Voltage regulation circuit, inductor assembly and voltage regulation device

Abstract

The invention provides a voltage regulation circuit which comprises N-phase Buck circuits and an additional branch circuit which are electrically connected in parallel, N is a natural number larger than 1, and N output inductors are coupled or not coupled. The additional branch comprises N-1 additional windings coupled with N-1 inductors, and the N-1 additional windings are sequentially connected in series and are connected with a series inductor in series, so that the response speed to load jump is increased; on the other hand, the invention provides an inductor assembly structure with an additional winding and a winding method, the dynamic inductance of the converter is reduced, and a connection mode for realizing an additional branch is provided; on the other hand, the invention provides the voltage regulation device, and the height of the voltage regulation device is further reduced and parasitic parameters in the voltage regulation device are reduced by optimizing the structure of the inductor assembly, the layout of the bridge arm combination and the structures and connection of the inductor assembly and the first circuit substrate and the second circuit substrate.

Description

Technical Field

[0001] This invention belongs to the field of high-frequency power supply technology, and particularly relates to a voltage regulation circuit, an inductor component, and a voltage regulation device. Background Technology

[0002] In recent years, with the development of technologies such as data centers, artificial intelligence, and supercomputers, more and more powerful ASIC chips have been applied, such as CPUs, GPUs, machine learning accelerator chips, and network switch chips. These chips consume large amounts of current, such as thousands of amperes, and their operating current changes rapidly. Traditionally, voltage regulator modules (VRMs) composed of multiphase buck circuits are used to supply this load. To meet the rapid changes in the operating current of ASIC chips, VRMs increase the transient response performance of the output voltage by increasing the number of phases in the multiphase buck circuit and increasing the capacitance of the output decoupling capacitor. However, due to the large output impedance of VRMs and the space constraints of the output decoupling capacitor, traditional VRMs are not ideal in terms of output voltage transient response. Other techniques to improve the transient response performance of traditional VRM output voltage, such as increasing the switching frequency and / or decreasing the output inductance, can improve the transient response performance, but at the cost of reduced efficiency.

[0003] Therefore, how to develop a voltage regulation circuit, inductor component, and voltage regulation device to solve the problems faced by the existing technology is an urgent issue that needs to be addressed in this field. Summary of the Invention

[0004] In view of this, one of the objectives of the present invention is to provide a voltage regulation circuit, including an input positive terminal, an output negative terminal, a ground terminal, N-phase parallel-connected Buck circuits and additional branches, where N is a natural number greater than 1; each phase of the Buck circuit includes a switching bridge arm and an output inductor; the N switching bridge arms are connected in parallel between the input positive terminal and the ground terminal, the first end of each output inductor is electrically connected to the midpoint of a corresponding switching bridge arm, and the second end of the N output inductors is electrically connected to the output positive terminal;

[0005] The additional branch includes (N-1) additional windings and series inductors, which are connected in series sequentially; the first additional winding is coupled to the first output inductor, the second additional winding is coupled to the second output inductor, and the nth additional winding is coupled to the nth output inductor, where n is a natural number and 1≤n≤(N-1); the additional branch is connected in parallel with the Nth output inductor.

[0006] Preferably, the first end of each of the additional windings is the same as the first end of the coupled inductor winding; the second end of the (n-1)th additional winding is electrically connected to the first end of the nth additional winding.

[0007] Preferably, the N output inductors are coupled within the same inductor core.

[0008] Preferably, the nth additional winding is coupled to the nth output inductor within the same inductor core.

[0009] Preferably, the control signals of the N switch bridge arms are staggered by 360 degrees / N in sequence.

[0010] Preferably, the coupling coefficient between the output inductor and the additional winding is any value between (0.5, 1).

[0011] Preferably, the coupling coefficients among the N output inductors are any values ​​between (-1, 1).

[0012] Another aspect of the present invention provides an inductor assembly, including an inductor core and an inductor frame. The inductor core includes an upper magnetic cover, a lower magnetic cover, and at least two magnetic posts disposed between the upper and lower magnetic covers. The inductor frame includes a top surface, a bottom surface, opposing first and third sides, opposing second and fourth sides, a winding frame, and at least two through slots. The first, second, third, and fourth sides are disposed between the top and bottom surfaces. The through slots penetrate the top and bottom surfaces.

[0013] The winding frame includes an inductor winding and an additional winding, the main body of the inductor winding and the main body of the additional winding being wound along the same path;

[0014] The inductor frame further includes electrical connectors Vo+, SW, and Sig; the electrical connectors Vo+, SW, and Sig are all disposed adjacent to the side of the inductor frame; the electrical connector Vo+ forms a Vo+ end on the bottom surface of the inductor frame, the electrical connector SW forms an SW end on the bottom surface of the inductor frame, and the electrical connector Sig forms Sig ends on the top and bottom surfaces of the inductor frame;

[0015] The first end of the inductor winding is electrically connected to the electrical connector SW, the second end of the inductor winding is electrically connected to the electrical connector Vo+, and the first and second ends of the additional winding are respectively electrically connected to an electrical connector Sig nearby.

[0016] The magnetic core of the inductor passes through the through slot, and the upper and lower magnetic covers are fastened to the winding frame from the top and bottom surfaces, respectively.

[0017] Preferably, the inductor frame further includes a blind slot that extends from the bottom surface of the inductor frame into the winding frame, and the blind slot is used to accommodate the lower magnetic cover.

[0018] Preferably, the depth of the blind groove is greater than or equal to the thickness of the lower magnetic cover.

[0019] Preferably, the inductor frame further includes an independent electrical connector, one end of which is fixed to the bottom surface of the inductor frame, and the other end of which is fixed to and electrically connected to other components; the independent electrical connector is used to transmit power, control signals, or sampling signals.

[0020] Preferably, the independent electrical connector is a copper block.

[0021] Preferably, the inductor frame further includes an electrical connector GND, wherein the electrical connector GND has GND ends formed on the top and bottom surfaces of the inductor frame, respectively.

[0022] Preferably, the inductor core includes two magnetic pillars, there are two through slots, and the inductor winding and the additional winding pass through the two through slots; the electrical connector GND is disposed on the first side of the inductor frame, the electrical connector Vo+ is disposed adjacent to the third side of the inductor frame, the electrical connector SW is disposed adjacent to the first side of the inductor frame, and the electrical connector Sig is disposed adjacent to the first side and / or the third side of the inductor frame.

[0023] Preferably, the inductor core includes four magnetic pillars, the through slots are four, and the inductor assembly includes four inductor windings and three additional windings; one inductor winding and one coupled additional winding are wound around one through slot; the electrical connectors GND, Vo+, SW and Sig are all disposed adjacent to the first and third sides of the inductor frame.

[0024] Preferably, the inductor core further includes a central column, and the inductor frame further includes a central column through slot, through which the central column passes.

[0025] Preferably, the electrical connectors GND, SW, Sig, and Vo+ are implemented by means of drilling, side plating, or embedding copper blocks.

[0026] Preferably, the electrical connector GND is disposed on the first and / or third side of the inductor frame.

[0027] Preferably, the inductor frame is implemented using a printed circuit board.

[0028] Preferably, one magnetic cover of the inductor core is made of a high permeability material and the other magnetic cover is made of a low permeability material, wherein the ratio of high permeability to low permeability is greater than 5.

[0029] In another aspect, the present invention provides an inductor assembly, including an upper magnetic cover, a lower magnetic cover, multiple winding posts, and multiple inductor windings. Each inductor winding includes a horizontal winding segment and two vertical segments, namely an SW segment and a Vo+ segment. The upper and lower magnetic covers are fastened together to form a magnetic core, which includes a top surface, a bottom surface, and four side surfaces. Each horizontal winding segment is located between the upper and lower magnetic covers and is arranged around a winding post. The SW segment and Vo+ segment of each inductor winding are respectively arranged on two adjacent side surfaces of the magnetic core. The Vo+ segment of each inductor winding is adjacent to the SW segment of the next inductor winding. Both ends of each horizontal winding segment are provided with protrusions, and each of the two vertical segments is provided with through holes, which are connected to each other.

[0030] Preferably, the length of the through hole is greater than or equal to half the length of the vertical segment; the thickness of the through hole is approximately equal to the thickness of the horizontal winding segment.

[0031] Preferably, an electrical connection layer is provided between the surface of the protrusion and the surface of the through hole.

[0032] Preferably, the side of the protrusion is provided with a micro-protrusion structure.

[0033] Preferably, the top of the protrusion is chamfered.

[0034] Preferably, the upper magnetic cover and the lower magnetic cover are made of high magnetic permeability material and low magnetic permeability material, respectively, and the ratio of high magnetic permeability to low magnetic permeability is greater than 5.

[0035] Preferably, the inductor assembly further includes a center post located between a plurality of winding posts, and the horizontal winding segment located between the center post and the winding posts.

[0036] Preferably, the winding post and the middle post are integrally formed with the upper magnetic cover, and the winding post, the middle post and the upper magnetic cover are made of the same magnetic permeability material, while the lower magnetic cover is made of a different magnetic permeability material;

[0037] Alternatively, the winding post, the middle post, and the lower magnetic cover are integrally formed, and the winding post, the middle post, and the lower magnetic cover are made of the same magnetic permeability material while the upper magnetic cover is made of a different magnetic permeability material;

[0038] Alternatively, the winding post is integrally formed with one of the magnetic caps and uses a first permeability material, and the middle post is integrally formed with the other magnetic cap and uses a second permeability material, wherein the permeability of the first permeability material and the second permeability material are different.

