WO2010072055A1

WO2010072055A1 - Magnetic device with series excitation magnetic core

Info

Publication number: WO2010072055A1
Application number: PCT/CN2009/001569
Authority: WO
Inventors: 孙建康
Original assignee: Sun Jiankang
Priority date: 2008-12-26
Filing date: 2009-12-28
Publication date: 2010-07-01
Also published as: CN101552101A; CN101552101B

Abstract

A magnetic device with a series excitation magnetic core comprises an A sheet magnetic core (1) and a B sheet magnetic core (2) which are spliced in an intersectional way, as well as a C sheet magnetic core (4) and a D sheet magnetic core (5), which form a circulation loop with magnetic lines of force connected end to end together with the A sheet magnetic core (1) and the B sheet magnetic core (2). The A sheet magnetic core (1) and the B sheet magnetic core (2) are respectively provided with a middle post (1-1,2-1), an edge foot (1-2,2-2) and a bottom side (1-3,2-3) vertically connected with the middle post and the edge foot. The middle post (1-1,2-1) and the edge foot (1-2,2-2) are respectively positioned on two structural layers. The middle post (1-1) of the A sheet magnetic core (1) and the edge foot (2-2) of the B sheet magnetic core (2) as well as the C sheet magnetic core (4) are positioned on the same structural layer. The middle post (2-1) of the B sheet magnetic core (2) and the edge foot (1-2) of the A sheet magnetic core (1) as well as the D sheet magnetic core (5) are positioned on the other structural layer. The bottom side (1-3) of the A sheet magnetic core (1) and the bottom side (2-3) of the B sheet magnetic core (2) are spliced together in an overlapping way.

Description

Magnetic device with series excitation core

The present invention relates to a magnetic device made of a magnetic conductor material, and more particularly to a transformer or inductor made of a series magnetic core. Background technique

At present, a well-known method of miniaturizing a magnetic device is to replace a magnetic material having a larger resistivity to increase the effective magnetic induction Be of the magnetic conductor material, and at the same time, to increase the operating frequency f of the circuit. The specific basis is the formula of the electromagnetic induction law of the transformer in the prior art:

V= fN Be Ae

V-coil induced voltage; f-operating frequency;

N—the number of windings of the coil; B e—the effective magnetic induction of the magnetic conductor material;

The effective cross-sectional area of the conductor material of Ae^;

That is, when the effective magnetic induction intensity Be and the operating frequency f are increased, the number of turns of the coil can be reduced, the winding space can be saved, and the magnetic device can be miniaturized.

However, after the operating frequency of the circuit rises, it will bring about a series of faults such as electromagnetic interference and circuit complexity. Or directly reduce the wire diameter in the coil, but at the same time increase the loss and temperature rise of the device, which is contradictory to environmental protection and energy saving.

Therefore, it is necessary to develop a new technology to realize the miniaturization of magnetic devices. Summary of the invention

The invention is thick in that it overcomes the defects in the prior art, and designs a magnetic component having a series excitation magnetic core, which can be matched with the coil and new without changing the material of the magnetic core. By designing the core structure, Be is improved from the way of magnetic flux circulation, thereby reducing the number of turns of the magnetic device coil and saving the winding space, thereby realizing the miniaturization of the magnetic device.

In order to achieve the above object, the technical solution of the present invention is to use a magnetic device having a series excitation core, including a series excitation core and at least one set of coils, and for assembling the assembly. a skeleton of the coil and the magnetic core; the magnetic core includes at least one set of cross-plug A-piece cores and a B-piece core, and at least one set together with the A-piece core and the B-core core constitute a magnetic line end a C-piece magnetic core and a D-piece magnetic core connected to the loop, wherein the A-core core and the B-core core are respectively provided with a center pillar, a side leg and a bottom edge perpendicularly connecting the center pillar and the side leg, The center pillar and the side leg are not in the same layer, and the center pillar of the A core is located on the same level as the edge of the B core and the C core, and the middle pillar and the A core of the B core The side legs and the D cores are located on the same layer, and the bottom edges of the A cores and the bottom edges of the B cores can be overlapped with each other.

Wherein, an insulating magnetic non-magnetic layer is interposed between the cross-plugged A-piece magnetic core and each mating surface of the B-core magnetic core, between the C-piece magnetic core and the D-core magnetic core mating surface An insulating magnetically impermeable layer is also added.

The projection of the orthographic projection or cross section of the cross-plug A core and the B core is E-shaped, and the open side of the E-shape is for mating with the bobbin wound with the coil.

