JP2014007696A - Noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise filter that compactly ensures definite performance by allowing a packaging area to be set without consideration of block capacitors and ensuring sufficient strength.SOLUTION: The noise filter includes: a coil 12; a plurality of terminal blocks 16a, 16b connected with at least a winding 14 of the coil 12; a plurality of block capacitors 18; a main substrate 20 mounted with at least the coil 12 and the terminal blocks 16a, 16b on one main surface; and a plurality of sub substrates 22A, 22B mounted with at least the block capacitors 18. The main substrate 20 is arranged horizontally, and the sub substrates 22A, 22B are arranged substantially perpendicularly to an opposite main surface 20b of the main substrate 20 and coupled to the main substrate 20.

Description

  The present invention relates to a noise filter that is inserted between a power supply and a load device and reduces noise propagated from the power supply to the load device and noise propagated from the load device to the power supply.

  Conventionally, a noise filter has been inserted between a load device such as an inverter device that drives a motor or the like and a power source in order to prevent noise from the load device serving as a noise generation source of conduction noise or radiation noise. (See Patent Documents 1 and 2).

  In such a noise filter, a coil, a capacitor, and their connection parts (terminals, etc.) are the main constituent elements. However, since the coil tends to be the largest in size, Patent Document 1 A coil is arranged in the center, connecting parts are arranged on both sides of the casing, and a capacitor is arranged in a gap between the coil and the connecting parts (see FIG. 3 of Patent Document 1).

  As the capacitor, a block capacitor in which a plurality of capacitor elements are combined into a block is used in order to prevent noise from being mixed and to facilitate mounting work. However, since the block capacitor is large and bulky, it is necessary to increase the area of the gap between the coil and the connection component, which increases the mounting area of the noise filter (the area of the bottom surface of the housing). Usually, the noise filter is often mounted on a distribution board or the like, and there is a request for reducing the mounting area (the area of the bottom surface of the housing), but this request cannot be met.

  Therefore, conventionally, as shown in FIG. 1 of Patent Document 1 and Patent Document 2, the mounting area of the noise filter is reduced by housing the block capacitor in a space between the bottom plate of the housing and the connection component. It has been proposed.

JP 2000-114905 A Japanese Patent No. 3672779

  However, there is a limit even if the block capacitor is accommodated in the above-described space (the space between the bottom plate of the casing and the connection component), and not all the necessary number of block capacitors can be accommodated. Of course, it may be possible to reduce the size by reducing the number of block capacitors, but there is a problem that the performance as a noise filter deteriorates. Therefore, in order to ensure a certain level of performance, there are cases where a block capacitor has to be arranged in the gap between the coil and the connecting component.

  For this reason, conventionally, the mounting area of the noise filter has to be determined by the number of block capacitors to be mounted.

  Therefore, it is conceivable to use the mounting board in three dimensions, but there is a concern about the strength because the size of one block capacitor is large and the number of block capacitors to be mounted is large.

  The present invention has been made in consideration of such problems, and it is possible to set the mounting area of the noise filter without considering the block capacitor, and it is possible to mount a coil, a connecting part, a block capacitor, etc. However, it is an object of the present invention to provide a noise filter that can sufficiently ensure strength and can be downsized while ensuring a certain level of performance.

[1] A noise filter according to the present invention includes a coil, a plurality of terminal blocks to which at least a coil winding is connected, a plurality of block capacitors, and at least the coil and the terminal block on one main surface. A main board and at least one or more sub-boards on which the block capacitors are mounted, the main board being disposed in a horizontal direction, and the sub-board being substantially perpendicular to the other main surface of the main board. Arranged and connected to the main board, and the wiring pattern of the main board and the wiring pattern of the sub board are electrically connected at a connecting portion between the main board and the sub board. The through-hole is formed in the connecting portion with the sub-board, the sub-board has a convex portion in the connecting portion with the main board, and the convex portion of the sub-board is Serial wherein the sub board to the main board by being inserted into the through hole of the main substrate are connected.

[2] In the present invention, it is preferable that a part of the convex portion of the sub substrate protrudes from 1 mm to 5 mm from one main surface of the main substrate.

