JP2993529B2 - Current measuring device - Google Patents
Current measuring deviceInfo
- Publication number
- JP2993529B2 JP2993529B2 JP3129886A JP12988691A JP2993529B2 JP 2993529 B2 JP2993529 B2 JP 2993529B2 JP 3129886 A JP3129886 A JP 3129886A JP 12988691 A JP12988691 A JP 12988691A JP 2993529 B2 JP2993529 B2 JP 2993529B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- magnetic flux
- bias
- coil
- secondary coil
- 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.)
- Expired - Fee Related
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は測定線（母線や充電線）
を切断しないで、測定線を流れる電流を測定することが
できる電流測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring line (bus line or charging line).
The present invention relates to a current measuring device that can measure a current flowing through a measurement line without cutting the current.
【０００２】[0002]
【従来の技術】センサ技術１９８９年７月号（４８頁
〜）には、図５に示すように、計測電流１００により生
じる磁束をホール素子２００で検出し、オペアンプ３０
０により磁束を打ち消す磁束を発生させる二次電流を二
次コイル４００に流し、抵抗５００の両端の電圧から計
測電流１００を求めるという電流測定装置Ｃが記載され
ている。2. Description of the Related Art As shown in FIG. 5, a magnetic field generated by a measurement current 100 is detected by a Hall element 200, and an operational amplifier 30 is disclosed.
A current measuring device C is described in which a secondary current that generates a magnetic flux that cancels a magnetic flux by zero flows through a secondary coil 400, and a measured current 100 is obtained from a voltage across a resistor 500.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の電流測定装置は、正逆両方向の電流測定のために±
両電源を必要とし、不便であるという課題を有する。本
発明の目的は、単電源で動作し、充電線の放電電流およ
び充放電電流を効率良く測定することのできる電流測定
装置の提供にある。However, the above-mentioned conventional current measuring device is not suitable for measuring current in both forward and reverse directions.
There is a problem that both power sources are required, which is inconvenient. An object of the present invention is to provide a current measuring device that operates with a single power supply and can efficiently measure a discharge current and a charge / discharge current of a charge line.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、以下の構成を採用した。 （１）ギャップを設けるとともに、母線電流が流れる母
線を包囲するコアと、前記ギャップに配され、前記コア
中に生じる磁束に応じた電気出力を発生する磁気センサ
と、前記コアに巻かれる、二次コイルおよびバイアスコ
イルと、前記二次コイルまたは両コイルに平衡電流を流
すことにより、前記コア中に生じる磁束を打ち消す磁気
平衡制御回路と、母線電流が正方向時に発生する磁束と
同向きの磁束が前記コア中に生じるように前記バイアス
コイルにバイアス電流を流し、母線電流が正逆両方向時
に生じる磁束を前記二次コイルにて打ち消す正逆両方向
電流測定モードと、前記バイアスコイルが前記二次コイ
ルと同一向きの磁束を発生するように前記バイアスコイ
ルにバイアス電流を流し、母線電流の正方向時に生じる
磁束を前記二次コイルおよびバイアスコイルにて打ち消
す正方向電流測定モードとを有し、何方かのモードが選
択できる切替回路とを具備し、前記平衡電流の大きさに
基づいて前記母線電流を求める。In order to solve the above problems, the present invention employs the following constitution. (1) A core provided with a gap and surrounding a bus through which a bus current flows, a magnetic sensor arranged in the gap to generate an electric output according to a magnetic flux generated in the core, and a core wound around the core. A magnetic balance control circuit for canceling magnetic flux generated in the core by flowing a balanced current through the secondary coil and bias coil, the secondary coil or both coils, and a magnetic flux in the same direction as the magnetic flux generated when the bus current is in the forward direction A forward / reverse bidirectional current measurement mode in which a bias current is applied to the bias coil so that the magnetic flux is generated in the forward and reverse directions so that the magnetic flux generated in the forward and reverse directions is canceled by the secondary coil. A bias current is supplied to the bias coil so as to generate a magnetic flux in the same direction as that of the secondary coil. And a forward current measurement mode cancel at Le and bias coils, what people of modes includes a switching circuit that can be selected, determining the bus current based on the magnitude of the equilibrium current.
