Magnetic sensor and current detection device having the same

Abstract

The magnetic sensor of the present invention can suppress the influence on the measurement results of the magnetic sensor to a small extent even if noise is generated from the bus bar when the voltage used to control the measured current flowing in the bus bar is switched on / off. The magnetic sensor has a main body, which has two side surfaces opposite to each other and can measure the current value of the measured current by detecting the induced magnetic field generated by the measured current flowing in the bus bar. Only on one of the two side surfaces of the main body, a signal terminal for outputting a detection signal and a power supply terminal for supplying power to the main body extend.

Description

Technical Field

[0001] The present invention relates to a magnetic sensor capable of measuring a current flowing through a bus bar and a current detection device including the magnetic sensor. Background Art

[0002] The current sensor described in Patent Document 1 includes: a current path having a U-shape; and a magnetoelectric conversion element for detecting a magnetic field generated when a current flows through the current path, and the current sensor is configured to include: an inner magnetic shielding member surrounding at least a portion of the U-shape and the magnetoelectric conversion element; and an outer magnetic shielding member surrounding at least a portion of the inner magnetic shielding member. When viewed along the normal direction of the plate-shaped current path, the magnetoelectric conversion element is arranged at a position that is centered within the top view shape of the current path.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-98633 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in a structure in which a magnetoelectric conversion element is configured in a current path like the current sensor of Patent Document 1, noise generated from the current path when the voltage used to control the current is switched on / off may enter from the output terminal and power supply terminal of the magnetoelectric conversion element, which may affect the result of the magnetoelectric conversion.

[0008] Therefore, an object of the present invention is to, in a magnetic sensor capable of detecting a current flowing in a bus bar and a current detection device having the magnetic sensor and the bus bar, suppress the influence on the measurement result of the magnetic sensor to be minimized even if noise is generated from the bus bar when switching on / off the voltage for controlling the measured current flowing in the bus bar.

[0009] Solutions for solving problems

[0010] In order to solve the above-mentioned problem, the magnetic sensor of the present invention is characterized in that it has a main body, which has two side surfaces opposite to each other and can measure the current value of the measured current by detecting the induced magnetic field generated by the measured current flowing in the bus bar, and only on one of the two side surfaces of the main body, a signal terminal for outputting a detection signal and a power supply terminal for supplying power to the main body extend.

[0011] Thus, one side surface where the signal terminal and the power terminal are provided is arranged away from the bus bar, so that even if noise is generated from the bus bar when switching on / off the voltage for controlling the measured current flowing in the bus bar, the influence on the detection result can be suppressed to a small extent.

[0012] The current detection device of the present invention is characterized in that it comprises: a plate-shaped bus bar; and a magnetic sensor, having a main body capable of measuring the current flowing in the bus bar, a signal terminal for outputting a detection signal and a power terminal for supplying power to the main body extending from the main body, the main body having a portion overlapping with the bus bar and a portion not overlapping with the bus bar when viewed along the thickness direction of the bus bar, and the signal terminal and the power terminal extending from the portion of the main body not overlapping with the bus bar in a manner not overlapping with the bus bar.

[0013] Therefore, when viewed from the thickness direction of the busbar, the signal terminal and the power terminal do not overlap with the busbar, and the distance from the busbar can be large. Therefore, even if noise is generated from the busbar when the on / off switching of the voltage for controlling the measured current flowing in the busbar is performed, the influence on the detection result can be suppressed to a small extent.

[0014] In the current detection device of the present invention, it is preferred that the busbar extends in a strip shape, and the signal terminal and the power terminal are arranged only on one side of the main body in the width direction orthogonal to the extension direction of the busbar. When observed along the thickness direction, one side of the main body is arranged at a position that does not overlap with the busbar in the width direction of the busbar.

[0015] This not only has the effect of suppressing the influence of noise on the detection result, but also has the effect of eliminating the size restriction of the bus bar corresponding to the other side where the signal terminal and the power terminal are not provided, so that the bus bar can be designed to a desired width.

