JP7404426B2 - Current detection resistor and method for manufacturing current detection resistor - Google Patents
Current detection resistor and method for manufacturing current detection resistor Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims description 40
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 25
- 239000011733 molybdenum Substances 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 23
- 239000011651 chromium Substances 0.000 claims description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 20
- 229910052750 molybdenum Inorganic materials 0.000 claims description 16
- 238000007747 plating Methods 0.000 claims description 16
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 15
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 11
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 10
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 239000000919 ceramic Substances 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- UTICYDQJEHVLJZ-UHFFFAOYSA-N copper manganese nickel Chemical compound [Mn].[Ni].[Cu] UTICYDQJEHVLJZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- MOWMLACGTDMJRV-UHFFFAOYSA-N nickel tungsten Chemical compound [Ni].[W] MOWMLACGTDMJRV-UHFFFAOYSA-N 0.000 description 2
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007545 Vickers hardness test Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- OGSYQYXYGXIQFH-UHFFFAOYSA-N chromium molybdenum nickel Chemical compound [Cr].[Ni].[Mo] OGSYQYXYGXIQFH-UHFFFAOYSA-N 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/01—Mounting; Supporting
- H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/08—Cooling, heating or ventilating arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/08—Cooling, heating or ventilating arrangements
- H01C1/084—Cooling, heating or ventilating arrangements using self-cooling, e.g. fins, heat sinks
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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
- H01C7/06—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 including means to minimise changes in resistance with changes in temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/28—Apparatus or processes specially adapted for manufacturing resistors adapted for applying terminals
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Apparatuses And Processes For Manufacturing Resistors (AREA)
- Details Of Resistors (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Interface Circuits In Exchanges (AREA)
- Non-Adjustable Resistors (AREA)
Description
本発明は、電流検出用抵抗器及び電流検出用抵抗器の製造方法に関する。 The present invention relates to a current detection resistor and a method for manufacturing a current detection resistor.
回路基板上にはんだを介して実装される電流検出用抵抗器として、所定の抵抗値を有しており金属板により形成された本体部と、本体部の両側端部に連設されており本体部を回路基板上にはんだ付けするはんだ付け部とを有する抵抗器が開示されている(特許文献1参照)。 As a current detection resistor mounted on a circuit board via solder, it has a main body part formed of a metal plate and has a predetermined resistance value, and a main body part connected to both ends of the main body part. A resistor having a soldering part for soldering the part onto a circuit board is disclosed (see Patent Document 1).
特許文献1に記載された抵抗器では、本体部のための金属材料として、銅ニッケル系、ニッケルクロム系、銅マンガンニッケル系などの抵抗体材料が用いられる。しかし、抵抗体材料として汎用の銅マンガンニッケル系抵抗体材料は、成分中のマンガン(Mn)が高温で酸化しやすく、酸化の進行に伴って抵抗値の変化が大きくなってしまう。
In the resistor described in
このため、銅マンガンニッケル系抵抗体材料では、170~180℃程度の温度が、抵抗値の変動を許容範囲に収められる上限温度として設定されている。 For this reason, in copper manganese nickel based resistor materials, a temperature of about 170 to 180° C. is set as the upper limit temperature at which fluctuations in resistance can be kept within an allowable range.
一方、近年、電気自動車の普及や電子機器の高機能化に伴って、電子部品を実装する回路基板に対する高電力化及び高耐熱性への要求が高まっている。特に、ワイドギャップパワー半導体と呼ばれるSiCやGaNなどのように、高温で動作する半導体素子の開発が進められている。 On the other hand, in recent years, with the spread of electric vehicles and the increasing functionality of electronic devices, there has been an increasing demand for higher power and higher heat resistance for circuit boards on which electronic components are mounted. In particular, the development of semiconductor elements that operate at high temperatures, such as SiC and GaN, which are called wide-gap power semiconductors, is progressing.
これに伴い、回路基板に実装される電流検出用抵抗器に対しても、上記温度を上回る温度、例えば、200℃以上の温度領域でも使用可能なスペックが要求されている。 Accordingly, current detection resistors mounted on circuit boards are also required to have specifications that allow them to be used at temperatures higher than the above temperature, for example, in a temperature range of 200° C. or higher.
