JP2020148752A - Current detection device - Google Patents
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Abstract
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この発明は、被測定電流が印加される連続するＵ字部と逆Ｕ字部を備えた一次導体と、前記一次導体の連続するＵ字部と逆Ｕ字部の面に近接し、且つＵ字部と逆Ｕ字部の略中心位置に、被測定電流により発生する磁束が印加されるように設置された少なくとも一対の磁電変換素子を備え、前記一対の磁電変換素子が前記一次導体の連続するＵ字部と逆Ｕ字部で発生する対向方向の磁束が印加されるように設置されているコアレスの電流検出装置に関するものである。 According to the present invention, a primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied is close to and U-shaped on the surfaces of the continuous U-shaped portion and the inverted U-shaped portion of the primary conductor. At least a pair of electromagnetic conversion elements installed so as to apply a magnetic flux generated by a current to be measured are provided at substantially center positions of a character portion and an inverted U-shaped portion, and the pair of electromagnetic conversion elements are continuous with the primary conductor. The present invention relates to a coreless current detection device installed so that magnetic fluxes in opposite directions generated in a U-shaped portion and an inverted U-shaped portion are applied.
従来、非接触で被測定電流を計測する手法としては、一般的に、磁気コアを用いたものがある。磁気コアを利用した電流検出装置は、磁気コアを被測定電流の流れる導体を取り囲む様に設置し、磁気コアに設けたギャップ部とともに磁気回路を形成する。ギャップ部に設置した磁電変換素子を通じて、被測定電流により磁気回路に生じた磁束の大きさを測定することで、非接触で被測定電流の大きさを測定する。 Conventionally, as a method of measuring the measured current without contact, there is generally a method using a magnetic core. In the current detection device using the magnetic core, the magnetic core is installed so as to surround the conductor through which the current to be measured flows, and a magnetic circuit is formed together with the gap portion provided in the magnetic core. By measuring the magnitude of the magnetic flux generated in the magnetic circuit by the measured current through the electromagnetic conversion element installed in the gap portion, the magnitude of the measured current is measured in a non-contact manner.
近年、小型化や軽量化、あるいは高精度化等を目的とし、特に大電流計測において磁気コアを用いないコアレスの電流検出装置が提案されている。コアレスの電流検出装置としては、一対の検出素子を、クランク状に２度直角に折り曲げた導体に配置したものがある（例えば、特許文献１参照）。 In recent years, a coreless current detection device that does not use a magnetic core has been proposed for the purpose of miniaturization, weight reduction, high accuracy, and the like, especially in large current measurement. As a coreless current detection device, there is a device in which a pair of detection elements are arranged on a conductor bent at a right angle twice in a crank shape (see, for example, Patent Document 1).
前記特許文献１に開示されている電流検出装置は、一対の検出素子を用いて、隣り合う他の導体を流れる電流に起因して当該一対の検出素子に作用する磁界の強さが互いに同じになるように配置され、一対の検出素子の出力の差分を用いることで、検出対象以外の導体から発生した磁界に起因する検出精度の低下を回避している。また、一対の検出素子と少なくとも一つの導体との間において所定方向の位置ずれが発生したときでも、位置ずれが発生していないときと同様の検出精度を確保することができる。
しかしながら、一対の検出素子と少なくとも一つの導体との位置ずれは所定方向に限定されないため検出誤差が発生するという問題点があった。The current detection device disclosed in
However, there is a problem that a detection error occurs because the positional deviation between the pair of detection elements and at least one conductor is not limited to a predetermined direction.
また、導体をクランク状に加工することから、導体入力のプラス側（入口）とマイナス側（出口）が同一線上にないため小型化に向かないという問題点があった。 Further, since the conductor is processed into a crank shape, there is a problem that it is not suitable for miniaturization because the plus side (inlet) and the minus side (exit) of the conductor input are not on the same line.
また、多相に配置する場合、それぞれの導体に設置されるそれぞれの一対の検出素子を同一基板上に設置する場合、電流検出装置のみならず基板も大型化し、低コスト化に向かないという問題点があった。 Further, in the case of arranging in multiple phases, when each pair of detection elements installed in each conductor is installed on the same substrate, not only the current detection device but also the substrate becomes large, which is not suitable for cost reduction. There was a point.
この発明は上記のような課題を鑑み、解決するためになされたもので、一対の磁電変換素子と一次導体との位置ずれによる検出精度への影響を低減し、且つ小型で、低コストの電流検出装置を得ることを目的とする。 The present invention has been made in view of the above problems and has been made to solve the problem. It reduces the influence of the misalignment between the pair of magnetron conversion elements and the primary conductor on the detection accuracy, and is small and low cost. The purpose is to obtain a detector.
この発明に係わる電流検出装置は、少なくとも一つの電流密度が均一な連続するＵ字部と逆Ｕ字部を有する一次導体を備えたものである。 The current detection device according to the present invention includes at least one primary conductor having a continuous U-shaped portion and an inverted U-shaped portion having a uniform current density.
