Filter unit and power conversion device

Abstract

A filter unit (100) includes a cylindrical filter core (7) through which bus bars (9) of positive and negative power supply side conductors of a power conversion device are inserted, a resin housing (6) that holds the filter core, and a noise removing capacitor unit (10) that is electrically connected to the bus bars. The resin housing has a terminal table portion (30) that connects the bus bars, and the terminal table portion is located radially outside the filter core and is arranged so as to overlap the filter core at least in part as viewed from the radially outer side.

Description

Technical Field

[0001] This invention relates to filter units and power conversion devices. Background Technology

[0002] For example, Patent Document 1 discloses a power conversion device that reduces the inductance of a noise filtering circuit to achieve high output. The power conversion device disclosed in Patent Document 1 includes a power supply side conductor connected to a high-voltage battery and a core component through which the power supply side conductor passes. This core component suppresses electromagnetic noise by absorbing fluctuations in the current flowing through the power supply side conductor.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6838775 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] The power conversion device disclosed in Patent Document 1 includes busbars such as a positive power side conductor and a negative power side conductor. In the power conversion device disclosed in Patent Document 1, the positive power side conductor and the negative power side conductor are inserted into a ring-shaped core component. Such busbars such as the positive power side conductor and the negative power side conductor are connected to the terminals of the storage battery. Although not disclosed in Patent Document 1, such busbars such as the positive power side conductor and the negative power side conductor are fixed to a terminal block and connected to the terminals of the storage battery via the terminal block. Therefore, in the power conversion device of Patent Document 1, the terminal block needs to be provided separately from the resin component that holds the core component, and the terminal block is a part of the housing of the power conversion device.

[0008] The present invention was made in view of the above-mentioned problems, and in a power conversion device having a busbar inserted into a cylindrical filter core, the terminal block used to fix the busbar inserted into the filter core can be reduced.

[0009] Technical solutions for solving technical problems

[0010] As a means to solve the above-mentioned problems, the present invention adopts the following structure.

[0011] The first aspect of the present invention adopts the following structure: comprising: a cylindrical filter core for insertion into a busbar; a resin housing for holding the filter core; and a noise removal capacitor unit electrically connected to the busbar. The resin housing has a terminal block portion for connection to the busbar, the terminal block portion being located radially outward of the filter core and configured to at least partially overlap with the filter core when viewed from the radially outward side.

[0012] The second aspect of the present invention, based on the first aspect described above, adopts the following structure: it has a power terminal connected to a storage battery, converts the power passing through the power terminal, and the power terminal has a filter unit of the first aspect described above for suppressing electromagnetic noise.

[0013] Invention Effects

[0014] In this invention, the resin housing holding the filter core has a terminal block portion for connecting the busbar. Therefore, this invention eliminates the need for a separate terminal block from the resin housing. Thus, according to this invention, in a power conversion device having a busbar inserted into a cylindrical filter core, the terminal block for fixing the busbar can be reduced. Attached Figure Description

[0015] Figure 1 This is a circuit diagram illustrating the electrical schematic structure of a power conversion device according to an embodiment of the present invention.

[0016] Figure 2 This is an exploded perspective view schematically illustrating the structural outline of a power conversion device according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic perspective view of the power supply terminals provided in a power conversion device according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic exploded perspective view of the power supply terminals provided in a power conversion device according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic perspective view showing the resin casing of the power supply terminal provided in a power conversion device according to an embodiment of the present invention.

[0020] Figure 6 This is a schematic perspective view showing a modified example of the power supply terminals provided by a power conversion device according to an embodiment of the present invention, including a resin housing.

[0021] Figure 7 This is a schematic circuit diagram of the power supply terminals provided in a power conversion device according to an embodiment of the present invention. Detailed Implementation

[0022] Hereinafter, an embodiment of the filter unit and power conversion device of the present invention will be described with reference to the accompanying drawings.

[0023] Figure 1This is a circuit diagram showing the schematic electrical structure of the power conversion device 1 according to this embodiment. The power conversion device 1 of this embodiment is mounted in a vehicle such as an electric vehicle and is positioned between the motor M and the battery B. The power conversion device 1 of this embodiment performs power conversion between the motor M and the battery B. For example, the power conversion device 1 of this embodiment converts the direct current supplied from the battery B into three-phase alternating current and supplies it to the motor M. Additionally, the power conversion device 1 converts regenerated electricity (alternating current) from the motor M into direct current and supplies it to the battery B.