[0016] In the current detection device of the present invention, it is preferred that there are two plate-shaped magnetic shielding parts, which are separated from each other in the thickness direction to clamp the bus bar and the magnetic sensor, and are formed in the same shape and the same size. The two plate-shaped magnetic shielding parts are respectively configured to be parallel to the bus bar, and are configured to overlap in a manner that they are not exposed to each other when viewed along the thickness direction of the bus bar. When viewed along the thickness direction of the bus bar, the main body and the two magnetic shielding parts are configured so that the centers of the planes are consistent with each other, and the center of the plane of the main body is located on the end face of the bus bar in the width direction.

[0017] By sandwiching the bus bar and the magnetic sensor between two magnetic shields, the influence of the external magnetic field can be suppressed to a minimum.

[0018] In the current detection device of the present invention, it is preferred that, when observed along the thickness direction of the bus bar, both sides of the portion of the bus bar overlapping with the main body in the extension direction of the bus bar extend in a direction different from the extension direction of the bus bar and away from the main body or in a direction with a constant distance from the main body.

[0019] This increases the area of ​​the entire bus bar, thereby reducing the resistance and suppressing heat generation.

[0020] Effects of the Invention

[0021] According to the present invention, even if noise is generated from the bus bar when switching on / off the voltage for controlling the current to be measured flowing through the bus bar, the influence on the measurement result of the magnetic sensor can be suppressed to be small. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 (a) is a perspective view showing the basic structure of a current detection device according to an embodiment of the present invention, Figure 1 (b) is an exploded perspective view of the current detection device.

[0023] Figure 2 (a) is along Figure 1 (a) is a cross-sectional view of the line A-A', Figure 2 (b) along Figure 1 (a) is a cross-sectional view of the line BB'.

[0024] Figure 3 It is a diagram showing the positional relationship between the bus bar and the magnetic sensor according to the first embodiment.

[0025] Figure 4 It is a diagram showing the positional relationship between the bus bar and the magnetic sensor according to the second embodiment.

[0026] Figure 5 It is a side view showing the arrangement of two shields, a magnetic sensor, and a bus bar in a current detection device according to a modified example of the second embodiment.

[0027] Figure 6 It is a plan view showing the positional relationship among the bus bar, the magnetic sensor, and the circuit board according to the third embodiment. DETAILED DESCRIPTION

[0028] Hereinafter, a magnetic sensor and a current detection device according to embodiments of the present invention will be described in detail with reference to the drawings.

[0029] First, based on Figure 1 and Figure 2 The basic structure of the current detection device 10 according to the embodiment will be described. The size and relative position of each component are referred to as Figures 3 to 6Each embodiment is described. Figure 1 (a) is a perspective view showing the basic structure of the current detection device 10. Figure 1 (b) is an exploded perspective view of the current detection device 10, Figure 2 (a) along Figure 1 (a) is a cross-sectional view of the line A-A', Figure 2 (b) Figure 1 (a) is a cross-sectional view of the line BB'.

[0030] like Figure 1 As shown, the current detection device 10 has the upper side ( Figure 1 Z1 side) of the cover member 11a and the lower side ( Figure 1 The housing 11 is a substantially rectangular parallelepiped housing 11 in which the housing parts 11b are fixed to each other, and the three bus bars 21, 22, and 23 are arranged in the width direction (Z2 side) of the housing 11. Figure 1 The Y1-Y2 direction) penetrates the outer shell component 11b.

[0031] The three bus bars 21, 22, and 23 are conductive plates of the same shape, and are arranged so that the two opposing plate surfaces correspond to the upper and lower sides of the housing 11, respectively, and extend in a strip shape along the width direction of the housing 11. Figure 1 The X1-X2 direction) is arranged at equal intervals.

[0032] like Figure 1 (b) and Figure 2 As shown in (b), a circuit board 30 is arranged in the housing 11 in a manner extending in the longitudinal direction (X1-X2 direction), and magnetic sensors 31, 32, 33 are arranged on the circuit board 30 at positions corresponding to the bus bars 21, 22, 23 in the XY plane (a plane including the X1-X2 direction and the Y1-Y2 direction). At least a part of the main body of the magnetic sensors 31, 32, 33 is opposed to each other in the vertical direction relative to the corresponding bus bar.

[0033] In addition, the magnetic sensors 31, 32, and 33 may be provided on any one of the upper surface and the lower surface of the circuit board 30. However, it is preferable that all of the magnetic sensors 31, 32, and 33 are provided on the same surface.

