JPH11330886A - Box-shaped noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box-shaped noise filter which is made resistant to vibration and impact in which parallel divided works in an assembling process can be attained, and cost can be reduced. SOLUTION: A choke coil is housed in a box-shaped case 1, and at least capacitors Cx and Cy are housed as electronic components connected with the choke oil. Thermal stands 5 and 6, which outside connection terminals 7-10 are fixed, are mounted on the case 1. The terminal stands 5 and 6 are provided with housing part 50 and 51 for housing the electronic components. An insulating plate is provided between plural rectangular line coils, and the insulating plate is provided with the housing parts of the electronic components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box-type noise filter for a large current such as a line filter used in electronic equipment, and more particularly to a noise filter incorporating electronic components such as an X capacitor and a Y capacitor for noise reduction. Related to the structure.

[0002]

2. Description of the Related Art Conventionally, a noise filter using a common mode choke coil generally includes a coil using a toroidal winding or a coil using a UU or UI type core as a choke coil, and a capacitor (X Capacitors, Y capacitors). Conventionally, an external connection terminal fixed to a terminal block and a capacitor are connected with the capacitor floating in a case, and the external connection terminal and an end of the choke coil are soldered. Japanese Utility Model Publication No. Sho 60-42509 discloses another example of the capacitor in which a capacitor is housed in a housing portion formed at the bottom of a case and a lead wire of the capacitor is connected to an external connection terminal. ing.

[0003]

As described above, in a structure in which a capacitor is floated and connected to an external connection terminal as described above, the capacitor and the like may shake due to vibration and impact, and electronic components such as the capacitor may be damaged. It is necessary to cast resin all over the case, which inevitably increases the weight of the box-shaped noise filter. Also, when the capacitor is floated and connected to the external connection terminal, or when the capacitor is housed in the housing portion at the bottom of the case as described in the above-mentioned publication, the work of housing and connecting the electronic components such as the capacitor and the choke coil is performed. All must be performed at one place, and handling and workability are poor.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a box-shaped noise filter which is resistant to vibration and impact, enables parallel division of work in an assembly process, improves workability and handleability, and reduces costs. The purpose is to provide.

[0005]

According to a first aspect of the present invention, a choke coil is housed in a box-shaped case, and at least a capacitor is housed as an electronic component connected to the choke coil. In a box-shaped noise filter having a terminal block to which an external connection terminal is fixed, a housing portion for the electronic component is provided on the terminal block.

As described above, by providing the receiving portion for the electronic component on the terminal block, the operation of setting the electronic component on the terminal block can be performed in a separate step from the connection operation with the choke coil. Fixing to the electronic parts and setting work of the electronic parts can be performed in parallel division of labor.
Handleability is improved and work efficiency is improved. Further, since the electronic component is housed in the housing, damage due to vibration and impact can be prevented.

According to a second aspect of the present invention, in the first aspect, an electronic component housed in the housing portion is connected to the external connection terminal.

[0008] By connecting the electronic component set in the electronic component accommodating portion of the terminal block to the external connection terminal, the connection between the terminal block and the electronic component is pre-assembled as one united component. In a combination with a case in which the choke coil is fixed, only the connection work between the external connection terminal and the coil end of the choke coil is required, and the work can be performed efficiently.

A third aspect of the present invention is characterized in that, in the first or second aspect, the accommodating portion of the electronic component is formed separately from the terminal block, and the accommodating portion is combined with the terminal block.

As described above, the housing for the electronic components and the terminal block are formed separately, so that the box-shaped noise filter that does not require the electronic components and the box-shaped noise filter that requires the electronic components can have the same terminal. The table can also be used, and economical achievement can be achieved.

According to a fourth aspect of the present invention, a choke coil is formed by combining a plurality of coils, an insulating plate for insulating between the coils, a bobbin for holding the coils, and a split type closed magnetic circuit core. In a box-shaped noise filter in which at least a capacitor is connected as a component and the choke coil and the electronic component are accommodated in the case, a housing portion for the electronic component is provided on the insulating plate.

As described above, by providing the accommodating portion for the electronic component on the insulating plate, the operation of setting the electronic component can be performed in a separate step in parallel with the operation of connecting to the external connection terminal fixed to the terminal block. Workability, handling efficiency is improved, and work efficiency is improved. Further, since the electronic component is housed in the housing, damage due to vibration and impact can be prevented.

