Compact shielded coupling inductor
By adopting side-by-side winding design of flat coil and T-core in the coupled inductor, the problem of coil winding consistency in low-voltage scenarios is solved, the Q value and coupling coefficient of the inductor are improved, and the high-frequency performance and output are improved. efficiency.
Patent Information
- Application Number
- CN202420346258.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-25
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-02-25
AI Technical Summary
In low-voltage use scenarios for existing coupled inductors, it is difficult to ensure the consistency of the wiring, which affects the Q value and coupling coefficient of the inductor.
A compact shielded coupling inductor is designed, using a flat coil and a T-shaped magnetic core. The coil is wound side by side by side by layer, and the installation space and the structure of the magnetic cover and seat body assembly are used to ensure the consistency of the coil wiring. Improve the Q value and coupling coefficient of the inductor.
Through this design, the Q value, coupling coefficient and high frequency performance of the inductor are improved, DCR is reduced, overcurrent capability is enhanced, manufacturing costs are reduced, and output efficiency is improved.
Smart Images
Figure CN222213866U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic components, in particular to a compact shielded coupled inductor. Background Art
[0002] At present, high efficiency, energy saving and environmental protection have become the development direction of the electronics industry, and small size, low radiation and high power density design have become the mainstream design in the market. Since the technology of semiconductors such as gallium nitride and silicon carbide can greatly increase the switching frequency of power supply and reduce losses, the product size can be further compressed.
[0003] Many high power density solutions have been designed according to market demand. Among them, the SEPIC (single-ended primary inductor converter) with smaller size and higher efficiency has obvious advantages and has been recognized by the industry. The main reason is that SEPIC adopts a coupled inductor design. Using a 1:1 coupled inductor SEPIC can force the ripple current of the inductor to be separated between the two windings. Compared with using two separate inductors, the coupled inductor only needs half the inductance value to produce the same ripple current. A coupled inductor is equivalent to two separate inductors with double the inductance value in the same size package, so the coupled inductor has a lower DCR (DC resistance), greater overcurrent capability and lower manufacturing cost. In some existing coupled inductors, it is difficult to ensure the consistency of the wiring when winding the coil in low-voltage scenarios, which affects the Q value and coupling coefficient of the inductor. Utility Model Content
[0004] Based on this, it is necessary to provide a compact shielded coupled inductor, which aims to solve the technical problem that in some existing coupled inductors, it is difficult to ensure the consistency of the wiring when winding the coil in low-voltage scenarios, thereby affecting the Q value and coupling coefficient of the inductor.
[0005] The utility model provides a compact shielded coupled inductor, which comprises a magnetic cover, a seat assembly, a magnetic core and a coil, wherein the coil is flat, the seat assembly comprises a mounting seat and a terminal connected to the mounting seat, the magnetic cover and the mounting seat are enclosed to form an installation space, the magnetic core comprises a placement plate and a middle column connected to the placement plate, the coil comprises a first flat sheet and a second flat sheet, the first flat sheet and the second flat sheet are stacked and wound to form the coil, the placement plate is installed in the installation space and is used to place the first flat sheet and the second flat sheet, the first flat sheet and the second flat sheet are both sleeved on the middle column and are both connected to the terminal.
[0006] In one embodiment, the first flat sheet includes a first body, and a first lead and a second lead connected to the first body, the second flat sheet includes a second body, and a third lead and a fourth lead connected to the second body, the first lead and the third lead are set at an angle, and the second lead and the fourth lead are set at an angle.
[0007] In one of the embodiments, the first flat sheet further includes a first pin and a second pin, the second flat sheet further includes a third pin and a fourth pin, the first pin is connected to the first lead, the second pin is connected to the second lead, the third pin is connected to the third lead, and the fourth pin is connected to the fourth lead. There are multiple terminals, which are exposed on the outside of the magnetic cover and the mounting base, and the first pin, the second pin, the third pin and the fourth pin are connected to each of the terminals one by one.
[0008] In one embodiment, the magnetic cover is provided with a first groove, and the mounting seat is provided with a second groove. During the enclosing process of the magnetic cover and the mounting seat, the first groove and the second groove form an avoidance space, and the avoidance space is connected to the mounting space and is used to avoid the terminal.
[0009] In one embodiment, the magnetic cover is further provided with a plurality of lead grooves, and the first lead, the second lead, the third lead and the fourth lead are respectively placed in the lead grooves.