[0024] like Figure 1 As shown, the power conversion device 1 of this embodiment includes a power conversion circuit H. The power conversion circuit H converts direct current (DC) to alternating current (AC) as described above. Additionally, the power conversion circuit H converts AC to DC. This power conversion circuit H includes a capacitor C, an inverter circuit E, and a noise filter F. Furthermore, the power conversion device 1 may also include, for example, a buck-boost converter (not shown), a DC-DC converter, or the like.

[0025] Furthermore, the power conversion device 1 of this embodiment includes a conductive line BU for power conduction. For example, the power conversion device 1 of this embodiment includes a conductive line BU connecting the inverter circuit E and the battery B, and a conductive line BU connecting the inverter circuit E and the motor M.

[0026] like Figure 1 As shown, the inverter circuit E has three bridge arms R corresponding to each motor M. Each bridge arm R has an upper arm HA and a lower arm LA. The upper arm HA is connected to the positive terminal of the battery B via a conductive line BU. The lower arm LA is connected to the negative terminal of the battery B via a conductive line BU. These upper arms HA and lower arms LA are connected in series. An output terminal connecting the bridge arm R to the motor M is connected between the upper arms HA and the lower arms LA.

[0027] In addition, such as Figure 1 As shown, the power conversion device 1 of this embodiment includes power devices D (semiconductor substrates) corresponding to each bridge arm R. That is, in this embodiment, the power conversion device 1 has three power devices D. Each power device D has a power transistor corresponding to the upper arm HA and a power transistor corresponding to the lower arm. That is, in this embodiment, each power device D has two power transistors. These power transistors are formed using multiple semiconductor elements. Such semiconductor elements are, for example, IGBTs (Insulated Gate Bipolar Transistors). Alternatively, the semiconductor elements may also be semiconductor elements using SiC (silicon carbide) or GaN (gallium nitride).

[0028] In addition, such as Figure 1As shown, the power conversion device 1 of this embodiment is equipped with a noise filter F that surrounds the conductive line BU connected to the positive terminal side of the battery B and the conductive line BU connected to the negative terminal side of the battery B. This noise filter F suppresses changes in the current flowing through the conductive line BU and suppresses the generation of electromagnetic noise.

[0029] Figure 2 This is an exploded perspective view schematically showing the structure of the power conversion device 1 according to this embodiment. (See attached image.) Figure 2 As shown, the power conversion device 1 of this embodiment includes an inverter housing 2, a smart power module 3, a capacitor unit 4, and a power supply terminal 5. Furthermore, the power conversion device 1 may also include other components such as a reactor unit forming a buck-boost circuit and a DC-DC converter unit forming a DC-DC converter.

[0030] The inverter housing 2 houses the intelligent power module 3, capacitor unit 4, and power terminals 5, and includes a central plate 2a and a housing cover 2b. These central plate 2a and housing cover 2b are detachably separable. Furthermore, in... Figure 2 The diagram shows the housing 2b separated upwards from the central plate 2a. However, the mounting position of the power conversion device 1 is not particularly limited. That is, the power conversion device 1 can also be mounted on the vehicle with the housing 2b located to the side of the central plate 2a.

[0031] The central plate 2a has a bottom wall portion that fixes the intelligent power module 3, capacitor unit 4, and power terminal 5, and a side wall portion that surrounds the intelligent power module 3, capacitor unit 4, and power terminal 5. That is, the central plate 2a is formed into a container shape with an opening on the side of the housing cover 2b. Such a central plate 2a is provided with water channels as needed, forming a structure capable of guiding coolant to cool the intelligent power module 3, capacitor unit 4, and power terminal 5.

[0032] The housing cover 2b is fixed to the central plate 2a, covering the intelligent power module 3 and the capacitor unit 4. That is, the intelligent power module 3 and the capacitor unit 4 are exposed by detaching from the central plate 2a through the housing cover 2b.

