CN2602472Y - Filter magnetic core structure - Google Patents
Filter magnetic core structure Download PDFInfo
- Publication number
- CN2602472Y CN2602472Y CN 03229099 CN03229099U CN2602472Y CN 2602472 Y CN2602472 Y CN 2602472Y CN 03229099 CN03229099 CN 03229099 CN 03229099 U CN03229099 U CN 03229099U CN 2602472 Y CN2602472 Y CN 2602472Y
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- magnetic
- filter
- high frequency
- core structure
- magnetic core
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Abstract
The utility model relates to a filter magnetic core structure made of a high frequency magnetic material and consisting of an exterior magnetic loop, a middle flat magnetic cylinder and a cuneiform notch on the middle of the lat magnetic cylinder. The high frequency filter being made from the magnetic core utilizes the magnetic saturation effect to achieve the aim of inductance reducing following the augmentation of working current; as the working current has wide range of variation, the filter can be made as dual filter with common mode and differential mode which has dual filtering effect of common mode and differential mode, and can be used as simplex winding inductance achieving good filtering effect to high frequency pulse electricity; at the same time, the magnetic circuit tending to close has the character of small electromagnetic radiation which is good for weakening the pulse signal disturbing to external. The utility model applying in switch power can effectively improve the electric performance.
Description
Affiliated technical field
The utility model relates to a kind of filter of high-frequency electrical pulses, must use device in the Switching Power Supply, can realize the filtering of variable inductance amount, especially has common mode, the two filter effects of differential mode.
Background technology
At present, Chang Yong high frequency filter has two kinds: based on the closed magnetic circuit filter of double winding common mode filtering and single inductance filter of open-flux path formula, be made of magnetic core and coil two parts.The structures shape of magnetic core, common-mode filter adopts the mode of common mode current magnetic field addition, differential-mode current magnetic field cancellation, a little less than the differential mode filter effect.The part and the open-flux path form of single inductance filter comes with some shortcomings: dispersing pulsed magnetic field easily causes electromagnetic interference; Inductance value is fixed, if export when being connected to variable load, needs to consider work under the big current condition, and inductance value is done lessly, and filter effect is bad when little current work, otherwise just may not provide big electric current; Have again, be presented as that common mode, differential mode filtering can not take into account.
Summary of the invention
For overcome existing high frequency filter filtering performance single, be difficult to adapt to operating current and change occasion significantly, and the heavy problem of electromagnetic interference, the utility model provides a kind of filter core structure, use this core structure can not only accomplish that the paired pulses electricity carries out common mode, differential mode double-smoothing, and can when little current work, present big inductance quantity, when increasing to a certain degree, electric current works in small inductor amount mode again, the current value of inductance of flowing through all can have good filter effect in wide range, the radiation space of electromagnetic interference also can greatly reduce.
The technical scheme that its technical problem that solves the utility model adopts is: in the centre of typical circular magnet ring, increase a flat flux path with same material, its cross-sectional area in the middle of this magnetic circuit, is left two wedge recesses (as Fig. 1) less than the cross-sectional area of magnet ring symmetrically.As altogether, during the differential mode double-smoothing, two coils make common mode magnetic field directly closed on magnet ring around the both sides (as Fig. 4) of circular magnet ring, without middle flat magnetic circuit, newly-increased magnetic circuit is inoperative in the middle of this moment; When coil is flow through in differential-mode current, its magnetic field is through middle magnetic circuit closure, magnetic circuit unsaturation under the little current conditions, magnetic resistance presents for a short time than big inductance quantity, when operating current increases, at first magnetic saturation occurs in the wedge indent, magnetic resistance increases gradually, inductance value reduces gradually, helps providing big current work condition.Magnetic field after the magnetic saturation can be to a large amount of radiation in space, but are limited to the shape of wedge recess, and the magnetic field of radiation can only be confined to very little spatial dimension, thereby can reduce the space electromagnetic interference to greatest extent.When being used for the simplex winding inductor filter, coil can be around on the ring center magnet (as Fig. 5), and outside magnet ring closure can suppressor pulse magnetic field, stops electromagnetic interference; Still have simultaneously the variable inductance graded effect, be fit to classification filtering under the different current values.
