Noise filter device

Abstract

To provide a noise filter device capable of stably presenting desired noise suppression effects.SOLUTION: A noise filter device 100 comprises: a printed circuit board 103 including a first wiring layer 103a, a second wiring layer 103b and a ground wiring layer 103c which are electrically connected with a first bus bar 101 and a second bus bar 102; an X capacitor 104 and Y capacitors 105a and 105b for noise filtering which are loaded on the printed circuit board 103 and electrically connected with the wiring layers; and a flexible conductive member which is held between the first and second bus bars 101 and 102 and the printed circuit board 103. The conductive member forms linear electrical connection parts 106a and 106b in a bus bar extension direction which is orthogonal to plate thickness directions and width directions of the first bus bar 101 and the second bus bar 102 between the first and second bus bars 101 and 102 and the first and second wiring layers 103a and 103b.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an apparatus for suppressing electromagnetic noise. [Background technology]

[0002] Conventionally, motor drive systems have been used in electric vehicles such as electric cars and trains, in which DC power supplied from a DC power source is converted into AC power of a desired frequency and voltage by an inverter, and the AC power is output to the AC motor to drive the AC motor. In such motor drive systems, a relatively large current flows between the DC power source and the inverter, so they are generally electrically connected via a bus bar.

[0003] In a motor drive system, DC power is converted to AC power by the switching operation of the inverter, but the current flowing between the DC power supply and the inverter generates noise (electromagnetic noise) due to the inverter's switching operation. This noise can have a negative effect on surrounding electronic devices, so it must be suppressed as much as possible.

[0004] Patent Document 1 discloses a known technology for noise suppression in a motor drive system for an electric vehicle. Patent Document 1 describes a filter including: a circuit board mounted with a capacitor and having multiple conductive paths; a first conductive rail fixed on a first surface of the circuit board and electrically connected to at least one of the multiple conductive paths; and a second conductive rail fixed on a second surface of the circuit board and electrically connected to at least one of the multiple conductive paths. In this filter, the first and second conductive rails, which correspond to bus bars, are disposed on one surface (first surface) and the other surface (second surface) of the circuit board, respectively, thereby electrically connecting the conductive rails and the conductive paths of the circuit board with low inductance, thereby enhancing noise suppression effects. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-50034 Summary of the Invention [Problem to be solved by the invention]

[0006] In the filter of Patent Document 1, the conductive rail is fixed to the circuit board using fixing means such as screws, brackets, or rivets, thereby electrically connecting the conductive rail and the conductive path of the circuit board. However, with this type of connection method, the designed contact area between the conductive rail and the conductive path of the circuit board is not always achieved due to various factors, such as dimensional errors and assembly errors of the conductive rail and the circuit board during manufacturing, warping or unevenness of their surfaces, and loosening of the fixing means due to continuous application of vibration during operation. As a result, the inductance between the conductive rail and the conductive path cannot be sufficiently reduced, and the desired noise suppression effect may not be achieved.

[0007] The present invention has been made in view of the above-mentioned problems, and a main object of the present invention is to provide a noise filter device that can stably exhibit a desired noise suppression effect. [Means for solving the problem]

