CN103545085A - Double-magnetic-core CM-DM-integrated (common mode-difference mode-integrated) EMI (electro-magnetic interference) filter - Google Patents
Double-magnetic-core CM-DM-integrated (common mode-difference mode-integrated) EMI (electro-magnetic interference) filter Download PDFInfo
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- CN103545085A CN103545085A CN201310529079.2A CN201310529079A CN103545085A CN 103545085 A CN103545085 A CN 103545085A CN 201310529079 A CN201310529079 A CN 201310529079A CN 103545085 A CN103545085 A CN 103545085A
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Abstract
The invention discloses a double-magnetic-core CM-DM-integrated EMI filter. The double-magnetic-core CM-DM-integrated EMI filter is composed of two identical closed magnetic cores and four coils, wherein the two magnetic cores are opposite to each other and arranged in a stack or horizontal mode, and between the two magnetic cores is provided an air gap; CM inductor coils are wound onto the two magnetic cores together, and DM inductor coils are wound onto the two magnetic cores respectively; the closed magnetic core can be in any shape, including the ring shape. The dotted terminal of the first DM inductor coil is connected with the dotted terminal of the first CM inductor coil, and the dotted terminal of the second DM inductor coil is connected with the undotted terminal of second CM inductor coil, so that the integration of DM inductance and CM inductance of the double-magnetic-core EMI filter can be achieved. According to the embodiment of the double-magnetic-core CM-DM-integrated EMI filter, by reasonably selecting the number of turns of the coils and the types of the magnetic cores, the integration of DM inductance and CM inductance can be achieved easily, further good filtering effects and be obtained and the size of the filter can be effectively reduced.
Description
Technical field
The present invention relates to a kind of electromagnetic interface filter, be specifically related to a kind of poor common mode integrated EMI filter of bimag.
Background technology
The developing direction of electronic circuit is towards high frequency, integrated, small light, high power density development.Electromagnetic interface filter is as the reliable passive component of economy of effective blocking-up Conducted Electromagnetic Interference delivering path, and the developing direction of electronic circuit has proposed requirements at the higher level to it.
At present, electromagnetic interface filter is mostly all by independently differential mode inductance device, common-mode inductor and poor common mode capacitance etc. form.Some poor common mode integrated inductors adopt special shape magnetic core, or utilize special magnetic sheet, magnetic stripe and the special magnetic circuit of conventional magnetic core composite construction, or surpass two above magnetic core combinations, and this is restricting design versatility and the device miniaturization of integrated EMI filter.。
Summary of the invention
In order to address the above problem, the object of this invention is to provide a kind of integrated poor common mode EMI filters of common magnetic core that uses, provide especially a kind of bimag integrated poor common mode EMI filters.
The technical solution adopted for the present invention to solve the technical problems is:
A poor common mode integrated EMI filter, by two identical magnetic cores and four coils, formed, described magnetic core is closed magnetic core.Two closed magnetic core horizontal positioned, or stack up and down; Between described two magnetic cores, leave air gap.Two common mode inductance coils are altogether on two magnetic cores, and when coiling direction will guarantee that common mode current passes through, the flow direction that two coils produce is identical; Two differential mode inductance coils respectively on two magnetic cores, when coiling direction will guarantee that differential-mode current is passed through, two flow direction opposite directions in common mode inductance coil that differential mode inductance coil produces in the magnetic core being wound around separately.The terminal of the same name of first differential mode inductance coil and the Same Name of Ends sub-connection of first common mode inductance coil; The terminal of the same name of second differential mode inductance coil is connected with the different name terminal of second common mode inductance coil.
It is integrated that the present invention uses the closed magnetic core of the various shapes that comprise toroidal core to realize poor common mode inductance, do not need to utilize special core structure magnetic circuit, utilize the poor designs common mode integrated EMI filter easily that coordinates of the cooperation of the number of turn and magnetic core size and core material magnetic permeability size.Adopt two integrated poor common mode inductances of magnetic core further to reduce the volume of electromagnetic interface filter.
Accompanying drawing explanation
Fig. 1 is the structural representation of the poor common mode integrated EMI filter of the bimag of toroidal core;
Fig. 2 is the connection layout that the poor common mode integrated EMI filter of bimag and differential mode suppress electric capacity and common mode inhibition electric capacity.
Embodiment
Below in conjunction with 1 pair of technical scheme of the present invention of accompanying drawing, be described in further detail, but the present invention is not limited to this embodiment of accompanying drawing toroidal core, the closed magnetic core of the various shapes that may comprise within the scope of claims has been contained in the present invention.
A poor common mode integrated EMI filter, by two identical magnetic cores and four coil Lc1, Lc2, Ld1, Ld2, formed, described magnetic core is annular closed magnetic core 101.
The terminal Bd1 of first differential mode inductance coil Ld1 is connected with the terminal Bc1 of first common mode inductance coil Lc1; The terminal Bd2 of second differential mode inductance coil Ld2 is connected with the terminal Bc2 of second common mode inductance coil Lc2.Terminal Ad1 and Ad2 form a port of poor common mode integrated EMI filter; Terminal Ac1 and Ac2 form another port of poor common mode integrated EMI filter.
Differential mode suppresses the port that capacitor C x two ends are connected on Ad1 and Ad2 formation, and common mode inhibition Cy1 and Cy2 electric capacity difference 2 are between terminal Ac1 and Ac2 and ground.