【０００５】（２）ギャップを設けるとともに、充電線
電流が流れる充電線を包囲するコアと、前記ギャップに
配され、前記コア中に生じる磁束に応じた電気出力を発
生する磁気センサと、前記コアに巻かれる、二次コイル
およびバイアスコイルと、前記二次コイルまたは両コイ
ルに平衡電流を流すことにより、前記コア中に生じる磁
束を打ち消す磁気平衡制御回路と、充電線電流が正方向
時に発生する磁束と同向きの磁束が前記コア中に生じる
ように前記バイアスコイルにバイアス電流を流し、充電
線電流が充電放電時に生じる磁束を前記二次コイルにて
打ち消す充放電電流測定モードと、前記バイアスコイル
が前記二次コイルと同一向きの磁束を発生するように前
記バイアスコイルにバイアス電流を流し、充電線電流の
正方向時に生じる磁束を前記二次コイルおよびバイアス
コイルにて打ち消す放電電流測定モードとを有し、スタ
ータ始動時に前記放電電流測定モードを選択し、エンジ
ン始動後には前記充放電電流測定モードを選択する切替
回路とを具備し、前記平衡電流の大きさに基づいて前記
充電線電流を求める。(2) A core provided with a gap and surrounding a charging line through which a charging line current flows, a magnetic sensor arranged in the gap and generating an electric output in accordance with a magnetic flux generated in the core, A secondary coil and a bias coil, a magnetic balance control circuit for canceling magnetic flux generated in the core by flowing a balanced current to the secondary coil or both coils, and a charging line current is generated when the charging line current is in the forward direction. A charge / discharge current measurement mode in which a bias current is supplied to the bias coil so that a magnetic flux in the same direction as the magnetic flux is generated in the core, and a charging line current cancels the magnetic flux generated during charging / discharging by the secondary coil; Causes a bias current to flow in the bias coil so as to generate a magnetic flux in the same direction as the secondary coil, and occurs when the charging line current is in the positive direction. A discharge current measurement mode for canceling the bundle with the secondary coil and the bias coil, a switching circuit for selecting the discharge current measurement mode at starter start, and selecting the charge / discharge current measurement mode after engine start. And determining the charging line current based on the magnitude of the equilibrium current.
【０００６】[0006]
｛請求項１の作用｝正逆両方向電流測定モードの場合、
バイアスコイルにはバイアス電流が流される。母線電流
とバイアス電流とによりコアに磁束が発生する。磁気セ
ンサには磁束に応じた電気出力が発生する。磁気平衡制
御回路は、磁束を打ち消す強度の磁束を発生させる平衡
電流を二次コイルに流す。（平衡電流−母線電流ゼロの
時の平衡電流）×二次コイルの巻数、により充電線電流
の大きさが求められる。正方向電流測定モードの場合、
母線電流によりコアに磁束が発生する。磁気センサには
磁束に応じた電気出力が発生する。磁気平衡制御回路
は、平衡電流を二次コイル、バイアスコイルに分流して
流し、上記磁束を打ち消す。（二次コイルを流れる分流
平衡電流×二次コイルの巻数）＋（バイアスコイルを流
れる分流平衡電流×バイアスコイルの巻数）、により母
線電流の大きさが求められる。 ｛請求項１の効果｝母線電流が正方向にしか流れないこ
とが明らかな場合、切替回路を正方向電流測定モードに
すれば、正方向の母線電流が測定できる。なお、この正
方向電流測定モードの際、二次コイルとバイアスコイル
とが並列的に接続されるので合成コイルの直流抵抗が下
がり、大きな放電電流の測定に有利である。母線電流が
正方向、逆方向に流れる可能性がある場合、切替回路を
正逆両方向電流測定モードにすることにより、正逆両方
向の母線電流が測定できる。何方のモードも単電源で動
作させることができる。<< Function of Claim 1 >> In the case of the bidirectional current measurement mode,
A bias current flows through the bias coil. Magnetic flux is generated in the core by the bus current and the bias current. An electric output corresponding to the magnetic flux is generated in the magnetic sensor. The magnetic balance control circuit supplies a balanced current for generating a magnetic flux having a strength to cancel the magnetic flux to the secondary coil. The magnitude of the charging line current is determined by (balanced current−balanced current when bus current is zero) × the number of turns of the secondary coil. For forward current measurement mode,
A magnetic flux is generated in the core by the bus current. An electric output corresponding to the magnetic flux is generated in the magnetic sensor. The magnetic balance control circuit divides the balance current into the secondary coil and the bias coil to flow, thereby canceling the magnetic flux. The magnitude of the bus current is determined by ((the divided current flowing in the secondary coil) × (the number of turns of the secondary coil) + (the divided current flowing in the bias coil × the number of turns of the bias coil). << Effect of Claim 1 >> When it is clear that the bus current flows only in the positive direction, the bus current in the positive direction can be measured by setting the switching circuit to the positive current measurement mode. In the forward current measurement mode, the secondary coil and the bias coil are connected in parallel, so that the DC resistance of the combined coil is reduced, which is advantageous for measuring a large discharge current. When there is a possibility that the bus current may flow in the forward and reverse directions, the switching circuit is set to the forward and reverse bidirectional current measurement mode, so that the bus current in both the forward and reverse directions can be measured. Both modes can be operated with a single power supply.
