JPH02143174A - Current detector - Google Patents
Current detectorInfo
- Publication number
- JPH02143174A JPH02143174A JP63298585A JP29858588A JPH02143174A JP H02143174 A JPH02143174 A JP H02143174A JP 63298585 A JP63298585 A JP 63298585A JP 29858588 A JP29858588 A JP 29858588A JP H02143174 A JPH02143174 A JP H02143174A
- Authority
- JP
- Japan
- Prior art keywords
- current
- load
- current detection
- produced
- magnetic
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 230000004907 flux Effects 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- 239000000696 magnetic material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 2
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 2
- 241001070941 Castanea Species 0.000 description 1
- 235000014036 Castanea Nutrition 0.000 description 1
- 101150031329 Ets1 gene Proteins 0.000 description 1
- 101700004678 SLIT3 Proteins 0.000 description 1
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電流検出装置に関し、特に磁性体と磁電変換素
子を使用した電流検出装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a current detection device, and more particularly to an improvement of a current detection device using a magnetic material and a magnetoelectric conversion element.
（従来の技術）
第３図に示すように、負荷駆動回路５がら電線４ａ、４
ｂを介して負荷６に供給される負荷電流ＩＬを検出する
ために、電線のソース側（負荷駆動回路から負荷に向っ
て電流が流れる側）４８、又はジンク側（負荷から負荷
駆動回路に向って電源が流れる側）４ｂのいずれか一方
を環状磁性体１に巻線しく図示例ではソース側に巻線し
ている）、負荷電流ＩＬによって発生する磁束Ｂｏを、
環状磁性体１のスリット２に押設された磁電変換素子３
によって検出するようにした電流検出装置が従来より知
られている。(Prior Art) As shown in FIG.
In order to detect the load current IL supplied to the load 6 via the wire 48, the source side (the side where the current flows from the load drive circuit to the load) 48 or the zinc side (the side where the current flows from the load to the load drive circuit) is connected. The magnetic flux Bo generated by the load current IL is
Magnetoelectric conversion element 3 pressed into slit 2 of annular magnetic body 1
A current detection device that detects a current using the following has been known.
この電流検出装置によれば、電流ＩＬによって発生ずる
磁束ＢＯが磁電変換素子３によって電圧Ｖｏに変換され
、該電圧Ｖｏにより電流ＩＬが検出される。According to this current detection device, the magnetic flux BO generated by the current IL is converted into the voltage Vo by the magnetoelectric conversion element 3, and the current IL is detected by the voltage Vo.
（５Ｆ３明が解決しようとする課題）
通常、電線４ａ、４ｂ及び負荷６と大地（１位の基準点
）との間には対地容１７が、また電線間には線間容量が
存在し、これらの容量の変化によるノイズ電流、及び電
源電圧変動等によるノイズの電流が電線４ａ、４ｂを流
れる。上記従来の電流検出装置によれば、これらのノイ
ズ電流のうち電線のソース側４ａ及びジンク側４ｂを同
一方向に流れる同相ノイズ電流（第３図のＩＮ）はその
まま検出されてしまうため、上記対地容ｆｆｉ等の変化
あるいは電源電圧変動等の影響を受は易く、電流検出値
が安定しないという問題があった。(Problem that 5F3 Akira is trying to solve) Normally, there is a ground capacity 17 between the electric wires 4a, 4b and the load 6 and the earth (first reference point), and there is a line capacitance between the electric wires. Noise currents due to these capacitance changes and noise currents due to power supply voltage fluctuations flow through the electric wires 4a, 4b. According to the above-mentioned conventional current detection device, among these noise currents, the common-mode noise current (IN in Fig. 3) flowing in the same direction on the source side 4a and the zinc side 4b of the electric wire is detected as is. The problem is that the current detection value is not stable because it is easily affected by changes in the capacitance ffi, etc. or fluctuations in the power supply voltage.
本発明は上記問題を解決するためになされたものであり
、同相ノイズ電流の影響を排除して安定した電流検出値
を得ることができる電流検出装置を提供することを目的
とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide a current detection device that can eliminate the influence of common-mode noise current and obtain a stable current detection value.
（課題を解決するための手段）
上記目的を達成するため本発明は、磁性体と磁電変換素
子とを使用した電流検出装置において、被電流検出線の
ソース側とジンク側の両方を、前記磁性体に同方向で且
つ同じ大きさの磁束が発生するように巻線したものであ
る。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a current detection device using a magnetic material and a magnetoelectric transducer, in which both the source side and the zinc side of the current detection line are connected to the magnetic material. The wires are wound so that magnetic flux of the same magnitude and direction is generated around the body.
（作用）
１ｊ！！電流検出線のソース側を流れる同相ノイズ電流
によって磁性体内に発生する磁束と、ジンク側を流れる
同相ノイズ電流によって磁性体内に発生ずる磁束とが互
いに打ち消し合う一方、ソース側及びジンク側を流れる
負荷電流によって発生する磁束は互いに加算される。(action) 1j! ! The magnetic flux generated inside the magnetic body by the common-mode noise current flowing on the source side of the current detection line and the magnetic flux generated inside the magnetic body due to the common-mode noise current flowing on the zinc side cancel each other out, while the load current flowing on the source side and the zinc side The magnetic fluxes generated by are added to each other.