According to a fifth aspect of the present invention, in the fourth aspect, the electronic component housed in the housing portion is connected to a coil end.

[0014] By connecting the electronic component set in the electronic component accommodating portion of the insulating plate to the coil end, the connection between the choke coil and the electronic component is pre-assembled as one united component. In the combination of the terminal block and the external connection terminal fixed to it and the choke coil fixed to the case, only the connection work between the external connection terminal and the coil end of the choke coil is required, and work is performed efficiently. be able to.

The invention according to claim 6 is characterized in that, in claim 4 or 5, the accommodating portion of the electronic component is formed separately from the insulating plate, and the accommodating portion is combined with the insulating plate.

As described above, the housing for the electronic components and the insulating plate are formed separately, so that the box-shaped noise filter that does not require the electronic components and the box-shaped noise filter that requires the electronic components have the same insulation. The board can also be used, and economy can be achieved.

[0017]

FIG. 1A is a perspective view showing an embodiment of a box-shaped noise filter according to the present invention, and FIG.
2A is a circuit diagram thereof, FIG. 2A is a perspective view of a terminal block of the present embodiment, FIG. 2B is a perspective view of a capacitor which is an electronic component to be housed, and FIG. FIG. 3 is an exploded perspective view showing a mounting structure of the terminal block.

In FIG. 1A, reference numeral 1 denotes a metal case, and the metal case 1 includes a lower case 3 and an upper case (not shown). Synthetic resin terminal blocks 5, 6 are fitted into cutouts 3a provided at the opening edges at both ends of the lower case 3, and each of the terminal blocks 5, 6 has two external connection terminals 7,
8 and the external connection terminals 9 and 10 are fixed. As shown in FIG. 1B, an X capacitor Cx and a Y capacitor Cy are attached between terminals 7 and 8, and an X capacitor Cx is connected between terminals 9 and 10.
A capacitor Cx is provided. L1 and L2 are inductors provided between the terminals 7 and 9 and between the terminals 8 and 10, respectively, and these are configured as choke coils 21A by the coils 11A and 12A wound on the toroidal core 15A, respectively. . In addition, a resistor R is provided between these terminals 9 and 10 as necessary for removing back electromotive force generated in the inductors L1 and L2 and discharging the capacitors Cx and Cy and removing noise when the power is off.

Reference numerals 50 and 51 denote box-shaped box-shaped housing portions for capacitors provided integrally with the terminal blocks 5 and 6, respectively. One of the housing portions 50 has an X capacitor Cx and a Y capacitor Cx.
y is accommodated, and an X capacitor Cx
And the resistor R are accommodated.

As shown in FIGS. 1A and 2A, the external connection terminals 7 to 10 attached to the terminal blocks 5 and 6, respectively, have lead wires 52 of an X capacitor Cx and a Y capacitor Cy, respectively. 53 is connected.

As shown in FIG. 2C, a ground terminal 54 is formed in the center of the cutout 3a of the lower case 3, and a groove 5a for fitting the ground terminal 54 is provided in the terminal block 5. As shown in (A), a common lead wire 55 of the two Y capacitors Cy is connected to the ground terminal 54 by soldering or welding.

According to this structure, the terminal blocks 5, 6 are provided with the accommodating portions 50, 51 for the capacitors Cx, Cy, which are electronic components, so that the capacitors Cx, Cy are connected to the terminal blocks 5, 6, respectively.
Can be performed in a separate step from the connection with the coils 11A and 12A constituting the choke coil 21A, and the fixing of the choke coil 21A to the case 1 and the setting of the capacitors Cx and Cy can be performed in parallel. It can be done by division of labor. Further, since the capacitors Cx, Cy and the like are housed in the housing sections 50 and 51, damage due to vibration and impact can be prevented. Further, the amount of the adhesive to be filled in the housing portions 50 and 51 can be reduced as compared with a case where a capacitor or the like is fixed to the bottom of the case.

Also, since the capacitors Cx and Cy housed in the housings 50 and 51 are connected to the external connection terminals 7 to 10, the capacitors Cx and Cy set in the housings 50 and 51 of the terminal blocks 5 and 6, respectively. Are connected to the external connection terminals 7 to 10 so that the terminal blocks 5 and 6 and the capacitors Cx and Cy are connected.
And the like can be assembled in advance as one coherent part. Therefore, the coils 11A, 12A
Are fixed to the case 1 and the terminal blocks 5 and 6, the external connection terminals 7 to 10 and the coils 11A and 12A
Only the connection work with the coil end part can be performed efficiently.