[0033] Such an inverter housing 2 is, for example, fixed relative to a casing (not shown) covering the motor M, and to a gearbox housing the gears that transmit the power generated by the motor M to the outside. In such a case, for example, a central plate 2a is fastened to the motor housing and gearbox using bolts (not shown). Alternatively, if the casing covering the motor M has space to house the power conversion device 1, the housing cover 2b may be omitted.

[0034] Additionally, the inverter housing 2 holds a busbar that forms a conductive line BU connecting the power terminal 5 to the smart power module 3 and the capacitor unit 4 (see reference). Figure 1 The unshown conductive line BU connects the intelligent power module 3 to the motor M (see reference). Figure 1 Part of ). Additionally, in Figure 1 These busbars have been omitted from the text.

[0035] The intelligent power module 3 comprises a power module 3a and a substrate unit 3b. The power module 3a is a module equipped with multiple power devices D, which will be described later. That is, the power module 3a forms an inverter circuit E through the multiple power devices D.

[0036] Substrate unit 3b is stacked on power module 3a. This substrate unit 3b includes, for example, a gate driver substrate and an ECU (Electronic Control Unit) substrate. The gate driver substrate is a substrate in which a gate driver is provided to generate drive signals for the inverter circuit E formed by power module 3a. The ECU substrate is a substrate in which an ECU is provided to control the gate driver substrate.

[0037] Capacitor unit 4 is a unit that internally houses capacitor elements. This capacitor unit 4 is connected to power module 3a. Additionally, it is connected to power terminal 5 via a busbar (not shown). This capacitor unit 4 is formed... Figure 1 The capacitor C shown is shown.

[0038] The power terminal 5 is a connection component that connects to the battery B of the power conversion device 1 in this embodiment. A terminal portion of a wiring harness (not shown) connected to the battery B is inserted into the interior of the inverter housing 2. The power terminal 5 is connected to the battery B by fastening it to this wiring harness.

[0039] Figure 3 This is a schematic perspective view of power terminal 5. Additionally, Figure 4 This is a schematic exploded perspective view of the power terminal 5. As shown in these figures, the power terminal 5 of this embodiment includes a resin housing 6, a filter core 7, a core cover 8, a busbar 9, a noise removal capacitor unit 10, a conductive component 11, and a frame grounding connection component 12.

[0040] Figure 5 This is a schematic perspective view of the resin casing 6. (Example) Figures 3-5 As shown, the resin housing 6 is a component that holds the filter core 7 and is mainly formed of resin. In this embodiment, the resin housing 6 also functions as a terminal block for fastening the busbar 9. In this embodiment, the resin housing 6 has a core holding portion 20, a terminal block portion 30, and a fixing portion 40.

[0041] The core holding portion 20 is a part that houses the cylindrical filter core 7, which is arranged in a direction orthogonal to the aforementioned vertical direction in the axial direction (the direction in which the busbar 9 is inserted). That is, the core holding portion 20 is formed into a hollow cylindrical shape. The core holding portion 20 is formed such that one end in the aforementioned axial direction (the direction in which the busbar 9 is inserted) is a closed end, and the other end is an open end.

[0042] Furthermore, there are no particular limitations on the arrangement of the power terminals. However, for ease of explanation, the direction in which the closed end of the core holding portion 20 in the aforementioned axial direction is located is defined as forward, and the direction in which the open end of the core holding portion 20 in the aforementioned axial direction is located is defined as rearward.

[0043] That is, the core holding part 20 is formed such that the front side is a closed end and the rear side is an open end. With such a core holding part 20, the filter core 7 can be taken out from the rear side and inserted when the core cover 8 is removed.

[0044] The terminal block portion 30 is integrated with the core holding portion 20 and is located outside the core holding portion 20 in the radial direction (hereinafter referred to as radial) of the filter core 7. That is, the terminal block portion 30 is located radially outside the core holding portion 20. In this embodiment, the terminal block portion 30 is mainly located above the core holding portion 20.

[0045] Additionally, the terminal block portion 30 has a plurality of fastening nuts 31. These fastening nuts 31 are nuts for tightening the busbar 9 or conductive component 11 to the fastening bolts 13 of the terminal block portion 30, and are provided in such a way that they are exposed on the front surface of the terminal block portion 30. In this embodiment, these fastening nuts 31 are arranged such that the central opening (an opening with internal threads formed on the inner circumferential surface) faces forward (in the direction in which the busbar 9 is inserted into the filter core 7). That is, these fastening nuts 31 can be tightened with the fastening bolts 13 from the front.