（実施例）
以下本発明の一実施例を添（す図面を参照して説明する
。(Example) An example of the present invention will be described below with reference to the accompanying drawings.
ＥｔＳ１図は本発明に係る電流検出装置生栗部の構成図
であり、同図中１は環状磁性体である。この環状磁性体
１には負荷駆動回路５から負荷６に向って電流が流れる
電線（１＆電流検出線）のソース側４ａ、及び負荷６か
ら負荷駆動回路５に向って電流が流れる電線のジンク側
４ｂが巻線されている。ここで、電線のソース側及びジ
ンク側は、電線のソース側４ａを流れる負荷電流ＩＬａ
によって磁性体１に発生する磁束Ｂａと、電流のジンク
側４ｂを流れる負荷電流ｌＬｂによって磁性体ｌに発生
する磁束Ｂｂとが同一ノｙ向で且つ同じ大きさどなるよ
うに巻線される。Figure EtS1 is a configuration diagram of the raw chestnut part of the current detection device according to the present invention, and numeral 1 in the figure is a ring-shaped magnetic body. This annular magnetic body 1 has a source side 4a of an electric wire (1 & current detection line) through which current flows from the load drive circuit 5 toward the load 6, and a zinc side of the electric wire through which current flows from the load 6 toward the load drive circuit 5. 4b is wound. Here, the source side and the zinc side of the electric wire are the load current ILa flowing through the source side 4a of the electric wire.
The magnetic flux Ba generated in the magnetic body 1 by this and the magnetic flux Bb generated in the magnetic body 1 by the load current LLb flowing through the zinc side 4b of the current are wound in the same direction and with the same magnitude.
尚、ノイズ電流を含まない負荷電流ＩＬａ、Ｉｔｂの値
は互いに等しくなる。Note that the values of the load currents ILa and Itb, which do not include noise current, are equal to each other.
環状磁性体Ｉはスリット２を有し、該スリット２には磁
電変換素子３が押設されている。この磁電液、換素子と
しては、例えばマグネトダイオードあるいはホール素子
を用いることができるが、本実施例ではポール素子を使
用している。The annular magnetic body I has a slit 2, into which a magnetoelectric conversion element 3 is pressed. For example, a magneto diode or a Hall element can be used as the magneto-electro-liquid exchange element, but in this embodiment, a pole element is used.
ホール素子３に接続される回路は、第２図に示すように
、基準電流ｉ （定電流）を供給する電流源８がホール
素子３の端子３ｃ、３ｄの間に接続され、ホール素子３
の出力端子３ａ、３ｂが差動アンプ９に接続されている
。ホール素子３を貫通する磁束に応じた電圧Ｖｏが差動
アンプ９により増幅され、オフセットゲイン調整回路ｌ
Ｏを介して制御器１１に供給される。オフセットゲイン
調整回路１０は、ホール索子３の特性ばらつきを補償す
るとともに、検出すべきＴ４流の大きさに応じて制御器
１１に供給する出力値のレベル調整を行う回路である。As shown in FIG. 2, in the circuit connected to the Hall element 3, a current source 8 supplying a reference current i (constant current) is connected between terminals 3c and 3d of the Hall element 3.
Output terminals 3a and 3b of are connected to a differential amplifier 9. A voltage Vo corresponding to the magnetic flux passing through the Hall element 3 is amplified by a differential amplifier 9, and an offset gain adjustment circuit l
It is supplied to the controller 11 via O. The offset gain adjustment circuit 10 is a circuit that compensates for variations in the characteristics of the Hall cable 3 and adjusts the level of the output value supplied to the controller 11 in accordance with the magnitude of the T4 flow to be detected.
制御器１１は、検出した電流値に基づいて負荷駆動Ｕ路
５を介して、負荷（本実施例ではモータ）６へ供給する
電流の制御を行う。The controller 11 controls the current supplied to the load (motor in this embodiment) 6 via the load drive U path 5 based on the detected current value.
以上のように構成される電流検出装置の作用を、第１図
に示すように対地容量７の変化及び１１１電圧変動等に
起因する同和ノイズ電流ＩＮがある場合について説明す
る。The operation of the current detection device configured as described above will be described in the case where there is a dot sum noise current IN caused by a change in the ground capacitance 7, a voltage fluctuation 111, etc., as shown in FIG.
