JPH10116710A - Current detecting resistor - Google Patents
Current detecting resistorInfo
- Publication number
- JPH10116710A JPH10116710A JP8267247A JP26724796A JPH10116710A JP H10116710 A JPH10116710 A JP H10116710A JP 8267247 A JP8267247 A JP 8267247A JP 26724796 A JP26724796 A JP 26724796A JP H10116710 A JPH10116710 A JP H10116710A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- current
- terminal
- slit
- resistance value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3421—Leaded components
- H05K3/3426—Leaded components characterised by the leads
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばプリント基
板に実装して使用される電流検出用抵抗器に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting resistor mounted on a printed circuit board, for example.
【０００２】[0002]
【従来の技術】従来、この種の電流検出用抵抗器は、金
属箔からなる抵抗体の両端に別部材のリード端子を取り
付け、はんだ付け部分を除いて全体を樹脂モールドした
構成となっている。2. Description of the Related Art Conventionally, this type of current detecting resistor has a structure in which lead terminals of separate members are attached to both ends of a resistor made of a metal foil, and the whole is resin-molded except for a soldered portion. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の構成のものは、抵抗体が金属箔からなるため、最近
要望が高まってきた電流容量の大きなものや、極低抵抗
値を有するものが得にくく、また、端子部を別部材で構
成する必要があるため、構造が複雑になり、コストも高
いものとなる。さらに、樹脂モールド構造のため、高温
での使用に耐えるものが得られないという問題もあっ
た。However, in the above-mentioned conventional structure, since the resistor is made of a metal foil, a resistor having a large current capacity and a resistor having an extremely low resistance value, which have recently been demanded, can be obtained. However, the structure is complicated and the cost is high because the terminal portion needs to be formed by a separate member. Further, there is a problem that a resin that can be used at a high temperature cannot be obtained due to the resin mold structure.
【０００４】本発明は、このような従来技術の問題点を
解消するものであり、大電流容量、極低抵抗値、かつ高
温での使用に耐えうる電流検出用抵抗器を提供すること
を目的とする。An object of the present invention is to solve such a problem of the prior art, and to provide a current detecting resistor capable of withstanding a large current capacity, an extremely low resistance value and a high temperature. And
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
に、本発明の電流検出用抵抗器は、金属板からなる短冊
状の抵抗体の両端からそれぞれ切り込んだスリットを設
け、各端における前記スリットにより分離された一方を
電流端子、他方を電圧端子とし、前記スリット先端間の
抵抗値ｒの抵抗器に流れる電流Ｉを、前記電圧端子間の
測定電圧Ｖから、Ｉ＝Ｖ／ｒにより検出する構成とす
る。In order to achieve the above object, a current detecting resistor according to the present invention is provided with slits cut from both ends of a strip-shaped resistor made of a metal plate, and the above-mentioned slit at each end is provided. One of the terminals separated by the slit is a current terminal, and the other is a voltage terminal. A current I flowing through a resistor having a resistance value r between the slit tips is detected from a measured voltage V between the voltage terminals by I = V / r. Configuration.
【０００６】上記構成によれば、金属板からなる抵抗体
を用いるため、大電流容量、極低抵抗値を有する抵抗器
を得ることができ、かつモールド不要の構造になるから
高温雰囲気での使用が可能になる。さらに、切り込みの
深さを調節することにより、種々の抵抗値のものが容易
に作製できる。According to the above structure, since a resistor made of a metal plate is used, a resistor having a large current capacity and an extremely low resistance value can be obtained. Further, since the structure does not require a mold, it can be used in a high-temperature atmosphere. Becomes possible. Further, by adjusting the depth of the cut, various resistance values can be easily produced.
【０００７】また、電流端子および電圧端子のはんだ付
け箇所に予備はんだ、あるいはスズメッキ，ニッケルメ
ッキまたは銅メッキを施すことによって、はんだ付け性
を向上する。このとき、電流検出用抵抗器としての抵抗
値は、スリット先端間の寸法で決定されるので、予備は
んだやメッキを施す部分の寸法精度を厳しく抑える必要
がなく、コスト的にも有利である。Further, the solderability is improved by applying a preliminary solder or tin plating, nickel plating or copper plating to the soldering portions of the current terminal and the voltage terminal. At this time, since the resistance value of the current detecting resistor is determined by the dimension between the slit tips, it is not necessary to strictly suppress the dimensional accuracy of the portion to be pre-soldered or plated, which is advantageous in cost.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態につい
て詳細に説明する。図１は本発明の一実施の形態におけ
る電流検出用抵抗器を示したもので、１は金属板からな
る短冊状の抵抗体、２はその抵抗体１の両端からそれぞ
れ切り込んだスリットで、その先端を２aとする。抵抗
体１の各端におけるスリット２により分離された一方を
電流端子１a、他方を電圧端子１bとする。このようにス
リット２を設けた抵抗体１は、図２に示したように、各
端子部を、プリント基板への取り付けに便利な形状に折
り曲げ加工を施す。Embodiments of the present invention will be described below in detail. FIG. 1 shows a current detecting resistor according to an embodiment of the present invention, wherein 1 is a strip-shaped resistor made of a metal plate, and 2 is a slit cut out from both ends of the resistor 1, respectively. The tip is 2a. One of the ends of the resistor 1 separated by the slit 2 is defined as a current terminal 1a, and the other is defined as a voltage terminal 1b. In the resistor 1 provided with the slits 2 as described above, as shown in FIG. 2, each terminal portion is bent into a shape convenient for attachment to a printed circuit board.
