Power converter and power system

Abstract

The application discloses a power converter and a power system, and belongs to the technical field of power electronics, and is used for solving the problems of low anti-interference ability of the power converter to the external electromagnetic environment and easy electromagnetic compatibility, wherein the power converter comprises a box body; the direct-current wiring terminals are two and are arranged at intervals, one of which is a positive direct-current wiring terminal and the other of which is a negative direct-current wiring terminal, each direct-current wiring terminal is arranged in the box body and partially located in the box body; the electric connection components are two groups and are arranged in the box body at intervals; the filter board comprises a board body arranged in the box body and a filter circuit arranged on the board body; and each direct-current wiring terminal is electrically connected with the filter circuit through the corresponding electric connection component.

Description

Technical Field

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

[0002] A power converter is an electronic device used to change the form or parameters of electrical energy. Its main function is to convert one form of electrical energy (such as voltage, current, frequency, AC / DC, etc.) into another form to meet the power needs of different devices or systems.

[0003] In some technologies, an external DC power supply is typically connected to the power converter via DC terminals for voltage conversion or power processing by subsequent circuits. However, in practical applications, the input DC power supply is often not ideally pure DC; it usually carries a certain amount of high-frequency noise, electromagnetic interference, and voltage ripple, which reduces the power converter's immunity to external electromagnetic interference and can easily lead to electromagnetic compatibility issues. Utility Model Content

[0004] This application provides a power converter and power system to solve the problem that the power converter has low immunity to external electromagnetic environment and is prone to electromagnetic compatibility issues.

[0005] To achieve the above objectives, according to a first aspect of this application, a power converter is provided, comprising: Box; The DC terminal block has two terminals spaced apart, one of which is a positive DC terminal block and the other is a negative DC terminal block. Each DC terminal block is installed in the enclosure and partially located inside the enclosure. The electrical connection assembly has two sets arranged at intervals inside the housing; The filter board includes a board body disposed within a housing and a filter circuit disposed within the board body; each DC terminal is electrically connected to the filter circuit via a corresponding electrical connection component.

[0006] In some embodiments of this application, the electrical connection assembly includes conductive posts for supporting the plate on DC terminals and for electrically connecting the conductive posts to a filter circuit.

[0007] In some embodiments of this application, the electrical connection assembly further includes a plate end connector; in the same group of electrical connection assemblies, at least one of the plate end connector and the conductive post is disposed through the plate body, and the plate end connector and the conductive post are fixedly connected to fix the plate body on the DC terminal block.

[0008] In some embodiments of this application, the conductive post has an internally threaded hole on its end face near the plate; the plate end connector includes a plate end screw, the screw shank of which passes through the plate and is threadedly connected to the internally threaded hole, so that the plate is sandwiched between the head of the plate end screw and the end face of the conductive post.

[0009] In some embodiments of this application, the power converter further includes: The temperature sensing element is housed inside the enclosure and is electrically connected to the temperature sensing circuit located on the board. The temperature sensing element is used to detect the temperature of the DC terminal block.

[0010] In some embodiments of this application, each electrical connection component includes a conductive post, a temperature sensing element is disposed on the board, and the board is electrically and thermally connected to the DC terminal block through the corresponding conductive post.

[0011] In some embodiments of this application, the temperature sensing element is disposed on the board, and the power converter further includes a heat-conducting structure that thermally connects the DC terminal block and the board.

[0012] In some embodiments of this application, the temperature sensing element is disposed on a DC terminal and is in thermal contact with the DC terminal; the power converter also includes a conductive wire that electrically connects the temperature sensing element and the temperature sensing circuit.

[0013] In some embodiments of this application, at least two temperature sensing elements are used, wherein at least one temperature sensing element is used to detect the temperature of the positive DC terminal and at least another temperature sensing element is used to detect the temperature of the negative DC terminal.

[0014] In some embodiments of this application, the power converter further includes: A DC transmission cable has two terminals, one a positive DC transmission cable and the other a negative DC transmission cable. The power processing module, housed within the enclosure, includes power conversion circuitry and power devices; among which, One end of each DC transmission cable is electrically connected to the corresponding DC terminal, and the other end is electrically connected to the power conversion circuit.

[0015] In some embodiments of this application, each DC terminal includes a pluggable board connector and a wire connector; the board connector passes through the enclosure and is partially located inside the enclosure, and is electrically connected to the power conversion circuit through a corresponding DC transmission cable; the wire connector is located outside the enclosure and is used for electrical connection with external cables.

