CN112786286A - Common-differential mode inductor with runway-shaped magnetic cores, power circuit and computer - Google Patents
Common-differential mode inductor with runway-shaped magnetic cores, power circuit and computer Download PDFInfo
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Abstract
The invention discloses a runway-shaped magnetic core common-differential-mode inductor, a power circuit and a computer, wherein the runway-shaped magnetic core common-differential-mode inductor comprises the following components: the runway-shaped nanocrystalline magnetic core is provided with two linear magnetic columns which are oppositely arranged and two arc-shaped magnetic columns which are oppositely arranged, the first inductance coil and the second inductance coil are respectively wound on the two linear magnetic columns, the winding directions of the first inductance coil and the second inductance coil are opposite, and the two arc-shaped magnetic columns are not wound with the inductance coils, so that the differential mode performance of the common differential mode inductance of the runway-shaped magnetic core is improved; meanwhile, the common mode performance of the common-differential mode inductor of the runway-shaped magnetic core is improved by utilizing the good magnetic conductivity of the runway-shaped nanocrystalline magnetic core.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a runway-shaped magnetic core common-differential mode inductor, a power circuit and a computer.
Background
In a switching power supply circuit, for example, a switching power supply of a computer, a common-mode inductor is required to suppress a common-mode electromagnetic interference signal, and an electromagnetic interference signal to a differential mode is also required to be considered, so that a first-stage filtering effect is insufficient, and a good interference suppression effect, that is, a filtering effect, is obtained; two stages of filter circuits need to be arranged, which inevitably increases the size of the switching power supply circuit and affects the miniaturization development of the filter circuits.
Disclosure of Invention
The invention mainly aims to provide a common-mode and differential-mode inductor with a racetrack-shaped magnetic core, aiming at improving the common-mode performance and the differential-mode performance of the common-mode inductor.
In order to achieve the above object, the present invention provides a racetrack-shaped magnetic core common-differential mode inductor, which includes:
the magnetic core comprises a runway-shaped nanocrystalline magnetic core, a magnetic core body and a magnetic core body, wherein the runway-shaped nanocrystalline magnetic core is provided with two linear magnetic columns and two arc magnetic columns which are oppositely arranged;
the first inductance coil and the second inductance coil are respectively wound on the two linear magnetic columns, and the winding directions of the first inductance coil and the second inductance coil are opposite;
and the two arc-shaped magnetic columns are exposed to increase the inductance leakage of the common-differential-mode inductor of the runway-shaped magnetic core.
Optionally, the cross-sectional area of the linear magnetic pillar is equal to the cross-sectional area of the arc-shaped magnetic pillar.
Optionally, the cross section of the linear magnetic pole is rectangular.
Optionally, two of the arc-shaped magnetic columns are semicircular.
Optionally, the racetrack-shaped nanocrystalline magnetic core is made of an iron-based nanocrystalline magnetic material.
Optionally, the racetrack-shaped nanocrystalline core is wound in a laminated shape from a ribbon, and the racetrack-shaped nanocrystalline core has a filling factor of 0.76-0.83.
Optionally, the first inductor winding and the second inductor winding are arranged in a single layer.
Optionally, the first inductance coil and the second inductance coil are flat wires, and are respectively wound around the two linear magnetic columns in a standing manner.
The invention also provides a power circuit which comprises the runway-shaped magnetic core common-differential mode inductor.
The invention also provides a computer comprising the power supply circuit.
