Current-doubling rectification magnetic integrated transformer

Abstract

The invention relates to a current-doubling rectification magnetic integrated transformer. Comprising a magnetic core assembly, a primary winding and a secondary winding, the magnetic core assembly comprises a middle column and two side columns; the primary winding and the secondary winding are respectively wound on the side columns to form a closed magnetic flux loop; the middle column is made of a composite magnetic conductive material; the saturation flux density of the composite magnetic conductive material is greater than 0.5 T; the initial value of the relative permeability of the composite magnetic conductive material is relatively low and is reduced along with the increase of the load current. According to the invention, the problem that it is difficult to balance anti-saturation, filtering and quick response in a full-load range in the prior art is solved; anti-saturation, filtering and quick response in a full-load range are balanced; moreover, the composite magnetic conductive material replaces a centralized air gap, thereby facilitating the reduction of scattered magnetic flux, and further facilitating the reduction of the eddy current loss of the winding.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to a current-doubler rectifier magnetic integrated transformer. BACKGROUND

[0002] The current-doubler rectifier magnetic integrated transformer integrates a transformer and a filter inductor on one component. A conventional scheme usually adopts an EE-type ferrite core, and primary and secondary windings are wound on the two side legs respectively. To prevent transformer saturation, an air gap is provided on the core. The air gap position can be selected to be only on the side leg, only on the middle leg, or both the side leg and the middle leg. However, the inductance of the integrated inductor is inversely proportional to the air gap. When the power level is increased, the air gap usually needs to be increased to avoid core saturation, but this will cause the inductance to be relatively insufficient under light load conditions, thereby increasing the current ripple. More importantly, the increase of the air gap aggravates the edge magnetic flux effect, significantly increasing the eddy current loss in the winding, resulting in an increase in temperature rise. The temperature rise in turn limits the power handling capability of the magnetic component, forming a bottleneck.

[0003] There is currently no effective solution to the problem that it is difficult to balance the anti-saturation, filtering and fast response in the full load range in the related art. SUMMARY

[0004] A current-doubler rectifier magnetic integrated transformer is provided in the present embodiment to solve the problem that it is difficult to balance the anti-saturation, filtering and fast response in the full load range in the related art.

[0005] In a first aspect, a current-doubler rectifier magnetic integrated transformer is provided in the present embodiment, comprising: a magnetic core assembly, a primary winding and a secondary winding;

[0006] The magnetic core assembly comprises a middle leg and two side legs; the primary winding and the secondary winding are wound on the side legs to form a closed magnetic flux loop;

[0007] The middle leg is made of a composite magnetic material; the saturation magnetic flux density of the composite magnetic material is greater than 0.5T; the initial value of the relative permeability of the composite magnetic material is low and decreases with the increase of the load current.

[0008] In some embodiments thereof, the composite magnetic material at least contains iron-silicon-aluminum or iron-silicon.

[0009] In some embodiments thereof, the initial value of the relative permeability of the composite magnetic material is less than 200.

[0010] In some embodiments thereof, the material of the side leg at least contains ferrite, amorphous or nanocrystalline.

[0011] In some embodiments, the circuit structure of the current doubling rectification magnetic integrated transformer is a primary side forward winding current doubling rectification circuit, and air gaps are formed in the side columns.

[0012] In some embodiments, the size of the air gap in the side column is less than a preset size threshold.

[0013] In some embodiments, the circuit structure of the current doubling rectification magnetic integrated transformer is a primary side reverse winding current doubling rectification circuit, and part of the middle column is made of a composite magnetic conductive material.

[0014] In some embodiments, the side column and / or the middle column has an air gap.

[0015] In some embodiments, the air gap is a segmented air gap.

