Horizontal common mode inductor and switching power supply

Abstract

The utility model discloses a horizontal common mode inductor which comprises a framework and an inductor body coil. The inductance coil is arranged in the groove, the bottom groove surface is designed to be I-shaped, and the width of the winding is reserved, so that the coil moving space is effectively limited, and the winding is prevented from shaking. The middle part of the bottom groove surface protrudes to play a role in separating plates and preventing abrasion between windings, and lead angles are designed on the two sides of the separating plates to be suitable for coil winding assembly and prevent abrasion of a framework and the windings. Compared with the prior art, the horizontal common mode inductor has the advantages that the integral inductor can be embedded in a PCB (printed circuit board), the integral height of a product is reduced without the thickness of the PCB, and only the thickness of the bottom of the groove surface and the thickness of the inductor body protruding relative to the framework need to be considered, so that the height of the product is reduced to a great extent, and the product is light, thin, attractive and high in automation degree; the production is convenient. The utility model further discloses a switching power supply comprising the horizontal common mode inductor.

Description

Technical Field

[0001] This utility model belongs to the field of inductors in switching power supplies, specifically relating to a horizontal common-mode inductor mounted on a suspended PCB board and a switching power supply. Background Technology

[0002] In today's rapidly developing technological era, switching power supplies, as a crucial component of modern technology, are facing exciting transformations. Future switching power supplies are trending towards electronic integration, high efficiency, multi-functionality, and ultra-thinness. Switching power supplies used in LED electronic displays present even greater challenges in achieving thinner and lighter designs. The key to this lies in minimizing the overall height of the internal components. Inductors, as indispensable components in switching power supplies, require small size, flatness, and good heat dissipation. Traditional wire-wound common-mode inductors are increasingly unable to meet these requirements. Traditional inductors typically assemble the inductor coil onto a standard frame and place it on the product's circuit board surface. Based on existing common-mode inductors on the market, the overall inductor height needs to consider the inductor coil height, frame height, and PCB thickness. This presents significant limitations for some ultra-thin isolated LED switching power supply products. Utility Model Content

[0003] The present invention aims to overcome the limitation that the height of traditional inductors cannot be reduced by providing a suspended embedded inductor to solve the problem that products with limited height cannot be used.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A horizontal common-mode inductor, suitable for nested assembly with a power supply PCB board, includes a frame, a magnetic core assembled on the frame, and two coils symmetrically wound on the magnetic core. A pin is provided at the lower end of the frame. The frame includes terminal blocks on both sides and connecting arms mounted on the terminal blocks. The connecting arms are horizontally shaped like the letter "I". The top surface of the connecting arm is flat, and grooves are formed on both sides of the middle section of the connecting arm corresponding to the coil assembly positions. These grooves are used for coil assembly positioning. The bottom surface of the connecting arm is flat, and the bottom surface of the connecting arm connects with the two inner sides of the terminal blocks to form a void area. This void area is used to accommodate the magnetic core and is end-limited by the two inner sides of the frame terminal blocks. The magnetic core is horizontally assembled in the void area on the bottom surface of the frame, and the coil of the magnetic core is assembled in the groove position of the frame.

[0006] Preferably, the top surface of the connecting arm of the skeleton is an "I"-shaped flat surface, and the bottom surface of the connecting arm of the skeleton is an "I"-shaped flat surface.

[0007] Preferably, the groove formed on the lower side of the connecting arm of the skeleton is an arc-shaped groove.

[0008] Preferably, the magnetic core is a rectangular ring-shaped magnetic core, with the top of the magnetic core coil basically flush with the top surface of the frame connecting arm, or the top of the magnetic core coil slightly higher than the top surface of the frame connecting arm.

[0009] Preferably, the terminal block of the skeleton includes four rectangular bosses extending to both sides at the corners and a connecting part connecting two bosses. The bottom surface of the bosses and the connecting part are flush, and the thickness of the connecting part is thinner than that of the bosses. The PIN pins of the skeleton are disposed on the bosses.

[0010] Preferably, the top surface of the terminal block of the frame is lower than the top surface of the connecting arm, and a section of the PIN pin on the terminal block protrudes outward for soldering the coil wire end, and can be used for assembly with the pre-reserved through hole on the PCB board.

[0011] Preferably, the height difference between the top surface of the terminal block of the skeleton and the top surface of the connecting arm is equivalent to the thickness of the embedded PCB board.