According to the technical scheme, the magnetic core is set to be the nanocrystalline magnetic core, and good common mode performance is obtained by utilizing the high magnetic conductivity of the nanocrystalline; this embodiment still sets up the magnetic core shape into runway shape, with first inductance coils and second inductance coils coiling respectively in two the straight line shape magnetism post, and the winding opposite direction of first inductance coils and second inductance coils, so set up, traditional ring nanocrystalline magnetic core compares, the coiling is in the first inductance coils and the second inductance coils of two straight line shape magnetism posts, two arbitrary circles of first inductance coils and second inductance coils are parallel to each other, thereby can effectively reduce the parasitic capacitance of common differential mode, be favorable to promoting runway shape magnetic core common differential mode inductance's high frequency common mode performance. In addition, the two arc-shaped magnetic columns of the runway-shaped nanocrystalline magnetic core are exposed, namely, a coil is not wound, so that leakage of magnetic flux at the arc-shaped magnetic columns is increased, the leakage inductance value of the runway-shaped magnetic core common-differential-mode inductor can be effectively improved, and it needs to be explained that the improvement of the leakage inductance value of the runway-shaped magnetic core common-differential-mode inductor also improves the differential-mode component of the runway-shaped magnetic core common-differential-mode inductor, so that the improvement of the differential-mode filtering performance of the runway-shaped magnetic core common-differential-mode inductor is facilitated. Therefore, the runway-shaped magnetic core common-differential mode inductor has good common-mode performance and good differential-mode performance, so that the runway-shaped magnetic core common-differential mode inductor can replace two traditional filter inductors in a computer power circuit needing to consider common-mode filtering and differential-mode filtering at the same time.
In addition, compared with the traditional circular ring nanocrystalline magnetic core, the coil needs to be wound on the arc side (automatic winding cannot be achieved, manual winding is needed, the consistency is poor, and the efficiency is low).
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a racetrack-shaped core common-differential mode inductor according to the present invention;
FIG. 2 is an equivalent circuit diagram of an embodiment of a racetrack core common-differential mode inductor of the present invention;
FIG. 3 is a front view of an embodiment of a racetrack core common-differential mode inductor of the present invention;
FIG. 4 is a left side view of an embodiment of a racetrack core common-differential mode inductor of the present invention;
fig. 5 is a schematic structural diagram of a racetrack-shaped nanocrystalline magnetic core 10 according to an embodiment of the racetrack-shaped magnetic core common-differential mode inductor of the present invention;
FIG. 6 is a common mode inductance test chart of an embodiment of the racetrack core common-differential mode inductor of the present invention;
FIG. 7 is a graph of differential mode inductance measurements for an embodiment of the racetrack core common differential mode inductor of the present invention;
FIG. 8 is a conduction test chart of an embodiment of the racetrack core common-differential mode inductor of the present invention;
fig. 9 is a radiation test chart of an embodiment of the racetrack core common-differential mode inductor of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Runway-shaped nanocrystalline |
50 | |
| 20 | |
11 | Track- |
| 30 | |
12 | |
| 40 | |
13 | Paint layer |
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a runway-shaped magnetic core common-differential mode inductor which has good common-mode performance and differential-mode performance.
Referring to fig. 1, in one embodiment, the racetrack core common mode inductor includes:
the magnetic core comprises a runway-shaped nanocrystalline magnetic core 10, wherein the runway-shaped nanocrystalline magnetic core 10 is provided with two linear magnetic columns and two arc magnetic columns which are oppositely arranged;
the first inductance coil 20 and the second inductance coil 30 are respectively wound on the two linear magnetic columns, and the winding directions of the first inductance coil 20 and the second inductance coil 30 are opposite;
the two arc-shaped magnetic columns are exposed, namely inductance coils are not wound at the two arc-shaped magnetic columns, so that the inductance leakage of the runway-shaped magnetic core common-differential-mode inductance is increased.
In this embodiment, referring to fig. 2, an equivalent circuit of the racetrack-shaped magnetic core common-mode differential inductor is shown, where LCM is an equivalent common-mode component and LDM is an equivalent differential-mode component.
The runway-shaped nanocrystalline magnetic core 10 may be a flat magnetic core, and a closed magnetic circuit is formed by two linear magnetic columns and two arc magnetic columns; the two arc-shaped magnetic columns can be semicircular and can also be in other shapes, and the embodiment can be semicircular. Specifically, in practical application, the method for manufacturing the racetrack-shaped nanocrystal magnetic core 10 may be to wind the strip into a circular ring, extrude the circular ring into the racetrack-shaped nanocrystal magnetic core 10 by using a special high-temperature-resistant fixture, and specifically, a high-temperature-resistant non-deformable 45# steel bracket may be installed between two straight sides for fixation to prevent the strip from arching and deforming. Referring to fig. 5, a racetrack-shaped jig 11 made of a special alloy magnetic material, such as permalloy, a special ultra-thin iron sheet, or the like, may be used to wind a strip material, i.e., a nanocrystalline layer 12, on the basis of the racetrack-shaped jig 11, so as to obtain the racetrack-shaped nanocrystalline core 10. It should be noted that the diameter of the arc edge and the width of the outer shape (i.e., the distance between the two straight magnetic pole sides) are kept consistent, so that the effect of the equal cross-sectional area at any two positions of the racetrack-shaped nanocrystal magnetic core 10 can be achieved.
