CN102982968A - Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter - Google Patents
Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter Download PDFInfo
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- CN102982968A CN102982968A CN2012105139172A CN201210513917A CN102982968A CN 102982968 A CN102982968 A CN 102982968A CN 2012105139172 A CN2012105139172 A CN 2012105139172A CN 201210513917 A CN201210513917 A CN 201210513917A CN 102982968 A CN102982968 A CN 102982968A
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Abstract
The invention relates to a planar integrated EMI choking coil for a planar EMI filter. The planar integrated EMI choking coil comprises a pair of EDT magnetic cores, an outer magnetic ring formed by a pair of I-shaped magnetic cores opposite to each other, and an inner magnetic ring arranged between the EDT magnetic cores and the I-shaped magnetic cores, wherein the inner magnetic ring comprises two PCBs (Printed Circuit Board) which are opposite to each other, and are provided with two ends being in symmetrical ring shapes; ring-shaped through holes are respectively arranged on ring-shaped parts on two ends of a base plate of each PCB; and a protruded piece is arranged on an inner wall of each EDT magnetic core, and sequentially penetrates through the ring-shaped through holes on the two PCBs opposite to the protruded pieces. According to the planar integrated EMI choking coil for the planar EMI filter, the integration of a difference mode inductor and a common mode inductor is realized through two magnetic cores with different magnetic conductivities, independent adjustment of the difference mode inductor and the common mode inductor is realized, the difference mode inductor is effectively increased without affecting characteristics of the common mode inductor, needed components are less, and the processing is simple. The impedance symmetry of an integrated structure is better, the conversion between difference mode noise and common mode noise is effectively prevented, and the filtering effect is good.
Description
Technical field
The present invention relates to a kind of Planar integration EMI choke for planar EMI filter.
Background technology
Electromagnetic interference is take conducted interference as main in the power electronic system at present, and electromagnetic interface filter is the effective means that suppresses such interference.Differential mode and common mode choke are the components that takies whole electromagnetic interface filter volume and weight maximum, and choke integrated is to meet power electronic system miniaturization, integrated development trend.We find by consulting pertinent literature, the integrated of discrete component choke mainly is divided into two kinds: the one, and the large magnet ring of a high magnetic permeability of selecting that professor Yang Yugang of Liaoning engineering science and technology university proposes adds the choke integration mode of two low magnetic permeability beads, the differential mode excitation is lower, magnetic flux is cancelled out each other in the large magnet ring magnetic core, and bead has increased differential mode inductance for magnetic flux provides path; The common mode excitation is lower, because the bead magnetic permeability is lower, main flux is strengthened in large magnet ring mutually, produce larger common mode inductance, but this integrated morphology still needs three toroidal cores, and with respect to the discrete minimizing that there is no, and the magnetic core window utilance is too low; The 2nd, CPES adopts a kind of novel winding method, has only realized just that with two different magnetic cores of magnetic permeability choke is integrated, but poor, common mode inductance independent regulation, but winding is complicated, and obviously increase parasitic the appearance also.The Rengang Chen of Virginia Polytechnic Institute and State University has proposed a kind of choke Planar Integrated Magnetic Structure for the plane filter, and utilize the leakage inductance of common mode inductance to realize differential mode inductance, the insertion of leakage inductance layer can increase differential mode inductance, but also weakened common mode inductance simultaneously, and differential mode inductance is difficult for regulating.
Summary of the invention
For above problem, the present invention proposes a kind of Planar integration EMI choke for planar EMI filter, EMI choke Planar integration new construction, this planar integrated magnetic choke is being realized the integrated of poor, common mode inductance, and do not affect the common mode inductance characteristic when effectively increasing differential mode inductance, what required element was more discrete also lacks, and processing is simple.
