KR20200094420A - Magnetic Element with E-type core - Google Patents

Abstract

The present invention relates to an E-type core using an integrated magnetics (IM) technology and provides a magnetic element with an E-I-E core coupling structure which is not an existing E-E-I core coupling structure. The magnetic element with the E-type core according to the present invention may include: a first E-type core and a second E-type core; and an E-I-E core coupling structure including an I-type core positioned between the first E-type core and the second E-type core.

Description

Magnetic element with E-type core

The present invention relates to a magnetic element device having an E-type core using the Integrated Magnetics (IM) technology.

With the recent development of electric vehicle (EV) vehicle models, heat generated by an on-board charger (OBC) is dissipated by a cooling device. A vehicle charger is a device that charges a high-voltage battery in a vehicle by using a grid (AC outlet) of an external system. The vehicle charger may use a magnetic element, that is, a commercial core, for power conversion.

In addition, the magnetic element used in the power conversion device mainly uses a commercial core (PQ, EI, EE, RM, POT, Planar, etc.). However, using a commercial core has limitations in optimizing the magnetic element and reducing the volume.

Since the volume of the magnetic element mostly determines the volume of the total power conversion device, in order to reduce the volume of the magnetic element, the operating frequency of the switching element is increased to reduce the inductance, or an IM (Integrated Magnetics) method is used.

In the method of increasing the operating frequency of the switching element, the number of turns is mainly reduced, and the volume of the magnetic body tends to decrease. When the number of turns is reduced, the winding loss is reduced. Therefore, when the core magnetic flux density is reduced, the core loss tends to decrease.

On the other hand, the IM technology is a method of using the offset effect of the magnetic flux by allowing a part of the core to be used in common. When the magnetic flux density becomes low, it is possible to reduce the core cross-sectional area in consideration of core loss. In addition, as the magnetic flux density decreases, core loss at the same core volume is reduced. And the winding part has little change.

Another feature of IM technology is that it is possible to simplify the magnetic element by combining two types of magnetic elements. Typically, inductor 1 + inductor 2, inductor + transformer. Combine inductor 1 + transformer + inductor 2.

And there are two methods of IM (Integrated Magnetics) method used. One is OIM (Open Integrated Magnetics) and the other is CIM (Closed Integrated Magnetics) method. In brief, OIM is a method of adding a winding, and CIM is a method of adding a winding and a coil.

Prior art US Patent Publication No. 2017-0011830 A1 describes the invention of a self-assembly device and its power supply, using a CIM method to add windings and coils.

1 is an exploded perspective view schematically showing a magnetic element using a CIM method according to the prior art.

Referring to FIG. 1, the magnetic element includes a plurality of first magnetic cores 21, a plurality of coil windings 22, and a second magnetic core 23. Each of the plurality of first magnetic cores 21 includes a plurality of leg portions 11 and a first connection portion 26. The first connecting portion 26 is connected to the plurality of leg portions 11. The first connecting portion 26 of the first magnetic core 21 in the upper position is located adjacent to the terminals of the plurality of leg portions 11 of the adjacent first magnetic core 21 in the lower position. Each coil winding 22 is wound around at least one leg (center leg 24) of the plurality of leg portions 11 of the corresponding first magnetic core 21 to form a magnetic element of the corresponding converter. do. The second magnetic core 23 is stacked on the plurality of first magnetic cores 21. The second magnetic core 23 is located adjacent to the terminal of the leg portion 11 of the uppermost first magnetic core 21.

When the two types of magnetic elements are combined, the winding and core losses are smaller than those of the separated magnetic elements, and the total volume of the magnetic elements is also reduced. For some non-complex structures, the assembling properties of the core and the core are improved.

On the other hand, when a magnetic element is combined, a CIM method that can be used by modifying a part of a commercial core is mainly used. Assemble the cores with the same core cross-sectional area and core width and with the same or different heights of the individual cores.

Using the CIM method, the core is self-bonding. In this case, since some areas of the core can be used in common, a canceling effect of magnetic flux occurs in a part of the core. When a magnetic flux canceling effect occurs in a part of the core, the core thickness can be used to be thinner than the existing thickness.