[0039] Another aspect of the present invention provides a voltage regulation device, including a first circuit board, a second circuit board, and an inductor assembly; the first circuit board includes a through groove, a first pad area, and opposing upper and lower surfaces, the through groove extending through the upper and lower surfaces, and the first pad area disposed on the lower surface of the first circuit board; the second circuit board includes a second pad area, opposing upper and lower surfaces, and the second pad area disposed on the upper surface of the second circuit board.

[0040] The inductor assembly includes an inductor core, a top surface, and a bottom surface. The top surface has at least one top end, and one side of the bottom surface has at least one bottom end. The top end is fixed to a first pad area and electrically connected to a first circuit board. The bottom end is fixed to a second pad area and electrically connected to a second circuit board. The top surface of the inductor core is exposed to the top surface of the voltage regulating device through a through slot.

[0041] The voltage regulation device further includes a switch bridge arm and a BGA array. The switch bridge arm is disposed on the upper surface of the first circuit board and is electrically connected to the top end via the first circuit board and a first soldering area. The BGA array is disposed on the lower surface of the second circuit board and is electrically connected to the bottom end via the second circuit board and a second soldering area.

[0042] Preferably, the vertical projections of the switch bridge arm and the inductor core on the same horizontal plane do not overlap.

[0043] Preferably, the top end is the SW end, which is electrically connected to the midpoint of the switch bridge arm; the bottom end is the Vo+ end, which is electrically connected to a portion of the BGAs in the BGA array.

[0044] Preferably, the inductor assembly further includes an electrical connector GND, which is disposed on the side of the inductor assembly by side copper plating, and GND ends are formed on the top and bottom surfaces of the inductor assembly.

[0045] Preferably, the inductor assembly further includes an electrical connector Sig, which forms a Sig end on the top and / or bottom surface of the inductor assembly.

[0046] Preferably, it further includes a series inductor disposed adjacent to the inductor assembly and electrically connected to the Sig end.

[0047] Preferably, it further includes an independent electrical connector, one end of which is fixed and electrically connected to the first circuit board, and the other end of which is fixed and electrically connected to the second circuit board.

[0048] Preferably, it further includes an input capacitor disposed on the upper and / or lower surface of the first circuit board.

[0049] Preferably, it further includes an output capacitor disposed on the upper surface of the second circuit board.

[0050] Preferably, the output capacitor is disposed on the upper surface of the second circuit board, in the area corresponding to the lower surface of the inductor component.

[0051] The present invention also proposes a voltage regulation device, comprising at least three voltage regulation units, namely a left voltage regulation unit, a middle voltage regulation unit, and a right voltage regulation unit; each voltage regulation unit includes a bridge arm unit, an inductor assembly, and a BGA unit, and the bridge arm unit, inductor assembly, and BGA unit in each voltage regulation unit are electrically connected;

[0052] The bridge arm units, inductor components, and BGA units of the left voltage regulation unit are stacked sequentially in a vertical direction; the bridge arm units, inductor components, and BGA units of the right voltage regulation unit are stacked sequentially in a vertical direction; the bridge arm units and inductor components of the middle voltage regulation unit are stacked in a vertical direction; the bridge arm units of the middle voltage regulation unit are disposed between the left and right bridge arm units, and the inductor components of the middle voltage regulation unit are disposed between the inductor components of the left and right voltage regulation units; the BGA units of the middle voltage regulation unit surround the BGA units of the left and right voltage regulation units.

[0053] Preferably, the system further includes a first circuit board and a second circuit board, each of which has an upper surface and a lower surface; the bridge arm unit is disposed on the upper surface of the first circuit board, and the inductor assembly is disposed between the lower surface of the first circuit board and the upper surface of the second circuit board, wherein the bridge arm unit and the inductor assembly are electrically connected through the first circuit board; the BGA unit is disposed on the lower surface of the second circuit board, and the inductor assembly and the BGA unit are electrically connected through the second circuit board.

[0054] Preferably, the bridge arm unit includes four switch bridge arms, each of which includes a pin SW and a pin Sig, the pin SW and pin Sig being disposed on opposite sides of each switch bridge arm; the inductor assembly includes a magnetic core and windings; the magnetic core has a vertical projection surface on the horizontal plane where the bridge arm unit is located, and each of the pins SW is disposed along the outer side of the vertical projection surface.

[0055] Preferably, the four switch bridge arms are a first switch bridge arm, a second switch bridge arm, a third switch bridge arm, and a fourth switch bridge arm. The pins Sig of the first switch bridge arm and the third switch bridge arm are arranged adjacent to each other and are both in the vertical projection plane; the pins Sig of the second switch bridge arm and the third switch bridge arm are both arranged outside the vertical projection plane.

[0056] Preferably, it further includes a Vin+ electrical connector, a GND electrical connector, and a Sig electrical connector; the Vin+ electrical connector, GND electrical connector, and Sig electrical connector are disposed between the first circuit board and the second circuit board for transmitting power and signals between the first circuit board and the second circuit board; the Vin+ electrical connector is disposed at the four corners of the area where the BGA unit is disposed; each Vin+ electrical connector is disposed adjacent to a GND electrical connector;

[0057] It also includes a Vin+ unit disposed on the lower surface of the second circuit board, wherein the projection of each Vin+ electrical connector on the lower surface of the second circuit board at least partially coincides with the Vin+ unit.

[0058] Preferably, the voltage regulating device includes three left-side voltage regulating units and three right-side voltage regulating units, with the three left-side voltage regulating units arranged adjacent to each other and the three right-side voltage regulating units arranged adjacent to each other.

[0059] Preferably, the seven bridge arm units adopt the same layout structure.

[0060] Another aspect of the present invention provides a voltage regulation device, including a bridge arm unit and an inductor assembly, the bridge arm unit and the inductor assembly being electrically connected and stacked in a vertical direction; the bridge arm unit includes a first switch bridge arm, a second switch bridge arm, a third switch bridge arm and a fourth switch bridge arm, each of the switch bridge arms including a pin SW; the inductor assembly includes a magnetic core and a winding; the magnetic core has a vertical projection surface on the horizontal plane where the bridge arm unit is located, and each pin SW is disposed along the outer side of the vertical projection surface.

[0061] Preferably, it further includes a BGA unit, which is electrically connected to the inductor assembly; the bridge arm unit, the inductor assembly and the BGA unit are stacked in a vertical direction.

[0062] Preferably, the system further includes a first circuit board and a second circuit board, each of which has an upper surface and a lower surface; the bridge arm unit is disposed on the upper surface of the first circuit board, the inductor assembly is disposed between the upper surfaces of the first and second circuit boards, and the bridge arm unit and the inductor assembly are electrically connected through the first circuit board; the BGA unit is disposed on the lower surface of the second circuit board, and the inductor assembly and the BGA unit are electrically connected through the second circuit board.

[0063] It also includes a Vin+ electrical connector, a GND electrical connector, and a Sig electrical connector; the Vin+ electrical connector, GND electrical connector, and Sig electrical connector are disposed between the first circuit board and the second circuit board for transmitting power and signals between the first circuit board and the second circuit board; the Vin+ electrical connector is disposed at the four corners of the area where the BGA unit is disposed; each Vin+ electrical connector is disposed adjacent to a GND electrical connector.

[0064] It also includes a Vin+ unit disposed on the lower surface of the second circuit board, wherein the projection of each Vin+ electrical connector on the lower surface of the second circuit board at least partially coincides with the Vin+ unit.

[0065] Preferably, each of the switch arms includes a pin Sig, and the pin Sig and pin SW are disposed on opposite sides of each switch arm. The pin Sigs of the first and third switch arms are disposed adjacent to each other and are both within the vertical projection plane; the pin Sigs of the second and fourth switch arms are both disposed outside the vertical projection plane. The beneficial effects of the present invention are:

[0066] (1) The present invention proposes a voltage regulation circuit, which includes an N-phase Buck circuit connected in parallel and an additional branch, wherein N is a natural number greater than 1, and the N output inductors are coupled or uncoupled; the additional branch includes N-1 additional inductors coupled with N-1 inductors connected in series and connected in series with a series inductor, thereby improving the response speed to load jumps.

[0067] (2) Another aspect of the present invention provides a unit inductor that combines a circuit board and an inductor core. The unit inductor contains its own power network and can also integrate other power networks and control signals. The number of unit inductors can be selected according to the total power that the voltage regulation device needs to handle or the number of different loads that need to be supplied, thereby simplifying the design and improving the consistency and reliability of each unit of the circuit.

[0068] (3) Another aspect of the present invention provides a voltage regulation device, wherein the top surface of the inductor component is exposed on the first circuit board, so that the inductor core contacts the heat dissipation plate above the module, thereby improving its thermal performance; and the structure and connection of the inductor component with the first circuit board and the second circuit component further reduce the height of the voltage regulation device. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] FIG. 1A and FIG. 1B It is a voltage regulation circuit;

[0071] FIG. 2A to FIG. 2F This describes the structure of an inductor assembly;

[0072] FIG. 2G and FIG. 2H This is the structure of another inductor core;

[0073] FIG. 3A and FIG. 3B This is the structure of another inductor component;

[0074] FIG. 4A to FIG. 4C Here are the structural schematic and exploded view of the voltage regulation device;

[0075] FIG. 5A to FIG. 5E This is a schematic diagram of another voltage regulation device;

[0076] FIG. 6A and FIG. 6B This is the structure of another inductor component;

[0077] FIG. 7A to FIG. 7G This refers to another inductor component and winding structure, as well as its manufacturing process. Detailed Implementation

[0078] One of the core aspects of this invention is to provide a solution for a voltage regulation device that is highly efficient, has high dynamic performance, high reliability, and low cost.

