Noise removal filter

Abstract

To provide a noise removal filter capable of using a component in common even in a different filter configuration.SOLUTION: A noise removal filter 30 that removes noise propagating through two bus bars 80 to which an output of a power control device 54 is supplied comprises: annular ferrite cores (=inductance) 32a, 32b to which the two bus bars 80 are inserted and attached; and a capacitor unit 34 having a first capacitor 90 and a second capacitor 92, one terminal of which is electrically connected to a surface of the two bus bars 80 and the other terminal of which is electrically connected to a case 18 having a reference potential. Regarding the ferrite cores 32a, 32b and the capacitor unit 34, each of mounting positions with respect to the two bus bars 80 is variable.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a noise removal filter that removes noise propagated from a power control device.

Background Art

[0002] A noise removal filter that removes noise propagated from a power control device is known. For example, the one described in Patent Document 1 is such a filter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the noise removal filter described in Patent Document 1, the connection relationship of the inductance and the capacitor has a filter configuration determined in advance. That is, it is difficult to change to different filter configurations according to the noise generated by the power control device, so-called EMC (electromagnetic compatibility) noise. Therefore, it is necessary to prepare separate constituent members for each different filter configuration.

[0005] The present invention has been made against the background of the above circumstances, and an object thereof is to provide a noise removal filter capable of sharing constituent members even with different filter configurations.

Means for Solving the Problems

[0006] The gist of the present invention is a noise removal filter for removing noise propagating through a plurality of busbars to which the output of a power control device is supplied, the noise removal filter including an annular inductor through which the plurality of busbars are inserted and attached, and a capacitor unit having a capacitor in which one terminal is electrically connected to the surface of the plurality of busbars respectively and the other terminal is electrically connected to a reference potential, wherein the inductor and the capacitor unit are each variable in the attachment position with respect to the plurality of busbars.

Advantages of the Invention

[0007] According to the noise removal filter of the present invention, there are provided an annular inductor through which the plurality of busbars are inserted and attached, and a capacitor unit having a capacitor in which one terminal is electrically connected to the surface of the plurality of busbars respectively and the other terminal is electrically connected to a reference potential, and the inductor and the capacitor unit are each variable in the attachment position with respect to the plurality of busbars. With such a configuration, it is possible to easily change the attachment positions of the annular inductor and the capacitor unit with respect to the plurality of busbars. Changing the attachment positions of the annular inductor and the capacitor unit results in a change in the filter configuration. Thus, it is possible to provide a noise removal filter in which different filter configurations can share components.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments, the drawings are appropriately simplified or deformed, and the dimensional ratios, shapes, etc. of each part are not necessarily drawn accurately.

Embodiment

[0010] FIG. 1 is a diagram for explaining an example of the electrical configuration of an electric power control device 54 and the like in a vehicle 10 on which a noise removal filter 30 (hereinafter simply referred to as "filter 30") according to an embodiment is mounted.

[0011] Vehicle 10 is an electric vehicle including an electric motor MG that functions as a power source. The electric motor MG is, for example, a rotating electrical machine having an electric motor function and a generator function, and is a so-called motor generator. The electric motor MG is, for example, a three-phase synchronous motor. The electric motor MG is connected to a pair of drive wheels (not shown) so as to be able to transmit power.

[0012] Vehicle 10 includes a high-voltage battery 46, an auxiliary battery 48, and an electric power control device 54.

[0013] The high-voltage battery 46 is a rechargeable secondary battery such as a nickel-metal hydride secondary battery or a lithium-ion battery, for example. The high-voltage battery 46 is connected to the electric power control device 54 via a first power line PL1. Since the first power line PL1 is a power line through which a direct current flows, there are two of them. The high-voltage battery 46 is a battery for driving the electric motor MG. For example, the stored power is supplied from the high-voltage battery 46 to the electric motor MG via the electric power control device 54. The electric motor MG generates electricity by the driven force input from a pair of drive wheels, and the generated electric power is charged into the high-voltage battery 46 via the electric power control device 54.

