Control device

Abstract

To provide a control device that improves assembly accuracy of a current sensor and a bus bar and improves detection accuracy of a current value flowing through the bus bar.SOLUTION: A control device 1 includes a bus bar for energization, a substrate, a magnetic detection type current sensor, a case 30, and a base member 20. The control device is mounted on the substrate. The current sensor is attached to a position close to the bus bar of the substrate, and detects a magnetic field caused by a current flowing through the bus bar. The case 30 houses the substrate and the bus bar. The case 30 is fixed to the base member 20. The bus bar is partially embedded and fixed in the case 30. The substrate is directly fixed to the base member 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a control device. [Background technology]

[0002] A known motor drive control device converts DC power supplied from a battery into AC power and drives the motor with the converted AC power. Such control devices must accurately detect the current flowing through the motor and the input current from the battery in order to control the current flowing through the motor and to perform fail-stops in the event of an overcurrent. To address this issue, a current sensor is installed around the bus bar (electrode) that carries the current and is connected to the power control circuit.

[0003] The current sensor has a magnetic core and a Hall element (magnetic detection element) placed around the bus bar for carrying current that is connected to the power control circuit. This current sensor uses the magnetic core to amplify the magnetic field generated by the current flowing through the bus bar, and then uses the Hall element to detect the magnetic field amplified by the magnetic core.

[0004] However, a current sensor having a structure in which a magnetic core and a Hall element are arranged around a current-carrying bus bar increases the size of the entire device due to the magnetic core, and also increases manufacturing costs. As a countermeasure, coreless current detection has been studied in recent years, which detects the magnetic field generated around the electrode using only a magnetic detection element such as a Hall element, without providing a magnetic core (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-195381 Summary of the Invention [Problem to be solved by the invention]

[0006] However, because the coreless current detection described in Patent Document 1 directly detects magnetic flux, even a slight change in the distance between the magnetic detection element and the current-carrying bus bar causes large fluctuations in the detected current value. For this reason, when assembling the current sensor (magnetic detection element) and bus bar into the case of the control device, it is desirable to minimize assembly errors and make the distance (air gap) between the current sensor and bus bar as small as possible. Even if there is some variation in the distance between the current sensor and the bus bar, the effect of this variation on the detection results can usually be eliminated by adjusting (calibrating) the current value conversion program after assembling the current sensor and the bus bar in the case. However, if the variation in the distance between the current sensor and the bus bar is too large, it becomes difficult to properly perform initial setting by adjusting the current value conversion program.

[0007] Therefore, the present invention provides a control device that improves the assembly accuracy of the current sensor and the bus bar, and improves the detection accuracy of the value of the current flowing through the bus bar. [Means for solving the problem]

[0008] In order to solve the above problems, in a first aspect of the present invention, a control device includes a bus bar for conducting current, a circuit board on which a control device is mounted, a magnetic detection current sensor attached to the circuit board in close proximity to the bus bar and detecting a magnetic field caused by a current flowing through the bus bar, a case that houses the circuit board and the bus bar, and a base member to which the case is fixed, wherein a portion of the bus bar is embedded and fixed in the case, and the circuit board is directly fixed to the base member.

[0009] With this configuration, a portion of the bus bar is embedded in the case, becoming one with the case. As a result, when the case is fixed to the base member, the bus bar integrated with the case can be assembled to the base member with high precision. Furthermore, the board is directly fixed to the base member, and therefore assembled to the base member with high precision. Therefore, the bus bar and the board are assembled with high precision using the common base member as a reference, which reduces variation in the distance between the current sensor and the bus bar. This improves the assembly precision of the current sensor and the bus bar, and improves the detection precision of the current value flowing through the bus bar. Furthermore, by directly fixing the substrate to the base member, the support rigidity of the substrate is increased, making it less likely for the substrate to vibrate, thereby preventing fluctuations in the distance between the bus bar and the sensor due to vibration of the substrate.

[0010] In a second aspect of the present invention, in the control device of the first aspect, the case has an opening in a portion facing the board, and is characterized by comprising a case main body that covers the installation portion of the current sensor on the board and the outside of the bus bar, and a cover portion that is detachably attached to the case main body so as to close the opening.

