharge start voltage.
- the first discharge electrode 2 and the second discharge electrode 3 are formed by a thick film method such as printing. can do.
- the overvoltage protection unit 4 is formed so as to be filled between the first discharge electrode 2 and the second discharge electrode 3.
- the overvoltage protection unit 4 has an insulating property in a normal state where a voltage equal to or lower than a predetermined voltage is applied between the first discharge electrode 2 and the second discharge electrode 3. Further, the overvoltage protection unit 4 has a property of conducting when an overvoltage larger than a predetermined voltage is applied between the first discharge electrode 2 and the second discharge electrode 3.
- the predetermined voltage is a voltage determined by the material and composition of the overvoltage protection unit 4 or the distance between the first discharge electrode 2 and the second discharge electrode 3.
- the intermediate layer 5 is formed on the overvoltage protection unit 4 and is made of a resin such as silicone.
- the intermediate layer 5 mitigates an impact when an overvoltage is applied to the overvoltage protection unit 4.
- the protective layer 6 covers the overvoltage protection unit 4 and the intermediate layer 5, and protects the overvoltage protection unit 4 and the intermediate layer 5 from mechanical shock, moisture, and the like.
- the back electrode 7 and the back electrode 8 are electrodes formed on the surface facing the top surface of the insulating substrate 1 on which the first discharge electrode 2 and the second discharge electrode 3 are formed, that is, on the back surface of the insulating substrate 1.
- the end surface electrode 9 is connected to the first discharge electrode 2 and the back surface electrode 7 from the end on the upper surface side of the insulating substrate 1 through the side surface of the insulating substrate 1 to the end portion on the back surface side of the insulating substrate 1. It is an electrode formed up to.
- the end surface electrode 10 is connected to the second discharge electrode 3 and the back surface electrode 8 from the end on the top surface side of the insulating substrate 1 through the side surface of the insulating substrate 1 to the back surface side of the insulating substrate 1. It is the electrode formed to the edge part.
- the plating layer 11 is formed so as to cover the end face electrode 9 by performing Ni plating on the surface of the end face electrode 9 and then performing Sn plating.
- the plating layer 12 is formed so as to cover the end face electrode 10 by performing Ni plating on the surface of the end face electrode 10 and then performing Sn plating.
- the overvoltage protection unit 4 is an overvoltage protection material made of a mixture of an insulating resin, an insulating inorganic compound, and a metal boride compound powder.
- a silicone resin is used as this resin.
- the overvoltage protection unit 4 is obtained by dispersing a metal boride compound powder and an insulating inorganic compound in a silicone resin.
- oxides such as Al 2 O 3 and SiO 2 which are excellent in insulating properties and thermal conductivity are suitable. If higher thermal conductivity is required, non-oxides such as AlN, BN, SiC, and Si 3 N 4 may be used as the inorganic compound.
- the relationship between the average particle diameter of the metal boride compound powder and the overvoltage characteristics will be described.
- the characteristic it evaluated by the peak voltage which is one of the parameters
- the test conditions are the test methods defined in IEC 61000-4-2.
- overvoltage protection components having average particle diameters of 0.4 ⁇ m, 0.5 ⁇ m, 1.0 ⁇ m, 1.5 ⁇ m, 2.0 ⁇ m, 3.0 ⁇ m, and 5.0 ⁇ m were prepared.
- 8 kV is applied to each of these overvoltage protection components by contact discharge, and the suppression characteristics are insufficient when the peak voltage detected on the protection circuit side exceeds 500 V, and those with a peak voltage of 400 to 500 V are suppressed.
- Table 1 shows the test results.
- the metal boride compound powder used for the test was LaB 6 , and the average particle size was measured by the Fisher method (FSSS (Fisher Sub Sieve Sizer)).
- the average particle diameter of the metal boride compound powder is preferably 0.5 ⁇ m to 3.0 ⁇ m.
- the overvoltage suppression characteristics are very good.