本発明は、高い温度領域において、抵抗値の変化が大きくなるのを抑制する電流検出用抵抗器及び当該電流検出用抵抗器が実装された回路基板を提供することを目的とする。 An object of the present invention is to provide a current detection resistor that suppresses a large change in resistance value in a high temperature region, and a circuit board on which the current detection resistor is mounted.
本発明者らは、鋭意研究を重ねた結果、ニッケルとクロムとモリブデンとの合金が高耐熱性を有することに着目し、本発明を完成するに至った。 As a result of extensive research, the present inventors have focused on the fact that an alloy of nickel, chromium, and molybdenum has high heat resistance, and have completed the present invention.
本発明の一態様としての電流検出用抵抗器は、抵抗体材料の板体から形成され、前記抵抗体材料は、ニッケルとクロムとモリブデンとの合金を含み、前記合金の全質量比で前記ニッケルを63質量%以上70質量%以下、前記クロムを8質量%以上22質量%以下、前記モリブデンを8質量%以上25質量%以下、含有し、200℃にて1000時間経過後の抵抗値の変化率が±0.50%の範囲内である。 A current detection resistor as an aspect of the present invention is formed from a plate of a resistor material, and the resistor material includes an alloy of nickel, chromium, and molybdenum, and the total mass ratio of the alloy is Contains 63% by mass or more and 70% by mass or less of chromium, 8% by mass or more and 22% by mass or less of the molybdenum, and changes in resistance after 1000 hours at 200°C. The ratio is within ±0.50%.
この態様によれば、高耐熱性を有するニッケルとクロムとモリブデンとの合金を抵抗体材料として用いたことにより、高い温度領域において、抵抗値の変化が大きくなるのを抑制することができる。 According to this aspect, by using an alloy of nickel, chromium, and molybdenum that has high heat resistance as the resistor material, it is possible to suppress a change in resistance value from increasing in a high temperature range.
[電流検出用抵抗器の説明]
本発明の実施形態に係る電流検出用抵抗器について、図1~図4を用いて詳細に説明する。
[Description of current detection resistor]
A current detection resistor according to an embodiment of the present invention will be explained in detail using FIGS. 1 to 4.
<電流検出用抵抗器の構造>
図1は、本実施形態に係る電流検出用抵抗器の一例を説明する平面図である。また、図2は、図1に示す電流検出用抵抗器の側面図である。
<Structure of current detection resistor>
FIG. 1 is a plan view illustrating an example of a current detection resistor according to this embodiment. Moreover, FIG. 2 is a side view of the current detection resistor shown in FIG. 1.
電流検出用抵抗器1は、ニッケル(Ni)とクロム(Cr)とモリブデン(Mo)の合金を含む抵抗体材料から形成された板状のシャント抵抗器である。
The
電流検出用抵抗器1は、本体部11と、第一接続部12と、第二接続部13と、第一起立部14と、第二起立部15とを有する。
The
本体部11は、矩形状であり、回路基板の実装面から所定間隔離間して配置される。
The
第一接続部12の一方の端部は、実装面に接続される。また、第一接続部12の他方の端部は、第一起立部14を介して本体部11に連結されている。第二接続部13の一方の端部は、実装面に接続される。また、第二接続部13の他方の端部は、第二起立部15を介して本体部11に連結されている。第一起立部14及び第二起立部15は、本体部11を実装面から離間させるように、本体部11の端部と第一接続部12及び第二接続部13とを連結する。
One end of the first connecting
本実施形態においては、第一接続部12及び第二接続部13は、図2に示すように、実装面に対向する面に形成された実装面用めっき層16と、実装面に対向する面の反対面に形成されたボンディング用めっき層17と、実装面用めっき層16とボンディング用めっき層17とに連なって形成された端面電極18とを有する。なお、端面電極18は無くてもよい。
In this embodiment, as shown in FIG. 2, the
電流検出用抵抗器1は、抵抗体材料から形成された板体をプレス加工により形成することができる。
The
<抵抗体材料>
本実施形態において、電流検出用抵抗器1を形成する抵抗体材料は、ニッケルとクロムとモリブデンとの合金を含み、この合金の全質量比で、ニッケルを63質量%以上70質量%以下、クロムを8質量%以上22質量%以下、モリブデンを8質量%以上25質量%以下、含有するものである。
<Resistor material>
In this embodiment, the resistor material forming the
抵抗体の耐熱性を向上させる観点から、モリブデンの含有量は多い方がよい。しかし、モリブデンは硬度が高く脆弱であるため、モリブデンの含有量が過多になると、抵抗体材料の加工性が低下する。このため、モリブデンの含有量は、8質量%以上25質量%以下に設定する。 From the viewpoint of improving the heat resistance of the resistor, the molybdenum content should be higher. However, since molybdenum has high hardness and is brittle, when the content of molybdenum becomes excessive, the workability of the resistor material decreases. Therefore, the molybdenum content is set to 8% by mass or more and 25% by mass or less.
