Power modules and multi-winding inductors

Abstract

The present invention provides a multi-winding inductor and power module with high efficiency. The multi-winding inductor includes a magnetic core and a winding assembly. The magnetic core includes two oppositely arranged cover plates and three magnetic columns connected to the two cover plates and arranged in sequence in a counterclockwise direction. The winding assembly includes a first and a second winding arranged crosswise, and each winding includes a first, a second and a third part. The first magnetic column is arranged between the first part of the first winding and the first part of the second winding; the second magnetic column is arranged on one side of the first part of the first winding and the third part of the second winding; the third magnetic column is arranged between the third part of the first winding and the third part of the second winding. The first parts of the first and second windings extend to the first surface of the magnetic core and form the first and third pins of the inductor; the third parts of the first and second windings extend to the second surface of the magnetic core and form the second and fourth pins of the inductor. The first surface and the second surface of the magnetic core are arranged opposite to each other.

Description

Technical Field

[0001] The invention relates to a power supply module and a multi-winding inductor. Background Art

[0002] In recent years, with the development of technologies such as data centers and artificial intelligence, the operating speeds of central processing units (CPUs), graphics processing units (GPUs) and various integrated chips (ICs) have become faster and faster, and the operating currents have become larger and larger. The power modules that power these devices, such as voltage regulation modules (VRMs), have become more and more demanding in terms of power density, efficiency, dynamic performance, etc., posing very high challenges to the design of VRMs.

[0003] In the voltage regulation module, the volume of the multi-winding inductor often accounts for the largest proportion, and the inductance of the multi-winding inductor is also the main factor that directly affects the efficiency and dynamic performance of the entire VRM. With the increase of VRM power density and the further reduction of volume, VRM heat dissipation design faces huge challenges and has even become a bottleneck in the development of VRM technology.

[0004] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a VRM disclosed in Chinese patent application CN107046366A. Figure 1 In the VRM structure shown, the switch unit 219 as a heat source is arranged above the multi-winding inductor 10, one end of the coil 13 of the multi-winding inductor is arranged on the upper surface of the multi-winding inductor 10 and connected to the switch unit 219, and the other end of the coil 13 of the multi-winding inductor is arranged on the lower surface of the multi-winding inductor 10 for connecting to the load. Such an arrangement enables the switch unit 219 containing the heat source to be directly connected to the upper 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 PIN output on both the upper and lower sides, the inductor cannot achieve reverse coupling. The reverse coupling inductor technology can provide a smaller dynamic inductance to meet high dynamic performance; at the same time, the reverse coupling inductor can provide a larger steady-state inductance to achieve high efficiency. Therefore, realizing reverse coupling on the basis of PIN output on both the upper and lower sides of the inductor is a current design hotspot and difficulty in the field of VRM module power modules. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-winding inductor and a power module which not only have good heat dissipation effect but also are conducive to improving 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 columns: the first cover plate and the second cover plate are arranged opposite to each other; the three magnetic columns include a first magnetic column, a second magnetic column and a third magnetic column, which are arranged in sequence in a counterclockwise direction, and the two ends of each magnetic column 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 column is arranged between the first part of the first winding and the first part of the second winding; the second magnetic column is arranged on one side of the first part of the first winding and the third part of the second winding; the third magnetic column is arranged between the third part of the first winding and the third part of the second winding. Among them, the first part of the first winding extends to the first surface of the magnetic core and forms a first pin of the inductor on the first surface of the magnetic core, and the third part extends to the second surface of the magnetic core and forms a second pin of the inductor on the second surface of the magnetic core; the first part of the second winding extends to the first surface of the magnetic core and forms a third pin of the inductor on the first surface of the magnetic core, and the third part extends to the second surface of the magnetic core and forms a fourth pin of the inductor on the second surface of the magnetic core, and the first surface and the second surface of the magnetic core are arranged 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 cross-arranged through the notch or the hole, so 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 also includes a fourth magnetic column, the two ends of which are respectively connected to the first cover plate and the second cover plate; and the fourth magnetic column is arranged 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 column, the first cover plate, the third magnetic column and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic column, the second cover plate and the fourth magnetic column form a second magnetic circuit; the total magnetic resistance of the first magnetic circuit is less than the total magnetic resistance of the second magnetic circuit.

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

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

[0013] According to an embodiment of the present invention, the sum of the air gaps on the first magnetic circuit is smaller than the sum of the air gaps on the second magnetic circuit.

[0014] According to an embodiment of the present invention, the magnetic permeability of at least part of the magnetic material on the second magnetic column and the fourth magnetic column is lower than the magnetic permeability of the magnetic material on the first magnetic column and the third magnetic column.

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

[0016] According to an embodiment of the present invention, the first winding and the second winding are a flat wire having a width and a thickness, the thickness is smaller than the width, and the width is parallel to the extension direction of the magnetic column.

[0017] According to another aspect of the present invention, a multi-winding inductor includes a magnetic core and a winding assembly, wherein the magnetic core includes a first cover plate, a second cover plate and four magnetic columns; the first cover plate and the second cover plate are arranged opposite to each other; the four magnetic columns include a first magnetic column, a second magnetic column, a third magnetic column and a fourth magnetic column, which are arranged in sequence in a counterclockwise direction, and the two ends of each magnetic column are respectively connected to the first cover plate and the second cover plate; the 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. The first part and the third part of each winding are connected through the second part. The first part of the first winding is arranged between the first magnetic column and the second magnetic column, the third part of the first winding is arranged between the third magnetic column and the fourth magnetic column, the first part of the second winding is arranged between the fourth magnetic column and the first magnetic column, and the third part of the second winding is arranged between the second magnetic column and the third magnetic column. Among them, the first part of the first winding extends to the first surface of the magnetic core and forms a first pin of the inductor on the first surface of the magnetic core; the first part of the second winding extends to the first surface of the magnetic core and forms a third pin of the inductor on the first surface of the magnetic core, wherein the first winding and the second winding are a flat wire with width and thickness, the thickness is smaller than the width, and the width is parallel to the extension direction of the magnetic column.

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

[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, the first winding and the second winding are cross-arranged through the notch or the hole, so 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 column, the first cover plate, the third magnetic column and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic column, the second cover plate and the fourth magnetic column form a second magnetic circuit; the total magnetic resistance of the first magnetic circuit is less than or greater than or equal to the total magnetic resistance of the second magnetic circuit.

[0022] According to an embodiment of the present invention, the sum of the air gaps on the first magnetic circuit is smaller than the sum of the air gaps on the second magnetic circuit.

[0023] According to one embodiment of the present invention, the four magnetic pillars each include 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 parts of the four magnetic pillars, and the second component includes a second cover plate and the second parts of the four magnetic pillars, and the air gap is arranged 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 columns and one of the first cover plate and the second cover plate, 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 column and the fourth magnetic column are arranged on opposite sides of the first cover plate and the second cover plate, the air gap of the second magnetic column is formed between the second magnetic column and the first cover plate and the second cover plate, and the air gap of the fourth magnetic column is formed between the fourth magnetic column 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; and the I-shaped component is composed of a powder core magnetic material with low magnetic permeability.

[0028] According to an embodiment of the present invention, the magnetic permeability of at least part of the magnetic material on the second magnetic column and the fourth magnetic column is lower than the magnetic permeability of the magnetic material on the first magnetic column and the third magnetic column.