Wherein the cross-plugged A-piece magnetic core and the B-piece magnetic core are mounted on the E-shaped opening side with a bobbin wound around the coil and with two E-shaped or I-shaped C-piece magnetic cores and D-pieces The magnetic core is matched.

The cross-plugged A-piece magnetic core and the B-piece magnetic core are matched with the two-layer E-shaped C-piece magnetic core and the D-piece magnetic core, and the cross-plugged A-piece magnetic core and B-piece The orthographic projection of the magnetic core is such that the E-shaped opening side is inserted into the bobbin wound around the coil with respect to the C-piece core and the E-shaped opening side of the D-piece core.

The cross-plugged A-piece magnetic core and the B-piece magnetic core are matched with the two-layer E-shaped C-piece magnetic core and the D-piece magnetic core, and the cross-plugged A-piece magnetic core and B-piece The cross-sectional projection of the core is such that the E-shaped opening side is inserted into the bobbin wound around the coil with respect to the C-piece core and the E-shaped opening side of the D-piece core.

Wherein, the middle pillar and the side legs of the cross-plug A core and the B core are a long middle column and a long side leg, and the other piece is a short middle column and a short side leg.

Wherein, the A-core core and the B-core magnetic core are inserted at both ends of the coil bobbin An air gap may be disposed on the center pillar between the C core and the D core, and the air gap may be disposed on one side magnetic path or on both side magnetic paths, and the magnetic path passes through the gas The gaps are connected in series.

Wherein, the cross-plugged A-piece magnetic core and the B-piece magnetic core are solidified into a first magnetic core body by glue or epoxy resin, and the C-piece magnetic core and the D-piece magnetic core are also glued or epoxy. The resin is cured into a second magnetic core body, and the first magnetic core body and the second magnetic core body are filled into a skeleton wound with a coil to be solidified into a magnetic device having a series excitation magnetic core.

Wherein, the first magnetic core body and the second magnetic core body are flat end portions, and the flat ends of the first magnetic core body and the second magnetic core body are aligned with each other at the joint.

Wherein, the insulating non-magnetic conductive layer is an insulating film or an insulating glue.

Wherein, the A-piece magnetic core and the B-piece magnetic core are annular magnetic cores, the toroidal magnetic core is an integral magnetic core, or the toroidal magnetic core is composed of a plurality of annular magnetic sheets, or a plurality of curved magnetic cores The core is assembled into a toroidal core, and magnetic lines of force may form two or more loops connected end to end in the toroidal core.

The advantages and advantageous effects of the present invention are that, by using a magnetic core capable of generating a series excitation effect, the transformer or the inductor can reduce the number of turns of the coil, save the winding space, and improve the input stage and output. The voltage ratio of the stage can also increase the efficiency of the transformer or inductor. The magnetic core can reduce the volume of the transformer or inductor by half or more when the same input-to-output voltage ratio or inductance is the same, so that the size of the transformer or inductor can be miniaturized, or the transformer can be in the same circle. In the case of digital ratio, the voltage ratio between the input terminal and the output terminal can be increased by two times or more. Due to the reduced volume, the amount of raw materials will be reduced, reducing the volume and reducing the cost of the transformer or inductor. Since the magnetic core can make the magnetic lines of force in the input stage magnetic core be coupled to the output stage after passing through the magnetic core for the first time, the magnetic core can be passed through the magnetic core again for the second time to pass through the output stage coil. When the input coil of the transformer passes through the magnetic field line once, the output coil passes the magnetic flux lines twice or more. When the other parameters are the same, the output voltage of the transformer is made up to twice the output voltage of the existing transformer. , ie: U, /U ₂ =n(N, /N ₂ ), where n is an integer. A transformer assembled with such a magnetic core has generated a primary electricity using the above-described magnetic circuit cycle. The process of rising and falling pressure. That is, in the transformer of such a magnetic core, the voltage rise and fall is not completely dependent on the number of turns of the coil. That is to say, the transformer has a two-fold or more-fold increase in the efficiency of the transformer without changing the volume of the core and the number of turns of the input and output coils.

In the conventional transformer, if the original magnetic core is taken out and the magnetic core of the present invention is inserted to replace the original magnetic core, the magnetic path length of the new magnetic core is made equal to the magnetic path length of the old magnetic core. In the new transformer, the length of the middle column and the length of the two legs are only half of the length of the old core and the length of the two legs. Because the magnetic flux is cycled twice, the length of the core is halved, and its equivalent magnetic circuit. The length is constant, the equivalent cross-sectional area of the core is equal, the volume is half of the volume of the existing transformer, the inductance of each coil is the same, the number of turns is the same, the applied circuit topology is unchanged, and the number of turns of each coil is halved. The width of the colloid winding groove is reduced by half, the volume is reduced, the copper consumption is reduced, and the power density is doubled.