[0010] In one embodiment, each of the terminals includes an electrode and a clip connected to the electrode, each of the electrodes is mounted on the mounting seat, and the first pin, the second pin, the third pin and the fourth pin are respectively engaged and connected with the clip.
[0011] In one embodiment, the mounting seat is provided with a slot body, and the electrode is mounted in the slot body.
[0012] In one embodiment, the axial cross-section of the magnetic core is T-shaped.
[0013] In one embodiment, the mounting seat is provided with a positioning groove, the placement plate is installed in the positioning groove, and the positioning groove is used to locate the position of the placement plate.
[0014] In one of the embodiments, the magnetic cover is provided with a mounting groove, and the mounting seat is provided with a positioning boss. During the process of enclosing the magnetic cover and the mounting seat, the positioning boss can be installed in the mounting groove.
[0015] Implementing the embodiments of the present utility model will have the following beneficial effects:
[0016] The compact shielded coupled inductor of the utility model is adopted. The coil of the compact shielded coupled inductor is flat. The magnetic cover and the mounting seat enclose an installation space. The first flat sheet and the second flat sheet are stacked and wound to form a coil. The placement plate is installed in the installation space and is used to place the first flat sheet and the second flat sheet. The first flat sheet and the second flat sheet are both sleeved with a center column and are both connected to the terminal. The first flat sheet and the second flat sheet are stacked and wound to form a coil. That is to say, the first flat sheet and the second flat sheet can be wound side by side, so that the wiring consistency of the first flat sheet and the second flat sheet is guaranteed, thereby improving the Q value, coupling coefficient and high-frequency performance of the inductor. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] in:
[0019] Figure 1 FIG. 1 is an isometric diagram of a compact shielded coupled inductor according to one embodiment.
[0020] Figure 2 for Figure 1 Exploded view of the compact shielded coupled inductor shown.
[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of section A in the compact shielded coupled inductor shown.
[0022] Figure 4 for Figure 2 Schematic diagram of the magnetic core, first flat sheet, second flat sheet and mounting base in the compact shielded coupled inductor shown.
[0023] Figure 5 for Figure 2 Schematic diagram of the core and mounting in the compact shielded coupled inductor shown.
[0024] Figure 6 for Figure 2 Schematic diagram of the mounting base in the compact shielded coupled inductor shown.
[0025] Figure 7 for Figure 2 Schematic diagram of the magnetic cage in the compact shielded coupled inductor shown.
[0026] Reference numerals:
[0027] 1. Magnetic cover; 11. Mounting slot; 12. Lead slot;
[0028] 2. seat assembly; 21. mounting seat; 211. positioning groove; 212. positioning boss; 213. slot body; 22. terminal; 221. electrode; 222. buckle; 2221. first buckle body; 2222. second buckle body;
[0029] 3. Magnetic core; 31. Placement plate; 32. Middle column;
[0030] 4. first flat sheet; 41. first turn; 42. first body; 43. first lead wire; 44. first pin;
[0031] 5. second flat sheet; 51. second turn; 52. second body; 53. third lead wire; 54. fourth lead wire; 55. third pin; 56. fourth pin;
[0032] 100. Avoidance space; 101. First slot; 102. Second slot. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0035] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.
[0036] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0037] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0038] Please combine Figures 1 to 7 , the compact shielded coupled inductor provided by the utility model is now described. The compact shielded coupled inductor can be used in a power switch. The compact shielded coupled inductor includes a magnetic cover 1, a seat assembly 2, a magnetic core 3 and a coil. The coil is flat. The seat assembly 2 includes a mounting seat 21 and a terminal 22 connected to the mounting seat 21. The magnetic cover 1 and the mounting seat 21 enclose an installation space. The magnetic core 3 includes a placement plate 31 and a middle column 32 connected to the placement plate 31. The coil includes a first flat sheet 4 and a second flat sheet 5. The first flat sheet 4 and the second flat sheet 5 are stacked and wound to form a coil. The placement plate 31 is installed in the installation space and is used to place the first flat sheet 4 and the second flat sheet 5. The first flat sheet 4 and the second flat sheet 5 are both sleeved with the middle column 32 and are both connected to the terminal 22. By setting the placement plate 31, the first flat sheet 4 and the second flat sheet 5 can be placed on the placement plate 31 during the installation process. By providing the center column 32 , the first flat sheet 4 and the second flat sheet 5 can be fixed, and the first flat sheet 4 and the second flat sheet 5 are prevented from being offset or skewed, thereby increasing the inductance value of the inductor.
