Integrated inductor
Technical field
The invention belongs to magnet and inductance technical field.
Background technology
Existing inductance has and adopts like EI, and the isostructural magnetic core of EE, these magnetic cores have only a newel, on this newel, are provided with coil, constitute inductance thus.And in filter circuit, often adopt a plurality of inductance to be serially connected in the two-wire, and therefore need use manyly to inductance, cause the quantity of use device to increase naturally; Cumulative volume is big, and the space that occupies is big, because the inductance value of employed inductance is different; For easily manufactured; The manufacturer often is employed in the coil of the different number of turns of coiling on the identical magnetic core, causes inductance all identical in shape, and only therein the coil number of turns of reeling is different.Use this independent one by one inductance component to produce electronic product, increase like the usage quantity that in the production process of filter, will cause inductance component, the operation of processing increases, and makes assembling complicated, and is easy to generate assembling and makes mistakes.
Summary of the invention
First purpose of the present invention is to provide a kind of and supplies a plurality of inductance to concentrate in together, and can form a plurality of independently inductance, and the magnetic core of being convenient to make up.
Second purpose of the present invention is to provide a kind of and forms a plurality ofly, and is separate, is convenient to the integrated inductor of combination results.
For realizing first purpose of the present invention; Described magnetic core comprises a magnet, and described magnet is provided with an end face; Edge in described end face both sides is provided with sidewall; Described end face is provided with at least two post cores that extend out, and the magnetic sheet that can lean against on sidewall and the post core end face maintains magnetic gap between described post core end face and the magnetic sheet.
Utilize above-mentioned magnetic core, can realize second purpose of the present invention, described integrated inductor; Comprise a magnet, described magnet is provided with an end face, is provided with sidewall at the edge of described end face both sides; Described end face is provided with at least two post cores that extend out, and the magnetic sheet that can lean against on sidewall and the post core end face maintains magnetic gap between described post core end face and the magnetic sheet; On each post core, be provided with two-wire and around first coil and second coil; First coil on each post core is connected each other, and second coil on each post core is connected each other, and the two ends of each coil are separately positioned on the pin.
Because end face is provided with sidewall and at least two post cores that extend out, when being wound with coil on the post core, then the magnetic field of this coil generation when energising can form a magnetic circuit at post core, end face and the sidewall at its place.Because all post cores all are arranged on the end face; When being wound with coil on these post cores; The magnetic field that these coils produce when energising has only sub-fraction to utilize end face to pass on other the post core, and most of end face, sidewall and magnetic sheet of can passing through forms a magnetic circuit.Therefore, in magnetic circuit, can form a plurality ofly, and be separate post core, when on each post core, being wound with coil, can form a plurality of independently inductance.
For realizing first purpose of the present invention; Described magnetic core comprises two magnets, and described magnet is provided with an end face; Edge in described end face both sides is provided with sidewall; Described end face is provided with at least two post cores that extend out, and one is arranged on the magnetic sheet that can lean against between two magnets on sidewall and the post core end face, maintains magnetic gap between described post core end face and the magnetic sheet.The difference of this magnetic core and above-mentioned magnetic core is many magnets.Can form than last one times separate post core more than.
Utilize above-mentioned magnetic core, can realize second purpose of the present invention, described integrated inductor; Comprise two magnets, described magnet is provided with an end face, is provided with sidewall at the edge of described end face both sides; Described end face is provided with at least two post cores that extend out, and one is arranged on the magnetic sheet that can lean against between two magnets on sidewall and the post core end face, maintains magnetic gap between described post core end face and the magnetic sheet; On each post core, be provided with two-wire and around first coil and second coil; First coil on each post core is connected each other, and second coil on each post core is connected each other, and the two ends of each coil are separately positioned on the pin.The difference of this integrated inductor and above-mentioned integrated inductor is many magnets.Can form than a last integrated inductor and Duo one times separate inductance number.