また、この発明に係わる電流検出装置は、少なくとも一つの電流密度が均一な連続するＵ字部と逆Ｕ字部と直線部を備えたものである。 Further, the current detection device according to the present invention includes at least one continuous U-shaped portion, an inverted U-shaped portion, and a straight portion having a uniform current density.
また、この発明に係わる電流検出装置は、前記連続するＵ字部と逆Ｕ字部の結合部の中心に対して点対称に配置されるものである。 Further, the current detection device according to the present invention is arranged point-symmetrically with respect to the center of the joint portion between the continuous U-shaped portion and the inverted U-shaped portion.
また、この発明に係わる電流検出装置は、前記一次導体の連続するＵ字部と逆Ｕ字部の面に近接し、且つＵ字部と逆Ｕ字部の略中心線のそれぞれの位置であり、被測定電流により発生する磁束が印加されるように設置された少なくとも一対の磁電変換素子とを備え、前記一対の磁電変換素子が前記一次導体の連続するＵ字部と逆Ｕ字部で発生する対向方向の磁束が印加されるように設置したものである。 Further, the current detection device according to the present invention is close to the surfaces of the continuous U-shaped portion and the inverted U-shaped portion of the primary conductor, and is located at each position of the substantially center line of the U-shaped portion and the inverted U-shaped portion. , At least a pair of electromagnetic conversion elements installed so as to apply a magnetic flux generated by a current to be measured, and the pair of electromagnetic conversion elements are generated in a continuous U-shaped portion and an inverted U-shaped portion of the primary conductor. It is installed so that the magnetic flux in the opposite direction is applied.
また、この発明に係わる電流検出装置は、前記一対の磁電変換素子の感磁面が同一平面上に設置したものである。 Further, in the current detection device according to the present invention, the magnetically sensitive surfaces of the pair of magnetron conversion elements are installed on the same plane.
また、この発明に係わる電流検出装置は、前記一対の磁電変換素子を、一つの基材に設置したものである。 Further, in the current detection device according to the present invention, the pair of magnetron conversion elements are installed on one base material.
また、この発明に係わる電流検出装置は、前記一対の磁電変換素子が略同一の感度を有したものである。 Further, in the current detection device according to the present invention, the pair of magnetron conversion elements have substantially the same sensitivity.
以上のように、この発明によれば、前記一次導体に設置される前記の少なくとも一つの電流密度が均一な連続するＵ字部と逆Ｕ字部で構成され、前記連続するＵ字部と逆Ｕ字部の結合部の中心に対して点対称に配置され、前記一次導体の連続するＵ字部と逆Ｕ字部の面に近接し、且つＵ字部と逆Ｕ字部の略中心線のそれぞれの位置であり、被測定電流により発生する磁束が印加されるように設置された少なくとも一対の磁電変換素子とを備え、前記一対の磁電変換素子が前記一次導体の連続するＵ字部と逆Ｕ字部で発生する対向方向の磁束が印加されることにより、前記一対の磁電変換素子の感磁方向と面外方向の磁束が減衰する効果がある。 As described above, according to the present invention, at least one of the continuous U-shaped portions installed on the primary conductor and the inverted U-shaped portion having a uniform current density are formed, which is opposite to the continuous U-shaped portion. It is arranged point-symmetrically with respect to the center of the joint portion of the U-shaped portion, is close to the surfaces of the continuous U-shaped portion and the inverted U-shaped portion of the primary conductor, and is approximately the center line of the U-shaped portion and the inverted U-shaped portion. At each position of, at least a pair of electromagnetic conversion elements installed so as to apply a magnetic flux generated by a current to be measured, and the pair of electromagnetic conversion elements are connected to a continuous U-shaped portion of the primary conductor. By applying the magnetic current in the opposite direction generated in the inverted U-shaped portion, there is an effect that the magnetic flux in the magnetic sensing direction and the out-of-plane direction of the pair of electromagnetic conversion elements is attenuated.
また、前記面外方向の磁束が減衰することにより、前記一対の磁電変換素子と前記の一次導体の位置ずれにより混入する前記一対の磁電変換素子の感磁方向と面外方向の磁束の影響が低減し、検出誤差を低減する効果がある。 Further, as the magnetic flux in the out-of-plane direction is attenuated, the influence of the magnetic fluxes in the magnetic sensing direction and the out-of-plane direction of the pair of electromagnetic conversion elements mixed due to the positional deviation between the pair of electromagnetic conversion elements and the primary conductor is exerted. It has the effect of reducing and reducing the detection error.
また、前記一対の磁電変換素子のそれぞれが対向方向の磁束を検出することにより、外部から混入する磁束の影響を低減し、検出誤差を低減する効果がある。 Further, by detecting the magnetic flux in the opposite direction by each of the pair of magnetron conversion elements, there is an effect of reducing the influence of the magnetic flux mixed from the outside and reducing the detection error.
