Power module and multi-winding inductor

Abstract

The present application provides a high-efficiency multi-winding inductor and power module. The multi-winding inductor comprises a magnetic core and a winding assembly. The magnetic core comprises two oppositely arranged cover plates and four magnetic columns connected to the two cover plates and arranged in anticlockwise order. The winding assembly comprises first and second windings, each winding comprising first, second and third parts. The first part of the first winding is arranged between the first and second magnetic columns, the third part of the first winding is arranged between the third and fourth magnetic columns, and the first part of the second winding is arranged between the fourth and first magnetic columns. The first parts of the first and second windings extend to the first surface of the magnetic core and form the pins of the multi-winding inductor on the first surface of the magnetic core. The first and second windings are flat wires having a width and a thickness, the thickness being smaller than the width, wherein the width extends parallel to the direction of the magnetic columns.

Description

Technical Field

[0001] This invention relates to a power module and a multi-winding inductor. Background Technology

[0002] In recent years, with the development of technologies such as data centers and artificial intelligence, the operating speed of central processing units (CPUs), graphics processing units (GPUs), and various integrated circuits (ICs) has become faster and faster, and the operating current has become larger and larger. The power supply modules that power these devices, such as voltage regulator modules (VRMs), have increasingly stringent requirements in terms of power density, efficiency, and dynamic performance, posing a very high challenge to the design of VRMs.

[0003] In voltage regulation modules, multi-winding inductors often constitute the largest portion of the overall volume, and their inductance is a major factor directly affecting the efficiency and dynamic performance of the entire VRM. With the increasing power density and further miniaturization of VRMs, VRM heat dissipation design faces significant challenges, and has even become a bottleneck in VRM technology development.

[0004] like Figure 1 As shown, Figure 1 This is a schematic diagram of a VRM structure disclosed in Chinese patent application CN107046366A. Figure 1 In the VRM structure shown, the switching unit 21, which serves as a heat source, is positioned above the multi-winding inductor 10. One end of the coil 13 of the multi-winding inductor is located on the upper surface of the multi-winding inductor 10 and connected to the switching unit 21. The other end of the coil 13 is located on the lower surface of the multi-winding inductor 10 and is used to connect to the load. This arrangement allows the switching unit 21, which contains the heat source, to be directly connected to the heat sink (not shown in the figure), thereby maximizing the heat dissipation capacity of the VRM.

[0005] exist Figure 1 In the structure shown, although the inductor meets the requirement of having pins on both the top and bottom sides, it cannot achieve anti-coupling. Anti-coupling inductor technology can provide a smaller dynamic inductance to meet high dynamic performance; simultaneously, it can provide a larger steady-state inductance to achieve high efficiency. Therefore, achieving anti-coupling of the inductor with pins on both the top and bottom sides is a current design hotspot and challenge in the field of VRM power modules. Summary of the Invention

[0006] The purpose of this invention is to propose a multi-winding inductor and power module that not only has good heat dissipation but also improves efficiency.

[0007] According to one aspect of the present invention, a multi-winding inductor includes a magnetic core and a winding assembly. The magnetic core includes a first cover plate, a second cover plate, and three magnetic posts: the first cover plate and the second cover plate are disposed opposite to each other; the three magnetic posts include a first magnetic post, a second magnetic post, and a third magnetic post, arranged in a counterclockwise direction, and the two ends of each magnetic post are respectively connected to the first cover plate and the second cover plate; the winding assembly includes a first winding and a second winding; the first winding and the second winding respectively include a first part, a second part, and a third part; wherein the first part and the third part of each winding are connected through the second part; the first magnetic post is disposed between the first part of the first winding and the first part of the second winding; the second magnetic post is disposed on one side of the first part of the first winding and the third part of the second winding; the third magnetic post is disposed between the third part of the first winding and the third part of the second winding. Wherein, a first portion of the first winding extends to a first surface of the magnetic core and forms a first pin of an inductor on the first surface of the magnetic core, and a third portion extends to a second surface of the magnetic core and forms a second pin of an inductor on the second surface of the magnetic core; a first portion of the second winding extends to a first surface of the magnetic core and forms a third pin of an inductor on the first surface of the magnetic core, and a third portion extends to a second surface of the magnetic core and forms a fourth pin of an inductor on the second surface of the magnetic core, and the first and second surfaces of the magnetic core are disposed opposite to each other.

[0008] According to one embodiment of the present invention, the first winding is provided with a notch or a hole, the second winding is provided with a notch or a hole, and the first winding and the second winding are arranged to cross each other through the notch or the hole, such that the second part of the first winding overlaps with the second part of the second winding.

[0009] According to one embodiment of the present invention, the multi-winding inductor further includes a fourth magnetic post, the two ends of which are respectively connected to the first cover plate and the second cover plate; and the fourth magnetic post is disposed on one side of the third part of the first winding and the first part of the second winding.

[0010] According to one embodiment of the present invention, the first magnetic post, the first cover plate, the third magnetic post and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is less than the total magnetic reluctance of the second magnetic circuit.

[0011] According to one embodiment of the present invention, the first magnetic post, the first cover plate, the third magnetic post and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is greater than the total magnetic reluctance of the second magnetic circuit.

[0012] According to one embodiment of the present invention, the first magnetic post, the first cover plate, the third magnetic post and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is equal to the total magnetic reluctance of the second magnetic circuit.

[0013] According to one embodiment of the present invention, the sum of the air gaps in the first magnetic circuit is less than the sum of the air gaps in the second magnetic circuit.

[0014] According to one embodiment of the present invention, the magnetic permeability of at least a portion of the magnetic material on the second and fourth magnetic pillars is lower than the magnetic permeability of the magnetic material on the first and third magnetic pillars.

[0015] According to one embodiment of the present invention, the magnetic core is formed of a magnetic material, and the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the first magnetic circuit is less than the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the second magnetic circuit.

[0016] According to one embodiment of the present invention, the first winding and the second winding are flat wires having a width and a thickness, wherein the thickness is less than the width, and wherein the width is parallel to the extension direction of the magnetic post.

[0017] According to another aspect of the present invention, a multi-winding inductor includes a magnetic core and a winding assembly. The magnetic core includes a first cover plate, a second cover plate, and four magnetic pillars. The first cover plate and the second cover plate are disposed opposite to each other. The four magnetic pillars include a first magnetic pillar, a second magnetic pillar, a third magnetic pillar, and a fourth magnetic pillar, arranged in a counterclockwise direction, and each magnetic pillar is connected to the first cover plate and the second cover plate at both ends. The winding assembly includes at least a first winding and a second winding, the first winding and the second winding respectively including a first part, a second part, and a third part. The first part and the third part of each winding are connected through the second part. The first part of the first winding is disposed between the first magnetic pillar and the second magnetic pillar, the third part of the first winding is disposed between the third magnetic pillar and the fourth magnetic pillar, the first part of the second winding is disposed between the fourth magnetic pillar and the first magnetic pillar, and the third part of the second winding is disposed between the second magnetic pillar and the third magnetic pillar. Wherein, a first portion of the first winding extends to a first surface of the magnetic core and forms a first pin of an inductor on the first surface of the magnetic core; a first portion of the second winding extends to a first surface of the magnetic core and forms a third pin of an inductor on the first surface of the magnetic core, wherein the first winding and the second winding are flat wires having a width and a thickness, wherein the thickness is less than the width, and wherein the width is parallel to the extension direction of the magnetic post.

[0018] According to one embodiment of the present invention, the first winding and the second winding are arranged alternately.

[0019] According to one embodiment of the present invention, the first winding is provided with a notch or a hole, the second winding is provided with a notch or a hole, and the first winding and the second winding are arranged to cross each other through the notch or the hole, such that the second part of the first winding overlaps with the second part of the second winding.

[0020] According to one embodiment of the present invention, the third portion of the first winding extends to the second surface of the magnetic core to form a second pin of the inductor; the third portion of the second winding extends to the second surface of the magnetic core to form a fourth pin of the inductor.

[0021] According to one embodiment of the present invention, the first magnetic post, the first cover plate, the third magnetic post and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is less than or greater than or equal to the total magnetic reluctance of the second magnetic circuit.

[0022] According to one embodiment of the present invention, the sum of the air gaps in the first magnetic circuit is less than the sum of the air gaps in the second magnetic circuit.

[0023] According to one embodiment of the present invention, each of the four magnetic pillars includes a first part and a second part, and the magnetic core includes a first component and a second component, wherein the first component includes a first cover plate and the first part of the four magnetic pillars, and the second component includes a second cover plate and the second part of the four magnetic pillars, and the air gap is disposed between the first part and the second part of the four magnetic pillars.

[0024] According to one embodiment of the present invention, the magnetic core includes a first component and a second component, wherein the first component includes the four magnetic pillars and one of the first cover plate and the second cover plate, and the second component includes the other of the first cover plate and the second cover plate, and the air gap is formed between the two components.

[0025] According to one embodiment of the present invention, the second magnetic post and the fourth magnetic post are disposed on opposite sides of the first cover plate and the second cover plate, the air gap of the second magnetic post is formed between the second magnetic post and the first cover plate and the second cover plate, and the air gap of the fourth magnetic post is formed between the fourth magnetic post and the first cover plate and the second cover plate.

