CN104282412A - Magnetic integrated inductor - Google Patents
Magnetic integrated inductor Download PDFInfo
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- CN104282412A CN104282412A CN201410588797.1A CN201410588797A CN104282412A CN 104282412 A CN104282412 A CN 104282412A CN 201410588797 A CN201410588797 A CN 201410588797A CN 104282412 A CN104282412 A CN 104282412A
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Abstract
The invention relates to a magnetic integrated inductor. The magnetic integrated inductor comprises an upper yoke magnetic core, a lower yoke magnetic core, at least two middle column magnetic cores with windings and at least one high-magnetoconductivity magnetic core, wherein the upper yoke magnetic core and the lower yoke magnetic core are arranged oppositely; the at least two middle column magnetic cores are arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least one high-magnetoconductivity magnetic core is arranged between the upper yoke magnetic core and the lower yoke magnetic core; the at least two middle column magnetic cores, the upper yoke magnetic core and the lower yoke magnetic core form a plurality of first magnetic circuits; the at least one high-magnetoconductivity magnetic core, the upper yoke magnetic core and the lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of each high-magnetoconductivity magnetic core is greater than or equal to 1000; given that the saturation flux density of each of the upper yoke magnetic core and the lower yoke magnetic core is Bs(B), the net sectional area of each magnetic circuit is Ae(B), the saturation flux density of each high-magnetoconductivity magnetic core is Bs(A), and the net sectional area of each magnetic circuit is Ae(A), Ae(A)* Bs(A)<= Ae(B)* Bs(B)*50%.
Description
Technical field
The present invention relates to inductor, especially relate to a kind of magnetic integrated inductor that can suppress common mode current.
Background technology
Realize the parts such as photovoltaic DC-to-AC converter, high power UPS (uninterrupted power supply), motor driving frequency converter that three-phase alternating current inversion exports, the ac converter adopting LC or LCL etc. is needed to export Passive LC filter network in its output power supply circuit, realize the suppression of the dither composition to output current, to reach the requirement to its high order harmonic component exported and grid-connected connection EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility).In order to reduce volume further, reduce the cost of product, the inversion AC inductance of each phase adopts coupling inductance to replace every respective independently single inductance mutually, becomes the important selection of inverter design person.
As shown in Figure 1, for the circuit structure of the typical three-level three-phase inverter of extensive use, wherein have employed the π type AC filter network 120 of LCL, what be connected with the semiconductor switch network 110 of inverter is coupling formula ac converter inductor 121, and what right side was connected with AC network is three phase low frequency (power frequency) filter inductor 123.In order to effectively improve the EMC effect of power supply, ac converter inductor 121 filtering capacitor 122 below, such as adopts wye connection or equivalence to become wye connection, the mid point of its three-phase capacitor, by the form of chassics earth etc., be finally connected capacitor 101 mid point having got back to inverter DC terminal.The output of such inverter 100 just defines a zero-sequence current loop over the ground, has namely occurred the phenomenon that the inductive current sum of each phase of ac converter inductor 121 flowing through three-phase is non-vanishing.
The existence of this zero-sequence current, makes inverter system leakage current over the ground increase, forms security risk time serious; In addition, this electric current is from the capacitor midpoint of inverter, and by high-frequency inverter circuit, ac converter inductor 121, filtering capacitor 122, capacitor 101 mid point finally getting back to DC side forms a current path.This zero-sequence current, only flow in inverter 100 inner loop owing to not exporting, the loss of semiconductor inverter bridge leg, ac converter inductor 121 can be increased the weight of, the operating efficiency of inverter 100 is significantly cut down, also be there will be serious abnormal heating by element such as ac converter inductor 121 grade flowed through.
Therefore, expect to reduce the zero-sequence current in inductor.In addition, zero-sequence current is essentially a kind of common mode current.In other occasions, also there is the demand suppressing other common mode currents.
Summary of the invention
Therefore technical problem to be solved by this invention is to provide a kind of magnetic integrated inductor that can suppress common mode current.
The present invention is that to solve the problems of the technologies described above the technical scheme adopted be a kind of magnetic integrated inductor, comprise the upper yoke magnetic core and lower yoke magnetic core that are oppositely arranged, be located at the center pillar magnetic core of at least two band windings on this between yoke magnetic core and this lower yoke magnetic core, and at least one the high magnetic conductivity magnetic core be located on this between yoke magnetic core and this lower yoke magnetic core, these at least two center pillar magnetic cores and on this yoke magnetic core and lower yoke magnetic core form multiple first magnetic circuit, this at least one high magnetic conductivity magnetic core and on this yoke magnetic core and lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of this high magnetic conductivity magnetic core is more than or equal to 1000, and establish on this, the saturation flux density of lower yoke magnetic core is Bs (B), magnetic circuit net sectional area is Ae (B), the saturation flux density of this high magnetic conductivity magnetic core is Bs (A), magnetic circuit net sectional area is Ae (A), then Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 50%.
