CN115036106A

CN115036106A - Unilateral pin surrounding type magnetic core PFC inductor

Info

Publication number: CN115036106A
Application number: CN202210794903.6A
Authority: CN
Inventors: 刘华朝
Original assignee: Shenzhen Zhongzheng Magnetic Energy Technology Co ltd
Current assignee: Shenzhen Zhongzheng Magnetic Energy Technology Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-09-09

Abstract

The invention relates to the technical field of PFC (power factor correction) inductors, in particular to a single-plate pin-surrounded magnetic core PFC inductor, which comprises a winding framework, a magnetic core group and a winding wound on the winding framework, wherein the magnetic core group comprises an upper magnetic core and a lower magnetic core which are mutually spliced, and a core column arranged on the upper magnetic core and/or the lower magnetic core, the upper magnetic core comprises a top cover, the lower magnetic core comprises a bottom cover and a side wall arranged at the peripheral edge of the bottom cover, an installation cavity is formed inside the spliced upper magnetic core and the lower magnetic core, and an assembly body of the winding framework and the winding is installed in the installation cavity and is surrounded by the upper magnetic core and the lower magnetic core. According to the invention, the upper magnetic core and the lower magnetic core which are spliced with each other are arranged, and the assembly body of the winding framework and the coil is arranged in the mounting cavity formed by splicing the upper magnetic core and the lower magnetic core, so that the coil is integrally surrounded by the upper magnetic core and the lower magnetic core, the utilization rate of the magnetic cores is improved, the magnetic shielding capability is good, and the overall volume of the PFC inductor is reduced.

Description

Unilateral pin surrounding type magnetic core PFC inductor

Technical Field

The invention relates to the technical field of PFC (power factor correction) inductors, in particular to a single-side pin surrounded type magnetic core PFC inductor.

Background

The PFC inductance is an inductor for forming a PFC circuit, and can improve power factors in the circuit, reduce reactive power in the circuit and improve the power conversion effect through a circuit structure. The PFC inductor is usually manufactured by adopting a framework and a magnetic core, an enameled wire is wound outside a bobbin body of the framework to form a winding, then a wire end of a leading-out end of the enameled wire is fixed on a contact pin of the framework, and finally a cylinder body of the magnetic core is inserted into the bobbin body of the framework to enable the winding to be positioned in a shielding cover of the magnetic core.

However, most of the existing PFC inductors adopt a vertical annular magnetic core structure, which results in a high height and a large volume of a final product, and under the condition of limited installation position, the installation difficulty is increased or the installation is directly impossible.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a single-side pin surrounding type magnetic core PFC inductor which has the advantages of high magnetic core utilization rate, strong magnetic shielding function, small overall size and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a veneer pin enclosed magnetic core PFC inductance, includes bobbin, magnetic core group and twines the winding on bobbin, magnetic core group is including the last magnetic core of mutual concatenation and lower magnetic core and locate the magnetic core and/or locate down the stem on the magnetic core, it includes the top cap to go up the magnetic core, the magnetic core includes the bottom down and locates the bottom lateral wall of border department all around, go up the magnetic core and splice back internal formation installation cavity with lower magnetic core, bobbin and the assembly body of winding install in the installation cavity and by last magnetic core and lower magnetic core surround.

Further, the stem is positioned in the mounting cavity, and the stem is vertically connected to the end surface of the bottom cover and/or vertically connected to the end surface of the top cover.

Furthermore, the winding framework comprises a winding post, an upper end plate and a lower end plate, wherein the upper end plate and the lower end plate are respectively arranged at the upper end and the lower end of the winding post, and the winding is wound on the winding post.

Furthermore, a through hole penetrating through the upper end plate and the lower end plate is formed in the winding post, and the core post is inserted into the through hole.

Furthermore, the side wall of the upper end plate is connected with a wire hanging part, a pin support is arranged at the position of the lower end plate corresponding to the wire hanging part, and the outgoing line of the winding bypasses the wire hanging part and is connected to the pin support.