[3] In the present invention, the main board has a wiring pattern formed over the through hole, and the sub board has a wiring pattern formed over the protrusion, and the sub board protrudes into the through hole of the main board. A conductive member for electrically connecting the wiring pattern of the main board and the wiring pattern of the sub board may be provided in the insertion portion of the part.

[4] In the present invention, a plurality of the sub-substrates may be provided, and the plurality of sub-substrates may be arranged so that their main surfaces are substantially parallel to each other.

[5] In the present invention, a plurality of the sub-substrates may be provided, and the plurality of sub-substrates may be arranged such that their main surfaces are not parallel to each other.

[6] In [4] or [5], an auxiliary substrate may be provided that is disposed between adjacent sub-substrates and connects the adjacent sub-substrates.

[7] In this case, the auxiliary board may be disposed in a direction substantially perpendicular to the other main surface of the main board and connected to the main board.

[8] In the present invention, at least the main board and the sub board may be accommodated, and at least the housing may be fitted with the sub board.

[9] In this case, the side plate of the housing has a notch in the fitting portion with the sub-board, and the sub-board has a convex portion in the fitting portion with the side plate of the housing, The sub-board may be fitted into the casing by inserting the convex portion of the sub-board into the notch of the side plate of the casing.

[10] In [8] or [9], the bottom plate of the housing may have a convex portion for preventing the sub-substrate from being displaced.

  According to the noise filter of the present invention, the mounting area of the noise filter can be set without considering the block capacitor, and sufficient strength is ensured even when a coil, a connection component, a block capacitor, or the like is mounted. Therefore, it is possible to achieve downsizing while ensuring a certain performance.

It is a perspective view which shows the noise filter which concerns on this Embodiment seeing from the bottom face side. It is a perspective view which shows the state which removed the block capacitor from the noise filter seeing from the bottom face side. It is a side view which shows the state (1st example) which has arrange | positioned two sub-board | substrates so that each main surface may become substantially mutually parallel, removing a block capacitor | condenser. It is sectional drawing which abbreviate | omits and partially shows the principal part of the noise filter which concerns on this Embodiment. It is a disassembled perspective view which abbreviate | omits and shows the state which isolate | separated the main board | substrate, the sub board | substrate, and the metal case. It is a schematic diagram which shows two line segments which projected one main surface of the 1st sub board | substrate and the 2nd sub board | substrate on the other main surface of the main board | substrate, and the centerline of a main board | substrate. It is a side view which shows the state (2nd example) which has arrange | positioned two sub-board | substrates so that each main surface may become substantially mutually parallel, removing a block capacitor. It is a side view which shows the state which has arrange | positioned two sub-board | substrates so that each main surface may become mutually non-parallel, removing a block capacitor | condenser. FIG. 9A is a side view showing an example in which an auxiliary board is connected between two sub-boards, and FIG. 9B is a bottom view thereof. FIG. 10A is a side view showing an example in which an auxiliary board is connected between two sub-boards and a main board, and FIG. 10B is a bottom view thereof. FIG. 5 is a perspective view showing a state in which a part of a sub-board is fitted and housed when the assembly is housed in a metal case. It is a perspective view which abbreviate | omits one part and shows the example which provided the convex part for preventing the position shift of a sub board | substrate to the baseplate of a housing | casing.

  Hereinafter, embodiments of the noise filter according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the noise filter 10 according to the present embodiment includes a first terminal block 16 a and a second terminal block 16 b (connection components) to which a coil 12 and at least a winding 14 of the coil 12 are connected. ), A plurality of block capacitors 18, a flat main board 20 on which at least the coil 12, the first terminal block 16 a and the second terminal block 16 b are mounted on one main surface, and at least the block capacitor 18 is mounted 1. The above-described flat sub-substrate 22 (in this embodiment, the first sub-substrate 22A and the second sub-substrate 22B) is included.

  The main board 20 is arranged in the horizontal direction. The sub board 22 is arranged in a direction substantially perpendicular to the other main surface of the main board 20 and is connected to the main board 20. The main board 20 and the sub board 22 are made of, for example, paper phenol, paper epoxy, glass composite, glass epoxy, or the like. Of course, a ceramic substrate may be used.

