TLVR coupling inductor with multiple groups of primary stages in secondary stage
By designing a TLVR coupled inductor with multiple primary windings in the secondary winding and optimizing the nesting structure of the magnetic core and coil, the problems of space occupation and electromagnetic interference of TLVR inductors in high-density PCBs were solved, and the high coupling performance and withstand voltage performance were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-03-27
AI Technical Summary
In high-density PCBs, the existing TLVR inductor structure design makes it difficult to achieve multi-group integration and coupling coefficient optimization within a limited space, resulting in components occupying a large space and being susceptible to electromagnetic interference.
The TLVR coupled inductor with multiple primary coils in the secondary coil is used. The prefabricated secondary coil and multiple primary coils are assembled with a serrated magnetic core. The nesting structure of the magnetic core and coils is optimized. The protrusions and sidewalls of the serrated magnetic core are used to achieve reliable isolation and high coupling performance of the coils.
It reduces the space occupied by inductors in high-density PCBs, reduces electromagnetic interference, improves the withstand voltage performance between coils and the performance of devices, makes the coupling coefficient of a single TLVR greater than 0.93, and the coupling coefficient between groups less than 0.1, thus optimizing the circuit operating environment.
Smart Images
Figure CN224052993U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an inductive device, especially to a TLVR coupling inductor with multiple primary windings in one secondary winding, and belongs to the technical field of basic electronic components. BACKGROUND
[0002] Inductors are the most commonly used components in electronic devices, and are widely used in various circuits to achieve filtering, energy storage, matching, and resonance functions. With the increasing miniaturization and high-density packaging of electronic products, inductors have developed rapidly. In addition, considering electromagnetic compatibility, the anti-electromagnetic interference capability of electronic products has become a basic design requirement, which has increased the demand and application of inductors.
[0003] TLVR (Trans-Inductor Voltage Regulator) architecture is a rising VR (Voltage Regulator) power supply architecture. The biggest difference between it and traditional DC to DC Buck and DC architectures is that the traditional single-winding ordinary inductor is improved to a TLVR inductor with double windings similar to a transformer. The ordinary inductor has only one winding with two pins, while the TLVR coupling inductor with multiple integrated windings has more pins. There is a big difference in structure between the two.
[0004] Currently, in the industry, when designing the structure of TLVR inductors, in addition to the main goal of coupling efficiency between two windings, the number of components and the occupied space in high-density PCBs are also important concerns. Therefore, the integration of multiple TLVR inductors in limited space and the optimization of coupling coefficients have become a technical gap that needs to be filled in the industry. SUMMARY
[0005] The utility model aims to provide a TLVR coupling inductor with multiple primary windings in one secondary winding to improve the performance of inductive devices and optimize the occupied space of components in high-density PCBs.
[0006] The technical solution for realizing the above object is: a TLVR coupling inductor with multiple primary coils and one secondary coil, which is assembled by a prefabricated secondary coil, two or more primary coils and a pair of scale tooth type magnetic cores with the same shape, wherein the scale tooth type magnetic core body is shaped as a block, one side surface is flat, and the other side surface is provided with a plurality of parallel and spaced protrusions, the primary coil is sleeved on the protrusions on the inner side in a side-by-side manner, the secondary coil is attached between the two protrusions on the outermost side and wraps all the primary coils, the two scale tooth type magnetic cores are integrally bonded in the same direction with the protrusions opposite to each other, and all the primary coils and the secondary coil are shaped as a plurality of misaligned electrode pads on one side surface of the assembly.
[0007] Further, the outermost protrusions of the scale tooth type magnetic core are a pair of side walls, the top of the side wall is flush with the top surface of the magnetic core, the bottom of the side wall is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the secondary coil, the protrusions on the inner side of the scale tooth type magnetic core are arranged at equal intervals, and the top is recessed from the top surface of the magnetic core by a distance greater than the sum of the thicknesses of the two primary coils, and the bottom is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the primary coil.
[0008] Further, the side wall and the protrusions on the inner side are flush with the end face and are distributed by dispensing, and in the spliced state of the pair of scale tooth type magnetic cores, the side wall and the side wall are spliced into a complete side wall, and the protrusions on the inner side are spliced into a coil inner core in a matched manner.
[0009] Further, the scale tooth type magnetic core is a cold-pressed forming body based on a customized mold.