[0039] It can be understood that the coil of the compact shielded coupled inductor is flat, the magnetic cover 1 and the mounting base 21 enclose an installation space, the first flat sheet 4 and the second flat sheet 5 are stacked and wound to form a coil, the placement plate 31 is installed in the installation space and is used to place the first flat sheet 4 and the second flat sheet 5, the first flat sheet 4 and the second flat sheet 5 are both sleeved with a center column 32, and are both connected to the terminal 22, the first flat sheet 4 and the second flat sheet 5 are stacked and wound to form a coil, that is, the first flat sheet 4 and the second flat sheet 5 can be wound side by side, so that the wiring consistency of the first flat sheet 4 and the second flat sheet 5 is guaranteed, thereby improving the Q value, coupling coefficient and high-frequency performance of the inductor.
[0040] In addition, the existing I-shaped magnetic core 3 wound by round enameled wire is replaced by the flat first flat sheet 4 and the second flat sheet 5 to set the magnetic core 3, so that the flat first flat sheet 4 and the second flat sheet 5 increase the cross-sectional area of the wire with the same number of turns compared with the round enameled wire, reduce the DCR of the first flat sheet 4 and the second flat sheet 5, achieve a greater overcurrent capacity, and thus improve the output efficiency.
[0041] It should be supplemented that the first flat sheet 4 and the second flat sheet 5 are flat, which can effectively reduce the high-frequency skin effect and further reduce the copper wire loss caused by the high-frequency ripple.
[0042] It should be noted that the axial cross section of the magnetic core 3 is T-shaped. The T-shaped magnetic core 3 is used to increase the inductance value. The first flat sheet 4 and the second flat sheet 5 are used to generate electromagnetic induction, and the number of turns of the first flat sheet 4 and the second flat sheet 5 determines the size of the inductance value.
[0043] In implementation, the first flat sheet 4 has a plurality of first turns 41 , and the second flat sheet 5 has a plurality of second turns 51 , and the first turns 41 and the second turns 51 are alternately arranged.
[0044] In some embodiments, for switching frequencies above 1 MHz: the magnetic core 3 is made of (nickel-zinc) Ni-Zn ferrite material, and the magnetic cover 1 is made of (nickel-zinc) Ni-Zn ferrite, which has low core loss and excellent magnetic shielding effect, and is suitable for designing low inductance values (below 6.8uH) and is used in high-frequency solutions.
[0045] For switching frequencies below 1MHz: Core 3 is made of (manganese-zinc) Mn-Zn ferrite material, and magnetic cover 1 is made of (manganese-zinc) Mn-Zn ferrite. It is designed with small and medium inductance values (below 22uH), low core loss, and excellent magnetic shielding effect. Compared with core 3 made of (nickel-zinc) Ni-Zn ferrite material, magnetic cover 1 uses (nickel-zinc) Ni-Zn ferrite, which has better anti-saturation ability.
[0046] For a switching frequency of about 500KHz: core 3 is made of sendust material, and magnetic cover 1 is made of (manganese-zinc) Mn-Zn ferrite. Compared with core 3 made of (manganese-zinc) Mn-Zn ferrite material, magnetic cover 1 made of (manganese-zinc) Mn-Zn ferrite has relatively better DC bias characteristics.
[0047] For a switching frequency of about 500KHz: core 3 is made of iron-nickel material, and magnetic cover 1 is made of (manganese-zinc) Mn-Zn ferrite. Compared with core 3 made of iron-silicon-aluminum material, magnetic cover 1 is made of (manganese-zinc) Mn-Zn ferrite, which has lower core loss and the most outstanding DC bias characteristics.
[0048] For switching frequencies below 200KHz: the magnetic core 3 is made of iron silicon or iron silicon chromium alloy, and the magnetic cover 1 is made of (manganese-zinc) Mn-Zn ferrite, which has excellent DC bias characteristics and cost advantages.