[0016] Compared with related technologies, the current doubling rectification magnetic integrated transformer provided in the embodiments includes a magnetic core assembly, a primary side winding, and a secondary side winding; the magnetic core assembly includes a middle column and two side columns; the primary side winding and the secondary side winding are wound on the side columns to form a closed magnetic flux loop; the middle column is made of a composite magnetic conductive material; the saturation magnetic flux density of the composite magnetic conductive material is greater than 0.5T; the initial value of the relative permeability of the composite magnetic conductive material is low, and decreases with the increase of the load current, so that the filter can be strengthened at light load without air gap, the response speed is not reduced, the inductance can be reduced at heavy load to ensure the response speed, and the magnetic core saturation can be avoided. Moreover, the composite magnetic conductive material replaces the centralized air gap, which is conducive to reducing the stray flux, and in turn reducing the eddy current loss of the winding.

[0017] Details of one or more embodiments of the present application are presented in the following drawings and description to make other features, objects, and advantages of the present application more apparent. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 is a structural block diagram of a primary side forward winding current doubling rectification magnetic integrated transformer provided by an embodiment of the present application;

[0020] Figure 2 is an electrical schematic diagram of a primary side forward winding current doubling rectification circuit provided by an embodiment of the present application;

[0021] Figure 3 is a structural block diagram of a primary side reverse winding current doubling rectification magnetic integrated transformer provided by another embodiment of the present application;

[0022] Figure 4 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is an electrical schematic diagram of the primary side reverse winding current doubling rectifier circuit;

[0023] Figure 5 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is a simulation waveform diagram based on the primary side reverse winding current doubling rectifier circuit;

[0024] Figure 6 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is a simulation waveform diagram based on the primary side reverse winding current doubling rectifier circuit;

[0025] Figure 7 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is a schematic diagram of the integrated inductor with the middle column replaced by Fe-Si-Al based on the primary side reverse winding current doubling rectifier circuit;

[0026] Figure 8 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is a schematic diagram of the saturation magnetic flux density with the middle column replaced by Fe-Si-Al based on the primary side reverse winding current doubling rectifier circuit;

[0027] Figure 9 is the primary side reverse winding current doubling rectifier circuit provided by an embodiment of the present application, and is a magnetic loss comparison schematic diagram.

[0028] In the figure: 100, magnetic core assembly; 200, primary side winding; 300, secondary side winding. DETAILED DESCRIPTION

[0029] In order to more clearly understand the purpose, technical scheme and advantages of the present application, the present application is described and explained below in combination with the drawings and embodiments.

[0030] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as those commonly understood by a person with ordinary skill in the art to which the present application belongs. In the present application, "one", "a", "an", "the", "these", and similar words do not represent a quantitative limitation, and they can be singular or plural. In the present application, the terms "include", "contain", "have", and any variants thereof are intended to cover non-exclusive inclusion; for example, a process, method, and system, product or device containing a series of steps or modules (units) are not limited to the listed steps or modules (units), but can include steps or modules (units) not listed, or can include other steps or modules (units) inherent to the process, method, product or device. In the present application, the terms "connected", "connected", "coupled" and the like do not limit to physical or mechanical connection, but can include electrical connection, whether direct or indirect. In the present application, "multiple" means two or more. "And / or" describes the relationship between the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. Generally, the character " / " represents an "or" relationship between the objects before and after. In the present application, the terms "first", "second", "third", and the like are only used to distinguish similar objects, and do not represent a specific order for the objects.

[0031] In the present embodiment, a current doubling rectification magnetic integrated transformer is provided, as shown in Figure 1 、 Figure 3 The current doubling rectification magnetic integrated transformer comprises a magnetic core assembly 100, a primary winding 200, and a secondary winding 300.

[0032] The magnetic core assembly 100 comprises a middle column and two side columns; the primary winding 200 and the secondary winding 300 are wound on the side columns to form a closed magnetic flux loop.

[0033] The middle column is made of a composite magnetic conductive material; the saturation magnetic flux density of the composite magnetic conductive material is greater than 0.5T; the initial value of the relative permeability of the composite magnetic conductive material is low, and decreases with the increase of the load current.

