Ac line filter

Abstract

To provide an AC line filter which can suppress reduction in electrostatic capacity of a capacitor without increasing the size of a substrate.SOLUTION: An AC line filter 1 comprises a coil part 10 and a capacitor part 20. The coil part 10 includes: a heating part 51 whose heat generation amount in accordance with a flowing current is equal to or greater than a first set value; and a non-heating part 52 whose heat generation amount is less than the first set value. The non-heating part 52 is disposed closer to the capacitor part 20 than the heating part 51.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] For example, when DC power is input to electrical equipment such as an inverter device or a DC / DC converter, a filter circuit is used to reduce noise contained in the DC power. Technology related to such a filter circuit is described, for example, in Patent Document 1, the source of which is shown below.

[0003] Patent Document 1 describes an electric compressor. The electric compressor includes an electric motor that drives a compression unit and an inverter device that drives the electric motor. The inverter device is provided with a filter circuit that reduces noise contained in DC power input to the inverter device from a power storage device. The filter circuit is configured with an LC resonant circuit having a common mode choke coil and a capacitor. The common mode choke coil and the capacitor generate heat when a current flows through them. To absorb this heat, a metal member is provided between the common mode choke coil and the capacitor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-180428 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, a filter circuit (corresponding to the "AC line filter" of the present application) includes a common mode choke coil (corresponding to the "coil section" of the present application) and a capacitor (corresponding to the "capacitor section" of the present application), and dissipates heat generated in response to current flow via a metal member. However, a filter circuit generally includes multiple common mode choke coils and multiple capacitors, and when considering common mode noise, not all of these 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 response to temperature. To prevent this decrease in capacitance, it is possible to place the common mode choke coil and the capacitor, which generate a relatively large amount of heat, at a distance from each other, but this would increase the size of the circuit board.

[0006] Therefore, there is a need for an AC line filter that can suppress the decrease in capacitance of the capacitor without increasing the size of the board. [Means for solving the problem]

[0007] A characteristic configuration of an AC line filter according to the present invention is that it is an AC line filter including a coil section and a capacitor section, wherein the coil section includes a heat-generating section whose heat generation amount in response to current flow is equal to or greater than a first set value, and a non-heat-generating section whose heat generation amount is less than the first set value, and the non-heat-generating section is located closer to the capacitor section than the heat-generating section.

[0008] With this characteristic configuration, the capacitor section, which is relatively sensitive to heat (the capacitance of the capacitor section decreases as the temperature rises), can be located away from the heat-generating section of the coil section (winding) that generates heat when current flows through it. This prevents heat from the heat-generating section of the coil section from being transferred to the capacitor section, allowing the AC line filter to maintain its desired characteristics. [Brief explanation of the drawings]

[0009] [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. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] 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.

[0012] 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).

[0013] 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.

[0014] 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).

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In this embodiment, two coil sections 10 are provided. Specifically, the coil section 10 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Therefore, the coil section 10 can be divided into a heat generating section 51 in which the amount of heat generated in response to the current flow is equal to or greater than a first set value, and a non-heat generating section 52 in which the amount of heat generated is less than the first set 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.

[0029] 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.

[0030] 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 are arranged closer to the capacitor section 20 than the heat-generating portions 51. That is, 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.

[0031] Capacitor section 20 can be divided into a capacitance decreasing section 61 in which the amount of capacitance decrease due to temperature rise is equal to or greater than a second set value, and a non-capacitance decreasing section 62 in which the amount of capacitance decrease due to temperature rise is less than the second set value. In this embodiment, capacitance decreasing section 61 corresponds to capacitors C4, C5, and C6 of first Y capacitor 23 and capacitors C4, C5, and C6 of second Y capacitor 24, and non-capacitance decreasing section 62 corresponds to capacitors C1, C2, and C3 of first X capacitor 21 and capacitors C1, C2, and C3 of second X capacitor 22.

[0032] When capacitor section 20 is divided into capacitance decreasing section 61 and non-capacitance decreasing section 62, non-heat-generating section 52 is disposed between heat-generating section 51 and capacitance decreasing section 61. Specifically, non-heat-generating section 52 of first coil section 11 is disposed between heat-generating section 51 of first coil section 11 and first Y capacitor 23, and non-heat-generating section 52 of second coil section 12 is disposed between heat-generating section 51 of second coil section 12 and second Y capacitor 24. This suppresses heat transfer from heat-generating section 51 of coil section 10 to first Y capacitor 23 and second Y capacitor 24, thereby suppressing a decrease in the capacitance of capacitors C4, C5, and C6 of first Y capacitor 23 and second Y capacitor 24.

