Ac line filter

Abstract

To provide an AC line filter which allows downsizing while suppressing reduction in electrostatic capacity of a capacitor.SOLUTION: An AC line filter 1 comprises a coil part 10 and a capacitor part 20. In the coil part 10, a surface 10A on one side in a first direction is mounted on a substrate 2 such that it faces the substrate 2, and a surface 10B on the other side in the first direction is provided such that it can directly exchange heat with a cooling plate 60 through which a cooling fluid internally circulates. In the capacitor part 20, a surface 20A on the one side in the first direction is mounted on the substrate 2 such that it faces the substrate 2, and a surface 20B on the other side in the first direction is provided away from the cooling plate 60. The substrate 2 is connected to the cooling plate 60 via a heat transfer part 65 provided between a coil mounting part 10R on which the coil part 10 is mounted and a capacitor mounting part 20R on which the capacitor part 20 is mounted.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an AC line filter including a coil section and a capacitor section. [Background technology]

[0002] Conventionally, vehicles are equipped with electrical equipment, which includes electronic components such as switching elements, coils, and capacitors. Some of these electronic components generate heat when current is applied, and are cooled to protect them from such heat. Technologies related to cooling such electronic components are described, for example, in Patent Documents 1 and 2, the sources of which are listed below.

[0003] Patent Document 1 describes a voltage conversion device. This voltage conversion device has an AC filter unit, a charger, a DC / DC conversion unit, a capacitor, and a power conversion unit housed inside a housing. The AC filter unit and the rectifier unit, power factor correction unit, capacitor, inverter, and transformer that make up the charger are separated by a partition member provided with heat dissipation fins. In particular, the coils of the DC / DC conversion unit, capacitor, power conversion unit, and power factor correction unit are provided in direct contact with the heat dissipation fins and are cooled.

[0004] Patent Document 2 describes an electronic control device. This electronic control device has a heat sink attached to a substrate on which multiple electronic components are mounted. The substrate is coated with a resin, and exposed wiring portions that are exposed from the resin coating are provided at the four corners and the center of the substrate. The exposed wiring portions on the mounting surface of the substrate are configured to abut against the heat sink. A cover with a nut fixed thereto is provided on the surface opposite the mounting surface of the substrate, and the substrate is fastened to the nut via a screw inserted into a hole provided in the exposed wiring portion of the substrate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-61892 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-197684 Summary of the Invention [Problem to be solved by the invention]

[0006] For example, when DC power is input to electrical equipment such as an inverter or a DC / DC converter, a filter circuit (corresponding to the "AC line filter" in this application) is used to reduce noise contained in the DC power. Such a filter circuit includes a common mode choke coil (corresponding to the "coil section" in this application) and a capacitor (corresponding to the "capacitor section" in this application). When considering common mode noise, not all of the common mode choke coils and capacitors constituting the filter circuit generate heat; some generate relatively little heat. For example, if a capacitor is placed near a common mode choke coil that generates a relatively large amount of heat, its capacitance will decrease in accordance with the temperature. While it is conceivable to space the common mode choke coil and capacitor, which generate a relatively large amount of heat, apart from each other to prevent this capacitance decrease, this would result in a large circuit board size. The techniques described in Patent Documents 1 and 2 do not take into account the placement of such coils and capacitors, and therefore require improvement before they can be applied to AC line filters.

[0007] Therefore, there is a demand for an AC line filter that can be made compact while suppressing the decrease in capacitance of the capacitor. [Means for solving the problem]

[0008] A characteristic configuration of an AC line filter according to the present invention is an AC line filter comprising a coil section and a capacitor section, wherein the coil section is mounted on a substrate with one surface in a first direction facing the substrate and the other surface in the first direction is provided so as to be able to directly exchange heat with a cooling plate through which a cooling fluid circulates, the capacitor section is mounted on the substrate with one surface in the first direction facing the substrate and the other surface in the first direction is provided so as to be spaced apart from the cooling plate, and the substrate is connected to the cooling plate via a heat transfer section provided between a coil mounting section on which the coil section is mounted and a capacitor mounting section on which the capacitor section is mounted.