【０００９】ここで、電流検出用抵抗器が実際に使用さ
れる場合の状態を等価回路で示してみると、図５のよう
になる。即ち、抵抗体１の両スリット先端２a間の抵抗
値をｒ、スリット２の長さを略同じとして、電流端子１
a部分の抵抗値をΔｒ1、電圧端子１b部分の抵抗値をΔ
ｒ2とし、また、電流検出用抵抗器と直列に接続される
負荷抵抗をＲL、電圧計の内部抵抗をＲVとすると、一般
的に、ＲL≫ｒ，Δｒ1であるから、Δｒ1による電流Ｉ
の誤差は無視できる。また、ＲV≫ｒ，Δｒ2であるか
ら、Δｒ2の電流≒０となる。従って、電圧端子１b間の
測定電圧Ｖから、抵抗体１に流れる電流ＩはＩ＝Ｖ／ｒ
により検出することができる。つまり、電流検出用抵抗
器としての抵抗値は、スリット先端２a間の寸法で決定
される。FIG. 5 shows an equivalent circuit of a state where the current detecting resistor is actually used. That is, assuming that the resistance value between the two slit tips 2a of the resistor 1 is r and the length of the slit 2 is substantially the same, the current terminal 1
The resistance of the part a is Δr 1 , and the resistance of the voltage terminal 1b is Δ
and r 2, also when the load resistance connected in series with a current detecting resistor R L, the internal resistance of the voltmeter and R V, in general, R L >> R, since it is [Delta] r 1, [Delta] r Current I by 1
Is negligible. Further, since R V ≫r, Δr 2 , the current Δr 2 becomes ≒ 0. Accordingly, from the measured voltage V between the voltage terminals 1b, the current I flowing through the resistor 1 is I = V / r
Can be detected. That is, the resistance value of the current detection resistor is determined by the dimension between the slit tips 2a.
【００１０】図４は、銅−ニッケル合金の幅３mm、板厚
0.2mmの抵抗材で、スリット先端２aの切り込み深さを変
えた場合の、スリット先端２a間の距離に対する抵抗値
を示したものである。このように、同一外形、同一板厚
の抵抗材において、金型の一部を増設、あるいはレーザ
カット等の方法で、スリット２の切り込み深さを変える
ことにより、種々の抵抗値を得ることができる。FIG. 4 shows a copper-nickel alloy having a width of 3 mm and a plate thickness.
This is a graph showing a resistance value with respect to the distance between the slit tips 2a when the cutting depth of the slit tips 2a is changed with a resistance material of 0.2 mm. In this way, various resistance values can be obtained by adding a part of the mold or changing the cutting depth of the slit 2 by a method such as laser cutting in a resistance material having the same outer shape and the same plate thickness. it can.
【００１１】図３は、電流検出用抵抗器の端子部のはん
だ付け性を向上するために、電流端子１aおよび電圧端
子１bのはんだ付け箇所に予備はんだ３、あるいはスズ
メッキ，ニッケルメッキまたは銅メッキを施したもので
ある。このとき、電流端子１aや電圧端子１bの抵抗値が
変化しても、スリット先端２a間の抵抗値ｒが変化しな
いかぎり、電流検出には影響はない。従って、予備はん
だやメッキを施す部分の寸法精度が要求されないので、
コストダウンが図れる。FIG. 3 shows that the soldering of the current terminal 1a and the voltage terminal 1b is pre-soldered 3 or tin-plated, nickel-plated or copper-plated in order to improve the solderability of the terminals of the current detecting resistor. It was done. At this time, even if the resistance value of the current terminal 1a or the voltage terminal 1b changes, the current detection is not affected as long as the resistance value r between the slit tips 2a does not change. Therefore, the dimensional accuracy of the parts to be pre-soldered or plated is not required,
Cost reduction can be achieved.
【００１２】[0012]
【発明の効果】以上説明したように、本発明によれば、
次のような効果がある。As described above, according to the present invention,
The following effects are obtained.
【００１３】 金属板からなる抵抗体で構成するの
で、大電流容量、極低抵抗値の電流検出用抵抗器を作製
することができる。[0013] Since the resistor is made of a metal plate, a current detecting resistor having a large current capacity and an extremely low resistance value can be manufactured.
【００１４】 モールド不要の構造になり、従来のも
のより高温度雰囲気での使用が可能になる。The structure does not require a mold, so that it can be used in a higher temperature atmosphere than the conventional one.
【００１５】 スリット先端間の寸法を変えることに
より、各種抵抗値の電流検出用抵抗器を作製することが
でき、コストダウンが図れる。By changing the dimension between the slit tips, current detecting resistors having various resistance values can be manufactured, and cost can be reduced.
