CN216597239U

CN216597239U - Magnetic integrated device and isolated switching power supply

Info

Publication number: CN216597239U
Application number: CN202123361817.6U
Authority: CN
Inventors: 郝帅翔; 姚云鹏
Original assignee: Suzhou Huichuan United Power System Co Ltd
Current assignee: Suzhou Huichuan United Power System Co Ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-05-24
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a magnetism integrated device and isolated form switching power supply, this magnetism integrated device includes: the magnetic core comprises a U-shaped magnetic core column and an I-shaped magnetic core column, and the I-shaped magnetic core column is arranged between two side columns of the U-shaped magnetic core column; the first winding and the second winding are respectively wound on the I-shaped magnetic core column and are arranged on the I-shaped magnetic core column at intervals. The utility model discloses dwindle the volume of magnetism integrated device, improved the heat dispersion of magnetism integrated device.

Description

Magnetic integrated device and isolated switching power supply

Technical Field

The utility model relates to a magnetism integrated device technical field, in particular to magnetism integrated device and isolated form switching power supply.

Background

With the development of miniaturization and lightness of the switching power supply, higher requirements are made on the volume of the power supply, and how to research the high-efficiency high-power-density power supply is more and more urgent. At present, discrete elements are mostly adopted between a transformer and an inductor, or when a magnetic integrated device is adopted, UU type magnetism or QI type magnetism is usually adopted, and the two modes have the problems of large volume and poor heat dissipation of the magnetic integrated device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a magnetism integrated device and isolated form switching power supply aims at dwindling the volume of magnetism integrated device, improves magnetism integrated device heat dispersion.

In order to achieve the above object, the present invention provides a magnetic integrated device, which includes:

the magnetic core comprises a U-shaped magnetic core column and an I-shaped magnetic core column, and the I-shaped magnetic core column is arranged between two side columns of the U-shaped magnetic core column;

and the first winding and the second winding are respectively wound on the I-shaped magnetic core column, and are arranged on the I-shaped magnetic core column at intervals.

Optionally, the first winding comprises:

the primary side inductance winding and the primary side winding of the transformer are arranged in series; or, the primary side inductance winding and the primary side winding of the transformer are arranged in parallel.

Optionally, the section of the I-shaped core column is arranged in a circular or quasi-circular shape, and the section of the U-shaped core column is arranged in a rectangular shape;

the sectional area of the I-shaped magnetic core column is equal to that of the U-shaped magnetic core column.

Optionally, the second winding comprises:

the transformer comprises a secondary side inductance winding and a transformer secondary side winding, wherein the secondary side inductance winding and the transformer secondary side winding are arranged in series; or the secondary inductance winding and the secondary winding of the transformer are arranged in parallel.

Optionally, the first winding is a primary winding of a transformer, and the second winding is a secondary winding of the transformer.

Optionally, an air gap is disposed on the I-type core post.

Optionally, the bottom pillar of the U-shaped core pillar and the I-shaped core pillar are arranged at an interval;

the thickness of the bottom column of the U-shaped magnetic core column is smaller than that of the I-shaped magnetic core column.

The utility model also provides an isolated form switching power supply, include as above the magnetism integrated device.

Optionally, the isolated switching power supply further includes a resonant capacitor, and the resonant capacitor is electrically connected to the magnetic integrated device.

Optionally, the isolated switching power supply further includes:

the radiator is provided with a radiating cavity, and the magnetic integration device is accommodated in the radiating cavity.

