JP2005181056A - Resistor for current detection - Google Patents

Resistor for current detection Download PDF

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JP2005181056A
JP2005181056A JP2003421106A JP2003421106A JP2005181056A JP 2005181056 A JP2005181056 A JP 2005181056A JP 2003421106 A JP2003421106 A JP 2003421106A JP 2003421106 A JP2003421106 A JP 2003421106A JP 2005181056 A JP2005181056 A JP 2005181056A
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current
resistor
terminal
current terminal
resistance element
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Michiya Hashizume
道也 橋爪
Koji Maeda
耕司 前田
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Microjenics Inc
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Microjenics Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress power loss, and to improve current detection accuracy, by devising a lead-out spot for a voltage terminal of a resistor for current detection and a material of a current terminal or the voltage terminal itself. <P>SOLUTION: This resistor for current detection comprises a resistance element 1 and the plate-shaped current terminals 2, fixed to its right and left sides. A material, having higher conductivity than the resistance element, is used for the current terminals. In each current terminal, the outside is used as a current terminal body part 3, and the inside has three-forked branch pieces 4, 5, 6, and the two front-and-rear branch pieces are used as connection parts for the resistance element, and the center branch piece is bent and used as the voltage terminal. In another example of this resistor for current detection, the whole area, in the longitudinal width of the inside end of each current terminal, is used as the connection part 8 for the resistance element. Each current terminal has three-forked branch pieces 9, 10, 11, branching from the connection part for the resistance element between the current terminal body part and the connection part for the resistance element; and the two front-and-rear branch pieces are used as conduction parts, and the tip of the center branch piece is cut off from the current terminal body part, and the center branch piece is bent and used as the voltage terminal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、低抵抗値で、大電流容量の電流検出用抵抗器に関する。   The present invention relates to a current detecting resistor having a low resistance value and a large current capacity.

上述した電流検出用抵抗器の従来技術としては図６に示すように、矩形状の抵抗体９１の長手方向側面より電圧端子９２を突出し、抵抗体９１の左右端部を電流端子９３としたものが存在する（特許文献１参照）。
特開２００２−４８８２１号公報 As a prior art of the above-described current detection resistor, as shown in FIG. 6, a voltage terminal 92 protrudes from the side surface in the longitudinal direction of a rectangular resistor 91, and left and right ends of the resistor 91 are current terminals 93. (See Patent Document 1).
JP 2002-48821 A

ところが上述した従来技術は、電圧端子９２の引き出し箇所が、電流端子９３よりも内側であるため、図７に示すように抵抗素子９４の途中から電圧端子９２を引き出していることになり、電流端子９３，９３間の抵抗値Ｒと電圧端子９２，９２間の抵抗値Ｒ’とは差２ｒが出ることになり、その分だけ電力ロスが発生することになる。   However, in the above-described prior art, the voltage terminal 92 is drawn out from the current terminal 93, so that the voltage terminal 92 is drawn from the middle of the resistance element 94 as shown in FIG. There is a difference 2r between the resistance value R between 93 and 93 and the resistance value R ′ between the voltage terminals 92 and 92, and a power loss is generated accordingly.

さらに、電圧端子の引き出し箇所は抵抗体の長手方向側面である。そして、図６に示すように電流端子９３の縦幅中央部には嵌合用の抜穴９５があけてあり、その抜穴９５の周囲が電流発生器（測定対象物）との取付箇所（接続箇所）となる。従って、仮に取付位置ａが電圧端子を引き出している側とは反対側に偏った場合には、両取付位置間の電流密度は高くなり、一方、電圧端子側では電流密度は低くなる。従って、電流密度の低い箇所から電圧端子９２を引き出していることになり、取付箇所のバラツキにより発生する電流密度の変化の影響を受け易く、検出精度に悪影響を与える。   Furthermore, the lead-out location of the voltage terminal is the longitudinal side surface of the resistor. As shown in FIG. 6, a fitting hole 95 is formed in the center of the vertical width of the current terminal 93, and the periphery of the hole 95 is an attachment point (connection) to the current generator (measurement object). ). Therefore, if the mounting position a is deviated to the side opposite to the side from which the voltage terminal is drawn, the current density between both mounting positions is high, while the current density is low on the voltage terminal side. Therefore, the voltage terminal 92 is drawn out from a location where the current density is low, and is easily affected by a change in current density caused by variations in the attachment location, which adversely affects detection accuracy.