[0009] With this characteristic configuration, heat from the coil portion (winding), which generates heat due to the current flowing through it, is transferred directly to the cooling plate from the other side of the coil portion, making it easier to cool the coil portion. Furthermore, a heat transfer section is provided between the coil portion and the capacitor portion, making it difficult for heat from the coil portion to be transferred to the capacitor portion. Therefore, even when common-mode noise occurs, it is possible to suppress a decrease in the capacitance of the capacitor portion (the capacitors that make up the capacitor portion). Furthermore, since heat from the coil portion is transferred directly to the cooling plate from the other side as described above, making it easier to cool the coil portion, the distance between the coil portion and the capacitor portion can be shortened compared to a configuration in which heat from the coil portion is not transferred directly to the cooling plate from the other side. Therefore, it is possible to suppress an increase in the size of the circuit board. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a configuration of a power supply circuit to which an AC line filter is applied. [Figure 2] FIG. 1 is a circuit diagram of an AC line filter. [Figure 3] FIG. 10 is a diagram showing how the AC mains filter is mounted on a circuit board. [Figure 4] FIG. 2 is a diagram showing the flow paths of the cooling plate. [Figure 5]10A and 10B are diagrams illustrating the relationship between a coil portion, a condenser portion, and a flow path. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The AC line filter according to the present invention is provided to reduce common-mode noise. The AC line filter 1 according to this embodiment will be described below. However, the AC line filter 1 is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the invention.

[0012] In this embodiment, an example will be described in which the AC line filter 1 is provided on a power supply line 30 that is used to charge a high-voltage battery 4 that supplies power to a vehicle's driving motor M, and to output AC power to the outside based on DC power from the high-voltage battery 4.

[0013] 1 is a block diagram showing the configuration of a power supply circuit to which an AC line filter 1 is applied. The AC line filter 1 is provided between an input / output unit 90 and a power supply module 42. In this embodiment, a switching unit 41 is provided between the AC line filter 1 and the power supply module 42. The input / output unit 90 receives AC power (AC power from a commercial power source) when charging the high-voltage battery 4, and outputs AC power to the outside when the power stored in the high-voltage battery 4 is used as an alternative to the commercial power source. The AC power from the commercial power source may be input in single phase (single-phase three-wire or single-phase two-wire) or three phase (three-phase three-wire or three-phase four-wire).

[0014] As will be described in detail later, AC line filter 1 includes a coil section 10 and a capacitor section 20 (see FIG. 2). Coil section 10 is a toroidal common mode choke coil formed by winding a wire around a toroidal core. Capacitor section 20 is a film capacitor. In AC line filter 1, coil section 10 and capacitor section 20 form an LC resonant circuit, which is capable of reducing common mode noise.

[0015] The switching unit 41 switches between a state in which AC power from a commercial power source input to the input / output unit 90 is supplied to the power supply module 42 described later in single phase (single-phase three-wire, single-phase two-wire) and a state in which it is supplied in three phase (three-phase three-wire, three-phase four-wire).

[0016] When AC power is transmitted from the input / output unit 90, the power supply module 42 converts the AC power into DC power that can charge the high-voltage battery 4, and when AC power is output from the input / output unit 90, it converts the DC power from the high-voltage battery 4 into AC power.

[0017] The power supply module 42 can also step down the DC voltage constituting the DC power transmitted from the high-voltage battery 4 to a voltage value that can charge the low-voltage battery 5, and supply it to the low-voltage battery 5. This makes it possible to charge the low-voltage battery 5 based on the power stored in the high-voltage battery 4.

[0018] When the traveling motor M is driven based on the electric power of the high voltage battery 4, the electric power from the high voltage battery 4 is transmitted to the inverter 91, and the inverter 91 supplies electric power to the traveling motor M.

[0019] FIG. 2 shows a circuit diagram of the AC line filter 1. The AC line filter 1 includes a coil unit 10 and a capacitor unit 20. In this embodiment, the AC line filter 1 is provided for five power supply lines 30. These five power supply lines 30 are made up of a U-phase input line 31, a V-phase input line 32, a W-phase input line 33, a neutral line 34, and an output line 35. The coil unit 10 is connected in series to each of the five power supply lines 30. The capacitor unit 20 is provided across two of the five power supply lines 30.

[0020] The coil section 10 in this embodiment includes a first coil section 11 and a second coil section 12. The first coil section 11 and the second coil section 12 each have five coils L1, L2, L3, L4, and L5.