[0014] The auxiliary battery 48 is a rechargeable secondary battery such as a lead-acid battery. The auxiliary battery 48 has a charging voltage lower than that of the high-voltage battery 46. The auxiliary battery 48 is connected to the power control device 54 via the second power line PL2, a DCDC converter 56 described later, and the first power line PL1. Since the second power line PL2 is a power line through which a direct current flows, there are two of them. The auxiliary battery 48 is charged by the generated power of an alternator (not shown) or the power supplied from the high-voltage battery 46 via the first power line PL1, the DCDC converter 56, and the second power line PL2.

[0015] The power control device 54 drives and controls the electric motor MG. The power control device 54 includes a DCDC converter 56, a boost converter 60, an inverter 62, and an electric motor control device 58. The power control device 54 is a power control device that controls the power exchanged between the high-voltage battery 46 and the electric motor MG, that is, the power exchanged by the electric motor MG.

[0016] The DCDC converter 56 is provided between the first power line PL1 and the second power line PL2. The DCDC converter 56 functions as a charging device that steps down the voltage of the high-voltage battery 46 to a voltage equivalent to that of the auxiliary battery 48 to charge the auxiliary battery 48. The auxiliary battery 48 supplies the power for operating the auxiliary equipment provided in the vehicle 10. The auxiliary battery 48 supplies the power for operating, for example, auxiliary equipment and the electric motor control device 58.

[0017] The boost converter 60 includes a reactor, a switching element, etc. (not shown). The boost converter 60 is a buck-boost circuit having a function of boosting the voltage of the high-voltage battery 46 and supplying it to the inverter 62, and a function of stepping down the voltage converted to direct current by the inverter 62 and supplying it to the high-voltage battery 46.

[0018] The inverter 62 includes an MG power module 64 and the like. The MG power module 64 includes a switching element (not shown) and the like. The MG power module 64 is connected to the electric motor MG via a third power line PL3. The third power line PL3 is a power line through which three-phase AC current of, for example, U-phase, V-phase, and W-phase flows, and thus there are three of them. The inverter 62 converts the DC current output from the boost converter 60 into an AC current for driving the electric motor MG. The inverter 62 converts the AC current generated by the electric motor MG into a DC current.

[0019] The electronic control device 50 transmits and receives signals between the DCDC converter 56 and the motor control device 58 via, for example, a known CAN (Controller Area Network) communication line. The electronic control device 50 controls the running state of the vehicle 10 by controlling the drive of the motor MG based on, for example, a signal from a sensor (not shown). The electronic control device 50 reduces the voltage of the high-voltage battery 46 to a voltage equivalent to that of the auxiliary battery 48 by, for example, controlling the DCDC converter 56. In this embodiment, the electronic control device 50 is a control device separate from the power control device 54, particularly the motor control device 58.

[0020] The motor control device 58 controls the motor MG based on an output required value from the electronic control device 50. For example, the motor control device 58 controls the boost converter 60 and the inverter 62 to control the output of the motor MG.

[0021] The non-rotating case 18, which is a non-rotating member attached to the vehicle body, is made of, for example, a casting of an aluminum alloy. The case 18 is set as the reference potential of the electrical configuration such as the power control device 54 in the vehicle 10. The "reference potential" is the potential that serves as the reference for a circuit including an electronic circuit. Specifically, it is the reference (0 [V]) of the potentials of the power control device 54, the high-voltage battery 46, the auxiliary battery 48, the electric motor MG, and the electronic control device 50, etc. The case 18 is, for example, a structure in which a plurality of members are integrally connected by fasteners such as bolts 74, 76, 78, etc. The inside of the case 18 is separated vertically by a partition wall 18c. The case 18 has an upper space U and a lower space L separated vertically by the partition wall 18c. The side wall of the case 18 that partitions the upper space U is the side wall 18a, and the side wall of the case 18 that partitions the lower space L is the side wall 18b. The partition wall 18c is a partition wall provided in common on the lower side that partitions the upper space U and the upper side that partitions the lower space L. Therefore, when the upper space U and the lower space L are separated in the case 18, at least one of the upper space U and the lower space L will necessarily be in a state of being exposed to the outside. The "same case" means a case where at least one of them is exposed to the outside when the upper space U and the lower space L are separated in this way.

[0022] In the mounted state in the vehicle 10, the power control device 54 is housed in the upper space U, and the transaxle 72 including the electric motor MG is housed in the lower space L. In this way, the transaxle 72 and the power control device 54 are housed in the same case 18.

