Search

CN-224232464-U - Combined coupling inductor

CN224232464UCN 224232464 UCN224232464 UCN 224232464UCN-224232464-U

Abstract

The utility model discloses a combined coupling inductor, which is formed by assembling a prefabricated secondary coil, more than two primary coils and a pair of magnetic cores oppositely spliced into square blocks, wherein one side surface of at least one magnetic core is flat, the other side surface of the at least one magnetic core is provided with a plurality of parallel and spaced convex parts, the primary coils are continuously bent into a side view and a shape like a Chinese character's' shape and are sleeved on the convex parts one by one to form two non-contact side-by-side and mutually coupled primary inductors, the secondary coils wrap all the primary coils and are attached to the inner walls of the magnetic cores to form secondary inductors coupled with the primary inductors, the two magnetic cores are bonded into a whole along the same edge, and all the primary coils and the secondary coils are formed into a plurality of electrode pads distributed in a staggered manner on one side surface of the combined body. The inductor is favorable for reducing occupied space and interference influence on the periphery, has the characteristics of high coupling efficiency, good coplanarity, good size consistency and the like, and is suitable for a high-density and quick-response power supply module system.

Inventors

  • RAO JINHUO
  • LIN HUOLI
  • WANG JUNWEN
  • WEI DAWEI

Assignees

  • 三积瑞科技（苏州）有限公司

Dates

Publication Date
20260512
Application Date
20250528

Claims (8)

  1. 1. A combined coupling inductor is characterized in that the inductor is formed by assembling a prefabricated secondary coil, more than two primary coils and a pair of magnetic cores which are oppositely spliced into square blocks, one side surface of at least one magnetic core is flat, the other side surface of the at least one magnetic core is provided with a plurality of parallel and spaced convex parts, the primary coils are continuously bent into a side view shape and are sleeved on the convex parts one by one to form two non-contact side-by-side and mutually coupled primary inductors, the secondary coils wrap all the primary coils and are attached to the inner walls of the magnetic cores to form secondary inductors coupled with the primary inductors, the two magnetic cores are integrally bonded together, and all the primary coils and the secondary coils are formed into a plurality of electrode pads distributed in a staggered mode on one side surface of the combined body.
  2. 2. The combined type coupled inductor according to claim 1, wherein the magnetic cores are formed into a pair of the same shape, one of the magnetic cores is provided with a pair of side walls which sandwich the protruding portions, the protruding portions are arranged at equal intervals, the top of each protruding portion is retracted by a distance larger than the sum of the thicknesses of the two stages of coils relative to the top surface of the magnetic core, the bottom of each protruding portion is flush with the bottom surface of the magnetic core, the pair of magnetic cores are spliced into a pair of side walls by the side walls in a spliced state, and the protruding portions on the inner sides are spliced into the coil core in an aligned mode.
  3. 3. The combined type coupled inductor according to claim 1, wherein the magnetic cores are formed into a pair with the same shape, one of the magnetic cores is provided with a U-shaped convex edge which is used for clamping the convex parts, the convex parts are arranged at equal intervals, the top of each convex part is retracted by a distance larger than the sum of the thicknesses of two stages of coils relative to the inner wall of the top side of the U-shaped convex edge, the bottom of each convex part is retracted by a distance matched with the thickness of the secondary coil relative to the end face of the bottom side of the U-shaped convex edge, the U-shaped convex edge is spliced into a top wall and a pair of side walls in the spliced state of the magnetic cores, and the convex parts on the inner side are aligned and spliced into the coil inner core.
  4. 4. The combined type coupled inductor according to claim 1, wherein the magnetic cores are formed into a pair of split-type magnetic cores with different shapes and edges, the first magnetic core is a square sheet body, the second magnetic core is a square body with two open sides and is wrapped by convex parts which are arranged side by side at equal intervals, the gap between the top of each convex part and the inner wall of the top side of the second magnetic core is larger than the sum of the thicknesses of the two stages of coils, the bottom of each convex part is retracted to a distance which matches the thickness of the secondary coil relative to the bottom surface of the second magnetic core, and the first magnetic core is split into a whole by being aligned with the edges and attached to the second magnetic core.
  5. 5. The combined type coupled inductor of claim 1, wherein the primary coil is an embedded fitting formed by cutting and continuously bending a flat copper strip, an epoxy resin insulating layer is sprayed on the surface of the primary coil, the width of the flat copper strip is smaller than the length of the protruding part after the split forming, and two ends of the flat copper strip are bent downwards from the top side of the protruding part and extend obliquely towards the adjacent magnetic core in different directions until the bottom side of the protruding part is relatively bent to wrap the protruding part.
  6. 6. The combined type coupled inductor according to claim 1, wherein the secondary coil is an embedded fitting formed by cutting and continuously bending a flat copper sheet with an insulating enamel, the width of the flat copper sheet is consistent with the length of the raised part after the splicing and forming, the inner width of the secondary coil is larger than the sum of the outer widths of a plurality of primary coils compatible with the secondary coil, and two ends of the secondary coil are outwards bent and are attached to the bottom side of the magnetic core.
  7. 7. The combined type coupled inductor according to claim 1, wherein the magnetic core is provided with three parallel and spaced apart protrusions, each protrusion is sleeved with a primary coil, and the secondary coil surrounds all primary coils and is abutted against the inner wall of the magnetic core.
  8. 8. The combined type coupled inductor according to claim 1, wherein the magnetic core is a cold-pressed molded body made of powder based on a custom mold, and the two magnetic cores in pairs and the protruding portions thereof are distributed, dispensed, split and cold-pressed integrally molded or directly split and hot-pressed molded.

