Inductor, power conversion circuit, power supply module and energy storage equipment

Abstract

The utility model provides an inductor which comprises a power inductor, a shielding shell, a first heat-conducting glue layer, a machine shell, a second heat-conducting glue layer and a magnetic ring, the power inductor is contained in the shielding shell, and the space between the shielding shell and the power inductor is filled with the first heat-conducting glue layer; the shell is sleeved outside the shielding shell, and the second heat-conducting glue layer is filled between the shell and the shielding shell; the magnetic ring is arranged outside the casing, and a lead of the power inductor extends out of the shielding casing and the casing and then penetrates through the magnetic ring. The utility model further provides a power conversion circuit, a power module and energy storage equipment adopting the inductor, and electromagnetic interference can be reduced by arranging the inductor.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to an inductor, a power conversion circuit, a power module, and an energy storage device. Background Technology

[0002] Inductors are crucial components in power conversion circuits, often playing active roles such as energy storage and filtering. Due to limitations in raw materials and manufacturing processes, parasitic capacitances inevitably form between the inductor windings. At high frequencies, these parasitic capacitances generate electromagnetic radiation, causing cross-coupling between spatial and loop interference, and potentially even resonance that further amplifies the interference. Therefore, it is necessary to design an inductor that can reduce electromagnetic interference (EMI). Utility Model Content

[0003] In view of this, this application provides an inductor, a power conversion circuit, a power module, and an energy storage device that can improve electromagnetic interference.

[0004] The first aspect of this application provides an inductor, which includes: a power inductor, a shielding shell, a first thermally conductive adhesive layer, a housing, a second thermally conductive adhesive layer, and a magnetic ring. The power inductor is housed within the shielding shell, and the first thermally conductive adhesive layer fills the space between the shielding shell and the power inductor. The housing is fitted over the shielding shell, and the second thermally conductive adhesive layer fills the space between the housing and the shielding shell. The magnetic ring is disposed outside the housing, and the leads of the power inductor extend out of the shielding shell and the housing and pass through the magnetic ring.

[0005] In one embodiment, the shielding shell includes a first shell and a first cover. The first shell has a receiving groove inside, and the power inductor is located in the receiving groove. The first cover is disposed on the first shell and closes the first shell.

[0006] In one embodiment, the housing includes a second housing and a second cover. The second housing has an internal accommodating space, a shielding shell is located in the accommodating space, and the second cover is disposed on the second housing and closes the accommodating space.

[0007] In one embodiment, the second housing includes a main body and an extension extending outward from the outer periphery of the main body, the extension having a relief groove in which at least a portion of the magnetic ring is received.

[0008] In one embodiment, the magnetic ring contacts the groove wall of the relief groove and is supported by the groove wall of the relief groove.

[0009] In one embodiment, the lead wire is wound around the magnetic ring to secure the magnetic ring; or, the magnetic ring is secured to the lead wire by a fastener.

[0010] In one embodiment, the shielding shell is made of metal, and the housing is made of metal or non-metal.

[0011] The second aspect of this application provides a power conversion circuit, which includes a power switch and an inductor as described in the first aspect or any embodiment of the first aspect, wherein the power switch is connected to the inductor.

[0012] In one embodiment, the power conversion circuit is a DC-DC converter circuit or a DC-AC converter circuit.

[0013] A third aspect of this application provides a power module, which includes a power conversion circuit as described in the second aspect or any embodiment of the second aspect.

[0014] In one embodiment, the power supply module is a DC-DC converter module or an inverter module.

[0015] The fourth aspect of this application provides an energy storage device, which includes a battery and a power conversion circuit as described in the second aspect or any embodiment of the second aspect, wherein the battery is connected to the power conversion circuit.

[0016] Compared with the prior art, this application has at least the following advantages:

[0017] The inductor of this application comprises a power inductor, a shielding shell, a first thermally conductive adhesive layer, a housing, a second thermally conductive adhesive layer, and a magnetic ring. The power inductor is housed within the shielding shell, and the housing is fitted over the shielding shell. The shielding shell and the power inductor are filled with the first thermally conductive adhesive layer, and the housing and the shielding shell are filled with the second thermally conductive adhesive layer. This design ensures a stable overall structure and good heat dissipation, contributing to stable inductor operation and suppressing electromagnetic interference. Furthermore, the shielding shell isolates interference coupling paths, and the magnetic ring, located outside the housing and fitted over the leads of the power inductor, further shields against electromagnetic interference. Therefore, the inductor of this embodiment can effectively reduce electromagnetic interference released and coupled through the power inductor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an inductor provided in an embodiment of this application.

