Inductance device and power supply

Abstract

The invention relates to an inductance device and a power supply. The inductance device comprises a magnetic core and coupling windings arranged in the magnetic core, pins of the windings are exposed out of the surface of the magnetic core to be connected with a power supply circuit, and the coupling windings comprise a first winding, a second winding, a third winding and a fourth winding; in the magnetic core, the second winding and the third winding are connected with each other to form a series winding, and the series winding is provided with two pins which are exposed out of the surface of the magnetic core so as to be connected with a power supply circuit; the first winding is in magnetic circuit coupling with the second winding, and the fourth winding is in magnetic circuit coupling with the third winding; a pair of pins at the two ends of the first winding and a pair of pins at the two ends of the fourth winding are exposed out of the surface of the magnetic core so as to be connected with a power supply circuit. The inductance device is welded on the circuit board to obtain a power supply, the number of welding spots on the circuit board is reduced, the reliability of circuit connection is higher, and the DCR is smaller.

Description

Technical Field

[0001] The present application relates to the technical field of electronic components, in particular to an inductor device and a power supply. Background Art

[0002] In recent years, with the development of technologies such as data centers and artificial intelligence, the working speeds of central processing units (CPUs), graphics processing units (GPUs), and various integrated chips (ICs) have become faster and faster, and the working current has become larger and larger. Its current value is at the ampere level, in the range of dozens or even hundreds of amperes. The requirements for the power density, efficiency, dynamic performance, etc. of the voltage regulator module (VRM) for its power supply are becoming increasingly stringent, posing very high challenges to the design of the VRM. In the voltage regulator module, the volume of the output inductor often accounts for the highest proportion, and the selection of the inductance value of the inductor directly affects the efficiency and dynamic performance of the entire VRM.

[0003] The Transconductance Inductor Voltage Regulator (TLVR) architecture is a voltage inverter (VR) power supply architecture newly developed in recent years. The biggest difference between it and the traditional DC - DC Buck, DC architecture is that the traditional single - wound ordinary inductor is replaced with a TLVR inductor device similar to a transformer with double windings. The ordinary inductor has only one set of windings with two pins, while the TLVR inductor device has two sets of mutually coupled windings with 4 pins. There are great differences in their structural forms, which can reduce the area occupied on the printed circuit board (PCB).

[0004] In order to provide the working voltage for the central processing unit (CPU), graphics processing unit (GPU), and various integrated chips (ICs), the VRM needs to set multiple TLVR inductor devices. Multiple TLVR inductor devices will increase the volume of the TLVR inductor devices, and the existing TLVR inductor devices also have problems such as a large board - occupying area on the circuit board and the need to occupy more wiring space on the circuit board, resulting in an increase in the direct current resistance (DCR). Summary of the Invention

[0005] The main purpose of the present application is to provide an inductor device to solve the problems that when the existing inductor device is applied to the VRM, due to multiple solder joints, it occupies more wiring space on the circuit board, the electrical connection reliability is low, and it will also cause an increase in the direct current resistance DCR.

[0006] Another object of the present application is to provide a power supply using the inductor device.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] An inductor device includes a magnetic core and a coupling winding disposed within the magnetic core. The pins of the winding are exposed on the surface of the magnetic core to connect to a power supply circuit. The coupling winding includes a first winding, a second winding, a third winding, and a fourth winding. Inside the magnetic core, the second winding and the third winding are connected to each other to form a series winding, and the series winding has two pins exposed on the surface of the magnetic core to connect to the power supply circuit. The first winding is magnetically coupled to the second winding, and the fourth winding is magnetically coupled to the third winding. A pair of pins at both ends of the first winding and a pair of pins at both ends of the fourth winding are exposed on the surface of the magnetic core to connect to the power supply circuit.

[0009] Further, the first winding, the second winding, the third winding, and the fourth winding are configured such that there is a predetermined projection overlap between the first winding and the second winding, and there is a predetermined projection overlap between the third winding and the fourth winding. The second winding and the third winding are primary windings and are connected to the grounded end of the wire of the power supply circuit. The first winding and the fourth winding are secondary windings and are connected to different power stage circuits.

[0010] In some embodiments, the first winding is located on both sides or above and below the second winding. The fourth winding is located on both sides or above and below the third winding.

[0011] In some embodiments, the second winding and the third winding are connected to each other as a series winding inside the magnetic core by one of the following methods: Method 1: One pin of each of the second winding and the third winding is combined together to form an internal conductor connection section, and the two windings are connected in series into an integral series winding by the internal conductor connection section. Method 2: One pin of each of the second winding and the third winding is connected together through an internal conductor connection section, and the two windings are connected in series into an integral series winding by the internal conductor connection section. Method 3: The winding bodies of the second winding and the third winding are directly connected to form a series winding.

[0012] Method 4: The winding bodies of the second winding and the third winding are connected through an internal conductor connection section to form a series winding.

[0013] In some embodiments, the first winding and the fourth winding are U-shaped windings; the second winding and the third winding are U-shaped or Z-shaped windings; the series winding includes a main body portion and the two common pins; the main body portion of the series winding forms a single or multiple U-shaped or Z-shaped or linear shapes; the two common pins of the series winding are bent relative to the main body portion of the series winding and extend to the surface of the magnetic core and are exposed on the surface of the magnetic core, and the two common pins are arranged at the end of the series winding.

[0014] In some embodiments, each of the first winding, the second winding, the third winding, and the fourth winding includes a winding main body and pins; the pins are arranged at the end of the winding main body and are bent relative to the winding main body and extend to the surface of the magnetic core; the cross-sectional shape of the pins of the winding is the same as that of its winding main body; alternatively, the relative width of one or both of the two adjacent pins exposed on the surface of the magnetic core is reduced to increase the distance between the adjacent pins exposed on the surface of the magnetic core and prevent short circuits when the pins are soldered to the circuit board; the ends of the pins of the first winding, the second winding, the third winding, and the fourth winding exposed on the surface of the magnetic core are bent and extended again on the surface of the magnetic core to increase the distance between the adjacent pins exposed on the surface of the magnetic core and expand the area of the pins exposed on the surface of the magnetic core, facilitating the soldering of the pins to the circuit board.

[0015] In some embodiments, the first winding, the second winding, the third winding, and the fourth winding are arranged side by side in a first direction, and the first winding is arranged close to the second winding; the third winding is arranged close to the fourth winding; or the first winding and the fourth winding are arranged side by side in a first direction, and the second winding and the third winding are respectively arranged corresponding to the first winding and the fourth winding in a second direction; wherein, the first direction and the second direction are perpendicular to each other; preferably, the first winding and the second winding are arranged in parallel, and the fourth winding and the third winding are arranged in parallel; the first winding and the fourth winding are the same winding; the second winding and the third winding are the same winding.

[0016] In some embodiments, the ends of the pins of the first winding, the second winding, the third winding, and the fourth winding are exposed on the same plane of the outer surface of the magnetic core. The coupling winding arranged in the magnetic core of the inductor device extends in such a way that the second winding and / or the third winding are connected in series, and for each additional connection of a second winding and / or a third winding, a corresponding first winding or fourth winding is added to form a magnetic path coupling, thereby obtaining a multi-path magnetically coupled integrated inductor.