If adopt two magnets; Directly make its sidewall and the closing of post core end face form a magnetic core together; The magnetic core that form this moment is than adopting a magnetic core and the magnetic core that magnetic sheet forms, elongated relatively one times of its post core, therefore can be on the post core the twice coil of coiling.So can through various combination, can form the magnetic core of different size according to the production needs to magnet, magnetic sheet, different coils is set in these magnetic cores, be convenient to the integrated inductor of combinations produce all size.
Above-mentioned magnetic core and integrated inductor thereof are provided with sidewall owing to be employed in a plurality of post cores periphery; Therefore sidewall is in order to be trapped among by the post core, and is inevitable along with the post core must increase or increase and correspondingly increases sectional area, makes a plurality of post cores can use the path of sidewall as magnetic loop jointly; Through adopting common side-wall to solve the original sidewall separately of each post core; Reduced volume greatly, because sidewall is arranged on the periphery of post core, this sidewall also has the effect of shielding magnetic radiation.
Description of drawings
The drawing of accompanying drawing is explained as follows:
Fig. 1 is the three-dimensional structure diagram of first embodiment of magnetic core of the present invention.
Fig. 2 is the three-dimensional structure diagram of second embodiment of magnetic core of the present invention.
Fig. 3 is the distribution schematic diagram of the magnetic line of force in magnet between two post cores adjacent among Fig. 1 and 2.
Fig. 4 is the distribution schematic diagram of the magnetic line of force in magnet between two post cores concentric among Fig. 2.
Fig. 5 is the three-dimensional assembly structure figure of first embodiment of integrated inductor of the present invention.
Fig. 6 is the three-dimensional assembly structure figure of another integrated inductor embodiment of adopting among Fig. 5 two magnetic cores and making up.
Fig. 7 is the three-dimensional structure diagram of second embodiment of integrated inductor of the present invention.
Fig. 8 is the three-dimensional assembly structure figure of Fig. 7.
Fig. 9 is Fig. 5,6 circuit interconnect pattern.
Figure 10 is the circuit interconnect pattern of Fig. 7.
Figure 11 is applied in an example circuit figure in the filter circuit for integrated inductor shown in Figure 7.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of magnetic core of the present invention and integrated inductor thereof is done further to detail:
At first narrate magnetic core.
As shown in fig. 1; Magnetic core of the present invention comprises a rectangular-shaped Ferrite 1; Described magnet 1 is provided with a rectangular end face 2, is provided with sidewall 3 at the edge of described end face 2 both sides, and described end face 2 is provided with two post cores 4 that extend out.As required, also can on end face 2, be provided with a plurality of post cores 4 that extend out.The magnetic sheet 5 that can lean against on sidewall 3 and post core 4 end faces maintains magnetic gap 11 between described post core 4 end faces and the magnetic sheet 5.When magnet 1 and magnetic sheet 5 were assembled together, this magnetic core was shown in magnet 1 above among Fig. 4 or following magnet 1 and magnetic sheet 5 formations.
When one of them post core 4 was provided with the coil of energising, the magnetic field of generation represented that with the magnetic line of force shown in the dotted portion among Fig. 3, the magnetic line of force will pass from an end of post core 4, then on the end face 2 to around scatter.Because sidewall 3 shapes become flat, are distributed in the edge of end face 2, therefore can collect the most of magnetic line of force that passes from post core 4 one ends.The distribution of the magnetic line of force in sidewall 3 mainly is distributed in apart from the big sidewall 3 of the near sidewall 3 of this post core 4 and sectional area.Though extend out and another post core 4 is faces from end face 2; And it is approaching with a last described post core 4; But owing to be provided with magnetic gap 11 between another post core 4 and the magnetic sheet 5; This magnetic gap 11 has sizable magnetic resistance with respect to sidewall 3, and the magnetic line of force that a therefore last post core 4 produces only has a part seldom can pass through this post core 4.When the cross-sectional area of both sides sidewall 3 was identical, the distribution of the magnetic line of force in end face 2 mainly concentrated on the post core 4 corresponding sidewalls 3 on one side that produce the magnetic line of force, because corresponding on one side sidewall 3 distance post cores 4 are near, magnetic resistance is little.Another post core 4 is owing to only occupy the sub-fraction area of end face 2; And because the existence of the magnetic gap 11 between post core 4 and the magnetic sheet 5; Magnetic resistance through these post core 4 magnetic circuits is big; Therefore only can collect through the sub-fraction in the magnetic line of force on these end face 2 the right, shown in the dotted portion between two post cores 4 among Fig. 3.Major part in the magnetic line of force on the right forms magnetic loop through magnetic sheet 5 again through the sidewall 3 on the right.So the mutual inductance between two post cores 4 is very little, and the like, the situation of a plurality of post cores 4 also is like this.