[0008] A noise filter device according to the present invention comprises a bus bar made of a conductive flat member, a printed circuit board having a wiring layer electrically connected to the bus bar, a noise filter capacitor mounted on the printed circuit board and electrically connected to the wiring layer, and a flexible conductive member sandwiched between the bus bar and the printed circuit board, wherein the conductive member forms a linear electrical connection between the bus bar and the wiring layer along an extension direction of the bus bar that is perpendicular to the thickness and width directions of the bus bar. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a noise filter device that can stably exhibit a desired noise suppression effect. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a plan view of a noise filter device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing a state in which the magnetic core and mold resin are removed from FIG. 1. [Figure 3] 1A and 1B are diagrams illustrating an installation structure of a conductive member according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view of a noise filter device according to a first embodiment of the present invention. [Figure 5] 1 is a cross-sectional view of a noise filter device according to a first embodiment of the present invention. [Figure 6] 1 is a cross-sectional view of a noise filter device according to a first embodiment of the present invention. [Figure 7] FIG. 10 is a diagram showing a connection portion of a Y capacitor on a printed circuit board. [Figure 8] FIG. 5 is a plan view of a noise filter device according to a second preferred embodiment of the present invention. [Figure 9] FIG. 5 is a cross-sectional view of a noise filter device according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a diagram illustrating a modified example of the noise filter device. [Figure 11] FIG. 10 is a diagram illustrating a modified example of the noise filter device. [Figure 12] 10A and 10B are diagrams illustrating an installation structure of a conductive member according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a cross-sectional view of a noise filter device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] (First embodiment) FIG. 1 is a plan view of a noise filter device 100 according to a first embodiment of the present invention. FIG. 2 is a view showing the state in which a magnetic core 107 and a molded resin 108 have been removed from FIG. 1. FIG. 3 is a view showing an installation structure of a conductive member 106 according to the first embodiment of the present invention. FIGS. 4, 5, and 6 are cross-sectional views of the noise filter device 100 according to the first embodiment of the present invention. FIG. 4 shows the A-A' cross section of FIG. 1, FIG. 5 shows the B-B' cross section of FIG. 1, and FIG. 6 shows the C-C' cross section of FIG. 1, respectively. FIG. 7 is a view showing a connection portion of Y capacitors 105a and 105b on a printed circuit board 103. The noise filter device 100 according to the first embodiment of the present invention will be described below with reference to these figures.

[0013] The noise filter device 100 is installed between a DC power supply such as a high-voltage battery and an inverter in, for example, a motor drive system mounted on a vehicle, to filter the current flowing between them and suppress unnecessary noise. As shown in Fig. 1, the noise filter device 100 includes a first bus bar 101, a second bus bar 102, a printed circuit board 103, an X capacitor 104, Y capacitors 105a and 105b, a conductive member 106 (not shown in Fig. 1), and a magnetic core 107.

[0014] First bus bar 101 and second bus bar 102, which are conductive flat-plate members, are arranged on top of each other with printed circuit board 103 sandwiched between them. The surfaces of first bus bar 101 and second bus bar 102, except for their ends, are covered with molded resin 108, and they are fixed to each other by fixing members (e.g., screws) inserted into fixing holes 108a provided in molded resin 108. Furthermore, first bus bar 101 and second bus bar 102 have mounting holes 101a and 102a at both ends, respectively, and are connected to wiring in the motor drive system by connecting members (e.g., screws) inserted into mounting holes 101a and 102a. As a result, first bus bar 101 and second bus bar 102 are electrically connected to the positive and negative sides, respectively, of a DC power supply in the motor drive system, and are also electrically connected to an inverter in the motor drive system.

[0015] Printed circuit board 103 is sandwiched between first bus bar 101 and second bus bar 102 and fixed in a predetermined positional relationship with respect to first bus bar 101 and second bus bar 102. Printed circuit board 103 has first wiring layer 103a provided on the front surface side facing first bus bar 101 and electrically connected to first bus bar 101 via conductive member 106, second wiring layer 103b provided on the back surface side facing second bus bar 102 and electrically connected to second bus bar 102 via conductive member 106, and ground wiring layer 103c electrically connected to ground potential. The first wiring layer 103a carries a current that flows between the first bus bar 101 and the X capacitor 104 or the Y capacitor 105a via the conductive member 106, and the second wiring layer 103b carries a current that flows between the second bus bar 102 and the X capacitor 104 or the Y capacitor 105b via the conductive member 106. The ground wiring layer 103c carries a current that flows between the first bus bar 101 and the Y capacitors 105a or 105b via the conductive member 106. That is, the first wiring layer 103a, the second wiring layer 103b, and the ground wiring layer 103c are flat conductors that extend two-dimensionally from the conductive member 106 to the X capacitor 104 or the Y capacitors 105a or 105b, respectively. These wiring layers 103a to 103c are insulated from each other on the printed circuit board 103.