本発明は上記実情を考慮して創作されたもので、その目的とするところは、電力ロスが少なく、しかも電流検出精度を向上できる電流検出用抵抗器を提供することである。   The present invention was created in view of the above circumstances, and an object of the present invention is to provide a current detection resistor that can reduce power loss and improve current detection accuracy.

請求項１の発明の電流検出用抵抗器は、抵抗体と、抵抗体の左右に固定する板状の電流端子とからなる。そして、電流端子は、抵抗体よりも導電率の良い素材を用い、その外側を電流端子本体部とし、その内側には三つ又に分かれる分岐片を有し、前後２つの分岐片を抵抗体用接続部とすると共に、中央の分岐片を折り曲げて電圧端子としてあることを特徴とする。   The current detection resistor according to the first aspect of the present invention includes a resistor and plate-like current terminals fixed to the left and right of the resistor. The current terminal is made of a material having a conductivity higher than that of the resistor. The outer side of the current terminal is a current terminal main body. The inner side of the current terminal has a branch piece that is divided into three parts. And a voltage terminal by bending the central branch piece.

三本の分岐片のうち中央のものを電圧端子として用いることにより、電圧端子の引き出し箇所が電流端子の縦幅中央部となる。そして、電流端子に電流発生装置（測定対象物）を取り付ける際の取付位置が仮に電流端子の縦幅方向の前側縁部に偏っており、前後の分岐片である抵抗体用接続部に流れる電流に差があっても、縦幅中央部は後側縁部に比べれば、電流密度が高い。従って、後側縁部から電圧端子を引き出すよりは、縦幅中央部から電圧端子を引き出した方が電流密度が高く、前側縁部の左右の取付箇所間に流れる電流密度に近似しており、抵抗体に流れる電流を左右の電圧端子間の測定電圧から精度良く検出できる。また、取付位置が縦幅方向でばらついたとしても、高い確率で縦幅中央部が最も高い電流密度となることからも、縦幅中央部から電圧端子を引き出すことが、電流検出精度を向上できると言える。   By using the central one of the three branch pieces as the voltage terminal, the lead-out portion of the voltage terminal becomes the central portion of the vertical width of the current terminal. And the attachment position at the time of attaching a current generator (measuring object) to a current terminal is temporarily biased to the front side edge in the longitudinal width direction of the current terminal, and the current that flows in the resistor connection part that is a front and rear branch piece Even if there is a difference, the current density is higher in the central part in the vertical width than in the rear edge. Therefore, rather than pulling out the voltage terminal from the rear edge, the current density is higher when the voltage terminal is pulled out from the center of the vertical width, and approximates the current density flowing between the left and right mounting locations of the front edge, The current flowing through the resistor can be accurately detected from the measured voltage between the left and right voltage terminals. In addition, even if the mounting position varies in the vertical width direction, it is possible to improve the current detection accuracy by drawing out the voltage terminal from the vertical width central portion because the central portion of the vertical width has the highest current density with high probability. It can be said.

請求項２の発明の電流検出用抵抗器は次の点を特徴とする。電流端子は、その内側端部の縦幅全域を抵抗体用接続部とし、電流端子本体部と抵抗体用接続部の間には抵抗体用接続部側から三つ又に分かれる分岐片を有し、前後二つの分岐片を導通部とすると共に、中央の分岐片の先端を電流端子本体部から切り離し、その中央の分岐片を折り曲げて電圧端子としてある点である。   The current detecting resistor according to the invention of claim 2 is characterized by the following points. The current terminal has a resistor connecting portion in the entire longitudinal width of the inner end thereof, and has a branch piece that is divided into three from the resistor connecting portion side between the current terminal main body portion and the resistor connecting portion, The two front and rear branch pieces are used as a conductive portion, the tip of the central branch piece is separated from the current terminal main body portion, and the central branch piece is bent to form a voltage terminal.