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

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

[0031] According to another aspect of the present invention, a power module is characterized by comprising the multi-winding inductor and an integrated power module according to the present invention, wherein the integrated power module is stacked on the first surface of the multi-winding inductor and comprises at least a first switch unit and a second switch unit. The first switch unit is electrically connected to the first pin of the multi-winding inductor, and the second switch unit is electrically connected to the third pin of the multi-winding inductor.

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

[0033] According to one embodiment of the present invention, it includes a plurality of conductive members, which are arranged around the magnetic core. The conductive members include 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.

[0034] According to one embodiment of the present invention, the multiple conductive members include at least two groups of power connection components and signal connection components, wherein the at least two groups of power connection components are respectively arranged on the first side and the second side of the multi-winding inductor, wherein the first side and the second side are arranged opposite to each other; the signal connection component is arranged on the third side and / or the fourth side of the multi-winding inductor.

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

[0036] According to an embodiment of the present invention, the input conductive member and the ground conductive member of each group of power connection components are arranged side by side.

[0037] According to one embodiment of the present invention, the input conductive member and the grounding conductive member respectively include at least one first part, and respectively include at least one third part; the first parts of the input conductive member and the grounding conductive member of each group of power connection components are staggered; the third parts of the input conductive member and the grounding conductive member of each group of power connection components are staggered; the second parts of the input conductive member and the grounding conductive member of each group of power connection components are stacked.

[0038] According to an embodiment of the present invention, the signal connection assembly includes a plurality of signal conductive members, and the signal conductive members are arranged side by side.

[0039] According to one embodiment of the present invention, each group of power connection components includes at least two input conductive members and at least two grounding conductive members, each of the input conductive members and each of the grounding conductive members respectively includes a second portion and at least two first portions and at least two second portions respectively extending from two ends of the second portion, wherein the second portions of the at least two input conductive members and the second portions of the at least two grounding conductive members are alternately stacked on the side surfaces of the multi-winding inductor, each of the first portions respectively extends toward the first surface of the multi-winding inductor, and each of the third portions respectively extends toward the second surface of the multi-winding inductor; the at least two first portions of the input conductive members and the at least two first portions of the grounding conductive members adjacent thereto are arranged alternately; and the at least two third portions of the input conductive members and the at least two third portions of the grounding conductive members adjacent thereto are arranged alternately.

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

[0041] According to one embodiment of the present invention, the bendable substrate includes a bottom plate, a first side plate, a second side plate and a third side plate bent and extended from the bottom plate, wherein the first side plate and the second side plate are arranged opposite to each other; wherein the multiple conductive parts include a signal connection component and at least two groups of power connection components, the at least two groups of power connection components are respectively arranged on the first side plate and the second side plate, and the signal connection component is arranged on the third side plate.

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

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

[0044] In the multi-winding inductor of the present invention, one end of the winding extends to the first surface of the magnetic core, and pins can be formed on the first surface respectively, so that it can be directly electrically connected to the integrated power module, which is beneficial to improving the efficiency of the multi-winding inductor on the basis of maximizing the heat dissipation effect. In detail, in one embodiment, the multi-winding inductor has only three magnetic columns, each of which has a large equivalent magnetic circuit cross-sectional area, and the core loss is reduced, which is beneficial to improving the efficiency of the multi-winding inductor. At the same time, the magnetic core structure is simple and the manufacturing is simpler; in another embodiment, the winding width of the multi-winding inductor is greater than the thickness, which is beneficial to reducing the connection path between the pins of the multi-winding inductor and the switch node pads in the integrated power module, reducing the connection impedance, and thus helping to improve the efficiency of the multi-winding inductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

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

[0047] Figure 2 It is the circuit topology schematic diagram of 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 An exploded view of the power module is shown;

[0050] Figure 3c yes Figure 3a An exploded diagram of a multi-winding inductor in a power module is shown;

[0051] Figure 3d yes Figure 3c An exploded diagram of a first winding and a second winding in a multi-winding inductor shown;

[0052] Figure 4a and Figure 4b A schematic diagram showing the arrangement of pads of the first switch unit 121 in the first embodiment is shown;

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

[0054] Figure 5b yes Figure 5a A top view of

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

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

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

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

[0059] Figure 7b yes Figure 7a Exploded diagram of

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

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

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

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

[0064] Figure 9b yes Figure 9a Exploded diagram of

[0065] Fig.9c yes Figure 9a Exploded diagram of a multi-winding inductor;

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

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

[0068] Fig.10c yes Fig.10b Sectional view along line BB;

[0069] Fig.10d yes Fig.10b A top view of

[0070] Fig.10e yes Fig.10b Sectional view along line CC;

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

[0072] Fig.11b yes Fig.11a Exploded diagram of

[0073] Fig.11c yes Fig.11a An exploded diagram of a first power connection component in a power module;

[0074] Fig.11d yes Fig.11a An exploded view of a second power connection component in a power module;

[0075] Fig.12a This is an assembly diagram of Embodiment 7 of the power module of the present invention (the integrated power module is omitted);

[0076] Figure 12b yes Fig.12a Exploded diagram of

[0077] Fig.12c yes Fig.12a An exploded diagram of a first power connection component in a power module;

[0078] Fig.12d yes Fig.12a An exploded view of a second power connection component in a power module;

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

[0080] Fig.13b is along Fig.13a A cross-sectional view of the DD line in FIG.

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

[0082] Fig.13d yes Fig.13a Schematic diagram of the structure at another angle when the bendable substrate is not folded. DETAILED DESCRIPTION

[0083] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0084] Embodiment 1

[0085] like Figure 2 As shown, Figure 2 The circuit topology schematic diagram of the two-phase VRM is shown in FIG. The VRM 100 comprises a first switch unit 101 , a second switch unit 102 , two reverse coupled inductors 103 , input connection lines 104 , 105 , ground connection lines 106 , 107 , input capacitors 108 , 109 and output power connection lines 110 , 111 . Among them, the input connection lines 104 and 105 are connected to the input voltage V1 and are connected to the Vin terminals of the switch units 101 and 102; the ground connection lines 106 and 107 are connected to the GND terminals of the switch units 101 and 102; the first switch unit 101 includes two switch tubes S11 and S12, the two switch tubes S11 and S12 are connected to the node SW1, and the node SW1 is connected to the first pin of the anti-coupling inductor, that is, the input pin (pin1); the second switch unit 102 includes two switch tubes S21 and S22, the two switch tubes S21 and S22 are connected to the node SW2, and the node SW2 is connected to the third pin (pin3) of the anti-coupling inductor; the first pin (pin1) and the third pin (pin3) of the anti-coupling inductor 103 are opposite-name terminals; the second pin (pin2) and the fourth pin (pin4) of the anti-coupling inductor 103 are connected to the load directly or through the output power connection lines 110 and 111 to provide the output voltage V2 for the load.

[0086] See also 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 An exploded view of the power module is shown. Figure 3a and Figure 3b The power module of the first embodiment of the present invention is shown, and the power module includes an integrated power module (IPM) 1, a multi-winding inductor 2, and a plurality of conductive parts. The integrated power module 1 is stacked on a first surface, such as an upper surface, of the multi-winding inductor 2, and includes a printed circuit board 11, a first switch unit 121, a second switch unit 122, and a capacitor 13.