[0019] Figure 2 yes Figure 1 The diagram shows a partial exploded view of the inductor when the first and second thermally conductive adhesive layers are not filled.

[0020] Figure 3 yes Figure 1 A cross-sectional view of the inductor shown.

[0021] Figure 4 This is a schematic diagram of a power conversion circuit provided in an embodiment of this application.

[0022] Figure 5 This is a circuit diagram of a power conversion circuit provided in one embodiment of this application.

[0023] Figure 6 This is a circuit diagram of a power conversion circuit provided in another embodiment of this application.

[0024] Figure 7 This is a circuit diagram of a power conversion circuit provided in another embodiment of this application.

[0025] Figure 8 This is a schematic diagram of a power module provided in an embodiment of this application.

[0026] Figure 9 This is a schematic diagram of an energy storage device provided in an embodiment of this application.

[0027] Figure 10 This is a waveform diagram of conducted interference generated on the grid-connected power line when the inverter module uses a conventional inductor.

[0028] Figure 11 This is a waveform diagram of conducted interference generated on the grid-connected power line when the inverter module uses the inductor of the embodiment of this application.

[0029] Figure 12 This is a waveform diagram of near-field radiation generated by an inverter module when using a conventional inductor.

[0030] Figure 13 This is a waveform diagram of near-field radiation generated by the inverter module when using the inductor in the embodiment of this application. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application. Unless otherwise specified, the different embodiments and features described below can be combined with each other.

[0032] Figure 1 A schematic diagram of an inductor 100 provided in an embodiment of this application is shown. Figure 2 A partially exploded view of an inductor 100 provided in an embodiment of this application is shown. For ease of description, Figure 1 and Figure 2The system also defines an XYZ coordinate system, where the Y-axis represents the up-down direction (i.e., the height direction), the X-axis represents the left-right direction, and the Z-axis represents the front-back direction. The plane containing the X-axis and Z-axis is a horizontal plane. Figure 3 A cross-sectional view of an inductor 100 provided in an embodiment of this application is shown.

[0033] Please refer to the following: Figures 1 to 3 The inductor 100 includes: a power inductor 10, a shielding shell 20, a first thermally conductive adhesive layer 30, a housing 40, a second thermally conductive adhesive layer 50, and a magnetic ring 60.

[0034] The power inductor 10 is a component used to convert electrical energy into magnetic energy and store magnetic energy. The power inductor 10 includes a magnetic core 101 and a winding 102 wound on the magnetic core 101. The end of the winding 102 can serve as a lead 103 of the power inductor 10, which can extend outwards to connect to a power circuit. When current flows through the winding 102, the winding 102 can generate an electromagnetic field. When a change in current causes a change in the magnetic field, an induced electromotive force can be generated in the winding 102 of the power inductor 10. The magnetic core 101 enhances the magnetic field, thereby increasing the ability to store magnetic energy (i.e., increasing the inductance).

[0035] The type of power inductor 10 can be selected according to actual needs, and no special limitation is made here. For example, power inductor 10 can be a high-frequency inductor, or a single-phase inductor or a multi-phase inductor, or a ferrite inductor, silicon steel sheet inductor, amorphous or nanocrystalline inductor, or powder ferroin inductor, etc. The number of power inductors 10 can be one or more. For ease of description, this application embodiment uses an inductor 100 containing one power inductor 10 as an example for illustration.

[0036] The power inductor 10 is housed within the shielding housing 20. Specifically, as follows: Figure 2 As shown, the shielding shell 20 includes a first shell 201 and a first cover 202. The first shell 201 has a receiving groove 203 inside, and the power inductor 10 is located in the receiving groove 203. In one embodiment, as... Figure 2 As shown, the internal space of the first housing 201 can be directly used as the receiving slot 203. In another embodiment, the first housing 201 may have a slot seat inside, and the slot seat may further have a receiving slot 203. The first cover 202 can be placed on the first housing 201 to close the first housing 201.

[0037] The first housing 201 and the first cover 202 are made of metal. The shapes of the first housing 201 and the first cover 202 can be set according to actual needs, and are not specifically limited here. The first cover 202 may have through holes to allow the leads 103 of the power inductor 10 to extend out of the shielding housing 20.

