JP2007288710A - Noise filter and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and easily assemble and manufacture a noise filter with a little man-hour. <P>SOLUTION: In a case body 12, an AC input terminal base 18 and an AC output terminal base 20 are integrally formed at both sides of a case bottom plate with a metal bottom plate 15 disposed on a rear side, a substrate supporting wall 36 is integrally raised between the terminal bases, and a connecting pin 34 is protruded internally upward from the terminal base. At the same time, a connecting pin 38 is protruded from a top end of a connection metal fitting 40 connected to a ground terminal 25 provided at a side of the case bottom plate, and top ends of the connecting pins 34, 38 extend to a substrate arrangement position. A circuit board 28 with circuit components mounted thereon is integrated and disposed at a position abutted on the substrate supporting wall 36 while turning a component mounted face toward the case body 12, soldered on a substrate rear side exposed externally in a state where the connecting pins 34, 38 extending from a side of the terminal bases and the ground terminal are inserted into holes, and electrically and mechanically connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a noise filter and a manufacturing method for removing noise entering an electronic device or the like via a power line or the like, and more particularly to a noise filter and a manufacturing method characterized by having a structure that facilitates assembly.

  Conventionally, a noise filter composed of a coil and a capacitor is a device that prevents an electronic device from malfunctioning due to noise entering the electronic device from the outside via a power supply line, a communication line, etc., and is necessary for the electronic device It is essential.

  Conventionally, as this type of noise filter, an AC input terminal block 118 and an AC output terminal block 120 are provided on a case body 112 and a cover 114 is mounted on the upper portion as shown in the external view of FIG. .

  As shown in the circuit diagram of FIG. 10, the noise filter 100 is formed by winding a conductive wire around a toroidal core as a component of the noise filter between the AC input terminals 18a and 18b and the AC output terminals 20a and 20b. Common mode choke coil 22 for attenuating common mode noise and an X capacitor (across the circuit) connected between the input side and output side lines of common mode choke coil 22 for attenuating low-frequency normal mode noise. A line capacitor) 24 and a Y capacitor (line bypass capacitor) 26 connected between the line and ground in order to attenuate high-frequency common mode noise and normal mode noise.

  FIG. 9 is an explanatory view showing the internal structure by removing the cover 114 of FIG. 8 and breaking the front wall portion of the case body 112. The noise filter 100 includes an AC input terminal block 118 and an AC output terminal block 120. The common mode choke coil 22, the X capacitor 24, and the Y capacitor 26 are inserted and assembled in the case main body 112, and the common mode choke coil 22 is connected by the crimping claws 130 a of the terminal fitting 130 embedded in the AC input terminal block 118. The terminal 22a and the lead terminal of the X capacitor 24 are simultaneously crimped and electrically connected to the terminal fitting 130.

  Further, in the crimping claws 130a of the terminal fitting 130 embedded in the AC output terminal block 120, the connection terminal 22a of the common mode choke coil 22, the lead terminal of the X capacitor, and one lead terminal 26a of the Y capacitor 26 are caulked at the same time. 130 is electrically connected.

  In FIG. 9, the lead terminal of the X capacitor 24, one lead terminal 26a of the Y capacitor 26, and the connection terminal 22a of the common mode choke coil 22 are located at predetermined positions. It shows the open state before tightening.

Further, the other lead terminal 26 b of the Y capacitor 26 is wound or caulked around the connection fitting 140 rising from the metal bottom plate 115 disposed on the back surface of the case main body 112. The ground terminal 25 is formed integrally with the metal bottom plate 115.
JP 2005-1981147 A

  However, in such a conventional noise filter, at the time of caulking work or winding work, the X capacitor 24, the common mode choke coil 22, and the Y capacitor 26 are assembled to the case body 112 and then the lead terminals of the capacitors. Must be deformed and positioned at a predetermined location, which is difficult to work.

  Further, even if the lead terminals of the capacitors are deformed into a predetermined shape in advance, there may be a problem in alignment or deformation of the lead terminals when the capacitors are assembled to the case body 112. At this time, if it is difficult to reshape the lead terminal in the assembled state, each capacitor and the common mode choke coil 22 must be pulled out of the case body 112 and reworked.