[0021] The U-phase input line 31 is provided with the coil L1 of the first coil section 11 and the coil L1 of the second coil section 12, connected in series. The V-phase input line 32 is provided with the coil L2 of the first coil section 11 and the coil L2 of the second coil section 12, connected in series. The W-phase input line 33 is provided with the coil L3 of the first coil section 11 and the coil L3 of the second coil section 12, connected in series. The neutral line 34 is provided with the coil L5 of the first coil section 11 and the coil L5 of the second coil section 12, connected in series. The output line 35 is provided with the coil L4 of the first coil section 11 and the coil L4 of the second coil section 12, connected in series.

[0022] Moreover, the capacitor section 20 in this embodiment includes a first X capacitor 21, a second X capacitor 22, a first Y capacitor 23, and a second Y capacitor 24. The first X capacitor 21 and the second X capacitor 22 have capacitors C1, C2, and C3, and the first Y capacitor 23 and the second Y capacitor 24 have capacitors C4, C5, and C6.

[0023] Capacitor C1 of the first X capacitor 21 is provided across the U-phase input line 31 and the V-phase input line 32. Capacitor C2 of the first X capacitor 21 is provided across the V-phase input line 32 and the W-phase input line 33. Capacitor C3 of the first X capacitor 21 is provided across the W-phase input line 33 and the U-phase input line 31.

[0024] Capacitor C4 of the first Y capacitor 23 is provided across the U-phase input line 31 and the neutral line 34. Capacitor C5 of the first Y capacitor 23 is provided across the V-phase input line 32 and the neutral line 34. Capacitor C6 of the first Y capacitor 23 is provided across the W-phase input line 33 and the neutral line 34.

[0025] Capacitor C4 of second Y capacitor 24 is provided across U-phase input line 31 and neutral line 34. Capacitor C5 of second Y capacitor 24 is provided across V-phase input line 32 and neutral line 34. Capacitor C6 of second Y capacitor 24 is provided across W-phase input line 33 and neutral line 34.

[0026] Capacitor C1 of the second X capacitor 22 is provided across the U-phase input line 31 and the V-phase input line 32. Capacitor C2 of the second X capacitor 22 is provided across the V-phase input line 32 and the W-phase input line 33. Capacitor C3 of the second X capacitor 22 is provided across the W-phase input line 33 and the U-phase input line 31.

[0027] On the power supply line 30, from the input / output unit 90 side, a first X capacitor 21, a first Y capacitor 23, a first coil unit 11, a second Y capacitor 24, a second coil unit 12, and a second X capacitor 22 are provided in this order.

[0028] When power is supplied to the power supply module 42 via the input / output unit 90, the power is supplied in single phase or three phases by the switching unit 41, and the coils L1, L2, L3, and L5 generate heat depending on the value of the current flowing through each input phase. Also, when the power supply module 42 outputs AC power generated from the power stored in the high-voltage battery 4 to the outside from the input / output unit 90, the coils L4 and L5 generate heat depending on the value of the current flowing through each output phase.

[0029] Therefore, the coil section 10 can be divided into a heat-generating section 51, which generates heat in response to the current flowing through it at a predetermined value or more, and a non-heat-generating section 52, which generates heat in an amount less than the predetermined value. Specifically, the heat-generating section 51 corresponds to the coils L1 and L5 of the first coil section 11 and the coils L1 and L5 of the second coil section 12, and the non-heat-generating section 52 corresponds to the coils L2, L3, and L4 of the first coil section 11 and the coils L2, L3, and L4 of the second coil section 12.

[0030] As described above, when the first coil section 11 and the second coil section 12 are each configured using a toroidal common mode choke coil, five windings are wound around one toroidal core. In this case, the first coil section 11 and the second coil section 12 are configured so that the coils L1 and L5 are adjacent to each other along the circumferential direction of the toroidal core, and the coils L1 and L5 have the same winding ratio and the same winding polarity (winding direction). In addition, coils L2, L3, and L4 are provided in the remaining part of the toroidal core after the part where coils L1 and L5 are provided.

[0031] Fig. 3 is a plan view of the substrate 2 on which the AC line filter 1 is provided. As shown in Fig. 3, the non-heat-generating portions 52 of the first coil section 11 are arranged closer to the first X capacitor 21, the second X capacitor 22, the first Y capacitor 23, and the second Y capacitor 24 than the heat-generating portions 51 of the first coil section 11. Furthermore, the non-heat-generating portions 52 of the second coil section 12 are arranged closer to the first X capacitor 21, the second X capacitor 22, the first Y capacitor 23, and the second Y capacitor 24 than the heat-generating portions 51 of the second coil section 12. This makes it possible to suppress the transfer of heat from the heat-generating portions 51 of the coil section 10 to the capacitor section 20, thereby suppressing a decrease in the capacitance of the capacitor section 20.

