CN200986840Y - EMC filter inductance with less parasitic parallel capacitance - Google Patents
EMC filter inductance with less parasitic parallel capacitance Download PDFInfo
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- CN200986840Y CN200986840Y CN 200620164727 CN200620164727U CN200986840Y CN 200986840 Y CN200986840 Y CN 200986840Y CN 200620164727 CN200620164727 CN 200620164727 CN 200620164727 U CN200620164727 U CN 200620164727U CN 200986840 Y CN200986840 Y CN 200986840Y
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- filter inductance
- emc filter
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- 230000003071 parasitic effect Effects 0.000 title abstract description 44
- 238000004804 winding Methods 0.000 claims abstract description 104
- 238000001914 filtration Methods 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 9
- 230000004888 barrier function Effects 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 4
- 239000011162 core material Substances 0.000 description 11
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000024241 parasitism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model discloses an EMC filter inductance, include the primary winding that forms by the winding of primary winding wire, still include with the insulated wire of primary winding wire duplex winding. The utility model discloses an EMC filter inductance includes the insulated wire of primary winding line duplex winding, and the effective circle interval between each turn of winding wire just can be effectively controlled through the line footpath of control insulated wire, just can reduce parasitic parallel capacitance Cp effectively because the increase of circle interval.
Description
Technical field
The utility model relates to a kind of EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) filter inductance.
Technical background
In conduction high band and radiation frequency range, common mode disturbances usually is main interference source, thus in electronic product in order to solve the common mode disturbances problem, often need use the common mode filtering circuit, the core of common mode filtering circuit is exactly common mode filtering inductance and Y electric capacity.There is the occasion of shock hazard in Y electric capacity when generally being used in and losing efficacy, therefore electric and Mechanical Reliability has specific (special) requirements to it, has certain limitation to exist to prevent energy hazard again to its capacity simultaneously, and it is higher to safe requirement certainly; Can be divided into Y1, Y2, Y3 and Y4 four classes again according to its rated voltage and the peak voltage grade that can bear.In present patent application, our said Y electric capacity is general reference common mode filtering circuit each line of input that adds for the filtering common mode disturbances of importing that each line links to each other with the earth or casing etc. and the cross-over connection electric capacity between the earth, or the electric capacity of function phase class therewith.
Having that the common mode filtering inductance is commonly used is single-phase, three-phase and type such as heterogeneous, divide from the coiling form, can be divided into two kinds on matrix type and magnet ring type, which kind of coiling form no matter, all exist various parasitic parameters, these parasitic parameters to EMC favourable also have disadvantageous, turn-to-turn coupling capacitance as parasitism, disturb for high band EMC, common mode inductance is because the parasitic shunt capacitance that turn-to-turn coupling produces is quite negative to itself and inductance resonance frequency with the influence of super band, sometimes or even the heel of Achilles of the EMC of a product, so we wish that the parasitic shunt capacitance of inductance is the smaller the better.But because the characteristics of present annular inductance and the restriction of wire winding level, interior ring lead often can't sparsely arrange, and parasitic shunt capacitance just is difficult to reduce.
To sum up, there is following shortcoming in existing filter inductance: parasitic shunt capacitance Cp is bigger, to the noise inhibiting ability generation ten minutes adverse influence of inductance; Parasitic X capacitance is too little, and is unfavorable to the differential mode filter effect.
Summary of the invention
The utility model is exactly in order to solve the problems referred to above of existing EMC filter inductance, to propose a kind of new EMC filter inductance.
For this reason, EMC filter inductance of the present utility model comprises the primary winding that is formed by primary winding wire-wound system, also comprise with described primary winding line and around insulated wire.
Preferably,
Described filter inductance is annular common mode filtering inductance or band matrix type common mode filtering inductance or I-shaped differential mode filter inductance or ring-like differential mode filter inductance.
The magnet ring internal layer of described loop filtering inductance has at least two-layer and is provided with insulating barrier at interlayer.
Primary winding line mutual dislocation in every phase primary winding of described band matrix type common mode filtering inductance, the adjacent primary winding line between the two-phase primary winding of described filter inductance over against.
Described primary winding has one or more, be distributed in one or more layers, between described primary winding and/or primary winding interlayer and/or primary winding be provided with metallic shield ground outward.
Also comprise by insulated conductor and described primary winding line, insulated wire and around the ground connection winding that forms.
