Insulation integrated potting inverter power inductor with low temperature rise
By using the combination of magnetic cores and high-thermal heat dissipation parts in the aluminum shell in differential mode inductors, the problem of inductor temperature rise is solved, and low-temperature rise, efficient heat dissipation and low-cost power inductor design are achieved.
Patent Information
- Application Number
- CN202421062547.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-16
AI Technical Summary
The existing differential mode inductors have a higher temperature rise during operation, resulting in increased costs.
Aluminum shell is equipped with a magnetic core. The magnetic core is composed of the upper jaw, the lower jaw and the middle column magnetic core. The heat dissipation parts are fixed on both sides and closely matched with the aluminum shell. The heat dissipation parts wrap the coil. The coil is equipped with isolation plates, magnetic core and heat dissipation. The parts are made of ferrosilicon or ferrosilicon aluminum, and the heat dissipation parts are made of 95 alumina ceramic material, with high thermal conductivity.
Under the same inductance volume, the effects of low temperature rise, low loss and low cost are achieved.
Smart Images
Figure CN222260748U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electronic components, and in particular relates to a low-temperature-elevated insulation-integrated potting inverter power inductor. Background Art
[0002] Differential mode inductor, an inductor with significantly increased inductive reactance to differential mode high-frequency interference, is also called differential mode choke coil. Its core materials are rich and varied, among which Sendust magnetic powder core has become the first choice for civilian differential mode inductor production due to its lowest unit volume cost. However, this material has a large iron loss, and the temperature rise is obvious when the inductor is working. Relatively speaking, although the unit volume cost of low iron loss FeNi 50 and FeNiMo magnetic powder cores is higher, they have shown irreplaceable advantages in military and some occasions with strict requirements on volume and performance.
[0003] In the application of AC, the performance of differential mode inductance is particularly critical. When the frequency of AC remains constant, the greater the inductance, the stronger the resistance to AC; conversely, the smaller the inductance, the weaker the resistance. When the inductance remains constant, the frequency of AC is proportional to the resistance of the inductor. The higher the frequency, the stronger the resistance; the lower the frequency, the weaker the resistance. Therefore, the inductor has the characteristic of blocking AC and allowing DC. The ideal inductor is pure and flawless, without capacitance to allow AC to pass, and without resistance to allow DC to pass, and has no loss, and can completely block the passage of AC.
[0004] However, in the actual production of inductors, the traditional approach is to use a combination of heterogeneous block cores, which are then placed in an aluminum shell and potted with thermally conductive glue. Although this method can achieve heat dissipation of the inductor, the thermal conductivity of the thermally conductive silicone is low, usually only in the range of 0.8 to 2.0W, which makes it difficult to effectively remove the heat inside the middle column of the inductor core, resulting in a high temperature rise of the inductor. In order to solve this problem, it is usually necessary to reduce the operating conditions of the inductor to meet the temperature rise requirements, or to choose to use silicone with higher thermal conductivity and lower loss magnetic materials. However, these solutions will increase the cost of the inductor, which is not conducive to the low-cost production of the inductor.
[0005] To this end, the utility model provides a low-temperature-elevated insulation-integrated potted inverter power inductor. Utility Model Content
[0006] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a low temperature rise insulation integrated potted inverter power inductor, which has the advantages of low temperature rise, low loss and low cost under the same inductor volume.
[0007] The purpose of the utility model can be achieved through the following technical solutions:
[0008] A low-temperature-rising insulation integrated potted inverter power inductor, comprising an aluminum shell, an inductor is installed inside the aluminum shell, the inductor is provided with a magnetic core, the magnetic core includes an upper jaw magnetic core and a lower jaw magnetic core, the upper jaw magnetic core and the lower jaw magnetic core are connected by two groups of middle column magnetic cores, and the magnetic core has a "mouth"-shaped magnetic core structure;
[0009] Heat dissipation components are fixed on the left and right sides of the upper jaw magnetic core, the lower jaw magnetic core and the two groups of middle column magnetic cores, and the heat dissipation components are also in close contact with the aluminum shell. The two groups of middle column magnetic cores and the heat dissipation components are wrapped with a coil, and isolation plates are provided at the upper and lower ends of the coil.