[0087] For further information, see Figure 3c , Figure 3c yes Figure 3a The exploded view of the multi-winding inductor shown in FIG. The multi-winding inductor 2 of the present invention comprises a magnetic core 21, a first winding 221, and a second winding 222. The magnetic core 21 comprises a first cover plate 211 and a second cover plate 212 arranged opposite to each other, and a first magnetic column 213, a second magnetic column 214, a third magnetic column 215, and a fourth magnetic column 216. The first cover plate 211 and the second cover plate 212 are connected to the first magnetic column 213, the second magnetic column 214, the third magnetic column 215, and the fourth magnetic column 216, respectively.

[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 parts of the first magnetic column 213, the second magnetic column 214, the third magnetic column 215 and the fourth magnetic column 216 are connected to the cover plate 211 to form an E-type magnetic core with two center columns; the second parts of the first magnetic column 213, the second magnetic column 214, the third magnetic column 215 and the fourth magnetic column 216 are connected to the cover plate 212 to form another E-type magnetic core with two center columns. Therefore, the magnetic core in this embodiment 1 is an EE-type magnetic core with two center columns.

[0089] Figure 3d yes Figure 3c FIG. 2 is an exploded view of a first winding 221 and a second winding 222 in a multi-winding inductor. 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 arranged between the first magnetic column 213 and the second magnetic column 214; the second portion 2212 of the first winding 221 is arranged between the first magnetic column 213 and the third magnetic column 215; the third portion 2213 of the first winding 221 is arranged between the third magnetic column 215 and the fourth magnetic column 216. The first portion 2211 of the first winding 221 extends toward the first surface 2100 of the magnetic core and forms a 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 a 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 portion 2221, a second portion 2222, and a third portion 2223 connected in sequence. The first portion 2221 of the second winding 222 is disposed between the first magnetic column 213 and the fourth magnetic column 216; the second portion 2222 of the second winding 222 is disposed between the first magnetic column 213 and the third magnetic column 215; the third portion 2223 of the second winding 222 is disposed between the third magnetic column 215 and the second magnetic column 214; the first portion 2221 of the second winding 222 extends toward the first surface 2100 of the magnetic core and forms a third pin 2224 of the multi-winding inductor on the first surface 2100; the third portion 2223 of the second winding extends toward the second surface 2101 of the magnetic core and forms a 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 a corresponding position of the second winding 222. The bayonet on the two windings is used for the two windings to be cross-arranged and overlapped for assembly. In other embodiments, holes may be provided on the first winding 221 and the second winding 222 for the two windings to be cross-arranged and overlapped for assembly. The windings are cross-arranged so that the second parts of the two windings overlap, which 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, the first winding and the second winding are both copper flat wire conductors with width and thickness, the width W1 of the first winding 221 is greater than the thickness T1, and similarly, the width W2 of the second winding is greater than the thickness T2. The width direction is parallel to the extension direction of the first magnetic column 213, that is, the height direction of the magnetic core.

[0093] like Figure 3b and Figure 3d As shown, in the first embodiment, the first pin 2214 and the third pin 2224 of the multi-winding inductor are arranged on the first surface 2100 of the magnetic core, for example, on the upper surface of the multi-winding inductor, and the first pin 2214 is connected to the pad (corresponding to the pad) of the first switch unit 121 in the integrated power module. Figure 2 The third pin 2224 is connected to the pad (corresponding to the node SW1 in the integrated power module) of the second switch unit 122. Figure 2 Such an arrangement makes the connection path between the switch unit and the winding of the multi-winding inductor as short as possible, which is beneficial to reducing impedance and improving efficiency.

[0094] The second pin 2215 of the multi-winding inductor and the fourth pin 2225 of the multi-winding inductor are set on the second surface 2101 of the magnetic core, for example, on the lower surface 2101 of the multi-winding inductor, and can be used to directly connect to the load. This setting makes the path between the output of the power module and the load the shortest, which is also beneficial to reduce impedance and improve efficiency.

[0095] like Figure 3b , Figure 4a As shown, Figure 4a The schematic diagram of the arrangement of the pads of the first switch unit 121 in the first embodiment is shown. The first switch unit 121 and the second switch unit 122 in the integrated power module are both rectangular structures, and the width direction of the first winding 221 and the second winding 222 is consistent with the length direction of the first switch unit 121 or the second switch 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 switch unit 121 or the second switch unit 122. Figure 4a As an example, the first switch unit 121 shown in the figure comprises a first switch tube S11 and a second switch tube S12; the first switch tube S11 comprises an input pad 1212 (corresponding to Figure 2 Vin in), switch node pad 1214 (corresponding to Figure 2 The second switch tube S12 includes a switch node pad 1214 (corresponding to the node SW1 in FIG. Figure 2 Node SW1 in the ground pad 1213 (corresponding to Figure 2 Node GND in the Figure 2 It can be seen that the input pin Pin1 (eg, the first pin 2214 ) of the multi-winding inductor should be connected to both the first switch tube S11 and the second switch tube S22 , so the connection path should be as short as possible and the connection area should be as large as possible.

[0096] like Figure 4a In the pad structure shown, the first switch unit 121 is rectangular, and the length direction of the first switch unit 121 is consistent with the width direction of the first winding 221, wherein the width W1 of the first winding 221 is parallel to the extension direction of the magnetic column; for the case where the width of the multi-winding inductor is greater than the thickness, the connection path between the first pin 2214 of the multi-winding inductor and the switch node pad 1214 is the shortest, and the overlapping area is large, and the connection impedance is small, which is conducive to improving efficiency. The second switch unit 122 is the same.

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

[0098] See also Figure 5a , Figure 5b and Figure 5c , Figure 5a for Figure 3a Schematic diagram of the winding structure of the multi-winding inductor; Figure 5b yes Figure 5a A top view of Figure 5c FIG. 4 is a schematic diagram of a winding structure of a multi-winding inductor in another embodiment. Figure 5a and Figure 5c The schematic diagrams of the structures of windings with different width and thickness relationships are shown respectively. Figure 5a In the winding shown, the width W of the winding is greater than the thickness T. At this time, the stacked size of the winding in the height direction H is small, so the height of the entire winding is small, which is conducive to reducing the height of the multi-winding inductor; Figure 5c When the width W of the winding shown is smaller than the thickness T, the size of the winding stacked in the height direction H is large, which is not conducive to reducing the height of the multi-winding inductor. 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 switch unit on the one hand, and is also beneficial to the thinning of the multi-winding inductor on the other hand.

[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, for example, the first winding 221 . Therefore, the length of the magnetic circuit of the lateral part of the two windings, i.e., the length of the first magnetic circuit, is reduced by half, which is beneficial to improving the coupling efficiency.

[0100] See also Figure 6a and Figure 6b , Figure 6a is along Figure 3b A cross-sectional view of line AA in a multi-winding inductor; Figure 6b 2 is a top view of the multi-winding inductor. When current flows into the first pin 2214 and the third pin 2224 of the multi-winding inductor and flows out of 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 shown in FIG. Figure 6a and Figure 6b Shown by the dashed line.

[0101] Figure 6aThe first magnetic circuit formed by the first cover plate 211, the first magnetic column 213, the second cover plate 212 and the third magnetic column 215 is shown; 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 directions of the magnetic flux Φ1 and the magnetic flux Φ2 are opposite, and they cancel each other out to form anti-coupling.