さらに、抵抗体材料は、タングステン(W)及びマンガン(Mn)の少なくとも一方をこの合金の全質量比で6質量%以下含有してもよい。抵抗体材料がタングステン及びマンガンの少なくとも一方をこの合金の全質量比で6質量%以下含有することにより、抵抗体材料におけるモリブデンの含有量を増加させることなく耐熱性を確保することができる。 Furthermore, the resistor material may contain 6% by mass or less of at least one of tungsten (W) and manganese (Mn) based on the total mass ratio of the alloy. When the resistor material contains at least one of tungsten and manganese in an amount of 6% by mass or less based on the total mass ratio of the alloy, heat resistance can be ensured without increasing the content of molybdenum in the resistor material.
上記抵抗体材料として市販品を使用する場合には、クロムを22質量%、モリブデンを8質量%、ニッケルを70質量%含有するDSALOY625(大同特殊鋼株式会社製)、クロムを21質量%、モリブデンを13質量%、タングステンを3質量%、ニッケルを63質量%含有するDSALOY22(大同特殊鋼株式会社製)、クロムを8質量%、モリブデンを25質量%、ニッケルを67質量%含有するDSALOY242(大同特殊鋼株式会社製)を好適に使用することができる。 When using a commercially available product as the above resistor material, DSALOY625 (manufactured by Daido Steel Co., Ltd.) containing 22% by mass of chromium, 8% by mass of molybdenum, and 70% by mass of nickel; DSALOY22 (manufactured by Daido Steel Co., Ltd.) containing 13% by mass of chromium, 3% by mass of tungsten, and 63% by mass of nickel; (manufactured by Tokushu Steel Co., Ltd.) can be suitably used.
これらのなかでも特に、クロムを8質量%、モリブデンを25質量%、ニッケルを67質量%含有するDSALOY242は、抵抗値の変化が小さく、抵抗温度係数(TCR)が低いことから、好適に用いられる。 Among these, DSALOY242, which contains 8% by mass of chromium, 25% by mass of molybdenum, and 67% by mass of nickel, is preferably used because of its small change in resistance value and low temperature coefficient of resistance (TCR). .
[電流検出用抵抗器の製造方法]
図3は、本実施形態に係る電流検出用抵抗器の製造方法を説明する図である。電流検出用抵抗器の製造方法は、ニッケルとクロムとモリブデンとの合金を含み、当該合金の全質量比でニッケルを63質量%以上70質量%以下、クロムを8質量%以上22質量%以下、モリブデンを8質量%以上25質量%以下含有する抵抗体材料を、所定形状になるようにプレス加工を行うというものである。
[Method of manufacturing current detection resistor]
FIG. 3 is a diagram illustrating a method of manufacturing a current detection resistor according to this embodiment. The method for manufacturing a current detection resistor includes an alloy of nickel, chromium, and molybdenum, and the total mass ratio of the alloy is 63% to 70% by mass of nickel, 8% to 22% by mass of chromium, A resistor material containing 8% by mass or more and 25% by mass or less of molybdenum is pressed into a predetermined shape.