Compared with prior art, the beneficial effects of the utility model are as follows:
EMC filter inductance of the present utility model comprise described primary winding line and around insulated wire, just can effectively control effective turn-to-turn distance of each turn-to-turn of winding conducting wire by the line footpath of control insulated wire, because the increase of turn-to-turn distance just can reduce the shunt capacitance Cp of parasitism effectively.
The magnet ring inner stacks of loop filtering inductance of the present utility model is wound with two-layer at least primary winding line, and the interlayer of primary winding line is provided with insulating barrier, and this can further reduce stray inductance shunt capacitance Cp.
For the primary winding line mutual dislocation in every phase winding of band matrix type common mode filtering inductance, the inductance parasitic capacitance in parallel that the primary winding line between two phase windings produces over against lead between the levels that can reduce in every phase winding; Increase the parasitic X capacitance between winding.
Description of drawings
Fig. 1 is a common annular common mode inductance profile;
Fig. 2 is the circuit model schematic diagram that the various parasitic parameters of annular common mode inductance shown in Figure 1 are formed;
Fig. 3 is the graph of a relation of single inductive impedance and inductance value, parasitic parameter;
Fig. 4 is the annular common mode inductance profile of embodiment one;
Fig. 5 is the band matrix type common mode inductance profile of embodiment two;
Fig. 6 is the equivalent circuit diagram of Fig. 4;
Fig. 7 is the annular differential mode inductance profile of embodiment three;
Fig. 8 is the I-shaped differential mode inductance profile of embodiment three.
Embodiment
For the ease of following description, below earlier the operation principle of existing EMC filter inductance is described and its filter effect is analyzed.
As shown in Figure 1, 2, in a kind of parasitic parameter of common annular EMC common mode filtering inductance, the dead resistance Rs1 of ground level, Rs2 are useful to suppressing differential mode and common mode disturbances, certainly Rs1, Rs2 have attenuation too to normal input power supply or signal, can produce certain loss, be to wish that Rs1, Rs2 are the smaller the better in the integrated application.Parasitic shunt capacitance Cp1, Cp2 are very disadvantageous to suppressing common mode and differential mode interference, and they have formed transmission channel to the interference signal of various frequencies, and the inhibitory action of 1 pair of interference signal of inductance L is greatly weakened.On the other hand, parasitic X capacitor C s1 and Cs2 are favourable to suppressing differential mode interference, so we wish that they are the bigger the better.
Fig. 3 is the graph of a relation of single inductive impedance and inductance value, parasitic parameter.As can be seen from Figure 3, if under the constant situation of inductance value, when parasitic shunt capacitance Cp capacity is big more, the resonant frequency point of inductance is just more little, and the impedance maximum point just moves down, and the resistance value behind the resonant frequency point descends thereupon, and the inhibition ability of interference source is descended thereupon.Rs is big more, and the impedance starting point is just high more, and is just strong more to the inhibition ability of interference source.Below we analyze each key element that influences parasitic capacitance in the inductance, we are example with an annular inductance, the toroidal core cross section of supposing inductance is circular, we just can know according to the principle of electric capacity, and the capacity of parasitic capacitance is main relevant with following Several Parameters: the cylindrical diameter of toroidal core, line footpath, turn-to-turn distance, dielectric material characteristic etc. wind the line.Wherein the outer insulating material characteristic of dielectric material characteristic and air, lead coat of paint or other lead is relevant, generally fix, coiling line footpath with flow through the current related of inductance, also should fix; The cylindrical diameter of toroidal core also determines after core material, inductance value and coiling line are directly determined, thus we can change have only the turn-to-turn distance.Under other condition one stable condition, the relation of the size of parasitic capacitance and the cylindrical diameter of toroidal core is: the cylindrical diameter of toroidal core is big more, parasitic capacitance capacity also big more; Under other condition one stable condition, the size of parasitic capacitance with the relation in coiling line footpath is: coiling line footpath is big more, parasitic capacitance capacity also big more; Under other condition one stable condition, the relation of the size of parasitic capacitance and turn-to-turn distance is: turn-to-turn is apart from more little, parasitic capacitance capacity big more.Spacing is much larger than the turn-to-turn distance between two other winding, thus parasitic capacitance Cp too much larger than Cs, this is not that we are desirable.On the other hand, the parasitic Y electric capacity that does not also have us to wish in the top parasitic capacitance exists, and this common mode filtering effect to the common mode filtering inductance is disadvantageous.