[0046] In this embodiment, the terminal block portion 30 has four fastening nuts 31. Two of these four fastening nuts 31 are screwed into the fastening bolts 13 used to fasten the busbar 9. In the following description, the fastening nuts 31 that are screwed into the fastening bolts 13 used to fasten the busbar 9 will be referred to as busbar fastening nuts 32.

[0047] In addition, two of the four fastening nuts 31, excluding the busbar fastening nut 32, are screwed into the fastening bolts 13 used to fasten the conductive component 11. In the following description, the fastening nuts 31 used to fasten the fastening bolts 13 used to fasten the conductive component 11 are referred to as the conductive component fastening nuts 33.

[0048] The busbar fastening nut 32 is positioned above the filter core 7, above the conductive component fastening nut 33. Furthermore, the conductive component fastening nut 33 is positioned below the busbar fastening nut 32 on the side of the filter core 7.

[0049] In addition, a plurality of substrate fastening nuts 34 are provided on the upper surface of the terminal block portion 30. These substrate fastening nuts 34 are screwed into fastening bolts 14 for fastening the noise removal capacitor unit 10 to the terminal block portion 30. In this embodiment, three substrate fastening nuts 34 are provided.

[0050] Such a terminal block portion 30 is located radially outward of the filter core 7, and is configured to overlap with the filter core 7 in at least a portion when viewed from the radial outward side. In this embodiment, when viewed from the radial outward side, i.e., above, the terminal block portion 30 is sized such that the entire filter core 7 is hidden by the terminal block portion 30.

[0051] The fixing part 40 is located at the lower part of the resin housing 6, and is a flange-shaped part located below the terminal block part 30. The fixing part 40 is provided in such a way that it protrudes radially outward from the core holding part 20.

[0052] The mounting part 40 is fastened to the inverter housing 2 by bolts (not shown). Figure 5 As shown, the fixing part 40 is provided with a plurality of cylindrical collars 41 through which bolts (not shown) are inserted. These collars 41 are arranged to extend through in the vertical direction.

[0053] The filter core 7 is made of a magnetic material and is formed into a cylindrical shape. The filter core 7 is configured such that, when housed in the core holding part 20 of the terminal block part 30, the core overlaps with the core holding part 20.

[0054] The core cover 8 is formed in an annular shape to close the open end of the core holding part 20. The core cover 8 is fixed to the core holding part 20 and the filter core 7 to close the open end behind the core holding part 20.

[0055] Busbar 9 is connected to battery B and forms a plate-shaped transmission path for direct current flow. Two busbars 9 are provided. One busbar 9 is connected to the positive terminal of battery B. The other busbar 9 is connected to the negative terminal of battery B. These busbars 9 are arranged in parallel with a certain gap between them.

[0056] Such a busbar 9 is formed Figure 1 The conductive lines BU shown are part of the circuit. That is, these busbars 9 are DC power transmission conductors connecting the battery B and the power conversion circuit H.

[0057] like Figure 3 and Figure 4As shown, each busbar 9 has a horizontal portion 9a passing through the filter core 7 and a vertical portion 9b extending upward from the front end of the horizontal portion 9a. A bolt insertion hole 9b1 extending in the front-rear direction is provided at the upper end of the vertical portion 9b.

[0058] Each busbar 9 is configured such that, when viewed from the front, the bolt insertion hole 9b1 overlaps with the busbar using a fastening nut 32. Such busbars 9 are secured to the terminal block portion 30 (i.e., the resin housing 6) by fastening bolts 13 inserted into the bolt insertion hole 9b1.

[0059] like Figure 3 As shown, the vertical portion 9b is fastened to the terminal block portion 30 with the front surface of the power terminal 5 exposed in this embodiment. As described above, the terminal portion of the wiring harness (not shown) connected to the battery B is inserted into the interior of the inverter housing 2.