- it is more preferable that the average particle diameter is 1 ⁇ m to 2 ⁇ m, since it is easy to form the metal boride compound powder into a powder and the overvoltage protection part 4 can be easily made by a printing method.
- the metal boride compound powder has the properties of a high melting point and high conductivity.
- the metal boride compound powder can be obtained by pulverizing the metal boride compound by a method such as a ball mill or a jet mill.
- the second discharge electrode 3 is electrically connected to the ground side on the input side of the electronic circuit where it is desired to protect the first discharge electrode 2 of the overvoltage protection component.
- the overvoltage protection unit 4 functions as an insulator, so that no current flows from the first discharge electrode 2 to the second discharge electrode 3, and an electric signal or the like flows to the input side of the electronic circuit.
- the content of the metal boride compound powder in the overvoltage protection material is preferably 10 vol% to 50 vol%.
- the content ratio of the metal boride compound powder in the overvoltage protection material is less than the above content ratio, even if an overvoltage is applied, the current caused by the overvoltage passes from the first discharge electrode 2 through the overvoltage protection section 4. This makes it difficult to flow to the second discharge electrode 3.
- the content of the metal boride compound powder in the overvoltage protection material is higher than the above content, current easily flows through the overvoltage protection portion even during normal time when no overvoltage is applied, and the insulation resistance is likely to deteriorate.
- the mixing ratio of the mixture in the overvoltage protection unit 4 of the present embodiment is as follows: 20% by volume of LaB 6 as a metal boride compound powder, 40% by volume of Al 2 O 3 as an inorganic compound having an insulating property, and 40% of silicone resin as an insulating resin. %.
- the overvoltage protection unit 4 is obtained by dispersing metal boride compound powder in a silicone resin that is an insulator. Since the metal boride compound powder is a conductor, when an overvoltage is applied between the first discharge electrode 2 and the second discharge electrode 3, the first discharge electrode 2 and the second discharge are passed through the metal boride compound powder. Discharge occurs between the electrodes 3. As a result, a current due to the overvoltage flows from the first discharge electrode 2 to the second discharge electrode 3.
- the conductor powder in the overvoltage protection unit 4 is also heated. Possible damage.
- the high melting point metal boride compound powder is used as the conductor powder of the overvoltage protection unit 4, it is possible to reduce the risk that the conductor powder melts due to heat during discharge. Thereby, the discharge current which flows from the 1st discharge electrode 2 to the 2nd discharge electrode 3 can be reduced, and the generation
- TiB 2 titanium diboride
- the reliability can be further improved.
- TiB 2 has a high melting point of about 3000 ° C. and is chemically stable and hardly oxidized at room temperature, but has a remarkable characteristic that conductivity is impaired by oxidation at high temperature. Therefore, if the TiB 2 is hot enough to melt, TiB 2 oxidizes, it loses conductivity. For this reason, even if the TiB 2 powder in the overvoltage protection unit 4 melts and comes into contact with the adjacent TiB 2 powder, the melted TiB 2 powder is oxidized to produce TiO 2 and B 2 O 3 . Thereby, since it is thought that the overvoltage protection part 4 is insulated, it becomes difficult to produce a short circuit.
- metal boride compound powder it may be used ZrB 2 which is a compound of Zr is the same titanium group as Ti. Since ZrB 2 has a higher melting point than TiB 2 , the occurrence of a short circuit can be more effectively prevented. Further, a mixed powder of TiB 2 powder and ZrB 2 powder may be used as the metal boride compound powder.
- the metal boride compound powder it may be used LaB 6.
- the number of boron per metal atom is larger than that of TiB 2, and more insulating B 2 O 3 is generated when oxidized, so that the occurrence of a short circuit can be further suppressed.
- TiB 2, ZrB 2 may contain at least one kind of LaB 6.
- the overvoltage protection component of the present invention is difficult to melt the metal boride compound powder, which is a conductor in the overvoltage protection unit 4, even in severe repeated tests. Since it becomes an insulator by being oxidized in the case, short-circuiting hardly occurs.