[0026] According to one embodiment of the present invention, the magnetic core is composed of two U-shaped components and two I-shaped components.

[0027] According to one embodiment of the present invention, the U-shaped component is composed of a ferrite material with high magnetic permeability; the I-shaped component is composed of a powder-core magnetic material with low magnetic permeability.

[0028] According to one embodiment of the present invention, the magnetic permeability of at least a portion of the magnetic material on the second and fourth magnetic pillars is lower than the magnetic permeability of the magnetic material on the first and third magnetic pillars.

[0029] According to one embodiment of the present invention, the magnetic core is formed of magnetic powder material with insulating coating, and the magnetic core and windings are integrally pressed together by a mold to form the multi-winding inductor.

[0030] According to one embodiment of the present invention, the magnetic core is formed of a magnetic material, and the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the first magnetic circuit is less than the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the second magnetic circuit.

[0031] According to another aspect of the present invention, a power module is characterized in that it includes a multi-winding inductor as described in the present invention and an integrated power module, wherein the integrated power module is stacked on a first surface of the multi-winding inductor and includes at least a first switching unit and a second switching unit. The first switching unit is electrically connected to a first pin of the multi-winding inductor, and the second switching unit is electrically connected to a third pin of the multi-winding inductor.

[0032] According to one embodiment of the present invention, the first switching unit and the second switching unit are rectangular in shape, the length direction of the first switching unit and the second switching unit are respectively consistent with the width direction of the first winding and the second winding, and the width direction of the first winding and the second winding is parallel to the extension direction of the magnetic post.

[0033] According to one embodiment of the present invention, a plurality of conductive elements are provided around the magnetic core. Each conductive element includes a first end and a second end. The first end forms a fifth pin on a first surface of the magnetic core, and the second end forms a sixth pin on a second surface of the magnetic core.

[0034] According to one embodiment of the present invention, the plurality of conductive elements includes at least two sets of power connection components and signal connection components, wherein the at least two sets of power connection components are respectively disposed on a first side and a second side of the multi-winding inductor, wherein the first side and the second side are disposed opposite to each other; the signal connection components are disposed on a third side and / or a fourth side of the multi-winding inductor.

[0035] According to one embodiment of the present invention, each group of power connection components includes an input conductor and a ground conductor; the input conductor and the ground conductor each include a first part, a second part and a third part connected in sequence; wherein the second part is disposed on the side of the multi-winding inductor, and the first part and the third part extend toward the first surface and the second surface of the multi-winding inductor, respectively.

[0036] According to one embodiment of the present invention, the input conductor and the ground conductor of each power connection component are arranged side by side.

[0037] According to one embodiment of the present invention, the input conductive element and the ground conductive element each include at least one first portion and at least one third portion; the first portions of the input conductive element and the ground conductive element of each power connection assembly are staggered; the third portions of the input conductive element and the ground conductive element of each power connection assembly are staggered; and the second portions of the input conductive element and the ground conductive element of each power connection assembly are stacked.

[0038] According to one embodiment of the present invention, the signal connection assembly includes a plurality of signal conductive elements arranged side by side.

[0039] According to one embodiment of the present invention, each power connection assembly includes at least two input conductors and at least two ground conductors. Each input conductor and each ground conductor includes a second portion and at least two first portions and at least two second portions extending from both ends of the second portion, respectively. The second portions of the at least two input conductors and the second portions of the at least two ground conductors are alternately stacked on the side surface of the multi-winding inductor. Each first portion extends toward a first surface of the multi-winding inductor, and each third portion extends toward a second surface of the multi-winding inductor. The at least two first portions of the input conductors and the at least two first portions of the adjacent ground conductors are arranged alternately. The at least two third portions of the input conductors and the at least two third portions of the adjacent ground conductors are also arranged alternately.

[0040] According to one embodiment of the present invention, a flexible substrate is included, and the plurality of conductive elements are disposed on the flexible substrate.

[0041] According to one embodiment of the present invention, the bendable substrate includes a base plate, a first side plate, a second side plate, and a third side plate extending from the base plate by bending, wherein the first side plate and the second side plate are disposed opposite to each other; wherein the plurality of conductive components include signal connection components and at least two sets of power connection components, the at least two sets of power connection components are respectively disposed on the first side plate and the second side plate, and the signal connection components are disposed on the third side plate.

[0042] According to one embodiment of the present invention, an output capacitor is included, which is disposed on the base plate and located between the second surface of the magnetic core and the base plate.

[0043] One embodiment of the present invention has the following advantages or beneficial effects:

[0044] In the multi-winding inductor of this invention, one end of the winding extends towards the first surface of the magnetic core, and pins can be formed on this first surface, allowing direct electrical connection to the integrated power module. This maximizes heat dissipation and improves the efficiency of the multi-winding inductor. Specifically, in one embodiment, the multi-winding inductor has only three magnetic pillars, each with a large equivalent magnetic circuit cross-sectional area, reducing core losses and improving efficiency. The core structure is also simpler, making manufacturing easier. In another embodiment, the winding width of the multi-winding inductor is greater than its thickness, which reduces the connection path between the pins of the multi-winding inductor and the switching node pads in the integrated power module, reducing connection impedance and further improving efficiency. Attached Figure Description

[0045] The above and other features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of the structure of a VRM in the prior art;

[0047] Figure 2 The circuit topology schematic of a two-phase VRM;

[0048] Figure 3a This is a schematic diagram of the structure of a power module according to a first embodiment of the present invention;

[0049] Figure 3b for Figure 3a The exploded view of the power module shown;

[0050] Figure 3c yes Figure 3a An exploded view of the multi-winding inductor in the power module shown.

[0051] Figure 3d yes Figure 3c The exploded view of the first and second windings in the multi-winding inductor shown;

[0052] Figure 4a and Figure 4b A schematic diagram of the pad arrangement of the first switching unit 121 in Embodiment 1 is shown;

[0053] Figure 5a for Figure 3aSchematic diagram of the winding structure of a multi-winding inductor;

[0054] Figure 5b yes Figure 5a Top view;

[0055] Figure 5c This is a schematic diagram of the winding structure of a multi-winding inductor in another embodiment;

[0056] Figure 6a It is along Figure 3b A cross-sectional view of the AA wire in a multi-winding inductor;

[0057] Figure 6b This is a top view of a multi-winding inductor;

[0058] Figure 7a This is an assembly diagram of a second embodiment of the power module of the present invention (the integrated power module is omitted);

[0059] Figure 7b yes Figure 7a Exploded view;

[0060] Figure 7c yes Figure 7a Exploded view of a multi-winding inductor;

[0061] Figure 8a This is a schematic diagram of the multi-winding inductor in Embodiment 3 of the power module of the present invention;

[0062] Figure 8b This is an exploded view of the multi-winding inductor in Embodiment 3 of the power module of the present invention;

[0063] Figure 9a This is an assembly diagram of the power module of embodiment four of the present invention (the integrated power module is omitted);

[0064] Figure 9b yes Figure 9a Exploded view;

[0065] Figure 9c yes Figure 9a Exploded view of a multi-winding inductor;

[0066] Figure 10a This is a schematic diagram of the structure of the multi-winding inductor in Embodiment 5 of the power module of the present invention;

[0067] Figure 10b yes Figure 10a A perspective view of a multi-winding inductor shown;

[0068] Figure 10c yes Figure 10b Sectional view along the BB line;

[0069] Figure 10d yes Figure 10b Top view;

[0070] Figure 10e yes Figure 10b A cross-sectional view along the CC line;

[0071] Figure 11a This is an assembly diagram of a power module according to a sixth embodiment of the present invention (the integrated power module is omitted);

[0072] Figure 11b yes Figure 11a Exploded view;

[0073] Figure 11c yes Figure 11a Exploded view of the first power connection component in the power module;

[0074] Figure 11d yes Figure 11a Exploded view of the second power connection component in the power module;

[0075] Figure 12a This is an assembly diagram of the power module of embodiment seven of the present invention (the integrated power module is omitted);

[0076] Figure 12b yes Figure 12a Exploded view;

[0077] Figure 12c yes Figure 12a Exploded view of the first power connection component in the power module;

[0078] Figure 12d yes Figure 12a Exploded view of the second power connection component in the power module;

[0079] Figure 13a This is an assembly diagram of the power module of embodiment eight of the present invention (the integrated power module is omitted);

[0080] Figure 13b It is along Figure 13a A sectional view of the DD line in the middle;

[0081] Figure 13c yes Figure 13a A schematic diagram of the structure of the flexible substrate when it is not folded.

