JPH07122407A - Structure of metallic resistor - Google Patents
Structure of metallic resistorInfo
- Publication number
- JPH07122407A JPH07122407A JP5262839A JP26283993A JPH07122407A JP H07122407 A JPH07122407 A JP H07122407A JP 5262839 A JP5262839 A JP 5262839A JP 26283993 A JP26283993 A JP 26283993A JP H07122407 A JPH07122407 A JP H07122407A
- Authority
- JP
- Japan
- Prior art keywords
- metal resistor
- resistor
- solder
- metal
- width
- 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
Landscapes
- Details Of Resistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はＤＣ−ＤＣコンバータ
ーに用いる制御用ＩＣの出力制御をするため等に用いら
れる電流検出のための板状抵抗に係わり、特に金属抵抗
体の構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-like resistor for current detection used for controlling the output of a control IC used in a DC-DC converter, and more particularly to the structure of a metal resistor.
【０００２】[0002]
【従来の技術】図２に基づいて説明する。図２は従来の
逆Ｕ字形に整形した金属抵抗体の構造を示す説明図であ
り、（ａ）は正面図、（ｂ）は側面図である。例えばＤ
Ｃ−ＤＣコンバーターに用いる制御用ＩＣの出力制御を
する金属抵抗体は７ないし１０ｍΩ（目標１０ｍΩ）の
低い抵抗値であり、これに３Ａの電流を流し電流低下分
を測定し、制御用ＩＣの出力制御をしている。この金属
抵抗体の寸法は幅０．７５ｍｍ、金属抵抗体の有効長さ
は３．５ｍｍの小さいものであり、抵抗値の計算はＲ＝
（ρ×Ｌ）／Ｓ（Ｒは抵抗値、ρは金属の比抵抗、Ｌは
金属抵抗体の有効長さ、Ｓは金属抵抗体の断面積）に基
づいて決めている。そしてこのような金属抵抗体を回路
基板上の導体パターン間あるいはＩＣのリード端子間に
搭載してはんだで固着して用いる。2. Description of the Related Art A description will be given with reference to FIG. 2A and 2B are explanatory views showing the structure of a conventional metal resistor shaped in an inverted U shape, where FIG. 2A is a front view and FIG. 2B is a side view. For example D
The metal resistor that controls the output of the control IC used in the C-DC converter has a low resistance value of 7 to 10 mΩ (target 10 mΩ). The output is controlled. The size of this metal resistor is 0.75 mm in width, and the effective length of the metal resistor is 3.5 mm, which is small. The calculation of the resistance value is R =
(Ρ × L) / S (R is the resistance value, ρ is the specific resistance of the metal, L is the effective length of the metal resistor, and S is the cross-sectional area of the metal resistor). Then, such a metal resistor is mounted between the conductor patterns on the circuit board or between the lead terminals of the IC and fixed by soldering for use.
【０００３】従来金属抵抗体の有効長さＬは、図２
（ａ）に示す一方の立ち上がり部１ａから他方の立ち上
がり部１ｂとして抵抗値の計算をしている。しかし金属
抵抗体１の接続部２をはんだ３等を介して端子４に接続
する場合、金属抵抗体１の側面１ｃに、はんだ３の表面
張力によりはんだ這い上がり部５が発生し、実際の金属
抵抗体１の有効長さＬは、一方のはんだ這い上がり部先
端５ａからはんだ他方の這い上がり部先端５ｂ迄とな
り、金属抵抗体１の有効長さＬは計算値より短くなって
いる。また金属抵抗体１の表面状態（例えば表面の汚れ
等）によりはんだ這い上がり部先端５ａ、５ｂの位置が
ばらついているのが現状である。The effective length L of the conventional metal resistor is shown in FIG.
The resistance value is calculated from one rising portion 1a to the other rising portion 1b shown in (a). However, when the connection portion 2 of the metal resistor 1 is connected to the terminal 4 via the solder 3 or the like, the solder creep-up portion 5 is generated on the side surface 1c of the metal resistor 1 due to the surface tension of the solder 3, and the actual metal The effective length L of the resistor 1 is from the tip 5a of the solder creep-up portion to the tip 5b of the solder creep-up portion, and the effective length L of the metal resistor 1 is shorter than the calculated value. In addition, under the present circumstances, the positions of the solder crawling up tips 5a and 5b are varied depending on the surface condition of the metal resistor 1 (for example, surface dirt).
【０００４】[0004]
【発明が解決しようとする課題】前述の方法によれば、
実際の金属抵抗体の有効長さＬは計算上の金属抵抗体の
有効長さＬより短くなっているため、金属抵抗体の抵抗
値が低くなり、かつ抵抗値のバラツキもはんだ這い上が
り部先端位置の変動により２０ないし３０％と広範囲と
なっている。According to the method described above,
Since the effective length L of the actual metal resistor is shorter than the calculated effective length L of the metal resistor, the resistance value of the metal resistor is low, and the variation in the resistance value is also the tip of the solder crawling portion. It has a wide range of 20 to 30% due to changes in position.