先ず、電線のソース側４ａを流れる負荷電流ＪＬ８によ
ってＪＩＳ’４Ｅする磁束Ｉ３ａと、同相ノイズ電流Ｉ
Ｎによって発生する磁束ΔＢａとは同一方向となる。−
１１，ｍ線のジンク側４ｂを流れる負荷？ｌ流ＩＬｂに
よって５１生ずる磁束Ｂｂは、前記Ｉｔａによる磁束Ｂ
ａと同一方向となり、同和ノイズ電流ＩＮによって発生
する磁束ΔＢ ｂは逆方向となる。従って、全体の磁束
Ｂｏは、
ｌ３ｏ＝Ｂａ＋Ｂｂ＋Δｌ３ａ−△１３ｂとなるが、Ｂ
ａ＝Ｊ３ｂ、ΔＢ ａ＝Δ［３ｂとなるように巻線しで
あるので、Ｂｏ＝２１３ａとなる。First, the JIS'4E magnetic flux I3a due to the load current JL8 flowing through the source side 4a of the wire and the common mode noise current I
The magnetic flux ΔBa generated by N is in the same direction. −
11. Load flowing through the zinc side 4b of the m line? The magnetic flux Bb generated by 1 flow ILb is equal to the magnetic flux B due to Ita.
The direction is the same as that of a, and the magnetic flux ΔB b generated by the dotted noise current IN is in the opposite direction. Therefore, the total magnetic flux Bo is l3o=Ba+Bb+Δl3a−Δ13b, but B
Since the wires are wound so that a=J3b, ΔB a=Δ[3b, Bo=213a.
この全体の磁束ＢＯによるホール素子３の出力電圧Ｖｏ
は、Ｖｏ＝：１３ｏＸｉ＝２１３−ａＸｉとなり、同和
ノイズ電流Ｉ＋＋は検出されず、その影響を排除するこ
とができる。The output voltage Vo of the Hall element 3 due to this entire magnetic flux BO
is Vo=:13oXi=213-aXi, so that the dotted noise current I++ is not detected and its influence can be eliminated.
本実施例における負荷電流は周波数が２０ＫＩＩｚ程度
のパルス電流であり、この場合に上記効果が特にＷＩ著
に表われるが、これに限るものではなく、上述の？ｌ！
流検小検出装置流電流及び交流電流のいずれの場合にも
適用可能である。The load current in this embodiment is a pulse current with a frequency of about 20KIIz, and in this case, the above effect is particularly apparent in WI, but it is not limited to this, and the above-mentioned ? l!
The small current detection device is applicable to both current and alternating current.
（発明の効果）
以上詳述したように本発明は、磁性体と磁電変換素子と
を使用した電流検出装置において、被電流検出線のソー
ス側とジンク側の両方を、前記磁性体に同方向で且つ洞
じ大きさの磁束が発生するように巻線したので、同相ノ
イズ電流の影響を排除して安定した電流検出値を得るこ
とができるという効果を奏する。(Effects of the Invention) As detailed above, the present invention provides a current detection device using a magnetic material and a magnetoelectric transducer, in which both the source side and the zinc side of the current detection line are connected to the magnetic material in the same direction. Since the wires are wound so as to generate a magnetic flux as large as a tunnel, it is possible to eliminate the influence of common-mode noise current and obtain a stable current detection value.
第１図は本発明に係る電流検出装置主要部の構成図、第
２図はホール素子の周辺回路構成を示す図、第３図は従
来の電流検出装置主要部の構成図である。
１・・・環状磁性体（磁性体）、２・・・スリット ３
・・・ホール素子（磁電変換素子）、４ａ・・・電線（
被電流検出線）のソース側、４ｂ・・・ｉｌｕ線（被電
流検出線）のジンク側。FIG. 1 is a block diagram of a main part of a current detection device according to the present invention, FIG. 2 is a diagram showing a peripheral circuit structure of a Hall element, and FIG. 3 is a block diagram of a main part of a conventional current detection device. 1... Annular magnetic body (magnetic body), 2... Slit 3
... Hall element (magnetoelectric conversion element), 4a ... electric wire (
4b...the zinc side of the ilu line (current detection line).
Claims (1)
おいて、被電流検出線のソース側とジンク側の両方を、
前記磁性体に同方向で且つ同じ大きさの磁束が発生する
ように巻線したことを特徴とする電流検出装置。1. In a current detection device using a magnetic material and a magnetoelectric conversion element, both the source side and the zinc side of the current detection line are
A current detection device characterized in that the magnetic body is wound with wires so as to generate magnetic fluxes of the same direction and magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63298585A JP2526815B2 (en) | 1988-11-25 | 1988-11-25 | Current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63298585A JP2526815B2 (en) | 1988-11-25 | 1988-11-25 | Current detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02143174A true JPH02143174A (en) | 1990-06-01 |
| JP2526815B2 JP2526815B2 (en) | 1996-08-21 |
Family
ID=17861644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63298585A Expired - Lifetime JP2526815B2 (en) | 1988-11-25 | 1988-11-25 | Current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2526815B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019138735A (en) * | 2018-02-08 | 2019-08-22 | 新電元工業株式会社 | Current detection device, current detection system, and method for correcting current detection device |
-
1988
- 1988-11-25 JP JP63298585A patent/JP2526815B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019138735A (en) * | 2018-02-08 | 2019-08-22 | 新電元工業株式会社 | Current detection device, current detection system, and method for correcting current detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2526815B2 (en) | 1996-08-21 |
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