Furthermore, a plurality of pins are arranged at the bottom of the pin support, and all outgoing lines of the winding are connected with the pins respectively after bypassing the hanging wire part.

Furthermore, a plurality of pin holes are formed in the pin support, and all outgoing lines of the winding are connected into the pin holes after bypassing the hanging wire part.

Furthermore, the side wall is provided with an opening at the position corresponding to the pin support and the wire hanging part, and the pin support and the wire hanging part extend out of the opening.

Further, be equipped with the hanging wire barricade that surrounds hanging wire portion on the up end board terminal surface, be equipped with the support barricade that surrounds pin support on the lower end board, go up be equipped with on the magnetic core with the hanging wire breach of hanging wire barricade structure looks adaptation, be equipped with the support breach with support barricade structure looks adaptation down on the magnetic core, hanging wire barricade and hanging wire breach gomphosis, support barricade and support breach gomphosis.

Furthermore, the bottom of the lower magnetic core is provided with an insulating baffle, connecting holes are symmetrically formed in the insulating baffle at positions corresponding to the support notches, and the pins positioned on two sides of the pin support are inserted into the connecting holes.

In summary, the beneficial effects of the invention are as follows:

1. according to the invention, the upper magnetic core and the lower magnetic core which are mutually spliced are arranged, and the assembly body of the winding framework and the coil is arranged in the mounting cavity formed by splicing the upper magnetic core and the lower magnetic core, so that the coil is integrally surrounded by the upper magnetic core and the lower magnetic core, the utilization rate of the magnetic cores is improved, the magnetic shielding capability is good, and the overall volume of the PFC inductor is reduced.

2. According to the invention, the hanging wire part and the pin support are arranged on the same side, so that the distance between the incoming wire and the outgoing wire of the winding is shortened, the overall volume of the PFC inductor is further reduced, and the miniaturization design of the PFC inductor is facilitated.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is an exploded view of the first embodiment;

FIG. 3 is a schematic structural diagram according to a second embodiment;

FIG. 4 is an exploded view of the second embodiment;

FIG. 5 is a schematic structural diagram of another embodiment of the second embodiment;

FIG. 6 is an exploded view of another embodiment of the second embodiment;

fig. 7 is an exploded view of the third embodiment.

In the figure: 1. winding a bobbin; 11. a winding post; 12. an upper end plate; 121. hanging a wire and retaining walls; 13. a lower end plate; 14. a through hole; 15. a wire hanging part; 151. a wire clamp slot; 16. a pin support; 161. a stitch; 162. a pin hole; 163. a bracket retaining wall; 2. a magnetic core group; 21. an upper magnetic core; 211. a top cover; 212. a wire hanging notch; 22. a lower magnetic core; 221. a bottom cover; 222. a side wall; 223. an opening; 224. a bracket notch; 23. a stem; 231. a core column block; 3. an insulating barrier sheet; 31. and connecting the holes.

Detailed Description

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following description taken in conjunction with the accompanying drawings.

It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. used herein indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. "plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The first embodiment is as follows:

as shown in fig. 1 to fig. 2, a single-board pin surrounded type magnetic core PFC inductor includes a winding frame 1, a magnetic core group 2 and a winding, and the assembly of the winding frame 1 and the winding is surrounded by the magnetic core group 2 by winding the winding on the winding frame 1, thereby realizing the assembly of the PFC inductor; magnetic core group 2 in this embodiment includes last magnetic core 21 and lower magnetic core 22 of mutual concatenation and locates the stem 23 on magnetic core 21 or lower magnetic core 22, and stem 23 pegs graft in bobbin 1, goes up magnetic core 21 and surrounds bobbin 1 outside with lower magnetic core 22, makes the winding of winding on bobbin 1 can be enclosed and carries out the magnetism shielding between magnetic core group 2.

