Current detection device

Abstract

The current detection device of the present invention can suppress the deformation of the housing and the cover caused by temperature rise. Therefore, it can accurately sense the magnetic field generated by the measured current flowing in each of the plurality of busbars, and can maintain high current detection accuracy. The current detection device is configured such that a first shielding plate is disposed on the side of the magnetic sensor, and a second shielding plate is disposed on the side of the busbar, so that the busbar and the magnetic sensor are sandwiched in the thickness direction of the busbar. A plurality of first shielding plates on the magnetic sensor side are integrally formed with the cover, and the cover is at least partially divided between adjacent first shielding plates. A plurality of second shielding plates disposed on the side of the busbar are integrally formed with the housing.

Description

Technical Field

[0001] The present invention relates to a current detection device capable of measuring a current flowing in a bus bar. Background Art

[0002] The current sensor described in Patent Document 1 includes: two shielding plates arranged opposite to each other in a parallel plate shape; three bus bars arranged in parallel in an accommodation space between the respective shielding plates; and detection elements provided corresponding to the respective bus bars. Each shielding plate has a slit provided in the longitudinal dimension direction of the bus bar and a support portion for supporting a part separated in the arrangement direction of the bus bars through the slit and another part at a portion corresponding to between adjacent bus bars in each bus bar. Thereby, it is possible to suppress magnetic saturation in a part of the shielding plate and prevent a decrease in the magnetic shielding function.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017 - 72467 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In recent years, the current measured by a current detection device has a tendency to gradually increase. Along with this, the bus bars, shielding plates, covers and housings that accommodate them have been continuously enlarged. In such a large current detection device, for example, the current sensor described in Patent Document 1, if deformation occurs in the cover, housing, etc. due to a temperature rise, the distance between the detection element and the bus bar and the distance between the detection element and the shielding plate will be different from those before the temperature rise. In addition, depending on the position, the distance will be uneven, and the current detection accuracy may decline.

[0008] Therefore, an object of the present invention is to provide a current detection device capable of suppressing deformation of a housing and a cover caused by a temperature rise, and thereby accurately sensing a magnetic field generated by a measured current flowing in each of a plurality of bus bars and maintaining high current detection accuracy.

[0009] Solutions to the Problems

[0010] In order to solve the above problems, the current detection device of the present invention is characterized by comprising: a housing; a cover fixed to the housing; a plurality of plate-shaped busbars through which the current to be measured flows; a plurality of magnetic sensors for sensing the magnetic field generated by the current to be measured flowing through the busbars; and a substrate on which a plurality of the magnetic sensors are mounted. The current detection device further comprises a plurality of pairs of shielding plates, each pair of shielding plates facing each other in the thickness direction of the busbar. The plurality of magnetic sensors are respectively arranged corresponding to the plurality of busbars, and are arranged facing the plurality of busbars respectively in the thickness direction of the busbar. A pair of shielding plates is composed of a first shielding plate and a second shielding plate. In the thickness direction of the busbar, a pair of shielding plates is arranged to sandwich the busbar and the magnetic sensor. The plurality of first shielding plates on the magnetic sensor side are integrally formed with the cover, and at least a part of the cover is divided between adjacent first shielding plates. The plurality of second shielding plates arranged on the busbar side are integrally formed with the housing.

[0011] Thereby, deformation of the cover when the temperature rises can be suppressed, so that uneven distances from the magnetic sensors can be prevented. Therefore, magnetic saturation does not occur in a part of the shielding plates, and high-precision current detection can be performed.

[0012] In the current detection device of the present invention, preferably, the first shielding plate is arranged on the magnetic sensor side, and the second shielding plate is arranged on the busbar side.

[0013] In addition, preferably, the plurality of second shielding plates and the plurality of busbars facing these second shielding plates are integrally formed with the housing.

[0014] Thereby, the relative positions of the second shielding plates with respect to the respective busbars are determined, so that the shielding performance can be improved.