The utility model discloses a sharing magnetic core, it is integrated in a magnetism integrated device with primary side inductance winding and secondary side inductance winding, perhaps integrate transformer primary side winding and transformer secondary side winding in a magnetism integrated device, perhaps integrate primary side inductance winding and transformer primary side winding in a magnetism integrated device, perhaps integrate secondary side inductance winding and transformer secondary side winding in a magnetism integrated device, perhaps integrate former secondary side inductance and transformer in same magnetism integrated device, in some embodiments, the mode that can also adopt the sharing winding realizes integratedly making whole converter only contain a magnetic element, thereby reduce holistic volume of magnetic element and weight, power density and efficiency are improved, in order to make things convenient for actual design and application. Compared with a UU-shaped magnetic core, the winding coils are arranged on the two sides of the UU-shaped magnetic core, so that the structure of the magnetic integrated device is square, the winding is complex, and the magnetic integrated device is difficult to adapt to a long and narrow heat dissipation cavity; or PQ magnetic core only sets up the winding coil at the center pillar of E type magnetism, and it is relatively poor to lead to the integrated device heat dissipation of magnetism, and power density is low, the utility model discloses a U type magnetic core post and I type magnetic core post to constitute the magnetic core to with first winding and second winding respectively around locating on the I type magnetic core post, only wind on a magnetic core post, the wire winding is simple, need not be at the two windings of magnetic core post, can reduce the volume of the integrated device of magnetism, is favorable to being adapted to the heat dissipation cavity of long narrow shape.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 magnetic core in a magnetic integrated device according to the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the magnetic integrated device of the present invention;

fig. 3 is a schematic circuit diagram of an embodiment of the magnetic integrated device of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Magnetic core	LP1	Primary side inductance winding
110	U-shaped magnetic core column	LP2	Primary winding of transformer
				120	I type magnetic core column	LS1	Secondary side inductance winding
200	First winding	LS2	Secondary winding of transformer
				300	Second winding	LP3	Excitation inductance winding

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The utility model provides a magnetism integrated device is applied to isolated form switching power supply, can be for alternately parallelly connected DC-DC converter's inductance, passive component inductance, common mode inductance and differential mode inductance in the soft switching converter to and leak inductance and high frequency transformer integration etc.. With the development of miniaturization and lightness of the switching power supply, the size of the power supply is required to be higher, and how to research the high-efficiency and high-power density power supply is more and more urgent, so that the magnetic integration technology is also an inevitable trend for achieving the goal. Different from the traditional discrete structure, the magnetic integration technology realizes integration by sharing a magnetic core or a winding, thereby reducing the overall volume and weight of the magnetic element and improving the power density and efficiency. For example, in a bi-directional DCDC converter, such as CLLLC, the design of parametric symmetry and thermal symmetry is very difficult. At present, a local magnetic integration PQI-shaped structure can ensure parameter symmetry and thermal symmetry, but has the problem of low integration level; the existing magnetic integration general structures are two, the first structure is a UU-shaped magnetic core, and both sides of the UU-shaped magnetic core are provided with windings; the second is a PQ core with a winding only at the center leg. The first structure generally forms a square shape, is difficult to adapt to a long and narrow heat dissipation cavity, and has complex winding; the magnetic core middle column of the second structure is arranged at the innermost side, so that the heat dissipation is poor and the power density is low.

In order to further reduce the volume, weight and loss of the magnetic device and improve the performance of the magnetic device, magnetic integration technology is studied and applied to the design of power electronic magnetic devices.

The integration of the magnetic elements aiming at the inductor and the inductor is relatively less, and generally, the EE, EFD and other magnetic cores are adopted to realize the independent magnetic integrated devices, and when the integrated device is applied to a multi-path parallel LLC circuit, the multiple independent magnetic integrated devices can only be connected in parallel. Obviously, the device integrated by the integration mode is still large in size and occupies a large space, and meanwhile, the magnetic integrated device with the structure works independently in a multi-path parallel LLC circuit, so that the magnetic core loss (iron loss) of the circuit is difficult to reduce.

Referring to fig. 1 to 3, in order to solve the above-mentioned problems, the magnetic integrated device includes:

the magnetic core 100 comprises a U-shaped core column 110 and an I-shaped core column 120, wherein the I-shaped core column 120 is arranged between two

side columns

110a and 110b of the U-shaped core column 110;

and a first winding 200 and a second winding 300 respectively wound on the I-type core leg 120, wherein the first winding 200 and the second winding 300 are arranged on the I-type core leg 120 at intervals.