Similarly, in the inductor, the magnetic core is used, and the internal magnetic lines of the magnetic core can also be connected in series. After the magnetic core is coupled through the coil once, the magnetic lines generated by the magnetic core can be again passed through the coil for the second time. Once the magnetic lines of force can circulate twice or more, and two or more magnetic lines of force are connected in series, the coil generates two excitations to the core, which can narrow the hysteresis loop area and reduce the hysteresis. Loss, corrected the linear relationship of the hysteresis loop, and extended the magnetic circuit. The inductance can be adjusted by adjusting the length of the magnetic circuit, not just by the air gap, because the less the air gap, the less the core loss and the less signal distortion. DRAWINGS

1A is a schematic view showing the assembly of an A-piece magnetic core and a B-piece magnetic core in the present invention (upper and lower combinations); FIG. 1A is a schematic view showing the assembly of an A-piece magnetic core and a B-piece magnetic core in the present invention (left-right combination); FIG. Schematic diagram of the structure of the A-piece magnetic core in the present invention;

1C is a schematic view showing the structure of a B-piece magnetic core in the present invention;

2 is a schematic view showing the assembly of an A-piece magnetic core, a B-piece magnetic core, a C-piece magnetic core, and a D-piece magnetic core in the present invention;

3 is a schematic view showing the assembly of the A core and the B core in the present invention; FIG. 4 is a schematic view showing the assembly of the magnetic core, the C core and the D core in FIG. 3; Figure 5 is a schematic structural view of the magnetic core of Figure 2 assembled with a coil;

Figure 6 is a schematic view showing the structure of the magnetic core and the coil assembled in Figure 4;

Figure 7 is a schematic view showing a magnetic circuit circulation loop in a magnetic core in the present invention;

Figure 8 is a diagram showing the hysteresis loop in the existing magnetic core;

Figure 9 is a diagram showing the hysteresis loop in the magnetic core of the present invention;

Figure 10 is a schematic diagram of a magnetic line circulation loop in a conventional magnetic core;

Figure 11 is a schematic diagram of a magnetic line circulation loop in the magnetic core of the present invention;

Figures 12-1 to 12-5 show the physical model of the circulation of magnetic lines in five kinds of toroidal cores. In the figure: 1. A-core core; 1-1, A-core core; 1-2, A-core core; 1-3, A-core core; 2. B-piece Core; 2-1 B-core core; 2-2, B-core core; 2-3, B-core core bottom; 3. Insulating non-magnetic layer; 4, C Sheet core; 4-1, C piece core center column; 4-2; C piece core side leg; 5, D piece core; 5-1, D piece core center post; 5-2; D piece Core side legs; 6, primary coil; 7, secondary coil. detailed description

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings and embodiments. The following examples are only intended to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the scope of the present invention.

As shown in Figures 7 to 9, the principle that the magnetic core of the present invention is capable of generating series excitation is: It is well known that a coiled coil of a current generates a magnetic field having a magnetic field strength H, H = NI / L, (where I is flowing through the coil Current, N is the number of turns of the coil, and L is the axial length of the coil). When the magnetic conductor is internally added, the magnetic lines of force are re-distributed by the magnetic conductor. Depending on the magnetic permeability of the magnetic conductor material, the induced magnetic field inside the magnetic conductor is different, and the physical quantity of the magnetic induction in the described magnetic material conductor is recorded as B. , magnetic induction intensity B = UH, (U is the magnetic permeability of the magnetic conductor, recorded as magnetic permeability). When the current in the coil is not a constant current source but changes, a well-known hysteresis loop can be obtained when measuring the periodic variation of B and H, as shown in Fig. 8, (Hr, Hs, Br, Bs). In the absence of air gap GAP, according to The periodic duality, when the magnetic conductor exhibits the remanence Br, the corresponding coil exhibits the coercive force Hr. In order to achieve the end-to-end closure of the magnetic lines of force, the composition is closed to reduce the leakage flux. The magnetic conductor is made into a ring-shaped closed or EE, EI, ER, EP, RM, POT, UU, etc., so that the two parts are assembled and closed to become a closed closed magnetic circuit. When there is an air gap GAP in the middle section of the magnetic circuit, the hysteresis loop is inclined downward, which shows that Br decreases and Bs does not change. At this time, the corresponding coil shows that the coercive force Hr is not reduced. Why is there a physical correspondence between Hr and Br when there is no air gap GAP? When there is air gap GAP, B r decreases, but Hr does not change substantially? Is there a way to reduce Hr and Br at the same time? Thus, the present invention has been improved as follows.

