Inductor and power factor correction circuit

Abstract

The utility model provides an inductor and a power factor correction circuit. The inductor comprises a mounting seat; the magnetic core assembly is connected to the mounting seat, and the magnetic core assembly comprises a wrapping post; the framework comprises a sleeve, and the sleeve is connected to the outer side of the wrapping post in a sleeving mode; the winding is wound on the outer side of the sleeve, a lead-in wire and a lead-out wire of the winding are connected to the mounting seat, and pouring sealant is arranged on the outer side of the winding; the metal cavity is arranged on the outer sides of the mounting seat, the magnetic core assembly, the framework and the winding in a sleeving manner; wherein the outer contour of the wrapping post is matched with the inner wall of the metal cavity. According to the inductor provided by the utility model, the total use amount of the pouring sealant can be reduced so as to reduce the cost, so that the inductor has higher power density.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, and in particular to an inductor and a power factor correction circuit. Background Art

[0002] With the rapid development of new energy vehicles, technologies related to onboard chargers are becoming increasingly important. The input of an onboard charger is connected to the power grid. For AC power from the grid, a power factor correction (PFC) circuit is added to the charger's rectifier circuit to reduce harmonics before supplying the power to the battery.

[0003] In power factor correction circuits, inductors store energy and filter ripple current. However, current inductors have a low fill rate, resulting in a loss of power density. Therefore, there is room for improvement. Utility Model Content

[0004] The utility model provides an inductor and a power factor correction circuit to solve the technical problem of low filling rate of the inductor in the prior art.

[0005] The utility model provides an inductor, comprising:

[0006] Mounting seat;

[0007] A magnetic core assembly is connected to the mounting base, wherein the magnetic core assembly includes a winding post;

[0008] The frame includes a sleeve, wherein the sleeve is sleeved and connected to the outer side of the winding post;

[0009] A winding is wound on the outside of the sleeve, the lead-in wire and the lead-out wire of the winding are connected to the mounting seat, and a potting compound is provided on the outside of the winding; and

[0010] A metal cavity is sleeved on the outside of the mounting seat, the magnetic core assembly, the frame and the winding;

[0011] Wherein, the outer contour of the winding post is adapted to the inner wall of the metal cavity.

[0012] In one embodiment of the present invention, the magnetic core assembly further comprises a magnetic core bottom cover and a magnetic core top cover, and the winding post is connected between the magnetic core top cover and the magnetic core bottom cover;

[0013] There are at least two winding poles. After the winding is completed on the sleeve outside one winding pole, the winding is wound on the sleeve outside another adjacent winding pole.

[0014] In one embodiment of the present invention, the winding post is perpendicular to the core bottom cover and the core top cover, and the outer wall of the winding post forms a step structure with the core bottom cover and the core top cover, and the outer side of the step structure is connected to the sleeve and the winding.

[0015] In one embodiment of the present invention, the edges of the winding post are chamfered, and the sleeve is adapted to fit the winding post.

[0016] In one embodiment of the present invention, the skeleton further comprises a top plate and a bottom plate, and through holes are provided on the top plate and the bottom plate, and the through holes are connected to the center hole of the sleeve.

[0017] In one embodiment of the present invention, the sleeve is perpendicular to the top plate and the bottom plate, and an outer wall of the sleeve forms a step structure with the bottom plate and the top plate, and the outer side of the step structure is connected to the winding.

[0018] In one embodiment of the present invention, protrusions are provided on the top plate and the bottom plate, and the side walls of the magnetic core bottom cover or the magnetic core top cover are in contact with the protrusions in a direction parallel to the axis of the winding column.

[0019] In one embodiment of the present invention, the protrusion of the top plate includes a top protrusion and at least two limiting portions, at least two of the limiting portions are connected to the outer side of the top protrusion, and a gap exists between two adjacent limiting portions. The lead-in wire and the lead-out wire of the winding pass through the gap and are connected to the mounting seat, and the top protrusion contacts the side wall of the magnetic core top cover;

[0020] The protrusion of the bottom plate includes a bottom protrusion and a reinforcing rib portion, the bottom protrusion contacts the side wall of the magnetic core bottom cover, and the reinforcing rib portion is connected between the bottom plate and the bottom protrusion.