[0010] Further, the secondary coil is a flat copper sheet coated with insulating paint, which is cut and continuously bent into a wide-bottom U-shaped embedded assembly, the inner width of the secondary coil is greater than the sum of the outer widths of the plurality of primary coils compatible therewith, and the two ends of the secondary coil are outwardly bent and correspondingly compatible with the bottom sides of the outermost protrusions.
[0011] Further, the primary coil is a flat copper strip cut and continuously bent into a U-shaped embedded assembly, and the surface of the primary coil is sprayed with an epoxy resin insulating layer, the inner width of the primary coil corresponds to the protrusions on the inner side, and the two ends of the primary coil are oppositely bent into an open shape and compatible with the bottom sides of the corresponding protrusions.
[0012] Further, the bent sections of the two ends of the secondary coil and the primary coil are respectively narrowed, and the narrowing directions of the two ends of each coil are opposite.
[0013] Compared with the prior art, the inductor has the advantages that: the optimized magnetic core and the one-to-many nested prefabricated shape between the two-stage coils improve the assembly structure, which helps to reduce the space occupied by the inductor in the high-density PCB and the interference influence on the periphery, on the other hand, the groups of coils and the two-stage coils in each group are reliably isolated, which improves the withstand voltage between the two-stage coils and the performance of the device, at the same time, the coupling coefficient of the single TLVR is greater than 0.93, and the coupling coefficient k between the groups of TLVRs is less than 0.1. Further improve the running environment of the circuit, and promote the development of hardware performance in the application scenarios such as servers / data centers. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a close-up structure schematic view of the scale tooth type magnetic core in the preferred embodiment of the inductor of the utility model.
[0015] Figure 2 is a close-up structure schematic view of the secondary coil in the preferred embodiment of the inductor of the utility model.
[0016] Figure 3 is a close-up structure schematic view of the primary coil in the preferred embodiment of the inductor of the utility model.
[0017] Figure 4 is an appearance evolution schematic view of the assembly and manufacturing of the preferred embodiment of the inductor of the utility model. DETAILED DESCRIPTION
[0018] In order to enable personnel in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
[0019] The utility model discloses a kind of TLVR coupling inductors of secondary common multiple primary, dedicated to improve inductor performance and optimize the space occupied by component in high-density PCB. As shown in Figures 1 to 4 The basic structure of the inductor is formed by assembling one secondary coil 2, two or more primary coils 3 and a pair of scale tooth type magnetic cores 1 of the same shape. In summary, Figure 1The scale tooth type magnetic core 1 body is shaped as a square, and can be slightly rectangular according to the number of built-in primary coils. One side surface 11 of the scale tooth type magnetic core is flat, and the other side surface is provided with a plurality of parallel and spaced protrusions; including the outermost two protrusions and the inner protrusion 14, and the container groove 13 shaped for two-stage coil embedding therebetween. The primary coil 3 is sleeved on the inner protrusion 14 in a one-to-one manner in a side-by-side manner, and the secondary coil 2 is attached between the outermost two protrusions and wraps all the primary coils 3. The two scale tooth type magnetic cores are integrally bonded in the direction of the protrusions opposite to each other. As the basis for the inductor to be connected to the PCB, all the primary coils and the secondary coil are shaped as a plurality of misaligned electrode pads on one side surface (the bottom side shown in the figure) of the combination, and the specific distribution shape will be described in detail below.
[0020] For the design consideration of multiple groups integrated and batch production, the scale tooth type magnetic core and the two-stage coil described above can be batch prefabricated and reused. Based on the summary of the technical solution and the preferred embodiment shown in the figure, the details of the features of each functional component of the inductor also include: Figure 1 The outermost protrusions of the scale tooth type magnetic core are a pair of side walls 12, and the top of the side wall 12 is flush with the top surface of the magnetic core, and the bottom of the side wall is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the secondary coil, so that the bent sections at both ends of the secondary coil are compatible and shaped as the secondary electrode pads of the inductor. The inner protrusions of the scale tooth type magnetic core are arranged at equal intervals (slightly more than twice the thickness of the primary coil) between them, and the top of the inner protrusion is recessed from the top surface of the magnetic core by a distance greater than the sum of the thicknesses of the two-stage coil, that is, it meets the requirement that the primary coil is wrapped around the protrusion first and then wrapped by the secondary coil as a whole, and the top of the secondary coil is approximately flush with the top surface of the magnetic core. In addition, the bottom of the inner protrusion is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the primary coil, that is, it meets the requirement that the primary coil is wrapped and leaves enough space for the electrode pads shaped by the bent ends. For example Figure 4 As shown from the product assembly point of view, the end surface of the side wall 12 and the inner protrusion 14 is flush and distributed point glue 5, so that the side wall is integrally formed by the side wall and the side wall in the split state of a pair of scale tooth type magnetic cores, and the inner protrusion is split into a coil core in position.
