Power converter

Abstract

A power converter. The magnetic core and the coil of the inductor are arranged in the protective shell in an exposed mode and directly arranged in the space defined by the protective shell, and direct ventilation and heat dissipation of the inductor are achieved. The sealing ring surrounds the periphery of the hollowed-out area and the periphery of the fastener, the position, where the fastener penetrates, of the shell and the position, where the second section penetrates, of the shell are sealed at the same time, impurities are prevented from entering the shell from the hollowed-out area and the position, where the fastener penetrates, of the shell, the sealing performance between the inductor and the shell is improved, and the service life of the inductor is prolonged. And a high protection level in the shell is realized. The first section and the second section are arranged in a bent manner, so that a straight-through path is prevented from being formed between the wire outlet end and the shell, and the leakage resistance is greatly increased. The hollowed-out area only needs to allow the second section to extend into the shell, the size of the hollowed-out area can be designed according to the size of the second section, the opening area of the hollowed-out area on the shell can be reduced, and the difficulty that impurities enter the shell through the hollowed-out area is increased.

Description

Technical Field

[0001] This application relates to the field of photovoltaic power generation technology, and in particular to a power converter. Background Technology

[0002] Inductors are commonly used filtering and energy storage devices in power converters (such as photovoltaic inverters). They typically consist of a magnetic core and coils. During operation, inductors generate a significant amount of heat due to the inherent properties of their materials, becoming a bottleneck for power converter power output. To quickly cool the inductor's heat, inductors are usually placed separately from critical power converter components. The inductor is exposed to the external environment for direct ventilation cooling, while critical power converter components, such as power semiconductors, capacitors, and circuit boards, need to be housed in a highly protected power cavity. However, direct ventilation cooling offers poor protection, allowing external impurities to easily enter the casing through the connection between the inductor and the power converter's housing and contaminate internal components. Therefore, improving the heat dissipation performance of the inductor while simultaneously enhancing the seal between the inductor and the casing is a crucial problem that needs to be solved. Summary of the Invention

[0003] This application provides a power converter.

[0004] This application provides a power converter, which includes a housing, a circuit board, an inductor, a sealing ring, and a protective shell. The housing is connected to the protective shell and houses the circuit board. The circuit board is provided with a power conversion circuit for converting direct current (DC) from a photovoltaic module or an energy storage battery into alternating current (AC). The inductor is housed within the protective shell and includes a first fixing plate, a magnetic core, and a coil. The first fixing plate is connected to the housing via fasteners. The magnetic core and coil are exposed within the protective shell, and the magnetic core is connected to the first fixing plate. The coil is wound around the magnetic core, and the coil's output end includes a first segment and a second segment connected together. The first segment is located on the side of the first fixing plate facing the magnetic core, or on the side of the first fixing plate away from the magnetic core. The second segment is bent relative to the first segment and passes through a cutout area of ​​the housing, and the second segment is connected to the circuit board. The sealing ring is located between the first fixing plate and the housing, and surrounds the fasteners and the outer periphery of the cutout area of ​​the second segment.

[0005] In this application, the magnetic core and coil of the inductor are exposed inside the protective shell. That is, the inductor does not need to be equipped with an inductor metal shell and potting compound. The magnetic core and coil are directly placed in the space enclosed by the protective shell, which realizes direct ventilation and heat dissipation of the inductor and greatly improves the heat exchange efficiency of the inductor.

[0006] Since both the second segment and the fastener penetrate the outer shell, the sealing ring is positioned on the outer periphery of the perforated areas of the fastener and the second segment. During the process of tightening the fastener between the first fixing plate and the outer shell, the sealing ring between the first fixing plate and the outer shell is compressed, allowing it to fit tightly against them. The sealing ring surrounds the outer periphery of the perforated area and the fastener, simultaneously sealing the locations where the fastener and the second segment penetrate the outer shell. This prevents external moisture, dust, exhaust gases, and other impurities from entering the outer shell through the perforated areas and the fastener's penetration points, improving the seal between the inductor and the outer shell and achieving a high level of protection for the inner shell.

[0007] The bent design of the first and second sections avoids a straight path between the cable outlet and the outer casing, making the leakage path at the joint between the first and second sections more tortuous and winding. This significantly increases leakage resistance and improves the sealing protection of the inner casing. Furthermore, the perforated area only requires the second section to extend into the casing, and the size of the perforated area can be designed according to the dimensions of the second section. This eliminates the need for the first fixing plate to extend into the casing, reducing the area of ​​the perforated area on the casing. This increases the difficulty for external moisture, dust, exhaust gases, and other impurities to enter the casing through the perforated area, and effectively shortens the circumference of the sealing ring for sealing this perforated area, reducing the sealing difficulty.

[0008] In one possible implementation, when the first segment is located on the side of the first fixed plate away from the magnetic core, the side of the first segment away from the magnetic core contacts the sealing ring.

[0009] In this way, the sealing ring can seal the mating surface between the first fixing plate and the outer shell, and also seal the mating surface between the first segment and the outer shell.

[0010] In one possible implementation, the power converter further includes a first seal, at least a portion of which is disposed between the first segment and the first fixing plate. The side of the first fixing plate facing away from the magnetic core has a first groove that accommodates the first segment and the compressed first seal. The side of the first fixing plate with the first groove is flush with the side of the first segment facing away from the magnetic core.

[0011] When the first fixing plate and the outer shell are connected and fixed, the first sealing element housed in the first groove is squeezed, thus being in a compressed state. This creates continuous contact pressure between the first sealing element and the bottom and sides of the first groove, ensuring it is firmly pressed into the groove and is not easily twisted or displaced due to vibration, thus guaranteeing the reliability and durability of the first sealing element's seal. Simultaneously, the first segment housed in the first groove is flush with the side of the first fixing plate with the first groove. There is no step between the side of the first segment facing away from the magnetic core and the surface of the first fixing plate with the first groove, allowing the sealing ring to fit smoothly against both the surface of the first fixing plate with the first groove and the side of the first segment facing away from the magnetic core. By sealing the two opposing sides of the first segment with the first sealing element and the sealing ring, the sealing protection inside the outer shell is strengthened. The combined sealing method of the first sealing element and the sealing ring facilitates quick replacement of the sealing ring and the first sealing element later, resulting in high maintainability.

[0012] In one possible implementation, the first seal has a receiving groove on the side facing the first segment, the receiving groove is adapted to and accommodates the first segment, and the sidewall of the receiving groove is in a compressed state and in contact with the sealing ring.