[0032] 3, at least a non-heat-generating portion 52 is disposed between the heat-generating portion 51 included in the first coil portion 11 and the heat-generating portion 51 included in the second coil portion 12. In this embodiment, the first coil portion 11 and the second coil portion 12 are configured to have a circular shape in a plan view, and the portion of the first coil portion 11 that constitutes the heat-generating portion 51 and the portion of the second coil portion 12 that constitutes the heat-generating portion 51 are each defined by an arc portion 81 in the circular shape of the first coil portion 11 and the second coil portion 12 and a straight portion 82 connecting both ends of the arc portion 81. The first coil portion 11 and the second coil portion 12 are arranged such that the two straight portions 82 that define the respective heat-generating portions 51 are non-parallel to each other. In particular, the heat generating portions 51 of the first coil portion 11 and the second coil portion 12 are provided so that the two straight line portions 82 intersect closer to the outer edge 2A of the substrate 2, on the side opposite the capacitor portion 20, than the center O1 of the first coil portion 11 and the center O2 of the second coil portion 12. In other words, the two straight line portions 82 are provided in a V-shape so that the intersection of the two straight line portions 82 is formed closer to the outer edge 2A of the substrate 2, on the side farther away from the capacitor portion 20, than the center O1 of the first coil portion 11 and the center O2 of the second coil portion 12 of the substrate 2.

[0033] Therefore, a non-heat generating portion 52 included in the first coil portion 11 and a non-heat generating portion 52 included in the second coil portion 12 are arranged between the heat generating portion 51 included in the first coil portion 11 and the heat generating portion 51 included in the second coil portion 12. By arranging the heat generating portion 51 on the outer edge portion 2A side of the substrate 2 in this manner, the heat generating portion 51 can easily dissipate heat, and by separating the heat generating portion 51 and the capacitor portion 20, it is possible to suppress heat transfer to the capacitor portion 20.

[0034] 3, the path through which a current flows in the substrate 2 is shown as current path I. As described above, the coil section 10 and the capacitor section 20 are provided on the power supply line 30 in the following order: first X capacitor 21, first Y capacitor 23, first coil section 11, second Y capacitor 24, second coil section 12, and second X capacitor 22. As shown by current path I in FIG. 3, the first X capacitor 21, first Y capacitor 23, first coil section 11, second Y capacitor 24, second coil section 12, and second X capacitor 22 are arranged in a non-linear fashion as three consecutive capacitors on the power supply line 30. In this way, the AC line filter 1 has three consecutive capacitors out of the first X capacitor 21, the first Y capacitor 23, the first coil section 11, the second Y capacitor 24, the second coil section 12, and the second X capacitor 22 arranged in a non-linear manner, which allows the heat generating section 51 to be positioned on the outer edge section 2A side of the substrate 2 and makes it easy to position the non-heat generating section 52 between the heat generating section 51 and the capacitor section 20.

[0035] The substrate 2 is disposed facing the cooling plate 60 via components (for example, the coil section 10 and the capacitor section 20) mounted on the substrate 2 (see FIG. 6). The cooling plate 60 has flow paths 61 therein through which a cooling fluid flows. FIG. 4 is a diagram showing the flow paths 61 of such a cooling plate 60. The cooling fluid is cooling water such as long-life coolant (LLC), insulating oil such as paraffin, or a refrigerant such as hydrofluorocarbon (HFC) or hydrofluoroolefin (HFO).

[0036] As shown in FIG. 4, a cooling fluid flows into the flow path 61 of the cooling plate 60 from an inlet 61A. The cooling plate 60 has a first portion 60A, a second portion 60B, and a third portion 60C formed in series. The flow path 61 is formed so that the cooling fluid flows through the first portion 60A, the second portion 60B, and the third portion 60C in this order. The first portion 60A extends in the longitudinal direction of the substrate 2 in the outer edge region OR of the substrate 2, is bent back from the extended end, curved, and further bent back from the bent end in the longitudinal direction of the substrate 2. The second portion 60B extends from the end of the first portion 60A in the longitudinal direction of the substrate 2 in a central region IR closer to the center than the outer edge region OR of the substrate 2, and is bent back. The third portion 60C extends from the second portion 60B in the longitudinal direction of the substrate 2 in the central region IR of the substrate 2. An outlet 61B is provided at the end of the third portion 60C.

