Inverter device

Abstract

To provide a technology for compactly mounting a current sensor and a ferrite.SOLUTION: An inverter device comprises a housing, an inverter circuit housed in the housing, a bus bar extending from the inverter circuit through an opening formed in the housing to a motor terminal block located outside the housing, and a support base fixed to the periphery of the opening and supporting the bus bar. Both a current sensor for measuring the current flowing through the bus bar and a ferrite for reducing noise in the current flowing through the bus bar are fixed to the support base.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present specification relates to an inverter device. [Background technology]

[0002] Patent Document 1 discloses a current sensor integrated into a bus bar extending from a circuit board of an inverter. Patent Document 2 discloses ferrite surrounding the outer periphery of a conductive member extending from an inverter. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-098336 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-233293 Summary of the Invention [Problem to be solved by the invention]

[0004] This specification provides a technique for compactly mounting a current sensor and a ferrite. [Means for solving the problem]

[0005] The inverter device disclosed in this specification comprises a housing, an inverter circuit housed within the housing, a bus bar extending from the inverter circuit through an opening formed in the housing to a motor terminal block located outside the housing, and a support base fixed to the periphery of the opening and supporting the bus bar, and both a current sensor that measures the current flowing through the bus bar and a ferrite that reduces noise in the current flowing through the bus bar are fixed to the support base.

[0006] According to the above configuration, the current sensor and the ferrite can be concentrated near the opening of the housing, which allows the current sensor and the ferrite to be mounted compactly.

[0007] Details and further improvements of the technology disclosed in this specification are described in the following "Description of Embodiments of the Invention." [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of an inverter device. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a region II in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The inverter device 2 is mounted on a vehicle. The inverter device 2 converts DC power from an on-board battery (not shown) into AC power and supplies it to a motor 42 for driving. The inverter device 2 may also convert AC power generated by the motor 42 when braking the vehicle into DC power and supply it to the on-board battery. The inverter device 2 is disposed on one surface (for example, the top surface) of a motor housing 40 that houses the motor 42.

[0010] The inverter device 2 includes an inverter housing 10, an inverter circuit 12, a bus bar 14, a support base 16, a control board 18, a cooler 20, a capacitor 22, and a filter 24. The components 12, 14, 16, 18, 20, 22, and 24 are housed within the inverter housing 10.

[0011] The inverter circuit 12 is composed of a power module. A control board 18 is connected to the inverter circuit 12 via multiple signal lines (not shown) and controls the inverter circuit 12. A capacitor 22 and a filter 24 are connected to a DC side terminal 12a of the inverter circuit 12. A cooler 20 cools the inverter circuit 12, the capacitor 22, and the filter 24.

[0012] One end of a three-phase bus bar 14 is connected to terminal 12b on the AC side of inverter circuit 12. Bus bar 14 extends from inverter circuit 12 to the outside of inverter housing 10 through opening 10a formed in inverter housing 10. The other end of bus bar 14 is located inside motor housing 40. A motor terminal block 44 is provided inside motor housing 40, and the other end of bus bar 14 is fastened to motor terminal block 44. One end of a three-phase bus bar 46 extending from motor 42 is located on motor terminal block 44. That is, one end of bus bar 46 extending from motor 42 is connected to the other end of bus bar 14 extending from inverter circuit 12 at motor terminal block 44. This electrically connects motor 42 and inverter circuit 12.

[0013] A support base 16 is fixed to the periphery of the opening 10a of the inverter housing 10. The support base 16 is made of, for example, resin. The support base 16 supports the bus bar 14 that passes through the opening 10a. As shown in FIG. 2, the bus bar 14 passes inside the support base 16. A current sensor 30 and a ferrite 32 are both fixed to the inside of the bus bar 14. For example, the current sensor 30 and the ferrite 32 are integrated with resin on the support base 16. The current sensor 30 is a magnetic field detection sensor and includes a core that surrounds the bus bar 14. The current sensor 30 measures the current flowing through the bus bar 14. The current sensor 30 is connected to the control board 18. The ferrite 32 is a ring-shaped magnetic material that surrounds the bus bar 14 and reduces noise in the current flowing through the bus bar 14. The current sensor 30 and the ferrite 32 are aligned along the extension direction of the bus bar 14.

[0014] The support base 16 is fixed to the inside of the inverter housing 10 via a face seal 34. The face seal 34 seals the space inside the inverter housing 10 from the space outside the inverter housing 10 (i.e., the space inside the motor housing 40).

[0015] According to the configuration of this embodiment, the current sensor 30 and the ferrite 32 can be concentrated near the opening 10a of the inverter housing 10. This allows the current sensor 30 and the ferrite 32 to be mounted compactly. For example, a comparative example can be considered in which the current sensor 30 is mounted in the inverter circuit 12. However, various factors can cause the inverter circuit 12 to become larger. For example, one factor is the standardization of the inverter circuit 12 across a variety of vehicle models. When the inverter circuit 12 becomes larger, it becomes difficult to secure space to mount the current sensor 30 on the inverter circuit 12. In this embodiment, space can be secured to mount the current sensor 30, which would not have been possible to mount on the inverter circuit 12 due to the larger inverter circuit 12.

[0016] (Correspondence) The inverter device 2 is an example of an "inverter device." The inverter housing 10 and the opening 10a are examples of a "housing" and an "opening," respectively. The inverter circuit 12, the bus bar 14, and the support base 16 are examples of an "inverter circuit," a "bus bar," and a "support base," respectively. The current sensor 30 and the ferrite 32 are examples of a "current sensor" and a "ferrite," respectively. The motor terminal block 44 is an example of a "motor terminal block." [Explanation of symbols]

[0017] 2: Inverter device 10: Housing 10a: opening 12: Inverter circuit 12a: Terminal 12b: Terminal 14: Bus bar 16: Support stand 18: Control board 20:Cooler 22: Capacitor 24: Filter 30: Current sensor 32: Ferrite 34: Face seal 40: Housing 42: Motor 44: Motor terminal block 46: Bus bar

Claims

[Claim 1] The housing and an inverter circuit housed in the housing; a bus bar extending from the inverter circuit through an opening formed in the housing to a motor terminal block located outside the housing; a support base fixed to a periphery of the opening and supporting the bus bar; Equipped with a current sensor for measuring a current flowing through the bus bar and a ferrite for reducing noise of the current flowing through the bus bar are both fixed to the support base; Inverter device.

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