[0038] It is understandable that power inductor 10 is a power device. When power inductor 10 is connected to a power circuit, interference noise in the circuit will be amplified by power inductor 10. In addition, since power inductor 10 is a magnetic device, changes in its own electric and magnetic fields during operation will also generate certain electromagnetic interference. Therefore, when power inductor 10 is housed within shielding shell 20, shielding shell 20 can block the propagation of interference, thereby reducing electromagnetic interference.

[0039] like Figure 3 As shown, a first thermally conductive adhesive layer 30 is also filled between the power inductor 10 and the shielding shell 20. In the actual manufacturing process, the power inductor 10 can be placed inside the first shell 201, then the thermally conductive adhesive can be poured into the first shell 201, and then the first cover 202 can be placed on top. After the thermally conductive adhesive cools and solidifies, the first thermally conductive adhesive layer 30 is formed. The type of thermally conductive adhesive can be selected according to the actual situation, such as silicone thermally conductive adhesive, epoxy resin thermally conductive adhesive, or polyurethane thermally conductive adhesive, etc., and no specific limitation is made here.

[0040] It is understandable that the first thermally conductive adhesive layer 30 can fix the power inductor 10 and the shielding shell 20. At the same time, when the power inductor 10 is working, it can quickly conduct the heat generated by the power inductor 10 to the shielding shell 20 to achieve heat dissipation of the power inductor 10.

[0041] A housing 40 is also fitted over the shielding shell 20. Specifically, as... Figure 2 As shown, the housing 40 includes a second housing 401 and a second cover 402. The second housing 401 has an internal receiving space 403, and the shielding shell 20 is located in the receiving space 403. The second cover 402 can cover the second housing 401 to close the receiving space 403.

[0042] Furthermore, in one embodiment, such as Figure 2 As shown, the second housing 401 may include a main body 4011 and an extension 4012. The main body 4011 forms a receiving space 403, and the extension 4012 extends outward from the outer periphery of the main body 4011. The extension direction of the extension 4012 may be horizontal. The main body 4011 and the extension 4012 are integrally formed. Of course, in other embodiments, the extension 4012 and the main body 4011 may also be separately formed. The second cover 402 may be applied to and cover the main body 4011.

[0043] Both the second housing 401 and the second cover 402 can be made of metal or non-metal. The shapes of the second housing 401 and the second cover 402 can be set according to actual needs and are not specifically limited here. The second cover 402 may have through holes to allow the leads 103 of the power inductor 10 to extend out of the housing 40.

[0044] like Figure 3 As shown, a second thermally conductive adhesive layer 50 is also filled between the shielding shell 20 and the housing 40. In the actual manufacturing process, the shielding shell 20 containing the power inductor 10 and the first thermally conductive adhesive layer 30 can be placed inside the second housing 401, and then the thermally conductive adhesive can be poured into the second housing 401. The second cover 402 is then placed on top, and the second thermally conductive adhesive layer 50 is formed after the thermally conductive adhesive cools and solidifies.

[0045] It is understandable that the second thermally conductive adhesive layer 50 can fix the shielding shell 20 and the housing 40. At the same time, it can also quickly conduct the heat of the shielding shell 20 to the housing 40 and dissipate it to the external environment, thereby improving the heat dissipation efficiency of the power inductor 10.

[0046] In the embodiments of this application, such as Figure 1 As shown, a magnetic ring 60 is also provided outside the housing 40. The lead 103 of the power inductor 10 extends through the magnetic ring 60 after passing through the shielding shell 20 and the housing 40. The lead 103 can be wound around the magnetic ring 60 to fix the magnetic ring 60 to the lead 103. Alternatively, the magnetic ring 60 can be fixed to the lead 103 by fasteners (such as cable ties). The magnetic ring 60 can prevent the propagation of interference and filter out high-frequency noise. The specifications of the magnetic ring 60 can be selected according to the magnitude of electromagnetic interference (such as radiated interference), and are not specifically limited here.

[0047] In one embodiment, the extension 4012 of the second housing 401 may be recessed downwards at a position adjacent to the lead 103 to form a relief groove 4013. The relief groove 4013 may, for example, be a downwardly recessed arc shape to fit the shape of the magnetic ring 60. Thus, while the magnetic ring 60 is fixed to the lead 103, at least a portion of the magnetic ring 60 can be accommodated within the relief groove 4013, thereby reducing the overall height of the inductor 100. In practical use, the magnetic ring 60 can also contact and be supported by the groove wall of the relief groove 4013, thereby improving the installation stability of the magnetic ring 60.