[0037] 5 shows the positional relationship between flow path 61 of cooling plate 60 and first coil section 11, second coil section 12, first X condenser 21, second X condenser 22, first Y condenser 23, and second Y condenser 24. As shown in FIG.

[0038] 5, heat generating portion 51 included in first coil portion 11 and heat generating portion 51 included in second coil portion 12 are provided at positions that at least partially overlap with first portion 60A in plan view. Furthermore, non-heat generating portion 52 included in first coil portion 11 and non-heat generating portion 52 included in second coil portion 12 are provided at positions that at least partially overlap with second portion 60B in plan view. Furthermore, condenser portion 20 is provided at a position that at least partially overlaps with third portion 60C or partition wall 61C that partitions flow path 61 in plan view.

[0039] Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 3. In the following description, for ease of understanding, the direction parallel to the thickness direction of the substrate 2 will be referred to as the first direction.

[0040] 6, the coil portion 10 is mounted on the substrate 2 with a surface 10A on one side in the first direction facing the substrate 2. As shown in FIG. 6, if the coil portion 10 is a lead component, the coil portion 10 is welded (for example, soldered) by inserting a terminal 10C into a through-hole 2T in the substrate 2. If the coil portion 10 is a surface-mount component, the electrode of the coil portion 10 may be welded to a land on the substrate 2.

[0041] Furthermore, the coil section 10 is provided such that the surface 10B on the other side in the first direction can directly exchange heat with the cooling plate 60. As described above, the cooling plate 60 has a flow path 61 formed therein, and a cooling fluid flows through this flow path 61. A state in which direct heat exchange is possible means that the coil section 10 and the cooling plate 60 are not spaced apart, but are in direct contact with each other, or are in contact with each other via an object capable of heat transfer. In this embodiment, the surface 10B of the coil section 10 is provided so as to be in contact with the cooling plate 60 via a heat transfer sheet 98. This allows heat from the coil section 10 to be transferred to the cooling plate 60 via the heat transfer sheet 98.

[0042] Capacitor section 20 is mounted on substrate 2 with surface 20A on one side in the first direction facing substrate 2. As shown in Fig. 6, if capacitor section 20 is a lead component, terminals 20C of capacitor section 20 are inserted into through holes 2T of substrate 2 and welded (for example, solder-welded). If capacitor section 20 is a surface-mount component, electrodes of capacitor section 20 may be welded to lands on substrate 2.

[0043] Furthermore, the condenser unit 20 is provided with its other surface 20B on the other side in the first direction thermally separated from the cooling plate 60. That is, the condenser unit 20 is provided with its other surface 20B not in direct contact with the cooling plate 60 but with a heat insulating layer (e.g., an air layer). Therefore, as shown in Fig. 6, the condenser unit 20 may be provided with its other surface 20B having an air layer with respect to the cooling plate 60, or may be provided with its other surface 20B in contact with the cooling plate 60 via a heat insulating material.

[0044] The substrate 2 is connected to the cooling plate 60 via a heat transfer section 65 provided between a coil mounting section 10R on which the coil section 10 is mounted and a capacitor mounting section 20R on which the capacitor section 20 is mounted. The coil mounting section 10R is the area on the substrate 2 on which the coil section 10 is mounted. The capacitor mounting section 20R is the area on the substrate 2 on which the capacitor section 20 is mounted.

[0045] In this embodiment, the heat transfer section 65 is configured as a columnar body standing from the cooling plate 60 toward the substrate 2. The substrate 2 is provided with a metal fastening section 70. A bolt 99 is inserted into the fastening section 70, and the substrate 2 is fastened and fixed to the columnar body by the bolt 99 inserted into the fastening section 70. The columnar body can be configured using a partition wall 61C that partitions the flow path 61 provided in the cooling plate 60.

[0046] Furthermore, in this embodiment, the heat transfer section 65 is provided across the substrate 2 and the cooling plate 60, at least partially around each of the coil section 10 and the capacitor section 20. As shown in Fig. 3, the substrate 2 is provided with a plurality of fastening sections 70. The substrate 2 is fastened to the heat transfer section 65 by inserting bolts 99 into the fastening sections 70.