In this embodiment, the U-shaped magnetic core 100 may be formed by combining two L-shaped magnetic cores 100, two ends of the I-shaped magnetic core column 120 abut against two

side columns

110a and 110b of the U-shaped magnetic core 100, a closed frame shaped like a Chinese character kou is formed between the U-shaped magnetic core 100 and the I-shaped magnetic core column 120, and when the first winding 200 and the second winding 300 are wound around the I-shaped magnetic core column 120, corresponding magnetic circuits are formed. As shown in fig. 2, the dotted line in fig. 2 indicates a magnetic circuit formed by winding the first winding 200 and the second winding 300 around the I-type core leg 120. The first winding 200 may be a primary winding, and specifically may include a primary inductance winding LP1 and a transformer primary winding LP2, where the primary inductance winding LP1 and the transformer primary winding LP2 are connected in series; alternatively, the primary inductor winding LP1 and the transformer primary winding LP2 are connected in parallel. Similarly, the second winding 300 may be a primary winding, and the second winding 300 may specifically include a secondary inductance winding LS1 and a transformer primary winding LP2, where the secondary inductance winding LS1 and the transformer secondary winding LS2 are arranged in series; alternatively, the secondary inductor winding LS1 and the transformer secondary winding LS2 are connected in parallel. The first winding 200 and the second winding 300 may also be two windings of the primary side and the secondary side of the transformer, specifically, the first winding 200 is a primary winding LP2 of the transformer, and the second winding 300 is a secondary winding LS2 of the transformer. Alternatively, the first winding 200 and the second winding 300 may also be two inductance windings disposed on the primary side and the secondary side, specifically, the first winding 200 is a primary side inductance winding LP1, and the second winding 300 is a secondary side inductance winding LS 1.

The number of turns of the two windings of the first winding 200 and the second winding 300 may be the same or different, and may be specifically set according to different power devices formed by the windings. The winding pattern of the first winding 200 and the second winding 300 may be adjusted according to the device formed by the first winding 200. Specifically, in the embodiment where the first winding 200 and the second winding 300 are two windings of the primary side and the secondary side of the transformer, two enameled wires (or copper wires) may be used, and after being wound on the I-type core leg 120, the primary winding LP2 of the transformer and the secondary winding LS2 of the transformer are formed. Two windings of transformer this moment share a magnetic core 100 to at 100 posts of magnetic core on the same side wire winding, can solve the adoption and be that UU type magnetic core 100 both sides all have the wire winding, perhaps EE type magnetic core 100 when the wire winding in magnetic core 100 center pillar, lead to the structure to form squarely, be difficult to be adapted to the heat dissipation cavity of long narrow shape, the complicated problem of wire winding moreover.

In the embodiment where the first winding 200 and the second winding 300 are the primary inductance winding LP1 and the secondary inductance winding LS1, two enamelled wires (or copper wires) may be used, and the primary inductance winding LP1 and the secondary inductance winding LS1 are formed after being wound on the I-type core leg 120. At the moment, two or more inductors are wound on one magnetic core 100, the primary side inductance winding LP1 and the secondary side inductance winding LS1 share the same magnetic core 100, and the winding is carried out on the same magnetic core 100 column, so that the problem that the inductance is realized by adopting a discrete device can be solved, the integral volume and weight of the magnetic element are reduced, and the power density and the efficiency are improved.