[0048] In one embodiment, after the lead 103 of the power inductor 10 passes through the magnetic ring 60, it can be fixedly connected to the circuit board by a connector (such as a screw) and electrically connected to the electronic components in the power circuit on the circuit board.

[0049] For example, when inductor 100 is electrically connected to a power switching transistor, inductor 100 can function as an energy storage or resonant circuit. As another example, when power inductor 10 is electrically connected to a capacitor and / or a resistor, inductor 100 can function as a filter or rectifier.

[0050] In addition, this application also provides a power conversion circuit 1000, which can be applied to energy storage power supplies, server power supplies, vehicle power supplies and other fields.

[0051] like Figure 4 As shown, the power conversion circuit 1000 includes an inductor 100 connected to other electronic components 200. Among them, such as... Figures 5 to 7 As shown, inductor 100 is the inductor 100 described in the foregoing embodiment, and can be represented as L. Inductor 100 is an external inductor. Other electronic devices 200 may include at least one of the following: power switch S, capacitor, resistor, diode D, etc.

[0052] The type and topology of the power conversion circuit 1000 can be designed according to the actual application, and no specific limitations are made here. For example, the power conversion circuit 1000 can be a DC-DC conversion circuit, such as a BUCK circuit (see, for example, [reference needed]). Figure 5 ), BOOST circuit (for example, see Figure 6 ), BUCK-BOOST circuit (for example, see Figure 7 Examples include dual active bridge (DAB) DC-DC converter circuits, LLC resonant converter circuits, etc. As another example, power conversion circuit 1000 can be a DC-AC converter circuit, specifically a dual active bridge DC-AC converter circuit, a three-phase bridge DC-AC converter circuit, etc. As yet another example, power conversion circuit 1000 can also be an AC-AC converter circuit, etc.

[0053] like Figure 8 As shown, this application embodiment also provides a power module 2000. The power module 2000 includes the aforementioned power conversion circuit 1000.

[0054] In one embodiment, the power module 2000 may be a DC-DC converter module, including a DC-DC converter circuit. In another embodiment, the power module 2000 may be an inverter module, including a DC-AC circuit, or including both a DC-AC circuit and a DC-DC circuit. One side of the inverter module may serve as the grid-connected side, which can be used to connect to the power grid via a power line.

[0055] It is understood that the power module 2000 may also include related circuits of the power conversion circuit 1000 (not shown in the figure), such as control circuits, protection circuits, pre-stage circuits or post-stage circuits, etc., which can be determined according to the actual situation and are not specifically limited here.

[0056] like Figure 9 As shown in the illustration, this application also provides an energy storage device 3000. The energy storage device 3000 includes a battery 4000 and the aforementioned power conversion circuit 1000. The battery 4000 can be connected to the power conversion circuit 1000. Therefore, the battery 4000 can serve as a load for the power conversion circuit 1000, storing the energy output by the power conversion circuit 1000. Alternatively, the battery 4000 can also serve as a power source for the power conversion circuit 1000, providing input to the power conversion circuit 1000.

[0057] In addition, to verify the electromagnetic interference suppression effect of the inductor 100 in this application embodiment, a simulation comparison experiment was also conducted in this application embodiment.

[0058] Specifically, Figure 10 The image shows a waveform diagram of conducted interference generated on the grid-connected power line when an inverter module uses a conventional inductor. Figure 11 A waveform diagram is shown showing the conducted interference generated on the grid-connected power line when the inverter module uses the inductor 100 of the embodiment of this application. Figure 12 This diagram shows a waveform of near-field radiation generated by an inverter module using a conventional inductor. Figure 13 A waveform diagram of near-field radiation generated by the inverter module when using the inductor 100 according to an embodiment of this application is shown. It should be understood that in the comparative experiment, apart from the inductor used in the inverter module, all other experimental conditions were kept consistent.

[0059] Combination Figure 10 and Figure 11 It can be seen that when the inverter module uses the inductor 100 of the embodiment of this application, the extreme values ​​of QPK (quasi-peak), AVG (average), PK+ (peak), and AVG (average) generated by the power line on the grid-connected side are all smaller, indicating that the intensity of conducted interference is smaller. Figure 12 and Figure 13 This is a graph generated by RIGOL software, with the vertical axis representing dBm values, combined with... Figure 12 and Figure 13 It can be seen that when the inverter module uses the inductor 100 of this embodiment, the dBm value of the generated near-field radiation is lower, indicating that the signal strength of the generated near-field radiation is smaller. Therefore, the inductor 100 of this embodiment can suppress both conducted interference and radiated interference, effectively reducing electromagnetic interference.