Described two sidewalls 3 extend rear wall 6 along end face 2 edge on one side, form holistic half.As shown in Figure 3, at this moment, each the post core 4 in the magnet 1 separately a side have can magnetic conduction the wall sectional area obtain enlarging; Like sidewall 3 and rear wall 6, therefore, after the magnetic line of force in the post core 4 passes from an end; Will penetrate to sidewall 3 along three directions, only have sub-fraction in adjacent post core 4, to penetrate, because sidewall 3 occupies the marginal position at end face 2; Bigger extending space can be arranged, and therefore its sectional area can guide a large amount of magnetic lines of force from sidewall 3 and rear wall 6 processes much larger than the sectional area of post core 4; Thereby avoid directly passing through of the magnetic line of force between the adjacent post core 4, reduce the mutual inductance between the post core 4.
At two coils of two post cores, 4 difference coilings; When being equivalent to two inductance L 1 and being integrated together with L2 magnetic spare; Because influencing each other of the magnetic flux that two post cores are 4; The inductance value of this L1 and L2 is compared with the inductance that two magnetic cores that are separated from each other form can produce certain skew, following through the actual test to 10 sample inductance values:
Project |
L1 inductance value (mH) |
L2 inductance value (mH) |
L1+L2(mH) |
The two is connected in series measured value |
Deviation % |
Sample 1 |
4.763 |
5.015 |
9.778 |
9.413 |
3.88% |
Sample 2 |
4.985 |
4.744 |
9.729 |
9.367 |
3.86% |
Sample 3 |
4.713 |
4.830 |
9.543 |
9.189 |
3.85% |
Sample 4 |
4.876 |
4.748 |
9.624 |
9.260 |
3.93% |
Sample 5 |
4.904 |
4.716 |
9.620 |
9.326 |
3.15% |
Sample 6 |
4.748 |
4.937 |
9.685 |
9.380 |
3.25% |
Sample 7 |
4.830 |
4.877 |
9.707 |
9.377 |
3.52% |
Sample 8 |
4.868 |
4.810 |
9.678 |
9.360 |
3.40% |
Sample 9 |
4.935 |
4.966 |
9.901 |
9.583 |
3.32% |
Sample 10 |
4.960 |
4.982 |
9.942 |
9.638 |
3.15% |
As above test learns that actual deviation and theoretical value L1+L2 (mH) exist metastable error range, but through the fine setting number of turns, still reaches the characterisitic parameter requirement of this filter.Can find out that integrated back inductance produces about 3%~4% variation; Because the error of inductance value was generally 8%-10% when filter was made; So it is less to change influence relatively, and can be through the fine setting winding number of turns near separating magnetic device, the value of the inductance that the magnetic core that promptly is separated from each other forms.
Like Fig. 2, shown in 4; Magnetic core of the present invention can also be to comprise two magnets 1; Described magnet 1 is provided with an end face 2, is provided with sidewall 3 at the edge of described end face 2 both sides, and described end face 2 is provided with at least two post cores 4 that extend out; One is arranged on the magnetic sheet 5 that can lean against between two magnets 1 on sidewall 3 and post core 4 end faces, maintains magnetic gap 11 between described post core 4 end faces and the magnetic sheet 5.
