Inductor capable of improving space utilization rate
By designing a dual magnetic path inductor and floating pin mounting, the problem of large space occupation of inductors on PCB boards was solved, achieving miniaturization and improved reliability of inductors.
Patent Information
- Application Number
- CN202520101463.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-16
AI Technical Summary
Existing surface-mount power inductors occupy a large space on the PCB board, which increases component density and can easily lead to poor soldering and overheating.
Design a dual magnetic path inductor with an inverted U-shaped electrode structure and suspended pins to increase the vertical space at the bottom of the inductor. Use electrode plates instead of enameled wire to improve the reliability and current carrying capacity of the inductor.
It effectively improves the space utilization of PCB boards, reduces component density, avoids problems such as poor soldering and excessive temperature, and realizes the miniaturization of inductors.
Smart Images
Figure CN223828316U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an inductor that improves space utilization and belongs to the field of power inductor technology. Background Technology
[0002] Power inductors can be used in power supply circuits to form a low-pass filter, reducing high-frequency signal interference and making the DC output of the circuit more stable. They can also limit current in the circuit, protecting other components from overload damage. Currently, most surface-mount power inductors on the market are designed to shrink in size, resulting in increasingly higher density of electronic components on PCBs, making it difficult to further reduce the size of inductors. The only option is to continuously widen the PCB to meet usage requirements. However, the increasing density of components on the PCB can gradually lead to unexpected problems during use (such as poor soldering and open circuits due to heat absorption between components during soldering, or overheating and burnout due to excessive PCB density).
[0003] The structure of the integrally molded power inductor product is as follows: Figure 5-7 As shown, the coil (enameled wire) is wound first, then the lead end is flattened or an external metal frame is attached, alloy powder and epoxy resin are mixed in, the magnetic powder is molded, and then the terminals are bent to form a surface mount inductor.
[0004] The integrally molded inductor comprises a magnetic core, a coil, and terminals. Enamelled wire is wound around the magnetic core to form a magnetic path. The enamelled wire magnetic path is fixed inside the magnetic body and wrapped with a molding process. The free ends of the enamelled wire are electrically connected to metal terminals, which are bent and fixed to both sides of the bottom. The inductor wire ends are soldered through the metal terminals using high-temperature tin to avoid potential problems at high temperatures, thus ensuring the product's soldering effect and high-temperature resistance, meeting the requirements for use under high-temperature conditions.
[0005] When this surface-mount integrated power inductor is installed, the PCB board space becomes increasingly larger due to the increasing number of electrical components, making it impossible to meet the requirements for product miniaturization. Summary of the Invention
[0006] The technical problem to be solved by this utility model is to provide an inductor that improves space utilization, which can effectively improve the space utilization after product installation.
[0007] The technical solution adopted by this utility model is as follows: an inductor that improves space utilization includes a magnetic core, a first end plate and a second end plate. The first end plate and the second end plate are in an inverted U-shaped structure and are symmetrically fixedly connected to the magnetic core to form two magnetic paths. The two ends of the first end plate and the second end plate are exposed on both sides of the magnetic core and the lower end protrudes from the lower surface of the magnetic core to form four pins. The magnetic core is provided with a first groove and a second groove that are symmetrically parallel to each other to form a first air gap and a second air gap. The first groove and the second groove are located in the middle of the lower part of the first end plate and the second end plate, respectively.
[0008] Furthermore, the magnetic core is provided with two through holes, and the first end pole piece and the second end pole piece are respectively bent downward through the two ends of the two through holes.
[0009] Furthermore, the bent ends of the first and second end plates are respectively bonded to the inlay grooves at both ends of the two through holes with glue.
[0010] Furthermore, the magnetic core has two inlay slots at both ends, which are opposite to each through hole. The inlay slots are engaged with the bent ends of the first or second end pole piece.
[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model increases the traditional single magnetic path to a dual magnetic path. The inductance can be changed by altering the magnetic core at the bottom of the inductor. The two magnetic paths are independent and do not interfere with each other. The enameled wire of the traditional inductor is replaced by electrode plates, which can withstand a larger current. At the same time, because the strength of the electrode plates is much higher than that of the metal terminals of ordinary inductors, the reliability of the inductor is improved. In order to better improve the space utilization on the PCB board, the lower end of the inductor leads protrudes from the magnetic core and is no longer bent. The inductor is installed with the leads suspended, which increases the vertical space at the bottom of the inductor. This allows for the placement of matching miniaturized products at the bottom of the inductor, thereby reducing the product density on the PCB board and improving the space utilization on the PCB board. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of an inductor;
[0013] Figure 2 This is a three-dimensional structural diagram of an inductor from another perspective;
[0014] Figure 3 This is a schematic diagram of the inductor's structure from the right side.