The coil can be a flat coil or other types of coils, the winding of the coil can be flat winding or vertical winding, and the winding is not limited here, and the coil can be a flat coil and is wound in a vertical winding mode.
According to the technical scheme, the magnetic core is set to be the nanocrystalline magnetic core, and the common mode inductance of the runway-shaped magnetic core has good common mode performance by utilizing the high magnetic conductivity of the nanocrystalline; in this embodiment, the magnetic core is further configured as a racetrack-shaped magnetic core including two linear magnetic pillars and two arc-shaped magnetic pillars, the first inductance coil 20 and the second inductance coil 30 are respectively wound around the two linear magnetic pillars, and the winding directions of the first inductance coil 20 and the second inductance coil 30 are opposite, so that compared with a traditional toroidal nanocrystalline magnetic core (requiring manual winding and causing an included angle between any two turns of the coil due to winding on the arc-shaped magnetic pillar), any two turns of the toroidal nanocrystalline magnetic core are parallel to each other when wound around the first inductance coil 20 and the second inductance coil 30 of the two linear magnetic pillars, thereby effectively reducing the parasitic capacitance of the racetrack-shaped magnetic core common-differential mode inductor, facilitating improvement of the high-frequency common-mode performance of the racetrack-shaped magnetic core common-differential mode inductor, and in addition, the two arc-shaped magnetic pillars of the racetrack-shaped magnetic core are exposed, i.e. no winding, therefore, magnetic leakage of magnetic flux at the arc-shaped magnetic columns is increased, the leakage inductance value of the runway-shaped magnetic core common-differential-mode inductor can be effectively improved, and it needs to be explained that the improvement of the leakage inductance value of the runway-shaped magnetic core common-differential-mode inductor also improves the differential-mode component of the runway-shaped magnetic core common-differential-mode inductor, so that the improvement of the differential-mode filtering performance of the runway-shaped magnetic core common-differential-mode inductor is facilitated. Therefore, the runway-shaped magnetic core common-differential mode inductor has good common-mode performance and good differential-mode performance, and particularly, in an actual test, in a power circuit needing to consider common-mode filtering and differential-mode filtering at the same time, such as a computer power circuit, the runway-shaped magnetic core common-differential mode inductor can achieve the effect of replacing two traditional filter inductors by virtue of good common-mode performance and differential-mode performance.
In addition, compared with the traditional circular nanocrystalline magnetic core, the coil needs to be wound on the arc side (automatic winding cannot be achieved, manual winding is needed, the consistency is poor, and the efficiency is low).
It should be noted that, for example, to improve the performance of the racetrack-shaped nanocrystal magnetic core 10, the racetrack-shaped nanocrystal magnetic core 10 of the invention adopts a specially-made forming jig (which may be the racetrack-shaped jig made of magnetic materials such as permalloy, special ultra-thin iron sheets, etc., as mentioned above (the coil may be directly wound on the assembly composed of the racetrack-shaped nanocrystal magnetic core 10 and the racetrack-shaped jig without being removed), or may separately design a jig for fixing for user heat treatment (at this time, the ring shape has been pressed into the racetrack shape, the racetrack-shaped nanocrystal magnetic core 10 is sleeved on the separately-designed jig for fixing, and after the treatment is finished, the separately-designed forming jig is taken out), and applies slight pressure to the racetrack-shaped nanocrystal magnetic core 10 to eliminate the mechanical stress during the racetrack-shaped nanocrystal magnetic core 10 winding process, which is favorable for recovering or improving the magnetic properties of the racetrack-shaped nanocrystal magnetic core 10, there are various ways of applying the slight pressure, which is not limited herein, for example, a magnetic force applied to the racetrack-shaped nanocrystal core 10 by a magnetic field, or a mechanical pressure directly applied to the racetrack-shaped nanocrystal core 10.