[0017] The present application further provides a power supply, including a circuit board and the inductor device of any one of the above embodiments, wherein a power supply circuit is arranged on the circuit board; the inductor device is connected to the power supply circuit.

[0018] Further, corresponding to the series winding obtained by connecting the second winding and the third winding in series, the power supply circuit provides welding points for two wire grounding ends; the welding points of the two wire grounding ends are respectively welded and electrically connected to the two farther pins of the series winding obtained by connecting the second winding and the third winding in series. Corresponding to the first winding and the fourth winding, the power supply circuit provides two pairs of welding points; the two pairs of welding points are respectively welded and electrically connected to the two pairs of pins of the first winding and the fourth winding.

[0019] In some embodiments, the power supply is the power supply processor of a server or a data center or a storage system or the power supply for the memory; the working current of the power supply reaches the ampere level.

[0020] In some embodiments, the working current of the power supply is dozens to hundreds of amperes.

[0021] The beneficial effects of this application are as follows:

[0022] For the inductor device of this application, the adjacent pins of the second winding and the third winding inside the magnetic core are connected to each other, and only the two farther pins are exposed on the surface of the magnetic core. Therefore, when the inductor device is connected to the power supply circuit, the number of solder joints is saved, the reliability of the circuit connection is higher, and the DCR is smaller. In addition, since the second winding and the third winding are already connected in series inside the magnetic core, there is no need to arrange the corresponding series circuit on the circuit board, the circuit layout lines are fewer, the wiring space occupied by the circuit board is reduced, and there is more space on the circuit board to arrange components such as chips (such as CPUs and GPUs). Description of the Drawings

[0023] Figure 1 is the front view of the inductor device of the embodiment of this application.

[0024] Figure 2 is the top view of the inductor device of the first embodiment of this application.

[0025] Figure 3 is the perspective view of the inductor device of the first embodiment of this application.

[0026] Figure 4 is the top view of the inductor device of the second embodiment of this application.

[0027] Figure 5 is the perspective view of the inductor device of the second embodiment of this application.

[0028] Figure 6 is the top view of the inductor device of the third embodiment of this application.

[0029] Figure 7 is the perspective view of the inductor device of the third embodiment of this application.

[0030] Figure 8 Schematic diagram of solder joints on the circuit board connected to the TLVR inductor of the present application, where Figures (a) and (b) are different examples of circuit wiring respectively.

[0031] Figure 9 Schematic diagram of solder joints on the circuit board connected to the comparative inductor device, where Figures (a) and (b) are different examples of circuit wiring respectively.

[0032] Figures 10-11 Perspective views of the inductor device of the fourth embodiment of the present application from different perspectives.

[0033] Figure 12 Perspective view of the inductor device of the fifth embodiment of the present application.

[0034] Figure 13 Perspective view of the inductor device of the sixth embodiment of the present application.

[0035] Figure 14 Perspective view of the inductor device of the seventh embodiment of the present application. Detailed implementation manners

[0036] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be fully conveyed to those skilled in the art.

[0037] Although terms such as first and second may be used in the text to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms can only be used to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used in the text. Therefore, the elements, components, regions, layers, or sections discussed below can be referred to as second elements, components, regions, layers, or sections without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative relationship terms may be used in this document to describe the relationship of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", "front end", "rear side", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below" or "beneath" other elements or features will subsequently be oriented as "above" or "over" other elements or features. Thus, the example term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in this document are interpreted accordingly.

[0039] In the following examples, the experimental methods described, unless otherwise specified, are all conventional methods; the reagents and materials described, unless otherwise specified, are all commercially available.

[0040] Please refer to Figures 1-14 As shown, the present application relates to an inductor device 1000, which can be used as a TLVR inductor device and is mainly applied to a power supply with high power and large operating current conditions, such as the power supply of a chip, etc. Its operating current reaches the ampere level and can be as high as dozens to hundreds of amperes. The power supply includes an inductor device 1000 and a circuit board 200. The circuit board 200 is provided with a power supply circuit, and the inductor device 1000 is connected to the power supply circuit of the circuit board 200. The winding of the inductor device 1000 acts with the magnetic core to generate a coupled inductance to achieve the energy storage function.

[0041] The inductor device 1000 of the present application includes a magnetic core 100 and a coupling winding 10 disposed inside the magnetic core 100. The pins of the winding are exposed on the surface of the magnetic core 100 and are connected to the power supply circuit on the circuit board. The coupling winding 10 includes a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4; each winding includes a winding body and pins provided at the ends of the winding body. Among them, one pin is provided at each of the two ends of the winding bodies of the first winding 1 and the fourth winding 4. Therefore, the first winding 1 and the fourth winding 4 each have a pair of pins and are exposed on the magnetic core surface and are connected to the power supply circuit on the circuit board 200. The second winding 2 and the third winding 3 are internally connected to each other (connected between pins or between winding bodies) inside the magnetic core 100 to form a series winding. One end of the winding bodies of the second winding 2 and the third winding 3 are connected to each other, and one pin is provided at the other end (the unconnected end) and is exposed on the magnetic core surface and is connected to the circuit board 200. In the energized state, the first winding 1 and the second winding 2 are magnetically coupled to obtain a first magnetic coupling, and the third winding 3 and the fourth winding 4 are magnetically coupled to obtain a second magnetic coupling. The first winding 1 and the fourth winding 4 can be used as secondary windings and are connected to different power-level circuits on the circuit board 200, and the second winding and the third winding can be used as primary windings and are connected to the wire ground end of the power supply circuit on the circuit board 200.

[0042] Among them, inside the magnetic core 10, the second winding 2 and the third winding 3 have been internally connected to form an integral series winding, and the internal connection can be achieved in the following ways: Method 1: One pin of each of the second winding 2 and the third winding 3, for example, one adjacent pin of each, is combined together to form an internal conductor connection section 23, thereby connecting the two windings in series into an integral series winding; Method 2: One pin of each of the second winding 2 and the third winding 3, for example, one adjacent pin of each, is connected together through an internal conductor connection section, thereby connecting the two windings in series into an integral series winding; Method 3: The winding bodies of the second winding 2 and the third winding 3 are directly connected to form a series winding;

[0043] Method 4: The winding bodies of the second winding 2 and the third winding 3 are connected through an internal conductor connection section 23 to form a series winding.

[0044] In some embodiments, Method 1 and Method 4 are similar. Refer to Figures 2-7 、 Figures 10-13In the illustrated embodiment, the adjacent pins of the second winding 2 and the third winding 3 can be machined into an internal conductor connection section 23 to connect one end of the two winding bodies in the same plane as the winding main body section; alternatively, one end of the second winding 2 and the third winding 3 (without pins provided) can be directly connected together through the internal conductor connection section 23. The unconnected ends of the two winding bodies are each a pin that extends to the surface of the magnetic core after being bent from the winding body to connect to the circuit board 200. For the second method, refer to Figure 14 , one pin each of the adjacent second winding 2 and third winding 3 has its end connected together through the internal conductor connection section 23.