The existing CIM method has a core bonding structure of the existing E-E-I used in the CIM method, as shown in FIG. 1. The E-E-I core bonding structure is a structure in which the E-type core and the E-type core are combined, and the I-type core is sequentially coupled.

However, in the existing E-E-I core bonding structure, the magnetic flux was canceled in some areas of the intermediate E core. The core height of the upper or lower part of the E core can be used to be modified, but when doing so, there are three types of cores, and there is a disadvantage in terms of core sharing.

An object of the present invention is to provide a magnetic element having an E-I-E core bonding structure, not an existing E-E-I core defect structure, as an E-type core using an IM (Integrated Magnetics) technology.

It is also an object of the present invention to provide a magnetic element that makes the height of the I core smaller than the height above or below the existing E core through analysis of the offset information of the magnetic flux.

It is also an object of the present invention to provide a magnetic element having a smaller core cross-sectional area due to a smaller height in the I core (middle core).

It is also an object of the present invention to provide a magnetic material element in which the height of the I core is smaller than the height of the top or bottom of the existing E core, thereby reducing the volume of the entire magnetic material.

In addition, through the E-I-E core bonding structure, it is to provide a magnetic material device capable of reducing the core loss than the existing E-E-I core bonding structure.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

A magnetic element having an E-type core according to the present invention includes an I-type core positioned between a first E-type core and a second E-type core, and the first E-type core and the second E-type core. It may include an EIE core bonding structure comprising a.

In the magnetic element having an E-type core according to the present invention, the first E-type core and the second E-type core are opposite to each other in a direction facing each other, wherein the first and second outer core parts and the inner core parts are respectively configured. It can be located.

In addition, the magnetic element according to the present invention may have a height of the I core smaller than the height of the top or bottom of the existing E core through analysis of offset information of the magnetic flux.

The magnetic element according to the present invention is able to use the E-core of the same size through the E-I-E core bonding structure, thereby reducing the type of core, and thus has an advantageous effect in terms of core sharing.

In addition, the magnetic element according to the present invention can make the height of the I core smaller than the height above or below the existing E core through analysis of offset information of the magnetic flux. That is, when the cores are combined in the direction in which the magnetic flux is reduced in the E-I-E core coupling structure, the middle core (I core) can reduce the height above or below the core while being equal to the magnetic flux density of the inner core.

In addition, the magnetic element device according to the present invention has a smaller core cross-sectional area due to a smaller height in the I core (middle core). Due to the smaller cross-sectional area, the magnetic flux density of the I core becomes similar to that of the E core.

In addition, in the magnetic material element according to the present invention, the height of the I core is smaller than the height above or below the existing E core, so that the volume of the entire magnetic material is reduced. That is, in the conventional E-E-I type, the region where the magnetic flux is canceled is the section where the E-E contacts, so it is not possible to reduce the height above or below the core.

In addition, the magnetic element according to the present invention can reduce the core loss by reducing the core volume than the existing E-E-I core bonding structure through the E-I-E core bonding structure. This can reduce the price of the magnetic element.

In addition to the above-described effects, the concrete effects of the present invention will be described together while describing the specific matters for carrying out the invention.