Further, in order to improve the temperature characteristics of the racetrack-shaped nanocrystalline magnetic core 10, when the racetrack-shaped nanocrystalline magnetic core 10 is subjected to heat treatment, a temperature curve is set according to the characteristics of the material of the racetrack-shaped nanocrystalline magnetic core 10, taking 1K107 iron-based nanocrystalline alloy as an example, the temperature can be kept at 300-420 ℃ as a heat preservation point of the first section of the racetrack-shaped nanocrystalline magnetic core, the temperature is kept at constant temperature for 30-40 minutes, the temperature is kept at constant temperature at 420-480 ℃ as a heat preservation point of the second section of the racetrack-shaped nanocrystalline magnetic core for 60-70 minutes, and the temperature is kept at constant temperature at 480-570 ℃ as a heat. In addition, when the heat treatment is discharged, that is, after the track-shaped nanocrystalline magnetic core 10 is insulated in the third section, the cooling speed of the track-shaped nanocrystalline magnetic core 10 is reduced (rather than being immediately cooled), so as to improve the temperature characteristic of the track-shaped nanocrystalline magnetic core 10.
Meanwhile, in order to prevent the deformation of the nano-crystal magnetic core, the racetrack-shaped nano-crystal magnetic core 10 needs to be further cured by dipping, and then needs to be baked at 120 ℃ for two hours after being cured.
Further, in order to test and verify the performance of the common-differential-mode inductance of the racetrack-shaped magnetic core, in one embodiment, actual production and manufacturing data of the common-differential-mode inductance of the racetrack-shaped magnetic core are provided, and the common-differential-mode inductance of the racetrack-shaped magnetic core produced by the test is tested and the test result is recorded.
First, a rolled and sheared iron-based nanocrystalline strip (1K107 iron-based nanocrystalline strip, 6.5mm wide) is wound into a racetrack-shaped nanocrystalline core 10 by the method described above, with reference to fig. 5, the parameters of the racetrack-shaped nanocrystalline core 10 may be: the inner length is 30.9mm, the inner width is 8.4mm, the outer length is 41.7mm, the outer width is 19.5mm, the runway-shaped nanocrystalline magnetic core 10 is well formed and put into a horizontal furnace for three-section heat treatment, after the heat preservation is finished, the runway-shaped nanocrystalline magnetic core 10 is cooled for a period of time, the runway-shaped nanocrystalline magnetic core 10 is put into a transverse magnetic furnace for transverse magnetic treatment, and the transverse magnetic field is set to 1200 plus 1500 GS.
And then slightly curing, baking for 2H at 120 ℃, testing the performance of the runway-shaped nanocrystalline magnetic core 10, and then spraying and coating to increase the paint layer 13, so as to protect the common-mode inductance of the runway-shaped magnetic core and the insulating runway-shaped nanocrystalline magnetic core, and finally obtaining 10 groups of runway-shaped nanocrystalline magnetic cores 10 which are respectively marked as 1# to 10# in the table. Test data for 10 sets of racetrack-shaped nanocrystalline cores 10 are shown in tables 1 and 2:
the inductance values tested at the test frequencies of 10KHZ and 100KHZ are shown in two L1T of Table 1. Table 1:
table 2: table 2 shows the measured physical dimension parameters of 10 sets of racetrack-shaped nanocrystalline cores 10, where Lin is the inner length of the racetrack-shaped nanocrystalline core 10, Win is the inner width of the racetrack-shaped nanocrystalline core 10, Lout is the outer length of the racetrack-shaped nanocrystalline core 10, and Wout is the outer width of the racetrack-shaped nanocrystalline core 10, with specific reference to fig. 5, where HT is the height of the racetrack-shaped nanocrystalline core 10 (related to the bandwidth of the iron-based nanocrystalline ribbon, not shown in fig. 5).