[0034] Specifically, the current doubling rectification magnetic integrated transformer integrates the transformer and the filter inductor on one element. The current doubling rectification magnetic integrated transformer of the present embodiment is an integrated structure; specifically, it comprises a magnetic core assembly 100, a primary winding 200, and a secondary winding 300; the magnetic core assembly 100 comprises a middle column and two side columns; the primary winding 200 and the secondary winding 300 are wound on the side columns to form a closed magnetic flux loop, so that all windings share the same closed magnetic circuit, improving the power density.

[0035] The magnetic core assembly 100 comprises a center column and two side columns, and the material of the side columns is not limited in the embodiment; the center column is made of a composite magnetic conductive material; and the indexes of the composite magnetic conductive material are saturation magnetic flux density, relative magnetic permeability and magnetic loss.

[0036] The saturation magnetic flux density of the composite magnetic conductive material is greater than 0.5T. Since the saturation magnetic flux density of ferrite is generally not more than 0.5T, the saturation magnetic flux density of the composite magnetic conductive material is greater than 0.5T, which can resist saturation without opening an air gap, and reduces the winding eddy current loss caused by the magnetic flux dispersion of the air gap in the prior art.

[0037] The initial value of the relative magnetic permeability of the composite magnetic conductive material is low, and decreases with the increase of the load current, so that the integrated inductance decreases with the increase of the load current, thereby achieving the purpose of strengthening filtering under light load, reducing the inductance under heavy load to improve the response speed, and balancing the anti-saturation, filtering and fast response in the full load range. The initial value of the relative magnetic permeability of the composite magnetic conductive material can be less than 200. It is also because the initial value of the relative magnetic permeability of the composite magnetic conductive material is low that the composite magnetic conductive material can be used to replace the ferrite with an air gap. If only the saturation magnetic flux density is high, it is still not suitable. For example, the saturation magnetic flux density of nanocrystalline is more than 1T, which is still not suitable, because the magnetic permeability is too high and it is easy to saturate.

[0038] Since the magnetic loss is proportional to the frequency and the magnetic flux swing. The composite magnetic material usually has a larger loss than the ferrite, so it is necessary to compromise the electrical performance and the loss. In the related art, the EE type ferrite core is usually used, and the primary winding and the secondary winding 300 are wound on the two side legs respectively. In order to prevent the transformer from being saturated, an air gap is needed to be opened on the core. The air gap position can be selected to be opened only on the side leg, only on the center leg, or on both the side leg and the center leg. However, the inductance of the integrated inductor is inversely proportional to the air gap. When the power level is increased, it is usually necessary to increase the air gap to avoid the core saturation, but this will cause the inductance to be relatively insufficient under the light load condition, and further increase the current ripple. More importantly, the increase of the air gap aggravates the edge magnetic flux effect, and the eddy current loss in the winding is significantly increased, which causes the temperature rise to be intensified, and in turn limits the power handling capability of the magnetic component, forming a bottleneck. In the embodiment, the current doubling rectification magnetic integrated transformer includes a core assembly 100, a primary winding 200, and a secondary winding 300; the core assembly 100 includes a center leg and two side legs; the primary winding 200 and the secondary winding 300 are wound on the side legs to form a closed magnetic flux loop; the center leg is made of a composite magnetic material; the saturation magnetic flux density of the composite magnetic material is greater than 0.5T; the initial value of the relative magnetic permeability of the composite magnetic material is low, and decreases with the increase of the load current, so that the air gap can be opened without reducing the response speed under the light load condition, and the inductance can be reduced to ensure the response speed under the heavy load condition, and the core saturation can also be avoided. Moreover, the composite magnetic material replaces the centralized air gap, which is beneficial to reduce the stray magnetic flux, and in turn is beneficial to reduce the eddy current loss of the winding; and the problem of difficult balance between anti-saturation, filtering and fast response in the related art under the full load range is solved.