[0015] In the current detection device of the present invention, preferably, at least a part of the substrate is divided between adjacent magnetic sensors.

[0016] Thereby, deformation of the substrate when the temperature rises can be suppressed, so that the distances between the magnetic sensors on the substrate and the busbars can be kept uniform, and the current flowing through the busbars can be detected with high precision.

[0017] In the current detection device of the present invention, preferably, for all the magnetic sensors, the substrates are separated from each other, and the wiring parts for electrically connecting between adjacent substrates are integrally formed with the housing.

[0018] Thereby, deformation of the substrate when the temperature rises can be more reliably suppressed, and power-on between adjacent substrates can be ensured.

[0019] Advantages of the Invention

[0020] According to the present invention, a current detection device can be provided that can suppress deformation of a housing and a cover caused by a temperature rise. As a result, a magnetic field generated by a measured current flowing in each of a plurality of bus bars can be accurately sensed, and high current detection accuracy can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a perspective view showing the configuration of a current detection device according to a first embodiment of the present invention.

[0022] Figure 2 (a) is a top view showing the configuration of the current detection device according to the first embodiment, Figure 2 (b) is Figure 2 a cross-sectional view taken along line A - A' of (a).

[0023] Figure 3 (a) is a perspective view showing the configuration of a current detection device according to a modification of the first embodiment, Figure 3 (b) is Figure 3 a top view of the current detection device shown in (a).

[0024] Figure 4 (a) is a cross-sectional view showing the configuration of a current detection device according to a second embodiment, Figure 4 (b) is Figure 4 a top view showing the current detection device in (a) with the cover member omitted.

[0025] Figure 5 (a) is a graph showing the error of the current detection result at high temperature relative to the current detection result at normal temperature, Figure 5 (b) is a graph showing the error of the detection result after 1000 hours relative to the initial detection result when current detection is continuously performed at high temperature.

[0026] Figure 6 (a) is a top view showing the configuration of a current detection device according to a first modification of the second embodiment, Figure 6 (b) is a top view showing the configuration of a current detection device according to a second modification of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, a current detection device according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0028] <First Embodiment>

[0029] Figure 1 FIG. is a perspective view showing the configuration of a current detection device 10 according to the first embodiment, Figure 2 (a) is a top view showing the configuration of the current detection device 10,Figure 2 (b) is Figure 2 a sectional view taken along line A - A' of (a). In Figure 2 (a), Figure 2 (b), a part of the shown configuration is omitted Figure 1 and simplifiedly represented.

[0030] As Figure 1 , Figure 2 (a), Figure 2 (b) shows, the current detection device 10 includes: three cover members 11, 12, 13 configured as covers on the upper side ( Figure 1 and Figure 2 the Z1 side of (b)); and a housing member 14 configured as a housing on the lower side ( Figure 1 and Figure 2 the Z2 side of (b)). Three bus bars 21, 22, 23 penetrate the housing member 14 along the width direction of the housing member 14 ( Figure 1 and Figure 2 (a), Figure 2 (b) in the Y1 - Y2 direction). Additionally, in the following description, a configuration in which three cover members, bus bars, magnetic sensors, and paired upper and lower shielding plates are respectively provided will be described, but it can also be configured as a two - setting mode or a four - or - more - setting mode with the same configuration.

[0031] The three cover members 11, 12, 13 have the same plate - like shape as each other, and are equally spaced in the long - dimension direction of the housing member 14 ( Figure 1 and Figure 2 (a), Figure 2 (b) in the X1 - X2 direction) and are respectively fixed to the housing member 14. In other words, the cover members fixed to the housing member 14 are arranged separately from each other in the long - dimension direction of the housing member 14.