請求項１の発明は、抵抗体よりも導電率の良い（抵抗率の低い）素材を、電流端子として用いると共に、その電流端子の一部を電圧端子として用いることから、抵抗体と同一素材で電流端子や電圧端子を形成するものに比べれば、電力ロスを少なくできる。また、三本の分岐片のうち中央のものを電圧端子として用いることにより、電圧端子の引き出し箇所が電流端子の縦幅中央部となり、これによって、電流端子への電流発生装置（測定対象物）を取り付ける際の取付位置に関係なく、抵抗体に流れる電流を左右の電圧端子間の測定電圧から精度良く検出できる。さらに、電流端子の一部を折り曲げるだけで電圧端子を作成できるので、非常に製作しやすいと言える。   In the first aspect of the present invention, a material having better conductivity (lower resistivity) than a resistor is used as a current terminal, and a part of the current terminal is used as a voltage terminal. The power loss can be reduced as compared with those forming current terminals and voltage terminals. In addition, by using the central one of the three branch pieces as the voltage terminal, the lead-out location of the voltage terminal becomes the central portion of the vertical width of the current terminal, whereby a current generator for the current terminal (measurement object) Regardless of the mounting position when mounting, the current flowing through the resistor can be accurately detected from the measured voltage between the left and right voltage terminals. Furthermore, it can be said that it is very easy to manufacture because the voltage terminal can be created simply by bending a part of the current terminal.

請求項２の発明も、同様の効果を有することに加え、抵抗体用接続部が電流端子の縦幅全域に亘って形成してあることから、接続面積が請求項１の発明よりも広く確保でき、抵抗体と電流端子との固定が強固になる。   In addition to having the same effect, the invention of claim 2 has a connection area for the resistor that is wider than that of the invention of claim 1 because the resistor connecting portion is formed over the entire width of the current terminal. It is possible to fix the resistor and the current terminal firmly.

本発明の電流検出用抵抗器の第一例は図１、図２に示すように、四角形の抵抗体１と、抵抗体１の左右に接続する帯状の２つの電流端子２とから構成される。そして、左右に間隔をあけて配置した二つの電流端子２，２の内側端部の上に、抵抗体１の左右端部を載せて溶接、導電ペースト等で固定して、直列接続する。   As shown in FIGS. 1 and 2, the first example of the current detection resistor according to the present invention includes a rectangular resistor 1 and two strip-shaped current terminals 2 connected to the left and right of the resistor 1. . Then, the left and right end portions of the resistor 1 are placed on the inner end portions of the two current terminals 2 and 2 that are arranged at a distance from each other on the left and right sides, and are fixed in series by welding, conductive paste, or the like.

電流端子２は、抵抗体１よりも導電率の良い素材、例えば銅を用いる。また、電流端子２は、平板状であって、縦幅を抵抗体１と殆ど同じ長さに形成し、その外側を電流端子本体３とし、内側にはＥ字状の三つ又に分かれる分岐片４，５，６を有する。   The current terminal 2 is made of a material having a conductivity higher than that of the resistor 1, for example, copper. The current terminal 2 has a flat plate shape, the vertical width of which is almost the same as that of the resistor 1, the outer side of which is the current terminal main body 3, and the inner side of the branch piece 4 is divided into three E-shaped branches. , 5 and 6.