In the embodiment where the first winding 200 includes the primary inductor winding LP1 and the transformer primary winding LP2, when the primary inductor winding LP1 and the transformer primary winding LP2 are connected in series, an enameled wire (or a copper wire) may be used, and the primary inductor winding LP1 may be wound on the I-type core leg 120, and then the transformer primary winding LP2 may be wound on the I-type core leg 120, or the transformer primary winding LP2 may be wound on the I-type core leg 120, and then the primary inductor winding LP1 may be wound on the I-type core leg 120. The primary inductor winding LP1 and the transformer primary winding LP2 can also be formed by folding an enameled wire (or a copper wire) in half to form two winding parts with different lengths, and winding the two winding parts around the I-shaped magnetic core column 120 respectively. At this time, the primary side inductance winding LP1 and the transformer primary side winding LP2 share one winding, one of two terminals of the winding serves as a signal access terminal of the primary side inductance winding LP1, and the other terminal serves as a signal access terminal of the transformer primary side winding LP2, so that signal terminals for realizing electric connection between the primary side inductance winding LP1 and the transformer primary side winding LP2 can be reduced, and an electric connection part, namely a bonding pad, when the primary side inductance winding LP1 and the transformer primary side winding LP2 are installed on a circuit board can be reduced.

When the primary inductor LP1 and the transformer primary LP2 are connected in parallel, two enameled wires (or copper wires) may be used to wind around the I-type core leg 120 to form the primary inductor LP1 and the transformer primary LP 2. At this time, the windings of the primary side inductance winding LP1 and the primary side winding LP2 of the transformer respectively have two terminals, one of the terminals is connected in parallel between a signal connection terminal (positive terminal of a connection power supply) of the primary side inductance winding LP1 and a signal connection terminal of the primary side winding LP2 of the transformer, the other terminal is connected in parallel between a signal connection output terminal (negative terminal of the connection power supply) of the primary side inductance winding LP1 and a signal connection output terminal of the primary side winding LP2 of the transformer, in practical application, one connection terminal of the primary side inductance winding LP1 and one connection terminal of the primary side winding LP2 of the transformer can be packaged as one terminal, and the other connection output terminal of the primary side inductance winding LP1 and the other connection output terminal of the primary side winding LP2 of the transformer are packaged as the other terminal. Therefore, the wiring terminals of the primary inductor winding LP1 and the primary transformer winding LP2 which are respectively wound by different magnetic cores 100 to form two independent devices can be reduced, and the electric connection part, namely a bonding pad, can be reduced when the transformer primary inductor winding LP1 and the primary transformer winding LP2 are mounted on a circuit board.

In the embodiment where the second winding 300 includes the secondary inductor winding LS1 and the transformer secondary winding LS2, when the secondary inductor winding LS1 and the transformer secondary winding LS2 are connected in series, an enameled wire (or a copper wire) may be used, the secondary inductor winding LS1 may be wound on the I-type core leg 120, and then the transformer secondary winding LS2 may be wound on the I-type core leg 120, or the transformer secondary winding LS2 may be wound on the I-type core leg 120, and then the secondary inductor winding LS1 may be wound on the I-type core leg 120. One enameled wire (or a copper wire) can also be adopted, the enameled wire is folded in half to form two wire winding parts with different lengths, and the two wire winding parts are wound around the I-shaped magnetic core column 120 respectively to form an auxiliary side inductance winding LS1 and a transformer auxiliary side winding LS 2. In this case, the secondary inductor winding LS1 and the transformer secondary winding LS2 share a single winding, one of the two terminals of the winding serves as a signal input terminal of the secondary inductor winding LS1, and the other terminal serves as a signal input terminal of the transformer secondary winding LS2, so that signal terminals for electrical connection between the secondary inductor winding LS1 and the transformer secondary winding LS2 can be reduced, and an electrical connection portion, i.e., a pad, when the secondary inductor winding LS1 and the transformer secondary winding LS2 are mounted on a circuit board can be reduced.