[0011] With this configuration, after installing the current sensor and bus bar, an adjustment device for the current value conversion program can be connected to the circuit board with the opening of the case body open. This allows the adjustment device connected to the circuit board to adjust the current value conversion program stored in an IC or the like on the circuit board to an appropriate value corresponding to the gap between the current sensor and the bus bar. After adjusting the current value conversion program in this way, the adjustment device is removed from the circuit board and the opening of the case body is closed. Therefore, when this configuration is adopted, it is possible to suppress a decrease in the detection accuracy of the current sensor caused by variations in the distance between the current sensor and the bus bar.

[0012] A third aspect of the present invention is characterized in that, in the control device of the first or second aspect, the current sensor is provided opposite the bus bar, and the portion of the bus bar that is embedded and fixed in the case is located in close proximity to the current sensor.

[0013] With this configuration, the area of ​​the bus bar near the embedded fixed part, which is supported by the case with high rigidity, becomes the area to be detected by the magnetic field by the current sensor, which makes it easier to maintain a constant distance between the detection area of ​​the bus bar and the current sensor.

[0014] In a fourth aspect of the present invention, in a control device of any of the first to third aspects, the base member is provided with a support portion that protrudes toward the substrate and to which the substrate is fixed, and an end of the substrate in the extension direction has a fixing portion to which the support portion is fixed, and the current sensor is arranged in the vicinity of the fixing portion.

[0015] With this configuration, the end of the substrate in the extension direction is supported by the base member via the support pillar. When external vibrations are input to the substrate, the amplitude of the vibration in the central region tends to increase. In contrast, the vibration of the fixed portion at the end of the substrate in the extension direction is easily suppressed by the support pillar, and the fixed portion does not vibrate with a large amplitude even when external vibrations are input. Therefore, even when external vibrations are input, the current sensor disposed near the fixed portion at the end of the substrate in the extension direction does not vibrate significantly. Therefore, when this configuration is adopted, it is possible to further suppress fluctuations in the distance between the bus bar and the current sensor. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a control device that improves the assembly accuracy of the current sensor and the bus bar and improves the detection accuracy of the value of the current flowing through the bus bar. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a perspective view showing a control device according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the control device according to the embodiment of the present invention. [Figure 3] FIG. 2 is a perspective view of the control device according to the embodiment of the present invention with the case removed. [Figure 4] 4 is a plan view of the control device according to the embodiment of the present invention with the substrate removed from FIG. 3. FIG. [Figure 5] 1 is a perspective view of a control device according to an embodiment of the present invention, with a case and a circuit board removed. [Figure 6] 6 is a cross-sectional view of the control device according to the embodiment of the present invention taken along line VI-VI in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a control device 1. Fig. 2 is an exploded perspective view of the control device 1. The control device 1 has an inverter function that converts DC power supplied from a battery (not shown) into AC power and drives a motor (not shown) (AC motor) with the converted AC power.

[0019] 1 and 2, the control device 1 includes a case 30, a metal base member 20 formed by aluminum die-casting or the like, a second board 14 (board) on which control devices are mounted, and a plurality of bus bars (battery-side bus bars 17A and 17B, motor-side bus bars 18A, 18B, and 18C). The base member 20 is a member to which the case 30 accommodating the plurality of devices is attached. A plurality of fins 20a for heat dissipation are protruded from the outer surface of the base member 20. In the following description, for convenience of explanation, the side of the base member 20 on which the plurality of fins 20a are protruding will be referred to as the "bottom" side, and the opposite side will be referred to as the "top" side.

[0020] The case 30 includes a case body 32 having a rectangular opening 32a, and a cover part 31 that is detachably attached to the top surface of the case body 32 so as to close the opening 32a. A seal member 33 that seals the gap between the cover part 31 and the case body 32 is provided between the cover part 31 and the opening 32a. The main parts of the case body 32 and the cover part 31 are formed from a resin material. The cover part 31 is detachably attached to the case main body 32. The cover part 31 has a top surface part 31a that faces upward and side surface parts 31b that face in directions (four directions) perpendicular to the top surface part 31a. The top surface part 31a has insertion holes 50a formed at the four corners of the top surface part 31a when viewed from above, through which bolts 50 are inserted. The side surface parts 31b have steps that are approximately right-angled.

[0021] The case body 32 includes a main body block portion 32b having a rectangular frame shape when viewed from above, and a bus bar support portion 32c connected to one side of the main body block portion 32b. The main body block portion 32b has an opening portion 32a that opens upward. The main body block portion 32b has insertion holes 50b formed at its four corners when viewed from above, through which bolts 50 are inserted. The shafts of the bolts 50 are inserted into the insertion holes 50a, 50b at the four corresponding corners of the cover part 31 and the case body 32, and are screwed into the case body 32 from above the cover part 31. In this way, the cover part 31 is fastened and fixed to the case body 32.

