JPS6361961A - Current detector - Google Patents
Current detectorInfo
- Publication number
- JPS6361961A JPS6361961A JP61206171A JP20617186A JPS6361961A JP S6361961 A JPS6361961 A JP S6361961A JP 61206171 A JP61206171 A JP 61206171A JP 20617186 A JP20617186 A JP 20617186A JP S6361961 A JPS6361961 A JP S6361961A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- circuit
- hall element
- output voltage
- amplifier circuit
- 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
- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 230000005291 magnetic effect Effects 0.000 claims abstract description 14
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ホール素子を用いた電流検出器に係り、特
に高蹟度化を図った電流検出器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a current detector using a Hall element, and particularly to a current detector that is designed to be highly sensitive.
′ｄＳ６図はこの種の従来の電流検出器を示す斜視図で
ある（センサ技術、１９８２年１１月号参照）。図にお
いて、■は被検出電流工か流れる電線、２は電線１の一
部を取り囲む同周形状の強磁性体コアで、被検出電流工
によって発生する磁界Ｂの導磁路となっている。３は強
磁性体コア２の端面２ａと２ｂの間の磁気ギャップ（エ
アギャップ）Ｇ内に配設されたホール素子、４はホール
素子３の制御′ｒＭ、流ｉの人力リート、５はホール素
子３の駆動回路で、人力リード４を介してホール素子３
に制御電流ｉを供給する。６はホール素子３の出力電圧
を取り出すための出力リート、７はホール素子３の出力
信号を増幅する増幅回路である。Figure 'dS6 is a perspective view showing this type of conventional current detector (see Sensor Technology, November 1982 issue). In the figure, ■ is an electric wire flowing through the electric wire to be detected, and 2 is a ferromagnetic core having the same circumferential shape surrounding a part of the electric wire 1, and serves as a magnetic conduction path for the magnetic field B generated by the electric wire to be detected. 3 is a Hall element disposed in the magnetic gap (air gap) G between the end surfaces 2a and 2b of the ferromagnetic core 2; 4 is the control 'rM of the Hall element 3; 5 is the manual control of the flow i; 5 is the Hall element; The drive circuit for the element 3 connects the Hall element 3 via the human lead 4.
A control current i is supplied to. 6 is an output lead for taking out the output voltage of the Hall element 3, and 7 is an amplifier circuit for amplifying the output signal of the Hall element 3.
第７図は上記駆動回路５の詳細を示す図であり、図中、
Ｒ０〜Ｒ４は抵抗、８はオペアンプ（演算増幅器）であ
る。FIG. 7 is a diagram showing details of the drive circuit 5, and in the figure,
R0 to R4 are resistors, and 8 is an operational amplifier.
従来の電流検出器は上記のように構成されておリ、駆動
回路５によってホール素子３にあらかじめ制御電流ｉが
供給されている。そして、電線１に被検出電流工が流れ
ると、その被検出電流工に比例した磁界Ｂが強磁性体コ
ア２を通して発生するようになっている。従って、強磁
性体コア２の両端面２ａ、２ｂ間に配置されたホール素
子３には、発生した磁界Ｂと制御電流ｉの積に比例した
電圧信号、即ち、被検出電流工と制御電流ｉの積に比例
した出力信号が発生し、これを出カリードロから取り出
して、増幅回路７により増幅し、第７図のオペアンプ８
の出力電圧Ｖとして取り出せるようになっている。The conventional current detector is configured as described above, and the control current i is supplied to the Hall element 3 by the drive circuit 5 in advance. When a current to be detected flows through the electric wire 1, a magnetic field B proportional to the current to be detected is generated through the ferromagnetic core 2. Therefore, the Hall element 3 disposed between both end surfaces 2a and 2b of the ferromagnetic core 2 receives a voltage signal proportional to the product of the generated magnetic field B and the control current i. An output signal proportional to the product of
It can be extracted as the output voltage V.
第８図は、上記増幅回路７の増幅度Ｇ（倍）と出力電圧
Ｖ （Ｖ）の理想の温度特性図であり、温度変化に対し
て増幅度Ｇ及び出力電圧Ｖは変化がなく、それぞれＧ、
、Ｖ、で常に一定となっている。FIG. 8 is an ideal temperature characteristic diagram of the amplification degree G (double) and the output voltage V (V) of the amplifier circuit 7, and the amplification degree G and output voltage V do not change with respect to temperature changes. G.
, V, is always constant.