【０００７】｛請求項２の作用｝充放電電流測定モード
の場合、バイアスコイルにはバイアス電流が流される。
充電線電流とバイアス電流とによりコアに磁束が発生す
る。磁気センサには磁束に応じた電気出力が発生する。
磁気平衡制御回路は、磁束を打ち消す強度の磁束を発生
させる平衡電流を二次コイルに流す。（平衡電流−充電
線電流ゼロの時の平衡電流）×二次コイルの巻数、によ
り充電線電流の大きさが求められる。放電電流測定モー
ドの場合、充電線電流によりコアに磁束が発生する。磁
気センサには磁束に応じた電気出力が発生する。磁気平
衡制御回路は、平衡電流を二次コイル、バイアスコイル
に分流して流し、上記磁束を打ち消す。（二次コイルを
流れる分流平衡電流×二次コイルの巻数）＋（バイアス
コイルを流れる分流平衡電流×バイアスコイルの巻
数）、により充電線電流の大きさが求められる。 ｛請求項２の効果｝充放電電流が正方向にしか流れな
い、スタータ始動時の場合、切替回路が放電電流測定モ
ードを選択し、正方向の放電電流が測定できる。なお、
この場合、二次コイルとバイアスコイルとが並列的に接
続されるので合成コイルの直流抵抗が下がり、大きな放
電電流の測定に有利である。充電線に充放電電流が流れ
る可能性が有る、エンジン始動後には、切替回路が充放
電電流測定モードを選択し、正逆方向の充放電電流が測
定できる。何方のモードも単電源で動作させることがで
きる。In the charge / discharge current measurement mode, a bias current flows through the bias coil.
Magnetic flux is generated in the core by the charging line current and the bias current. An electric output corresponding to the magnetic flux is generated in the magnetic sensor.
The magnetic balance control circuit supplies a balanced current for generating a magnetic flux having a strength to cancel the magnetic flux to the secondary coil. The magnitude of the charging line current is determined by (balanced current−balanced current when charging line current is zero) × the number of turns of the secondary coil. In the discharge current measurement mode, a magnetic flux is generated in the core by the charging line current. An electric output corresponding to the magnetic flux is generated in the magnetic sensor. The magnetic balance control circuit divides the balance current into the secondary coil and the bias coil to flow, thereby canceling the magnetic flux. The magnitude of the charging line current is determined by ((the divided current flowing through the secondary coil) × (the number of turns of the secondary coil) + (the divided current flowing through the bias coil × the number of turns of the bias coil)). << Effect of Claim 2 >> When the charge / discharge current flows only in the positive direction and the starter is started, the switching circuit selects the discharge current measurement mode, and the positive direction discharge current can be measured. In addition,
In this case, since the secondary coil and the bias coil are connected in parallel, the DC resistance of the combined coil is reduced, which is advantageous for measuring a large discharge current. After the start of the engine, in which the charging / discharging current may flow through the charging line, the switching circuit selects the charging / discharging current measurement mode, and can measure the charging / discharging current in the forward and reverse directions. Both modes can be operated with a single power supply.
【０００８】[0008]
【実施例】本発明の一実施例を図１〜図４に基づいて説
明する。充電線電流測定装置Ａは、図１および図２に示
す如く、ギャップ１１を設けるとともに、車載バッテリ
Ｂの充電線２を挿通させたコア１と、コア１に巻かれる
二次コイル３およびバイアスコイル４と、ギャップ１１
に配されるホール素子５と、充放電電流測定モードと放
電電流測定モードとを有する切替回路６と、コア１中に
生じる磁束を打ち消す磁気平衡制御回路７とを具備して
なる。また、この充電線電流測定装置Ａは、エンジン６
００、エンジン６００により駆動されるオルタネータ６
１０、スタータ６２０、エンジン６００のアイドル回転
数を制御するアイドルスピードコントローラ６３０、車
両負荷６４０、６５０、電子制御装置６６０、イグニッ
ションスイッチ６７０で構成されるバッテリ容量保全シ
ステムＨに組み込まれる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the charging line current measuring device A is provided with a gap 11, a core 1 through which a charging line 2 of a vehicle-mounted battery B is inserted, a secondary coil 3 wound around the core 1, and a bias coil. 4 and gap 11
, A switching circuit 6 having a charge / discharge current measurement mode and a discharge current measurement mode, and a magnetic balance control circuit 7 for canceling a magnetic flux generated in the core 1. Further, this charging line current measuring device A
00, alternator 6 driven by engine 600
10, a starter 620, an idle speed controller 630 for controlling the idle speed of the engine 600, vehicle loads 640 and 650, an electronic control unit 660, and an ignition switch 670.