[0021] The scale tooth type magnetic core of the above-mentioned preferred embodiment structure is an assembly obtained by prefabrication based on powder material and customized mold, and the cold pressing forming process is specifically used. The scale tooth type magnetic core can be a magnetic core made of manganese-zinc ferrite material, which has a working frequency of up to 3MHz and lower core loss; or it can be made of one or more than two kinds of mixture of Fe-based / FeSiCr / FeSiAl / FeNi / FeSi / amorphous / nanocrystalline, and one of epoxy resin, silicone resin or acrylic resin is stirred uniformly and then injected into the customized mold shaped according to the device shape for cold pressing forming.
[0022] For example Figure 2As shown, the secondary coil 2 is a flat copper sheet coated with insulating paint, cut and continuously bent into a wide-bottom U-shaped embedded assembly. The inner width D1 of the secondary coil 2 is greater than the sum of the outer widths of several primary coils compatible therewith, and the two ends 21, 22 of the secondary coil 2 are bent outward and correspond to the bottom side of the edge wall 12. As shown, Figure 3 As shown, the primary coil 3 is a flat copper strip (thickness slightly greater than the secondary coil) cut and continuously bent into a U-shaped embedded assembly, and the surface of the primary coil is sprayed with an epoxy resin insulating layer. The inner width of the primary coil corresponds to the wrapping of the inner side of the protrusion 14, and its two ends 31, 32 are oppositely bent into an open shape and compatible with the bottom side of the corresponding protrusion. As shown, the bent sections of the two ends of the secondary coil and the primary coil are narrowed, and the narrowing directions of the two ends of each coil are opposite; all electrode pads of the finished product are distributed as shown Figure 4 on the bottom side, in double-row distribution and with sufficient spacing between the welding points.
[0023] On the basis of bidirectional limiting of the magnetic core top surface and bottom surface in the above-mentioned combination, the two-stage coils are assembled in place according to their respective assembly positions. In the case of a pair of scale tooth type magnetic cores being pasted and fastened, the two-stage coils are clamped and fixed, and the insulating gap between the primary and secondary coils is close to zero, which is beneficial to improve the coupling performance of a single TLVR (coupling coefficient k greater than 0.93), while the coupling coefficient k between each group does not exceed 0.1.
[0024] As shown in Figure 4 From the complete process diagram of the preferred embodiment (three groups) of the inductor, a secondary coil, three primary coils and a pair of scale tooth type magnetic cores of the same shape are first prepared. Then, one of the scale tooth type magnetic cores 1a is selected as the assembly base, and the three primary coils 3 are successively and oppositely fitted on the inner side of the protrusion 14 with the opening downward, and then the secondary coil 2 is wrapped around the outer side of all the primary coils 3 and falls into the container groove 13 (i.e. between the two edge walls) to obtain the primary assembly body 4. Then, the edge wall 12 and the end surface of the inner side of the protrusion 14 are distributedly glued, and the other scale tooth type magnetic core is pressed and combined with the scale tooth type magnetic core 1a of the assembly base in the direction opposite to the protrusion, and the finished product can be discharged into the detection process after the adhesive is cured. The electrode pads can be selectively treated by local paint stripping and electroplating or only paint stripping.
[0025] Compared with the prior art, the technical effects are as follows: through optimizing the one-to-many nested prefabricated shape between the magnetic core and the two-stage coils, the assembly structure is improved, which helps to reduce the space occupied by the inductance in the high-density PCB and the interference influence on the periphery, on the other hand, the groups of coils and the two-stage coils in each group are reliably isolated, the withstand voltage between the two-stage coils and the device performance are improved, at the same time, the coupling coefficient of a single TLVR is greater than 0.93, and the coupling coefficient k between the groups of TLVRs is less than 0.1. The operation environment of the circuit is further improved, and the hardware performance development in the application scenarios such as servers / data centers is promoted.