[0047] Returning to FIG. 6 , the heat-generating portion 51 of the coil portion 10 is provided in contact with the first portion 60A via the heat-transfer sheet 98. As a result, the amount of heat transferred from the heat-generating portion 51 of the coil portion 10 via the heat-transfer sheet 98 (indicated by arrow T2) is greater than the amount of heat transferred via the heat-transfer portion 65 (indicated by arrow T1). Here, as described above, the cooling fluid flows through the flow path 61 of the cooling plate 60 in the order of the first portion 60A, the second portion 60B, and the third portion 60C. Therefore, the cooling fluid introduced into the flow path 61 and having a low temperature flows through the first portion 60A. This makes it possible to cool the heat-generating portion 51 of the coil portion 10 with the cooling fluid.

[0048] The non-heat-generating portion 52 of the coil portion 10 is provided in contact with the second portion 60B via the heat transfer sheet 98. As a result, heat from the non-heat-generating portion 52 of the coil portion 10 is transferred to the cooling plate 60 along the arrow T3. Here, the cooling fluid that has undergone heat exchange in the first portion 60A flows through the second portion 60B of the cooling plate 60. Therefore, although the cooling fluid that flows through the second portion 60B has a higher temperature than the cooling fluid that flows through the first portion 60A, the non-heat-generating portion 52 of the coil portion 10 generates less heat than a predetermined value. Therefore, the non-heat-generating portion 52 of the coil portion 10 generates a relatively small amount of heat, and therefore can be sufficiently cooled by the cooling fluid that has flowed through the second portion 60B.

[0049] The capacitor unit 20 is disposed opposite the third portion 60C. As described above, the other surface 20B of the capacitor unit 20 is disposed apart from the cooling plate 60, and a heat transfer portion 65 is provided between the coil mounting portion 10R and the capacitor mounting portion 20R, spanning the substrate 2 and the cooling plate 60. In particular, the heat transfer portion 65 between the coil mounting portion 10R and the capacitor mounting portion 20R is provided from the third portion 60C of the cooling plate 60 toward the substrate 2. Therefore, as shown by arrow T4, heat from the capacitor unit 20 is transferred to the cooling plate 60 via the substrate 2 and the heat transfer portion 65, and the heat transfer portion 65 is cooled by the cooling fluid flowing through the third portion 60C.

[0050] This allows heat from the coil portion 10 to be released to the heat transfer portion 65 via the bolts 99 before being transferred to the capacitor portion 20. Therefore, it is possible to suppress a rise in temperature of the capacitor portion 20.

[0051] Other Embodiments Next, other embodiments of the AC line filter 1 will be described.

[0052] In the above embodiment, the coil unit 10 has been described as being formed by winding a wire around a single toroidal core to form the coils L1, L2, L3, L4, and L5. However, the coil unit 10 may include the coils L1, L2, L3, and L5, and the coil L4 may be formed separately.

[0053] In the above embodiment, the capacitor section 20 is described as being configured using a film capacitor. However, the capacitor section 20 can also be configured using other types of capacitors with excellent heat resistance (for example, ceramic capacitors).

[0054] In the above embodiment, the cooling plate 60 has been described as having the first portion 60A, the second portion 60B, and the third portion 60C formed continuously, and the flow path 61 of the cooling plate 60 formed so that the cooling fluid flows through the first portion 60A, the second portion 60B, and the third portion 60C in this order. The cooling plate 60 can also be formed by dividing it into more than three portions, the first portion 60A, the second portion 60B, and the third portion 60C, or by dividing it into two portions, for example, an upstream portion and a downstream portion.

[0055] In the above embodiment, the heat-generating portion 51 of the coil portion 10 is provided in contact with the first portion 60A of the cooling plate 60, the non-heat-generating portion 52 of the coil portion 10 is provided in contact with the second portion 60B of the cooling plate 60, and the capacitor portion 20 is provided facing the third portion 60C of the cooling plate 60. However, the heat-generating portion 51 of the coil portion 10 may be provided in contact with the second portion 60B of the cooling plate 60 or facing the third portion 60C of the cooling plate 60. The non-heat-generating portion 52 of the coil portion 10 may be provided in contact with the first portion 60A of the cooling plate 60 or facing the third portion 60C of the cooling plate 60. The capacitor portion 20 may be provided in contact with the first portion 60A of the cooling plate 60 or the second portion 60B of the cooling plate 60. The capacitor portion 20 may be provided in contact with the third portion 60C of the cooling plate 60.