[0013] The design of the receiving groove allows its bottom wall (actually part of the first seal) to seal the gap between the side of the first segment facing the magnetic core and the first fixing plate. The side wall of the receiving groove is in a compressed state. In fact, before assembly, the thickness of the side wall of the receiving groove is greater than the depth of the first groove. When the first fixing plate and the outer shell are locked, the sealing ring and the first seal located between the first fixing plate and the outer shell are squeezed, so that the side wall of the receiving groove can fill the gap between the side of the first segment and the side wall of the first groove as much as possible. This allows the side wall of the receiving groove (actually part of the first seal) to be in close contact with the sealing ring, achieving a seal between the side of the first segment and the side wall of the first groove. The contact between the side wall of the receiving groove and the first segment also increases the leakage path and makes it more difficult for impurities to enter the interior of the outer shell, thereby strengthening the sealing protection inside the outer shell.

[0014] In one possible implementation, the inductor further includes a second fixing plate disposed between the first fixing plate and the magnetic core, the second fixing plate being connected to the first fixing plate, and the side of the second fixing plate facing away from the first fixing plate being connected to the magnetic core. The power converter also includes a second seal disposed between the second fixing plate and the first fixing plate. Specifically, a first segment is disposed between the second fixing plate and the first fixing plate, and at least a portion of the second seal is located between the first segment and the first fixing plate.

[0015] The second fixing plate separates the first segment, which is located on the side of the first fixing plate facing the magnetic core, from the magnetic core. This prevents the first segment from directly contacting the magnetic core, reducing the possibility of wear on the insulating layer of the first segment's surface due to vibration and friction, and thus improving the reliability of both the first segment and the magnetic core. Since the joint between the first segment and the first fixing plate connects to the hollow area through the joint between the second segment and the first fixing plate, the second sealing element effectively seals the joint between the first segment and the first fixing plate. This strengthens the sealing protection of the hollow area and reduces wear on the first segment from the first fixing plate, ensuring the reliability of the first segment.

[0016] In one possible implementation, the second seal is a ring-shaped structure, with a portion of the second seal abutting between the first and second fixing plates. The first fixing plate has a second groove that adapts to and accommodates the second seal in a compressed state. One of the first and second fixing plates has a third groove that adapts to and accommodates the first segment, with the depth of the third groove equal to the thickness of the first segment.

[0017] The second seal not only seals the joint between the first segment and the first fixed plate, but also seals the joint between the first and second fixed plates, thus providing a sealed protection around the perforation of the second segment through the first fixed plate. The second and third grooves allow the second seal, located between the first and second fixed plates, to be embedded within the first fixed plate, and the first segment, located between the first and second fixed plates, to also be embedded within either plate. This effectively positions the second seal and the first segment, preventing misalignment or detachment between the plates. Furthermore, the second and third grooves increase the leakage path and the difficulty for impurities to enter the housing, thereby improving the sealing protection level inside the housing.

[0018] By controlling the depth of the third groove, the surface of the third groove can be flush with the first segment housed in the third groove. In this way, the second fixing plate can be installed and fixed against the side of the first fixing plate facing the magnetic core, reducing the gap between the first fixing plate and the second fixing plate. At the same time, pressure is applied to the second seal housed in the second groove, so that the second seal housed in the second groove is in a compressed state, and the first segment housed in the third groove is limited and fixed.

[0019] In one possible implementation, when both the second and third grooves are located on the first fixing plate, a portion of the second groove is located at the bottom of the third groove.

[0020] By opening a second groove at the bottom of the third groove, the second seal can be accommodated in the second groove, and the first segment can also be accommodated in the third groove. The thickness of the first segment is equal to the depth of the third groove. The side of the first segment facing the magnetic core is flush with the side of the first fixing plate facing the magnetic core. Thus, the side of the first segment facing the magnetic core and the side of the first fixing plate facing the magnetic core can be installed close to the second fixing plate.

[0021] In one possible implementation, the second seal has a notch that receives a portion of the first segment, and the two opposite walls of the notch contact the two opposite sides of the first segment, respectively.

[0022] The notch design allows the second seal to seal not only the joint between the side of the first section facing away from the magnetic core and the first fixing plate, but also the joints between the two opposite sides of the first section and the first fixing plate, preventing impurities from entering the hollow area through these joints and improving the protection level inside the shell.

[0023] In one possible implementation, the second seal is a ring-shaped structure, with a portion of the second seal abutting between the first and second fixing plates. The first fixing plate has a second groove on its side facing the magnetic core, which fits and accommodates the second seal in a compressed state. The power converter also includes a third seal, at least a portion of which is located between the first segment and the second fixing plate. The second fixing plate has a third groove that accommodates the first segment and the compressed third seal. The side of the second fixing plate with the third groove is flush with the side of the first segment facing away from the magnetic core.

[0024] The second seal not only seals the joint between the first segment and the first fixed plate, but also seals the joint between the first and second fixed plates, providing a sealed protection around the perforation of the second segment through the first fixed plate. The second and third grooves allow the second seal, located between the first and second fixed plates, to be embedded within the first fixed plate. This also allows the first segment and third seal, located between the first and second fixed plates, to be embedded within the second fixed plate. On one hand, this effectively positions the second, first, and third seals, preventing misalignment or detachment between the first and second fixed plates. On the other hand, external impurities can seep into the hollowed-out area through the gap between the first and second fixed plates. The second and third grooves ensure the second fixed plate is tightly fitted to the first fixed plate and also increase the leakage path, making it more difficult for impurities to enter the casing, thereby improving the sealing and protection level of the casing.

[0025] In one possible implementation, the third seal has a receiving groove on the side facing the second seal. The receiving groove is adapted to and accommodates the first segment, and the sidewall of the receiving groove is in a compressed state and in contact with the second seal.

[0026] The design of the receiving groove allows its bottom wall (actually part of the third seal) to seal the gap between the lower surface of the first section and the second fixing plate. Meanwhile, the sidewalls of the receiving groove are compressed. In fact, before assembly, the thickness of the sidewalls of the receiving groove is greater than the depth of the third groove. When the second and first fixing plates are locked, the second and third seals located between them are compressed, allowing the sidewalls of the receiving groove to fill the gap between the side of the first section and the sidewall of the third groove as much as possible. This ensures that the sidewalls of the receiving groove (actually part of the third seal) are in close contact with the second seal, achieving a seal between the side of the first section and the sidewall of the third groove. The contact between the sidewalls of the receiving groove and the first section also increases the leakage path, making it more difficult for impurities to enter the housing, thereby strengthening the internal sealing protection of the housing.

[0027] In one possible implementation, the second seal is positioned opposite the first segment. The first fixing plate has a second groove that accommodates the second seal in a compressed state. The power converter also includes a third seal positioned between the first segment and the second fixing plate, facing the first segment; the second fixing plate has a third groove that accommodates the first segment and the compressed third seal, with the side of the second fixing plate having the third groove flush with the side of the first segment facing away from the magnetic core.