[0023] The filter 30 is attached to, for example, a bus bar 80 that is a part of the first power line PL1. The bus bar 80 is a connection line provided, for example, on a terminal block for connecting the inside and outside (specifically, the inside and outside of the upper space U) of the case 18 in the first power line PL1.

[0024] In the power control device 54, for example, when the switching elements included in the boost converter 60 and the inverter 62 are switched at high speed, noise of high-frequency components is generated. This noise tends to propagate to the high-voltage battery 46 via the bus bar 80 of the first power line PL1, for example, as common-mode noise.

[0025] FIG. 2 is an explanatory view of the bus bar 80. (a) is an explanatory view of the manufacturing method of the bus bar 80, and (b) is a perspective view of the two bus bars 80 in the mounted state on the vehicle 10. Each bus bar 80 has conductivity and is made of, for example, metal. The two bus bars 80 correspond to the "plurality of bus bars" in the present invention.

[0026] The manufacturing method of the bus bar 80 will be described with reference to FIG. 2(a). First, plate-like bodies 82x and 88x shown in FIG. 2(a), which are formed by, for example, punching or cutting in press working, are prepared respectively. FIG. 2(a) is a view of the plate-like bodies 82x and 88x seen in the plate thickness direction. Next, the plate-like body 82x is bent by 90° so that the broken line DL1 is on the inside. The broken line DL1 is the same as the longitudinal direction of the straight portion 84 described later. In a cross-sectional view perpendicular to the broken line DL1, the portion where the plate-like body 82x is bent is L-shaped. Also, the plate-like body 88x is bent by 90° so that the broken line DL2 is on the outside. The broken line DL2 is the same as the longitudinal direction of the straight portion 84 described later. In a cross-sectional view perpendicular to the broken line DL2, the portion where the plate-like body 88x is bent is L-shaped. The bus bar 80 is configured by combining the plate-like bodies 82x and 88x bent in this way.

[0027] As shown in FIG. 2(b), the two busbars 80 are symmetric with respect to each other about, for example, a straight line C when mounted on the vehicle 10. There is a gap between the two busbars 80, and the two busbars 80 are insulated from each other. The two busbars 80 each have, as separate members, a main member 82 including a straight portion 84 extending linearly, and a connecting member 88 connected to one end portion 84t1 in the longitudinal direction of the straight portion 84 and extending in a direction different from the longitudinal direction of the straight portion 84.

[0028] One end portion 84t1 of the straight portion 84 is also one end portion 82t1 in the longitudinal direction of the main member 82. The other end portion 82t2 on the side opposite to the one end portion 82t1 in the longitudinal direction of the main member 82 is a bent portion 86. The bent portion 86 is a portion extending further outward from the other end portion 84t2 on the side opposite to the one end portion 84t1 in the longitudinal direction of the straight portion 84. "Outward" means a direction away from the straight portion 84 in the longitudinal direction of the straight portion 84. The bent portion 86 includes a portion extending in a direction different from the longitudinal direction of the straight portion 84. Specifically, the bent portion 86 extends outward from the other end portion 84t2 of the straight portion 84, bends 90° with respect to the longitudinal direction of the straight portion 84 without changing the plate thickness direction, then bends with the plate thickness direction changed by 90° so as to be separated from the other busbar 80, and further, its tip portion bends outward in the same direction as the longitudinal direction of the straight portion 84 without changing the plate thickness direction. Note that the straight portion 84 corresponds to the "extension portion" in the present invention. The one end portion 84t1 corresponds to the "one end portion" in the present invention, and the other end portion 84t2 corresponds to the "other end portion" in the present invention.

[0029] The straight portion 84 is a plate-shaped member extending linearly. A hole 82h1 is provided at one end portion 84t1 of the straight portion 84. The hole 82h1 is a hole for connecting to the connecting member 88 by a bolt (not shown). A hole 82h2 is provided at the other end portion 82t2 of the main member 82.