[0016] The X capacitor 104 and the Y capacitors 105a and 105b are each disposed at a predetermined position on the printed circuit board 103. Specifically, the X capacitor 104 is disposed on one side (upper side in FIG. 1) of the conductive member 106 on the printed circuit board 103, side by side along the extension direction of the conductive member 106 (left and right direction in FIG. 1). The Y capacitors 105a and 105b are disposed on the other side (lower side in FIG. 1) of the conductive member 106 on the printed circuit board 103, side by side along the extension direction of the conductive member 106 (left and right direction in FIG. 1).

[0017] One end of the X capacitor 104 is electrically connected to the first wiring layer 103a, and the other end is electrically connected to the second wiring layer 103b. In the printed circuit board 103, a via (through hole) (not shown) is provided near the mounting position of the X capacitor 104, penetrating to the second wiring layer 103b on the back side. The X capacitor 104 is electrically connected to the second wiring layer 103b by connecting the other end of the X capacitor 104 to this via. As a result, the X capacitor 104 is electrically connected between the first bus bar 101 and the second bus bar 102, and the normal mode noise flowing through the first bus bar 101 and the second bus bar 102 is suppressed by the X capacitor 104. In the example of FIG. 1, three X capacitors 104 are arranged on the printed circuit board 103, but the number of X capacitors 104 is not limited to this.

[0018] Ground wiring layers 103c are provided on both sides of the printed circuit board 103 near the mounting positions of the Y capacitors 105a and 105b, and through-holes 109a are provided through these ground wiring layers 103c. For example, as shown in Fig. 5, conductive connecting screws 109b are inserted into the through-holes 109a, and the printed circuit board 103 is fixed via these connecting screws 109b to protrusions 109c provided on a portion of the motor drive system at ground potential (for example, the housing). As a result, the ground wiring layers 103c are electrically connected to the protrusions 109c and are grounded.

[0019] 7, vias (through holes) 110a, 110b, 110c, and 110d are provided near the mounting positions of the Y capacitors 105a and 105b on the printed circuit board 103. The via 110a passes through a first wiring layer 103a provided on the front side of the printed circuit board 103 and a pad provided on the back side and insulated from the ground wiring layer 103c. The via 110b passes through a pad provided on the front side of the printed circuit board 103 and insulated from the ground wiring layer 103c and a second wiring layer 103b provided on the back side. The vias 110c and 110d pass through the ground wiring layers 103c provided on the front and back sides of the printed circuit board 103, respectively.

[0020] One end of Y capacitor 105a is connected to via 110a, thereby electrically connecting it to first wiring layer 103a. The other end is connected to via 110c, thereby electrically connecting it to ground wiring layer 103c. Meanwhile, one end of Y capacitor 105b is connected to via 110b, thereby electrically connecting it to second wiring layer 103b. The other end is connected to via 110d, thereby electrically connecting it to ground wiring layer 103c. As a result, Y capacitors 105a and 105b are electrically connected between first bus bar 101 and second bus bar 102 and the ground potential, respectively, and common-mode noise flowing through first bus bar 101 and second bus bar 102 is suppressed.

[0021] The conductive member 106 has an elongated spiral shape along the extension direction (bus bar extension direction) of the first bus bar 101 and the second bus bar 102, and is sandwiched between the first bus bar 101 and the front side (first wiring layer 103a side) of the printed circuit board 103, and between the second bus bar 102 and the back side (second wiring layer 103b side) of the printed circuit board 103. This allows the first bus bar 101 and the first wiring layer 103a, and the second bus bar 102 and the second wiring layer 103b to be electrically connected to each other via the conductive member 106.

