CN107659129A - A kind of plate type common mode differential mode magnetic integrated filter - Google Patents

Abstract

The invention discloses a chip-type common-mode differential-mode magnetic integrated filter, which comprises symmetrically arranged left and right magnetic yokes, and a first magnetic column, a second magnetic column and a third magnetic column are connected side by side between the left and right magnetic yokes. The distance between the second magnetic column and the first and third magnetic columns is equal, the first winding is wound on the first magnetic column, the second winding is wound on the third magnetic column, the materials of the first and second windings are the same and The number of winding turns is the same, no wire is wound on the second magnetic column, the two wire ends of the first and second windings are respectively connected to the electrical connection terminals provided on the yoke in the corresponding direction, and the back magnetic core is connected to the left and right yokes The top surface covers the left and right yokes and three sets of magnetic columns. The invention realizes the magnetic integration of the common-mode filter and the differential-mode filter, is applicable to the high-density installation of continuously small and lightweight portable devices, realizes the sharing of most of the magnetic cores and all the coils, and is beneficial to control the height of the product. It is convenient for chip installation and is conducive to magnetic field shielding.

Description

A Chip Common-Mode Differential-Mode Magnetic Integrated Filter

technical field

The invention relates to the field of circuit filters, in particular to a chip-type common-mode differential-mode magnetic integration filter.

Background technique

A single-phase common-mode filter and a differential-mode filter are usually required in the circuit to suppress common-mode interference and differential-mode interference respectively. Existing single-phase common-mode filters usually have four terminals, which can suppress common-mode interference, but have no effect on differential-mode interference; existing differential-mode filters usually have only two terminals, which can suppress differential-mode interference. Interference, but no suppression of common mode interference. Separately setting single-phase common-mode filters and differential-mode filters in the circuit is not conducive to the high-density installation of portable devices that are constantly smaller and lighter, and has disadvantages such as large volume, heavy weight, large loss, and high cost.

SUMMARY OF THE INVENTION The purpose of the present invention is to provide a chip-type common-mode differential-mode magnetic integrated filter to solve the problem of separately setting single-phase common-mode filters and differential-mode filters in circuits in the prior art, which is not conducive to the lightweight requirements of electronic equipment and high The problem of density installation requirements.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A chip-type common-mode differential-mode magnetic integrated filter is characterized in that it includes symmetrically arranged left and right yokes, the left and right yokes have the same structure and are made of high-permeability soft magnetic materials respectively, and the left and right The first magnetic column, the second magnetic column and the third magnetic column are connected side by side between the yokes. The three sets of magnetic columns are straight columns extending straight along the left and right horizontal directions, and the first magnetic column and the third magnetic column are symmetrical to each other. , the second magnetic column is located between the first and third magnetic columns, and the distance between the second magnetic column and the first and third magnetic columns is equal, the first magnetic column and the third magnetic column have the same structure and adopt high magnetic The second magnetic column is made of a high permeability soft magnetic material with an air gap or a low magnetic permeability soft magnetic material without an air gap. The first magnetic column is wound with a first Winding, the second winding is wound on the third magnetic column, the material of the first and second windings is the same and the number of winding turns is the same, no wire is wound on the second magnetic column, and the two wire ends of the first and second windings are respectively connected to the The electrical connection terminals set on the corresponding direction yoke also include the back core, which is made of soft magnetic material with high magnetic permeability, and the back core is connected to the top surface of the left and right yokes and covers the left and right yokes. A yoke and three sets of magnetic columns.

The chip-type common-mode and differential-mode magnetic integration filter is characterized in that: the left magnetic yoke and the right magnetic yoke are both rectangular plate structures or elliptical plate structures.

The chip-type common-mode differential-mode magnetic integrated filter is characterized in that: the first magnetic column and the third magnetic column are square-section cylindrical structures, or circular-section cylindrical structures, or elliptical cross-section columns shaped structure.

The above-mentioned chip-type common-mode differential-mode magnetic integration filter is characterized in that: the second magnetic column is a square plate structure.

The chip-type common-mode differential-mode magnetic integrated filter is characterized in that: the first winding and the second winding are enamelled copper wires, or enamelled aluminum wires, or flat copper wires, or flat aluminum wires Wire.

The chip-type common-mode differential-mode magnetic integrated filter is characterized in that: the left magnetic yoke and the right magnetic yoke are respectively plated with metal materials to form pad structures, and the pad structures are used as electrical connection terminals.

In the present invention, when the common-mode current flows in, the back magnetic core, the left magnetic yoke, the right magnetic yoke, the first magnetic column and the third magnetic column in the chip-type common-mode differential-mode magnetic integrated filter play a major role. The core adopts high magnetic permeability material and contributes a large common mode inductance.

In the present invention, when the differential mode current flows in, the magnetic circuit formed by the left magnetic yoke, the right magnetic yoke, the first magnetic column, the second magnetic column and the third magnetic column in the chip common mode differential mode magnetic integrated filter starts The main function is that the second magnetic column has a relatively low effective permeability and has a strong ability to resist current saturation, which contributes a large differential mode inductance.

Compared with the prior art, the beneficial effects of the present invention are reflected in:

1. The present invention realizes the magnetic integration of the common-mode filter and the differential-mode filter, which is applicable to the high-density installation of continuously small and lightweight portable equipment, and solves the problem that existing equipment usually uses a common-mode filter and a differential-mode filter The disadvantages of large volume, heavy weight, and high cost are that the common-mode interference and differential-mode interference are suppressed respectively.

2. The present invention realizes the magnetic integration of the common-mode filter and the differential-mode filter. Compared with the conventional equipment that usually uses a common-mode filter and a differential-mode filter to suppress the common-mode interference and differential-mode interference respectively, the magnetic Most of the cores are shared, and all the coils are shared, which saves the magnetic core and copper wire, and reduces the magnetic loss and copper loss.