[0102] Figure 6b The second magnetic circuit formed by the first cover plate 211, the second magnetic column 214, the second cover plate 212 and the fourth magnetic column 216 of the magnetic core is shown; 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 flux Φ3 and the magnetic flux Φ4 have the same direction and reinforce each other to form positive coupling.

[0103] When the magnetic flux Φ1, Φ2 is greater than Φ3, Φ4, that is, the magnetic resistance of the first magnetic circuit is smaller than that of the second magnetic circuit, the multi-winding inductor generally presents an anti-coupling relationship, and the first pin and the third pin of the multi-winding inductor are opposite-name terminals; when the magnetic flux Φ1, Φ2 is less than Φ3, Φ4, that is, the magnetic resistance of the first magnetic circuit is greater than that of the second magnetic circuit, the multi-winding inductor generally presents a positive coupling relationship; the first pin and the third pin of the multi-winding inductor are like-name terminals; when the magnetic flux Φ1, Φ2 is equal to Φ3, Φ4, that is, the magnetic resistance of the first magnetic circuit is equal to the magnetic resistance of the second magnetic circuit, the multi-winding inductor generally presents an uncoupled relationship.

[0104] Refer to the magnetic core reluctance formula: Rm = le / (μe*Ae), where Rm is the reluctance, le is the equivalent magnetic circuit length, μe is the equivalent magnetic permeability, and Ae is the equivalent cross-sectional area of ​​the magnetic circuit. From the reluctance formula, it can be known that the reluctance Rm of the magnetic core is proportional to the equivalent magnetic circuit length le of the magnetic circuit, inversely proportional to the equivalent magnetic permeability μe of the magnetic core, and inversely proportional to the equivalent magnetic circuit cross-sectional area Ae of the magnetic core. According to the reluctance formula, there are several ways to achieve the difference in reluctance: First, by setting and adjusting the air gap size, adjusting the equivalent magnetic permeability of the magnetic circuit to achieve the difference in reluctance of different magnetic circuits; second, without setting the air gap, by setting the magnetic permeability of the magnetic material of different magnetic circuits to achieve the difference in reluctance of different magnetic circuits; third, without setting the air gap, under the condition of the same magnetic material, by adjusting the ratio of the equivalent magnetic circuit length to the equivalent magnetic circuit cross-sectional area le / Ae to achieve the difference in reluctance of different magnetic circuits; fourth, a combination of two or three of the above-mentioned first, second, and third methods.

[0105] In order to achieve anti-coupling, this embodiment 1 adopts the first method mentioned above, and adjusts the equivalent magnetic permeability of the magnetic circuit by setting an air gap, that is, an air gap is set on at least one of the first magnetic column 213 and the third magnetic column 215 of the first magnetic circuit, and an air gap is set on at least one of the second magnetic column 214 and the fourth magnetic column 216 of the second magnetic circuit, and the total length of the air gap in the first magnetic circuit is smaller than the total length of the air gap in the second magnetic circuit; or the first magnetic column 213 and the third magnetic column 215 of the first magnetic circuit are not set with an air gap, and an air gap is only set on at least one of the second magnetic column 214 and the fourth magnetic column 216 of the second magnetic circuit, so that the magnetic resistance in the first magnetic circuit is smaller than the magnetic resistance in the second magnetic circuit, so that the magnetic flux Φ1, Φ2 is greater than Φ3, Φ4, and anti-coupling is achieved.

[0106] Table 1:

[0107]

[0108] Table 1 shows that in the first embodiment, the air gap sizes of the first magnetic column and the third magnetic column and the air gap sizes of the second magnetic column and the fourth magnetic column are different, and the coupling relationships of reverse coupling, forward coupling and non-coupling can be obtained respectively. As shown in Table 1, when the air gap of the first magnetic column and the third magnetic column is smaller than the air gap of the second magnetic column and the fourth magnetic column, the magnetic flux Φ1, Φ2 is larger than Φ3, Φ4, and the reverse coupling relationship is achieved; when the air gap of the first magnetic column and the third magnetic column is larger than the air gap of the second magnetic column and the fourth magnetic column, the magnetic flux Φ1, Φ2 is smaller than Φ3, Φ4, and the positive coupling relationship is achieved; when the air gap of the first magnetic column and the third magnetic column is equal to the air gap of the second magnetic column and the fourth magnetic column, the magnetic flux Φ1, Φ2 is equal to Φ3, Φ4, and the non-coupling relationship is achieved. In other embodiments, materials with different magnetic permeabilities are used to achieve the purpose of reverse coupling by making the magnetic resistance in the path of the magnetic flux Φ1, Φ2 smaller than the magnetic resistance in the path of Φ3, Φ4.

[0109] Further, in the first embodiment, a plurality of conductive members are arranged around the magnetic core 21, and the conductive members include a first end and a second end, the first end forms a fifth pin on a first surface of the magnetic core, such as an upper surface, and the second end forms a sixth pin on a second surface of the magnetic core, such as a lower surface. The plurality of conductive members include, for example, a signal connection component and at least two groups of power connection components. The at least two groups of power connection components are respectively arranged on a first side surface and a second side surface of the multi-winding inductor, and the first side surface and the second side surface are arranged opposite to each other; the signal connection component is arranged on a third side surface and / or a fourth side surface of the multi-winding inductor.

[0110] For example, if Figure 3b and Figure 3cAs shown, at least two groups of power connection components include a first power connection component arranged on the first side of the magnetic core and a second power connection component arranged on the 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 arranged on the outside of the second magnetic column 214, and the second input conductor 233 and the second ground conductor 234 are arranged on the outside of the fourth magnetic column 216. The signal connection component includes a plurality of signal conductors 241, and the signal conductors 241 are arranged on the third side of the magnetic core, for example, on the outside of the second cover plate 212.

[0111] like Figure 2 The circuit topology schematic diagram is shown in the figure. Figure 2 The input connection lines 104 and 105 correspond to Figure 3c The input conductive members 231, 233 and the ground connection wires 106, 107 correspond to Figure 3c The grounding conductive members 232, 234 in the embodiment of the present invention are provided. Figure 2 In the circuit topology schematic diagram shown, the input connection line 104 and the ground connection line 106 form a loop through the first switch unit 101 and the input power supply. The existence of the loop will generate loop parasitic inductance. If the loop parasitic inductance resonates with the input capacitor, it will affect the efficiency of the power supply system. In order to reduce the parasitic inductance in the loop, the first input conductive member 231 and the first ground conductive member 232 in the first embodiment are arranged side by side, and the spacing between the first input conductive member 231 and the first ground conductive member 232 is minimized. The smaller the spacing, the smaller the area of ​​the loop, and the smaller the parasitic inductance in the loop, which is more conducive to improving efficiency. Similarly, the second input conductive member 233 and the second ground conductive member 234 are arranged side by side to minimize the spacing between the two. Each conductive member can form a pad on the first surface and the second surface of the magnetic core 21, that is, the fifth pin and the sixth pin mentioned above, which are used for power connection or signal transmission between the integrated power module 1 and the load. In other embodiments, each conductive member can have different settings.

[0112] In the first embodiment, the first pin and the third pin of the multi-winding inductor are arranged on the first surface of the multi-winding inductor, and the second pin and the fourth pin are arranged on the second surface of the multi-winding inductor, so that the four sides of the multi-winding inductor can be used to arrange the power connection component and the signal connection component. In the multi-winding inductor of the present invention, the arrangement of the magnetic core and the winding provides sufficient space for the arrangement of the input connection component and the signal connection component of the power module.