The cross section of the upper magnetic core 21 in the first embodiment is a T-shaped structure, and includes a top cover 211 and a core column 23 vertically connected to the bottom end surface of the top cover 211, the lower magnetic core 22 is a uncovered cavity structure, and includes a bottom cover 221 and a sidewall 222 connected to the periphery of the bottom cover 221, when the upper magnetic core 21 is spliced with the lower magnetic core 22, the lower end surface of the core column 23 abuts against the upper end surface of the bottom cover 221, and the top end surface of the sidewall 222 abuts against the lower end surface of the top cover 211, so that an installation cavity is formed inside the upper magnetic core 21 and the lower magnetic core 22, and by installing the bobbin 1 in the installation cavity, the winding bobbin 1 and the winding are surrounded, the utilization rate of the magnetic core group 2 is increased, and the magnetic shielding function of the PFC inductor is enhanced; meanwhile, when the winding bobbin 1 is installed in the installation cavity, the upper end face of the winding bobbin 1 is attached to the lower end face of the top cover 211, the lower end face of the winding bobbin 1 is attached to the lower end face of the bottom cover 221, and the core column 23 is inserted into the through hole 14 of the winding bobbin 1, so that the overall structure of the PFC inductor is more compact, and the size of the PFC inductor is reduced.

The winding frame 1 in this embodiment includes a winding post 11, and an upper end plate 12 and a lower end plate 13 respectively disposed at the upper and lower ends of the winding post 11, wherein a winding is wound on the winding post 11, and the winding position of the winding is limited by the upper end plate 12 and the lower end plate 13; the through holes 14 of the present embodiment are disposed in the winding post 11 and along the length direction of the winding post 11, and the through holes 14 penetrate through the upper end plate 12 and the lower end plate 13, respectively, so as to facilitate the insertion installation of the core column 23; after the core column 23 is inserted into the through hole 14, the winding is surrounded in the space formed by combining the upper magnetic core 21, the lower magnetic core 22 and the core column 23, so that most of the winding is wrapped by the magnetic core, the magnetic shielding capability of the winding is enhanced, and the magnetic flux leakage phenomenon can be reduced.

As shown in fig. 2, the hanging portion 15 is connected to the side wall 222 of the upper end plate 12, and the pin support 16 is disposed at the position of the lower end plate 13 corresponding to the hanging portion 15, so that when the winding is connected to the pins, the outgoing lines of the winding can be led out around the hanging portion 15 and then connected to the pin support 16, thereby avoiding mutual interference when the outgoing lines are connected; the wire inlet end and the wire outlet end of the embodiment are both arranged on the pin support 16, so that the distance between the wire inlet end and the wire outlet end of the winding is shortened, the arrangement of the pin support 16 is reduced, and the carp PFC inductor is designed in a miniaturized manner.

In this embodiment, the side wall 222 is provided with an opening 223 at a position corresponding to the lead frame 16 and the wire hanging portion 15, and both the lead frame 16 and the wire hanging portion 15 extend out of the opening 223, so as to be conveniently connected to the power switch; the positions of the wire hanging portion 15 and the lead frame 16 of the present embodiment are located on the same side, and the wire inlet end and the wire outlet end of the winding are both disposed on the lead frame 16, so as to reduce the arrangement of the opening 223 and increase the surrounding area of the magnetic core set 2 as much as possible.

The wire hanging portion 15 of this embodiment is provided with the wire clip groove 151 for winding, and when each outgoing line of the winding is connected with the pin support 16, the outgoing lines can be separated by the wire clip groove 151, so that the influence of the mutual interference of the adjacent outgoing lines on the normal work of the PFC inductor is avoided.

As shown in fig. 1 and fig. 2, a plurality of pins 161 are disposed at the bottom of the pin support 16 according to the first embodiment, and the outgoing line of the winding may be connected to the pins 161 to achieve connection with the switch circuit; the number of the pins 161 in this embodiment is the same as that of the line card slot 151, so that each outgoing line of the winding can respectively wind around the line card slot 151 and be respectively connected to each pin 161, thereby realizing connection with the switch circuit.