[0016] In some embodiments of this application, each electrical connection component includes a conductive post, one end of which is electrically connected to a filter circuit, and the other end of which is threaded to the conductive part of a board-end connector and the lug of a DC transmission cable.

[0017] In some embodiments of this application, the housing has a side plate for mounting DC terminals, and the power converter further includes: The shielding cover is connected to the enclosure. The shielding cover has an opening and a cable pass-through port. The opening faces the side panel to jointly enclose and form a shielding space. The cable pass-through port is used for DC transmission cables to pass through. The part of the DC terminal block located inside the enclosure, the electrical connection components, the filter board, and the connection part between the DC transmission cable and the DC terminal block are all located within the shielding space.

[0018] In some embodiments of this application, the opening and the wiring port are respectively provided on adjacent sidewalls of the shielding cover, and the opening and the wiring port are connected to each other.

[0019] In some embodiments of this application, the power converter further includes: The grounding structure connects the filter circuit and the enclosure, and the enclosure is grounded.

[0020] In some embodiments of this application, the grounding structure includes: The first grounding component is electrically connected to the filter circuit and the shielding cover; The second grounding component is electrically connected to the shield and the enclosure.

[0021] In some embodiments of this application, the first grounding element includes a grounding post and a fastener; a grounding part is provided on the plate, and one end of the grounding post is electrically connected to the filter circuit through the grounding part; the fastener passes through the shield and fixes the shield and the other end of the grounding post.

[0022] In some embodiments of this application, the board body is provided with two conductive connection portions and a grounding portion disposed between the two conductive connection portions; the grounding portion and the two conductive connection portions are electrically isolated from each other; the filter circuit is electrically connected to the grounding structure through the grounding portion and to the corresponding electrical connection component through the conductive connection portion.

[0023] According to a second aspect of this application, an electric power system is provided, comprising: The power converter described in any of the above technical solutions; The battery pack has a positive terminal and a negative terminal, with the positive terminal electrically connected to a positive DC terminal and the negative terminal electrically connected to a negative DC terminal.

[0024] The power converter in this application embodiment has at least the following beneficial effects through the above technical solution: In this technical solution, a filter circuit is set at the DC input terminal, and two sets of spaced electrical connection components are used to achieve a reliable electrical connection between the two DC terminals (positive DC terminal and negative DC terminal) and the filter circuit. The design of the filter circuit can effectively suppress high-frequency noise, electromagnetic interference and voltage ripple in the input DC power, thereby improving the quality of the input power supply, enhancing the anti-interference performance of the power converter, improving electromagnetic compatibility to ensure the stable operation of the subsequent circuit, and improving the reliability of the power converter in complex electromagnetic environments.

[0025] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0027] Figure 1 This is a perspective view of the power converter in the embodiments of this application; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 This is an exploded view of the power converter in the embodiments of this application; Figure 4 This is an exploded view of the electrical connection components in the power converter in the embodiments of this application; Figure 5 This is a schematic diagram showing the installation position of the temperature sensing element in the power converter in this embodiment of the application; Figure 6 This is a perspective view of the power converter including the shielding cover in the embodiments of this application; Figure 7 yes Figure 6 Enlarged schematic diagram of part B in the middle; Figure 8 This is a perspective view of the shielding cover in the power converter in the embodiments of this application; Figure 9 This is a perspective view of the power converter including the grounding structure in the embodiments of this application; Figure 10 yes Figure 9 An enlarged schematic diagram of section C; Figure 11 This is a schematic diagram of the power system structure in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures: 1-Enclosure; 11-Side panel; 2-DC terminal block; 21-Board connector; 211-Conductive part; 22-Wire connector; 3-Electrical connection assembly; 31-Conductive post; 311-Internal threaded hole; 32-Board connector; 321-Board screw; 3211-Screw part; 3212-Head; 4-Filter board; 41-Board body; 411-Conductive connection part; 412-Grounding part; 42-Filtering component; 5-Temperature sensing element ; 51-Conductive wire; 6-DC transmission cable; 7-Power processing module; 8-Shielding cover; 81-Opening; 82-Wire threading port; 83-Shielding space; 84-Mounting flange; 841-Mounting hole; 9-Grounding structure; 91-First grounding component; 911-Grounding post; 912-Fastener; 92-Second grounding component; 10-Power converter; 20-Battery pack; 201-Positive port; 202-Negative port; 30-External cable. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] This application provides a power converter and a power system, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0034] A power converter is an electronic device used to change the form or parameters of electrical energy. Its main function is to convert one form of electrical energy (such as voltage, current, frequency, AC / DC, etc.) into another form to meet the power needs of different devices or systems.