[0113] Embodiment 2

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

[0115] like Figure 7c As shown, a multi-winding inductor in the second embodiment of the power module includes a magnetic core 21 and a winding. The magnetic core 21 includes a first cover plate 211 and a second cover plate 212 that are arranged opposite to each other, and a first magnetic column 213, a second magnetic column 214, a third magnetic column 215 and a fourth magnetic column 216 that are arranged between the first cover plate 211 and the second cover plate 212. In this second embodiment, the second cover plate 212 is separated from each magnetic column by an air gap to form an I-shaped magnetic core part; the first cover plate 211 is connected with the first magnetic column 213, the second magnetic column 214, the third magnetic column 215 and the fourth magnetic column 216 to form a double-center-column E-shaped structure magnetic core part; therefore, the magnetic core structure in this second embodiment is a double-center-column EI-shaped structure.

[0116] The windings in the second embodiment include a first winding 221 and a second winding 222, which are similar to those in the first embodiment. Figure 3d The winding structures are basically the same. The width of the winding is greater than the thickness, the first pin of the winding and the pad welding area of ​​the switch unit are large, and the connection impedance is minimized. The first pin 2214 of the multi-winding inductor and the third pin 2224 of the multi-winding inductor are arranged on the first surface of the multi-winding inductor, and are directly connected to the switch node pad of the first switch unit 121 and the switch node pad of the second switch unit 122. This arrangement makes the connection path between the switch unit and the multi-winding inductor winding shortest, which is conducive to reducing impedance and improving efficiency. The second pin 2215 of the multi-winding inductor and the fourth pin 2225 of the multi-winding inductor are arranged on the second surface of the multi-winding inductor, and are directly connected to the load. This arrangement makes the path between the output of the VRM and the load shortest, which is also conducive to reducing impedance and improving efficiency.

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

[0118] like Figure 7b As shown, each conductive member 231, 232, 233, 234 in the second embodiment is respectively arranged on the side column of the double-middle-column E-type magnetic core, that is, on the outside of the second magnetic column 214 and the fourth magnetic column 216; the first input conductive member 231, the first grounding conductive member 232 and the second input conductive member 233, the second grounding conductive member 234 are symmetrically arranged on the opposite sides of the multi-winding inductor; the signal conductive member 241 is arranged on the outer side of the first cover plate 211, that is, on the outside of the cover plate of the double-middle-column E-type magnetic core. Each conductive member forms a pad on the first surface and the second surface of the magnetic core, respectively, for power connection or signal transmission between the integrated power module 1 and the load.

[0119] In the second embodiment, the magnetic core is arranged into an E-type magnetic core with double center columns and an I-type cover plate structure, and the position of the air gap is moved to one side from the middle position of the magnetic core in the first embodiment, because the conductive parts need to avoid the air gap when being arranged. Compared with the four conductive parts in the first embodiment, all of them need to avoid the air gap. In the second embodiment, only two conductive parts 232 and 234 need to avoid the air gap, thereby reducing the eddy current loss of the leakage magnetic flux of the air gap and the edge magnetic flux on the conductive parts.

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

[0121] Embodiment 3

[0122] Figure 8a is a schematic diagram of a multi-winding inductor in a third embodiment of a power module of the present invention, Figure 8b FIG. 1 is an exploded diagram of a multi-winding inductor in the third embodiment of the power module of the present invention. Figure 8a , Figure 8b As shown in Figure 1, the multi-winding inductor includes a magnetic core and windings. The magnetic core has only three magnetic columns and two cover plates. The magnetic core structure is similar to Figure 3c The magnetic core shown is formed by removing the fourth magnetic column 216 and a portion of the cover plate.

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

[0124] The winding assembly of the multi-winding inductor includes a first winding 221 and a second winding 222 which are cross-arranged, which is the same as the first embodiment, and is conducive to reducing the volume of the multi-winding inductor. The first winding 221 and the second winding 222 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 winding is provided with a notch or a hole, and the second winding is provided with a notch or a hole. The first winding and the second winding are cross-arranged through the notch or the hole, so 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 column 213 is arranged between the first part 2211 of the first winding 221 and the first part 2221 of the second winding 222; the second magnetic column 214 is arranged 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 column 215 is arranged between the third part 2213 of the first winding 221 and the third part 2223 of the second winding 222.

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

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

[0128] The other structures of the power module of the third embodiment, such as the integrated power module and the conductive member, are substantially the same as those of the first embodiment and will not be described in detail here.

[0129] Embodiment 4

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

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

[0132] The first winding 221 and the second winding 222 in the fourth embodiment are different from those in the first embodiment. Figure 3d The winding structures shown are basically the same. The width of the winding is greater than the thickness, and the soldering area of ​​the soldering pad of the winding, i.e., the pin of the multi-winding inductor and the switch node soldering pad of the switch unit is large, and the connection impedance is minimized; the first pin 2214 of the multi-winding inductor and the third pin 2224 of the multi-winding inductor are arranged on the first surface of the multi-winding inductor, and are directly connected to the soldering pad of the first switch unit 121 and the soldering pad of the second switch unit 122, so that the connection path between the switch unit and the multi-winding inductor winding is short, which is conducive to reducing impedance and improving efficiency; the second pin 2215 of the multi-winding inductor and the fourth pin 2225 of the multi-winding inductor are arranged on the second surface of the multi-winding inductor, and are directly connected to the load, so that the path between the output of the power supply system and the load is short, which is also conducive to reducing impedance and improving efficiency.

[0133] The positional relationship between the winding and the first magnetic column 213, the second magnetic column 214, the third magnetic column 215, and the fourth magnetic column 216 in the fourth embodiment is basically the same as that in the first embodiment. When the current flows into the first pin and the third pin of the multi-winding inductor and flows out from the second pin and the fourth pin, the magnetic flux formed by the current 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 column 213, the second cover plate 212, and the third magnetic column 215) is Φ1 and Φ2 respectively; the magnetic flux formed by the current 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 column 214, the second cover plate 212, and the fourth magnetic column 216) is Φ3. , Φ4; the magnetic flux Φ1 and Φ2 are of the same magnitude and opposite direction; the magnetic flux Φ3 and Φ4 are of the same magnitude and in the same direction; when the magnetic flux Φ1, Φ2 is greater than Φ3, Φ4, the multi-winding inductor realizes an anti-coupling relationship, and the first pin and the third pin of the multi-winding inductor are mutually opposite terminals; when the magnetic flux Φ1, Φ2 is less than Φ3, Φ4, the multi-winding inductor realizes a positive coupling relationship, and the first pin and the third pin of the multi-winding inductor are mutually the same terminals; when the magnetic flux Φ1, Φ2 is equal to Φ3, Φ4, the multi-winding inductor realizes an unconforming relationship. In order to realize anti-coupling, the first magnetic column 213 and the third magnetic column 215 are provided with an air gap smaller than the second magnetic column 214 and the fourth magnetic column 216 to realize that the magnetic resistance in the path of the magnetic flux Φ1, Φ2 is smaller than the magnetic resistance in the path of the magnetic flux Φ3, Φ4, so that the magnetic flux Φ1, Φ2 is greater than Φ3, Φ4, and anti-coupling is realized.