[0022] The busbar support portion 32c supports one end of each of the multiple busbars (battery-side busbars 17A and 17B and motor-side busbars 18A, 18B, and 18C). The busbar support portion 32c supports the lower surfaces of the terminal fixing portions (17Aa, 17Ba, 18Aa, 18Ba, and 18Ca (see FIGS. 4 and 5)) of the multiple busbars, which will be described later. Portions of the busbar support portion 32c that support the terminal fixing portions 17Aa, 17Ba, 18Aa, 18Ba, and 18Ca are raised upward. These raised portions are hereinafter referred to as "raised portions 90." The multiple raised portions 90 are spaced apart at regular intervals, and recesses 91 are provided between adjacent raised portions 90.

[0023] The peripheral wall of main body block 32b is provided with embedded portions 34 adjacent to each raised portion 90, in which a portion of each of the bus bars (battery-side bus bars 17A, 17B and motor-side bus bars 18A, 18B, 18C) is embedded and fixed by molding (see FIG. 6). Each bus bar penetrates the peripheral wall of main body block 32b at embedded portions 34.

[0024] FIG. 3 is a perspective view of the control device 1 with the case 30 removed. FIG. 4 is a plan view of the control device 1 with the cover 31 removed. FIG. 5 is a perspective view of the control device 1 with the case 30 and second substrate 14 removed. As shown in FIGS. 3, 4, and 5, a first substrate 11 and a plurality of electrolytic capacitors 12 (see FIG. 5) are arranged on the upper surface of the base member 20. In addition, a plurality of support columns 13A, 13B, and 13C protrude upward from the base member 20. A second substrate 14 is supported on the upper portions of the plurality of support columns 13A, 13B, and 13C. The second substrate 14 is arranged above the first substrate 11 and the plurality of electrolytic capacitors 12 so as to be approximately parallel to the first substrate 11. As shown in FIG. 3, the first substrate 11 is arranged near one side of the upper surface of the base member 20, which is approximately rectangular in plan view, and the plurality of electrolytic capacitors 12 are arranged near the other side of the upper surface of the base member 20.

[0025] As shown in FIG. 4, the case main body 32 (case 30) is fixed to the base member 20 by fixing screws 45 at two locations spaced apart in the Y direction of the busbar support portion 32c, and by fixing screws 51 at two locations spaced apart in the Y direction of the main body block portion 32b.

[0026] The first substrate 11 is a printed circuit board (PWB) on which a plurality of electronic components including switching elements 15 are mounted. A plurality of switching elements 15 are combined together to form the main part of a power control circuit 16 together with the electrolytic capacitor 12. The power control circuit 16 performs ON / OFF operation by controlling the switching elements 15 using a control unit (not shown), thereby converting the DC power of the battery into three-phase AC power.

[0027] A pair of battery-side bus bars 17A, 17B, which are electrodes for supplying current to the battery, and three motor-side bus bars 18A, 18B, 18C, which are electrodes for supplying current to the motor, are connected to the power control circuit 16. The pair of battery-side bus bars 17A, 17B can be connected to the negative and positive poles of the battery via connection cables (not shown). The three motor-side bus bars 18A, 18B, 18C can be connected to the U-phase, V-phase, and W-phase power supply parts of the motor via connection cables (not shown).

[0028] The electrolytic capacitor 12 disposed near the other side of the upper surface of the base member 20 is formed in a substantially cylindrical shape. The plurality of electrolytic capacitors 12 are arranged in parallel in a direction perpendicular to the longitudinal direction (axial direction). The plurality of electrolytic capacitors 12 are connected to the circuit on the first substrate 11 via connection bus bars 19A and 19B surface-mounted on the first substrate 11. Hereinafter, the direction along the longitudinal direction (axial direction) of the electrolytic capacitors 12 will be referred to as the X direction. The direction in which the electrolytic capacitors 12 are arranged in parallel will be referred to as the Y direction, and the direction perpendicular to the X and Y directions will be referred to as the Z direction. Arrows indicating the X direction, Y direction, and Z direction are shown at appropriate positions in the drawings.