[0045] The second winding 2 and the third winding 3 can be U-shaped or Z-shaped windings for internal connection. When the U-shaped second winding 2 and third winding 3 are not internally connected, the complete U-shaped winding should include a straight or approximately straight winding main body, and two pins (the two arms of the U shape) formed by bending the two ends of the winding main body in the same direction. When the second winding 2 and the third winding 3 are internally connected, through machining, one pin each of the adjacent ones can be combined into the internal conductor connection section 23 to connect the two winding bodies into one body, or one pin each of the adjacent ones can be removed and then the two winding bodies can be connected into one body by a section of the internal conductor connection section 23. The other pin of each winding is retained and exposed on the surface of the magnetic core for connection to the circuit board. When the Z-shaped second winding 2 and third winding 3 are not internally connected, the complete Z-shaped winding should include a straight or approximately straight winding main body, and two pins formed by bending the two ends of the winding main body in opposite directions. When the second winding 2 and the third winding 3 are internally connected, through machining, one pin each of the adjacent ones can be combined into the internal conductor connection section 23 to connect the two winding bodies into one body, or one pin each of the adjacent ones can be removed and then the two winding bodies can be connected into one body by a section of the internal conductor connection section 23. The other pin of each winding is retained and exposed on the surface of the magnetic core for connection to the circuit board 200. When the second winding 2 and the third winding 3 are placed side by side and parallel, after the second winding 2 and the third winding 3 are internally connected, a series winding is formed. The main part of the series winding is U-shaped or Z-shaped (such as Figures 2-7 , Figures 10-11 ), and each of the two ends of the U-shaped or Z-shaped main part of the series winding is a pin (formed by, for example, vertical bending) as a grounding pin exposed on the surface of the magnetic core to connect to the wire grounding end on the circuit board 200. When the second winding 2 and the third winding 3 are linearly connected end to end, refer to Figures 12-13 , the second winding 2 and the third winding 3 are internally connected to form a series winding. The main part of the series winding is straight. Each of the two ends of the straight main part of the series winding is a pin (formed by, for example, vertical bending) as a grounding pin exposed on the surface of the magnetic core. At this time, the series winding obtained by internally connecting the second winding 2 and the third winding 3 as a whole is U-shaped (including the main part and the pins at both ends).

[0046] In other embodiments, referring to Figure 14 , in the second manner described above, the second winding 2 and the third winding 3 are linearly connected with their heads and tails connected, and the ends of two adjacent pins (bent perpendicular to the winding body) are interconnected by an internal connection conductor 23 to form a U-shaped or Z-shaped connection portion, connecting the linear bodies of the front and rear second windings 2 and third windings 3 together.

[0047] It can be understood that the internal connection conductor 23 connecting the second winding 2 and the third winding 3 can be in various shapes.

[0048] The shapes, sizes and arrangement positions of the first winding 1, the second winding 2, the third winding 3 and the fourth winding 4 of the coupled winding 10 can all be adjusted according to the application scenario; there is a certain projection overlap between the first winding 1 and the second winding 2, and between the third winding 3 and the fourth winding 4. The first winding, the second winding, the third winding and the fourth winding are arranged side by side in the first direction, and the first winding is arranged close to the second winding; the third winding is arranged close to the fourth winding; or, the first winding and the fourth winding are arranged side by side in the first direction, and the second winding and the third winding are respectively arranged corresponding to the first winding and the fourth winding in the second direction; wherein, the first direction and the second direction are perpendicular to each other. Among them, the first direction and the second direction can be the x-axis, the y-axis or the z-axis in the xyz coordinate system below or their parallel directions. By way of example, the first winding 1 and the fourth winding 4 are symmetrically arranged on both sides or above or below the combined winding, the first winding 1 is close to the second winding 2, and the fourth winding 4 is close to the third winding 3. The second winding 2 and the third winding 3 can be arranged side by side in parallel or linearly connected with their heads and tails connected; the first winding 1 is arranged parallel to one side or above or below the second winding 2 and the two ends of the two windings are aligned, and the fourth winding 4 is arranged parallel to one side or above or below the third winding 3 and the two ends of the two windings are aligned.

[0049] The inductor device 1000 can also be a multi-magnetic-coupled integrated inductor with two or more paths. The coupling windings 10 provided in the magnetic core 100 include a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4. The series winding is formed by connecting the second winding 2 and the third winding 3. For each additional connected primary winding (the second winding 2 or the third winding 3), a corresponding coupled secondary winding (the first winding or the fourth winding 4) is added accordingly and extended in sequence, thereby obtaining a multi-magnetic-coupled integrated inductor with two or more paths. That is to say, the multi-magnetic-coupled integrated inductor can include odd-path magnetic coupling, or can be, for example, the first winding 1, the second winding 2, the third winding 3, and the fourth winding 4, where the series winding formed by connecting the second winding 2 and the third winding 3 is an even-path magnetic coupling with unit repeated arrangement. Among them, at least one of the second winding 2 and the third winding 3 in the multi-magnetic-coupled integrated inductor is internally connected within the magnetic core 100. The magnetic core 100 can be made into an integral structure by powder-winding in-mold pressing, or assembled from multiple magnets with winding cavities. The power supply circuit of the circuit board 200 can be connected to one or more inductor devices 1000.

[0050] In some embodiments, the inductor device of the present application can be made by a powder-winding in-mold pressing and integral forming process. The coupling winding 10 is arranged inside the magnetic core 100, and the pins are exposed on the surface of the magnetic core. Specifically, the first winding 1, the second winding 2, the third winding 3, and the fourth winding 4 of the coupling winding 10 are placed in the mold cavity at predetermined positions, and the mold cavity is fully filled with magnetic powder for pressing. The forming pressure can be 12 - 24 T / cm2 to obtain one or more inductive green blanks with the coupling windings 10 buried inside the magnetic core 100 and the pins exposed on the surface of the magnetic core 100. The inductive green blank is placed in a heat treatment furnace and heated and kept warm to release the internal residual stress of the inductive green blank, thereby obtaining the high dynamic response inductor device of the embodiment of the present application. The annealing temperature can be 400 - 850 °C.

[0051] The magnetic powder can be a combination of one or several powders such as iron powder, iron-silicon alloy powder, iron-silicon-aluminum alloy magnetic powder, amorphous powder, iron-nickel alloy powder, etc. In some embodiments, the magnetic powder can be an insulating magnetic core powder material, which is uniformly distributed between each winding after being formed by in-mold pressing, so as to form a suitable distance between each winding to achieve an insulating effect; and make the magnetic core 100 in full contact with the winding, achieving rapid heat transfer; in-mold pressing molding makes there be no gap inside the entire inductor device, achieving full space utilization and realizing high power density. The insulating magnetic core powder can form a thin insulating layer between the contact surfaces of each winding of the coupling winding 10, so that the distance between each winding is close enough and insulated from each other, so as to improve the coupling degree between each coupling winding. In other embodiments, an insulating film can be first coated on the surface of each winding 1-4 of the coupling winding 10, and then the inductor device 1000 can be obtained by integrally molding the magnetic powder and the winding through in-mold pressing. Similarly, the distance between each winding is close enough and insulated from each other, so as to improve the coupling degree between each winding. Through in-mold pressing and integral molding, the magnetic core and the winding are in full contact, achieving rapid heat transfer; there is no gap inside the entire device, achieving full space utilization and realizing high power density.

[0052] In some other embodiments, the magnetic core 100 can be a spliced body formed by splicing a plurality of magnets and having a winding cavity inside, and the coupling winding 10 is accommodated in the cavity of the magnetic core, and the pins are exposed on the surface of the magnet.