[0134] In addition, in other embodiments, Fig.9cIn the IUUI core structure shown, the UU structure core composed of the first cover plate 211, the second cover plate 212, the first magnetic column 213, and the third magnetic column 215 is set to a magnetic material with high magnetic permeability, such as ferrite; the II-type magnetic core structure formed by the second magnetic column 214 and the fourth magnetic column 216 is set to a magnetic material with low magnetic permeability, such as a powder core material; when the magnetic circuit of the magnetic flux Φ1, Φ2 has the same ratio of magnetic circuit length to equivalent cross-sectional area as the magnetic circuit of Φ3, Φ4 The magnetic material of the UU-type core has high magnetic permeability, small magnetic resistance, and large magnetic flux Φ1 and Φ2; the magnetic material of the two I-type cores has low magnetic permeability, large magnetic resistance, and small magnetic flux Φ3 and Φ4; the requirement that Φ1 and Φ2 are greater than Φ3 and Φ4 can be achieved; the UU-type core uses magnetic materials with high magnetic permeability, which can make the coupling of the anti-coupled multi-winding inductor better; the two I-type cores use magnetic materials with low magnetic permeability, which can improve the saturation current capacity of the anti-coupled multi-winding inductor.

[0135] like Figure 9b As shown, the conductive members 231, 232, 233, and 234 in the fourth embodiment are respectively arranged on the outside of the second magnetic column 214 and the fourth magnetic column 216, and the first input conductive member 231, the first grounding conductive member 232 and the second input conductive member 233 and the second grounding conductive member 234 are symmetrically arranged on the two opposite sides of the multi-winding inductor; the signal conductive member 241 is arranged on the side of the second cover plate 212. Each conductive member of the input conductive member, the grounding conductive member, and the signal conductive member can form a pad on the first surface and the second surface for power connection or signal transmission between the integrated power module and the inductor, and between the load and the inductor. In this embodiment, the magnetic core is set in the form of an IUUI structure, and each conductive member can completely avoid the air gap to reduce the loss of the edge magnetic flux of the air gap on the conductive member; at the same time, the width of the conductive member can be wider to reduce the DC impedance of the conductive member; the IUUI form of the magnetic core structure is also simpler in mold opening and manufacturing.

[0136] Embodiment 5

[0137] Fig.10a It is a schematic diagram of the structure of another multi-winding inductor of the present invention; Fig.10b yes Fig.10a A perspective view of a multi-winding inductor; Fig.10c yes Fig.10b Sectional view along line BB; Fig.10d yes Fig.10b A top view of Fig.10e yes Fig.10b The cross-sectional view along the CC line. Figures 10a to 10eAs shown, another multi-winding inductor in the fifth embodiment has a magnetic core made of a low magnetic permeability magnetic material with an insulating coating, such as a powder core magnetic material; the inductor is formed by pressing the winding and the magnetic material into one piece, and no air gap is set in the magnetic core. The multi-winding inductor realizes anti-coupling by setting the equivalent cross-section and equivalent magnetic path length of different magnetic columns.

[0138] like Figures 10a to 10e As shown, the magnetic core is an integral structure formed in one piece, and the magnetic core is separated into a first cover plate 211, a second cover plate 212, a first magnetic column 213, a second magnetic column 214, a third magnetic column 215, and a fourth magnetic column 216 by windings. When current flows into the first pin and the third pin of the multi-winding inductor and flows out from the second pin and the fourth pin, the currents in the two windings respectively form magnetic fluxes of Φ1 and Φ2 in the first magnetic circuit (i.e., the magnetic flux path formed by the first cover plate 211, the first magnetic column 213, the second cover plate 212, and the third magnetic column 215); and form magnetic fluxes of Φ3 and Φ2 in the second magnetic circuit (the magnetic flux path formed by the first cover plate 211, the second magnetic column 214, the second cover plate 212, and the fourth magnetic column 216). 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 the multi-winding inductor, by setting the ratio of the equivalent magnetic circuit length of the magnetic flux in the first magnetic circuit to the equivalent cross-sectional area 24L1 / 23S1 smaller than the ratio of the equivalent magnetic circuit length of the magnetic flux in the second magnetic circuit to the equivalent cross-sectional area 24L2 / 23S2, the magnetic flux Φ1, Φ2 is greater than the magnetic flux Φ3, Φ4 to achieve anti-coupling.

[0139] Structurally, the difference in the ratio of the above-mentioned magnetic path length to the equivalent cross-sectional area is achieved by setting the length of the second part of the winding to be different; for example, when the length of the second part of the winding becomes longer, the area of ​​23S1 becomes larger, the area of ​​23S2 becomes smaller, the magnetic path length 24L1 remains unchanged, and 24L2 becomes larger. Therefore, the ratio of the equivalent magnetic path length of the magnetic flux in the first magnetic circuit to the equivalent cross-sectional area 24L1 / 23S1 is smaller than the ratio of the equivalent magnetic path length of the magnetic flux in the second magnetic circuit to the equivalent cross-sectional area 24L2 / 23S2, so as to achieve anti-coupling.

[0140] Embodiment 6

[0141] See also Figures 11a to 11d , Fig.11a This is an assembly diagram of a sixth embodiment of the power module of the present invention (the integrated power module is omitted); Fig.11b yes Fig.11a Exploded diagram of Fig.11c yes Fig.11a An exploded diagram of a first power connection component in a power module; Fig.11d yes Fig.11a Exploded view of the second power connection component in the power module in FIG. Fig.11aand Fig.11b As shown, the power module of the sixth embodiment differs from that of the first embodiment in the specific structure of the conductive member.

[0142] The multiple conductive parts of the power module include at least two groups of power connection components, Fig.11a Two groups are shown: a first power connection assembly and a second power connection assembly provided at two opposite sides of the magnetic core. The first power connection assembly includes a first input conductive member 231 and a first ground conductive member 232 ; the second power connection assembly includes a second input conductive member 233 and a second ground conductive member 234 .

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

[0144] Specifically, the first input conductive member 231 includes a first portion 2311, a second portion 2312, and a third portion 2313; the first grounding conductive member 232 includes a first portion 2321, a second portion 2322, and a third portion 2323. The first portion 2311 of the first input conductive member 231 is arranged on the left side of the upper end of the second portion 2312, the first portion 2321 of the first grounding conductive member 232 is arranged on the right side of the upper end of the second portion 2322, the first portion 2311 of the first input conductive member 231 and the first portion 2321 of the first grounding conductive member 232 respectively form pins on the first surface of the magnetic core for connecting to the integrated power module; the third portion 2313 of the first input conductive member 231 is arranged on the right side of the lower end of the second portion 2312, the third portion 2323 of the first grounding conductive member 232 is arranged on the left side of the lower end of the second portion 2322, the third portion 2313 of the first input conductive member 231 and the third portion 2323 of the first grounding conductive member 232 respectively form pins on the second surface for connecting to the customer's main plate; the second part 2312 of the first input conductive member 231 overlaps with the second part 2322 of the first grounding conductive member 232, and the two parts are insulated and have a short interval, so the loop area between this section of the input conductive members is small, and thus the parasitic inductance is small; the first part 2311 of the first input conductive member 231 and the first part 2321 of the first grounding conductive member 232 are staggered, and the third part 2313 of the first input conductive member 231 and the third part 2323 of the first grounding conductive member 232 are staggered, such staggered arrangement makes the magnetic flux in the loop formed by the first parts 2311, 2321 located on the first surface and the magnetic flux in the loop formed by the third parts 2313, 2323 located on the second surface cancel each other, thereby further reducing the parasitic inductance of the entire loop.

