Integrated double inductor
Through the integrated dual inductor design, the shape of the core and coil is optimized, and the hot-pressure package and electrode pad production, the problem of large space and insufficient performance of inductor devices in high-density PCB is solved, efficient inductance integration is achieved, and the performance of inductor devices and the operating environment of the circuit is improved.
Patent Information
- Application Number
- CN202422149293.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In high-density PCBs, inductor devices occupy a large space and lack performance, especially in DC-DC Converter Buck circuits, which affects the conversion efficiency of electronic devices.
Adopting an integrated dual inductor design, the shape of the core and coil is optimized through the combination of preformed cup core, I-bar core and U-shaped coil, and high-density integration of inductor devices is achieved through hot-pressure packaging and electrode pad production.
It reduces the space occupied by inductors in high-density PCBs, improves the performance of inductor devices, makes the mutual coupling coefficient k < 0.1 inside the inductor devices improves the operating environment of the circuit, and promotes the development of hardware performance in application scenarios such as artificial intelligence, data centers and autonomous driving.
Smart Images
Figure CN223038757U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an inductor device, in particular to an integrated dual inductor for optimizing the occupied space of inductance elements and improving the device performance in a high-density PCB, belonging to the technical field of basic electronic components. Background Technique
[0002] Inductance is one of the most commonly used components in electronic devices and is widely used in various circuits, achieving functions such as filtering, energy storage, matching, and resonance. With the increasing miniaturization, portability, and high-density assembly of electronic products, inductance components have developed rapidly; and considering electromagnetic compatibility, the anti-electromagnetic interference ability of electronic products has become a basic design requirement, thus increasing the demand and application of inductance.
[0003] Inductor devices are widely used in DC-DC Converter Buck circuits and play a crucial role in the conversion efficiency of this circuit, restricting the development of big data processing hardware devices to a certain extent. Currently, the design and actual products of integrating dual inductors into a single component have been widely seen in the market. However, due to the variability of each application circuit design, people often hope that each inductor integrated into one body can operate independently to achieve the required functions with the lowest mutual interference, so higher requirements are put forward for the structural design of the integrated dual inductors. Summary of the Invention
[0004] The purpose of the utility model is to propose an integrated dual inductor with optimized structure, aiming to improve the performance of inductor devices and reduce the coupling coefficient.
[0005] The technical solution for the utility model to achieve the above purpose is: an integrated dual inductor, where the inductor is formed by combining a preformed cup-shaped magnetic core, an I-shaped magnetic core, and two groups of U-shaped coils. The cup-shaped magnetic core is a block container with an open top surface. There are two parallel and spaced receiving grooves in the cavity of the cup-shaped magnetic core. The U-shaped coil is formed by bending a copper strip and its two ends are lapped on the eaves of the cup-shaped magnetic core. The I-shaped magnetic core is filled in the cavity of the cup-shaped magnetic core and presses the U-shaped coil into the receiving groove. The two parts of the magnetic core are hot-pressed and encapsulated into one body, and electrode pads are provided corresponding to the ends of the U-shaped coil.
[0006] Further, there is an isolation boss with an increased wall thickness between the two receiving grooves of the cup-shaped magnetic core, and the inner wall spacing and depth of the isolation boss match the installation and compatibility of the I-shaped magnetic core.
[0007] Further, the cup-shaped magnetic core and the I-shaped magnetic core are cold-pressed formed bodies made of powder materials based on customized molds.
[0008] Furthermore, the U-shaped coil is a batch prefabricated part that is continuously bent and cut. The U-shaped coil is provided with a horizontal base that fits the bottom of the accommodating groove, vertical arms that are bent upward from both ends of the horizontal base, and a pin that is bent outward from the top of the vertical arm. The pin is aligned and compatible with the eaves of the cup-type magnetic core.
[0009] Furthermore, a spray paint layer is provided on the surface of the semi-finished product of the hot pressing package, and an electrode pad obtained by paint stripping and electroplating is provided at the end position corresponding to the U-shaped coil.
[0010] Compared with the prior art, the advantages of the integrated dual inductor of the utility model are as follows: by disassembling the inductor structure and optimizing the shape of the prefabricated magnetic core and the matching coil, it helps to reduce the space occupied by the components of the inductor in the high-density PCB, and at the same time improves the performance of the inductor device, so that the mutual coupling coefficient k inside the inductor device is less than 0.1. It further improves the operating environment of the circuit and promotes the development of hardware performance in application scenarios such as artificial intelligence AI servers / data centers / autonomous driving, and smart city transportation. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the assembly structure of the integrated dual inductor of the utility model.
[0012] Figure 2 yes Figure 1 Close-up of the cup core structure in the inductor shown.
[0013] Figure 3 yes Figure 1 Schematic diagram of the forming structure of the U-shaped coil in the inductor shown. DETAILED DESCRIPTION
[0014] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0015] The utility model proposes an integrated dual inductor. Figures 1 to 3As shown in the figure, the basic structure of the inductor is formed by combining a preformed cup-shaped magnetic core 1, an I-shaped magnetic core 3, and two sets of U-shaped coils 2. Looking at each functional component in detail, the cup-shaped magnetic core 1 is a block container with an open top. Inside the cavity of the cup-shaped magnetic core, there are two parallel and spaced receiving grooves 11a and 11b. The corresponding U-shaped coil 2 is formed by bending a copper strip, and its shape is suitable for being placed in the receiving groove and having both ends lapped on the eaves 13 of the cup-shaped magnetic core. Finally, the I-shaped magnetic core 3 is filled into the cavity of the cup-shaped magnetic core and presses the U-shaped coil into the receiving groove, thus eliminating the need to use additional components to fix the U-shaped coil and realizing the basic structure of the inductor with the coil wrapping the magnetic core. The two parts of the magnetic core are hot-pressed and encapsulated into one body, and the ends of the corresponding U-shaped coils are set as electrode pads after hot-pressing encapsulation, painting, paint stripping, and then electroplating.