[0032] First shielding plates 51, 52, 53 are respectively provided in the three cover members 11, 12, 13. The first shielding plates 51, 52, 53 are formed integrally with the three cover members 11, 12, 13 by molding, for example, and are arranged to extend in the X - Y plane (a plane including the X1 - X2 direction and the Y1 - Y2 direction). That is, a plurality of first shielding plates on the magnetic sensor side are formed integrally with the cover.

[0033] Inside the housing member 14, in the thickness direction (Z1-Z2 direction, up and down direction) of the bus bars 21, 22, 23, the second shielding plates 61, 62, 63 are arranged so as to face the first shielding plates 51, 52, 53 with the bus bars 21, 22, 23 interposed therebetween respectively. The second shielding plates 61, 62, 63 are formed integrally with the housing member 14 by molding, for example, and are arranged separately from each other in the long dimension direction (X1-X2 direction) of the housing member 14 so as to extend in the X-Y plane. Thus, the first shielding plate 51 and the second shielding plate 61, the first shielding plate 52 and the second shielding plate 62, and the first shielding plate 53 and the second shielding plate 63 are respectively paired to constitute three pairs of shielding plates.

[0034] The three bus bars 21, 22, 23 are made of a conductive plate-like material having the same shape as each other, and are arranged such that the two opposed plate surfaces respectively correspond to the up and down (Z1-Z2 direction) of the housing member 14, and extend in a strip shape along the width direction (Y1-Y2 direction) of the housing member 14, and are arranged at equal intervals in the long dimension direction ( Figure 1 , Figure 2 (a), Figure 2 (b) of X1-X2 direction) of the housing member 14. The three bus bars 21, 22, 23 are respectively sandwiched in their thickness direction by three sets of shielding plates, namely, the first shielding plate 51 and the second shielding plate 61, the first shielding plate 52 and the second shielding plate 62, and the first shielding plate 53 and the second shielding plate 63.

[0035] As Figure 2 (b) shows, inside the housing member 14, a circuit board 30 is arranged so as to extend in the long dimension direction (X1-X2 direction), and magnetic sensors 41, 42, 43 are respectively mounted at positions corresponding to the bus bars 21, 22, 23 in the X-Y plane on the bottom surface of the circuit board 30.

[0036] In addition, the magnetic sensors 41, 42, 43 can be provided on either the upper surface or the lower surface of the circuit board 30.

[0037] For the magnetic sensors 41, 42, 43, the arrangement of each of the magnetic sensors 41, 42, 43 with respect to each of the bus bars 21, 22, 23, the arrangement of each of the three pairs of shielding plates (each pair of the first shielding plates 51, 52, 53 and the second shielding plates 61, 62, 63) with respect to each of the magnetic sensors 41, 42, 43, and the functions / effects obtained by these arrangements are the same as each other. Therefore, the magnetic sensor 42 is taken as an example for illustration here.

[0038] As Figure 2 (a) or Figure 2As shown in (b), the magnetic sensor 42 is disposed at a position corresponding to the center of the long dimension direction (Y1 - Y2 direction) of the bus bar 22, and the bus bar 22 and the magnetic sensor 42 are opposed to each other vertically. Further, in the width direction (X1 - X2 direction) of the bus bar 22, the magnetic sensor 42 and the bus bar 22 are disposed to be opposed to each other in a manner corresponding to the positions in the X - Y plane. Since the magnetic sensor 42 is disposed corresponding to the bus bar 22 in this way, the magnetic sensor 42 can measure the current value of the measured current by detecting the induced magnetic field generated by the current (measured current) flowing in the bus bar 22. The magnetic sensor 42 is constituted by using a magnetoresistive effect element such as a GMR element (giant magnetoresistive effect element), for example.