3. The electrical connection terminals of the common-mode and differential-mode magnetic integrated filter of the present invention are pad structures formed by electroplating metal materials on the left and right yokes, which is beneficial to control the height of the product and facilitate chip installation.

4. In the common-mode and differential-mode magnetic integrated filter of the present invention, the left magnetic yoke, the right magnetic yoke, the first magnetic column, the second magnetic column, and the third magnetic column are covered with a back magnetic core, which reduces magnetic flux leakage and is beneficial to the magnetic field shield.

Description of drawings

Fig. 1 is a front view of the structure of the present invention.

Fig. 2 is a bottom view of the structure of the present invention.

Detailed ways

As shown in Figure 1, a chip-type common-mode differential-mode magnetic integrated filter includes symmetrically arranged left and right yokes 2 and 3, and the left and right yokes 2 and 3 have the same structure and respectively adopt high-permeability soft Made of magnetic material, the first magnetic column 4, the second magnetic column 5 and the third magnetic column 6 are connected side by side between the left and right yokes 2 and 3, and the three groups of magnetic columns 4, 5, and 6 are respectively horizontal along the left and right sides. A straight column extending in a straight line, wherein the first magnetic column 4 and the third magnetic column 6 are symmetrical to each other, the second magnetic column 5 is located between the first and third magnetic columns 4, 6, and the second magnetic column 5 and the first , The spacing between the third magnetic columns 4 and 6 is equal, the first magnetic column 4 and the third magnetic column 6 have the same structure and are made of soft magnetic materials with high magnetic permeability respectively, and the second magnetic column 5 is made of an air-gapped Made of soft magnetic material with high magnetic permeability or soft magnetic material with low magnetic permeability without air gap, the first winding 7 is wound on the first magnetic column 4, the second winding 8 is wound on the third magnetic column 6, and the second winding 8 is wound on the third magnetic column 6. 1. The materials of the second windings 7 and 8 are the same and the number of winding turns is the same. There is no winding on the second magnetic column 5. The two wire ends of the first and second windings 7 and 8 are respectively connected to the yokes 2 and 3 in the corresponding directions. The electrical connection terminal 9 provided on the top is connected, and also includes the back magnetic core 1, which is made of high magnetic permeability soft magnetic material, and the back magnetic core 1 is connected to the top surfaces of the left and right yokes 2 and 3 and covers them. Left and right magnetic yokes 2, 3 and three sets of magnetic columns 4, 5, 6.

The left magnetic yoke 2 and the right magnetic yoke 3 both have a rectangular flat plate structure or an oval flat plate structure.

Both the first magnetic pillar 4 and the third magnetic pillar 6 are of a square cross-section cylindrical structure, or a circular cross-sectional cylindrical structure, or an elliptical cross-sectional cylindrical structure.

The second magnetic column 5 is a square plate structure.

Both the first winding 7 and the second winding 8 are enamelled copper wires, or enamelled aluminum wires, or flat copper wires, or flat aluminum wires.

The left magnetic yoke 2 and the right magnetic yoke 3 are respectively plated with metal materials to form pad structures, and the pad structures are used as electrical connection terminals 9 .

Claims (6)

1. A kind of 1. plate type common mode differential mode magnetic integrated filter, it is characterised in that：Including symmetrically arranged left and right yoke, left and right magnetic Yoke structure is identical and high magnetic permeability soft magnetic materials is respectively adopted is made, and is connected with the first magnetic pole, second between left and right yoke side by side Magnetic pole and the 3rd magnetic pole, three groups of magnetic poles are respectively along the linearly extended right cylinder in left and right horizontal direction, wherein the first magnetic pole and the 3rd Magnetic pole is symmetrical, and the second magnetic pole is between the first, the 3rd magnetic pole, and spacing between the second magnetic pole and the first, the 3rd magnetic pole Equal, the first magnetic pole, the 3rd magnetic pole structure are identical and high magnetic permeability soft magnetic materials is respectively adopted is made, and the second magnetic pole is using being provided with The high magnetic permeability soft magnetic materials of air gap is not opened the low magnetic permeability soft magnetic materials of air gap and is made, be wound with the first magnetic pole first around Group, be wound with the second winding in the 3rd magnetic pole, first, second winding material is identical and number of turns is identical, in the second magnetic pole not around Line, each two line ends are connected first, second winding with the electric connection terminal set in correspondence direction yoke respectively, in addition to the back of the body Portion's magnetic core, back magnetic core are made of high magnetic permeability soft magnetic materials, back magnetic core be connected to left and right yoke top surface and cover it is left, Right yoke and three groups of magnetic poles.
2. A kind of 2. plate type common mode differential mode magnetic integrated filter according to claim 1, it is characterised in that：The left yoke, Right yoke is rectangular flat structure or elliptical plate structure.
3. A kind of 3. plate type common mode differential mode magnetic integrated filter according to claim 1, it is characterised in that：First magnetic Post, the 3rd magnetic pole are square section column construction or circular section column construction or oval cross section column construction.
4. A kind of 4. plate type common mode differential mode magnetic integrated filter according to claim 1, it is characterised in that：Second magnetic pole For square plate structure.
5. A kind of 5. plate type common mode differential mode magnetic integrated filter according to claim 1, it is characterised in that：Described first around Group, the second winding are enamel covered wire or enamel insulated aluminium wire or flat copper wire or flat type aluminum wire.
6. A kind of 6. plate type common mode differential mode magnetic integrated filter according to claim 1, it is characterised in that：The left yoke, Electroplating metal material is distinguished in right yoke and forms pad structure, electric connection terminal is used as using pad structure.