しかし、例えば強磁性体コア２の材質がフェライトでＧ
ａＡｓ系のホール素子３の組合せの場合には、温度係数
が−８００〜−１０００ｐｐｍ７℃の温度特性をもって
いる。従って、高精度の電流検出を行うことが非常に困
難である。However, for example, the material of the ferromagnetic core 2 is ferrite and G
In the case of a combination of aAs-based Hall elements 3, the temperature coefficient has a temperature characteristic of -800 to -1000 ppm and 7°C. Therefore, it is very difficult to perform highly accurate current detection.
従来の電流検出器は上記のように構成され、強磁性体コ
ア２とホール素子３の温度特性があるため、温度変化に
よってホール素子３の出力電圧■が変化し、従って検出
に誤差が生じ、高精度に電流検出を行うことができない
という問題点があった。The conventional current detector is configured as described above, and since the ferromagnetic core 2 and the Hall element 3 have temperature characteristics, the output voltage of the Hall element 3 changes due to temperature changes, and therefore errors occur in detection. There was a problem in that current detection could not be performed with high precision.
この発明は、このような問題点を解決するためになされ
たもので、温度変化に対して誤差がなく、高精度に電流
検出を行うことが可能な電流検出器を提供することを目
的としている。This invention was made to solve these problems, and aims to provide a current detector that is free from errors due to temperature changes and is capable of highly accurate current detection. .
この発明の電流検出器は、回収形状を有する電路の一部
に磁気ギャップが設けられた強磁性体コアと、その磁気
ギャップ内に配設されたホール素子と、このホール素子
及び該ホール素子の出力信号を増幅する増幅回路等が実
装された回路基板とを備えた電流検出器において、前記
ホール素子の出力信号の増幅回路に温度補償回路を付加
したものである。The current detector of the present invention includes a ferromagnetic core in which a magnetic gap is provided in a part of an electric path having a collection shape, a Hall element disposed within the magnetic gap, and a Hall element and the Hall element. This current detector includes a circuit board on which an amplifier circuit or the like for amplifying an output signal is mounted, and a temperature compensation circuit is added to the amplifier circuit for the output signal of the Hall element.
〔作用）
温度補償回路は、温度変化によるホール素子の出力電圧
（電圧信号）の誤差を解消し、従って高精度に電流検出
が行われる。[Function] The temperature compensation circuit eliminates errors in the output voltage (voltage signal) of the Hall element due to temperature changes, and therefore current detection is performed with high precision.
以下、この発明の一実施例を図面について説明する。な
お、従来と同一または相１１１する部分については、同
一符号を付して詳細は省略する。An embodiment of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to parts that are the same as or in phase with the conventional parts, and details are omitted.
第１図はこの発明に係る電流検出器の概略の構成図あり
、図中、９はホール素子３、駆動回路５が実装された回
路基板、１０は外部端子である。FIG. 1 is a schematic configuration diagram of a current detector according to the present invention. In the figure, 9 is a circuit board on which a Hall element 3 and a drive circuit 5 are mounted, and 10 is an external terminal.
第２図は上記増幅回路７の詳細を示す図である。この増
幅回路７は、ＰＴＣ（正特性）サーミスタＴＨと抵抗Ｒ
５の並列回路から成る温度補償回路７ａが付加されてお
り、増幅度Ｇに正の温度特性をもたせている。FIG. 2 is a diagram showing details of the amplifying circuit 7. As shown in FIG. This amplifier circuit 7 includes a PTC (positive characteristic) thermistor TH and a resistor R.
A temperature compensation circuit 7a consisting of five parallel circuits is added, giving the amplification degree G a positive temperature characteristic.
次に、第３図ないし第５図の特性図を参照しながら動作
について説明する。Next, the operation will be explained with reference to the characteristic diagrams shown in FIGS. 3 to 5.
第３図はホール素子３の出力信号を一定とし、増幅回路
７の増幅度Ｇに＋８００ ｐｐｍ７℃の温度係数をもた
せた場合の増幅回路７の出力電圧■の温度特性図である
。この場合、増幅度Ｇの変化に比例して＋８００ ｐｐ
ｍ／”Ｃの温度係数をもつため、強磁性体コア２とホー
ル素子３の温度特性による出力電圧Ｖの低下分だけ増幅
度Ｇを増加させれば、出力電圧Ｖを補償することができ
、従って高精度に電流検出を行うことができる。FIG. 3 is a temperature characteristic diagram of the output voltage (2) of the amplifier circuit 7 when the output signal of the Hall element 3 is constant and the amplification degree G of the amplifier circuit 7 has a temperature coefficient of +800 ppm 7°C. In this case, +800 pp in proportion to the change in amplification degree G
Since it has a temperature coefficient of m/''C, the output voltage V can be compensated by increasing the amplification G by the amount of decrease in the output voltage V due to the temperature characteristics of the ferromagnetic core 2 and the Hall element 3. Therefore, current detection can be performed with high accuracy.