[0079] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0080] The voltage regulation circuit disclosed by the present invention is as shown in FIG. 1A and FIG. 1B shown below. FIG. 1A It is a voltage regulation circuit coupled with an output inductor, hereinafter simply referred to as Circuit Ckt1. FIG. 1B It is a voltage regulation circuit with an additional branch added, hereinafter simply referred to as Circuit Ckt2. Circuit Ckt1 includes N-phase Buck circuits (N is a natural number greater than 1) connected in parallel, and the N-phase Buck circuits are phase-shifted by 360 degrees / N in sequence. Each phase of the Buck circuit includes a switching bridge arm and an output inductor. The first end of the output inductor is electrically connected to the midpoint SW of the switching bridge arm, and the second end of the output inductor is electrically connected to the output positive terminal Vo+. The N-phase output inductors are mutually coupled. The switching bridge arm is connected across the input positive terminal Vin+ and the input negative terminal Vin-. In this embodiment, the input negative terminal Vin- and the output negative terminal Vo- are short-circuited (i.e., the ground terminal GND). Specifically, taking the 4-phase Buck circuit shown in FIG. 1A as an example, the 4-phase Buck circuit includes 4 switching bridge arms HB1 / HB2 / HB3 / HB4 and 4 output inductors L1 / L2 / L3 / L4. The first end of each output inductor is electrically connected to the midpoint SW of a corresponding switching bridge arm, and the second ends of the four output inductors L1 / L2 / L3 / L4 are all electrically connected to the output positive terminal Vo+; the coupling coefficient k between the four output inductors L1 / L2 / L3 / L4 is between (-1, 1), that is, -1 < k < 1; the first ends of the four output inductors L1 / L2 / L3 / L4 are the same-name ends, marked as dot ends. The four switching bridge arms are connected in parallel across the input positive terminal Vin+ and the ground terminal GND. The Buck circuits with 2 phases, 3 phases or more than 4 phases can be correspondingly modified based on the 4-phase Buck circuit.

[0081] Circuit Ckt2 includes N-phase Buck circuits (N is a natural number greater than 1) connected in parallel, and the N-phase Buck circuits are phase-shifted by 360 degrees / N in sequence. Each phase of the Buck circuit includes a switching bridge arm and an output inductor. The first end of the output inductor is electrically connected to the midpoint SW of the switching bridge arm, and the second end of the output inductor is electrically connected to the output positive terminal Vo+. The N-phase output inductors can be mutually coupled or can be N discrete inductors. The switching bridge arm is connected across the input positive terminal Vin+ and the input negative terminal Vin-. In this embodiment, the input negative terminal Vin- and the output negative terminal Vo- are short-circuited (i.e., the ground terminal GND). Circuit Ckt2 further includes (N - 1) additional windings and a series inductor. The (N - 1) additional windings are respectively coupled with the 1st to the (N - 1)th output inductors, and after the (N - 1) additional windings and a series inductor are connected in series in sequence, they are electrically connected in parallel with the Nth output inductor. Specifically, as shown in FIG. 1BTaking the 4-phase Buck circuit shown as an example, the 4-phase Buck circuit includes four switch arms HB1 / HB2 / HB3 / HB4, four output inductors L1 / L2 / L3 / L4, and an additional branch. The additional branch includes three additional windings L1a / L2a / L3a and a series inductor Lc. The first end of each output inductor is electrically connected to the midpoint SW of a corresponding switch arm, and the second ends of the four output inductors L1 / L2 / L3 / L4 are all electrically connected to the positive output terminal Vo+. The four output inductors L1 / L2 / L3 / L4 are not coupled to each other. The four switch arms are connected in parallel across the positive input terminal Vin+ and the ground terminal GND. The additional winding L1a is coupled to the output inductor L1 with a coupling coefficient of k1; and the first end of the additional winding L1a and the first end of the output inductor L1 are the same-named terminals, labeled as point terminals. The additional winding L2a is coupled to the output inductor L2 with a coupling coefficient of k2; and the first end of the additional winding L2a and the first end of the output inductor L2 are of the same name, marked as a point terminal. The additional winding L3a is coupled to the output inductor L3 with a coupling coefficient of k3; and the first end of the additional winding L3a and the first end of the output inductor L3 are of the same name, marked as a point terminal. In the additional branch, the second end of the additional winding L1a is electrically connected to the first end of the additional winding L2a, and the second end of the additional winding L2a is electrically connected to the first end of the additional winding L3a, and then connected in series with the series inductor Lc; this additional branch is connected in parallel across the two ends of the output inductor L4. Here, the coupling coefficients k1, k2, and k3 are all greater than 0.5; the series inductor Lc can be an independent inductor, or it can be the leakage inductance between the additional winding Lna and the output inductor Ln, or the parasitic inductance on the line, or any two or all of the above three. Adding an additional branch can effectively reduce the transient output inductance of the voltage regulator circuit and improve the transient response capability of the load. The additional branch can also be applied to... FIG. 1A The coupled inductors shown also achieve the same technical effect. Furthermore, depending on different power requirements, 2-phase, 3-phase, or more than 4-phase Buck circuits can be configured accordingly. FIG. 1B The 4-phase circuit Ckt2 shown can achieve the same technical effect by adding corresponding additional branches.

[0082] FIG. 2A to FIG. 2F The inductor components 10 and 20 required for circuits Ckt1 and Ckt2 are shown. FIG. 2A and FIG. 2B These are top and bottom view diagrams of inductor assembly 10 / 20, respectively. FIG. 2C and FIG. 2D These are exploded top and bottom views of inductor assembly 10 / 20, respectively. FIG. 2E and FIG. 2F These are top and bottom perspective views of inductor components 10 / 20, respectively.

[0083] The inductor assembly 10 is a single-phase output inductor coupled with an additional winding, including a single-phase inductor core and a single-phase inductor frame 100. Combined with... FIG. 2A to FIG. 2F The single-phase inductor core includes an upper magnetic cover 101, a lower magnetic cover 102, and two inductor columns 103. The two inductor columns 103 are both disposed between the upper magnetic cover 101 and the lower magnetic cover 102, and there is a winding column channel between the two single-phase inductor columns.

[0084] The single-phase inductor frame 100 (i.e., inductor assembly 10) includes opposing first sides 11 and third sides 13, and opposing second sides 12 and fourth sides 14. A winding frame 111 is disposed along a direction extending from the first side 11 to the third side 13 and is disposed adjacent to the top surface of the inductor assembly 10. An inductor winding L1 and an auxiliary winding L1a are disposed within the winding frame 111. The inductor winding L1 or the auxiliary winding L1a can be implemented by internal wiring within the winding frame; it can also be a metal strip embedded within the winding frame, preferably a copper strip; or it can be implemented by electroplating the surface of the winding frame 111. The inductor assembly 10 also includes two through slots 112, recessed inward from the second side 12 and the fourth side 14 into the winding frame 111, respectively, and the through slots 112 penetrate the top and bottom surfaces. The inductor assembly 10 also includes a blind slot 113, which extends inward from the bottom surface of the inductor assembly 10 to the winding frame, and the depth of the blind slot 113 is d1.

[0085] Electrical connector GND is disposed on the outer wall of the first side 11 of the inductor assembly 10. It can be implemented by drilling or side plating, and GND ends are formed on the top and bottom surfaces of the inductor assembly 10, respectively, for welding and electrical connection with other components. Electrical connector Vo+ is disposed on the outer wall of the third side 13 of the inductor assembly. It can also be implemented by drilling or side plating, and Vo+ ends are formed on the top and bottom surfaces of the inductor assembly 10, respectively. Electrical connector Vo+ is electrically connected to the second end of the inductor winding within the single-phase inductor frame 100. Electrical connector SW is disposed adjacent to electrical connector GND and is electrically connected to the first end of the inductor winding disposed within the winding frame 111. Electrical connector SW has an SW end formed on the top surface of the inductor assembly 10, and the SW end is connected to the midpoint of the bridge arm by welding. The single-phase inductor frame 100 also includes multiple electrical connectors Sig, respectively located adjacent to the first side 11 and the third side 13 of the inductor assembly 10. Their positions are not specifically limited. The first and second ends of the additional winding are electrically connected to one electrical connector Sig on the first side 11 and the third side 13, respectively. These two electrical connectors Sig are used to connect the additional branch. Additionally, other electrical connectors Sig can be used for transmitting PWM control signals, current detection, temperature detection, and auxiliary power supply. Electrical connectors SW, Sig, and Vo+ can all be implemented by drilling holes, side plating, or embedding copper blocks. Furthermore, other power networks such as Vin+ can also be integrated into the inductor assembly.

[0086] The single-phase inductor frame 100 can be a printed circuit board, but it is not limited to this; it can also be other types of circuit boards. The single-phase inductor core is fastened to the winding frame 111 from the top and bottom surfaces, respectively. The two inductor posts pass through the two through slots 112, so that the winding frame 111 is accommodated within the winding post channel. The thickness of the lower magnetic cover of the single-phase inductor core is h1. Here, the design ensures that the depth d1 of the blind slot is greater than or equal to h1, so that the surface of the lower magnetic cover of the assembled inductor assembly 10 is recessed into the bottom surface of the inductor frame 100, allowing the various ends of the inductor frame 100 located on the bottom surface to be directly welded and electrically connected to other components.

[0087] Same reference FIG. 2A to FIG. 2F The inductor assembly 20 is a four-phase output inductor, including a four-phase inductor core and a four-phase inductor frame 200. The four-phase inductor core includes an upper magnetic cover 201, a lower magnetic cover 202, and four inductor posts 203. The four inductor posts 203 are all disposed between the upper magnetic cover 201 and the lower magnetic cover 202, and the four inductor posts form a square.

