CN216212674U

CN216212674U - High-reliability chip type winding inductor

Info

Publication number: CN216212674U
Application number: CN202122436107.9U
Authority: CN
Inventors: 潘辉; 王勇; 肖松
Original assignee: Guiyang Sunlord Xunda Electronic Component Co ltd
Current assignee: Guiyang Sunlord Xunda Electronic Component Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-04-05
Anticipated expiration: 2031-10-11

Abstract

The utility model discloses a high-reliability chip type wound inductor which comprises a ceramic core of a ceramic body, a winding and a shell, wherein the ceramic core of the ceramic body is of an H-shaped structure, the winding is wound on the ceramic core of the ceramic body to form a magnetic core winding, the magnetic core winding is arranged in the shell and is plastically packaged by adopting plastic sealant, two free ends of the winding are connected to two platforms which protrude upwards at two ends of the ceramic core of the ceramic body, one platform I at the joint of the two free ends of the winding is positioned at the bottom of the shell, and the two platforms II which protrude downwards at two ends of the ceramic core of the ceramic body are respectively and electrically connected with the one platforms I. According to the utility model, the ceramic core structure of the chip winding inductor is changed, the welding position of the free end of the winding is changed to the boss at the inner end of the magnetic core, and the winding is covered inside by the shell, so that the connection stability and reliability of the free end of the winding are better protected, and the connection is carried out by adopting the communicated external boss, so that the possibility of welding spot disconnection is effectively avoided, the connection is convenient and stable, and the product reliability is improved.

Description

High-reliability chip type winding inductor

Technical Field

The utility model relates to a high-reliability chip winding inductor, and belongs to the technical field of inductors.

Background

The inductor is used as a magnetic component and plays important functions in various electronic circuits, such as energy storage, filtering, resonance, impedance matching, oscillation, coupling and the like, and key indexes of the inductor comprise inductance, a Q value and direct-current resistance. Because the winding of piece formula wire winding inductor is that the enameled wire is around ceramic core coiling, two ends of winding spot welding respectively on the electrode face at ceramic core both ends, because piece formula wire winding inductor adopts flip-chip welding when in actual use, and when measuring the characteristic of inductor, the test fixture that the solder joint needs the contact, tweezers, it causes the inductor to open a way to hinder the solder joint easily, owing to need dip-coating three proofings lacquer even after the inductor welds on the circuit board, three proofings lacquer is because dip in the inductor bottom and forms tension around the solder joint, force the disconnection of solder joint root, product reliability is poor. For years, the open root of the chip type wire-wound inductor is a design defect of the product, which leads to the complaint of customers for a long time, and the product has high use risk, therefore, the problem of solving the problem of the chip type wire-wound inductor from the structural design is needed.

The chip type wire winding inductor adopts the flip-chip welding structural design at present, namely after winding a winding on a ceramic core, the end of a wire at two ends of the winding is welded on electrode surfaces at the bottoms of two ends of the ceramic core in a spot welding mode, then a five-surface plastic package mode is adopted to package a small part of coils at the bottom by UV epoxy resin, and no effect is achieved on the coils and leads of welding point accessories. Often near the solder joint, chip-type wire-wound inductors are subject to damage for various reasons. For example, during testing, the solder joint moves back and forth on an uneven test fixture, thereby damaging the solder joint and causing an open circuit at the solder joint root. For example, after the U-shaped opening between the two bonding pads of the inductor is immersed in three-proofing paint, the three-proofing paint wraps the lead, the wire diameter used by the miniaturized inductor is very small, when the performance of the three-proofing paint is changed, the stress of the three-proofing paint continuously acts on the lead, and the lead is finally disconnected from the root of the welding spot due to mechanical fatigue to form an open circuit.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the high-reliability chip winding inductor solves the problems in the prior art by changing the ceramic core structure, the welding part and the shell with protection.

The technical scheme adopted by the utility model is as follows: the utility model provides a high-reliability chip wire winding inductor, includes ceramic body porcelain core, winding and shell, ceramic body porcelain core is H type structure, the winding constitutes the magnetic core winding on ceramic body porcelain core, adopt the plastic envelope in the shell is arranged in to the magnetic core winding, two free ends of winding are connected to on two platforms one of the both ends of ceramic body porcelain core make progress convex, two platforms one of two free end junctions of winding are located the shell bottom, two platforms two of the both ends of ceramic body porcelain core convex downwards are connected with two platforms one electricity respectively.

Preferably, the second platform and the first platform are both provided with gold-plated or tin-plated electrode surface layers, and the second platform and the first platform at the same end are electrically connected through the ceramic core end surface electroplated layer of the ceramic body.

The utility model has the beneficial effects that: compared with the prior art, the utility model has the advantages that the ceramic core structure of the chip winding inductor is changed, the welding part of the free end of the winding is changed to the lug boss at the inner end of the magnetic core, the welding part is covered inside the magnetic core by the shell, the connection stability and reliability of the free end of the winding are better protected, the connection is carried out by the communicated outer lug bosses, the possibility of disconnection of welding spots is effectively avoided, the connection is convenient and stable, and the product reliability is improved.

