CN203910415U - Differential-common-mode inductor and inverter comprising inductor - Google Patents
Differential-common-mode inductor and inverter comprising inductor Download PDFInfo
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- CN203910415U CN203910415U CN201420289112.9U CN201420289112U CN203910415U CN 203910415 U CN203910415 U CN 203910415U CN 201420289112 U CN201420289112 U CN 201420289112U CN 203910415 U CN203910415 U CN 203910415U
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Abstract
The utility model provides a differential-common-mode inductor and an inverter comprising the inductor, and relates to the technical field of electromagnetic compatibility. The differential-common-mode inductor is characterized in that a magnetic core is clamped in the diameter position of a magnetic ring of the differential-common-mode inductor, the magnetic core separates two windings of the differential-common-mode inductor to be located on two sides of the magnetic core, and the magnetic conductivity of the magnetic ore is at least 10 times that the magnetic ring of the differential-common-mode inductor. By means of the differential-common-mode inductor and the inverter comprising the inductor, cost of the differential-common-mode inductor in the circuit design process can be reduced, space for printing circuit boards is saved, loss of common-mode inductors can be lowered, and efficiency of the inverter is improved.
Description
Technical field
The utility model relates to electromagnetic compatibility technology field, relates in particular to a kind ofly can suppress the poor common mode inductance of differential mode electromagnetic interference and common mode electromagnetic interference and the inverter that contains this inductance simultaneously.
Background technology
At present, in including the power electronic products such as Switching Power Supply, uninterrupted power supply and frequency converter or device, because it is operated on off state, inevitably can produce electromagnetic interference signal, therefore, Electro Magnetic Compatibility (Electro Magnetic Compatibility is called for short EMC) design for power electronic product or device seems particularly important.Wherein, in described electromagnetic Compatibility Design, need the electromagnetic interference (Electromagnetic Interference is called for short EMI) of consideration mainly to comprise: two kinds of conducted interference and radiated interference.Described conducted interference signal comprises: differential mode interference signal and common mode interference signal.These interference signals not only affect the normal work of circuit self, also can enter electrical network in the mode of conduction and radiation, pollute other equipment; Owing to also inevitably there being electromagnetic interference signal in electrical network, affect the normal work of equipment simultaneously, therefore must take corresponding way to suppress these interference signals.
In the design of existing EMC, commonly use common mode inductance and differential mode inductance and respectively common mode interference signal and differential mode interference signal are carried out to filtering.
For common mode inductance, the flow direction that common mode interference signal coil as shown in Figure 1 produces is identical, has the effect of mutual reinforcement, thereby coil common code impedance improves, and common mode current weakens greatly; For common mode inductance, the coil differential-mode current as shown in Figure 2 of differential mode interference signal produces the magnetic flux of opposite direction in magnetic core, and magnetic flux is cancelled out each other, and makes magnetic flux in magnetic core approach zero, and coil inductance is almost nil, so it can not suppress differential mode interference signal.
For differential mode inductance, the flow direction that differential mode interference signal coil as shown in Figure 3 produces is identical, has the effect of mutual reinforcement, thereby the impedance of coil differential mode improves, and differential-mode current weakens greatly.For differential mode inductance, common mode interference signal coil common mode current as shown in Figure 4 produces the magnetic flux of opposite direction in magnetic core, and magnetic flux is cancelled out each other, and makes magnetic flux in magnetic core approach zero, and coil inductance is almost nil, so it can not suppress common mode interference signal.
State in realization common mode inductance and differential mode inductance and respectively common mode interference signal and differential mode interference signal are carried out in the process of filtering, utility model people finds that in prior art, at least there are the following problems:
In prior art, by common mode inductance filtering common mode interference signal, filtering mode relative complex and the cost of differential mode inductance filtering differential mode interference signal are higher, and the space that takies printed circuit board (PrintedCircuitBoard is called for short PCB) is larger.
Utility model content
Embodiment of the present utility model provides a kind of inverter that differs from common mode inductance and contain this inductance, can suppress common mode electromagnetic interference signal and differential mode electromagnetic interference signal simultaneously.For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A poor common mode inductance, comprising: the magnet ring diameter place that magnetic core is connected in to differential mode inductance; Described magnetic core separates two windings of differential mode inductance in its both sides, and described magnetic core magnetic permeability is at least 10 times of described differential mode inductance magnet ring magnetic permeability.