[0039] In addition, the core structure in the core assembly 100 includes but is not limited to the structure formed by the EE core. Any core assembly 100 with two side legs and a center leg belongs to the protection scope of the present application.

[0040] The above components are described in detail as follows:

[0041] It should be noted that the winding adopts different winding methods, which will affect the direction of the magnetic flux. In the embodiment, the primary winding 200 adopts different winding methods to form two current doubling rectification magnetic integrated transformers (as shown in Figure 1 and Figure 3 ). Figure 1 is a current doubling rectification magnetic integrated transformer with forward winding of the primary winding, and the corresponding electrical schematic diagram is Figure 2 (forward winding current doubling rectification circuit of the primary winding). Figure 3 is a current doubling rectification magnetic integrated transformer with reverse winding of the primary winding, and the corresponding electrical schematic diagram is Figure 4 (reverse winding current doubling rectification circuit of the primary winding).

[0042] In some embodiments, the composite magnetic conductive material at least comprises ferrosilicon aluminum or ferrosilicon.

[0043] Specifically, ferrosilicon aluminum refers to an alloy of a material mainly composed of iron, silicon and aluminum, the relative permeability of which decreases with the increase of load current, the saturation magnetic flux density is between 1.0-1.2T, and it has high resistivity, low eddy current loss, high hardness and moderate cost, and is suitable for large current energy storage scenarios. Similarly, ferrosilicon refers to an alloy of a material mainly composed of iron and silicon. In other embodiments, other alloys meeting the above indicators can also be used to make the middle column, which is not limited.

[0044] Through the embodiment, the composite magnetic conductive material is ferrosilicon aluminum or ferrosilicon, which can cover different scene requirements and balance the anti-saturation, filtering and fast response in the full load range.

[0045] In some embodiments, the relative permeability of the composite magnetic conductive material is less than 200.

[0046] Specifically, the magnetic permeability of the composite magnetic conductive material can be considered to be much lower than that of ferrite, amorphous or nanocrystalline. For example, the relative permeability of the composite magnetic conductive material can be 19.

[0047] In some embodiments, the material of the side column at least comprises ferrite, amorphous or nanocrystalline.

[0048] Specifically, the side column is made of ferrite, amorphous or nanocrystalline; for example, the side column made of ferrite has high magnetic permeability, low iron loss and good high-frequency characteristics. Since the saturation magnetic flux density of ferrite is generally not more than 0.5T, in order to prevent the integrated inductor from saturating, it can be used in cooperation with the middle column made of composite magnetic conductive material to improve the overall saturation magnetic flux density.

[0049] Through the embodiment, the side column made of ferrite, amorphous or nanocrystalline can inherit the characteristics of low iron loss and good high-frequency characteristics, effectively control the cost; and the cooperation with the middle column made of composite magnetic conductive material can further balance the anti-saturation, filtering and fast response in the full load range.

[0050] In some embodiments, the circuit structure of the current doubling rectification magnetic integrated transformer is a primary side forward winding current doubling rectification circuit, and air gaps are opened in the two side columns.

[0051] Specifically, the primary side forward winding current doubling rectification circuit is as shown in Figure 2 The magnetic resistance of the two side columns is R0; the magnetic flux of the two side columns is and The magnetic resistance of the middle column is RC; the magnetic flux of the middle column is a, b, c, d, e are the end points of the primary and secondary winding. The integrated inductor The expression is:

[0052]

[0053] In formula (1), NS is the number of turns of the secondary winding.