The present invention adopts following technical scheme for solving the problems of the technologies described above:
A kind of Planar integration EMI choke for planar EMI filter comprises the outer magnetic ring that relatively is comprised of in twos a pair of EDT magnetic core, a pair of I type magnetic core, and is arranged on the internal magnetic ring between described EDT magnetic core and the I type magnetic core; Wherein said internal magnetic ring comprises that positioned opposite to each other and two ends are first, second pcb board of symmetrical annular, described first, second pcb board forms by substrate, the coil that covers on the substrate, and the ring part at the substrate two ends of first, second pcb board is provided with annular through-hole; Inwall at each EDT magnetic core is respectively arranged with a prodger, and this prodger is the annular through-hole on first, second pcb board relative with it successively; Wherein, the coil that covers on the substrate of described the first pcb board is respectively along the circumference spiral of two annular through-holes at the first pcb board two ends around the home, forms the Crossed Circle helical coil; Its coil has the first port A and the second port C; The coil that covers on the substrate of described the second pcb board is along the continuous formed passage of the periphery of two annular through-holes at the second pcb board two ends around the home, forms the racetrack coil; Its coil has the first port B and the second port D;
Described EMI choke is respectively with the first port B of the first port A of described Crossed Circle helical coil, racetrack coil input port as the EMI choke, with the second port D of the second port C of described Crossed Circle helical coil, racetrack coil output port as the EMI choke;
When the EMI choke flow through common mode current, the magnetic flux that produces in the outer magnetic ring was strengthened mutually, and the magnetic flux that internal magnetic ring produces is cancelled out each other; When the EMI choke flows through differential-mode current, produce magnetic flux in the outer magnetic ring and cancel out each other, the magnetic flux that internal magnetic ring produces is strengthened mutually.
As a kind of optimal technical scheme of the present invention: be lined with partition between the described EDT magnetic core that is oppositely arranged in twos and the I type magnetic core.
As a kind of optimal technical scheme of the present invention: described partition is the scraps of paper or plastic sheet.
As a kind of optimal technical scheme of the present invention: the coil turn of two toroidal helical coil of described Crossed Circle helical coil, the coil turn of racetrack coil are consistent.
As a kind of optimal technical scheme of the present invention: the coil that covers on described first, second pcb board is the Copper Foil coil.
As a kind of optimal technical scheme of the present invention: the substrate of described first, second pcb board adopts epoxide resin material.
As a kind of optimal technical scheme of the present invention: the permeability of the outer magnetic ring of described EMI choke is greater than the permeability of internal magnetic ring.
As mentioned above, the present invention proposes a kind of Planar integration EMI choke for planar EMI filter, this Planar integration EMI choke has been realized the integrated of differential mode inductance and common mode inductance and has been realized independent regulation poor, common mode inductance with two different magnetic cores of magnetic permeability, and do not affect the common mode inductance characteristic when effectively increasing differential mode inductance, what required element was more discrete also lacks, and processing is simple.More discrete also the preponderating of this integrated morphology impedance symmetry effectively prevents conversion poor, common-mode noise, good wave filtering effect.
Description of drawings
Fig. 1 is the structural representation of the EMI choke Planar integration that designs of the present invention.
Fig. 2 is the structural representation of the first pcb board of designing of the present invention.
Fig. 3 is the structural representation of the second pcb board of designing of the present invention.
Fig. 4 A is the magnetic flux coupling schematic diagram under the common mode current that designs of the present invention.
Fig. 4 B is the magnetic flux coupling schematic diagram under the differential-mode current that designs of the present invention.
Fig. 5 is the schematic equivalent circuit of the integrated choke that designs of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated:
Such as Fig. 1, Fig. 2 and shown in Figure 3, the present invention comprises the outer magnetic ring that relatively is comprised of in twos a pair of EDT magnetic core, a pair of I type magnetic core, and is arranged on the internal magnetic ring between described EDT magnetic core and the I type magnetic core; Wherein said internal magnetic ring comprises that positioned opposite to each other and two ends are first, second pcb board of symmetrical annular, described first, second pcb board forms by substrate, the coil that covers on the substrate, and the ring part at the substrate two ends of first, second pcb board is provided with annular through-hole; Inwall at each EDT magnetic core is respectively arranged with a prodger, and this prodger is the annular through-hole on first, second pcb board relative with it successively;
Wherein, the coil that covers on the substrate of described the first pcb board 203 is respectively along the circumference spiral of two annular through-holes at the first pcb board 203 two ends around the home, forms Crossed Circle helical coil 207; Its coil has the first port A and the second port C; The coil that covers on the substrate of described the second pcb board 204 is along the continuous formed passage of the periphery of two annular through-holes at the second pcb board 204 two ends around the home, forms racetrack coil 209; Its coil has the first port B and the second port D; Described EMI choke is respectively with the first port B of the first port A of described Crossed Circle helical coil, racetrack coil input port as the EMI choke, with the second port D of the second port C of described Crossed Circle helical coil, racetrack coil output port as the EMI choke; When the EMI choke flow through common mode current, the magnetic flux that produces in the outer magnetic ring was strengthened mutually, and the magnetic flux that internal magnetic ring produces is cancelled out each other; When the EMI choke flows through differential-mode current, produce magnetic flux in the outer magnetic ring and cancel out each other, the magnetic flux that internal magnetic ring produces is strengthened mutually.