When the secondary inductor winding LS1 and the transformer secondary winding LS2 are arranged in parallel, two enameled wires (or copper wires) may be used to form the secondary inductor winding LS1 and the transformer secondary winding LS2 after being wound on the I-type magnetic core column 120. In this case, the windings of the secondary inductor winding LS1 and the secondary transformer winding LS2 respectively have two terminals, one of the terminals is connected in parallel between a signal input terminal (positive input power supply terminal) of the secondary inductor winding LS1 and a signal input terminal of the secondary transformer winding LS2, and the other terminal is connected in parallel between a signal output terminal (negative input power supply terminal) of the secondary inductor winding LS1 and a signal output terminal of the secondary transformer winding LS2, and in actual application, one input terminal of the secondary inductor winding LS1 and one input terminal of the secondary transformer winding LS2 may be packaged as one terminal, and the other output terminal of the secondary inductor winding LS1 and the other output terminal of the secondary transformer winding LS2 may be packaged as the other terminal. Therefore, the connection terminals of the secondary inductor winding LS1 and the secondary transformer winding LS2 which are respectively formed by winding different magnetic cores 100 into two independent devices can be reduced.

In addition, when the primary inductance winding LP1, the transformer primary winding LP2, the secondary inductance winding LS1, and the transformer secondary winding LS2 are wound around the I-shaped core leg 120 to form a highly integrated magnetic integrated device, the four windings may be sequentially arranged and combined, and only the primary and secondary variable windings need to be arranged at intervals, for example, from one end of the U-shaped core leg 110 to the other end of the U-shaped core leg 110, the primary inductance winding LP1, the transformer secondary winding LS2, the transformer primary winding LP2, and the secondary inductance winding LS1 may be sequentially arranged. Therefore, a plurality of discrete magnetic elements can be integrated on one magnetic core structure, the voltage and current relationship of each magnetic piece in a specific circuit topology and the magnetic flux and magnetic potential relationship in a magnetic circuit topology are fully utilized, and the integration of a plurality of magnetic pieces is realized, so that the size is reduced, the power density of the switching power supply is improved, the loss is reduced, and the output filtering effect is improved.

An insulating sheet can be further arranged between the first winding 200 and the second winding 300, the insulating sheet can be in a ring shape and also can be in a U shape, the ring-shaped insulating sheet is sleeved on the I-shaped magnetic core column 120, and the ring-shaped insulating sheet is fixedly arranged on the I-shaped magnetic core column 120 through viscous materials, so that the coil contact of the first winding 200 and the second winding 300 is avoided, or the first winding 200 and the second winding 300 are intertwined together.

The utility model discloses a sharing magnetic core 100, integrate primary inductance winding LP1 and secondary inductance winding LS1 in a magnetism integrated device, perhaps integrate primary inductance winding LP2 and transformer secondary winding LS2 in a magnetism integrated device, perhaps integrate primary inductance winding LP1 and transformer primary winding LP2 in a magnetism integrated device, perhaps integrate secondary inductance winding LS1 and transformer secondary winding in a magnetism integrated device, perhaps integrate primary and secondary inductance and transformer in same magnetism integrated device. Therefore, the magnetic integration of the transformer and the transformer, the inductor and the inductor, and the polarity of the transformer and the inductor can be realized. In some embodiments, the integration can be realized by using a common winding, so that the whole converter only contains one magnetic element, thereby reducing the volume and the weight of the whole magnetic element, improving the power density and the efficiency and facilitating the practical design and application. Compared with the UU-shaped magnetic core 100, the winding coils are arranged on both sides of the UU-shaped magnetic core 100, so that the magnetic integrated device is in a square structure, the winding is complex, and the magnetic integrated device is difficult to adapt to a long and narrow heat dissipation cavity; or PQ magnetic core 100 only sets up the winding coil at the center pillar of E type magnetism, and it is relatively poor to lead to the integrated device heat dissipation of magnetism, and power density is low, the utility model discloses a U type core post 110 and I type core post 120 constitute magnetic core 100 to with first winding 200 and second winding 300 respectively around locating on the I type core post 120, only wind on a magnetic core 100 post, the wire winding is simple, need not wind in the two times of magnetic core 100 posts, can reduce the volume of the integrated device of magnetism, be favorable to being adapted to the heat dissipation cavity of long narrow shape.