[0082] Figure 13d yes Figure 13a A schematic diagram of the structure of the flexible substrate at another angle when it is not folded. Detailed Implementation

[0083] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0084] Example 1

[0085] like Figure 2 As shown, Figure 2 This is a circuit topology diagram of a two-phase VRM. The VRM 100 includes a first switching unit 101, a second switching unit 102, two oppositely coupled inductors 103, input connection lines 104 and 105, ground connection lines 106 and 107, input capacitors 108 and 109, and output power connection lines 110 and 111. Input connection lines 104 and 105 are connected to the input voltage V1 and to the Vin terminal of switching units 101 and 102; ground connection lines 106 and 107 are connected to the GND terminal of switching units 101 and 102; the first switching unit 101 includes two switching transistors S11 and S12, which are connected to node SW1, and node SW1 is connected to the first pin (pin1) of the anti-coupled inductor; the second switching unit 102 includes two switching transistors S21 and S22, which are connected to node SW2, and node SW2 is connected to the third pin (pin3) of the anti-coupled inductor; the first pin (pin1) and the third pin (pin3) of the anti-coupled inductor 103 are opposite pins; the second pin (pin2) and the fourth pin (pin4) of the anti-coupled inductor 103 are connected to the load directly or through output power connection lines 110 and 111 to provide the load with output voltage V2.

[0086] See Figure 3a and Figure 3b , Figure 3a This is a schematic diagram of the structure of a power module according to a first embodiment of the present invention; Figure 3b for Figure 3a The exploded view of the power module is shown. Figure 3a and Figure 3b The diagram shows a power module according to an embodiment of the present invention. The power module includes an integrated power module (IPM) 1, a multi-winding inductor 2, and multiple conductive components. The integrated power module 1 is stacked on a first surface, such as the upper surface, of the multi-winding inductor 2 and includes a printed circuit board 11, a first switching unit 121, a second switching unit 122, and a capacitor 13.

[0087] Further, see Figure 3c , Figure 3c yes Figure 3a The diagram shows an exploded view of a multi-winding inductor. The multi-winding inductor 2 of this invention includes a magnetic core 21, a first winding 221, and a second winding 222. The magnetic core 21 includes a first cover plate 211 and a second cover plate 212 disposed opposite to each other, as well as a first magnetic post 213, a second magnetic post 214, a third magnetic post 215, and a fourth magnetic post 216. The first cover plate 211 and the second cover plate 212 are respectively connected to the first magnetic post 213, the second magnetic post 214, the third magnetic post 215, and the fourth magnetic post 216.

[0088] like Figure 3c As shown, the first magnetic column 213, the second magnetic column 214, the third magnetic column 215, and the fourth magnetic column 216 are each divided into two symmetrical parts by an air gap. The first part of the first magnetic column 213, the second magnetic column 214, the third magnetic column 215, and the fourth magnetic column 216 is connected to the cover plate 211 to form a double-column E-type magnetic core. The second part of the first magnetic column 213, the second magnetic column 214, the third magnetic column 215, and the fourth magnetic column 216 is connected to the cover plate 212 to form another double-column E-type magnetic core. Therefore, the magnetic core in this embodiment is a double-column EE-type magnetic core.

[0089] Figure 3d yes Figure 3c Exploded views of the first winding 221 and the second winding 222 in the multi-winding inductor shown. Figure 3b , Figure 3c and Figure 3d As shown, the first winding 221 includes a first portion 2211, a second portion 2212, and a third portion 2213 connected in sequence. The first portion 2211 of the first winding 221 is disposed between the first magnetic post 213 and the second magnetic post 214; the second portion 2212 of the first winding 221 is disposed between the first magnetic post 213 and the third magnetic post 215; and the third portion 2213 of the first winding 221 is disposed between the third magnetic post 215 and the fourth magnetic post 216. The first portion 2211 of the first winding 221 extends toward the first surface 2100 of the magnetic core and forms the first pin 2214 of the multi-winding inductor on the first surface 2100 of the magnetic core; the third portion 2213 of the first winding 221 extends toward the second surface 2101 of the magnetic core and forms the second pin 2215 of the multi-winding inductor on the second surface 2101 of the magnetic core. The first surface 2100 may be, for example, the top surface of the magnetic core, and the second surface 2101 may be, for example, the bottom surface of the magnetic core.

[0090] The second winding 222 includes a first part 2221, a second part 2222, and a third part 2223 connected in sequence. The first part 2221 of the second winding 222 is disposed between the first magnetic post 213 and the fourth magnetic post 216; the second part 2222 of the second winding 222 is disposed between the first magnetic post 213 and the third magnetic post 215; the third part 2223 of the second winding 222 is disposed between the third magnetic post 215 and the second magnetic post 214; the first part 2221 of the second winding 222 extends toward the first surface 2100 of the magnetic core and forms the third pin 2224 of the multi-winding inductor on the first surface 2100; the third part 2223 of the second winding extends toward the second surface 2101 of the magnetic core and forms the fourth pin 2225 of the multi-winding inductor on the second surface 2101.

[0091] like Figure 3d As shown, a bayonet 2218 is provided on the first winding 221, and a bayonet 2228 is provided at the corresponding position on the second winding 222. The bayonets on the two windings are used for the two windings to be arranged in a cross-overlapping configuration. In other embodiments, holes may be provided on the first winding 221 and the second winding 222 for the two windings to be arranged in a cross-overlapping configuration. The cross-over configuration of the windings, so that the second parts of the two windings overlap, can reduce the length of the magnetic circuit generated by the current in the second part of the winding and enhance the coupling performance.

[0092] like Figure 3d As shown, both the first winding and the second winding are flat copper wire conductors with width and thickness. The width W1 of the first winding 221 is greater than its thickness T1, and similarly, the width W2 of the second winding is greater than its thickness T2. The width direction is parallel to the extension direction of the first magnetic post 213, i.e., the height direction of the magnetic core.

[0093] like Figure 3b and Figure 3d As shown, in this embodiment, the first pin 2214 and the third pin 2224 of the multi-winding inductor are disposed on the first surface 2100 of the magnetic core, for example, on the upper surface of the multi-winding inductor. The first pin 2214 is connected to the pad of the first switching unit 121 in the integrated power module (corresponding to...). Figure 2 The third pin 2224 is connected to the pad of the second switching unit 122 in the integrated power module (corresponding to the node SW1 in the module). Figure 2 The connection of node SW2 in the circuit is such that the connection path between the switching unit and the windings of the multi-winding inductor is minimized, which helps to reduce impedance and improve efficiency.

[0094] The second pin 2215 and the fourth pin 2225 of the multi-winding inductor are located on the second surface 2101 of the magnetic core, for example, on the lower surface 2101 of the multi-winding inductor. This allows them to be directly connected to the load. This arrangement minimizes the path between the output of the power module and the load, which also helps to reduce impedance and improve efficiency.

[0095] like Figure 3b , Figure 4a As shown, Figure 4a This diagram illustrates the pad arrangement of the first switching unit 121 in Embodiment 1. Both the first switching unit 121 and the second switching unit 122 in the integrated power module have rectangular structures. The width direction of the first winding 221 and the second winding 222 is consistent with the length direction of the first switching unit 121 or the second switching unit 122. It can be understood that the first pin 2214 or the third pin 2224 is also basically rectangular, and the length direction of the first pin 2214 or the third pin 2224 is consistent with the length direction of the first switching unit 121 or the second switching unit 122. Figure 4a Taking the first switching unit 121 shown as an example, the first switching unit 121 includes a first switching transistor S11 and a second switching transistor S12; the first switching transistor S11 includes an input pad 1212 (corresponding to...). Figure 2 Vin), switch node pad 1214 (corresponding to Figure 2 The second switch S12 includes switch node pad 1214 (corresponding to node SW1); Figure 2 Node SW1), grounding pad 1213 (corresponding to) Figure 2 (GND node in the context). Figure 2 It is known that the input pin Pin1 of the multi-winding inductor (e.g., the first pin 2214) must be connected to both the first switching transistor S11 and the second switching transistor S22. Therefore, the shorter the connection path and the larger the connection area, the better.

[0096] like Figure 4a The pad structure shown has a rectangular first switching unit 121, whose length direction is aligned with the width direction of the first winding 221. The width W1 of the first winding 221 is parallel to the extension direction of the magnetic post. For multi-winding inductors where the winding width is greater than the thickness, the connection path between the first pin 2214 of the multi-winding inductor and the switching node pad 1214 is the shortest, with a large overlap area and low connection impedance, thus improving efficiency. The second switching unit 122 follows the same principle.

[0097] like Figure 4bIn the pad structure shown, when the width of the multi-winding inductor is less than its thickness, the overlap area between the first pin 2214 of the multi-winding inductor and the switch node pad 1214 is small, resulting in a large connection impedance, which is not conducive to improving efficiency.

[0098] See Figure 5a , Figure 5b and Figure 5c , Figure 5a for Figure 3a Schematic diagram of the winding structure of a multi-winding inductor; Figure 5b yes Figure 5a Top view; Figure 5c This is a schematic diagram of the winding structure of a multi-winding inductor in another embodiment. Figure 5a and Figure 5c Schematic diagrams of windings with different width and thickness relationships are shown. Figure 5a The winding shown has a width W greater than its thickness T. In this case, the stacked size of the winding in the height direction H is small, so the overall height of the winding is small, which is beneficial to reduce the height of multi-winding inductors. Figure 5c As shown, when the width W is less than the thickness T, the stacked size of the windings in the height direction H is relatively large, which is not conducive to reducing the height of multi-winding inductors. Therefore, the width W of the winding is greater than the thickness T, which is beneficial to reducing the connection loss between the winding and the switching unit, and also to making multi-winding inductors thinner.

