Electronic control device

Abstract

In this electronic control device (E1), capacitors, such as noise filter capacitors (53m) (53s) and smoothing capacitors (54m) (54s), which occupy a large mounting area, are disposed on a second side surface (412) of a connector base (41), but not on a circuit board (30). As a result, it is possible to reduce the mounting area of the circuit board (30) by an amount corresponding to the noise filter capacitors (53m) (53s) and smoothing capacitors (54m) (54s) disposed on the connector base (41), and to reduce the size of the electronic control device (E1).

Description

Technical Field

[0001] The present invention relates to an electronic control device. Background Art

[0002] As an example of a conventional electronic control device, for example, an electronic control device described in the following Patent Document 1 is known.

[0003] Briefly described, the electronic control device constitutes a so-called redundant system (dual system), and a smoothing capacitor of a power module constituting one of the dual systems is arranged on the outer side surface of a bus bar support arranged to overlap with a control substrate.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: (Japanese) Patent Publication No. 2020-188638 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] However, in the conventional electronic control device, the number of connector ports increases with the redundant system structure, while the area for connector placement decreases due to the installation of so-called filter components such as the smoothing capacitor, which is a disadvantage for miniaturization of the device, and there is room for improvement in this regard.

[0009] Therefore, the present invention has been made in view of the technical problems of the above-mentioned conventional electronic control devices, and an object of the present invention is to provide an electronic control device that can achieve miniaturization of the device.

[0010] Technical solutions for solving technical problems

[0011] In the present invention, as one aspect, the capacitor is mounted on the second side surface of the connector base that faces the power conversion circuit module or the power conversion circuit substrate.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to reduce the size of an electronic control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a longitudinal sectional view of the electronic control device according to the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 Enlarged view of the main part.

[0016] Figure 3This is another example of the first embodiment of the present embodiment. Figure 2 .

[0017] Figure 4 yes Figure 1 A-A line cross-sectional view.

[0018] Figure 5 yes Figure 1 BB line cross-sectional view.

[0019] Figure 6 yes Figure 1 C-C line cross-sectional view.

[0020] Figure 7 It is a longitudinal sectional view of an electronic control device according to a second embodiment of the present invention.

[0021] Figure 8 yes Figure 7 D-D line cross-sectional view.

[0022] Fig. 9 yes Figure 7 E-E line section view.

[0023] Fig.10 yes Figure 7 F-F line cross-sectional view.

[0024] Fig.11 is a first variation of the second embodiment of the present invention. Fig. 9 .

[0025] Fig.12 is a second variation of the second embodiment of the present invention. Fig. 9 . DETAILED DESCRIPTION

[0026] Hereinafter, an embodiment of the electronic control device of the present invention will be described in detail based on the accompanying drawings. It should be noted that in this embodiment, an example of applying the electronic control device of the present invention to an electric power steering device of an automobile, especially an example of a motor unit mounted on a power steering device having a redundant system (a dual system in this embodiment) is shown. In addition, the general electronic components constituting the redundant system are described by marking "m" or "s" at the end of the figure mark.

[0027] [First embodiment]

[0028] (Composition of electronic control device)

[0029] Figure 1FIG. 1 shows an electronic control device E1 according to a first embodiment of the present invention, and shows a longitudinal cross-sectional view of a motor unit MU formed by integrating the electronic control device E1 and the motor M, cut along the rotation axis Z direction of the motor M. Figure 1 In the description, for convenience of explanation, the side where the motor M is arranged in the axial direction is referred to as the “first end side Z1 ” and the side where the electronic control device E1 is arranged is referred to as the “second end side Z2 ”.

[0030] For example, Figure 1 As shown, the electronic control device E1 of the present embodiment is arranged in series on the second end side Z2 of the motor M, which is the object of control, and is formed as a so-called mechatronic unit with the motor M. Furthermore, the motor unit MU formed by the electronic control device E1 and the motor M is mounted on a power steering device (not shown), thereby generating an assist torque corresponding to the input torque input from the steering wheel (not shown), and assisting the steering operation of the driver.

[0031] The motor M is, for example, a three-phase AC brushless motor, and includes a motor housing 10 formed in a substantially cylindrical shape, a motor element (not shown) housed in the motor housing 10, and a motor rotating shaft 11 driven and rotated by the motor element. Power and a drive control signal are supplied to the motor M via an electronic control device E1 attached to the motor M, and the motor M is driven and controlled based on the power and drive control signal supplied via the electronic control device E1.

[0032] The motor housing 10 is formed into a generally cylindrical shape by a metal material with good heat dissipation, such as an aluminum alloy material, and has a storage space extending along the axial direction and having a generally circular cross-section inside. In addition, the motor housing 10 is provided with an ECU connection portion 101 formed by step-like reduction in diameter toward the first end side Z1 at the end opposite to the electronic control device E1. The first housing 21 of the ECU housing 20 described later is fixed to the ECU connection portion 101 by fitting.

[0033] It should be noted that the motor element not shown in the figure housed in the motor housing 10 is a well-known structure, so the specific illustration is omitted, but it has: a stator, which is composed of coils (three-phase windings of U phase, V phase, and W phase) wound on an iron core (teeth); a cylindrical rotor, which is rotatably housed on the inner circumference of the stator via a prescribed gap, and a plurality of permanent magnets are arranged on the outer circumference in a manner such that the magnetic poles alternate in the circumferential direction.

[0034] One axial end side (first end side Z1) of the motor rotating shaft 11 is connected to a steering shaft or rack shaft of the power steering device (not shown) via a reduction mechanism (such as a worm gear) (not shown). On the other hand, a well-known sensor magnet MG is installed at the end of the other end side (second end side Z2) of the motor rotating shaft 11, and the rotation position (rotation angle) of the motor rotating shaft 11 is detected via the sensor magnet MG.

[0035] The electronic control device E1 is formed into a substantially cylindrical shape having an outer diameter substantially the same as that of the motor M, and is connected to the second end side Z2 of the motor M. Specifically, the electronic control device E1 includes: an ECU case 20 as a frame body, which is mounted on the end of the second end side Z2 of the motor case 10; a circuit module 3, which is accommodated in a storage space S formed in the ECU case 20; and a connector module 4, which is connected to the circuit module 3 and supplies power to a power conversion circuit (not shown) described later.

[0036] It should be noted that in the present embodiment, an example is given of a scheme in which an unillustrated power conversion circuit and an unillustrated control circuit are arranged on a single circuit substrate 30 in a single circuit module 3, but the power conversion circuit can also be formed on an unillustrated power conversion circuit substrate that is arranged separately (independently) from a control substrate on which the unillustrated control circuit is formed.

[0037] The ECU case 20 includes a first case 21 as a mounting base fitted to and fixed to an end portion on the second end side Z2 of the motor case 10 , and a second case 22 as a cover fitted to and mounted on the second end side Z2 of the first case 21 .

[0038] The first housing 21 is formed of a metal material in a substantially disk shape, and functions as a mounting base for the circuit board 30, and functions as a heat sink for dissipating heat generated by electronic components mounted on the circuit board 30. It should be noted that a first annular sealing member S1 such as an O-ring is interposed between the first housing 21 and the second housing 22, and the outer peripheral surface of the first housing 21 and the inner peripheral surface of the second housing 22 are sealed liquid-tightly by the first sealing member S1.

[0039] The second shell 22 is made of a metal material or a synthetic resin material, and is formed into a bottomed cylindrical shape with one axial end side (the first end side Z1) open and the other end side (the second end side Z2) closed. Specifically, the second shell 22 has an opening portion 23 opened at the first end side Z1, a bottom wall 24 that closes the second end side Z2, and a cylindrical side wall 25 that rises approximately vertically from the outer periphery of the bottom wall 24 and extends toward the first end side Z1. In addition, the bottom wall 24 of the second shell 22 is provided with a connector insertion hole 26, and the connector insertion hole 26 allows the first connector port 421 and the second connector port 422 described later of the connector module 4 to pass through so that the first connector port 421 and the second connector port 422 face the outside.

[0040] It should be noted that an annular second sealing member S2 such as an O-ring is provided between the second housing 22 and the connector base 41 of the connector module 4, which will be described later, in the outer peripheral area of ​​the connector insertion hole 26. That is, the second sealing member S2 prevents foreign matter from entering the second housing 22 from the outside through the connector insertion hole 26.

[0041] The circuit module 3 is composed of a circuit substrate 30 which is a single multilayer printed circuit board in a substantially disk shape. On the first surface B1 of the circuit substrate 30 which is opposite to the connector module 4, for example, the power conversion circuit, for example, the inverter circuit, which is not shown in the figure, is configured. A plurality of switching elements 31 constituting the inverter circuit, a pre-driver 32 which is a driving circuit component for driving and controlling the switching elements 31, and other electronic components are mounted on each of the three-phase windings of the motor M as a driving system capable of driving the motor M. On the other hand, on the second surface B2 of the circuit substrate 30 which is opposite to the motor M, a microcomputer (hereinafter referred to as "microcomputer") 33 is provided, and a power supply relay 34 for supplying power, a signal relay 35 for inputting an external signal, a rotation angle sensor 36 for detecting the rotation angle of the motor rotating shaft 11, and the like are installed. The microcomputer 33, for example, constitutes the motor control circuit, which is not shown in the figure, and controls the driving control of the motor M. In addition, the unillustrated motor control circuit formed on the second surface B2 of the circuit substrate 30 is connected to the U-phase, V-phase, and W-phase connection terminals (winding terminals) connected to the motor M, namely, the U-phase connection terminal 12u, the V-phase connection terminal 12v, and the W-phase connection terminal 12w.

[0042] The connector module 4 includes: a substantially disk-shaped connector base 41, which is accommodated inside the second housing 22; and a first connector port 421 and a second connector port 422, which are a plurality of connector ports protruding from a first side surface 411 (end surface on the second end side Z2) of the connector base 41 that is opposite to the bottom wall 24 of the second housing 22. The connector base 41 is integrally formed with the first connector port 421 and the second connector port 422 by a synthetic resin material.

[0043] The connector base 41 buries a part of the power line 61, the CAN communication line 62, and the sensor signal line 63 which are exposed to the outside of the second housing 22 via the first connector port 421 and the second connector port 422, and introduces them into the storage space S in the ECU housing 20. It should be noted that the connector base 41 is fixed to the first housing 21 by fastening together with the circuit substrate 30 via a fastening member not shown, such as a screw. In addition, a plurality of switching elements 51, a plurality of noise filter coils 52, a plurality of noise filter capacitors 53, and a plurality of smoothing capacitors 54 are arranged on the second side surface 412 of the connector base 41 which is opposite to the circuit substrate 30. It should be noted that, although not shown in the figure, the smoothing capacitor 54 may also be configured to be held by a known capacitor holder.

[0044] The first connector port 421 and the second connector port 422 are exposed to the outside of the second housing 22 and are used to connect to a power source or various communication lines not shown. Specifically, the first connector port 421 is in the shape of a relatively large square tube, through which the flat power terminal 611 of the power line 61 connected to the circuit substrate 30 and the CAN communication terminal 621 of the CAN communication line 62 are inserted. On the other hand, the second connector port 422 is in the shape of a relatively small square tube, through which various sensor signal lines 63 such as a steering angle sensor or a torque sensor not shown are inserted.

[0045] Here, the power line 61 is composed of a pair of bus bars made of metal, and has a P-side bus bar 61p and an N-side bus bar 61n. The P-side bus bar 61p and the N-side bus bar 61n are respectively flat and have a wide P-side first plane portion 61p1 and an N-side first plane portion 61n1, and a narrow P-side second plane portion 61p2 and an N-side second plane portion 61n2, and are arranged parallel to each other. In addition, the P-side bus bar 61p and the N-side bus bar 61n are mainly composed of three parts by bending the middle part, and have a P-side connector connection terminal 611p and an N-side connector connection terminal 611n, a P-side buried portion 612p and an N-side buried portion 612n, and a P-side substrate connection portion 613p and an N-side substrate connection portion 613n.

[0046] The P-side connector connection terminal 611p and the N-side connector connection terminal 611n extend linearly from the first side surface 411 of the connector base 41 in a direction perpendicular to the connector base 41, and are exposed to the outside from the first connector port 421. The P-side embedded portion 612p and the N-side embedded portion 612n are bent at approximately right angles relative to the P-side connector connection terminal 611p and the N-side connector connection terminal 611n, extend linearly parallel to the connector base 41 inside the connector base 41, and are embedded inside the connector base 41. The P-side substrate connection portion 613p and the N-side substrate connection portion 613n are bent at approximately right angles relative to the P-side embedded portion 612p and the N-side embedded portion 612n, extend linearly from the second side surface 412 of the connector base 41 in a direction perpendicular to the connector base 41, and are connected to the circuit substrate 30.

[0047] Here, the P-side busbar 61p and the N-side busbar 61n are respectively configured such that the planar portions with a relatively wide width, that is, the P-side first planar portion 61p1 and the N-side first planar portion 61n1, are opposed to each other. On the other hand, the P-side embedded portion 612p and the N-side embedded portion 612n are configured such that the planar portions with relatively narrow widths, that is, the P-side second planar portion 61p2 and the N-side second planar portion 61n2, are opposed to each other. Furthermore, in the present embodiment, the first region Q1 where the P-side first planar portion 61p1 and the N-side first planar portion 61n1 of the P-side busbar 61p and the N-side busbar 61n are opposed is longer than the second region Q2 where the P-side second planar portion 61p2 and the N-side second planar portion 61n2 are opposed to each other.

[0048] Figure 2 Indicates that Figure 1 The vicinity of the P-side substrate connection portion 613p and the N-side substrate connection portion 613n is shown in an enlarged manner. Figure 1 The main part of the enlarged view. And, Figure 3 express Figure 2 shown Figure 1 Another example of an enlarged view of the main part.

[0049] like Figure 2As shown, in the electronic control device E1 of the present embodiment, the smoothing capacitor 54 arranged on the second side surface 412 of the connector base 41 and the switch element 31 arranged on the first surface B1 of the circuit substrate 30 are arranged opposite to each other in a manner close to each other. In addition, in the region close to the smoothing capacitor 54 and the switch element 31, the P-side substrate connection portion 613p and the N-side substrate connection portion 613n are arranged opposite to each other in a manner close to each other. In this way, in the present embodiment, the smoothing capacitor 54 arranged on the connector base 41 and the switch element 31 arranged on the circuit substrate 30 are arranged in a manner that the interval between them is as narrow as possible, and the P-side substrate connection portion 613p and the N-side substrate connection portion 613n are arranged in a position close to the smoothing capacitor 54 and the switch element 31 in a manner that the interval between them is as narrow as possible.

[0050] In other words, in this embodiment, the wiring length X of the P-side substrate connection portion 613p and the N-side substrate connection portion 613n is shortened as much as possible, thereby shortening the distance between the smoothing capacitor 54 and the switching element 31. As a result, the switching time of each switching element 31 can be shortened, and the heat generated by the switching of each switching element 31 can be reduced.

[0051] It should be noted that in this embodiment, considering the reduction of the mounting area of ​​the smoothing capacitor 54 at the connector base 41, Figure 2 As shown in the figure, the smoothing capacitor 54 is arranged longitudinally (the length direction is parallel to the rotation axis Z of the motor M, that is, orthogonal to the connector base 41), but it is not limited to this scheme. In other words, the smoothing capacitor 54 can also be arranged in a longitudinal direction, for example Figure 3 The lateral configuration shown (the length direction is orthogonal to the rotation axis Z of the motor M, that is, parallel to the connector base 41). In this case, depending on the relationship with other electronic components, the distance between the connector base 41 and the circuit substrate 30 can be further reduced, which has the advantage of further shortening the wiring length X of the P-side substrate connection portion 613p and the N-side substrate connection portion 613n.

[0052] Figure 4 It is along Figure 1 The cross-sectional view taken along the line AA of FIG. 1 is a cross-sectional view of the electronic control device E1 viewed from the second side surface 412 of the connector base 41 .

[0053] like Figure 4 As shown, the connector module 4 is disposed on the second side surface 412 of the connector base 41, closer to the rotation axis Z of the motor M (motor rotating shaft 11). Figure 4The left side region is provided with a plurality of (a pair of) noise filter coils 52m, 52s and a plurality of (a pair of) noise filter capacitors 53m, 53s. Furthermore, at a position outside the pair of noise filter coils 52m, 52s, a plurality of CAN communication line insertion holes 43 for inserting a plurality of CAN communication lines 62 and a plurality of sensor signal line insertion holes 44 for inserting a plurality of sensor signal lines 63 are axially penetrated.

[0054] Furthermore, on the second side surface 412 of the connector base 41, at a position closer to the rotation axis Z of the motor M (motor rotating shaft 11), Figure 4 The right side region is provided with a plurality of (four in this embodiment) switching elements 51m and 51s. In addition, on the second side surface 412 of the connector base 41, a plurality of (four in this embodiment) smoothing capacitors 54m and 54s are provided at positions outside the switching element 51, and a plurality of P-side busbar insertion holes 45p for the P-side substrate connection portion 613p to be inserted through, and a pair of N-side busbar insertion holes 45n for the N-side substrate connection portion 613n to be inserted through are provided at positions outside the smoothing capacitors 54m and 54s.

[0055] Here, the P-side busbar insertion hole 45p and the N-side busbar insertion hole 45n are arranged to face each other along the radial direction of the second side surface 412 of the connector base 41, and are arranged close to the smoothing capacitor 54. At this time, the P-side busbar insertion hole 45p and the N-side busbar insertion hole 45n are arranged so that the P-side first plane portion 61p1 with a wide width of the P-side substrate connection portion 613p and the N-side first plane portion 61n1 with a wide width of the N-side substrate connection portion 613n face each other, and the P-side first plane portion 61p1 and the N-side first plane portion 61n1 are close to each other.

[0056] More specifically, the P-side busbar insertion hole 45p and the N-side busbar insertion hole 45n are closely arranged at a spacing smaller than the width W1 of the wider P-side first plane portion 61p1 and the N-side first plane portion 61n1 in the P-side substrate connection portion 613p and the N-side substrate connection portion 613n, or the width W2 of the narrower P-side second plane portion 61p2 and the N-side second plane portion 61n2 in the P-side substrate connection portion 613p and the N-side substrate connection portion 613n.

[0057] Figure 5 It is along Figure 1 The cross-sectional view taken along the line BB of is a transverse cross-sectional view of the electronic control device E1 viewed from the first surface B1 side of the circuit board 30 .

[0058] like Figure 5 As shown, on the first surface B1 of the circuit substrate 30, closer to the rotation axis Z of the motor M (motor rotating shaft 11), Figure 5In the left region, a plurality of (a pair of) pre-drivers 32m and 32s are arranged radially. In addition, at a position on the circuit substrate 30 that is outside the pair of pre-drivers 52m and 52s, a plurality of CAN communication line insertion holes 391 for inserting a plurality of CAN communication lines 62 and a plurality of sensor signal line insertion holes 392 for inserting a plurality of sensor signal lines 63 are axially penetrated.

[0059] On the other hand, on the first surface B1 of the circuit board 30, at a position closer to the rotation axis Z of the motor M (motor rotating shaft 11), Figure 5 In the right region, the first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2 constituting the inverter circuit for driving control of the three-phase motor M are arranged in pairs so as to be opposed to the smoothing capacitor 54 arranged on the connector base 41 above and below the rotation axis Z of the motor M (motor rotating shaft 11). Specifically, the paired first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2 are arranged so as to be opposed to each other, with the first switching elements 31u1, 31v1, 31w1 being on the inner side and the second switching elements 31u2, 31v2, 31w2 being on the outer side.

[0060] Furthermore, on the circuit substrate 30, in the arrangement direction of the first switching elements 31u1, 31v1, and 31w1, on the outer sides of each of the first switching elements 31u1, 31v1, and 31w1, there are respectively formed in a through state a U-phase terminal insertion hole 37u, a V-phase terminal insertion hole 37v, and a W-phase terminal insertion hole 37w for inserting connection terminals (winding terminals) of three phases (U-phase, V-phase, and W-phase) extending from the motor M side, namely, a U-phase connection terminal 12u, a V-phase connection terminal 12v, and a W-phase connection terminal 12w.

[0061] Furthermore, on the first surface B1 of the circuit substrate 30, in an area which is closer to the outer periphery than the second switching elements 31u2, 31v2, and 31w2 with respect to the rotation axis Z of the motor M (motor rotating shaft 11) and at a position corresponding to the P-side busbar insertion hole 45p and the N-side busbar insertion hole 45n in the connector base 41, a pair of P-side busbar insertion holes 38p and N-side busbar insertion holes 38n for inserting the P-side substrate connecting portion 613p and the N-side substrate connecting portion 613n are formed in a manner that is close to and opposite to each other like the P-side busbar insertion holes 45p and the N-side busbar insertion holes 45n of the connector base 41.

[0062] Figure 6 It is along Figure 1 The cross-sectional view taken along the line CC of is a transverse cross-sectional view of the electronic control device E1 viewed from the second surface B2 side of the circuit board 30 .

[0063] like Figure 6 As shown, on the second surface B2 of the circuit substrate 30, closer to the rotation axis Z of the motor M (motor rotating shaft 11), Figure 6 In the left area, a plurality of (a pair of) microcomputers 33m and 33s are arranged symmetrically up and down with the rotation axis Z of the motor M (motor rotating shaft 11) interposed therebetween. In addition, a rotation angle sensor RE is arranged in the center of the second surface B2 of the circuit substrate 30. The rotation angle sensor RE cooperates with the sensor magnet MG provided on the motor rotating shaft 11 to detect the rotation phase and rotation speed of the motor rotating shaft 11. In addition, a rotation angle sensor RE is arranged in the center of the second surface B2 of the circuit substrate 30. The rotation angle sensor RE is arranged closer to the rotation axis Z of the motor M (motor rotating shaft 11) than the rotation axis Z of the motor M (motor rotating shaft 11). Figure 6 In the right region, a power supply relay 34 and a signal relay 35 are arranged adjacent to each other in the radial direction.

[0064] It should be noted that, on the second surface B2 of the circuit substrate 30, closer to the rotation axis Z of the motor M (motor rotating shaft 11), Figure 6 The left side region has an empty space BS on both sides of the power relay 34 and the signal relay 35. The empty space BS can be used to cool the inverter circuit (not shown) formed on the second surface B2 of the circuit substrate 30 by bringing the inverter circuit (not shown) into contact with the first housing 21 functioning as a heat sink, and can also be used as a mounting space for other electronic components (not shown).

[0065] (Effects of this embodiment)

[0066] The aforementioned conventional electronic control device has an increased number of connector ports due to the redundant system structure. On the other hand, the smoothing capacitor and other so-called filter components are mounted on the circuit substrate, so the area where the connector ports can be arranged is reduced. In particular, when configuring a redundant system, electronic components are mounted in multiples of the number of systems, so a larger mounting area needs to be ensured. Therefore, as in the aforementioned conventional electronic control device, smoothing capacitors and other filter components that occupy a large area are mounted on the circuit substrate, which becomes a disadvantageous factor in miniaturization of the electronic control device, and there is room for improvement in this regard.

[0067] On the other hand, according to the electronic control device E1 of the present embodiment, the following effects are achieved, thereby being able to solve the technical problems of the above-mentioned conventional electronic control devices.

[0068] The electronic control device E1 has a power conversion system that converts power from a power supply into driving power for driving a rotating motor (the motor M in this embodiment), and the electronic control device E1 includes: a power conversion circuit module or a power conversion circuit substrate (the circuit substrate 30 in this embodiment), which forms a power conversion circuit constituting the power conversion system; a frame (the ECU housing 20 in this embodiment), which has a storage space S inside to store the circuit substrate 30; a connector module 4, which has a connector base 41 and a connector port (in this embodiment, equivalent to the first connector port 421 and the second connector port 42 2), the connector base 41 is housed together with the circuit substrate 30 in the housing space S, and the connector port is protrudingly formed on the first side surface 411 of the connector base 41, facing the outside of the ECU housing 20; capacitors (in this embodiment, equivalent to noise filter capacitors 53m, 53s and smoothing capacitors 54m, 54s), which are installed on the second side surface 412 of the connector base 41 opposite to the circuit substrate 30 and on the opposite side of the first side surface 411, and are used for smoothing power or removing noise from the power line 61 connected to the power conversion circuit from the connector port (in this embodiment, equivalent to the first connector port 421) .

[0069] Thus, in the present embodiment, the noise filter capacitors 53m, 53s and the smoothing capacitors 54m, 54s, which occupy a large mounting area, are arranged on the second side surface 412 of the connector base 41 instead of being arranged on the circuit board 30. Thus, the mounting area of ​​the circuit board 30 can be reduced by an amount corresponding to the noise filter capacitors 53m, 53s and the smoothing capacitors 54m, 54s arranged on the connector base 41, and the electronic control device E1 can be miniaturized.

[0070] Furthermore, in the present embodiment, the power line 61 is composed of a bus bar that can be conducted (in the present embodiment, it corresponds to the P-side bus bar 61p and the N-side bus bar 61n), and the P-side bus bar 61p and the N-side bus bar 61n are provided in a manner that passes through the interior of the connector module 4 from the connector port (in the present embodiment, it corresponds to the first connector port 421) and faces the storage space S of the ECU case 20 from the second side surface 412 of the connector base 41, and are connected to the circuit substrate 30. In addition to the capacitor (in the present embodiment, it corresponds to the noise filter capacitor 53m, 53s and the smoothing capacitor 54m, 54s), other electronic components (in the present embodiment, it corresponds to the switching element 51m, 51s and the noise filter coil 52m, 52s) are mounted on the second side surface 412 of the connector module 4. On the second side surface 412 of the connector module 4, the capacitor (in the present embodiment, it corresponds to the smoothing capacitor 54m, 54s) is arranged closer to the P-side bus bar 61p and the N-side bus bar 61n facing the storage space S than the other electronic components.

[0071] Here, the inductance L between the parallel flat conductors is calculated based on the calculation formula "L (inductance) = μ (magnetic permeability) × d (opposing distance of flat plates) / W (width of opposing flat plates)". That is, according to this calculation formula, the smaller the opposing distance d between the flat conductors, the smaller the inductance L, and the larger the width W of the opposing flat conductors, the smaller the inductance L. In addition, the smaller the wiring length of the flat conductor, that is, the distance between the switch element and the filter component (capacitor) connected by the flat conductor, the smaller the inductance L.

[0072] Therefore, in the present embodiment, the smoothing capacitors 54m and 54s are arranged closer to the P-side bus bar 61p and the N-side bus bar 61n than the other electronic components, namely the switching elements 51m and 51s and the noise filter coils 52m and 52s. As a result, the inductance L between the P-side bus bar 61p and the N-side bus bar 61n is reduced, and the mounting area of ​​the smoothing capacitors 54m and 54s can be reduced on the second side surface 412 of the connector base 41, which contributes to further miniaturization of the electronic control device E1.

[0073] Furthermore, in the present embodiment, the power line 61 is composed of a bus bar that can be conducted (in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n), and the P-side bus bar 61p and the N-side bus bar 61n are arranged in a manner that passes through the interior of the connector module 4 from the connector port (in the present embodiment, the first connector port 421) and faces the storage space S of the ECU housing 20 from the second side surface 412 of the connector base 41, and are connected to the circuit substrate 30. The power conversion circuit has a plurality of switching elements, and the circuit substrate 30 and the plurality of switching elements (in the present embodiment, equivalent to the first switching elements 31u1, 31v1, Other electronic components (equivalent to multiple pre-drivers 32m, 32s in the present embodiment) are installed together with the first switch elements 31u1, 31v1, 31w1 and the second switch elements 31u2, 31v2, 31w2), and in the second side 412 of the connector module 4, at least one of the first switch elements 31u1, 31v1, 31w1 and the second switch elements 31u2, 31v2, 31w2 is arranged closer to the exposed wiring portions of the P-side bus bar 61p and the N-side bus bar 61n (equivalent to the P-side substrate connection portion 613p and the N-side substrate connection portion 613n in the present embodiment) facing the storage space S than the other electronic components.

[0074] Thus, in the present embodiment, at least one of the first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2 is arranged closer to the P-side bus bar 61p and the N-side bus bar 61n than the other electronic components, namely the pre-drivers 32m, 32s. Thus, the wiring length X between the first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2 and the smoothing capacitors 54m, 54s can be shortened, and the inductance L between the P-side bus bar 61p and the N-side bus bar 61n can be reduced.

[0075] Furthermore, with the reduction of the inductance L of the P-side bus bar 61p and the N-side bus bar 61n, the switching time of the first switching element 31u1, 31v1, 31w1 and the second switching element 31u2, 31v2, 31w2 can be shortened. As a result, the heat generation in the first switching element 31u1, 31v1, 31w1 and the second switching element 31u2, 31v2, 31w2 is reduced, and the cooling structure for cooling the first switching element 31u1, 31v1, 31w1 and the second switching element 31u2, 31v2, 31w2 can be simplified. In this way, the reduction of the inductance L of the P-side bus bar 61p and the N-side bus bar 61n and the shortening of the switching time contribute to further miniaturization of the electronic control device E1.

[0076] Furthermore, in the present embodiment, the power line 61 has a P-side bus bar 61p and an N-side bus bar 61n, and the exposed wiring portions of the P-side bus bar 61p and the N-side bus bar 61n facing the storage space S (in the present embodiment, equivalent to the P-side substrate connection portion 613p and the N-side substrate connection portion 613n) are arranged opposite to each other.

[0077] Thus, in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n are arranged to face each other. Thus, the distance d between the P-side bus bar 61p and the N-side bus bar 61n can be shortened, and the inductance L between the P-side bus bar 61p and the N-side bus bar 61n can be reduced. As a result, the smoothing capacitors 54m and 54s can be miniaturized, and the electronic control device E1 can be miniaturized more effectively.

[0078] Furthermore, in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n are wirings formed as wide flat plates, and are arranged so that the wide side surfaces (in the present embodiment, corresponding to the P-side first planar portion 61p1 and the N-side first planar portion 61n1) are opposed to each other.

[0079] Thus, in this embodiment, the P-side bus bar 61p and the N-side bus bar 61n are formed of wirings formed in a wide flat plate shape, and the wide side surfaces, namely, the P-side first flat surface portion 61p1 and the N-side first flat surface portion 61n1, are arranged to face each other. As a result, the inductance L between the P-side bus bar 61p and the N-side bus bar 61n is reduced, which contributes to the miniaturization of the smoothing capacitors 54m and 54s. As a result, the electronic control device E1 can be miniaturized more effectively.

[0080] Furthermore, in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n are opposed to each other at a distance closer than the width dimension (in the present embodiment, equivalent to the width W1 of the P-side first plane portion 61p1 and the N-side first plane portion 61n1) or the thickness dimension (in the present embodiment, equivalent to the width W2 of the P-side second plane portion 61p2 and the N-side second plane portion 61n2) of the P-side bus bar 61p and the N-side bus bar 61n.

[0081] Thus, in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n are opposed to each other at a distance closer than the width W1 of the P-side first plane portion 61p1 and the N-side first plane portion 61n1 or the width W2 of the P-side second plane portion 61p2 and the N-side second plane portion 61n2. Thus, the inductance L between the P-side bus bar 61p and the N-side bus bar 61n can be effectively reduced, which contributes to further miniaturization of the smoothing capacitors 54m and 54s. As a result, the electronic control device E1 can be miniaturized more effectively.

[0082] Furthermore, in the present embodiment, the distance X1 of the interval where the wide sides of the P-side bus bar 61p and the N-side bus bar 61n are opposite to each other (in the present embodiment, it is equivalent to the first area Q1 where the P-side first plane portion 61p1 and the N-side first plane portion 61n1 are opposite to each other) is longer than the distance X2 of the interval where the wide sides are not opposite to each other (the second area Q2 where the P-side second plane portion 61p2 and the N-side second plane portion 61n2 are opposite to each other).

[0083] Thus, in the present embodiment, the distance X1 of the first region Q1 where the P-side first plane portion 61p1 and the N-side first plane portion 61n1 face each other is configured to be longer than the distance X2 of the second region Q2 where the P-side second plane portion 61p2 and the N-side second plane portion 61n2 face each other. Thus, by setting the distance X1 of the first region Q1 where the P-side first plane portion 61p1 and the N-side first plane portion 61n1 face each other to be relatively long, the inductance L between the P-side bus bar 61p and the N-side bus bar 61n can be reduced compared to the case where the distance X2 of the second region Q2 where the P-side second plane portion 61p2 and the N-side second plane portion 61n2 face each other is set to be relatively long.

[0084] [Second embodiment]

[0085] Figures 7 to 10 The second embodiment of the electronic control device of the present invention is shown, and the structure of the power line 61, that is, the P-side bus bar 61p and the N-side bus bar 61n of the electronic control device E1 of the first embodiment is changed. It should be noted that the basic structure other than the change is the same as that of the first embodiment, so the same reference numerals are attached to the same structure as the first embodiment, and the description thereof is omitted.

[0086] Figure 7 FIG. 1 shows an electronic control device E2 according to a second embodiment of the present invention, and is a longitudinal sectional view of a motor unit MU in which the electronic control device E2 and a motor M are integrally configured, taken along the rotation axis Z direction of the motor M. FIG. Figure 8 It is along Figure 7 The cross-sectional view taken along the line DD of FIG. 1 is a transverse cross-sectional view of the electronic control device E2 viewed from the second side surface 412 of the connector base 41 . Fig. 9 It is along Figure 7 The cross-sectional view taken along line EE of is a transverse cross-sectional view of the electronic control device E2 viewed from the first surface B1 side of the circuit board 30 . Fig.10 It is along Figure 7 The cross-sectional view taken along the line FF of FIG. 1 is a transverse cross-sectional view of the electronic control device E2 viewed from the second surface B2 side of the circuit board 30 .

[0087] like Figures 7 to 10 As shown, in the electronic control device E2 of this embodiment, the P-side bus bar 61p has a plurality of P-side branching portions 613px branched at the P-side substrate connection portion 613p, and the N-side bus bar 61n has a plurality of N-side branching portions 613nx branched at the N-side substrate connection portion 613n. Moreover, the P-side branching portion 613px and the N-side branching portion 613nx are similar to the first embodiment described above, and are respectively formed in a structure where the planar portions with relatively wide widths, namely, the P-side first planar portion 61p1 and the N-side first planar portion 61n1, are opposed to each other.

[0088] Furthermore, a plurality of P-side busbar insertion holes 45p through which the P-side branch portions 613px of the P-side substrate connection portion 613p are inserted and a plurality of N-side busbar insertion holes 45n through which the N-side branch portions 613nx of the N-side substrate connection portion 613n are inserted are arranged on the second side surface 412 of the connector base 41 at a position outside the smoothing capacitors 54m and 54s. Here, the P-side busbar insertion holes 45p and the N-side busbar insertion holes 45n are arranged in pairs so as to be staggered with each other along the outer periphery of the circuit substrate 30.

[0089] In other words, in this embodiment, the P-side branch portions 613px and the N-side branch portions 613nx that are branched into multiple portions are respectively formed as a group of P-side branch portions 613px and a group of N-side branch portions 613nx, and are not respectively concentrated in each P-side branch portion 613px and each N-side branch portion 613nx, but are staggered with each other in such a manner that pairs of P-side branch portions 613px and N-side branch portions 613nx are adjacent to each other.

[0090] In addition, the P-side busbar insertion hole 38p and the N-side busbar insertion hole 38n are similar to the first embodiment, and the P-side substrate connection portion 613p (P-side branch portion 613px) and the N-side substrate connection portion 613n (N-side branch portion 613nx) are arranged in a manner close to each other with a spacing smaller than the width W1 of the wider P-side first plane portion 61p1 and the N-side first plane portion 61n1 in the P-side substrate connection portion 613p (P-side branch portion 613px) and the N-side substrate connection portion 613n (N-side branch portion 613nx), or the width W2 of the narrower P-side second plane portion 61p2 and the N-side second plane portion 61n2 in the P-side substrate connection portion 613p (P-side branch portion 613px) and the N-side substrate connection portion 613n (N-side branch portion 613nx).

[0091] Furthermore, the first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2 are arranged in a so-called staggered manner on the first surface B1 of the circuit substrate 30, with the first switching elements 31u1, 31v1, 31w1 being located on the inner side and the second switching elements 31u2, 31v2, 31w2 being located on the outer side. In addition, on the outer side of each second switching element 31u2, 31v2, 31w2, a U-phase terminal insertion hole 37u, a V-phase terminal insertion hole 37v, and a W-phase terminal insertion hole 37w are formed in a through state for inserting the U-phase, V-phase, and W-phase connection terminals (winding terminals) connected to the motor M, namely, the U-phase connection terminal 12u, the V-phase connection terminal 12v, and the W-phase connection terminal 12w.

[0092] Furthermore, on the first surface B1 of the circuit substrate 30, relative to the rotation axis Z of the motor M (motor rotating shaft 11), in an area closer to the outer periphery than the first switching elements 31u1, 31v1, 31w1 and the second switching elements 31u2, 31v2, 31w2, at positions in the connector base 41 corresponding to the P-side busbar insertion holes 45p and the N-side busbar insertion holes 45n, a plurality of P-side busbar insertion holes 38p and N-side busbar insertion holes 38n for inserting the P-side branch portions 613px and the N-side branch portions 613nx are formed in pairs along the outer periphery of the circuit substrate 30 to be in a through state.

[0093] In other words, in this embodiment, the P-side branch portions 613px and the N-side branch portions 613nx that are branched into multiple portions are respectively formed as a group of P-side branch portions 613px and a group of N-side branch portions 613nx, and are not respectively concentrated in each P-side branch portion 613px and each N-side branch portion 613nx, but are staggered with each other in such a manner that pairs of P-side branch portions 613px and N-side branch portions 613nx are adjacent to each other.

[0094] As described above, in the present embodiment, the power line 61 has a P-side bus bar 61p and an N-side bus bar 61n. The P-side bus bar 61p has a P-side branch portion 613px branched into a plurality of portions at an exposed wiring portion facing the storage space S (in the present embodiment, equivalent to the P-side substrate connection portion 613p). The N-side bus bar 61n has a N-side branch portion 613nx branched into a plurality of portions at an exposed wiring portion facing the storage space S (in the present embodiment, equivalent to the N-side substrate connection portion 613n). The P-side branch portion 613px and the N-side branch portion 613nx are staggered with each other.

[0095] Thus, in the present embodiment, the P-side bus bar 61p and the N-side bus bar 61n are respectively provided with a plurality of P-side branch portions 613px and N-side branch portions 613nx, and the P-side branch portions 613px and the N-side branch portions 613nx are arranged to be staggered with each other. Thus, the facing area of ​​the P-side bus bar 61p and the N-side bus bar 61n is increased, and the inductance L between the P-side bus bar 61p and the N-side bus bar 61n can be reduced. As a result, the smoothing capacitors 54m and 54s can be miniaturized, and the electronic control device E1 can be miniaturized more effectively.

[0096] It should be noted that in the present embodiment, the P-side substrate connection portion 613p and the N-side substrate connection portion 613n are exemplified as being branched into eight P-side branch portions 613px and eight N-side branch portions 613nx, respectively, and the eight P-side branch portions 613px and eight N-side branch portions 613nx are respectively arranged in an arc shape along the outer periphery of the connector base 41 and the circuit substrate 30. However, the form of the P-side branch portion 613px and the N-side branch portion 613nx is not limited to the eight branch forms and the arc shape along the outer periphery, and as shown in the following modified examples, any number of branches or any arrangement form can be adopted according to the specifications of the electronic control device E2, etc.

[0097] (First Modification)

[0098] Fig.11 It shows a first variation of the second embodiment of the present invention, which is equivalent to Figure 7 A cross-sectional view of the electronic control device E21 taken along line EE.

[0099] like Fig.11 As shown, the P-side branch portion 613px and the N-side branch portion 613nx may be arranged linearly in the radial direction at the center of the circuit substrate 30 .

[0100] (Second Modification)

[0101] Fig.12 It shows the second modification of the second embodiment of the present invention, which is equivalent to Figure 7 A cross-sectional view of the electronic control device E22 taken along line EE.

[0102] like Fig.12As shown, the P-side substrate connection portion 613p and the N-side substrate connection portion 613n may be branched into two P-side branch portions 613px and N-side branch portions 613nx, which are less than the eight branch forms of the second embodiment. In this case, the P-side branch portions 613px and the N-side branch portions 613nx may be arranged in pairs in an opposing manner, and the P-side branch portions 613px and the N-side branch portions 613nx may be arranged in a so-called figure eight shape along the outer periphery of the circuit substrate 30.

[0103] The present invention is not limited to the configurations or forms illustrated in the above-mentioned embodiments, and can be freely changed according to the specifications, costs, etc. of the electronic control device to which the present invention is applied, as long as the above-mentioned effects of the present invention can be achieved.

[0104] In particular, the present invention only needs to arrange the capacitors that require a larger mounting area than other electronic components on the connector module side, and other electronic components can be arbitrarily arranged on the connector module or the circuit substrate. Moreover, the shapes of the P-side bus bar 61p and the N-side bus bar 61n constituting the power line 61 can obviously also be arbitrarily changed according to the power conversion circuit constituting the circuit substrate.

[0105] Furthermore, in the embodiment, the inverter circuit as the power conversion circuit is exemplified as being formed on a power conversion circuit substrate (circuit substrate 30), but the inverter circuit may also be formed as a so-called power conversion circuit module that is packaged and includes power conversion functional elements and other functional elements.

[0106] (Other technical ideas)

[0107] The technical ideas other than the invention described in the claims are described below.

[0108] (a) The electronic control device according to claim 1, characterized in that:

[0109] The power line is composed of a bus bar that can conduct electricity.

[0110] The bus bar is arranged in a manner of passing through the interior of the connector module from the connector port and facing the storage space of the frame body from the second side surface of the connector base, and is connected to the power conversion circuit module.

[0111] The power conversion circuit module is a packaged electronic component that includes power conversion functional elements and other functional elements.

[0112] On the second side surface of the connector module, the power conversion functional element in the package is arranged closer to the exposed wiring portion of the bus bar facing the housing space than the other functional elements.

[0113] (b) The electronic control device according to claim 1, characterized in that:

[0114] The power conversion system is a power conversion system having the power conversion circuit module.

[0115] The power conversion system includes a control substrate on which a microcomputer for controlling the power conversion circuit module or a drive circuit component for outputting a drive signal to the power conversion circuit module is mounted.

[0116] The power line is composed of a bus bar that can conduct electricity.

[0117] The bus bar is arranged in a manner of passing through the interior of the connector module from the connector port and facing the storage space of the frame body from the second side surface of the connector base, and is connected to the power conversion circuit module and the control substrate.

[0118] The power conversion circuit module is arranged on the second side surface of the connector module closer to the exposed wiring portion of the bus bar facing the housing space than the electronic components mounted on the control board.

[0119] (c) The electronic control device according to claim 1, characterized in that:

[0120] A capacitor related to the power smoothing is mounted on the second side surface of the connector module, and a capacitor and a coil component related to the noise removal are mounted to form a noise filter circuit.

[0121] (d) The electronic control device according to claim 1, characterized in that:

[0122] The rotating electrical machine has at least a plurality of windings, and the power conversion system is a power conversion system for supplying driving power to each of the windings.

[0123] The connector port, the capacitor, and the power conversion circuit constitute a power supply system for each of the windings.

[0124] The rotating electric machine can be driven by supplying electricity to the corresponding windings through at least one power supply system.

[0125] (e) The electronic control device according to claim 1, characterized in that:

[0126] The power line is composed of an aluminum busbar that can conduct electricity.

[0127] The first end of the busbar is located inside the connector port.

[0128] The middle portion of the busbar passes through the interior of the connector module.

[0129] The second end of the bus bar faces the receiving space of the frame from the second side surface of the connector base and is located in the receiving space.

[0130] (f) The electronic control device according to claim 1, characterized in that:

[0131] The rotating electrical machine has at least a plurality of windings,

[0132] The power conversion circuit system is a power conversion system that supplies driving power to each of the windings.

[0133] The connector port, the capacitor, and the power conversion circuit constitute a power supply system for each of the windings.

[0134] The power conversion circuit is formed on the power conversion circuit substrate.

[0135] The power conversion circuit substrate is a substrate on which a control circuit component including a microcomputer and a drive circuit component are mounted. The drive circuit component outputs a drive support signal based on a calculation result of the microcomputer to the power conversion circuit.

[0136] The power conversion circuit component, the control circuit component, and the drive circuit component of the power conversion circuit are provided for each of the windings as a drive system capable of driving the rotating electrical machine for each of the windings on the substrate.

[0137] At least the power conversion component, the microcomputer, and a part of the drive circuit components are arranged symmetrically on the substrate between the drive systems with respect to a surface of a geometric structure.

[0138] (g) The electronic control device according to (f) above, characterized in that:

[0139] The substrate is a single multi-layer printed substrate.

[0140] (h) The electronic control device according to claim 1, characterized in that:

[0141] A capacitor holder for holding the capacitor is provided at a mounting position of the capacitor related to the power smoothing on the second side surface.

[0142] (i) The electronic control device according to (h) above, characterized in that:

[0143] The capacitor is held by the capacitor holder such that a longitudinal direction of the capacitor is in a direction of a rotation axis of the rotating electrical machine.

Claims

1. An electronic control device having a power conversion system for converting power from a power supply into driving power for driving a rotating electric machine, characterized in that: have: a power conversion circuit module or a power conversion circuit substrate formed with a power conversion circuit constituting the power conversion system; A frame having a storage space therein for storing the power conversion circuit module or the power conversion circuit substrate; A connector module having a connector base and a connector port, wherein the connector base is stored in the storage space together with the power conversion circuit module or the power conversion circuit substrate, and the connector port is formed to protrude from a first side surface of the connector base and faces the outside of the frame; A capacitor is mounted on a second side surface of the connector base that is located on the opposite side of the first side surface, and is used to smooth power or remove noise from a power line connected to the power conversion circuit from the connector port.

2. The electronic control device according to claim 1, characterized in that: The power line is composed of a bus bar that can conduct electricity. The bus bar is arranged in a manner of passing through the interior of the connector module from the connector port and facing the storage space from the second side surface of the connector base, and is connected to the power conversion circuit module or the power conversion circuit substrate. On the second side surface of the connector module, other electronic components are mounted in addition to the capacitor. The capacitor is arranged on the second side surface of the connector module closer to the bus bar facing the storage space than the other electronic components.

3. The electronic control device according to claim 1, characterized in that: The power line is composed of a bus bar that can conduct electricity. The bus bar is arranged in a manner of passing through the interior of the connector module from the connector port and facing the storage space from the second side surface of the connector base, and is connected to the power conversion circuit substrate. The power conversion circuit has a plurality of switching elements. The power conversion circuit substrate is mounted with other electronic components together with the plurality of switching elements. At least one of the plurality of switching elements is arranged on the second side surface of the connector module closer to an exposed wiring portion of the bus bar facing the storage space than the other electronic components.

4. The electronic control device according to claim 1, characterized in that: The power line has a P-side bus bar and an N-side bus bar, The exposed wiring portions of the P-side bus bar and the N-side bus bar facing the housing space are arranged to face each other.

5. The electronic control device according to claim 4, characterized in that: The P-side bus bar and the N-side bus bar are wirings formed in a wide flat plate shape, and are arranged so that the wide side surfaces face each other.

6. The electronic control device according to claim 5, characterized in that: The P-side bus bar and the N-side bus bar are opposed to each other at a distance that is closer than a width dimension or a thickness dimension of each of the bus bars.

7. The electronic control device according to claim 6, characterized in that: A distance between sections where the wide side surfaces of the P-side bus bar and the N-side bus bar face each other is longer than a distance between sections where the wide side surfaces do not face each other.

8. The electronic control device according to claim 1, characterized in that: The power line has a P-side bus bar and an N-side bus bar, The P-side busbar row has a plurality of P-side branch portions branched into a plurality of P-side branch portions at the exposed wiring portion facing the storage space. The N-side busbar row has a plurality of N-side branch portions branched into a plurality of N-side branch portions at the exposed wiring portion facing the storage space. The P-side branch portion and the N-side branch portion are arranged to be staggered with each other.

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