1 is an exploded perspective view schematically showing a magnetic element using a CIM method according to the prior art.
2A and 2B are perspective views illustrating a magnetic material element according to an embodiment of the present invention.
3 is a cross-sectional view showing a cross section of the winding coil in FIGS. 2A and 2B.
4A is a cross-sectional view showing a magnetic material element according to an embodiment of the present invention.
4B is an equivalent circuit diagram of the magnetic element according to FIG. 4A.
4C is a graph showing magnetic flux densities of cores included in FIG. 4A, respectively.
5A is a configuration diagram of an inductor showing voids in a magnetic element.
5B is a circuit diagram showing an equivalent circuit of a general interleaved boost converter.
6A and 6B are examples of separating and using the same two inductors, respectively.
7A is a first embodiment showing a configuration in which a core is coupled in a method of combining two types of magnetic elements.
7B is a circuit diagram showing an equivalent circuit of the magnetic element device constructed in FIG. 7A.
7C is a graph showing the magnetic flux density of the magnetic element constructed in 7A.
8A is a second embodiment showing a configuration in which a core is coupled in a method of combining two types of magnetic elements.
FIG. 8B is a circuit diagram showing an equivalent circuit of the magnetic material element constructed in FIG. 8A.
8C is a graph showing the magnetic flux density of the magnetic material element constructed in 8A.
FIG. 9A is a third embodiment showing the configuration of a magnetic element that physically couples two inductors using two first E-type cores and a second E-type core and one I-type core.
9B is a circuit diagram showing an equivalent circuit of the magnetic material element constructed in FIG. 9A.
9C is a graph showing the magnetic flux density of the magnetic element constructed in 9A.
FIG. 10A is a fourth embodiment showing a configuration of a magnetic element that physically couples two inductors using two first E-type cores and a second E-type core and two I-type cores.
FIG. 10B is a circuit diagram showing an equivalent circuit of the magnetic material element constructed in FIG. 10A.
10C is a graph showing the magnetic flux density of the magnetic material element constructed in 10A.

The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, and accordingly, a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. In the description of the present invention, when it is determined that detailed descriptions of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, detailed descriptions will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

In the following, the arrangement of any component in the "upper (or lower)" or "upper (or lower)" of the component means that the arbitrary component is disposed in contact with the upper surface (or lower surface) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component. Also, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected to or connected to each other, but other components may be "interposed" between each component. It should be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

Hereinafter, a magnetic element having an E-type core according to some embodiments of the present invention will be described.

2A and 2B are perspective views illustrating a magnetic material element according to an embodiment of the present invention. 2A is an exploded view of a magnetic material element according to an embodiment of the present invention, and FIG. 2B is a combined view of a magnetic material element according to an embodiment of the present invention.

2A and 2B, the magnetic element comprises two first E-type cores 100 and a second E-type core 200, and the first E-type cores 100 and 2 has an EIE core coupling structure with an I-type core 300 positioned between the E-type cores 200.

In this case, the first E-type core 100 and the second E-type core 200 include first and second outer core parts 110, 120, 210, 220, and inner core parts 130, 230. And it may include a core body 140, 240. Preferably, the first E-type core 100 and the second E-type core 200 may have the same size and structure. As described above, the magnetic element can use the same size E core, and thus the core type can be reduced, which may be advantageous in terms of core commonalization.

The magnetic element has an advantageous effect in terms of core sharing since the E-I-E core coupling structure enables the use of E cores of the same size, thereby reducing the core type.

As an embodiment, the core body 140 will be described in a separate configuration. However, the core body 140 may be represented by the inner core portion 130. Further, the core body 140 may be integrally formed with the first and second outer core parts 110 and 120 and the inner core part 130.

By the winding coil 150 wound on the inner core portion 130, the first and second outer core portions 110 and 120 may generate flux.

The inner core portion 130 may be disposed between the first and second outer core portions 110 and 120. In the inner core portion 130, the winding coil 150 may be wound. At this time, the winding coil 150 may include an inner winding coil wound around the inner core portion 130 and an outer winding coil wound around the inner winding coil. 2A and 2B show the inner winding coil.

In addition, the I-type core 300 may include only the core body without the first and second outer core parts 110 and 120 and the inner core part 130. At this time, the core body included in the I-type core 300 may be made smaller than the height (thickness) above or below the E core included in the existing magnetic body element.

That is, when the core is coupled in the direction in which the magnetic flux is reduced in the EIE core coupling structure, which is the magnetic material element of the present invention, in the I-type core 300, the magnetic flux density of the inner core parts 130 and 230 is equal to I -The height above or below the type core 300 can be reduced. On the other hand, the existing magnetic element I-E-E core bonding structure or E-E-I core bonding structure was unable to reduce the height above or below the core because the region where the magnetic flux is canceled is the section where the E-E contacts.