[0029] Fig. 6 is a cross-sectional view of the control device 1 taken along line VI-VI in Fig. 4. On the upper surface of the first substrate 11, a negative side circuit terminal and a positive side circuit terminal (not shown) are mounted, which are connected to the negative side battery side bus bar 17A and the positive side battery side bus bar 17B, respectively.

[0030] Each of the battery-side busbars 17A, 17B is formed from a long, conductive metal plate. One longitudinal end of each battery-side busbar 17A, 17B penetrates the peripheral wall of one X-direction end of the main body block portion 32b and is supported on the corresponding raised portion 90 of the busbar support portion 32c. This portion serves as a terminal fixing portion 17Aa, 17Ba. The other longitudinal end of each battery-side busbar 17A, 17B serves as a circuit fixing portion 17Ab, 17Bb connected to the negative and positive circuit terminals on the first circuit board 11. The portions of the terminal fixing portions 17Aa, 17Ba that are positioned inward in the X direction and penetrate the main body block portion 32b serve as wavy portions 17Ac, 17Bc that are embedded and fixed in the embedded portion 34 of the main body block portion 32b (case 30). The wavy portions 17Ac and 17Bc have a large number of grooves formed along the Y direction on both upper and lower surfaces (both surfaces in the Z direction), and continuous wave-shaped irregularities are formed on both side edges in the Y direction.

[0031] Higher extending portions 17Ad, 17Bd extend horizontally from the wavy portions 17Ac, 17Bc of each battery-side busbar 17A, 17B inward in the X direction. The ends of the higher extending portions 17Ad, 17Bd in the extending direction are bent downward and connected to the circuit fixing portions 17Ab, 17Bb. The higher extending portions 17Ad, 17Bd are disposed higher than the circuit fixing portions 17Ab, 17Bb. The higher extending portions 17Ad, 17Bd are disposed at a height such that their upper surfaces are close to the lower surface of the second board 14.

[0032] The terminal fixing portions 17Aa, 17Ba and the wavy portions 17Ac, 17Bc of the battery-side busbars 17A, 17B are fixed to the case body 32 so that the longitudinal direction thereof is along the X direction. The wavy portions 17Ac, 17Bc are embedded and fixed to the case body 32 by embedding portions 34. The circuit fixing portions 17Ab, 17Bb of the battery-side busbars 17A, 17B are fixed to the base member 20 by bolts 52 that pass through the first board 11 in the vertical direction.

[0033] Furthermore, three output circuit terminals (not shown) for the U phase, V phase, and W phase, which are power output sections to the motor, are mounted on the upper surface of first substrate 11. These output circuit terminals are arranged in the central region in the Y direction of first substrate 11, spaced apart approximately evenly in the Y direction. Motor side bus bars 18A, 18B, and 18C, which are current-carrying electrodes, are connected to each of these output circuit terminals.

[0034] Like the battery-side busbars 17A and 17B, the motor-side busbars 18A, 18B, and 18C are formed from long, conductive metal plates. One longitudinal end of each of the motor-side busbars 18A, 18B, and 18C penetrates the peripheral wall of one X-direction end of the main body block portion 32b and is supported on a corresponding raised portion 90 of the busbar support portion 32c. This portion serves as a terminal fixing portion 18Aa, 18Ba, and 18Ca. The other longitudinal end of each of the motor-side busbars 18A, 18B, and 18C serves as a circuit fixing portion 18Ab, 18Bb, and 18Cb that is connected to the output-side circuit terminals on the first circuit board 11. The portions of the terminal fixing portions 18Aa, 18Ba, 18Ca disposed inside in the X direction and penetrating through the main body block portion 32b are wavy portions 18Ac, 18Bc, 18Cc that are embedded and fixed in the main body block portion 32b (case 30). The wavy portions 18Ac, 18Bc, 18Cc have a large number of grooves formed along the Y direction on both the upper and lower surfaces (the surfaces on both sides in the Z direction), and continuous wave-shaped irregularities are formed on both side edges in the Y direction.

[0035] Higher extending portions 18Ad, 18Bd, 18Cd extend horizontally from the wavy portions 18Ac, 18Bc, 18Cc of the motor-side bus bars 18A, 18B, 18C inward in the X direction. The ends of the higher extending portions 18Ad, 18Bd, 18Cd in the extending direction are bent downward and connected to the circuit fixing portions 18Ab, 18Bb, 18Cb. The higher extending portions 18Ad, 18Bd, 18Cd are positioned higher than the circuit fixing portions 18Ab, 18Bb, 18Cb. The higher extending portions 18Ad, 18Bd, 18Cd are positioned at a height such that their upper surfaces are close to the lower surface of the second substrate 14.