As shown in Figures 2 and 3, the first pcb board 203 is made of the double-spiral coil 207 that links together and epoxy resin 208, and this pcb board is covered with double-spiral coil take epoxy resin as substrate on the upper strata of epoxy resin, and the bottom of epoxy resin is not made change.The second pcb board 204 is made of racetrack Copper Foil coil 209 and epoxy resin 210, and this pcb board is covered with racetrack Copper Foil coil take epoxy resin as substrate on the upper strata of epoxy resin, and the bottom of epoxy resin is not made change.By between EDT magnetic core facing each other and I type magnetic core, being lined with partition, to reduce magnetic permeability, as between an EDT magnetic core 201 and an I type magnetic core 205, being lined with partition, to reduce the magnetic permeability of an EDT magnetic core 201, between the 2nd ETD magnetic core 202 and the 2nd I type magnetic core 206, be lined with partition, to reduce the magnetic permeability of the 2nd ETD magnetic core 202.Wherein, partition can be for the material approximate with air permeability, such as the scraps of paper or plastic sheet or other lamellas of low magnetic permeability.
For making things convenient for Analysis of Magnetic Circuit, two magnet rings that the present invention becomes magnetic permeabilitys just to differ two ETD magnetic cores equivalences, the outer magnetic ring magnetic permeability is high, and internal magnetic ring is low.Shown in Fig. 4 A, when integrated choke flows through common mode current, produce magnetic flux in the outer magnetic ring
Φ H_CM1With
Φ H_CM2, mutually strengthen; Internal magnetic ring produces magnetic flux
Φ L_CM1With
Φ L_CM2, cancel out each other, put aside leakage flux.When coil turn is consistent, then have:
Shown in Fig. 4 B, when integrated choke flows through differential-mode current, produce magnetic flux in the outer magnetic ring
Φ H_DM1With
Φ H_DM2, cancel out each other; Internal magnetic ring produces magnetic flux
Φ L_DM1With
Φ L_DM2, mutually strengthen.When coil turn is consistent, then have:
As the above analysis, poor, the common mode inductance value of this integrated morphology choke can be similar to given by following formula:
Wherein,
NBe coil turn,
ABe the magnetic core net sectional area,
lBe the average length of magnetic path,
μ 0Be air permeability,
μ R-HBe the magnetic permeability of the 2nd ETD magnetic core 202,
μ R-LBe the magnetic permeability of E the one ETD magnetic core 201, this magnetic permeability has reduced magnetic permeability by filler between ETD magnetic core and I type magnetic core.By regulating
μ R-LThereby can independent regulation differential mode inductance amount
L DM While common mode inductance amount
L CM Not affected by it.The equivalent electric circuit of this integrated choke as shown in Figure 5.
The present invention is subsidized by the postgraduate of Nanjing Aero-Space University Innovation Base (laboratory) open fund.The above has done detailed description to embodiments of the present invention by reference to the accompanying drawings, but the present invention is not limited to above-mentioned execution mode, in the ken that those of ordinary skills possess, can also make a variety of changes under the prerequisite that does not break away from aim of the present invention.
Claims (7)
1. a Planar integration EMI choke that is used for planar EMI filter is characterized in that: comprise the outer magnetic ring that relatively is comprised of in twos a pair of EDT magnetic core, a pair of I type magnetic core, and be arranged on the internal magnetic ring between described EDT magnetic core and the I type magnetic core; Wherein said internal magnetic ring comprises that positioned opposite to each other and two ends are first, second pcb board of symmetrical annular, described first, second pcb board forms by substrate, the coil that covers on the substrate, and the ring part at the substrate two ends of first, second pcb board is provided with annular through-hole; Inwall at each EDT magnetic core is respectively arranged with a prodger, and this prodger is the annular through-hole on first, second pcb board relative with it successively; Wherein,
The coil that covers on the substrate of described the first pcb board (203) is respectively along the circumference spiral of two annular through-holes at the first pcb board two ends around the home, forms Crossed Circle helical coil (207); Its coil has the first port (A) and the second port (C);
The coil that covers on the substrate of described the second pcb board (204) is along the continuous formed passage of the periphery of two annular through-holes at the second pcb board two ends around the home, forms racetrack coil (209); Its coil has the first port (B) and the second port (D);
Described EMI choke is respectively with first port (B) of first port (A) of described Crossed Circle helical coil, the racetrack coil input port as the EMI choke, with second port (D) of second port (C) of described Crossed Circle helical coil, the racetrack coil output port as the EMI choke;
When the EMI choke flow through common mode current, the magnetic flux that produces in the outer magnetic ring was strengthened mutually, and the magnetic flux that internal magnetic ring produces is cancelled out each other; When the EMI choke flows through differential-mode current, produce magnetic flux in the outer magnetic ring and cancel out each other, the magnetic flux that internal magnetic ring produces is strengthened mutually.