上述した抵抗体材料は、200℃以上に加熱されると、温度が上昇している間の所定期間に亘って抵抗値の変化が大きくなり、所定期間が経過した後は、抵抗体材料の抵抗値が特定のところで収束するという挙動を有する。この抵抗体材料では、抵抗値の変化が特定のところで収束した状態における抵抗体材料のビッカース硬さが200HV以上240HV以下となっている。 When the above-mentioned resistor material is heated to 200°C or higher, the resistance value changes greatly over a predetermined period while the temperature is rising, and after the predetermined period has elapsed, the resistance of the resistor material decreases. It has the behavior that the value converges at a specific point. In this resistor material, the Vickers hardness of the resistor material is 200 HV or more and 240 HV or less when the change in resistance value converges at a specific point.
そこで、本製造方法では、プレス加工して得られた抵抗体に、ビッカース硬さが200HV以上240HV以下になるような処理を行うことにより、抵抗値の変動が小さい抵抗体材料を製造することができる。 Therefore, in this manufacturing method, the resistance element obtained by press processing is treated to have a Vickers hardness of 200 HV or more and 240 HV or less, thereby making it possible to manufacture a resistor material with small fluctuations in resistance value. can.
具体的には、図3に示すように、上述したニッケルとクロムとモリブデンとの合金を所定形状へのプレス加工前に、抵抗体材料のビッカース硬さが220HV以上290HV以下になるように、第一の処理を行っておく。続いて、抵抗体材料をプレス加工し、さらに、プレス加工により得られた抵抗体のビッカース硬さが15%~25%減少するような第二の処理を行う。 Specifically, as shown in FIG. 3, before pressing the above-mentioned alloy of nickel, chromium, and molybdenum into a predetermined shape, the resistor material is subjected to a first process so that the Vickers hardness of the resistor material is 220 HV or more and 290 HV or less. Perform the first process. Subsequently, the resistor material is pressed, and a second treatment is performed to reduce the Vickers hardness of the resistor obtained by pressing by 15% to 25%.
第二の処理としては、プレス加工後の抵抗体を、175℃以上で200時間以上曝す加熱処理を用いることができる。一例として、200℃以上に250時間曝す処理を行うことが好ましい。これにより、ビッカース硬さが200HV以上240HV以下の抵抗体を得ることができる。 As the second treatment, heat treatment can be used in which the resistor after press working is exposed to a temperature of 175° C. or higher for 200 hours or more. As an example, it is preferable to perform a treatment of exposing to 200° C. or higher for 250 hours. Thereby, a resistor having a Vickers hardness of 200 HV or more and 240 HV or less can be obtained.
このように、ビッカース硬さが200HV以上240HV以下になるように、抵抗体材料に事前の処理を施すことより、抵抗値の変化が大きくなるのを抑制する効果を高めることができる。 In this way, by pre-treating the resistor material so that the Vickers hardness is 200 HV or more and 240 HV or less, it is possible to enhance the effect of suppressing a large change in resistance value.
[回路基板]
図4は、本発明の実施形態に係る電流検出用抵抗器が実装された回路基板を説明する図である。
[Circuit board]
FIG. 4 is a diagram illustrating a circuit board on which a current detection resistor according to an embodiment of the present invention is mounted.
本実施形態に係る回路基板100は、絶縁基板110と、絶縁基板110に形成された回路パターン120とを有し、上述した電流検出用抵抗器1は、第一接続部12及び第二接続部13において、回路パターン120に、ワイヤーボンディング130やはんだ実装による電極140によって接続された回路基板である。
The
本実施形態において、絶縁基板110としては、ガラスエポキシ基板、メタル基板、セラミックス基板を用いることができる。なかでも、高耐熱性の観点からセラミックス基板を用いることが好ましい。本実施形態においては、セラミックス基板として、酸化アルミニウム、窒化ケイ素及び窒化アルミニウムからなる群から選択される少なくとも1つの材料を用いることができる。
In this embodiment, a glass epoxy substrate, a metal substrate, or a ceramic substrate can be used as the
セラミックス基板の厚みは、0.1mm以上1.0mm以下のものを用いることができる。基板の強度の観点から、セラミックス基板の厚みは、0.1mm以上であることが好ましい。また、放熱性の観点から、1.0mm以下であることが好ましい。 The thickness of the ceramic substrate can be 0.1 mm or more and 1.0 mm or less. From the viewpoint of the strength of the substrate, the thickness of the ceramic substrate is preferably 0.1 mm or more. Further, from the viewpoint of heat dissipation, the thickness is preferably 1.0 mm or less.
