Power control device and power unit

Abstract

To provide a power control device and power unit that can provide noise suppression effects at both direct current and alternating current ends.SOLUTION: A power unit 2 includes a housing 6 that houses a circuit element 20 as a power control device. The housing 6 houses a core 51 that provides a noise filter and a core 52. The housing 6 includes a wall member 60 that includes an electromagnetic shielding member 62. The wall member 60 is disposed between the core 51 and the core 52. The wall member 60 suppresses electromagnetic effects from the core 51 to the core 52 and / or electromagnetic effects from the core 52 to the core 51. The wall member 60 is arranged to shield the arrival of a virtual straight line from the core 51 to the core 52 and / or to shield the arrival of a virtual straight line from the core 52 to the core 51.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The disclosure herein relates to power control devices and power units. [Background technology]

[0002] Patent Document 1 discloses a power conversion device equipped with a ferrite core as a noise filter. Patent Document 1 discloses a power transmission mechanism that transmits the power of a motor to an axle. The power conversion device is provided in a housing of the power transmission mechanism. The contents of the prior art documents are incorporated by reference as explanations of the technical elements in this specification. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-107381 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, a ferrite core is provided on a current-carrying member (bus bar) between a battery and a power control device. A power control device including a converter circuit and / or an inverter circuit may require noise countermeasures on both the input side and the output side. In the above-mentioned respects and other respects not mentioned, further improvements are required for power control devices.

[0005] One disclosed object is to provide a power control device and power unit that can provide noise suppression effects at both the DC end and the AC end.

[0006] Another disclosed object is to provide a power control device and power unit that reduces interactions between multiple cores providing a noise filter. [Means for solving the problem]

[0007] The power control device disclosed herein comprises a first conductive member (22) for passing a current, a second conductive member (23) for passing a current different from that through the first conductive member, a first core (51) provided on the first conductive member as a noise filter, a second core (52) provided on the second conductive member as a noise filter, and a wall member (60) including a shielding member arranged to at least partially shield between the first core and the second core, and suppressing electromagnetic action from the first core to the second core and / or electromagnetic action from the second core to the first core.

[0008] According to the disclosed power control device, the noise suppression effect of the noise filter is obtained in both the first conductive member and the second conductive member through which different currents flow depending on the first core and the second core. A wall member is disposed between the first core and the second core. The wall member is disposed so as to at least partially shield the space between the first core and the second core. Moreover, the wall member suppresses electromagnetic action from the first core to the second core and / or electromagnetic action from the second core to the first core. As a result, a decrease in the noise suppression effect of the first core and / or a decrease in the noise suppression effect of the second core is suppressed.

[0009] The power unit disclosed herein comprises the above-mentioned power control device, a rotating electric machine (30) whose input and output power is controlled by the power control device, a power transmission element (40) that operatively connects the rotating electric machine and an output shaft (4), and a housing (6) that connects the power control device, the rotating electric machine, and the power transmission element together.

[0010] According to the disclosed power unit, in a power unit integrally provided with a power control device, a decrease in the noise suppression effect of the first core and / or a decrease in the noise suppression effect of the second core is suppressed.

[0011] The various embodiments disclosed in this specification employ different technical means to achieve their respective objectives. The claims and the parenthetical symbols described in this section are merely illustrative of the corresponding relationship with the embodiments described below, and are not intended to limit the technical scope. The objectives, features, and effects disclosed in this specification will become more apparent by referring to the following detailed description and the accompanying drawings. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram showing a power system according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing multiple cores in a power control device. [Diagram 3] FIG. 2 is a plan view showing multiple cores in a power control device. [Figure 4] FIG. 11 is a plan view showing multiple cores according to the second embodiment. [Diagram 5] FIG. 11 is a plan view showing multiple cores according to a third embodiment. [Figure 6] FIG. 11 is a perspective view showing a plurality of cores according to a fourth embodiment. [Figure 7] FIG. 13 is a plan view showing multiple cores according to a fifth embodiment. [Figure 8] FIG. 13 is a plan view showing multiple cores according to the sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A number of embodiments will be described with reference to the drawings. In a number of embodiments, functionally and / or structurally corresponding and / or associated parts may be given the same reference numerals or reference numerals with different digits of 100 or more. For corresponding and / or associated parts, reference may be made to the description of other embodiments.

[0014] First embodiment FIG. 1 is a block diagram showing a vehicle power system 1. In this embodiment, the vehicle is a vehicle that travels on the ground. The vehicle is an electric vehicle powered by a rotating electric machine that provides running power by electricity. The vehicle may additionally include an internal combustion engine that provides running power by fuel. The vehicle is also called a hybrid vehicle, a plug-in hybrid vehicle, a battery-electric vehicle, etc. The vehicle may be a ship that travels on water, an aircraft that travels in the air, or a spacecraft in outer space.

[0015] The power system 1 includes a power unit 2, a battery 3, an output shaft 4, and drive wheels 5. The output shaft 4 is called a countershaft or the like in a vehicle. The output shaft 4 is called a propeller shaft or the like in a ship or aircraft.

[0016] The power unit 2 is provided between the battery 3 and the output shaft 4. The power unit 2 provides bidirectional conversion between electric power and mechanical power. The power unit 2 may also provide unidirectional conversion between electric power and mechanical power.

[0017] The battery 3 is a DC power source. In this embodiment, the battery 3 is a secondary battery that can be charged and discharged. The DC power source can be various batteries, such as a lead-acid battery, a lithium-ion battery, or a nickel-cadmium battery. Furthermore, the DC power source may be provided by a fuel cell. The negative electrode of the battery 3 is connected to the ground potential of the power system 1 via a ground connection 3a.

