CN2355498Y

CN2355498Y - Iron core filter

Info

Publication number: CN2355498Y
Application number: CN 98231571
Authority: CN
Inventors: 巫守书
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-30
Filing date: 1998-10-30
Publication date: 1999-12-22
Anticipated expiration: 2008-10-30

Abstract

The utility model discloses an iron core filter. The iron core is composed of a core body (11) and end blocks on both ends thereof; the surfaces of two end blocks are provided with conductive layers (21), and two end blocks form two end electrodes (211) and (212). The core body is provided with the structures of the conductive layers connected with two end electrodes, and the structure of the conductive layer is a conductive layer positioned on the inner wall of the hole (12) of the iron core of the core body, or is a helical conductive layer (31) positioned on the outer surface of the core body (11), or is a conductive layer arranged on the outer surface of the core body. The product effective reduces the magnetic loss, improves work efficiency, and can be made into an integral LC composite element.

Description

The iron core filter

The utility model relates to a kind of circuit devcie, further is meant the iron core filter.

The general employing of traditional iron core filter made by hand, is that one one in lead is passed the iron core body, and utilizes proper implements to carry out bent angle and whole angle operation; Some fairly simple products are also arranged, and automaton that can design specialized is made.Owing to must pass iron core with solid copper wires in the manufacture process of iron core filter, but solid conductor is not efficient conducting medium, and when the iron core filter works in high-frequency environment following time, its conductive medium can produce " kelvin effect ".Make for convenience, the through wires hole inwall of iron-core workpiece and the gap between the lead are the bigger the better, but the main cause of magnetic loss is caused in this excessive gap beyond doubt.The described iron core filter construction of prior art as shown in Figure 1, it is generally made by hand, with (13) bodies that pass irony core body (11) of lead, and utilize suitable instrument to carry out bent angle and whole angle operation, make conductive electrode (131), (132) of lead (13) can place iron core (11) top.In order to make lead (13) can conveniently pass iron core body opening (12), often do greatlyyer, but the increasing in formed gap is the main cause that causes magnetic loss also with this hole (12).

The purpose of this utility model is, designs a kind of iron core filter, improves its end face and line construction, thereby makes easily manufactured and make that magnetic loss reduces, performance improves.

The technical solution of the utility model is, the iron core that described iron core filter has the end block by core body and its two ends to constitute, its design feature is, described two end block surfaces are provided with conductive layer and make this two end block become two termination electrodes, and described core body is provided with and these two conductive coating structures that termination electrode is connected.

Make below in conjunction with accompanying drawing and to further specify.

Description of drawings:

Fig. 1 is the stereochemical structure of the iron core filter of prior art;

Fig. 2 is the sectional structure of the device of Fig. 1;

Fig. 3 is a kind of embodiment stereochemical structure of the present utility model;

Fig. 4 is the sectional structure of device shown in Figure 3;

Fig. 5 is that the performance curve of the utility model product and prior art product compares (dotted line is this product among the figure, and solid line is a known product);

Fig. 6 is an another kind of embodiment stereochemical structure of the present utility model;

Fig. 7 is the sectional structure of device shown in Figure 6;

Fig. 8 is the sectional structure of the third embodiment of the present utility model and the structure situation that constitutes the LC device.

In the accompanying drawings:

10-prior art iron core filter 11-core body 12-iron core body opening

121-hole wall conductive layer 13-lead 131-electrode

132-electrode 21-conductive layer 211-termination electrode

212-termination electrode 31-helical form conductive layer 40-LC composite component

41-capacitor C 411-solder joint 412-solder joint

By Fig. 3 and Fig. 4 as can be known, the iron core that the utility model has the end block by core body (11) and its two ends to constitute, its design feature is that described two end block surfaces have conductive layer (21) and make this two end block become two termination electrodes (211) and (212); The conductive coating structure that becomes to be electrically connected with two termination electrodes (211) (212) is arranged on the described core body (11).Referring to Fig. 4, described core body (11) is gone up a kind of conductive coating structure that becomes to be electrically connected with two termination electrodes (211) (212), core body (11) is gone up cored body opening (12), has hole wall conductive layer (121) to be connected with the conductive layer (21) of described two end blocks on its hole wall; Referring to Fig. 6 and Fig. 7, the another kind of conductive coating structure on the described core body (11) is, helical form conductive layer (31) is set and connects the conductive layer of described two end blocks at core body (11) outer surface.Referring to Fig. 8, also core body (11) surface can be covered with conductive layer and make it connect the conductive layer on described two end block surfaces; If link to each other with two end electrodes respectively through solder joint (411) (412) the two poles of the earth again, then constituted the LC composite component with a capacitor C (or claiming main, passive device).