前後の分岐片４．６は、抵抗体用接続部となり、その先部に抵抗体１を載せて固定する。一方、中央の分岐片５は、前後の分岐片４，６よりも長く形成し、その根元部分から折り曲げて電圧端子としてある。また、三本の分岐片４，５，６は縦幅方向に間隔７をあけて配置してあるので、その間隔７によって中央分岐片５の電圧端子と前後分岐片４，６の抵抗用接続部との絶縁が確保される。従って、電流発生器に対する電流端子本体部３の取付箇所が仮に前縁部に偏って、その結果、前後の抵抗体用接続部４，６に流れる電流に差があっても、間隔７によって電圧端子５は後側抵抗体用接続部６とは絶縁されていることから、後側抵抗体用接続部６を流れる電流の影響を全く受けることなく、常に縦幅中央部を引き出し箇所とすることができ、電流検出精度を向上できる。   The front and rear branch pieces 4.6 serve as a resistor connecting portion, and the resistor 1 is placed and fixed on the front end portion. On the other hand, the central branch piece 5 is formed longer than the front and rear branch pieces 4 and 6, and is bent from its root portion to serve as a voltage terminal. Further, since the three branch pieces 4, 5 and 6 are arranged at an interval 7 in the longitudinal width direction, the resistor 7 connects the voltage terminal of the central branch piece 5 and the front and rear branch pieces 4 and 6 by the interval 7. Insulation with the part is ensured. Therefore, even if the current terminal main body 3 is attached to the current generator at a position where the current terminal main body 3 is attached to the front edge, as a result, the current flowing through the front and rear resistor connecting portions 4 and 6 is different. Since the terminal 5 is insulated from the rear resistor connecting portion 6, the center portion of the vertical width is always used as the extraction portion without being affected by the current flowing through the rear resistor connecting portion 6. Current detection accuracy can be improved.

電流端子２は銅であるので、抵抗体１とは比較にならないほど抵抗値が小さく、電流端子２の抵抗値は０と考えても良いことから、第一例を図３の電気回路図で示せば、抵抗体１の両端から電流端子２と電圧端子５が延びていることになり、このことからも電力ロスが少なく、電流検出精度が向上することが分かる。   Since the current terminal 2 is copper, the resistance value is so small that it cannot be compared with the resistor 1, and the resistance value of the current terminal 2 may be considered to be 0, so the first example is shown in the electric circuit diagram of FIG. If it shows, the current terminal 2 and the voltage terminal 5 will be extended from the both ends of the resistor 1, and also from this, it turns out that there is little power loss and current detection accuracy improves.

本発明の電流検出用抵抗器の第二例は図４、図５に示すように、電流端子２の形状に特徴がある。電流端子２は、その内側端部の縦幅全域を抵抗体用接続部８とし、電流端子本体部３と抵抗体用接続部８の間には、抵抗体用接続部８側からＥ字状の三つ又に分かれる分岐片９，１０，１１を有している。前後の分岐片９，１１は、電流端子本体部３と抵抗体用接続部８を短絡する導通部となる。一方、中央の分岐片１０は、その先端が電流端子本体部３とは切り離してあり、その根元部分から折り曲げて電圧端子としてある。   The second example of the current detection resistor of the present invention is characterized by the shape of the current terminal 2 as shown in FIGS. The current terminal 2 has a resistor connecting portion 8 in the entire longitudinal width of the inner end thereof, and an E shape is formed between the current terminal main body portion 3 and the resistor connecting portion 8 from the resistor connecting portion 8 side. Branching pieces 9, 10, 11 divided into three parts. The front and rear branch pieces 9 and 11 serve as a conduction portion that short-circuits the current terminal main body portion 3 and the resistor connection portion 8. On the other hand, the tip of the central branch piece 10 is separated from the current terminal main body 3 and is bent from its root portion to serve as a voltage terminal.

前後の分岐片９，１１である導通部に流れる電流に差があっても、双方の導通部の先端には抵抗体用接続部８が連続しており、抵抗体用接続部８の縦幅中央部から中央の分岐片１０である電圧端子が引き出されているので、電流差の影響が緩和されて、高精度に電流検出することができる。   Even if there is a difference in the current flowing through the conduction portions which are the front and rear branch pieces 9 and 11, the resistor connection portion 8 is continuous at the tips of both conduction portions, and the vertical width of the resistor connection portion 8. Since the voltage terminal that is the central branch piece 10 is drawn from the central portion, the influence of the current difference is mitigated, and the current can be detected with high accuracy.