【００１６】 はんだ付け部分に予備はんだやメッキ
を施しても、電流検出用抵抗器の抵抗値はスリット先端
間の寸法で決定されるので、予備はんだ等の寸法の高精
度は必要なく、コスト低減を図ることができる。Even if the soldering portion is pre-soldered or plated, the resistance value of the current detection resistor is determined by the dimension between the slit tips, so that high precision of the dimensions of the pre-soldering and the like is not required and cost reduction Can be achieved.
【図１】本発明の一実施の形態における抵抗体形状を示
す図である。FIG. 1 is a diagram showing a resistor shape according to an embodiment of the present invention.
【図２】本発明の一実施の形態の抵抗体の端子部を折り
曲げて最終形状とした図である。FIG. 2 is a diagram showing a terminal portion of a resistor according to an embodiment of the present invention bent to a final shape.
【図３】端子のはんだ付け部に予備はんだ等を施したも
のの図である。FIG. 3 is a view of a pre-solder or the like applied to a soldered portion of a terminal.
【図４】スリット先端間の距離に対する抵抗値を示す図
である。FIG. 4 is a diagram showing a resistance value with respect to a distance between slit tip ends.
【図５】電流検出用抵抗器が実際に使用される場合の等
価回路を示す図である。FIG. 5 is a diagram showing an equivalent circuit when a current detection resistor is actually used.
１…抵抗体、 １a…電流端子、 １b…電圧端子、 ２
…スリット、 ２a…先端、 ３…予備はんだ。DESCRIPTION OF SYMBOLS 1 ... Resistor, 1a ... Current terminal, 1b ... Voltage terminal, 2
... Slit, 2a ... Tip, 3 ... Pre-soldering.
Claims (3)
らそれぞれ切り込んだスリットを設け、各端における前
記スリットにより分離された一方を電流端子、他方を電
圧端子とし、前記スリット先端間の抵抗値ｒの抵抗器に
流れる電流Ｉを、前記電圧端子間の測定電圧Ｖから、Ｉ
＝Ｖ／ｒにより検出することを特徴とする電流検出用抵
抗器。1. A strip-shaped resistor made of a metal plate provided with slits cut from both ends thereof, one of the ends separated by the slit as a current terminal, the other as a voltage terminal, and a resistance between the ends of the slit. The current I flowing through the resistor having the value r is calculated from the measured voltage V between the voltage terminals by I
= Current detection resistor characterized by detecting by V / r.
所に予備はんだを施していることを特徴とする請求項１
記載の電流検出用抵抗器。2. Preliminary solder is applied to soldering portions of a current terminal and a voltage terminal.
The resistor for current detection according to the above.
所にスズメッキ，ニッケルメッキ若しくは銅メッキを施
していることを特徴とする請求項１記載の電流検出用抵
抗器。3. The current detection resistor according to claim 1, wherein the soldering portions of the current terminal and the voltage terminal are plated with tin, nickel or copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8267247A JPH10116710A (en) | 1996-10-08 | 1996-10-08 | Current detecting resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8267247A JPH10116710A (en) | 1996-10-08 | 1996-10-08 | Current detecting resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10116710A true JPH10116710A (en) | 1998-05-06 |
Family
ID=17442188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8267247A Pending JPH10116710A (en) | 1996-10-08 | 1996-10-08 | Current detecting resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10116710A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000133501A (en) * | 1998-10-23 | 2000-05-12 | Matsushita Electric Ind Co Ltd | Resistor |
| JP2006186264A (en) * | 2004-12-28 | 2006-07-13 | Taiyosha Electric Co Ltd | Resistor of four terminal structure |
| JP2007078599A (en) * | 2005-09-16 | 2007-03-29 | Hitachi Ltd | Resistor for current detection and controller |
| JP2013157596A (en) * | 2012-01-06 | 2013-08-15 | Rohm Co Ltd | Chip resistor, and method for manufacturing chip resistor |
| JP2020074456A (en) * | 2012-01-06 | 2020-05-14 | ローム株式会社 | Resistor |
| WO2023050889A1 (en) * | 2021-09-28 | 2023-04-06 | 中兴通讯股份有限公司 | Current measurement circuit, circuit board assembly, and current detection device |
-
1996
- 1996-10-08 JP JP8267247A patent/JPH10116710A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000133501A (en) * | 1998-10-23 | 2000-05-12 | Matsushita Electric Ind Co Ltd | Resistor |
| JP2006186264A (en) * | 2004-12-28 | 2006-07-13 | Taiyosha Electric Co Ltd | Resistor of four terminal structure |
| JP2007078599A (en) * | 2005-09-16 | 2007-03-29 | Hitachi Ltd | Resistor for current detection and controller |
| JP2013157596A (en) * | 2012-01-06 | 2013-08-15 | Rohm Co Ltd | Chip resistor, and method for manufacturing chip resistor |
| JP2020074456A (en) * | 2012-01-06 | 2020-05-14 | ローム株式会社 | Resistor |
| WO2023050889A1 (en) * | 2021-09-28 | 2023-04-06 | 中兴通讯股份有限公司 | Current measurement circuit, circuit board assembly, and current detection device |
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