It can be understood that, in the embodiment where the first winding 200 includes the primary inductance winding LP1 and the transformer primary winding LP2, and the second winding 300 includes the secondary inductance winding LS1 and the transformer secondary winding LS2, the primary inductance winding LP1, the transformer primary winding LP2, the secondary inductance winding LS1, and the transformer secondary winding LS2 are wound on the I-type magnetic core column 120, different from the conventional discrete structure, the utility model discloses carry out magnetic circuit coupling integration with the transformer and two inductors, that is, two inductors share the magnetic core 100 and the winding with the transformer, when the magnetic integration device is applied to the bidirectional DCDC topology, the problem of thermal symmetry of the transformer during positive and negative energy transmission can be solved, and the problem that magnetic integration is difficult to realize in the long and narrow cavity.

Referring to fig. 1 to 3, in an embodiment, the I-shaped core leg 120 has a circular or quasi-circular cross section, and the U-shaped core leg 130 has a rectangular cross section;

the cross-sectional area of the I-shaped core leg 120 is equal to the cross-sectional area of the U-shaped core leg 130.

In this embodiment, the cross section of the I-shaped core leg 120 may be circular or circular-like, for example, a rounded rectangle, the cross section of the U-shaped core part is rectangular, and the cross sections of the I-shaped core leg 120 and the U-shaped core leg 130 are equal, so that the first winding 200 and the second winding 300 are advantageously wound on the I-shaped core leg 120.

Referring to fig. 1 to 3, referring to a difference in a circuit according to an application of the magnetic integrated device, in an embodiment, the magnetic integrated device further includes:

the excitation inductance winding LP3 is wound on the I-shaped magnetic core column 120; the excitation inductance winding LP3 is arranged in parallel with the primary inductance winding LP 1.

In this embodiment, the excitation inductance winding LP3 may be disposed in series with the primary inductance winding LP1, or in parallel with the primary inductance winding LP1, the primary inductance winding LP1 is wound around the I-type core leg 120 to form a resonant inductance, and the excitation inductance winding LP3 is wound around the I-type core leg 120 to form an excitation inductance. When the resonant inductor and the excitation inductor are applied to an isolated switching power supply, for example, in a circuit such as a DC-DC circuit, the resonant inductor and the excitation inductor may further form a resonant circuit with a resonant capacitor, for example, an LLC resonant circuit, or an LCL resonant circuit, etc., in the LLC resonant circuit, the resonant capacitor is sequentially connected in series with the resonant inductor and the excitation inductor to form a resonant cavity. Of course, in other embodiments, the resonant inductor may also utilize the leakage inductance of the transformer. The resonant circuit consisting of the excitation inductor, the primary winding LP2 of the transformer, the resonant capacitor and the resonant inductor can realize energy transmission, thereby realizing the isolated output of electric energy.

Referring to fig. 1 to 3, in an embodiment, an air gap 120a is disposed on the I-shaped core leg 120.

In this embodiment, the air gap 120a may be filled with a non-magnetic material, such as an epoxy board, or a magnetic conductive material having a magnetic permeability smaller than the relative magnetic permeability of the magnetic material used for the winding posts. The air gap 120a has large magnetic resistance, can prevent magnetic saturation, reduces magnetic conductivity, and thus, under the premise that the magnetic core 100 is not saturated, the winding post has anti-saturation characteristics, and in addition, through the arrangement of the air gaps 120a, the heat radiation performance of the reactor can be better. Through the arrangement of the air gap 120a, inductance integration is realized by using leakage inductance formed by leakage flux on the magnetic core 100 of the transformer, so that the primary inductance coil and the secondary inductance coil wound on the I-type magnetic core 100 can form two independent inductances. The air gap 120a between each coil is large, and the magnetic field generator has the characteristics of large leakage inductance and small excitation inductance, so that high gain is realized by using the excitation inductance.