[0099] like Figure 5b and Figure 3d As shown, the width W of the first winding 221 and the second winding 222 after assembly is the same as the width W1 of one of the windings, such as the first winding 221. Therefore, the length of the magnetic circuit of the lateral part of the two windings, i.e. the first magnetic circuit, is reduced by half, which is beneficial to improving the coupling efficiency.

[0100] See Figure 6a and Figure 6b , Figure 6a It is along Figure 3b A cross-sectional view of the AA wire in a multi-winding inductor; Figure 6b This is a top view of a multi-winding inductor. When current flows into the multi-winding inductor from the first pin 2214 and the third pin 2224, and flows out from the second pin 2215 and the fourth pin 2225, the magnetic flux generated by the first winding 221 and the second winding 222 is as follows: Figure 6a and Figure 6b As shown by the dashed line.

[0101] Figure 6aThe diagram shows a first magnetic circuit formed by the first cover plate 211, the first magnetic post 213, the second cover plate 212, and the third magnetic post 215; wherein, Φ1 is the magnetic flux generated by the current in the first winding 221; Φ2 is the magnetic flux generated by the current in the second winding 222, and the magnetic fluxes Φ1 and Φ2 are opposite in direction, canceling each other out and forming anti-coupling.

[0102] Figure 6b The diagram shows the second magnetic circuit formed by the first cover plate 211, the second magnetic post 214, the second cover plate 212, and the fourth magnetic post 216 of the magnetic core; wherein, Φ3 is the magnetic flux generated by the current in the first winding 221; Φ4 is the magnetic flux generated by the current in the second winding 222, and the magnetic fluxes Φ3 and Φ4 are in the same direction, reinforce each other, and form positive coupling.

[0103] When the magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, that is, when the magnetic reluctance of the first magnetic circuit is less than that of the second magnetic circuit, the multi-winding inductor generally exhibits an anti-coupling relationship, and the first and third pins of the multi-winding inductor are opposite-named terminals; when the magnetic fluxes Φ1 and Φ2 are less than Φ3 and Φ4, that is, when the magnetic reluctance of the first magnetic circuit is greater than that of the second magnetic circuit, the multi-winding inductor generally exhibits a positive coupling relationship, and the first and third pins of the multi-winding inductor are same-named terminals; when the magnetic fluxes Φ1 and Φ2 are equal to Φ3 and Φ4, that is, when the magnetic reluctance of the first magnetic circuit is equal to that of the second magnetic circuit, the multi-winding inductor generally exhibits an uncoupled relationship.

[0104] The reluctance formula for a magnetic core is: Rm = le / (μe*Ae), where Rm is the reluctance, le is the equivalent magnetic path length, μe is the equivalent permeability, and Ae is the equivalent cross-sectional area of ​​the magnetic path. From this formula, we know that the reluctance Rm of a magnetic core is directly proportional to the equivalent magnetic path length le, inversely proportional to the equivalent permeability μe, and inversely proportional to the equivalent cross-sectional area Ae. Based on this formula, several methods can be used to achieve differences in reluctance: First, by setting and adjusting the air gap size, the equivalent permeability of the magnetic path can be adjusted to achieve differences in reluctance between different magnetic paths; second, without setting an air gap, differences in reluctance between different magnetic paths can be achieved by setting the permeability of the magnetic materials in different magnetic paths; third, without setting an air gap, and with the same magnetic material, differences in reluctance between different magnetic paths can be achieved by adjusting the ratio of the equivalent magnetic path length to the equivalent magnetic path cross-sectional area le / Ae; fourth, a combination of two or three of the above methods can be used.

[0105] To achieve anti-coupling, this embodiment employs the first method described above. The equivalent permeability of the magnetic circuit is adjusted by setting air gaps. Specifically, air gaps are set on at least one of the first magnetic pillar 213 and the third magnetic pillar 215 in the first magnetic circuit, and on at least one of the second magnetic pillar 214 and the fourth magnetic pillar 216 in the second magnetic circuit, ensuring that the total length of the air gaps in the first magnetic circuit is less than the total length of the air gaps in the second magnetic circuit. Alternatively, no air gaps are set on the first magnetic pillar 213 and the third magnetic pillar 215 in the first magnetic circuit, but only on at least one of the second magnetic pillar 214 and the fourth magnetic pillar 216 in the second magnetic circuit. This results in the magnetic reluctance in the first magnetic circuit being less than that in the second magnetic circuit. Consequently, the magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, achieving anti-coupling.

[0106] Table 1:

[0107]

[0108] Table 1 shows the different air gap sizes for the first and third magnetic pillars and the second and fourth magnetic pillars in this embodiment, resulting in anti-coupling, positive coupling, and non-coupling relationships. As shown in Table 1, when the air gaps of the first and third magnetic pillars are smaller than those of the second and fourth magnetic pillars, the magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, achieving anti-coupling; when the air gaps of the first and third magnetic pillars are larger than those of the second and fourth magnetic pillars, the magnetic fluxes Φ1 and Φ2 are less than Φ3 and Φ4, achieving positive coupling; and when the air gaps of the first and third magnetic pillars are equal to those of the second and fourth magnetic pillars, the magnetic fluxes Φ1 and Φ2 are equal to Φ3 and Φ4, achieving non-coupling. In other embodiments, materials with different permeabilities are used to achieve anti-coupling by making the magnetic reluctance in the paths of magnetic fluxes Φ1 and Φ2 less than the magnetic reluctance in the paths of Φ3 and Φ4.

[0109] Furthermore, in this first embodiment, a plurality of conductive elements are disposed around the periphery of the magnetic core 21. Each conductive element includes a first end and a second end. The first end forms a fifth pin on a first surface of the magnetic core, such as the upper surface, and the second end forms a sixth pin on a second surface of the magnetic core, such as the lower surface. The plurality of conductive elements may include, for example, signal connection components and at least two sets of power connection components. At least two sets of power connection components are respectively disposed on a first side and a second side of the multi-winding inductor, with the first and second sides facing each other. The signal connection components are disposed on a third side and / or a fourth side of the multi-winding inductor.

[0110] For example, such as Figure 3b and Figure 3cAs shown, at least two sets of power connection components include a first power connection component disposed on a first side of the magnetic core and a second power connection component disposed on a second side of the magnetic core. The first power connection component includes a first input conductor 231 and a first ground conductor 232; the second power connection component includes a second input conductor 233 and a second ground conductor 234. The first input conductor 231 and the first ground conductor 232 are disposed on the outer side of the second magnetic post 214, and the second input conductor 233 and the second ground conductor 234 are disposed on the outer side of the fourth magnetic post 216. The signal connection component includes a plurality of signal conductors 241, which are disposed on a third side of the magnetic core, such as the outer side of the second cover plate 212.

[0111] like Figure 2 The circuit topology schematic is shown. Figure 2 Input connection lines 104 and 105 correspond to respectively Figure 3c The input conductive components 231 and 233, and the grounding connection wires 106 and 107 correspond to respectively Figure 3c The grounding conductive components 232 and 234 are included. Figure 2 In the circuit topology diagram shown, the input connection line 104 and the ground connection line 106 form a loop through the first switching unit 101 and the input power supply. The existence of the loop generates parasitic inductance. If the parasitic inductance resonates with the input capacitor, it will affect the efficiency of the power supply system. To reduce the parasitic inductance in the loop, the first input conductor 231 and the first ground conductor 232 in this embodiment are arranged side by side to minimize the distance between them. The smaller the distance, the smaller the loop area, and the smaller the parasitic inductance in the loop, which is more conducive to improving efficiency. Similarly, the second input conductor 233 and the second ground conductor 234 are arranged side by side to minimize the distance between them. Each conductor can have pads formed on the first and second surfaces of the magnetic core 21, namely the fifth and sixth pins mentioned above, for integrating power connection or signal transmission between the power module 1 and the load. In other embodiments, the conductors can have different arrangement methods.

[0112] In this embodiment, the first and third pins of the multi-winding inductor are located on the first surface of the multi-winding inductor, and the second and fourth pins are located on the second surface of the multi-winding inductor. Therefore, all four sides of the multi-winding inductor can be used to install power connection components and signal connection components. In the multi-winding inductor of this invention, the configuration of the magnetic core and windings provides ample space for the installation of input connection components and signal connection components of the power module.

[0113] Example 2

[0114] See Figures 7a to 7c , Figure 7aThis is an assembly diagram of a second embodiment of the power module of the present invention (the integrated power module is omitted); Figure 7b yes Figure 7a Exploded view; Figure 7c yes Figure 7a An exploded view of the multi-winding inductor. The difference between the power module of Embodiment 2 and Embodiment 1 lies in the slightly different specific structure of the multi-winding inductor 2.

[0115] like Figure 7c As shown, a multi-winding inductor in Embodiment 2 of this power module includes a magnetic core 21 and windings. The magnetic core 21 includes a first cover plate 211 and a second cover plate 212 disposed opposite to each other, and a first magnetic post 213, a second magnetic post 214, a third magnetic post 215, and a fourth magnetic post 216 disposed between the first cover plate 211 and the second cover plate 212. In this Embodiment 2, the second cover plate 212 is separated from each magnetic post by an air gap, forming an I-shaped magnetic core portion; the first cover plate 211 is connected together with the first magnetic post 213, the second magnetic post 214, the third magnetic post 215, and the fourth magnetic post 216, forming a double-central-post E-shaped magnetic core portion; therefore, the magnetic core structure in this Embodiment 2 is a double-central-post EI type.