回路パターン120と電流検出用抵抗器1とを接続するための電極として、一般的に電極として用いられる銅(Cu)は、耐熱性が低く酸化されやすい。このため、本実施形態では、耐熱性を向上させるために、ニッケル系めっき及び金系めっきを用いるができる。これらのなかでも、ニッケル-タングステンめっき、ニッケル-リンめっき、ニッケル-タングステン/金めっき、ニッケル-リン/金めっき、ニッケル/金めっき等を用いることが好ましい。
Copper (Cu), which is generally used as an electrode for connecting the
[その他の実施形態]
以上、本発明の実施形態について説明したが、上記実施形態は、本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。例えば、本実施形態に係る電流検出用抵抗器1の形状は、図1に説明されたものに限定されない。
[Other embodiments]
Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and the purpose is to limit the technical scope of the present invention to the specific configuration of the above embodiments. isn't it. For example, the shape of the
本発明の実施形態に係る電流検出用抵抗器を作製し、耐熱性及び抵抗特性の評価を行った。供試体の作製方法及び評価方法は、以下のとおりである。 A current detection resistor according to an embodiment of the present invention was manufactured, and its heat resistance and resistance characteristics were evaluated. The preparation method and evaluation method of the specimen are as follows.
[供試体の作製]
<実施例1>
ニッケル-クロム-モリブデン合金(以下、Ni-Cr-Mo合金と記す)として、クロムを22質量%、モリブデンを8質量%、ニッケルを70質量%含有するDSALOY625(大同特殊鋼株式会社製、22Cr-8Mo-70Niと記す)を用い、これを板状に加工した後、図1及び図2に示す抵抗器を作製した。各部の寸法は、以下のとおりである。
[Preparation of specimen]
<Example 1>
As a nickel-chromium-molybdenum alloy (hereinafter referred to as Ni-Cr-Mo alloy), DSALOY625 (manufactured by Daido Steel Co., Ltd., 22Cr- 8Mo-70Ni) was processed into a plate shape, and then the resistor shown in FIGS. 1 and 2 was fabricated. The dimensions of each part are as follows.
Ld=5.0mm
Lc=3,2mm
d=0.2mm
Ld=5.0mm
Lc=3.2mm
d=0.2mm
<実施例2>
Ni-Cr-Mo合金として、クロムを21質量%、モリブデンを15質量%、タングステンを3質量%、ニッケルを63質量%含有するDSALOY22(大同特殊鋼株式会社製、21Cr-13Mo-3W-63Niと記す)を用いたこと以外は、実施例1と同様にして供試体を作製した。
<Example 2>
As a Ni-Cr-Mo alloy, DSALOY22 (manufactured by Daido Steel Co., Ltd., 21Cr-13Mo-3W-63Ni and A specimen was prepared in the same manner as in Example 1, except that the following materials were used.
<実施例3>
Ni-Cr-Mo合金として、クロムを8質量%、モリブデンを25質量%、ニッケルを67質量%含有するDSALOY242(大同特殊鋼株式会社製、8Cr-25Mo-67Niと記す)を用いたこと以外は、実施例1と同様にして供試体を作製した。
<Example 3>
Except for using DSALOY242 (manufactured by Daido Steel Co., Ltd., written as 8Cr-25Mo-67Ni) containing 8% by mass of chromium, 25% by mass of molybdenum, and 67% by mass of nickel as the Ni-Cr-Mo alloy. A specimen was prepared in the same manner as in Example 1.