As shown in Fig. 8, first of all, starting from the magnetic core, Hr is reduced, and Hr is derived from the magnetic effect of the coil, which is the excitation of the magnetic conductor by the magnetic field in the coil. If the number of turns of the coil or the current in the coil is directly reduced In fact, it is only H that changes in the hysteresis loop that is equivalent to the hysteresis loop. It is easy to see that the Hr in the hysteresis loop cannot be moved. After changing the coil, only the magnetic material conductor is changed. Can the magnetic conductor itself act as an excitation to change the shape of the hysteresis loop? With this idea, the present invention analyzes the magnetic circuit of the magnetic conductor, the material of the magnetic conductor cannot be changed, and when the air gap changes the shape of the hysteresis loop, the material of the magnetic conductor is not changed, then only the magnetic circuit can be left. change. In order to change the magnetic circuit, first analyze the magnetic circuit used to measure the hysteresis loop. It is similar to the end of the coil from the other side of the coil to the other end of the closed magnetic field line type column, because it is constrained by the winding, so long or thin The influence of Hr is less practical, and the magnetic circuit is filtered from the coil to pass through the structure of the invention only once, so that the magnetic circuit passes through the coil twice. The present invention obtains a curve in which the coercive force Hr is reduced. In retrospect, the physical analysis process of the present invention: as shown in FIG. 10, the normal magnetic ring is equally divided into two parts, each part of which has a magnetic field force of Φ/2 flowing through the line 圏, both of the same size, the same direction, parallel not intersect. As shown in FIG. 11, when the cross-plugged magnetic ring of the present invention is used, the magnetic lines of the first and last broken lines are interconnected to obtain a magnetic field core of the series magnetic field. When the coil is only excited to the upper portion, the lower half is not wound. In the upper coil, the inductance is only 1/4 of the magnetic field line in Figure 10, because the cross-sectional area is reduced by half and the magnetic flux length is doubled. When the coil is wound, the lower part is also enveloped, because it is the series relationship of Figure 10. Double the inductance. Because the size of the inductor directly determines the amount of conversion power, so in the figure

In 11, when the cross-sectional area is constant, the length of the magnetic field line is reduced by half, that is, the diameter of the ring is reduced by half. In order to achieve the same inductance as in Figure 10, half of the number of turns must be reduced. This shows that the magnetic core of the series excitation can achieve the same excitation with fewer turns, and the same number of turns can achieve the same excitation as long as the current is smaller, because the current of the coil is reduced, so it is verified.

Hr becomes smaller.

As shown in FIGS. 5 to 7, in the present invention, first, the magnetic core is made of a magnetic material, and the magnetic core is formed into an orthographic projection or a cross-sectional projection of an E-shaped structure, and a circular or square skeleton is wound with a primary structure. The coil 6 and the secondary coil 7 are provided with through holes in the center of the skeleton, and both ends of the skeleton center hole are respectively inserted into the center pillars of the E-shaped magnetic core. Since the present invention adopts a set of A-piece magnetic core 1 and B-piece magnetic core 2 structures which are cross-plugged, and another set of two-layer E-shaped or I-shaped C-piece magnetic core 4 and D-piece magnetic core 5 structure, When the primary coil 6 is connected to the alternating current, an alternating magnetic field is generated around the primary coil 6, and the alternating magnetic field is reinforced by the magnetic core. As shown in FIG. 7, the magnetic field lines of the magnetic field are circulated in the magnetic core of the present invention, and the magnetic lines of force are conducted along the center pillar 1-1 of the A-core core to the legs 1-2 of the A-core core, and then from A. The side legs 1-2 of the core are conducted to the side legs 5-2 of the D core, and then from the side 5-2 of the D core 5 to the center pillar 5-1 of the D core, and then The center pillar 5-1 of the D-core core is conducted to the pillar 2-1 of the B-core core, and is then conducted from the center pillar 2-1 of the B-core core to the side leg 2-2 of the B-core core, and then from the B The side leg 2-2 of the core is conducted to the side 4-2 of the C core, and then from the side 4-2 of the C core to the center pillar 4 of the C core, and finally The center pillar 4-1 of the C-core core is transferred back to the center pillar 1-1 of the A-core core, so that the two split magnetic circuits in the original transformer are connected in series to form a closed magnetic circuit connected end to end. In the transformer, the magnetic field and magnetic lines generated by the primary coil 6 will simultaneously induce the induced electromotive force and the induced current in the secondary coil 7, and the induced current in the secondary coil 6 will also generate a magnetic field and a magnetic field line, and the secondary coil 7 The generated magnetic field and magnetic lines of force will be superimposed with the magnetic field and magnetic lines generated by the primary coil to enhance the effect of series excitation.

