JPH06224059A - Noise filter device for board - Google Patents

Abstract

PURPOSE:To provide a noise filter device for board, wherein the device can be constituted in a small size compared to a conventional method and at the same time, a temperature distribution in the interiors of housings is made roughly uniform. CONSTITUTION:A flat conductor is curved in its width direction in such a way that the conductor is superposed in its thickness direction to form spirally and with a choke coil CH constituted, a circuit board PK is housed in housings 1a and 1b in a state that conductor wires 2 connected to an input terminal (a) and the like and conductor wires 2 connected to an output terminal (c) and the like cross each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise filter device for a board which is housed and mounted in a board.

[0002]

2. Description of the Related Art A conventional noise filter device for a board uses a very high capacity choke coil, and the choke coil is formed by manually winding a circular copper wire around a ring-shaped core. .

[0003]

However, in the conventional noise filter device for a board, since the wire type of the copper wire forming the choke coil is quite thick, the copper wire cannot be densely wound around the link-shaped core. , The choke coil is very large, and therefore the housing of the panel noise filter device itself is also very large, and the size balance with other panel devices such as a breaker and a noise transformer for low current is small. It was not taken. Also, since a high-capacity choke coil emits extremely high heat, the temperature distribution inside the panel noise filter device may not be uniform, and only one place may become abnormally hot. Had to use.

The present invention has been made in order to solve the above problems. The first object of the present invention is that it can be made smaller than the conventional one, and the temperature distribution inside the housing can be made substantially uniform. Another object of the present invention is to provide a noise filter device for a board. A second object of the present invention is to provide a noise filter device for a board, which can be mounted in a board and has a size substantially equal to that of other board devices.

[0005]

SUMMARY OF THE INVENTION The invention as set forth in claim 1 for achieving the first object is a noise filter device for a panel to be housed and mounted in a panel, wherein an input terminal is provided in a housing. And a circuit board on which a noise filter circuit having an output terminal and a choke coil is mounted, the circuit board and the input terminal and the output terminal are connected by a conductor, and In a noise filter device for a board containing a circuit board, the choke coil is formed by bending the rectangular conductor in the width direction so that the rectangular conductor overlaps in the thickness direction, and forming the spiral shape in a spiral shape. It is characterized in that the circuit board is housed in the housing in a state where a conductor wire connected to an input terminal and a conductor wire connected to the output terminal intersect each other. Further, the invention according to claim 2 made to achieve the second object is characterized in that, in the invention according to claim 1, the housing is a board module.

[0006]

According to the first aspect of the present invention, the choke coil is configured by forming the rectangular conductor into a spiral shape by bending the rectangular conductor in the width direction so that the rectangular conductor overlaps in the thickness direction thereof. The coil itself can be made much smaller than the conventional one. Further, the conductor connected to the input terminal and the conductor connected to the output terminal intersect with each other, by housing the circuit board in the housing, the length of the conductor can be sufficiently long, Since the heat of the choke coil is sufficiently diffused by the conductive wire, the temperature distribution in the housing can be made substantially uniform.

Further, according to the invention described in claim 2, since the board noise filter device itself according to claim 1 is used as a board module, even when mounted in the board, it has substantially the same size as other board devices. It can be balanced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

FIG. 2 is an exploded perspective view showing an embodiment of the board noise filter device according to the present invention, and FIG. 1 is a partially exploded side view showing the board noise filter device.

In a noise filter device for a board according to an embodiment of the present invention, a choke coil CH and a noise filter circuit constructed by using the choke coil CH are mounted in a housing composed of a cover portion 1a and a body portion 1b. The circuit board PK is stored. On the surface of the cover portion 1a of the housing, a screw-fastening type input terminal a,
b, output terminals c and d, and ground terminals e and f are provided, and the lead wire 2 is soldered and connected from the input terminals a and b, the output terminals c and d, and the ground terminals e and f, respectively. The fixed terminal piece extends inward of the housing.

Incidentally, P1 to P4 on the circuit board PK
Is a circuit pattern made of a laminated copper plate, and a varistor Z and capacitors C1 to C4 are fixed by soldering between the circuit patterns P1 to P4.

FIG. 4 is a circuit diagram showing the noise filter circuit 17. Parts other than the choke coil CH of the noise filter circuit 17 shown in FIG. 4 are mounted on the circuit board PK by soldering. As shown in FIGS. 2 and 4, the noise filter circuit has a general configuration including the varistor Z that is a surge absorbing element, the choke coil CH, and the capacitors C1 to C4. However, in the case of the noise filter circuit 17 of the present embodiment, the choke coil CH having the structure shown in FIGS. 1 to 3 is used. 1 and 2 are a plan view and a perspective view of the choke coil CH, and FIG. 3 is an exploded view of the choke coil CH. The choke coil CH is described in [Japanese Patent Application No. 4-64223] previously filed by the present applicant, and the rectangular conductors 41c and 43c are mainly arranged so that the rectangular conductors 41c and 43c overlap each other in the thickness direction. A rectangular coil 41, 43 formed by bending in the width direction into a spiral shape, and a magnetic core 40 for magnetically coupling the plurality of rectangular coils 41, 43.
40, and the core cores 40a, 40a provided in the magnetic cores 40, 40 are respectively provided with central shaft holes 41d, 43 formed in the rectangular coils 41, 43, respectively.
d, so as to penetrate each of the plurality of rectangular coils 41, 43
Is sandwiched between two magnetic cores 40, 40. The two magnetic cores 40, 40 are magnetically coupled in a loop shape inside the central shaft holes 41d, 43d of the rectangular coils 41, 43 and outside the rectangular coils 41, 43. Further, from the rectangular coil 41, the coil end 41a,
41b is projected, and the coil ends 43a and 43b are similarly projected from the rectangular coil 43. or,
An insulating bobbin 42 is interposed between the plurality of rectangular coils 41, 43, and the two magnetic cores 40, 40
The core cores 40a, 40a are joined to each other in a through hole 42a provided in the insulating bobbin 42. According to the structure of the choke coil CH, the loop area of the magnetic circuit of the magnetic cores 40, 40 is large and the effective length can be shortened. It can be made much smaller than a choke coil with windings. That is, the choke coil CH having the configuration of this embodiment
By using, a very small choke coil CH can be configured as compared with the case of using a conventional single layer winding choke coil. The choke coil CH preferably has a capacity of about 20 amps.