[0021] In one embodiment of the present invention, in the direction of the side wall of the magnetic core top cover, the side wall of the magnetic core top cover, the outer surface of the winding, and the side wall of the magnetic core bottom cover are located in the same plane.

[0022] The utility model also provides a power factor correction circuit, comprising:

[0023] A first branch is electrically connected by the source of the first transistor and the drain of the second transistor, and the gate of the first transistor and the gate of the second transistor serve as control terminals;

[0024] a second branch electrically connected by the source of the third transistor and the drain of the fourth transistor, wherein the gate of the third transistor and the gate of the fourth transistor serve as control terminals;

[0025] a capacitor, one end of which is electrically connected to the drain of the first transistor and the drain of the third transistor, and the other end of which is electrically connected to the source of the second transistor and the source of the fourth transistor; and

[0026] Any of the above-mentioned inductors, wherein one end of the inductor is electrically connected to the source of the first transistor;

[0027] The other end of the inductor and the source of the third transistor form an input end, and the two ends of the capacitor form an output end.

[0028] Beneficial effects of the present invention: The present invention proposes an inductor and a power factor correction circuit. The inductor proposed in this application has an outer contour of the winding post that is compatible with the inner wall of the metal cavity, so that the gap between the outer contour of the winding on the winding post and the metal cavity is very small, which can reduce the overall amount of potting glue used to reduce costs.

[0029] Moreover, since the outer contour of the winding post is adapted to the inner wall of the metal cavity, the outer contour of the winding on the winding post is also adapted to the inner wall of the metal cavity. The proportion of the space volume occupied by the winding inside the metal cavity becomes larger, which can make the inductor have a higher power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A three-dimensional diagram of a winding column and potting glue provided in the prior art.

[0032] Figure 2 A top view of the winding column and potting compound provided in the prior art.

[0033] Figure 3 A top view of a winding post and potting compound provided in one embodiment of the present invention.

[0034] Figure 4 A top view of a winding post and potting compound provided in yet another embodiment of the present invention.

[0035] Figure 5 This is a schematic structural diagram of an inductor provided in one embodiment of the present utility model.

[0036] Figure 6 A three-dimensional diagram of an inductor provided in one embodiment of the present invention.

[0037] Figure 7 This is a schematic structural diagram of a magnetic core component in an inductor provided by one embodiment of the present utility model.

[0038] Figure 8 A three-dimensional diagram of a magnetic core component in an inductor provided in one embodiment of the present invention.

[0039] Figure 9 This is a schematic structural diagram of a skeleton in an inductor provided by an embodiment of the present invention.

[0040] Figure 10 A schematic structural diagram of a power factor correction circuit provided in one embodiment of the present utility model.

[0041] Explanation of the accompanying figures: 100, cylindrical winding post; 200, inductor; 300, transistor; 400, capacitor; 10, mounting base; 20, magnetic core assembly; 21, magnetic core bottom cover; 22, winding post; 23, magnetic core top cover; 24, step structure; 30, skeleton; 31, sleeve; 32, through hole; 33, top plate; 330, top plate protrusion; 331, top protrusion; 332, limiting portion; 34, bottom plate; 340, bottom plate protrusion; 341, bottom protrusion; 342, reinforcing rib; 35, gap; 40, winding; 50, metal cavity. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0043] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0044] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0045] See also Figures 1 to 10 The utility model proposes an inductor and a power factor correction circuit, which can be used in the fields of new energy vehicles, power electronics, filtering and signal processing, wireless communications, magnetic storage, motors and transformers, timing and oscillators, etc. For example, in the field of new energy vehicles, in the power factor correction (PFC) circuit of the on-board charger, the inductor can store energy and filter ripple current. The inductor proposed in this application has the advantages of reducing the overall amount of potting glue used to reduce costs, reducing product volume, and making the inductor have a higher power density. The following is a detailed description through specific embodiments.