The specific technical solutions of the present invention are as follows:

A magnetic device having a series excitation core, comprising a series excitation core and at least one A set of coils, and a skeleton for assembling the coil and the magnetic core; the magnetic core includes at least one set of cross-plug A-piece cores 1 and B-piece cores 2, as shown in Fig. 1A. And at least one set of C-core core 4 and D-piece core 5 constituting a loop of the magnetic flux line end-to-end with the A-piece magnetic core 1 and the B-piece magnetic core 2, as shown in FIG. 2, in the A The core 1 and the B core 2 are respectively provided with a middle pillar 1-1 of the A core, a middle pillar 2-1 of the B core, a leg 1-2 of the A core, and a B magnet. The side legs 2-2 of the core are perpendicularly connected to the bottom edges 1-3 of the A-core cores of the center pillars and the side legs, and the bottom edges 2-3 of the B-piece cores, as shown in FIG. 1B. The middle pillar and the side legs are respectively located on different levels, and the middle pillar 1-1 of the A-core core is located on the same level as the side leg 2-2 of the B-core core and the C-core core 4, and the B-piece The center pillar 2-1 of the magnetic core and the leg 1-2 of the A core and the D core 5 are located on the other layer, and the bottom edge 1-3 of the A core and the bottom edge of the B core 2-3 can be plugged together one another as shown in Figure 1C.

In the present invention, an insulating magnetic non-magnetic layer is interposed between the mating faces of the cross-plug A core 1 and the B core 2, and the C core and the D magnet are An insulating magnetically permeable layer 3 is also interposed between the core mating faces. The above-mentioned insulating magnetic non-magnetic layer 3 will separate the magnetic lines of force between the two magnetic cores stacked on each other, and will not be electrically connected to each other, and the magnetic lines of force can only be penetrated from a core by a connecting surface or air gap perpendicular to the magnetic lines of force. Into another core.

In the present invention, the preferred embodiment is to form an E-shape by the projection of the orthographic projection or cross-section of the cross-plugged A-piece magnetic core 1 and the B-piece magnetic core 2, the open side of the E-shape Used for mating with a bobbin wound around a coil.

In the present invention, the cross-plug A-core core 1 and the B-core core 2 are mounted on the E-shaped opening side with a bobbin wound around the coil and then with two I-shaped C-core cores. 4 cooperate with the D core 5, or the set of cross-plug A core 1 and B core 2, cooperate with the two-layer E-shaped C core 4 and D core 5 The orthographic projection of the cross-plug A core 1 and the B core 2 is inserted into the E-shaped opening side opposite to the E-shaped opening side of the C core 4 and the D core 5 The skeleton of the coil is shown in Figure 5. In the present invention, the cross-plugged A-piece magnetic core 1 and the B-piece magnetic core 2 cooperate with two-layer E-shaped C-piece magnetic core 4 and D-piece magnetic core 5, and the A-piece magnetic sheet The cross-sectional projection of the core 1 and the B core 2 is such that the E-shaped opening side is inserted into the bobbin wound with the coil opposite to the E-shaped opening side of the C-piece core 4 and the D-piece core 5, and the cross-sectional projection is E. The open core includes magnetic cores (ER, EI, EP, ETD, EFD, RM, POT, EPC, PQ, ED).

In the present invention, the middle pillar and the side leg of the cross-plug A core 1 and the B core may be set to be a middle pillar and a long leg, and the other may be set to a short center pillar and short. Side feet, as shown in Figure 3 and Figure 6.

In the present invention, an air gap may be provided in the middle pillar between the A-piece magnetic core 1 and the B-piece magnetic core 2 and the C-piece magnetic core 4 and the D-piece magnetic core 5 which are inserted at both ends of the bobbin. The air gap may be disposed on one side of the magnetic circuit or on both sides of the magnetic circuit, and the magnetic circuit is connected in series with each other through the air gap, that is, between one side or both sides of the mutually opposing magnetic core Leave a gap, as shown in Figure 4.

In the present invention, the cross-plugged A-piece magnetic core 1 and the B-piece magnetic core 2 are cured with a glue or epoxy resin into a first magnetic core body, and the C-piece magnetic core and the D-piece magnetic core are also Curing to a second magnetic core body with glue or epoxy resin, the first magnetic core body and the second magnetic core body being filled into a skeleton wound with a coil, and being cured into a magnetic device having a series excitation magnetic core . The first magnetic core body and the second magnetic core body are both flat ends, and the flat ends of the first magnetic core body and the second magnetic core body are aligned with each other at the joint, as shown in FIG. 4 and FIG. Show.