  Furthermore, there is a problem that a complicated process and a large number of man-hours are required when assembling the noise filter, such as a process of fixing each capacitor or common mode choke coil to the case body, for example, application of an adhesive.

An object of this invention is to provide the noise filter and manufacturing method which can be assembled and manufactured simply and easily with few man-hours.

  The present invention provides a noise filter. In the noise filter of the present invention, an AC input terminal block and an AC output terminal block are integrally formed on both sides of a case bottom plate having a metal bottom plate disposed on the back surface, and a substrate support wall is erected integrally between the terminal blocks. A case body with a connection pin protruding from the inside upward and a connection pin protruding from the tip of the connection fitting connected to the ground terminal provided on the case bottom plate side, and the tip of each connection pin extending to the board placement position, and common mode Place the choke coil, X capacitor, and Y capacitor on the component mounting surface and solder them on the back side, and place the component mounting surface in the position where it abuts against the board support wall toward the case body, and the terminal block in the board through hole And a component mounting circuit base that is electrically and mechanically connected by soldering on the back side of the board exposed to the outside with each connection pin extending from the ground terminal side inserted Characterized by comprising a.

  Here, a plurality of common mode choke coils may be provided. The AC input terminal block and the AC output terminal block are single-phase AC terminals, and the components of the single-phase AC noise filter circuit are mounted on the component mounting circuit board. Further, the AC input terminal block and the AC output terminal block are three-phase AC terminals, and the components of the three-phase AC noise filter circuit may be mounted on the component mounting circuit board.

The present invention provides a method for manufacturing a noise filter. A method of manufacturing a noise filter according to the present invention includes:
(1) As a case body, an AC input terminal block and an AC output terminal block are integrally formed on both sides of a case bottom plate having a metal bottom plate disposed on the back surface, and a board support wall is erected integrally between the terminal blocks. The connection pin protrudes from the tip of the connection fitting connected to the ground terminal provided on the case bottom plate side, and the connection pin protrudes from the tip of the connection pin to the board placement position.
(2) Place the common mode choke coil, X capacitor and Y capacitor on the mounting surface of the circuit board, and solder the connection terminal of the common mode choke coil and the lead terminal of each capacitor,
(3) The circuit board is mounted on the case body with the component mounting surface on the inside and the solder surface on the outside. Solder with the terminal block of the case body and the connection tip from the ground terminal inserted into the through hole of the circuit board. To fix the connection.

According to the noise filter of the present invention, the connection pin from the terminal block and the ground terminal is positioned at a height at which the circuit board can be inserted from the case body side, and the circuit board on which components are already mounted is mounted upside down. In addition, the soldering operation is performed on the solder surface exposed to the outside (upper part), and the soldering surface is exposed to the upper outer side, so that the soldering operation becomes extremely easy, and the soldering makes it possible to There is a merit that simultaneous connection and mechanical connection can be performed simultaneously, manufacturing is extremely easy, productivity can be improved, and cost can be reduced.

  FIG. 1 is an external view showing an embodiment of a noise filter according to the present invention. In this embodiment, a single-phase AC noise filter will be described. The noise filter 10 is integrally provided with an AC input terminal block 18, an AC output terminal block 20, and two ground terminals 25 on both sides of the case body 12, and a cover 14 is attached to the case body 12.

  As shown in the circuit diagram of the present embodiment in FIG. 2, the noise filter 10 is a low-frequency common mode formed by winding a conductive wire around a toroidal core between the AC input terminals 18a and 18b and the AC output terminals 20a and 20b. Two common mode choke coils 22 for attenuating noise, an X capacitor (across the line capacitor) 24 connected between the input side and output side lines of the common mode choke coil 22, and a common mode in a high frequency range In order to attenuate noise and normal mode noise, a Y capacitor (line bypass capacitor) 26 connected between the line ground on the output side is provided. Although not shown, a bleeder resistor for discharging the accumulated charge of the capacitor when the power is turned off may be provided between the lines.