[0033] 3, at least a non-heat-generating portion 52 is disposed between a heat-generating portion 51 included in a first coil portion 11 serving as a first coil portion 10 and a heat-generating portion 51 included in a second coil portion 12 serving as a second coil portion 10. 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 that constitutes the heat-generating portion 51 in the first coil portion 11 and the portion that constitutes the heat-generating portion 51 in the second coil portion 12 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.

[0034] 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.

[0035] Furthermore, a metal fastening portion 70 is provided in a region of the substrate 2 on which the coil portion 10 and the capacitor portion 20 are mounted, where at least one non-heat-generating portion 52 is located. A bolt is inserted into this fastening portion 70, and the substrate 2 is fastened and fixed by the bolt to a support member (not shown) provided on the back side of the substrate 2 (the back side of the surface on which the coil portion 10 and the capacitor portion 20 are mounted). This allows heat transferred from the heat-generating portion 51 to the non-heat-generating portion 52 to be dissipated to the support member via the bolt before being transferred to the capacitor portion 20. Furthermore, by using a cooling plate through which a cooling fluid flows as such a support member, for example, it is possible to cool the bolt to which heat has been transferred.

[0036] In particular, in this embodiment, metallic fastening parts 70 are provided not only in non-heat-generating parts 52 but also in the areas where heat-generating parts 51 and capacitor part 20 are arranged. This makes it possible to improve the cooling performance for cooling heat-generating parts 51 and capacitor part 20.

[0037] 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.

[0038] Other Embodiments Next, other embodiments of the AC line filter 1 will be described.

[0039] 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.

[0040] 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).

[0041] In the above embodiment, it has been described that the non-heat-generating portion 52 of the coil portion 10 is disposed between the heat-generating portion 51 of the coil portion 10 and the capacitance reduction portion 61 of the capacitor portion 20. However, the non-heat-generating portion 52 of the coil portion 10 does not have to be disposed between the heat-generating portion 51 of the coil portion 10 and the capacitance reduction portion 61 of the capacitor portion 20.

[0042] In the above embodiment, the AC line filter 1 has been described as including two coil units 10. However, the AC line filter 1 may also be configured to include three or more coil units 10, or may also be configured to include one coil unit 10.

[0043] In the above embodiment, it has been described that the metallic fastening portion 70 is provided in an area of the substrate 2 on which the coil portion 10 and the capacitor portion 20 are mounted, where at least one non-heat-generating portion 52 is located. However, the metallic fastening portion 70 may be provided in an area of the substrate 2 that is different from the area on which the non-heat-generating portion 52 is located.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] [Summary of the above embodiment] The following provides an overview of the AC line filter 1 described above.

[0048] (1) The AC line filter 1 is an AC line filter 1 including a coil section 10 and a capacitor section 20, and the coil section 10 includes a heat-generating section 51 whose heat generation amount according to the current passing therethrough is equal to or greater than a first set value, and a non-heat-generating section 52 whose heat generation amount is less than the first set value, and the non-heat-generating section 52 is arranged closer to the capacitor section 20 than the heat-generating section 51.

[0049] With this configuration, capacitor section 20, which is relatively susceptible to heat (capacitor section 20 whose capacitance decreases as the temperature rises), can be located away from heat-generating section 51 of coil section 10, which generates heat when current flows through it. This prevents heat from heat-generating section 51 of coil section 10 from being transferred to capacitor section 20, making it possible to maintain the desired characteristics of AC line filter 1.

[0050] (2) In the AC line filter 1 described in (1), the capacitor section 20 preferably includes a capacitance reduction section 61 whose capacitance reduction amount due to temperature rise is equal to or greater than a second set value, and a non-capacity reduction section 62 whose capacitance reduction amount is less than the second set value, and the non-heat generation section 52 is preferably disposed between the heat generation section 51 and the capacitance reduction section 61.