[0016] On the basis of this prefabrication, the details of each functional component include: As Figure 2 shown in the figure, the cup-shaped magnetic core 1 is provided with an isolation boss 12 with an increased wall thickness between the two receiving grooves 11a and 11b. The inner wall spacing and depth of the isolation boss 12 match the I-shaped magnetic core 3 for assembly and compatibility. It can be understood that the isolation boss and the inner wall of the cup-shaped magnetic core enclose to form the receiving groove, and the U-shaped coil filled therein can be stably positioned. Moreover, on both sides of the cup-shaped magnetic core near the isolation boss at the top, there are eaves with slightly reduced heights, which are suitable for the two ends of the U-shaped coil to be lapped and positioned and are conducive to the production of electrode pads.
[0017] The U-shaped coil is a batch prefabricated part formed by continuously bending and cutting a copper strip. As Figure 3 shown in the figure, the U-shaped coil 2 is provided with a horizontal base 21 that fits the bottom of the receiving groove, vertical arm parts 22 that bend upward from both ends of the horizontal base, and pin parts 23 that bend outward from the top ends of the vertical arm parts. Then, when the U-shaped coil is assembled into the receiving groove, the pin parts 23 can be aligned and compatible with the eaves of the cup-shaped magnetic core. On the one hand, when the I-shaped magnetic core is assembled, a semi-enclosed coil structure is formed. On the other hand, on the bottom surface after the two magnetic cores are hot-pressed and encapsulated, the pin parts can occupy an appropriate area to facilitate the formation of electrode pads.
[0018] Looking at the further refined features and complete manufacturing process, after the cup-shaped magnetic core, U-shaped coil, and I-shaped magnetic core are assembled, they are transferred into a packaging mold and encapsulated into one body under a temperature range of 100 - 200°C and a pressure range of 4 - 12 Tons / cm². Usually, the forming time is between 30 - 180 seconds, which is adjusted according to the actual situation. After the product is demolded, it is baked in a temperature environment of 100 - 180°C for a period of time to be completely cured and shaped. Then, a full-coverage painting operation is performed on the surface of the inductor semi-finished product, followed by a laser paint stripping treatment on the position where the pin parts are located, and then an electroplating operation is performed on the pin parts with the exposed copper surface to generate clearly spaced electrode pads at the bottom of the device.
[0019] In addition, both of the above-mentioned magnetic cores are assembled parts prefabricated based on powder materials and customized molds, and the cold pressing forming process is specifically used. The powder materials used for the magnetic cores can be one or a mixture of two or more of iron powder / FeSi / FeSiCr / FeSiAl / FeNi / amorphous / nanocrystalline, and after adding resin and stirring evenly, it is injected into the prefabricated mold set according to the shape of the device. The optional forming pressure range is 6-10Tons / cm².
[0020] In summary, as detailed in the preferred embodiments of the integrated dual inductor of the present invention, compared with the prior art, it has substantial features and progressiveness, and its technical effects are as follows: By disassembling the inductor structure and optimizing the shapes of the prefabricated magnetic core and the supporting coil, it helps to reduce the space occupied by the components of the inductor in the high-density PCB, and at the same time improves the performance of the inductor device, making the mutual coupling coefficient k inside the inductor device < 0.1. Further improve the operating environment of the circuit and promote the development of the hardware performance in application scenarios such as artificial intelligence AI servers / data centers / autonomous driving / smart city transportation.
[0021] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present application shall be included in the protection scope of the present application.
Claims
1. Integrated dual inductor, characterized by: The inductor is formed by combining a preformed cup-shaped magnetic core, a magnetic core and two groups of U-shaped coils, wherein the cup-shaped magnetic core is a block container with an open top surface, and two parallel and spaced containing grooves are provided in the cavity of the cup-shaped magnetic core. The U-shaped coil is formed by bending a copper strip and its two ends are overlapped on the eaves of the cup-shaped magnetic core. The magnetic core is filled in the cavity of the cup-shaped magnetic core and the U-shaped coil is pressed into the containing groove. The two parts of the magnetic core are hot-pressed and packaged into one, and the ends corresponding to the U-shaped coils are set as electrode pads.
2. The integrated dual inductor according to claim 1, characterized in that: The cup-type magnetic core is provided with an isolation boss with increased wall thickness between two accommodating grooves, and the inner wall spacing and depth of the isolation boss match that of a magnetic core installed therein.
3. The integrated dual inductor according to claim 1, characterized in that: The cup core and the I-bar core are cold-pressed bodies made of powder material based on customized molds.
4. The integrated dual inductor according to claim 1, characterized in that: The U-shaped coil is a batch prefabricated part that is continuously bent and cut. The U-shaped coil is provided with a horizontal base that fits the bottom of the accommodating groove, vertical arms that are bent upward from both ends of the horizontal base, and pins that are bent outward from the top of the vertical arms. The pins are aligned and compatible with the eaves of the cup-type magnetic core.
5. The integrated dual inductor according to claim 1, characterized in that: The surface of the semi-finished product of the hot pressing package is provided with a spray paint layer, and an electrode pad obtained by paint stripping and electroplating is provided at the end position corresponding to the U-shaped coil.