  As shown in FIGS. 4 and 5, the main board 20 has a through hole 24 at a connection portion between the first sub board 22 </ b> A and the second sub board 22 </ b> B, and the sub board 22 is connected to the main board 20. Convex portions 26 are provided at the connecting portions. Then, the convex portion 26 of the sub-board 22 is inserted into the through hole 24 of the main board 20 and fitted therein, so that the sub-board 22 is connected to the main board 20. In this case, the height of the portion (projecting portion) projecting from the through hole 24 of the main substrate 20 among the convex portions 26 of the sub-substrate 22, that is, the projecting amount da from one main surface of the main substrate 20 is 1 mm or more. It is preferable that it is 5 mm or less. If it is less than 1 mm, the locking and engagement of the projections 26 with the through holes 24 will be insufficient, and the sub-board 22 will be easily detached from the main board 20. If the protruding amount da exceeds 5 mm, there is a risk of short-circuiting due to contact with the winding 14 of the coil 12 or the like.

  Further, a wiring pattern 28 is formed on one main surface 20 a of the main board 20 over the through hole 24, and a wiring pattern 30 is formed on the sub-board 22 over the tip of the convex portion 26. A conductive layer 32 connected to the wiring pattern 28 is formed on the periphery (the periphery on the one main surface 20a side and the periphery on the other main surface 20b side) and the inner wall of the through hole 24 of the main substrate 20 so that the through hole connection can be made. It has become.

  A conductive member 34 (for example, electrically connecting the wiring pattern 28 of the main substrate 20 and the wiring pattern 30 of the sub substrate 22 to the insertion portion of the convex portion 26 of the sub substrate 22 into the through hole 24 of the main substrate 20. Solder, silver solder, conductive adhesive, etc.) are applied.

  Specifically, among the convex portions 26 of the sub-board 22, the wiring pattern 30 of the portion (projecting portion) protruding from the through hole 24 of the main substrate 20 and the wiring pattern 28 around the through hole 24 of the main substrate 20 are electrically connected. The conductive member 34 is applied so as to be connected. Since the applied conductive member 34 also wraps around the other main surface 20b side of the main board 20 through the gap between the convex portion 26 and the through hole 24, the wiring pattern 30 of the sub board 22 and the wiring pattern 28 of the main board 20 The electrical connection is made between the convex portion 26 of the sub-board 22 and one main surface 20a (around the through-hole 24) of the main board 20, between the convex portion 26 of the sub-board 22 and the through-hole 24 of the main board 20. This is performed between the sub-board 22 and the other main surface 20b (around the through hole 24) of the main board 20. When a conductive adhesive is used as the conductive member 34, the conductive member 34 has a certain degree of elasticity. Therefore, even if the convex portion 26 vibrates in the lateral direction or is displaced in the lateral direction, the conductive member 34 is reliably peeled off. In addition, the electrical connection between the sub-board 22 and the main board 20 can be reliably performed.

  The sub-board 22 has a through hole 38 through which the terminal 36 of the block capacitor 18 is inserted. Similarly to the through hole 24 of the main board 20, each through hole 38 is also formed with a conductive layer 40 connected to the wiring pattern 30 of the sub-board 22, and further, through the conductive member 34, through-hole connection can be made. It is like that.

  As shown in FIG. 1, six block capacitors 18 are mounted on the first sub-board 22A. Among the three block capacitors 18, one main surface 22Aa (second sub-board 22B) of the first sub-board 22A is mounted. The other three block capacitors 18 are mounted on the other main surface 22Ab of the first sub-board 22A. In this case, the terminals 36 of the three block capacitors 18 are mounted so as to be shifted from each other so as not to collide with the other three block capacitors 18. If the terminal 36 of the block capacitor 18 is long, it may be cut appropriately after mounting.

  Similarly, four block capacitors 18 are mounted on the second sub-board 22B, and two of the block capacitors 18 are one main surface 22Ba of the second sub-board 22B (a surface facing the first sub-board 22A). The other two block capacitors 18 are mounted on the other main surface 22Bb of the second sub-board 22B. Also in this case, the terminals 36 of the two block capacitors 18 are mounted so as to be shifted from each other so as not to collide with the other two block capacitors 18.