また、前記一対の磁電変換素子のそれぞれが略同一の感度を有することにより、前述の一対の磁電変換素子と一次導体の位置ずれにより混入する一対の磁電変換素子の感磁方向と面外方向の磁束の影響と、外部から混入する磁束の影響を低減し、検出誤差を低減する効果は最大となる。 Further, since each of the pair of magnetic conversion elements has substantially the same sensitivity, the pair of magnetic conversion elements and the pair of magnetic conversion elements mixed due to the positional deviation of the primary conductor are in the magnetic flux direction and the out-of-plane direction. The effect of reducing the influence of magnetic flux and the influence of magnetic flux mixed from the outside and reducing the detection error is maximized.
また、前記の少なくとも一つの電流密度が均一な連続するＵ字部と逆Ｕ字部に直線部を備えることにより、導体入力のプラス側（入口）とマイナス側（出口）が同一線上になるため電流検出装置の寸法が拡大することなく、小型化の効果がある。Further, by providing a straight portion in the continuous U-shaped portion and the inverted U-shaped portion having a uniform current density at least one of the above, the positive side (inlet) and the negative side (outlet) of the conductor input are on the same line. There is an effect of miniaturization without enlarging the dimensions of the current detector.
また、前記電流検出装置を多相に配置し、それぞれの導体に設置されるそれぞれの一対の磁電変換素子を同一基板上に設置する場合、電流検出装置のみならず基板もの寸法が拡大することなく、小型化、さらには低コスト化の効果がある。 Further, when the current detection device is arranged in multiple phases and each pair of magnetron conversion elements installed on each conductor is installed on the same substrate, the dimensions of not only the current detection device but also the substrate do not increase. It has the effect of miniaturization and cost reduction.
また、前記面外方向の磁束が減衰することにより、前記一対の磁電変換素子と前記の一次導体の位置ずれにより混入する前記一対の磁電変換素子の感磁方向と面外方向の磁束の影響が低減し、検出誤差を低減する効果を有するため、前記電流検出装置を組み立てる際に位置調整する手間が省けることから、低コスト化の効果がある。 Further, as the magnetic flux in the out-of-plane direction is attenuated, the influence of the magnetic fluxes in the magnetic sensing direction and the out-of-plane direction of the pair of electromagnetic conversion elements mixed due to the positional deviation between the pair of electromagnetic conversion elements and the primary conductor is exerted. Since it has the effect of reducing and reducing the detection error, it is possible to save the trouble of adjusting the position when assembling the current detection device, and thus there is an effect of cost reduction.
次に、本発明の実施形態に係る電流検出装置について図面を参照して説明する。
なお、以下に記載される実施形態は、本発明を説明するための例示であり、本発明をこれらの実施形態にのみ限定するものではない。したがって、本発明は、その要旨逸脱しない限り、様々な形態で実施することができる。Next, the current detection device according to the embodiment of the present invention will be described with reference to the drawings.
The embodiments described below are examples for explaining the present invention, and the present invention is not limited to these embodiments. Therefore, the present invention can be implemented in various forms as long as it does not deviate from the gist thereof.
（実施の形態１）
図１は、この発明の実施の形態１による電流検出装置（１）の斜視図を示すもので、図２は電流検出装置（１）の平面図（ＸＹ面）、図３は図２における破線部の拡大図（ＸＹ面）、図４は図３における一対の磁電変換素子（７ａ）、（７ｂ）と、比較するために測定点（１４）のＹ方向の磁束密度を示したものである。図５は、特許文献１に記載の電流検出装置を例示したものである。図６は、図３に示す一対の磁電変換素子（７ａ）、（７ｂ）と図５に示す一対の検出素子（１７ａ）、（１７ｂ）のそれぞれの感磁方向であるＺ方向と面外方向であるＸ方向の磁束密度を示す表である。なお、前記各図では、説明を判り易くするため、各部材の厚さやサイズ、拡大・縮小率等は、実際のものとは一致させずに記載した。(Embodiment 1)
FIG. 1 shows a perspective view of the current detection device (1) according to the first embodiment of the present invention, FIG. 2 is a plan view (XY plane) of the current detection device (1), and FIG. 3 is a broken line in FIG. An enlarged view (XY plane) of the part, FIG. 4 shows the magnetic flux density in the Y direction of the measurement point (14) for comparison with the pair of magnetic electric conversion elements (7a) and (7b) in FIG. .. FIG. 5 illustrates the current detection device described in
実施形態１に係る電流検出装置（１）は、被測定電流が印加される一次導体（２）に設置されるＵ字部（３）と逆Ｕ字部（４）と一対の磁電変換素子（７ａ）、（７ｂ）と、これを設置する基材（８）で構成されている。なお、基材（８）は一対の磁電変換素子（７ａ）、（７ｂ）に供給する電源や感度の極性を制御し、また、感度を調整する回路部（１５）を備える。 The current detection device (1) according to the first embodiment has a U-shaped portion (3), an inverted U-shaped portion (4), and a pair of magnetron conversion elements (4) installed on a primary conductor (2) to which a current to be measured is applied. It is composed of 7a), (7b) and a base material (8) on which it is installed. The base material (8) includes a circuit unit (15) that controls the polarity of the power supply and sensitivity supplied to the pair of magnetron conversion elements (7a) and (7b) and also adjusts the sensitivity.