Introduce the modified model EMC filter inductance of the utility model on existing EMC filter inductance basis with several embodiments below, its main improvement is: as shown in Figure 4, introduce an insulated wire 2 and winding conducting wire 1 and around, just can effectively control effective turn-to-turn distance of winding conducting wire 1 each turn-to-turn by the line footpath of control insulated wire 2, because the increase of turn-to-turn distance just can reduce parasitic shunt capacitance Cp effectively, the magnet ring internal layer is become two-layer or more multi-layered by one deck in addition, ring lap wound promptly, add certain thickness insulating barrier 4 at interlayer during lap wound, the primary winding line of two interlayers staggers as far as possible mutually, the size of the stray inductance shunt capacitance Cp that produces to reduce to be coupled mutually between the primary winding line, in addition because the raising of the window utilance of magnet ring, average headway between two winding conducting wires reduces, and can increase the parasitic X electric capacity between two windings equally.
As shown in Figure 5, for the inductance of magnetic core matrix type, we can adopt top method to carry out the coiling inductance equally, add an insulated wire and primary winding line and wind to reduce the turn-to-turn parasitic capacitance at each inductance winding; When an inductance primary winding needs coiling two-layer and above, face levels primary winding lead mutually and stagger mutually, to reduce the inductance parasitic capacitance in parallel that lead produces between levels; Face mutually between inductance two primary winding between the upper and lower over against, to increase the parasitic X electric capacity between winding.This makes primary winding wire turn spacing even, can not produce sparse around the time possible winding inter-turn apart from the time little problem when big.
As shown in Figure 6, we analyze as can be known induction structure, for inductance parasitic capacitance Cpa in parallel, Cpb analyzes, the adjacent two circle turn-to-turns of winding conducting wire are not apart from the twice that is generally the coat of paint thickness of lead before improving, 0.4mm lead for example, the coat of paint minimum thickness is generally 0.015mm, pitch is about about 0.05mm, if we adopt the back method of improvement, use as isolating spacing with a insulated wire with the line-transect footpath, pitch is about about 0.5mm, pitch is about original 10 times, under same magnet ring or magnetic core condition, Cpa, Cpb parasitic capacitance capacity is exactly original about 1/5～1/10, and there has been very big change the visible back of improving to the parasitic shunt capacitance of inductance.For parasitic X electric capacity, because the average headway between two winding conducting wires diminishes, X electric capacity is corresponding can be increased.
In sum, improve back each parasitic parameter of inductance and all change towards favourable EMC direction, we wish just for this.
Embodiment one
As shown in Figure 4, a kind of annular common mode filtering inductance comprise primary winding line 1, by the L phase winding and the N phase winding of primary winding line 1 coiled, be positioned at winding interlayer insulating film 4 between winding layers, be positioned at insulating barrier 3 between the winding between L phase winding and N phase winding and with primary winding line 1 and around insulated wire 2.
Embodiment two
As shown in Figure 5, a kind of band matrix type common mode filtering inductance, comprise skeleton 6, the L phase winding 1a and the N phase winding 1b that form on the skeleton 6 by primary winding line 1, be positioned at the winding interlayer insulating film 4 of L phase winding 1a and N phase winding 1b, be positioned at insulating barrier 3 between the winding between L phase winding 1a and N phase winding 1b, be positioned at the outer line encrust insulating barrier 5 of whole primary winding line bag and with primary winding line 1 and around insulated wire 2.
Embodiment three
We can transfer to the above-mentioned method that is used in the common mode inductance in the differential mode inductance and go, and produce a kind of differential mode inductance that has certain common mode filtering ability.
As shown in Figure 7, a kind of annular differential mode filter inductance comprise the primary winding that forms by 1 coiling of primary winding line, with primary winding line 1 and around insulated wire 2.
As shown in Figure 8, a kind of I-shaped differential mode filter inductance comprises I shape magnetic core 7, the primary winding line 1 on the I shape magnetic core 7, with primary winding and around insulated wire 2.
Embodiment four
The difference of this embodiment and above embodiment is: the primary winding of EMC filter inductance has one or more, be distributed in one or more layers, between primary winding and/or primary winding interlayer and/or primary winding be provided with metallic shield ground outward.This metallic shield ground one end links to each other with the earth, and the other end is unsettled.Produce parasitic Y electric capacity by coupling between ground level and winding, thereby further increase parasitic Y electric capacity.