2. a kind of Planar integration EMI choke for planar EMI filter according to claim 1 is characterized in that: be lined with partition between the described EDT magnetic core that is oppositely arranged in twos and the I type magnetic core.
3. a kind of Planar integration EMI choke for planar EMI filter according to claim 2, it is characterized in that: described partition is the scraps of paper or plastic sheet.
4. a kind of Planar integration EMI choke for planar EMI filter according to claim 1, it is characterized in that: the coil turn of the coil turn of two toroidal helical coil of described Crossed Circle helical coil (207), racetrack coil (209) is consistent.
5. a kind of Planar integration EMI choke for planar EMI filter according to claim 1, it is characterized in that: the coil that covers on described first, second pcb board is the Copper Foil coil.
6. a kind of Planar integration EMI choke for planar EMI filter according to claim 1 is characterized in that: the substrate employing epoxide resin material of described first, second pcb board.
7. a kind of Planar integration EMI choke for planar EMI filter according to claim 1, it is characterized in that: the permeability of the outer magnetic ring of described EMI choke is greater than the permeability of internal magnetic ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210513917.2A CN102982968B (en) | 2012-12-05 | 2012-12-05 | Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter |
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| CN201210513917.2A CN102982968B (en) | 2012-12-05 | 2012-12-05 | Planar integrated EMI (electro magnetic interference) choking coil for planar EMI filter |
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| CN102982968A true CN102982968A (en) | 2013-03-20 |
| CN102982968B CN102982968B (en) | 2015-03-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733426A (en) * | 2013-12-19 | 2015-06-24 | 中芯国际集成电路制造(上海)有限公司 | Spiral differential inductor |
| CN105185510A (en) * | 2014-06-16 | 2015-12-23 | 胜美达集团株式会社 | Coil component |
| CN108226668A (en) * | 2017-12-07 | 2018-06-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of quick rectification device of power cord conduction transmitting test |
| CN110970694A (en) * | 2019-12-27 | 2020-04-07 | 浙江飞碟汽车制造有限公司 | Direct current end parallel type simplified filter |
Citations (5)
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| US5629661A (en) * | 1995-02-03 | 1997-05-13 | Murata Manufacturing Co., Ltd. | Choke coil for eliminating common mode noise and normal mode noise |
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| CN101206947A (en) * | 2007-11-08 | 2008-06-25 | 浙江大学 | Inductance capacitance integrated structure implemented by flexible circuit board in EMI filter |
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2012
- 2012-12-05 CN CN201210513917.2A patent/CN102982968B/en not_active Expired - Fee Related
Patent Citations (5)
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| US5629661A (en) * | 1995-02-03 | 1997-05-13 | Murata Manufacturing Co., Ltd. | Choke coil for eliminating common mode noise and normal mode noise |
| US5977853A (en) * | 1995-02-03 | 1999-11-02 | Murata Manufacturing Co., Ltd. | Choke coil for eliminating common mode noise and normal mode noise |
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Non-Patent Citations (1)
| Title |
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| 朱叶等: "一种用于差、共模噪声抑制的平面EMI扼流圈", 《电工电能新技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733426A (en) * | 2013-12-19 | 2015-06-24 | 中芯国际集成电路制造(上海)有限公司 | Spiral differential inductor |
| CN105185510A (en) * | 2014-06-16 | 2015-12-23 | 胜美达集团株式会社 | Coil component |
| CN105185510B (en) * | 2014-06-16 | 2017-06-30 | 胜美达集团株式会社 | Coil component |
| CN108226668A (en) * | 2017-12-07 | 2018-06-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of quick rectification device of power cord conduction transmitting test |
| CN110970694A (en) * | 2019-12-27 | 2020-04-07 | 浙江飞碟汽车制造有限公司 | Direct current end parallel type simplified filter |
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| CN102982968B (en) | 2015-03-11 |
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