[0010] As a further preferred technical solution of the present invention, the cross-section of the upper jaw magnetic core and the lower jaw magnetic core is in a racetrack shape or a rectangular shape.
[0011] As a further preferred technical solution of the present invention, the cross-section of the middle column magnetic core is in a circular shape or an oval shape.
[0012] As a further preferred technical solution of the present invention, the outer contour of the isolation plate is in a racetrack shape or a rectangular shape, and two groups of circular or oval through holes for nesting with the middle column magnetic cores are also provided on the isolation plate.
[0013] As a further preferred technical solution of the present invention, first heat dissipation parts are provided at both ends of the heat dissipation component, the first heat dissipation parts are in a rectangular shape, the inner side surface of the first heat dissipation part is in close contact with the upper jaw magnetic core or the lower jaw magnetic core, the outer side surface of the first heat dissipation part is in close contact with the aluminum shell, the middle part of the heat dissipation component is set as a second heat dissipation part, the second heat dissipation part is in a rectangular shape, the inner side surface of the second heat dissipation part is in close contact with the middle column magnetic core, the thickness of the first heat dissipation part is greater than that of the second heat dissipation part, and the cross-section of the heat dissipation component has a "U"-shaped heat dissipation structure.
[0014] As a further preferred technical solution of the present invention, the aluminum shell is provided with a receiving cavity with a front-side opening for loading the inductor, the outer contour of the receiving cavity is similar to the outer contour of the inductor for fitting, an arc-shaped protrusion similar to the outer contour of the inductor is also provided at the bottom of the receiving cavity, a circular groove is provided on the peripheral edge of the front-side opening of the aluminum shell, connection holes or connection protrusions are provided at the four inner corners of the circular groove, and fins are densely arranged on the outer surface of the aluminum shell.
[0015] As a further preferred technical solution of the present invention, the upper jaw magnetic core, the lower jaw magnetic core and the middle column magnetic core are integrally formed by iron silicon or iron silicon aluminum, and a single-component epoxy resin adhesive is used to fix between the upper jaw magnetic core and the middle column magnetic core, and a single-component epoxy resin adhesive is also used to fix between the lower jaw magnetic core and the middle column magnetic core.
[0016] As a further preferred technical solution of the present invention, the heat dissipation component is an integrally formed part made of 95 alumina ceramic material.
[0017] As a further preferred technical solution of the present invention, the coil is made of two layers of NOMEX material, and the coil is vertically wound with a flat wire.
[0018] As a further preferred technical solution of the present invention, the isolation board is an epoxy FR4 board.
[0019] As described above, the low temperature rise insulation integrated potting inverter power inductor provided by the utility model has the following beneficial effects:
[0020] The utility model utilizes the above-mentioned low-temperature rising insulation integrated potted inverter power inductor. Compared with the prior art, due to the use of such a structure, the left and right sides of the upper jaw magnetic core, the lower jaw magnetic core and the two groups of middle column magnetic cores are fixed with a heat sink, and the heat sink is also in close contact with the aluminum shell. The heat generated by the upper jaw magnetic core, the lower jaw magnetic core and the two groups of middle column magnetic cores during operation is transferred to the aluminum shell through the heat sink for heat dissipation, and the heat sink is in direct contact with the aluminum shell to better transfer heat, and the upper jaw magnetic core, the lower jaw magnetic core and the middle column magnetic core are an integrated part made of iron silicon or iron silicon aluminum, and the heat sink is an integrated part made of 95 alumina ceramic material. Therefore, the low-temperature rising insulation integrated potted inverter power inductor of the utility model has the advantages of low temperature rise, low loss and low cost under the same inductor volume.
[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] 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 labor.