[0046] See Figures 3 to 6 In one embodiment of the present invention, an inductor 200 is provided, which may include a mounting base 10, a magnetic core assembly 20, a bobbin 30, a winding 40, and a metal cavity 50. The mounting base 10 serves as the mounting body of the inductor 200 and may be used to mount the magnetic core assembly 20, the bobbin 30, and the winding 40.

[0047] Specifically, such as Figure 5 and Figure 6 As shown, the magnetic core assembly 20 can be connected to the mounting base 10. Figure 4 、 Figure 6 and Figure 7 As shown, the core assembly 20 may include a winding post 22. Figure 4 and Figure 8 As shown, the frame 30 may include a sleeve 31, which may be sleeved and connected to the outside of the winding post 22. The winding 40 may be wound on the outside of the sleeve 31. The lead-in and lead-out wires of the winding 40 may be connected to the mounting base 10, and potting compound may be provided on the outside of the winding 40. The winding 40 may be wound from a round enameled wire or a flat wire conductor.

[0048] Specifically, such as Figure 1 and Figure 2 As shown, in the prior art, in order to improve the problems of large size and poor heat dissipation of inductors made of ferrite materials, the advantages of high magnetic flux density and small size of magnetic powder core materials are utilized to make inductors. However, magnetic powder core materials do not have the characteristics of arbitrariness and variability of ferrite materials, and inductors made of circular magnetic powder cores have the disadvantage of low filling rate. For example, in order to ensure that the inductor can maintain normal and stable operation for a long time, it is necessary to fill the outer side of the winding on the cylindrical winding pole 100 with potting compound for heat dissipation, and the circular outer contour requires more potting compound to fill the metal cavity to be filled with potting compound, resulting in a high cost of potting compound.

[0049] like Figure 3 、 Figure 4 and Figure 5 As shown, the metal cavity 50 can be mounted on the outside of the mounting base 10, the magnetic core assembly 20, the frame 30, and the winding 40. The outer contour of the winding post 22 is adapted to the inner wall of the metal cavity 50. For example, if the metal cavity 50 is in the shape of a rectangular parallelepiped, the outer contour of the winding post 22 is also in the shape of a rectangular parallelepiped, and the outer contour of the winding 40 wound on the winding post 22 is also in the shape of a rectangular parallelepiped.

[0050] Specifically, the cross section of the winding post 22 may be rectangular, trapezoidal or other shapes, and the cross section of the winding post 22 refers to a cross section parallel to its bottom surface. Figure 4 As shown, when the cross-section of the winding post 22 is trapezoidal, the hypotenuses are opposed, so that the overall outer contour of the two winding posts 22 forms a rectangular cross-section. By matching the outer contours of the winding post 22 and the winding 40 with the inner wall of the metal cavity 50, when potting compound is filled on the outside of the winding 40 on the winding post 22, the volume of the air space between the outer contour of the winding 40 and the metal cavity 50 is small, which can significantly reduce the amount of potting compound used, thereby optimizing the overall product cost.

[0051] See also Figure 5 、 Figure 7 and Figure 8 In one embodiment of the present invention, the magnetic core assembly 20 further includes a magnetic core bottom cover 21 and a magnetic core top cover 23, and the winding post 22 can be connected between the magnetic core top cover 23 and the magnetic core bottom cover 21. The magnetic core bottom cover 21, the winding post 22 and the magnetic core top cover 23 can be made of magnetic powder core material, or ferrite material or other new magnetic materials. The number of winding posts 22 is at least two, and at least two winding posts 22 can be arranged in a straight line between the magnetic core top cover 23 and the magnetic core bottom cover 21. In other embodiments, at least two winding posts 22 can be arranged in other shapes. After the winding 40 is wound on the sleeve 31 outside a winding post 22, it is wound on the sleeve 31 outside another adjacent winding post 22.

[0052] Specifically, the core bottom cover 21, winding post 22, and core top cover 23 may be separate blocks that are connected together, or they may be integrally formed. When the core bottom cover 21, winding post 22, and core top cover 23 are separate blocks, they may be bonded together using a hard adhesive.