【０００９】コア１は、薄板状のパーマロイを積層して
なるＣ形鉄心である。充電線２は、車載バッテリＢのマ
イナス端子と車体とを電気接続するワイヤーであり、−
１００アンペア（充電時最大）〜３００アンペア（放電
時最大）の充電線電流２０が流れる。The core 1 is a C-shaped iron core formed by laminating thin plate-shaped permalloys. The charging line 2 is a wire for electrically connecting the minus terminal of the vehicle-mounted battery B to the vehicle body.
A charging line current 20 of 100 amps (maximum during charging) to 300 amps (maximum during discharging) flows.
【００１０】二次コイル３（直流抵抗約１０オーム）
は、コア１に、断面積０．３ｍｍ2 のエナメル被覆銅線
を１０００回巻いて形成される。この二次コイル３は、
二次コイル３に、電流をａ→ｂに流した時にコア１中に
発生する磁束の向きがφA になる向きに巻かれている。
バイアスコイル４（直│抵抗約２０オーム）は、コア１
に、断面積０．２ｍｍ 2 のエナメル被覆銅線を１０００
回巻いて形成される。このバイアスコイル４は、バイア
スコイル４に、電流をｃ→ｄに流した時にコア１中に発
生する磁束の向きがφB になる向きに巻かれている。[0010] Secondary coil 3 (DC resistance about 10 ohm)
Has a core 1 with a cross section of 0.3 mmTwoEnamelled copper wire
Is wound 1000 times. This secondary coil 3
When a current is passed through the secondary coil 3 from a to b,
The direction of the generated magnetic flux is φAIt is wound in the direction to become.
The bias coil 4 (direct | resistance about 20 ohms)
0.2 mm cross section Two1000 wire enameled copper wire
It is formed by winding. This bias coil 4 is
When current flows through the coil 4 from c to d, it is emitted into the core 1.
The direction of the generated magnetic flux is φBIt is wound in the direction to become.
【００１１】ホール素子５は、Ｇｅ、ＩｎＡｓ、ＩｎＳ
ｂ等の半導体に拠るホール発電器であり、コア１内に生
じる磁束に応じた電気出力を発生する。The Hall element 5 is made of Ge, InAs, InS
A Hall power generator based on a semiconductor such as b, and generates an electric output corresponding to the magnetic flux generated in the core 1.
【００１２】切替回路６は、バイアス電流発生ブロック
６０を構成する、演算増幅器６１、分圧抵抗６２、６
３、および電流検出抵抗６４と、トランジスタ６５〜６
９、トランジスタ６ａ〜６ｃ、インバータ６ｄ、抵抗６
ｅ〜６ｏとを図示の如く結線して形成されている。The switching circuit 6 comprises an operational amplifier 61 and voltage dividing resistors 62 and 6 which constitute a bias current generating block 60.
3, the current detection resistor 64, and the transistors 65 to 6
9, transistors 6a to 6c, inverter 6d, resistor 6
e to 6o are connected as shown in the figure.
【００１３】磁気平衡制御回路７は、演算増幅器７１、
および入力抵抗７２、７３で構成されている。The magnetic balance control circuit 7 includes an operational amplifier 71,
And input resistors 72 and 73.
【００１４】なお、８はコンデンサ８１、抵抗８２、ツ
ェナーダイオード等の定電圧素子８３で構成された定電
圧回路（出力電圧５．５ボルト）、３１は抵抗値１０オ
ームの高精度金属皮膜抵抗、ＳＷは端子ＧＮＤに接地す
ることにより切替回路６を充放電電流測定モードから放
電電流測定モードに切り換える端子である。Reference numeral 8 denotes a constant voltage circuit (output voltage 5.5 volts) composed of a constant voltage element 83 such as a capacitor 81, a resistor 82, and a Zener diode. 31 denotes a high-precision metal film resistor having a resistance value of 10 ohms. SW is a terminal for switching the switching circuit 6 from the charge / discharge current measurement mode to the discharge current measurement mode by grounding to the terminal GND.