The assembled state of the board noise filter device of this embodiment will be described with reference to the disassembled portion of FIG. The choke coil CH is housed in the body portion 1b of the housing, and the choke coil CH has a coil end 41a.
Is soldered to the pattern P1 of the circuit board PK, its coil end 41b is soldered to the pattern P2 of the circuit board PK, and its coil end 43a is soldered to the pattern P5 of the circuit board PK. 43b is soldered and connected to the pattern P3 of the circuit board PK.

Reference numeral 2 is a conductive wire. In FIG. 1, the pattern P1 on the circuit board PK and the input terminal b are connected to each other by a conductive wire 2.
Soldered and connected by the pattern P2 on the circuit board PK
And the input terminal a are soldered and connected by the conductor wire 2, the pattern P3 of the circuit board PK and the input terminal c are soldered and connected by the conductor wire 2, and the pattern P4 of the circuit board PK and the ground terminal e are connected. The ground terminal f is soldered and connected to the ground wire 2. In the configuration of the present embodiment, the heat generated from the choke coil CH is conducted to the terminals a, b, c, d, e and f through the lead wire 2 and the terminals a, b, c, d, Since e and f may become high in temperature, as shown in FIG. 1, if a plurality of conductors 2 are arranged so as to intersect each other as shown in FIG. 1, the length of the conductors can be made sufficiently long. Therefore, the heat generated from the choke coil CH is sufficiently radiated in each conductor 2, and the temperature rise of each of the terminals a, b, c, d, e, f can be prevented. At this time, each of the conductors 2
As a result, if a relatively thick multifilamentary wire having a cross-sectional area of, for example, about 2 mm ² is used, heat dissipation is further improved. Further, it is more preferable to connect a heat radiating plate to the ends of the conductors 2a, 2b, 2c, 2d. As described above, by arranging the conductors 2 so as to intersect with each other, the heat radiated from the conductors 2 is diffused to various places in the housing as described above, and as a result, the heat of the embodiment is obtained. The temperature distribution inside the noise filter device for the panel becomes almost uniform,
It is possible to prevent a situation where only one place gets extremely hot.

The noise filter device for a board according to this embodiment has a small choke coil CH.
Since the board noise filter device itself can be made smaller than the conventional one, the housing can be configured as a board module. In the present embodiment, the housing has a structure of a BAK module for a board, and has substantially the same size as a board device of another BAK module. This enables one-touch mounting using the existing metal fittings in the panel, and balance with other panel devices to be mounted in the panel.

[0016]

According to the invention of claim 1 configured as described above, since the choke coil itself can be made much smaller than the conventional one, the panel noise filter device itself can be made smaller than the conventional one, and therefore, It becomes easy to store and install in the panel. Since the heat generated from the choke coil is diffused inside the housing by the conductive wire, the temperature distribution inside the housing can be made almost uniform, and there is no danger of abnormal heating in only one place. .

Further, according to the second aspect of the invention, since the in-board noise filter device is a board module, it is balanced with other board devices even when mounted in the board, and the layout in the board is achieved. Is very easy to do.

[Brief description of drawings]

FIG. 1 is a partially exploded side view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an embodiment of the present invention.

FIG. 3 is an exploded view showing a choke coil CH in one embodiment of the present invention.

FIG. 4 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1a (housing) cover part 1b (housing) body part 2 conductor wire 17 noise filter circuit 41c, 43c rectangular conductor a, b input terminal c, d output terminal PK circuit board CH choke coil

Claims (2)

[Claims] 1. A noise filter device for a panel housed and mounted in a panel, comprising a circuit board having a noise filter circuit having an input terminal and an output terminal disposed in a housing and having a choke coil. A circuit board noise filter device in which the circuit board is connected to the input terminal and the output terminal by a conductor, and the circuit board is housed in a housing, wherein the choke coil has a rectangular conductor in a thickness direction thereof. The rectangular conductor is bent in the width direction so as to be overlapped so as to be formed in a spiral shape, and the conductor wire connected to the input terminal and the conductor wire connected to the output terminal intersect each other,
A noise filter device for a board, wherein the circuit board is housed in the housing. 2. The board noise filter device according to claim 1, wherein the housing is a board module.