Resonant inductor and charging device

Abstract

The utility model provides a resonant inductor and charging equipment, and relates to the technical field of new energy, the resonant inductor comprises a magnetic core, a winding and a fixing frame corresponding to the magnetic core, and the magnetic core comprises a magnetic core middle column and a plurality of magnetic core side columns; the fixing frame is arranged on the outer side of the magnetic core middle column in a surrounding mode and located in the space between the magnetic core middle column and the magnetic core side columns, and the winding is wound on the fixing frame. A plurality of through holes are formed in the fixing frame. According to the technical scheme provided by the invention, on the basis of the resonant inductor obtained based on the small-size magnetic core design, ventilation and heat dissipation of each winding can be enhanced through the plurality of through holes, so that the heat dissipation effect of the resonant inductor can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy, and particularly relates to a resonant inductor and a charging device. BACKGROUND

[0002] With the continuous development of electric vehicles (hereinafter referred to as electric vehicles), charging piles for charging electric vehicles are gradually popularized, and the charging piles can include a charging module and a charging interface.

[0003] In the related art, the size of the LLC transformer, which is a core component of the charging module, affects the size of the charging module. The LLC transformer is usually formed by a resonant inductor winding and a main transformer.

[0004] However, due to the small size of the charging module, the LLC transformer is also designed with a small-size magnetic core, which greatly affects the heat dissipation of the LLC transformer and its internal resonant inductor. Invention content

[0005] The application provides a resonant inductor and a charging device, which solves the problem that in the prior art, due to the small size of the charging module, the LLC transformer is also designed with a small-size magnetic core, which greatly affects the heat dissipation of the LLC transformer and its internal resonant inductor.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0007] In a first aspect, the application provides a resonant inductor, which comprises a magnetic core, a winding and a fixing frame corresponding to the magnetic core, the magnetic core comprises a magnetic core middle column and a plurality of magnetic core side columns;

[0008] The fixing frame is arranged around the outside of the magnetic core middle column and located in the space between the magnetic core middle column and the magnetic core side columns, and the winding is wound on the fixing frame.

[0009] A plurality of through holes are arranged on the fixing frame.

[0010] Optionally, the magnetic core is provided with a magnetic yoke at each end, and the plane where each magnetic yoke is located is perpendicular to the axis of the magnetic core.

[0011] Each magnetic yoke is provided with at least one heat dissipation groove, and the heat dissipation groove is located at the edge of the magnetic yoke.

[0012] Optionally, the area where the magnetic yoke contacts the magnetic core middle column is provided with a groove, and the groove is connected with the edge of the heat dissipation groove.

[0013] Optionally, the magnetic core middle column comprises: a plurality of middle column segments, the plurality of middle column segments are connected by a heat conduction sheet, and the center points of the cross sections of each of the middle column segments coincide.

[0014] Optionally, the heat conduction sheet is made of at least one of a ceramic substrate, a heat conduction silicon sheet, and a vacuum cavity heat plate.

[0015] Optionally, the heat conduction sheet does not intersect or coincide with the areas where the plurality of through holes of the fixing frame are located in the projection of the fixing frame.

[0016] Optionally, the size of the air gap formed by the heat conduction sheet in the magnetic core middle column is less than or equal to a pre-set air gap threshold.

[0017] Optionally, at least one of the magnetic core side columns is provided with a ventilation groove for heat dissipation of the winding.

[0018] Optionally, the through hole of the fixing frame is located in the projection of the winding.

[0019] In a second aspect, an embodiment of the present application provides a charging device, the charging device comprising: a charging module, a charging interface, and a power distribution unit, the charging module comprising the resonant inductor of any one of the first aspect;

[0020] The charging module is configured to supply power to the power distribution unit;

[0021] The power distribution unit is configured to adjust the charging power when the charging module is powered, and supply power to the charging interface according to the adjusted charging power;

[0022] The charging interface is configured to charge the device according to the adjusted charging power.

[0023] An embodiment of the present application provides a resonant inductor, comprising: a magnetic core, a winding, and a fixing frame corresponding to the magnetic core, the magnetic core comprising: a magnetic core middle column and a plurality of magnetic core side columns. The fixing frame is arranged outside the magnetic core middle column and in the space between the magnetic core middle column and the magnetic core side columns, and the winding is wound on the fixing frame. The fixing frame can be provided with a plurality of through holes, and on the basis of the transformer designed based on a small-size magnetic core, the ventilation and heat dissipation of the winding can be enhanced through the plurality of through holes, so that the heat dissipation effect of the resonant inductor can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A device schematic diagram corresponding to a charging device in which a charging module of a resonant inductor provided by an embodiment of the present application is located;

[0025] Figure 2 A structure schematic diagram of a resonant inductor provided by an embodiment of the present application;

[0026] Figure 3 A structural schematic diagram of a magnetic core provided for an embodiment of the present application is shown in FIG. 1.