[0028] Both the second and third seals are sealing gaskets. The second seal is positioned opposite the side of the first section away from the magnetic core, and the third seal is positioned opposite the side of the first section facing the magnetic core. In this way, when the second and first fixing plates are locked, the second and third seals can be evenly stressed, avoiding excessive local stress and helping to extend the service life of the second and third seals. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0030] Figure 1 This is a schematic diagram of the architecture of an optical energy storage system provided in one embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the structure of a power converter provided in one embodiment of this application;

[0032] Figure 3This is an exploded view of a power converter according to an embodiment of this application;

[0033] Figure 4 A top view of an inductor provided in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of an inductor provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure of another inductor provided in an embodiment of this application;

[0036] Figure 7 for Figure 6 The diagram shown is an exploded view of the inductor.

[0037] Figure 8 for Figure 6 The diagram shows an exploded view of the inductor from another perspective;

[0038] Figure 9 This is a schematic diagram of the structure of another inductor provided in an embodiment of this application;

[0039] Figure 10 for Figure 9 The diagram shows the exploded structure of the inductor.

[0040] Figure 11 This is a partial structural schematic diagram of another inductor provided in an embodiment of this application;

[0041] Figure 12 This is a schematic diagram of the structure of another inductor provided in an embodiment of this application;

[0042] Figure 13 for Figure 12 The diagram shows the structure of the inductor from another perspective.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10-Outer casing; 11-Second mounting hole; 12-Clearing area; 20-Circuit board; 30-Inductor; 31-First fixing plate; 311-First mounting hole; 312-First groove; 313-Second groove; 3131-First sub-slot; 3132-Second sub-slot; 314-Mounting slot; 32-Magnetic core; 33-Coil; 331-First segment; 332-Second segment; 34-Fastener; 35-Second fixing plate; 351-Third groove; 36-Adapter; 37-Third fixing plate; 38-Locking element; 40-Protective shell; 41-Ventilation hole; 50-Sealing ring; 60-First seal; 61-Receiving groove; 70-Second seal; 71-First part; 72-Second part; 721-Raised strip; 73-Notch; 80-Third seal; 81-Receiving groove; 100-Power converter; 101-Photovoltaic inverter; 102-Energy storage converter; 200-Photovoltaic module; 300-Box substation; 400-Step-up substation; 500-Grid; 600-Energy storage battery. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0046] Please see Figure 1 , Figure 1 This is a schematic diagram of the architecture of a photovoltaic energy storage system provided in one embodiment of this application. Figure 1 As shown, the photovoltaic-storage system includes a photovoltaic system and an energy storage system. In the photovoltaic system, photovoltaic modules 200 convert solar energy into direct current (DC) through the photovoltaic effect. Each photovoltaic module 200 includes multiple cells connected in series or parallel to achieve a certain output power. A photovoltaic inverter 101 converts the DC power from the photovoltaic modules 200 into alternating current (AC), and then transmits the AC power to a corresponding prefabricated substation 300 for voltage transformation. The prefabricated substation 300 can convert the low-voltage AC power output from the photovoltaic inverter 101 into medium-voltage AC power, and then further transmit the AC power to a step-up substation 400 and then to the power grid 500 or other loads. Alternatively, it can further transmit the AC power to a prefabricated substation 300 corresponding to the energy storage converter 102.

[0047] In the energy storage system, the energy storage battery 600 is used to store the unstable electrical energy from the photovoltaic module 200, and provides stable electrical energy to the grid 500 or other loads through the energy storage converter 102 and the corresponding box-type substation 300. In addition, the energy storage converter 102 can also convert the AC power from the grid 500 into DC power to charge the energy storage battery 600 and store the electrical energy in the energy storage battery 600.

[0048] Figure 1In the photovoltaic-storage system shown, the photovoltaic inverter 101 and the energy storage converter 102 are the core devices for power conversion, and they are collectively referred to as the power converter 100. The structure of the power converter 100 provided in this application will be described in detail below with reference to the accompanying drawings. It is worth mentioning that the power converter 100 provided in this application can be applied to residential photovoltaic systems, as well as to photovoltaic-storage systems in large-scale ground-mounted power plants or industrial and commercial applications.

[0049] This application provides a power converter 100 for converting alternating current (AC) and direct current (DC) to the other. In one embodiment, the power converter 100 may be a photovoltaic inverter 101. In this embodiment, the power converter 100 is applied in a photovoltaic system and is used to convert DC power from a photovoltaic module 200 into AC power and transmit the AC power to the power grid 500 or other loads.

[0050] In another embodiment, the power converter 100 may be an energy storage converter 102. In this embodiment, the power converter 100 is applied to an energy storage system. The power converter 100 is used to convert DC power from the energy storage battery 600 into AC power and deliver the AC power to the power grid 500 or other loads. In addition, the power converter 100 can also convert AC power from the power grid 500 into DC power to charge the energy storage battery 600.

[0051] Please see Figure 2 , Figure 2This is a schematic diagram of a power converter 100 according to an embodiment of this application. The power converter 100 includes a housing 10, a circuit board 20, an inductor 30, and a protective shell 40. The housing 10 is connected to the protective shell 40, and the housing 10 encloses a space for housing the circuit board 20. A power conversion circuit is disposed on the circuit board 20, which is used to convert direct current (DC) from photovoltaic modules or energy storage batteries into alternating current (AC). The circuit board 20 can be a printed circuit board (PCB), on which devices such as power modules, DC switches, capacitors, and relays are disposed. In one embodiment, the capacitor, DC switch, relay, and power module can be disposed on the same surface of the circuit board 20. In another embodiment, at least one of the capacitor, DC switch, and relay can be disposed on two opposite surfaces of the circuit board 20. No specific limitation is made. The power module is an execution unit for realizing energy conversion, and it includes a power semiconductor chip, a drive circuit, and a heat dissipation structure. Among them, power semiconductor chips can be devices such as insulated gate bipolar transistors (IGBTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), and diodes.

[0052] Please combine Figure 3 , Figure 3 This is an exploded structural diagram of a power converter 100 according to an embodiment of this application. A protective shell 40 is disposed outside the outer shell 10. The space enclosed by the protective shell 40 is used to house the inductor 30. The protective shell 40 may have multiple ventilation holes, which connect the interior of the protective shell 40 to the external environment. For example, multiple ventilation holes 41 are provided on opposite side walls of the protective shell 40, allowing convective airflow to form inside the protective shell 40, which is beneficial for heat dissipation of the inductor 30. Alternatively, multiple ventilation holes 41 may be provided on multiple side walls of the protective shell 40 to achieve multi-directional ventilation. The protective shell 40, disposed outside the outer shell 10, protects the inductor 30 disposed outside the outer shell 10, achieving impact protection for the inductor 30.

[0053] In one embodiment, the power converter 100 further includes a fan disposed inside the protective housing 40, with the fan blowing air directly onto the inductor 30, so that the heat of the inductor 30 can be directly carried away by the air, thereby improving the heat exchange efficiency.

