Magnetic integrated transformer, switching power supply and electric appliance
By integrating the transformer and resonant inductor into one magnetic component, using the core and winding structure of five magnetic columns, the problem of insufficient space utilization in traditional magnetic component design is solved, miniaturization and cost reduction are achieved.
Patent Information
- Application Number
- CN202421446786.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-21
AI Technical Summary
In traditional magnetic component design, the winding and the magnetic core occupy space respectively, resulting in insufficient space utilization and difficult to achieve miniaturization.
A magnetic integrated transformer is designed to integrate the transformer and resonant inductor into a magnetic component, and the outer leakage magnetic field is reduced through the core and winding structure of five magnetic columns, and the primary and secondary edge leakage inductance is adjusted through the air gap.
It effectively reduces the space occupation of transformers and resonant inductors, reduces costs, and improves the space utilization of magnetic components.
Smart Images
Figure CN222785134U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of switching power supplies, and in particular to a magnetic integrated transformer, a switching power supply and an electrical appliance. Background Art
[0002] As the switching power supply has higher requirements for volume, higher requirements are also placed on the space occupied by magnetic components such as transformers and inductors. In traditional magnetic component designs, windings and magnetic cores often need to occupy space separately, resulting in insufficient space utilization and unsatisfactory technical problems in miniaturization of magnetic components. Utility Model Content
[0003] The purpose of the embodiments of the present application is to provide a magnetic integrated transformer, a switching power supply and an electrical appliance, which can integrate a transformer and a resonant inductor into one magnetic component, effectively reducing space occupancy and reducing volume.
[0004] One aspect of an embodiment of the present application provides a magnetic integrated transformer. The magnetic integrated transformer includes a magnetic core and a winding, the magnetic core includes a first magnetic column, a second magnetic column, a third magnetic column, a fourth magnetic column and a fifth magnetic column, the second magnetic column and the third magnetic column are distributed on opposite sides of the first magnetic column, the fourth magnetic column and the fifth magnetic column are respectively located on the outside of the second magnetic column and the third magnetic column, and the winding is respectively wound on the second magnetic column and the third magnetic column.
[0005] Furthermore, the first magnetic column, the second magnetic column, the third magnetic column, the fourth magnetic column and the fifth magnetic column all have air gaps.
[0006] Furthermore, the winding includes a primary winding and a secondary winding, and the primary winding and the secondary winding are wound on both the second magnetic column and the third magnetic column.
[0007] Furthermore, at least one of the primary winding and the secondary winding is unevenly distributed on the second magnetic column and the third magnetic column.
[0008] Furthermore, the primary windings wound on the second magnetic column and the third magnetic column are connected in series, the secondary windings wound on the second magnetic column and the third magnetic column are connected in series, and the primary windings and the secondary windings are unevenly distributed on the second magnetic column and the third magnetic column.
[0009] Furthermore, the primary windings wound on the second magnetic column and the third magnetic column are connected in series, the secondary windings wound on the second magnetic column and the third magnetic column are connected in parallel or in series, the primary windings are unevenly distributed on the second magnetic column and the third magnetic column, and the secondary windings are evenly distributed on the second magnetic column and the third magnetic column.
[0010] Furthermore, the second magnetic column and the third magnetic column have the same length and cross-sectional area, and the second magnetic column and the third magnetic column have the same or different shapes; the fourth magnetic column and the fifth magnetic column have the same length and cross-sectional area, and the fourth magnetic column and the fifth magnetic column have the same or different shapes; the second magnetic column and the third magnetic column have the same air gap length, and the fourth magnetic column and the fifth magnetic column have the same air gap length.
[0011] Furthermore, the magnetic integrated transformer includes two magnetic cores that are symmetrically assembled.
[0012] Furthermore, a slot is provided in the middle of the first magnetic column to facilitate wiring.
[0013] Furthermore, the magnetic core is provided with openings for adding potting glue at positions corresponding to the slots.
[0014] Another aspect of the embodiments of the present application provides a switching power supply, wherein the switching power supply includes the magnetic integrated transformer as described above.
[0015] Another aspect of the embodiments of the present application provides an electrical appliance, wherein the electrical appliance comprises the switching power supply as described above.