[0035] In some technologies, an external DC power supply is typically connected to the power converter via DC terminals for voltage conversion or power processing by subsequent circuits. However, in practical applications, the input DC power supply is often not ideally pure DC; it usually carries a certain amount of high-frequency noise, electromagnetic interference, and voltage ripple, which reduces the power converter's immunity to external electromagnetic interference and can easily lead to electromagnetic compatibility issues.

[0036] Please refer to Figure 1 and Figure 2 The power converter 10 includes a housing 1, DC terminals 2, electrical connection components 3, and a filter board 4. There are two DC terminals 2 spaced apart, one being a positive DC terminal and the other a negative DC terminal. Each DC terminal 2 passes through the housing 1 and is partially located inside the housing 1. There are two sets of electrical connection components 3 spaced apart within the housing 1. The filter board 4 includes a plate 41 disposed within the housing 1 and a filter circuit disposed on the plate 41; each DC terminal 2 is electrically connected to the filter circuit through a corresponding electrical connection component 3.

[0037] In this technical solution, a filter circuit is set at the DC input terminal, and two sets of spaced electrical connection components 3 are used to realize a reliable electrical connection between the two DC terminals 2 (positive DC terminal and negative DC terminal) and the filter circuit. The design of the filter circuit can effectively suppress high-frequency noise, electromagnetic interference and voltage ripple in the input DC power, thereby improving the quality of the input power supply, enhancing the anti-interference performance of the power converter 10, improving electromagnetic compatibility to ensure the stable operation of the subsequent circuit, and improving the working reliability of the power converter 10 in complex electromagnetic environments.

[0038] Specifically, enclosure 1 serves as both mechanical support and electrical protection. Both positive and negative DC terminals are installed within enclosure 1. A portion of the positive and negative DC terminals are located inside enclosure 1, while the other portion is located outside enclosure 1 for connection to external cables 30 (see label). Figure 11 Electrical connections. The positive and negative DC terminals are spaced apart to avoid short-circuit risks or electromagnetic interference that might arise from close proximity, thus improving electrical safety and interference resistance. Each electrical connection component 3 is only electrically connected to the portion of the DC terminal 2 of one polarity located within the housing 1 (one connected to the positive DC terminal, and one to the negative DC terminal), ensuring that the two current paths do not interfere with each other and reducing the probability of system failures due to wiring errors, poor contact, or other problems.

[0039] like Figure 3 As shown, in this embodiment, each electrical connection component 3 includes a conductive post 31. The conductive posts 31 in both electrical connection components 3 are used together to support the plate 41 on the DC terminal 2 and are both electrically connected to the filter circuit. That is, the conductive post 31 serves as both an electrical connector and a mechanical support, achieving an integrated design of structure and function. Specifically, in terms of electrical connection, the electrical energy of the positive and negative DC terminals is reliably conducted to the filter circuit through their respective conductive posts 31, ensuring a smooth current path and improving the stability and conductivity of the electrical connection. In terms of mechanical support, the two conductive posts 31 jointly support the plate 41 of the filter plate 4, positioning it securely above or near the DC terminal 2 without the need for additional mechanical support structures, simplifying the overall assembly.

[0040] Therefore, in this embodiment, by using conductive posts 31 as the electrical connection structure, not only is an efficient and reliable electrical connection achieved between the positive and negative DC terminals 2 and the filter circuit, but also mechanical support is provided for the filter board 41. This simplifies the overall structural design of the power converter 10, improves assembly efficiency, enhances the stability of the electrical connection and the mechanical robustness of the system, optimizes the spatial layout, and achieves efficient integration of structure and function. Furthermore, since the conductive posts 31 can directly support / position the filter board 41 above or near the DC terminals 2, the filter circuit and the DC terminals 2 are physically very close, shortening the current transmission distance and bringing the filter circuit closer to the DC terminals 2, thereby shortening the signal transmission distance and improving the filtering effect and system electrical performance. It is understood that in the power converter 10, the filtering path refers to the current or signal transmission path from the input DC source (such as the DC terminals 2) to the filter circuit (the circuit part that performs the filtering function, such as capacitors, inductors, etc.).