[0054] In this embodiment, the side column can be considered as a ferrite core, which has high permeability, low iron loss and good high frequency characteristics. Since the saturation magnetic flux density of ferrite is generally not more than 0.5T, in order to prevent the integrated inductor from saturating, an air gap can be provided in the side column to increase the magnetic resistance R0. However, the use of an air gap has the following disadvantages: 1. The air gap will increase the stray magnetic flux, which in turn increases the eddy current loss of the winding and reduces the efficiency and increases the temperature rise; 2. At the same average power, the transformer operating in pulse mode requires a larger air gap than the transformer operating in steady state mode to prevent the core from saturating, which will result in a lower inductance at light load, which in turn increases the current ripple at light load and further increases the eddy current loss. For the first disadvantage, segmented air gaps can be used to improve it. Among them, the segmented air gap is a parallel air gap, a distributed air gap and a stepped air gap, etc. However, when the number of segments reaches a certain number, such as 3 segments or more, the further improvement effect is limited, and the production difficulty is increased. However, for the second disadvantage, the middle column is replaced by a composite magnetic material core to solve the problem. Of course, after the replacement, air gaps can also be provided on the two side columns, but the size of the air gap is smaller than the preset size threshold; the size threshold refers to the size (length, width, etc.) required to be provided in the existing core assembly (all made of materials with relative permeability >1000) The size threshold can be adjusted according to the application scenario, which is not limited.

[0055] The following takes the primary side forward winding current doubling rectifier circuit as an example to illustrate as follows:

[0056] In one switching cycle of the front-stage power electronic circuit (such as a phase-shifted full-bridge), the time periods are respectively [0, 0.5DTs], [0.5DTs, 0.5Ts], [0.5Ts, 0.5(1+D)Ts] and [0.5(1+D)Ts, Ts]; wherein, D is the duty ratio, and Ts is the switching cycle, then the magnetic flux change rates of the magnetic columns are shown in formula (2)~formula (4);

[0057]

[0058]

[0059]

[0060] In the formula, and are the DC bus voltage and output voltage of the phase-shifted full-bridge circuit, respectively; N is the number of turns of the primary winding. The corresponding simulation waveform diagram is shown in FIG. 2B. It can be seen that the edge column flows through the magnetic flux with the switching frequency as the fundamental wave, and the magnetic flux swing is large. If it is replaced by FeSiAl, a large magnetic core loss will be generated. Figure 5

[0061] In some embodiments, the circuit structure of the current doubling rectification magnetic integrated transformer is a primary winding reverse winding current doubling rectification circuit, and the edge column and / or the middle column is provided with an air gap.

[0062] Specifically, the primary winding reverse winding current doubling rectification circuit is shown in FIG. 3A, and the integrated inductor is shown in FIG. 3B. Figure 4 The expression of the integrated inductor is as follows:

[0063]

[0064] In the present embodiment, the edge column can be considered as a ferrite magnetic core, which has high magnetic permeability, low iron loss and good high frequency characteristics. Since the saturation magnetic density of ferrite is generally not more than 0.5T, in order to prevent the integrated inductor from being saturated, an air gap can be provided in the edge column and / or the middle column to increase the corresponding magnetic resistance. However, there are two disadvantages caused by the air gap. In the present embodiment, segmented air gaps can be used to improve the first disadvantage. The air gaps are one of parallel air gaps, distributed air gaps and stepped air gaps. For the second disadvantage, the middle column is completely or partially replaced by a composite magnetic material magnetic core to solve the problem. After the replacement, the edge column and / or the middle column can be provided with an air gap, and the size of the air gap is smaller than a preset size threshold. The size threshold refers to the size (length, width, etc.) required to be provided in the existing magnetic core assembly (made of a material with a relative magnetic permeability >1000), and the size threshold can be adjusted according to the application scenario, which is not limited.

[0065] The following will take the primary winding reverse winding current doubling rectification circuit as an example to illustrate as follows:

[0066] In one switching cycle of the front-stage power electronic circuit (such as a phase-shifted full-bridge), the time periods are respectively [0, 0.5DTs], [0.5DTs, 0.5Ts], [0.5Ts, 0.5(1+D)Ts] and [0.5(1+D)Ts, Ts]; wherein, D is the duty ratio, and Ts is the switching cycle; the magnetic flux change rates of the magnetic columns in one switching cycle are shown in equations (6)-(8).