（イ）図は本発明の電流検出用抵抗器の第一例の組立斜視図、（ロ）図は分解斜視図である。(A) is an assembled perspective view of a first example of the current detecting resistor of the present invention, and (b) is an exploded perspective view. 第一例を平面から視た図である。It is the figure which looked at the 1st example from the plane. 第一例の電気回路図である。It is an electric circuit diagram of the first example. （イ）図は本発明の電流検出用抵抗器の第二例の組立斜視図、（ロ）図は分解斜視図である。(A) is an assembled perspective view of a second example of the current detection resistor of the present invention, and (b) is an exploded perspective view. 第二例を平面から視た図である。It is the figure which looked at the 2nd example from the plane. 従来の電流検出用抵抗器の平面図である。It is a top view of the conventional resistor for electric current detection. 従来の電流検出用抵抗器の電気回路図である。It is an electric circuit diagram of the conventional resistor for current detection.

符号の説明Explanation of symbols

１ 抵抗体
２ 電流端子
３ 電流端子本体部
４、６ 分岐片（抵抗体用接続部）
５ 分岐片（電圧端子）
８ 抵抗体用接続部
９，１１ 分岐片（導通部）
１０ 分岐片（電圧端子）
DESCRIPTION OF SYMBOLS 1 Resistor 2 Current terminal 3 Current terminal main-body part 4 and 6 Branch piece (resistor connection part)
5 Branch piece (voltage terminal)
8 Connections for resistors 9,11 Branch piece (conduction part)
10 Branch piece (voltage terminal)

Claims (2)

抵抗体（１）と、抵抗体（１）の左右に固定する板状の電流端子（２）とからなり、
電流端子（２）は、抵抗体（１）よりも導電率の良い素材を用い、その外側を電流端子本体部（３）とし、その内側には三つ又に分かれる分岐片（４，５，６）を有し、前後２つの分岐片（４，６）を抵抗体用接続部とすると共に、中央の分岐片（５）を折り曲げて電圧端子としてあることを特徴とする電流検出用抵抗器。 It consists of a resistor (1) and plate-like current terminals (2) fixed to the left and right of the resistor (1).
The current terminal (2) is made of a material having a conductivity higher than that of the resistor (1), and the outer side of the current terminal (3) is the current terminal body (3). The current detecting resistor is characterized in that the two branch pieces (4, 6) at the front and rear are used as a resistor connecting portion, and the central branch piece (5) is bent as a voltage terminal. 抵抗体（１）と、抵抗体（１）の左右に固定する板状の電流端子（２）とからなり、
電流端子（２）は、抵抗体（１）よりも導電率の良い素材を用い、その外側を電流端子本体部（３）とし、その内側端部の縦幅全域を抵抗体用接続部（８）とし、電流端子本体部（３）と抵抗体用接続部（８）の間には抵抗体用接続部（８）側から三つ又に分かれる分岐片（９，１０，１１）を有し、前後二つの分岐片（９，１１）を導通部とすると共に、中央の分岐片（１０）の先端を電流端子本体部（３）から切り離し、その中央の分岐片（１０）を折り曲げて電圧端子としてあることを特徴とする電流検出用抵抗器。 It consists of a resistor (1) and plate-like current terminals (2) fixed to the left and right of the resistor (1).
The current terminal (2) is made of a material having a conductivity higher than that of the resistor (1), the outer side thereof is the current terminal main body (3), and the entire length of the inner end is connected to the resistor connecting portion (8 ) And between the current terminal body (3) and the resistor connection (8), there are branch pieces (9, 10, 11) that are divided in three from the resistor connection (8) side. The two branch pieces (9, 11) are used as a conducting portion, the tip of the central branch piece (10) is separated from the current terminal main body (3), and the central branch piece (10) is bent to serve as a voltage terminal. A resistor for current detection characterized by being.
JP2003421106A 2003-12-18 2003-12-18 Resistor for current detection Pending JP2005181056A (en)

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