[0054] Please combine Figure 3 and Figure 4 , Figure 4This is a top view of an inductor 30 according to an embodiment of this application. The inductor 30 includes a first fixing plate 31, a magnetic core 32, and a coil 33. The first fixing plate 31 is connected to the housing 10 by a fastener 34. For example, the first fixing plate 31 is provided with a first mounting hole 311, the housing 10 is provided with a second mounting hole 11, and the fastener 34 (such as a bolt) passes through the second mounting hole 11 and the first mounting hole 311 to fix the first fixing plate 31 to the housing 10.

[0055] The magnetic core 32 and coil 33 are exposed within the protective housing 40. This means the inductor 30 does not require a metal casing or potting compound; the core 32 and coil 33 are directly placed within the space enclosed by the housing 40, enabling direct ventilation and heat dissipation for the inductor 30, significantly improving its heat exchange efficiency. The magnetic core 32 is coated with red paint for corrosion and rust prevention, while the coil 33 is encased in polyetheretherketone (PEEK) plastic to ensure its corrosion resistance and pressure resistance within the housing 40.

[0056] The coil 33 is wound on the magnetic core 32. The lead-out end of the coil 33 includes a first segment 331 and a second segment 332. The first segment 331 is located on the side of the first fixing plate 31 facing the magnetic core 32, or on the side of the first fixing plate 31 away from the magnetic core 32. It can be understood that the first segment 331 is connected to the coil 33 wound on the magnetic core 32. The second segment 332 is bent relative to the first segment 331 and passes through the hollow area 12 of the outer casing 10 to connect with the circuit board 20 inside the outer casing 10. The bent first segment 331 and the second segment 332 avoid forming a straight path between the lead-out end and the outer casing 10, making the leakage path formed at the joint between the first segment 331 and the second segment 332 tortuous and meandering, greatly increasing the leakage resistance and improving the sealing protection of the inside of the outer casing 10.

[0057] Inductor 30 can be a boost inductor, connected to the DC input side of power converter 100, to boost the low-voltage DC power from photovoltaic modules or energy storage batteries, and then supply the boosted DC power to the power conversion circuit within power converter 100. Alternatively, inductor 30 can be a filter inductor, connected to the AC output side of power converter 100, to filter the AC power output from the power conversion circuit, thereby supplying the filtered AC power to the power grid or load.

[0058] The power converter 100 also includes a sealing ring 50, which is disposed between the first fixing plate 31 and the outer shell 10 to seal the gap between the first fixing plate 31 and the outer shell 10. Since the second section 332 and the fastener 34 both pass through the outer shell 10, the sealing ring 50 is disposed around the outer periphery of the perforated area 12 of the fastener 34 and the second section 332. During the process of the fastener 34 locking the first fixing plate 31 and the outer shell 10, the sealing ring 50 disposed between the first fixing plate 31 and the outer shell 10 is compressed, so that the sealing ring 50 can fit tightly between the first fixing plate 31 and the outer shell 10. The sealing ring 50 surrounds the outer periphery of the hollow area 12 and the outer periphery of the fastener 34, and simultaneously seals the position where the fastener 34 passes through the outer shell 10 and the position where the second section 332 passes through, preventing external moisture, dust, exhaust gas and other impurities from entering the interior of the outer shell 10 from the hollow area 12 and the position where the fastener 34 passes through the outer shell 10, thereby improving the sealing performance between the inductor 30 and the outer shell 10 and achieving a high level of protection inside the outer shell 10.

[0059] Furthermore, the hollow area 12 only needs to allow the second section 332 to extend into the interior of the outer shell 10. The size of the hollow area 12 can be designed according to the size of the second section 332. There is no need to extend the first fixing plate 31 into the interior of the outer shell 10, thereby reducing the opening area of ​​the hollow area 12 on the outer shell 10. This increases the difficulty for external moisture, dust, exhaust gas and other impurities to enter the interior of the outer shell 10 through the hollow area 12. In addition, it can also effectively shorten the circumference of the sealing ring 50 for sealing the hollow area 12, reducing the sealing difficulty.

[0060] The coil 33 has a flat structure; for example, it can be a flat copper wire. The first segment 331 has a rectangular shape when projected onto the first fixing plate 31. When the first segment 331 is located on the side of the first fixing plate 31 facing away from the magnetic core 32, it can fit tightly against that side. When the first segment 331 is located on the side of the first fixing plate 31 facing away from the magnetic core 32, that side contacts the sealing ring 50. That is, a portion of the sealing ring 50 is located between the first fixing plate 31 and the outer shell 10, and another portion is located between the first segment 331 and the outer shell 10. Thus, the sealing ring 50 can seal both the contact surface between the first fixing plate 31 and the outer shell 10, and also the contact surface between the first segment 331 and the outer shell 10.

[0061] Please see Figure 3 and Figure 5 , Figure 5This is a schematic diagram of the structure of an inductor 30 provided in an embodiment of this application. In one embodiment, when the first segment 331 is disposed on the side of the first fixing plate 31 facing away from the magnetic core 32, the first segment 331 has a certain thickness. In order for the first fixing plate 31 to better fit on the outer shell 10, the side of the first fixing plate 31 facing away from the magnetic core 32 is provided with a first groove 312. The first groove 312 accommodates the first segment 331. The side of the first fixing plate 31 with the first groove 312 is flush with the side of the first segment 331 facing away from the magnetic core 32. For ease of description, in the arrangement direction of the first fixing plate 31 and the magnetic core 32, the side of the first fixing plate 31 facing the magnetic core 32 is referred to as the lower surface of the first fixing plate 31, the side of the first fixing plate 31 facing away from the magnetic core 32 is referred to as the upper surface of the first fixing plate 31, the side of the magnetic core 32 facing the magnetic core 32 is referred to as the lower surface of the first segment 331, and the side of the first segment 331 facing away from the magnetic core 32 is referred to as the upper surface of the first segment 331. That is, the upper surface of the first fixing plate 31 is flush with the upper surface of the first segment 331. In this way, the sealing ring 50 located between the first segment 331 and the outer shell 10 can fit with the upper surface of the first fixing plate 31 and the upper surface of the first segment 331. This avoids reducing the service life due to excessive twisting of the sealing ring 50, thereby ensuring the sealing between the first segment 331 and the outer shell 10, as well as between the first fixing plate 31 and the outer shell 10.