Further, the 4 racetrack-shaped nanocrystalline magnetic cores 10 are selected at will, the flat enameled wires of 0.40X2.0 specification are adopted to wind the opposite windings of 50TS (the specific winding specification refers to table 3) on the two straight magnetic columns of the racetrack-shaped nanocrystalline magnetic cores 10, then molding is carried out, the bottom plate 40 and the partition plate 50 are installed, and finally, glue dispensing and fixing are carried out. Reference specification parameters of the fixed common mode inductance of the racetrack-shaped magnetic core including the base refer to fig. 3 and 4, wherein the unit is mm, that is, after the inductance coil is included, the outer width of the common mode inductance of the racetrack-shaped magnetic core can be 29mm, the outer length can be 45mm, and MAX in the figure refers to not more than MAX.
N1 in table 3 indicates that the first inductor 20 and N2 indicates that the second inductor 30 are not smaller than MIN and not larger than MAX. Table 3:
further, the manufactured 4 racetrack-shaped core common-differential mode inductances were respectively numbered (1, 2, 3, and 4 in table 4) and subjected to inductance parameter tests and recorded in table 4. Table 4:
as can be seen from the above table, the common-mode and differential-mode electrical sensing inductance value of the racetrack-shaped magnetic core of the invention is stabilized at 140+, and compared with the common-mode inductance (the common differential-mode inductance value is 50) of the same specification, the common-mode and differential-mode inductance of the racetrack-shaped magnetic core of the invention has superior differential-mode performance; meanwhile, the common-mode inductance of the runway-shaped magnetic core common-differential mode inductor in the embodiment is stabilized to be more than 50 at a test frequency of 10KHZ, and is stabilized to be more than 27 at a test frequency of 100 KHZ. The common mode performance is superior.
Further, a common mode inductance-test frequency and an impedance value-test frequency characteristic graph of the racetrack-shaped core common-differential mode inductance in the present embodiment are plotted, referring to fig. 6. In fig. 6, LS on the ordinate indicates inductance, Z indicates impedance, and frequeency indicates the test frequency of the racetrack core common-mode inductance.
Further, a characteristic graph of the differential mode inductance-test frequency and the impedance value-test frequency of the racetrack-shaped core common differential mode inductance in the present embodiment is plotted, referring to fig. 7. In fig. 7, LS on the ordinate indicates inductance, Z indicates impedance, and frequeency indicates the test frequency of the racetrack core common-mode inductance.
In order to further prove the performance of the racetrack-shaped core common-differential-mode inductor in the embodiment, after the racetrack-shaped core common-differential-mode inductor is used for replacing two-stage ferrite common-mode inductors in a computer power supply, a conduction test and a radiation test are carried out, the test results refer to fig. 8 and 9, fig. 8 is a conduction test effect diagram, and fig. 9 is a radiation test effect diagram, and it can be seen from fig. 8 that in the frequency range shown in fig. 8, any read value of a peak frequency spectrum waveform is smaller than a quasi-peak limit value, and any read value of an average frequency spectrum waveform is smaller than an average limit value, i.e. after the racetrack-shaped core common-differential-mode inductor replaces the two-stage ferrite common-mode inductors in the computer power supply, the racetrack-shaped core common-.
It can be seen from fig. 9 that, in the frequency range shown in fig. 9, any read value of the peak waveform of the radiation is lower than the quasi-peak limit value, that is, after a racetrack-shaped magnetic core common-mode inductor replaces a two-stage ferrite common-mode inductor in a computer power supply, the radiation test can be perfectly passed.
In summary, the racetrack-shaped magnetic core common-mode inductor of the embodiment has superior performance, can replace a two-stage ferrite common-mode inductor in a computer power circuit, and is beneficial to reducing cost, saving space, simplifying an EMI filter circuit, reducing loss, improving energy efficiency and improving power density.
Referring to fig. 1 and 5, in an embodiment, a cross-sectional area of the linear magnetic pillar is equal to a cross-sectional area of the arc-shaped magnetic pillar. That is, the cross section of the linear magnetic pole is the same as the cross section of the arc magnetic pole in shape and area.
