CN2745199Y

CN2745199Y - A power filter

Info

Publication number: CN2745199Y
Application number: CN 200420082145
Authority: CN
Inventors: 施学铭
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-24
Filing date: 2004-08-24
Publication date: 2005-12-07
Anticipated expiration: 2014-08-24

Abstract

The utility model relates to a power filter, in particular to an electromagnetic-interference-proofing power filter with heavy currents, and the power filter is mainly used for the power sources of the equipment, such as televisions, computers, etc. In order to overcome the defects that prior-art filters have small current and power, the utility model provides a filter which is suitable for the heavy current. The power filter is composed of an iron core and a wire shelf, the iron core is composed of two half iron cores, each iron core is in E'-shaped structure, the middle is provided with a crosspiece, and the two half iron cores are respectively arranged on two ends of the wire shelf and are clamped in a recess; The power filter is characterized in that the cross section of the crosspiece in the middle of the iron core matched with the through hole of the wire shelf is rectangular, the cross section of the surrounding frame of the iron core is rectangular too, and the width of the surrounding cross section of the iron core is bigger than the width of the cross section of the crosspiece in the middle of the iron core. The power filter has the advantages that because the area of section of the surrounding frame of the iron core is increased, magnetic flux is increased, magnetic drag is reduced, and the power filter is suitable for the filter with the heavy current.

Description

A kind of power-supply filter

Technical field

The utility model relates to a kind of power-supply filter, especially relates to a kind of power-supply filter of big electric current of anti-electromagnetic interference, is mainly used in the power supply of TV, apparatus such as computer.

Background technology

At present, filter applies is extensive, and its effect mainly is to utilize filter to prevent Electromagnetic Interference and some noises of filtering, so filter is extremely important in the application in each field now.Filter in a kind of alternating-current switch power supply is arranged, referring to Fig. 1, shown in Figure 2, mainly form by iron core 10 and coil holder 11, wherein iron core 10 is made of two and half iron cores, each half iron core is " E " type structure, half iron core of two " E " types is formed the iron core of " day " type, the crosspiece 101 of middle part for being provided with is respectively equipped with two wire casings 110 on the coil holder 11, the two ends of coil holder 11 are respectively equipped with the groove 111 that cooperates with iron core 10 frames, the middle part of groove 111 is provided with the through hole 112 that cooperates with crosspiece 101, two and half iron cores are installed in the two ends of coil holder 11 respectively and are stuck in the groove 111, and crosspiece 101 inserts in the through hole 112 filter that this kind anti electromagnetic wave disturbs, because core section is long-pending less, so magnetic flux is little, magnetic resistance is little, therefore only is applicable to the filter of little electric current, its power is also less relatively, is not suitable for large-scale application.

Summary of the invention

In order to overcome the shortcoming that prior art filter electric current is little, power is little, the utility model provides a kind of filter that is applicable to big electric current.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of power-supply filter, formed by iron core 20 and coil holder 21, described iron core 20 is made of two and half iron cores, each half iron core is " E " type structure, half iron core of two " E " types constitutes the iron core of " day " font, the middle part is provided with crosspiece 201, be respectively equipped with two wire casings 210 on the coil holder 21, the two ends of coil holder 21 are respectively equipped with the groove 211 that cooperates with iron core 20 frames, the middle part of groove 211 is provided with the through hole 212 that cooperates with crosspiece 201, two and half iron cores are installed in the two ends of coil holder 21 respectively and are stuck in the groove 211, and crosspiece 201 inserts in the through hole 212, it is characterized in that: the crosspiece 201 in the middle of the iron core 20 that cooperates with the through hole 212 of coil holder 21, its cross section is a rectangle, the cross section of frame also be a rectangle around the iron core 20, and around the iron core 20 width in cross section greater than the width in crosspieces 201 cross sections, iron core 20 centre.

The utility model has the advantages that: owing to increased the iron core sectional area of frame all around, so magnetic flux increases, magnetic resistance reduces, and is applicable to the filter of big electric current.

Description of drawings

Fig. 1: be the decomposition texture schematic diagram of prior art filter;

Fig. 2: be prior art bank of filters assembling structure schematic diagram;

Fig. 3: be the decomposition texture schematic diagram of the utility model filter;

Fig. 4: be the utility model bank of filters assembling structure schematic diagram;

Fig. 5: be the structural representation of half iron core of the utility model.

Mark in the accompanying drawing is expressed as respectively: 10 iron cores; 11 coil holders; 101 crosspieces; 110 wire casings; 111 grooves; 112 through holes; 20 iron cores; 21 coil holders; 201 crosspieces; 210 wire casings; 211 grooves; 212 through holes.

Specific embodiments

Below in conjunction with accompanying drawing, the utility model is specifically described:

As Fig. 3, shown in 4, a kind of power-supply filter, formed by iron core 20 and coil holder 21, described iron core 20 is made of two and half iron cores, each half iron core is " E " type structure, half iron core of two " E " types constitutes the iron core of " day " font, the middle part is provided with crosspiece 201, be respectively equipped with two wire casings 210 on the coil holder 21, the two ends of coil holder 21 are respectively equipped with the groove 211 that cooperates with iron core 20 frames, the middle part of groove 211 is provided with the through hole 212 that cooperates with crosspiece 201, two and half iron cores are installed in the two ends of coil holder 21 respectively and are stuck in the groove 211, and crosspiece 201 inserts in the through hole 212 crosspiece 201 in the middle of the iron core 20 that cooperates with the through hole 212 of coil holder 21, its cross section is a rectangle, the cross section of frame also is a rectangle around the iron core 20, and key is the width of the width in cross section around its iron core 20 greater than the cross section of crosspiece 201 in the middle of the iron core 20, and the magnetic resistance of electromagnetic circuit is reduced.

But the coiling that the filter selection wire of said structure footpath is bigger also can use Copper Foil, flat wire as coiling; Not only attractive in appearance and strengthen applicable to bigger electric current and bigger power because of its sectional area because of flat coiling.

Claims

1. power-supply filter, formed by iron core (20) and coil holder (21), described iron core (20) is made of two and half iron cores, each half iron core is " E " type structure, half iron core of two " E " types constitutes the iron core (20) of " day " font, the middle part is provided with crosspiece (201), be respectively equipped with two wire casings (210) on the coil holder (21), the two ends of coil holder (21) are respectively equipped with the groove (211) that cooperates with iron core (20) frame, the middle part of groove (211) is provided with the through hole (212) that cooperates with crosspiece (201), two and half iron cores are installed in the two ends of coil holder (21) respectively and are stuck in the groove (211), and crosspiece (201) inserts in the through hole (212), it is characterized in that: the crosspiece (201) in the middle of the iron core (20) that cooperates with the through hole (212) of coil holder (21), its cross section is a rectangle, iron core (20) cross section of frame all around also is a rectangle, and iron core (20) all around the width in cross section greater than the width in crosspiece (201) cross section in the middle of the iron core (20).