[0060] By arranging the terminal portion of such a wire harness from bottom to top parallel to the vertical portion 9b, and then fastening it to the vertical portion 9b exposed on the front surface of the power terminal 5, the battery B can be electrically connected to the busbar 9. The terminal portion of such a wire harness is fastened to the terminal block portion 30 together with the vertical portion 9b by fastening bolts 13.

[0061] In addition, each busbar 9 has a branch piece 9c protruding laterally from the vertical portion 9b. Each branch piece 9c is provided with a bolt insertion hole 9c1 that extends in the front-rear direction. Each busbar 9 is arranged such that the bolt insertion hole 9c1 overlaps with the conductive component using a fastening nut 33 when viewed from the front. Such busbars 9 are fastened to the terminal block portion 30 (i.e., the resin housing 6) by fastening bolts 13 inserted into the bolt insertion holes 9c1.

[0062] Additionally, to maintain the distance between the two busbars 9, a busbar cover can be installed between the busbars 9. The busbar cover is formed of an insulator, positions the busbars 9, and prevents the busbars 9 from short-circuiting with each other.

[0063] The noise removal capacitor unit 10 is electrically connected to the busbar 9. Specifically, the noise removal capacitor unit 10 is connected to the busbar 9 via a conductive member 11. The noise removal capacitor unit 10 has a circuit board 10a and a plurality of ceramic capacitors 10b mounted on the circuit board 10a.

[0064] The noise cancellation capacitor unit 10 is fastened to the terminal block 30 (i.e., the resin housing 6) by a fastening bolt 14 that engages with the base plate of the terminal block 30 using a fastening nut 34. This noise cancellation capacitor unit 10 is arranged such that it is mounted on the upper surface of the terminal block 30 and is located radially outward from the filter core 7.

[0065] Furthermore, viewed from the radially outer side, the noise removal capacitor unit 10 overlaps with the filter core 7 in such a way that at least a portion overlaps. In this embodiment, viewed from the radially outer side, the noise removal capacitor unit 10 is arranged such that the entire noise removal capacitor unit 10 overlaps with the filter core 7.

[0066] The conductive component 11 is a wiring component that connects the noise removal capacitor unit 10 and the busbar 9. In this embodiment, a conductive component 11 is provided for each busbar 9. That is, two conductive components 11 are provided. One end of one conductive component 11 is connected to the branch piece 9c of the busbar 9, which is connected to the positive terminal side of the battery B. One end of one conductive component 11 is fastened to the terminal block portion 30 together with the branch piece 9c by a fastening bolt 13.

[0067] Additionally, the other end of a conductive component 11 is connected to a noise removal capacitor unit 10. The other end of a conductive component 11 is fastened to the terminal block portion 30 together with the circuit board 10a by a fastening bolt 14.

[0068] One end of another conductive component 11 is connected to a branch piece 9c of a busbar 9 that is connected to the negative terminal side of the battery B. One end of the other conductive component 11 is fastened to the terminal block portion 30 together with the branch piece 9c by a fastening bolt 13.

[0069] Additionally, the other end of another conductive component 11 is connected to the noise removal capacitor unit 10. The other end of the other conductive component 11 is fastened to the terminal block portion 30 together with the circuit board 10a by a fastening bolt 14.

[0070] The frame grounding connection component 12 is a wiring component used to electrically connect the noise removal capacitor unit 10 to the frame ground. One end of the frame grounding connection component 12 is connected to, for example, the inverter housing 2 by a bolt (not shown). The other end of the frame grounding connection component 12 is fastened to the terminal block portion 30 together with the circuit board 10a by a fastening bolt 14.

[0071] like Figure 3 As shown, these conductive components 11 and frame grounding connection components 12 are arranged along the side of the terminal block portion 30. However, as Figure 6 As shown, the conductive component 11 can also be arranged along the front and upper surfaces of the terminal block portion 30.

[0072] In this case, one end of the conductive component 11 can also be fastened to the terminal block portion 30 together with the vertical portion 9b of the busbar 9 using the fastening bolt 13 that engages with the busbar using the fastening nut 32. Thus, as Figure 6As shown, the structure can be configured without the conductive component and the fastening nut 33. Furthermore, the number of fastening bolts 13 can be reduced from four to two. Moreover, the conductive component 11 can be shortened.