[0053] Specifically, such as Figure 5 、 Figure 6 and Figure 7As shown, from the perspective of the top plate 33 toward the bottom plate 34, the winding 40 starts from the lead-in wire and is wound counterclockwise on the sleeve 31 outside the top of the first winding pin 22 until the winding is completed on the first winding pin 22. After the winding 40 is wound on the sleeve 31 outside the first winding pin 22, the winding 40 extends from the bottom of the first winding pin 22 to the bottom of the second winding pin 22. The winding 40 is wound counterclockwise on the sleeve 31 outside the bottom of the second winding pin 22 until the winding is completed on the second winding pin 22. After the winding 40 is wound on the sleeve 31 outside the second winding pin 22, the winding 40 extends from the top of the second winding pin 22 to the top of the first winding pin 22, forming the lead-out wire of the winding 40.

[0054] In addition, in other embodiments, as viewed from the top plate 33 toward the bottom plate 34, the winding 40 can be wound on the sleeves 31 outside all the winding posts 22 starting from the lead-in wire, i.e., the outer contour of the winding 40 forms only a cylindrical shape. In other embodiments, as viewed from the top plate 33 toward the bottom plate 34, the winding 40 can be wound on the sleeves 31 outside several winding posts 22 starting from the lead-in wire. After the winding is completed so that the outer contour of the winding 40 forms a cylindrical shape, the winding 40 can be wound on the sleeves 31 outside several other winding posts 22, and finally the winding of the winding 40 is completed.

[0055] See also Figure 5 、 Figure 7 and Figure 8 In one embodiment of the present invention, in the magnetic core assembly 20, the winding post 22 is perpendicular to the magnetic core bottom cover 21 and the magnetic core top cover 23. A step structure 24 is formed between the outer wall of the winding post 22 and the magnetic core bottom cover 21 and the magnetic core top cover 23. The outer side of the step structure 24 is connected to the sleeve 31 and the winding 40. The step structure 24 can be formed alone in the length direction of the magnetic core bottom cover 21, or the step structure 24 can be formed alone in the width direction of the magnetic core bottom cover 21. Of course, the step structure 24 can also be formed both in the length direction and in the width direction of the magnetic core bottom cover 21.

[0056] Specifically, after the sleeve 31 and winding 40 are connected to the outside of the winding post 22, if the outer contour of the winding 40 protrudes outside the core bottom cover 21 and the core top cover 23, air will still remain outside the core bottom cover 21 and the core top cover 23 within the metal cavity filled with glue. To minimize the amount of air remaining within the metal cavity filled with glue, a step structure 24 is formed between the outer wall of the winding post 22 and the core bottom cover 21 and the core top cover 23.

[0057] Specifically, such as Figure 7 and Figure 8As shown, when there are at least two winding posts 22, the width of each winding post 22 is smaller than the width of the core bottom cover 21 and the core top cover 23 in a direction perpendicular to the at least two winding posts 22. A step structure 24 is formed between the outer wall of the winding post 22 and the core bottom cover 21 and the core top cover 23. A sleeve 31 and a winding 40 are connected to the outside of the step structure 24. When the winding 40 does not protrude beyond the core bottom cover 21 and the core top cover 23, the volume of the metal cavity for the glue filling can be kept small. By reducing the overall spatial volume of the glue-filled metal cavity, the product volume of the inductor 200 is also reduced, resulting in a higher power density for the inductor 200.

[0058] See also Figure 5 、 Figure 7 and Figure 8 In one embodiment of the present invention, in the magnetic core assembly 20, the edges of the winding post 22 are chamfered, and the sleeve 31 is adapted to the winding post 22. Figure 8 As shown, the sleeve 31 also has an arcuate structure at the position corresponding to the edge of the winding post 22. The chamfered edge of the winding post 22 prevents wear between the winding post 22 and the sleeve 31, thereby increasing the performance and service life of the winding post 22 and sleeve 31. Because the sleeve 31 is compatible with the winding post 22, the outer edge of the sleeve 31 also has an arcuate structure. When the winding 40 is wound on the sleeve 31, wear on the winding 40 is avoided, thereby ensuring that the inductor 200 can maintain normal and stable operation for a long time.