[0026] The preferred embodiments of the present application are described above only and are not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the principles of the present application shall be included in the protection scope of the present application.
Claims
1. A TLVR coupled inductor of secondary co-multiple of primary, characterized by: The inductor is assembled by one pre-prepared secondary coil, more than two primary coils and a pair of same-shaped scale teeth type magnetic cores, the scale teeth type magnetic core body is shaped as a square block, one side surface is flat, and the other side surface is provided with a plurality of parallel spaced convex portions, the primary coils are sleeved on the inner side convex portions in a side-by-side manner, the secondary coil is sleeved between the outermost two convex portions and wraps all the primary coils, and the two scale teeth type magnetic cores are integrally bonded in the direction of the opposite convex portions.
2. The multiple primary to multiple secondary to multiple primary TLVR coupled inductor of claim 1, wherein: The outermost convex portion of the scale teeth type magnetic core is a pair of side walls, the top of the side wall is flush with the top surface of the magnetic core, and the bottom of the side wall is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the secondary coil; the inner side convex portions are arranged at equal intervals, and the top is recessed from the top surface of the magnetic core by a distance greater than the sum of the thicknesses of the two levels of coils, and the bottom is recessed from the bottom surface of the magnetic core by a distance greater than the thickness of the primary coil.
3. The multiple primary to multiple secondary to multiple primary TLVR coupled inductor of claim 2, wherein: The side wall is flush with the end surface of the inner side convex portion and is distributed by point gluing, and in the spliced state of the pair of scale teeth type magnetic cores, the side wall is spliced into a complete side wall with the side wall, and the inner side convex portions are spliced into a coil inner core in a matched manner.
4. The multiple primary to multiple secondary to multiple primary TLVR coupled inductor of claim 1, wherein: The scale teeth type magnetic core is a cold-pressed body based on a customized mold from a powder material.
5. The multiple primary to multiple secondary to multiple primary TLVR coupled inductor of claim 1, wherein: The secondary coil is a flat copper sheet coated with insulating paint, which is cut and continuously bent into a wide-bottom U-shaped embedded assembly, the inner width of the secondary coil is greater than the sum of the outer widths of the compatible primary coils, and the two ends of the secondary coil are outwardly bent and correspondingly compatible to the bottom side of the outermost convex portion.
6. The multiple primary to multiple secondary to multiple primary TLVR coupled inductor of claim 1, wherein: The primary coil is an embedded assembly cut from a flat copper strip and continuously bent into a U shape, and the surface of the primary coil is sprayed with an epoxy resin insulating layer, the inner width of the primary coil corresponds to the wrapping of the inner side convex portion, and the two ends of the primary coil are oppositely bent into an open shape and compatible to the corresponding convex portion bottom side.
7. The multiple primary coupled inductor of claim 5 or 6, wherein: The bent sections of the two ends of the secondary coil and the primary coil are respectively arranged in a narrowing manner, and the narrowing directions of the two ends of each coil are opposite.
8. A TLVR coupled inductor of secondary co-multiple of primary, characterized by: The inductor is assembled by one pre-prepared secondary coil, three primary coils and a pair of same-shaped scale teeth type magnetic cores, the scale teeth type magnetic core body is shaped as a square block, one side surface is flat, and the other side surface is provided with five parallel spaced convex portions, the primary coils are continuously bent into U-shaped embedded assemblies and the surfaces are sprayed with an epoxy resin insulating layer, the primary coils are sleeved on the inner side convex portions in a side-by-side manner, and the two ends of each primary coil are oppositely bent into an open shape and compatible to the corresponding convex portion bottom side, the secondary coil is continuously bent into a wide-bottom U-shaped embedded assembly, the secondary coil is sleeved between the outermost two convex portions and wraps all the primary coils, and the two ends of the secondary coil are outwardly bent and correspondingly compatible to the bottom side of the outermost convex portion; two scale teeth type magnetic cores are integrally bonded in the direction of the opposite convex portions, and all the primary coils and the secondary coil are formed into a plurality of staggered distribution electrode pads on one side surface of the combination.