FIG. 3 shows another example of the terminal block according to the present invention. The receiving section 50 is formed separately from the terminal block 5, and a groove-shaped fitting portion 5b is formed in the terminal block 5, and the receiving section is formed. 50 is the fitting portion 5
The housing 50 is removably attached to the terminal block 5 by forming a convex fitting portion 50a to be fitted to the terminal b, and fitting these fitting portions 5b and 50a.

As described above, the housing 50 for the capacitors Cx and Cy and the terminal block 5 are formed separately, so that a box-shaped noise filter that does not require electronic components and a box-shaped noise filter that requires electronic components are provided. Can be shared by the same terminal block 5, and economy can be achieved.

FIG. 4 is an exploded perspective view showing another embodiment of the present invention, FIG. 5 (A) is an exploded perspective view of a choke coil, and FIG. 5 (B) is a cross-sectional view showing a combined structure of a bobbin element body. FIG. 6A is a perspective view of a coil assembly, FIG. 6B is a perspective view of an insulating plate used for the coil assembly, and FIG.
1 is a sectional view showing an end connection structure of FIG.

In this embodiment, the coils 11 and 12 are
A rectangular wire is used to make it possible to be used at a large current (20 A to 300 A) and to be compact, and the coil is wound so that the wire width in the radial direction of the coil is larger than the wire width in the core direction.

5A, reference numerals 13 and 14 denote U-shaped cores constituting a split type closed magnetic circuit, and reference numerals 15a and 15b denote bobbin element bodies which constitute the bobbin 15 of FIG. 32 and flanges 33 and 34. 17 is a cylindrical portion 31 (3) of the bobbin body 15a (15b).
2) an insulating plate having a hole 17a for fitting therein, and receiving parts 60 and 61 for electronic components provided at both ends;
Bolts, 19 are fastening hardware, and 20 is a nut. FIG.
As shown in (B), the housing portions 60 at both ends of the insulating plate 17,
61 is integrally formed in a box shape with a bottom.

As shown in FIG. 7, the end 11a of one of the coils 11 is formed by bending an obliquely lowered portion so that the wide surface of the coil 11 is directed upward and inclined. The coil end 11a is connected to a connection portion 7a having a wide surface facing upward and formed as an inclined surface.
And are connected by a screw 62 and a nut 67. The other coil end 11b is formed such that the wide surface of the coil 11 is upward and inclined by bending the obliquely raised portion, and the wide surface of the external connection terminal 9 is upward and inclined. The coil end 11b is aligned with the connection portion 9a, and the screw 63 and the nut 6
9. 64, 65 are the screws 62, 6
3 is a lug terminal fixed in advance to the capacitor C
x, Cy and the resistor R are connected to the external connection terminals 7 and 9 and the coil end 1.
1a and 11b are connected by soldering or welding. The ends 12a and 12b of the coil 12 and the external connection terminals 8 and 10 are similarly configured and connected in the same manner.

FIG. 8 is a diagram showing an assembling sequence in the present embodiment. As shown in FIG.
The coils 11 each formed in the shape of glasses on the cylindrical portion 31 of FIG.
And the hole 17a of the insulating plate 17 is
a, and the coil 12 is fitted to the tubular portion 32 of the other bobbin body 15b, and the bobbin body 15
8 (B) are fitted together as shown in FIG.
As shown in (C), the U-shaped cores 13 and 14 are inserted, and the U-shaped bolt 18 is further fitted into the grooves 35 and 36 on both sides of the U-shaped cores 13 and 14 from one bobbin element body 15a side. The screw portion at the tip of 18 is projected outward from the other bobbin element body 15b side, and a fastening metal fitting 19 is fitted into the hole 19a by being fitted to the U-shaped bolt 18, and a nut 20 is screwed into the U-shaped bolt 18. By tightening and tightening, the choke coil 2
Integrated as 1.

Next, as shown in FIG.
The capacitors Cx and Cy and the capacitor Cx and the resistor R are accommodated in 0 and 61, respectively, and the lead wires 52 and 53 of the capacitors Cx and Cy are connected to the lug terminals 64 or 65 by welding or soldering as shown in FIG. At the same time, the lead wire 66 of the resistor R is connected to the lug terminal 65 by welding or the like.

By such a process, as shown in FIG. 6A, the electronic component is connected to the choke coil 21.
One unit is composed.