<比較例>
Ni-Cr-Mo合金の代わりに、銅マンガンニッケル系抵抗体材料を用いたこと以外は、実施例1と同様にして供試体を作製した。
<Comparative example>
A specimen was produced in the same manner as in Example 1 except that a copper manganese nickel based resistor material was used instead of the Ni--Cr--Mo alloy.
[測定方法]
<体積抵抗率>
試料の本体部11の幅と厚みは一定であるため、本体部11の断面積は、本体部11の長手方向に沿って一様に断面積S(cm2)となっている。このため、抵抗体材料の体積抵抗率ρは、第一接続部12と第二接続部13の間の電圧Vと、電流Iと、断面積S(cm2)と、第一接続部12と第二接続部13の間の長さLd(cm)とから、以下の式により算出される。
ρ=(V/I)×(S/Ld) [10-6Ω・cm]
本測定では、体積抵抗率ρの許容範囲は、120~150[10-6Ω・cm]とされる。
[Measuring method]
<Volume resistivity>
Since the width and thickness of the
ρ=(V/I)×(S/Ld) [ 10-6 Ω・cm]
In this measurement, the allowable range of volume resistivity ρ is 120 to 150 [10 −6 Ω·cm].
<抵抗温度係数(TCR)の測定>
抵抗温度係数(TCR)とは、抵抗体の温度変化による内部抵抗値の変化の割合を表すものであり、以下の式により算出される。
抵抗温度係数(ppm/℃)=(R-Ra)/Ra÷(T-Ta)×1000000
ここで、Ra:基準温度における抵抗値、Ta:基準温度、R:定常状態における抵抗値、T:定常状態になる温度である。
本実施例では、Ta=25℃、T=100℃である。なお、製品スペックに基づいて、TCRの許容範囲を±100ppm/℃に設定した。測定結果は、第1表に示される。
<Measurement of temperature coefficient of resistance (TCR)>
The temperature coefficient of resistance (TCR) represents the rate of change in internal resistance value due to temperature change of a resistor, and is calculated by the following formula.
Temperature coefficient of resistance (ppm/℃) = (R-Ra)/Ra÷(T-Ta)×1000000
Here, Ra: resistance value at reference temperature, Ta: reference temperature, R: resistance value in steady state, T: temperature at which the steady state is reached.
In this example, Ta=25°C and T=100°C. In addition, based on the product specifications, the allowable range of TCR was set to ±100 ppm/°C. The measurement results are shown in Table 1.
<耐熱性試験:抵抗体の抵抗値の変化率>
実施例1~3及び比較例の供試体について、200℃に加熱し、200℃を所定時間保持する熱放置試験を行って、放置時間の違いによる抵抗値の変化を測定した。
抵抗値の変化率は、以下の式により算出される。
<Heat resistance test: Rate of change in resistance value of resistor>
The specimens of Examples 1 to 3 and Comparative Example were subjected to a heat-standing test in which they were heated to 200°C and maintained at 200°C for a predetermined period of time, and changes in resistance values due to differences in standing time were measured.
The rate of change in resistance value is calculated by the following formula.
抵抗値変化率(%)={(Rh-Ra)/Ra}×100
ここで、Raは、熱放置試験前における抵抗値であり、Rhは、熱放置試験において所定時間経過後の抵抗値である。結果は、第1表に示される。
本測定では、1000時間に至っても抵抗値の変化率が±0.50%の範囲に納まるものを許容する。
Resistance value change rate (%) = {(Rh-Ra)/Ra}×100
Here, Ra is the resistance value before the heat exposure test, and Rh is the resistance value after a predetermined time has elapsed in the heat exposure test. The results are shown in Table 1.
In this measurement, the rate of change in resistance value is allowed to be within the range of ±0.50% even after 1000 hours.