[0022] Here, for example, as shown in Fig. 3, a metal plate formed into an elongated spiral shape is used for conductive member 106. This provides flexibility to conductive member 106 sandwiched between first bus bar 101 and first wiring layer 103a, and conductive member 106 sandwiched between second bus bar 102 and second wiring layer 103b, thereby ensuring stable electrical connection therebetween.

[0023] Specifically, on the front surface side of printed circuit board 103, as shown in, for example, FIGS. 3 and 6 , first bus bar 101 and printed circuit board 103 are fixed together in a state in which conductive member 106 having an elongated spiral shape is placed in fitting groove 101b formed along the bus bar extension direction on the surface of first bus bar 101 facing printed circuit board 103. By forming fitting groove 101b so that the depth of fitting groove 101b is smaller than the height of conductive member 106, conductive member 106 is sandwiched between first bus bar 101 and printed circuit board 103 in a state in which it is slightly compressed in the up-down direction (direction perpendicular to the extension direction of conductive member 106). As a result, as shown in FIG. 3 , elongated linear electrical connection portion 106a is formed between conductive member 106 and first wiring layer 103a of printed circuit board 103 along the bus bar extension direction, which is perpendicular to the plate thickness and width directions of first bus bar 101. For example, if the width of first bus bar 101 is 15 mm or more, electrical connection portion 106a may be formed with a smaller width of about 2 mm.

[0024] Similarly, on the back side of printed circuit board 103, second bus bar 102 and printed circuit board 103 are fixed together with conductive member 106 having an elongated spiral shape disposed in fitting groove 102b formed along the bus bar extension direction on the surface of second bus bar 102 facing printed circuit board 103. By forming fitting groove 102b so that the depth of fitting groove 102b is smaller than the height of conductive member 106, conductive member 106 is sandwiched between second bus bar 102 and printed circuit board 103 in a state where it is slightly compressed in the vertical direction. As a result, elongated linear electrical connection portion 106b is formed between conductive member 106 and second wiring layer 103b of printed circuit board 103 along the bus bar extension direction, which is perpendicular to the thickness and width directions of second bus bar 102.

[0025] The electrical connection portions 106a and 106b are formed elongated along the bus bar extension direction. As described above, the X capacitor 104 and the Y capacitors 105a and 105b are arranged side by side along the extension direction of the conductive member 106 on the printed circuit board 103. This structure shortens the paths of currents flowing from the first bus bar 101 to the X capacitor 104 and the Y capacitor 105a via the conductive member 106 and the first wiring layer 103a, as indicated by the arrows 111 in FIG. 2 . The same applies to the paths of currents flowing from the second bus bar 102 to the X capacitor 104 and the Y capacitor 105b via the conductive member 106 and the second wiring layer 103b. As a result, the noise suppression effect can be improved by reducing the inductance of the noise current paths.

[0026] Furthermore, a repulsive force from the crushed conductive member 106 is applied to the electrical connection portions 106a and 106b. This increases the adhesion between the first bus bar 101 and the second bus bar 102 and the printed circuit board 103 at the electrical connection portions 106a and 106b. Therefore, even if there is a slight dimensional error or assembly error between the first bus bar 101 or the second bus bar 102 and the printed circuit board 103, if there is warping or unevenness on the surfaces of these, or if vibrations are continuously applied during operation of the noise filter device 100, it is possible to stably maintain the electrical connection state between the first bus bar 101 and the first wiring layer 103a at the electrical connection portion 106a and the electrical connection state between the second bus bar 102 and the second wiring layer 103b at the electrical connection portion 106b.

[0027] The magnetic cores 107 are arranged so as to surround the peripheries of the first bus bar 101 and the second bus bar 102, and suppress noise contained in the current flowing through the first bus bar 101 and the second bus bar 102. Note that, although the magnetic cores 107 are arranged at both ends of the first bus bar 101 and the second bus bar 102 in the example of Fig. 1, the number and positions of the magnetic cores 107 are not limited to this.