[0051] According to this configuration, capacitance reducing section 61 in capacitor section 20, whose capacitance decreases to or exceeds the second set value as the temperature increases, can be located away from heat generating section 51 in coil section 10, which generates heat when common mode noise is generated. This prevents heat from heat generating section 51 in coil section 10 from being transferred to capacitance reducing section 61 in capacitor section 20, making it possible to maintain the desired characteristics of AC line filter 1.

[0052] (3) In the AC line filter 1 described in (1) or (2), it is preferable that at least two coil sections 10 are provided, and at least one non-heat-generating section 52 is disposed between the heat-generating section 51 included in the first coil section 11 (first coil section 10) and the heat-generating section 51 included in the second coil section 12 (second coil section 10).

[0053] According to this configuration, the heat generating portion 51 in the first coil portion 11 and the heat generating portion 51 in the second coil portion 12 can be provided at a distance from each other. This makes it possible to suppress heat transfer between the heat generating portion 51 in the first coil portion 11 and the heat generating portion 51 in the second coil portion 12. Therefore, it is possible to prevent thermal runaway in the first coil portion 11 and the second coil portion 12.

[0054] (4) In the AC line filter 1 described in (3), it is preferable that a metal fastening portion 70 is provided in an area of the substrate 2 on which the coil portion 10 and the capacitor portion 20 are mounted, where at least one non-heat-generating portion 52 is located.

[0055] As described above, the non-heat-generating portion 52 of the coil portion 10 is provided between the heat-generating portion 51 of the coil portion 10 and the capacitor portion 20. Therefore, according to this configuration, it is possible to release heat from the heat-generating portion 51 of the coil portion 10 via the metal fastening portion 70 provided in the region where the non-heat-generating portion 52 of the coil portion 10 is located.

[0056] (5) In the AC line filter 1 described in any one of (1) to (4), the coil section 10 includes a first coil section 11 and a second coil section 12, the capacitor section 20 includes a first X capacitor 21, a second X capacitor 22, a first Y capacitor 23, and a second Y capacitor 24, and 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 on the power supply line 30 in this order, and it is preferable that three consecutive capacitors are arranged non-linearly on the power supply line 30.

[0057] According to this configuration, 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 each arranged in a non-linear fashion in three consecutive rows on power line 30, making it easier to separate components that generate a relatively large amount of heat from components that generate a relatively small amount of heat in AC line filter 1. This makes it possible to suppress heat transfer from components that generate a relatively large amount of heat to components that generate a relatively small amount of heat. [Industrial Applicability]

[0058] 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]

[0059] 1: AC line filter, 2: circuit board, 10: coil section, 11: first coil section, 12: second coil section, 20: capacitor section, 21: first X capacitor, 22: second X capacitor, 23: first Y capacitor, 24: second Y capacitor, 30: power line, 51: heat generating section, 52: non-heat generating section, 61: capacitance reduction section, 62: non-capacitance reduction section

Claims

1. An AC line filter including a coil section and a capacitor section, the coil portion includes a heat generating portion having a heat generation amount equal to or greater than a first set value according to a current flowing therethrough, and a non-heat generating portion having a heat generation amount less than the first set value; The non-heat generating portion of the AC line filter is disposed closer to the capacitor portion than the heat generating portion.

2. the capacitor unit includes a capacitance decrease unit in which a decrease in capacitance due to a temperature increase is equal to or greater than a second set value, and a capacitance non-decrease unit in which the decrease is less than the second set value, 2. The AC line filter according to claim 1, wherein the non-heat generating portion is disposed between the heat generating portion and the capacitance decreasing portion.

3. At least two of the coil portions are provided, 3. The AC line filter according to claim 1, wherein at least one non-heat-generating portion is disposed between the heat-generating portion included in the first coil portion and the heat-generating portion included in the second coil portion.

4. 4. The AC line filter according to claim 3, wherein a metal fastening part is provided in a region of a substrate on which the coil section and the capacitor section are mounted, in which the at least one non-heat-generating part is located.

5. the coil portion includes a first coil portion and a second coil portion, the capacitor unit includes a first X capacitor, a second X capacitor, a first Y capacitor, and a second Y capacitor; 3. The AC line filter according to claim 1, wherein the first X capacitor, the first Y capacitor, the first coil section, the second Y capacitor, the second coil section, and the second X capacitor are provided in this order on a power supply line, and three consecutive capacitors are arranged non-linearly on the power supply line.

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