Next, the unit constructed as described above is set on the bottom plate 3b of the lower case 3, and the screw 26 is inserted through the through hole 24 and screwed into the screw hole 22 of the flanges 33, 34. Fix it. Then, the terminal blocks 5 and 6 are fixed to the cutout 3a of the lower case 3, and the external connection terminals 7 to 10 are fixed to the coil ends 11a, 11b, 12a and 12b by nuts 67 and 68. Then, screw 2 into through hole 24 of upper case 2
6 is screwed into the screw holes 22 of the flange portions 33 and 34 and fixed. Also, the upper case 2 and the lower case 3 are fitted with the vertical pieces 2a of the upper case 2 into the openings of the lower case 3, and
Is inserted into the through hole 71 and screwed into the screw hole 72 of the vertical piece 2a to be fixed.

As described above, the capacitor C is provided on the insulating plate 17.
By providing the accommodating portions 60 and 61 for x and Cy, the operation of setting the capacitors Cx and Cy is performed in parallel with the operation of connecting the external connection terminals 7 to 10 fixed to the terminal blocks 5 and 6 in a separate process. It can be carried out. Also, a capacitor Cx,
Since Cy is accommodated in the accommodating portions 60 and 61, damage due to vibration and impact can be prevented.

Further, as in the present embodiment, the housing 6
The electronic components accommodated in the coil ends 11a, 1
1b, 12a, and 12b, respectively, so that the capacitors Cx, Cy, and the like can be connected to these ends in advance. Therefore, the connection between the choke coil 21 and the electronic component can be assembled in advance as one united component, and the terminal blocks 5, 6 and the external connection terminals 7 to 10 fixed thereto, and the choke fixed to the case 1 In the combination with the coil 21, the external connection terminals 7 to 10 and the coil end 11 of the choke coil 21 are used.
Only connection work with a, 11b, 12a, 12b is required,
Work can be performed efficiently.

In this embodiment, the bobbin 1
5, the upper and lower widths of the flanges 33 and 34 are matched with the distance between the bottom plate 3b and the top plate 2b of the metal case 1;
Since the bobbin 15 is screwed between the top plate 2b and the top plate 2b, it is possible to provide a box-shaped noise filter that is strong against vibration and has improved electrical reliability.

FIG. 6C shows that the housing portion 61 is
By fitting a concave (or convex) fitting portion 61a into a convex (or concave) fitting portion 17b provided at the end of the insulating plate 17, The housing 61 is combined with the insulating plate 17.

As described above, the housing 61 for electronic components and the insulating plate 17 are formed separately, so that a box-shaped noise filter that does not require electronic components and a box-shaped noise filter that requires electronic components are provided. The same insulating plate can also be used, and economical achievement can be achieved.

The present invention can also be configured as a three-phase type, in which the bobbin does not have two cylindrical portions,
It may be configured as having one cylindrical portion.
The coil may be drawn out to the same side of the case 1 so that one end is connected to the terminal 7 (or 9) and the other end is connected to 8 (or 10). Also,
The core may be a combination of a U-shaped core and an I-shaped core. Further, the upper case 2 may be configured as a substantially flat plate as a simple lid. The connection structures of the choke coils 21 and 21A, the external connection terminals 7 to 10, the capacitors Cx and Cy, and the resistance R can be variously changed.

[0040]

According to the first aspect, a choke coil is housed in a box-shaped case, at least a capacitor is housed as an electronic component connected to the choke coil, and an external connection terminal is provided in the case. In the box-shaped noise filter in which the fixed terminal block is attached, since the terminal block is provided with the accommodating portion for accommodating the electronic component, the operation of setting the electronic component on the terminal block is the connection operation with the choke coil. The fixing of the choke coil to the case and the setting of the electronic components can be performed in a parallel division of labor, thereby improving workability and handling and reducing costs. Further, since the electronic component is housed in the housing, damage due to vibration and impact can be prevented.
In addition, when the accommodating portion is filled with the adhesive for fixing electronic components, the amount of the filling can be reduced.

According to the second aspect, in the first aspect, since the electronic component housed in the housing portion is connected to the external connection terminal, the connection between the terminal block and the electronic component is pre-assembled as one united component. In a combination with a case in which the choke coil is fixed, only the connection work between the external connection terminal and the coil end of the choke coil is required, and the work can be performed efficiently.