[0018] The power unit 2 has a housing 6. The housing 6 has electrical conductivity that allows a current induced by noise radiation described below to flow. The housing 6 is made of metal. It is desirable that the metal forming the housing 6 is at least electrically conductive or magnetic. It is desirable that the metal forming the housing 6 is both electrically conductive and magnetic. The housing 6 can be provided by a material that electromagnetically shields noise radiation described below. The housing 6 can be provided by a multilayer material that includes a layer of an electromagnetic shielding material in a portion thereof. The layer of the electromagnetic shielding material can be provided by a variety of materials such as a metal plate, a thin film, or an iron plate.

[0019] In this embodiment, the housing 6 is made of a metal containing aluminum as a main component, and is a molded product formed into a predetermined shape by a so-called aluminum die casting method.

[0020] The housing 6 contains the electrical components, the rotating electric machine, and the mechanical components. The housing 6 connects the electrical components, the rotating electric machine, and the mechanical components such that they can be handled as a single unit. The housing 6 provides an integral element that connects the electrical components and the mechanical components together. The housing 6 is connected to the ground potential of the power system 1 via a ground connection 6a.

[0021] The housing 6 divides a chamber 7 that mainly houses circuit elements and a chamber 8 that mainly houses a rotating electric machine. In addition, the housing 6 divides a chamber 9 that mainly houses mechanical elements. The chamber 7 is also called a circuit chamber that houses electric circuit elements 20. The chamber 8 is also called an electric machine chamber that houses a rotating electric machine 30. The chamber 9 is also called a machine chamber that provides mechanical power transmission elements 40. In this embodiment, the power unit 2 may be called a transaxle unit or the like. The power unit 2 is integrally mounted with the circuit element 20 as a power control device by housing it inside the housing 6. Therefore, the housing 6 connects the power control device (circuit element 20), the rotating electric machine 30, and the power transmission element 40 as a unit. The power unit 2 may be called a circuit-integrated transaxle unit.

[0022] The circuit element 20 is electrically connected and disposed between the battery 3 and the rotating electric machine 30. The circuit element 20 provides bidirectional or unidirectional conversion between DC and AC. Furthermore, the circuit element 20 provides DC power regulation and / or AC power regulation. The circuit element 20 provides DCAC conversion to convert DC power supplied from the battery 3 into AC power and supply it to the rotating electric machine 30. Furthermore, the circuit element 20 provides ACDC conversion to convert AC power supplied from the rotating electric machine 30 into DC power and charge the battery 3.

[0023] The circuit element 20 provides a power control device. The circuit element 20 converts power. The circuit element 20 is also called a power conversion device. The circuit element 20 includes a power conversion circuit (PCON) 21. The power conversion circuit 21 may include a converter circuit and / or an inverter circuit. The power conversion circuit 21 is connected and arranged in series between the battery 3 and the rotating electric machine 30. Furthermore, the power conversion circuit 21 has a control circuit for the converter circuit and / or the inverter circuit. The control circuit may include a driver circuit that generates a signal for driving a plurality of switching elements included in the power conversion circuit 21. The control circuit may include a current sensor circuit for monitoring the operating state of the power conversion circuit 21. Furthermore, the control circuit may include a control device that controls the plurality of switching elements. The entire control function of the control device may be provided by the circuit element 20. Also, a part of the control function of the control device may be arranged outside the circuit element 20.

[0024] The control device in this specification may also be called an electronic control unit (ECU). The control device or control system is provided by (a) an algorithm as a plurality of logics called if-then-else format, or (b) an algorithm as a trained model tuned by machine learning, for example, a neural network.

[0025] The control device is provided by a control system including at least one computer. The control system may include multiple computers linked by data communication devices. The computer includes at least one processor that is hardware (hardware processor). The hardware processor may be provided by: (i), (ii) or (iii) below.

[0026] (i) The hardware processor may be at least one processor core that executes a program stored in at least one memory. In this case, the computer is provided with at least one memory and at least one processor core. The processor core is called a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a RISC-CPU, etc. The memory is also called a storage medium. The memory is a non-transient and tangible storage medium that non-temporarily stores "programs and / or data" that can be read by the processor. The storage medium is provided by a semiconductor memory, a magnetic disk, an optical disk, or the like. The program may be distributed alone or as a storage medium on which the program is stored.

[0027] (ii) The hardware processor may be a hardware logic circuit. In this case, the computer is provided by a digital circuit including a large number of programmed logic units (gate circuits). The digital circuit is also called a logic circuit array, for example, ASIC: Application-Specific Integrated Circuit, FPGA: Field Programmable Gate Array, SoC: System on a Chip, PGA: Programmable Gate Array, CPLD: Complex Programmable Logic Device, etc. The digital circuit may include a memory that stores programs and / or data. The computer may be provided by an analog circuit. The computer may be provided by a combination of digital and analog circuits.

[0028] (iii) The hardware processor may be a combination of (i) and (ii) above. (i) and (ii) may be located on different chips or on a common chip. In these cases, the (ii) part may also be called an accelerator.

[0029] The circuit element 20 includes conductive members 22 and 23. The conductive members 22 and 23 are members for passing the current to be converted. The conductive members 22 and 23 are provided by bus bars. The bus bars can be provided by a metal mainly composed of copper or a metal mainly composed of aluminum. The conductive members 22 and 23 may be arranged vertically and horizontally within the circuit element 20 to enable efficient current flow.

[0030] The conductive member 22 is disposed between the battery 3 and the power conversion circuit 21. The conductive member 22 is also called a first conductive member. The conductive member 22 provides a first power line through which mainly DC flows. The conductive member 22 is also called a DC conductive member. The conductive member 22 is disposed to penetrate the insulating member 14. The insulating member 14 provides electrical insulation in the wall 12. The conductive member 22 electrically connects between the battery 3 and the power conversion circuit 21. The insulating member 14 is disposed in a part of the wall 12 so as to penetrate the wall 12. As a result, the conductive member 22 is disposed to penetrate the wall 12 of the housing 6. The wall 12 is a wall suitable for connection to the battery 3 among a plurality of walls that divide the chamber 7. The wall 12 is a wall that separates the chamber 7 from the outside of the housing 6. In the illustrated example, the wall 12 is a side wall facing in the lateral direction of the housing 6.