【００１５】つぎに、充電線電流測定装置Ａの作動を含
むバッテリ容量保全システムＨの作動説明をする。 ｛スタータ始動時｝イグニッションスイッチ６７０が投
入される（固定接点６７１、６７２が可動接点に接続さ
れる）と、電子制御装置６６０および充電線電流測定装
置ＡのＩＧ端子にバッテリ電圧が印加される。電子制御
装置６６０は、端子ＳＷを端子ＧＮＤに接地する。トラ
ンジスタ６ｂ、６ｃがオフし、インバータ６ｄの出力が
ハイとなるので、トランジスタ６９、６ａはオンする。
よって、トランジスタ６５、６６はオフ、トランジスタ
６７、６８がオンとなり、バイアスコイル４が二次コイ
ル３と同一機能をするように結線される。スタータ６２
０が作動し、充電線２に充電線電流２０（脈流）が流れ
る。コア１の閉磁路内には充電線電流２０に拠る磁束が
発生し、磁気センサ５はこの磁束に応じた電気出力を発
生する。磁気平衡制御回路７は、上記磁束を打ち消すよ
うに、二次コイル３およびバイアスコイル４へ平衡電流
（Ｉ1 ＋Ｉ2 ）を流す。ここで、充電線電流２０をＩ、
二次コイル３、バイアスコイル４に流れる分流平衡電流
をＩ1 、Ｉ2 、二次コイル３、バイアスコイル４の巻数
をＮ1 、Ｎ2 とすれば、以下の式が成立する。 Ｉ〔Ａ〕×１〔ターン〕＝Ｉ1 〔Ａ〕×Ｎ1 〔ターン〕
＋Ｉ2 〔Ａ〕×Ｎ2 〔ターン〕 ここでＮ1 ＝Ｎ2 ＝１０００〔ターン〕であるので上式
は、以下のようになる。 Ｉ1 ＋Ｉ2 ＝Ｉ／１０００ よって、高精度金属皮膜抵抗３１の抵抗値をＲ（＝１０
オーム）とすると、端子ＯＵＴの電圧Ｖout は以下のよ
うになる。 Ｖout ＝（Ｉ×Ｒ）／１０００＝Ｉ／１００〔Ｖ〕 この場合、充電線電流２０は５０アンペア〜３００アン
ペアであるので、Ｖou t は０．５〜３〔Ｖ〕となる。電
子制御装置６６０は、検出した充電線電流２０やバッテ
リ電圧を演算し、走行前のバッテリ容量を算出する。Next, the operation of the battery capacity maintenance system H including the operation of the charging line current measuring device A will be described. {Starter Startup} When the ignition switch 670 is turned on (the fixed contacts 671 and 672 are connected to the movable contacts), the battery voltage is applied to the electronic control unit 660 and the IG terminal of the charging line current measuring device A. The electronic control unit 660 grounds the terminal SW to the terminal GND. The transistors 6b and 6c turn off and the output of the inverter 6d goes high, so that the transistors 69 and 6a turn on.
Therefore, the transistors 65 and 66 are turned off, the transistors 67 and 68 are turned on, and the bias coil 4 is connected so as to perform the same function as the secondary coil 3. Starter 62
0 operates, and a charging line current 20 (pulsating flow) flows through the charging line 2. A magnetic flux due to the charging line current 20 is generated in the closed magnetic path of the core 1, and the magnetic sensor 5 generates an electric output according to the magnetic flux. The magnetic balance control circuit 7 supplies a balanced current (I 1 + I 2 ) to the secondary coil 3 and the bias coil 4 so as to cancel the magnetic flux. Here, the charging line current 20 is I,
Assuming that the shunt balance currents flowing through the secondary coil 3 and the bias coil 4 are I 1 and I 2 , and the number of turns of the secondary coil 3 and the bias coil 4 is N 1 and N 2 , the following equation is established. I [A] × 1 [turn] = I 1 [A] × N 1 [turn]
+ I 2 [A] × N 2 [turns] Since N 1 = N 2 = 1000 [turns], the above equation is as follows. I 1 + I 2 = I / 1000 Therefore, the resistance value of the high-precision metal film resistor 31 is R (= 10
Ohm), the voltage Vout at the terminal OUT is as follows. V out = (I × R) / 1000 = I / 100 [V] In this case, since the charging line current 20 is 50 amps to 300 amps, V ou t becomes 0.5 to 3 [V]. The electronic control unit 660 calculates the detected charging line current 20 and the battery voltage to calculate the battery capacity before traveling.