[0053] In the following embodiments, for the convenience of showing the structure and arrangement of each winding inside the magnetic core 100, the "cavity" for placing the winding is shown inside the magnetic core 100 in the figure. As can be seen from the above, the inside of the cavity can be filled with magnetic powder and each winding 1-4 is fixed by the magnetic powder; or, the cavity is an unfilled magnetic powder cavity. At this time, the magnetic core 100 can be assembled by a plurality of (for example, two halves) magnets, or a cavity is formed inside a single magnet, and a plurality of magnetic body units can be spliced as needed. The magnetic core 100 shown in the figure is square as a whole, but is not limited to being square. The cavity for placing the winding of the magnetic core 100 shown in the figure and described in the following embodiments, its inner bottom wall 110, side wall 120 (and its inner side walls 121 / 122), and top surface 130 do not limit the real or fixed shape or structure inside or on the surface of the magnetic core, and do not limit the magnetic core and the "cavity" inside it to be square, nor limit the inherent shapes and positions of the inner bottom wall 110, side wall 120 (and its inner side walls 121 / 122), and top surface 130 of the magnetic core 100, only for the convenience of describing and showing the relative arrangement of the windings inside the magnetic core.

[0054] Refer to Figures 1-3 and Figure 8In FIG. (a), the inductor device of the first embodiment of the present application is described by taking the example that a coupling winding 10 (a two-way magnetically coupled winding including a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4) is provided in the inner cavity of the magnetic core 100. The winding cavity inside the magnetic core is a space enclosed by an inner bottom wall 110 and surrounding side walls 120. The coupling winding 10 is accommodated in the cavity, and magnetic powder (formed by a powder-winding in-mold pressing integrated process) is filled in the cavity. The magnetic powder is evenly distributed between the windings and fixes the windings; alternatively, no magnetic powder is filled in the cavity, and the windings can be fixed by the card slots on the side walls of the cavity. The pins of the windings are exposed on the surface of the magnetic core 100, such as the top surface 130, to be connected to the power supply circuit on the circuit board 200. The first winding 1 and the fourth winding 4 in the coupling winding 10 are used as secondary windings, each having a pair of pins 11 / 12, 41 / 42 exposed on the surface of the magnetic core 100 to be connected to different power stage circuits in the circuit board 200; the second winding 2 and the third winding 3 are used as primary windings and are connected in series inside the magnetic core, that is, each has only one pin merged into an internal conductor connection section 23 to connect the two windings in series, and the other pin 21, 31 of each is exposed on the surface of the magnetic core 100 as a grounding pin to be connected to the wire grounding end of the power supply circuit; or because the winding bodies of the second winding 2 and the third winding 3 are connected through the internal conductor connection section 23, each winding is provided with only one pin 21, 31 exposed on the surface of the magnetic core 100 to be connected to the wire grounding end of the power supply circuit.

[0055] The first winding 1 and the fourth winding 4 are respectively arranged on both sides of the second winding 2 and the third winding 3. The first winding 1 and the fourth winding 4 are symmetrically arranged, parallel to each other and aligned. The first winding 1 and the fourth winding 4 are U-shaped, and a pair of pins 11 / 12 and 41 / 42 are formed at both ends of each winding. The pins are exposed on the surface of the magnetic core to be connected to the power supply circuit of the circuit board 200. By way of example, the main bodies of the first winding 1 and the fourth winding 4 are equivalent to being laid flat on the bottom wall 110 inside the magnetic core 100. A pair of pins 11 / 12 of the first winding 1 are respectively bent upward from the bottom wall 110 of the inner cavity of the magnetic core and extend along the opposite inner side walls 121 / 122 to the top surface 130 of the magnetic core, and are exposed on the top surface 130 to be electrically connected to a pair of solder joints A1 / A2 of the power supply circuit on the circuit board 200 by soldering; a pair of pins 41 / 42 of the fourth winding 4 are respectively bent upward from the bottom wall 110 of the inner cavity of the magnetic core and extend along the inner side walls 121 / 122 to the top surface 130, and are exposed on the top surface 130 to be soldered and electrically connected to a pair of solder joints B1 / B2 of the power supply circuit on the circuit board 200. The pin 11 of the first winding 1 and the pin 41 of the fourth winding 4 are parallel and side by side on the inner side wall 121 of the inner cavity of the magnetic core, and the pin 12 of the first winding 1 and the pin 42 of the fourth winding 4 are parallel and side by side on the inner side wall 122 (opposite to the inner side wall 121). The ends of the two pairs of pins of the first winding 1 and the fourth winding 4 are exposed on the top surface 130 of the magnetic core to form two pairs of electrodes, which are respectively soldered to two pairs of solder joints on the power supply circuit on the circuit board.

[0056] The second winding 2 and the third winding 3 are U-shaped and arranged side by side in parallel. The two windings are connected inside the magnetic core to form an integral series winding, and the internal connection method refers to the above method 1 or method 4. It can be that one pin adjacent to each of the second winding 2 and the third winding 3 is combined into an internal conductor connection section 23 of the winding 2 and the winding 3 to connect the two windings in series, and the other pins that are farther apart are exposed on the surface of the magnetic core to be connected to the circuit board; or the winding bodies of the second winding 2 and the third winding 3 are connected in series through the internal conductor connection section 23, and a common pair of pins are exposed on the surface of the magnetic core to be connected to the circuit board. For example, the main body part of the integral series winding formed by the mutual connection of the second winding 2 and the third winding 3 inside the magnetic core corresponds to a U shape or a Z shape. Specifically, each of the U-shaped second winding 2 or the third winding 3 includes a linear winding body and pins at the ends. The main bodies of the two windings are parallel, and the pins are parallel; the pins are bent (for example, vertically bent) relative to the corresponding winding bodies and extend. For the internal connection of the second winding 2 and the third winding 3, two adjacent pins of the second winding 2 and the third winding 3 can be combined into a linear internal conductor connection section 23 through machining to connect the two winding bodies to form an integral series structure. The internal conductor connection section 23 is vertically connected to the two parallel winding bodies coplanarly to form the U-shaped main body part of the series winding. A three-dimensional xyz coordinate system can be set. The winding bodies of the second winding 2 and the third winding 3 are located in the xy plane; the two unconnected pins (one pin that is farther apart) 21, 31 are located in the direction parallel to the z axis, at the two ends of the U-shaped main body parts of the two series windings, and remain perpendicular to the U-shaped main body parts; the internal conductor connection section 23 formed by the interconnected pins (two adjacent pins) is located in the xy coordinate plane and is connected to the connection ends of the two parallel winding bodies.

[0057] Preferably, the second winding 2 and the third winding 3 have the same shape and are symmetrically arranged side by side in parallel. The second winding 2 and the third winding 3 are connected and (the main body part of the series winding) is placed flat on the bottom wall 110 inside the magnetic core 100; the pins 21, 31 are bent upward (for example, vertically bent) from the bottom wall 110 respectively and extend along the inner side wall 121 of the inner cavity of the magnetic core 100 to the top surface 130 and are exposed on the top surface 130 of the magnetic core to be welded to a pair of solder joints E2 / F2 of the power supply circuit on the circuit board 200. The two pins 21, 31 are arranged parallel to each other at intervals and are arranged side by side in parallel with the corresponding pins 11, 41 of the first winding 1 and the fourth winding 4. The second winding 2 and the third winding 3 are located between the first winding 1 and the fourth winding 4. For example, the lengths and thicknesses of the main body parts of the four windings are the same, and they are parallel to each other side by side and aligned at both ends.