[0059] See also Figure 5 and Figure 9 In one embodiment of the present invention, the skeleton 30 further includes a top plate 33 and a bottom plate 34. Each of the top plate 33 and the bottom plate 34 defines a through hole 32, which intersects the center hole of the sleeve 31. The sleeve 31, top plate 33, and bottom plate 34 can be sleeved onto the outside of the winding post 22. The winding 40 can be positioned between the top plate 33 and the bottom plate 34 on the sleeve 31. The top plate 33 and the bottom plate 34 separate the winding post 22 and the winding 40, thereby ensuring that the skeleton 30 provides a fixed position and isolation for the winding 40.

[0060] See also Figure 5 and Figure 9 In one embodiment of the present invention, in the skeleton 30, the sleeve 31 is perpendicular to the top plate 33 and the bottom plate 34, and a step structure is formed between the outer wall of the sleeve 31 and the bottom plate 34 and the top plate 33, and the outer side of the step structure is connected to the winding 40.

[0061] Specifically, after the winding 40 is connected to the outside of the sleeve 31, if the outer contour of the winding 40 protrudes beyond the bottom cover 21 and the top cover 23 of the core, air will remain outside the bottom cover 21 and the top cover 23 of the core within the metal cavity filled with glue. To minimize the amount of air remaining within the metal cavity filled with glue, a step structure is considered to be formed between the outer wall of the sleeve 31 and the bottom plate 34 and the top plate 33.

[0062] Specifically, such as Figure 9 As shown, when there are at least two winding posts 22, the width of sleeve 31 is smaller than the widths of bottom plate 34 and top plate 33 in a direction perpendicular to the at least two winding posts 22. A step structure 24 is formed between the outer wall of sleeve 31 and bottom plate 34 and top plate 33. Winding 40 is connected to the outside of the step structure. When winding 40 does not protrude beyond the core bottom cover 21 and core top cover 23, the volume of the metal cavity for glue potting can be kept small. Reducing the overall volume of the metal cavity for glue potting also reduces the product size of inductor 200, resulting in a higher power density for inductor 200.

[0063] See also Figure 5 and Figure 9 In one embodiment of the present invention, considering that the width of the core bottom cover 21 and the core top cover 23 is greater than the width of the sleeve 31, after the winding 40 is wound on the sleeve 31, the cross-sectional area of ​​the winding 40 along the magnetic flux direction on the winding post 22 remains unchanged. Therefore, the height of the core bottom cover 21 and the core top cover 23 can be appropriately reduced along the axis of the winding post 22. This reduces the height of the entire inductor 200, resulting in a higher power density.

[0064] See also Figure 5 and Figure 9 In one embodiment of the present invention, in the skeleton 30, protrusions are provided on the top plate 33 and the bottom plate 34. For example, the top plate 33 is provided with a top plate protrusion 330, and the bottom plate 34 is provided with a bottom plate protrusion 340. In a direction parallel to the winding pole 22, the top plate protrusion 330 contacts the outer wall of the magnetic core top cover 23, and the bottom plate protrusion 340 contacts the outer wall of the magnetic core bottom cover 21.

[0065] Specifically, such as Figure 5 and Figure 9As shown, the top plate protrusion 330 includes two parts: a top protrusion 331 and a stopper 332. At least two stoppers 332 are connected to the outer side of the top protrusion 331. In a direction parallel to the winding post 22, the top protrusion 331 contacts the outer wall of the core top cover 23. In other words, the top protrusion 331 strengthens the connection between the frame 30 and the core top cover 23. In a direction perpendicular to the winding post 22, the stopper 332 contacts the top of the winding 40. In other words, the stopper 332 serves to limit the position of the winding 40. The stopper 332 contacts the top of the winding 40.

[0066] Similarly, the bottom plate protrusion 340 includes a bottom protrusion 341 and a reinforcing rib 342. In a direction parallel to the winding post 22, the bottom protrusion 341 contacts the outer wall of the magnetic core bottom cover 21, thereby reinforcing the connection between the skeleton 30 and the magnetic core top cover 23. In a direction perpendicular to the winding post 22, the reinforcing rib 342 connects between the bottom plate 34 and the bottom protrusion 341. The bottom plate 34 contacts the bottom of the winding 40, thereby reinforcing the bottom plate 34.