[0116] The windings in this second embodiment include a first winding 221 and a second winding 222, which are the same as those in the first embodiment. Figure 3d The winding structures are basically the same. The width of the winding is greater than its thickness, and the soldering area of ​​the first pin of the winding and the pad of the switching unit is large, resulting in minimal connection impedance. The first pin 2214 and the third pin 2224 of the multi-winding inductor are located on the first surface of the multi-winding inductor and are directly connected to the switching node pads of the first switching unit 121 and the second switching unit 122. This arrangement minimizes the path between the switching unit and the multi-winding inductor winding, which helps reduce impedance and improve efficiency. The second pin 2215 and the fourth pin 2225 of the multi-winding inductor are located on the second surface of the multi-winding inductor and are directly connected to the load. This arrangement also minimizes the path between the VRM output and the load, further reducing impedance and improving efficiency.

[0117] In this second embodiment, the positional relationship between the windings and the first magnetic post 213, the second magnetic post 214, the third magnetic post 215, and the fourth magnetic post 216 is basically the same as in the first embodiment. When current flows into the multi-winding inductor from the first and third pins and flows out from the second and fourth pins, the magnetic fluxes formed by the currents in the two windings in the first magnetic circuit are Φ1 and Φ2, respectively; the magnetic fluxes formed by the currents in the two windings in the second magnetic circuit are Φ3 and Φ4, respectively; the directions of magnetic fluxes Φ1 and Φ2 are opposite; the directions of magnetic fluxes Φ3 and Φ4 are the same; when magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, the multi-winding inductor as a whole achieves an anti-coupling relationship, and the first and third pins of the multi-winding inductor are opposite ends; when magnetic fluxes Φ1 and Φ2 are less than Φ3 and Φ4, the multi-winding inductor as a whole achieves a positive coupling relationship, and the first and third pins of the multi-winding inductor are same ends; when magnetic fluxes Φ1 and Φ2 are equal to Φ3 and Φ4, the multi-winding inductor achieves an uncoupled relationship. In this second embodiment, the first magnetic post 213 and the third magnetic post 215 are provided with air gaps smaller than those on the second magnetic post 214 and the fourth magnetic post 216 to achieve magnetic flux Φ1 and Φ2 path magnetic resistance is smaller than magnetic flux Φ3 and Φ4 path magnetic resistance. Therefore, magnetic flux Φ1 and Φ2 are greater than Φ3 and Φ4, thereby achieving anti-coupling.

[0118] like Figure 7b As shown, in this second embodiment, the conductive components 231, 232, 233, and 234 are respectively disposed on the side posts of the double-column E-type magnetic core, i.e., on the outer sides of the second magnetic post 214 and the fourth magnetic post 216; the first input conductive component 231, the first ground conductive component 232, the second input conductive component 233, and the second ground conductive component 234 are symmetrically disposed on the opposite sides of the multi-winding inductor; the signal conductive component 241 is disposed on the outer side of the first cover plate 211, i.e., on the outer side of the cover plate of the double-column E-type magnetic core. Each conductive component has a pad formed on the first and second surfaces of the magnetic core, respectively, for integrating the power module 1 and the load for power connection or signal transmission.

[0119] In this second embodiment, the magnetic core is configured as an E-type magnetic core with double central pillars and an I-type cover plate. The position of the air gap is moved from the middle of the magnetic core in the first embodiment to one side. Since the conductive components need to avoid the air gap when they are installed, compared to the four conductive components in the first embodiment which all need to avoid the air gap, only two conductive components 232 and 234 in this second embodiment need to avoid the air gap, which reduces the leakage flux of the air gap and the eddy current loss of the edge flux on the conductive components.

[0120] The other structures of the power module in this second embodiment, such as the integrated power module and conductive components, are basically the same as those in the first embodiment, and will not be described again here.

[0121] Example 3

[0122] Figure 8a This is a schematic diagram of the multi-winding inductor in Embodiment 3 of the power module of the present invention. Figure 8b This is an exploded view of the multi-winding inductor in Embodiment 3 of the power module of the present invention, as shown below. Figure 8a , Figure 8b As shown, a multi-winding inductor includes a magnetic core and windings. The magnetic core has only three magnetic pillars and two cover plates; its structure is similar to that of a... Figure 3c The magnetic core shown is formed by removing the fourth magnetic post 216 and part of the cover plate.

[0123] In detail, such as Figure 8b As shown, the magnetic core includes a first cover plate 211 and a second cover plate 212 disposed opposite to each other, and a first magnetic post 213, a second magnetic post 214 and a third magnetic post 215 disposed between the first cover plate 211 and the second cover plate 212 and arranged in a counterclockwise direction.

[0124] The winding assembly of the multi-winding inductor includes a first winding 221 and a second winding 222 arranged in a cross configuration, similar to Embodiment 1, which helps to reduce the volume of the multi-winding inductor. The first winding 221 and the second winding 222 each include a first part, a second part, and a third part, wherein the first part and the third part of each winding are connected through the second part. The first winding has a notch or a hole, and the second winding also has a notch or a hole. The first winding and the second winding are arranged in a cross configuration through the notch or hole, such that the second part 2212 of the first winding 221 overlaps with the second part 2222 of the second winding 222.

[0125] The first magnetic post 213 is disposed between the first part 2211 of the first winding 221 and the first part 2221 of the second winding 222; the second magnetic post 214 is disposed on one side of the first part 2211 of the first winding 221 and the third part 2223 of the second winding 222; the third magnetic post 215 is disposed between the third part 2213 of the first winding 221 and the third part 2223 of the second winding 222.

[0126] In this winding, the first portion 2211 of the first winding 221 extends to the first surface 2100 of the magnetic core to form the first pin 2214 of the inductor, and the third portion 2213 extends to the second surface 2101 of the magnetic core to form the second pin 2215 of the inductor; the first portion 2221 of the second winding 222 extends to the first surface 2100 of the magnetic core to form the third pin 2224 of the inductor, and the third portion 2223 extends to the second surface 2101 of the magnetic core to form the fourth pin 2225 of the inductor, and the first surface 2100 and the second surface 2101 of the magnetic core are arranged opposite to each other.

[0127] The current in the first winding 221 flows in from the first pin 2214 on the first surface, and the current in the second winding 222 flows in from the third pin 2224 on the first surface. When the magnetic flux in the path formed by the first cover plate 211, the first magnetic post 213, the second cover plate 212, and the third magnetic post 215 is greater than the magnetic flux in the path formed by the first cover plate 211, the first magnetic post 213, the second cover plate 212, and the second magnetic post 214, or when it is greater than the magnetic flux in the path formed by the first cover plate 211, the third magnetic post 215, the second cover plate 212, and the second magnetic post 214, the multi-winding inductor achieves an anti-coupling relationship, and the first pin 2214 and the third pin 2224 of the multi-winding inductor are opposite terminals. In this embodiment, the multi-winding inductor has only three magnetic posts, so the equivalent magnetic circuit cross-sectional area of ​​each magnetic post is larger, and the core loss is reduced; at the same time, the core structure is simpler and easier to manufacture.

[0128] The other structures of the power module in this embodiment three, such as the integrated power module and conductive components, are basically the same as those in embodiment one, and will not be described again here.

[0129] Example 4

[0130] See Figures 9a to 9c , Figure 9a This is an assembly diagram of the power module of embodiment four of the present invention (the integrated power module is omitted); Figure 9b yes Figure 9a Exploded view; Figure 9c yes Figure 9a Exploded view of a multi-winding inductor. (Example) Figure 9a and Figure 9b As shown, the difference between the power module of this embodiment four and that of embodiment one lies in the specific structure of the multi-winding inductor 2.

[0131] like Figure 9c As shown, the magnetic core of a multi-winding inductor in this embodiment includes a first cover plate 211, a second cover plate 212, a first magnetic post 213, a second magnetic post 214, a third magnetic post 215, and a fourth magnetic post 216. The first cover plate 211, the second cover plate 212, the first magnetic post 213, the second magnetic post 214, the third magnetic post 215, and the fourth magnetic post 216 are assembled together. The second magnetic post 214 and the fourth magnetic post 216 are separated by a first air gap 2140 and a second air gap 2160, respectively, forming two I-shaped magnetic core structures; the first magnetic post 213 and the third magnetic post 215 are divided into two symmetrical parts by a third air gap 2130; the first part of the first magnetic post 213 and the third magnetic post 215 is connected to the first cover plate 211, and the second part of the first magnetic post 213 and the third magnetic post 215 is connected to the second cover plate 212. The first cover plate 211, the second cover plate 212, the first magnetic column 213, and the third magnetic column 215 are divided into two symmetrical U-shaped magnetic core structures by the third air gap 2130. Therefore, the magnetic core in this embodiment is an IUUI type magnetic core.

