JPH03208406A - Noise filter element - Google Patents

Abstract

PURPOSE:To improve the element characteristic with simple constitution by providing two amorphous magnetic alloy thin strips or over each having an electrode while they being laminated or wound and forming an air-core part to part of the element. CONSTITUTION:Co base amorphous magnetic alloy thin strips 5a, 5b whose surface is applied with copper plating 2mum thick, whose size is 18mum thick and 5mm wide and whose composition is Co73Fe5Si8B14 and two polyimide group films whose thickness is 7.5mum, in total four sheets, are laminated alternately, and the resulting sheet is wound onto a bobbin 6mm in diameter to obtain a troidal core whose size in 10mm in outer diameter, 6mm in inner diameter and 5mm in height. An electrode 6a(6b) is provided to the amorphous magnetic alloy strip 5a (5b) of the core respectively to obtain the element. Moreover, a lead wire is penetrated to an air-core 2 being an air gap in the center of the element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to inductors and capacitors, and more particularly to noise filter elements used in semiconductor circuits such as switching power supplies and digital circuits.

(Prior art) Conventionally, in semiconductor circuits such as switching power supply circuits that control large currents in the high frequency range, current spikes and linking occur due to the properties of the semiconductor itself and other circuit factors. The problem is that it is easy to do.

These above-mentioned phenomena may interfere with normal circuit operation and eventually destroy the semiconductor itself.

Further, rapid current changes caused by switching operations in the circuit described above generate conduction noise and radiation noise, leading to noise disturbances in equipment incorporating the circuit.

In recent years, in response to calls for stronger international measures against such noise disturbances, strong efforts have been made to prevent noise from being generated by various devices incorporating semiconductor circuits.

As one measure against this problem, it has been common practice to incorporate a filter circuit that combines an inductance and a capacitor to prevent noise from propagating to the outside.

(Problems to be Solved by the Invention) Such a filter circuit that combines an inductance and a capacitor basically has a large number of parts and is complicated, and must be installed in series in the semiconductor circuit itself. Moreover, since it is not possible to directly incorporate the circuit into a printed circuit board that has been created by forming a circuit, problems may arise depending on the application. Furthermore, such a filter circuit has a relatively large size, which is disadvantageous in terms of space saving.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a noise filter element having a simple structure and excellent element characteristics.

[Structure of the Invention] (Means and Effects for Solving the Problems) Summary of the Invention The noise filter element of the present invention consists of two layers of amorphous magnetic alloy thin strips each provided with an electrode through a dielectric layer. It is characterized by being made by laminating or winding, and having an air core formed in the negative part.

Further, the present invention provides a method in which lines of a semiconductor circuit or lead portions of various elements are passed through the air core portion of the noise filter element, and the lead portion is connected to an electrode provided on an amorphous magnetic alloy ribbon. The present invention provides a noise reduction device characterized by the following.

Detailed Description of the Invention The first feature of the noise filter element of the present invention is that it is made by winding or laminating amorphous magnetic alloy ribbons, and a part thereof is provided with an air core. .

This air core portion is for inserting the line portion of the semiconductor circuit or the lead portions of each of the eight children.

In the element of the present invention, the line part of the semiconductor circuit or the lead part of various elements is inserted into the air core part of the element of the present invention.
It acts as an inductance for the line part of a semiconductor circuit or the lead part of various elements.

On the other hand, the second feature of the present invention is that the double amorphous magnetic alloy ribbons provided with electrodes can be laminated or wound with a dielectric layer interposed between them. be.

That is, at least one pair of alloy ribbons face each other with a dielectric layer in between, and as a result, capacitance is generated between the electrodes of those alloy ribbons, forming a so-called capacitor.

That is, the element of the present invention can act as a single element as an inductance and a capacitor on the line part of a semiconductor circuit or the lead part of various elements inserted into the air-core part of the element. That is, according to the element of the present invention, a so-called LC filter circuit can be realized with a single element.

An example of a device according to the invention manufactured by winding is shown in FIG. FIG. 1 is a diagram of an element of the present invention in which an alloy ribbon and a dielectric layer are separately prepared and wound, and a partially unfolded state is shown. The main body 1 of the device of the present invention consists of a hollow core 2 in its central part and a ribbon winding 3. The ribbon winding portion 3 includes amorphous magnetic alloy ribbons 4a and 4b.
The amorphous magnetic alloy ribbons 4a and 4b are provided with electrodes 6a and 6b.