[0031] The conductive member 23 is disposed between the power conversion circuit 21 and the rotating electric machine 30. The conductive member 23 is also called a second conductive member. The conductive member 23 provides a second power line in which mainly AC flows as a current different from the current flowing through the first power line. The conductive member 23 is also called an AC conductive member. The conductive member 23 is disposed to penetrate the insulating member 15. The insulating member 15 provides electrical insulation in the wall 13. The conductive member 23 electrically connects between the power conversion circuit 21 and the rotating electric machine 30. The insulating member 15 is disposed in a part of the wall 13 so as to penetrate the wall 13. As a result, the conductive member 23 is disposed to penetrate the wall 13 of the housing 6. The wall 13 is one of a plurality of walls that divide the chamber 7. The wall 13 is a partition wall that divides the chamber 7 and the chamber 8. In the illustrated example, the wall 13 is a bottom wall disposed between the chamber 7 and the chamber 8.

[0032] The conductive member 23 has a penetrating portion 23a and a laying portion 23b. The penetrating portion 23a extends along the thickness direction of the wall 13 to penetrate the wall 13. In the illustrated example, the penetrating portion 23a extends along the Y direction. The penetrating portion 23a extends over a relatively short length that is less than half of the total length of the conductive member 23 in the current direction. The laying portion 23b is laid along the wall 13. The laying portion 23b lays the conductive member 23 along the wall 13 as the bottom wall of the chamber 7. In the illustrated example, the laying portion 23b extends along the X direction. The laying portion 23b may include a portion that extends along the XZ plane. The laying portion 23b extends over a relatively long length that is more than half of the total length of the conductive member 23. Between the penetrating portion 23a and the laying portion 23b, a bent portion 23c that changes the direction in which the conductive member 23 extends is provided. In the illustrated example, the bent portion 23c is a portion that is bent at a right angle.

[0033] In the illustrated example, the conductive member 22 does not have a clear boundary between the penetrating portion and the laid portion. Instead, the conductive member 22 may have a penetrating portion and an laid portion, similar to the conductive member 23.

[0034] The circuit element 20 includes a plurality of noise filters 50. The plurality of noise filters 50 are arranged at input / output ends of the circuit element 20. The circuit element 20 has one noise filter 50 arranged at an input / output end for DC power that can operate the rotating electric machine 30. The circuit element 20 has one noise filter 50 arranged at an input / output end for AC power that can operate the rotating electric machine 30. Although not shown, the circuit element 20 may have one noise filter 50 at an input / output end for a control signal.

[0035] The circuit element 20 includes a core 51 and a core 52 that provide a plurality of noise filters 50. The cores 51 and 52 are cylindrical. The cores 51 and 52 are arranged to surround the corresponding conductive members 22 and 23 in an annular shape. The cores 51 and 52 can be provided by a single annular member that surrounds the plurality of conductive members 22 and 23 as a bundle. The core 51 may be provided by a plurality of annular members that individually surround each of the plurality of conductive members 22, or a member having a plurality of annular portions. Similarly, the core 52 may be provided by a plurality of annular members that individually surround each of the plurality of conductive members 23, or a member having a plurality of annular portions.

[0036] The core 51 or the core 52 may be formed of a plurality of partial members arranged in an annular shape to surround the corresponding conductive member. For example, one core may be provided as an assembly of two semi-cylinders. Also, one core may be provided as an assembly of two bracket-type members arranged opposite each other. The cores 51 and 52 may be formed in an annular shape using various shapes and combinations other than those exemplified here.

[0037] The core 51 is provided on the conductive member 22 serving as a first power line. The core 51 is arranged in association with the conductive member 22 for DC. The core 51 is called a first core or a DC core. The core 51 passes magnetic flux induced in the conductive member 22 and is electromagnetically coupled with the conductive member 22 to form a low-pass filter.

[0038] The core 51 is supported by a wall 12 that separates the chamber 7 from the outside. The wall 12 is a wall through which the conductive member 22 passes. The core 52 is disposed so as to surround the conductive member 23 in an annular shape.

[0039] The core 52 is provided on the conductive member 23 as a second power line. The core 52 is arranged in association with the AC conductive member 23. The core 52 is called a second core or an AC core. The core 51 passes magnetic flux induced in the conductive member 22 and is electromagnetically coupled with the conductive member 22 to form a low-pass filter.

[0040] The core 52 is supported by the wall 13 that separates the chamber 7 from the chamber 8. This wall 13 is the wall through which the conductive member 23 should pass. Thus, the core 52 is disposed on the wall 13 that defines the connection boundary from the circuit element 20 to the rotating electric machine 30, in other words, the entrance to the rotating electric machine 30. The cores 51, 52 can be supported by the walls 12, 13 by various means such as adhesion, engagement, fastening, placement, etc.

[0041] The cores 51 and 52 are made of a magnetic material such as ferrite. The cores 51 and 52, together with the conductive members 22 and 23 disposed therethrough, form an inductor that attenuates high-frequency noise. The inductor exhibits a higher impedance as the component of the current flowing through the conductive member becomes higher in frequency. As a result, the cores 51 and 52 attenuate the high-frequency component (high-frequency noise) of the current flowing through the conductive member.

[0042] 1, a shielding member that suppresses electromagnetic mutual coupling between the cores 51 and 52 is disposed between the cores 51 and 52. For the shielding member, see the description given later.