In the present invention, the A-piece magnetic core 1 and the B-piece magnetic core 2 and the C-piece magnetic core 4 and the D-piece magnetic core 5, which are inserted at both ends of the bobbin, may be provided with an air gap or insulation. Magnetic permeability layer 3.

In the present invention, the A-piece magnetic core 1 and the B-piece magnetic core 2 are annular magnetic cores, the toroidal magnetic core is an integral magnetic core, or the toroidal magnetic core is assembled by a plurality of annular magnetic sheets, or A toroidal core is assembled from a plurality of arc-shaped magnetic cores, and magnetic lines of force may form two or more loops connected end to end in the toroidal core, as shown in FIG. In the present invention, the insulating magnetically permeable layer 3 is an insulating film or an insulating paste.

As shown in Fig. 6, in the present invention, when the primary coil 6 is wound between the A-core core 1 and the B-core core 2, when the primary coil 6 is energized, the magnetic flux in the central core of the primary coil 6 is equal to Half of the magnetic flux in the middle core of the secondary coil 7. The invention can use a larger wire diameter, a smaller number of coil turns, and a lower copper consumption under the same winding space and the ratio of the voltage to the rise and fall. To this end, the present invention designs a magnetic core for series excitation of a magnetic circuit of a transformer, the magnetic core integrally assembling the A core 1 and the B core 2 by an insulating material, and then with the C core 4 and The D-piece magnetic core 5 is assembled into a transformer, and the A-piece magnetic core 1 and the B-piece magnetic core 2 are connected to the C-piece magnetic core 4 and the D-piece magnetic core 5 to form an integral transformer on the skeleton around the coil, and then a tape or a ring is used. Oxygen grease is fixed.

The magnetic core structure designed by the present invention is compared with the existing magnetic core structure. As shown in FIG. 5, on the transformer composed of the existing magnetic core, the E-shaped magnetic core on the side of the coil bobbin on the existing transformer is removed. Or the core of the E-shaped cross section, replaced with a set of cross-plug A-core core 1 and B-core core 2, can obtain a higher voltage, the effect is more obvious. Comparing the two transformer cores, the magnetic core of the present invention can realize the end-to-end magnetic flux loops by bypassing each other. The magnetic core of the present invention can make the magnetic lines pass through the primary coil twice. And the secondary coil 7, as shown in FIG. 6, if the A-core core 1 and the B-core core 2 are one long and one short, and the primary coil 6 is mounted between the long film and the short film, the magnetic force in the primary coil 6 Only one magnetic flux line passes through the core, and a cross-plug A core 1 and a B core 2 are inserted into the secondary coil 7, and two magnetic lines of force pass through the core in the secondary coil 7. And the magnetic flux lines that pass twice are connected in series. Considering the influence of the leakage flux, the output voltage can be twice as low as the output voltage of the existing magnetic core transformer.

As shown in FIG. 5, if the lengths of the A core and the B core are equal, the magnetic flux in the core in the primary coil 6 is equal to the magnetic flux in the core in the secondary coil 7, and the core in the primary coil 6 The magnetic flux inside and the magnetic flux in the magnetic core in the secondary coil 7 are both excited twice. When the flux has two or more cycles in series, the coil is excited twice to the core. As shown in Fig. 9, the hysteresis loop area can be narrowed by half, and the hysteresis loss, such as hysteresis loop, is reduced. The thin line in Fig. 8 is the hysteresis loop of the ordinary soft magnetic material, and the thick line is the hysteresis loop of the open air gap. The hysteresis loop has obvious residual magnetization reduction, the magnetic saturation is constant, and the hysteresis loop is More inclined and linear;

The thick line in Fig. 9 is a hysteresis loop which is excited in series on the basis of the open air gap. The hysteresis line is obviously reduced in remanence, the coercive force is reduced, the area is reduced, the magnetic saturation is constant, and the hysteresis loop is More steep and linear, while BH is more narrow.

In order to further explain the reduction in the number of turns, it is also possible to cause the same effect of the excitation, that is, the same magnetic field strength can be obtained when the number of turns is reduced. The present invention designs five physical models as shown in Figure 12 below.