[0132] The first winding 221 and the second winding 222 in this embodiment four are the same as those in embodiment one. Figure 3d The winding structures shown are basically the same. The width of the winding is greater than its thickness. The soldering area of ​​the winding pads, i.e., the pins of the multi-winding inductor and the switching node pads of the switching unit, is large, resulting in minimal connection impedance. The first pin 2214 and the third pin 2224 of the multi-winding inductor are located on the first surface of the multi-winding inductor and are directly connected to the pads of the first switching unit 121 and the second switching unit 122. This arrangement shortens the connection path between the switching unit and the multi-winding inductor winding, which helps to reduce impedance and improve efficiency. The second pin 2215 and the fourth pin 2225 of the multi-winding inductor are located on the second surface of the multi-winding inductor and are directly connected to the load. This arrangement also shortens the path between the output of the power system and the load, which also helps to reduce impedance and improve efficiency.

[0133] In this fourth embodiment, the positional relationship between the windings and the first magnetic post 213, the second magnetic post 214, the third magnetic post 215, and the fourth magnetic post 216 is basically the same as in the first embodiment. When current flows in from the first and third pins of the multi-winding inductor and flows out from the second and fourth pins, the magnetic fluxes formed by the currents in the two windings in the first magnetic circuit (i.e., the magnetic flux path formed by the first cover plate 211, the first magnetic post 213, the second cover plate 212, and the third magnetic post 215) are Φ1 and Φ2, respectively; the magnetic fluxes formed by the currents in the two windings in the second magnetic circuit (i.e., the magnetic flux path formed by the first cover plate 211, the second magnetic post 214, the second cover plate 212, and the fourth magnetic post 216) are Φ3, respectively. The magnetic fluxes Φ1 and Φ2 are the same in magnitude but opposite in direction; the magnetic fluxes Φ3 and Φ4 are the same in magnitude and in direction. When the magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, the multi-winding inductor achieves an anti-coupling relationship, and the first and third pins of the multi-winding inductor are opposite terminals. When the magnetic fluxes Φ1 and Φ2 are less than Φ3 and Φ4, the multi-winding inductor achieves a positive coupling relationship, and the first and third pins of the multi-winding inductor are the same terminals. When the magnetic fluxes Φ1 and Φ2 are equal to Φ3 and Φ4, the multi-winding inductor achieves a non-coupling relationship. In this fourth embodiment, to achieve anti-coupling, the air gaps on the first magnetic post 213 and the third magnetic post 215 are smaller than those on the second magnetic post 214 and the fourth magnetic post 216 to make the magnetic reluctance in the path of magnetic fluxes Φ1 and Φ2 less than the magnetic reluctance in the path of magnetic fluxes Φ3 and Φ4, so that the magnetic fluxes Φ1 and Φ2 are greater than Φ3 and Φ4, thus achieving anti-coupling.

[0134] Furthermore, in other embodiments, in Figure 9cIn the IUUI magnetic core structure shown, the UU structure magnetic core composed of the first cover plate 211, the second cover plate 212, the first magnetic pillar 213, and the third magnetic pillar 215 is made of a high-permeability magnetic material, such as ferrite; the type II magnetic core structure formed by the second magnetic pillar 214 and the fourth magnetic pillar 216 is made of a low-permeability magnetic material, such as powder core material; when the magnetic circuits of magnetic fluxes Φ1 and Φ2 have the same ratio of magnetic circuit length to equivalent cross-sectional area as the magnetic circuits of Φ3 and Φ4... The UU-shaped magnetic core has high permeability and low magnetic reluctance, resulting in large magnetic fluxes Φ1 and Φ2. The two I-shaped magnetic cores have low permeability and high magnetic reluctance, resulting in small magnetic fluxes Φ3 and Φ4. This allows the requirement that Φ1 and Φ2 are greater than Φ3 and Φ4. The UU-shaped magnetic core uses magnetic materials with high permeability, which can improve the coupling of the anti-coupled multi-winding inductor. The two I-shaped magnetic cores use magnetic materials with low permeability, which can improve the saturation current capability of the anti-coupled multi-winding inductor.

[0135] like Figure 9b As shown, in this fourth embodiment, conductive elements 231, 232, 233, and 234 are respectively disposed on the outer sides of the second magnetic post 214 and the fourth magnetic post 216. The first input conductive element 231, the first ground conductive element 232, the second input conductive element 233, and the second ground conductive element 234 are symmetrically disposed on opposite sides of the multi-winding inductor; the signal conductive element 241 is disposed on the side of the second cover plate 212. Each of the input conductive element, the ground conductive element, and the signal conductive element can form a pad on the first surface and the second surface for integrating power connections or signal transmission between the power module and the inductor, and between the load and the inductor. This embodiment sets the magnetic core in an IUUI structure, where each conductive element can completely avoid the air gap, reducing the loss of magnetic flux at the edge of the air gap on the conductive element; at the same time, the width of the conductive element can be wider to reduce the DC impedance of the conductive element; the IUUI magnetic core structure is also simpler in terms of mold making.

[0136] Example 5

[0137] Figure 10a This is a schematic diagram of another multi-winding inductor structure according to the present invention; Figure 10b yes Figure 10a A perspective view of a multi-winding inductor; Figure 10c yes Figure 10b Sectional view along the BB line; Figure 10d yes Figure 10b Top view; Figure 10e yes Figure 10b A sectional view along the CC line. (e.g.) Figures 10a to 10eAs shown, another type of multi-winding inductor in this embodiment has a core made of a low-permeability magnetic material with an insulating coating, such as powder-core magnetic material. This inductor is integrally formed by pressing the windings and magnetic material together, and there is no air gap in the core. This multi-winding inductor achieves anti-coupling by setting different equivalent cross-sections and equivalent magnetic circuit lengths of the magnetic pillars.

[0138] like Figures 10a to 10e As shown, the magnetic core is a single, integrally formed structure. The core is divided into a first cover plate 211, a second cover plate 212, a first magnetic post 213, a second magnetic post 214, a third magnetic post 215, and a fourth magnetic post 216 via windings. When current flows into the multi-winding inductor from the first and third pins and out from the second and fourth pins, the magnetic fluxes formed by the currents in the two windings in the first magnetic circuit (i.e., the magnetic flux path formed through the first cover plate 211, the first magnetic post 213, the second cover plate 212, and the third magnetic post 215) are Φ1 and Φ2, respectively; the magnetic fluxes formed in the second magnetic circuit (the magnetic flux path formed through the first cover plate 211, the second magnetic post 214, the second cover plate 212, and the fourth magnetic post 216) are Φ3 and Φ4, respectively. 4; The equivalent magnetic circuit cross-sectional area of ​​the first magnetic circuit is 23S1, and the equivalent magnetic circuit length is 24L1; the equivalent magnetic circuit cross-sectional area of ​​the second magnetic circuit is 23S2, and the equivalent magnetic circuit length is 24L2; In a multi-winding inductor, the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the magnetic flux in the first magnetic circuit (24L1 / 23S1) is set to be less than the ratio of the equivalent magnetic circuit length to the equivalent cross-sectional area of ​​the magnetic flux in the second magnetic circuit (24L2 / 23S2) to achieve magnetic flux Φ1, Φ2 greater than magnetic flux Φ3, Φ4 to achieve anti-coupling.

[0139] Structurally, the difference in the ratio of magnetic circuit length to equivalent cross-sectional area is achieved by setting different lengths of the second part of the winding. For example, when the length of the second part of the winding increases, the area of ​​23S1 increases, the area of ​​23S2 decreases, the magnetic circuit length 24L1 remains unchanged, and 24L2 increases. Therefore, the ratio of the equivalent magnetic circuit length to the equivalent cross-sectional area of ​​the magnetic flux in the first magnetic circuit, 24L1 / 23S1, is less than the ratio of the equivalent magnetic circuit length to the equivalent cross-sectional area of ​​the magnetic flux in the second magnetic circuit, 24L2 / 23S2, so as to achieve anti-coupling.

[0140] Example 6

[0141] See Figures 11a to 11d , Figure 11a This is an assembly diagram of a power module according to a sixth embodiment of the present invention (the integrated power module is omitted); Figure 11b yes Figure 11a Exploded view; Figure 11c yes Figure 11a Exploded view of the first power connection component in the power module; Figure 11d yes Figure 11a An exploded view of the second power connection component in the power module. (See diagram below.) Figure 11aand Figure 11b As shown, the difference between the power module of Embodiment Six and Embodiment One lies in the specific structure of the conductive components.

[0142] The power module includes at least two sets of power connection components among its multiple conductive parts. Figure 11a Two sets are shown: a first power connection assembly and a second power connection assembly located on opposite sides of the magnetic core. The first power connection assembly includes a first input conductor 231 and a first ground conductor 232; the second power connection assembly includes a second input conductor 233 and a second ground conductor 234.

[0143] like Figure 11b and Figure 11c As shown, in this sixth embodiment, the first input conductive element 231 and the first ground conductive element 232 are at least partially overlapped, and the second input conductive element 233 and the second ground conductive element 234 are at least partially overlapped.