According to the third aspect, in the first or second aspect, the accommodating portion for the electronic component is formed separately from the terminal block, and the accommodating portion is combined with the terminal block. The same terminal block can be used as both a simple box-shaped noise filter and a box-shaped noise filter requiring electronic components, thereby achieving economy.

According to the fourth aspect, a plurality of coils, an insulating plate for insulating between the coils, a bobbin for holding the coils, and a split-type closed magnetic circuit core are combined to form a choke coil, and the choke coil has an electronic component. In a box-shaped noise filter in which at least a capacitor is connected as a component and the choke coil and the electronic component are accommodated in the case, an accommodating portion for accommodating the electronic component is formed in the insulating plate. The setting operation can be performed in a separate step in parallel with the connection operation with the external connection terminal fixed to the terminal block, so that workability and handling can be improved, and cost can be reduced. Further, since the electronic component is housed in the housing, damage due to vibration and impact can be prevented.

According to the fifth aspect, in the fourth aspect, since the electronic component housed in the housing portion is connected to the coil end, the connection between the choke coil and the electronic component is pre-assembled as one united component. In the combination of the terminal block and the external connection terminal fixed to it and the choke coil fixed to the case, only the connection work between the external connection terminal and the coil end of the choke coil is required, and the efficiency is improved. Work can be done.

According to claim 6, in claim 4 or 5, the accommodating portion of the electronic component is formed separately from the insulating plate, and the accommodating portion is combined with the insulating plate. A simple box-shaped noise filter and a box-shaped noise filter requiring electronic components can be shared by the same insulating plate, so that economy can be achieved.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view showing an embodiment of a box-shaped noise filter according to the present invention, and FIG. 1B is a circuit diagram thereof.

FIG. 2A is a perspective view of a terminal block of the present embodiment,
(B) is a perspective view of a capacitor which is an electronic component to be housed,
(C) is an exploded perspective view showing the mounting structure of the terminal block of the present embodiment.

FIG. 3 is a perspective view showing another configuration example of the terminal block and the electronic component housing in the embodiment of FIG. 1;

FIG. 4 is an exploded perspective view showing another embodiment of the box-shaped noise filter according to the present invention.

FIG. 5A is an exploded perspective view of the coil assembly of FIG. 4;
(B) is a sectional view showing a combined structure of the bobbin element bodies.

6A is a perspective view of the coil assembly of the embodiment shown in FIGS. 4 and 5, FIG. 6B is a perspective view of an insulating plate used in the coil assembly, and FIG. It is a top view showing another example of composition of an insulating board and an accommodation part.

FIG. 7 is a sectional view showing an external connection terminal connection portion of the box-shaped noise filter according to the embodiment shown in FIGS. 4 and 5;

FIGS. 8A and 8B are manufacturing process diagrams of the box-shaped noise filter according to the embodiment of FIGS. 4 to 7;

[Description of References] 1: Case, 5, 6: Terminal block, 7 to 10: Terminal, 7a,
9a: connection part, 11, 11A, 12, 12A: coil,
11a, 11b, 12a, 12b: coil end, 13,
14: U-shaped core, 15: bobbin, 17: insulating plate, 2
1 :: choke coil, 50, 51, 60, 61: housing, Cx, Cy: capacitor, L1, L2: inductor, R: resistor

Claims (6)

[Claims] 1. A box-shaped case containing a choke coil and at least a capacitor as an electronic component connected to the choke coil.
A box-shaped noise filter comprising a terminal block to which an external connection terminal is fixed, wherein a housing portion for the electronic component is provided on the terminal block. 2. The box-shaped noise filter according to claim 1, wherein an electronic component housed in said housing portion is connected to said external connection terminal. 3. The box-shaped noise filter according to claim 1, wherein a housing for the electronic component is formed separately from the terminal block, and the housing is combined with the terminal block. 4. A choke coil comprising a plurality of coils, an insulating plate for insulating between the coils, a bobbin holding the coils, and a split-type closed magnetic circuit core, wherein at least a capacitor is provided as an electronic component in the choke coil. A box-shaped noise filter which is connected to and accommodates the choke coil and the electronic component in the case, wherein a housing for the electronic component is provided on the insulating plate. 5. The box-shaped noise filter according to claim 4, wherein an electronic component housed in said housing portion is connected to a coil end. 6. The box-shaped noise filter according to claim 4, wherein a housing portion for the electronic component is formed separately from the insulating plate, and the housing portion is combined with the insulating plate.