It should be noted that, the material of described magnetic core is: ferrite, or noncrystal, or ultramicro-crystal; The material of the magnet ring of described differential mode inductance is: the powder core that air gap is evenly distributed, or iron silicon core, or iron sial core, or iron nickel molybdenum core, or ferrocart core, or with the FERRITE CORE of air gap.
An inverter, comprising: above-described poor common mode inductance.
A kind of inverter that differs from common mode inductance and contain this inductance that the utility model embodiment provides.The filtering that the utility model is realized common mode interference signal by common mode magnetic circuit and the differential mode magnetic circuit of described formation simultaneously and the filtering of differential mode interference signal, with in prior art, use two inductance, be that common mode inductance carries out filtering to common mode interference signal and differential mode interference signal respectively with differential mode inductance and compares, the utility model only can be realized the filter function of above-mentioned common mode interference signal and differential mode interference signal by a poor common mode inductance, thereby not only can reduce the cost of poor common mode inductance in circuit design process, save printed circuit board space, and can reduce the loss of common mode inductance, improve inverter efficiency.
Accompanying drawing explanation
Fig. 1 be in prior art for common mode inductance, the magnetic circuit schematic diagram of common mode current in toroidal core;
Fig. 2 be in prior art for common mode inductance, the magnetic circuit schematic diagram of differential-mode current in toroidal core;
Fig. 3 be in prior art for differential mode inductance, the magnetic circuit schematic diagram of differential-mode current in toroidal core;
Fig. 4 be in prior art for differential mode inductance, the magnetic circuit schematic diagram of common mode current in toroidal core
A kind of flux path schematic diagram of common mode inductance when differential-mode current is passed through that differ from that Fig. 5 (a) provides for the utility model embodiment;
A kind of flux path schematic diagram of common mode inductance when common mode current passes through that differ from that Fig. 5 (b) provides for the utility model embodiment;
The structural representation of a kind of filter that Fig. 6 provides for the utility model embodiment.
Embodiment
A kind of inverter that differs from common mode inductance and contain this inductance the utility model embodiment being provided below in conjunction with accompanying drawing is described in detail.
As shown in Fig. 5 (a) and 5 (b), be respectively a kind of flux path schematic diagram and the described poor common mode inductance flux path schematic diagram when common mode current pass through of common mode inductance when differential-mode current is passed through that differ from that the utility model embodiment provides;
Described poor common mode inductance comprises: the magnet ring F diameter place that magnetic core E is connected in to differential mode inductance; Differential mode inductance is as shown in Fig. 3 and/or Fig. 4; Described magnetic core E separates two windings of differential mode inductance in its both sides, and described magnetic core E magnetic permeability is at least 10 times of described differential mode inductance magnet ring F magnetic permeability.
On the magnet ring F of differential mode inductance, be tied with two windings 13,24 as Fig. 5 (a) and (b);
The magnet ring F of differential mode inductance adds the magnetic core E that magnetic permeability is higher between two windings as Fig. 5 (a) and (b), because the magnetic permeability of magnetic core E is higher, the magnetic flux that two windings produce is selected this path at first, when differential-mode current is by 1 inflow, by 2 outflows, the magnetic flux that two windings produce in magnetic core E is cancelled each other, and adding of magnetic core E can't impact the inductance value of magnet ring differential mode inductance.And for common-mode signal, because the magnetic permeability of magnetic core E is higher, the magnetic field of two winding common-mode signals is also first to pass through magnetic core E, magnetic field is strengthened, and can play filter action to common-mode signal, on described differential mode inductance magnet ring F, has produced common mode inductance amount.If magnetic core E magnetic permeability is much larger than magnet ring F magnetic permeability, common mode inductance amount is about 1/4th of differential mode inductance amount so.
Specific embodiment, with the differential mode inductance of iron silicon magnet ring coiling, winding 1-240T, winding 3-440 circle, makes poor common mode inductance after adding FERRITE CORE.
Add the differential mode inductance before magnetic core E, by 24 short circuits, measure 1-3, inductance value 3mH, measuring 1-2 inductance value is 3mH/4=0.75mH.