<ビッカース硬さ>
ビッカース硬さは日本工業規格JIS Z2244:2009(ビッカース硬さ試験‐試験方法)に従って測定することができる。ビッカース硬さの測定には、硬度計(例えばマイクロビッカース硬度計HMV-G21:島津製作所)が使用される。ビッカース硬さは、例えば試験温度25℃、試験力100gf、ダイヤモンド圧子の接近速度20μm/s、および試験力の保持時間10秒の条件で測定することができる。試験片の表面は、研磨機(例えば自動研磨機Rana-3:IMT)等により表面を平滑にし、汚れ等を取り除くことが望ましい。
<Vickers hardness>
Vickers hardness can be measured according to Japanese Industrial Standard JIS Z2244:2009 (Vickers hardness test - test method). A hardness meter (for example, Micro Vickers hardness meter HMV-G21: Shimadzu Corporation) is used to measure the Vickers hardness. Vickers hardness can be measured, for example, under the conditions of a test temperature of 25° C., a test force of 100 gf, a diamond indenter approach speed of 20 μm/s, and a test force retention time of 10 seconds. It is desirable that the surface of the test piece be smoothed using a polishing machine (for example, automatic polishing machine Rana-3: IMT) or the like to remove dirt and the like.
[結果]
耐熱性試験、体積抵抗率、抵抗温度係数(TCR)、耐熱性試験、ビッカース硬さを第1表に示す。
[result]
Table 1 shows the heat resistance test, volume resistivity, temperature coefficient of resistance (TCR), heat resistance test, and Vickers hardness.
耐熱試験を行った実施例1~3では、供試体の抵抗値の変化率が概ね0~0.20%、或いは0~0.40%の間に収まっている。したがって、本実施形態に係るNi-Cr-Mo合金を抵抗体材料として用いた場合に、200℃の高温においても、抵抗体材料の抵抗値の変化率を安定化できることがわかる。これらの抵抗値の変化率は、十分に低く、良好な値であると考えられるが、いずれの実施例においても、加熱開始から250時間までの間において、抵抗値変化率が顕著に観測されていることがわかる。また、概ね250時間以降は、抵抗値の変化率が横這いとなっていることがわかる。 In Examples 1 to 3 in which the heat resistance test was conducted, the rate of change in resistance value of the specimens was generally within the range of 0 to 0.20% or 0 to 0.40%. Therefore, it can be seen that when the Ni-Cr-Mo alloy according to this embodiment is used as a resistor material, the rate of change in resistance value of the resistor material can be stabilized even at a high temperature of 200°C. These rates of change in resistance value are considered to be sufficiently low and good values, but in all examples, the rate of change in resistance value was significantly observed for 250 hours from the start of heating. I know that there is. Furthermore, it can be seen that the rate of change in resistance value remains flat after approximately 250 hours.
以上のことから、200℃/250時間の条件の加熱処理を、予め行っておけば、抵抗体材料の抵抗値の変化が安定化し、変化率が小さい状態で、電流検出用抵抗器を回路基板に実装することができる。 From the above, if heat treatment is performed under the conditions of 200°C/250 hours in advance, the change in resistance value of the resistor material will be stabilized, and the current detection resistor can be attached to the circuit board while the rate of change is small. can be implemented in
このことから、本実施形態に係る電流検出用抵抗器によれば、ニッケルとクロムとモリブデンとの合金を含み、合金の全質量比でニッケルを63質量%以上70質量%以下、クロムを8質量%以上22質量%以下、モリブデンを8質量%以上25質量%以下、含有する抵抗体材料によれば、より高い温度領域において、抵抗値の安定化を高いレベルで実現できる。 From this, the current detection resistor according to the present embodiment includes an alloy of nickel, chromium, and molybdenum, and the total mass ratio of the alloy is 63% by mass or more and 70% by mass or less of nickel, and 8% by mass of chromium. According to a resistor material containing molybdenum in an amount of 8% to 25% by mass, stabilization of the resistance value can be achieved at a high level in a higher temperature range.