[0034] If the magnetic sensor 32 is taken as an example, Figure 2 As shown in (a), the magnetic sensor 32 is arranged at a position corresponding to the center of the width direction (Y1-Y2 direction) of the housing 11, and the bus bar 22 and the magnetic sensor 32 are vertically opposed to each other. Regarding the position of the magnetic sensor 32 in the width direction (X1-X2 direction) of the bus bar 22, Figure 1 (a) Figure 1 (b) Figure 2(a) Figure 2 (b) is shown hypothetically, and is specifically shown in the following embodiments. Since the magnetic sensor 32 is configured corresponding to the bus bar 22 in this way, the magnetic sensor 32 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 32 is composed of a magnetoresistive element such as a GMR element (giant magnetoresistive element).

[0035] The magnetic sensor 32 is sandwiched from above and below by a first shield 41a disposed in the cover member 11a and a second shield 41b disposed in the housing member 11b. The first shield 41a and the second shield 41b are magnetic shields made of magnetic material, preferably made of a ferromagnetic body, and are arranged to face each other in parallel in the vertical direction. The first shield 41a and the second shield 41b each have a structure in which a plurality of metal plates of the same rectangular shape and the same size are stacked up and down, as shown in FIG. Figure 2 As shown in (a), it has a length substantially the same as that of the circuit board 30 in the width direction (Y1-Y2 direction) and a size covering the bus bar 22 in the longitudinal direction (X1-X2 direction). Moreover, the first shield 41a and the second shield 41b overlap each other so as not to be exposed when viewed in the thickness direction of the bus bar 22. In this way, by arranging the first shield 41a and the second shield 41b so as to sandwich the magnetic sensor 32, the magnetic sensor 32 blocks the external magnetic field (external magnetic field) such as the induced magnetic field generated by the current flowing in the adjacent bus bars 21 and 23, thereby suppressing its influence.

[0036] In addition, the configuration of the magnetic sensor 32 relative to the bus bar 22, the configuration of the two shielding members 41a and 41b relative to the magnetic sensor 32, and the functions and effects of these configurations are also the same for the two magnetic sensors 31 and 33 located on the left and right of the magnetic sensor 32. In addition, in the case where the influence of the external magnetic field is small, the two shielding members 41a and 41b may not be provided.

[0037] <First embodiment>

[0038] Figure 3 (a) Figure 3 (b) is a diagram showing the positional relationship between the bus bar 120 and the magnetic sensor 130 according to the first embodiment. Figure 3 (a) is a side view, Figure 3 (b) is a top view. Figure 3 (a) Figure 3 In (b), the shapes of the bus bar 120 and the respective parts of the magnetic sensor 130 are schematically shown.

[0039] In the first embodiment, for Figure 1 and Figure 2 The current detection device 10 shown in FIG. Figure 3 (a) Figure 3 As shown in (b), the bus bar 120 and the magnetic sensor 130 are arranged with the size relationship as described below, and the magnetic sensor 130 is provided with a terminal as described later. Figure 1 and Figure 2 The current detection device 10 shown in the figure has a plurality of bus bars 120 made of the same material and shape as the above-mentioned bus bars 21, 22, and 23 passing through the shell 11, and a plurality of magnetic sensors 130 are arranged on the circuit substrate 30 in the shell 11 in a manner corresponding to the plurality of bus bars 120, respectively, and the plurality of magnetic sensors 130 are respectively clamped by two shielding parts 41a and 41b opposed to each other in the upper and lower directions.

[0040] Figure 3 (a) Figure 3 As shown in (b), the bus bar 120 is arranged along the width direction (Y1-Y2 direction, see Figure 2 ) is a plate-like member extending in a strip shape and having a thickness in the vertical direction (Z1-Z2 direction), and is composed of Figure 1 and Figure 2 The busbars 21 , 22 , 23 shown are made of the same material.

[0041] Figure 3 As shown in (b), the magnetic sensor 130 has a substantially rectangular shape in a top view observed in the up-down direction (Z1-Z2 direction), and includes: a main body 131 having a thickness in the up-down direction; and a plurality of terminals 132a, 132b extending outward from the side surface of the main body 131 (the end surface on the width direction side of the bus bar 120). The main body 131 detects the induced magnetic field generated by the current (measured current) flowing in the bus bar 120 opposite to the main body 131, thereby measuring the current value of the measured current and outputting the current value as a detection signal. Both the magnetic sensor 130 and the bus bar 120 have a thickness in the up-down direction, and in the following description, the state observed in the thickness direction is referred to as a top view.