図１に示す一次導体（２）は、少なくとも一つの連続するＵ字部（３）と逆Ｕ字部（４）と直線部（１０）を備える。 The primary conductor (2) shown in FIG. 1 includes at least one continuous U-shaped portion (3), an inverted U-shaped portion (4), and a straight portion (10).
また、図１に示す一次導体（２）は、軟銅材により形成される。また、一次導体（２）に設置されるＵ字部（３）及び逆Ｕ字部（４）と直線部（１０）は、一次導体（２）と同様の軟銅材により形成されており、プレス加工等により曲げ加工されている。また、Ｕ字部（３）及び逆Ｕ字部（４）と直線部（１０）を含めた一次導体（２）は、軟銅材のシートメタルから打ち抜かれて形成されてもよい。また、Ｕ字部（３）および逆Ｕ字部（４）は別々に曲げ加工され、それぞれを溶接することで一次導体（２）を形成してもよい。 The primary conductor (2) shown in FIG. 1 is made of annealed copper material. Further, the U-shaped portion (3), the inverted U-shaped portion (4) and the straight portion (10) installed on the primary conductor (2) are formed of the same annealed copper material as the primary conductor (2), and are pressed. It is bent by processing. Further, the primary conductor (2) including the U-shaped portion (3), the inverted U-shaped portion (4) and the straight portion (10) may be formed by punching from the sheet metal of the annealed copper material. Further, the U-shaped portion (3) and the inverted U-shaped portion (4) may be bent separately and welded to each other to form the primary conductor (2).
また、一次導体２は、Ｕ字部（３）及び逆Ｕ字部（４）を含まない部分が直線に構成されており、導体入力のプラス側（入口）（１９）とマイナス側（出口）（２０）が
同一線上にあるため、電流検出装置（１）の寸法が拡大することなく、小型化の効果がある。Further, the
また、Ｕ字部（３）と逆Ｕ字部（４）は、一次導体（２）に設置され、前記一次導体（２）の連続するＵ字部（３）と逆Ｕ字部（４）の面に近接し、且つＵ字部（３）と逆Ｕ字部（４）の略中心線（５）及び（６）のそれぞれに一致する位置に一対の磁電変換素子（７ａ）、（７ｂ）を備えており、磁電変換素子（７ａ）、（７ｂ）はホール素子や磁気抵抗効果素子で構成される。 Further, the U-shaped portion (3) and the inverted U-shaped portion (4) are installed on the primary conductor (2), and the continuous U-shaped portion (3) and the inverted U-shaped portion (4) of the primary conductor (2) are provided. A pair of magnetoelectric conversion elements (7a) and (7b) are located close to the surface of the U-shaped portion (3) and at positions corresponding to the substantially center lines (5) and (6) of the U-shaped portion (3) and the inverted U-shaped portion (4). ), And the magnetoelectric conversion elements (7a) and (7b) are composed of a Hall element and a magnetoresistive effect element.
一対の磁電変換素子（７ａ）、（７ｂ）は、感磁面が同一平面となるように基材（８）に設置されており、基材（８）はガラスエポキシ材で形成されるプリント配線基板や半導体ＩＣを形成するシリコン基材で構成される。 The pair of magnetron conversion elements (7a) and (7b) are installed on the base material (8) so that the magnetically sensitive surfaces are flush with each other, and the base material (8) is a printed wiring made of a glass epoxy material. It is composed of a silicon base material that forms a substrate or a semiconductor IC.
図２に示す一次導体（２）には、Ｕ字部（３）と逆Ｕ字部（４）が備えられ、電流検出装置（１）に備えられる一対の磁電変換素子（７ａ）、（７ｂ）は、前記Ｕ字部（３）と逆Ｕ字部（４）の略中心線（５）及び（６）のそれぞれに一致する位置に配置され、且つ前記Ｕ字部（３）と逆Ｕ字部（４）の結合部の中心（１３）に対して点対称に配置されることで、一対の磁電変換素子（７ａ）、（７ｂ）にはそれぞれＵ字部（３）と逆Ｕ字部（４）で発生するＺ方向の互いに対向方向の磁束が印加される。 The primary conductor (2) shown in FIG. 2 is provided with a U-shaped portion (3) and an inverted U-shaped portion (4), and is provided with a pair of electromagnetic conversion elements (7a) and (7b) provided in the current detection device (1). ) Is arranged at a position corresponding to each of the substantially center lines (5) and (6) of the U-shaped portion (3) and the inverted U-shaped portion (4), and the U-shaped portion (3) and the inverted U By being arranged point-symmetrically with respect to the center (13) of the coupling portion of the character portion (4), the pair of electromagnetic conversion elements (7a) and (7b) have a U-shaped portion (3) and an inverted U-shape, respectively. The magnetic currents generated in the part (4) in the Z directions opposite to each other are applied.