[0088] The four-phase inductor frame 200 (i.e., inductor assembly 20) includes opposing first sides 21 and third sides 23, and opposing second sides 22 and fourth sides 24. The winding frame 211 includes four through slots 212 that penetrate the top and bottom surfaces of the inductor assembly 20 and allow four inductor posts 203 to pass through. The winding frame 211 is positioned adjacent to the top surface of the inductor assembly 20. Inductor windings L1 / L2 / L3 / L4 are disposed within the winding frame 211, and each winding is wound around a through slot 212. The inductor windings L1 / L2 / L3 / L4 can be implemented through internal wiring of the circuit board; they can also be metal strips embedded in the circuit board, with copper being the most preferred; or they can be implemented by electroplating the surface of the winding frame 211. The inductor assembly 20 also includes a blind slot 213, which extends inward from the bottom surface of the inductor assembly 20 to the winding frame 211 and is used to accommodate the lower magnetic cover 202 of the four-phase inductor core; the depth of the blind slot 213 is d2.

[0089] Electrical connectors GND are disposed on the outer walls of the first side 21 and the third side 23 of the inductor assembly 20. This can be achieved through drilling or side plating. GND ends are formed on the top and bottom surfaces of the inductor assembly 20 for welding and electrical connection with other components. Four electrical connectors Vo+ are disposed adjacent to the first side 21 and the third side 23 of the inductor assembly 20, with four Vo+ ends formed on the bottom surface of the inductor assembly 20. Each Vo+ connector is electrically connected to the second end of an inductor winding within the four-phase inductor frame 200. Four electrical connectors SW are disposed adjacent to the first side 21 and the third side 23 of the inductor assembly 20, with four SW ends formed on the top surface of the inductor assembly 20. Each SW connector is electrically connected to the first end of an inductor winding within the four-phase inductor frame 200. Each SW end is connected to the midpoint of a switch arm by welding. The four-phase inductor frame 200 also includes multiple electrical connectors Sig, located adjacent to the first side 21 and / or the third side 23 of the inductor assembly 20. Their positions are not specifically limited. The electrical connectors Sig can be used for transmitting PWM control signals, current detection, temperature detection, and auxiliary power supply. The electrical connectors SW, Sig, and Vo+ can all be implemented by drilling, side plating, or embedding copper blocks. Additionally, other power networks such as Vin+ can also be integrated into the inductor assembly. Optionally, three additional windings L1a / L2a / L3a can also be provided within the inductor assembly 20. These three additional windings L1a / L2a / L3a are wound according to the paths of the inductor windings L1 / L2 / L3, respectively. The first and second ends of each additional winding can be electrically connected to one Sig end, or they can be electrically connected internally within the inductor assembly 20, only connecting to two Sig ends, to achieve the connection of additional branches.

[0090] The four-phase inductor frame 200 can be a printed circuit board, but it is not limited to this; it can also be other types of circuit boards. The four-phase inductor cores are respectively fastened to the winding frame 211 from the top and bottom surfaces, and the four inductor cores pass through the four through slots 212. The thickness of the lower magnetic cover of the four-phase inductor core is h2. Here, the design ensures that the depth of the blind slot d2 ≥ h2, so that the surface of the lower magnetic cover of the assembled inductor assembly 20 is recessed into or flush with the bottom surface of the inductor frame 200, allowing the various ends of the inductor frame 200 located on the bottom surface to be directly welded and fixed to other components and electrically connected.

[0091] To further improve the inductance of the inductor component, it is possible to... FIG. 2A to FIG. 2F Based on the four-phase inductor core shown, an inductor center column 205 is added, such as... FIG. 2G and FIG. 2H As shown. FIG. 2G This is an exploded top view of the inductor assembly 20. FIG. 2H This is a schematic diagram of the bottom surface of the inductor frame 200. Also refer to...FIG. 2G and FIG. 2H The inductor center post 205 is disposed between the four magnetic posts 203; correspondingly, the inductor frame 200 also includes a center post through slot 215, through which the inductor center post 205 is disposed. The winding method of the inductor winding, the arrangement of electrical connectors and ends, and the connection method with other components are all consistent with... FIG. 2A to FIG. 2F The illustrated embodiment is the same and will not be repeated here. Furthermore, inductor saturation can be prevented by adding an air gap to the inductor center column 205 or by using a low-permeability magnetic material. The method of adding a center column is not limited to four-phase inductor cores; other multi-phase inductors can also increase their inductance by adding a center column.

[0092] Here, the inductor assembly 20 is only illustrated with a four-phase coupled inductor as an example. This structure is also applicable to two-phase coupled inductors, three-phase coupled inductors, or coupled inductors with more than four phases. The number and arrangement of the inductor magnetic pillars and the number and arrangement of the through slots can be modified accordingly, which will not be elaborated here.

[0093] In this invention, the inductor core material can be ferrite, iron powder, or a mixture of both. Traditional coupled inductor core materials often use a single ferrite material. In this case, to prevent inductance saturation, an air gap needs to be added to the magnetic circuit to reduce magnetic reluctance. However, the air gap will cut through the surrounding conductors, generating eddy current losses. Alternatively, when using a single iron powder material, the low permeability of the iron powder results in excessively low inductance. Therefore, this invention proposes that one of the two magnetic caps of the inductor core material can be a high-permeability material, such as ferrite, and the other can be a low-permeability material, such as iron powder; here, the ratio of high permeability to low permeability is greater than 5. Simultaneously utilizing the properties of both ferrite and iron powder, a larger inductance can be obtained, eddy current losses caused by the air gap can be avoided, and manufacturing is also easier.

[0094] Optionally, the inductor frame may not include blind slots, meaning the bottom surface of the winding frame and the bottom surface of the inductor frame are coplanar, such as... FIG. 3A and FIG. 3B As shown. Independent electrical connectors 230 are welded to the bottom surface. These independent electrical connectors can be metal blocks or other electrical connectors. The bottom surface or bottom end of these independent electrical connectors, i.e., the required Vo+ end, GND end, or Sig end, is used to fix and electrically connect with other components. Here, copper is preferred as the metal block, but it is not limited to this; any metal with good electrical conductivity is acceptable.

[0095] This invention also discloses the structure of a voltage regulation device, such as... FIG. 4A to FIG. 4C As shown. FIG. 4A This is a schematic diagram of the top surface of the voltage regulating device. FIG. 4B This is an exploded top view of the voltage regulation device.FIG. 4C This is an exploded view of the bottom surface of the voltage regulating device.

[0096] like FIG. 4A to FIG. 4C As shown, the voltage regulation device includes six modules 2 and one module 1, each module sharing a first circuit board 30 and a second circuit board 40. In this application, each module 2 employs a four-phase Buck circuit; module 1 includes three single-phase Buck modules, each employing a one-phase Buck circuit; however, in other applications, the number of phases in each module is not limited to this. The first circuit board 30 includes an opposing upper surface 301 and lower surface 302, a single-phase through slot 303 and a four-phase through slot 304, both of which penetrate the upper surface 301 and the lower surface 302. The switch arms HB are disposed on the upper surface 301, and the input capacitor Cin is disposed on both the upper surface 301 and the lower surface 302. Specifically, every four switch arms HB are disposed around a four-phase through slot 302. In this embodiment, two switch arms HB are disposed adjacent to one side of the four-phase through slot 302, and the other two switch arms HB are disposed on the opposite side. However, this is not a limitation and needs to be determined based on the actual number of phases and the winding method of the inductor winding, as long as the midpoint SW of the switch arm HB is adjacent to the first end of the inductor winding. The input capacitor Cin is disposed adjacent to the input end of the switch arm HB. Each single-phase through slot 301 is adjacent to one switch arm HB, and the three single-phase through slots and three switch arms can be disposed as follows: FIG. 4A The switches can be arranged in a row or horizontally; or three single-phase through slots can be arranged in a row or a row, and the three switch arms can be arranged in another row or another row, without limitation. The only requirement is that the midpoint SW of the switch arm is adjacent to the first end of the inductor winding. Multiple input capacitors Cin and series inductors Lc are disposed on the lower surface 302 of the first circuit board 30, with the input capacitors Cin adjacent to the input end of the switch arm HB and Lc adjacent to module 1. The lower surface 302 also includes a pad area 305 for soldering, fixing, and electrically connecting the inductor components 10 and 20. In this embodiment, the switch arms and the first end of the inductor winding are connected close together, which can effectively reduce parasitic impedance on the power transmission path, reduce transmission loss, and improve the conversion efficiency of the module.

[0097] The upper magnetic cover 101 of the inductor assembly 10 passes through the single-phase through slot 303, and the upper surface of the upper magnetic cover 101 is exposed on the top surface of the voltage regulating device. The end of the top surface of the inductor assembly 10 contacts the lower surface 302, and the end is welded and electrically connected to the corresponding pad provided in the pad area 305. In this embodiment, the exposed upper surface of the upper magnetic cover 101 can effectively dissipate the heat generated by the inductor assembly and reduce the temperature of the inductor assembly; furthermore, the inductor core can be in contact with the heat dissipation plate above the module, further improving the thermal performance of the inductor assembly.

[0098] The second circuit board includes an upper surface 401 and a lower surface 402. The upper surface 401 includes a soldering area 403, on which multiple solder pads are disposed for soldering and fixing to the end of the bottom surface of the inductor assembly or the bottom surface of an independent electrical connector, and for electrical connection. Multiple independent electrical connectors 404 are disposed on the upper surface 401 for transmitting input power, control signals, or sampling signals. These independent electrical connectors 404 include an electrical connector Vin+, which can be disposed adjacent to a switch bridge arm. Each switch bridge arm can be paired with one electrical connector Vin+, or two or more switch bridge arms can share one electrical connector Vin+. These independent electrical connectors 404 can also be electrical connectors GND or Sig. The first end of the independent electrical connector 404 is fixed and electrically connected to the lower surface 302 of the first circuit board, and its second end is fixed and electrically connected to the upper surface 401 of the second circuit board. This enables power transmission or signal transmission between the first circuit board 30 and the second circuit board 40, and also provides a certain mechanical support between the first circuit board and the second circuit board.