[0028] According to the first embodiment of the present invention described above, the following advantageous effects are achieved.

[0029] (1) The noise filter device 100 includes a first bus bar 101 and a second bus bar 102 each made of a conductive flat plate-like member, a printed circuit board 103 having a first wiring layer 103a, a second wiring layer 103b, and a ground wiring layer 103c electrically connected to the first bus bar 101 and the second bus bar 102, an X capacitor 104 and Y capacitors 105a and 105b for noise filtering mounted on the printed circuit board 103 and electrically connected to these wiring layers, and a flexible conductive member 106 sandwiched between the first bus bar 101, the second bus bar 102, and the printed circuit board 103. The conductive member 106 forms linear electrical connection portions 106a, 106b between the first bus bar 101 and the first wiring layer 103a and between the second bus bar 102 and the first wiring layer 103a and the second wiring layer 103b, respectively, along the bus bar extension direction perpendicular to the plate thickness direction and width direction of the first bus bar 101 and the second bus bar 102. This makes it possible to stably maintain the electrical connection state between the first bus bar 101 and the first wiring layer 103a at the electrical connection portion 106a and the electrical connection state between the second bus bar 102 and the second wiring layer 103b at the electrical connection portion 106b, and as a result, it is possible to provide the noise filter device 100 that can stably exert the desired noise suppression effect.

[0030] (2) First bus bar 101 and second bus bar 102 have fitting grooves 101b and 102b, respectively, on the surfaces facing printed circuit board 103. Conductive member 106 is disposed in fitting grooves 101b and 102b. This configuration allows conductive member 106 to be reliably pressed against first wiring layer 103a and second wiring layer 103b of printed circuit board 103, thereby forming linear electrical connection portions 106a and 106b that extend in the bus bar extension direction.

[0031] (3) In the noise filter device 100, the plurality of capacitors 104, 105a, and 105b are arranged side by side along the bus bar extension direction on the printed circuit board 103. This arrangement shortens the path of current flowing from the first bus bar 101 and the second bus bar 102 to each capacitor via the conductive member 106 and each wiring layer, thereby improving the noise suppression effect by reducing the inductance of the noise current path.

[0032] (4) First wiring layer 103a, second wiring layer 103b, and ground wiring layer 103c are flat conductors that extend two-dimensionally from conductive member 106 to X capacitor 104 and Y capacitors 105a and 105b, respectively, and currents that flow between first bus bar 101 or second bus bar 102 and X capacitor 104 or Y capacitors 105a and 105b are passed through first wiring layer 103a and second wiring layer 103b via conductive member 6. This configuration makes it possible to further reduce the inductance of the noise current path.

[0033] (5) In the noise filter device 100, the first bus bar 101 is connected to the positive electrode of a DC power supply, and the second bus bar 102 is connected to the negative electrode of the DC power supply. The first wiring layer 103a is electrically connected to the first bus bar 101, the second wiring layer 103b is electrically connected to the second bus bar 102, and the ground wiring layer 103c is electrically connected to ground potential. The X capacitor 104 is connected to the first wiring layer 103a and the second wiring layer 103b, the Y capacitor 105a is connected to the first wiring layer 103a and the ground wiring layer 103c, and the Y capacitor 105b is connected to the second wiring layer 103b and the ground wiring layer 103c. This configuration makes it possible to suppress normal mode noise and common mode noise flowing through the first bus bar 101 and the second bus bar 102.

[0034] (Second embodiment) In the first embodiment, an example was described in which electrical connection portions 106a and 106b are formed at one location each along the bus bar extension direction on the surfaces of first bus bar 101 and second bus bar 102 facing printed circuit board 103. In contrast to this, in the following second embodiment, an example will be described in which electrical connection portions 106a and 106b are formed at multiple locations along the bus bar extension direction.