- the overvoltage protection material that is the material of the overvoltage protection unit 4 is useful as it can be used as an overvoltage protection component as described above, thereby preventing the occurrence of a short circuit in the overvoltage protection component.
- test results are shown in Table 2.
- the average particle size of the metal boride compound or Al powder used in this test is 1 to 2 ⁇ m in any overvoltage protection element.
- the heat capacity is also small if the average particle diameter of the metal boride compound powder is too small, it tends to become high temperature due to high energy during discharge. Since the metal boride compound powder becomes an insulator by being oxidized at a high temperature, static electricity cannot pass again. As a result, the electric charge due to overvoltage takes a path that passes through other metal boride compound powders, but the metal boride compound powder is also likely to be oxidized at high temperatures, so this path can also pass thereafter. Disappear. By repeating this, the overvoltage discharge path becomes a detour and the discharge characteristics may change.
- an insulating oxide film is formed on the surface of the metal boride compound powder, but if the average particle size of the metal boride compound powder is small, the metal boride compound powder itself is affected by the effect of the oxide film formed on the surface. The electrical resistance value increases. For this reason, the static electricity suppression characteristic of the overvoltage protection unit 4 is deteriorated, in other words, the peak voltage value is increased.
- the average particle diameter of the metal boride compound powder is increased, the number of metal boride compound powders passing when discharging between the first discharge electrode 2 and the second discharge electrode 3 is decreased. For this reason, if the volume ratio occupied by the metal boride compound powder in the overvoltage protection unit 4 is made constant, the distance between the metal boride compound powders becomes long, and the static electricity suppression characteristics are deteriorated.
- FIG. 2 is a front cross-sectional view showing another example of the overvoltage protection component in the present embodiment.
- the constituent elements shown in FIG. 2 the constituent elements having the same functions as those shown in FIG.
- the overvoltage protection component of FIG. 2 is different from the overvoltage protection component of FIG. 1 in that the first discharge electrode 2 and the second discharge electrode 3 are not opposed to each other at their respective tip portions, but in the respective plane directions. 2 are opposed to each other, and the intermediate layer 5 is not present in the overvoltage protection component of FIG.
- the overvoltage protection unit uses a mixture of an insulating resin, an insulating inorganic compound, and a metal boride compound powder, but borated in an insulating ceramic or glass. What used the thing in which the metal compound powder was disperse
- the overvoltage protection component and overvoltage protection material for an overvoltage protection component according to the present invention can protect electronic components and electronic circuits from overvoltage such as static electricity, and are industrially useful.
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Abstract
Description
2 第1の放電電極
3 第2の放電電極
4 過電圧保護部
5 中間層
6 保護層
7,8 裏面電極
9,10 端面電極
11,12 めっき層