[0067] See also Figure 5 、 Figure 6 and Figure 9 In one embodiment of the present invention, there are at least two stoppers 332 outside the top protrusion 331, with a gap 35 between two adjacent stoppers 332. The lead-in and lead-out wires of the winding 40 are passed through the gap 35 and extend outward from the gap 35 to connect to the mounting base 10.

[0068] Specifically, such as Figure 5 、 Figure 6 and Figure 9 As shown, by providing a gap 35 between two adjacent limiting portions 332 on one side of the top protrusion 331 and arranging the lead-in wire and the lead-out wire of the winding 40 in the gap 35, positional interference between the lead-in wire and the lead-out wire of the winding 40 and the top plate 33 and the magnetic core top cover 23 can be avoided, thereby improving the compactness of the overall structure of the inductor 200.

[0069] See also Figure 5 and Figure 6 In one embodiment of the present invention, in a direction parallel to the axis of the winding post 22, the outer wall of the magnetic core top cover 23, the outer surface of the winding 40, and the outer wall of the magnetic core bottom cover 21 are located in the same plane.

[0070] Specifically, such as Figure 5 and Figure 6As shown, in a direction parallel to the axis of the winding post 22, both the core top cover 23 and the core bottom cover 21 have four outer walls. In a direction parallel to the axis of the winding post 22, for any outer wall of the core top cover 23 located in a plane, one of the outer walls of the core bottom cover 21 and a portion of the outer contour of the winding 40 also lie on that plane. Ignoring the top plate 33 and bottom plate 34, in a direction parallel to the axis of the winding post 22, the outer contours of the core top cover 23, the winding 40, and the core bottom cover 21 are continuous. In other words, by ensuring that the winding 40 does not protrude outside the core bottom cover 21 and the core top cover 23, the volume of the metal cavity for the glue filling can be reduced. By reducing the overall spatial volume of the metal cavity for the glue filling, the product volume of the inductor 200 is also reduced, resulting in a higher power density.

[0071] See also Figure 10 In one embodiment of the present invention, a power factor correction (PFC) circuit is proposed, which may include a first branch, a second branch, a capacitor 300, and an inductor 200. The first branch is electrically connected by two transistors Q1 and Q2, the source of the first transistor Q1 is electrically connected to the drain of the second transistor Q2, and the gate of the first transistor Q1 and the gate of the second transistor Q2 serve as control terminals. The second branch is electrically connected by two transistors Q3 and Q4, the source of the third transistor Q3 is electrically connected to the drain of the fourth transistor Q4, and the gate of the third transistor Q3 and the gate of the fourth transistor Q4 serve as control terminals. The capacitor 300 is connected in parallel to the first branch and the second branch, one end of the capacitor 300 is electrically connected to the drain of the first transistor Q1 and the drain of the third transistor Q3, and the other end of the capacitor 300 is electrically connected to the source of the second transistor Q2 and the source of the fourth transistor Q4.

[0072] In addition, the inductor 200 may include a base 10, a magnetic core assembly 20, a skeleton 30 and a winding 40, and the connection relationship, positional relationship, and corresponding relationship between the base 10, the magnetic core assembly 20, the skeleton 30 and the winding 40 are consistent with the specific description above. One end of the inductor 200 can be electrically connected between the two transistors Q1 and Q2 of the first branch, that is, one end of the inductor 200 is electrically connected to the source of the first transistor Q1. The other end of the inductor 200 forms an input end with the source of the third transistor Q3, and the two ends of the capacitor 300 form an output end. The above-mentioned power factor correction circuit can be applied to the power factor correction circuit scenario of the on-board charger, and can be used to reduce the harmonic components in the rectifier circuit.