[0062] Furthermore, the power converter 100 also includes a first seal 60, at least a portion of which is disposed between the first segment 331 and the first fixing plate 31. Specifically, the first seal 60 is disposed on the lower surface of the first segment 331, and since the first segment 331 is housed within the first groove 312, the first seal 60 is also housed within the first groove 312. The first seal 60 can be a rubber gasket, and both the orthographic projection shape of the first seal 60 on the first fixing plate 31 and the orthographic projection shape of the first segment 331 on the first fixing plate 31 can be rectangular. The first groove 312 houses the first seal 60 in a compressed state. That is, when the first fixing plate 31 and the outer casing 10 are connected and fixed, the first seal 60 housed within the first groove 312 is compressed, resulting in continuous contact pressure between the first seal 60 and the sidewalls forming the first groove 312. This ensures that the first seal 60 is firmly pressed within the first groove 312, preventing twisting or displacement due to vibration, thus guaranteeing the reliability and durability of the seal. Meanwhile, the upper surface of the first fixing plate 31 is flush with the upper surface of the first segment 331, so there is no step surface between the upper surface of the first segment 331 and the upper surface of the first fixing plate 31, allowing the sealing ring 50 to fit smoothly against the upper surface of the first fixing plate 31 and the upper surface of the first segment 331.

[0063] In this embodiment, the upper and lower surfaces of the first segment 331 are sealed by the first sealing element 60 and the sealing ring 50, thereby strengthening the sealing protection of the inside of the outer shell 10. The combined sealing method of the first sealing element 60 and the sealing ring 50 facilitates the quick replacement of the sealing ring 50 and the first sealing element 60 in the future, and has high maintainability.

[0064] For example, the first seal 60 has a receiving groove 61 on the side facing the first segment 331. The receiving groove 61 is adapted to and accommodates the first segment 331. The receiving groove 61 is provided so that the bottom wall of the receiving groove 61 (actually a part of the first seal 60) can seal the gap between the lower surface of the first segment 331 and the first fixing plate 31. At the same time, the side wall of the receiving groove 61 (actually a part of the first seal 60) can seal the gap between the side of the first segment 331 and the side wall of the first groove 312. The side of the first segment 331 is connected between the upper surface and the lower surface of the first segment 331. In addition, the sealing ring 50 can seal the gap between the first section 331 and the first fixing plate 31. The gap around the first section 331 can be completely covered by the first sealing element 60 and the sealing ring 50. In this way, impurities are not easy to enter the interior of the outer shell 10 through the hollow area 12 through the gap between the first section 331 and the first fixing plate 31 and the gap between the first section 331 and the outer shell 10, thus achieving a high level of protection inside the outer shell 10.

[0065] The sidewall of the receiving groove 61 is compressed and in contact with the sealing ring 50. In fact, before assembly, the thickness of the sidewall of the receiving groove 61 is greater than the depth of the first groove 312. Thus, when the first fixing plate 31 and the outer shell 10 are locked, the sealing ring 50 and the first sealing element 60 located between the first fixing plate 31 and the outer shell 10 are compressed, allowing the sidewall of the receiving groove 61 to fill the gap between the side of the first section 331 and the sidewall of the first groove 312 as much as possible, so that the sidewall of the receiving groove 61 (actually the first sealing element 60) is in close contact with the sealing ring 50. Through the contact between the first groove 312 and the first sealing element 60, and the contact between the receiving groove 61 and the first section 331, the leakage path is greatly increased, making it more difficult for impurities to enter the interior of the outer shell 10, thereby improving the sealing protection level of the interior of the outer shell 10.

[0066] Please see Figure 6 , Figure 6This is a schematic diagram of another inductor 30 provided in one embodiment of this application. In one embodiment, the inductor 30 further includes a second fixing plate 35, which is disposed between the first fixing plate 31 and the magnetic core 32. The second fixing plate 35 is connected to the first fixing plate 31, and the two fixing plates can be connected and fixed by means of snap-fit ​​or screw connection. For example, the second fixing plate 35 and the first fixing plate 31 are connected by screws. When the screw passes through the second fixing plate 35 and the first fixing plate 31, the sealing ring 50 located between the first fixing plate 31 and the outer shell 10 can be disposed around the outer periphery of the screw. The side of the second fixing plate 35 facing away from the first fixing plate 31 is connected to the magnetic core 32. For example, the side of the second fixing plate 35 facing away from the magnetic core 32 is provided with a slot, which partially engages with the magnetic core 32 to limit the magnetic core 32.

[0067] The second fixing plate 35 separates the first segment 331, which is located on the side of the first fixing plate 31 facing the magnetic core 32, from the magnetic core 32, thus preventing the first segment 331 from directly contacting the magnetic core 32. This reduces the possibility of the insulating layer on the surface of the first segment 331 being worn due to vibration and friction, and helps to improve the reliability of the first segment 331 and the magnetic core 32.

[0068] Please see Figure 3 and Figure 7 , Figure 7 for Figure 6 The diagram shows an exploded view of the inductor 30. The power converter 100 also includes a second seal 70, which is disposed between the second fixing plate 35 and the first fixing plate 31. A first segment 331 is disposed between the second fixing plate 35 and the first fixing plate 31, and at least a portion of the second seal 70 is disposed between the first segment 331 and the first fixing plate 31. The second segment 332 passes through the first fixing plate 31 and the hollow area 12 on the housing 10 and connects to the circuit board 20. Since the seam between the first segment 331 and the first fixing plate 31 connects to the hollow area 12 through the seam between the second segment 332 and the first fixing plate 31, the second seal 70 seals the seam between the first segment 331 and the first fixing plate 31, effectively strengthening the sealing protection of the hollow area 12, while reducing wear on the first segment 331 from the first fixing plate 31, thus ensuring the reliability of the first segment 331.

[0069] For example, the second seal 70 can be a ring-shaped structure, that is, the structure of the second seal 70 is the same as that of the sealing ring 50 disposed between the first fixing plate 31 and the outer shell 10. The second seal 70 may include a first part 71 and a second part 72. The first part 71 abuts between the first fixing plate 31 and the second fixing plate 35, and the second part 72 abuts between the first segment 331 and the first fixing plate 31. The second seal 70 can seal the joint between the first segment 331 and the first fixing plate 31, and can also seal the joint between the first fixing plate 31 and the second fixing plate 35, thereby sealing and protecting the perforation of the second segment 332 through the first fixing plate 31.

[0070] In addition, since the second segment 332 needs to pass through the first fixing plate 31, sealant can be filled into the perforation of the first fixing plate 31 to achieve sealing of the second segment 332 within the perforation of the first fixing plate 31.

[0071] In this embodiment, the upper surface of the first fixing plate 31 may be provided with a groove for receiving the sealing ring 50, so as to limit and fix the sealing ring 50.