As such, the cross-sectional area of the core becomes small due to the reduced height of the I-type core 300. Due to the reduced cross-sectional area, the magnetic flux density of the I-type core 300 becomes similar to that of the first E-type core 100 and the second E-type core 200.

In addition, the magnetic material elements include first and second outer core parts 110 and 120 (210 and 220) and inner core parts (first and second outer core parts) configured in the first E-type core 100 and the second E-type core 200, respectively. 130) (230) are positioned to face each other in a direction facing each other. That is, the first and second outer core parts 110 and 120, 210 and 220, the inner core parts 130 and 230 are located in the inner part, and the core bodies 140 and 240 are located in the outer part.

Accordingly, the magnetic body elements include first and second outer core portions 110 and 120 of the first E-type core 100 and first and second outer core portions 210 and 220 of the second E-type core 200. Are positioned opposite each other, and the inner core portion 130 of the first E-type core 100 and the inner core portion 230 of the second E-type core 200 are positioned to be opposite to each other. The I-type core 300 is located between the first E-type core 100 and the second E-type core 200.

In addition, the winding coil 150 wound on the inner core portion 130, as shown in Figure 2b, the first E-type core 100 and the second E-type core 200 so as to penetrate through the side ), the I-type core 300 may be configured to have a narrower center width than a lateral width. Accordingly, the first E-type core 100, the second E-type core 200, and the I-type core 300 may gradually decrease in width from the side to the center.

In FIG. 2A, a magnetic element in which two E-type cores are combined and one I-type core are formed, but the present invention is not limited thereto and may be composed of three or more E-type cores and two or more I-type cores. .

In addition, Figure 3 is a cross-sectional view showing a cross-section of the winding coil in Figure 2, as shown in Figure 3, the winding coil 150 is composed of an insulating coating (insulation) (151) and copper (152). In the winding coil 150, the X (X) mark indicates the direction in which the current enters the ground, and the dot (·) indicates the direction in which the current comes out of the ground.

4A is a cross-sectional view showing a magnetic material element according to an embodiment of the present invention. And Figure 4b is an equivalent circuit diagram of the magnetic element according to Figure 4a, Figure 4c is a graph showing the magnetic flux density of each of the core included in Figure 4a. 4C (a) is a graph showing the magnetic flux density of the first E-type core 100, Figure 4C (b) is a graph showing the magnetic flux density of the I-type core 300, Figure 4c ( c) is a graph showing the magnetic flux density of the second E-type core 200.

As shown in FIG. 4A, the magnetic elements are two first E-type cores 100 and second E-type cores 200 facing each other and the first E-type core 100. And an EIE core coupling structure having an I-type core 300 positioned between the second E-type cores 200.

In addition, the magnetic element device includes a winding coil 150 wound around the inner core portion 130 and 230 of the first E-type core 100 and the second E-type core 200 to the winding area 160, and 1 E-type core 100, I-type core 300 and the second E-type core 200, each having a predetermined gap (gap) between the air gap (air gap) 400, and the winding coil 150 ) Further includes a bobbin 170 formed on the outer side of the inner core portion 130 and 230 on which it is wound.

The magnetic element has an equivalent circuit in which two inductors are coupled, as shown in Fig. 4B.

Meanwhile, each inductor includes a void. In the inductor, the air gap is mainly used for storing energy. The void also reduces the effect of other core permeability on temperature changes. Therefore, the inductor can prevent the core from being saturated by using the air gap.

The pores have a powdery magnetic substance (MPP, High flux, Sendust, Mega flux, etc.) present inside the core material depending on the core material, and ferrites (PC40, PC44, PC47, PC90, PC95, etc.) without voids inside the core material have. Of the ferrite materials, PC95 has a small core loss in a wide temperature range. In the case of a ferrite core material, the core permeability has nonlinearity depending on the magnetic field.

When using a ferrite core to create voids, there are generally two possible locations for the voids. It is a center+side air gap with a gap between the center and a side, and a center air gap with a gap only in the center without a gap on the side.