[0144] Specifically, the first input conductive element 231 includes a first part 2311, a second part 2312, and a third part 2313; the first ground conductive element 232 includes a first part 2321, a second part 2322, and a third part 2323. The first part 2311 of the first input conductive element 231 is located on the upper left side of the second part 2312, and the first part 2321 of the first ground conductive element 232 is located on the upper right side of the second part 2322. The first parts 2311 and 2321 of the first input conductive element 231 and the first part 2321 of the first ground conductive element 232 respectively form pins on the first surface of the magnetic core for connecting to the integrated power module. The third part 2313 of the first input conductive element 231 is located on the lower right side of the second part 2312, and the third part 2323 of the first ground conductive element 232 is located on the lower left side of the second part 2322. The third parts 2313 of the first input conductive element 231 and the third part 2323 of the first ground conductive element 232 respectively form pins on the second surface for connecting to the customer main unit. The second part 2312 of the first input conductive element 231 overlaps with the second part 2322 of the first ground conductive element 232. These two parts are insulated from each other and have a short interval. Therefore, the loop area between this section of input conductive elements is small, resulting in a small parasitic inductance. The first part 2311 of the first input conductive element 231 and the first part 2321 of the first ground conductive element 232 are staggered, and the third part 2313 of the first input conductive element 231 and the third part 2323 of the first ground conductive element 232 are staggered. This staggered arrangement causes the magnetic flux in the loop formed by the first parts 2311 and 2321 on the first surface to cancel out the magnetic flux in the loop formed by the third parts 2313 and 2323 on the second surface, thereby further reducing the parasitic inductance of the entire loop.

[0145] like Figure 11d As shown, the second power connection assembly includes a second input conductor 233 and a second ground conductor 234. The structure of the second input conductor 233 and the second ground conductor 234 is similar to... Figure 11c The conductive elements 231 and 232 shown have basically the same structure. Specifically, the second input conductive element 233 includes a first part 2331, a second part 2332, and a third part 2333; the second ground conductive element 234 includes a first part 2341, a second part 2342, and a third part 2343. The second parts 2332 and 2342 of the conductive elements 233 and 234 overlap, with only the thickness of the insulating layer between these two parts. Therefore, the loop area between the conductive elements is small, resulting in a small parasitic inductance. The first part 2331 and the third part 2333 of the second input conductive element 233 and the first part 2341 and the third part 2343 of the second ground conductive element 234 are respectively staggered on the first surface and the second surface. This staggered arrangement causes the magnetic flux in the loop formed by the first part 2331 and 2341 on the first surface to cancel out the magnetic flux in the loop formed by the third part 2333 and 2343 on the second surface, thereby further reducing the parasitic inductance of the entire loop.

[0146] This embodiment reduces parasitic inductance in the conductive loop by overlapping the second part of the conductive element and alternating the first and third parts of the conductive element, thereby improving efficiency.

[0147] Example 7

[0148] See Figures 12a to 12d , Figure 12a This is an assembly diagram of the power module of embodiment seven of the present invention (the integrated power module is omitted); Figure 12b yes Figure 12a Exploded view; Figure 12c yes Figure 12a Exploded view of the first power connection component in the power module; Figure 12d yes Figure 12a An exploded view of the second power connection component in the power module. (See diagram below.) Figure 12a and Figure 12b As shown, the difference between the power module of Embodiment Seven and Embodiment One lies in the specific structure of the conductive components.

[0149] like Figure 12b and Figure 12cAs shown, this embodiment seven includes a first power connection assembly and a second power connection assembly disposed on two opposite sides of the magnetic core. The first power connection assembly includes a first input conductor 231a, a second input conductor 231b, a first ground conductor 232a, and a second ground conductor 232b. The first input conductor 231a and the second input conductor 231b each include a first portion 2311, a second portion 2312, a third portion 2313, a fourth portion 2314, and a fifth portion 2315; the first ground conductor 232a and the second ground conductor 232b each include a first portion 2321, a second portion 2322, a third portion 2323, a fourth portion 2324, and a fifth portion 2325.

[0150] The first input conductive element 231a, the first ground conductive element 232a, the second input conductive element 231b, and the second ground conductive element 232b are arranged alternately. The first portions 2311 and 2312 of the first input conductive element 231a and the second input conductive element 231b are alternately arranged with the first portions 2321 and 2322 of the first ground conductive element 232a and the second ground conductive element 232b, forming pins on the first surface of the magnetic core. The fourth portions 2314 and 2315 of the first input conductive element 231a and the second input conductive element 231b are alternately arranged with the fourth portions 2324 and 2325 of the first ground conductive element 232a and the second ground conductive element 232b, forming pins on the second surface of the magnetic core. The third portion 2313 of the first input conductor 231a, the third portion 2323 of the first ground conductor 232a, the third portion 2313 of the second input conductor 231b, and the third portion 2323 of the second ground conductor 232b are arranged in an alternating overlapping manner. Since the current directions in the input conductors and the ground conductors are opposite, the alternating arrangement of the input conductors and the ground conductors helps to reduce parasitic inductance. This alternating arrangement of multiple conductors can usually be easily achieved through printed circuit board (PCB) technology.

[0151] like Figure 12d As shown, the second power connection component includes a third input conductor 233a, a fourth input conductor 233b, a third ground conductor 234a, and a fourth ground conductor 234b. The arrangement of the third input conductor 233a, the fourth input conductor 233b, the third ground conductor 234a, and the fourth ground conductor 234b is similar to... Figure 12a The first input conductive element 231a, the second input conductive element 231b, the first ground conductive element 232a, and the second ground conductive element 232b shown are configured in basically the same way, and will not be described again here.

[0152] Example 8

[0153] See Figures 13a to 13d , Figure 13a This is an assembly diagram of the power module of embodiment eight of the present invention (the integrated power module is omitted); Figure 13b It is along Figure 13a A sectional view of the DD line in the middle; Figure 13c yes Figure 13a A schematic diagram of the structure of the flexible substrate when it is not folded. Figure 13d yes Figure 13a A schematic diagram of the structure of the flexible substrate at another angle when it is not folded.

[0154] like Figure 13a and Figure 13b As shown, the multi-winding inductor structure in the power module of Embodiment 8 is basically the same as that of Embodiment 1, including a magnetic core and windings. The magnetic core includes a first cover plate 211 and a second cover plate 212 disposed opposite to each other, and a first magnetic post 213, a second magnetic post 214, a third magnetic post 215, and a fourth magnetic post 216 connected to the first cover plate 211 and the second cover plate 212. The windings include a first winding 221 and a second winding 222 disposed crosswise. The first winding 221 forms a first pin 2214 on the first surface of the magnetic core and a second pin 2215 on the second surface of the magnetic core; the second winding 222 forms a third pin 2224 on the first surface of the magnetic core and a fourth pin 2225 on the second surface of the magnetic core.

[0155] The difference between the power module of Embodiment 8 and Embodiment 1 is that it also includes a bendable substrate, and conductive components are disposed on the bendable substrate.

[0156] like Figure 13b and Figure 13c As shown, the bendable substrate includes a base plate 51, a first side plate 52, a second side plate 53, and a third side plate 54 that extend from the side of the base plate 51 by bending. The first side plate 52 and the second side plate 53 are disposed opposite to each other. The first side plate 52 can be attached to the outer side of the fourth magnetic post 216 of the magnetic core, the second side plate 53 can be attached to the outer side of the second magnetic post 214 of the magnetic core, and the third side plate 54 can be attached to the outer side of the second cover plate 212 or the first cover plate 211 of the magnetic core. The upper ends of the first side plate 52 and the second side plate 53 extend toward the first surface 2100 of the magnetic core, respectively, forming a first extension portion 520 and a second extension portion 530.

[0157] like Figure 13b As shown, the base plate 51 of the bendable substrate is provided with a second pin 2215 and a fourth pin 2225. The lower end of the first winding 221 can be connected to the base plate 51 of the bendable substrate, and then connected to the second pin 2215 through the internal wiring of the bendable substrate 51; the lower end of the second winding 222 can be connected to the base plate 51 of the bendable substrate, and then connected to the fourth pin 2225 through the internal wiring of the bendable substrate 51.

[0158] In this embodiment eight, the signal conductor 241 in the power module can be directly mounted on the third side plate 54; the first power connection assembly, including the first input conductor 231 and the first ground conductor 232, can be directly mounted on the first side plate 52; and the second power connection assembly, including the second input conductor 233 and the second ground conductor 234, can be directly mounted on the second side plate 53. An output capacitor 60 can also be mounted on the base plate 51. The output capacitor 60 is located between the base plate 51 and the magnetic core.

[0159] compared to Figure 12a The combined conductive component structure shown in this embodiment allows for the simultaneous pre-forming of input conductive components, ground conductive components, and signal conductive components on a bendable substrate. This enables the conductive components to achieve higher precision, including dimensional and relative positional accuracy. This is primarily because the bendable substrate is fabricated using PCB or flexible PCB processes, which can achieve high dimensional and relative positional accuracy.

[0160] like Figure 13b As shown, in this embodiment, the output capacitor is placed between the lower surface of the multi-winding inductor and the bendable substrate, which reduces the number of output capacitors on the user's motherboard, thereby saving space occupied by the output capacitors on the user's motherboard; at the same time, it shortens the distance between the power module output and the load, thereby reducing the transmission loss between the power module and the load, and improving the power supply efficiency of the power module.