[0027] Figure 4 A structural schematic diagram of another resonant inductor provided for an embodiment of the present application is shown in FIG. 2.

[0028] Figure 5 A structural schematic diagram of another magnetic core provided for an embodiment of the present application is shown in FIG. 3.

[0029] Figure 6 A structural schematic diagram of another magnetic core provided for an embodiment of the present application is shown in FIG. 4.

[0030] Figure 7 A structural schematic diagram of another magnetic core provided for an embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0031] In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, algorithms, and electronic devices are omitted so as not to obscure the description of the present application.

[0032] The terminology used in the following description merely describes specific embodiments of the application and is not intended to limit the application. As used in the specification and the appended claims, the singular forms "a," "the," "said," and "that" are intended to include both singular and plural forms, unless the context clearly indicates otherwise.

[0033] With the continuous development of electric vehicles (hereinafter referred to as electric vehicles), charging piles for charging electric vehicles are gradually popularized. The charging pile can include a charging module, a charging interface, and the like.

[0034] In the related art, the size of the LLC transformer, which is a core component of the charging module, affects the size of the charging module. The LLC transformer is usually formed by combining a resonant inductor winding and a main transformer.

[0035] However, due to the small size of the charging module, the LLC transformer is also designed with a small-size magnetic core, which greatly affects the heat dissipation of the LLC transformer.

[0036] Therefore, the resonant inductor provided in the embodiment of the present application comprises: a magnetic core, a winding and a fixing frame corresponding to the magnetic core. The magnetic core comprises: a magnetic core middle column and a plurality of magnetic core side columns. The fixing frame is arranged outside the magnetic core middle column and located in the space between the magnetic core middle column and the magnetic core side columns, and the winding is wound on the fixing frame. A plurality of through holes can be arranged on the fixing frame. On the basis of the transformer designed based on the small-size magnetic core, the ventilation and heat dissipation of the winding can be enhanced through the plurality of through holes, so that the heat dissipation effect of the resonant inductor can be improved.

[0037] Referring to Figure 1 , Figure 1 The device schematic diagram corresponding to the charging device in which the charging module involved in the resonant inductor provided in the embodiment of the present application is located can comprise: a charging module 10, a charging interface 20 and a power distribution unit 30.

[0038] The charging module 10 can comprise: a resonant inductor 11.

[0039] Moreover, the power distribution unit 30 is connected with the charging module 10 and the charging interface 20.

[0040] Correspondingly, the charging module 10 can output the adjusted voltage through the transformer in which the resonant inductor 11 is located, so as to supply power to the power distribution unit 30. The power distribution unit 30 can adjust the charging power when supplying power to the charging module 10, and supply power to the charging interface 20 according to the adjusted charging power. The charging interface 20 can charge the device according to the adjusted charging power, that is, the charging device 10 can charge the electric vehicle through the charging interface 20.

[0041] It should be noted that in actual application, the charging device can be a charging pile or other devices capable of charging, and the type of the charging device is not limited in the embodiment of the present application. In addition, the electric vehicle is taken as an example for description in the embodiment of the present application, and in actual application, the charging device can also charge the electric bicycle, the electric motorcycle or other electric travel devices, and the embodiment of the present application does not make specific limitation on this.

[0042] The resonant inductor in the charging module is described in detail below.

[0043] Figure 2 The structural schematic diagram of the resonant inductor provided in the embodiment of the present application is shown in Figure 3 The structural schematic diagram of the magnetic core provided in the embodiment of the present application is shown in Figure 2 and Figure 3 The resonant inductor can comprise: a magnetic core 210, a winding 220 and a fixing frame 230 corresponding to the magnetic core, wherein the magnetic core 210 can comprise: a magnetic core middle column 211 and a plurality of magnetic core side columns 212.

[0044] Specifically, the fixing frame 230 can be arranged around the outer side of the magnetic core middle column 211, and located in the space between the magnetic core middle column 211 and the magnetic core side column 212. Correspondingly, the winding 220 can be wound on the fixing frame 230, so that the winding 220 is wound on the outer side of the magnetic core middle column 211 and does not contact the magnetic core middle column 211.

[0045] Moreover, the fixing frame 230 can be provided with a plurality of through holes 2301, and the air flow on the surface of the winding 220 can be strengthened through the plurality of through holes 2301, so that the air on the surface of the winding 220 can flow quickly, thereby cooling the winding 220.

[0046] Further, referring to Figure 4 , Figure 4 Another structure diagram of the resonant inductance provided by the embodiment of the present application is provided, the projection of the through hole 2301 of the fixing frame 230 on the winding 220 is located in the winding 220, that is, the through hole 2301 of the fixing frame 230 is located directly above the winding 220, which can further strengthen the air flow effect on the surface of the winding 220, thereby strengthening the cooling effect of the through hole 2301 on the winding 220.