Claims (5)
- 第1の放電電極と、
第2の放電電極と、
前記第1の放電電極と前記第2の放電電極との間に形成された過電圧保護部とを備え、
前記過電圧保護部は前記第1の放電電極と前記第2の放電電極との間に所定電圧以下の電圧が印加される通常状態では絶縁体の性質を有し、前記第1の放電電極と前記第2の放電電極との間に前記所定電圧より大きな過電圧が印加される状態では導通する性質を有するものであり、
前記過電圧保護部は絶縁性を有する樹脂と絶縁性を有する無機化合物とホウ化金属化合物粉との混合物により構成され、
前記ホウ化金属化合物粉の平均粒径は0.5μm~3μmである過電圧保護部品。 - 前記ホウ化金属化合物粉はTiB2、ZrB2、LaB6の少なくとも一種類を含有する請求項1記載の過電圧保護部品。
- 前記第1の放電電極と前記第2の放電電極は、ともにCuNi合金からなり、その厚みは5μm~10μmである請求項2記載の過電圧保護部品。
- 絶縁性を有する樹脂と、絶縁性を有する無機化合物と、平均粒径が0.5μm~3μmであるホウ化金属化合物粉との混合物であり、所定電圧以下の電圧が印加される通常状態では絶縁性を有し、前記所定電圧より大きな過電圧が印加される状態では導通する性質を有する過電圧保護部品用の過電圧保護材料。
- 前記ホウ化金属化合物粉は、TiB2、ZrB2、LaB6の少なくとも一種類を含有する請求項4記載の過電圧保護部品用の過電圧保護材料。
Priority Applications (3)
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JP2012530537A JP5877317B2 (ja) | 2010-08-26 | 2011-08-25 | 過電圧保護部品および過電圧保護部品用の過電圧保護材料 |
US13/704,430 US9001485B2 (en) | 2010-08-26 | 2011-08-25 | Overvoltage protection component, and overvoltage protection material for overvoltage protection component |
CN2011800413687A CN103081262A (zh) | 2010-08-26 | 2011-08-25 | 过电压保护部件及过电压保护部件用的过电压保护材料 |
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JP2011025735 | 2011-02-09 |
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US (1) | US9001485B2 (ja) |
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WO (1) | WO2012026121A1 (ja) |
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US20140321009A1 (en) * | 2013-04-26 | 2014-10-30 | Samsung Electro-Mechanics Co., Ltd. | Esd protection material and esd protection device using the same |
JP2019506741A (ja) * | 2016-01-11 | 2019-03-07 | ティーディーケイ・エレクトロニクス・アクチェンゲゼルシャフトTdk Electronics Ag | Esd保護機能を有するデバイス担体とその製造のための方法 |
CN113612211A (zh) * | 2021-07-22 | 2021-11-05 | 西安交通大学 | 一种基于铜铬合金的高可焊性可控多层间隙过电压保护器 |
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US10118712B2 (en) * | 2011-08-17 | 2018-11-06 | The Boeing Company | Electrical conductor pathway system and method of making the same |
KR20140128667A (ko) * | 2013-04-29 | 2014-11-06 | 삼성전기주식회사 | 정전 방전 보호 소자 및 그 제조 방법, 그리고 상기 정전 방전 보호 소자를 구비하는 칩 부품 |
US9099861B2 (en) * | 2013-05-23 | 2015-08-04 | Inpaq Technology Co., Ltd. | Over-voltage protection device and method for preparing the same |
CN103805988B (zh) * | 2013-12-16 | 2016-02-10 | 湖北工业大学 | 电火花熔覆涂层用的TiB2-ZrB2复相熔覆棒及其制备方法 |
US11393635B2 (en) | 2018-11-19 | 2022-07-19 | Kemet Electronics Corporation | Ceramic overvoltage protection device having low capacitance and improved durability |
US11178800B2 (en) | 2018-11-19 | 2021-11-16 | Kemet Electronics Corporation | Ceramic overvoltage protection device having low capacitance and improved durability |
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JP2010165660A (ja) * | 2008-07-24 | 2010-07-29 | Tdk Corp | 静電気対策素子 |
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US20140321009A1 (en) * | 2013-04-26 | 2014-10-30 | Samsung Electro-Mechanics Co., Ltd. | Esd protection material and esd protection device using the same |
JP2019506741A (ja) * | 2016-01-11 | 2019-03-07 | ティーディーケイ・エレクトロニクス・アクチェンゲゼルシャフトTdk Electronics Ag | Esd保護機能を有するデバイス担体とその製造のための方法 |
CN113612211A (zh) * | 2021-07-22 | 2021-11-05 | 西安交通大学 | 一种基于铜铬合金的高可焊性可控多层间隙过电压保护器 |
CN113612211B (zh) * | 2021-07-22 | 2022-10-25 | 西安交通大学 | 一种基于铜铬合金的高可焊性可控多层间隙过电压保护器 |
Also Published As
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CN103081262A (zh) | 2013-05-01 |
US20130083440A1 (en) | 2013-04-04 |
US9001485B2 (en) | 2015-04-07 |
JPWO2012026121A1 (ja) | 2013-10-28 |
JP5877317B2 (ja) | 2016-03-08 |
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