Embodiment five
The difference of this embodiment and above embodiment is: also comprise by insulated conductor and described primary winding line, insulated wire and around the ground connection winding that forms.This ground connection winding one end links to each other with the earth, and the other end is unsettled.Produce parasitic Y electric capacity by coupling between this ground connection winding and primary winding, simultaneously by this ground connection winding the primary winding turn-to-turn apart from increase, just can effectively control effective turn-to-turn distance of each turn-to-turn of winding conducting wire by the line footpath of control insulated conductor, because the increase of turn-to-turn distance just can reduce the shunt capacitance Cp of parasitism effectively; Because the introducing of ground connection winding makes the raising of the window utilance of magnet ring, the average headway between two winding conducting wires reduces, and can increase the parasitic X electric capacity between two windings equally in addition.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; under the prerequisite that does not break away from the utility model design; just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by claims of being submitted to.
Claims (6)
1. an EMC filter inductance comprises the primary winding that is formed by primary winding wire-wound system, it is characterized in that:
Also comprise with described primary winding line and around insulated wire.
2. EMC filter inductance according to claim 1 is characterized in that:
Described filter inductance is annular common mode filtering inductance or band matrix type common mode filtering inductance or I-shaped differential mode filter inductance or ring-like differential mode filter inductance.
3. EMC filter inductance according to claim 2 is characterized in that:
The magnet ring internal layer of described loop filtering inductance has at least two-layer and is provided with insulating barrier at interlayer.
4. EMC filter inductance according to claim 2 is characterized in that:
Primary winding line mutual dislocation in every phase primary winding of described band matrix type common mode filtering inductance, the adjacent primary winding line between the two-phase primary winding of described filter inductance over against.
5. according to claim 1 or 2 or 3 or 4 described EMC filter inductances, it is characterized in that:
Described primary winding has one or more, be distributed in one or more layers, between described primary winding and/or primary winding interlayer and/or primary winding be provided with metallic shield ground outward.
6. according to claim 1 or 2 or 3 or 4 described EMC filter inductances, it is characterized in that:
Also comprise by insulated conductor and described primary winding line, insulated wire and around the ground connection winding that forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620164727 CN200986840Y (en) | 2006-12-13 | 2006-12-13 | EMC filter inductance with less parasitic parallel capacitance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620164727 CN200986840Y (en) | 2006-12-13 | 2006-12-13 | EMC filter inductance with less parasitic parallel capacitance |
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| Publication Number | Publication Date |
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| CN200986840Y true CN200986840Y (en) | 2007-12-05 |
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| CN 200620164727 Expired - Lifetime CN200986840Y (en) | 2006-12-13 | 2006-12-13 | EMC filter inductance with less parasitic parallel capacitance |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295733A (en) * | 2013-04-27 | 2013-09-11 | 昆山禾旺电子有限公司 | Filter |
| CN103440973A (en) * | 2013-07-30 | 2013-12-11 | 西北核技术研究所 | High-energy storage density inductor |
| CN108231342A (en) * | 2016-12-22 | 2018-06-29 | 善元科技股份有限公司 | Common mode inductance device and its method for winding and electromagnetic interference filter circuit |
| CN113439313A (en) * | 2019-02-18 | 2021-09-24 | 利纳克有限公司 | Common mode choke coil |
-
2006
- 2006-12-13 CN CN 200620164727 patent/CN200986840Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103295733A (en) * | 2013-04-27 | 2013-09-11 | 昆山禾旺电子有限公司 | Filter |
| CN103440973A (en) * | 2013-07-30 | 2013-12-11 | 西北核技术研究所 | High-energy storage density inductor |
| CN108231342A (en) * | 2016-12-22 | 2018-06-29 | 善元科技股份有限公司 | Common mode inductance device and its method for winding and electromagnetic interference filter circuit |
| CN113439313A (en) * | 2019-02-18 | 2021-09-24 | 利纳克有限公司 | Common mode choke coil |
| CN113439313B (en) * | 2019-02-18 | 2023-08-29 | 利纳克有限公司 | Common Mode Choke |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: NO. 1, DIALOGGATAN STREET, STOCKHOLM, SWEDEN, SE-141 TO: NO. 1122, AVENUE F, LORAIN CITY, OHIO, THE USA |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110323 Address after: The United States of Ohio city F Lorain Street No. 1122 Patentee after: Emerson Network Power Co., Ltd. Address before: Using lattice SE-141 No. 1 Stockholm street, Sweden Patentee before: Emerson Network Power Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20071205 |
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| EXPY | Termination of patent right or utility model |