  FIG. 3 is an exploded view of the present embodiment. In FIG. 3, the noise filter 10 of the present embodiment is roughly divided into a case body 12, a circuit board 28 on which circuit components are mounted, and a cover 14.

  The case body 12 has an AC input terminal block 18 and an AC output terminal block 20 integrally formed on both sides of the bottom plate 12a, and a substrate support wall 36 is integrated at two locations between the AC input terminal block 18 and the AC output terminal block 20. The AC input terminal block 18 and the AC output terminal block 20 incorporate a terminal fitting 30 having a connection pin 34 protruding upward.

  A metal bottom plate 15 is attached to the back surface of the case body 12, and the metal bottom plate 15 is provided with a screw hole at a bent portion by cutting a corner portion, and a screw for the ground terminal 25 is attached thereto.

  Further, from the position adjacent to the ground terminal 25 of the metal bottom plate 15 as shown in the explanatory diagram of the internal structure in which the cover is removed and the circuit board 28 is seen through and the internal structure in FIG. The connection metal fitting 40 which protruded the connection pin 38 at the front-end | tip is protruded by cutting and raising, and the front-end | tip of the connection pin 34 and the connection pin 38 is extended to the board | substrate arrangement | positioning position. 4 and 5 show the internal structure of the case main body 12 shown in FIG.

  Referring to FIG. 3 again, the circuit board 28 has a common mode choke coil 22, an X capacitor 24, and a Y capacitor 26 arranged on the component mounting surface located on the lower side, and the lead terminals that have penetrated the solder surface on the back side are soldered. Has been.

  The circuit board 28 is assembled in the case body 12 with the component mounting surface inward (downward) in the component mounting state, and is mounted on the board support wall 36 of the case body 12 to determine the mounting position. At this time, the connection pins 34 erected upward from the AC input terminal block 18 and the AC output terminal block 20 arranged on the case body 12 side and the connection pins 38 at the tip of the connection fitting 40 erected from the metal bottom plate 15 are circuit boards. It penetrates through holes 34a and 38a formed in 28.

  In this way, the connection pins 34 and 38 projecting from the back surface (upper surface) of the circuit board 28 are attached to the case body 12 by soldering, so that electrical and mechanical connection is achieved. In particular, since the part to be soldered with the circuit board 28 assembled to the case body 12 is on the back surface exposed on the upper part of the circuit board 28 as shown in FIG. 5, for example, the soldering work is easy. Excellent productivity and high productivity.

  FIG. 6 is an explanatory view of the present embodiment with the cover removed, FIG. 6 (A) is a front view, FIG. 6 (B) is a plan view, and FIG. 6 (C) is a circuit board component mounting state. It is a top view.

  As apparent from FIGS. 6A and 6B, the connection pins 34 of the AC input terminal block 18 and the AC output terminal block 20 provided on the case body 12 side and the connection fitting 40 corresponding to the two ground terminals 25 are provided. Each of the leading connection pins 38 extends upward beyond the position where the circuit board 28 is determined by the board support wall 36. By incorporating the circuit board 28 with the component mounting surface facing downward, Positioning and insertion of the connection pins 34 and 38 into the circuit board 28 can be performed, and in this state, the connection pins 34 and 38 protruding through the circuit board 28 can be easily soldered.

  In the circuit board 28 of FIG. 6C, through holes 34 a of the connection pins 34 from the terminal block are formed at four locations outside the X capacitor 24, and the connection fitting 40 is formed outside the Y capacitor 26. A through hole 38 a of the connection pin 38 is formed.

  FIG. 7 is a circuit diagram of a noise filter for three-phase alternating current as another embodiment of the present invention, in which a lead wire is connected to the toroidal core between the AC input terminals 18a, 18b, 18c and the AC output terminals 20a, 20b, 20c. Two common mode choke coils 22 for attenuating low-frequency common mode noise formed by winding and X capacitors (Across the Lines) connected between the input side and output side lines of the common mode choke coil 22 A capacitor) 24 and a Y capacitor (line bypass capacitor) 26 connected between each line and ground on the output side in order to attenuate high-frequency common mode noise and normal mode noise.