Because magnetic sheet 5 is arranged between two magnets 1.When the post core 4 generation magnetic fields of concentric position in two magnets 1, as shown in Figure 4, the magnetic line of force at first enters into magnetic sheet 5 after passing from an end of post core 4.Because in a magnet 1; Magnetic circuit distance between sidewall 3 and the post core 4 is littler than the distance of the magnetic circuit in another magnet 1; So it mainly is to diffuse to the edge through magnetic sheet 5 to periphery that an end of post core 4 passes the magnetic line of force, gets back to end face 2 by sidewall again, forms a magnetic loop; Shown in doublet loop among Fig. 4, represent that most of magnetic lines of force are in this loop.Shown in single dotted line loop among Fig. 4, expression only has the magnetic line of force of very small amount part to form magnetic loop through post core 4, end face 2 and the sidewall 3 of the concentric position of another magnet 1, and the mutual inductance that this magnetic loop produces is minimum.So this structure can form a plurality of independently inductance, and be convenient to combination.
Then narrate integrated inductor.
As shown in Figure 5, described integrated inductor comprises a magnet 1 as shown in fig. 1; Described magnet 1 is provided with an end face 2, is provided with sidewall 3 at the edge of described end face 2 both sides, and described end face 2 is provided with at least two post cores 4 that extend out; The magnetic sheet 5 that can lean against on sidewall 3 and post core 4 end faces; Maintain magnetic gap 11 between described post core 4 end faces and the magnetic sheet 5, on each post core 4, be provided with two-wire and around first coil 7 and second coil 8, first coil 7 on each post core 4 is connected each other; Second coil 8 on each post core 4 is connected each other, and the two ends of each coil are separately positioned on the pin 9.As shown in Figure 7, T1 is illustrated in first coil 7 and second coil 8 on one of them post core 4, and T2 is illustrated in first coil 7 and second coil 8 on another post core 4.Among Fig. 9 1., 2. ... 6. represent pin 9.
As shown in Figure 6, described integrated inductor comprises two magnets 1 as shown in fig. 1; Described magnet 1 is provided with an end face 2; Edge in described end face 2 both sides is provided with sidewall 3, and described end face 2 is provided with the post core 4 of at least two 4, two magnets 1 of post core that extend out and places relatively respectively with sidewall 3; Can form a magnetic gap 11 between post core 4 and the post core 4; This moment the post core compare with sidewall a magnet increase by one times length, on the post core, be provided with two-wire and around first coil 7 and second coil 8, first coil 7 on each post core 4 is connected each other; Second coil 8 on each post core 4 is connected each other, and the two ends of each coil are separately positioned on the pin 9.As shown in Figure 7, T1 is illustrated in first coil 7 and second coil 8 on one of them post core 4, and T2 is illustrated in first coil 7 and second coil 8 on another post core 4.Among Fig. 9 1., 2. ... 6. represent pin 9.
Like Fig. 7, shown in 8, described integrated inductor comprises two magnets 1 as shown in fig. 1; Described magnet 1 is provided with an end face 2, is provided with sidewall 3 at the edge of described end face 2 both sides, and described end face 2 is provided with at least two post cores 4 that extend out; One is arranged on the magnetic sheet 5 that can lean against between two magnets 1 on sidewall 3 and post core 4 end faces; Maintain magnetic gap 11 between described post core 4 end faces and the magnetic sheet 5, on each post core 4, be provided with two-wire and around first coil 7 and second coil 8, first coil 7 on each post core 4 is connected each other; Second coil 8 on each post core 4 is connected each other, and the two ends of each coil are separately positioned on the pin 9.As shown in Figure 10, T1 is illustrated in first coil 7 on one of them post core 4 and second coil 8 in one of them magnet 1, and T2 is illustrated in first coil 7 on another post core 4 and second coil 8 in this magnet 1.T3 is illustrated in first coil 7 on one of them post core 4 and second coil 8 in another magnet 1, and T4 is illustrated in first coil 7 on another post core 4 and second coil 8 in this magnet 1.Among Figure 10 1., 2. ... 10. represent pin 9.
Described two sidewalls 3 surround a monolithic along end face 2 edge on one side.
Be arranged with coil rack 10 on the described post core 4, described pin 9 is arranged on the coil rack 10, and described first coil 7 and second coil 8 are wound on the coil rack 10.
This integrated inductor uses in filter circuit as shown in Figure 11.