[0058] The cross-sectional shapes of the windings in the first embodiment are consistent with their pins. For example, the cross-sectional shapes are all square, or can also be circular, oval, other polygons, or other shapes, etc. The main parts of the windings of the first winding 1, the second winding 2, the third winding 3, and the fourth winding 4 are arranged in parallel on the inner bottom wall 110 of the magnetic core 100, and the first winding 1 and the fourth winding 4 are respectively located outside the second winding 2 and the third winding 3.

[0059] Referring to Figures 4-5 and Figure 8 Figure (a) of, the difference between the inductor device 1000 of the second embodiment and the first embodiment is that the cross-sectional sizes of the pins of the first winding 1 and the fourth winding 4 are smaller than the cross-sectional sizes of the corresponding winding bodies. The pins 11 / 12, 41 / 42 can be integrally formed with the winding bodies or machined, or the pins can be separately provided and then vertically welded or contact-connected to the corresponding winding bodies respectively, and can be fixed by magnetic powder during integral molding or by providing card slots on the inner wall of the inner cavity of the magnetic core. Steps are formed at both ends of the pins and the winding bodies, and the outer edges of the pins are aligned with the main parts of the corresponding windings. It can be understood that the steps can also be formed at any part where the pins and the winding bodies are connected to the top surface 130 of the magnetic core 100. When the first winding 1 and the second winding 2 are arranged side by side, steps are provided on the first winding 1, which can increase the distance between the pins 11 and 21 exposed on the surface of the magnetic core, facilitating the soldering of the pins 11, 21 to the circuit board 200 and preventing short circuits; when the third winding 3 and the fourth winding 4 are arranged side by side, steps are provided on the fourth winding 4, which can increase the distance between the pin 41 and the pin 31 exposed on the surface of the magnetic core, facilitating the soldering of its pins 41 and 31 to the circuit board and preventing short circuits. In this embodiment, by reducing the width of the pins, the distance between adjacent two pins on the surface of the magnetic core is increased, facilitating the soldering of the pins to the circuit board and preventing short circuits during soldering. The width of one or both of the two adjacent pins in each of the first winding, the second winding, the third winding, and the fourth winding can be reduced, especially by reducing the relative width of the pins exposed on the surface of the magnetic core, so as to increase the distance between the adjacent pins exposed on the surface of the magnetic core and prevent short circuits when the pins are soldered to the circuit board.

[0060] Referring to Figures 6-7 and Figure 8In FIG. (b), the difference between the inductor device 1000 of the third embodiment and that of the first embodiment is that the second winding 2 and the third winding 3 are Z-shaped. Each of the Z-shaped second winding 2 or third winding 3 includes a straight winding body and a pair of pins at both ends. The pair of pins are bent (for example, vertically bent) relative to the corresponding winding body, and the bending directions are opposite, thus forming a Z shape. When the second winding 2 and the third winding 3 are connected, a pair of adjacent pins of the second winding 2 and the third winding 3 can be combined into an internal conductor connection section 23 through machining to connect the two winding bodies to form an integral series structure. The internal conductor connection section 23 is coplanar with the winding body, forming the Z-shaped main body part of the series winding. One pin 22 and one pin 31 of the second winding 2 and the third winding 3 that are not connected to each other remain in the original state (bent relative to the winding body), and have the same direction, and are (vertically) arranged at the ends of the Z shape of the series winding. The main Z-shaped body part of the series winding formed by connecting the second winding 2 and the third winding 3 inside the magnetic core is equivalent to being placed flat on the bottom wall 110 inside the magnetic core 100. The other pins 22 and 31 of the second winding 2 and the third winding 3 that are farther away are exposed on the surface of the magnetic core to be connected to the ground end of the wire of the power supply circuit on the circuit board 200. The series winding formed by connecting the second winding 2 and the third winding 3 inside the magnetic core is a centrosymmetric structure. The second winding 2 and the third winding 3 have the same shape and are Z-shaped windings, and are arranged side by side and parallel. After the second winding 2 and the third winding 3 are internally connected, the centrosymmetric pins 22 and 31 of the series winding are bent upward (for example, vertically bent) from the bottom wall 110 of the inner cavity of the magnetic core and extend along the inner side walls 121 / 122 of the inner cavity of the magnetic core 100 to the top surface 130, and are parallel and side by side with the corresponding pins of the first winding 1 and the fourth winding 4 respectively. The ends of the centrosymmetric pins 22 and 31 of the series winding after the second winding 2 and the third winding 3 are connected are exposed on the top surface 130 of the magnetic core, and are welded to a pair of solder joints E1 / F2 on the power supply circuit on the circuit board to be electrically connected, realizing electrical connection with the ground end of the wire of the power supply circuit. The second winding 2 and the third winding 3 are located between the first winding 1 and the fourth winding 4. For example, the lengths of the main bodies of the four windings are the same, the thicknesses are the same, and they are arranged side by side and parallel to each other.

[0061] For the inductor device 1000 of each of the above embodiments, the coupling winding 10 provided in the magnetic core 100 includes four windings. Among them, the second winding 2 and the third winding 3 are already connected to each other inside the magnetic core to form an internal series winding. It can be that one pin of each adjacent pair is connected, and the other pin ends of the farther pair are exposed on the surface of the magnetic core. One pair of pin ends of the first winding 1 and the fourth winding 4 are exposed on the surface of the magnetic core. One pair of pins of the first winding 1, one pin of the second winding 2, one pin of the third winding 3, and one pair of pin ends of the fourth winding 4 of the coupling winding 10 provided in the magnetic core 100 are exposed on the surface of the magnetic core and welded to 6 solder joints of the power supply circuit on the circuit board 200 for electrical connection. The power supply circuit on the circuit board 200 does not need to be provided with 8 solder joints, saving the number of solder joints. Moreover, since the second winding 2 and the third winding 3 are already connected inside the magnetic core, the power supply circuit on the circuit board 200 does not need to lay out the corresponding connection lines. Therefore, the electrical connection reliability is higher and the DCR is smaller.

[0062] Referring to Figure 9 , wherein Figure 9 Figure (a) of Figure 8 is compared with Figure (a) of Figure 9 Figure (b) of Figure 8 is compared with Figure (b) of Figure 9 . If the second winding 2 and the third winding 3 in each of the above embodiments are not connected internally, then four pairs of pins of the coupling winding 10 are exposed on the surface of the magnetic core and welded to 8 solder joints of the power supply circuit on the circuit board 200, and it is necessary to wire-connect the solder joints E1 and F1 in the power supply circuit on the circuit board (such as Figure 9 Figure (a)) or wire-connect the solder joints E2 and F1 (such as Figure 9 Figure (b)); in this application, by connecting the second winding 2 and the third winding 3 together inside the magnetic core 100, at this time, the power supply circuit on the circuit board 200 does not need to be provided with the solder joints E1 / F1 or E2 / F1 in