Specifically, the element of the present invention is used by inserting a lead part derived from a semiconductor circuit line or various elements, such as a rectifier element or a capacitor element, into the air core of the element of the present invention. That is, the air core part of the element is fitted onto the line or lead part. Further, the electrodes disposed on the alloy ribbon of the present invention can be connected to an appropriate applicable circuit so as to constitute an LC filter circuit. In the element of the present invention, one electrode provided on the alloy thin strip is connected to the line part of the semiconductor circuit inserted into the air core part of the element or the lead part of various elements, and the other electrode is connected to the LC filter circuit as appropriate. This type of usage is preferred from the viewpoint of space saving.

The mode of use is shown in FIG. In FIG. 2, the lead portion 8 of the element 7 is inserted into the air core portion 2 of the element 1 of the present invention. One of the electrode lead parts 6a of the element of the present invention is connected to this lead part 8. Then, the other electrode lead part 6b is connected to an appropriate applicable circuit and an appropriate LC
Configure a filter circuit.

Furthermore, in such a mode of use, it is not only necessary to simply fit the leads of various elements such as rectifier elements and capacitor elements, but also to connect various elements and the element of the present invention using electrically insulating synthetic resin. Both may be molded and integrated.

As the amorphous magnetic alloy ribbon of the element of the present invention, a Co-based amorphous magnetic alloy ribbon is preferably used. Preferably, those having a composition represented by the following formula (1) can be mentioned.

(Ml-aM-,) too-b Yb ”'
(1) [In the formula, M represents at least one member selected from the group of Fe5Co, M is Ti, V%C', Mn5N
i, Cu%Zr, Nb%Ta, and W, and Y represents at least one member selected from the group of 8%511CSP.

Also, a and b are respectively 0≦a≦0.15.10≦b
Represents a number that satisfies ≦35. ] Among these alloys, C
Preferably, a CO-based amorphous magnetic alloy has a magnetostriction of 3×10 −6 or less in absolute value, more preferably 1×10 −6 or less based on O. In particular, an alloy represented by the following formula (n) is good.

(Co Fe M')
Y-(II)1-x-y x y
100-z z [In the formula, M' and Y both have the same meaning as in formula (I), and x, y, and 2 each satisfy 0.01≦X≦0.1.0≦y≦ 0.1.10≦
Represents a number that satisfies the relationship 2≦32. A more preferable alloy is an alloy represented by the following formula (m).

(Co Fe M”) (Si B
) ・(In)1-c-d c d 1
00-1' 1-e e r [In the dashi formula,
M" represents at least one selected from the group of V, Cr, Mn, Ni5Cu, NbSMo, and c, d, e and f
are 0.01≦C≦0.08.0≦d≦0.1, respectively.
It represents a number that satisfies the following relationships: 0.0.2≦e≦0, 5.20≦f≦30. ] In these alloys, M, M-, and M' are all effective elements for improving the magnetic properties and thermal stability of the alloy, and if M' is contained in an amount exceeding 15 at%, , the cue temperature and saturation magnetic flux density of the alloy decrease. Furthermore, although Y is an essential element for making the alloy amorphous, if its content is less than 10 at% or more than 35 at%, it becomes difficult to make the alloy amorphous. Become. As Y, a combination of Si and B as shown in formula (m) is preferable from the viewpoint of thermal stability; in this case, St is
It is more preferable for the content to be higher than that in terms of the thermal stability and holding power of the alloy.

A ribbon of these alloys can be easily prepared into any composition and ribbon shape by a method commonly used as a molten metal quenching method.

Further, various properties of these materials can usually be improved by appropriately performing heat treatment at a temperature below the crystallization temperature.

In order to use it in the element of the present invention, it is necessary to arrange electrodes on this ribbon. The arrangement of the electrodes is carried out as appropriate by a method commonly used for providing electrodes on ribbons.

The dielectric layer used in the present invention includes one made of a dielectric material that is used as a dielectric material for known capacitors. Specific examples include dielectric ceramics such as barium titanate and dielectric polymer materials such as polyester films, among which dielectric polymers such as polyimide films, polyester films, polypropylene, etc. are preferably used. obtain.

The size and thickness of the ribbon and the guiding layer used in the device of the present invention are not particularly limited as long as they are within the range where the effects of the present invention can be obtained.

The dielectric layer may have a structure in which when the amorphous magnetic alloy ribbons are laminated or wound, the alloy ribbons laminated or wound at the same time do not come into electrical contact with each other and can form a capacitor. It is not limited to profit.

For example, the dielectric material described above may be in the form of a film and may be interposed between the alloy ribbons, or it is preferable to coat the surface of the alloy ribbon with the dielectric material to an appropriate thickness to form a dielectric layer.

The element of the present invention is manufactured by laminating or winding the above-mentioned thin ribbon and the dielectric material forming the dielectric layer, or the alloy thin ribbon coated with the above-described dielectric material.