[0099] A BGA array is disposed on the lower surface 402 of the second circuit board 40. The BGA array can be an output positive terminal Vo+, a ground terminal GND, an input positive terminal Vin+, or other signal terminals. The layout of the BGA array can be flexibly configured according to customer needs. The BGA array is electrically connected to the pads on the upper surface 401 through wiring within the circuit board.

[0100] In this embodiment, the switch bridge arm and inductor assembly are horizontally arranged, meaning that the projections of the magnetic cores in the switch bridge arm and inductor assembly in the vertical direction do not overlap. Therefore, the utilization rate of the inductor core in the height direction of the module is maximized. The upper magnetic cover surface of the inductor core is exposed to the top surface of the module through a through slot, and the lower magnetic cover is set in the blind slot of the inductor frame. An output capacitor assembly is set at the position corresponding to the blind slot on the upper surface 401 of the second circuit board, which can further improve the dynamic response capability of the module and further reduce the height of the module, making it more suitable for applications with high requirements for module height.

[0101] exist FIG. 4A to FIG. 4C In the voltage regulation device shown, the output terminals of the six modules 2 are independent, while the output terminals of the three single-phase modules within module 1 are connected in parallel. In other embodiments, whether the output terminals of the modules are connected in parallel or independently depends on whether their loads are connected in parallel or independently. In another embodiment, the voltage regulation device may also include only one module. In short, the design can be tailored to the specific power rating and whether the load is independent or not.

[0102] This invention provides another voltage regulation device for multi-output applications. It also uses a multi-phase step-down circuit in parallel. By optimizing the structure of the inductor components and the structural layout of the voltage regulation device, the transient response performance of the output voltage is improved, the efficiency of the voltage regulation device is increased, and the size of the device is further reduced.

[0103] like FIG. 5A A three-dimensional schematic diagram of the voltage regulation device is shown. FIG. 5B This is a partial schematic diagram. For example... FIG. 5A As shown, the voltage regulation device includes a first circuit board 30 and a second board 40; the first circuit board 30 includes an opposing upper surface 301 and a lower surface 302, and the second circuit board 40 includes an opposing upper surface 401 and a lower surface 402. Multiple switch arms HB are disposed on the upper surface 301; the voltage regulation device includes seven voltage regulation units, each voltage regulation unit including one switch arm unit and one inductor assembly; within the same voltage regulation unit, the connection method of the switch arm unit and the inductor assembly can be referred to... FIG. 1A As shown. Each bridge arm unit includes FIG. 1A The circuit Ckt1 shown has four switching bridge arms HB1 / HB2 / HB3 / HB4. On the upper surface 301 of the first circuit board 30, bridge arm unit 7 is positioned in the middle of the upper surface 301. Bridge arm units 1 / 2 / 3 are sequentially positioned to the left of bridge arm unit 7, and bridge arm units 4 / 5 / 6 are sequentially positioned to the right of bridge arm unit 7, i.e., bridge arm unit 7 is positioned between bridge arm units 1 to 6. In this embodiment, the outputs of the seven voltage regulation units can be independent; in other embodiments, the outputs of some regulation units can also be connected in parallel, for example, the outputs of the first / second / third voltage regulation units are connected in parallel, and the outputs of the fourth / fifth / sixth voltage regulation units are connected in parallel. In other embodiments, it may also include only the first voltage regulation unit, the fourth voltage regulation unit, and the seventh voltage regulation unit, with the seventh voltage regulation unit positioned between the first and fourth voltage regulation units. This voltage regulation device may include more than three voltage regulation units, designed according to the layout principles described below.

[0104] For detailed layout of the bridge arm units, please refer to [reference needed]. FIG. 5B As shown, taking bridge arm unit 7 as an example, the signal pins Sig of switch bridge arms HB1 and HB3 are arranged adjacent to each other; and refer to... FIG. 5CInductor components 20-1 to 20-7 are disposed between the first circuit board 30 and the second circuit board 40, with each inductor component corresponding to a bridge arm unit. For example, taking inductor component 20-7 as an example, inductor component 20-7 corresponds to bridge arm unit 7, which includes the four switching bridge arms HB1 / 2 / 3 / 4 in circuit Ckt1. Inductor component 20-7 includes the four coupled inductors in circuit Ckt1, and their connection method can be referred to... FIG. 1A As shown, the first end of each inductor is electrically connected to pin SW of the switch bridge arm, and the second end of each inductor is electrically connected to the positive output terminal. Inductor assembly 20-7 includes four inductor windings, with first end faces of 271 / 272 / 273 / 274 respectively. All four first end faces are disposed adjacent to the first circuit board 30. The vertical projection of inductor assembly 20-7 onto the upper surface 301 is projection area 320 (e.g., ...). FIG. 5B (The area within the dashed box is shown in the image). In this embodiment, the projection area 320 is described as square. The switch pins SW of each switch arm HB are respectively arranged adjacent to one side of the projection area 320, and the signal pins Sig of switch arms HB1 and HB3 are arranged adjacent to each other. The signal pins Sig of switch arms HB1 and HB3 both fall within the projection area 320, while the signal pins Sig of switch arms HB2 and HB4 fall outside the projection area 320. Specifically, the first end face 271 at least partially overlaps with the projection of the switch pin SW of switch arm HB1 on the upper surface 301, the first end face 272 at least partially overlaps with the projection of the switch pin SW of switch arm HB2 on the upper surface 301, the first end face 273 at least partially overlaps with the projection of the switch pin SW of switch arm HB3 on the upper surface 301, and the first end face 274 at least partially overlaps with the projection of the switch pin SW of switch arm HB4 on the upper surface 301. In this embodiment, the projections of the first end face and the corresponding switch pin on the upper surface 301 coincide. This arrangement minimizes the parasitic impedance from the switch bridge arm to the first end face of the winding. FIG. 5A As shown, the layout of bridge arm units 1 / 3 / 4 / 6 is the same as that of bridge arm unit 7; the layout of one of the switch bridge arms in bridge arm units 2 / 5 is slightly different, but its layout principle also follows that the projection of the first end face and the switch pin SW of the switch bridge arm on the upper surface 301 at least partially overlaps.

[0105] Simultaneously refer to FIG. 5C and FIG. 5DA BGA array is disposed on the lower surface 402 of the second circuit board 40. The BGA array on the lower surface 402 includes seven units, namely BGA units 40-1 to 40-7. BGA units 40-1 / 40-2 / 40-3 are arranged adjacent to each other in sequence, and their positions are respectively adjacent to inductor components 20-1 / 20-2 / 20-3; BGA units 40-4 / 40-5 / 40-6 are arranged adjacent to each other in sequence, and their positions are respectively adjacent to inductor components 20-4 / 20-5 / 20-6; BGA unit 40-7 is disposed around BGA units 40-1 / 40-2 / 40-3 and around BGA units 40-4 / 40-5 / 40-6. The above circuit layout minimizes the total parasitic resistance (DCR) between the second end face of the winding in inductor component 20-7 and the Vo+ terminal in BGA unit 40-7; thus giving the seventh voltage regulation unit good dynamic response capability.

[0106] The BGA array also includes Vin+ cells 410, which are arranged on opposite sides of BGA cells 40-1 / 40-2 / 40-3 and on opposite sides of BGA cells 40-4 / 40-5 / 40-6, and the Vin+ cells 410 are surrounded by BGA cells 40-7. Correspondingly, refer to... FIG. 5C Vin+, GND, and Sig electrical connectors are disposed on the upper surface 401 of the second circuit board 40. These connectors are located between the first and second circuit boards 30 and transmit power and signals between them. The Vin+ connectors are positioned near the four corners of the BGA array, and each Vin+ connector corresponds to a Vin+ unit 410. Specifically, the projection of each Vin+ connector onto the lower surface 402 of the second circuit board at least partially overlaps with the Vin+ unit 410, further reducing parasitic impedance on the power input path and minimizing losses in the voltage regulation device. The Sig connectors are positioned between BGA units 40-1 / 40-2 / 40-3 and BGA units 40-4 / 40-5 / 40-6, facilitating the provision of control signals and transmission of sampling signals to each bridge arm unit. In addition, each Vin+ electrical connector is adjacent to a GND electrical connector to reduce parasitic inductance in the input circuit; other GND electrical connectors can be set according to actual needs.

[0107] Additionally, an input capacitor Cin is provided on the upper surface 301 and / or lower surface 302 of the first circuit board 30. The input capacitor Cin can be located between the switch bridge arms, adjacent to the input pins of the switch bridge arms. An output capacitor Co is provided on the upper surface 401 of the second circuit board 40. The output capacitor Co can be located below the inductor assembly, such as... FIG. 5CAs shown, the second end of the inductor winding protrudes from the magnetic cover of the inductor assembly, so that after the inductor assembly is fixedly electrically connected to the second circuit board, a cavity is formed between the inductor assembly and the second circuit board to accommodate the output capacitor Co. In other embodiments, there may be no cavity between the inductor assembly and the second circuit board, and the output capacitor Co can be disposed adjacent to the second end of the inductor assembly.

[0108] FIG. 5E This illustrates another layout of the upper surface 301 of the first circuit board 30, which is similar to... FIG. 5A The difference in the layout shown is that the switching arms in the seven arm units all adopt the same design as... FIG. 5B The same layout structure; bridge arm unit 7 is located in the middle of the upper surface 301, bridge arm units 1 / 2 / 3 are sequentially located to the left of bridge arm unit 7, and bridge arm units 4 / 5 / 6 are sequentially located to the right of bridge arm unit 7, that is, bridge arm unit 7 is located between bridge arm units 1 to 6; the setting direction of bridge arm units 1 to 6 is the same as... FIG. 5B The bridge arm units 1 to 6 are arranged in the same direction, while the bridge arm unit 7 is arranged in a different direction. FIG. 5B The orientation of bridge arm unit 7 is rotated by 90 degrees. In other words, bridge arm units 1 / 2 / 3 and bridge arm units 4 / 5 / 6 are symmetrically arranged along bridge arm unit 7. Using bridge arm units with the same layout structure allows for a symmetrical and uniform arrangement of the seven bridge arm units, improving the consistency of each bridge arm unit.