In one embodiment of this invention, Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 10%.
In one embodiment of this invention, the quantity of this center pillar magnetic core is 2-3.
In one embodiment of this invention, the material of this center pillar magnetic core is silicon steel sheet, amorphous magnetic core, ferrite, iron silicon or iron sial.
In one embodiment of this invention, this center pillar magnetic core comprises non-magnetic air gap.
In one embodiment of this invention, this high magnetic conduction magnetic core and on this yoke magnetic core and on this yoke magnetic core contact-making surface between combine closely, make this second magnetic circuit substantially not comprise air gap.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, by choosing the material of the high magnetic conductivity using minute quantity, can suppress the generation of common mode current in inductor, avoiding bringing various adverse consequences to inverter, inductor.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 illustrates tri-level inversion and typical output filter circuit thereof.
Fig. 2 illustrates conventional coupling inductor structure.
Fig. 3 illustrates the magnetic integrated form coupling inductor structure of one embodiment of the invention.
Fig. 4 illustrates the magnetic integrated form coupling inductor principle of equal effects schematic diagram of one embodiment of the invention.
Fig. 5 A-5D illustrates various example of the present invention.
Fig. 6 illustrates another embodiment of the present invention magnetic integrated form coupling inductor structure.
Embodiment
The example arrangement of magnetic integrated inductor of the present invention will be described below.
As a comparison, illustrate the representative structure of the coupling ac converter inductor of the routine of Fig. 2.Shown in first reference diagram 2, inductor 200 comprises the upper yoke magnetic core 201 and lower yoke magnetic core 202 that are oppositely arranged and 3 the center pillar magnetic cores 203 be located between yoke magnetic core 201 and lower yoke magnetic core 202.Each center pillar magnetic core 203 forms multiple first magnetic circuit with upper yoke magnetic core 201 and lower yoke magnetic core 202.Each center pillar magnetic core 203 is arranged with winding wire bag 204.The material of upper and lower yoke magnetic core 201,203 and center pillar magnetic core 203 can be the various soft magnetic materials such as silicon steel sheet, amorphous magnetic core, ferrite, iron silicon, iron sial.If center pillar magnetic core 203 adopts ferrite, silicon steel sheet, the contour magnetic conductive material of amorphous band, in order to avoid the big current saturated phenomenon of inductance, the center pillar core portion of each winding wire bag 204 must adopt single or multiple non-magnetic air gaps 205; If center pillar magnetic core 203 adopts and lowly leads powder core (as iron silicon magnetic core, sendust core etc.), then these air gaps can diminish or remove.
Fig. 3 illustrates the magnetic integrated form coupling inductor structure of one embodiment of the invention.Shown in figure 3, inductor 300 comprise be oppositely arranged upper yoke magnetic core 301 and lower yoke magnetic core 302, be located at 3 center pillar magnetic cores 303 between yoke magnetic core 301 and lower yoke magnetic core 302 and be located at 1 high magnetic conductivity magnetic core 304 between yoke magnetic core 301 and lower yoke magnetic core 302.Each center pillar magnetic core 303 forms multiple first magnetic circuit with upper yoke magnetic core 301 and lower yoke magnetic core 302.High magnetic conductivity magnetic core 304 forms second magnetic circuit with upper yoke magnetic core 301 and lower yoke magnetic core 302.Each center pillar magnetic core 303 is arranged with winding wire bag 305.The material of center pillar magnetic core 303 can be the various soft magnetic materials such as silicon steel sheet, amorphous magnetic core, ferrite, iron silicon, iron sial.If center pillar magnetic core 303 adopts ferrite, silicon steel sheet, the contour magnetic conductive material of amorphous band, in order to avoid the big current saturated phenomenon of inductance, the center pillar core portion of each winding wire bag 305 must adopt single or multiple non-magnetic air gaps 306; If center pillar magnetic core 303 adopts and lowly leads powder core (as iron silicon magnetic core, sendust core etc.), then these air gaps can diminish or remove.
Fig. 3, compared with embodiment illustrated in fig. 2, is characterized in adding high magnetic conductivity magnetic core 304, and upper and lower yoke magnetic core 301,302 forms the second magnetic circuit that there is no air gap.That is, between the contact-making surface of high magnetic conductivity magnetic core 304 and upper yoke magnetic core 301, lower yoke magnetic core 302 except the small gap that contact-making surface occurs because of uneven, there is no the air gap that other has a mind to arrange.