[0041] For example, during assembly, simply aligning the filter plate 41 with the conductive post 31 and fixing it in place simultaneously achieves both mechanical and electrical connections. Meanwhile, compared to traditional wire connection methods, the conductive post 31 has lower contact resistance and higher current-carrying capacity, providing a more reliable electrical connection and greater current transmission capability.

[0042] Please continue to refer to Figure 3 In this embodiment, each electrical connection assembly 3 includes a plate-end connector 32. In the same group of electrical connection assemblies 3, the plate-end connector 32 and the conductive post 31 are respectively disposed on opposite sides of the plate body 41, with at least one of the plate-end connector 32 and the conductive post 31 passing through the plate body 41. The plate-end connector 32 and the conductive post 31 are fixedly connected to securely support the plate body 41 on the DC terminal block 2. That is, the plate body 41 of the filter board 4 is not only spatially supported and positioned by the conductive post 31, but also directly electrically and mechanically connected through the plate-end connector 32 and the conductive post 31, ensuring a stable and reliable electrical connection path between the filter circuit of the filter board 4 and the DC terminal block 2, and preventing loosening, incomplete connection, or poor contact at the connection point between the filter circuit and the DC terminal block 2.

[0043] Please combine Figure 3 and Figure 4In this embodiment, the conductive post 31 has an internally threaded hole 311 on its end face near the plate 41. The plate end connector 32 includes a plate end screw 321, the screw portion 3211 of which passes through the plate 41 and is threadedly connected to the internally threaded hole 311, so that the plate 41 is clamped between the head 3212 of the plate end screw 321 and the end face of the conductive post 31. Thus, the plate 41 is securely clamped between the top of the conductive post 31 near the plate 41 and the stop portion of the plate end connector 32. This double-sided clamping structure can provide effective mechanical clamping force, which can not only prevent the filter plate 4 from shifting or falling off in the thickness direction of the plate 41, but also effectively limit its offset or rotation in the horizontal plane parallel to the plate 41, thereby significantly improving the stability and positioning accuracy of the overall structure. Furthermore, the plate end connector 32 not only serves the mechanical fixing function of the filter plate 4, but also achieves direct electrical conduction or a stable structural connection between the two through its screw portion 3211 and the conductive post 31, further enhancing the electrical connection reliability and structural integrity of the system. Specifically, the plate body 41 is provided with two through holes extending along its thickness direction. The axis of one through hole coincides with the axis of one conductive post 31, and the other through hole coincides with the axis of another conductive post 31. These through holes are used to form a conductive connection portion 411 to realize the electrical connection between the filter circuit and the conductive post 31.

[0044] In other embodiments, the plate end connector 32 is a crimp nut provided on the plate body 41, and the outer periphery of the conductive post 31 near the plate body 41 is provided with an external thread section. The crimp nut and the external thread section of the conductive post 31 are threadedly connected, thereby realizing the stable mechanical positioning and reliable assembly of the filter plate 4, which has a compact structure and is easy to assemble.

[0045] As one example of this application, the conductive post 31 is welded to a conductor on the board 41 to achieve electrical conductivity between them. For example, the conductor may include, but is not limited to, pads, copper foil areas, or vias on the board 41. As another example of this application, the top of the conductive post 31 may have a flared, tapered, embossed, or elastic structure, allowing it to be directly pressed into a metallized via on the board 41, achieving a stable connection and electrical conductivity through mechanical pressure. As yet another example of this application, the top of the conductive post 31 is bonded and fixed to a copper foil area, pad, or conductive area on the board 41 using conductive adhesive (such as silver paste, copper paste, etc.), which simultaneously serves as both structural bonding and conductive connection.

[0046] In some embodiments, the power converter 10 further includes a temperature sensing element 5. The temperature sensing element 5 is disposed inside the housing 1 and electrically connected to a temperature sensing circuit disposed on the plate 41. The temperature sensing element 5 is used to detect the temperature of the DC terminal 2. Specifically, the temperature sensing element 5 (such as a thermistor, temperature sensor, etc.) is installed inside the housing 1 and is disposed close to or in direct contact with the DC terminal 2 for real-time monitoring of temperature changes of the DC terminal 2.

[0047] In practical applications, the DC terminal 2 (including the positive and negative DC terminal) is a crucial interface in the power converter 10 for connecting to external DC power sources (such as batteries and photovoltaic modules), and typically carries high currents during operation. Due to factors such as contact resistance and current-induced thermal effects, the DC terminal 2 is prone to localized temperature rise during prolonged operation or under abnormal conditions. Real-time temperature monitoring via the temperature detection element 5 allows the power system to issue timely alarms when temperatures exceed limits, effectively preventing overheating risks and improving the safety and reliability of the power converter 10 in high-power scenarios. Furthermore, this design effectively identifies current-carrying temperature rise problems caused by poor contact in the DC terminal 2, enabling early anomaly detection and reporting, thereby enhancing the operational safety, reliability, and fault warning capabilities of the power converter 10.

[0048] For example, please combine Figure 2 and Figure 4 Each electrical connection component 3 includes a conductive post 31, and a temperature sensing element 5 is disposed on the plate 41. The plate 41 is electrically and thermally connected to the DC terminal 2 through the corresponding conductive post 31. That is, the conductive post 31 not only serves as part of the current path but also undertakes the function of heat conduction, thereby integrating electrical connection and heat conduction functions into the same component, simplifying the overall structural design, and improving the integration and space utilization of the power converter 10. Specifically, the DC terminal 2 (usually carrying a large current) may generate heat during operation due to factors such as contact resistance and current thermal effects. This heat can be efficiently conducted to the plate 41 through the conductive post 31, enabling the temperature sensing element 5 disposed on the plate 41 to more accurately sense the true temperature of the DC terminal 2, avoiding temperature sensing lag or measurement errors caused by excessive thermal resistance or excessively long heat transfer paths, thereby improving the reliability and response speed of temperature monitoring. For example, the conductive post 31 is made of conductive and thermally conductive materials, such as copper, copper alloy, iron, aluminum, etc.

[0049] As an example of this application, the temperature sensing element 5 is disposed on the board 41, and the power converter 10 also includes a heat-conducting structure that thermally connects the DC terminal 2 and the board 41. For example, the heat-conducting structure is disposed between the DC terminal 2 and the board 41, and it can be a thermal pad, thermal grease, or thermal adhesive. By filling the air gap between the DC terminal 2 and the board 41, the contact thermal resistance between the two is reduced, and the heat of the DC terminal 2 is efficiently conducted to the board 41, so that the temperature sensing element 5 can more accurately and quickly sense the true temperature of the DC terminal 2.

[0050] As another example of this application, such as Figure 5 As shown, the temperature sensing element 5 is disposed on the DC terminal 2 and is in thermal contact with the DC terminal 2. The power converter 10 also includes a conductive wire 51, which electrically connects the temperature sensing element 5 and the temperature sensing circuit. In this technical solution, the temperature sensing element 5 is in close contact with the DC terminal 2, enabling it to directly sense the true temperature of the DC terminal 2 without relying on complex heat conduction paths or intermediate media. This avoids, to a certain extent, the thermal resistance, thermal delay, or temperature attenuation caused by intermediate heat conduction paths, thus improving the real-time performance and accuracy of temperature sensing. For example, the temperature sensing element 5 is disposed on the conductive part 211, which is electrically connected to the filter circuit of the DC terminal 2. The DC terminal 2 is the entrance for external high current, and the current entering the filter circuit needs to pass through the conductive part 211 (disposed on the board connector 21). If there is poor contact, the conductive busbar will locally overheat. Therefore, by arranging the temperature sensing element 5 on the conductive part 211, the true temperature of this critical connection point can be sensed in a timely manner, and temperature rise caused by poor contact or abnormal connection can be detected earlier.

[0051] Based on any of the above embodiments, the temperature sensing element 5 has at least two components, wherein at least one temperature sensing element 5 is used to detect the temperature of the positive DC terminal, and at least another temperature sensing element 5 is used to detect the temperature of the negative DC terminal. By adopting the above design and setting at least two temperature sensing elements 5 to monitor the temperatures of the positive and negative DC terminals respectively, accurate temperature monitoring of critical electrical connection points can be achieved, local overheating risks can be detected in a timely manner, system safety, reliability, and fault diagnosis capabilities can be improved, thermal runaway and equipment damage can be prevented, and high safety standards can be met.

[0052] For example, in an embodiment where each electrical connection assembly 3 includes a conductive post 31 and a plate-end connector 32, at least one temperature sensing element 5 is disposed on the outer periphery of one plate-end connector 32, and the two are arranged close to each other. At least another temperature sensing element 5 is disposed on the outer periphery of another plate-end connector 32, and the two are arranged close to each other. This allows the temperature sensing element 5 to more accurately sense the true temperature corresponding to the plate-end connector 32 and the DC terminal 2 thermally connected to it via the conductive post 31, improving the accuracy and reliability of temperature monitoring.

[0053] Please refer to Figure 6 In this embodiment, the power converter 10 further includes a DC transmission cable 6 and a power processing module 7. The DC transmission cable 6 has two wires, a positive DC transmission cable and a negative DC transmission cable. The power processing module 7 is housed within the enclosure 1 and includes a power conversion circuit and power devices. One end of each DC transmission cable 6 is electrically connected to the corresponding DC terminal 2, and the other end is electrically connected to the power conversion circuit, thus forming a complete power input path and enabling reliable power transmission from the outside to the inside. Simultaneously, using independent positive and negative DC transmission cables, connecting the positive and negative terminals of the DC terminal 2 to the power processing module 7 respectively, makes the power path more direct, reducing unnecessary intermediate connections or complex wiring, thereby effectively reducing parasitic resistance and inductance, and improving power transmission efficiency and system electrical performance.

[0054] Please continue to refer to Figure 3 In this embodiment, each DC terminal 2 includes a pluggable board-end connector 21 and a wire-end connector 22. The board-end connector 21 passes through the housing 1 and is partially located inside the housing 1, and is electrically connected to the power conversion circuit via a corresponding DC transmission cable 6. The wire-end connector 22 is located outside the housing 1 and is used to connect to external cables 30 (see reference numerals). Figure 11 Electrical connection. That is, the DC terminal 2 adopts a pluggable structure, which includes a wire end connector 22 located outside the enclosure 1 for connecting external cables 30 and a board end connector 21 passing through the enclosure 1. The board end connector 21 is electrically connected to the power conversion circuit through the internal DC transmission cable 6, realizing electrical safety isolation between the inside and outside of the enclosure 1, facilitating plug-and-play modular expansion, and improving the configuration flexibility of the power converter 10.

[0055] Please combine Figure 3 and Figure 4Each electrical connection component 3 includes a conductive post 31. One end of the conductive post 31 is electrically connected to the filter circuit disposed on the board body 41, and the other end of the conductive post 31 is threadedly connected to the conductive part 211 of the board end connector 21 and the lug 61 of the DC transmission cable 6. The two ends of the conductive post 31 are used to connect the filter circuit and the power conversion circuit electrically connected to the DC transmission cable 6, respectively. This design realizes a modular and reliable electrical connection between the filter circuit and the power conversion circuit, which not only improves the stability of the electrical connection, assembly efficiency and maintenance convenience, but also enhances the system integration and optimizes the internal structural layout and functional expansion capabilities.

[0056] Please combine Figure 3 , Figures 6 to 8 In some embodiments, the housing 1 has a side plate 11 for mounting DC terminals 2. The power converter 10 also includes a shield 8 connected to the housing 1. The shield 8 has an opening 81 and a cable pass-through port 82. The opening 81 faces the side plate 11 to jointly enclose a shielding space 83, and the cable pass-through port 82 is used for each DC transmission cable 6 to pass through. The portion of the DC terminals 2 located inside the housing 1, the electrical connection assembly 3, the filter plate 4, and the connection portion of the DC transmission cable 6 to the DC terminals 2 are all disposed within the shielding space 83. In other words, the DC terminal block 2, electrical connection assembly 3, filter board 4, and the connection point (also understood as the lug of the DC transmission cable 6) to the DC terminal block 2 are all enclosed or semi-enclosed within a metal enclosure. This effectively blocks external electromagnetic interference from entering the shielded space 83, while suppressing the outward radiation of internal interference such as common-mode current of the DC terminal block 2 and filter operating noise within the shielded space 83. This reduces the electromagnetic interference (EMI) and conducted interference (CE / RE) levels of the power converter 10, improving its electromagnetic compatibility (EMC) performance. Furthermore, the shield 8 reduces interference coupling paths between different circuits within the power converter 10, enhances interference isolation between functional circuits, and optimizes the electromagnetic environment of signal and power transmission paths, thereby improving the stability and reliability of each circuit module.

[0057] For example, such as Figure 7 and Figure 8As shown, the opening 81 and the wiring port 82 on the shielding cover 8 are respectively located on adjacent side walls of the shielding cover 8, and the opening 81 and the wiring port 82 are interconnected. In the specific assembly process, the DC transmission cable 6 is first connected to the DC terminal block 2 to ensure that the electrical connection between the two is correct, secure, and reliable. Then, the shielding cover 8 is installed, and the connected DC transmission cable 6 is introduced through the opening 81 on the shielding cover 8. A portion of the DC transmission cable 6 is then inserted into the shielding cover 8 through the connected wiring port 82, while the other portion extends out of the shielding cover 8. Finally, the shielding cover 8 is connected to the housing 1, thus sealing the shielding space 83. Using the above assembly sequence avoids the problem of difficulty in connecting or inconvenient connection of the DC transmission cable 6 caused by installing the shielding cover 8 first, which is beneficial for improving assembly efficiency and operational convenience, while reducing the risk of errors caused by improper assembly sequence.

[0058] Please combine Figure 2 , Figure 9 and Figure 10 In this embodiment, the power converter 10 also includes a grounding structure 9, which is electrically connected to the filter circuit and the housing 1. The housing 1 is grounded, thereby achieving reliable grounding of the filter circuit on the filter board 4. The filter circuit, as a key structure for suppressing electromagnetic interference, typically integrates filter components 42 such as common-mode inductors and X / Y capacitors. Grounding provides a unified, low-impedance reference ground for all filter components 42 on the board 41, enabling the filter components 42 to operate stably and reliably, thus more effectively filtering out interference signals entering the power path. Furthermore, after the filter circuit is grounded, interference can be more efficiently diverted to ground instead of entering sensitive circuits, thereby improving the overall anti-interference capability and operational stability of the power converter 10 and reducing the occurrence of problems such as malfunctions, abnormal restarts, or performance degradation.

[0059] For example, combined Figure 7 and Figure 10 The grounding structure 9 includes a first grounding component 91 and a second grounding component 92. The first grounding component 91 is electrically connected to the filter circuit and the shielding cover 8. The second grounding component 92 is electrically connected to the shielding cover 8 and the enclosure 1. Using this grounding method, the filter circuit is first connected to the shielding cover 8 through the first grounding component 91. The electromagnetic shielding effect of the shielding cover 8 effectively blocks or absorbs high-frequency interference, while reducing the direct coupling of common-mode interference to the enclosure 1 and other sensitive circuit areas. Subsequently, the shielding cover 8 is connected to the grounded enclosure 1 through the second grounding component 92, forming a composite structure that integrates low-impedance shielding and controllable grounding discharge functions.

[0060] As an example of this application, please refer to Figure 4 , Figure 7 and Figure 10The first grounding component 91 includes a grounding post 911 and a fastener 912. A grounding portion 412 is provided on the plate 41, and one end of the grounding post 911 is electrically connected to the filter circuit through the grounding portion 412. The fastener 912 passes through the shielding cover 8 and fixes the shielding cover 8 and the other end of the grounding post 911. Thus, the above arrangement enables mechanical fixing and grounding connection between the filter circuit and the shielding cover 8. Furthermore, compared to direct wire welding, spring contact, or simple metal sheet pressing, the grounding post 911 and the grounding portion 412 are typically connected by threads or tight pressing, resulting in a large contact area and stable contact. The fastener 912 (such as a screw) mechanically and tightly connects the shielding cover 8 to the other end of the grounding post 911, ensuring good electrical conductivity. This allows the overall structure to form a low-impedance, stable electrical connection channel, effectively conducting common-mode current and high-frequency interference, ensuring reliable grounding between the filter board 4 and the shielding cover 8.

[0061] The grounding part 412 is used to realize the electrical connection between the filter circuit and the grounding post 911. For example, the grounding part 412 includes, but is not limited to, structures such as patch nuts, embedded nuts, press-fit nuts, weld nuts, and solder pads.

[0062] like Figure 7 and Figure 8 As shown, the shielding cover 8 has an opening 81 at one end with a mounting flange 84, and a mounting hole 841 is provided on the mounting flange 84. The second grounding component 92 is a grounding screw, which passes through the mounting hole 841 to fix and ground the mounting flange 84 and the side plate 11 of the housing 1.

[0063] Please refer to Figure 4 and Figure 10 In this embodiment, the plate 41 is provided with two conductive connection portions 411 and a grounding portion 412 disposed between the two conductive connection portions 411. The grounding portion 412 is electrically isolated from both conductive connection portions 411. The filter circuit is electrically connected to the grounding structure 9 through the grounding portion 412 and to the corresponding electrical connection component 3 through the conductive connection portions 411. By placing the grounding portion 412 between the two conductive connection portions 411, the grounding loop of the interference current can be shortened, enabling the filtering component 42 to be grounded nearby, optimizing the interference discharge path and filtering effect, reducing the risk of ground loops and common ground interference, thereby improving the electromagnetic compatibility and anti-interference capability of the overall structure. For example, the grounding portion 412 is located on the perpendicular bisector of the line connecting the two conductive connection portions 411. It is understood that the grounding portion 412 is electrically isolated from both conductive connection portions 411, meaning that the three are physically spaced apart.