[0036] Terminal fixing portions 18Aa, 18Ba, 18Ca and wavy portions 18Ac, 18Bc, 18Cc of motor-side bus bars 18A, 18B, 18C are fixed to case body 32 so that the longitudinal direction thereof is along the X direction. Wavy portions 18Ac, 18Bc, 18Cc are embedded and fixed to case body 32 by embedded portions 34. Circuit fixing portions 18Ab, 18Bb, 18Cb of motor-side bus bars 18A, 18B, 18C are fixed to base member 20 by bolts 52 that penetrate first board 11 in the up-down direction.

[0037] The three motor-side bus bars 18A, 18B, and 18C are arranged side by side in a row along the Y direction. The three motor-side bus bars 18A, 18B, and 18C are arranged at equal intervals in the Y direction. One battery-side bus bar 17A is arranged adjacent to one end of the three motor-side bus bars 18A, 18B, and 18C on the outer side in the arrangement direction, and the other battery-side bus bar 17B is arranged adjacent to the other end of the three motor-side bus bars 18A, 18B, and 18C on the outer side in the arrangement direction. Therefore, the pair of battery-side bus bars 17A and 17B and the three motor-side bus bars 18A, 18B, and 18C are arranged side by side in a row along the Y direction. Terminal fixing portions 17Aa, 17Ba, 18Aa, 18Ba, 18Ca of battery side bus bars 17A, 17B and motor side bus bars 18A, 18B, 18C are arranged in a line along the Y direction at one end in the X direction.

[0038] The second substrate 14 is a printed wiring board (PWB) on which electronic components are mounted. The circuit printed on the second substrate 14 is connected to the circuit on the first substrate 11 via an inter-board connector 21 (see FIG. 5). A signal connector 22 is held between the case body 32 and the cover part 31. A plurality of signal terminals protruding from the signal connector 22 are also connected to the circuit on the second substrate 14.

[0039] The second substrate 14 is formed in a substantially rectangular shape as shown in Figures 2 and 3. One edge of the second substrate 14 in the X direction is fixed to a pair of support columns 13A protruding from the base member 20. The pair of support columns 13A are spaced apart in the Y direction and each penetrates the second substrate 14 in the up-down direction. One edge of the second substrate 14 in the X direction is placed on the upper surface of each support column 13A. In this state, the one edge of the second substrate 14 in the X direction is fastened to the upper end of each support column 13A by a fixing screw 45.

[0040] The other side in the X direction of second substrate 14 is fixed to two pairs of support columns 13B, 13C protruding from base member 20. The edge of second substrate 14 on the other side in the X direction is placed on the upper surfaces of the pair of support columns 13C and, in this state, is fixed to the upper ends of each support column 13C by fixing screws 46. In addition, another pair of support columns 13B penetrate second substrate 14 in the vertical direction and, in this state, are fitted into fitting holes 23 of second substrate 14.

[0041] Three Hall ICs 40, each having a built-in Hall element that is a magnetic detection element, are attached to the underside of the second substrate 14 near one side in the X direction (the end in the extending direction). One Hall IC 40 is disposed below the second substrate 14 so as to face the higher extension 17Ad of one of the battery-side busbars 17A (e.g., the busbar on the negative pole side). This Hall IC 40 faces the upper surface of the higher extension 17Ad of the battery-side busbar 17A with a small gap between them. This Hall IC 40 detects the magnetic force generated by the direct current of the battery when that current flows through the battery-side busbar 17A. The detection circuit calculates the value of the current flowing through the battery-side busbar 17A based on the detected magnetic force.

[0042] The other Hall IC 40 is disposed below the second substrate 14 so as to face the higher extension 18Ad of the motor-side bus bar 18A at one end in the arrangement direction. This Hall IC 40 faces the upper surface of the higher extension 18Ad of the motor-side bus bar 18A with a small gap between them. When AC current flows from the power control circuit 16 to the motor-side bus bar 18A, this Hall IC 40 detects the magnetic force generated by the current. The detection circuit calculates the value of the current flowing through the motor-side bus bar 18A based on the detected magnetic force.