[0030] The connecting member 88 has a shape in which a plate-like body is bent by 90° with respect to its longitudinal direction. A hole 88h1 is provided at one end portion 88t1 of the connecting member 88, and a hole 88h2 is provided at the other end portion 88t2 of the connecting member 88. The hole 88h1 of the connecting member 88 is a hole for connecting to the main member 82 by a bolt (not shown). The main member 82 and the connecting member 88 are connected by a bolt (not shown) that passes through the hole 82h1 provided at one end portion 82t1 of the main member 82 and the hole 88h1 provided at one end portion 88t1 of the connecting member 88. The hole 82h2 provided at the other end portion 82t2 of the main member 82 and the hole 88h2 provided at the other end portion 88t2 of the connecting member 88 are holes for connecting the bus bar 80 to either one of the first power line PL1 inside the case 18 and the first power line PL1 outside the case 18 in the terminal block by a bolt (not shown).

[0031] Figure 3 is a perspective view for explaining the configuration of the capacitor unit 34. In Figure 3, the first capacitor 90 and the second capacitor 92, which will be described later, are not shown.

[0032] The capacitor unit 34 includes a substrate portion 36 and a leaf spring 38.

[0033] On the surface of the substrate portion 36, two sets of paired first conduction portions 36a and second conduction portions 36b are provided. Through holes 36h1 are respectively provided in the first conduction portions 36a, and through holes 36h2 are respectively provided in the second conduction portions 36b. The first capacitors 90 (see FIG. 4) are respectively mounted between the two sets of first conduction portions 36a and second conduction portions 36b, for example, by soldering. The second capacitors 92 (see FIG. 4) are respectively mounted between the two sets of first conduction portions 36a and second conduction portions 36b through the through holes 36h1 and 36h2, for example, by soldering. Preferably, the first capacitors 90 and the second capacitors 92 are capacitors having different electrical characteristics. For example, the first capacitors 90 have frequency characteristics in which high-frequency noise is less likely to propagate compared to the second capacitors 92, and the second capacitors 92 have a larger capacitance compared to the first capacitors 90. Note that the first capacitors 90 and the second capacitors 92 respectively correspond to the "capacitors" in the present invention.

[0034] The substrate portion 36 has two mounting portions 36f that conduct to the respective second conduction portions 36b. Fastening holes are provided in the respective mounting portions 36f. The substrate portion 36 is fastened to the case 18 by bolts 40 (see FIG. 4) at the mounting portions 36f. Specifically, the capacitor unit 34 is fastened to the case 18 by bolts 40 inserted through the fastening holes provided in the mounting portions 36f. A part of the fastened bolts 40 is in electrical contact with the second conduction portions 36b. That is, the second conduction portions 36b are electrically connected to the case 18 via the bolts 40.

[0035] The capacitor unit 34 includes two leaf springs 38. One end portion 38t1 of each leaf spring 38 is attached to the substrate portion 36 and electrically connected to the first conduction portion 36a, and the other end portion 38t2 is structured to be respectively contactable with the surface of the straight portion 84 of the bus bar 80. Each leaf spring 38 has conductivity and is made of, for example, metal. The other end portion 38t2 of the leaf spring 38 has a spring structure that presses the surface of the straight portion 84 of the bus bar 80 by an urging force. When the filter 30 is attached to the two bus bars 80, the two leaf springs 38 are structured to be able to hold the bus bars 80 that are conductively connected on the surface respectively.

[0036] Figure 4 is a perspective view of the filter 30 attached to the two bus bars 80. The filter 30 is a noise removal filter that removes noise propagating through the bus bar 80. The filter 30 includes a ferrite core 32a, a ferrite core 32b, and a capacitor unit 34.

[0037] Both ferrite cores 32a and 32b are non-separable annular ferrite cores that are attached by inserting the two bus bars 80 therethrough. The surfaces of both ferrite cores 32a and 32b are covered with an insulating material. In a ferrite core, "separable type" means a structure in which an annular ferrite core can be detachably divided or combined with a bus bar, and "non-separable type" means an integral structure in which the annular ferrite core cannot be divided. Note that the ferrite cores 32a and 32b respectively correspond to the "inductance" in the present invention.