[0073] In summary, the present invention proposes an inductor and a power factor correction circuit. The inductor proposed in this application can reduce the overall amount of potting glue used to reduce costs, and can reduce the product volume. The proportion of the space volume occupied by the winding inside the metal cavity is increased, so that the inductor has a higher power density.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention. As used in the description herein and throughout the claims below, unless otherwise indicated, "one", "an", and "the" include plural references. Similarly, as used in the description herein and throughout the claims below, unless otherwise indicated, the meaning of "in..." includes "in..." and "on..."

Claims

1. An inductor, characterized in that: include: Mounting seat; A magnetic core assembly is connected to the mounting base, wherein the magnetic core assembly includes a winding post; The frame includes a sleeve, wherein the sleeve is sleeved and connected to the outer side of the winding post; A winding is wound on the outside of the sleeve, the lead-in wire and the lead-out wire of the winding are connected to the mounting seat, and a potting compound is provided on the outside of the winding; and A metal cavity is sleeved on the outside of the mounting seat, the magnetic core assembly, the frame and the winding; Wherein, the outer contour of the winding post is adapted to the inner wall of the metal cavity.

2. The inductor according to claim 1, wherein: The magnetic core assembly further comprises a magnetic core bottom cover and a magnetic core top cover, and the winding post is connected between the magnetic core top cover and the magnetic core bottom cover; There are at least two winding poles. After the winding is wound on the sleeve outside one winding pole, it is wound on the sleeve outside another adjacent winding pole. The winding directions of the winding on at least two winding poles are the same.

3. The inductor according to claim 2, characterized in that The winding post is perpendicular to the core bottom cover and the core top cover respectively, and a step structure is formed between the outer wall of the winding post and the core bottom cover and the core top cover respectively, and the outer side of the step structure is connected to the sleeve and the winding.

4. The inductor according to any one of claims 1 to 3, characterized in that: The edges of the winding post are provided with chamfers, and the sleeve is adapted to the winding post.

5. The inductor according to claim 2, wherein: The skeleton further comprises a top plate and a bottom plate. Through holes are formed on the top plate and the bottom plate, and the through holes are connected to the central hole of the sleeve.

6. The inductor according to claim 5, characterized in that The sleeve is perpendicular to the top plate and the bottom plate. A step structure is formed between the outer wall of the sleeve and the bottom plate and the top plate. The outer side of the step structure is connected to the winding.

7. The inductor according to claim 6, characterized in that The top plate and the bottom plate are provided with protrusions, and the side walls of the magnetic core bottom cover or the magnetic core top cover are in contact with the protrusions in a direction parallel to the axis of the winding column.

8. The inductor according to claim 7, characterized in that: The protrusion of the top plate includes a top protrusion and at least two limiting portions, at least two of the limiting portions are connected to the outer side of the top protrusion, and there is a gap between two adjacent limiting portions. The lead-in wire and the lead-out wire of the winding pass through the gap and are connected to the mounting seat. The top protrusion contacts the side wall of the magnetic core top cover; The protrusion of the bottom plate includes a bottom protrusion and a reinforcing rib portion, the bottom protrusion contacts the side wall of the magnetic core bottom cover, and the reinforcing rib portion is connected between the bottom plate and the bottom protrusion.

9. The inductor according to claim 3 or 6, characterized in that: In a direction parallel to the winding column axis, the outer wall of the magnetic core top cover, the outer surface of the winding, and the outer wall of the magnetic core bottom cover are located in the same plane.

10. A power factor correction circuit, characterized in that: include: A first branch is electrically connected by the source of the first transistor and the drain of the second transistor, and the gate of the first transistor and the gate of the second transistor serve as control terminals; a second branch electrically connected by the source of the third transistor and the drain of the fourth transistor, wherein the gate of the third transistor and the gate of the fourth transistor serve as control terminals; a capacitor, one end of which is electrically connected to the drain of the first transistor and the drain of the third transistor, and the other end of which is electrically connected to the source of the second transistor and the source of the fourth transistor; as well as The inductor according to any one of claims 1 to 9, wherein one end of the inductor is electrically connected to the source of the first transistor; The other end of the inductor and the source of the third transistor form an input end, and the two ends of the capacitor form an output end.

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