Example two:

as shown in fig. 3 to 6, the difference from the first embodiment is that the core column 23 of the second embodiment is vertically connected to the upper end surface of the bottom cover 221 of the lower magnetic core 22, and when the bobbin 1 is installed, the core column 23 is inserted into the through hole 14 from the bottom of the bobbin 1, and the same effect as the first embodiment can be obtained; in order to realize stable installation of the upper magnetic core 21 and the lower magnetic core 22, in the second embodiment, a wire hanging retaining wall 121 surrounding the wire hanging portion 15 is further disposed on the end surface of the upper end plate 12, a support retaining wall 163 surrounding the lead support 16 is disposed on the lower end plate 13, a wire hanging notch 212 matching with the structure of the wire hanging retaining wall 121 is disposed on the top cover 211 of the upper magnetic core 21, a support notch 224 matching with the structure of the support retaining wall 163 is disposed on the lower magnetic core 22, so that when the upper magnetic core 21 is installed on the bobbin 1, the wire hanging retaining wall 121 can be embedded in the wire hanging notch 212, and when the lower magnetic core 22 is installed at the bottom of the bobbin 1, the support retaining wall 163 can be embedded in the support notch 224, thereby realizing stable installation of the upper magnetic core 21 and the lower magnetic core 22, and avoiding looseness;

meanwhile, the bottom of the lower magnetic core 22 in the second embodiment is also provided with the insulating barrier 3, so that when the PFC inductor in the second embodiment is installed, the installation insulating distance can be increased through the insulating barrier 3, and the stability of the PFC inductor is further improved; the cross section of the insulating barrier piece 3 in this embodiment is the same as that of the lower magnetic core 22, and in order to implement the installation of the insulating barrier piece 3, the connecting holes 31 are symmetrically formed in the positions, corresponding to the support notches 224, of the insulating barrier piece 3 in this embodiment, so that when the insulating barrier piece 3 is installed, pins 161 located at two sides of the pin support 16 can be inserted into the connecting holes 31, and thus the working stability of the PFC inductor is improved.

In another embodiment, as shown in fig. 5 and 6, the upper magnetic core 21 and the lower magnetic core 22 have the same structure, and the stem 23 includes two stem blocks 231 having the same structure, and the two stem blocks 23 are respectively vertically connected to the lower end surface of the top cover 211 of the upper magnetic core 21 and the upper end surface of the bottom cover 221 of the lower magnetic core 22, when the upper magnetic core 21 and the lower magnetic core 22 are mounted on the bobbin 1, the two stem blocks 231 are inserted into the through hole 14 of the bobbin 1, and the end surfaces of the two stem blocks 231 are tightly attached to form the stem 23 in the through hole 14, and the end surfaces of the side walls 222 of the upper magnetic core 21 and the lower magnetic core 22 having the same structure abut against each other, so as to surround the bobbin 1, thereby achieving the same technical effects as in the first embodiment.

Example three:

as shown in fig. 7, the difference from the first embodiment is that a plurality of pin holes 162 are formed in the pin holder 16 of the third embodiment, and the outgoing line of the winding can be connected to the circuit board of the switching power supply through the pin holes 162; the number of the pin holes 162 is the same as that of the line card slots 151, so that each outgoing line led out from the line card slots 151 can be connected to each pin hole 162; when the outgoing lines of the windings are connected, the outgoing lines are wound around the line clamping grooves 151 and are inserted into the pin holes 162, and pass through the pin holes 162 to be connected with the switch circuit.