Claims (3)
1. a poor common mode integrated EMI filter for bimag, is characterized in that: comprise that two identical magnetic cores and four coils form; Described magnetic core is closed magnetic core; Between described two magnetic cores, leave air gap; Two common mode inductance coils altogether on two magnetic cores, two differential mode inductance coils respectively on two magnetic cores, the terminal of the same name of first differential mode inductance coil and the Same Name of Ends sub-connection of first common mode inductance coil; The terminal of the same name of second differential mode inductance coil is connected with the different name terminal of second common mode inductance coil.
2. the magnetic core of the poor common mode integrated EMI filter of the bimag as described in right 1 requirement is the closed magnetic core that comprises all shapes of toroidal core.
3. the winding of the poor common mode integrated EMI filter of the bimag as described in right 1 requirement comprises that various enamel covered wires, insulation flat copper wire, dielectric film cover Copper Foil, PCB Copper Foil winding etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310529079.2A CN103545085A (en) | 2013-11-01 | 2013-11-01 | Double-magnetic-core CM-DM-integrated (common mode-difference mode-integrated) EMI (electro-magnetic interference) filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310529079.2A CN103545085A (en) | 2013-11-01 | 2013-11-01 | Double-magnetic-core CM-DM-integrated (common mode-difference mode-integrated) EMI (electro-magnetic interference) filter |
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| Publication Number | Publication Date |
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| CN103545085A true CN103545085A (en) | 2014-01-29 |
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| CN201310529079.2A Pending CN103545085A (en) | 2013-11-01 | 2013-11-01 | Double-magnetic-core CM-DM-integrated (common mode-difference mode-integrated) EMI (electro-magnetic interference) filter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104347A (en) * | 2014-06-23 | 2014-10-15 | 南京航空航天大学 | Inter-element low-coupling EMI filter |
| CN106856140A (en) * | 2015-12-09 | 2017-06-16 | 乐金电子研发中心(上海)有限公司 | The common mode differential mode integrated inductor of bimag spatially interlaced arrangement |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
| CN109920619A (en) * | 2019-01-31 | 2019-06-21 | 张欣 | The method for helping silicon carbide MOSFET in parallel to realize current balance using differential mode inductance |
| CN111415810A (en) * | 2020-04-17 | 2020-07-14 | 北京中科宇航技术有限公司 | Differential-common mode integrated choke coil |
| CN111724969A (en) * | 2020-06-29 | 2020-09-29 | 安徽博微新磁科技有限公司 | Inductor |
| CN114974833A (en) * | 2022-07-27 | 2022-08-30 | 四川虹锐电工有限责任公司 | Differential mode common mode magnetic shielding integrated choke coil |
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| JP2004207729A (en) * | 2002-12-20 | 2004-07-22 | Minebea Co Ltd | Coil structure of variable inductance |
| CN201122487Y (en) * | 2007-12-07 | 2008-09-24 | 辽宁工程技术大学 | Array type non-DC magnetic biasing integration magnetic member |
| CN202275687U (en) * | 2011-09-21 | 2012-06-13 | 艾默生网络能源有限公司 | Difference and common module integrated inductor and electromagnetic interference (EMI) filter |
| CN203218059U (en) * | 2013-04-09 | 2013-09-25 | 宁波锦浪新能源科技有限公司 | Electromagnetic compatibility (EMC) filter integrated with common mode choke and differential mode chokes |
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2013
- 2013-11-01 CN CN201310529079.2A patent/CN103545085A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004207729A (en) * | 2002-12-20 | 2004-07-22 | Minebea Co Ltd | Coil structure of variable inductance |
| CN201122487Y (en) * | 2007-12-07 | 2008-09-24 | 辽宁工程技术大学 | Array type non-DC magnetic biasing integration magnetic member |
| CN202275687U (en) * | 2011-09-21 | 2012-06-13 | 艾默生网络能源有限公司 | Difference and common module integrated inductor and electromagnetic interference (EMI) filter |
| CN203218059U (en) * | 2013-04-09 | 2013-09-25 | 宁波锦浪新能源科技有限公司 | Electromagnetic compatibility (EMC) filter integrated with common mode choke and differential mode chokes |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104347A (en) * | 2014-06-23 | 2014-10-15 | 南京航空航天大学 | Inter-element low-coupling EMI filter |
| CN106856140A (en) * | 2015-12-09 | 2017-06-16 | 乐金电子研发中心(上海)有限公司 | The common mode differential mode integrated inductor of bimag spatially interlaced arrangement |
| CN106856140B (en) * | 2015-12-09 | 2020-08-04 | 乐金电子研发中心(上海)有限公司 | Common mode and differential mode integrated inductor with double magnetic cores in three-dimensional staggered arrangement |
| CN109617391A (en) * | 2018-12-25 | 2019-04-12 | 西安理工大学 | The switch power supply EMI filter and its design method of stepless controllable rejection ability |
| CN109920619A (en) * | 2019-01-31 | 2019-06-21 | 张欣 | The method for helping silicon carbide MOSFET in parallel to realize current balance using differential mode inductance |
| CN111415810A (en) * | 2020-04-17 | 2020-07-14 | 北京中科宇航技术有限公司 | Differential-common mode integrated choke coil |
| CN111724969A (en) * | 2020-06-29 | 2020-09-29 | 安徽博微新磁科技有限公司 | Inductor |
| CN114974833A (en) * | 2022-07-27 | 2022-08-30 | 四川虹锐电工有限责任公司 | Differential mode common mode magnetic shielding integrated choke coil |
| CN114974833B (en) * | 2022-07-27 | 2022-10-28 | 四川虹锐电工有限责任公司 | Differential mode and common mode magnetic shielding integrated choke coil |
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Application publication date: 20140129 |