図３に示す電流検出装置（１）は、図２の破線部を拡大した平面図（ＸＹ面）である。
図３のＵ字部（３）及び逆Ｕ字部（４）を構成するＵ字部の辺及び逆Ｕ字部の辺（１１ａ）、（１１ｂ）、（１１ｃ）、（１２ａ）、（１２ｂ）（１２ｃ）は電流密度が均一になるような導体幅や厚みで形成される。The current detection device (1) shown in FIG. 3 is an enlarged plan view (XY plane) of the broken line portion of FIG.
The sides of the U-shaped portion and the sides of the inverted U-shaped portion (11a), (11b), (11c), (12a), (12b) constituting the U-shaped portion (3) and the inverted U-shaped portion (4) in FIG. ) (12c) is formed with a conductor width and thickness such that the current density becomes uniform.
また、一対の磁電変換素子（７ａ）、（７ｂ）は、Ｕ字部（３）を構成するＵ字部の辺（１１ａ）、（１１ｂ）、（１１ｃ）と逆Ｕ字部（４）を構成する逆Ｕ字部の辺（１２ａ）、（１２ｂ）、（１２ｃ）のそれぞれに３辺に囲われた内側に配置される。 Further, the pair of magnetron conversion elements (7a) and (7b) have sides (11a), (11b), (11c) and an inverted U-shaped portion (4) of the U-shaped portion constituting the U-shaped portion (3). It is arranged inside each of the side (12a), (12b), and (12c) of the inverted U-shaped portion surrounded by three sides.
また、図３の一対の磁電変換素子（７ａ）、（７ｂ）は、電流密度が略均一な少なくとも一つの連続するＵ字部（３）と逆Ｕ字部（４）のそれぞれの３辺の内側で発生するＺ方向の磁束に対して最大の出力電圧を得る感磁方向を有している。
また、一対の磁電変換素子（７ａ）、（７ｂ）は、Ｕ字部（３）に繋がる直線部（１０）の幅方向の中心と、逆Ｕ字部（４）に繋がる直線部（１０）の幅方向の中心を結ぶ直線（１８）上であり、Ｕ字部（３）と逆Ｕ字部（４）の結合部の中心（１３）に点対称であり、Ｕ字部（３）の略中心線（５）と逆Ｕ字部（４）の略中心線（６）と重なる位置にそれぞれ配置される。Further, the pair of magnetic electric conversion elements (7a) and (7b) in FIG. 3 have at least one continuous U-shaped portion (3) and an inverted U-shaped portion (4) having substantially uniform current densities on each of the three sides. It has a magnetic sensing direction that obtains the maximum output voltage with respect to the magnetic flux in the Z direction generated inside.
Further, the pair of magnetic electric conversion elements (7a) and (7b) are centered in the width direction of the straight line portion (10) connected to the U-shaped portion (3) and the straight line portion (10) connected to the inverted U-shaped portion (4). It is on a straight line (18) connecting the centers in the width direction of the U-shaped portion, and is point-symmetrical to the center (13) of the joint portion between the U-shaped portion (3) and the inverted U-shaped portion (4). They are arranged at positions overlapping the substantially center line (5) and the substantially center line (6) of the inverted U-shaped portion (4).
また、一対の磁電変換素子（７ａ）、（７ｂ）近傍の磁束は、Ｕ字部（３）及び逆Ｕ字部（４）を構成するＵ字部の辺（１１ａ）及び逆Ｕ字部の辺（１２ａ）で発生するＸ方向の磁束と、Ｕ字部の辺（１１ｂ）及び逆Ｕ字部の辺（１２ｂ）で発生する前記Ｕ字部の辺（１１ａ）及び逆Ｕ字部の辺（１２ａ）で発生するＸ方向の磁束と対向するＸ方向の磁束との打消しの効果により減衰する。 Further, the magnetic flux in the vicinity of the pair of magnetic electric conversion elements (7a) and (7b) is the side (11a) and the inverted U-shaped portion of the U-shaped portion constituting the U-shaped portion (3) and the inverted U-shaped portion (4). The magnetic flux in the X direction generated on the side (12a) and the side (11a) and the inverted U-shaped portion of the U-shaped portion generated on the side (11b) of the U-shaped portion and the side (12b) of the inverted U-shaped portion. It is attenuated by the effect of canceling the magnetic flux in the X direction generated in (12a) and the magnetic flux in the X direction opposite to each other.