[0067]

[0068]

[0069] ​​​

[0070] Although its edge column also flows through the base wave with the switching frequency, and the magnetic flux with large amplitude, however, the column flows through the base wave with 2 times the switching frequency, and the magnetic flux with small amplitude; the corresponding simulation waveform diagram is shown in the above formula. Therefore, it can be made of part or all of the middle column of ferrosilicon aluminum (composite magnetic material), and the edge column is not opened. Although the magnetic flux flowing through the ferrosilicon aluminum increases by one time, the magnetic loss is still low due to the smaller amplitude. Figure 6

[0071] Further, the edge column and / or the middle column can be provided with an air gap, and the size of the air gap is less than a preset size threshold. The size threshold refers to the size (length, width, etc.) required to normally use a ferrite core. The size threshold can be adjusted according to the application scenario.

[0072] Based on Figure 4 , the calculation results of the integrated inductor (filter inductor) and the saturation magnetic flux density of the middle column replaced by ferrosilicon aluminum are shown in Figure 7 and 8 . It can be seen from Figure 7 that since the relative permeability of ferrosilicon aluminum decreases with the increase of load current, the integrated inductor also decreases with the increase of load current. Generally, under light load conditions, the instantaneous response speed is fast due to the distance from the physical limit of the converter. At this time, it is more critical to limit the output noise, and increasing the filter inductor can effectively reduce the noise. Under heavy load conditions, the physical limit of the converter has been approached, and it is more necessary to reduce the inductor to improve the response speed. At this time, noise is not critical. Therefore, after using ferrosilicon aluminum, the noise reduction demand under light load and the fast response demand under heavy load can be more effectively balanced. It can be seen from Figure 8 that under the entire load range, whether the maximum magnetic flux density Bo,max of the edge column or the maximum magnetic flux density Bc,max of the middle column is lower than the saturation magnetic flux density, which meets the demand of the target design.

[0073] Further, taking the magnetic loss data manual of a certain ferrosilicon aluminum manufacturer as an example, Figure 9 the magnetic loss of ferrosilicon aluminum applied to different types of transformers (the edge column of the original edge forward winding current doubling rectifier circuit is made of the ferrosilicon aluminum; the middle column of the original edge reverse winding current doubling rectifier circuit is made of the ferrosilicon aluminum) is evaluated, Figure 9 The parameters in CV : mw / cm 3 ; B M : kGauss; f: kHZ; P CV =2.6529×B M 1.8656 ×f+0.0065×(B m f) 2 ; it can be seen that the ferrosilicon aluminum is applied to Figure 4 ​On the central column, the magnetic loss per unit volume is applied in Figure 2 27% of the volume of the side pillars. Considering that the sum of the volumes of the two side pillars is greater than that of the central pillar, Figure 4 The iron-silicon-aluminum loss is even less Figure 2 19%.

[0074] Based on this, Figure 4 Based on this, the scheme of using composite magnetic materials for all or part of the center column has the following advantages: 1. The saturation magnetic flux density of composite magnetic materials is much higher than that of ferrite, thus improving the transformer's anti-saturation capability. 2. Although the unit loss of composite magnetic materials is higher than that of ferrite, the magnetic swing of the center column is smaller, that is, the actual magnetic loss is not significant. 3. The initial relative permeability of composite magnetic materials is lower and decreases with increasing load current, resulting in a large inductance under light load and a low inductance under heavy load, which perfectly balances the power supply's anti-saturation, filtering, and transient response across the entire load range.

[0075] In some of these embodiments, such as Figure 2 and Figure 4 As shown, an auxiliary circuit and load can be set up to work with the transformer; the auxiliary circuit is set between the magnetic core assembly and the load to rectify and filter the voltage and current generated by the closed magnetic flux loop; the auxiliary circuit includes diode D1, diode D2 and capacitor C1;

[0076] The two secondary windings are connected to the anodes of diodes D1 and D2, respectively; the cathodes of diodes D1 and D2 are connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the corresponding terminals of the two secondary windings.