[0047] It should be noted that in actual application, the structure of the magnetic core 210 can be further adjusted to improve the cooling effect of the resonant inductance. Referring to Figure 3 , at least one magnetic core side column 212 can be provided with a ventilation groove 212a for cooling the winding 220. On the basis of cooling the winding 220 through the plurality of through holes 2301 of the fixing frame 230, further cooling the winding 220 through the ventilation groove 212a can further improve the cooling effect of the winding 220.

[0048] In an optional embodiment, referring to Figure 5 , Figure 5 Another structure diagram of the magnetic core provided by the embodiment of the present application is provided, the magnetic core middle column 211 can include: a plurality of middle column segments 211a, and the plurality of middle column segments 211a are connected through heat conduction sheets 211b, that is, the magnetic core middle column 211 can be composed of a plurality of middle column segments 211a.

[0049] For example, the magnetic core middle column 211 can be formed by connecting three middle column segments 211a through two heat conduction sheets 211b.

[0050] The heat conduction sheet 211b can be composed of at least one of ceramic substrate, heat conduction silicon sheet and vacuum cavity heat plate. Correspondingly, each middle column segment 211a can transmit heat to other middle column segments 211a through the heat conduction sheet 211b, so that the magnetic core middle column 211 can maintain thermal equilibrium.

[0051] Further, the cross section of the magnetic core column 211 can be circular, square, rectangular or other regular shape, and the cross section of each column segment 211a is consistent with the cross section of the magnetic core column 211, and the center point of the cross section of each column segment 211a coincides.

[0052] In addition, referring to Figure 6 , Figure 6 Another structure diagram of the magnetic core provided by the embodiment of the present application is shown in FIG. 13. The projection of the heat conduction sheet 211b does not intersect or coincide with the area where the plurality of through holes 2301 of the fixing frame 230 are located, that is, the area of the fixing frame 230 where no through hole 2301 is arranged covers the area where the heat conduction sheet 211b is located, so that the eddy current generated due to the magnetic leakage of the area where the heat conduction sheet 211b is located can be reduced, and the influence of the temperature increase of the winding 220 and the influence of the heating of the winding 220 can be reduced.

[0053] It should be noted that in actual application, the size of the air gap formed by the heat conduction sheet 211b can be controlled according to actual needs, so that the size of the air gap formed by the heat conduction sheet 211b in the magnetic core column 211 is less than or equal to the pre-set air gap threshold. For example, according to actual needs, the air gap threshold can be 0.5 mm, and the size of the air gap formed by each heat conduction sheet 211b is less than or equal to 0.5 mm. The size of the air gap formed by the heat conduction sheet 211b is not limited in the embodiment of the present application.

[0054] In an optional embodiment, referring to Figure 7 , Figure 7 Another structure diagram of the magnetic core provided by the embodiment of the present application is shown in FIG. 14. The two ends of the magnetic core 210 can be provided with a magnetic yoke 213, and the plane where each magnetic yoke 213 is located is perpendicular to the axis of the magnetic core 210. Each magnetic yoke 213 can be provided with at least one heat dissipation groove 2131, and the heat dissipation groove 2131 is located at the edge of the magnetic yoke 213.

[0055] The ratio between the area of the heat dissipation groove 2131 and the area of the magnetic yoke 213 can be determined according to the actual required magnetic flux density, and the ratio is not limited in the embodiment of the present application.

[0056] As shown in Figure 7 , the edge of the heat dissipation groove 2131 close to the center of the magnetic yoke 213 is parallel to the edge of the magnetic yoke 213, thereby forming a planar vent, which can effectively reduce the wind resistance of the resonant inductor, thereby improving the ventilation effect of the resonant inductor to improve the heat dissipation effect of the resonant inductor.

[0057] Further, referring to Figure 7The area where the magnetic yoke 213 contacts the magnetic core middle column 211 can be provided with a groove 2132, which can be connected with the edge of the heat dissipation groove 2131, so that a larger heat dissipation area can be formed, so that the winding 220 can be cooled through the heat dissipation groove 2131, and the magnetic core middle column 211 of the magnetic core 210 can also be cooled through the groove 2142, thereby improving the heat dissipation effect of the resonant inductor.

[0058] It should be noted that, in actual application, in order to further improve the heat dissipation effect, the shape of the magnetic core middle column 211 can be adjusted, that is, a groove is also provided on the magnetic core middle column 211, and the groove of the magnetic core middle column 211 is consistent with the groove 2132 of the magnetic yoke 213, so that the inside of the magnetic core middle column 211 can be cooled through the groove, thereby further improving the heat dissipation effect.