[0038] The attachment of the filter 30 to the two busbars 80 is performed, for example, according to the following procedure. First, for one of the two busbars 80, after one end 82t1 of its main member 82 is inserted through the ferrite cores 32a and 32b in this order, the connecting member 88 is connected to the one end 82t1 of the main member 82. For the other of the two busbars 80, after one end 82t1 of its main member 82 is inserted through the ferrite cores 32b and 32a in this order, the connecting member 88 is connected to the one end 82t1 of the main member 82. Next, in the longitudinal direction of the straight portion 84 of the two busbars 80, the capacitor unit 34 is attached to the busbar 80 between the ferrite core 32a and the ferrite core 32b. The capacitor unit 34 is attached such that the other ends 38t2 of its two leaf springs 38 are electrically connected to the surfaces of the two busbars 80 respectively. Next, the substrate portion 36 of the capacitor unit 34 is fastened to the case 18 by bolts 40.

[0039] Preferably, in a cross-section perpendicular to the longitudinal direction of the straight portion 84, the polygon formed by the outer edge portions of the entire two busbars 80 is inscribed in the inner circumferences of the ferrite cores 32a and 32b. Thereby, the amount of the gap between the ferrite cores 32a and 32b and the two busbars 80 is suppressed.

[0040] The attachment positions of the ferrite cores 32a and 32b and the capacitor unit 34 with respect to the two busbars 80 are each variable. "The attachment position is variable" means that it is possible to change the connection relationship of the ferrite core 32a, the ferrite core 32b, and the capacitor unit 34 and attach them to the two busbars 80.

[0041] FIG. 5 is a diagram for explaining the filter configuration of the filter 30 shown in FIG. 4.

[0042] The ferrite cores 32a and 32b function as an inductance, i.e., the same function as when coils are inserted into each of the two busbars 80. Between the two busbars 80 and the case 18 which is the reference potential, a first capacitor 90 and a second capacitor 92 mounted on the capacitor unit 34 are connected in parallel. When the sum of the capacitance C1 [μF] of the first capacitor 90 and the capacitance C2 [μF] of the second capacitor 92 is defined as the total capacitance Ctotal [μF], the filter 30 has the filter configuration shown in FIG. 5.

[0043] FIG. 6 is a modified example of the filter configuration of the filter 30 shown in FIG. 4.

[0044] (Modification Example 1) When components other than the ferrite core 32b of the filter 30 are attached to the busbar 80, the filter configuration shown in FIG. 6(a) is obtained.

[0045] (Modification Example 2) When components other than the ferrite core 32a of the filter 30 are attached to the busbar 80, the filter configuration shown in FIG. 6(b) is obtained.

[0046] (Modification Example 3) When two capacitor units 34 are attached to the busbar 80 and one ferrite core 32a is attached by inserting the straight portion 84 of the two busbars 80 between the two capacitor units 34, the filter configuration shown in FIG. 6(c) is obtained.

[0047] According to this embodiment, an annular ferrite core 32a, 32b through which two bus bars 80 are inserted and attached, and a capacitor unit 34 having two first capacitors 90 and a second capacitor 92, one terminal of which is electrically connected to the surfaces of the two bus bars 80 respectively and the other terminal of which is electrically connected to the case 18, are provided. The attachment positions of the ferrite cores 32a, 32b and the capacitor unit 34 with respect to the bus bar 80 are variable respectively. In this way, it is possible to easily change the attachment positions of the annular ferrite cores 32a, 32b and the capacitor unit 34 to the two bus bars 80. Changing the attachment positions of the annular ferrite cores 32a, 32b and the capacitor unit 34 results in a change in the filter configuration. In this way, a filter 30 can be provided in which different filter configurations can share components (specifically, the annular ferrite cores 32a, 32b and the capacitor unit 34).

[0048] According to this embodiment, each of the two bus bars 80 has a main member 82 including a straight portion 84 extending linearly, and a connecting member 88 connected to one end portion 84t1 of the straight portion 84. With such a structure, it is possible to insert the two bus bars 80 into the non-split type annular ferrite cores 32a, 32b from the one end portion 84t1 side of the straight portion 84. When the ferrite cores 32a, 32b are non-split type, compared with the split type, a filter configuration with a simple structure, low cost, and stable impedance characteristics can be obtained.