[0012] This utility model also provides a switching power supply, including the above-mentioned horizontal common mode inductor and PCB board. The PCB board has a cutout portion and a pad with a through hole at the position of the PIN pin on the corresponding skeleton terminal block. The common mode inductor is assembled and embedded into the PCB board from the cutout portion to expose the top surface of the connecting arm of the skeleton. After the top of the PIN pin of the skeleton terminal block is assembled into the through hole of the PCB board, the top surface of the skeleton terminal block abuts against the bottom surface of the PCB board.

[0013] Preferably, the bottom of the common-mode inductor coil is suspended.

[0014] Preferably, the common-mode inductor has an insulating layer formed on its surface by immersion in varnish.

[0015] Preferably, the wire of the magnetic core coil is a flat copper wire.

[0016] As described above, the beneficial effects of this utility model of horizontal common-mode inductor and switching power supply are as follows:

[0017] 1. The bottom groove of the frame is designed with reference to the shape of "I" to reserve the width of the winding, effectively limiting the space for coil movement and preventing the winding from shaking.

[0018] 2. The bottom surface of the frame connecting arm has grooves on both sides to form a protrusion in the middle, which acts as a partition to prevent wear between windings. The partition is designed with chamfers on both sides to facilitate coil winding assembly, prevent wear between the frame and windings, and increase the overall space utilization.

[0019] 3. When the user uses, the PCB board hollows the area of the inductor body, the skeleton "Ω" design four pin bosses on both sides, the pin needle penetrates the hole position of the pin boss, the head and tail of the winding are welded with one end of the pin needle, and the electrical connection function with the PCB board can be realized, the pin boss is equivalent to a support, and the whole product is supported

[0020] 4. The common mode inductor is embedded in the PCB board, so that the overall height of the product can save the thickness of one PCB board, only the thickness of the terminal table of the skeleton and the thickness of the magnetic core body protruding relative to the skeleton need to be considered, the overall height of the power supply product is greatly reduced, the power supply product is light and thin, and the structure is simple, the degree of automation is high, and production is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is an assembly explosion perspective structural view of the horizontal common mode inductor and the PCB board of the utility model;

[0022] Fig. 2 It is a perspective view of the bottom view angle of the horizontal common mode inductor of the utility model;

[0023] Fig. 3 It is a perspective view of the top view angle of the skeleton of the horizontal common mode inductor of the utility model;

[0024] Fig. 4 It is a perspective view of the bottom view angle of the skeleton of the horizontal common mode inductor of the utility model.

[0025] In the above drawings, the reference signs are as follows:

[0026] 10. skeleton, 101. connecting arm, 102. middle section of the connecting arm, 103. two ends of the connecting arm, 104. groove, 105. terminal table, 106. connecting part, 107. boss, 108. empty area, 20. magnetic core, 30. coil winding, 302. head and tail of the coil, 40. PIN needle, 50. PCB board, 501. hollow part, 502. through-hole pad DETAILED DESCRIPTION

[0027] The utility model / invention and the beneficial effects thereof will be further described in detail below in combination with specific implementation manners and the drawings of the specification, but the specific implementation manner of the utility model / invention is not limited to this.

[0028] For example, Figs. 1 to 4As shown, the utility model provides a horizontal common mode inductor, it includes skeleton 10 and magnetic core 20, coil winding 30, PIN needle 40, PCB board 50. The magnetic core 20 is rectangular annular magnetic core, after determining the coil specification, the wire head wire tail 302 of coil winding 30 that the magnetic core 2 two sides are respectively using winding forming machine automation winding need tin dipping, remove the paint, form the inductance wire package. Preferably, the wire of coil winding 30 is flat copper wire. The coil winding can also be referred to as coil.

[0029] Skeleton 10, including the terminal table of being located at both sides and the connecting arm 101 of being erected on both terminal tables, the connecting arm 101 is overall horizontally placed and is in the shape of a Chinese character Gong, the top surface of connecting arm 101 is plane, the recess 104 is set up at the both sides below the middle segment 102 of connecting arm and corresponds the coil assembly position, and the recess 104 is used for the assembly positioning of coil, the bottom surface of connecting arm 101 is plane, and the bottom surface of connecting arm is connected with the both inner sides of terminal table to form empty area 108, and the empty area is used for accommodating magnetic core and is limited by the both inner sides of skeleton terminal table End position. The magnetic core 20 is horizontally assembled in the empty area 108 of skeleton bottom surface, and the coil 30 of magnetic core is assembled in the recess position of skeleton.