Add after magnetic core E, differential mode inductance amount is constant.For common-mode signal, being equivalent to two numbers of turn is 40, and magnetic circuit is half two inductance in parallels of original differential mode inductance magnetic circuit.Common mode inductance amount is 0.75mH.
It should be noted that, the material of described magnetic core is: ferrite, or noncrystal, or ultramicro-crystal; The material of the magnet ring of described differential mode inductance is: the powder core that air gap is evenly distributed, or iron silicon core, or iron sial core, or iron nickel molybdenum core, or ferrocart core, or with the FERRITE CORE of air gap.
The structural representation of a kind of filter providing for the utility model embodiment as shown in Figure 6; Described filter comprises: above-described poor common mode inductance.
A kind of inverter that differs from common mode inductance and contain this inductance that the utility model embodiment provides.The filtering that the utility model is realized common mode interference signal by common mode magnetic circuit and the differential mode magnetic circuit of described formation simultaneously and the filtering of differential mode interference signal, with in prior art, use two inductance, be that common mode inductance carries out filtering to common mode interference signal and differential mode interference signal respectively with differential mode inductance and compares, the utility model only can be realized the filter function of above-mentioned common mode interference signal and differential mode interference signal by a poor common mode inductance, thereby not only can reduce the cost of poor common mode inductance in circuit design process, save printed circuit board space, and can reduce the loss of common mode inductance, improve inverter efficiency.
The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion by the described protection range with claim.
Claims (3)
1. differ from a common mode inductance, it is characterized in that, comprising: the magnet ring diameter place that magnetic core is connected in to differential mode inductance; Described magnetic core separates two windings of differential mode inductance in its both sides, and described magnetic core magnetic permeability is at least 10 times of described differential mode inductance magnet ring magnetic permeability.
2. poor common mode inductance according to claim 1, is characterized in that, the material of described magnetic core is: ferrite, or noncrystal, or ultramicro-crystal; The material of the magnet ring of described differential mode inductance is: the powder core that air gap is evenly distributed, or iron silicon core, or iron sial core, or iron nickel molybdenum core, or ferrocart core, or with the FERRITE CORE of air gap.
3. an inverter, is characterized in that, comprising: poor common mode inductance as claimed in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420289112.9U CN203910415U (en) | 2014-06-03 | 2014-06-03 | Differential-common-mode inductor and inverter comprising inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420289112.9U CN203910415U (en) | 2014-06-03 | 2014-06-03 | Differential-common-mode inductor and inverter comprising inductor |
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| Publication Number | Publication Date |
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| CN203910415U true CN203910415U (en) | 2014-10-29 |
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| CN201420289112.9U Active CN203910415U (en) | 2014-06-03 | 2014-06-03 | Differential-common-mode inductor and inverter comprising inductor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606899A (en) * | 2015-09-08 | 2016-05-25 | 浙江大学 | Frequency conversion transmission system motor side common code impedance extraction method |
| CN113257531A (en) * | 2021-04-27 | 2021-08-13 | 长城电源技术有限公司 | Magnetic core unit, integrated magnetic core and integrated magnetic core structure |
| DE102022130007A1 (en) | 2022-11-14 | 2024-05-16 | Magnetec Gmbh | MAGNETIC FIELD SENSITIVE ASSEMBLY, INDUCTIVE COMPONENT, METHOD AND USE |
-
2014
- 2014-06-03 CN CN201420289112.9U patent/CN203910415U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606899A (en) * | 2015-09-08 | 2016-05-25 | 浙江大学 | Frequency conversion transmission system motor side common code impedance extraction method |
| CN105606899B (en) * | 2015-09-08 | 2018-08-31 | 浙江大学 | A kind of extracting method of Variable Frequency Drives motor side common code impedance |
| CN113257531A (en) * | 2021-04-27 | 2021-08-13 | 长城电源技术有限公司 | Magnetic core unit, integrated magnetic core and integrated magnetic core structure |
| DE102022130007A1 (en) | 2022-11-14 | 2024-05-16 | Magnetec Gmbh | MAGNETIC FIELD SENSITIVE ASSEMBLY, INDUCTIVE COMPONENT, METHOD AND USE |
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