[0043] The rotating electric machine 30 includes a stator 31 and a rotor 32. The stator 31 and the rotor 32 are electromagnetically coupled. The rotating electric machine 30 can function in a power running mode and a regenerative mode. In the power running mode, the electric power supplied to the stator 31 generates a rotating magnetic field. The rotor 32 is rotated by this rotating magnetic field. The rotation of the rotor 32 is transmitted to the output shaft 4 via the power transmission element 40. At this time, the rotating electric machine 30 converts the electric power into kinetic energy. In the regenerative mode, the rotation of the output shaft 4 is transmitted to the rotating electric machine 30 by the power transmission element 40. The field magnet of the rotating electric machine 30 induces electric power in the stator 31. At this time, the rotating electric machine 30 converts the kinetic energy into electric power.

[0044] An example of the rotating electric machine 30 is an electric motor. Another example of the rotating electric machine 30 is a generator motor (MG). An example of the rotating electric machine 30 is an AC rotating electric machine. An example of the rotating electric machine 30 is a multi-phase AC rotating electric machine. In this embodiment, the rotating electric machine 30 is a three-phase AC rotating electric machine.

[0045] The power transmission element 40 of the power unit 2 is mechanically disposed between the rotating electric machine 30 and the output shaft 4. The power transmission element 40 operatively connects the rotor 32 of the rotating electric machine 30 to the output shaft 4. In the power running mode, the power transmission element 40 transmits power from the rotating electric machine 30 to the output shaft 4 as indicated by the dashed arrow. In the regenerative mode, the power transmission element 40 transmits power from the output shaft 4 to the rotating electric machine 30. The power transmission element 40 may include at least one of a rotating shaft that transmits power, a plurality of gears that mesh with each other, a transmission, a differential mechanism that absorbs the rotation difference between the left and right drive wheels, and the like. The power transmission element 40 is also called a power transmission mechanism, a power train, and the like.

[0046] FIG. 2 is a perspective view showing a partial cross section of the housing 6 in the chamber 7. The conductive members 22, 23 and the cores 51, 52 are shown in the figure. In FIG. 2, a three-axis Cartesian coordinate system XYZ is shown. The Cartesian coordinate system XYZ is used to define the directions of a plurality of parts. The X direction and the Z direction correspond to the width direction and the depth direction that define the size of the chamber 7. In this example, for convenience, the X direction corresponds to the width direction, and the Z direction corresponds to the depth direction. The X direction and the Z direction are interchangeable. The Y direction defines the height of the chamber 7. Although not shown in FIG. 2, a shielding member that suppresses the electromagnetic interaction between the cores 51 and 52 is arranged between the cores 51 and 52. For the shielding member, refer to the description below.

[0047] The conductive member 22 is disposed penetrating the wall 12 between the chamber 7 and the outside. The conductive member 22 is disposed so as to extend mainly along the X direction (the horizontal direction in the figure) at the portion where it penetrates the wall 12. The core 51 is supported by the wall 12. The cylindrical shape of the core 51 defines an axis 51a. The axis 51a is defined by the axial direction of a through hole that characterizes the cylindrical shape. The axis 51a extends along the X direction. The axis 51a intersects the wall 12. The axis 51a is perpendicular to the wall 12.

[0048] The conductive member 23 is disposed penetrating the wall 13 between the chambers 7 and 8. The conductive member 23 is disposed so as to extend mainly along the Y direction (the vertical direction in the figure) at the portion where it penetrates the wall 13. The core 52 is supported by the wall 13. The cylindrical shape of the core 52 defines an axis 52a. The axis 52a is defined by the axial direction of the through hole that characterizes the cylindrical shape. The axis 52a extends along the Y direction. The axis 52a intersects the wall 13. The axis 52a is perpendicular to the wall 13.

[0049] The axis 51a and the axis 52a extend along different directions in space. The core 51 and the core 52 are arranged in the chamber 7 so that the axis 51a and the axis 52a are oriented in different directions in the chamber 7. As a result, the axis 51a of the core 51 does not point toward the core 52. Similarly, the axis 52a of the core 52 does not point toward the core 51. Such an arrangement may suppress the interaction between the core 51 and the core 52. In the illustrated example, the axis 51a and the axis 52a do not contact each other, but may contact each other. It is expected that the interaction between the magnetic field leaking from the core 51 and the magnetic field leaking from the core 52 is suppressed by the different directions of the axis 51a and the axis 52a.

[0050] In this embodiment, both of the cores 51 and 52 extend perpendicularly to the walls 12 and 13 that define the chamber 7 that houses the circuit element 20, and are disposed so as to surround the penetrating portions 23a of the corresponding conductive members 22 and 23 that penetrate the walls 12 and 13. Alternatively, only one of the cores 51 and 52 may extend perpendicularly to the walls 12 and 13 that define the chamber 7, and be disposed so as to surround the penetrating portions of the corresponding conductive members 22 and 23 that penetrate the walls 12 and 13.

[0051] FIG. 3 is a cross-sectional view showing the arrangement of the core 51 and the core 52 in the housing 6. An infinite number of imaginary straight lines can be assumed between the core 51 and the core 52. The relationship in which the core 51 and the core 52 are connected by straight lines can also be seen as a projection relationship between the core 51 and the core 52. A bundle of the infinite number of imaginary straight lines corresponds to a three-dimensional straight line projection range PR indicated by a dashed dotted line. Furthermore, a straight line projection plane PF perpendicular to any one of the imaginary straight lines can be assumed. The straight line projection plane PF provides an index for evaluating the cross section of the straight line projection range PR.