また、前記打消しの効果は、Ｕ字部（３）及び逆Ｕ字部（４）を構成するＵ字部の辺（１１ａ）及び逆Ｕ字部の辺（１２ａ）で発生するＸ方向の磁束と、Ｕ字部の辺（１１ｂ）及び逆Ｕ字部の辺（１２ｂ）で発生する前記Ｕ字部の辺（１１ａ）及び逆Ｕ字部の辺（１２ａ）で発生するＸ方向の磁束を略等しくするために、Ｕ字部の辺（１１ａ）（１１ｂ）及び（１２ａ）（１２ｂ）の電流密度は均一である。 Further, the effect of the cancellation is generated in the X direction on the side (11a) of the U-shaped portion and the side (12a) of the inverted U-shaped portion constituting the U-shaped portion (3) and the inverted U-shaped portion (4). The current density and the X-direction magnetic flux generated on the U-shaped side (11a) and the inverted U-shaped side (12b) and the inverted U-shaped side (12a). The current densities of the sides (11a) (11b) and (12a) (12b) of the U-shaped portion are uniform in order to make them substantially equal.
次に、一対の磁電変換素子（７ａ）、（７ｂ）はＺ方向にそれぞれ対向する感度を有するように回路部（１５）により制御される。
また、前記回路部（１５）は、前記一対の磁電変換素子（７ａ）、（７ｂ）の感度を略同一に調整する機能を有する。
また、前記回路部（１５）は、前記一対の磁電変換素子（７ａ）、（７ｂ）それぞれの差を演算し、前記演算の結果を増幅する機能を有する。Next, the pair of magnetron conversion elements (7a) and (7b) are controlled by the circuit unit (15) so as to have sensitivities facing each other in the Z direction.
Further, the circuit unit (15) has a function of adjusting the sensitivities of the pair of magnetron conversion elements (7a) and (7b) to be substantially the same.
Further, the circuit unit (15) has a function of calculating the difference between the pair of magnetron conversion elements (7a) and (7b) and amplifying the result of the calculation.
次に、図３に示す一対の磁電変換素子（７ａ）、（７ｂ）は一つの基材（８）の同一平面上であり、且つ前記基材（８）の同一平面が、Ｕ字部（３）と逆Ｕ字部（４）のＸＹ面と近接し、略平行に設置される。
また、図示では省略するが、Ｕ字部（３）と逆Ｕ字部（４）と基材（８）はエポキシ等の樹脂で固定される。Next, the pair of magnetron conversion elements (7a) and (7b) shown in FIG. 3 are on the same plane of one base material (8), and the same plane of the base material (8) is a U-shaped portion ( 3) and the inverted U-shaped portion (4) are installed close to the XY plane and substantially parallel to each other.
Although not shown in the drawing, the U-shaped portion (3), the inverted U-shaped portion (4), and the base material (8) are fixed with a resin such as epoxy.
例えば、一対の磁電変換素子（７ａ）、（７ｂ）の感磁面は、基材（８）の同一平面上に設置されるが、Ｕ字部（３）とＵ字部（４）のＸＹ面と前記基材（８）の同一平面が平行ではなく、位置ずれにより傾いて設置された場合、一対の磁電変換素子（７ａ）、（７ｂ）には本来の感度方向であるＺ方向の面外方向であるＸ方向とＹ方向の磁束が混入して検出誤差の要因となる。しかし、一対の磁電変換素子（７ａ）、（７ｂ）はそれぞれ対向する感度を有し、且つ略同一の感度に調整され、且つ後段の回路部（１５）で差を演算することにより、前記検出誤差の要因となるＸ方向とＹ方向の磁束の影響を低減でき、また、電流検出装置１の外部で発生する磁束の低減もできる。
さらに、連続するＵ字部（３）と逆Ｕ字部（４）により、
一対の磁電変換素子（７ａ）、（７ｂ）近傍のＸ方向の磁束が打消し効果で減衰することから、前記検出誤差の要因となるＸ方向の磁束の影響を低減できる。For example, the magnetic flux-sensitive surfaces of the pair of magnetic-electric conversion elements (7a) and (7b) are installed on the same plane of the base material (8), but the U-shaped portion (3) and the U-shaped portion (4) are XY. When the plane and the same plane of the base material (8) are not parallel and are installed at an angle due to misalignment, the pair of magnetic electroconversion elements (7a) and (7b) have a surface in the Z direction, which is the original sensitivity direction. The magnetic fluxes in the X and Y directions, which are the outer directions, are mixed and cause a detection error. However, the pair of magnetron conversion elements (7a) and (7b) have opposite sensitivities, are adjusted to substantially the same sensitivity, and the difference is calculated by the circuit unit (15) in the subsequent stage. The influence of the magnetic fluxes in the X and Y directions, which cause an error, can be reduced, and the magnetic flux generated outside the
Further, by the continuous U-shaped part (3) and the inverted U-shaped part (4),
Since the magnetic flux in the X direction in the vicinity of the pair of magnetron conversion elements (7a) and (7b) is attenuated by the canceling effect, the influence of the magnetic flux in the X direction, which causes the detection error, can be reduced.