[0049] According to this embodiment, (a) each of the two bus bars 80 has a bent portion 86, and (b) the bent portion 86 extends further outward from the other end portion 84t2 of the straight portion 84 and includes a portion extending in a direction different from the longitudinal direction of the straight portion 84. By having the bent portion 86, the degree of freedom in the shape design at the other end portion 82t2 of the main member 82 in the bus bar 80 is improved compared with the case where the bent portion 86 is not provided. Thereby, while enabling the two bus bars 80 to be inserted into the ferrite cores 32a, 32b, it is possible to ensure the insulation distance between the two bus bars 80.

[0050] According to this embodiment, the two bus bars 80 are respectively held by two conductive leaf springs 38 provided in the capacitor unit 34, and the surfaces of the two bus bars 80 are respectively electrically connected to one terminal of both the first capacitor 90 and the second capacitor 92 via the leaf springs 38. Since the leaf springs 38 hold the bus bars 80, relative movement between the leaf springs 38 and the bus bars 80 is suppressed. Thereby, the conductivity between the leaf springs 38 and the bus bars 80 is stabilized, and the noise removal characteristics of the filter 30 are stabilized.

[0051] According to this embodiment, (a) the capacitor unit 34 has a first conduction part 36a that conducts to the two bus bars 80 respectively and a second conduction part 36b that conducts to the case 18, and (b) the first capacitor 90 and the second capacitor 92 are both mounted between the first conduction part 36a and the second conduction part 36b respectively. By changing the electrical characteristics (specifically, capacitance and frequency characteristics) of the capacitors mounted on the capacitor unit 34, it becomes possible to variously change the characteristics of the filter 30.

[0052] According to this embodiment, (a) the capacitor unit 34 has a mounting part 36f that conducts to the second conduction part 36b, and (b) the mounting part 36f is mounted on the case 18 that is the reference potential and houses the power control device 54 with bolts 40. Thus, the bolts 40 have both the function of physically fixing the capacitor unit 34 to the case 18 and the function of electrically connecting the second conduction part 36b to the case 18. Thereby, an increase in the size of the capacitor unit 34 is suppressed.

[0053] Note that what has been described above is an embodiment of the present invention, and the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art without departing from the gist thereof.

[0054] In the foregoing embodiments, the annular ferrite cores 32a and 32b were non-segmented, but the present invention is not limited thereto, and they may be segmented. When the annular ferrite cores 32a and 32b are segmented, even if the two bus bars 80 do not each include a linear shape, the two bus bars 80 can be easily inserted therethrough.

[0055] In the foregoing embodiments, the annular ferrite cores 32a and 32b corresponded to the "inductance" in the present invention. However, for example, the "inductance" is not limited to ferrite cores and may be a coil such as an air-core coil.

[0056] In the foregoing embodiments, the filter 30 included two annular ferrite cores 32a and 32b and one capacitor unit 34, but the present invention is not limited thereto. For example, a mode including one annular ferrite core and one capacitor unit 34, such as in Modification 1 or Modification 2, may be used. For example, a mode including two capacitor units 34 and one annular ferrite core, such as in Modification 3, may be used. The "noise removal filter" in the present invention may be any mode in which the annular ferrite cores 32a and 32b and the capacitor unit 34 are combined, regardless of the number.

[0057] In the foregoing embodiments, the two bus bars 80 were each composed of two members, namely, the main member 82 and the connecting member 88 connected to one end portion 82t1 of the main member 82, but the present invention is not limited thereto. For example, the two bus bars 80 may each be composed of three members, namely, a main member having only a straight portion 84 and two connecting members connected to one end portion and the other end portion in the longitudinal direction of the main member, respectively. In such a mode, the connecting member connected to the other end portion in the longitudinal direction of the main member has a shape similar to the bent portion 86 in the foregoing embodiments, for example, when connected to the main member.

[0058] In the foregoing embodiments, the two bus bars 80 each included a straight portion 84 extending linearly. However, the present invention is not limited thereto. For example, the "extension portion" in the present invention may not extend linearly, but may have a shape that bends in an arc shape or bends at a sharp angle, that is, a shape that extends linearly. Even with such a shape, it is possible to insert the two bus bars 80 into the non-separable annular ferrite cores 32a and 32b from one end side in the longitudinal direction of the "extension portion".

[0059] In the foregoing embodiments, the two bus bars 80 had a shape that was line-symmetric with respect to each other about the straight line C. However, the present invention is not limited thereto.