[0052] A wall member 60 is disposed between the core 51 and the core 52. The wall member 60 is a member that suppresses electromagnetic interaction between the core 51 and the core 52. In this embodiment, the wall member 60 is provided as a part of the housing 6. The housing 6 and the wall member 60 are provided by a continuous common material. Therefore, the wall member 60 is grounded by the ground connection 6a. The wall member 60 is one of a plurality of protruding walls of the housing 6 provided by an aluminum die casting method.

[0053] The wall member 60 has a protruding member 61 and a shielding member 62. The protruding member 61 protrudes from the housing 6. The protruding member 61 is located outside the linear projection range PR. The protruding member 61 is not located inside the linear projection range PR.

[0054] The shielding member 62 is integrally formed from a common material that is continuous with the protruding member 61. The shielding member 62 is also a part of the protruding member 61. The shielding member 62 is located inside the linear projection range PR. Furthermore, a part of the shielding member 62 may protrude outward from the linear projection range PR and terminate.

[0055] The shielding member 62 extends in a meandering manner between the cores 51 and 52. The shielding member 62 has a plurality of flat portions and a curved portion located between the two flat portions. The shielding member 62 has a plurality of flat portions and a plurality of curved portions arranged alternately. The plurality of curved portions provide the shielding member 62 with necessary mechanical strength.

[0056] The shielding member 62 extends so as to completely block the arrival of a virtual straight line from core 51 to core 52, and from core 52 to core 51. The shielding member 62 completely traverses the straight line projection range PR. The shielding member 62 completely divides the straight line projection range PR into two regions PR1 and PR2. The straight line projection range PR is divided by the shielding member 62 into a first region PR1 and a second region PR2. The shielding member 62 is conductive. The shielding member 62 is connected to ground.

[0057] The main part of the shielding member 62 is positioned inside the straight line projection range PR. Furthermore, a narrow part of the shielding member 62 extends from inside the straight line projection range PR to the outside. The shielding member 62 shields the virtual straight line between the core 51 and the core 52 in the entire cross section that crosses the straight line projection range PR. In other words, the shielding member 62 has an extent that divides the straight line projection range PR into an area where the core 51 is positioned and an area where the core 52 is positioned. The extent of the shielding member 62 covers 100% of the straight line projection plane PF. The shielding ratio by the shielding member 62 in the straight line projection range PR can be converted into the ratio projected on the straight line projection plane PF. In the illustrated example, the shielding ratio on the straight line projection plane PF is 100%.

[0058] The shielding member 62 captures noise radiation traveling from one core to the other core. The shielding member 62 drops the captured noise radiation to the ground potential. A part of the noise radiation captured by the shielding member 62 may be lost due to eddy currents induced in the shielding member 62. A part of the noise radiation captured by the shielding member 62 is lost due to losses associated with electromagnetic induction in the shielding member 62. Therefore, the noise radiated from the cores 51 and 52 may be converted into thermal energy and attenuated. As a result, the electromagnetic interaction (including electromagnetic interference and electromagnetic mutual coupling) between the cores 51 and 52 is suppressed. The noise suppression effect that the core 51 would normally exhibit can also be called the noise suppression effect expected of the core 51. The noise suppression effect that the core 52 would normally exhibit can also be called the noise suppression effect expected of the core 52. In this embodiment, both the noise suppression effect expected of the core 51 and the noise suppression effect expected of the core 52 can be exhibited without impairing them.

[0059] According to the embodiment described above, the electromagnetic interaction between the cores 51 and 52 is suppressed by the shielding member 62. From one perspective, the electromagnetic interaction may be understood as electromagnetic interference between the cores 51 and 52. In this case, the shielding member 62 suppresses the electromagnetic interference between the cores 51 and 52. From another perspective, the electromagnetic interaction may be understood as electromagnetic mutual coupling between the cores 51 and 52. In this case, the shielding member 62 suppresses the electromagnetic mutual coupling between the cores 51 and 52.

[0060] The electromagnetic interaction between the cores 51 and 52 may include an electromagnetic action from the core 52 to the core 51. In this case, from one point of view, the noise suppression effect that the core 51 receiving the interaction would normally exhibit may be modulated and reduced. In this case, from another point of view, the noise suppression effect that the core 52 providing the interaction would normally exhibit may be modulated and reduced. From one point of view, the shielding member 62 suppresses a situation in which the noise suppression effect of the core 51 receiving the interaction is reduced due to the interaction between the cores 51 and 52. From another point of view, the shielding member 62 suppresses a situation in which the noise suppression effect of the core 52 providing the interaction is reduced due to the interaction between the cores 51 and 52.

[0061] On the other hand, the electromagnetic interaction between the core 51 and the core 52 may include an electromagnetic action from the core 51 to the core 52. In this case, from one perspective, the noise suppression effect that the core 52 would normally exhibit may be modulated and reduced. In this case, from another perspective, the noise suppression effect that the core 51 would normally exhibit may be modulated and reduced. From one perspective, the shielding member 62 suppresses a situation in which the noise suppression effect of the core 52 is reduced due to the interaction between the core 51 and the core 52. From another perspective, the shielding member 62 suppresses a situation in which the noise suppression effect of the core 51 is reduced due to the interaction between the core 51 and the core 52.

[0062] The effect of the shielding member 62 in suppressing the decrease in the noise suppression effect may be manifested only in the core 51, only in the core 52, or in both the core 51 and the core 52. Thus, according to this embodiment, by providing the shielding member 62, the decrease in the noise suppression effect of the core 51 and / or the decrease in the noise suppression effect of the core 52 is suppressed. As a result, according to this embodiment, the noise suppression effect is exerted on both the input side and the output side of the power control device. Furthermore, the interaction between the input side noise filter and the output side noise filter of the power control device can be suppressed, and a predetermined noise suppression effect can be exerted in both noise filters.

[0063] Second embodiment This embodiment is a modification based on the previous embodiment. In the previous embodiment, the shielding member 62 is serpentine. Instead, in this embodiment, the power control device includes a shielding member 262.