次に、増幅度Ｇに温度特性を持たせる方法について説明
すると、第８図に示した従来の増幅回路７における増幅
度Ｇは抵抗Ｒ，とＲ３及び抵抗Ｒ２とＲ４の各々の抵抗
値が等しい条件では、Ｇ＝Ｒ２の抵抗値／ Ｒ＋の抵抗
値であり、従って、増幅度Ｇに温度特性をもたせるには
抵抗Ｒ，，Ｒ２に温度特性をもたせればよい。本実施例
では抵抗Ｒ２と直列にＰＣＴサーミスタＴＨと抵抗Ｒ５
の並列回路を接続してあり、これにより増幅度Ｇに温度
特性をもたせている。第４図は木実施例における増幅回
路７の増幅度Ｇと出力電圧Ｖとの関係を示す図であり、
増幅度Ｇに＋ ８００ ｐｐｍ７℃の温度係数をもたせ
ることにより、出力電圧■は温度補償され、これによっ
て強磁性体コア２とホール素子３の温度特性をキャンセ
ル（解消）させることができる。また、第５図は増幅度
Ｇの温度係数を＋８００〜２０００ｐｐｍ／℃にした場
合の増幅度Ｇと出力電圧Ｖの温度特性を示したものであ
り、出力電圧Ｖにプラス（正）方向の温度特性をもたせ
ることも可能である。Next, to explain how to give temperature characteristics to the amplification degree G, the amplification degree G in the conventional amplifier circuit 7 shown in FIG. The condition is that G=resistance value of R2/resistance value of R+. Therefore, in order to make the amplification degree G have a temperature characteristic, it is sufficient to make the resistors R, , R2 have a temperature characteristic. In this embodiment, a PCT thermistor TH and a resistor R5 are connected in series with the resistor R2.
A parallel circuit is connected, thereby giving the amplification degree G a temperature characteristic. FIG. 4 is a diagram showing the relationship between the amplification degree G and the output voltage V of the amplifier circuit 7 in the tree embodiment,
By giving the amplification degree G a temperature coefficient of +800 ppm 7° C., the output voltage ■ is temperature-compensated, and thereby the temperature characteristics of the ferromagnetic core 2 and the Hall element 3 can be canceled. In addition, Figure 5 shows the temperature characteristics of the amplification degree G and the output voltage V when the temperature coefficient of the amplification degree G is +800 to 2000 ppm/℃. It is also possible to give characteristics.
このように、温度補償回路７ａが強磁性体コア２とホー
ル素子３の温度係数の和による増幅回路７の出力電圧Ｖ
の温度係数とは符号が反対の温度係数を増幅回路７の増
幅度Ｇに与え、強磁性体コア２とホール素子３の温度係
数の和による増幅回路７の出力電圧■の温度特性を補償
しており、温度変化による誤差をなくして電流検出を高
精度に行うことが可能となる。In this way, the temperature compensation circuit 7a adjusts the output voltage V of the amplifier circuit 7 based on the sum of the temperature coefficients of the ferromagnetic core 2 and the Hall element 3.
A temperature coefficient opposite in sign to the temperature coefficient of This makes it possible to eliminate errors caused by temperature changes and perform current detection with high accuracy.
なお、上記実施例では電流検出を目的としており、電流
測定用の電線を含まない状態のもの、たとえば磁界セン
サ、物体検出器等も対象としている。Note that the above embodiments are intended for current detection, and are also intended for devices that do not include electric wires for current measurement, such as magnetic field sensors and object detectors.
（発明の効果〕
以上説明したように、この発明によれば、ホール素子の
出力信号を増幅する増幅回路に温度補償回路を付加した
ため、温度変化による誤差をなくすことができ、高精度
に電流検出を行うことができるという効果がある。(Effects of the Invention) As explained above, according to the present invention, since a temperature compensation circuit is added to the amplifier circuit that amplifies the output signal of the Hall element, errors caused by temperature changes can be eliminated, and current can be detected with high precision. It has the effect of being able to do the following.