[0060] In the foregoing embodiments, the other end portion 38t2 of the leaf spring 38 had a spring structure that pressed the surface of the straight portion 84 of the bus bar 80 by an urging force. However, the present invention is not limited thereto. For example, the capacitor unit 34 may be provided with a plate-shaped body made of metal that does not have a spring structure instead of the leaf spring 38, and the plate-shaped body may be welded to the surface of the straight portion 84 of the bus bar 80.

[0061] In the foregoing embodiments, two capacitors, i.e., the first capacitor 90 and the second capacitor 92, were mounted on the capacitor unit 34. However, the present invention is not limited thereto. For example, only one of the first capacitor 90 and the second capacitor 92 may be mounted on the capacitor unit 34. For example, three or more capacitors may be mounted on the capacitor unit 34. Note that the shapes of the first conduction portion 36a and the second conduction portion 36b of the capacitor unit 34 are appropriately changed according to the number of capacitors to be mounted.

[0062] In the foregoing embodiments, the filter 30 was attached to the first power line PL1 between the power control device 54 and the high-voltage battery 46, but the present invention is not limited thereto. For example, the filter 30 may be attached to the second power line PL2 between the power control device 54 and the auxiliary battery 48. For example, the filter 30 may be attached to the third power line PL3 between the power control device 54 and the electric motor MG. In this case, corresponding to the three third power lines PL3, there are three busbars.

[0063] In the foregoing embodiments, the drive unit 70 was such that the transaxle 72 and the power control device 54 were housed in the same case 18, but the present invention is not limited thereto. For example, the present invention is also applicable to a mode in which the transaxle 72 and the power control device 54 are housed in separate cases. In this case, the member that partitions the space for housing the power control device 54 corresponds to the "case".

[0064] In the foregoing embodiments, the electric motor MG was a so-called motor generator, but for example, the electric motor MG may be a rotary electric machine having only one of the motor function and the generator function. Also, the number of phases of the electric motor MG is not limited to three phases.

[0065] In the foregoing embodiments, the transaxle 72 included the electric motor MG as one electric motor, but the present invention is not limited thereto. The transaxle 72 may include two or more electric motors. Also, in the foregoing embodiments, the vehicle 10 was an electric vehicle equipped with the electric motor MG as a power source, but the present invention is not limited thereto. For example, the present invention is also applicable to a vehicle having an engine and the electric motor MG as power sources, that is, a hybrid vehicle.

Explanation of Reference Numerals

[0066] 30: Noise removal filter, 32a, 32b: Ferrite core (inductance), 34: Capacitor unit, 38: Leaf spring, 54: Power control device, 80: Bus bar, 82: Main member, 84: Straight part (extension part), 84t1: One end part (one end part), 84t2: The other end part (the other end part), 86: Bent part, 88: Connecting member, 90: First capacitor (capacitor), 92: Second capacitor (capacitor)

Claims

1. A noise removal filter for removing noise propagating through a plurality of busbars to which the output of a power control device is supplied, comprising: an annular inductor through which the plurality of busbars are inserted and mounted; a capacitor unit having a capacitor in which one terminal is electrically connected to the surfaces of the plurality of busbars respectively and the other terminal is electrically connected to a reference potential; wherein the mounting positions of the inductor and the capacitor unit with respect to the plurality of busbars are each variable. A noise removal filter characterized by the above.

2. Each of the plurality of busbars has a main member including an extending portion extending linearly, and a connecting member connected to one end portion in the longitudinal direction of the extending portion. The noise removal filter according to claim 1, characterized by the above.

3. The extending portion extends linearly. The noise removal filter according to claim 2, characterized by the above.

4. Each of the plurality of busbars has a bent portion. The bent portion extends further outward from the other end portion opposite to the one end portion in the longitudinal direction of the extending portion, and includes a portion extending in a direction different from the longitudinal direction of the extending portion. The noise removal filter according to claim 2 or 3, characterized by the above.

5. Each of the plurality of busbars is held by a conductive leaf spring provided in the capacitor unit, and the surfaces of the plurality of busbars are electrically connected to the one terminal of the capacitor via the leaf spring respectively. The noise removal filter according to any one of claims 1 to 3, characterized by the above.

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