[0039] The magnetic sensor 42 is sandwiched in the thickness direction of the bus bar 22 by a pair of shielding plates, i.e., a first shielding plate 52 within the cover member 12 and a second shielding plate 62 disposed within the housing member 14. Thus, in the thickness direction of the bus bar 22, the magnetic sensor 42 and the bus bar 22 are disposed to be sandwiched by the first shielding plate 52 and the second shielding plate 62, with the first shielding plate 51 disposed on the magnetic sensor 42 side and the second shielding plate 61 disposed on the bus bar 22 side. Alternatively, a configuration may be adopted in which the first shielding plate 51 is disposed on the bus bar 22 side and the second shielding plate 61 is disposed on the magnetic sensor 42 side.

[0040] The first shielding plate 52 and the second shielding plate 62 are preferably formed of a ferromagnetic material as a magnetic shield made of the same magnetic material, and are disposed to be opposed to each other in parallel in the vertical direction. The first shielding plate 52 and the second shielding plate 62 each have a configuration obtained by stacking a plurality of metal plates having the same rectangular shape and the same size when viewed from above. In this way, by disposing the first shielding plate 52 and the second shielding plate 62 so as to sandwich the magnetic sensor 42, the magnetic sensor 42 blocks external magnetic fields (external magnetic fields) such as the induced magnetic field generated by the current flowing in the adjacent bus bars 21 and 23, thereby suppressing their influence.

[0041] With the above-described configuration, even if the temperature rises significantly due to a large current flowing through the bus bars 21, 22, and 23, since the cover members 11, 12, and 13 are separated from each other, deformation can be suppressed to a small extent. In addition, when the high-temperature state continues, heat dissipation is easy and deformation is difficult to occur. In other words, assuming that the cover members 11, 12, and 13 are not locally divided but integrally formed, warping is likely to occur in the cover members, and deviation is likely to occur in the arrangement positions of the first shielding plates 51, 52, and 53. It can be considered that the shielding performance deteriorates and the detection accuracy deteriorates due to the deviation of the arrangement positions. Therefore, by adopting the configuration of the present embodiment, it is possible to sense the magnetic field generated by the measured current flowing through each of the bus bars 21, 22, and 23 as accurately as in the case of normal temperature, and high current detection accuracy can be maintained even when a large current flows.

[0042] A modified example will be described below.

[0043] Figure 3 (a) is a perspective view showing the configuration of a current detection device 110 according to a modified example of the first embodiment, Figure 3 (b) is a top view of the current detection device 110. In Figure 3 (b), Figure 3 a part of the configuration shown in Figure 1 、 Figure 2 (a) Figure 2 is omitted and simplified. In this current detection device 110, instead of Figure 3 (a) Figure 3 (b) showing the three cover members 11, 12, and 13 separated from each other as shown, as shown in

[0044] a part of the three cover members 111, 112, and 113 that are the covers are connected to each other. In other words, a part of the cover is divided between the first shielding plates, and the remaining parts are connected to each other, thereby forming a slit or notch extending in the front-rear direction (Y1 - Y2 direction) between adjacent cover members. Figure 1 、 Figure 2 (a) Figure 2 (b) showing the housing member 14 (housing), the three bus bars 21, 22, and 23, the circuit board 30, the three magnetic sensors 41, 42, and 43, and the second shielding plates 61, 62, and 63, the housing member 114 (housing), the three bus bars 121, 122, and 123, the circuit board 130, the three magnetic sensors 141, 142, and 143, and the second shielding plate (not shown) in the modified example have the same configuration / arrangement.

[0045] The three cover members 111, 112, and 113 and Figure 1 、Figure 2 (a), Figure 2 The cover members 11, 12, and 13 shown in (b) also have the same plate-like shape as each other and are arranged at equal intervals in the longitudinal dimension direction (X1 - X2 direction) of the housing member 114. Moreover, two adjacent cover members 111, 112 are connected by a first connecting portion 115 extending in the longitudinal dimension direction of the housing member 114, and two adjacent cover members 112, 113 are connected by a second connecting portion 116 extending in the longitudinal dimension direction of the housing member 114. The three cover members 111, 112, 113 and the two connecting portions 115, 116 are integrally formed of the same material and the same thickness, for example, by molding, in a manner extending along the X - Y plane. Inside the three cover members 111, 112, 113, as Figure 2 shown in (b), first shielding plates 51, 52, and 53 are respectively provided.