[0015] Figure 4 yes Figure 3 Enlarged structural diagram of section AA;
[0016] Figure 5 This is a schematic diagram of a single-channel magnetic flux circuit;
[0017] Figure 6 This is a top-view cross-sectional diagram of an existing integrated inductor;
[0018] Figure 7 This is a front cross-sectional view of an existing integrated inductor. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0020] Example 1: As Figure 1-5 As shown, an inductor for improving space utilization includes a magnetic core 1, a first terminal plate 2, and a second terminal plate 3. The first terminal plate 2 and the second terminal plate 3 have an inverted U-shaped structure and are symmetrically fixedly connected to the magnetic core 1 to form two magnetic paths. The two ends of the first terminal plate 2 and the second terminal plate 3 are exposed on both sides of the magnetic core 1, and the lower end protrudes from the lower surface of the magnetic core 1 to form four pins. The magnetic core 1 has a first groove 4 and a second groove 5 that are symmetrically parallel to each other to form a first air gap and a second air gap. The first groove 4 and the second groove 5 are located in the middle of the lower part of the first terminal plate 2 and the second terminal plate 3, respectively. The traditional single magnetic path is increased to a dual magnetic path, and the two magnetic paths can pass through... The inductance is altered by changing the magnetic core at the bottom of the inductor, with two independent magnetic paths that do not interfere with each other. The enameled wire of the traditional inductor is replaced with electrode plates, allowing it to withstand greater current. Furthermore, the electrode plates are much stronger than the metal terminals of ordinary inductors, improving the inductor's reliability. To better utilize space on the PCB, the inductor leads protrude from the magnetic core without bending. The inductor is mounted with its leads suspended, increasing the vertical space at the bottom of the inductor. This allows for the placement of smaller, complementary products, reducing product density on the PCB and improving overall PCB space utilization.
[0021] To facilitate the installation and fabrication of the first and second end plates, two through holes 6 are provided inside the magnetic core 1. The first end plate 2 and the second end plate 3 pass through the two through holes 6 and bend downwards at both ends. By setting through holes to pass through the end plates, they can be bent directly to form leads, which makes installation convenient, fabrication easy, and the bent end plates more stable.
[0022] In order to achieve a stable connection between the first end electrode 2 and the second end electrode 3, the bent ends of the first end electrode 2 and the second end electrode 3 are respectively glued to the inlay grooves at both ends of the two through holes 6. By applying glue to the front and back sides, the first end electrode 2 and the second end electrode 3 can be stably connected in the through holes.
[0023] To make the structure more compact, the magnetic core 1 has two inlay grooves 7 at both ends, which are directly opposite each through hole 6. The grooves are designed to facilitate inserting the electrode sheet into the inlay grooves, making the structure more compact.
[0024] This utility model utilizes the suspended mounting of pin-type inductors, allowing surface-mount devices to be placed in the vertical space beneath the inductor. This significantly improves the utilization of the vertical space at the bottom of the inductor, saving lateral space on the PCB for mounting electrical components and facilitating product miniaturization. The suspended mounting of power inductors effectively solves the problems caused by excessive heat absorption during component soldering on the PCB due to high component density, leading to poor soldering and open circuits, or overheating and burnout due to excessive PCB density.
[0025] Example 2: A method for manufacturing the inductor in Example 1 includes the following steps:
[0026] Step 1: The magnetic core is machined with two through holes to form two magnetic passages, and a first groove and a second groove are machined to form a first air gap and a second air gap. Inlay grooves are formed at both ends of the magnetic core by cutting to obtain the magnetic core structure.
[0027] Step 2: The first and second end plates, which are long strips, are machined to the specified dimensions by cutting, and a layer of matte tin is plated on the first and second end plates to form the first and second end plates.
[0028] Step 3: By passing the first and second end plates through the two through holes of the magnetic core, and then bending the two ends of the first and second end plates through a bending process, and cutting off the leads of the first and second end plates, the first and second end plates will form an inverted U-shape after bending.
[0029] Step 4: After bending the first and second end plates into shape, fix the end electrodes at both ends of the magnetic core with adhesive; the adhesive is applied in the groove formed by cutting. After bonding, a power inductor is obtained.
[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. An inductor for improving space utilization, characterized in that, The magnetic core (1), the first end plate (2) and the second end plate (3) are included. The first end plate (2) and the second end plate (3) are in an inverted U-shaped structure and are symmetrically fixedly connected to the magnetic core (1) to form two magnetic paths. The two ends of the first end plate (2) and the second end plate (3) are exposed on the two sides of the magnetic core (1) respectively, and the lower end protrudes from the lower surface of the magnetic core (1) to form four pins. The magnetic core (1) is provided with a first groove (4) and a second groove (5) that are symmetrically parallel to each other to form a first air gap and a second air gap. The first groove (4) and the second groove (5) are located in the middle of the lower part of the first end plate (2) and the second end plate (3) respectively.
2. The inductor for improving space utilization according to claim 1, characterized in that, The magnetic core (1) has two through holes (6), and the first end plate (2) and the second end plate (3) are bent downward through the two through holes (6) respectively.
3. An inductor for improving space utilization according to claim 2, characterized in that, The two ends of the first end electrode (2) and the second end electrode (3) are glued to the two ends of the through holes (6) respectively at the bent ends.
4. An inductor for improving space utilization according to claim 1, characterized in that, The magnetic core (1) has two inlay slots (7) at both ends, which are directly opposite each through hole (6). The inlay slots (7) are inserted into the bent end of the first end plate (2) or the second end plate (3).