[0049] In this embodiment, the first flat sheet 4 includes a first body 42, and a first lead 43 and a second lead connected to the first body 42. The second flat sheet 5 includes a second body 52, and a third lead 53 and a fourth lead 54 connected to the second body 52. The first lead 43 is set at an angle to the third lead 53, and the second lead is set at an angle to the fourth lead 54. Specifically, the first lead 43 is set at an angle of 90 degrees to the third lead 53, and the second lead is set at an angle of 90 degrees to the fourth lead 54, which makes the first lead 43, the second lead, the third lead 53 and the fourth lead 54 lead out from different positions, so that the first lead 43, the second lead, the third lead 53 and the fourth lead 54 have better coplanarity without affecting the number of turns of the first flat sheet 4 and the second flat sheet 5.
[0050] Further, the first flat sheet 4 also includes a first pin 44 and a second pin, and the second flat sheet 5 also includes a third pin 55 and a fourth pin 56. The first pin 44 is connected to the first lead 43, the second pin is connected to the second lead, the third pin 55 is connected to the third lead 53, and the fourth pin 56 is connected to the fourth lead 54. There are multiple terminals 22, which are exposed outside the magnetic cover 1 and the mounting seat 21. The first pin 44, the second pin, the third pin 55 and the fourth pin 56 are connected to each terminal 22 in a one-to-one correspondence. By exposing the terminal 22 outside the magnetic cover 1 and the mounting seat 21, the connection between each terminal 22 and the first pin 44, the second pin, the third pin 55 and the fourth pin 56 can be observed. In addition, since the terminal 22 is exposed, it is not necessary to bend the terminal 22 during the connection between the magnetic cover 1 and the mounting seat 21, thereby avoiding the failure of the connection between each terminal 22 and the first pin 44, the second pin, the third pin 55 and the fourth pin 56.
[0051] In implementation, the magnetic cover 1 is provided with a first groove 101, and the mounting seat 21 is provided with a second groove 102. During the enclosing process of the magnetic cover 1 and the mounting seat 21, the first groove 101 and the second groove 102 form an escape space 100, which is connected to the mounting space and is used to escape the terminal 22. In this way, the terminal 22 can be exposed outside the magnetic cover 1 and the mounting seat 21.
[0052] In one embodiment, if Figure 1 As shown, the inductor housing of the utility model adopts a U-shaped magnetic cover 1 design, which does not require additional sealing treatment on the top of the inductor, and the production line is relatively shortened, which improves production efficiency. The shielding structure design reduces magnetic field leakage, has strong anti-electromagnetic interference performance, and improves the inductance value.
[0053] In one embodiment, if Figure 2 , Figure 3 , Figure 4 and Figure 7As shown, the magnetic cover 1 is further provided with a plurality of lead grooves 12, and the first lead 43, the second lead, the third lead 53 and the fourth lead 54 are respectively placed in each lead groove 12. By providing the lead grooves 12, the first lead 43, the second lead, the third lead 53 and the fourth lead 54 can be respectively led out from each lead groove 12 and connected to each terminal 22, thereby avoiding interference between the first lead 43, the second lead, the third lead 53 and the fourth lead 54 and the magnetic cover 1.
[0054] In one embodiment, if Figures 2 to 6 As shown, each terminal 22 includes an electrode 221 and a buckle 222 connected to the electrode 221. Each electrode 221 is mounted on the mounting seat 21, and the first pin 44, the second pin, the third pin 55 and the fourth pin 56 are respectively engaged and connected with each buckle 222. By providing the electrode 221, the electrode 221 can be electrically connected to the welding part of the circuit board. By providing the buckle 222, each buckle 222 can be electrically connected to the first pin 44, the second pin, the third pin 55 and the fourth pin 56, thereby achieving electrical conduction.
[0055] Specifically, the buckle 222 includes a first buckle body 2221 and a second buckle body 2222 arranged opposite to the first buckle body 2221. The first buckle body 2221 and the second buckle body 2222 are both connected to the electrode 221 to form a clamping space, and the first pin 44, the second pin, the third pin 55 and the fourth pin 56 are respectively clamped in the clamping space. In this way, each buckle 222 can be firmly connected to the first pin 44, the second pin, the third pin 55 and the fourth pin 56.
[0056] Of course, in other embodiments, the first pin 44 , the second pin, the third pin 55 and the fourth pin 56 are respectively welded to the buckles 222 to achieve electrical conduction.