That is to say, the cross-sectional areas of any two positions of the racetrack-shaped nanocrystal magnetic core 10 are equal, and the cross-sectional areas are equal no matter the magnetic flux flows to any position of the racetrack-shaped nanocrystal magnetic core 10, compared with a conventional magnetic core (for example, an arc-shaped magnetic column is an ellipse, which inevitably causes the cross-sectional area of a certain position to be smaller, such as a rectangular magnetic core, a rectangular right angle position, and the cross-sectional area change is unequal), the racetrack-shaped nanocrystal magnetic core 10 in the embodiment can avoid the problem of magnetic path loss caused by the smaller cross-sectional area of the certain position when the magnetic path of the racetrack-shaped magnetic core common-mode inductor flows through the magnetic path. The cross section of the racetrack-shaped nanocrystal core 10 may be rectangular, polygonal or circular, and is not limited herein.
Further, the cross section of the linear magnetic pole is rectangular.
Further, the two arc-shaped magnetic columns are semicircular.
In the embodiment, the two arc-shaped magnetic columns of the racetrack-shaped nanocrystalline magnetic core 10 are semicircular, so that the two arc-shaped magnetic columns can be aligned on the straight line side of the racetrack-shaped nanocrystalline magnetic core 10, and compared with other shapes, such as an ellipse (the ellipse cannot reach the condition that the cross sections of any two positions are equal), the problem of magnetic circuit loss caused by the circulation of a magnetic circuit can be avoided; because the semicircular arc-shaped magnetic column can be perfectly matched with the linear magnetic column, the design of a closed magnetic circuit is realized, and the impedance balance characteristic is good.
Further, the racetrack-shaped nanocrystalline magnetic core 10 is made of an iron-based nanocrystalline magnetic material.
In this embodiment, the iron-based nanocrystalline magnetic material is not limited, and may satisfy the requirement of magnetic permeability, and may be, for example, 1K107 iron-based nanocrystalline magnetic material.
It can be understood that compared with the traditional ferrite magnetic core, the iron-based nanocrystalline magnetic material has good magnetic conductivity, and is beneficial to effectively improving the common mode performance of the common-differential mode inductance of the racetrack-shaped magnetic core.
Referring to fig. 5, in one embodiment, the racetrack-shaped nanocrystalline magnetic core 10 is wound from a ribbon in a stacked configuration, and the racetrack-shaped nanocrystalline magnetic core 10 has a fill factor of 0.76-0.83.
The racetrack-shaped nanocrystalline magnetic core 10 in this embodiment is formed by winding a magnetic strip into a laminated shape, the filling coefficient is 0.76-0.83, specifically, the magnetic strip is directly wound into a ring shape, the ring is extruded into the racetrack-shaped nanocrystalline magnetic core 10 by a special high-temperature-resistant tool fixture, or a tape is wound on the basis of the racetrack-shaped fixture 11 by using a special alloy magnetic material, such as permalloy, a special ultrathin iron sheet and other magnetic materials, namely, the nanocrystalline layer 12 is wound, so that the racetrack-shaped nanocrystalline magnetic core 10 is obtained. It should be noted that the diameter of the arc edge is consistent with the outer width Wout, so that the effect of the equal cross-sectional area at any two positions of the racetrack-shaped nanocrystal core 10 can be achieved.
In this embodiment, the entire racetrack-shaped nanocrystal magnetic core 10 is formed by winding one strip, so that in the winding process, the winding tension can be controlled, and the filling coefficients of all the positions of the racetrack-shaped nanocrystal magnetic core 10 are consistent, so as to obtain the racetrack-shaped nanocrystal magnetic core 10 with good consistency. Meanwhile, the runway-shaped nanocrystalline magnetic core 10 can be made thinner by laminating and winding on the premise of not reducing the magnetic property and the insulating property of the runway-shaped nanocrystalline magnetic core 10, so that the runway-shaped nanocrystalline magnetic core 10 is thinned, and the runway-shaped nanocrystalline magnetic core 10 with better performance and the common mode performance can be obtained under the condition of the same volume.
In one embodiment, the first inductor winding 20 and the second inductor winding 30 are arranged in a single layer.
The single-layer winding is beneficial to realizing automatic production and improving the quality factor of the common-differential-mode inductance of the runway-shaped magnetic core.