For example, in the case of winding, first a laminate is formed by alternately laminating ribbons having a predetermined width and thickness and a dielectric material forming a dielectric layer. This laminate is then wound around a bobbin of a predetermined diameter as a core. When the thickness of the ribbon winding portion reaches a predetermined value, winding of the ribbon is stopped, and measures are taken to prevent winding, and then the bobbin is removed. As a result, a toroidal-shaped core body is obtained, which has an air core at the center with the same diameter as the bobbin diameter, and in which the width of the ribbon is its own height. The electrodes provided on the alloy ribbon may be provided on the alloy ribbon before winding, or may be provided after the ribbon is wound.

Furthermore, the element of the present invention can be formed by the same method when winding a ribbon alloy coated in advance with a dielectric material as described above.

In the case of a laminate, a corridor-shaped thin strip of a predetermined size is punched and formed from a thin ribbon, and this thin strip and a dielectric material forming a dielectric layer are coated, or a corridor-shaped thin strip is coated with the dielectric material described above. Manufactured by laminating pieces. At this time, the punched portion of the corridor-shaped thin strip constitutes the air core.

Further, when the electrical resistance of the amorphous magnetic alloy ribbon is high, it is also effective to provide a conductive layer on the surface of the alloy ribbon.

For example, a thin ribbon of a metal with high electrical conductivity, such as silver or copper, is further interposed in contact with the amorphous magnetic alloy ribbon, or a plating layer of a metal with high electrical conductivity as described above is used. A method in which the amorphous magnetic alloy ribbon is provided on the surface and wound or laminated is simple and preferable.

(Example) Example 1 18 um thick, with 2 um thick copper plating on the surface.
The width is 5 dragons, and the composition is CO73F e 5 S 1 sB□
4, a Co-based amorphous magnetic alloy ribbon with a thickness of 7.5 μm
A toroidal film with an outer diameter of 10 x 1, an inner diameter of 6 x 1, and a height of 5 x 1 is obtained by alternately laminating 4 sheets of polyimide film, 2 each, and winding them around a bobbin with a diameter of 6 mm. A core body of the shape was obtained. Electrodes were provided on each of the two amorphous magnetic alloy ribbons of this core body to form the element of the present invention.

The capacitance between the electrodes is 0.0 at 100kHz. The capacitance was 1 μF, which was sufficient for use in an LC noise filter.

Further, when a conducting wire was passed through the air core, which is the gap at the center of this element, and the inductance with respect to this conducting wire was measured, it showed a value of 5 μH at 100 kllz.

Furthermore, when compared with an element obtained from an alloy ribbon having the same composition as the above-mentioned Co-based amorphous magnetic alloy ribbon without copper plating, the resistance of the capacitor was improved by approximately 60%, and the resistance was reduced to 100 ktlz. tan δ of 0.5 to 0
, 15, which has been greatly improved.

Example 2 Example 1 with copper plating on the surface as in Example 1
An amorphous magnetic alloy ribbon having the same thickness, size, and composition as in Example 1 was coated with polyester to a thickness of approximately 2 μm, and two sheets of this alloy ribbon were stacked on top of each other. A noise filter element was manufactured.

The capacitance and inductance between the electrodes of this element are
As a result of measurement under the same conditions as Example 1, each was 0.1
They were 5F and 5μH.

〔Effect of the invention〕

According to the present invention, there is provided a noise filter element which is smaller than conventional ones and which can constitute an LC noise filter circuit by simply fitting it onto the lead portions of various elements and performing simple wiring. can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an element of the invention manufactured by winding, a part of which is shown in an unfolded state. FIG. 2 is a diagram showing a state in which the element of the present invention is fitted onto the lead portion of a circuit element and connected to form an LC filter circuit. DESCRIPTION OF SYMBOLS 1... Noise filter element of this invention, 2... Air core part, 3... Thin ribbon winding part, 4a and 4b... Amorphous alloy ribbon, 5a and 5b... Dielectric layer, 6a and 6b
. . . Electrode, 7 . . . Circuit element, 8 . . . Circuit element lead portion.

Claims (3)

[Claims] 1. Two or more amorphous magnetic alloy ribbons, each provided with an electrode, are laminated or wound with a dielectric layer interposed between the alloy ribbons, and a part of the ribbons is used as a semiconductor circuit line or various elements. 1. A noise filter element, characterized in that an air core portion is formed through which a lead portion of the noise filter element is inserted. 2. 2. The noise filter element according to claim 1, further comprising a conductive layer provided on the surface of each amorphous magnetic alloy ribbon. 3. In the air center portion of the noise filter element according to claim 1,
1. A noise reduction device, characterized in that a line of a semiconductor circuit or a lead portion of various elements is penetrated, and the lead portion is connected to an electrode provided on an amorphous magnetic alloy ribbon.