Drawings

FIG. 1 is a schematic perspective view of a porcelain core winding;

fig. 2 is a schematic perspective view of a radio frequency wound inductor.

Detailed Description

The utility model is further described with reference to the accompanying drawings and specific embodiments.

Example 1: as shown in fig. 1-2, a high-reliability chip type wire-wound inductor comprises a ceramic core 1 of a ceramic body, a winding 2 and a shell 3, wherein the ceramic core 1 of the ceramic body is of an H-shaped structure, the winding 2 is wound on the ceramic core 1 of the ceramic body to form a magnetic core winding, the magnetic core winding is arranged in the shell 3 and is plastically packaged by plastic sealant, two free ends of the winding 2 are connected to two platforms I5 protruding upwards from two ends of the ceramic core 1 of the ceramic body, two platforms I5 at the connection position of the two free ends of the winding 2 are positioned at the bottom of the shell 3, and two platforms II 6 protruding downwards from two ends of the ceramic core 1 are respectively and electrically connected with the two platforms I5; the second platform 6 and the first platform 5 are both provided with gold-plated or tin-plated electrode surface layers 4, the second platform 6 and the first platform 5 at the same end are electrically connected through electroplated layers on the end faces of ceramic bodies and ceramic cores 1, and the ceramic bodies and the ceramic cores are made of 96% -97% of AL₂O₃It can be made into H-shaped structure. The winding is formed by winding an enameled round copper wire, the winding is wound on the central framework, and two ends of the winding are welded on the electrode surface at the top in a spot welding mode. The formed wire-wound welding product is covered by a shell made of ceramics or thermosetting plastics, the bottom of the shell and the bottom electrode surface on the ceramic core of the ceramic body form a height difference of 0.1mm, and the electrode surface is higher than the bottom of the shell. The winding welding product and the shell can be bonded and fixed by adopting epoxy resin or silicon rubber with extremely low expansion coefficient.

Example 2: a method for manufacturing a high-reliability chip winding inductor comprises the following steps:

(1) the wound inductor has a ceramic core of ceramic body with 96% of Al as main component₂O₃The porcelain core is designed into an H-shaped structure, the middle part is a winding area, and both ends are provided with flange surfaces reserved for metallization;

(2) end face electrodes are formed on the flange surfaces at the two ends of the ceramic core, a chemical electroplated layer is 6 microns thick with Mo-Mn, then a Ni layer is plated for 2 microns, a gold plated layer or a tin plated layer is arranged on the outermost layer of the electroplated layer, the thickness is not less than 4 microns, and the end face electrodes enable the winding inductor to be an electronic element capable of being installed on the surface and are also used for being connected with a winding of the winding inductor;

(3) winding an enameled round copper wire around the center notch of the ceramic core to form a winding, wherein two wire ends of the winding are respectively connected to end face electrodes on the same side of the two ends of the ceramic core, and the wire ends and the end face electrodes are connected and welded in a hot-press welding mode at the welding temperature of 450-550 ℃;

(4) preparing a plastic shell, wherein the shell is made of liquid crystal high polymer and is molded by adopting a traditional injection molding process to form a cap structure, and the outer surface of the shell is flat and used for meeting the mounting requirements of mounting equipment;

(5) thermosetting epoxy resin or silicone adhesive liquid is added to the inner point of the plastic shell cap, the amount of the liquid is 1/5 of the depth of the plastic shell, and the linear expansion coefficient of the epoxy resin is not more than 100 units;

(6) enabling the welding surface of the winding inductor to face the inside of the plastic shell, placing the winding inductor into the plastic shell, discharging air of glue in vacuum, and heating and curing at the temperature of 130-180 ℃ for 60-120 min to completely cure the glue; or using UV epoxy resin to be dotted in the plastic shell cap, using UV-5000-6 epoxy resin as the UV epoxy resin, and adopting a UV lamp with 5A current to irradiate for 1 s-2 s until the UV epoxy resin is cured.

The welding spot formed by welding is completely wrapped in the plastic shell, so that an open circuit caused by damage to the welding spot in the use process of the winding inductor is avoided, and the winding inductor is completely wrapped by the plastic shell, so that the reliability of the winding inductor is improved.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.

Claims

1. A high-reliability chip winding inductor is characterized in that: including ceramic body porcelain core (1), winding (2) and shell (3), ceramic body porcelain core (1) is H type structure, winding (2) winding constitutes the magnetic core winding on ceramic body porcelain core (1), the magnetic core winding adopts the plastic envelope to seal in arranging shell (3) in, winding (2) two free ends are connected to on two platforms one (5) of the both ends of ceramic body porcelain core (1) convex upwards, two platforms one (5) of winding (2) two free end junctions are located shell (3) bottom, two platforms two (6) of the both ends downwardly convex of ceramic body porcelain core (1) are connected with two platforms one (5) electricity respectively.

2. The high-reliability chip winding inductor according to claim 1, wherein: the second platform (6) and the first platform (5) are both provided with gold-plated or tin-plated electrode surface layers (4), and the second platform (6) and the first platform (5) at the same end are electrically connected through the electroplated layers on the end surfaces of the ceramic cores (1) of the ceramic bodies.