[0109] To improve the window utilization rate of inductor components, a five-limb magnetic core combined with metal windings is used, such as... FIG. 6A and FIG. 6B As shown. Inductor assemblies 20-1 to 20-7 include an upper magnetic cover 201, a lower magnetic cover 202, a winding post 203, a center post 205, and four metal windings 206. The center post 205 is disposed between the four winding posts 203, and the cavity between the winding posts and the center post is used to accommodate the metal windings 206. In this embodiment, the metal windings 206 are made of copper sheets; in other embodiments, other metals with good conductivity can also be used. Each inductor winding includes a horizontal winding segment, an upwardly bent SW segment, and a downwardly bent Vo+ segment; the horizontal winding segments are respectively placed between the winding posts and the center post, and the SW segment and Vo+ segment of each winding are respectively disposed on adjacent sides of the magnetic core; in the counterclockwise direction, the Vo+ segment of each winding is disposed adjacent to the SW segment of the next winding.

[0110] The upper and lower magnetic covers of the magnetic core can be made of materials with different permeabilities, and the ratio of high permeability to low permeability is greater than or equal to 5; for example, the upper magnetic cover can be made of ferrite with high permeability, and the lower magnetic cover can be made of iron powder with low permeability. This has the advantage of improving the inductor's resistance to current saturation while meeting the coupling coefficient requirements. Furthermore, all magnetic posts can be integrally formed with the upper magnetic cover and made of ferrite; the reluctance of the middle post can be adjusted by regulating the size of the air gap; in extreme cases, increasing the air gap can even eliminate the presence of the middle post. In other embodiments, all magnetic posts can be integrally formed with the lower magnetic cover and made of iron powder; or the winding posts can be integrally formed with the upper magnetic cover and made of ferrite, while the middle post and lower magnetic cover can be integrally formed and made of iron powder. With the above magnetic core, and by employing a simple magnetic core processing technology and a convenient assembly process, the coupling coefficient and resistance to current saturation of the inductor can be optimized.

[0111] The inductor component shown in this embodiment can also be applied to the voltage regulation device shown in the foregoing embodiment; similarly, the inductor component shown in the foregoing embodiment can also be applied to the voltage regulation device shown in this embodiment, and both can obtain the same technical features and benefits, which will not be repeated here.

[0112] FIG. 7A and FIG. 7B Another winding structure is shown, in which at least one of the SW segment or Vo+ segment of each winding extends both upward and downward; for the SW segment, it extends upward from the horizontal segment of the winding to the first circuit board 30, is fixed to and electrically connected to the first circuit board 30, and extends downward to the second circuit board 40, and is mechanically connected to the second circuit board 40; for the Vo+ segment, it extends downward from the horizontal segment of the winding to the second circuit board 40, is fixed to and electrically connected to the second circuit board 40, and extends upward to the first circuit board 30, and is mechanically connected to the first circuit board 30. Preferably, the vertical projection of at least one of the SW segment or Vo+ segment of the winding falls within the projection range of the switch bridge arm.

[0113] In the device structure shown in this embodiment, a heat sink is typically installed above the switch bridge arm to dissipate the heat generated by the switch bridge arm. Heat conduction between the switch bridge arm and the heat sink is achieved through a thermally conductive medium. To ensure good contact of the thermally conductive medium, the heat sink needs to exert a certain pressure on the device. The winding structure shown in this embodiment provides good structural support for the voltage regulation device and solves the problem of poor thermal conduction of the thermally conductive medium due to insufficient support force. On the other hand, the thickness of the first circuit board 30 is typically less than 1.5mm. When the support force is insufficient, the first circuit board 30 will deform under stress, leading to damage and failure of the solder joints on the first circuit board 30, resulting in reduced reliability. The winding structure shown in this embodiment provides sufficient support force for the relevant components in the voltage regulation device, effectively improving the heat dissipation capacity and reliability of the voltage regulation device. Furthermore, the winding structure disclosed in this embodiment provides a downward heat dissipation channel for the voltage regulation device, directly transferring the heat generated by the switch bridge arm through the first circuit board to the winding below, and then transferring the heat to the second circuit board via the shortest vertical path, and dissipating it outward through the system motherboard, further enhancing the heat dissipation capacity of the voltage regulation device. In this embodiment, the inductor assembly 10 includes multiple windings 206. The first end face 271 / 272 / 273 / 274 and the second end face 281 / 282 / 283 / 284 of each winding are fixed to and electrically connected to the first circuit board and the second circuit board, respectively. Because the vertical distance H between the first and second end faces needs to be strictly controlled, the tolerance of the vertical distance H needs to be controlled within + / -100µm; optimally, the tolerance of the vertical distance H is controlled within + / -50µm. In the manufacturing process, to ensure the tolerance distribution of the vertical distance H, integral molding processes such as high-pressure forging, die casting, or MIM (metal injection molding) can be used.

[0114] FIG. 7C and FIG. 7D Another winding structure is shown, in which the SW or Vo+ segment of the winding can extend horizontally, and the SW segment of each winding and the Vo+ segment of the adjacent winding overlap each other vertically. The overlapping parts are isolated by an insulating layer to form a support structure, which can have FIG. 7B The winding structure shown achieves the same technical effect. In the embodiment, the inductor assembly can be formed into windings using sheet metal processing, and then the entire inductor assembly can be formed using injection molding. The tolerance of the vertical distance H can be controlled by the height of the mold. Furthermore, after the injection molding process, the tolerance of the vertical distance H can be further optimized through processes such as milling.

[0115] Furthermore, the present invention illustrates as follows FIG. 7B The detailed structure and manufacturing process of the winding shown are as follows: FIG. 7E to FIG. 7G As shown.FIG. 7E As shown, the H-type winding includes a horizontal section 291 and two vertical sections 292. Two protrusions 293 are respectively provided at both ends of the horizontal section 291. Correspondingly, holes 294 are respectively provided on the two vertical sections 292. The cross-sectional area of ​​the protrusions 293 and the opening size of the holes 294 are similar. Alternatively, the cross-sectional area of ​​the protrusions 293 can be slightly larger than the opening size of the holes 294, so that the protrusions and holes form an interference fit. The interference ratio is in the range of [0.0005, 0.01] x opening size. In detail, the length 'a' of the hole 294 is greater than or equal to half the length 'L' of the vertical segment 292. The longer length 'a' increases the effective connection area between the protruding structure and the hole, ensuring the winding has a lower connection impedance. The width 'b' of the hole 294 is equal to or approximately equal to the thickness of the horizontal segment 291. The wall thicknesses 'a1' and 'a2' of the two holes 294 are both greater than or equal to 0.3 mm, ensuring that the hole 294 exerts a certain constraint on the protruding structure 293. The length of the protruding structure 293 is within the range of [75%, 125%] x the thickness of the vertical segment. Optionally, after the protruding structure 293 passes through the hole 294, the T-shaped connection areas 295 on the horizontal segment 291 and the vertical segment 292 are fitted together or even welded together.

[0116] FIG. 7E The winding component shown in -1 can be formed by direct riveting. FIG. 7E The H-type winding shown in Figure -3. An electrical connection layer can also be provided between the surface of the protrusion 293 and the surface of the hole 294. The average thickness of this electrical connection layer is less than or equal to 30 μm, preferably less than or equal to 15 μm. This electrical connection layer contains at least one tin intermetallic compound (such as Cu3Sn, Cu6Sn5, Ni3Sn4, etc.). After reflow soldering, this electrical connection layer generates a high-temperature intermetallic compound. Because the melting point of the high-temperature intermetallic compound is greater than 300 degrees Celsius, it can effectively prevent the H-type winding from remelting in subsequent reflow soldering processes, effectively reducing displacement, detachment, or deformation of the H-type winding between the horizontal and vertical sections, thereby ensuring the dimensional stability of the H-type winding. Compared to direct riveting, providing an electrical connection layer can reduce the contact impedance between the horizontal and vertical sections; the extremely thin electrical connection layer can ensure extremely low impedance at the connection interface, thereby ensuring the performance and reliability of the inductor assembly.

[0117] In addition to tin intermetallic compounds, the electrical connection layer may also include a tin or tin alloy layer, with the average content of the tin or tin alloy layer being less than or equal to 50% of the electrical connection layer. While ensuring a sufficiently small relative displacement between the horizontal and vertical segments, the tin alloy possesses good fluidity and filling properties, thus further ensuring the connection quality between the horizontal and vertical segments and reducing the impedance of the connection interface. FIG. 7EAs shown in Figure -1, the T-shaped connection area 295 between the horizontal and vertical segments can also be connected by the above electrical connection layer, thereby further reducing the connection impedance between the horizontal and vertical segments.

[0118] In other embodiments, micro-protrusions 296 may be provided on the protrusion 293, with the micro-protrusions 296 disposed on the side of the protrusion 293. This increases the mechanical locking between the horizontal protrusion and the vertical hole. The thinness between the micro-protrusion 296 and the metal sidewall of the hole allows for the formation of a complete intermetallic compound, thereby fixing the relative positional relationship between the horizontal and vertical segments and preventing positional changes during subsequent reflow. Furthermore, the relatively large remaining space between the protrusion 293 and the hole allows for the placement of more tin or tin alloy to form an effective seal, ensuring a low connection impedance between the two.