[0030] Specifically, skeleton 10 design is divided into two parts, the first part connecting arm 101, reference is to the design of Chinese character Gong, the overall length of connecting arm 101 is determined according to the length of inductance wire package, the length of middle segment 102 of connecting arm 101 is designed according to the overall length of coil winding 30 on both sides, to limit the moving space of coil winding 30 and magnetic core 20 winding wire package, prevent shaking. Preferably, the middle segment 102 and both ends 103 of connecting arm 101 can be slightly thickened along Y direction, the recess 104 set up at both sides below the middle segment 102 of connecting arm and corresponds the magnetic core assembly position can be chamfered, and the smooth surface design of process can make coil winding 30 and skeleton empty area more no-abrasionly adhere to connect and place. The recess in the middle part of the bottom surface of connecting arm 101 is formed by setting recesses on both sides, which acts as a partition to prevent abrasion between windings, and the guide angle is designed on both sides of the partition to facilitate coil winding assembly, prevent abrasion between skeleton and winding, and increase overall space utilization. The second part is the terminal table 105 of connecting arm 101, which is four bosses 107 extending out along X direction at both ends of connecting arm 101, the height of boss 107 is determined by theoretical calculation of the thickness of PCB and the space height of inductance sinking, and there is a connecting part 106 between bosses on the same side, the first part and the second part are connected, and the second part mainly supports the operation of inductance, and each boss of terminal table 105 has a small hole, which is opened according to the PIN needle 40, and the PIN needle is a T-shaped PIN needle, which is arranged in the hole of the boss. PIN needle is a metal pin, or can be called pin.

[0031] Preferably, the top surface of the connecting arm 101 of the skeleton is an "I"-shaped flat surface, and the bottom surface of the connecting arm 101 of the skeleton is an "I"-shaped flat surface. The groove 104 opened on the lower side of the connecting arm of the skeleton 10 is an arc-shaped groove. The top of the magnetic core coil 30 is basically flush with the top surface of the connecting arm 101 of the skeleton, or the top of the magnetic core coil 30 is slightly higher than the top surface of the connecting arm 101 of the skeleton. The terminal block 105 of the skeleton includes four rectangular bosses 107 extending to both sides at the corners and a connecting portion 106 connecting two bosses. The bosses 107 are flush with the bottom surface of the connecting portion 106, and the thickness of the connecting portion 106 is thinner than that of the bosses 107 when viewed from the bottom surface. The PIN pins 40 of the skeleton are provided on the bosses. The top surface of the terminal block 105 of the skeleton is lower than the top surface of the connecting arm 101, and a section of the top of the PIN pin 40 on the terminal block is exposed outside for soldering the coil wire end, and can be used for assembly with the through hole reserved on the PCB board 50. The height difference between the top surface of the terminal block 105 of the frame and the top surface of the connecting arm 101 is equivalent to the thickness of the embedded PCB board 50.

[0032] This utility model discloses a common-mode inductor, comprising a frame and an inductor coil. The frame is designed in an "Ω" shape. After the magnetic core and windings are automatically formed, the inductor coil is placed in a slot. The bottom slot surface is designed with an "I" shape to accommodate the width of the windings, effectively limiting the movement space of the coils and preventing winding sway. The middle part of the bottom slot surface of the frame is raised, acting as a partition to prevent wear between windings. The partition has chamfered edges on both sides for coil winding assembly, preventing wear on the frame and windings. When in use, the PCB board has a cutout area to accommodate the inductor body. Four pin bosses are designed on both sides of the "Ω" shape of the frame. The pins pass through the holes in the pin bosses. The ends of the winding wires are soldered to one end of the pins to achieve electrical connection with the PCB board. The pin bosses act as supports, elevating the entire product so that the inductor can be embedded in the PCB board. The overall height of the product is reduced by saving PCB board thickness. Only the thickness of the frame terminal block and the thickness of the inductor body protruding from the frame need to be considered. The overall height of the power supply product is greatly reduced, making the power supply product thinner, more aesthetically pleasing, more automated, and easier to manufacture.

[0033] The common mode inductor is applied to the switching power supply, wherein the design of the PCB 50, as an electrical component for connecting various devices, is used for the PCB layout of the inductor, a solder pad position connected with the PIN pin, and a hollowed PCB and a reserved position of the whole inductor wire package. Specifically, the design of the PCB 50 firstly needs to open the position of the hollowed part 501, and then the center value position of the four through holes of the solder pad 502 is determined according to the position of the PIN pin 40 to the magnetic core, and the size of the hole position of the solder pad 502 is determined according to the diameter of the PIN pin 40 and the opening allowance. The common mode inductor is assembled and embedded into the PCB 50 from the hollowed part 501 to expose the top surface of the connecting arm 101 of the skeleton, and the top end of the PIN pin 40 of the skeleton terminal table 105 is assembled into the through hole solder pad 502 of the PCB 50, and the top surface of the skeleton terminal table 105 abuts against the bottom surface of the PCB 50. Preferably, the coil bottom of the common mode inductor is suspended.