The beneficial effects of the utility model are, can realize that differential mode, common-mode filter are integrated; Can be according to the variation of size of current and change the inductance value size automatically; Can suppress the electromagnetic interference that filter inductance causes to greatest extent, simple in structure.
Description of drawings
Fig. 1 is an outside drawing of the present utility model.
Fig. 2 is the utility model two views.
Fig. 3 is that A-A analyses and observe and makes figure.
Fig. 4 is a double winding differential mode filter coiling organigram altogether.
Fig. 5 is a simplex winding filter coiling organigram.
1. magnet ring parts among the figure, 2. flat magnetic post, 3. wedge recess, 4. winding conducting wire.
Embodiment
The utility model can be into a single integrated structure, sees Fig. 1, and core material can be selected suitable high-frequency soft magnetic material for use according to the needs of operating frequency.The size of magnetic core should be decided according to the operating current size.In case of necessity can be at the topped insulating material in magnetic core surface.The maximum cross-section area of its middle magnetic ring middle flat shape magnetic post (2) should be less than the cross-sectional area of magnet ring (1) part.In the middle of this flat magnetic post (2), leave two wedge recesses (3) symmetrically, little near middle place opening size, big more the closer to edge's opening size, be linear change.But must leave keep being communicated with more than 30% of former cross-sectional area in the middle, make the coil working electric current hour, have big as far as possible inductance value.
In embodiment illustrated in fig. 2, as common mode, differential mode double-smoothing.Two groups of coils are by the direction as shown coiling, and two the end of a thread in top are one group and form a pair of port that two the end of a thread in bottom are one group and form another to port, respectively as input/output port.Mutually insulated between lead and magnetic core.
In another embodiment shown in Figure 3, use as the simplex winding inductance filter.Mutually insulated between lead and magnetic core.
Claims (3)
1. high frequency filter core structure, constitute magnetic circuit by outer annular magnetic core, middle flat magnetic post, the employing high-frequency soft magnetic material is made, it is characterized in that: the diameter place of magnet ring sets up flat magnetic circuit (2), a flat magnetic post middle part made from magnetic material of the same race and leaves a pair of acutangulate wedge recess (3), and whole device forms the closed magnetic circuit structure.
2. filter core structure according to claim 1 is characterized in that: wedge recess (3) is opened the outward flange at flat magnetic post middle part, still leaves partially communicating magnetic core array between a pair of wedge recess.
3. filter core structure according to claim 1 is characterized in that whole one-tenth symmetrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229099 CN2602472Y (en) | 2003-02-28 | 2003-02-28 | Filter magnetic core structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03229099 CN2602472Y (en) | 2003-02-28 | 2003-02-28 | Filter magnetic core structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2602472Y true CN2602472Y (en) | 2004-02-04 |
Family
ID=34164701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03229099 Expired - Fee Related CN2602472Y (en) | 2003-02-28 | 2003-02-28 | Filter magnetic core structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2602472Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982968A (en) * | 2012-12-05 | 2013-03-20 | 南京航空航天大学 | Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter |
| WO2018189170A1 (en) | 2017-04-10 | 2018-10-18 | Abb Schweiz Ag | Magnetic adjustment member for multi-phase inductor |
-
2003
- 2003-02-28 CN CN 03229099 patent/CN2602472Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982968A (en) * | 2012-12-05 | 2013-03-20 | 南京航空航天大学 | Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter |
| WO2018189170A1 (en) | 2017-04-10 | 2018-10-18 | Abb Schweiz Ag | Magnetic adjustment member for multi-phase inductor |
| CN110462758A (en) * | 2017-04-10 | 2019-11-15 | Abb瑞士股份有限公司 | Magnetic adjustment component for multiphase inductor |
| CN110462758B (en) * | 2017-04-10 | 2022-01-14 | Abb瑞士股份有限公司 | Magnetic tuning component for multiphase inductors |
| US11636968B2 (en) | 2017-04-10 | 2023-04-25 | Abb Schweiz Ag | Magnetic adjustment member for multi-phase inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040204 |