[0042] The main body 131 has a first region 131a as a portion overlapping with the bus bar 120 in a plan view along the thickness direction, and a second region 131b and a third region 131c as portions not overlapping with the bus bar 120. More specifically, in the width direction (X1-X2 direction) of the bus bar 120, the first region 131a is provided in the center, and the second region 131b and the third region 131c are provided on both sides thereof, which are exposed to the outside of the bus bar 120 and do not overlap with the bus bar 120.

[0043] From the second area 131b ( Figure 3 A plurality of terminals 132a extend outward from the side surface of the bus bar 120 along the width direction of the bus bar 120, and from the third area 131c ( Figure 3 The side surface of the right side of (b) also extends outwardly along the width direction of the bus bar 120. Therefore, the terminals 132a and 132b extend outward without overlapping the bus bar 120 in a plan view.

[0044] The plurality of terminals 132a and 132b include a signal terminal for outputting a detection signal detected by the main body 131 and a power terminal for supplying power to the main body 131. In addition to these terminals, there is a terminal for calibrating the detection signal before shipment, for example.

[0045] In a plan view, all the terminals 132a and 132b including the signal terminals and the power terminals extend outward from the second region 131b and the third region 131c of the main body 131, which are portions not overlapping with the bus bar 120, respectively, so as not to overlap with the bus bar 120. Thus, all the terminals 132a and 132b do not face the bus bar 120 in the thickness direction, and thus can be spaced farther from the bus bar 120 than when they face each other. Therefore, it is possible to suppress the influence of noise generated from the bus bar 120 when the application of current to the bus bar 120 is started or stopped, that is, when the voltage for controlling the measured current flowing in the bus bar 120 is switched on / off, and, for example, it is possible to suppress the influence of noise on the signal terminals and on the mounted components on the circuit board 30 electrically connected to the signal terminals.

[0046] In addition, if Figure 2 (a) Figure 2 As shown in (b), the circuit board 30 provided with the magnetic sensor 130 is sandwiched by two shielding members 41a and 41b facing each other from top to bottom. Thus, the magnetic sensor 130 on the circuit board 30 is sandwiched from top to bottom by the first shielding member 41a and the second shielding member 41b, so that the external magnetic field such as the induced magnetic field generated by the current flowing in the adjacent bus bar is shielded, and its influence is suppressed to a small extent.

[0047] <Second embodiment>

[0048] Figure 4 (a) Figure 4 (b) is a diagram showing the positional relationship between the bus bar 220 and the magnetic sensor 230 according to the second embodiment, (a) is a side view, and (b) is a top view. Figure 4 (a) Figure 4In (b), the shapes of the bus bar 120 and the respective parts of the magnetic sensor 130 are schematically shown.

[0049] In the second embodiment, for Figure 1 and Figure 2 The current detection device 10 shown in FIG. Figure 4 (a) Figure 4 As shown in (b), the bus bar 220 and the magnetic sensor 230 are arranged with the size relationship as described below, and the magnetic sensor 230 is provided with a terminal as described later. Figure 1 and Figure 2 The current detection device 10 shown in the figure has a plurality of bus bars 220 made of the same material and shape as the above-mentioned bus bars 21, 22, and 23 passing through the shell 11, and a plurality of magnetic sensors 230 are arranged on the circuit substrate 30 in the shell 11 in a manner corresponding to the plurality of bus bars 220, respectively, and the plurality of magnetic sensors 230 are respectively clamped by two shielding parts 41a and 41b opposed to each other in the upper and lower directions.

[0050] Figure 4 (a) Figure 4 As shown in (b), the bus bar 220 extends along the width direction (Y1-Y2 direction, see Figure 2 ) is a plate-like member extending in a strip shape and having a thickness in the vertical direction (Z1-Z2 direction), and is composed of Figure 1 and Figure 2 The busbars 21 , 22 , 23 shown are made of the same material.