These five physical models can be used to analyze the inductance of five toroidal cores (usually the magnetic ring is used to measure the inductance to convert the permeability Ue). Figure 12-1 shows the series ring magnet. The inductance of the lower half of the core is not wound around the coil: _{1 1} -4πυ _ε (Α _β /2) / (ί ₆ + L _e ) = l / 4AL0;

Figure 12-2 shows the inductance of the lower half of the existing double-ring new core without being wound around the coil: AL ₂ =47iU _e (A _e /2)/(L _e + L _e )=l/2AL0;

Figure 12-3 shows that the upper and lower halves of the existing new double-ring core are wound around the coil. The direction of the magnetic lines in the upper and lower cores are the same, but the inductance is:

AL ₃ =47iU _e (A _e /2)/L _e + 47rU _e (A _e /2)/L _e =47iU _e A _e /L _e =AL0;

Figure 12-4 shows the upper and lower parts of the existing old magnetic core combined and wound around the coil. The direction of the magnetic lines in the upper and lower cores are the same but they are closed and not connected. The inductance is:

AL ₄ =47rU _e A _e /L _e =AL0;

Figure 12-5 shows that the upper and lower halves of the series annular core are wound around the coil. The inductance is: AL ₅ = 4 X 47tU _e (A _e /2) / (L _e + L _e ) + 4 χ 47iU _e ( A _e /2) / (L _e + L _e )

=2 x 47iU _e A _e /L _e =2 x AL0.

The basic method is to divide the magnetic ring of FIG. 4 of FIG. 12 into upper and lower magnetic rings for comparison. If the inductance in this equation is AL0, then the inductance in Figure 12-1 should be 1/4 times AL0; the inductance in Figure 12-2 should be 1/2 times AL0; Figure 12 -3 The inductance in the middle should be 1 times AL0; the inductance in Figure 12-5 should be 2 times AL0

Where Ue is the magnetic permeability of the magnetic material, Ae is the equivalent cross-sectional area of the magnetic circuit, and Le is the equivalent length of the magnetic circuit. The results show that the inductance of Figure 12-5 is twice that of Figure 12-4. If both the magnetic rings of Figure 12-4 and Figure 12-5 are packaged, only Ae, Le can be measured from the shape, and the same Ae and Le will be obtained on the outer shape. Therefore, when applying the formula of electromagnetic induction law (V=^fNBeAe), the effective cross-sectional area of the magnetic conductor material is unchanged; the effective magnetic induction strength of the magnetic conductor material is determined by the material, and both of them should be designed with no saturation in both states. The frequency of the work has not changed; the voltage measured by the coil is not the same. In order to achieve the same voltage, the present invention needs to reduce the number of turns to ^/2N because of the inductance.

L = Al * N ² = 47 oi _e A _e / L _e * N * N. After winding the same number of turns, the measured inductance is twice, then under the same material, there will be two Ue, and the multiple is related. If the inductance is high, the magnetic permeability Ue is high, so the Ue is doubled in series at a time, and the n-th series is increased by n times Ue (n natural number).

In order to achieve the effect of the magnetic ring of Fig. 12-5, to miniaturize the magnetic device, the present invention redesigns the magnetic cores EE, EI, ER, EP, RM, POT, EPC, PQ, ED, etc. for the device, and the specific method is similar. .

In the current transformer, when the transformer replaces the old transformer, the length (horizontal) or height (vertical) of the new transformer is made half or more of the old transformer. The hole in the skeleton of the transformer is unchanged, and the core is equivalent. The cross-sectional area is equal. In order to reduce the mold opening, try to share the standard specifications of the existing specifications, such as ER28/34. The volume is reduced to ER28/28, which is reduced by 17.6%, and the number of turns of the coil is reduced by 36%. EE19/27 is miniaturized. For EE19/16, the shrinkage is 40%, the number of turns of the coil is reduced by 45%; the number of turns of each coil is reduced, the copper consumption is reduced, but the inductance is the same, and the air gap is opened in one of the two magnetic circuits connected in series with each other. DC field, not easy to be saturated. If the two magnetic circuits are separated, the air gap magnetic circuits are connected in series, the magnetic core is easy to be saturated, and the inductance is adjusted, the number of turns is the same, the applied circuit topology is unchanged, the skeleton winding width is reduced, and the volume is reduced. Reduced, reduced copper consumption and increased power density. The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and retouchings without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention. Industrial applicability

The magnetic core provided by the invention can increase the voltage ratio between the input terminal and the output terminal in the same turns ratio when the other parameters are the same. The applied circuit topology is unchanged, the number of coil turns is reduced, the width of the colloid winding is reduced, the volume is reduced, the copper consumption is reduced, and the power density is increased. Therefore, the present invention has industrial applicability.