[0064] In Fig. 4, the shielding member 262 is a flat plate. The shielding member 262 divides the straight line projection range PR into two regions PR1 and PR2 with a minimum width. The shielding member 262 also completely divides the straight line projection range PR into a first region PR1 and a second region PR2. A major portion of the shielding member 262 is positioned within the straight line projection range PR. Furthermore, a narrow portion of the end of the shielding member 262 extends outside the straight line projection range PR. As a result, the shielding member 262 exerts a shielding effect over 100% of the straight line projection surface PF.

[0065] Third embodiment This embodiment is a modification based on the previous embodiment. In the previous embodiment, the shielding ratio of the shielding member 262 to the linear projection plane PF is 100%. Instead, in this embodiment, the power control device includes a shielding member 362.

[0066] In FIG. 5, the shielding member 362 is a flat plate smaller than the shielding member 262. The shielding member 362 is positioned so as to cross only a part of the cross section that crosses the straight line projection range PR. The shielding ratio of the shielding member 362 to the straight line projection plane PF is 30%. The shielding ratio of the shielding member 362 to the straight line projection plane PF can be set in the range of 30% to 100%. Therefore, the wall member 60 occupies an area ratio of 30% to 100% on the straight line projection plane PF perpendicular to any straight line assumed between the cores 51 and 52.

[0067] In this embodiment as well, the electromagnetic interaction between the cores 51 and 52 is suppressed by the shielding member 362. As a result, the noise suppression effect of the cores 51 and 52 is prevented from decreasing.

[0068] Fourth embodiment This embodiment is a modification based on the preceding embodiment. In the preceding embodiment, the core 51 is arranged such that the axis 51a extends in the X direction. The core 52 is arranged such that the axis 52a extends in the Y direction. Instead, in this embodiment, the power control device includes a core 451 and a core 452.

[0069] 6, the core 451 has a hole through which the conductive member 22 is disposed. The core 451 has an axis 451a defined by the axis of the hole. The axis 451a extends along the Z direction. The core 451 is supported by the wall 12 that provides a boundary between the chamber 7 and the outside. The core 451 is supported by the wall 12 such that the axis 451a is disposed along the Z direction.

[0070] The first conductive member 22 has a penetrating portion 22a, an installed portion 22b, and a bent portion 22c. The penetrating portion 22a extends perpendicularly to the wall 12. The penetrating portion 22a is disposed so as to penetrate the wall 12. The installed portion 22b is disposed along the wall 12. The installed portion 22b is installed between the power conversion circuit 21 and the penetrating portion 22a. Between the penetrating portion 22a and the installed portion 22b, a bent portion 22c is provided, which changes the direction in which the conductive member extends. In the illustrated embodiment, the bent portion 22c is a right-angled bent portion.

[0071] Core 451 is provided so as to surround penetrating portion 22a, which is shorter than laid portion 22b. Core 451 disposed in penetrating portion 22a contributes to suppressing noise radiation.

[0072] The core 452 has a hole through which the conductive member 23 is disposed. The core 452 has an axis 452a defined by the axis of the hole. The axis 452a extends along the X direction. The core 452 is supported by the wall 13 which provides a boundary separating the chambers 7 and 8. The core 452 is supported by the wall 13 such that the axis 452a is disposed along the X direction.

[0073] In the preceding embodiment, the core 52 is provided so as to surround the penetrating portion 23a. Instead, the core 452 in this embodiment is provided so as to surround the laid portion 23b. The core 452 is disposed in a position of the laid portion 23b close to the bent portion 23c. In other words, the core 452 is disposed in a position of the laid portion 23b adjacent to the penetrating portion 23a. The core 452 disposed in the laid portion 23b close to the penetrating portion 23a may contribute to suppressing noise radiation.

[0074] In this embodiment, the cores 451 and 452 are supported such that the axes 451a and 452a are disposed along the XZ plane. From another perspective, the cores 451 and 452 are disposed in the chamber 7 such that the axes 451a and 452a are oriented in different directions from each other in the chamber 7. According to this embodiment, it may be possible to suppress a situation in which the interaction between the cores 451 and 452 impairs the noise suppression effect of the cores 451 and / or 452.

[0075] Although not shown in Fig. 6, a shielding member for suppressing electromagnetic interaction between core 451 and core 452 is disposed between core 451 and core 452. For the shielding member, the above description can be referred to. Furthermore, the shielding member contributes to suppressing electromagnetic interaction between core 451 and core 452 even in the relative positional relationship between axis 451a and axis 452a illustrated in this embodiment.

[0076] Fifth embodiment This embodiment is a modification based on the preceding embodiment. In the preceding embodiment, the shielding members 62, 262, 362 are integrally formed with the housing 6 by a common material that is continuous with the housing 6. Instead, in this embodiment, the power control device includes a shielding member 562 that is separate from the housing 6.

[0077] 7, the wall member 60 has a protruding member 61, a shielding member 62, and a shielding member 562. The shielding member 562 is also called an additional shielding member that is additional to the shielding member 62, or a second shielding member in which the shielding member 62 is the first shielding member. The shielding member 562 is a separate part independent of the protruding member 61 and the shielding member 62. The shielding member 562 is made of a magnetic material and a conductive metal.

[0078] The shielding member 562 can be formed of the same material as the protruding member 61. For example, the shielding member 562 is provided by a member formed by an aluminum die casting method. Alternatively, the shielding member 562 may be provided by a metal plate manufactured by bending a metal plate mainly composed of iron by press working or the like. For example, the shielding member 562 can be provided by a pressed iron plate. Alternatively, the shielding member 562 can be provided by a member having a thin metal film.