[0063] Referring to Figures 10-11, the inductor device 1000 of the fourth embodiment of the present application includes a magnetic core 100 and a coupling winding 10 disposed within the magnetic core 100. The coupling winding 10 includes a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4. The inductor device 1000 can be integrally formed by powder-in-winding molding or assembled from magnets. Correspondingly, the winding is fixed as an integral structure by powder pressing or fixed by a card slot on the inner wall of the magnetic core cavity. The pins of the winding are exposed on the surface of the magnetic core 100, for example, on the top surface 130, to connect to the power supply circuit on the circuit board. In the coupling winding 10, the first winding 1 and the fourth winding 4 serve as secondary windings and are connected to different power stage circuits in the power supply circuit. The second winding 2 and the third winding 3 serve as primary windings and are connected to the wire grounding end of the power supply circuit. The first winding 1 and the fourth winding 4 are symmetrically arranged; a pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are exposed at the top surface 130 of the magnetic core to connect to different power stage circuits of the circuit board 200. The second winding 2 and the third winding 3 are connected by an internal conductor connection section 23 inside the magnetic core to form an integral series winding, that is, a conductor connection section 23 is merged between one pin of each of the second winding 2 and the third winding 3, and the other pins 21, 31 of each are exposed on the surface of the magnetic core to connect to the wire grounding end of the power supply circuit. The first winding 1 and the fourth winding 4 are correspondingly located above or below the second winding 2 and the third winding 3. Figures 10-11In the exemplary inductor device 1000, the first winding 1 is located below the second winding 2, and the fourth winding 4 is located below the third winding 3, and they are parallel to each other. The first winding 1 and the fourth winding 4 are U-shaped. A pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are bent relative to the main body portion (exemplarily vertically bent, but not limited to vertical bending, the same hereinafter), and the end portions are exposed on the top surface 130 of the magnetic core and are bent again along the top surface 130 (exemplarily vertically bent, but not limited to vertical bending, the same hereinafter) and extend to a pair of opposite sides of the top surface 130. The pins 11 and 41 and the pins 12 and 42 are parallel and spaced apart. The second winding 2 and the third winding 3 are also U-shaped (refer to the first embodiment). Inside the magnetic core 100, a pin of the second winding 2 is connected to a pin of the third winding 3 to obtain an integrated series winding, and the other pins 21 and 31 are vertically bent and the end portions are exposed on the top surface 130 of the magnetic core; the series winding formed by the internal connection of the second winding 2 and the third winding 3, the main body portion of the series winding is also U-shaped, and a pin 21 of the second winding 2 and a pin 31 of the third winding 3 are correspondingly arranged at both ends of the U-shape. The pins are bent relative to the U-shaped main body portion of the series winding (exemplarily vertically bent, but not limited to vertical bending) and extend to the top surface 130 of the magnetic core, and the end portions are bent again along the top surface 130 (exemplarily vertically bent, but not limited to vertical bending, the same hereinafter) to increase the area exposed on the surface of the magnetic core and increase the distance from the pins of the first winding 1 and the fourth winding 4, facilitating welding to the corresponding solder joints of the power supply circuit on the circuit board 200. In this embodiment, the end portions of the pins 11 / 12 of the first winding 1 and the pins 41 / 42 of the fourth winding 4 are bent and extended toward the outer edge on the top surface 130 of the magnetic core 100, and the end portions of the pins 21 of the second winding 2 and the pins 31 of the third winding 3 are bent and extended toward the center of the top surface 130 to increase the distance between the pins exposed on the surface of the magnetic core.

[0064] Refer to Figure 12, the inductor device 1000 of the fifth embodiment of the present application includes a magnetic core 100 and a coupling winding 10 disposed within the magnetic core 100. The coupling winding 10 includes a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4. The pin portions of the windings are exposed on the surface of the magnetic core 100, for example, on the top surface 130, to be connected to the power supply circuit on the circuit board. In the coupling winding 10, the first winding 1 and the fourth winding 4 serve as secondary windings and are connected to different power stage circuits in the power supply circuit, and the second winding 2 and the third winding 3 serve as primary windings and are connected to the wire grounding end of the power supply circuit. The first winding 1 and the fourth winding 4 are symmetrically arranged; a pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are exposed at the top surface 130 of the magnetic core to be connected to different power stage circuits of the circuit board 200. The second winding 2 and the third winding 3 are connected in series within the magnetic core. It can be that a connection section of internal conductors is formed by combining one adjacent pin of the second winding 2 and the third winding 3 to connect the main bodies of the two windings together, and the other pins 21 and 32 at a farther distance are exposed on the surface of the magnetic core to be connected to the wire grounding end of the power supply circuit. The first winding 1 and the fourth winding 4 are correspondingly located above the second winding 2 and the third winding 3. Figure 12In the exemplary inductor device 1000, the second winding 2 and the third winding 3 are U-shaped. Inside the magnetic core, one pin of the second winding 2 and one pin of the third winding 3 are combined and linearly connected to the two winding bodies or can be linearly connected to the two straight winding bodies, resulting in a series winding with a straight main body. The other pins 21 and 32 are bent relative to the winding body and the ends are exposed on the top surface 130 of the magnetic core. The overall series winding (including the winding body and the pins) formed by the internal connection of the second winding 2 and the third winding 3 inside the magnetic core 100 is U-shaped. The two ends (the two side arms of the U shape) correspond to one pin 21 of the second winding 2 and one pin 32 of the third winding 3. The pins extend to the top surface 130 of the magnetic core, are bent again along the top surface 130 and extend towards a pair of opposite sides of the top surface 130 to increase the area exposed on the surface of the magnetic core and increase the distance from the pins of the first winding 1 and the fourth winding 4, facilitating welding to the corresponding solder joints of the power supply circuit on the circuit board 200. The first winding 1 and the fourth winding 4 are accommodated inside the integrated U-shaped series winding formed by the connection of the second winding 2 and the third winding 3. Correspondingly, the first winding 1 is located above the second winding 2, and the fourth winding 4 is located above the third winding 3. The first winding 1 and the fourth winding 4 are placed along the length direction of the winding body part of the integrated series winding formed by the internal connection of the second winding 2 and the third winding 3 and are correspondingly parallel to each other. The first winding 1 and the fourth winding 4 are U-shaped. A pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are vertically bent relative to the main body part (straight shape) and the ends are exposed on the top surface 130 of the magnetic core; and along the top surface 130, the pins 11 / 12 and the pins 41 / 42 are respectively folded inwards again and extended. In this embodiment, the ends of the pins 11 / 12 of the first winding 1 and the pins 41 / 42 of the fourth winding 4 are folded and extended on the top surface 130 of the magnetic core 100, and the ends of the pins 21 of the second winding 2 and the pins of the third winding 3 are bent and extended outwards on the top surface 130 to increase the distance between the pins exposed on the surface of the magnetic core.