第１図はこの発明の一実施例を示す概略構成図、第２図
は第１図の増幅回路の詳細図、第３図はホール素子の出
力信号が一定の場合の増幅回路の増幅度と出力電圧の温
度特性図、第４図は一実施例における増幅回路の増幅度
と出力電圧の温度特性図、第５図は温度係数を大きくし
た時の増幅度と出力電圧の温度特性図、第６図は従来の
電流検出器を示す斜視図、第７図は第６図の増幅回路の
詳細図、第８図は従来における増幅回路の増幅度と出力
電圧の理想の温度特性図、第９図は従来における増幅回
路の増幅度と出力電圧の実際の温度特性図である。
２・・・・・・強磁性体コア
３−・・・・・ホール素子
７・・・・・・増幅回路
７ａ・・・温度補償回路
９・・・・・・回路基板
Ｇ・・・・・・磁気ギャップ
なお、図中同一符号は同一または相当部分を示す。Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a detailed diagram of the amplifier circuit shown in Fig. 1, and Fig. 3 shows the amplification degree of the amplifier circuit when the output signal of the Hall element is constant. FIG. 4 is a temperature characteristic diagram of the amplification degree and output voltage of the amplifier circuit in one embodiment. FIG. 5 is a temperature characteristic diagram of the amplification degree and output voltage when the temperature coefficient is increased. Figure 6 is a perspective view showing a conventional current detector, Figure 7 is a detailed diagram of the amplifier circuit in Figure 6, Figure 8 is a diagram of the ideal temperature characteristics of the amplification degree and output voltage of the conventional amplifier circuit, and Figure 9 is a diagram showing the ideal temperature characteristics of the amplification degree and output voltage of the conventional amplifier circuit. The figure is an actual temperature characteristic diagram of the amplification degree and output voltage of a conventional amplifier circuit. 2...Ferromagnetic core 3-...Hall element 7...Amplification circuit 7a...Temperature compensation circuit 9...Circuit board G... ...Magnetic gap Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (2)
けられた強磁性体コアと、その磁気ギャップ内に配設さ
れたホール素子と、このホール素子及び該ホール素子の
出力信号を増幅する増幅回路等が実装された回路基板と
を備えた電流検出器において、前記ホール素子の出力信
号の増幅回路に温度補償回路を付加したことを特徴とす
る電流検出器。(1) A ferromagnetic core in which a magnetic gap is provided in a part of a magnetic path having a recovery shape, a Hall element disposed within the magnetic gap, and amplification of the Hall element and the output signal of the Hall element. What is claimed is: 1. A current detector comprising: a circuit board on which an amplifier circuit or the like is mounted; characterized in that a temperature compensation circuit is added to the amplifier circuit for the output signal of the Hall element.
＋８００〜＋２０００ｐｐｍ／℃に設定されていること
を特徴とする特許請求の範囲第１項記載の電流検出器。(2) The current detector according to claim 1, wherein the temperature compensation circuit has a temperature coefficient of amplification degree of the amplifier circuit set to +800 to +2000 ppm/°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61206171A JPS6361961A (en) | 1986-09-02 | 1986-09-02 | Current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61206171A JPS6361961A (en) | 1986-09-02 | 1986-09-02 | Current detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6361961A true JPS6361961A (en) | 1988-03-18 |
Family
ID=16518980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61206171A Pending JPS6361961A (en) | 1986-09-02 | 1986-09-02 | Current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6361961A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02259471A (en) * | 1989-03-30 | 1990-10-22 | Tokin Corp | Current detector |
| JP2003035730A (en) * | 2001-07-24 | 2003-02-07 | Setto Engineering:Kk | Current detector |
| JP2006017470A (en) * | 2004-06-30 | 2006-01-19 | Tdk Corp | Electric current detecting circuit |
| EP3644328A1 (en) | 2018-10-26 | 2020-04-29 | Sumida Corporation | Coil wire, current sensor component, and current sensor |
-
1986
- 1986-09-02 JP JP61206171A patent/JPS6361961A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02259471A (en) * | 1989-03-30 | 1990-10-22 | Tokin Corp | Current detector |
| JP2003035730A (en) * | 2001-07-24 | 2003-02-07 | Setto Engineering:Kk | Current detector |
| JP2006017470A (en) * | 2004-06-30 | 2006-01-19 | Tdk Corp | Electric current detecting circuit |
| JP4501555B2 (en) * | 2004-06-30 | 2010-07-14 | Ｔｄｋ株式会社 | Current detection circuit |
| EP3644328A1 (en) | 2018-10-26 | 2020-04-29 | Sumida Corporation | Coil wire, current sensor component, and current sensor |
| US11506690B2 (en) | 2018-10-26 | 2022-11-22 | Sumida Corporation | Coil wire, current sensor component, and current sensor |
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