図４は、一対の磁電変換素子（７ａ）、（７ｂ）の感磁方向と面外方向のＹ方向の磁束密度を示す表である。また、前記表には前記一対の磁電変換素子（７ａ）、（７ｂ）のＹ方向の磁束密度と比較するための測定点（１４）のＹ方向の磁束密度も含める。 FIG. 4 is a table showing the magnetic flux densities of the pair of magnetron conversion elements (7a) and (7b) in the magnetic sensing direction and the Y direction in the out-of-plane direction. The table also includes the magnetic flux density in the Y direction of the measurement point (14) for comparison with the magnetic flux density in the Y direction of the pair of magnetron conversion elements (7a) and (7b).
また、前記表は、仮に連続するＵ字部（３）と逆Ｕ字部（４）に８００Ａ印加した場合を例示しており、一対の磁電変換素子（７ａ）、（７ｂ）のＹ方向の磁束密度は、測定点（１４）のＹ方向の磁束密度と比較して約半分に減衰している。 Further, the above table illustrates a case where 800A is applied to the continuous U-shaped portion (3) and the inverted U-shaped portion (4), and the pair of electromagnetic conversion elements (7a) and (7b) in the Y direction. The magnetic flux density is attenuated by about half as compared with the magnetic flux density in the Y direction at the measurement point (14).
図５は、特許文献１に記載の電流検出装置を例示するものであり、導体（１６）と一対の検出素子（１７ａ）、（１７ｂ）で構成される。
図６は、図３に示す一対の磁電変換素子（７ａ）、（７ｂ）と図５に示す一対の検出素子（１７ａ）、（１７ｂ）のそれぞれの感磁方向であるＺ方向と面外方向であるＸ方向の磁束密度を示す表である。FIG. 5 illustrates the current detection device described in
FIG. 6 shows the Z direction and the out-of-plane direction, which are the magnetic flux directions of the pair of magnetron conversion elements (7a) and (7b) shown in FIG. 3 and the pair of detection elements (17a) and (17b) shown in FIG. It is a table which shows the magnetic flux density in the X direction.
また、前記表は、仮に図３の連続するＵ字部（３）と逆Ｕ字部（４）と、図５の導体（１６）に８００Ａ印加した場合を例示しており、
前記図３の一対の磁電変換素子（７ａ）、（７ｂ）のＸ方向の磁束密度は、前記図５の一対の検出素子（１７ａ）、（１７ｂ）のＸ方向の磁束密度と比較して約半分以下に低いことから、図３の一対の磁電変換素子（７ａ）、（７ｂ）が、基材（８）の平面上に平行せず、位置ずれにより傾いて設置された場合、本来の感度方向であるＺ方向の面外方向であるＸ方向の磁束が混入することによる検出誤差は低減する。Further, the table illustrates a case where 800A is applied to the continuous U-shaped portion (3) and the inverted U-shaped portion (4) in FIG. 3 and the conductor (16) in FIG.
The magnetic flux densities of the pair of electromagnetic conversion elements (7a) and (7b) in FIG. 3 in the X direction are approximately the same as those of the pair of detection elements (17a) and (17b) in FIG. 5 in the X direction. Since it is lower than half, the original sensitivity when the pair of electromagnetic conversion elements (7a) and (7b) in FIG. 3 are not parallel to the plane of the base material (8) and are tilted due to misalignment. The detection error due to the mixing of the magnetic flux in the X direction, which is the out-of-plane direction in the Z direction, which is the direction, is reduced.