Description

Combined coupling inductor Technical Field The utility model relates to an inductance device, in particular to a TLVR-framework combined coupling inductor, and belongs to the technical field of basic electronic components. Background The inductor is a component most commonly used in electronic equipment, is widely used in various circuits, and can achieve the functions of filtering, energy storage, matching and resonance. The inductor assembly can be rapidly developed under the conditions of miniaturization and portability of electronic products and high-density assembly, and the electromagnetic interference resistance of the electronic products becomes a basic design requirement under the consideration of electromagnetic compatibility, thereby aggravating the inductor requirement and application. With the increasing requirements of AI servers, high-speed operators, and other edge devices on power supply stability and dynamic response speed, conventional multiphase power supplies face challenges of space limitation and functional density. In order to solve the problems of switching loss and output filter size under high-frequency load, the TLVR architecture is gradually popularized and applied in the industry so as to improve the transient response in a form of coupling inductance series connection cross-phase. However, most of inductors of the multi-phase TLVR-structure circuit used in the prior art are designed by assembling a primary coil, a secondary coil and a magnetic core into a single-phase structure, and have the problems of complex structure, unstable coupling coefficient, large occupied design space and the like. And the consistency of the finished product and the defects of the automatic manufacturing process are various. Therefore, the integration of TLVR inductors in a limited space and the optimization of coupling coefficients become a technical gap to be filled in the industry. Disclosure of Invention The utility model aims to provide a combined coupling inductor which aims at improving the performance of an inductance device and optimizing the occupation space of components in a high-density PCB. The combined type coupling inductor is characterized by being formed by assembling more than two primary coils and a pair of magnetic cores oppositely spliced into a square block, wherein one side surface of at least one magnetic core is flat, a plurality of parallel and spaced protruding parts are arranged on the other side surface of the at least one magnetic core, the primary coils are continuously bent into a side view shape and are sleeved on the protruding parts one by one to form two non-contact side-by-side and mutually coupled primary inductors, the secondary coils are wrapped around all the primary coils and are attached to the inner walls of the magnetic cores to form secondary inductors coupled with the primary inductors, the two magnetic cores are bonded into a whole in an aligning way, and all the primary coils and the secondary coils are formed into a plurality of electrode pads distributed in a staggered way on one side surface of the combined body. Further, the magnetic cores are formed into a pair with the same shape, one of the magnetic cores is provided with a pair of side walls which are used for clamping the protruding parts, the protruding parts are arranged at equal intervals, the top parts of the protruding parts are retracted for a distance larger than the sum of the thicknesses of the two stages of coils relative to the top surface of the magnetic core, the bottoms of the protruding parts are flush with the bottom surface of the magnetic core, the side walls are spliced into a pair of side walls in the split state of the magnetic core, and the protruding parts on the inner sides are aligned and spliced into the coil inner core. Further, the magnetic cores are formed into a pair with the same shape, one of the magnetic cores is provided with a U-shaped convex edge wrapping and clamping the convex parts, the convex parts are arranged at equal intervals in pairs, the top side inner wall of the top part of each convex part relative to the U-shaped convex edge is retracted by a distance larger than the sum of the thicknesses of the two stages of coils, the bottom side end surface of the bottom part of each convex part relative to the U-shaped convex edge is retracted by a distance matching the thickness of the secondary coil, the U-shaped convex edge is spliced into a top wall and a pair of side walls in a magnetic core splicing state, and the convex parts on the inner sides are aligned and spliced into the coil inner core. Further, the magnetic cores are formed into a pair of split cores with different shapes and aligned edges, wherein the first magnetic core is a square sheet body, the second magnetic core is a square sheet body with two open sides and wraps the protruding parts which are arranged side by side at equal intervals, the gap between the top of the protruding par