The working principle of the embodiment is as follows: in the embodiment, the upper magnetic core 21 and the lower magnetic core 22 which are spliced with each other are arranged, and the assembly body of the bobbin 1 and the coil is installed in the installation cavity formed by splicing the upper magnetic core 21 and the lower magnetic core 22, so that the coil is integrally surrounded by the upper magnetic core 21 and the lower magnetic core 22, the utilization rate of the magnetic cores is improved, and the magnetic shielding capacity is good; and, when the upper magnetic core 21 of this embodiment was installed with lower magnetic core 22, the inner wall of upper magnetic core 21 and lower magnetic core 22 all with bobbin 1 butt to reduce the whole volume of PFC inductance, be favorable to miniaturized product design.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and modifications made by those skilled in the art based on the present invention are within the scope of the present invention.

Claims

1. The utility model provides a veneer pin enclosed magnetic core PFC inductance, includes bobbin (1), magnetic core group (2) and twines the winding on bobbin (1), its characterized in that: magnetic core group (2) including last magnetic core (21) and lower magnetic core (22) of mutual concatenation and locate magnetic core (21) and/or down stem (23) on magnetic core (22), it includes top cap (211) to go up magnetic core (21), lower magnetic core (22) include bottom (221) and locate bottom (221) side wall (222) of border department all around, go up inside formation installation cavity behind magnetic core (21) and lower magnetic core (22) concatenation, bobbin (1) and the assembly body of winding install in the installation cavity and by last magnetic core (21) and lower magnetic core (22) surround.

2. The single-board pin-wrapped core PFC inductor of claim 1, wherein: the stem (23) is positioned in the mounting cavity, and the stem (23) is vertically connected to the end surface of the bottom cover (221) and/or the end surface of the top cover (211).

3. The single-board pin-wrapped core PFC inductor of claim 2, wherein: the winding framework (1) comprises winding posts (11), an upper end plate (12) and a lower end plate (13) which are respectively arranged at the upper end and the lower end of each winding post (11), and the windings are wound on the winding posts (11).

4. The PFC inductor of claim 3, wherein: the winding post (11) is internally provided with a through hole (14) penetrating through the upper end plate (12) and the lower end plate (13), and the core post (23) is inserted in the through hole (14).

5. The PFC inductor of claim 4, wherein: the winding is characterized in that a hanging wire part (15) is connected to the side wall (222) of the upper end plate (12), a pin support (16) is arranged at the position, corresponding to the hanging wire part (15), of the lower end plate (13), and the outgoing wire of the winding bypasses the hanging wire part (15) and is connected to the pin support (16).

6. The PFC inductor of claim 5, wherein: the bottom of the pin support (16) is provided with a plurality of pins (161), and each outgoing line of the winding is connected with each pin (161) after bypassing the hanging wire part (15).

7. The PFC inductor of claim 5, wherein: the winding is characterized in that the pin support (16) is provided with a plurality of pin holes (162), and each outgoing line of the winding is connected in each pin hole (162) after bypassing the hanging wire part (15).

8. A single-board pin-wrapped magnetic core PFC inductor according to any one of claims 6 or 7, wherein: openings (223) are formed in the positions, corresponding to the pin support (16) and the hanging wire portion (15), of the side wall (222), and the pin support (16) and the hanging wire portion (15) extend out of the openings (223).

9. The single-board pin-wrapped core PFC inductor according to claim 6, wherein: be equipped with on upper end plate (12) terminal surface and surround hanging line barricade (121) of hanging line portion (15), be equipped with on lower end plate (13) and surround support barricade (163) of pin support (16), be equipped with on going up magnetic core (21) with hanging line barricade (121) structure looks adaptation hang line breach (212), be equipped with on lower magnetic core (22) with support barricade (163) structure looks adaptation support breach (224), hanging line barricade (121) and hanging line breach (212) gomphosis, support barricade (163) and support breach (224) gomphosis.

10. The PFC inductor of claim 9, wherein: the bottom of the lower magnetic core (22) is provided with an insulating separation blade (3), connecting holes (31) are symmetrically formed in the insulating separation blade (3) at positions corresponding to the support notches (224), and pins (161) located on two sides of the pin support (16) are inserted into the connecting holes (31).