  As shown in FIG. 3, the angle θ1 formed between the other main surface 20b of the main substrate 20 and one main surface of the first sub-substrate 22A and the other main surface 20b of the main substrate 20 and one main surface of the second sub-substrate 22B. The angle θ2 formed with the surface is preferably 85 ° to 95 °. That is, the sub board 22 is arranged in a direction substantially perpendicular to the other main surface 20 b of the main board 20. If the angles θ1 and θ2 formed are smaller than 85 ° or larger than 95 °, the force that supports the main substrate 20 (force component in the direction toward the main substrate 20) is reduced, and the combination of the main substrate 20 and the sub substrate 22 is performed. The strength of the solid 42, for example, the strength that supports the plurality of block capacitors 18 may be insufficient. In addition, there is a possibility that a space where the block capacitor 18 is accommodated is locally narrowed, and a necessary number of block capacitors 18 cannot be mounted. On the other hand, if the angles θ1 and θ2 formed are 85 ° to 95 °, such inconvenience does not occur.

  In addition, as schematically shown in FIG. 6, a line segment obtained by projecting one main surface 22Aa of the first sub-board 22A onto the other main surface 20b of the main board 20 is defined as the first line L1 and the second sub-board 22B. A line segment obtained by projecting one main surface 22Ba onto the other main surface 20b of the main substrate 20 is defined as a second line segment L2, and extends toward the center line Lc (the first terminal block 16a and the second terminal block 16b) of the main substrate 20. When the angle formed by the center line (virtual line)) and the first line segment L1 is the first angle φ1, and the angle formed by the center line Lc and the second line segment L2 is the second angle φ2, the first angle φ1 And the second angle φ2 may be substantially the same or different from each other. Here, “substantially the same” means 0 ° ≦ | φ1−φ2 | ≦ 2 °, and one main surface 22Aa and 22Ba of each of the first sub-substrate 22A and the second sub-substrate 22B is substantially parallel to each other. It shows that. FIG. 3 and FIG. 7 show an example in which the first sub-board 22A and the second sub-board 22B are arranged so that the one main surfaces 22Aa and 22Ba are substantially parallel to each other. On the other hand, “different from each other” means that 2 ° <| φ1-φ2 | ≦ 90 °, and that one main surface 22Aa and 22Ba of each of the first sub-substrate 22A and the second sub-substrate 22B is not parallel to each other. Indicates. FIG. 8 shows an example in which the first sub-board 22A and the second sub-board 22B are arranged so that their main surfaces are not parallel to each other.

  9A and 9B, the auxiliary substrate 44 is disposed between the adjacent first sub-board 22A and second sub-board 22B, and connects the first sub-board 22A and the second sub-board 22B. You may make it have.

  In this case, through holes 46 are respectively provided in the connection portions of the first sub-board 22A and the second sub-board 22B with the auxiliary board 44, and among the auxiliary boards 44, the first sub-board 22A and the second sub-board 22B Each of the connecting portions is provided with a convex portion 48. And the convex part 48 of the auxiliary | assistant board | substrate 44 is inserted in each through-hole 46 of 22A of 1st sub-board | substrates, and the 2nd sub-board | substrate 22B, and is inserted, and 1st sub-board | substrate 22A and 2nd sub-board | substrates 22B assist. By being firmly connected via the substrate 44, the strength of the assembly 42 composed of the main substrate 20 and the sub substrate 22 is further improved. Also in this case, the height (protrusion amount db) of a portion (protruding portion) protruding from the through hole 46 of the first sub-substrate 22A and the second sub-substrate 22B in the convex portion 48 of the auxiliary substrate 44 is 1 mm or more and 5 mm. The following is preferable.

  Further, as shown in FIGS. 10A and 10B, the auxiliary substrate 44 may be disposed substantially perpendicular to the other main surface 20 b of the main substrate 20 and connected to the main substrate 20. In this case, similarly to the relationship between the main board 20 and the sub board 22, the angle between the other main surface 20b of the main board 20 and the main surface of the auxiliary board 44 is preferably 85 ° to 95 °.

