JPH0525220Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to the structure of a noise filter.

[Conventional technology]

Conventional noise filters have a box-shaped case with input and output terminals, a toroidal arch yoke coil,
There is a case in which a circuit element such as a capacitor is housed, connected to a filter circuit, and the circuit element is fixed by injecting and solidifying resin into the case.

On the other hand, there is also a type that does not use a box-shaped case and uses a board-mounted chiyoke coil in which a split core is assembled to a winding frame with a pin terminal.

[Problem that the invention attempts to solve]

Noise filters using box-shaped cases have the problem of high manufacturing costs because they have a large number of parts and require complex assembly work and many steps.

On the other hand, it has been difficult to combine a noise filter using a board-mounted chiyoke coil with a capacitor.

The purpose of the present invention is to provide a noise filter that does not require a case and is suitable for incorporating a capacitor.

[Means for solving problems]

According to the present invention, square flanges are provided at both ends in the axial direction of the cylindrical winding core and on the outer surface of the intermediate portion, and from the side edges of the square flanges provided at both ends, a plate having a hole at one end is formed. Approximately hook-shaped terminals each protruding as a terminal and having the other end protruding as a pin terminal from a bottom edge substantially perpendicular to the side edge of the square collar provided at both ends are implanted, while at the both ends. A winding frame with a grounding terminal embedded in the bottom edge of the intermediate collar corresponding to each of the bottom edges of the square collar provided in the winding frame, and a winding frame wound between both end flanges and the intermediate collar of the winding frame. It consists of a coil made of windings with the same number of turns, and a capacitor whose bottom surface is in contact with the plate terminal by inserting lead wires into the holes of the plate terminal, and the ends of the winding are A noise filter is obtained which is characterized in that it is connected to a pin terminal, and a split magnetic core is inserted into the cylindrical winding core of the winding frame to form a closed magnetic path.

Further, the capacitor is a block capacitor in which at least two capacitors are molded in resin, and has a ground wire, and when the lead wire of the block capacitor is inserted into the hole of the plate terminal and assembled to the winding frame, the block capacitor is A noise filter is obtained, characterized in that a lead wire is connected and the ground wire is connected to the ground terminal.

〔Example〕

FIG. 1 is an exploded perspective view of an embodiment of a noise filter according to the present invention.

The winding frame 1 is formed by integrally molding thick rectangular flanges 3 and intermediate flanges 4 at both ends and an intermediate portion in the direction of the central axis of a rectangular cylindrical winding core 2 made of an insulator, and the central axis is aligned with the substrate surface. It is installed so that it is parallel to the Three grooves 31 for magnetic core fitting, which will be described later, are formed on the outer surface of each of the rectangular flanges 3 at both ends, and a projecting piece 32 is provided on one edge serving as the bottom. In addition, square tsuba 3
A hook-shaped terminal 5 (four terminals in total) is planted on one edge of the terminal. In the figure, the downwardly protruding portion of the terminal 5 is a pin terminal 51, and the portion of the hook shape, that is, the protruding portion from the side edge of the square collar 3 is a plate terminal 52 provided with a through hole. Projections 41 having the same dimensions as the projections 32 are formed on both sides of the bottom edge of the intermediate flange 4,
A groove 42 is provided in the protruding piece 41. Intermediate Tsuba 4
A pin terminal 6 for grounding is also implanted in the center of the bottom edge.

FIG. 2 is an external view of the winding frame 1. The winding core 2 between the rectangular flange 3 and the intermediate flange 4 of this winding frame 1 has two windings of the same number of turns.
windings 7 and 8 (indicated by dashed-dotted lines in Figure 1) are respectively wound, and the ends of the windings 7 and 8 are connected to pin terminals 5.
Connected to 1. After that, the two U-shaped powder magnetic cores 9 are inserted into the vertical core grooves 31 as shown by the two-dot chain line in FIG. Hold it with a clamp to form a closed magnetic path to create a board-mounted chiyoke coil.