5A is a configuration diagram of an inductor showing a void in a magnetic element in FIG. 4A. 5a(a) is a block diagram of an inductor showing a center+side air gap in a magnetic element, and FIG. 5a(b) is a block diagram of an inductor showing a center air gap in a magnetic element. to be. 5A(A) and 5A(B) differ only in the position of the void 40, and the rest are the same.

In the magnetic element, the inductor showing the air gap is predominantly the inductor to which the central air gap 40 is applied. The reason is that the air gap 40 can be easily made. The central + side void 40 has a disadvantage in that a material having a different permeability is inserted into the void portion. However, the center + side air gap 40 has an advantage of reducing the AC winding loss by distributing a magnetic field.

Theoretically, if the permeability, the core cross-sectional area, the number of turns of the winding coil, and the inductor are the same, the height (or length) of the central void is twice the center + side void.

In addition, the direction of the magnetic flux of the inductor follows Ampere's right-hand rule, and depends on the current direction of the winding coil 150. In general, when the starting point of the winding coil 150 is a direction that enters the ground from the right direction of the inner core portion 130, the magnetic flux is directed upwards of the inner core portion 130.

The basic configuration of a transformer is similar to that of an inductor. The difference is that the primary and secondary winding coils 150 are separated. Theoretically, the transformer does not store energy, so there is no void because it is a device that transfers primary energy to the secondary side.

5B is a circuit diagram showing an equivalent circuit of a general interleaved boost converter.

As shown in Fig. 5B, the equivalent circuit has two interleaved inductors L1 and L2 connected in parallel. At this time, the two interleaved inductors are the same, and the individual size is smaller than a single boost converter.

In general, an interleaved boost converter is more efficient than a single boost converter.

6A and 6B are examples of separating and using the same two inductors, respectively.

6A(A) and 6B(A), each inductor includes two first E-type cores 100 and second E-type cores 200 facing each other. .

And as shown in Figures 6a (b) and 6b (b), each inductor flows a current through the winding coil 150, and the direction of magnetic flux follows Ampere's right-hand rule. . That is, when the starting point of the winding coil 150 is a direction that enters the ground from the right direction of the inner core portion 130, the magnetic flux is directed upwards of the inner core portion 130.

And, as shown in Figures 6a (b) and 6b (b), each inductor is not magnetically coupled to the core. As described above, in the case of an interleaved boost converter operating in a continuous-conduction mode (CCM), the magnetic flux density waveform in the inner core portion 130 is the same for both inductors. The advantage of having an interleaved boost converter in a circuit is that it reduces the current pulsation of the capacitor at the output stage. However, in the case of an inductor which is a magnetic element, even if it is configured in parallel, it was not possible to reduce the pulsation of the magnetic flux density. The structure in which the winding coils 150 are connected in parallel can lower the current density of the winding coils 150, thereby reducing the size of the inductor.

7A is a first embodiment showing a configuration in which a core is coupled in a method of combining two types of magnetic elements. 7B is a circuit diagram showing an equivalent circuit of the magnetic element constructed in FIG. 7A, and FIG. 7C is a graph showing magnetic flux density of the magnetic element constructed in 7A.

As shown in FIG. 7A, a magnetic element combining two inductors according to the first embodiment has an E-E core coupling structure in which each inductor including the E-type cores of FIGS. 6A and 6B is coupled to each other. At this time, the two inductors are positioned upward and downward so that the magnetic flux direction generated by each inductor has the same magnetic flux direction.

As shown in FIG. 7C, the magnetic flux density in the inner core portion 130 is the same for both inductors.

7A physically couples the two inductors, but the upper first E-type core 10 of the second inductor located below and the lower second E-type core 20 of the first inductor located above. There is a very small physical void in the contact area, so there is no magnetic flux cancellation effect in the core. In this case, the void becomes the resistance component of the magnetic flux (permeance=1/reluctance). Generally, the magnetic flux flows toward the smaller resistance. If there is an undesired air gap between the first E-type core 10 and the second E-type core 20, the magnetic flux flows toward its core without crossing the gap. In other words, the magnetic flux does not pass toward the opposite core.