  In addition, a through hole 50 is provided in a connection portion of the main substrate 20 with the auxiliary substrate 44, and a convex portion 52 is provided in a connection portion of the auxiliary substrate 44 with the main substrate 20. And the convex part 52 of the auxiliary board | substrate 44 is inserted in the through-hole 50 of the main board | substrate 20, and the main board | substrate 20 and the auxiliary | assistant board | substrate 44 are firmly connected by being inserted, Therefore, the main board | substrate 20 and the sub board | substrate 22 Thus, the strength of the assembly 42 is further improved. 9A to 10B, the auxiliary board 44 and the sub board 22 may be electrically connected similarly to the main board 20 and the sub board 22, or in FIGS. 10A and 10B, The auxiliary board 44 and the main board 20 may be electrically connected. This increases the degree of freedom in wiring design of each substrate, which is preferable.

  As shown in FIG. 11, the assembly 42 composed of the main board 20 and the sub board 22 (with the block capacitor 18 mounted) is accommodated in an internal space of a metal case 54 (housing) as a shield case. .

  In this case, it is preferable that a part of the sub-board 22 is fitted to the metal case 54 to accommodate the assembly 42. Specifically, as shown in FIG. 11, a notch 56 is provided in a fitting portion with the sub board 22 in the upper part of one side plate 54 a of the metal case 54, and the metal case 54 of the sub board 22 is formed. A convex portion 58 is provided at a fitting portion with one side plate 54a. Then, the convex portion 58 of the sub board 22 is inserted into the notch 56 of the one side plate 54a of the metal case 54, and the sub board 22 is fitted into the metal case 54, whereby the main board 20 is fitted. As a result, the assembly 42 of the sub-board 22 is positioned at a predetermined position in the metal case 54, and the assembly 42 is not displaced in the horizontal direction in the metal case 54. Since the notch 56 is formed only on one side plate 54a, the sub-board 22 can be easily assembled to the side plate of the metal case 54, and the working efficiency is improved. Of course, the notches 56 may be provided on the two side plates 54 a and 54 b of the metal case 54 facing each other, and the protrusions 58 may be provided on both sides of the sub-board 22.

  Further, as shown in FIG. 12, a convex portion 60 for preventing the displacement of the sub-board 22 may be provided on the bottom plate 54 c of the metal case 54. As shown in FIG. 12, the convex portion 60 may be formed by bending a part of the bottom plate 54c inward of the metal case 54 by bending a sheet metal. Although not shown, the bottom plate 54c is embossed. It may be formed by applying. Thereby, for example, when the noise filter 10 is attached to the distribution board, even if the main surface 20a of the main board 20 is installed so as to be along the vertical direction (the direction of gravity), the lower end of the sub board 22 is shifted in the vertical direction. This eliminates rattling and vibrations.

  In this case, for example, as shown in FIG. 12, it is a position close to one side plate 54a (indicated by a two-dot chain line) of the metal case 54 (a position spaced from the side plate 54a by about 1 mm to 1 cm), and A position facing one main surface of the sub-board 22, a position close to the other side plate 54 b of the metal case 54 (position separated from the other side plate 54 b by about 1 mm to 1 cm), and a position of the sub-board 22 It is preferable to form the convex part 60 in the position which opposes the other main surface, respectively. Assembling of the sub-board 22 to the bottom plate 54c of the metal case 54 is simple and the working efficiency is improved, and the occurrence of rattling and vibration can be further reduced.

  As described above, the noise filter 10 according to the present embodiment has a combination of the main board 20 and the sub board 22 below the coil 12, the first terminal block 16a, and the second terminal block 16b that have not been considered so far. It is possible to form a space in the space, and a plurality of block capacitors 18 can be accommodated using the space. As a result, the mounting area of the noise filter 10 can be set without considering the block capacitor 18, and the coil 12, the first terminal block 16a, the second terminal block 16b, the block capacitor 18 and the like are mounted. In addition, sufficient strength can be secured, and downsizing can be achieved while ensuring a certain level of performance.

  About the comparative example and the Example, the difference in size when one coil 12, the first terminal block 16a, the second terminal block 16b, and ten block capacitors 18 were mounted was confirmed. Table 1 below shows the dimensions (vertical x horizontal), the mounting area, and the ratio of the mounting area (the ratio of the example when the comparative example is 100%) of the comparative example and the example.