[0051] like Figure 4 As shown in (a), the magnetic sensor 230 has a substantially rectangular shape in a top view observed in the vertical direction (Z1-Z2 direction), and includes: a main body 231 having a thickness in the vertical direction; and a plurality of terminals 232a, 232b extending outward from side surfaces 231as, 231bs of the main body 231 that are opposite to each other in the X1-X2 direction. The main body 231 detects an induced magnetic field generated by a current (measured current) flowing in the bus bar 220 that is opposite to the main body 231, thereby measuring the current value of the measured current and outputting the current value as a detection signal. Both the magnetic sensor 230 and the bus bar 220 have a thickness in the vertical direction, and in the following description, the state observed in the thickness direction is referred to as a top view.

[0052] The main body portion 231 has a first region 231 a which is a portion overlapping with the bus bar 220 in a plan view as viewed in the thickness direction, and a second region 231 b which is a portion not overlapping with the bus bar 220 .

[0053] A plurality of terminals 232a are extended outward from the side surface 231as of the first region 231a along the width direction of the bus bar 220. The plurality of terminals 232a extend outwardly so as to overlap with the bus bar 220 when viewed from above. On the other hand, a plurality of terminals 232b are extended outwardly from the side surface 231bs of the second region 231b along the width direction of the bus bar 220. The plurality of terminals 232b extend outwardly so as not to overlap with the bus bar 220 when viewed from above. That is, the plurality of terminals 232b extend in a direction away from the bus bar 220.

[0054] The plurality of terminals 232b extending from the second region 231b include a signal terminal for outputting a detection signal detected in the main body 231 and a power terminal for supplying power to the main body 231. The signal terminal and the power terminal are not provided in the plurality of terminals 232a extending from the first region 231a. That is, the signal terminal and the power terminal are extended in a direction orthogonal to the extending direction of the bus bar 220 only from one side 231bs of the two side surfaces 231as and 231bs of the main body 231 that are opposite to each other and that does not overlap with the bus bar 220 when viewed from above. In addition, terminals other than the signal terminal and the power terminal, for example, terminals for calibrating the detection signal before shipment, may also extend from either of the above-mentioned side surfaces 231as and 231bs.

[0055] In a plan view, the plurality of terminals 232b including the signal terminals and the power terminals extend outward from the second region 231b of the main body 231 which is a portion not overlapping with the bus bar 220, so as not to overlap with the bus bar 220. Thus, since the plurality of terminals 232b are not opposed to the bus bar 220 in the thickness direction, the distance from the bus bar 220 can be made larger than in the case of being opposed. Therefore, the influence of the noise generated from the bus bar 220 when switching on / off the voltage for controlling the measured current flowing in the bus bar 220 can be suppressed, for example, the noise can be suppressed from being carried on the signal terminal and affecting the mounted parts on the circuit board 30 electrically connected to the signal terminal.

[0056] In addition, since the signal terminal and the power terminal are provided only on one side 231bs of the two opposite side surfaces 231as and 231bs of the main body 231, the effect of suppressing the influence of the noise generated from the bus bar 220 can be maintained, and the range opposite to the first area 231a can be expanded and the bus bar 220 can be expanded from the range in the direction away from the multiple terminals 232b (X2 direction).

[0057] In addition, if Figure 2 (a) Figure 2As shown in (b), the circuit board 30 provided with the magnetic sensor 230 is sandwiched by two shielding members 41a and 41b facing each other from top to bottom. Thus, the magnetic sensor 230 on the circuit board 30 is sandwiched from top to bottom by the first shielding member 41a and the second shielding member 41b, so that the external magnetic field such as the induced magnetic field generated by the current flowing in the adjacent bus bar is shielded, and its influence is suppressed to a small extent.

[0058] Figure 5 This is a side view showing the arrangement of the two shielding members 41a, 41b, the magnetic sensor 230, and the bus bar 220 in the current detection device of the modified example of the second embodiment, and each component is briefly shown. For the main body 231 of the magnetic sensor 230, the size of the first area 231a and the second area 231b can be arbitrarily set in the width direction (X1-X2 direction) of the bus bar 220, but as shown in FIG. Figure 5 As shown, if the plane center 233 of the main body 231 is configured to be located on the end face 221 in the width direction of the busbar 220, and the plane center 233 is configured to be consistent with the common plane center 40x of the two shielding members 41a and 42b, the effect of reliably suppressing the influence of the external magnetic field and the accurate measurement of the current value based on the induced magnetic field generated by the current flowing in the busbar 220 can be obtained in a well-balanced manner.