[0035] Fig. 8 is a plan view of a noise filter device 100A according to a second embodiment of the present invention. Fig. 9 is a cross-sectional view of the noise filter device 100A according to the second embodiment of the present invention, showing the cross-section D-D' of Fig. 8. The noise filter device 100A according to the second embodiment of the present invention will be described below with reference to these drawings. Note that descriptions of parts of the noise filter device 100A that are common to the noise filter device 100 described in the first embodiment will be omitted.

[0036] In this embodiment, fitting grooves 101b are formed in two locations on the surface of first bus bar 101 facing printed circuit board 103 on the front side of printed circuit board 103. Conductive members 106 are respectively disposed in these two fitting grooves 101b. As a result, parallel electrical connection portions 106a are formed between each conductive member 106 and first wiring layer 103a of printed circuit board 103 along the extending direction of the bus bar.

[0037] Similarly, on the front surface side of printed circuit board 103, fitting grooves 102b are formed in two locations on the surface of second bus bar 102 facing printed circuit board 103. Conductive members 106 are respectively disposed in these two fitting grooves 102b. As a result, parallel electrical connection portions 106b are respectively formed between each conductive member 106 and second wiring layer 103b of printed circuit board 103 along the extending direction of the bus bar.

[0038] In this embodiment, the above structure makes it possible to further shorten the distance from the electrical connection portions 106a and 106b to the X capacitor 104 and the Y capacitors 105a and 105b than in the first embodiment, thereby further reducing the inductance of the noise current path and improving the noise suppression effect.

[0039] It is preferable that the electrical connection portion 106a formed on the front surface side of the printed circuit board 103 on the side of the Y capacitors 105a and 105b be provided over at least the entire area of ​​the portion where the distance from the center line of the width direction of the first bus bar 101 to the Y capacitor 105a is shortest. Similarly, it is preferable that the electrical connection portion 106b formed on the back surface side of the printed circuit board 103 on the side of the Y capacitors 105a and 105b be provided over at least the entire area of ​​the portion where the distance from the center line of the width direction of the second bus bar 102 to the Y capacitor 105b is shortest. In this way, it is possible to reliably reduce the inductance of the noise current path as described above, thereby improving the noise suppression effect.

[0040] According to the second embodiment of the present invention described above, the noise filter device 100A has a plurality of electrical connection portions 106a, 106b that are parallel to each other, thereby achieving a further improvement in the noise suppression effect.

[0041] (Variation) In the first and second embodiments described above, the number and positions of the electrical connection portions 106a, 106b formed on the front and back sides of the printed circuit board 103 are not limited to the above examples. For example, as shown in FIG. 10 , two electrical connection portions 106a may be provided on the front side of the printed circuit board 103, while one electrical connection portion 106b may be provided on the back side of the printed circuit board 103. Furthermore, as shown in FIG. 11 , the positions of the electrical connection portion 106a on the front side of the printed circuit board 103 and the positions of the electrical connection portion 106b on the back side of the printed circuit board 103 may not overlap with each other in the thickness direction of the first bus bar 101 and the second bus bar 102. These modifications can also achieve the same effects as those described in the first and second embodiments.

[0042] (Third embodiment) In the first and second embodiments, an example has been described in which a metal plate formed in an elongated spiral shape is used as the conductive member 106, and elongated linear electrical connection portions 106a, 106b are formed along the bus bar extension direction between the conductive member 106 and the first wiring layer 103a and the second wiring layer 103b of the printed circuit board 103, respectively. However, something other than this may be used as the conductive member 106.

[0043] Below, as a third embodiment of the present invention, an example will be described in which a finger stock, which is a flexible metal gasket, is used as the conductive member 106. The appearance and main configuration of the noise filter device according to this embodiment are the same as those of the first embodiment. Therefore, below, an example will be described in which the conductive member 106 of this embodiment is applied to the noise filter device 100 described in the first embodiment.

[0044] Fig. 12 is a diagram showing an installation structure of conductive member 106 according to the third embodiment of the present invention. Fig. 13 is a diagram showing a cross-sectional structure of first bus bar 101, second bus bar 102, printed circuit board 103, and conductive member 106 when conductive member 106 according to the third embodiment of the present invention is applied, and corresponds to Fig. 6 (the CC' cross-sectional view of Fig. 1) described in the first embodiment.

[0045] 13, for example, the conductive member 106 is arranged so as to be sandwiched between the first bus bar 101 and the second bus bar 102 and the printed circuit board 103 and to be in close contact with them. Therefore, unlike the first embodiment, even if the fitting grooves 101b and 102b are not provided in the first bus bar 101 and the second bus bar 102, thin linear electrical connection portions 106a and 106b are formed between the conductive member 106 and the first wiring layer 103a and the second wiring layer 103b of the printed circuit board 103 along the bus bar extension direction perpendicular to the plate thickness direction and width direction of the first bus bar 101 and the second bus bar 102, respectively.

[0046] 12 and 13 show an example in which one electrical connection portion 106a and one electrical connection portion 106b are formed on the first bus bar 101 side and the second bus bar 102 side, but a structure similar to that of the second embodiment and its modified examples described above may also be applied to this embodiment. That is, a finger stock may be used as the conductive member 106, and the electrical connection portions 106a and 106b may be formed at the positions shown in FIGS. 8 to 11.

[0047] According to the third embodiment described above, it is possible to obtain the same effects as those described in the first and second embodiments.

[0048] The present invention is not limited to the various embodiments and modifications described above, and includes various other modifications. For example, the above-described embodiments have been specifically described to clearly explain the present invention, and are not necessarily limited to those having all of the described configurations. Furthermore, part of the configuration of one embodiment can be replaced with part of the configuration of another embodiment. Furthermore, the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, part of the configuration of each embodiment can be deleted, and part of another configuration can be added or replaced with part of another configuration.

[0049] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention. [Explanation of symbols]

[0050] 100,100A...Noise filter device 101···1st bus bar 102···Second bus bar 103 Printed circuit board 104···X capacitor 105a, 105b... Y capacitor 106 Conductive member 107 Magnetic Core 108···Molding resin

Claims

1. a bus bar made of a conductive flat plate-shaped member; a printed circuit board having a wiring layer electrically connected to the bus bar; a noise filter capacitor mounted on the printed circuit board and electrically connected to the wiring layer; a flexible conductive member sandwiched between the bus bar and the printed circuit board, The conductive member forms a linear electrical connection portion between the bus bar and the wiring layer along a bus bar extension direction perpendicular to a plate thickness direction and a width direction of the bus bar. Noise filtering device.

2. 2. The noise filter device according to claim 1, the bus bar has a fitting groove on a surface facing the printed circuit board, The conductive member is disposed in the fitting groove. Noise filtering device.

3. 2. The noise filter device according to claim 1, A plurality of the capacitors are arranged side by side along the extending direction of the bus bar. Noise filtering device.

4. 2. The noise filter device according to claim 1, The wiring layer has a flat conductor that extends two-dimensionally from the conductive member to the capacitor. Noise filtering device.

5. 2. The noise filter device according to claim 1, the bus bars include a first bus bar connected to a positive electrode side of a DC power supply and a second bus bar connected to a negative electrode side of the DC power supply, the wiring layer includes a first wiring layer electrically connected to the first bus bar, a second wiring layer electrically connected to the second bus bar, and a ground wiring layer electrically connected to a ground potential; The capacitors include a second capacitor connected to the first wiring layer and the ground wiring layer, and a third capacitor connected to the second wiring layer and the ground wiring layer. Noise filtering device.

6. 2. The noise filter device according to claim 1, A plurality of the electrical connection portions are arranged parallel to each other. Noise filtering device.

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