<Comparative example>
The block capacitor 18 is accommodated below each of the first terminal block 16a and the second terminal block 16b. In this case, only three block capacitors 18 can be accommodated in the space below the first terminal block 16a, and only two block capacitors 18 can be accommodated in the space below the second terminal block 16b. The area is set to be large, a clearance is secured between the first terminal block 16 a and the coil 12 so that the three block capacitors 18 can be mounted, and the two block capacitors 18 are interposed between the second terminal block 16 b and the coil 12. A gap that can be mounted was secured. As a result, as shown in Table 1 above, the vertical and horizontal dimensions were 140.0 mm × 77.0 mm, and the mounting area was 10780 mm ² .

<Example>
The configuration is the same as that of the noise filter 10 according to the embodiment, and among the ten block capacitors 18, six block capacitors 18 are mounted on the first sub-board 22A, and the remaining four block capacitors 18 are the first. 2 mounted on the sub-board 22B. In this case, it was not necessary to secure a gap for mounting the block capacitor 18 between the first terminal block 16a and the coil 12 and between the second terminal block 16b and the coil 12. As a result, as shown in Table 1 above, the vertical and horizontal dimensions were 128.0 mm × 62.5 mm, and the mounting area was 8000 mm ² . It was found that when the mounting area of the comparative example was 100%, the mounting area of the example was 74%, which was reduced by 26%.

  The noise filter according to the present invention is not limited to the above-described embodiment, and can of course have various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Noise filter 12 ... Coil 14 ... Winding 16a ... 1st terminal block 16b ... 2nd terminal block 18 ... Block capacitor 20 ... Main board 22 ... Sub board 22A ... 1st sub board 22B ... 2nd sub board 24, 38 , 46, 50 ... through holes 26, 48, 52, 58, 60 ... convex portions 28, 30 ... wiring patterns 32, 40 ... conductive layer 34 ... conductive member 36 ... terminal 42 ... assembly 44 ... auxiliary substrate 54 ... metal case 56 ... Notch

Claims (10)

A coil, a plurality of terminal blocks to which at least the windings of the coil are connected, a plurality of block capacitors, and a main board on which at least the coil and the terminal block are mounted on one main surface;
And at least one sub-board on which the block capacitor is mounted,
The main board is arranged in a horizontal direction,
The sub-board is disposed in a direction substantially perpendicular to the other main surface of the main board, and is connected to the main board,
In the connecting portion between the main board and the sub board, the wiring pattern of the main board and the wiring pattern of the sub board are electrically connected,
The main board has a through hole in a connecting portion with the sub board,
The sub-board has a convex portion at a connection portion with the main board,
The noise filter, wherein the sub-board is connected to the main board by inserting the convex portion of the sub-board into the through hole of the main board. The noise filter according to claim 1.
A noise filter, wherein a part of the convex portion of the sub substrate protrudes from 1 mm to 5 mm from one main surface of the main substrate. The noise filter according to claim 1 or 2,
The main board has a wiring pattern formed over the through hole,
The sub-substrate has a wiring pattern formed on the convex portion,
A noise filter comprising a conductive member that electrically connects the wiring pattern of the main board and the wiring pattern of the sub board at a portion where the convex part of the sub board is inserted into the through hole of the main board. . In the noise filter of any one of Claims 1-3,
A plurality of the sub-boards;
The noise filter, wherein the plurality of sub-boards are arranged so that their main surfaces are substantially parallel to each other. In the noise filter of any one of Claims 1-3,
A plurality of the sub-boards;
The plurality of sub-boards are arranged so that their main surfaces are not parallel to each other. The noise filter according to claim 4 or 5,
A noise filter comprising an auxiliary substrate that is disposed between adjacent sub-substrates and that connects the adjacent sub-substrates. The noise filter according to claim 6.
The noise filter according to claim 1, wherein the auxiliary substrate is disposed substantially perpendicular to the other main surface of the main substrate and is connected to the main substrate. In the noise filter of any one of Claims 1-7,
A noise filter comprising: a housing that accommodates at least the main board and the sub board and is fitted with at least the sub board. The noise filter according to claim 8.
The side plate of the housing has a notch in the fitting portion with the sub-board,
The sub-board has a convex portion in a fitting portion with the side plate of the housing,
The noise filter, wherein the sub-board is fitted into the housing by inserting the convex portion of the sub-board into the notch of the side plate of the housing. The noise filter according to claim 8 or 9,
The noise filter according to claim 1, further comprising: a protrusion on the bottom plate of the housing for preventing displacement of the sub-board.

Images