[0059] <Third embodiment>

[0060] Figure 6 FIG. 3 is a plan view showing the positional relationship among the bus bar 320 , the magnetic sensor 330 , and the circuit board 30 according to the third embodiment. Figure 6 , the shapes of the bus bar 320 , the magnetic sensor 330 , and the circuit board 30 are simply shown, and mounted components other than the magnetic sensor 330 on the circuit board 30 are omitted.

[0061] In a third embodiment, for Figure 1 and Figure 2 The current detection device 10 shown in FIG. Figure 6 As shown, a bus bar 320 and a magnetic sensor 330 are arranged, and have a size relationship as described below. The magnetic sensor 330 is provided with a terminal as described later. In addition, the bus bar 320 has a base 321 and two extended end portions 322 and 323. The other configurations are the same as Figure 1 and Figure 2The current detection device 10 shown in the figure has a plurality of bus bars 320 made of the same material and shape as the above-mentioned bus bars 21, 22, and 23 passing through the shell 11, and a plurality of magnetic sensors 330 are arranged on the circuit substrate 30 in the shell 11 in a manner corresponding to the plurality of bus bars 320, respectively, and the plurality of magnetic sensors 330 are respectively clamped by two shielding parts 41a and 41b opposed to each other in the upper and lower directions.

[0062] like Figure 6 As shown, the busbar 320 includes: a base 321 extending in a strip-like shape in a direction along the width direction of the circuit substrate 30 (Y1-Y2 direction); and two extended end portions 322, 323 extending in a strip-like shape from both ends of the base 321 in the extending direction (Y1-Y2 direction) and in the extending direction (X1-X2 direction) of the circuit substrate 30 toward the X1 side. The base 321 extends in a manner perpendicular to the extending direction of the circuit substrate 30, and extends as a portion overlapping with a first region 331a, which is a part of the main body 331 of the magnetic sensor 330. The two extended end portions 322, 323 extend on both sides of the long dimension direction of the base 321 in a direction different from the extending direction of the base 321 of the busbar 320 and perpendicular to the extending direction. The busbar 320 is a plate-like component having a thickness in the up-down direction (Z1-Z2 direction), and is composed of Figure 1 and Figure 2 The busbars 21 , 22 , 23 shown are made of the same material.

[0063] Here, the extending direction of the extended end portions 322 and 323 is a direction different from the extending direction of the base portion 321 of the bus bar 320, and any direction is sufficient as not to approach the main body portion 331, and may be extended in a direction that is not orthogonal to the extending direction of the base portion 321 of the bus bar 320. In addition, like the extended end portions 322 and 323, they may be extended not only to the X1 side but also to the X2 side. That is, the so-called direction not approaching the main body portion 331 is, for the extended end portion 322, the direction is from the X1 side to the X2 side in the clockwise direction. Figure 6 In the range from the Y2 direction to the X1 direction shown in the figure, if the end portion 323 is extended, the direction is from the Y2 direction to the X1 direction in the clockwise direction. Figure 6 The range from the X1 direction to the Y1 direction shown. Moreover, as long as the distance from the main body 331 is constant or the direction is away from the main body 331, it does not need to be a strip shape along a certain direction, for example, it can be set to a rectangular shape with four sides in the X1-X2 direction and the Y1-Y2 direction.

[0064] The magnetic sensor 330 has the same shape and function as the magnetic sensor 230 of the second embodiment, and includes: a main body 331 having a substantially rectangular shape and having thickness in the up-down direction; and a plurality of terminals 332a, 332b extending outwardly in the X1-X2 direction from the opposing side surfaces of the main body 331. The main body 331 has a first region 331a which is a portion overlapping with the base 321 of the bus bar 320 in a plan view along the thickness direction, and a second region 331b which is a portion not overlapping with the base 321 of the bus bar 320.

[0065] The plurality of terminals 332a and 332b are respectively arranged similarly to the plurality of terminals 232a and 232b of the second embodiment. In a plan view, the plurality of terminals 332a are extended to overlap with the base 321 of the bus bar 320, and the plurality of terminals 332b are extended to not overlap with the base 321 of the bus bar 320. Similar to the second embodiment, the plurality of terminals 332b extending from the second region 331b include a signal terminal for outputting a detection signal detected in the main body 331 and a power supply terminal for supplying power to the main body 331. The signal terminal and the power supply terminal are not provided in the plurality of terminals 332a extending from the first region 331a.