[0072] Please combine Figure 8 , Figure 8 for Figure 6The diagram shows an exploded view of the inductor 30 from another perspective. Further, the lower surface of the first fixing plate 31 is provided with a second groove 313. The structure of the second groove 313 is adapted to the structure of the second sealing member 70; that is, the second groove 313 is an annular groove. After the first fixing plate 31 and the second fixing plate 35 are connected and fixed, the second groove 313 accommodates the second sealing member 70 in a compressed state. That is to say, before assembly, the thickness of the second sealing member 70 is actually greater than the depth of the second groove 313. After being compressed, the second sealing member 70 within the second groove 313 is in a compressed state. One of the first fixing plate 31 and the second fixing plate 35 is provided with a third groove 351. The third groove 351 is adapted to and accommodates the first segment 331, and the depth of the third groove 351 is equal to the thickness of the first segment 331. The second groove 313 and the third groove 351 allow the second sealing element 70, located between the first fixing plate 31 and the second fixing plate 35, to be embedded in the first fixing plate 31. This also allows the first segment 331, located between the first fixing plate 31 and the second fixing plate 35, to be embedded in either the first fixing plate 31 or the second fixing plate 35. On one hand, this effectively positions the second sealing element 70 and the first segment 331, preventing them from shifting or detaching from the first fixing plate 31 and the second fixing plate 35. On the other hand, external impurities can penetrate into the hollow area 12 through the gap between the first fixing plate 31 and the second fixing plate 35. The second groove 313 and the third groove 351 increase the leakage path and make it more difficult for impurities to enter the interior of the outer casing 10, thereby improving the sealing and protection level of the interior of the outer casing 10.

[0073] Furthermore, by controlling the depth of the third groove 351, the surface of the third groove 351 can be flush with the first segment 331 contained within the third groove 351. For example, when the lower surface of the first fixing plate 31 is provided with the third groove 351, the lower surface of the first fixing plate 31 is flush with the lower surface of the first segment 331. In this way, the second fixing plate 35 can be fitted against the lower surface of the first fixing plate 31 for installation and fixation, reducing the gap between the first fixing plate 31 and the second fixing plate 35. At the same time, pressure is applied to the second sealing member 70 contained within the second groove 313, so that the second sealing member 70 within the second groove 313 is in a compressed state, and the first segment 331 contained within the third groove 351 is limited and fixed. For example, when the second fixing plate 35 has a third groove 351 on the side facing the first fixing plate 31, the surface of the second fixing plate 35 is flush with the upper surface of the first segment 331. When the second fixing plate 35 and the first fixing plate 31 are installed and fixed, the surface of the second fixing plate 35 can be installed close to the lower surface of the first fixing plate 31, reducing the gap between the second fixing plate 35 and the first fixing plate 31, and applying pressure to the second sealing member 70 housed in the second groove 313, so that the second sealing member 70 in the second groove 313 is in a compressed state, and limiting and fixing the first segment 331 housed in the third groove 351.

[0074] like Figure 8 As shown, for example, the third groove 351 is provided on the side of the first fixing plate 31 facing the second fixing plate 35, that is, both the third groove 351 and the second groove 313 are provided on the lower surface of the first fixing plate 31, and the third groove 351 communicates with the second groove 313. A portion of the second groove 313 is formed at the bottom of the third groove 351. For example, the second groove 313 includes a first sub-groove 3131 and a second sub-groove 3132 that communicate with each other. The first sub-groove 3131 receives the first part 71 of the second seal 70, and a portion of the second sub-groove 3132 is located at the bottom of the third groove 351, and the second sub-groove 3132 receives the second part 72 of the second seal 70. By opening a portion of the second groove 313 at the bottom of the third groove 351, the second seal 70 can be accommodated in the second groove 313, and the first segment 331 can also be accommodated in the third groove 351. The thickness of the first segment 331 is equal to the depth of the third groove 351, and the lower surface of the first segment 331 is flush with the lower surface of the first fixing plate 31. Thus, the lower surfaces of the first segment 331 and the lower surfaces of the first fixing plate 31 can be tightly attached to the second fixing plate 35.

[0075] Because the second seal 70 has a ring-shaped structure, and the first part 71 of the second seal 70 abuts between the first fixing plate 31 and the second fixing plate 35, and the second part 72 of the second seal 70 abuts between the first fixing plate 31 and the first segment 331. In the arrangement direction of the first fixing plate 31 and the second fixing plate 35, the first part 71 is closer to the second fixing plate 35 than the second part 72, resulting in a stepped surface between the second sub-groove 3132 and the first sub-groove 3131. In order for the second seal 70 to better fit against the side of the first segment 331 at the stepped surface, the second seal 70 is provided with a notch 73. The notch 73 is formed by a recess on the side of the second seal 70 facing the first segment 331. The notch 73 accommodates a portion of the first segment 331, and the two opposite walls of the notch 73 respectively contact the two opposite sides of the first segment 331. The two opposite sides of the first segment 331 connect the lower surface and the upper surface of the first segment 331. The notch 73 allows the second seal 70 to seal not only the joint between the upper surface of the first segment 331 and the first fixing plate 31, but also the joint between the two opposite sides of the first segment 331 and the first fixing plate 31, so as to prevent impurities from entering the hollow area 12 from these joints and improve the protection level of the inside of the outer shell 10.

[0076] like Figure 8 As shown, when the second seal 70 has a notch 73, in order to ensure the structural strength of the second part 72, the side of the second part 72 facing away from the second fixing plate 35 relative to the first part 71 is protruding, so that the thickness of the second part 72 and the thickness of the first part 71 can be kept as consistent as possible. The side of the second part 72 facing the first section 331 may have multiple spaced protrusions 721. When the protrusions 721 are compressed, they deform and contact the upper surface of the first section 331. The arrangement of multiple protrusions 721 upgrades the single sealing interface between the second part 72 and the first section 331 into multiple sealing lines, greatly improving the reliability and safety of the seal and reducing the risk of sudden failure.

[0077] For example, the second seal 70 can also be a sealing gasket, having a flat plate structure. The second seal 70 is positioned opposite the first segment 331, and seals the joint between the first segment 331 and the first fixing plate 31. To ensure a tight fit between the second fixing plate 35 and the first fixing plate 31, one of the two plates has a second groove 313. The second groove 313 accommodates the first segment 331 and the second seal 70 in a compressed state. For instance, the lower surface of the first fixing plate 31 has a second groove 313, and the lower surface of the first fixing plate 31 is flush with the lower surface of the first segment 331, allowing the portion of the lower surface of the first fixing plate 31 without the second groove 313 to fit against the second fixing plate 35. It is understood that the second sealing member 70, which has a flat plate structure, may have a groove on the side facing the first segment 331. The side wall around the groove can fit against the side of the first segment 331, thereby increasing the contact area between the second sealing member 70 and the first segment 331 and strengthening the seal at the joint between the first segment 331 and the first fixing plate 31.