For example, the relative permeability of high magnetic conductivity magnetic core 304 is more than or equal to 1000.The relative permeability of upper and lower yoke magnetic core 301,302 is also more than or equal to 1000.The material of high magnetic conductivity magnetic core 304 can be identical with the material of upper and lower yoke magnetic core 301,302, also can be different.
In addition, if the saturation flux density of the material of high magnetic conductivity magnetic core 304 material and upper and lower yoke magnetic core 301,302 is respectively Bs (A), Bs (B), then the effective cross section area A e (A) of high magnetic conductivity magnetic core 304 and upper and lower yoke magnetic core 301,302, the relation of Ae (B) must meet condition: Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 50% below.
In the preferred embodiment, according to the situation of design common mode inductance amount, minimumly even also likely control below 10% by aforementioned 50%, i.e. Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 10%, to realize best product cost.
Fig. 4 illustrates the magnetic integrated form coupling inductor principle of equal effects schematic diagram of one embodiment of the invention.As shown in Figure 4, I (U), I (V), I (W) are respectively the current value flowed through in a certain moment inverter inductor coil, the magnetic flux that they produce inside respective winding center pillar magnetic core is respectively ∮ (U), ∮ (V), ∮ (W), because winding is equidirectional coiling assembling, therefore, magnetic flux flow through direction as shown in Figure 4; The summation of three-phase current is: ∑ I=I (U)+I (U)+I (U), and the magnetic flux that the total magnetic flux that they produce inside magnetic core flows through high magnetic conductivity magnetic core 304 is: ∑ ∮=∮ (U)+∮ (V)+∮ (W).
When inverter three pole reactor current phase balanced, symmetrical, then there is not zero-sequence current, i.e. ∑ I=0, now, ∮ (U)+∮ (V)+∮ (W) is 0, and the magnetic flux flowing through high magnetic conductivity magnetic core 304 is zero, now, whether the existence of high magnetic conductivity magnetic core 304 does not produce any impact to filter circuit, and the integrated three-phase inductor of magnetic of the present embodiment is identical with the three-phase inductor that is coupled conventional Fig. 1 Suo Shi.
Due to reasons such as inverter controls, when causing zero sequence ∑ I ≠ 0, then ∑ ∮ ≠ 0, namely inductance is relative to zero-sequence current, form the flux path of a magnetic flux flow through high magnetic conductivity magnetic core 304 path, due to high magnetic conductivity magnetic core 304, on, lower yoke magnetic core 301, 302 are high magnetic conductivity magnetic material, therefore relative to the inductance coil of each, magnetic flux short circuit is similar to magnetic resistance is minimum on the path beyond the center pillar magnetic circuit of winding, now each winding is by high magnetic conductivity magnetic core 304, on, lower yoke magnetic core 301, 302 constitute independently equivalent common mode inductance.The cause that in each common mode flux road, magnetic resistance is minimum, its common mode inductance amount is very big, even if the common-mode voltage being now applied to each winding coil two ends is higher, its common mode current produced significantly is suppressed, namely ∑ I is very little, thus such induction structure can suppress the generation of zero-sequence current in circuit well.
In addition, zero-sequence current is very little for above-mentioned reasons, conversely again for the control of the effective area of high magnetic conductivity magnetic core 304 provides condition.That is, a distinguishing feature in the embodiment of the present invention is exactly, by choosing the material of the high magnetic conductivity using minute quantity, can eliminate conventional coupling inductor because of the generation of zero-sequence current to the various adverse consequencess that inverter, inductor bring.
On the contrary, conventional coupling inductance, the high magnetic conductivity flux path provided owing to not having high magnetic conductivity magnetic core, once occur ∑ I ≠ 0, the non-vanishing residual flux produced in three winding center pillars, foundation can be forced to release leakage field passage by the air gap of inductance, and magnetic resistance now due to leakage field path (air) of releasing is high, the common mode inductance amount formed for single winding is minimum, cause the sharply rising of zero-sequence current, bring huge loss to inverter, greatly affect the operating efficiency of inverter.
Fig. 5 A-5D illustrates various example of the present invention.Shown in figure 5A-5D, according to above-mentioned principle, the present invention can have multiple example, such as, shown in Fig. 5 A, can between upper and lower yoke magnetic core 301,302 and two band windings center pillar magnetic core 303 between 1 high magnetic conductivity magnetic core 304a is set; As shown in Figure 5 B, between upper and lower yoke magnetic core 301,302 and respectively 2 high magnetic conductivity magnetic core 304b can be set between two center pillar magnetic cores 303 to adjacent band winding; As shown in Figure 5 C, can between upper and lower yoke magnetic core 301,302 and the edge of horizontal direction arranges 2 high magnetic conductivity magnetic core 304c, and high magnetic conductivity magnetic core 304d contacts upper and lower yoke magnetic core 301,302 apparent surface; As shown in Figure 5 C, can between upper and lower yoke magnetic core 301,302 and the edge of horizontal direction arranges 2 high magnetic conductivity magnetic core 304d, and high magnetic conductivity magnetic core 304d contacts the sidewall of upper and lower yoke magnetic core 301,302.