【００１６】｛エンジン始動後｝スタータ６２０により
エンジン６００が始動し、オルタネータ６１０が発電を
開始する。電子制御装置６６０は端子ＳＷを開放する。
充電線電流２０はオルタネータ６１０に拠る充電電流と
車両負荷６４０、６５０に拠る消費電流との兼ね合いに
より正方向になったり逆方向になったりする。トランジ
スタ６ｂ、６ｃがオンし、インバータ６ｄの出力がロー
となるので、トランジスタ６９、６ａはオフする。よっ
て、トランジスタ６５、６６はオン、トランジスタ６
７、６８がオフとなり、バイアスコイル４にはバイアス
電流発生ブロック６０により所定電流が流される。ここ
で所定電流を１００〔ｍＡ〕とすれば、充電線電流２０
がゼロの時の端子ＯＵＴの電圧Ｖout は１〔Ｖ〕とな
り、図３に示すように充電線電流２０は−１００アンペ
ア（Ｖout ＝０ボルト）迄測定できる。電子制御装置６
６０は、検出した、充電線電流２０やバッテリ電圧を演
算し、エンジン始動後の車載バッテリＢの容量を算出す
る。{After Engine Start} Engine 600 is started by starter 620, and alternator 610 starts power generation. The electronic control unit 660 opens the terminal SW.
The charging line current 20 may be forward or reverse depending on the balance between the charging current due to the alternator 610 and the current consumption due to the vehicle loads 640 and 650. The transistors 6b and 6c turn on and the output of the inverter 6d goes low, so that the transistors 69 and 6a turn off. Therefore, the transistors 65 and 66 are turned on and the transistor 6 is turned on.
7 and 68 are turned off, and a predetermined current flows through the bias coil 4 by the bias current generation block 60. Here, if the predetermined current is 100 [mA], the charging line current 20
Is zero, the voltage Vout at the terminal OUT becomes 1 [V], and as shown in FIG. 3, the charging line current 20 can be measured up to -100 amps ( Vout = 0 volt). Electronic control unit 6
60 calculates the detected charging line current 20 and battery voltage, and calculates the capacity of the vehicle-mounted battery B after starting the engine.
【００１７】つぎに、スタータ始動時（放電電流測定モ
ード時）に、バイアスコイル４と二次コイル３とをパラ
レル接続することに拠る効果について述べる。スタータ
始動時に、充電線２に３００アンペア（＝Ｉ）の充電線
電流２０が流れると、図２に示すように、Ｖout は３
〔Ｖ〕となる。ここで、二次コイル３、バイアスコイル
４の直流抵抗をＲ1 （１０オーム）、Ｒ2 （２０オー
ム）とした場合、二次コイル３、バイアスコイル４に流
れる分流平衡電流Ｉ1 、Ｉ2 は以下のようにして求めら
れる。なお、簡略化のため、トランジスタ６７、６８の
ＶCEは０とする。 Ｉ1 ×Ｒ1 ＝Ｉ2 ×Ｒ2 、およびＩ1 ＋Ｉ2 ＝Ｉ／１０００ Ｉ1 ＝０．２〔Ａ〕；Ｉ2 ＝０．１〔Ａ〕 この時、演算増幅器７１の出力電圧Ｖは以下のように表
わされ、３００アンペアの様な大きな放電電流を充分測
定できる。 Ｖ＝Ｖout ＋Ｉ1 ×Ｒ1 ＝３＋０．２×１０ ＝５〔Ｖ〕 ところで、バイアスコイル４を開放し、二次コイル３だ
けで動作させた場合、平衡電流は全て二次コイル３に流
れるので演算増幅器７１の出力電圧Ｖは以下のようにな
る（但し定電圧回路８の電源電圧が充分高いと仮定す
る）。 Ｖ＝Ｖout ＋Ｉ1 ×Ｒ1 ＝３＋０．３×１０ ＝６〔Ｖ〕 しかし、スタータ始動時にバッテリ電圧の低下（６ボル
ト程度になる）が起きても、充電線電流測定装置Ａ等が
安定動作するように定電圧回路８の電源電圧が５．５Ｖ
に設定してあるため、上記式は成り立たず、３００アン
ペアの様な大電流は測定できない事となる。Next, the effect of connecting the bias coil 4 and the secondary coil 3 in parallel when starting the starter (during the discharge current measurement mode) will be described. When the starter start-up, when the charging line current 20 300 amperes charging line 2 (= I) flows, as shown in FIG. 2, V out is 3
[V]. Here, assuming that the DC resistances of the secondary coil 3 and the bias coil 4 are R 1 (10 ohms) and R 2 (20 ohms), the shunt balance currents I 1 , I 2 flowing through the secondary coil 3 and the bias coil 4 Is determined as follows. Note that V CE of the transistors 67 and 68 is set to 0 for simplification. I 1 × R 1 = I 2 × R 2 , and I 1 + I 2 = I / 1000 I 1 = 0.2 [A]; I 2 = 0.1 [A] At this time, the output voltage V of the operational amplifier 71 is Is expressed as follows, and a large discharge current such as 300 amperes can be sufficiently measured. V = V out + I 1 × R 1 = 3 + 0.2 × 10 = 5 [V] By the way, when the bias coil 4 is opened and operated only with the secondary coil 3, all the balanced current flows through the secondary coil 3. Therefore, the output voltage V of the operational amplifier 71 is as follows (provided that the power supply voltage of the constant voltage circuit 8 is sufficiently high). V = V out + I 1 × R 1 = 3 + 0.3 × 10 = 6 [V] However, even if the battery voltage drops (to about 6 volts) when the starter starts, the charging line current measuring device A and the like are stable. The power supply voltage of the constant voltage circuit 8 is set to 5.5 V to operate.