[0057] In this embodiment, the mounting base 21 is provided with a slot body 213, and the electrode 221 is installed in the slot body 213. By providing the slot body 213, the electrode 221 can be installed in the slot body 213, ensuring the coplanarity consistency of the electrode 221, so that the electrode 221 can be stably connected to the welding part of the circuit board.
[0058] In one embodiment, if Figure 5 and Figure 6 As shown, the mounting seat 21 is provided with a positioning groove 211, and the placement plate 31 is installed in the positioning groove 211, and the positioning groove 211 is used to locate the position of the placement plate 31. By providing the positioning groove 211, the placement plate 31 can be positioned, so that the position of the magnetic core 3 in the inductor is positioned to control the inductance accuracy. In addition, the positioning groove 211 is provided to facilitate the assembly of the magnetic core 3 and the mounting seat 21.
[0059] In one embodiment, if Figure 6 and Figure 7 As shown, the magnetic cover 1 is provided with a mounting groove 11, and the mounting seat 21 is provided with a positioning boss 212. During the process of enclosing the magnetic cover 1 and the mounting seat 21, the positioning boss 212 can be installed in the mounting groove 11. By providing the positioning boss 212 and the mounting groove 11, the position of the magnetic cover 1 can be positioned during the installation of the mounting seat 21 and the magnetic cover 1, thereby controlling the inductance accuracy.
[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0061] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.
Claims
1. A compact shielded coupled inductor, characterized in that: The compact shielded coupled inductor includes a magnetic cover, a base assembly, a magnetic core and a coil. The coil is flat. The base assembly includes a mounting base and a terminal connected to the mounting base. The magnetic cover and the mounting base enclose an installation space. The magnetic core includes a placement plate and a middle column connected to the placement plate. The coil includes a first flat sheet and a second flat sheet. The first flat sheet and the second flat sheet are stacked and wound to form the coil. The placement plate is installed in the installation space and is used to place the first flat sheet and the second flat sheet. The first flat sheet and the second flat sheet are both sleeved on the middle column and are both connected to the terminal.
2. The compact shielded coupled inductor according to claim 1, wherein: The first flat sheet material includes a first body, and a first lead and a second lead connected to the first body. The second flat sheet material includes a second body, and a third lead and a fourth lead connected to the second body. The first lead and the third lead are arranged at an angle, and the second lead and the fourth lead are arranged at an angle.
3. The compact shielded coupled inductor according to claim 1, wherein: The first flat sheet also includes a first pin and a second pin, and the second flat sheet also includes a third pin and a fourth pin. The first pin is connected to the first lead, the second pin is connected to the second lead, the third pin is connected to the third lead, and the fourth pin is connected to the fourth lead. There are multiple terminals, which are exposed on the outside of the magnetic cover and the mounting base. The first pin, the second pin, the third pin and the fourth pin are connected to each terminal in a one-to-one correspondence.
4. The compact shielded coupled inductor according to claim 3, wherein: The magnetic cover is provided with a first groove, and the mounting seat is provided with a second groove. During the enclosing process of the magnetic cover and the mounting seat, the first groove and the second groove form an avoidance space, which is connected to the mounting space and is used to avoid the terminal.
5. The compact shielded coupled inductor according to claim 3, wherein: The magnetic cover is further provided with a plurality of lead grooves, and the first lead, the second lead, the third lead and the fourth lead are respectively placed in the lead grooves.
6. The compact shielded coupled inductor according to claim 3, wherein: Each of the terminals includes an electrode and a clip connected to the electrode. Each of the electrodes is mounted on the mounting seat. The first pin, the second pin, the third pin and the fourth pin are respectively engaged and connected with the clip.
7. The compact shielded coupled inductor according to claim 6, wherein: The mounting seat is provided with a slot body, and the electrode is mounted in the slot body.
8. The compact shielded coupled inductor of claim 1, wherein: The axial cross section of the magnetic core is T-shaped.
9. The compact shielded coupled inductor according to claim 8, wherein: The mounting seat is provided with a positioning groove, the placement plate is installed in the positioning groove, and the positioning groove is used to locate the position of the placement plate.
10. The compact shielded coupled inductor of claim 1, wherein: The magnetic cover is provided with a mounting groove, and the mounting seat is provided with a positioning boss. During the process of enclosing the magnetic cover and the mounting seat, the positioning boss can be installed in the mounting groove.