[0016] The magnetic integrated transformer of the present application integrates the transformer and the resonant inductor into one magnetic component, which can effectively reduce the space occupied by the transformer and the resonant inductor in the switching power supply and effectively reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a three-dimensional diagram of a magnetic integrated transformer according to an embodiment of the present application.
[0018] Figure 2 for Figure 1 The front view of the magnetic integrated transformer is shown.
[0019] Figure 3 This is an exploded view of a magnetic integrated transformer according to an embodiment of the present application.
[0020] Figure 4 This is a three-dimensional diagram of a magnetic core according to an embodiment of the present application.
[0021] Figure 5 for Figure 4 A top view of the magnetic core is shown.
[0022] Figure 6 This is an equivalent circuit diagram of a magnetic integrated transformer according to an embodiment of the present application.
[0023] Figure 7 This is an equivalent circuit diagram of the magnetic circuit of a magnetic integrated transformer according to an embodiment of the present application. DETAILED DESCRIPTION
[0024] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.
[0025] The magnetic integrated transformer, switching power supply and electrical appliance of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.
[0026] Figures 1 to 3 A diagram of a magnetic integrated transformer 1 according to an embodiment of the present application is disclosed, wherein: Figure 1 is a three-dimensional diagram of a magnetic integrated transformer 1, Figure 2 for Figure 1 The front view of the magnetic integrated transformer 1 is shown, Figure 3 FIG. 1 is an exploded view of the magnetic integrated transformer 1. Figures 1 to 3 As shown, a magnetic integrated transformer 1 according to an embodiment of the present application includes a magnetic core 10 and a winding 20 .
[0027] Optionally, the magnetic integrated transformer 1 of the present application includes two magnetic cores 10 that are symmetrically assembled, thereby simplifying the structure.
[0028] Figure 4 A three-dimensional diagram of a magnetic core 10 according to an embodiment of the present application is disclosed. Figure 5 Revealed Figure 4 The top view of the magnetic core 10 is shown. Figure 4 and Figure 5 As shown, the magnetic core 10 includes a first magnetic column 11, a second magnetic column 12, a third magnetic column 13, a fourth magnetic column 14 and a fifth magnetic column 15. The second magnetic column 12 and the third magnetic column 13 are distributed on two opposite sides of the first magnetic column 11, and the fourth magnetic column 14 and the fifth magnetic column 15 are respectively located outside the second magnetic column 12 and the third magnetic column 13, that is, the fourth magnetic column 14 and the fifth magnetic column 15 are also distributed on the two opposite sides of the first magnetic column 11.
[0029] The magnetic integrated transformer 1 of the present application adopts five magnetic columns, and the magnetic core 10 of the five magnetic columns can reduce the external leakage magnetic field.
[0030] First wire grooves 161 are formed on opposite sides of the first magnetic column 11, and second wire grooves 162 and third wire grooves 163 are formed on the inner sides of the fourth magnetic column 14 and the fifth magnetic column 15. The first wire grooves 161 and the second wire grooves 162 form a first annular space, and the first wire grooves 161 and the third wire grooves 163 form a second annular space.
[0031] like Figures 1 to 3 As shown, the winding 20 is wound on the second magnetic column 12 and the third magnetic column 13 respectively, and is located in the first annular space and the second annular space. Optionally, the first wire groove 161, the second wire groove 162, the third wire groove 163 and the outer surfaces of the second magnetic column 12 and the third magnetic column 13 can have a shape matching the outer surface of the winding 20.
[0032] exist Figure 3 In the embodiment shown, the winding 20 of the present application is divided into three layers, inner and outer, and is respectively wound on the second magnetic column 12 and the third magnetic column 13. It can be understood that Figure 3 The figure is only a schematic example of the winding of the winding 20 of the present application, however, the winding method of the winding 20 of the present application is not limited thereto, in other embodiments, the winding 20 of the present application can also be wound on the second magnetic column 12 and the third magnetic column 13 in two or more layers as needed, or, if the height allows, the winding 20 of the present application can also be wound on the second magnetic column 12 and the third magnetic column 13 in a single layer along the height direction. The present application does not impose any restrictions on this.