【０００５】この発明は前記の問題点に鑑みてなされた
ものであり、その目的は計算上の金属抵抗体の有効長さ
Ｌが確保され、抵抗値のバラツキがない金属抵抗体の構
造を提供することにある。The present invention has been made in view of the above problems, and an object thereof is to provide a structure of a metal resistor in which a calculated effective length L of the metal resistor is secured and the resistance value does not vary. To do.
【０００６】[0006]
【課題を解決するための手段】この発明によれば前述の
目的は、電子回路装置の電流検出に用いる板状抵抗であ
る金属抵抗体の両端の接続部周辺に、それぞれ切欠を設
けることにより達成される。さらに金属抵抗体の切欠は
板状抵抗全幅の少なくとも２／３であること、金属抵抗
体の切欠幅は少なくとも１ｍｍであることが有効であ
る。According to the present invention, the above-mentioned object is achieved by providing notches around the connecting portions at both ends of a metal resistor which is a plate-like resistor used for detecting a current in an electronic circuit device. To be done. Furthermore, it is effective that the notch of the metal resistor is at least ⅔ of the total width of the plate-shaped resistor, and the notch width of the metal resistor is at least 1 mm.
【０００７】[0007]
【作用】この発明は、はんだが表面張力により金属抵抗
体の側面に這い上がる性質を有効に利用するものであ
り、接続部周辺に切欠を設け板状抵抗全幅より狭い導体
部を設けることにより、金属抵抗体の側面の表面積が小
さくなり、金属抵抗体の側面の表面状態（例えば表面の
汚れ等）の影響をはんだが受けにくくなる。このことに
よりはんだの這い上がり量を均一に近くすることがで
き、導体部全面をはんだで覆うことが可能となる。この
はんだが導体となり、金属抵抗体が本来持っている導体
部抵抗値の影響を受けることなく電流を流すことができ
る。その後金属抵抗体に電流が流れることになるので、
計算上の金属抵抗体の有効長さＬが確保され、規定の抵
抗値を得ることができる。The present invention effectively utilizes the property that the solder crawls on the side surface of the metal resistor due to the surface tension. By providing a notch around the connection portion and providing a conductor portion narrower than the full width of the plate resistance, The surface area of the side surface of the metal resistor becomes small, and the solder is less likely to be affected by the surface condition of the side surface of the metal resistor (for example, dirt on the surface). As a result, the amount of solder creeping up can be made nearly uniform, and the entire conductor portion can be covered with solder. This solder becomes a conductor, and a current can flow without being affected by the resistance value of the conductor portion which the metal resistor originally has. After that, an electric current will flow through the metal resistor, so
The calculated effective length L of the metal resistor is secured, and a specified resistance value can be obtained.
【０００８】なお金属抵抗体の切欠は板状抵抗全幅の少
なくとも２／３であること、金属抵抗体の切欠幅は少な
くても１ｍｍであることとしたのは、各種構造のサンプ
ルを製作し抵抗値を測定したものから見出したものであ
る。The notch of the metal resistor is at least ⅔ of the total width of the plate-like resistor, and the notch width of the metal resistor is at least 1 mm. It is found from the measured values.
【０００９】[0009]
【実施例】図１に基づいて説明する。図１はこの実施例
の逆Ｕ字形に整形した金属抵抗体の構造を示す説明図で
あり、（ａ）は正面図、（ｂ）は側面図である。なお従
来例と同一の機能要素を有するものは同一符号を付して
ある。図１（ｂ）に示すように接続部２の上方に切欠７
を設け導体部６を形成し、導体部幅９は板状抵抗全幅１
１の１／３とし、導体部６の切欠幅１０は１ｍｍとす
る。この数値の決定に当たっては各種構造のサンプルを
製作し抵抗値を測定したものから見出したものである。
このようにして製作した金属抵抗体１の接続部２をはん
だ３等を介して端子４に接続する。この時のはんだ這い
上がり部先端５ａ、５ｂの位置は前記実験値による構造
寸法としているため、金属抵抗体端面８ａ、８ｂと一致
することができる。したがって端子４と金属抵抗体端面
８ａ、８ｂとの間は、はんだ３が導体となり金属抵抗体
の抵抗値は金属抵抗体端面８ａ、８ｂとの間で規定され
ることになり、計算上の抵抗値と実際上の抵抗値が一致
する金属抵抗体１を得ることが可能となる。EXAMPLE An explanation will be given with reference to FIG. 1A and 1B are explanatory views showing the structure of a metal resistor shaped into an inverted U-shape according to this embodiment. FIG. 1A is a front view and FIG. 1B is a side view. Those having the same functional elements as those in the conventional example are designated by the same reference numerals. As shown in FIG. 1B, the notch 7 is formed above the connecting portion 2.
And the conductor portion 6 is formed, and the conductor portion width 9 is 1
The cutout width 10 of the conductor 6 is 1 mm. In the determination of this numerical value, it was found out by making samples of various structures and measuring the resistance value.