  The three-phase AC noise filter is also roughly divided into a case body, a circuit board on which circuit components are mounted, and a cover, as in the embodiment of the single-phase AC noise filter of FIGS. 1 to 6. By soldering the connecting pins that protrude from the back surface (upper surface) of the circuit board on which the components are already mounted, the electrical and mechanical connection can be made easily and easily, making assembly work easier and improving productivity. Can do.

In the present embodiment, two common mode choke coils 22 are provided between the input and the output to improve the noise cut performance. However, the number of common mode choke coils 22 may be one.

1 is an external view of an embodiment of a noise filter according to the present invention. Circuit diagram of this embodiment Assembly exploded view of this embodiment Explanatory drawing which shows the circuit board of this embodiment as a see-through state Explanatory drawing of the state where the circuit board of this embodiment is assembled Explanatory drawing of the state where the cover of this embodiment is removed Circuit diagram showing another embodiment of the present invention Illustration of conventional example Explanatory drawing with the cover of the conventional example removed Circuit diagram of conventional example

Explanation of symbols

10: noise filter 12: case main body 12a: bottom plate 14: cover 15: metal bottom plate 18: AC input terminal blocks 18a, 18b, 18c: AC input terminal 20: AC output terminal blocks 20a, 20b, 20c: AC output terminal 22: Common mode choke coil 24: X capacitor 24a, 26a: Lead terminal 25: Ground terminal 26: Y capacitor 28: Circuit board 30: Terminal fitting 34, 38: Connection pin 34a, 38a: Through hole 36: Board support wall 40: Connection Metal fittings

Claims (5)

An AC input terminal block and an AC output terminal block are integrally formed on both sides of the case bottom plate with a metal bottom plate disposed on the back surface, and a substrate support wall is erected integrally between the terminal blocks and connected upward from the terminal block. A case body that protrudes from the tip of a connection fitting connected to a ground terminal provided on the case bottom plate side and protrudes a pin, and the tip of each connection pin extends to the board placement position;
A common mode choke coil, an X capacitor, and a Y capacitor are arranged on the component mounting surface and soldered on the back surface, and the component mounting surface is built in and disposed at a position that contacts the substrate support wall toward the case body. A component mounting circuit board that is electrically and mechanically connected by soldering on the back side of the board exposed to the outside in a state where the connection pins extending from the terminal block and the ground terminal side are inserted into the through holes. When,
A noise filter characterized by comprising:
The noise filter according to claim 1, comprising a plurality of the common mode choke coils.
2. The noise filter according to claim 1, wherein the AC input terminal block and the AC output terminal block are single-phase AC terminals, and components of a single-phase AC noise filter circuit are mounted on the component mounting circuit board. And a noise filter.
2. The noise filter according to claim 1, wherein the AC input terminal block and the AC output terminal block are three-phase AC terminals, and a component of a three-phase AC noise filter circuit is mounted on the component mounting circuit board. And a noise filter.
In the noise filter manufacturing method,
As the case body, an AC input terminal block and an AC output terminal block are integrally formed on both sides of the case bottom plate with a metal bottom plate disposed on the back surface, and a substrate support wall is erected integrally between the terminal blocks. The connection pin protrudes from the tip of the connection fitting connected to the ground terminal provided on the case bottom plate side and protrudes the connection pin upwards inside, and the tip of each connection pin extends to the board placement position,
Place the common mode choke coil, X capacitor and Y capacitor on the mounting surface of the circuit board, and solder the connection terminal of the common mode choke coil and the lead terminal of each capacitor that penetrates the solder surface on the back side.
The circuit board is mounted on the case body side with the component mounting surface on the inside and the solder surface on the outside, and the connection tip from the terminal block and ground terminal of the case body is inserted into the through hole of the circuit board. A method of manufacturing a noise filter, characterized by being soldered and fixedly connected.

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