[0046] In addition, in Figure 3 (a), Figure 3 in the example shown in (b), the first connecting portion 115 is arranged on the inner side (Y2 side) in the X - Y plane, and the second connecting portion 116 is arranged on the front side (Y1 side). However, the widths of the two connecting portions 115, 116 and their positions in the front - rear direction (Y1 - Y2 direction) can be arbitrarily set according to the detected accuracy obtained, the deformation amounts of the three cover members 111, 112, 113, etc.

[0047] As described above, the three cover members 111, 112, 113 are connected by the two connecting portions 115, 116, and a cover with a partially divided portion is formed between adjacent first shielding plates. The divided range and the size / shape of the connecting portion can be arbitrarily set. The fixing of the cover to the housing member 114 can be performed by fixing either one or both of the three cover members 111, 112, 113 and the two connecting portions 115, 116 to the housing member 114.

[0048] By configuring the cover in this way, the effect of suppressing deformation caused by temperature rise can be obtained, and the assemblability of the cover can be improved in the manufacturing process of the current detection device 110.

[0049] <Second Embodiment>

[0050] Figure 4 (a) is a cross-sectional view showing the configuration of the current detection device 210 according to the second embodiment, and is a view of the corresponding position to Figure 1 (b). Figure 4 (b) is a top view showing the current detection device 210 with the cover members 211, 212, 213 omitted.

[0051] In the current detection device 210 of the second embodiment, instead ofFigure 2 (a), Figure 2 The circuit board 30 of the first embodiment shown in (b) uses three circuit boards 231, 232, and 233 that are separated between adjacent magnetic sensors 241, 242, and 243. These circuit boards 231, 232, and 233 are arranged at equal intervals in the long dimension direction (X1 - X2 direction) of the housing member 214 and are mounted / fixed on the housing member 214. Two adjacent circuit boards 231 and 232 are electrically connected to each other by the first wiring portions 234 embedded in the housing member 214, and for two adjacent circuit boards 232 and 233, they are also electrically connected to each other by the second wiring portions 235 embedded in the housing member 214.

[0052] Here, in Figure 4 (a), Figure 4 In the example shown in (b), both of the two wiring portions 234 and 235 are arranged on the front side (Y1 side) in the X - Y plane, but it can be arbitrarily set according to the detected accuracy obtained, the deformation amounts of the three circuit boards 231, 232, and 233, etc., how wide these wiring portions 234 and 235 are arranged and at which position in the front - rear direction (Y1 - Y2 direction).

[0053] The three cover members 211, 212, 213, the housing member 214, the three bus bars 221, 222, 223, the three magnetic sensors 241, 242, 243, the three first shielding plates 251, 252, 253, and the three second shielding plates 261, 262, 263 respectively have the same constitution / configuration as the three cover members 11, 12, 13, the housing member 14, the three bus bars 21, 22, 23, the three magnetic sensors 41, 42, 43, the three first shielding plates 51, 52, 53, and the three second shielding plates 61, 62, 63 in the first embodiment.

[0054] Figure 5 (a) is a graph showing the error of the current detection result at high temperature (125°C) relative to the current detection result at normal temperature (25°C) ( Figure 5 (a)'s vertical axis: temperature error). Figure 5 (b) is a graph showing the error of the detection result after 1000 hours relative to the initial detection result when current detection is continuously performed at high temperature (125°C) ( Figure 5 (b)'s vertical axis: durability error). In Figure 5 (a), Figure 5In (b), the example is the case where the current detection device 210 of the second embodiment is used, and the comparative example is the case where, compared with the above example, the cover member is a single integral piece not divided into three parts, and the circuit board is also a single integral piece not divided into three parts.