Therefore, even if the two inductors are physically coupled, the equivalent circuit of FIG. 7B does not cause a magnetic flux canceling effect in the E-type cores of the two inductors. Physically, the two inductors are separate. Accordingly, the core height and volume of the two inductors are not reduced.

8A is a second embodiment showing a configuration in which a core is coupled in a method of combining two types of magnetic elements. 8B is a circuit diagram showing an equivalent circuit of the magnetic element constructed in FIG. 8A, and FIG. 8C is a graph showing magnetic flux density of the magnetic element constructed in 8A.

As shown in FIG. 8A, a magnetic element combining two inductors according to the second embodiment has an E-E core coupling structure in which each inductor having the configuration of FIGS. 6A and 6B is coupled. At this time, the two inductors are positioned up and down so that the direction of the magnetic flux generated by each inductor has the opposite direction of the magnetic flux.

The second embodiment described in FIG. 8A differs from the first embodiment described in FIG. 7A above in the magnetic flux direction of each coupled inductor, and the rest of the configuration is the same. That is, FIG. 8A shows a direction in which the magnetic flux of the second inductor located at the bottom is opposite to the direction of the magnetic flux of the first inductor at the top.

FIG. 8A shows that two inductors are physically coupled, but the upper first E-type core 10 of the second inductor located below and the lower second E-type core 20 of the first inductor located above. There are very small physical voids at the contact point. In this case, the void becomes the resistance component of the magnetic flux (permeance=1/reluctance).

Therefore, as described in FIG. 7A, even if the two inductors are physically coupled, the equivalent circuit of FIG. 8B does not cause a magnetic flux canceling effect in the two inductor E-type cores. Physically, the two inductors are separate. Accordingly, the core height and volume of the two inductors are not reduced.

As described in the first embodiment and the second embodiment, the method of physically coupling the two inductors cancels magnetic flux in the core due to the presence of unwanted voids between the first E-type core and the second E-type core. It is a structure that cannot obtain an effect.

As a method for solving this problem, one or more I-type cores may be added together with two first E-type cores 10 and 20.

FIG. 9A is a third embodiment showing a configuration of a magnetic element that physically couples two inductors using two first E-type cores and a second E-type core and one I-type core. And Figure 9b is a circuit diagram showing the equivalent circuit of the magnetic element configured in Figure 9a, Figure 9c is a graph showing the magnetic flux density of the magnetic element configured in 9a.

As shown in FIG. 9A, a magnetic element incorporating two inductors according to the third embodiment is an upper portion of a magnetic element comprising two first E-type cores and a second E-type core having the configuration of FIG. 7A. The I-type core 30 is positioned to have an EEI core bonding structure. At this time, the two inductors are positioned upward and downward so that the magnetic flux direction generated by each inductor has the same magnetic flux direction.

As shown in FIG. 9C, the magnetic flux density in the inner core portion 130 is the same for both inductors. As described above, when the current waveforms of the two inductors are the same, the magnetic flux density in the lower portion of the first E-type core 10 of the first inductor 10 positioned above according to the equivalent circuit of FIG. 9B is shown in FIG. 9C (b ), theoretically 0 (zero).

Accordingly, a canceling effect of magnetic flux occurs in the two inductor cores, so that the core height (volume) is reduced than the height (volume) of the core shown in FIG. 7A. Therefore, the height T3 of the magnetic element shown in FIG. 9A is reduced than the height T2 of the magnetic material shown in FIG. 7A.

However, the magnetic element having the E-E-I core bonding structure does not take into account the offset effect of the magnetic flux generated in a part of the core, so the height above or below the core is the same. That is, in order to use the same first E-type core 10 and the second E-type core 20, although there is an offset effect of magnetic flux in some core regions, the height above or below the core is not reduced.

FIG. 10A is a fourth embodiment showing the configuration of a magnetic element that physically couples two inductors using two first E-type cores and a second E-type core and two I-type cores. 10B is a circuit diagram showing an equivalent circuit of the magnetic element constructed in FIG. 10A, and FIG. 10C is a graph showing magnetic flux density of the magnetic element constructed in 10A.