[0056] In the above embodiment, the heat transfer section 65 has been described as being provided across the substrate 2 and the cooling plate 60 around at least a portion of the periphery of each of the coil section 10 and the capacitor section 20. However, the heat transfer section 65 may also be configured to be provided only between the coil mounting section 10R where the coil section 10 is mounted and the capacitor mounting section 20R where the capacitor section 20 is mounted, rather than being provided around each of the coil section 10 and the capacitor section 20.

[0057] In the above embodiment, the heat transfer unit 65 is a columnar body erected from the cooling plate 60 toward the substrate 2 side, and the substrate 2 is described as being fastened and fixed to the columnar body. However, the substrate 2 can also be fixed to a position on the cooling plate 60 other than the heat transfer unit 65. Also, instead of fastening and fixing the substrate 2 to the columnar body, it is also possible to configure the cooling plate 60 to have claws, for example, and to lock and fix the substrate 2 with these claws. Of course, it is also possible to configure the substrate 2 to be fixed in a way other than by locking with such claws.

[0058] In the above embodiment, the coil section 10 has been described as including the first coil section 11 and the second coil section 12, and the capacitor section 20 has been described as including the first X capacitor 21, the second X capacitor 22, the first Y capacitor 23, and the second Y capacitor 24. However, it is also possible for the coil section 10 to be composed of the first coil section 11, and the capacitor section 20 to be composed of the first X capacitor 21 and the first Y capacitor 23.

[0059] In the above embodiment, it has been described that the first X capacitor 21, the first Y capacitor 23, the first coil section 11, the second Y capacitor 24, the second coil section 12, and the second X capacitor 22 are provided in this order on the power supply line 30, and that the three consecutive capacitors are arranged non-linearly on the power supply line 30. However, when the first X capacitor 21, the first Y capacitor 23, the first coil section 11, the second Y capacitor 24, the second coil section 12, and the second X capacitor 22 are provided in this order on the power supply line 30, the three consecutive capacitors may be arranged linearly on the power supply line 30.

[0060] In the above embodiment, the AC line filter 1 has been described as being provided for five power supply lines 30. For example, if the power supply module 42 does not have the function of outputting AC power generated from power stored in the high-voltage battery 4 to the outside from the input / output unit 90, it is possible to configure the power supply module 42 with four power supply lines 30 without providing the output line 35. Furthermore, when AC power from a commercial power supply is input to the power supply module 42 in a single-phase two-wire system, the power supply lines 30 may be configured with a U-phase input line 31 and a neutral line 34. Furthermore, when AC power from a commercial power supply is input to the power supply module 42 in a single-phase three-wire system, the power supply lines 30 may be configured with a U-phase input line 31, a V-phase input line 32, and a neutral line 34.

[0061] [Summary of the above embodiment] The following provides an overview of the AC line filter 1 described above.

[0062] (1) The AC line filter 1 is an AC line filter 1 including a coil section 10 and a condenser section 20, in which the coil section 10 is mounted on a substrate 2 with a surface 10A on one side in a first direction facing the substrate 2 and a surface 10B on the other side in the first direction being capable of direct heat exchange with a cooling plate 60 through which a cooling fluid flows, the condenser section 20 is mounted on the substrate 2 with a surface 20A on one side in the first direction facing the substrate 2 and a surface 20B on the other side in the first direction being spaced apart from the cooling plate 60, and the substrate 2 is connected to the cooling plate 60 via a heat transfer section 65 provided between a coil mounting section 10R on which the coil section 10 is mounted and a capacitor mounting section 20R on which the condenser section 20 is mounted.

[0063] According to this configuration, heat generated by the coil portion 10 (winding) due to current flow is directly transferred from the other surface 10B of the coil portion 10 to the cooling plate 60, facilitating cooling of the coil portion 10. Furthermore, since the heat transfer portion 65 is provided between the coil portion 10 and the capacitor portion 20, heat from the coil portion 10 is less likely to be transferred to the capacitor portion 20. Therefore, even when common-mode noise occurs, a decrease in the capacitance of the capacitor portion 20 (the capacitor constituting the capacitor portion 20) can be suppressed. Furthermore, since heat from the coil portion 10 is directly transferred from the other surface 10B to the cooling plate 60 as described above, facilitating cooling of the coil portion 10, the distance between the coil portion 10 and the capacitor portion 20 can be shortened compared to a configuration in which heat from the coil portion 10 is not directly transferred from the other surface 10B to the cooling plate 60. Therefore, it is possible to suppress an increase in the size of the substrate 2.