[0043] The remaining Hall IC 40 is disposed below the second substrate 14, facing the higher extension 18Cd of the motor-side bus bar 18C at the other end of the arrangement direction. This Hall IC 40 faces the upper surface of the higher extension 18Cd of the motor-side bus bar 18C, with a small gap between them. When AC current flows from the power control circuit 16 to the motor-side bus bar 18C, this Hall IC 40 detects the magnetic force generated by the current. The detection circuit calculates the value of the current flowing through the motor-side bus bar 18C based on the detected magnetic force.

[0044] In this embodiment, there is no Hall IC 40 for detecting the current flowing through the central motor-side bus bar 18B. The current value of the current flowing through the central motor-side bus bar 18B is calculated based on the detected values ​​of the currents flowing through the motor-side bus bars 18A and 18C on both sides. In this embodiment, the Hall IC 40 attached to the lower surface of the second substrate 14 constitutes a magnetic detection type current sensor.

[0045] In this embodiment, the Hall IC 40 is used, in which a Hall element and an amplifier circuit are packaged. However, the Hall element and the amplifier circuit may be configured separately. In this case, at least the Hall element is disposed close to the corresponding bus bar. Furthermore, the Hall IC 40 is not limited to a Hall element. The Hall IC 40 may be any other element that can detect a magnetic field caused by a current flowing through the corresponding bus bar.

[0046] Here, the installation portions of the three Hall ICs 40 are all arranged near the fixed portions 14a of the support portions 13A on the edge (end in the extension direction) of the second substrate 14. In the present embodiment, the fixed portions 14a on the edge of the second substrate 14 are formed by portions that are clamped between the upper end faces of the support portions 13A and the heads of the fixing screws 45. The three Hall ICs 40 arranged on the edge of the second substrate 14 are arranged side by side in a row along the edge (along the Y direction).

[0047] The positional relationship of each support portion 13A with respect to the bus bar is as follows. One support column 13A is disposed at a substantially midpoint between the motor-side bus bar 18A at one end in the arrangement direction and one battery-side bus bar 17A adjacent to the motor-side bus bar 18A. Therefore, the Hall IC 40 disposed opposite the upper surface of the high extension portion 18Ad of the motor-side bus bar 18A and the Hall IC 40 disposed opposite the upper surface of the high extension portion 17Ad of the battery-side bus bar 17A are disposed at substantially the same distance from the fixed portion 14a of the one support column 13A.

[0048] The other support pillar 13A is disposed at a substantially midpoint between the motor-side bus bar 18C at the other end in the arrangement direction and the other battery-side bus bar 17B adjacent to the motor-side bus bar 18C. The Hall IC 40 disposed opposite the upper surface of the high extension portion 18Cd of the motor-side bus bar 18C and the Hall IC 40 disposed opposite the upper surface of the high extension portion 18Ad of the motor-side bus bar 18A are disposed at substantially the same distance from the fixed portion 14a of the other support pillar 13A.

[0049] These distances (the distances from each fixed portion 14a to the adjacent Hall IC 40) are set so that the vibration amplitude of the installation portion of the Hall IC 40 falls within an allowable range when external vibration is input. Here, the "allowable range" means that the detected value of the magnetic field (current) by the Hall IC 40 falls within an allowable error range. In this embodiment, the external input vibration is assumed to be input vibration when the control device 1 is mounted on a vehicle.

[0050] (Effects of the embodiment) As described above, in the control device 1 of this embodiment, the second board 14 (board), battery-side bus bars 17A and 17B, and motor-side bus bars 18A, 18B, and 18C (bus bars) are housed in the case 30, and the case 30 is fixed to the base member 20. In addition, portions of the battery-side bus bars 17A and 17B and motor-side bus bars 18A, 18B, and 18C (bus bars) are embedded and fixed in the case 30, and the second board 14 (board) is directly fixed to the base member 20.

[0051] In this configuration, wavy portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc of battery-side bus bars 17A and 17B and motor-side bus bars 18A, 18B, and 18C (bus bars) are embedded in embedded portions 34 of case main body 32 (case 30). Battery-side bus bars 17A and 17B and motor-side bus bars 18A, 18B, and 18C (bus bars) are integrated with case main body 32 (case 30) by the resin of embedded portions 34 flowing into multiple grooves formed along the Y direction in wavy portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc during molding. As a result, when case main body 32 is fixed to base member 20, the bus bars integrated with case main body 32 can be assembled to base member 20 with high precision.