Conductive layer on conductive layer of the present utility model (21) and (121) and the described core body of Fig. 6, Fig. 8 (11) can adopt application or processing modes such as plating or filler to make its firm attachment in the iron core respective surfaces, and removes the conductive layer part that does not need and constitute surface conductance layer structure shown in the accompanying drawing with the mode of chemical medicinal liquid or machine cut.Making for Fig. 6 or helical form conductive layer (31) shown in Figure 7, conductive layer adheres to core body (11) and two end block integral body in system, utilize cutting technology to be processed into helical form conductive layer (31), in cutting, measure the inductance value at core body (11) two ends, when reaching in the tolerance of setting, it stops cutting, can be made into the accurate inductor (filter) of trueness error within 1% thus, this technology is actually the manufacture process that the utility model is applied to the accurate coil of metal skin membrane type and has suffered.

The utility model adopts said structure, has effectively overcome between described core body (11) that the like product of prior art exists and the excesssive gap between the lead (13) to inscribe, and magnetic loss can be reduced to minimumly, has improved the performance of iron core filtering.Since the described conductive layer that forms by electric conducting material be firm attachment on iron-core workpiece, under high frequency conducts electricity environment, also be the conductive structure that greater efficiency is arranged.As shown in Figure 5, the product of the utility model and the product of known technology compare, the relation between frequency change of the two and the iron core resistance value (Impedance), and this product will be got well.The utility model also can be made LC composite component shown in Figure 8, because iron core itself is exactly an extraordinary suction magnetic material, and going up effect in the inhibition (EMC) of electromagnetism noise is well, and therefore the assembling electronic component is feasible on the substrate that with iron core is the basis.

The utility model technology also can be applicable to the end face of surface contact iron-core coil and handles.(as Ni-Zn series iron core) generally can directly directly make end face with surface treatment on its body on some high impedance iron cores.If the iron core impedance is low, as Mn-Zn series iron core, can't directly on iron core, make end face, must use other highly-resistant material (as pottery, Ni-Zn series etc.) to make pedestal, and on this pedestal, make end face, just iron-core coil is placed on this pedestal then, and do and suitable make iron-core coil after bonding.

The utility model technology also can be applicable to the end face of chip-type inductance and handles.It comprises series of products such as chip-type inductance, chip-type magnetic bead, chip-type high impedance magnetic bead.Can directly end face be produced on the product, can exempt thus and be stained with the operation of carrying out silver reduction sintering after silver is starched.Because making of silver slurry is to adopt binding agent, silver powder and glass medium, silver reduction sintering utilizes glass medium that iron core and silver foil is bonding, and this interface is afraid of acid liquid medicine, and electroplates acid electroplating often, so this partly has very big quality problems.In the utility model, relevant combination is a principle of utilizing ion interlock or molecule interlock, and is not obvious to acids or the reaction of alkali class liquid medicine, and the close property of its Cause is good than silver foil, and quality will be got well naturally.

As known from the above, the utility model is a kind of iron core filter, owing to improved end face and conductive structure, thus overcome the defective of prior art, reduced magnetic loss, improved performance, available machines used is produced in batches.

Embodiment: according to the utility model filter shown in accompanying drawing 3 and 4, iron core body opening (12) is set on core body (11) and establishes hole wall conductive layer (121) and link to each other, constitute the iron core filter with the conductive layer (21) of both ends of the surface appearance.Conductive layer adopts electro-plating method to generate.

Claims

1, a kind of iron core filter, iron core by the end block formation at core body (11) and its two ends is arranged, it is characterized in that, there is conductive layer (21) on described two end block surfaces and makes this two end block become two termination electrodes (211) and (212), and the conductive coating structure that becomes to be electrically connected with two termination electrodes (211) (212) is arranged on the core body (11).

2, iron core filter according to claim 1 is characterized in that, the conductive coating structure on the described core body (11) is that core body (11) is gone up cored body opening (12), and hole wall conductive layer (121) is arranged on its hole wall.

3, iron core filter according to claim 1 is characterized in that, the conductive coating structure on the described core body (11) is at its outer surface helical form conductive layer (31) to be set.

4, iron core filter according to claim 1 is characterized in that, the conductive coating structure on the described core body (11) is to be covered with conductive layer at core body (11) outer surface.