JPH03143008A - Noise filter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a noise filter using an LC composite element.

[Conventional technology]

FIG. 5 is a diagram showing the structure of a layered film of a conventional LC composite element disclosed in, for example, Japanese Unexamined Patent Publication No. II/759-139619, and FIG. 6 is a diagram of the layered film of FIG. FIG. 7 is a partially cutaway external view of an LC composite element using a magnetic material, and is an equivalent circuit diagram of No. 6 rA'l.

In the figure, 1.2 is an insulating film, 3.45 is an electrode foil, 3a, 3b, 4a, and 5b are terminals provided on the electrode foil, and 6 is a magnetic core. A composite film C is formed by wrapping a layered film consisting of insulating films 1 and 2 and foil inserts 3 and 4.5 shown in Fig. 5 around point 6.

In FIGS. 5 and 6, the terminals 4a and 5bli are connected as inductance coils between the ends 3a and 3b.
1 operates as a capacitor. FIG. 7 shows the equivalent circuit, and the inductance between terminals 3a and 3b is represented, and the capacitance is represented between terminals -4a and 5b.

Conventionally, a noise filter has been constructed using such an LC complex element. This is a noise filter that utilizes the inductance and capacitance exerted by the LC composite element as described above.

[Problem to be solved by the invention] However, as described above, conventional noise filters consist of a foil coil formed by cutting out one electrode and two insulating films or paper on a winding core. , using an LCiC main stand that concentrically integrates two electrode foils on the outer circumferential surface of this coil and a Jf6 capacitor formed by wrapping two sheets of insulating film or paper to serve as the XfJ electric body. Since the noise filter is constituted by a coil and a capacitor, the coil and capacitor form a single distributed constant coil and capacitor, respectively, and are nothing more than two integrated and composite parts for concentric purposes.

In addition, in conventional LC composite elements, the terminals are fixed.
There was a problem in that it was difficult to set appropriate inductance and capacitance values as a noise filter.

This invention was made in order to solve the above-mentioned problems, and aims to provide a noise filter equipped with an LC composite element that can constitute a distributed constant filter and also has a common mode transmission function. purpose.

[Step-F for solving problems]

For this reason, in the present invention, in a noise filter consisting of a coil and a capacitor, 'I'if bar foils each having a terminal at one end of 21 peaks are alternately connected via an insulating film for a number of j times.
;'; An LC composite element integrally formed by winding a layered film marked with j+1 in a spiral shape from one end side;
By providing a noise filter characterized by comprising a magnetic core pushed into the center of the spiral of the C complex element, and a holder that holds the LCC complex element terminal at a predetermined value (I71met), [This is aimed at achieving one goal.]

[Effect]

With the above configuration, the device functions as a constant LC composite element with a simple structure, and the holder to which the terminal is fixed allows stable mounting and functions as a noise filter.

〔Example〕

The present invention will be explained below with reference to examples.

FIG. 1 is an exploded perspective view 5 of a noise filter according to the present invention.
FIG. 2 is a perspective external view of the same assembly as seen from the terminal side, and FIG. 3 shows an equivalent circuit country of the same noise filter. Note that the same (equivalent) components as in the conventional example shown in FIGS. 5 to 7 are indicated by the same reference numerals.

In FIGS. 1 and 2, 7 is an LC composite component consisting of a coil and a capacitor described in the prior art Japanese Patent Application No. 1-220864 related to the present application, and is an electrode foil with terminals provided at both ends. A layered film consisting of 61 alternate layers of intermediate electrode foil with terminals on one side and electrode foils with terminals on both ends with insulation films interposed therebetween was integrally formed by winding it in a spiral shape from one end. LC composite element with a common mode choke function; 8 is a base that also holds insulation for positioning and fixing terminals; 9 is a case that houses the LC composite element 7; 10a to 10e are each electrode of the LC composite element 7. It is a foil terminal.

A magnetic core 6 forming a magnetic closed circuit is pushed into the center of the LC composite element 7 and attached, and the end Y-
The base 8 is mounted so that some of the terminals 10a to 10e are exposed, and then a case 9 for housing the C complex element 7 is placed over the base 8, and the case 9 is fixed to the base 8. A noise filter is formed. FIG. 2 shows its external appearance, and FIG. 3 shows the Kasada circuit diagram of the noise filter. In addition, each terminal 10a to 10 shown in Fig. 2
e corresponds to each terminal symbol shown in the equivalent circuit diagram shown in the third J.

The noise filter configured as described above is used as a mounting plate or as an individually mounted component.

FIG. 4 shows a perspective view of a noise filter according to another embodiment. Note that it is the same as (equivalent to) the conventional example shown in FIGS. 5 to 7 and the first embodiment shown in FIGS. 1 to 3.
Components are indicated by the same reference numerals, and redundant explanation will be omitted.

In the embodiments described above, the vertical shape was shown, but the fourth embodiment
It can also be formed in a horizontal shape as shown in the figure, and the case 9 may be omitted depending on the case.

〔Effect of the invention〕

As described above, according to the present invention, the LC composite element that also has a common moat choke function is integrally configured so that it can be easily used as a distributed constant noise filter.
You can get something cheap.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a noise filter according to an embodiment of the present invention, FIG. 2 is a perspective external view of the same assembly as seen from the terminal side, and FIG. 3 is an equivalent circuit diagram of the same noise filter. FIG. 4 is a perspective configuration diagram of a noise filter according to another embodiment, and FIG.
The figure shows a configuration diagram of a layered film of a conventional LC composite element.
FIG. 6 is a partially cutaway external view of the LC composite element using a magnetic material for the core, and FIG. 7 is an equivalent circuit diagram of FIG. 6. In each figure, the same reference numerals indicate the same (equivalent) components. 6 is a magnetic core, 7 is an LC composite element, and 8 is a heath (holder).

Claims (1)

[Claims] In a noise filter consisting of a coil and a capacitor,
An LC composite element is formed by integrally forming a layered film in which a plurality of electrode foils each having terminals provided at both ends are laminated alternately with an insulating film interposed therebetween. A magnetic core inserted in the center,
A noise filter comprising: a holder for holding the terminal of the LC composite element in a predetermined position.