[0145] like Fig.11d As shown, the second power connection assembly includes a second input conductive member 233 and a second ground conductive member 234. The structures of the second input conductive member 233 and the second ground conductive member 234 are similar to those of FIG. Fig.11c The structures of the conductive members 231 and 232 shown are basically the same. Specifically, the second input conductive member 233 includes a first portion 2331, a second portion 2332, and a third portion 2333; the second grounding conductive member 234 includes a first portion 2341, a second portion 2342, and a third portion 2343; the second portions 2332 and 2342 of the conductive members 233 and 234 overlap each other, and there is only the thickness of the insulating layer between the two portions, so the loop area between the conductive members is small, and thus the parasitic inductance is small; the first portion 2331 and the third portion 2333 of the second input conductive member 233 and the first portion 2341 and the third portion 2343 of the second grounding conductive member 234 are staggered on the first surface and the second surface, respectively, and such staggered arrangement makes the magnetic flux in the loop formed by the first portions 2331 and 2341 on the first surface and the magnetic flux in the loop formed by the third portions 2333 and 2343 on the second surface cancel each other, thereby further reducing the parasitic inductance of the entire loop.

[0146] In this embodiment, the parasitic inductance in the conductive element loop is reduced by overlapping the second part of the conductive element and staggering the first part and the third part of the conductive element to improve efficiency.

[0147] Embodiment 7

[0148] See also Figures 12a to 12d , Fig.12a This is an assembly diagram of Embodiment 7 of the power module of the present invention (the integrated power module is omitted); Figure 12b yes Fig.12a Exploded diagram of Fig.12c yes Fig.12a An exploded diagram of a first power connection component in a power module; Fig.12d yes Fig.12a Exploded view of the second power connection component in the power module in FIG. Fig.12a and Figure 12b As shown, the power module of the seventh embodiment differs from that of the first embodiment in the specific structure of the conductive member.

[0149] like Figure 12b and Fig.12cAs shown, the seventh embodiment includes a first power connection component and a second power connection component disposed on two opposite sides of the magnetic core. The first power connection component includes a first input conductive member 231a, a second input conductive member 231b, a first ground conductive member 232a, and a second ground conductive member 232b. The first input conductive member 231a and the second input conductive member 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 conductive member 232a and the second ground conductive member 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 member 231a, the first grounding conductive member 232a, the second input conductive member 231b and the second grounding conductive member 232b are arranged alternately. The first portion 2311 and the second portion 2312 of the first input conductive member 231a and the second input conductive member 231b are arranged alternately with the first portion 2321 and the second portion 2322 of the first grounding conductive member 232a and the second grounding conductive member 232b, respectively forming pins on the first surface of the magnetic core. The fourth portion 2314 and the fifth portion 2315 of the first input conductive member 231a and the second input conductive member 231b are arranged alternately with the fourth portion 2324 and the fifth portion 2325 of the first grounding conductive member 232a and the second grounding conductive member 232b, respectively forming pins on the second surface of the magnetic core. The third portion 2313 of the first input conductive member 231a, the third portion 2323 of the first ground conductive member 232a, the third portion 2313 of the second input conductive member 231b, and the third portion 2323 of the second ground conductive member 232b are alternately overlapped. Since the current directions in the input conductive member and the ground conductive member are opposite, the alternating arrangement of the input conductive member and the ground conductive member helps to reduce the parasitic inductance. Usually, the alternating arrangement of the multi-layer conductive members can be easily realized through the printed circuit board (PCB) process.

[0151] like Fig.12d As shown, the second power connection assembly includes a third input conductive member 233a, a fourth input conductive member 233b, a third ground conductive member 234a, and a fourth ground conductive member 234b. The third input conductive member 233a, the fourth input conductive member 233b, the third ground conductive member 234a, and the fourth ground conductive member 234b are arranged in the same manner as Fig.12a The arrangement of the first input conductive member 231a, the second input conductive member 231b, the first grounding conductive member 232a and the second grounding conductive member 232b is basically the same, and will not be described in detail here.

[0152] Embodiment 8

[0153] See also Figures 13a to 13d , Fig.13a This is an assembly diagram of the eighth embodiment of the power module of the present invention (the integrated power module is omitted); Fig.13b is along Fig.13a A cross-sectional view of the DD line in FIG. Fig.13c yes Fig.13a A schematic diagram of the structure of the bendable substrate when it is not folded; Fig.13d yes Fig.13a Schematic diagram of the structure at another angle when the bendable substrate is not folded.

[0154] like Fig.13a and Fig.13b As shown, the multi-winding inductor structure in the power module of the eighth embodiment is basically the same as that of the first embodiment, including a magnetic core and a winding. The magnetic core includes a first cover plate 211 and a second cover plate 212 arranged opposite to each other, and a first magnetic column 213, a second magnetic column 214, a third magnetic column 215 and a fourth magnetic column 216 connected to the first cover plate 211 and the second cover plate 212. The winding includes a first winding 221 and a second winding 222 arranged 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 power module of the eighth embodiment differs from that of the first embodiment in that it further comprises a bendable substrate, and the conductive member and the like are arranged on the bendable substrate.

[0156] like Fig.13b and Fig.13c As shown, the bendable substrate includes a bottom plate 51, a first side plate 52, a second side plate 53 and a third side plate 54 bent and extended from the side of the bottom plate 51. The first side plate 52 and the second side plate 53 are arranged opposite to each other. The first side plate 52 can be attached to the outer side of the fourth magnetic column 216 of the magnetic core, the second side plate 53 can be attached to the outer side of the second magnetic column 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 to form a first extension portion 520 and a second extension portion 530, respectively.

[0157] like Fig.13b As shown, the bottom 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 bottom plate 51 of the bendable substrate, and then connected to the second pin 2215 through the wiring inside the bendable substrate; the lower end of the second winding 222 can be connected to the bottom plate 51 of the bendable substrate, and then connected to the fourth pin 2225 through the wiring inside the bendable substrate.

[0158] The signal conductive member 241 in the power module of the eighth embodiment can be directly arranged on the third side plate 54; the first power connection assembly including the first input conductive member 231 and the first ground conductive member 232 can be directly arranged on the first side plate 52; the second power connection assembly including the second input conductive member 233 and the second ground conductive member 234 can be directly arranged on the second side plate 53. An output capacitor 60 can also be arranged on the bottom plate 51. The output capacitor 60 is located between the bottom plate 51 and the magnetic core.

[0159] compared to Fig.12a In the combined conductive member structure shown in the eighth embodiment, the input conductive member, the ground conductive member and the signal conductive member can be formed on the bendable substrate in advance, so the conductive member can achieve higher precision, including dimensional precision and relative position precision. This is mainly because the bendable substrate is realized by PCB or flexible PCB process, and PCB or flexible PCB process can achieve higher dimensional precision and relative position precision.

[0160] like Fig.13b As shown, in the eighth embodiment, the output capacitor is arranged between the lower surface of the multi-winding inductor and the bendable substrate, so that the number of output capacitors on the user's mainboard can be reduced to save the space occupied by the output capacitors on the user's mainboard; at the same time, the distance between the output of the power module and the load is shortened, thereby reducing the transmission loss between the power module and the load, and the power supply efficiency of the power module is improved.