[0073] Figure 7 This is a schematic circuit diagram of power terminal 5. As shown in the diagram, in power terminal 5, a conductive component 11 is connected to busbar 9, which is connected to the positive terminal (P side) of battery B. Another conductive component 11 is connected to busbar 9, which is connected to the negative terminal (N side) of battery B. Ceramic capacitors 10b are connected to these conductive components 11. A frame grounding connection component 12 is connected to these ceramic capacitors 10b.

[0074] When assembling the power conversion device 1 of this embodiment, the terminal portion of the wiring harness connected to the battery B is fastened together with the busbar 9 to the terminal block portion 30 using fastening bolts 13. Thus, the battery B is electrically connected to the busbar 9. Furthermore, a noise removal capacitor unit 10 is connected to the busbar 9, thereby removing noise components from the current flowing through the busbar 9.

[0075] Furthermore, in this embodiment, the resin housing 6, filter core 7, core cover 8, busbar 9, noise removal capacitor unit 10, conductive component 11, and frame grounding connection component 12, excluding the busbar 9, constitute the filter unit 100. That is, the power terminal 5 of this embodiment includes the filter unit 100 and the busbar 9.

[0076] The filter unit 100 of this embodiment includes a filter core 7, a resin housing 6, and a noise removal capacitor unit 10. The filter core 7 is cylindrical and is inserted through a busbar 9. The resin housing 6 holds the filter core 7. The noise removal capacitor unit 10 is electrically connected to the busbar 9. In addition, the resin housing 6 has a terminal block portion 30 for connecting the busbar 9. The terminal block portion 30 is located radially outward of the filter core 7 and is arranged such that at least a portion overlaps with the filter core 7 when viewed from the radial outward side.

[0077] In this embodiment of the filter unit 100, the resin housing 6 holding the filter core 7 has a terminal block portion 30 for connecting the busbar 9. Therefore, the filter unit 100 of this embodiment does not require the terminal block portion 30 to be separately provided from the resin housing 6. Therefore, according to the filter unit 100 of this embodiment, in a power conversion device having a busbar 9 inserted into the cylindrical filter core 7, the terminal block for fixing the busbar 9 can be reduced.

[0078] According to this embodiment of the filter unit 100, the terminal block does not need to be separately provided from the resin housing 6. Therefore, a portion of the inverter housing 2 is not dedicated to the terminal block, which enables the power conversion device 1 to be miniaturized and lightweight. For example, compared to the case where the terminal block is separately provided from the resin housing 6, the filter unit 100 according to this embodiment can reduce the weight by about 5%.

[0079] Furthermore, when viewed from above (radially outward), the terminal block portion 30 disposed on the resin housing 6 is arranged to overlap with the filter core 7. Therefore, the area inside the inverter housing 2 that is exclusively occupied by only the filter core 7 and the terminal block portion 30 when viewed from above can be reduced, thereby reducing the size of the power conversion device 1 when viewed from above. For example, as in this embodiment, by arranging the filter core 7 and the terminal block portion 30 to overlap when viewed from above, the exclusive area of ​​the filter unit 100 can be reduced by approximately 20% compared to the case where the filter core 7 and the terminal block portion 30 do not overlap when viewed from above.

[0080] Furthermore, in the filter unit 100 of this embodiment, the filter core 7 can be housed in the resin housing 6. Therefore, for example, it is not necessary to house the filter core 7 in another cover and then glue the cover to the resin housing 6. Therefore, the filter unit 100 according to this embodiment simplifies the assembly process and reduces assembly costs.

[0081] Furthermore, in the filter unit 100 of this embodiment, the terminal block portion 30 has a busbar fastening nut 32 that can be screwed into the fastening bolt 13 that secures the busbar 9 to the terminal block portion 30. The busbar fastening nut 32 is arranged such that its central opening faces the insertion direction of the busbar 9 in the filter core 7.

[0082] According to the filter unit 100 of this embodiment, for example, Figure 3 As shown, the busbar 9 can extend in the vertical direction (radial) and be fastened to the terminal block portion 30 using the fastening bolt 13. Therefore, the terminal portion of the wiring harness connected to the battery B can also be arranged to extend in the vertical direction (radial) in the same way as the busbar 9. Therefore, the area of ​​the terminal portion of the wiring harness and the busbar 9 when viewed from above can be reduced, and the proprietary area of ​​the terminal portion of the wiring harness and the busbar 9 inside the inverter housing 2 when viewed from above can be reduced.