[0119] In other embodiments, a chamfer 297 is provided at the cross-sectional position of the top of the protrusion 293, such as... FIG. 7G As shown, this facilitates the riveting and assembly process.

[0120] The winding structure disclosed in this invention can be tin-plated or tin alloy-plated on the surfaces of the horizontal and / or vertical sections, with the thickness of the tin or tin alloy layer between 3µm and 15µm; then, an interference fit is achieved between the horizontal and vertical sections through raised structures and holes; and finally, an electrical connection layer is formed between them through reflow soldering. Optionally, flux can be applied to the areas of the mechanically assembled winding that need to be soldered before reflow soldering to better ensure the connection quality of the electrical connection layer. Optionally, this reflow soldering process can be completed simultaneously with the reflow soldering process required for subsequent component assembly, thereby simplifying the process flow. Optionally, when the horizontal and vertical sections are interlocked through raised structures and holes, the T-shaped connection area 295 between the horizontal and vertical sections is ensured to maintain at least partial contact; in the subsequent reflow soldering process, the T-shaped connection area 295 can be electrically connected simultaneously. Optionally, the horizontal and vertical sections undergo surface treatment, such as tin plating or tin alloy plating, and a copper pre-plating layer and / or a nickel anti-diffusion layer can be added. Optionally, the horizontal section surface can be tin-plated, and the vertical section surface can be nickel-gold-plated to further reduce the tolerance of the vertical section height H. In the above embodiments, the copper pre-plating layer thickness is preferably 2µm to 5µm, the nickel anti-diffusion layer thickness is preferably 1.5µm to 5µm, and the gold layer thickness is 0.05µm to 0.15µm.

[0121] FIG. 7A to FIG. 7G The embodiments shown can all adopt the technical features of the foregoing embodiments and can have the same technical effects, which will not be repeated here. FIG. 7A to FIG. 7G The technical features shown can also be used in combination to achieve the same technical effect.

[0122] The switching transistor in the switching bridge arm disclosed in this invention can be a SiMOSFET, SiC MOSFET, GaN Device, or IGBT, etc., all of which can realize the switching function disclosed in this invention.

[0123] The voltage regulation device described in the above embodiments can also be part of an electronic device, as long as it meets the technical features and benefits disclosed in this invention.

[0124] The terms "equal," "identical," or "equal to" disclosed in this invention must take into account the parameter distribution of the engineering process, with an error distribution within ±30%. "Parallel" is defined as the angle between two line segments or lines being less than or equal to 45 degrees. "Perpendicular" is defined as the angle between two line segments or lines being within the range of [60, 120] degrees. The definition of "phase misalignment" also needs to consider the parameter distribution of the engineering process, with an error distribution of the phase misalignment degree within ±30%.

[0125] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0126] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A voltage regulating circuit, characterized by, The Buck circuit includes an input positive terminal, an output positive terminal, a ground terminal, N parallel Buck circuits and an additional branch, N being a natural number greater than 1; each of the Buck circuits includes a switching bridge arm and an output inductor; the N switching bridge arms are connected in parallel between the input positive terminal and the ground terminal; the first end of each of the output inductors is connected to the midpoint of a corresponding switching bridge arm; the second ends of the N output inductors are connected to the output positive terminal; The additional branch includes N-1 additional windings and a series inductor, the N-1 additional windings and the series inductor being connected in series; the first additional winding is coupled to the first output inductor; the second additional winding is coupled to the second output inductor; the nth additional winding is coupled to the nth output inductor, n being a natural number and 1≤n≤N-1; The additional branch is connected in parallel to the Nth output inductor.

2. The voltage regulation circuit of claim 1, wherein, The first end of each of the additional windings is the same as the first end of the coupled output inductor; the second end of the n-1th additional winding is connected to the first end of the nth additional winding.

3. The voltage regulation circuit of claim 2, wherein, The N output inductors are coupled in the same inductor magnetic core.

4. The voltage regulation circuit of claim 2, wherein, The nth additional winding and the nth output inductor are coupled in the same inductor magnetic core.

5. The voltage regulation circuit of claim 1, wherein, The control signals of the N switching bridge arms are sequentially out of phase by 360 degrees / N.

6. The voltage regulation circuit of claim 1, wherein, The coupling coefficient between the output inductor and the additional winding is any value between 0.5 and 1.

7. The voltage regulation circuit of claim 3, wherein, The coupling coefficient between the N output inductors is any value between -1 and 1.

8. An inductive component, characterized by The inductor magnetic core includes an upper magnetic cover, a lower magnetic cover and at least two magnetic columns, the magnetic columns being arranged between the upper magnetic cover and the lower magnetic cover; the inductor frame includes a top surface, a bottom surface, opposite first and third sides, opposite second and fourth sides, a winding frame and at least two through grooves; the first, second, third and fourth sides are arranged between the top surface and the bottom surface; the through grooves pass through the top surface and the bottom surface; The winding frame includes an inductor winding and an additional winding, the main body of the inductor winding and the main body of the additional winding being wound along the same path; The inductor frame further includes an electrical connector Vo+, an electrical connector SW and an electrical connector Sig; the electrical connector Vo+, the electrical connector SW and the electrical connector Sig are arranged adjacent to the sides of the inductor frame; the electrical connector Vo+ forms a Vo+ end on the bottom surface of the inductor frame, the electrical connector SW forms an SW end on the top surface of the inductor frame, and the electrical connector Sig forms a Sig end on the top surface and / or the bottom surface of the inductor frame; The first end of the inductor winding is electrically connected to the electrical connector SW, the second end of the inductor winding is electrically connected to the electrical connector Vo+, and the first and second ends of the additional winding are respectively electrically connected to an electrical connector Sig in proximity; The magnetic columns of the inductor magnetic core pass through the through grooves, and the upper magnetic cover and the lower magnetic cover are respectively buckled to the winding frame from the top surface and the bottom surface.

9. The inductive component of claim 8, wherein, The inductor frame further includes a blind groove, the blind groove being recessed from the bottom surface of the inductor frame to the winding frame.

10. The inductive component of claim 9, wherein, The depth of the blind groove is greater than or equal to the thickness of the lower magnetic cover.

11. The inductive component of claim 8, wherein, The inductance frame further comprises an independent electric connector, one end of which is fixed on the bottom surface of the inductance frame, and the other end of which is fixed and electrically connected with other components; the independent electric connector is used for transmitting power, control signal or sampling signal.

12. The inductive component of claim 11, wherein, The independent electric connector is a copper block.

13. The inductive component of claim 8, wherein, The inductance frame further comprises an electric connector GND, which forms a GND end on the top surface and the bottom surface of the inductance frame respectively.

14. The inductive component of claim 13, wherein, The inductance core comprises two magnetic columns, and the through slot is two, one inductance winding and an additional winding pass between the two through slots; the electric connector GND is arranged on the first side of the inductance frame, the electric connector Vo+ is arranged adjacent to the third side of the inductance frame, the electric connector SW is arranged adjacent to the first side of the inductance frame, and the electric connector Sig is arranged adjacent to the first side and / or the third side of the inductance frame.

15. The inductive component of claim 13, wherein, The inductance core comprises four magnetic columns, the through slot is four, and the inductance assembly comprises four inductance windings and three additional windings; one inductance winding and one additional winding coupled around one through slot; the electric connector GND, the electric connector Vo+, the electric connector SW and the electric connector Sig are arranged adjacent to the first side and the third side of the inductance frame.

16. The inductive component of claim 15, wherein, The inductance core further comprises a middle column, and the inductance frame further comprises a middle column through slot, and the middle column passes through the middle column through slot.

17. The inductive component of claim 13, wherein, The electric connector GND, the electric connector SW, the electric connector Sig and the electric connector Vo+ are realized by punching, side plating or embedding copper block.

18. The inductive component of claim 13, wherein, The electric connector GND is arranged on the first side and / or the third side of the inductance frame.

19. The inductive component of claim 8, wherein, The inductance frame is realized by a printed circuit board.

20. The inductive component of claim 8, wherein, One of the magnetic covers of the inductance core is made of high magnetic permeability material, and the other is made of low magnetic permeability material, and the ratio of high magnetic permeability to low magnetic permeability is greater than 5.

21. An inductive component, comprising: The inductance core comprises an upper magnetic cover, a lower magnetic cover, a plurality of winding columns and a plurality of inductance windings, each of the inductance windings comprises a horizontal winding segment and two vertical segments, and the two vertical segments are respectively an SW segment and a Vo+ segment; the upper magnetic cover and the lower magnetic cover are buckled to form a magnetic core, the magnetic core comprises a top surface, a bottom surface and four side surfaces, each of the horizontal winding segments is arranged around one winding column between the upper magnetic cover and the lower magnetic cover, and the SW segment and the Vo+ segment of each inductance winding are arranged on two adjacent side surfaces of the magnetic core respectively; the Vo+ segment of each inductance winding is arranged adjacent to the SW segment of the next inductance winding; both ends of the horizontal winding segment are provided with protrusions, and through holes are arranged on the two vertical segments, and the protrusions and the through holes are connected in cooperation.

22. The inductive component of claim 21, wherein, The length of the through hole is greater than or equal to half of the length of the vertical segment; the thickness of the through hole is approximately equal to the thickness of the horizontal winding segment.

23. The inductive component of claim 21, wherein, An electric connection layer is arranged between the surface of the protrusion and the surface of the through hole.

24. The inductive component of claim 21, wherein, The side surface of the protrusion is provided with a micro-protrusion structure.

25. The inductive component of claim 21, wherein, The top end of the protrusion is provided with a chamfer.

26. The inductive component of claim 21, wherein, The upper magnetic cover and the lower magnetic cover are respectively made of high magnetic permeability material and low magnetic permeability material, and the ratio of high magnetic permeability to low magnetic permeability is greater than 5.