[0065] Refer to Figure 13, the inductor device 1000 of the sixth embodiment of the present application includes a magnetic core 100 and a coupling winding 10 disposed within the magnetic core 100. The coupling winding 10 includes a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4. The pins of the windings are exposed on the surface of the magnetic core 100, for example, on the top surface 130, to be connected to the power supply circuit on the circuit board. In the coupling winding 10, the first winding 1 and the fourth winding 4 serve as secondary windings and are connected to different power stage circuits in the power supply circuit, while the second winding 2 and the third winding 3 serve as primary windings and are connected to the wire ground end of the power supply circuit. The first winding 1 and the fourth winding 4 are symmetrically arranged; a pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are exposed at the top surface 130 of the magnetic core to be connected to different power stage circuits of the circuit board 200. The second winding 2 and the third winding 3 are connected in series within the magnetic core. It can be that one pin of each of the adjacent second winding 2 and the third winding 3 is combined or directly connected between the two winding bodies, and the other pins 21 and 32 at the farther ends are exposed on the surface of the magnetic core to be connected to the wire ground end of the power supply circuit. The first winding 1 and the fourth winding 4 are correspondingly arranged side by side and parallel on one side of the second winding 2 and the third winding 3. Figure 13 In the exemplary inductor device 1000, the first winding 1 is located on one side of the second winding 2, and the fourth winding 4 is located on one side of the third winding 3 and are parallel to each other. The first winding 1 and the fourth winding 4 are U-shaped. A pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are perpendicularly bent relative to the winding body (linear shape), and then the ends are exposed at the top surface 130 of the magnetic core and are perpendicularly folded inwards along the top surface 130 and extended. The second winding 2 and the third winding 3 are also U-shaped windings. One pin of the second winding 2 is combined with one pin of the third winding 3 or directly connected by removing the winding body to form an integrated series winding, and the other pins 21 and 32 are perpendicularly bent and the ends are exposed at the top surface 130 of the magnetic core; the integrated series winding formed by connecting the second winding 2 and the third winding 3 inside the magnetic core (including the winding body and the pins) is also U-shaped, and the two ends correspond to one pin 21 of the second winding 2 and one pin 32 of the third winding 3. The pins are perpendicularly bent and extended relative to the main part (linear shape) of the series winding to the top surface 130 of the magnetic core, and are perpendicularly folded inwards along the top surface 130 again to increase the area exposed on the surface of the magnetic core, facilitating soldering to the corresponding solder joints of the power supply circuit on the circuit board 200. In this embodiment, the second winding 2 and the third winding 3 have been connected to form an integrated U-shaped symmetric structure series winding inside the magnetic core, and the two windings are linearly connected at the head and tail. The first winding 1 and the fourth winding 4 are symmetrically and parallelly arranged along the length direction of the linear main part of the integrated U-shaped series winding formed by connecting the second winding and the third winding.

[0066] Refer to Figure 14, the inductor device 1000 of the seventh embodiment of the present application includes a magnetic core 100 and a coupling winding 10 disposed within the magnetic core 100. The coupling winding 10 includes a first winding 1, a second winding 2, a third winding 3, and a fourth winding 4. The pins of the windings are exposed on the surface of the magnetic core 100, for example, on the top surface 130, to be connected to the power supply circuit on the circuit board. In the coupling winding 10, the first winding 1 and the fourth winding 4 serve as secondary windings and are connected to different power stage circuits in the power supply circuit, and the second winding 2 and the third winding 3 serve as primary windings and are connected to the wire ground end of the power supply circuit. The first winding 1 and the fourth winding 4 are symmetrically arranged; a pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are exposed at the top surface 130 of the magnetic core to be connected to different power stage circuits of the circuit board 200. Inside the magnetic core, the second winding 2 and the third winding 3 are connected into an internal series winding, that is, between each adjacent pair of pins of the second winding 2 and the third winding 3 are connected by an internal conductor connection section 23, and the other ends of the farther pins 21 and 32 are exposed on the surface of the magnetic core to be connected to the wire ground end of the power supply circuit. The first winding 1 and the fourth winding 4 are correspondingly arranged side by side and parallel on one side of the second winding 2 and the third winding 3. Figure 14 In the exemplary inductor device 1000, the first winding 1 is located on one side of the second winding 2, the fourth winding 4 is located on one side of the third winding 3, and they are parallel to each other. The first winding 1 and the fourth winding 4 are U-shaped. A pair of pins 11 / 12 of the first winding 1 and a pair of pins 41 / 42 of the fourth winding 4 are vertically bent relative to the (linear) main body part and then the ends are exposed on the top surface 130 of the magnetic core and are vertically folded inward again along the top surface 130 for extension. The second winding 2 and the third winding 3 are also U-shaped. The adjacent pins of the second winding 2 and the third winding 3 are connected into one body by a conductor connection section 23. The other ends of the farther pins 21 and 32 are vertically bent and then exposed on the top surface 130 of the magnetic core; they are vertically folded inward again along the top surface 130 to increase the area exposed on the surface of the magnetic core, facilitating soldering to the corresponding solder joints of the power supply circuit on the circuit board 200. In this embodiment, for the two U-shaped second winding 2 and third winding 3, the ends of the adjacent vertical pins are horizontally connected by a section of conductor connection section 23 to form a winding pair of an integral structure, and the conductor connection section 23 is linear. The series winding formed by connecting the second winding 2 and the third winding 3 inside the magnetic core is an overall structure of three U-shaped windings connected end to end. The middle U-shaped winding is opposite to the U-shaped windings on both sides. The middle U-shaped winding is formed by connecting the adjacent two pins of the second winding 2 and the third winding 3, and the U-shaped windings on both sides correspond to the second winding 2 and the third winding 3 respectively and are parallel and aligned with the U-shaped first winding 1 and fourth winding 4. The middle U-shaped winding corresponds to the interval between the first winding 1 and the fourth winding 4.

[0067] In the inductor device 1000 of the above embodiment, an example is given in which a coupling winding 10 is provided in the magnetic core 100. When the inductor device 1000 is connected to the circuit board 200 and is in the energized state, the first winding 1 and the second winding 2 are magnetically coupled, and the third winding 3 and the fourth winding 4 are magnetically coupled.

[0068] It should be noted that the shapes of the windings of the first winding 1, the second winding 2, the third winding 3, and the fourth winding 4, the cross-sectional sizes, the sizes and arrangement positions of the first winding 1, the second winding 2, the third winding 3, and the fourth winding 4 can all be adjusted according to the application scenario, as long as there is a certain projection overlap between the first winding 1 and the second winding 2, and the third winding 3 and the fourth winding 4. The ends of the winding leads exposed on the surface of the magnetic core can be bent or extended in various ways corresponding to the layout of the solder joints on the circuit board.

[0069] It can be understood that inside the magnetic core 10, the integrally connected series winding inside the second winding 2 and the third winding 3 can have various shapes, not limited to the U-shaped or Z-shaped (single or multiple) in the above various embodiments. The windings provided in the magnetic core 100 are based on a set of coupling windings 10, and a coupling unit is extended by connecting another second winding 2 or third winding 3 and correspondingly adding a first winding 1 or fourth winding 4, so as to obtain a multi-winding and multi-magnetic path integration. The two pairs of leads of each second winding 2 or third winding 3 are connected by a conductor connection section or directly connected into a series winding, and finally the two leads at the head and tail are connected to the two wire grounding ends of the power supply circuit on the circuit board, and the internally connected leads do not need to be soldered on the circuit board. Each second winding 2 or third winding 3 is coupled with a first winding 1 or fourth winding 4. Preferably, the first winding 1 and the fourth winding 4 are the same and are U-shaped windings; the second winding 2 and the third winding 3 are U-shaped or Z-shaped windings.