[0083] Furthermore, in the filter unit 100 of this embodiment, the noise removal capacitor unit 10 is located radially outside the filter core 7 and is arranged to overlap with the filter core 7 in at least a portion when viewed from the radially outside.

[0084] According to the filter unit 100 of this embodiment, the area inside the inverter housing 2 dedicated only to the noise removal capacitor unit 10 can be reduced when viewed from above, thereby reducing the size of the power conversion device 1 when viewed from above.

[0085] Furthermore, the filter unit 100 in this embodiment includes a conductive member 11 that connects the noise removal capacitor unit 10 and the busbar 9. Additionally, the conductive member 11 is separate from the resin housing 6.

[0086] According to the filter unit 100 of this embodiment, it is not necessary to mold the conductive component 11 in the resin housing 6. Therefore, the resin housing 6 can be formed without being affected by the conductive component 11.

[0087] In addition, such as Figure 6 As shown, the filter unit 100 of this embodiment can also be structured such that the conductive member 11 and the busbar 9 are fastened together to the resin housing 6. According to this embodiment, the filter unit 100, as described above, can be configured without the fastening nut 33 for the conductive member. Furthermore, the number of fastening bolts 13 can be reduced from four to two. Moreover, the conductive member 11 can be shortened. Therefore, the number of components in the filter unit 100 can be reduced, or the amount of forming material can be reduced.

[0088] In addition, in the filter unit 100 of this embodiment, the noise removal capacitor unit 10 has a circuit board 10a and a ceramic capacitor 10b mounted on the circuit board 10a.

[0089] According to the filter unit 100 of this embodiment, the noise removal capacitor unit 10 can be fixed to the resin housing 6. Therefore, for example, the connection process of the capacitor unit is simplified compared to the case where a film capacitor is connected using a wire harness. Furthermore, by using a general-purpose ceramic capacitor 10b, costs can be reduced compared to the case where a dedicated film capacitor is used.

[0090] Furthermore, the power conversion device 1 of this embodiment includes a power terminal 5 connected to the battery B, which converts the power passing through the power terminal 5. The power terminal 5 also includes a filter unit 100 for suppressing electromagnetic noise.

[0091] According to the power conversion device 1 of this embodiment, similarly to the filter unit 100 of this embodiment, the terminal block portion 30 does not need to be separately provided from the resin housing 6, and the terminal block for fixing the busbar 9 can be reduced.

[0092] Preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. The shapes, combinations, etc. of the constituent components shown in the above embodiments are examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0093] For example, in the above embodiment, a structure in which the entire filter core 7 is hidden by the terminal block portion 30 when viewed radially has been described. However, the present invention is not limited to this, and a structure in which a portion of the filter core 7 protrudes from the terminal block portion 30 when viewed radially may also be used.

[0094] Furthermore, in the above embodiment, a structure in which the noise removal capacitor unit 10 overlaps entirely with the terminal block portion 30 when viewed radially has been described. However, the present invention is not limited to this, and a structure in which the noise removal capacitor unit 10 does not overlap with the terminal block portion 30 when viewed radially may also be adopted.

[0095] Furthermore, in the above embodiment, a separate structure of the conductive component 11 and the resin housing 6 has been described. However, the present invention is not limited thereto, and the conductive component 11 may also be molded into the resin housing 6. In such a case, by placing the conductive component 11 inside the mold and insert molding the resin housing 6, the conductive component 11 can be molded into the resin housing 6.

[0096] Furthermore, in the above embodiment, the structure in which the busbar 9 is connected to the terminal block portion 30 has been described. However, it is also possible to connect the terminals of the power module 3a to the terminal block portion 30. Additionally, in the above embodiment, the structure in which the busbar 9 is connected to the terminal block portion 30 from the battery B side has been described. However, the present invention is not limited to this, and a structure in which the busbar 9 is connected from the power module 3a side may also be used.

[0097] Furthermore, the above-described embodiments can also be described, for example, as in the following notes.