[0034] At this time, the formed wire package is horizontally placed in the groove 104, the wire head and tail 302 are respectively welded with the PIN pin 40 on the boss at both ends, and the whole inductor is finally insulated and coated by the immersion of water to solidify.

[0035] The inductor is welded in the PCB 50 through the solder pad 502 and the PIN pin 40, which can effectively reduce the thickness of the PCB, the height of the inductor body, and effectively control the sinking height, provide the space utilization rate of the product, make the space below the circuit board be fully used, and the winding bottom is suspended, which is more conducive to the heat dissipation of the inductor.

[0036] The above embodiments are only used to help understand the concept of the utility model, and do not limit the utility model. For ordinary skilled persons in the technical field, any modification, equivalent replacement, improvement, etc. made without departing from the principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A horizontal common-mode inductor, suitable for nested assembly with a power supply PCB board, comprising a frame, a magnetic core assembled on the frame, and two coils symmetrically wound on the magnetic core, wherein a pin is provided at the lower end of the frame, characterized in that: The frame includes terminal blocks on both sides and connecting arms mounted on the two terminal blocks. The connecting arms are in the shape of a horizontally placed "I" shape. The top surface of the connecting arm is flat. Grooves are provided on both sides of the middle section of the connecting arm at the coil assembly positions. The grooves are used for coil assembly and positioning. The bottom surface of the connecting arm is flat, and the bottom surface of the connecting arm connects with the two inner sides of the terminal blocks to form an empty area. The empty area is used to accommodate the magnetic core and is end-limited by the two inner sides of the frame terminal blocks. The magnetic core is horizontally assembled in the empty area on the bottom surface of the frame, and the coil of the magnetic core is assembled in the groove position of the frame.

2. The horizontal common mode inductor of claim 1, wherein: The top surface of the connecting arm of the frame is a flat surface in the shape of an "I" and the bottom surface of the connecting arm of the frame is a flat surface in the shape of an "I".

3. The horizontal common mode inductor of claim 1, wherein: The groove on the lower side of the connecting arm of the frame is an arc-shaped groove.

4. The horizontal common mode inductor of claim 1, wherein: The magnetic core is a rectangular ring-shaped magnetic core, with the top of the magnetic core coil basically flush with the top surface of the frame connecting arm, or the top of the magnetic core coil slightly higher than the top surface of the frame connecting arm.

5. The horizontal common mode inductance of claim 1, wherein: The terminal block of the skeleton includes four rectangular bosses extending to both sides at the corners and a connecting part connecting two bosses. The bottom surface of the bosses and the connecting part are flush, and the thickness of the connecting part is thinner than that of the bosses. The PIN pins of the skeleton are located on the bosses.

6. The horizontal common mode inductance of claim 1, wherein: The top surface of the terminal block of the frame is lower than the top surface of the connecting arm, and a section of the PIN pin on the terminal block protrudes outward for soldering the coil wire end, and can be used for assembly with the pre-reserved through hole on the PCB board.

7. The horizontal common mode inductance of claim 1, wherein: The height difference between the top surface of the terminal block of the frame and the top surface of the connecting arm is equivalent to the thickness of the embedded PCB board.

8. The horizontal common mode inductance of claim 1, wherein: The core coil is made of flat copper wire.

9. A switching power supply comprising the horizontal common mode inductor and the PCB board according to any one of claims 1 to 8, characterized in that, The PCB board has a cutout, and a pad with a through hole is provided at the position of the PIN pin on the corresponding skeleton terminal block. The common mode inductor is assembled and embedded into the PCB board from the cutout so that the top surface of the connecting arm of the skeleton is exposed. After the top of the PIN pin of the skeleton terminal block is assembled into the through hole of the PCB board, the top surface of the skeleton terminal block abuts against the bottom surface of the PCB board.

10. The switching power supply of claim 9, wherein: The bottom of the common-mode inductor coil is suspended.

11. The switching power supply of claim 9, wherein: The common-mode inductor has an insulating layer on its surface formed by immersion in varnish.

Images