Claims

A magnetic device having a series excitation core, comprising: a series excitation core and at least one set of coils, and a skeleton for assembling the coil and the magnetic core; the magnetic core comprising at least one set of cross plugs An A core and a B core, and at least one set of a C core and a D core together with the A core and the B core to form a loop of the magnetic flux line end to end, the A magnetic The core and the B core are respectively provided with a middle pillar, a side leg and a bottom edge perpendicularly connecting the middle pillar and the side leg, the middle pillar and the side leg are not in the same structural layer, and the middle pillar of the A core core The bottom leg of the B-core core and the C-core core are in the same structure, and the center pillar of the B-core core is in the same structure as the edge of the A-core core and the D-core core, and the A-core core The bottom edge and the bottom edge of the B core may be interposed one upon another.

2. The magnetic device having a series excitation core according to claim 1, wherein an insulation is added between the cross-plug A core and the B core. The magnetic permeability layer is also provided with an insulating magnetic non-magnetic layer between the C-piece magnetic core and the D-core magnetic core mating surface.

3. The magnetic device having a series excitation core according to claim 2, wherein the projection of the 'positively projected or cross-section of the 'cross-plugged A-piece core and the B-piece core is E-shaped, The open side of the E-shape is for mating engagement with the bobbin around which the coil is wound.

4. The magnetic device with a series excitation core according to claim 3, wherein said cross-plug A-piece core and B-piece core are wound around a coil on the E-shaped opening side. The skeleton is matched with two E-shaped or I-shaped C-core cores and D-core cores.

5. The magnetic device having a series excitation core according to claim 3, wherein the cross-plug A core and B core, and the two-layer E-shaped C core and The D-piece magnetic core is matched, and the orthographic projection of the cross-plug A-core core and the B-core core is such that the E-shaped opening side is inserted opposite to the C-piece core and the E-shaped opening side of the D-piece core. Wired skeleton on the skeleton.

6. The magnetic device having a series excitation core according to claim 3, wherein said cross-plug A-piece core and B-piece core, and two-layer E-shaped C-piece core and D The cores of the cross-plug A core and the B core are projected with the E-shaped opening side interposed with the C-piece core and the E-shaped opening side of the D-core core. On the skeleton of the coil.

7. A magnetic device having a series excitation core according to any one of claims 1 to 6,

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Correction page (Article 91) The middle column and the side legs of the cross-plug A core and the B core may be a long middle column and a long side leg, and the other is a short middle column and a short side leg, at the bottom. At the edge, when the magnetic lines of force are around front and rear or left and right, the middle column and the side legs are long, and the other piece is short. At the bottom side, when the magnetic lines of force are wound up and down, the middle column and the side legs can be the same length.

8. The magnetic device having a series excitation core according to claim 7, wherein said A core and the B core and the C core and the D sheet are inserted at both ends of the bobbin. An air gap may be disposed on the center pillar between the magnetic cores, and the air gap may be disposed on one side magnetic circuit or on both side magnetic paths, and the magnetic circuits are connected to each other in series through the air gap.

9. The magnetic device with a series excitation core according to claim 8, wherein the cross-plug A core and the B core are cured with a glue or epoxy to form a first core. The C-core core and the D-piece magnetic core are also cured into a second magnetic core body by glue or epoxy resin, and the first magnetic core body and the second magnetic core body are filled with a skeleton glue around the wire 圏Or the epoxy resin is cured into a magnetic device having a series excitation core.

10. The magnetic device having a series excitation core according to claim 9, wherein the first core body and the second core body are flat ends, the first core body and the first core body The flat ends of the two core bodies are aligned with each other at the joint.

A magnetic device having a series excitation core according to claim 3, wherein said insulating non-magnetic layer is an insulating film or an insulating paste.

12. The magnetic device with a series excitation core according to claim 1, wherein the A-piece core and the B-piece core are toroidal cores, and the toroidal core is an integral core, or The toroidal magnetic core is assembled by a plurality of annular magnetic sheets, or a plurality of arc-shaped magnetic cores are combined into a toroidal magnetic core, and magnetic lines of force can form two or more loops connected end to end in the toroidal core.

13. The magnetic device having a series excitation core according to claim 3, wherein said cross-plug A-piece core and B-piece core, and two-layer E-shaped C-piece core and D When the core cores are matched, when the intermediate pillars and the side legs of the cross-plug A core and the B core are combined with each other, the positional relationship can be designed to be up-and-down or left-right or triangular or arc-butted, and the C-piece The mating end face shape of the magnetic core and the D-piece magnetic core is identical to the shape of the end faces of the A-piece magnetic core and the B-piece magnetic core and is just aligned.

14. The magnetic device having a series excitation core according to claim 3, wherein

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Correction page (Article 91) The cross-plug A core and B core, A core and B core are assembled, such as ER, EI, EP, ETD, EFD, RM, POT, EPC, PQ, ED A piece in the core.