[0033] In addition, the form of the winding 20 of the present application is not limited to Figure 3 The traditional coil method is shown. In other embodiments, the winding 20 of the present application can also be applicable to various winding forms such as coils, copper bars, PCBs, etc.
[0034] like Figure 2 As shown, the first magnetic column 11 , the fourth magnetic column 14 and the fifth magnetic column 15 all have an air gap G, and the primary leakage inductance and / or the secondary leakage inductance can be adjusted by adjusting the air gap G of the first magnetic column 11 , the fourth magnetic column 14 and the fifth magnetic column 15 .
[0035] In the present application, air gaps G are provided on the first magnetic column 11, the fourth magnetic column 14 and the fifth magnetic column 15, so that distributed air gaps can be used when adjusting the primary and secondary leakage inductances. Therefore, the primary and secondary leakage inductances can be adjusted more flexibly and conveniently, effectively reducing the core loss.
[0036] The second magnetic column 12 and the third magnetic column 13 both have an air gap (not shown), and the excitation inductance of the magnetic integrated transformer 1 can be adjusted by adjusting the air gap between the second magnetic column 12 and the third magnetic column 13 .
[0037] The winding 20 includes a primary winding 21 and a secondary winding 22. In some embodiments, the primary winding 21 and the secondary winding 22 are wound on the second magnetic column 12 and the third magnetic column 13. The primary leakage inductance and / or the secondary leakage inductance can be adjusted by adjusting the number of turns of the primary winding 21 and the secondary winding 22.
[0038] like Figure 4 As shown, in some embodiments, a slot 111 is provided in the middle of the first magnetic column 11 , so as to facilitate the routing of the wires when the second magnetic column 12 and the third magnetic column 13 are wound in series.
[0039] like Figure 4 and Figure 5 Combined with Figure 1 As shown, the magnetic core 10 is provided with an opening 17 for adding potting glue at a position corresponding to the slot 111 of the first magnetic column 11. Therefore, potting glue can be added through the opening 17 during manufacturing, thereby providing effective heat dissipation for the magnetic integrated transformer 1.
[0040] In some embodiments, at least one of the primary winding 21 and the secondary winding 22 is non-uniformly distributed on the second magnetic column 12 and the third magnetic column 13, so that at least one of the primary leakage inductance and the secondary leakage inductance can be adjusted accordingly.
[0041] In one embodiment, the primary windings 21 wound on the second magnetic column 12 and the third magnetic column 13 are connected in series, and the secondary windings 22 wound on the second magnetic column 12 and the third magnetic column 13 are connected in series, and the primary windings 21 and the secondary windings 22 are unevenly distributed on the second magnetic column 12 and the third magnetic column 13.
[0042] By unevenly distributing the primary winding 21 and the secondary winding 22 , the primary leakage inductance and the secondary leakage inductance can be adjusted.
[0043] Optionally, the second magnetic column 12 and the third magnetic column 13 have the same length and effective cross-sectional area. The shapes of the second magnetic column 12 and the third magnetic column 13 may be the same or different. In addition, the second magnetic column 12 and the third magnetic column 13 have the same air gap G length, so the magnetic resistance formed by the second magnetic column 12 and the third magnetic column 13 is the same. Thus, the calculation formula of the relevant parameters of the magnetic integrated transformer 1 to be introduced below can be simplified.
[0044] Optionally, the fourth magnetic column 14 and the fifth magnetic column 15 have the same length and effective cross-sectional area. The shapes of the fourth magnetic column 14 and the fifth magnetic column 15 may be the same or different. In addition, the fourth magnetic column 14 and the fifth magnetic column 15 have the same air gap G length, so the magnetic resistance formed by the fourth magnetic column 14 and the fifth magnetic column 15 is the same. Thus, the calculation formula of the relevant parameters of the magnetic integrated transformer 1 to be introduced below can be simplified.
[0045] In other embodiments of the present application, the primary windings 21 wound on the second magnetic column 12 and the third magnetic column 13 are connected in series, the secondary windings 22 wound on the second magnetic column 12 and the third magnetic column 13 are connected in parallel or in series, the primary windings 21 are unevenly distributed on the second magnetic column 12 and the third magnetic column 13, and the secondary windings 22 are evenly distributed on the second magnetic column 12 and the third magnetic column 13, so that the secondary leakage inductance can be made zero.