[0064] (2) In the AC line filter 1 described in (1), it is preferable that the coil section 10 includes a heat-generating section 51 whose heat generation amount in response to the current flowing therethrough is equal to or greater than a predetermined value, and a non-heat-generating section 52 whose heat generation amount is less than the predetermined value, the cooling plate 60 has a first section 60A, a second section 60B, and a third section 60C formed in series, the flow path 61 of the cooling plate 60 is formed so that the cooling fluid flows through the first section 60A, the second section 60B, and the third section 60C in this order, the heat-generating section 51 is provided in contact with the first section 60A, the non-heat-generating section 52 is provided in contact with the second section 60B, and the capacitor section 20 is provided opposite the third section 60C.

[0065] According to this configuration, the temperature of the cooling fluid flowing through the flow path 61 of the cooling plate 60 is lowest in the first portion 60A, and becomes warmer in the second portion 60B and the third portion 60C in that order. Meanwhile, the temperatures of the coil portion 10 and the condenser portion 20 decrease in the order of the heat-generating portion 51 of the coil portion 10, the non-heat-generating portion 52 of the coil portion 10, and the condenser portion 20. Therefore, the coil portion 10 and the condenser portion 20 can be provided with higher cooling capacity as the heat generation amount increases, and it becomes possible to cool the coil portion 10 and the condenser portion 20 according to the heat generation amount.

[0066] (3) In the AC line filter 1 described in (1) or (2), it is preferable that the heat transfer section 65 is provided around at least a portion of the periphery of each of the coil section 10 and the capacitor section 20, spanning the substrate 2 and the cooling plate 60.

[0067] According to this configuration, heat from each of the coil section 10 and the condenser section 20 can be transferred to the cooling plate 60 via the heat transfer section 65. Therefore, it is possible to suppress heat transfer between the coil section 10 and the condenser section 20 that are separated from each other.

[0068] (4) In the AC line filter 1 described in (3), the heat transfer portion 65 is preferably a columnar body erected from the cooling plate 60 toward the substrate 2, and the substrate 2 is preferably fastened and fixed to the columnar body.

[0069] This configuration allows the heat transfer section 65 to be used in combination with the fasteners (bolts 99) that secure the substrate 2 to the cooling plate 60. This makes it possible to reduce the size of the AC line filter 1 compared to when the heat transfer section 65 and the fasteners are provided separately. Furthermore, the cooling efficiency can be improved via the columnar body and the fasteners (bolts 99). [Industrial Applicability]

[0070] The technology according to the present disclosure can be used in an AC line filter configured to include a coil section and a capacitor section. [Explanation of symbols]

[0071] 1: AC line filter, 2: circuit board, 10: coil section, 10A: surface, 10B: surface, 10R: coil mounting section, 20: capacitor section, 20A: surface, 20B: surface, 20R: capacitor mounting section, 51: heat generating section, 52: non-heat generating section, 60: cooling plate, 60A: first section, 60B: second section, 60C: third section, 61: flow path, 65: heat transfer section

Claims

1. An AC line filter including a coil section and a capacitor section, the coil portion is mounted on the substrate with one surface in a first direction facing the substrate, and the other surface in the first direction is provided in a state capable of directly exchanging heat with a cooling plate through which a cooling fluid flows; the capacitor unit is mounted on the substrate with one surface thereof in the first direction facing the substrate, and the other surface thereof in the first direction being spaced apart from the cooling plate; the substrate is connected to the cooling plate via a heat transfer section provided between a coil mounting section on which the coil section is mounted and a capacitor mounting section on which the capacitor section is mounted.

2. the coil portion includes a heat-generating portion having a heat generation amount equal to or greater than a predetermined value in response to a current flowing therethrough, and a non-heat-generating portion having a heat generation amount less than the predetermined value, the cooling plate is formed by a first portion, a second portion, and a third portion being continuously formed; the flow path of the cooling plate is formed so that the cooling fluid flows through the first portion, the second portion, and the third portion in this order; the heat generating portion is provided in contact with the first portion, the non-heat generating portion is provided in contact with the second portion, 2. The AC line filter according to claim 1, wherein the capacitor section is provided opposite the third portion.

3. 3. The AC line filter according to claim 1, wherein the heat transfer portion is provided around at least a portion of the periphery of each of the coil portion and the capacitor portion, spanning the substrate and the cooling plate.

4. the heat transfer portion is a columnar body extending from the cooling plate toward the substrate, 3. The AC line filter according to claim 1, wherein the substrate is fastened to the columnar body.

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