[0060] In general, power conversion circuits generate electromagnetic interference (EMI) during operation, which can interfere with surrounding electronic equipment. Because high-frequency power switches are commonly used in power conversion circuits, they produce significant high-frequency noise during operation. To reduce EMI, most current solutions focus on studying the device parameters and control methods of the power switches, establishing common-mode and differential-mode circuit models for analysis and solution, and then reducing EMI by changing control methods, optimizing switching time, and adding frequency dithering techniques. However, they do not consider that inductance is also a contributing factor to EMI.

[0061] Based on this, the present application proposes the aforementioned inductor. By comprising a power inductor, a shielding shell, a first thermally conductive adhesive layer, a housing, a second thermally conductive adhesive layer, and a magnetic ring, wherein the power inductor is housed within the shielding shell, the housing is fitted over the shielding shell, the shielding shell and the power inductor are filled by the first thermally conductive adhesive layer, and the housing and the shielding shell are filled by the second thermally conductive adhesive layer, the overall structure of the inductor is stable and the heat dissipation performance is good. This helps the inductor to operate stably and suppresses the generation of electromagnetic interference. Moreover, the shielding shell can block the coupling path of electromagnetic interference, and the magnetic ring fitted over the leads of the power inductor can further reduce the electromagnetic interference released and coupled out through the power inductor.

[0062] Therefore, the inductor in this application embodiment can effectively reduce electromagnetic interference and improve electromagnetic compatibility (EMC).

[0063] When the inductors of this application are applied to power conversion circuits, power modules, or energy storage devices, they can improve the electromagnetic compatibility of the circuits, modules, or devices, ensuring their stable operation. Furthermore, by improving electromagnetic interference in the early stages of circuit, module, or device design, this approach also reduces the difficulty of modifying the EMC performance of the circuits, modules, or devices in the later stages of design.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An inductor characterized by, The inductor comprises a power inductor, a shielding shell, a first heat-conductive adhesive layer, a casing, a second heat-conductive adhesive layer and a magnetic ring, wherein The power inductor is accommodated in the shielding shell, and the first heat-conductive adhesive layer is filled between the shielding shell and the power inductor; The casing is sleeved outside the shielding shell, and the second heat-conductive adhesive layer is filled between the casing and the shielding shell; The magnetic ring is arranged outside the casing, and the lead of the power inductor extends out of the shielding shell and the casing and then passes through the magnetic ring.

2. The inductor of claim 1, wherein, The shielding shell comprises a first shell and a first cover, the first shell is internally provided with an accommodation groove, the power inductor is located in the accommodation groove, and the first cover is arranged on the first shell and seals the first shell.

3. The inductor of claim 1, wherein, The casing comprises a second shell and a second cover, the second shell is internally provided with an accommodation space, the shielding shell is located in the accommodation space, and the second cover is arranged on the second shell and seals the accommodation space.

4. The inductor of claim 3, wherein, The second shell comprises a main body and an extension part extending outward from the outer periphery of the main body, the extension part is formed with a clearance groove, and at least part of the magnetic ring is accommodated in the clearance groove.

5. The inductor of claim 4, wherein, The magnetic ring is in contact with the groove wall of the clearance groove and is supported by the groove wall of the clearance groove.

6. The inductor of claim 1, wherein The lead is wound around the magnetic ring to fix the magnetic ring, or the magnetic ring is fixed to the lead by a fixing member.

7. A power conversion circuit, characterized by, The power conversion circuit comprises a power switch tube and the inductor as claimed in any one of claims 1 to 6, and the power switch tube is connected with the inductor.

8. The power conversion circuit of claim 7, wherein, The power conversion circuit is a DC-DC conversion circuit or a DC-AC conversion circuit.

9. A power module, characterized by The power supply module comprises the power conversion circuit as claimed in claim 7.

10. An energy storage device, characterized by, The energy storage device comprises a battery and the power conversion circuit as claimed in claim 7, and the battery is connected with the power conversion circuit. The energy storage device comprises a battery and the power conversion circuit as claimed in claim 7, and the battery is connected with the power conversion circuit.

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