１ 電流検出装置、２ 一次導体、３ Ｕ字部、４ 逆Ｕ字部、５ Ｕ字部の略中心線、６ 逆Ｕ字部の略中心線、７ａ 一対の磁電変換素子、７ｂ 一対の磁電変換素子、８ 基材、９ 感磁面、１０ 直線部、１１ａ Ｕ字部の辺、１１ｂ Ｕ字部の辺、１１ｃ Ｕ字部の辺、１２ａ 逆Ｕ字部の辺、１２ｂ 逆Ｕ字部の辺、１２ｃ 逆Ｕ字部の辺、１３ 結合部の中心、１４ 測定点、１５ 回路部、１６ 導体、１７ａ 検出素子、１７ｂ 検出素子、１８ 幅方向の中心を結ぶ直線、１９ 導体入力のプラス側（入口）、２０ 導体入力のマイナス側（出口）1 Current detector, 2 Primary conductor, 3 U-shaped part, 4 Inverted U-shaped part, 5 Approximate center line of U-shaped part, 6 Approximate center line of inverted U-shaped part, 7a Pair of magnetic conversion elements, 7b Pair of magnetic electricity Conversion element, 8 base material, 9 magnetically sensitive surface, 10 straight part, 11a U-shaped side, 11b U-shaped side, 11c U-shaped side, 12a inverted U-shaped side, 12b inverted U-shaped part Side, 12c inverted U-shaped side, 13 coupling part center, 14 measurement point, 15 circuit part, 16 conductor, 17a detection element, 17b detection element, 18 straight line connecting the center in the width direction, 19 conductor input plus Side (entrance), minus side (exit) of 20 conductor input
Claims (12)
前記連続するＵ字部と逆Ｕ字部は、電流密度が均一であり、
前記連続するＵ字部と逆Ｕ字部に繋がる直線部を備え、
前記連続するＵ字部と逆Ｕ字部のそれぞれが結合する中心に点対称に配置され、
前記一対の磁電変換素子は、前記連続するＵ字部と逆Ｕ字部のそれぞれに繋がる一次導体の直線部の幅方向の中心を結ぶ直線上であり、
前記連続するＵ字部と逆Ｕ字部の面に近接し、
前記連続するＵ字部と逆Ｕ字部のそれぞれの３辺の内側に面し、
前記連続するＵ字部と逆Ｕ字部のそれぞれの略中心線上であり、
前記連続するＵ字部と逆Ｕ字部のそれぞれが結合する中心に点対称に配置され、
前記回路部により、それぞれが対向方向に制御されることで、前記一対の磁電変換素子の感度方向と面外方向の磁束を抑制することを特徴とする電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It is provided with a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit for controlling the magnetron conversion element.
The continuous U-shaped portion and the inverted U-shaped portion have a uniform current density.
A straight line portion connected to the continuous U-shaped portion and the inverted U-shaped portion is provided.
The continuous U-shaped portion and the inverted U-shaped portion are arranged point-symmetrically at the center where they are connected.
The pair of magnetron conversion elements are on a straight line connecting the centers in the width direction of the straight line portion of the primary conductor connected to each of the continuous U-shaped portion and the inverted U-shaped portion.
Close to the surface of the continuous U-shaped part and the inverted U-shaped part,
Facing the inside of each of the three sides of the continuous U-shaped part and the inverted U-shaped part,
It is on the substantially center line of each of the continuous U-shaped portion and the inverted U-shaped portion.
The continuous U-shaped portion and the inverted U-shaped portion are arranged point-symmetrically at the center where they are connected.
A current detection device characterized in that the magnetic fluxes in the sensitivity direction and the out-of-plane direction of the pair of magnetron conversion elements are suppressed by being controlled in opposite directions by the circuit unit.
前記一対の磁電変換素子の感磁面が同一平面上に設置されることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the magnetically sensitive surfaces of the pair of magnetron conversion elements are installed on the same plane.
前記一対の磁電変換素子が、一つの基材に設置されることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It is provided with a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit for controlling the magnetron conversion element.
The current detection device according to claim 1, wherein the pair of magnetron conversion elements are installed on one base material.
前記一対の磁電変換素子が前記回路部により、略同一の感度に調整されることを特徴とする請求項１または２または３に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detecting device according to claim 1, 2 or 3, wherein the pair of magnetron conversion elements are adjusted to substantially the same sensitivity by the circuit unit.
前記基材がガラスエポキシ材で形成されるプリント配線基板であることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the base material is a printed wiring board made of a glass epoxy material.
前記基材が半導体ＩＣを形成するシリコン基板であることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It is provided with a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit for controlling the magnetron conversion element.
The current detection device according to claim 1, wherein the base material is a silicon substrate on which a semiconductor IC is formed.
前記連続するＵ字部と逆Ｕ字部が前記基材とエポキシ等の樹脂材で固定されることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the continuous U-shaped portion and the inverted U-shaped portion are fixed to the base material with a resin material such as epoxy.
前記磁電変換素子が設置される基材がガラスエポキシ材で形成されるプリント配線基板で形成されることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the base material on which the magnetron conversion element is installed is formed of a printed wiring board made of a glass epoxy material.
前記磁電変換素子が設置される基材が半導体ＩＣを形成するシリコン基材で形成されることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the base material on which the magnetron conversion element is installed is formed of a silicon base material forming a semiconductor IC.
前記磁電変換素子がホール素子であることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It is provided with a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit for controlling the magnetron conversion element.
The current detection device according to claim 1, wherein the magnetron conversion element is a Hall element.
前記磁電変換素子が磁気抵抗効果素子であることを特徴とする請求項１に記載の電流検出装置。A primary conductor having a continuous U-shaped portion and an inverted U-shaped portion to which a current to be measured is applied, and at least a pair of primary conductors installed so as to apply magnetic flux generated in the continuous U-shaped portion and the inverted U-shaped portion. It includes a magnetron conversion element, a base material on which the magnetron conversion element is installed, and a circuit unit that controls the magnetron conversion element.
The current detection device according to claim 1, wherein the magnetoelectric conversion element is a magnetoresistive effect element.
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