[0077] Specifically, the cooperation of diodes D1 and D2 rectifyes the current and voltage generated in the closed magnetic flux loop; the integrated inductor formed by the magnetic core assembly, primary winding, and secondary winding filters the current generated in the closed magnetic flux loop, and connects it to the load (the load is in...). Figure 2 and Figure 4 The capacitor C1 connected in parallel (as shown in the diagram, Rload) can filter the voltage generated by the closed magnetic flux loop, thereby filtering the current and inductance. Furthermore, through the cooperation of the two diodes, current is alternately supplied to the load, making the load current twice that of a single diode (increasing current capacity) to achieve efficient operation of the entire circuit.

[0078] In other embodiments, diodes D1 and D2 can be connected in the opposite manner to those described above; that is, the two secondary windings are respectively connected to the cathodes of diodes D1 and D2; the anodes of diodes D1 and D2 are connected to one end of capacitor C1; the auxiliary circuit can also be implemented by other equivalent circuits, and there are no restrictions on this.

[0079] It should be noted that the specific examples in the present embodiment can refer to the examples described in the above embodiments and optional implementation manners, and will not be described herein again.

[0080] It should be understood that the specific embodiments described herein are merely exemplary and are not intended to limit the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided herein without creative labor are within the scope of the present application.

[0081] Obviously, the drawings are only some examples or embodiments of the present application, and those skilled in the art can also apply the present application to other similar situations without creative labor. In addition, it can be understood that although the work done in the development process may be complex and long, some design, manufacture or production changes made by those skilled in the art according to the technical content disclosed in the present application are only routine technical means and should not be regarded as insufficient disclosure of the present application.

[0082] The word "embodiment" in the present application means that the specific features, structures or characteristics described in combination with the embodiments can be included in the embodiments of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean independence or alternatives to other embodiments. It can be clearly or implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0083] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of patent protection. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A magnetic integrated transformer with current doubling rectification, characterized by, The application relates to a magnetic integrated transformer with a magnetic core assembly, a primary winding and a secondary winding. The magnetic core assembly comprises a middle column and two side columns; the primary winding and the secondary winding are wound around the side columns to form a closed magnetic flux loop. The middle column is made of a composite magnetic conductive material; the saturation magnetic flux density of the composite magnetic conductive material is greater than 0.5T; the initial value of the relative magnetic permeability of the composite magnetic conductive material is low, and decreases with the increase of the load current. The composite magnetic conductive material at least contains iron-silicon-aluminum or iron-silicon.

2. The current-sharing rectifying magnetic integrated transformer according to claim 1, characterized in that, The initial value of the relative magnetic permeability of the composite magnetic conductive material is less than 200.

3. The current-sharing rectifying magnetic integrated transformer according to claim 1, characterized in that, The material of the side column at least contains ferrite, amorphous or nanocrystalline.

4. The current-sharing rectifying magnetic integrated transformer according to claim 1, characterized in that, The circuit structure of the magnetic integrated transformer is a primary winding forward winding current doubling rectification circuit, and air gaps are formed in the two side columns.

5. The current-sharing rectifying magnetic integrated transformer according to claim 1, characterized in that, The size of the air gap in the side column is less than a preset size threshold.

6. The current-sharing rectifying magnetic integrated transformer according to claim 5, characterized in that, The circuit structure of the magnetic integrated transformer is a primary winding reverse winding current doubling rectification circuit, and part of the middle column is made of a composite magnetic conductive material.

7. The current-sharing rectifying magnetic integrated transformer of claim 1, wherein, Air gaps are formed in the side column and / or the middle column.

8. The current-sharing rectifying magnetic integrated transformer according to claim 7, characterized in that, The air gap is a segmented air gap.

9. The current sharing rectifying magnetic integrated transformer according to any one of claims 5 or 8, characterized in that, ​

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