[0079] The shielding member 562 is arranged so as to incompletely cover and conceal the core 51 from the core 52. The shielding member 562 is arranged so as to incompletely encase the core 51. The shielding member 562 does not completely encase the core 51. The shielding member 562 encases the one core 51 so as to cover and conceal it from the core 52 on the side of the surface of the one core 51 facing the other core 52. However, on the side of the surface of the one core 51 opposite to the other core 52, at least a part of the core 51 is exposed from the shielding member 562. The shielding member 562 may also serve as a member supporting the core 51. The protruding member 61, the shielding member 62, and the shielding member 562 form one wall member 60 that is electromagnetically continuous. The protruding member 61, the shielding member 62, and the shielding member 562 cooperate to divide the straight line projection range PR between the cores 51 and 52 into an area PR1 located on the core 51 side and an area PR2 located on the core 52 side.

[0080] The protruding member 61, the shielding member 62, and the shielding member 562 are connected to each other by a connecting member 563. The connecting member 563 at least mechanically connects the shielding member 562 and the protruding member 61. The connecting member 563 can be provided by various members that mechanically connect the shielding member 62 and the shielding member 562. For example, one example of the connecting member 563 is a fastening member including a bolt and a nut. The connecting member 563 may be provided by a welding member that is re-solidified after melting at least one of the shielding member 62 and the shielding member 562. Furthermore, the connecting member 563 may be provided by an adhesive member interposed between the shielding member 62 and the shielding member 562.

[0081] The connecting member 563 electrically connects the shielding member 562 and the protruding member 61. The electrical connection may be provided by direct or indirect contact between the shielding member 562 and the protruding member 61. Furthermore, the electrical connection may be provided via the connecting member 563. The electrical connection between the shielding member 562 and the shielding member 62 may be provided by a conductor wire soldered to both of them.

[0082] In this embodiment, the shielding member 562 has a shape that encases the core 51. Alternatively, the shielding member 562 may be formed and arranged to encase the core 52. The power control device may additionally include a shielding member that encases the core 52.

[0083] The shielding members 62 and 562 contribute to suppressing electromagnetic interactions between the cores 51 and 452. As a result, the noise suppressing effect of the cores 51 and 52 is prevented from being reduced.

[0084] Sixth embodiment This embodiment is a variation of the previous embodiment, in which the shielding member 62, 262, 362, 562 incompletely encases the core. Instead, in this embodiment, the power control device includes a shielding member 662 that completely encases the core.

[0085] 8, the wall member 60 does not include the protruding member 61 integral with the housing 6, and the shielding member 62 integral with the housing 6. The shielding member 662 completely surrounds the core 51. The shielding member 662 is grounded via the housing 6 by the ground connection 6a.

[0086] The material forming the shielding member 662 is conductive. The material forming the shielding member 662 is magnetic. The shielding member 662 can be provided by a container formed by an aluminum die casting method or a pressed iron plate. Alternatively, the shielding member 662 can be provided by a member having a thin metal film. In this case, the thin metal film is formed in a layer on the surface or inside of a base material that defines the shape of the shielding member 662. The thin metal film can be provided by metal plating or a metal sheet material. The electrical connection between the shielding member 662 and the housing 6 can be provided by contact between the two or by a conductor wire soldered to both.

[0087] Alternatively or additionally, the power control device may include a shielding member that completely encases the core 52. In this structure, the shielding member also suppresses electromagnetic interactions between the cores 51 and 52.

[0088] In this embodiment as well, the shielding member 662 contributes to suppressing electromagnetic interaction between the cores 51 and 52. As a result, the deterioration of the noise suppression effect of the cores 51 and 52 is suppressed.

[0089] Other embodiments The disclosure in this specification and drawings, etc. is not limited to the exemplified embodiments. The disclosure includes the exemplified embodiments and modifications by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of parts and / or elements shown in the embodiments. The disclosure can be implemented by various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure includes the omission of parts and / or elements of the embodiments. The disclosure includes the substitution or combination of parts and / or elements between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. Some disclosed technical scopes are indicated by the description of the claims, and should be interpreted as including all modifications within the meaning and scope equivalent to the description of the claims.

[0090] The disclosure in the specification and drawings is not limited by the claims. The disclosure in the specification and drawings includes the technical ideas described in the claims, and extends to more diverse and broader technical ideas than the technical ideas described in the claims. Therefore, various technical ideas can be extracted from the disclosure in the specification and drawings without being bound by the claims.

[0091] In the preceding embodiment, the power control device is arranged with the wall member 60 to suppress electromagnetic interaction, taking the core 51 and the core 52 as an example. Alternatively, the power control device may have a plurality of cores providing a plurality of noise filters, such as three or four. For example, a noise filter including a core can be provided at a plurality of locations where electromagnetic noise radiation occurs. When the power control device has three or more cores, the wall member 60 may be arranged only between two representative cores. The shape and arrangement of the wall member 60 may be adjusted to maximize the noise suppression effect. For example, the circuit element as the power control device may include a first conductive member for direct current, a second conductive member for alternating current, and a third conductive member for a control signal. In this case, a plurality of cores as a plurality of noise filters are arranged in one-to-one correspondence to the plurality of conductive members. The first core is arranged in the first conductive member. The second core is arranged in the second conductive member. The third core is arranged in the third conductive member. In this case, the wall member 60 is disposed at least one of between the first core and the second core, between the first core and the third core, and between the second core and the third core.

[0092] (Disclosure of technical ideas) This specification discloses multiple technical ideas described in the following multiple dependent claims. Some of the claims may be described in a multiple dependent form, where the subsequent claim alternatively refers to the preceding claim. Furthermore, some of the claims may be described in a multiple dependent form, where the subsequent claim alternatively refers to the preceding claim. The claims described in these multiple dependent forms define multiple technical ideas.