[0055] Figure 5 (a), Figure 5 In the comparative examples of (a) and (b), the S part and the C part are parts schematically divided to show the contribution degree of the error caused by the deformation of the circuit board and the cover member. The S part represents the contribution of the error caused by the deformation of the circuit board, and the C part represents the contribution of the error caused by the deformation of the cover member.

[0056] As Figure 5 (a), Figure 5 (b) respectively show that: in the example, the temperature error becomes about 0.1%, the durability error becomes less than 0.1%, the influence caused by setting it to a high temperature becomes smaller, the deformation of each component such as the cover member caused by the temperature rise is suppressed, and the distances between the magnetic sensor and the bus bar, and between the magnetic sensor and the first shielding plate and the second shielding plate are maintained substantially constant. In contrast, in the comparative example, the temperature error becomes about 7 times that of the example, the durability error becomes about 10 times that of the example, the cover member and the circuit board are prone to deformation due to the temperature rise, and the distances between the magnetic sensor and the bus bar, and between the magnetic sensor and the first shielding plate and the second shielding plate change. Therefore, it can be considered that a large error will occur in the detection result of the current.

[0057] In addition, it can be seen that: Figure 5 (a), Figure 5 The S part and the C part in the comparative examples of (a) and (b) both become several times that of the example, and any deformation of the circuit board and the cover member has a great influence on the detection error. In addition, by comparing the S part and the C part, it can be seen that the influence caused by the deformation of the cover member is greater. Therefore, it can be seen that: as in the first embodiment, in the configuration where the circuit board 30 is a single integral piece and the cover is the cover members 11, 12, 13 divided into three parts, the effect of suppressing the detection error can be obtained.

[0058] The following describes the modification examples.

[0059] Figure 6 (a) is a top view showing the configuration of the current detection device 310 of the first modification example of the second embodiment, Figure 6 (b) is a top view showing the configuration of the current detection device of the second modification example of the second embodiment. Figure 6 (a), Figure 6 (b) and Figure 4 (b) are also top views showing the state where the cover member is omitted.

[0060] In the current detection device 310 of Modification 1, instead of using the two wiring portions 234 and 235 shown in Figure 4 (a) and Figure 4 (b), as shown in Figure 6 (a), the three circuit boards 331, 332, and 333 are connected to each other at a part. Two adjacent circuit boards 331 and 332 are connected by a first connection portion 334 extending in the longitudinal dimension direction (X1 - X2 direction) of the housing member 314, and are electrically connected to each other through a first wiring portion (not shown) provided in the first connection portion 334. Two adjacent circuit boards 332 and 333 are connected by a second connection portion 335 extending in the longitudinal dimension direction of the housing member 314, and are electrically connected to each other through a second wiring portion (not shown) provided in the second connection portion 335. The three circuit boards 331, 332, and 333 and the two connection portions 334 and 335 are integrally formed of the same material and the same thickness, for example, by molding, in a manner extending along the X - Y plane. In other words, between adjacent magnetic sensors, a part of the circuit board is divided, and the remaining parts are connected to each other.

[0061] The housing member 314 (housing), the three bus bars 321, 322, and 323, the three magnetic sensors 341, 342, and 343, and the second shielding plate (not shown) in Modification 1 each have the same configuration as the Figure 4 (a) or Figure 4 (b) shown housing member 214 (housing), the three bus bars 221, 222, and 223, the three magnetic sensors 241, 242, and 243, and the second shielding plates 261, 262, and 263.

[0062] Here, in the example shown in Figure 6 (a), both of the two connection portions 334 and 335 are arranged on the inner side (Y2 side) in the X - Y plane, but the width at which the two connection portions 334 and 335 are arranged at which position in the front - rear direction (Y1 - Y2 direction) can be arbitrarily set according to the detected accuracy obtained, the deformation amount of the three circuit boards 331, 332, and 333, etc. For example, as in the Figure 6 (b) shown Modification 2, the first connection portion 336 can be arranged on the inner side, and the second connection portion 337 can be arranged on the near - front side.