[0078] Please see Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of another inductor 30 provided in an embodiment of this application. Figure 10 for Figure 9 The diagram shows an exploded view of the inductor 30. In one embodiment, the power converter 100 further includes a third seal 80, at least a portion of which is disposed between the first segment 331 and the second fixing plate 35. The third seal 80 seals the joint between the lower surface of the first segment 331 and the second fixing plate 35. To allow the second fixing plate 35 to be tightly mounted against the first fixing plate 31, the second fixing plate 35 is provided with a third groove 351. The third groove 351 accommodates the first segment 331 and the third seal 80 in a compressed state, wherein the side of the second fixing plate 35 with the third groove 351 is flush with the upper surface of the first segment 331. The third groove 351 allows the first segment 331 and the third seal 80, located between the first fixing plate 31 and the second fixing plate 35, to also be embedded in the second fixing plate 35. On the one hand, this effectively positions the first segment 331 and the third seal 80, preventing them from shifting or detaching from the first fixing plate 31 and the second fixing plate 35. On the other hand, external impurities can penetrate into the hollow area 12 through the gap between the first fixing plate 31 and the second fixing plate 35. The third groove 351 allows the second fixing plate 35 to be installed and fixed tightly against the first fixing plate 31, while also increasing the leakage path and making it more difficult for impurities to enter the interior of the housing 10, thereby improving the sealing and protection level of the interior of the housing 10.

[0079] For example, the third seal 80 is a sealing gasket with a flat structure. The third seal 80 is positioned opposite the first segment 331, so that the third seal 80 and the flat first segment 331 can be accommodated in the third groove 351.

[0080] For example, the third seal 80 with a flat structure has a receiving groove 81 on the side facing the second seal 70. The receiving groove 81 is adapted to and accommodates the first segment 331. The sidewall of the receiving groove 81 is in a compressed state and is in contact with the second seal 70.

[0081] The design of the receiving groove 81 allows its bottom wall (actually part of the third seal 80) to seal the gap between the lower surface of the first section 331 and the second fixing plate 35, while the sidewalls of the receiving groove 81 are in a compressed state. In fact, before assembly, the thickness of the sidewalls of the receiving groove 81 is greater than the depth of the third groove 351. When the second fixing plate 35 and the first fixing plate 31 are locked, the second seal 70 and the third seal 80 located between the second fixing plate 35 and the first fixing plate 31 are compressed, causing... The sidewall of the receiving groove 81 can fill the gap between the side of the first section 331 and the sidewall of the third groove 351 as much as possible, so that the sidewall of the receiving groove 81 (actually part of the third seal 80) is in close contact with the second seal 70, thereby achieving a seal between the side of the first section 331 and the sidewall of the third groove 351. By having the sidewall of the receiving groove 81 in contact with the first section 331, the leakage path can also be increased, making it more difficult for impurities to enter the interior of the housing 10, thereby strengthening the sealing protection inside the housing 10.

[0082] In this embodiment, the second sealing element 70 can be a ring-shaped structure, such as... Figure 10 As shown. The second seal 70 can also be a sealing gasket with a flat plate structure. Please refer to... Figure 11 , Figure 11 This is a partial structural schematic diagram of another inductor provided in an embodiment of this application. When both the second seal 70 and the third seal 80 are sealing gaskets, the second seal 70 is positioned directly opposite the upper surface of the first segment 331, and the third seal 80 is positioned directly opposite the lower surface of the first segment 331. In this way, when the second fixing plate 35 and the first fixing plate 31 are locked, both the second seal 70 and the third seal 80 can be subjected to force evenly, avoiding excessive local stress and helping to extend the service life of the second seal 70 and the third seal 80.

[0083] Please see Figure 12 , Figure 12This is a schematic diagram of the structure of another inductor 30 provided in an embodiment of this application. In one embodiment, the inductor 30 includes a first fixing plate 31, a magnetic core 32, and a coil 33. The first fixing plate 31 is connected to the outer casing 10, and a sealing ring 50 is provided between the first fixing plate 31 and the outer casing 10. The magnetic core 32 and the coil 33 are both located on the side of the first fixing plate 31 facing away from the outer casing 10.

[0084] Please combine Figure 13 , Figure 13 for Figure 12 The diagram shows another structural view of the inductor 30. A mounting groove 314 is provided on the lower surface of the first fixing plate 31. A first segment 331 is located on the side of the first fixing plate 31 facing the magnetic core 32, and a portion of the second segment 332 extends into the mounting groove 314. The inductor 30 also includes an adapter 36, which is embedded in the first fixing plate 31. For example, a portion of the adapter 36 is embedded inside the plastic forming the first fixing plate 31 using an insert injection molding process. After the plastic cures, the first fixing plate 31 and the adapter 36 form a tight enclosure, thereby ensuring a seal between the first fixing plate 31 and the adapter 36. A portion of the adapter 36 is exposed on the upper surface of the first fixing plate 31, and the exposed adapter 36 is connected to the circuit board 20. A portion of the adapter 36 is located within the mounting groove 314, and the adapter 36 located within the mounting groove 314 is connected to the second segment 332. The exposed adapter 36 can pass through the cutout area 12 of the housing 10 and connect to the circuit board 20 inside the housing 10. Alternatively, the exposed adapter 36 can be positioned directly opposite the cutout area 12 of the housing 10, and the exposed adapter 36 can be located outside the housing 10.

[0085] Please combine Figure 3 In this embodiment, the inductor 30 is entirely located outside the housing 10. When the inductor 30 is assembled with the housing 10, the upper surface of the first fixing plate 31 can be directly connected to the housing 10, and a sealing ring 50 is provided between the upper surface of the first fixing plate 31 and the housing 10. On the upper surface of the first fixing plate 31, the sealing ring 50 is arranged around the outer periphery of the fastener 34 and the exposed portion of the adapter 36, and the joints between the fastener 34 and the housing 10, the fastener 34 and the first fixing plate 31, and the adapter 36 and the hollow area 12 are all surrounded by the sealing ring 50, achieving a high level of protective sealing for the interior of the housing 10. Furthermore, the adapter 36 exposed on the first fixing plate 31 is positioned directly opposite the hollow area 12 on the outer shell 10. The size of the hollow area 12 can be designed according to the size of the exposed adapter 36. This eliminates the need for the first fixing plate 31 to extend into the interior of the outer shell 10, thereby reducing the opening area of ​​the hollow area 12 on the outer shell 10 and increasing the difficulty for impurities to enter the interior of the outer shell 10 through the hollow area 12. In addition, it can effectively shorten the circumference of the sealing ring 50 that seals the hollow area 12, reducing the sealing difficulty.

[0086] For example, the second segment 332 and the adapter 36 can be fixed together by screws. In order to prevent impurities from entering the hollow area 12 from the joint between the second segment 332 and the adapter 36, sealant can be injected into the mounting groove 314 to achieve a seal between the second segment 332 and the adapter 36.

[0087] In other embodiments, the first fixing plate 31 extends into the housing 10 through the hollow area 12 of the housing 10, and the outer peripheral edge of the upper surface of the first fixing plate 31 is recessed to reserve installation space for the sealing ring 50.