[0093] (Technical thought 1) a first conductive member (22) for passing an electric current; a second conductive member (23) for passing a current different from that of the first conductive member; a first core (51) provided on the first conductive member as a noise filter; a second core (52) provided on the second conductive member as a noise filter; A power control device comprising: a shielding member arranged to at least partially shield the space between the first core and the second core; and a wall member (60) that suppresses electromagnetic effects from the first core to the second core and / or electromagnetic effects from the second core to the first core.

[0094] (Technical thought 2) The power control device according to technical idea 1, wherein the wall member is arranged in at least a portion of a linear projection range (PR) that is expected to be reached by a straight line between the first core and the second core.

[0095] (Technical Thought 3) A power control device according to technical idea 2, wherein the wall member occupies an area ratio of 30% or more and 100% or less on a linear projection plane perpendicular to any straight line assumed between the first core and the second core.

[0096] (Technical Thought 4) The power control device according to any one of Technical Ideas 1 to 3, wherein the wall member converts noise radiated from the first core or the second core into thermal energy and attenuates it.

[0097] (Technical Thought 5) The power control device according to any one of Technical Ideas 1 to 4, wherein the wall member is connected to ground.

[0098] (Technical Thought 6) The power control device according to any one of Technical Ideas 1 to 5, wherein the wall member is conductive and / or magnetic.

[0099] (Technical Thought 7) The power control device according to any one of Technical Ideas 1 to 6; a rotating electric machine (30) whose input and output power is controlled by the power control device; a power transmission element (40) operatively connecting the rotating electric machine and an output shaft (4); A power unit comprising the power control device, the rotating electric machine, and a housing (6) that integrally connects the power transmission elements.

[0100] (Technical Thought 8) The housing defines a circuit chamber (7) that houses the power control device and an electric machine chamber (8) that houses the rotating electric machine, the first core is supported by a wall that separates the circuit chamber from the outside of the housing, A power unit according to Technical Idea 7, wherein the second core is supported by a wall that separates the circuit chamber and the electric machine chamber.

[0101] (Technical Thought 9) the first core is cylindrical and disposed so as to surround the first conductive member, the second core is cylindrical and disposed so as to surround the second conductive member, A power unit described in technical idea 8, wherein the first core and the second core are arranged in the circuit chamber such that the axis (51a) of the first core and the axis (52a) of the second core point in different directions from each other in the circuit chamber.

[0102] (Technical Thought 10) A power unit described in technical idea 8 or 9, wherein the first core and / or the second core extend perpendicularly to the wall defining the circuit chamber among the corresponding first conductive members and / or second conductive members and are arranged so as to surround the penetrating portions (22a, 23a) that penetrate the wall. [Explanation of symbols]

[0103] 1 power system, 2 power unit, 3 battery, 3a ground connection, 4 output shaft, 5 drive wheel, 6 housing, 6a ground connection, 7, 8, 9 chambers, 12, 13 wall; 14, 15 insulating member; 20 circuit element, 21 power conversion circuit, 22 conductive member, 23 Conductive member, 23a: penetration portion; 23b: laying portion; 23c: bend portion; 30 rotating electric machine, 31 stator, 32 rotor, 40 Power transmission elements, 50 noise filters, 51 core, 51a axis, 52 core, 52a axis, 60 wall member, 61 protruding member, 62 shielding member, 262 Shielding members, 362 Shielding members, 452 core, 452a axis, 562 Shielding member, 563 Connecting member, 662 Shielding members, PR Linear projection range, PR1 First area, PR2 Second area, PF Linear projection plane.

Claims

1. A first conductive member (22) for carrying an electric current; a second conductive member (23) for passing a current different from that of the first conductive member; a first core (51) as a noise filter provided on the first conductive member; a second core (52) provided on the second conductive member as a noise filter; A power control device comprising: a shielding member arranged to at least partially shield the space between the first core and the second core; and a wall member (60) that suppresses electromagnetic effects from the first core to the second core and / or electromagnetic effects from the second core to the first core.

2. The power control device according to claim 1 , wherein the wall member is arranged in at least a part of a linear projection range (PR) that is assumed to be reached by a straight line between the first core and the second core.

3. The power control device according to claim 2 , wherein the wall member occupies an area ratio of 30% or more and 100% or less on a linear projection plane perpendicular to any straight line assumed between the first core and the second core.

4. 4. The power control device according to claim 1, wherein the wall member converts noise radiated from the first core or the second core into thermal energy and attenuates the noise.

5. The power control device according to claim 1 , wherein the wall member is connected to ground.

6. The power control device according to claim 1 , wherein the wall member is conductive and / or magnetic.

7. The power control device according to any one of claims 1 to 3; A rotating electric machine (30) whose input and output power is controlled by the power control device; a power transmission element (40) operatively connecting the rotating electric machine and an output shaft (4); A power unit comprising the power control device, the rotating electric machine, and a housing (6) that integrally connects the power transmission elements.

8. The housing defines a circuit chamber (7) that houses the power control device and an electric machine chamber (8) that houses the rotating electric machine, The first core is supported by a wall (12) that separates the circuit chamber from the outside of the housing, 8. A power unit according to claim 7, wherein the second core is supported by a wall (13) that separates the circuit chamber and the electric machine chamber.

9. The first core is cylindrical and disposed so as to surround the first conductive member, The second core is cylindrical and disposed so as to surround the second conductive member, 9. The power unit according to claim 8, wherein the first core and the second core are arranged in the circuit chamber such that an axis (51 a) of the first core and an axis (52 a) of the second core point in different directions from each other in the circuit chamber.

10. A power unit as described in claim 8, wherein the first core and / or the second core extend perpendicularly to the wall that defines the circuit chamber of the corresponding first conductive member and / or the second conductive member and are arranged to surround a penetrating portion (22a, 23a) that penetrates the wall.

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