[0059] In summary, the resonant inductor provided by the embodiment of the present application comprises a magnetic core, a winding and a fixing frame corresponding to the magnetic core. The magnetic core comprises a magnetic core middle column and a plurality of magnetic core side columns. The fixing frame is arranged around the outside of the magnetic core middle column and located in the space between the magnetic core middle column and the magnetic core side column, and the winding is wound on the fixing frame. A plurality of through holes can be provided on the fixing frame. On the basis of the transformer designed based on a small-size magnetic core, the ventilation and heat dissipation of the winding can be enhanced through the plurality of through holes, thereby improving the heat dissipation effect of the resonant inductor.

[0060] Moreover, by controlling the area of the fixing frame where no through hole is provided to cover the area where the heat conduction sheet in the magnetic core middle column is located, the eddy current generated due to the magnetic leakage of the area where the heat conduction sheet is located can be reduced, thereby reducing the influence of the temperature increase of the winding and further reducing the influence of the heating of the winding on the heat dissipation of the resonant inductor.

[0061] In addition, by providing a ventilation groove on the magnetic core side column of the magnetic core, the winding can be further cooled through the ventilation groove on the basis of being cooled through the plurality of through holes of the fixing frame, thereby further improving the heat dissipation effect of the winding.

[0062] Furthermore, by providing at least one heat dissipation groove on each magnetic yoke, a planar ventilation port can be formed, thereby effectively reducing the wind resistance of the resonant inductor and further improving the ventilation effect of the resonant inductor to improve the heat dissipation effect of the resonant inductor.

[0063] Further, the area where the magnetic yoke contacts the magnetic core middle column is provided with a groove, and the magnetic core middle column can also be cooled through the groove, thereby improving the heat dissipation effect of the resonant inductor.

[0064] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0065] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0066] In the embodiments provided in the present application, it should be understood that the disclosed apparatuses / devices and methods can be implemented in other ways. For example, the above-described apparatus / device embodiments are merely illustrative. For example, the division of the modules or units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the display or discussion of the coupling or direct coupling or communication connection between the units can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0067] It should be understood that the term "comprising" as used in the specification and the appended claims indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0068] It should also be understood that the term "and / or" as used in the specification and the appended claims indicates any combination of one or more of the associated listed items and all possible combinations thereof.

[0069] As used in the specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [the described condition or event] is detected" can be interpreted as meaning "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0070] In addition, in the description of the specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0071] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A resonant inductance, characterized by, The resonant inductor comprises a magnetic core, a winding and a fixing frame corresponding to the magnetic core, the magnetic core comprises a magnetic core middle column and a plurality of magnetic core side columns; The fixing frame is arranged around the outside of the magnetic core middle column and in the space between the magnetic core middle column and the magnetic core side columns, and the winding is wound on the fixing frame; The fixing frame is provided with a plurality of through holes.

2. The resonant inductance of claim 1, wherein, Both ends of the magnetic core are provided with a magnetic yoke, and the plane where each magnetic yoke is located is perpendicular to the axis of the magnetic core; Each magnetic yoke is provided with at least one heat dissipation groove located at the edge of the magnetic yoke.

3. The resonant inductance of claim 2, wherein, The area where the magnetic yoke contacts the magnetic core middle column is provided with a groove connected with the edge of the heat dissipation groove.

4. The resonant inductance of claim 1, wherein, The magnetic core middle column comprises a plurality of middle column segments connected by a heat conduction sheet, and the center points of the cross sections of each middle column segment coincide.

5. The resonant inductance of claim 4, wherein, The heat conduction sheet is composed of at least one of ceramic substrate, heat conduction silicon sheet and vacuum cavity all-heating plate.

6. The resonant inductance of claim 4, wherein, The projection of the heat conduction sheet on the fixing frame does not intersect or coincide with the area where the plurality of through holes of the fixing frame are located.

7. The resonant inductance of claim 4, wherein, The size of the air gap formed by the heat conduction sheet in the magnetic core middle column is less than or equal to a pre-set air gap threshold.

8. The resonant inductor of any one of claims 1 to 7, wherein, At least one of the magnetic core side columns is provided with a ventilation groove for heat dissipation of the winding.

9. The resonant inductor of any one of claims 1 to 7, wherein, The projection of the through hole of the fixing frame on the winding is located in the winding.

10. A charging device, characterized by The charging device comprises a charging module, a charging interface and a power distribution unit, the charging module comprises the resonant inductor as claimed in any one of claims 1 to 9; The charging module is used to supply power to the power distribution unit; The power distribution unit is used to adjust the charging power when the charging module supplies power, and supply power to the charging interface according to the adjusted charging power; The charging interface is used to charge the device according to the adjusted charging power.

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