, The above equation does not hold, and a large current such as 300 amperes cannot be measured.
【００１８】なお、本実施例のように、コイルの効率的
な利用を行わず、二次コイル３の線径を太くしたり、Ｄ
Ｃ- ＤＣコンバータ（定電圧回路８の電源電圧を上げ
る）を使用して解決しようとすると、電流検出部の、体
格や重量の増大を招いたり、充電線電流測定装置Ａの大
型化を招く。It is to be noted that, as in this embodiment, the wire diameter of the secondary coil 3 is not increased,
Attempts to solve the problem by using a C-DC converter (increase the power supply voltage of the constant voltage circuit 8) cause an increase in the size and weight of the current detection unit and an increase in the size of the charging line current measurement device A.
【００１９】本発明は、上記実施例以外につぎの実施態
様を含む。 ａ．リレーを用いて切替回路を構成しても良い。 ｂ．二次コイル、バイアスコイルの線径や巻数は、充電
線電流の大きさに応じ、適宜決めれば良い。 ｃ．切替回路６のトランジスタはＭＯＳ形でも良い。The present invention includes the following embodiments in addition to the above embodiment. a. The switching circuit may be configured using a relay. b. The wire diameter and the number of turns of the secondary coil and the bias coil may be appropriately determined according to the magnitude of the charging wire current. c. The transistor of the switching circuit 6 may be a MOS type.
【図１】本発明の一実施例に係る充電線電流測定装置の
電気回路図である。FIG. 1 is an electric circuit diagram of a charging line current measuring device according to one embodiment of the present invention.
【図２】その装置のコア部分の説明図である。FIG. 2 is an explanatory view of a core portion of the device.
【図３】その装置における、充放電電流と電圧Ｖout と
の関係を示すグラフである。FIG. 3 is a graph showing a relationship between a charge / discharge current and a voltage V out in the device.
【図４】その充電線電流測定装置を組み込んだバッテリ
容量保全システムの説明図である。FIG. 4 is an explanatory diagram of a battery capacity maintenance system incorporating the charging line current measuring device.
【図５】従来の電流測定装置の説明図である。FIG. 5 is an explanatory diagram of a conventional current measuring device.
Ａ 充電線電流測定装置（電流測定装置） Ｂ 車載バッテリ １ コア ２ 充電線（母線） ３ 二次コイル ４ バイアスコイル ５ ホール素子（磁気センサ） ６ 切替回路 ７ 磁気平衡制御回路 １１ ギャップ ２０ 充電線電流（母線電流） A charging line current measuring device (current measuring device) B vehicle-mounted battery 1 core 2 charging line (bus) 3 secondary coil 4 bias coil 5 hall element (magnetic sensor) 6 switching circuit 7 magnetic balance control circuit 11 gap 20 charging line current (Bus current)
フロントページの続き (56)参考文献 特開 平４−198762（ＪＰ，Ａ) 特開 昭55−101057（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01R 19/00 - 19/32 G01R 15/00 - 15/26 Continuation of the front page (56) References JP-A-4-198762 (JP, A) JP-A-55-101057 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G01R 19 / 00-19/32 G01R 15/00-15/26
Claims (2)
流れる母線を包囲するコアと、前記ギャップに配され、
前記コア中に生じる磁束に応じた電気出力を発生する磁
気センサと、前記コアに巻かれる、二次コイルおよびバ
イアスコイルと、前記二次コイルまたは両コイルに平衡
電流を流すことにより、前記コア中に生じる磁束を打ち
消す磁気平衡制御回路と、母線電流が正方向時に発生す
る磁束と同向きの磁束が前記コア中に生じるように前記
バイアスコイルにバイアス電流を流し、母線電流が正逆
両方向時に生じる磁束を前記二次コイルにて打ち消す正
逆両方向電流測定モードと、前記バイアスコイルが前記
二次コイルと同一向きの磁束を発生するように前記バイ
アスコイルにバイアス電流を流し、母線電流の正方向時
に生じる磁束を前記二次コイルおよびバイアスコイルに
て打ち消す正方向電流測定モードとを有し、何方かのモ
ードが選択できる切替回路とを具備し、前記平衡電流の
大きさに基づいて前記母線電流を求める電流測定装置。1. A core is provided in a gap surrounding a bus bar through which a bus current flows while providing a gap;