For example, as shown in Fig. 3, the capacitor 10 is made by connecting two capacitors _Cy in series and molding it into a rectangular plate shape by exposing the lead wires on both sides and the lead wire from the connection midpoint. This is a molded block capacitor. The lead wires 11 on both sides of the capacitor 10 are connected to two plate terminals 52 of the square collar 3.
The lead wires 12 from the midpoint are exposed from the center.

Plate terminal 52 of winding frame 1 finished as a chiyoke coil
The lead wire 11 is inserted into the through hole from above, and the capacitor 10 is connected by soldering with the bottom surface of the capacitor 10 in contact with the plate terminal 52. In addition, the lead wire 12 is connected to the protruding piece 4.
1 through the groove 42 and connect to the grounding pin terminal 6. In this way, a board-mounted noise filter having the equivalent circuit shown in FIG. 3 can be manufactured. Here, the windings 7 and 8 are wound so that the magnetic fluxes cancel each other out, and therefore the chi-yoke coil is for normal mode.

The number of capacitors 10 is not limited to one, and as shown in FIG. 4a, a capacitor C _x may be added in addition to the block capacitor including the two capacitors C _y described in FIG. 1. Alternatively, as shown in FIG. 4b, it may be a block capacitor in which two capacitors _Cy and one capacitor _Cx are integrally molded.

The windings 7 and 8 may be wound so that their magnetic fluxes add to each other, and a capacitor C _x may be added as the capacitor 10 to form the noise filter shown in FIG. 4c.

[Effect of idea]

As explained above, according to the present invention, it is possible to provide a novel board-mounted noise filter that does not use a case. This noise filter has rectangular flanges provided at both axial ends of the cylindrical winding core of the winding frame, one end of which protrudes as a plate terminal having holes, respectively.
A substantially key-shaped terminal whose other end protrudes as a pin terminal is implanted, so that the plate terminal and the pin terminal are integrated. From this, when the capacitor lead wire is inserted into the hole in the plate terminal to connect the capacitor to the plate terminal, the capacitor lead wire is also connected to the lead terminal at the same time.

Therefore, since the present invention has a structure suitable for being incorporated into a winding frame, the assembly process during manufacturing is reduced compared to the conventional one, and the assembly process is simple, so it can be manufactured at low cost. It has the advantage that many different types can be easily made.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the noise filter according to the present invention, Fig. 2 is an external view of the winding frame in Fig. 1, Fig. 3 is an equivalent circuit diagram of the noise filter in Fig. 1, and Fig. 4 The figure is an equivalent circuit diagram of another noise filter. 1... winding frame, 2... winding core, 3... square tsuba, 4...
...Middle collar, 5...terminal, 6...earth pin terminal, 10...capacitor.

Claims (1)

[Claims for Utility Model Registration] 1. Square flanges are provided at both ends in the axial direction of the cylindrical winding core and on the outer surface of the intermediate portion, and a hole is formed at one end from the side edge of the square flanges provided at both ends. While implanting approximately hook-shaped terminals each protruding as a plate terminal having a shape, and having the other end protruding as a pin terminal from a bottom edge substantially perpendicular to the side edge of the rectangular collar provided at both ends, A winding frame in which a grounding terminal is embedded in the bottom edge of the intermediate flange corresponding to each of the bottom edges of the rectangular flanges provided at both ends, and a winding frame having a grounding terminal embedded therein, and a space between both end flanges of the winding frame and the intermediate flange, respectively. It consists of a coil made of the same number of turns of wire, and a capacitor whose bottom surface is in contact with the plate terminal by inserting lead wires into the holes of the plate terminal, and the end of the winding. A noise filter characterized in that the part is connected to the pin terminal, and a split magnetic core is inserted into the cylindrical core of the winding frame to form a closed magnetic path. 2. The capacitor is a block capacitor in which at least two capacitors are molded in resin, and has a ground wire, and the lead wire of the block capacitor is inserted into the hole of the plate terminal and assembled to the winding frame, and the lead wire of the block capacitor is inserted into the hole of the plate terminal. A noise filter characterized in that a wire is connected, and the ground wire is connected to the ground terminal.