[0023] Figure 1 This is a schematic diagram of the structure of a low-temperature-rising insulation-integrated potted inverter power inductor applied for by the utility model;
[0024] Figure 2 This is a schematic diagram of the aluminum shell structure of a low-temperature-rising insulation-integrated potted inverter power inductor applied for by the utility model;
[0025] Figure 3 This is a schematic diagram of the inductor structure of a low-temperature-rising insulation-integrated potted inverter power inductor applied for by the utility model;
[0026] Figure 4 This is a schematic diagram of the core structure of a low-temperature-rising insulation-integrated potted inverter power inductor applied for by the utility model;
[0027] Figure 5 This is a schematic diagram of the heat sink structure of a low-temperature-rising insulation-integrated potted inverter power inductor applied for by the utility model;
[0028] Figure 6 This is a schematic diagram of the isolation board structure of a low-temperature rising insulation integrated potted inverter power inductor applied for by the utility model.
[0029] Summary of Figure Numbers:
[0030] 100, aluminum shell; 110, accommodating chamber; 120, arc-shaped protrusion; 130, annular groove; 140, connecting hole; 150, connecting protrusion; 160, fin; 200, inductor; 300, magnetic core; 310, upper magnetic core; 320, lower magnetic core; 330, middle column magnetic core; 400, heat sink; 410, first heat dissipation part; 420, second heat dissipation part; 500, coil; 600, isolation plate; 610, through hole. DETAILED DESCRIPTION
[0031] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of the implementation of this utility model. The specific structure can be described with reference to the drawings of the patent application.
[0033] The utility model provides a low temperature rise insulation integrated potting inverter power inductor, please refer to Figures 1 to 6As shown, it includes an aluminum shell 100, an inductor 200 is installed inside the aluminum shell 100, a magnetic core 300 is provided on the inductor 200, the magnetic core 300 includes an upper jaw magnetic core 310 and a lower jaw magnetic core 320, the upper jaw magnetic core 310 and the lower jaw magnetic core 320 are connected by two groups of middle column magnetic cores 330, and the magnetic core 300 has a "mouth"-shaped magnetic core structure;
[0034] A heat sink 400 is fixed on the left and right sides of the upper jaw magnetic core 310, the lower jaw magnetic core 320 and the two groups of middle column magnetic cores 330. The heat sink 400 is also in close contact with the aluminum shell 100. A coil 500 is wound around the two groups of middle column magnetic cores 330 and the heat sink 400. Isolation plates 600 are provided at the upper and lower ends of the coil 500. The heat generated by the upper jaw magnetic core 310, the lower jaw magnetic core 320 and the two groups of middle column magnetic cores 330 during operation is transferred to the aluminum shell 100 for heat dissipation through the heat sink 400, and the direct contact between the heat sink 400 and the aluminum shell 100 can better transfer heat.
[0035] Specifically, the specific structures of the upper jaw magnetic core 310 and the lower jaw magnetic core 320 are as follows. Referring to Figure 4 As shown, in this embodiment, the cross-sections of the upper jaw magnetic core 310 and the lower jaw magnetic core 320 are in a racetrack shape or a rectangular shape.
[0036] Specifically, the specific structure of the middle column magnetic core 330 is as follows. Referring to Figure 4 As shown, in this embodiment, the cross-section of the middle column magnetic core 330 is in a circular shape or an oval shape.
[0037] Specifically, the specific structure of the isolation plate 600 is as follows. Referring to Figure 6 As shown, in this embodiment, the outer contour of the isolation plate 600 is in a racetrack shape or a rectangular shape, and two groups of circular or oval through holes 610 for nesting with the middle column magnetic core 330 are opened on the isolation plate 600.
[0038] Specifically, the specific structure of the heat sink 400 is as follows. Referring to Figure 5 As shown, in this embodiment, the two ends of the heat sink 400 are provided with first heat dissipation parts 410. The first heat dissipation parts 410 are in a rectangular shape. The inner side surfaces of the first heat dissipation parts 410 are in close contact with the upper jaw magnetic core 310 or the lower jaw magnetic core 320. The outer side surfaces of the first heat dissipation parts 410 are in close contact with the aluminum shell 100. The middle part of the heat sink 400 is a second heat dissipation part 420. The second heat dissipation part 420 is in a rectangular shape. The inner side surface of the second heat dissipation part 420 is in close contact with the middle column magnetic core 330. The thickness of the first heat dissipation part 410 is greater than that of the second heat dissipation part 420. The cross-section of the heat sink 400 has a "U"-shaped heat dissipation structure.