A magnetic sensor that generates an electric output according to a magnetic flux generated in the core; a secondary coil and a bias coil wound around the core; and a balanced current flowing through the secondary coil or both coils, thereby causing A magnetic balance control circuit that cancels out the magnetic flux generated in the core coil, and a bias current is applied to the bias coil so that a magnetic flux in the same direction as the magnetic flux generated when the bus current is generated in the forward direction is generated. A forward / reverse bidirectional current measurement mode in which magnetic flux is canceled by the secondary coil, and a bias current is applied to the bias coil so that the bias coil generates a magnetic flux in the same direction as the secondary coil. A positive current measurement mode in which the generated magnetic flux is canceled by the secondary coil and the bias coil, and any one of the modes can be selected. Replacement includes the circuit, a current measuring device for determining the bus current based on the magnitude of the equilibrium current.
が流れる充電線を包囲するコアと、前記ギャップに配さ
れ、前記コア中に生じる磁束に応じた電気出力を発生す
る磁気センサと、前記コアに巻かれる、二次コイルおよ
びバイアスコイルと、前記二次コイルまたは両コイルに
平衡電流を流すことにより、前記コア中に生じる磁束を
打ち消す磁気平衡制御回路と、充電線電流が正方向時に
発生する磁束と同向きの磁束が前記コア中に生じるよう
に前記バイアスコイルにバイアス電流を流し、充電線電
流が充電放電時に生じる磁束を前記二次コイルにて打ち
消す充放電電流測定モードと、前記バイアスコイルが前
記二次コイルと同一向きの磁束を発生するように前記バ
イアスコイルにバイアス電流を流し、充電線電流の正方
向時に生じる磁束を前記二次コイルおよびバイアスコイ
ルにて打ち消す放電電流測定モードとを有し、スタータ
始動時に前記放電電流測定モードを選択し、エンジン始
動後には前記充放電電流測定モードを選択する切替回路
とを具備し、前記平衡電流の大きさに基づいて前記充電
線電流を求める電流測定装置。2. A core, which is provided with a gap and surrounds a charging line through which a charging line current flows, a magnetic sensor arranged in the gap and generating an electric output according to a magnetic flux generated in the core, A secondary coil and a bias coil to be wound, a magnetic balance control circuit for canceling a magnetic flux generated in the core by flowing a balanced current to the secondary coil or both coils, and a magnetic flux generated when the charging line current is in the forward direction. A charge / discharge current measurement mode in which a bias current is supplied to the bias coil so that magnetic flux in the same direction as in the core is generated in the core, and a charging line current cancels a magnetic flux generated at the time of charging / discharging by the secondary coil; A bias current is applied to the bias coil so as to generate a magnetic flux in the same direction as the secondary coil. A discharge current measurement mode for canceling with the secondary coil and the bias coil, a switching circuit for selecting the discharge current measurement mode at starter start, and selecting the charge / discharge current measurement mode after engine start. And a current measuring device for obtaining the charging line current based on the magnitude of the equilibrium current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3129886A JP2993529B2 (en) | 1991-05-31 | 1991-05-31 | Current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3129886A JP2993529B2 (en) | 1991-05-31 | 1991-05-31 | Current measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04353772A JPH04353772A (en) | 1992-12-08 |
| JP2993529B2 true JP2993529B2 (en) | 1999-12-20 |
Family
ID=15020776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3129886A Expired - Fee Related JP2993529B2 (en) | 1991-05-31 | 1991-05-31 | Current measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2993529B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012011306A1 (en) * | 2010-07-20 | 2012-01-26 | アルプス・グリーンデバイス株式会社 | Current sensor |
| JP2015087210A (en) * | 2013-10-30 | 2015-05-07 | 矢崎総業株式会社 | Current detector |
-
1991
- 1991-05-31 JP JP3129886A patent/JP2993529B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04353772A (en) | 1992-12-08 |
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