The connecting portion 2 of the metal resistor 1 thus manufactured is connected to the terminal 4 via the solder 3 or the like. At this time, since the positions of the tips 5a and 5b of the solder crawling portion are set to the structural dimensions based on the above-described experimental values, they can coincide with the metal resistor end faces 8a and 8b. Therefore, the solder 3 serves as a conductor between the terminal 4 and the metal resistor end faces 8a and 8b, and the resistance value of the metal resistor is defined between the metal resistor end faces 8a and 8b. It is possible to obtain the metal resistor 1 whose value and actual resistance value match.
【００１０】なおこの金属抵抗体１を接続するスペース
に余裕が有る場合は、導体部幅９と導体部６の切欠幅１
０を実験的に求めることにより、逆Ｕ字形に整形しない
板状の金属抵抗体を用いても同様の結果を得られること
を確認している。When there is a sufficient space for connecting the metal resistor 1, the conductor portion width 9 and the notch width 1 of the conductor portion 6 are provided.
By experimentally obtaining 0, it has been confirmed that similar results can be obtained even if a plate-shaped metal resistor that is not shaped into an inverted U shape is used.
【００１１】[0011]
【発明の効果】この発明によれば、金属抵抗体の両端の
接続部周辺にそれぞれ切欠を設け、金属抵抗体の切欠は
板状抵抗全幅の少なくとも２／３であること、金属抵抗
体の切欠幅は少なくとも１ｍｍであることとしたため、
端子と金属抵抗体端面の両端との間は、はんだが導体と
なり金属抵抗体の抵抗値は金属抵抗体端面の両端との間
で規定されることになり、計算上の抵抗値と実際上の抵
抗値が一致する金属抵抗体を得ることが可能となる。According to the present invention, notches are provided around the connection portions at both ends of the metal resistor, and the notch of the metal resistor is at least ⅔ of the full width of the plate-shaped resistor. Since the width is at least 1 mm,
Between the terminal and both ends of the metal resistor end face, the solder becomes a conductor and the resistance value of the metal resistor is defined between the both ends of the metal resistor end face. It is possible to obtain a metal resistor having the same resistance value.
【図１】この実施例の逆Ｕ字形に整形した金属抵抗体の
構造を示す説明図であり、（ａ）は正面図、（ｂ）は側
面図である1A and 1B are explanatory views showing a structure of a metal resistor shaped into an inverted U shape according to this embodiment, in which FIG. 1A is a front view and FIG. 1B is a side view.
【図２】従来の逆Ｕ字形に整形した金属抵抗体の構造を
示す説明図であり、（ａ）は正面図、（ｂ）は側面図で
ある2A and 2B are explanatory views showing a structure of a conventional metal resistor shaped in an inverted U shape, where FIG. 2A is a front view and FIG. 2B is a side view.
１ 金属抵抗体 １ａ、１ｂ 立ち上がり部 １ｃ 側面 ２ 接続部 ３ はんだ ４ 端子 ５ はんだ這い上がり部 ５ａ、５ｂ はんだ這い上がり部先端 ６ 導体部 ７ 切欠 ８ａ、８ｂ 金属抵抗体端面 ９ 導体部幅 １０ 切欠幅 １１ 板状抵抗全幅 DESCRIPTION OF SYMBOLS 1 Metal resistor 1a, 1b Rising part 1c Side surface 2 Connection part 3 Solder 4 Terminal 5 Solder crawling up part 5a, 5b Solder crawling up tip 6 Conductor part 7 Notch 8a, 8b Metal resistor end face 9 Conductor width 10 Notch width 11 Plate resistance full width
Claims (3)
であり、その両端の接続部周辺にそれぞれ切欠を設ける
ことを特徴とする金属抵抗体の構造。1. A structure of a metal resistor, which is a plate-shaped resistor used in a current circuit of an electronic circuit device, characterized in that notches are provided around the connection portions at both ends thereof.
抗体の切欠は前記板状抵抗全幅の少なくとも２／３であ
ることを特徴とする金属抵抗体の構造。2. The structure of the metal resistor according to claim 1, wherein the notch of the metal resistor is at least ⅔ of the full width of the plate-shaped resistor.
抗体の切欠幅は少なくとも１ｍｍであることを特徴とす
る金属抵抗体の構造。3. The structure of the metal resistor according to claim 1, wherein the notch width of the metal resistor is at least 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5262839A JPH07122407A (en) | 1993-10-21 | 1993-10-21 | Structure of metallic resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5262839A JPH07122407A (en) | 1993-10-21 | 1993-10-21 | Structure of metallic resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07122407A true JPH07122407A (en) | 1995-05-12 |
Family
ID=17381338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5262839A Pending JPH07122407A (en) | 1993-10-21 | 1993-10-21 | Structure of metallic resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122407A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023051442A (en) * | 2021-09-30 | 2023-04-11 | ダイキン工業株式会社 | Power conversion device and freezer |
-
1993
- 1993-10-21 JP JP5262839A patent/JPH07122407A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023051442A (en) * | 2021-09-30 | 2023-04-11 | ダイキン工業株式会社 | Power conversion device and freezer |
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