[0161] Optionally, a portion of the input capacitor can be arranged between the bottom surface of the multi-winding inductor and the bendable substrate. Compared with arranging the input capacitor on the integrated power module, integrating the input capacitor on the multi-winding inductor can increase the number of input capacitors and reduce the resonance between the input capacitor and the parasitic inductance, thereby reducing losses and improving efficiency.

[0162] A capacitor may be arranged between the upper surface of the multi-winding inductor and the bendable substrate in a manner similar to that of arranging a capacitor between the lower surface of the multi-winding inductor and the bendable substrate.

[0163] In the application embodiments, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0164] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0165] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A multi-winding inductor, characterized in that: include: A magnetic core, comprising a first cover plate, a second cover plate and three magnetic columns, wherein the first cover plate and the second cover plate are arranged opposite to each other, the three magnetic columns include a first magnetic column, a second magnetic column and a third magnetic column, which are arranged in sequence in a counterclockwise direction, and two ends of each magnetic column are respectively connected to the first cover plate and the second cover plate, and A winding assembly, comprising a first winding and a second winding; the first winding and the second winding respectively comprise 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 column is arranged between the first part of the first winding and the first part of the second winding; the second magnetic column is arranged on one side of the first part of the first winding and the third part of the second winding; the third magnetic column is arranged between the third part of the first winding and the third part of the second winding, Among them, the first part of the first winding extends to the first surface of the magnetic core and forms the first pin of the multi-winding inductor on the first surface of the magnetic core, and the third part extends to the second surface of the magnetic core and forms the second pin of the multi-winding inductor on the second surface of the magnetic core; the first part of the second winding extends to the first surface of the magnetic core and forms the third pin of the multi-winding inductor on the first surface of the magnetic core, and the third part extends to the second surface of the magnetic core and forms the fourth pin of the multi-winding inductor on the second surface of the magnetic core, and the first surface and the second surface of the magnetic core are arranged opposite to each other.

2. The multi-winding inductor according to claim 1, characterized in that: The first winding is provided with a notch or a hole, the second winding is provided with a notch or a hole, the first winding and the second winding are cross-arranged 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 according to claim 1, characterized in that: Also includes: A fourth magnetic column, two ends of which are respectively connected to the first cover plate and the second cover plate; and the fourth magnetic column is arranged on one side of the third part of the first winding and the first part of the second winding.

4. The multi-winding inductor according to claim 3, characterized in that: The first magnetic column, the first cover plate, the third magnetic column and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic column, the second cover plate and the fourth magnetic column form a second magnetic circuit; the total magnetic resistance of the first magnetic circuit is less than the total magnetic resistance of the second magnetic circuit.

5. The multi-winding inductor according to claim 3, characterized in that: The first magnetic column, the first cover plate, the third magnetic column and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic column, the second cover plate and the fourth magnetic column form a second magnetic circuit; the total magnetic resistance of the first magnetic circuit is greater than the total magnetic resistance of the second magnetic circuit.

6. The multi-winding inductor according to claim 3, characterized in that: The first magnetic column, the first cover plate, the third magnetic column and the second cover plate form a first magnetic circuit; the first cover plate, the second magnetic column, the second cover plate and the fourth magnetic column 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 according to claim 4, characterized in that: The sum of the air gaps on the first magnetic circuit is smaller than the sum of the air gaps on the second magnetic circuit.

8. The multi-winding inductor according to claim 4, characterized in that: The magnetic permeability of at least part of the magnetic material on the second magnetic column and the fourth magnetic column is lower than the magnetic permeability of the magnetic material on the first magnetic column and the third magnetic column.

9. The multi-winding inductor according to claim 4, characterized in that: The magnetic core is formed of a magnetic material, and a ratio of an equivalent magnetic path length to an equivalent cross-section of the first magnetic path is smaller than a ratio of an equivalent magnetic path length to an equivalent cross-section of the second magnetic path.

10. The multi-winding inductor according to claim 1, characterized in that: The first winding and the second winding are flat wires having a width and a thickness, wherein the thickness is smaller than the width, and wherein the width is parallel to an extension direction of the magnetic column.

11. A power module, characterized in that: include: The multi-winding inductor according to any one of claims 1 to 10; and An integrated power module is stacked on the first surface of the multi-winding inductor and includes at least a first switch unit and a second switch unit. The first switch unit is electrically connected to a first pin of the multi-winding inductor, and the second switch unit is electrically connected to a third pin of the multi-winding inductor.

12. The power module according to claim 11, characterized in that: The first switch unit and the second switch unit are rectangular, the length directions of the first switch unit and the second switch unit are respectively consistent with the width directions of the first winding and the second winding, and the widths of the first winding and the second winding are parallel to the extension direction of the magnetic column.

13. The power module according to claim 11, characterized in that: It also includes a plurality of conductive members, which are arranged around the magnetic core. The conductive members include 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.

14. The power module according to claim 13, characterized in that: The plurality of conductive members include: At least two groups of power connection components are respectively arranged on a first side surface and a second side surface of the multi-winding inductor, wherein the first side surface and the second side surface are arranged opposite to each other; The signal connection component is arranged on the third side and / or the fourth side of the multi-winding inductor.

15. The power module according to claim 14, characterized in that: Each group of the power connection components includes an input conductive member and a ground conductive member; the input conductive member and the ground conductive member each include a first part, a second part and a third part connected in sequence; wherein the second part is arranged on the side of the multi-winding inductor, and the first part and the third part extend to the first surface and the second surface of the multi-winding inductor respectively.

16. The power module according to claim 15, characterized in that: The input conductive member and the ground conductive member of each group of power connection components are arranged side by side.

17. The power module according to claim 15, characterized in that: The first part of the input conductive member and the ground conductive member of each group of the power connection components are staggered; The third parts of the input conductive members and the ground conductive members of each group of the power connection components are staggered; The input conductive member and the second portion of the ground conductive member of each group of the power connection components are stacked.

18. The power module according to claim 14, characterized in that: The signal connection assembly includes a plurality of signal conductive members, and the plurality of signal conductive members are arranged side by side.

19. The power module according to claim 14, characterized in that: Each set of power connection components includes at least two input conductive members and at least two ground conductive members; Each of the input conductive members and each of the ground conductive members comprises a second portion and at least two first portions and at least two third portions respectively extending from two ends of the second portion; The second parts of the at least two input conductive members and the second parts of the at least two ground conductive members are alternately stacked on the side of the multi-winding inductor, each of the first parts extends to the first surface of the multi-winding inductor, and each of the third parts extends to the second surface of the multi-winding inductor; The at least two first portions of the input conductive member and the at least two first portions of the ground conductive member adjacent thereto are arranged alternately; The at least two third portions of the input conductive member and the at least two third portions of the adjacent ground conductive member are arranged alternately.

20. The power module according to claim 13, characterized in that: Also includes: The plurality of conductive elements are disposed on a bendable substrate.

21. The power module according to claim 20, characterized in that: The bendable substrate comprises a bottom plate, a first side plate, a second side plate and a third side plate which are bent and extended from the bottom plate, wherein the first side plate and the second side plate are arranged opposite to each other. Wherein, the plurality of conductive members include a signal connection component and at least two groups of power connection components, the at least two groups of power connection components are respectively arranged on the first side plate and the second side plate, and the signal connection component is arranged on the third side plate.

22. The power module according to claim 21, characterized in that: The device also includes an output capacitor, which is arranged on the bottom plate and located between the second surface of the magnetic core and the bottom plate.

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