1 電流検出用抵抗器
11 本体部
12 第一接続部
13 第二接続部
14 第一起立部
15 第二起立部
16 実装面用めっき層
17 ボンディング用めっき層
100 回路基板
110 絶縁基板
120 回路パターン
130 ワイヤーボンディング
1
Claims (8)
抵抗体材料の板体から形成され、
前記抵抗体材料は、ニッケルとクロムとモリブデンとの合金を含み、
前記合金の全質量比で前記ニッケルを63質量%以上70質量%以下、
前記クロムを8質量%以上22質量%以下、
前記モリブデンを8質量%以上25質量%以下、含有し、
200℃にて1000時間経過後の抵抗値の変化率が±0.50%の範囲内である、
電流検出用抵抗器。 A current detection resistor,
Formed from a plate of resistor material,
The resistor material includes an alloy of nickel, chromium, and molybdenum,
The nickel is 63% by mass or more and 70% by mass or less in the total mass ratio of the alloy,
The chromium is 8% by mass or more and 22% by mass or less,
Containing the molybdenum in an amount of 8% by mass or more and 25% by mass or less,
The rate of change in resistance value after 1000 hours at 200°C is within ±0.50%,
Resistor for current detection.
前記抵抗体材料のビッカース硬さが200HV以上240HV以下である、
電流検出用抵抗器。 The current detection resistor according to claim 1,
The Vickers hardness of the resistor material is 200 HV or more and 240 HV or less,
Resistor for current detection.
矩形状であり、実装面に対向し、前記実装面から所定間隔離間して配置される本体部と、
前記実装面に接続される第一接続部と、
前記実装面に接続される第二接続部と、を有し、
前記第一接続部及び前記第二接続部がめっき層を備える、
電流検出用抵抗器。 The current detection resistor according to claim 2,
a main body portion having a rectangular shape, facing the mounting surface and disposed at a predetermined distance from the mounting surface;
a first connection part connected to the mounting surface;
a second connection part connected to the mounting surface,
the first connection portion and the second connection portion include a plating layer;
Resistor for current detection.
前記抵抗体材料は、200℃以上の耐熱性を有する、
電流検出用抵抗器。 The current detection resistor according to any one of claims 1 to 3,
The resistor material has a heat resistance of 200° C. or more,
Resistor for current detection.
ニッケルとクロムとモリブデンとの合金を含み、前記合金の全質量比で前記ニッケルを63質量%以上70質量%以下、前記クロムを8質量%以上22質量%以下、前記モリブデンを8質量%以上25質量%以下、含有し、200℃にて1000時間経過後の抵抗値の変化率が±0.50%の範囲内である抵抗体材料の板体を所定形状にプレス加工する、
電流検出用抵抗器の製造方法。 A method of manufacturing a current detection resistor, the method comprising:
Including an alloy of nickel, chromium, and molybdenum, the total mass ratio of the alloy is 63% to 70% by mass of nickel, 8% to 22% by mass of chromium, and 8% to 25% by mass of molybdenum. % by mass or less, and the rate of change in resistance after 1000 hours at 200 ° C. is pressed into a predetermined shape .
A method of manufacturing a current detection resistor.
前記プレス加工後に、前記抵抗体材料のビッカース硬さが200HV以上240HV以下になるような処理を行う、
電流検出用抵抗器の製造方法。 A method for manufacturing a current detection resistor according to claim 5, comprising:
After the press working, a treatment is performed so that the Vickers hardness of the resistor material is 200 HV or more and 240 HV or less,
A method of manufacturing a current detection resistor.
前記プレス加工の前に、前記抵抗体材料のビッカース硬さが220HV以上290HV以下になるような処理を行う、
電流検出用抵抗器の製造方法。 A method for manufacturing a current detection resistor according to claim 5 or 6, comprising:
Before the press working, a treatment is performed so that the Vickers hardness of the resistor material is 220 HV or more and 290 HV or less,
A method of manufacturing a current detection resistor.
前記プレス加工の前に行う第1の加熱処理と、
前記プレス加工の後に行う第2の加熱処理と、を含む
電流検出用抵抗器の製造方法。 A method for manufacturing a current detection resistor according to any one of claims 5 to 7, comprising:
a first heat treatment performed before the press working;
A method of manufacturing a current detection resistor, comprising: a second heat treatment performed after the press working.
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JP7089555B2 (en) | 2022-06-22 |
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