[0066] By providing the extended ends 322 and 323 , the effect of suppressing the influence of noise generated from the bus bar 320 can be maintained, and the overall area of ​​the bus bar 320 can be increased, thereby reducing the resistance of the entire bus bar 320 and suppressing heat generation.

[0067] In addition, other operations, effects, and modifications are the same as those of the second embodiment.

[0068] 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 improvements or changes can be made within the scope of the purpose of improvement or the idea of ​​the present invention.

[0069] Industrial Applicability

[0070] As described above, the magnetic sensor of the present invention and the current detection device including the magnetic sensor are useful in that even when noise is generated from the bus bar when switching on / off the voltage for controlling the measured current flowing in the bus bar, the influence on the measurement result of the magnetic sensor can be suppressed to a small extent.

[0071] Description of Reference Numerals

[0072] 10 Current detection device

[0073] 11 Housing

[0074] 11a Cover part

[0075] 11b Housing parts

[0076] 21, 22, 23 Busbars

[0077] 30 Circuit board

[0078] 31, 32, 33 Magnetic sensor

[0079] 41a First shielding member (magnetic shielding member)

[0080] 41b Second shielding member (magnetic shielding member)

[0081] 40x Plane Center

[0082] 120 Busbar

[0083] 130 Magnetic Sensor

[0084] 131 Main body

[0085] 131a First area (the part overlapping with the bus bar)

[0086] 131b Second area (part not overlapping with bus bar)

[0087] 131c The third area (the part not overlapping with the bus bar)

[0088] 132a, 132b terminals

[0089] 220 Busbar

[0090] 221 End face

[0091] 230 Magnetic Sensor

[0092] 231 Main body

[0093] 231a First area (the part overlapping with the bus bar)

[0094] 231as Side

[0095] 231b Second area (part not overlapping with bus bar)

[0096] 231bs Side

[0097] 232a, 232b terminals

[0098] 233 plane center

[0099] 320 Busbar

[0100] 321 base

[0101] 322, 323 Extension end

[0102] 330 Magnetic Sensor

[0103] 331 Main body

[0104] 331a First area (the part overlapping with the bus bar)

[0105] 331b Second area (part not overlapping with bus bar)

[0106] 332a, 332b terminals

Claims

1. A current detection device, comprising: a bus bar in the form of a plate; and The magnetic sensor comprises a main body capable of measuring the current flowing in the bus bar and terminals extending from two mutually opposing side surfaces of the main body. It is characterized in that The terminal includes a signal terminal for outputting a detection signal and a power terminal for supplying power to the main body. The signal terminal and the power terminal extend from the main body. The main body has a portion overlapping with the bus bar and a portion not overlapping with the bus bar when viewed along the thickness direction of the bus bar, and the signal terminal and the power terminal extend from the portion of the main body not overlapping with the bus bar in a manner not overlapping with the bus bar. The current detection device further includes two plate-shaped magnetic shields, which are arranged to be separated from each other in the thickness direction so as to sandwich the bus bar and the magnetic sensor and are formed in the same shape and size. The two plate-shaped magnetic shields are respectively arranged parallel to the bus bar and overlapped so as not to be exposed to each other when viewed in the thickness direction. The main body and the two magnetic shields are arranged so that centers of their planes coincide with each other when viewed in the thickness direction, and the center of the main body is located on an end surface of the bus bar in the width direction.

2. The current detection device according to claim 1, wherein: The bus bar extends in a strip shape. The signal terminal and the power terminal are arranged only on one side of the side surface of the main body in a width direction perpendicular to the extending direction of the bus bar. The one side of the main body portion is arranged at a position not overlapping with the bus bar in a width direction of the bus bar when viewed in the thickness direction.

3. The current detection device according to claim 2, wherein: When observed along the thickness direction of the bus bar, the bus bar extends in a direction different from the extending direction of the bus bar and away from the main body on both sides of the portion overlapping with the main body in the extending direction of the bus bar, or extends in a direction different from the extending direction of the bus bar and at a constant distance from the main body.

Images