[0052] The second substrate 14 (substrate) is directly fixed to two pairs of support posts 13A, 13C protruding from the base member 20. The upper ends of the support posts 13A, 13C are fastened with fixing screws 45, 46, thereby assembling the second substrate 14 with high precision to the base member 20. Therefore, the battery-side bus bars 17A, 17B and the motor-side bus bars 18A, 18B, 18C (bus bars) are each assembled with high precision using the common base member 20 as a reference. This reduces variations in the distance between the battery-side bus bars 17A, 17B and the motor-side bus bars 18A, 18B, 18C (bus bars) and the corresponding Hall ICs 40 (current sensors). This improves the assembly precision of the Hall ICs 40 and the bus bars, thereby improving the accuracy of detecting the current flowing through the bus bars.

[0053] Furthermore, by directly fixing second substrate 14 to support posts 13A and 13C of base member 20, the support rigidity of second substrate 14 is increased, making second substrate 14 less likely to swing. Therefore, fluctuations in the separation distances between battery-side bus bars 17A and 17B and motor-side bus bars 18A, 18B, and 18C (bus bars) and the corresponding Hall ICs 40 due to swinging of second substrate 14 can be suppressed.

[0054] Therefore, when the control device 1 of this embodiment is adopted, the detection accuracy of the current flowing through the battery-side busbars 17A and 17B and the motor-side busbars 18A, 18B, and 18C (busbars) can be stably improved, which makes it possible to contribute to Goal 7 of the United Nations-led Sustainable Development Goals (SDGs), "Ensure access to affordable, reliable, sustainable, and modern energy for all," and Goal 8, "Promote sustained, inclusive, and sustainable economic growth, full and productive employment, and decent work for all."

[0055] In the control device 1 of this embodiment, the case 30 includes a case main body 32 having an opening 32a facing the second circuit board 14, and a cover 31 detachably attached to the case main body 32. After the Hall IC 40, the battery-side busbars 17A and 17B, and the motor-side busbars 18A, 18B, and 18C (busbars) are installed, an adjustment device for the current value conversion program can be connected to the second circuit board 14 with the opening 32a of the case main body 32 open. The adjustment device connected to the second circuit board 14 can adjust the current value conversion program stored in an IC or the like on the second circuit board 14 to an appropriate value corresponding to the gap between the battery-side busbars 17A and 17B and the motor-side busbars 18A, 18B, and 18C (busbars) and the corresponding Hall IC 40. After adjusting the current value conversion program, the adjustment device is removed from the second circuit board 14, and the opening 32a of the case main body 32 is closed with the cover 31.

[0056] Therefore, when this configuration is adopted, after adjusting the current value conversion program, there is no need to fasten the case 30 to the base member 20. This makes it possible to suppress a decrease in the detection accuracy of the Hall ICs 40 caused by variations in the distances between the battery-side bus bars 17A, 17B and the motor-side bus bars 18A, 18B, 18C (bus bars) and the corresponding Hall ICs 40.

[0057] In the control device 1 of this embodiment, the Hall ICs 40 are provided facing the battery-side bus bars 17A and 17B and the motor-side bus bars 18A, 18B, and 18C (bus bars), respectively. The wavy portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc of each bus bar, which are directly embedded in the case 30, are located close to the Hall ICs 40. Therefore, the high-level extending portions 17Ad, 17Bd, 18Ad, 18Bd, and 18Cd connected to the wavy portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc of each bus bar, which are supported by the case 30 with high rigidity, are the target portions for detecting the magnetic field of the Hall ICs 40. This makes it easier to maintain a constant distance between the target portions of the bus bars and the Hall ICs 40.

[0058] In the control device 1 of this embodiment, the Hall IC 40 is disposed near the fixed portion 14a of the support 13A at the end of the second substrate 14 in the extension direction. Therefore, the end of the second substrate 14 in the extension direction is supported by the base member 20 via the support 13A. The amplitude of vibrations in the central region of the second substrate 14 is likely to increase when external vibrations are input. In contrast, the vibrations of the fixed portion 14a at the end edge of the second substrate 14 in the extension direction are easily suppressed by the support 13A, and the fixed portion 14a does not vibrate with a large amplitude even when external vibrations are input. Therefore, the Hall IC 40 disposed near the fixed portion 14a at the end edge of the second substrate 14 in the extension direction does not vibrate significantly even when external vibrations are input. Therefore, when this configuration is adopted, it is possible to further suppress fluctuations in the distance between the battery-side busbars 17A and 17B and the motor-side busbars 18A, 18B, and 18C (busbars) and the corresponding Hall ICs 40.