Further, the first inductance coil 20 and the second inductance coil 30 are flat wires, and are respectively wound around the two linear magnetic columns.
This implementation is through adopting flat enameled wire to wind the line to runway shape nanocrystalline magnetic core 10 immediately around the mode, thereby do not have flat enameled wire to immediately wind the tensile stress factor influence of mode to runway shape nanocrystalline magnetic core 10, the wire winding decay problem has been avoided, in addition, flat enameled wire immediately winds on sharp magnetic pillar (traditional common mode inductance is with the coiling of coil on arc magnetic pillar, need manual wire winding, the uniformity is poor), can realize the full automatization wire winding, the winding displacement is neat, no cross overlap, high production efficiency, the cost of labor is extremely low, product property ability is reliable and stable.
The invention also provides a power circuit which comprises the runway-shaped magnetic core common-differential mode inductor. The specific structure of the racetrack-shaped magnetic core common-differential-mode inductor refers to the above embodiments, and since the power circuit adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and details are not repeated herein.
The invention also provides a computer, which comprises the power supply circuit. The specific structure of the power supply circuit refers to the above embodiments, and since the computer adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A racetrack core common-differential mode inductor, comprising:
the magnetic core comprises a runway-shaped nanocrystalline magnetic core, a magnetic core body and a magnetic core body, wherein the runway-shaped nanocrystalline magnetic core is provided with two linear magnetic columns and two arc magnetic columns which are oppositely arranged;
the first inductance coil and the second inductance coil are respectively wound on the two linear magnetic columns, and the winding directions of the first inductance coil and the second inductance coil are opposite;
and the two arc-shaped magnetic columns are exposed to increase the inductance leakage of the common-differential-mode inductor of the runway-shaped magnetic core.
2. A racetrack-shaped magnetic core common-mode inductor according to claim 1, characterized in that the cross-sectional area of said linear pole is equal to the cross-sectional area of said arc-shaped pole.
3. A racetrack core common-mode inductor according to claim 2, characterized in that the cross-section of the linear pole is rectangular.
4. A racetrack-shaped magnetic core common-mode inductor according to claim 3, characterized in that two of said arc-shaped legs are semicircular.
5. A racetrack-shaped magnetic core common-differential-mode inductor according to claim 4, characterized in that the material of the racetrack-shaped nanocrystalline magnetic core is an iron-based nanocrystalline magnetic material.
6. A racetrack-shaped core common-mode inductor according to claim 1, wherein the racetrack-shaped nanocrystalline core is wound in a stack from a ribbon, and wherein the racetrack-shaped nanocrystalline core has a fill factor of 0.76-0.83.
7. A racetrack-shaped magnetic core common-mode inductor according to claim 1, characterized in that the first inductor winding and the second inductor winding are arranged in a single layer.
8. A racetrack-shaped magnetic core common-differential mode inductor according to claim 1, wherein the first inductor winding and the second inductor winding are flat wires, and are respectively wound around the two linear magnetic columns in an erected mode.
9. A power supply circuit comprising a racetrack core common-differential mode inductor according to any of claims 1-8.
10. A computer comprising the power supply circuit of claim 9.
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| CN202110040342.6A CN112786286A (en) | 2021-01-12 | 2021-01-12 | Common-differential mode inductor with runway-shaped magnetic cores, power circuit and computer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691121A (en) * | 2021-08-05 | 2021-11-23 | 广东美的厨房电器制造有限公司 | Filter plate and cooking device |
| CN114284021A (en) * | 2021-12-20 | 2022-04-05 | 宁波中科毕普拉斯新材料科技有限公司 | Method for preparing differential mode inductor |
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2021
- 2021-01-12 CN CN202110040342.6A patent/CN112786286A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691121A (en) * | 2021-08-05 | 2021-11-23 | 广东美的厨房电器制造有限公司 | Filter plate and cooking device |
| CN113691121B (en) * | 2021-08-05 | 2024-05-14 | 广东威特真空电子制造有限公司 | Filter plate and cooking device |
| CN114284021A (en) * | 2021-12-20 | 2022-04-05 | 宁波中科毕普拉斯新材料科技有限公司 | Method for preparing differential mode inductor |
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