[0063] The present invention has been described with reference to the above - mentioned embodiments, but the present invention is not limited to the above - mentioned embodiments, and can be improved or changed within the scope of the purpose of improvement or the idea of the present invention.

[0064] Industrial Applicability

[0065] As described above, the current detection device of the present invention is useful in that it can suppress deformation of the housing and the cover due to temperature rise, and thus can accurately sense the magnetic field generated by the measured current flowing through each of the plurality of bus bars, and can maintain high current detection accuracy.

[0066] Description of Reference Numerals

[0067] 10 Current detection device

[0068] 11, 12, 13 Cover member (cover)

[0069] 14 Housing member (housing)

[0070] Twenty-one, twenty-two, twenty-three bus bars

[0071] 30 Circuit board

[0072] 41, 42, 43 Magnetic sensors

[0073] 51, 52, 53 First shielding plates

[0074] 61, 62, 63 Second shielding plates

[0075] 110 Current detection device

[0076] 111, 112, 113 Cover member (cover)

[0077] 114 Housing member (housing)

[0078] 115 First connecting portion

[0079] 116 Second connecting portion

[0080] 121, 122, 123 Bus bars

[0081] 130 Circuit board

[0082] 141, 142, 143 Magnetic sensors

[0083] 210 Current detection device

[0084] 211, 212, 213 Cover member (cover)

[0085] 214 Housing member (housing)

[0086] 221, 222, 223 Bus bars

[0087] 231, 232, 233 Circuit boards

[0088] 234 First wiring portion

[0089] 235 Second wiring portion

[0090] 241, 242, 243 magnetic sensors

[0091] 251, 252, 253 first shielding plate

[0092] 261, 262, 263 Second shielding plate

[0093] 310 Current detection device

[0094] 314 Shell parts (shell)

[0095] 321, 322, 323 bus bars

[0096] 331, 332, 333 circuit substrates

[0097] 334, 336 First connecting part

[0098] 335, 337 Second connecting part

[0099] 341, 342, 343 magnetic sensors

Claims

1. A current detection device, characterized in that, Comprising: A housing; A cover fixed to the above housing; A plurality of plate-shaped bus bars through which the current to be measured flows; A plurality of magnetic sensors for sensing the magnetic field generated by the current to be measured flowing in the above bus bars; and A substrate on which a plurality of the above magnetic sensors are mounted, The above current detection device further comprises a plurality of pairs of shielding plates, each pair of shielding plates being opposed to each other in the thickness direction of the above bus bar, A plurality of the above magnetic sensors are respectively arranged corresponding to a plurality of the above bus bars, and in the thickness direction of the above bus bar, a plurality of the above magnetic sensors are respectively arranged opposed to a plurality of the above bus bars, The above pair of shielding plates is composed of a first shielding plate and a second shielding plate, and in the thickness direction of the above bus bar, the above pair of shielding plates is arranged to sandwich the above bus bar and the above magnetic sensors, A plurality of the above first shielding plates on the magnetic sensor side are integrally formed with the above cover, and at least a part of the above cover is divided between adjacent ones of the above first shielding plates, A plurality of the above second shielding plates arranged on the bus bar side are integrally formed with the above housing, The above first shielding plate is arranged on the magnetic sensor side, and the above second shielding plate is arranged on the bus bar side, A plurality of the above second shielding plates and a plurality of the above bus bars opposed to these second shielding plates are integrally formed with the above housing, At least a part of the above substrate is divided between adjacent ones of the above magnetic sensors.

2. The current detection device according to claim 1, wherein The above substrate is independently fixed to the above housing with respect to the above cover.

3. The current detection device according to claim 1 or 2, wherein For all of the above magnetic sensors, the above substrate is divided from each other, A wiring portion for electrically connecting between adjacent ones of the above substrates is integrally formed with the housing.

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