[0039] Specifically, the specific structure of the aluminum shell 100 is as follows. Referring to Figure 2 As shown, in this embodiment, the aluminum shell 100 is provided with a accommodating chamber 110 with a front opening for loading the inductor 200, the outer contour of the accommodating chamber 110 is similar to the outer contour of the inductor 200, and the bottom of the accommodating chamber 110 is also provided with an arc-shaped protrusion 120 similar to the outer contour of the inductor 200. An annular groove 130 is provided on the outer peripheral edge of the front opening of the aluminum shell 100, and the inner four corners of the annular groove 130 are provided with connecting holes 140 or connecting protrusions 150. The outer surface of the aluminum shell 100 is densely covered with neatly arranged fins 160.
[0040] In this embodiment, the upper magnetic core 310, the lower magnetic core 320 and the middle magnetic core 330 are an integral part made of iron silicon or iron silicon aluminum. The upper magnetic core 310 and the middle magnetic core 330 are fixed with epoxy resin single-component glue, and the lower magnetic core 320 and the middle magnetic core 330 are also fixed with epoxy resin single-component glue.
[0041] In this embodiment, the heat sink 400 is an integrated piece made of 95% alumina ceramic material.
[0042] It should be noted that after precise spray granulation, isostatic pressing and high-temperature sintering, alumina micropowder is used to create high-performance alumina ceramic parts. This kind of ceramic parts have attracted much attention for their excellent hardness, wear resistance and corrosion resistance. It is widely used as a grinding medium in various mills such as ball mills, vibration mills, planetary mills and stirred mills, showing excellent performance. In particular, 95 alumina ceramics have extremely low wear rate, materials are not easy to adhere, have a long service life, and have extremely high grinding efficiency; while 95 ceramic parts are carefully made by hot pressing slurry molding technology and sintering at a high temperature of 1500℃. It is not only resistant to high temperatures, but also has high thermal conductivity, excellent mechanical strength, excellent insulation performance, high electrical strength and excellent chemical stability. It is particularly worth mentioning that its thermal conductivity is as high as 25.5W / mK, which ensures its efficient heat dissipation in various application scenarios.
[0043] In this embodiment, the coil 500 is made of two layers of NOMEX material, and the coil 500 is vertically wound using a flat wire.
[0044] In this embodiment, the isolation board 600 is an epoxy FR4 board.
[0045] When assembling the low temperature rise insulation integrated potting inverter power inductor of the utility model application, refer to Figures 1 to 6As shown, first, the heat sink 400 is closely attached to the middle column magnetic core 330 for assembly, and the middle column magnetic core 330 and the heat sink 400 are wrapped with two layers of NOMEX coils 500, and are vertically wound with flat wires. Then, an epoxy FR4 board is added above and below the coil 500 to isolate the coil 500 from the upper and lower magnetic cores 310 and 320, and then the upper and lower magnetic cores 310 and the middle column magnetic core 330 are spliced, and the lower and lower magnetic cores 320 are also spliced with the middle column magnetic core 330. The upper and lower magnetic cores 310 and 320 are fixed to the middle column magnetic core 330 with single-component epoxy resin glue. The heat sink 400 and the middle column magnetic core 330 are closely attached and extended to the aluminum shell 100 to transfer heat. After assembly, they are installed in the aluminum shell 100 and filled with thermal conductive glue.
[0046] As described above, the low temperature rise insulation integrated potting inverter power inductor provided by the utility model has the following beneficial effects:
[0047] The utility model utilizes the above-mentioned low-temperature rising insulation integrated potting inverter power inductor. Compared with the prior art, due to the use of such a structure, the upper jaw magnetic core 310, the lower jaw magnetic core 320 and the two groups of middle column magnetic cores 330 are fixed with a heat sink 400 on the left and right sides, and the heat sink 400 is also in close contact with the aluminum shell 100. The heat generated by the upper jaw magnetic core 310, the lower jaw magnetic core 320 and the two groups of middle column magnetic cores 330 during operation is transferred to the aluminum shell 100 through the heat sink 400 for heat dissipation, and the heat sink 400 is in direct contact with the aluminum shell 100 to better transfer heat, and the upper jaw magnetic core 310, the lower jaw magnetic core 320 and the middle column magnetic core 330 are an integrated part made of iron silicon or iron silicon aluminum, and the heat sink 400 is an integrated part made of 95 alumina ceramic material. Therefore, the low-temperature rising insulation integrated potting inverter power inductor of the utility model has the advantages of low temperature rise, low loss and low cost under the same inductor volume of 200.