[0046] When the secondary winding 22 is evenly distributed on the second magnetic column 12 and the third magnetic column 13, and the primary winding 21 is unevenly distributed and the number of turns on the second magnetic column 12 and the third magnetic column 13 differ greatly, the wire grooves around the magnetic column with more turns can be set larger, as long as the effective cross-sectional areas of the second magnetic column 12 and the third magnetic column 13 are equal.
[0047] The magnetic integrated transformer 1 of the present application integrates the transformer and the resonant inductor into one magnetic component, which can effectively reduce the space occupied by the transformer and the resonant inductor in the switching power supply and effectively reduce the cost.
[0048] The following will be combined Figure 6 and Figure 7 Taking the example that the primary winding 21 and the secondary winding 22 are unevenly distributed on the second magnetic column 12 and the third magnetic column 13 , the calculation method of the relevant parameters of the magnetic integrated transformer 1 of the present application is described in detail.
[0049] Figure 6 The equivalent circuit diagram of the magnetic integrated transformer 1 according to one embodiment of the present application is disclosed. Figure 6 In the figure, Np and Ns are the primary winding 21 and the secondary winding 22 of the magnetic integrated transformer 1 respectively; ip, is and im are the primary current, the secondary current and the excitation current respectively; Lm is the excitation inductance of the magnetic integrated transformer 1; Lpk and Lsk are the primary leakage inductance and the secondary leakage inductance respectively; and n is the transformation ratio of the magnetic integrated transformer 1.
[0050] Figure 7 The equivalent circuit diagram of the magnetic circuit of the magnetic integrated transformer 1 according to one embodiment of the present application is disclosed. Figure 7In the embodiment, the second magnetic column 12 and the third magnetic column 13 have the same length, the same cross-sectional area and the same air gap length, and the fourth magnetic column 14 and the fifth magnetic column 15 have the same length, the same cross-sectional area and the same air gap length. Φ1, Φ2, Φ3, Φ4 and Φ5 are the magnetic fluxes of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 respectively; Npa and Npb are the number of turns of the primary winding 21 wound on the second magnetic column 12 and the third magnetic column 13 respectively; Nsa and Nsb are the number of turns of the secondary winding 22 wound on the second magnetic column 12 and the third magnetic column 13 respectively; R1 is the magnetic resistance of the first magnetic column 11; R2 is both the magnetic resistance of the second magnetic column 12 and the third magnetic column 13; R3 is both the magnetic resistance of the fourth magnetic column 14 and the fifth magnetic column 15.
[0051] According to Ohm's law of magnetic circuit, the magnetic flux of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 can be solved, for example, as shown in the following formula:
[0052]
[0053] in,
[0054]
[0055]
[0056] Wherein, le1 is the length of the first magnetic column 11, le2 is both the length of the second magnetic column 12 and the length of the third magnetic column 13, le3 is both the length of the fourth magnetic column 14 and the length of the fifth magnetic column 15, and the lengths of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 refer to the lengths of the magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 along the magnetic field direction (such as Figure 2 Ae1 is the effective cross-sectional area of the first magnetic column 11, Ae2 is both the effective cross-sectional area of the second magnetic column 12 and the effective cross-sectional area of the third magnetic column 13, Ae3 is both the effective cross-sectional area of the fourth magnetic column 14 and the effective cross-sectional area of the fifth magnetic column 15, and the effective cross-sectional areas of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 refer to the cross-sectional areas perpendicular to the magnetic field direction; lgap1 is the air gap length of the first magnetic column 11, lgap2 is both the air gap length of the second magnetic column 12 and the air gap length of the third magnetic column 13, lgap3 is both the air gap length of the fourth magnetic column 14 and the air gap length of the fifth magnetic column 15, as shown in FIG. Figure 2 As shown; μ0 is the magnetic permeability of air; μr is the magnetic permeability of the magnetic core 10 relative to air.