Referring to fig. 1 to 3, in an embodiment, a bottom pillar of the U-shaped core leg 110 and the I-shaped core leg 120 are spaced apart from each other;

the thickness of the bottom pillar of the U-shaped core pillar 110 is smaller than the thickness of the I-shaped core pillar 120.

In this embodiment, the first and

second windings

200 and 300 form a plurality of magnetic circuits between the closed frame formed by the I-core leg 120 and the U-core leg 110. First winding 200 and second winding 300 are on coiling I type magnetic core post 120, because do not need to coil the winding coil on U type magnetic core post 110, consequently the thickness of the base pillar edge column direction of attenuate U type magnetic core post 110 that can be appropriate for the thickness of the base pillar edge column direction of U type magnetic core post 110 is less than the thickness of I type magnetic core post 120 edge column direction, do not have the wire winding moreover, and the size of whole magnetism integrated device width direction reduces, so, can reduce the volume and the weight etc. of magnetism integrated device.

The utility model also provides an isolated form switching power supply, include as foretell magnetism integrated device.

The detailed structure of the magnetic integrated device can refer to the above embodiments, and is not described herein; it can be understood that, because the utility model discloses above-mentioned magnetism integrated device has been used among the isolated form switching power supply, consequently, the utility model discloses isolated form switching power supply's embodiment includes all technical scheme of the whole embodiments of above-mentioned magnetism integrated device, and the technical effect who reaches is also identical, no longer gives unnecessary details here.

When the magnetic integration device is applied to a bidirectional DC-DC converter, a transformer and two inductors can be integrated in the same magnetic integration device, the two inductors share the magnetic core 100 and the winding with the transformer, and the problems that the thermal design of the transformer is asymmetric and the magnetic integration is difficult to realize in a long and narrow cavity can be solved.

And the isolated switching power supply also comprises a resonant capacitor, the resonant capacitor is electrically connected with the magnetic integrated device, the resonant capacitor comprises a primary resonant capacitor and a secondary resonant capacitor, and the primary resonant capacitor, the secondary resonant capacitor and the magnetic integrated device form a CLLLC type converter or a DAB type converter.

In an embodiment, the isolated switching power supply further includes:

In this embodiment, the magnetic integrated device may be accommodated in the heat dissipation cavity of the heat sink, and when a gap is formed between the inner side surface of the heat dissipation cavity of the heat sink and the outer peripheral surface of each winding, the gap may be filled with a heat-conducting material, so as to improve the heat exchange efficiency between the heat sink and the winding to the maximum extent. The radiator can be used for air-cooling heat dissipation or liquid-cooling heat dissipation, and heat generated during the working of the magnetic integrated device is conducted to the radiator, so that the heat dissipation of the magnetic integrated device is realized through the high heat dissipation efficiency of the radiator.

The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A magnetically integrated device, comprising:

2. The magnetically integrated device of claim 1, wherein the first winding comprises:

3. The magnetic integrated device of claim 1, wherein the I-shaped core leg cross-section is arranged in a circular or quasi-circular shape, and the U-shaped core leg cross-section is arranged in a rectangular shape;

4. The magnetically integrated device of claim 1, wherein the second winding comprises:

5. The magnetic integrated device of claim 1, wherein the first winding is a primary winding of a transformer and the second winding is a secondary winding of the transformer.

6. The magnetically integrated device of claim 1, wherein an air gap is disposed in the I-core leg.

7. The magnetically integrated device of any one of claims 1 to 6, wherein the bottom pillar of the U-shaped core pillar is spaced apart from the I-shaped core pillar;

8. An isolated switching power supply comprising a magnetically integrated device according to any one of claims 1 to 6.

9. The isolated switching power supply of claim 8 further comprising a resonant capacitor electrically connected to the magnetically integrated device.

10. The isolated switching power supply of claim 8, further comprising: