Integrated planar transformer, power converter, power supply module and energy storage device

Abstract

The utility model provides an integrated planar transformer, a power converter, a power supply module and energy storage equipment. The integrated planar transformer comprises a magnetic core and a PCB winding. The magnetic core comprises an inductance magnetic column, a magnetic flux column, N transformer magnetic columns and two magnetic covers, N is a positive integer not smaller than 2, and the inductance magnetic column, the magnetic flux column and the N transformer magnetic columns are arranged between the two magnetic covers and are perpendicular to the two magnetic covers; the PCB winding comprises a first coil and a second coil; wherein first coils are wound on the N transformer magnetic columns, and the first coils on the N transformer magnetic columns are connected in series; second coils are wound on the N transformer magnetic columns and the inductance magnetic column, and the second coils on the N transformer magnetic columns are connected to the second coil on the inductance magnetic column in parallel; the magnetic flux column is arranged around the PCB winding. According to the integrated planar transformer, the transformer and the inductor can be integrally designed, the number of magnetic devices is reduced, and the integrated planar transformer has the advantages of being small in size, low in loss, high in power density, good in EMC performance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and particularly relates to an integrated planar transformer, a power converter, a power supply module and an energy storage device. BACKGROUND

[0002] At present, devices such as DC-DC converters and micro-inverters show a development trend of modularity, miniaturization, high power density and high efficiency. Magnetic devices (such as transformers and inductors) are key components in the devices, which not only need to meet performance requirements, but also need to meet requirements such as high power density, high efficiency, low loss and small size. However, the current commonly used transformer and inductor scheme has many defects such as large size, low power density and poor EMC performance, which limits the overall efficiency and power density of the device and hinders the process of modularity and miniaturization of the device. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the problems in the prior art, the present application provides an integrated planar transformer, a power converter, a power supply module and an energy storage device.

[0004] The first aspect of the present application provides an integrated planar transformer. The integrated planar transformer comprises a magnetic core and a PCB winding; the magnetic core comprises an inductor magnetic column, a magnetic flux column, N transformer magnetic columns and two magnetic covers, N is a positive integer not less than 2, the inductor magnetic column, the magnetic flux column and the N transformer magnetic columns are arranged between the two magnetic covers and perpendicular to the two magnetic covers; the PCB winding comprises a first coil and a second coil; wherein the N transformer magnetic columns are each wound with the first coil, and the first coils on the N transformer magnetic columns are connected in series; the N transformer magnetic columns and the inductor magnetic column are each wound with the second coil, and the second coils on the N transformer magnetic columns are connected in parallel to the second coil on the inductor magnetic column; the magnetic flux column is arranged around the PCB winding.

[0005] In an embodiment, the first coil and the second coil on the N transformer magnetic columns and the N transformer magnetic columns together form a transformer, wherein one of the first coil and the second coil serves as a primary coil of the transformer, and the other of the first coil and the second coil serves as a secondary coil of the transformer; the second coil on the inductor magnetic column and the inductor magnetic column together form an inductor, the inductor is connected in series with the transformer, and the second coil on the inductor magnetic column forms an inductor coil.

[0006] In an embodiment, the magnetic flux column is distributed between the inductor magnetic column and the transformer magnetic column, and between adjacent transformer magnetic columns, so as to together enclose the PCB winding, the inductor magnetic column and the transformer magnetic column with the two magnetic covers.

[0007] In an embodiment, two magnetic covers and every two adjacent magnetic flux columns jointly form a lead port; wherein the leads of the second coil on the inductor magnetic column and on each transformer magnetic column pass through different lead ports respectively, and the leads of the first coil and the leads of the second coil on each transformer magnetic column pass through the same lead port.

[0008] In an embodiment, the N transformer magnetic columns are arranged side by side, and the inductor magnetic column and the N transformer magnetic columns are arranged oppositely.

[0009] In an embodiment, at least part of the inductor magnetic column, the magnetic flux column and the N transformer magnetic columns are integrally arranged with the magnetic cover; or, at least part of the inductor magnetic column, the magnetic flux column and the N transformer magnetic columns are independently arranged and fixedly connected to the magnetic cover.

[0010] In an embodiment, the corners of the magnetic cover are chamfered.

[0011] The second aspect of the present application provides a power converter, the power converter comprising a primary side conversion circuit, a secondary side conversion circuit and the integrated planar transformer of the first aspect or any one of the embodiments of the first aspect, the primary side conversion circuit being connected to one of the first coil and the second coil, and the secondary side conversion circuit being connected to the other of the first coil and the second coil.

[0012] In an embodiment, the primary side conversion circuit is a DC-AC conversion circuit or an AC-AC conversion circuit; and the secondary side conversion circuit is a DC-AC conversion circuit or an AC-AC conversion circuit.

[0013] The third aspect of the present application provides a power supply module, the power supply module comprising the power converter of the second aspect or any one of the embodiments of the second aspect.

[0014] In an embodiment, the power supply module is a direct current-direct current conversion module or an inverter module.

[0015] The fourth aspect of the present application provides an energy storage device, the energy storage device comprising a battery and the power converter of the second aspect or any one of the embodiments of the second aspect, the battery being connected to the secondary side conversion circuit of the power converter.

[0016] Compared with the prior art, the present application has at least the following advantages:

[0017] The integrated planar transformer provided by the application is provided with a magnetic core and a PCB winding, wherein the magnetic core is provided with an inductor magnetic column, a magnetic flux column and N transformer magnetic columns, the PCB winding is a planar winding, includes a first coil and a second coil, the first coils on the N transformer magnetic columns are connected in series, and the second coils on the N transformer magnetic columns are connected in parallel with the second coil on the inductor magnetic column, so that the integrated planar transformer can be equivalent to the integration of a transformer and an inductor. Based on such a design, not only is the integrated design of the transformer and the inductor realized, the number of magnetic components is reduced, the cost is reduced, but also the height limitation of the magnetic components in the modular design is eliminated, the overall volume is reduced, the power density is effectively improved, the loss is reduced, and the modularization, miniaturization, high power density and high efficiency development of the equipment in which the integrated planar transformer is located are promoted.

[0018] Moreover, the magnetic flux column is arranged around the PCB winding and jointly surrounds the PCB winding, the inductor magnetic column and the transformer magnetic column with the two magnetic covers. Therefore, the PCB winding is mostly within the range of the magnetic core, so as to effectively shield the leakage magnetic flux and optimize the EMC performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the transformer and the inductor in series.

[0020] Figure 2 is a three-dimensional schematic diagram of the integrated planar transformer provided by the embodiment of the application.

[0021] Figure 3 is Figure 2 is an exploded schematic diagram of the integrated planar transformer shown in FIG. 1.

[0022] Figure 4 is Figure 2 is a top view of the integrated planar transformer shown in FIG. 1.

[0023] Figure 5 is Figure 2 is a side view of the integrated planar transformer shown in FIG. 1.

[0024] Figure 6 is Figure 2 is a side view of the integrated planar transformer shown in FIG. 1 from different angles.

[0025] Figure 7 is Figure 2 is a schematic diagram of the flow direction of the current on the first coil of the integrated planar transformer shown in FIG. 1.

[0026] Figure 8 is Figure 2 is a schematic diagram of the flow direction of the current on the second coil of the integrated planar transformer shown in FIG. 1.

[0027] Figure 9 is Figure 2The diagram shows the distribution of magnetic flux generated when the integrated planar transformer is energized.

[0028] Figure 10 This is a schematic diagram of a power converter provided in an embodiment of this application.

[0029] Figure 11 This is a schematic diagram of a power module provided in an embodiment of this application.

[0030] Figure 12 This is a schematic diagram of an energy storage device provided in an embodiment of this application. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application. Unless otherwise specified, the different embodiments and features described below can be combined with each other.

[0032] Currently, DC-DC converters, microinverters, and other equipment are showing a trend towards modularity, miniaturization, high power density, and high efficiency. Magnetic devices, such as... Figure 1 The transformer T and inductor Lk shown in Figures (a) and (b) are key components for energy storage and transfer in these devices. They not only need to meet performance requirements, but also requirements such as high power density, high efficiency, low loss, and small size.

[0033] The commonly used transformer and inductor solutions are as follows:

[0034] Discrete magnetic component solution: This solution uses discrete wire-wound transformers and inductors. However, this solution has a large number of magnetic components, resulting in drawbacks such as large size, low power density, and high cost.

[0035] Adjusting the winding spacing: This scheme uses the leakage inductance between the primary and secondary windings of the wound transformer as the resonant inductor. The leakage inductance is obtained by adjusting the distance between the primary and secondary windings. Although it reduces the number of magnetic components, this scheme makes it difficult to precisely control the leakage inductance value, and the obtained leakage inductance is relatively small, which cannot meet the needs of applications with large inductance requirements (or high power).

[0036] An additional leakage inductor column solution: This solution introduces an additional leakage inductor column to realize the leakage inductance function. Although the number of magnetic devices is reduced, the large inductance requirement can also be met, but the leakage inductor column is arranged inside the winding transformer, which increases the overall volume of the transformer. In addition, in a high-power application scenario, the leakage inductor column can cause the temperature of the winding inside the transformer to rise, and heat dissipation is difficult, so this solution is relatively limited in high-power applications. In addition, the leakage inductor column arranged outside the winding transformer can generate leakage magnetic flux, resulting in energy loss and interference to other devices, affecting the EMC performance.

[0037] As can be seen, the current commonly used transformer and inductor solutions have many defects, which limit the overall efficiency and power density of the device and hinder the modularization and miniaturization process of the device.

[0038] Therefore, the embodiments of the present application provide an integrated planar transformer, which can integrate the transformer and the inductor, reduce the number of magnetic devices, and has the advantages of small size, low loss, high power density, good EMC performance, etc.

[0039] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0040] Figure 2 A perspective view of an integrated planar transformer 100 provided by an embodiment of the present application is shown. Figure 3 An exploded view of the integrated planar transformer 100 provided by an embodiment of the present application is shown. Figure 4 A top view of the integrated planar transformer 100 provided by an embodiment of the present application is shown. Figure 5 And Figure 6 A side view of the integrated planar transformer 100 provided by an embodiment of the present application is shown from different viewing angles.

[0041] As Figure 2 And Figure 3 shown, the integrated planar transformer 100 includes a magnetic core 10 and a PCB winding 20.

[0042] The magnetic core 10 can be made of soft magnetic materials such as ferrite, amorphous, nanocrystalline, or silicon steel.

[0043] The magnetic core 10 includes an inductor magnetic column 11, a magnetic flux column 12, N transformer magnetic columns 13, and two magnetic covers 14, where N is a positive integer not less than 2. For convenience of description, the embodiments of the present application take N = 2 as an example for description.

[0044] The two magnetic covers 14 are arranged in parallel, the inductor magnetic column 11, the magnetic flux column 12, and the N transformer magnetic columns 13 are arranged between the two magnetic covers 14, and are perpendicular to the two magnetic covers 14.

[0045] It can be understood that the inductor magnetic column 11 can be integrally formed with one of the magnetic covers 14 as a whole or in part. Alternatively, the inductor magnetic column 11 can be independently arranged and fixedly connected to the two magnetic covers 14 by means of adhesion or the like. The magnetic flux column 12 and the transformer magnetic column 13 are the same, and thus will not be described again.

[0046] For the convenience of description, the embodiments of the present application take an example in which 1 / 2 of the inductor magnetic column 11, 1 / 2 of the magnetic flux column 12 and 1 / 2 of each transformer magnetic column 13 are integrally formed with one magnetic cover 14 as an example for description. That is, as shown in Figure 2 and Figure 3 shown, the magnetic core 10 can include a first magnetic block 15 and a second magnetic block 16, which are the same or similar (or structurally symmetrical) and each include one magnetic cover 14, 1 / 2 of the inductor magnetic column 11, 1 / 2 of the magnetic flux column 12 and 1 / 2 of each transformer magnetic column 13. The first magnetic block 15 and the second magnetic block 16 are joined together to form the magnetic core 10. In actual assembly, the PCB winding 20 can be arranged on the first magnetic block 15, and then the second magnetic block 16 is joined to the first magnetic block 15 to form the integrated planar transformer 100.

[0047] The inductor magnetic column 11, the magnetic flux column 12 and the N transformer magnetic columns 13 are arranged at intervals. It can be understood that the size, shape of the magnetic cover 14, the transformer magnetic column 13, the inductor magnetic column 11 and the magnetic flux column 12, and the interval between different magnetic columns can be set according to actual application needs, which are not limited in the present application.

[0048] In the embodiments of the present application, the corners of the magnetic cover 14 are chamfered. This design can reduce the manufacturing difficulty of the magnetic core 10, and reduce the collision of the magnetic core 10 during assembly and transportation, and improve the yield of the integrated planar transformer 100.

[0049] In the embodiments of the present application, the magnetic flux column 12 can be provided in multiple numbers and distributed between the inductor magnetic column 11 and the transformer magnetic column 13, and between two adjacent transformer magnetic columns 13.

[0050] For the convenience of description, the embodiments of the present application take an example in which the magnetic core 10 is provided with four magnetic flux columns 12 for description. Among them, as shown in Figure 3 the magnetic flux column 12 between two magnetic columns (such as the magnetic flux column 12 between the inductor magnetic column 11 and each transformer magnetic column 13, and the magnetic flux column 12 between two transformer magnetic columns 13) is at the edge position of the magnetic cover 14, and thus can be called a magnetic flux edge column. The magnetic flux column 12 between three magnetic columns (such as the magnetic flux column 12 between the inductor magnetic column 11 and two transformer magnetic columns 13) is at the middle position of the magnetic cover 14, and thus can be called a magnetic flux middle column.

[0051] The PCB winding 20 is sleeved on the transformer magnetic column 13, the inductor magnetic column 11 and the magnetic flux column 12. The PCB winding 20 can be composed of single-layer or multi-layer printed circuit boards, and each layer of the printed circuit board is provided with a coil formed by a conductive material such as copper foil. The shape and number of layers of the printed circuit board, the shape and circuit of the coil and the like can be designed according to actual application conditions.

[0052] Further, referring to Figure 7 and Figure 8 , the PCB winding 20 includes a first coil 21 and a second coil 22. As shown by the black thick line in Figure 7 , the first coil 21 is wound around the two transformer magnetic columns 13, and the first coils 21 on the two transformer magnetic columns 13 are connected in series. As shown by the black thick line in Figure 8 , the second coil 22 is wound around the two transformer magnetic columns 13 and the inductor magnetic column 11, and the second coils 22 on the two transformer magnetic columns 13 are connected in parallel to the second coil 22 on the inductor magnetic column 11. The winding direction of the first coil 21 and the second coil 22 can be selected according to actual conditions, which is not specifically limited here.

[0053] Based on such a design, the integrated planar transformer 100 can be equivalent to an inductor and a transformer connected in series.

[0054] Among them, the first coil 21 and the second coil 22 on the two transformer magnetic columns 13, and the two transformer magnetic columns 13 can jointly form a transformer T. One of the first coil 21 and the second coil 22 serves as the primary coil L1 of the transformer, and the other of the first coil 21 and the second coil 22 serves as the secondary coil L2 of the transformer.

[0055] The second coil 22 on the inductor magnetic column 11 and the inductor magnetic column 11 can jointly form an inductor Lk. The second coil 22 on the inductor magnetic column 11 serves as an inductor coil.

[0056] More specifically, when the first coil 21 serves as the primary coil and the second coil 22 serves as the secondary coil, the first coil 21 on the two transformer magnetic columns 13 forms a primary series winding of the transformer, and the second coil 22 on the two transformer magnetic columns 13 forms a secondary parallel winding of the transformer. The equivalent circuit of the integrated planar transformer 100 can be as shown in Figure 1 (a), that is, equivalent to a transformer and an inductor connected in series on the secondary side of the transformer.

[0057] When the first coil 21 serves as the secondary coil and the second coil 22 serves as the primary coil, the first coil 21 on the two transformer magnetic columns 13 forms a secondary series winding of the transformer, and the second coil 22 on the two transformer magnetic columns 13 forms a primary parallel winding of the transformer. The equivalent circuit of the integrated planar transformer 100 can be as shown in Figure 1as shown in (b) of FIG. 1, i.e. equivalent to a transformer and an inductor in series with the primary of the transformer.

[0058] In some other embodiments, the magnetic core 10 can further comprise a leakage inductor column (not shown in the figures). The leakage inductor column is arranged between the two magnetic covers 14 and serves to isolate the first coil 21 and the second coil 22, facilitating the integration of the transformer and the inductor.

[0059] Please refer to Figures 2 to 4 , the PCB winding 20 further comprises lead wires 23. Correspondingly, the magnetic core 10 is formed with lead wire ports 17 for the lead wires 23 of the first coil 21 and the second coil 22 to extend out of the magnetic core 10 to connect other components / circuits / modules / devices.

[0060] Specifically, please refer to Figure 2 , Figure 5 and Figure 6 , each adjacent pair of flux legs and the two magnetic covers 14 can jointly form a lead wire port 17, thus the magnetic core 10 can form three lead wire ports 17. Please refer to Figure 7 and Figure 8 , the lead wires 23 of the second coil 22 on the inductor leg 11 and on each transformer leg 13 respectively pass through different lead wire ports 17, and the lead wires 23 of the first coil 21 and the lead wires 23 of the second coil 22 on each transformer leg 13 pass through the same lead wire port 17.

[0061] Below, the working process of the integrated planar transformer 100 is described in its entirety, taking the first coil 21 as the primary coil and the second coil 22 as the secondary coil as an example.

[0062] When the integrated planar transformer 100 is powered on, the lead wires 23 of the first coil 21 on the transformer legs 13 are connected to an alternating current.

[0063] The flow direction of the current on the first coil 21 can be referenced, for example, to the arrows in Figure 7 . The current can flow in from the lead wires 23 of the first coil 21 on one transformer leg 13, then flow through the first coil 21, then flow to the first coil 21 on the other transformer leg 13, and finally flow out from the lead wires 23 of the first coil 21 on the other transformer leg 13.

[0064] In this process, the current on the first coil 21 generates a magnetic field around the transformer leg 13 on which the first coil 21 is located.

[0065] The first coil 21 on the transformer leg 13 and the second coil 22 on the transformer leg 13 can be coupled through the magnetic field, so that the second coil 22 on the transformer leg 13 generates a corresponding induced electromotive force and induced current. The transformer thereby realizes the transformation of voltage and current.

[0066] The flow direction of the induced current on the second coil 22 can be referred to, for example, the arrow in Figure 8 , the current can flow from the lead 23 of the second coil 22 on each transformer magnetic column 13, then flow through the second coil 22, the current on the two second coils 22 flows to the second coil 22 on the inductor magnetic column 11, and finally flows out from the lead 23 of the second coil 22 on the inductor magnetic column 11.

[0067] In this process, the current on the second coil 22 generates a magnetic field around the transformer magnetic column 13, the inductor magnetic column 11 and the second coil 22. The second coil 22 on the inductor magnetic column 11 also generates a corresponding induced electromotive force and induced current. The inductor thus stores energy.

[0068] Moreover, from the whole, the magnetic flux distribution of the magnetic core 10 can be as shown in Figure 9 .

[0069] It can be understood that in the actual circuit, there is a certain phase difference between the transformer and the inductor current. It is found in actual tests that the total magnetic flux amplitude of the transformer magnetic flux and the inductor magnetic flux vector after adding the integrated planar transformer 100 of the embodiment of the present application will be smaller than the total magnetic flux amplitude after subtracting the vector. Therefore, the current of the transformer and the current of the inductor of the embodiment of the present application are designed to be in the same direction, thereby maximizing the reduction of loss.

[0070] In addition, from Figure 9 It can also be seen that the inductor magnetic flux generated by the second coil 22 on the inductor magnetic column 11 and the transformer magnetic flux generated by the first and second coils on the transformer magnetic column 13 are in opposite directions. When these two parts of magnetic flux are transmitted to the magnetic flux column 12, they can be offset due to the opposite directions of the magnetic flux, so the loss density of the magnetic core 10 can be reduced, and the magnetic flux passing through the magnetic flux column 12 can be reduced. In the case of reducing the magnetic flux passing through the magnetic flux column 12, the loss of the overall magnetic core 10 can be reduced, and the volume of the magnetic flux column 12 can be appropriately reduced, so as to achieve the purpose of reducing the overall volume of the magnetic core 10.

[0071] In summary, the integrated planar transformer 100 of the embodiment of the present application integrates the transformer and the inductor, which can effectively reduce the number of magnetic components, reduce the cost and the overall volume, and improve the power density.

[0072] The transformer can adopt the form of primary side series connection and secondary side parallel connection (i.e. N first coils 21 are connected in series to form a primary side coil, and N second coils 22 are connected in parallel to form a secondary side coil). Based on this, on the one hand, the number of turns of the primary side coil and the number of turns of the secondary side coil on a single transformer magnetic column 13 can be reduced, which is conducive to reducing the current amplitude of the secondary side, and also can realize current sharing of the secondary side, thereby reducing the loss of the transformer and the loss of the connected devices, optimizing the heat dissipation of the magnetic component, thereby reducing the power limit of the magnetic component, realizing operation with greater power under the condition of natural cooling, and achieving high power density and high efficiency. On the other hand, the overall height of the magnetic component can be effectively controlled. Therefore, both the power and the planar design of the integrated planar transformer 100 can be improved, and the modular development of the equipment in which the integrated planar transformer 100 is located is promoted. When the transformer adopts the form of primary side parallel connection and secondary side series connection, the relevant description of the primary side series connection and the secondary side parallel connection can be referred to, and will not be described here.

[0073] Moreover, overall, the magnetic flux column 12 is arranged around the PCB winding 20, and together with the two magnetic covers 14, it surrounds the PCB winding 20, the inductor magnetic column 11 and the transformer magnetic column 13. In this way, most of the PCB winding 20 is within the range of the magnetic core 10, thereby effectively shielding the leakage magnetic flux and optimizing the EMC performance.

[0074] Among them, the N transformer magnetic columns 13 can be arranged side by side, and the inductor magnetic column 11 and the N transformer magnetic columns 13 are arranged opposite to each other. The number of turns of the first coil 21 on the N transformer magnetic columns 13 can be the same, and the number of turns of the second coil 22 on the N transformer magnetic columns 13 can be the same. In this way, space can be saved and space utilization can be improved. Moreover, the N transformer magnetic columns 13 can be more symmetrical, and the transformer and the inductor can be more symmetrical, so that the performance parameters of the two parts in series are more balanced, thereby facilitating the reduction or elimination of parasitic parameters.

[0075] Both the transformer magnetic column 13 and the inductor magnetic column 11 can be selected to have an air gap according to the actual working inductance requirement, and the effective cross-sectional area and the air gap of the magnetic column can be flexibly adjusted according to the actual inductance value (considering the resonance working condition, the inductor magnetic column 11 can have a segmented air gap), therefore, the integrated planar transformer 100 of the embodiment of the present application can adapt to the transformer primary and secondary inductance requirements and the inductance requirements in various application scenarios.

[0076] Moreover, since the inductor magnetic column 11 is separately arranged, the inductance can be adjusted without affecting the performance parameters of the transformer. Moreover, because there is no need to increase an air gap in the magnetic flux column 12, there will be no leakage magnetic flux to affect the shielding effect of EMC.

[0077] In addition, the PCB winding 20 is a planar winding, and the thickness of the winding can be much smaller than that of traditional wire windings. The required core 10 window height is small, which can effectively reduce the overall height and volume of the magnetic components, reduce the volume of the magnetic components, reduce the height of the magnetic components in high-power applications, remove the height restrictions of magnetic components in modular design, and promote the development of modular and high power density.

[0078] The PCB winding 20 has a high degree of consistency in manufacturing process and does not require the consideration of winding allowance as with wire winding. Moreover, it is easy to assemble with the magnetic core 10. Therefore, using the PCB winding 20 can also reduce the manufacturing and assembly difficulty of the integrated planar transformer 100 in this embodiment of the application, improve manufacturing efficiency, and greatly improve the consistency of parasitic parameters, which is beneficial to optimizing the EMC consistency of the circuit or equipment where the magnetic components are located.

[0079] Meanwhile, the PCB winding 20 can be designed with a higher current density. Furthermore, the primary current path includes N transformer magnetic pillars 13, and the secondary current path includes not only N transformer magnetic pillars 13 but also inductor magnetic pillars 11, enabling coupling between the transformer and inductor magnetic circuits. This reduces core loss density, decreases core size, further reduces overall magnetic component losses, and improves power density and efficiency. Moreover, the amount of copper and the magnetic core 10 can be reduced, lowering costs. It also eliminates the need for additional transition joints between the transformer and the resonant inductor, further reducing parasitic parameters and lowering costs.

[0080] In summary, based on the design of the magnetic core 10 and the windings, the size of the integrated planar transformer 100 can be reduced, the losses can be lowered, and the EMC performance can be optimized, making the integrated planar transformer 100 of this application embodiment better able to meet the design requirements of modularity, miniaturization, high power density, and high efficiency.

[0081] In addition, this application also provides a power converter 1000, which can be applied to fields such as energy storage power supply, server power supply, and vehicle power supply.

[0082] like Figure 10 As shown, the power converter 1000 includes a primary-side conversion circuit 200, a secondary-side conversion circuit 300, and an integrated planar transformer 100. The integrated planar transformer 100 can be the integrated planar transformer 100 described in the foregoing embodiments; details can be found in the relevant descriptions of the foregoing embodiments, and will not be repeated here.

[0083] In the integrated planar transformer 100, one of the first coil 21 and the second coil 22 is connected to the primary-side conversion circuit 200, and the other of the first coil 21 and the second coil 22 is connected to the secondary-side conversion circuit 300.

[0084] It is understood that the type and topology of the primary-side converter circuit 200 and the secondary-side converter circuit 300 can be designed according to the actual application, and no specific limitations are made here. For example, both the primary-side converter circuit 200 and the secondary-side converter circuit 300 can be DC-AC (direct current to alternating current) converter circuits or AC-AC (alternating current to alternating current) converter circuits. Both the primary-side converter circuit 200 and the secondary-side converter circuit 300 can adopt a bridge topology, such as a full-bridge topology or a half-bridge topology.

[0085] As a further example, when the integrated planar transformer 100 is equivalent to a transformer and an inductor connected in series with the primary side of the transformer, and both the primary-side conversion circuit 200 and the secondary-side conversion circuit 300 are DC-AC conversion circuits, the inductor can be used as a resonant inductor, and the power converter 1000 can constitute a resonant converter.

[0086] For another example, when the integrated planar transformer 100 is equivalent to a transformer and an inductor connected in series with the secondary side of the transformer, and both the primary-side conversion circuit 200 and the secondary-side conversion circuit 300 are full-bridge DC-AC conversion circuits, the inductor can be used as a resonant inductor, and the power converter 1000 can form a dual active bridge (DAB) DC-DC converter.

[0087] For another example, when the integrated planar transformer 100 is equivalent to a transformer and an inductor connected in series with the secondary side of the transformer, and the primary-side conversion circuit 200 is a full-bridge DC-AC conversion circuit, and the secondary-side conversion circuits 300 are all full-bridge or half-bridge AC-AC conversion circuits, the inductor can be used as a resonant inductor, and the power converter 1000 can form a dual active bridge DC-AC converter (also known as a dual active bridge inverter).

[0088] Furthermore, this application embodiment also provides a power module 2000.

[0089] like Figure 11 As shown, the power module 2000 includes the aforementioned power converter 1000. The power module 2000 may also include related circuits of the power converter 1000 (not shown in the figure), such as control circuits, protection circuits, pre-stage circuits or post-stage circuits, etc., which can be determined according to the actual situation and are not specifically limited here.

[0090] In one embodiment, the power module 2000 may be a DC-DC converter module, and its power converter 1000 may be, for example, an LLC resonant converter or a dual active bridge DC-DC converter, which can be used to realize the DC-DC function.

[0091] In another embodiment, the power module 2000 can be an inverter module, and the power converter 1000, for example, a dual active bridge (DAB) inverter, can be used to implement DC-AC or AC-DC functions.

[0092] In addition, the embodiments of the present application further provide a power storage device 4000.

[0093] As shown in Figure 12 The power storage device 4000 comprises the battery 3000 and the power converter 1000 connected to each other.

[0094] The power converter 1000 can be the power converter 1000 described in the foregoing embodiments, and details can be referred to the related description of the foregoing embodiments, which will not be repeated here.

[0095] The battery 3000 can be connected to the secondary side conversion circuit 300 in the power converter 1000. Based on this, the battery 3000 can be used as a load of the power converter 1000 to store the energy output by the power converter 1000. Alternatively, the battery 3000 can also be used as a power supply of the power converter 1000 to provide input to the power converter 1000.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate but not limit the technical solutions of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An integrated planar transformer, characterized by The integrated planar transformer comprises: a magnetic core comprising an inductive magnetic column, a magnetic flux column, N transformer magnetic columns, and two magnetic covers, N being a positive integer not less than 2, the inductive magnetic column, the magnetic flux column, and the N transformer magnetic columns being arranged between the two magnetic covers and being perpendicular to the two magnetic covers; a PCB winding comprising a first coil and a second coil; wherein the N transformer magnetic columns are each wound with the first coil, and the first coils on the N transformer magnetic columns are connected in series; the N transformer magnetic columns and the inductive magnetic column are each wound with the second coil, and the second coils on the N transformer magnetic columns are connected in parallel to the second coil on the inductive magnetic column; the magnetic flux column is arranged around the PCB winding.

2. The integrated planar transformer of claim 1, wherein, The first coils and the second coils on the N transformer magnetic columns, and the N transformer magnetic columns together form a transformer, wherein one of the first coil and the second coil serves as a primary coil of the transformer, and the other of the first coil and the second coil serves as a secondary coil of the transformer; the second coil on the inductive magnetic column and the inductive magnetic column together form an inductor, the inductor being connected in series with the transformer, and the second coil on the inductive magnetic column forming an inductor coil.

3. The integrated planar transformer of claim 1, wherein, The magnetic flux columns are distributed between the inductive magnetic column and the transformer magnetic columns, and between adjacent transformer magnetic columns, thereby together with the two magnetic covers enclosing the PCB winding, the inductive magnetic column, and the transformer magnetic columns.

4. The integrated planar transformer of claim 3, wherein, The two magnetic covers and every adjacent two magnetic flux columns together form a lead port; wherein the leads of the second coils on the inductive magnetic column and on each of the transformer magnetic columns respectively pass through different lead ports, and the leads of the first coils and the leads of the second coils on each of the transformer magnetic columns pass through the same lead port.

5. The integrated planar transformer of claim 1, wherein, The N transformer magnetic columns are arranged side by side, and the inductive magnetic column and the N transformer magnetic columns are oppositely arranged.

6. The integrated planar transformer of claim 1, wherein, At least part of the inductive magnetic column, the magnetic flux column, and the N transformer magnetic columns are integrally arranged with the magnetic covers; alternatively, at least part of the inductive magnetic column, the magnetic flux column, and the N transformer magnetic columns are independently arranged and fixedly connected to the magnetic covers.

7. The integrated planar transformer of claim 1, wherein, The corners of the magnetic covers are chamfered.

8. A power converter, characterized by, The power converter comprises a primary-side conversion circuit, a secondary-side conversion circuit, and the integrated planar transformer as claimed in any one of claims 1 to 7, the primary-side conversion circuit being connected to one of the first coil and the second coil, and the secondary-side conversion circuit being connected to the other of the first coil and the second coil.

9. The power converter of claim 8, wherein, The primary-side conversion circuit is a DC-AC conversion circuit or an AC-AC conversion circuit, and the secondary-side conversion circuit is a DC-AC conversion circuit or an AC-AC conversion circuit.

10. A power module, characterized by The power supply module comprises the power converter as claimed in any one of claims 8 or 9.

11. The power module of claim 10, wherein, The power supply module is a DC-DC conversion module or an inverter module.

12. An energy storage device, characterized by, The energy storage device includes a battery and the power converter as claimed in any one of claims 8 or 9, the battery being connected to the secondary side conversion circuit in the power converter.

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