[0088] Please combine Figure 5 , Figure 6 , Figure 9 and Figure 11 To secure the magnetic core 32, the inductor 30 also includes a third fixing plate 37, which is disposed on the side of the magnetic core 32 away from the first fixing plate 31. The third fixing plate 37 is connected and fixed to one of the first fixing plate 31 and the second fixing plate 35 by a locking member 38.

[0089] like Figure 5 As shown, for example, when the inductor 30 is not provided with the second fixing plate 35, a magnetic core 32 is provided between the third fixing plate 37 and the first fixing plate 31. The third fixing plate 37 is connected and fixed to the first fixing plate 31 by a locking member 38, thereby fixing the magnetic core 32 between the first fixing plate 31 and the second fixing plate 35, achieving an exposed arrangement of the magnetic core 32 and the coil 33. The four corners of the upper surface of the first fixing plate 31 are recessed to provide installation positions for the locking member 38, so that the bottom wall of the recessed portion is connected and fixed to the locking member 38. Thus, when the locking member 38 locks the first fixing plate 31 and the third fixing plate 37, it will not affect the installation of the sealing ring 50 located between the upper surface of the first fixing plate 31 and the outer casing 10. Both the first fixing plate 31 and the third fixing plate 37 are provided with slots. The slots are adapted to the magnetic core 32 to restrict the position of the magnetic core 32. The magnetic core 32 is pre-fixed by applying glue in the slots. Then, the magnetic core 32 is pressed between the first fixing plate 31 and the third fixing plate 37 by the outer locking member 38.

[0090] like Figure 6 , Figure 9 as well as Figure 11As shown, for example, when a second fixing plate 35 is provided between the first fixing plate 31 and the magnetic core 32, the magnetic core 32 is located between the second fixing plate 35 and the third fixing plate 37. The third fixing plate 37 is connected and fixed to the second fixing plate 35 by a locking member 38, thereby fixing the magnetic core 32 between the third fixing plate 37 and the second fixing plate 35, achieving an exposed setting for the magnetic core 32 and the coil 33. Both the second fixing plate 35 and the third fixing plate 37 are provided with slots that are adapted to the magnetic core 32 to restrict the position of the magnetic core 32. The magnetic core 32 is pre-fixed by applying adhesive to the slots, and then the magnetic core 32 is pressed between the second fixing plate 35 and the third fixing plate 37 by the outer locking member 38.

[0091] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power converter, characterized in that, Includes the outer casing, circuit board, inductor, sealing ring, and protective shell; The outer casing is connected to the protective shell, and the outer casing houses the circuit board; The circuit board is equipped with a power conversion circuit, which is used to convert direct current from photovoltaic modules or energy storage batteries into alternating current. The inductor is housed within the protective housing. The inductor includes a first fixing plate, a magnetic core, and a coil. The first fixing plate is connected to the housing via fasteners. The magnetic core and the coil are exposed within the protective housing. The magnetic core is connected to the first fixing plate, and the coil is wound around the magnetic core. The lead-out end of the coil includes a first section and a second section connected together. The first section is located on the side of the first fixing plate facing the magnetic core, or the first section is located on the side of the first fixing plate away from the magnetic core. The second section is bent relative to the first section and passes through the hollow area of ​​the housing. The second section is connected to the circuit board. The sealing ring is disposed between the first fixing plate and the outer shell, and the sealing ring surrounds the fastener and the outer periphery of the second segment that passes through the hollow area.

2. The power converter according to claim 1, characterized in that, When the first segment is located on the side of the first fixing plate away from the magnetic core, the side of the first segment away from the magnetic core contacts the sealing ring.

3. The power converter according to claim 2, characterized in that, The power converter further includes a first seal, at least a portion of which is disposed between the first section and the first fixing plate; The first fixing plate has a first groove on the side facing away from the magnetic core, and the first groove accommodates the first segment and the first sealing member in a compressed state; The side of the first fixing plate with the first groove is flush with the side of the first segment that is away from the magnetic core.

4. The power converter according to claim 3, characterized in that, The first seal has a receiving groove on the side facing the first segment. The receiving groove is adapted to and accommodates the first segment. The sidewall of the receiving groove is in a compressed state and is in contact with the sealing ring.

5. The power converter according to claim 1, characterized in that, The inductor further includes a second fixing plate, which is disposed between the first fixing plate and the magnetic core. The second fixing plate is connected to the first fixing plate, and the side of the second fixing plate facing away from the first fixing plate is connected to the magnetic core. The power converter further includes a second sealing member, which is disposed between the second fixing plate and the first fixing plate. The first segment is located between the second fixing plate and the first fixing plate, and at least a portion of the second sealing element is located between the first segment and the first fixing plate.

6. The power converter according to claim 5, characterized in that, The second seal is a ring-shaped structure, and a portion of the second seal abuts between the first fixing plate and the second fixing plate; The first fixing plate is provided with a second groove, which is adapted to the second sealing member and accommodates the second sealing member in a compressed state; One of the first fixing plate and the second fixing plate is provided with a third groove, the third groove is adapted to and accommodates the first segment, and the depth of the third groove is equal to the thickness of the first segment.

7. The power converter according to claim 6, characterized in that, When both the second groove and the third groove are provided on the first fixing plate, a portion of the second groove is provided at the bottom of the third groove.

8. The power converter according to claim 6 or 7, characterized in that, The second seal has a notch that receives a portion of the first segment, and the two opposite walls of the notch contact the two opposite sides of the first segment.

9. The power converter according to claim 5, characterized in that, The second seal is a ring-shaped structure, and a portion of the second seal abuts between the first fixing plate and the second fixing plate; the first fixing plate has a second groove on the side facing the magnetic core, and the second groove is adapted to the second seal and accommodates the second seal in a compressed state; The power converter further includes a third seal, at least a portion of which is disposed between the first segment and the second fixing plate; the second fixing plate is provided with a third groove that accommodates the first segment and the third seal in a compressed state; The side of the second fixing plate with the third groove is flush with the side of the first segment that is away from the magnetic core.

10. The power converter according to claim 9, characterized in that, The third seal has a receiving groove on the side facing the second seal. The receiving groove is adapted to and accommodates the first segment. The sidewall of the receiving groove is in a compressed state and is in contact with the second seal.

11. The power converter according to claim 5, characterized in that, The second seal is positioned opposite the first segment; the first fixing plate has a second groove, which accommodates the second seal in a compressed state; The power converter further includes a third seal, which is disposed between the first segment and the second fixing plate, and is positioned opposite to the first segment. The second fixing plate has a third groove that accommodates the first segment and the third seal in a compressed state. The side of the second fixing plate with the third groove is flush with the side of the first segment that is away from the magnetic core.

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