[0161] Optionally, a portion of the input capacitor can be placed between the lower surface of the multi-winding inductor and the flexible substrate. Compared to placing the input capacitor on the integrated power module, integrating the input capacitor onto the multi-winding inductor increases the number of input capacitors, reduces resonance between the input capacitor and parasitic inductance, thereby reducing losses and improving efficiency.

[0162] A capacitor can be placed between the upper surface of a multi-winding inductor and the flexible substrate in a manner similar to that between the lower surface of a multi-winding inductor and the flexible substrate.

[0163] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0164] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0165] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0166] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application claims.

Claims

1. A multi-winding inductor, characterized in that, include: The magnetic core includes a first cover plate, a second cover plate, and four magnetic pillars. The first cover plate and the second cover plate are arranged opposite to each other. The four magnetic pillars include a first magnetic pillar, a second magnetic pillar, a third magnetic pillar, and a fourth magnetic pillar, arranged in a counterclockwise direction. The two ends of each magnetic pillar are respectively connected to the first cover plate and the second cover plate. and A winding assembly includes at least a first winding and a second winding, wherein the first winding and the second winding respectively include a first part, a second part and a third part, wherein the first part and the third part of each winding are connected through the second part; The first portion of the first winding is disposed between the first magnetic post and the second magnetic post. The third portion of the first winding is disposed between the third magnetic post and the fourth magnetic post. The first portion of the second winding is disposed between the fourth magnetic post and the first magnetic post. The third part of the second winding is disposed between the second magnetic post and the third magnetic post. Wherein, a first portion of the first winding extends to a first surface of the magnetic core and forms a first pin of the multi-winding inductor on the first surface of the magnetic core; a first portion of the second winding extends to a first surface of the magnetic core and forms a third pin of the multi-winding inductor on the first surface of the magnetic core. Wherein, the first winding and the second winding are flat wires with width and thickness, the thickness being less than the width, wherein the width is parallel to the extension direction of the magnetic post; The first winding and the second winding are arranged in an alternating manner, and the second part of the first winding overlaps with the second part of the second winding.

2. The multi-winding inductor as described in claim 1, characterized in that, The first winding has a notch or a hole, and the second winding has a notch or a hole. The first winding and the second winding are arranged to cross each other through the notch or the hole, so that the second part of the first winding overlaps with the second part of the second winding.

3. The multi-winding inductor as described in claim 1, characterized in that, The third portion of the first winding extends to the second surface of the magnetic core to form the second pin of the inductor; The third portion of the second winding extends to the second surface of the magnetic core to form the fourth pin of the inductor.

4. The multi-winding inductor as described in claim 1, characterized in that, The first magnetic post, the first cover plate, the third magnetic post, and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate, and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is less than the total magnetic reluctance of the second magnetic circuit.

5. The multi-winding inductor as described in claim 1, characterized in that, The first magnetic post, the first cover plate, the third magnetic post, and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate, and the fourth magnetic post form a second magnetic circuit; the total magnetic reluctance of the first magnetic circuit is greater than the total magnetic reluctance of the second magnetic circuit.

6. The multi-winding inductor as described in claim 1, characterized in that, The first magnetic post, the first cover plate, the third magnetic post, and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate, and the fourth magnetic post form a second magnetic circuit; the total magnetic resistance of the first magnetic circuit is equal to the total magnetic resistance of the second magnetic circuit.

7. The multi-winding inductor as described in claim 4, characterized in that, The sum of the air gaps in the first magnetic circuit is less than the sum of the air gaps in the second magnetic circuit.

8. The multi-winding inductor as described in claim 7, characterized in that, Each of the four magnetic pillars includes a first part and a second part. The magnetic core includes a first component and a second component. The first component includes a first cover plate and the first part of the four magnetic pillars. The second component includes a second cover plate and the second part of the four magnetic pillars. The air gap is disposed between the first part and the second part of the four magnetic pillars.

9. The multi-winding inductor as described in claim 7, characterized in that, The magnetic core includes a first component and a second component, wherein the first component includes the four magnetic pillars and one of the first cover plate and the second cover plate, and the second component includes the other of the first cover plate and the second cover plate, and the air gap is formed between the two components.

10. The multi-winding inductor as described in claim 7, characterized in that, The second magnetic post and the fourth magnetic post are disposed on opposite sides of the first cover plate and the second cover plate. The air gap of the second magnetic post is formed between the second magnetic post and the first cover plate and the second cover plate, and the air gap of the fourth magnetic post is formed between the fourth magnetic post and the first cover plate and the second cover plate.

11. The multi-winding inductor as described in claim 10, characterized in that, The magnetic core consists of two U-shaped components and two I-shaped components.

12. The multi-winding inductor as described in claim 11, characterized in that, The U-shaped component is composed of a ferrite material with high magnetic permeability; the I-shaped component is composed of a powder-core magnetic material with low magnetic permeability.

13. The multi-winding inductor as described in claim 4, characterized in that, The magnetic permeability of at least a portion of the magnetic material on the second and fourth magnetic pillars is lower than that of the magnetic material on the first and third magnetic pillars.

14. The multi-winding inductor as described in claim 1, characterized in that, The magnetic core is formed from magnetic powder material with an insulating coating, and the magnetic core and windings are integrally pressed together by a mold to form the multi-winding inductor.

15. The multi-winding inductor as described in claim 14, characterized in that, The first magnetic post, the first cover plate, the third magnetic post, and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic post, the second cover plate, and the fourth magnetic post form a second magnetic circuit; the magnetic core is formed of a magnetic material, and the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the first magnetic circuit is less than the ratio of the equivalent magnetic circuit length to the equivalent cross-section of the second magnetic circuit.

16. A power supply module, characterized in that, include: The multi-winding inductor as described in any one of claims 1-15; and An integrated power module is stacked on the first surface of the multi-winding inductor and includes at least a first switching unit and a second switching unit. The first switching unit is electrically connected to the first pin of the multi-winding inductor, and the second switching unit is electrically connected to the third pin of the multi-winding inductor.

17. The power module as described in claim 16, characterized in that, The first switch unit and the second switch unit are rectangular in shape. The length direction of the first switch unit and the second switch unit are consistent with the width direction of the first winding and the second winding, respectively. The width direction of the first winding and the second winding is parallel to the extension direction of the magnetic column.

18. The power module as described in claim 16, characterized in that, It also includes multiple conductive elements disposed around the magnetic core. Each conductive element includes a first end and a second end. The first end forms a fifth pin on the first surface of the magnetic core, and the second end forms a sixth pin on the second surface of the magnetic core.

19. The power module as described in claim 18, characterized in that, The plurality of conductive components include: At least two sets of power connection components are respectively disposed on a first side and a second side of the multi-winding inductor, wherein the first side and the second side are disposed opposite to each other; and A signal connection component is disposed on the third and / or fourth side of the multi-winding inductor.

20. The power module as described in claim 19, characterized in that, Each of the power connection components includes an input conductor and a ground conductor; the input conductor and the ground conductor each include a first part, a second part and a third part connected in sequence; wherein the second part is disposed on the side of the multi-winding inductor, and the first part and the third part extend toward the first surface and the second surface of the multi-winding inductor, respectively.

21. The power module as described in claim 20, characterized in that, The input conductor and ground conductor of each group of power connection components are arranged side by side.

22. The power module as described in claim 20, characterized in that, The input conductive element and the ground conductive element each include at least one first part and at least one third part; The first portions of the input conductor and the ground conductor of each group of power connection components are staggered. The third portions of the input conductor and the ground conductor of each group of power connection components are staggered; the second portions of the input conductor and the ground conductor of each group of power connection components are stacked.

23. The power module as described in claim 21, characterized in that, The signal connection assembly includes multiple signal conductive elements, which are arranged side by side.

24. The power module as described in claim 19, characterized in that, Each power connection assembly includes at least two input conductors and at least two ground conductors; Each of the input conductors and each of the ground conductors each includes a second portion and at least two first portions and at least two third portions extending from both ends of the second portion, respectively; In this configuration, the second portions of at least two input conductive elements and the second portions of at least two ground conductive elements are alternately stacked on the side of the multi-winding inductor, each of the first portions extends toward the first surface of the multi-winding inductor, and each of the third portions extends toward the second surface of the multi-winding inductor. The input conductive element has at least two first portions and the adjacent ground conductive element has at least two first portions arranged alternately. The input conductive element has at least two third portions and the adjacent ground conductive element has at least two third portions arranged alternately.

25. The power module as described in claim 18, characterized in that, Also includes: A bendable substrate, wherein the plurality of conductive elements are disposed on the bendable substrate.

26. The power module as described in claim 25, characterized in that, The bendable substrate includes a base plate, a first side plate extending from the base plate by bending, a second side plate, and a third side plate, wherein the first side plate and the second side plate are disposed opposite to each other. The plurality of conductive components include a signal connection assembly and at least two sets of power connection assemblies, the at least two sets of power connection assemblies being respectively disposed on the first side plate and the second side plate, and the signal connection assembly being disposed on the third side plate.

27. The power module as described in claim 26, characterized in that, It also includes an output capacitor, which is disposed on the base plate and located between the second surface of the magnetic core and the base plate.

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