As shown in FIG. 10A, a magnetic element incorporating two inductors according to the fourth embodiment is an upper portion of a magnetic element comprising two first E-type cores and a second E-type core having the configuration of FIG. 7A. The first I-type core 30a is positioned on the second I-type core 30b, and the second I-type core 30b is positioned between the first E-type core and the second E-type core to bond the EIEI core. . At this time, the two inductors are positioned upward and downward so that the magnetic flux direction generated by each inductor has the same magnetic flux direction.

As shown in FIG. 10C, according to the equivalent circuit of FIG. 10B, the lower portion of the first E-type core 10 of the first inductor 10 positioned above and the second inductor 20 located below The magnetic flux density of the second E-type core 20 is the same as the magnetic flux density of the inner core portion of the first inductor 10 and the inner core portion of the second inductor 20.

However, in the magnetic element having the EIEI core coupling structure according to the fourth embodiment, by adding the second I-type core 30b, unlike the third embodiment, the height T2 of the magnetic element is shown in FIG. 7A. It becomes equal to the height T2 of the magnetic material.

On the other hand, as shown in FIG. 4A, the magnetic element of the present invention includes two first E-type cores 100 and second E-type cores 200 positioned opposite each other, and the first E -It has an EIE core coupling structure having an I-type core 300 positioned between the type core 100 and the second E-type core 200.

The E-I-E core coupling structure is a structure capable of reducing the height of the inner core portion 130. This is a core bonding structure that can actively utilize the offset effect of magnetic flux generated in a part of the core while changing the E-I-E core bonding structure from the existing E-E-I core bonding structure.

As an advantage, if two E-type cores are combined, two identical E-cores can be used, and one middle core with a reduced height can be used.

And as shown in FIG. 4B, if the current pulsation of the capacitor at the output stage is reduced due to the interleaved effect of the circuit, when the E-I-E core coupling structure is used, the interleaving effect can be partially seen in the core. However, in the methods of the first to fourth physically bonding methods, the effect of canceling the magnetic flux cannot be seen.

And, as shown in Figure 4c (a) (c), if the current waveforms of the two inductors are the same, theoretically as shown in Figure 4c (b), the magnetic flux does not flow in the inner core portion 130. However, the reason why the inner core part 130 cannot be removed is that without the inner core part 130, each magnetic flux affects each other, so that they are not separated inductors, but are coupled inductors. In this case, the magnetic flux of the first inductor 100 and the magnetic flux of the second inductor 200 influence and receive each other.

Due to the reduced I-type core height, the total magnetic element height T1 and volume are reduced than the magnetic body height T2 illustrated in FIG. 7A.

As described above, the present invention has been described with reference to the exemplified drawings, but the present invention is not limited by the examples and drawings disclosed in the present specification, and can be varied by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, although the operation and effect according to the configuration of the present invention has not been explicitly described while explaining the embodiment of the present invention, it is natural that the predictable effect should also be recognized by the configuration.

100: first E-type core (first inductor) 110, 120: first outer core portion
130, 230: inner core portion 140, 240: core body
150: winding coil 151: insulation coating
152: copper 160: winding area
170: bobbin 200: second E-type core (second inductor)
210, 220: second outer core portion 230: inner core portion
300: I-type core 400: air gap

Claims (6)

A first E-type core and a second E-type core;
An I-type core positioned between the first E-type core and the second E-type core; And
A magnetic material element including a winding coil wound around the first E-type core and the second E-type core.
According to claim 1,
The first E-type core and the second E-type core
First and second outer core parts;
An inner core portion disposed between the first and second outer core portions; And
A magnetic body device comprising a core body in which the first and second outer core parts and the inner core part are combined.
According to claim 2,
The first E-type core and the second E-type core
First and second outer core portions and inner core portions respectively configured are magnetic elements positioned to face each other in a direction facing each other.
According to claim 2,
The I-type core
A magnetic material element characterized in that it is smaller than the height of the core body.
According to claim 1,
The first E-type core, the second E-type core, and the I-type core are magnetic elements that are configured to have a narrower central width than a lateral width.
According to claim 1,
The winding coil is a magnetic material element composed of insulation and copper.

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