[0070] When three coupling windings, four coupling windings or even more coupling windings are integrated in the magnetic core 100, the wiring in the PCB board 200 and the solder joints of the power supply circuit on the PCB board 200 can be reduced to a greater extent. When each coupling winding is arranged in an up-and-down manner, for example, the second winding 2 is arranged directly above the first winding 1, and the third winding 3 is arranged directly above the fourth winding 4, the occupied area of the inductor device on the circuit board 200 can be reduced to a greater extent. And when each coupling winding is arranged in an up-and-down manner, compared with the windings in each coupling winding being arranged left and right, the secondary windings in the multi-path magnetic coupling windings can be connected in series in the magnetic core, reducing the number of leads, thereby reducing the wiring in the circuit board 200 and the solder joints on the circuit board 200, and further reducing the DCR to a greater extent and improving the connection reliability between the inductor device and the circuit board 200.

[0071] The inductor device 1000 of each of the above embodiments of the present application is applied to a power supply with high power and large operating current conditions, including but not limited to power supplies for power processors, memories, etc. of servers, data centers, storage systems, etc. The power supply includes the inductor device 1000 and a circuit board 200. The circuit board 200 is provided with a power supply circuit, and the inductor device 1000 is connected to the power supply circuit of the circuit board 200. The power supply using the inductor device of the present application has the following characteristics: 1) In the inductor device of the present application, several second windings and third windings electrically connected to the wire grounding end on the circuit board are already connected in series inside the magnetic core. When connecting to the circuit board, only the head and tail pins of the series-connected whole of several second windings and third windings need to be welded to the solder joints on the circuit board, and there is no need to provide corresponding solder joints for each pair of pins of each second winding and third winding on the circuit board. Therefore, the circuit board 200 saves the number of solder joints, has higher reliability, and smaller DCR; 2) In the inductor device of the present application, several second windings and third windings are already connected in series inside the magnetic core, and there is no need to arrange a corresponding series circuit on the circuit board. There are fewer circuit layout lines, so there is enough space to arrange chips (such as CPUs and GPUs) to increase the chip computing power;

[0072] 3) The inductor device of the present application can be integrated with multiple magnetic circuits and has a smaller volume.

[0073] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The protection scope of the present application is defined by the appended claims and their equivalent scope.

Claims

1. An inductor device, comprising a magnetic core and a coupling winding disposed within the magnetic core, with the pins of the winding exposed on the surface of the magnetic core for connection to a power supply circuit. Characterized in that: The coupling winding includes a first winding, a second winding, a third winding, and a fourth winding; Inside the magnetic core, the second winding and the third winding are interconnected to form a series winding, and the series winding has a total of two pins exposed on the surface of the magnetic core for connection to a power supply circuit; The first winding is magnetically coupled to the second winding, and the fourth winding is magnetically coupled to the third winding; A pair of pins at both ends of the first winding and a pair of pins at both ends of the fourth winding are exposed on the surface of the magnetic core for connection to a power supply circuit.

2. The inductor device according to claim 1, Characterized in that: The first winding, the second winding, the third winding, and the fourth winding are configured such that there is a predetermined overlap in projection between the first winding and the second winding, and there is a predetermined overlap in projection between the third winding and the fourth winding; The second winding and the third winding are primary windings and are connected to the grounded end of the wire of the power supply circuit; The first winding and the fourth winding are secondary windings and are connected to different power stage circuits; The first winding is located on both sides, above, or below the second winding; the fourth winding is located on both sides, above, or below the third winding.

3. The inductor device according to claim 1, Characterized in that: Inside the magnetic core, the second winding and the third winding are interconnected to form a series winding, and the interconnection is achieved by one of the following methods: Method 1: One pin of each of the second winding and the third winding is combined together to form an internal conductor connection section, and the two windings are connected in series into an integral series winding by the internal conductor connection section; Method 2: One pin of each of the second winding and the third winding is connected together through an internal conductor connection section, and the two windings are connected in series into an integral series winding by the internal conductor connection section; Method 3: The winding bodies of the second winding and the third winding are directly connected to form a series winding; Method 4: The winding bodies of the second winding and the third winding are connected through an internal conductor connection section to form a series winding.

4. The inductor device according to claim 3, Characterized in that: The first winding and the fourth winding are U-shaped windings; the second winding and the third winding are U-shaped or Z-shaped windings; The series winding includes a main body portion and the two common pins; the main body portion of the series winding forms a single or multiple U-shaped or Z-shaped or linear shape; the two common pins of the series winding are bent relative to the main body portion of the series winding and extend to the surface of the magnetic core and are exposed on the surface of the magnetic core, and the two common pins are provided at the ends of the series winding.

5. The inductor device according to claim 1, Characterized in that: The first winding, the second winding, the third winding, and the fourth winding each include a winding body and pins; the pins are provided at the ends of the winding body and are bent relative to the winding body and extend to the surface of the magnetic core. The pins of the winding are consistent with the cross-sectional shape of the winding body; or, the relative width of one or both of the two adjacent pins exposed on the surface of the magnetic core is reduced to increase the distance between the adjacent pins exposed on the surface of the magnetic core and prevent short circuit during welding of the pins to the circuit board; The ends of the pins of the first winding, the second winding, the third winding, and the fourth winding exposed on the surface of the magnetic core are bent and extended again on the surface of the magnetic core to increase the distance between the adjacent pins exposed on the surface of the magnetic core and expand the area of the pins exposed on the surface of the magnetic core, facilitating the welding of the pins to the circuit board.

6. The inductor device according to claim 1, characterized in that: The first winding, the second winding, the third winding, and the fourth winding are arranged side by side in a first direction, and the first winding is arranged close to the second winding; the third winding is arranged close to the fourth winding; or, the first winding and the fourth winding are arranged side by side in a first direction, and the second winding and the third winding are respectively arranged corresponding to the first winding and the fourth winding in a second direction; wherein, the first direction and the second direction are perpendicular to each other; The first winding and the second winding are arranged in parallel, and the fourth winding and the third winding are arranged in parallel; The first winding and the fourth winding are the same winding; the second winding and the third winding are the same winding.

7. The inductor device according to claims 1-6, characterized in that: The ends of the pins of the first winding, the second winding, the third winding, and the fourth winding are exposed on the same plane of the outer surface of the magnetic core; The coupling winding arranged in the magnetic core of the inductor device is extended in such a way that the second winding and the third winding are connected in series, and for each additional connection of a second winding and / or a third winding, a corresponding first winding and / or a fourth winding is added to form a magnetic circuit coupling, thereby obtaining a multi-path magnetic coupling integrated inductor.

8. A power supply, comprising a circuit board, and a power supply circuit is arranged on the circuit board; characterized in that: The power supply further comprises the inductor device according to any one of claims 1-7, and the inductor device is connected to the power supply circuit.

9. The power supply according to claim 8, characterized in that: Corresponding to the series winding obtained by connecting the second winding and the third winding to each other inside the magnetic core, the power supply circuit provides welding points for two wire grounding ends; the two welding points of the wire grounding ends are respectively welded and electrically connected to two pins shared by the series winding; Corresponding to the first winding and the fourth winding, the power supply circuit provides two pairs of welding points; the two pairs of welding points are respectively welded and electrically connected to two pairs of pins of the first winding and the fourth winding.

10. The power supply according to claim 8, characterized in that: The power supply is a power supply processor or memory power supply for a server or a data center or a storage system; The working current of the power supply reaches the ampere level; The working current of the power supply is dozens to hundreds of amperes.

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