27. The inductive component of claim 21, wherein, The inductor assembly further comprises a middle column located between the plurality of winding columns, and the horizontal winding segment is located between the middle column and the winding column.

28. The inductive component of claim 27, wherein, The winding column and the middle column are integrally formed with the upper magnetic cover, and the winding column, the middle column and the upper magnetic cover adopt the same magnetic permeability material, and the lower magnetic cover adopts a different magnetic permeability material. Alternatively, the winding column, the middle column and the lower magnetic cover are integrally formed, and the winding column, the middle column and the lower magnetic cover adopt the same magnetic permeability material and the upper magnetic cover adopts a different magnetic permeability material. Alternatively, the winding column is integrally formed with one of the magnetic covers and adopts a first magnetic permeability material, and the middle column is integrally formed with the other magnetic cover and adopts a second magnetic permeability material, and the first magnetic permeability material and the second magnetic permeability material have different magnetic permeability.

29. A voltage regulating device, comprising: The voltage regulating device comprises a first circuit substrate, a second circuit substrate and an inductor assembly; the first circuit substrate comprises a through slot, a first pad area, and opposite upper and lower surfaces, the through slot penetrating the upper and lower surfaces, and the first pad area being arranged on the lower surface of the first circuit substrate; the second circuit substrate comprises a second pad area, and opposite upper and lower surfaces, and the second pad area being arranged on the upper surface of the second circuit substrate; The inductor assembly comprises an inductor magnetic core, and opposite top and bottom surfaces, the top surface is provided with at least one top surface end, and the bottom surface is provided with at least one bottom surface end; the top surface end is fixed on the first pad area and electrically connected with the first circuit substrate; the bottom surface end is fixed on the second pad area and electrically connected with the second circuit substrate; and the top surface of the inductor magnetic core is exposed to the top surface of the voltage regulating device through the through slot; The voltage regulating device further comprises a switching bridge arm and a BGA array, the switching bridge arm is arranged on the upper surface of the first circuit substrate, and the switching bridge arm is electrically connected with the top surface end through the first circuit substrate and the first welding area; and the BGA array is arranged on the lower surface of the second circuit substrate, and the BGA array is electrically connected with the bottom surface end through the second circuit substrate and the second welding area.

30. The voltage regulating device of claim 29, wherein, The vertical projection of the switching bridge arm and the inductor magnetic core on the same horizontal plane does not overlap.

31. The voltage regulating device of claim 29, wherein, The top surface end is an SW end, and the SW end is electrically connected with the bridge arm midpoint of the switching bridge arm; and the bottom surface end is a Vo+ end, and the Vo+ end is electrically connected with part of the BGA in the BGA array.

32. The voltage regulating device of claim 31, wherein, The inductor assembly further comprises an electrical connector GND, which is arranged on the side surface of the inductor assembly through side surface copper plating and forms a GND end on the top surface and the bottom surface of the inductor assembly.

33. The voltage regulating device of claim 31, wherein, The inductor assembly further comprises an electrical connector Sig, which forms a Sig end on the top surface and / or the bottom surface of the inductor assembly.

34. The voltage regulating device of claim 33, wherein, Further comprising a series inductor, which is arranged adjacent to the inductor assembly and is electrically connected with the Sig end.

35. The voltage regulating device of claim 29, wherein, Further comprising an independent electrical connector, one end of which is fixed and electrically connected with the first circuit substrate, and the other end of which is fixed and electrically connected with the second circuit substrate.

36. The voltage regulating device of claim 29, wherein, Further comprising an input capacitor, which is arranged on the upper surface and / or the lower surface of the first circuit substrate.

37. The voltage regulating device of claim 29, wherein, Further comprising an output capacitor, which is arranged on the upper surface of the second circuit substrate.

38. The voltage regulating device of claim 37, wherein, The output capacitor is arranged on the upper surface of the second circuit substrate, and in the region corresponding to the lower surface of the inductor assembly.

39. A voltage regulating device, comprising: The voltage regulating unit comprises at least three voltage regulating units, i.e., a left voltage regulating unit, a middle voltage regulating unit and a right voltage regulating unit; each of the voltage regulating units comprises a bridge arm unit, an inductor assembly and a BGA unit, and the bridge arm unit, the inductor assembly and the BGA unit in each of the voltage regulating units are electrically connected; The bridge arm unit, the inductor assembly and the BGA unit of the left voltage regulating unit are arranged in sequence in the vertical direction; the bridge arm unit, the inductor assembly and the BGA unit of the right voltage regulating unit are arranged in sequence in the vertical direction; the bridge arm unit and the inductor assembly of the middle voltage regulating unit are arranged in the vertical direction; the bridge arm unit of the middle voltage regulating unit is arranged between the left bridge arm unit and the right bridge arm unit, the inductor assembly of the middle voltage regulating unit is arranged between the inductor assembly of the left voltage regulating unit and the inductor assembly of the right voltage regulating unit; and the BGA unit of the middle voltage regulating unit surrounds the BGA unit of the left voltage regulating unit and the BGA unit of the right voltage regulating unit.

40. The voltage regulating device of claim 39, wherein, Further comprising a first circuit substrate and a second circuit substrate, both of which comprise opposite upper surfaces and lower surfaces; the bridge arm unit is arranged on the upper surface of the first circuit substrate, the inductor assembly is arranged between the lower surface of the first circuit substrate and the upper surface of the second circuit substrate, and the bridge arm unit and the inductor assembly are electrically connected through the first circuit substrate; and the BGA unit is arranged on the lower surface of the second circuit substrate, and the inductor assembly and the BGA unit are electrically connected through the second circuit substrate.

41. The voltage regulating device of claim 40, wherein, The bridge arm unit comprises four switching bridge arms, each of which comprises a pin SW and a pin Sig, and the pin SW and the pin Sig are arranged on opposite sides of each switching bridge arm; the inductor assembly comprises a magnetic core and a winding; the magnetic core has a vertical projection plane in the horizontal plane where the bridge arm unit is located, and each pin SW is arranged on the outside of the vertical projection plane.

42. The voltage regulating device of claim 41, wherein, The four switching bridge arms are respectively a first switching bridge arm, a second switching bridge arm, a third switching bridge arm and a fourth switching bridge arm, the pins Sig of the first switching bridge arm and the third switching bridge arm are arranged adjacent to each other and are both in the vertical projection plane; the pins Sig of the second switching bridge arm and the third switching bridge arm are both arranged outside the vertical projection plane.

43. The voltage regulating device of claim 40, wherein, Further comprising a Vin+ electrical connector, a GND electrical connector and a Sig electrical connector; the Vin+ electrical connector, the GND electrical connector and the Sig electrical connector are arranged between the first circuit substrate and the second circuit substrate, and are used to transmit power and signals between the first circuit substrate and the second circuit substrate; the Vin+ electrical connector is arranged adjacent to the four corners of the region where the BGA unit is arranged; and each Vin+ electrical connector is adjacent to one GND electrical connector; The Vin+ unit is arranged on the lower surface of the second circuit substrate, and the projection of each Vin+ electrical connector on the lower surface of the second circuit substrate at least partially overlaps the Vin+ unit.

44. The voltage regulating device of claim 39, wherein, The voltage regulating device comprises three left voltage regulating units and three right voltage regulating units, the three left voltage regulating units are arranged adjacently, and the three right voltage regulating units are arranged adjacently.

45. The voltage regulating device of claim 44, wherein, The seven bridge arm units adopt the same layout structure.

46. A voltage regulating device, comprising: The bridge arm unit and the inductor assembly are electrically connected and arranged in a vertical stacking manner; the bridge arm unit comprises a first switch bridge arm, a second switch bridge arm, a third switch bridge arm and a fourth switch bridge arm, each of the switch bridge arms comprises a pin SW; the inductor assembly comprises a magnetic core and a winding; the magnetic core has a vertical projection plane on the horizontal plane where the bridge arm unit is located, and each pin SW is arranged on the outer side of the vertical projection plane.

47. The voltage regulating device of claim 46, wherein, The BGA unit is electrically connected with the inductor assembly; the bridge arm unit, the inductor assembly and the BGA unit are arranged in a vertical stacking manner.

48. The voltage regulating device of claim 47, wherein, The first circuit substrate and the second circuit substrate both comprise opposite upper surfaces and lower surfaces; the bridge arm unit is arranged on the upper surface of the first circuit substrate, the inductor assembly is arranged between the upper surfaces of the first circuit substrate and the second circuit substrate, and the bridge arm unit and the inductor assembly are electrically connected through the first circuit substrate; the BGA unit is arranged on the lower surface of the second circuit substrate, and the inductor assembly and the BGA unit are electrically connected through the second circuit substrate; The Vin+ electrical connector, the GND electrical connector and the Sig electrical connector are arranged between the first circuit substrate and the second circuit substrate, and are used for transmitting power and signals between the first circuit substrate and the second circuit substrate; the Vin+ electrical connector is arranged adjacent to four corners of the region where the BGA unit is arranged; each Vin+ electrical connector is adjacent to one GND electrical connector; The Vin+ unit is arranged on the lower surface of the second circuit substrate, and the projection of each Vin+ electrical connector on the lower surface of the second circuit substrate at least partially overlaps the Vin+ unit.

49. The voltage regulating device of claim 46, wherein, Each of the switch bridge arms comprises a pin Sig, the pin Sig and the pin SW are arranged on opposite sides of each switch bridge arm, the pins Sig of the first switch bridge arm and the third switch bridge arm are arranged adjacently and are both in the vertical projection plane, and the pins Sig of the second switch bridge arm and the fourth switch bridge arm are both arranged outside the vertical projection plane.

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