Although what the above embodiment of the present invention described is 3 phase inductor, namely inductor has the center pillar magnetic core of 3 band windings, but according to same principle, embodiments of the invention can expand to single-phase manifold type alternating current-direct current inductance and other multiphase coupled formula alternating current-direct current filter inductances.For example, Fig. 6 illustrates another embodiment of the present invention magnetic integrated form coupling inductor structure, and this inductor only comprises 2 center pillar magnetic cores 603 between upper and lower yoke magnetic core 601,602, and can comprise a high magnetic conductivity magnetic core 604.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (7)
1. a magnetic integrated inductor, comprise the upper yoke magnetic core and lower yoke magnetic core, the center pillar magnetic core being located at least two band windings on this between yoke magnetic core and this lower yoke magnetic core and at least one the high magnetic conductivity magnetic core be located on this between yoke magnetic core and this lower yoke magnetic core that are oppositely arranged, these at least two center pillar magnetic cores and on this yoke magnetic core and lower yoke magnetic core form multiple first magnetic circuit, this at least one high magnetic conductivity magnetic core and on this yoke magnetic core and lower yoke magnetic core form at least one second magnetic circuit, wherein the relative permeability of this high magnetic conductivity magnetic core is more than or equal to 1000, and
If the saturation flux density of this upper and lower yoke magnetic core is Bs (B), magnetic circuit net sectional area is Ae (B), the saturation flux density of this high magnetic conductivity magnetic core is Bs (A), magnetic circuit net sectional area is Ae (A), then Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 50%.
2. magnetic integrated inductor as claimed in claim 1, is characterized in that, Ae (A) × Bs (A)≤Ae (B) × Bs (B) × 10%.
3. magnetic integrated inductor as claimed in claim 1, is characterized in that, the quantity of this center pillar magnetic core is 2-3.
4. magnetic integrated inductor as claimed in claim 1, it is characterized in that, the quantity of this high magnetic conductivity magnetic core is more than 1.
5. magnetic integrated inductor as claimed in claim 1, it is characterized in that, the material of this center pillar magnetic core is silicon steel sheet, amorphous magnetic core, ferrite, iron silicon or iron sial.
6. magnetic integrated inductor as claimed in claim 1, it is characterized in that, this center pillar magnetic core comprises non-magnetic air gap.
7. magnetic integrated inductor as claimed in claim 1, is characterized in that, this high magnetic conduction magnetic core and on this yoke magnetic core and on this yoke magnetic core contact-making surface between combine closely, make this second magnetic circuit substantially not comprise air gap.
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| CN201410588797.1A CN104282412B (en) | 2014-10-28 | 2014-10-28 | Magnetic integrated inductor |
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| CN201410588797.1A CN104282412B (en) | 2014-10-28 | 2014-10-28 | Magnetic integrated inductor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105097222A (en) * | 2015-07-22 | 2015-11-25 | 上海正泰电源系统有限公司 | Magnetic coupling inductor of interleaving parallel converter and magnetic core |
| CN105140004A (en) * | 2015-09-14 | 2015-12-09 | 广东新昇电业科技股份有限公司 | Three-phase metal magnetic powder core reactor for improving magnetic permeability of phase A and phase C |
| CN106057402A (en) * | 2016-08-09 | 2016-10-26 | 华为技术有限公司 | Magnetic integrated inductor and magnetic integrated circuit |
| CN108022716A (en) * | 2016-10-31 | 2018-05-11 | 株式会社田村制作所 | Inductor |
| CN108399994A (en) * | 2017-02-06 | 2018-08-14 | 山东凯通电子有限公司 | Multistage GAP TYPE magnet assembly |
| CN111192746A (en) * | 2018-11-14 | 2020-05-22 | 沃尔缇夫能源系统公司 | Transformer |
Families Citing this family (1)
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| EP4008051A1 (en) | 2019-08-02 | 2022-06-08 | Eaton Intelligent Power Limited | Resonant power converter for wide range voltage switching |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105097222A (en) * | 2015-07-22 | 2015-11-25 | 上海正泰电源系统有限公司 | Magnetic coupling inductor of interleaving parallel converter and magnetic core |
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| CN111192746A (en) * | 2018-11-14 | 2020-05-22 | 沃尔缇夫能源系统公司 | Transformer |
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| CN104282412B (en) | 2017-01-11 |
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