[0098] (Note 1)

[0099] A filter unit is characterized by comprising: a cylindrical filter core through which a busbar is inserted; a resin housing holding the filter core; and a noise removal capacitor unit electrically connected to the busbar, the resin housing having a terminal block portion for connection to the busbar, the terminal block portion being located radially outward of the filter core and configured to at least partially overlap the filter core when viewed from the radially outward side.

[0100] (Note 2)

[0101] According to the filter unit described in Appendix 1, the terminal block portion has a fastening nut that can be screwed into a fastening bolt that fastens the busbar to the terminal block portion, the fastening nut being configured such that its central opening faces the insertion direction of the busbar in the filter core.

[0102] (Note 3)

[0103] According to Appendix 1 or 2, the filter unit is characterized in that the noise removal capacitor unit is located on the radially outer side of the filter core and is configured to overlap with the filter core in at least a portion when viewed from the radially outer side.

[0104] (Note 4)

[0105] The filter unit according to any one of Appendices 1 to 3 is characterized in that it has a conductive component that connects the noise removal capacitor unit to the busbar, the conductive component being separate from the resin housing.

[0106] (Note 5)

[0107] According to Appendix 4, the filter unit is characterized in that the conductive component is fastened together with the busbar to the resin housing.

[0108] (Note 6)

[0109] The filter unit according to any one of Appendices 1 to 5 is characterized in that the noise removal capacitor unit comprises: a circuit board; and a ceramic capacitor mounted on the circuit board.

[0110] (Note 7)

[0111] A power conversion device includes a power terminal connected to a storage battery, which converts the power passing through the power terminal, characterized in that the power terminal includes a filter unit for suppressing electromagnetic noise as described in any one of Appendices 1 to 6.

[0112] Explanation of reference numerals in the attached figures

[0113] 1: Power conversion device

[0114] 5: Power terminals

[0115] 6: Resin outer shell

[0116] 7: Filter core

[0117] 8: Core Cover

[0118] 9: Busbar

[0119] 9a: Horizontal section

[0120] 9b: Vertical part

[0121] 9b1: Bolt insertion hole

[0122] 9c: Branch chip

[0123] 9c1: Bolt insertion hole

[0124] 10: Capacitor unit for noise removal

[0125] 10a: Circuit board

[0126] 10b: Ceramic capacitor

[0127] 11: Conductive components

[0128] 12: Frame grounding connection component

[0129] 13: Fastening bolts

[0130] 14: Fastening bolts

[0131] 20: Core holding section

[0132] 30: Terminal block section

[0133] 31: Fastening nut

[0134] 32: Busbar fastening nut (fastening nut)

[0135] 33: Fastening nuts for conductive components (fastening nuts)

[0136] 34: Fastening nut

[0137] 40: Fixing part

[0138] 41: Ring

[0139] 100: Filter unit

[0140] B: Storage battery

Claims

1. A filter unit, characterized in that, have: A cylindrical filter core for busbar insertion; A resin housing that holds the filter core; A capacitor unit for noise removal is electrically connected to the busbar. The resin housing has a terminal block portion for connecting the busbar. The terminal block portion is located radially outside the filter core and is configured to overlap with the filter core in at least a portion when viewed from the radially outside.

2. The filter unit according to claim 1, characterized in that, The terminal block portion has a fastening nut that can be screwed into a fastening bolt that secures the busbar to the terminal block portion. The fastening nut is configured with its central opening facing the insertion direction of the busbar of the filter core.

3. The filter unit according to claim 1 or 2, characterized in that, The noise removal capacitor unit is located on the radially outer side of the filter core and is configured to overlap with the filter core in a manner viewed from the radially outer side.

4. The filter unit according to claim 1 or 2, characterized in that, It has a conductive component that connects the noise removal capacitor unit to the busbar. The conductive component is separate from the resin shell.

5. The filter unit according to claim 4, characterized in that, The conductive component is fastened to the resin housing together with the busbar.

6. The filter unit according to claim 1 or 2, characterized in that, The noise removal capacitor unit includes: a circuit board; and a ceramic capacitor mounted on the circuit board.

7. A power conversion device comprising a power terminal connected to a storage battery, for converting power passing through the power terminal, characterized in that, The power supply terminal has a filter unit as described in claim 1 or 2 for suppressing electromagnetic noise.

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