[0057] Furthermore, the magnetic flux densities of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 can be solved according to the magnetic fluxes of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15, as shown in the following formula:
[0058]
[0059] Among them, B1, B2, B3, B4 and B5 are the magnetic flux densities of the first magnetic column 11, the second magnetic column 12, the third magnetic column 13, the fourth magnetic column 14 and the fifth magnetic column 15 respectively.
[0060] according to Figure 7 The equivalent circuit of the magnetic circuit shown in FIG. 1 and combined with Faraday's law of electromagnetic induction can further solve the excitation inductance, primary leakage inductance and secondary leakage inductance of the magnetic integrated transformer 1, as shown in the following formula:
[0061]
[0062]
[0063] The present application can accurately calculate the excitation inductance and primary and secondary leakage inductance parameters under different winding distributions and different air gap lengths, and can also calculate the magnetic flux density of each magnetic column under different conditions.
[0064] In addition, it can be understood that the structure of the magnetic core 10 and the calculation method thereof of the present application can also be applied to the transformer structure with a center tap on the primary / secondary side, and will not be described in detail here.
[0065] The present application also provides a switching power supply, which includes the magnetic integrated transformer 1 as described in the above embodiments.
[0066] The present application also provides an electrical appliance, which includes the switching power supply described above.
[0067] The magnetic integrated transformer, switching power supply and electrical appliance provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the magnetic integrated transformer, switching power supply and electrical appliance in the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.
Claims
1. A magnetic integrated transformer, characterized in that: It includes a magnetic core and a winding, wherein the magnetic core includes a first magnetic column, a second magnetic column, a third magnetic column, a fourth magnetic column and a fifth magnetic column, the second magnetic column and the third magnetic column are distributed on opposite sides of the first magnetic column, the fourth magnetic column and the fifth magnetic column are respectively located on the outside of the second magnetic column and the third magnetic column, and the winding is respectively wound on the second magnetic column and the third magnetic column.
2. The magnetic integrated transformer according to claim 1, characterized in that: The first magnetic column, the second magnetic column, the third magnetic column, the fourth magnetic column and the fifth magnetic column all have air gaps.
3. The magnetic integrated transformer according to claim 2, characterized in that: The winding includes a primary winding and a secondary winding, and the primary winding and the secondary winding are wound on both the second magnetic column and the third magnetic column.
4. The magnetic integrated transformer according to claim 3, characterized in that: At least one of the primary winding and the secondary winding is unevenly distributed on the second magnetic column and the third magnetic column.
5. The magnetic integrated transformer according to claim 4, characterized in that: The primary windings wound on the second magnetic column and the third magnetic column are connected in series, the secondary windings wound on the second magnetic column and the third magnetic column are connected in series, and the primary windings and the secondary windings are unevenly distributed on the second magnetic column and the third magnetic column.
6. The magnetic integrated transformer according to claim 4, characterized in that: The primary windings wound on the second magnetic column and the third magnetic column are connected in series, the secondary windings wound on the second magnetic column and the third magnetic column are connected in parallel or in series, the primary windings are unevenly distributed on the second magnetic column and the third magnetic column, and the secondary windings are evenly distributed on the second magnetic column and the third magnetic column.
7. The magnetic integrated transformer according to claim 5 or 6, characterized in that: The second magnetic column and the third magnetic column have the same length and cross-sectional area, and the second magnetic column and the third magnetic column have the same or different shapes; the fourth magnetic column and the fifth magnetic column have the same length and cross-sectional area, and the fourth magnetic column and the fifth magnetic column have the same or different shapes; the second magnetic column and the third magnetic column have the same air gap length, and the fourth magnetic column and the fifth magnetic column have the same air gap length.
8. The magnetic integrated transformer according to claim 1, characterized in that: The magnetic integrated transformer includes two magnetic cores that are symmetrically assembled.
9. The magnetic integrated transformer according to claim 2, characterized in that: A slot is provided in the middle of the first magnetic column to facilitate wiring.
10. The magnetic integrated transformer according to claim 9, characterized in that: The magnetic core is provided with openings for adding potting glue at positions corresponding to the slots.
11. A switching power supply, characterized in that: It comprises the magnetic integrated transformer as claimed in any one of claims 1 to 10.
12. An electrical appliance, characterized in that: A switching power supply comprising the switching power supply as claimed in claim 11.