[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A low temperature rising insulation integrated potting inverter power inductor, characterized in that: It includes an aluminum shell, an inductor is installed inside the aluminum shell, the inductor is provided with a magnetic core, the magnetic core includes an upper jaw magnetic core and a lower jaw magnetic core, the upper jaw magnetic core and the lower jaw magnetic core are connected by two groups of middle column magnetic cores, and the magnetic core has a "mouth"-shaped magnetic core structure; Heat dissipation components are fixed on the left and right sides of the upper jaw magnetic core, the lower jaw magnetic core and the two groups of middle column magnetic cores, and the heat dissipation components are also in close contact with the aluminum shell. The two groups of middle column magnetic cores and the heat dissipation components are wound with a coil, and isolation plates are provided at the upper and lower ends of the coil.
2. The low temperature rise insulation integrated potted inverter power inductor according to claim 1 is characterized in that: The cross-sections of the upper jaw magnetic core and the lower jaw magnetic core are in a racetrack shape or a rectangular shape.
3. The low temperature rise insulation integrated potted inverter power inductor according to claim 1 is characterized in that: The cross-section of the middle column magnetic core is in a circular shape or an oval shape.
4. The low temperature rise insulation integrated potted inverter power inductor according to claim 1 is characterized in that: The outer contour of the isolation plate is in a racetrack shape or a rectangular shape, and two groups of circular or oval through holes for nesting with the middle column magnetic cores are also opened on the isolation plate.
5. The low temperature rise insulation integrated potted inverter power inductor according to claim 1, characterized in that: The two ends of the heat dissipation component are provided with first heat dissipation parts, the first heat dissipation parts are rectangular, the inner side surface of the first heat dissipation part is in close contact with the upper jaw magnetic core or the lower jaw magnetic core, the outer side surface of the first heat dissipation part is in close contact with the aluminum shell, the middle part of the heat dissipation component is set as a second heat dissipation part, the second heat dissipation part is rectangular, the inner side surface of the second heat dissipation part is in close contact with the middle column magnetic core, the thickness of the first heat dissipation part is greater than that of the second heat dissipation part, and the cross-section of the heat dissipation component has a "U"-shaped heat dissipation structure.
6. The low temperature rise insulation integrated potted inverter power inductor according to claim 1, characterized in that: The aluminum shell is provided with a front-side open accommodation chamber for loading the inductor. The outer contour of the accommodation chamber is similar to and fitted with the outer contour of the inductor. An arc-shaped protrusion similar to and fitted with the outer contour of the inductor is also provided at the bottom of the accommodation chamber. A circular groove is opened on the peripheral edge of the front-side opening of the aluminum shell, and connection holes or connection protrusions are provided at the four inner corners of the circular groove. The outer surface of the aluminum shell is densely covered with neatly arranged fins.
7. A low temperature rise insulation integrated potted inverter power inductor according to any one of claims 1 to 6, characterized in that: The upper jaw magnetic core, the lower jaw magnetic core and the middle column magnetic core are integrally formed by iron silicon or iron silicon aluminum. The upper jaw magnetic core and the middle column magnetic core are fixed by dotting a single-component epoxy resin glue, and the lower jaw magnetic core and the middle column magnetic core are also fixed by dotting a single-component epoxy resin glue.
8. A low temperature rise insulation integrated potted inverter power inductor according to any one of claims 1 to 6, characterized in that: The heat dissipation component is an integrally formed part made of 95 alumina ceramic material.
9. A low temperature rise insulation integrated potted inverter power inductor according to any one of claims 1 to 6, characterized in that: The coil is made of two layers of NOMEX material and is wound vertically with flat wire.
10. A low temperature rise insulation integrated potted inverter power inductor according to any one of claims 1 to 6, characterized in that: The isolation plate is an epoxy FR4 board.