[0059] The present invention is not limited to the above embodiment, and various design modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, the Hall ICs 40 are arranged at positions facing the two motor-side bus bars 18A and 18C, respectively, but the Hall ICs 40 may be arranged at positions facing the three motor-side bus bars 18A, 18B, and 18C, respectively.

[0060] In the above embodiment, the power control circuit 16 is configured by the components mounted on the first substrate 11 and the electrolytic capacitor 12, but part of the power control circuit 16 may be provided on the second substrate .

[0061] In the above embodiment, the battery-side bus bars 17A, 17B and the motor-side bus bars 18A, 18B, 18C (bus bars) are all formed of long, conductive metal plates, but the bus bars are not limited to long, conductive metal plates. The bus bars may be, for example, linear or block-shaped, as long as they are capable of conducting electricity.

[0062] Furthermore, in the above embodiment, a pair of support pillars 13A are arranged to support the end of the second substrate 14 on the side where the Hall IC 40 is arranged, but the number of support pillars 13A is not limited to two. The number of support pillars 13A may be three or more, or may be one.

[0063] Furthermore, in the above embodiment, the opening 32a is provided so as to cover the second substrate 14, but the opening 32a may be provided in any size that allows connection of an adjustment device for the current value conversion program.

[0064] Furthermore, in the above embodiment, the circuit fixing portions 17Ab, 17Bb, 18Ab, 18Bb, and 18Cb are fixed to the base member 20 by bolts 52 that vertically penetrate the first substrate 11, but the means for fixing the circuit fixing portions 17Ab, 17Bb, 18Ab, 18Bb, and 18Cb is not limited to fastening with bolts 52. The circuit fixing portions 17Ab, 17Bb, 18Ab, 18Bb, and 18Cb may also be fixed to the base member 20 by soldering. [Explanation of symbols]

[0065] 1...control device, 11...first board, 12...electrolytic capacitor, 13A, 13B, 13C...support portion, 14...second board (board), 14a...fixing portion, 15...switching element, 16...power control circuit, 17A, 17B...battery side bus bar, 17Aa, 17Ba...terminal fixing portion, 17Ab, 17Bb...circuit fixing portion, 17Ac, 17Bc...wavy portion, 17Ad, 17Bd...high extension portion, 18A, 18B, 18C...motor side bus bar, 18Aa, 18Ba, 18Ca...terminal fixing portion, 18Ab, 18Bb, 18Cb...circuit fixing portion, 18Ac, 18Bc, 18Cc...wavy shaped portion, 18Ad, 18Bd, 18Cd...high extension portion, 19A, 19B...connection bus bar, 20...base member, 20a...fin, 21...board-to-board connector, 22...signal connector, 23...fitting hole, 30...case, 31...cover portion, 31a...top surface portion, 31b...side surface portion, 32...case main body, 32a...opening, 32b...main body block portion, 32c...bus bar support portion, 33...sealing member, 34...embedded portion, 40...Hall IC (current sensor), 45, 46...fixing screw, 50...bolt, 50a, 50b...through hole, 51...fixing screw, 52...bolt, 90...raised portion, 91...recessed portion

Claims

1. A bus bar for carrying current; a substrate on which a control device is mounted; a magnetic detection type current sensor attached to the circuit board at a position close to the bus bar and configured to detect a magnetic field caused by a current flowing through the bus bar; a case that accommodates the substrate and the bus bar; a base member to which the case is fixed; Equipped with The bus bar is partially embedded and fixed in the case, The substrate is directly fixed to the base member. A control device characterized by:

2. The case is a case body having an opening at a portion facing the circuit board and covering an installation portion of the current sensor on the circuit board and an outer side of the bus bar; a cover portion detachably attached to the case body so as to close the opening; Equipped with 2. The control device according to claim 1.

3. the current sensor is provided facing the bus bar, The portion of the bus bar that is embedded and fixed in the case is located in the vicinity of the current sensor.

3. The control device according to claim 1 or 2.

4. the base member includes a support portion that protrudes toward the substrate and to which the substrate is fixed, a fixing portion to which the support portion is fixed at an end portion in the extending direction of the substrate; The current sensor is disposed near the fixed portion.

2. The control device according to claim 1.

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