[0064] like Figure 11As shown, in some embodiments, this application also provides a power system including a power converter 10 as described in any of the above technical solutions and a battery pack 20. The battery pack 20 has a positive port 201 and a negative port 202. The positive port 201 is electrically connected to a DC terminal 2 (positive DC terminal), and the negative port 202 is electrically connected to another DC terminal 2 (negative DC terminal). Since the power converter 10 in this embodiment has the same technical features as the power converter 10 described above, both can solve the same technical problems and achieve the same technical effects.

[0065] Among them, the positive port 201 is connected to the power processing module 7 (see label) through the positive DC terminal of the power converter 10. Figure 6 The negative port 202 is electrically connected to the power processing module 7 via the negative DC terminal in the power converter 10, thereby realizing the DC power transmission between the battery pack 20 and the power converter 10, and performing voltage conversion, power regulation, filtering control, and other processing on the DC power output from the battery pack 20 through the power converter 10. Specifically, each DC terminal 2 includes a pluggable wire connector 22 and a board connector 21. The wire connector 22 of the positive DC terminal is electrically connected to the positive port 201 of the battery pack 20 via an external cable 30, and the wire connector 22 of the negative DC terminal is electrically connected to the negative port 202 of the battery pack 20 via another external cable 30.

[0066] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.

Claims

1. A power converter, characterized in that, include: Box; The DC terminal block has two terminals spaced apart, one of which is a positive DC terminal block and the other is a negative DC terminal block. Each of the DC terminals passes through the housing and is partially located inside the housing. The electrical connection assembly has two sets arranged at intervals within the housing; The filter board includes a board body disposed within the housing and a filter circuit disposed within the board body; each of the DC terminals is electrically connected to the filter circuit through a corresponding electrical connection component.

2. The power converter according to claim 1, characterized in that, The electrical connection assembly includes a conductive post for supporting the plate on the DC terminal block, and the conductive post is electrically connected to the filter circuit.

3. The power converter according to claim 2, characterized in that, The electrical connection assembly further includes a plate end connector; in the same group of electrical connection assemblies, at least one of the plate end connector and the conductive post passes through the plate body, and the plate end connector and the conductive post are fixedly connected to fix the plate body on the DC terminal block.

4. The power converter according to claim 3, characterized in that, The conductive post has an internally threaded hole on its end face near the plate; the plate end connector includes a plate end screw, the screw portion of which passes through the plate and is threadedly connected to the internally threaded hole, so that the plate is clamped between the head of the plate end screw and the end face of the conductive post.

5. The power converter according to any one of claims 1 to 4, characterized in that, The power converter also includes: A temperature sensing element is disposed inside the housing and electrically connected to a temperature sensing circuit disposed on the plate. The temperature sensing element is used to detect the temperature of the DC terminal.

6. The power converter according to claim 5, characterized in that, Each of the electrical connection components includes a conductive post, and the temperature sensing element is disposed on the plate. The plate is electrically and thermally connected to the DC terminal through the corresponding conductive post.

7. The power converter according to claim 5, characterized in that, The temperature sensing element is disposed on the board, and the power converter further includes a heat-conducting structure, which thermally connects the DC terminal and the board.

8. The power converter according to claim 5, characterized in that, The temperature sensing element is disposed on the DC terminal and is in thermal contact with the DC terminal; the power converter also includes a conductive wire that electrically connects the temperature sensing element and the temperature sensing circuit.

9. The power converter according to claim 5, characterized in that, The temperature sensing element has at least two components, wherein at least one of the temperature sensing elements is used to detect the temperature of the positive DC terminal, and at least another temperature sensing element is used to detect the temperature of the negative DC terminal.

10. The power converter according to claim 1, characterized in that, The power converter also includes: A DC transmission cable has two terminals, one a positive DC transmission cable and the other a negative DC transmission cable. A power processing module, housed within the enclosure, includes a power conversion circuit and power devices; wherein, One end of each DC transmission cable is electrically connected to the corresponding DC terminal, and the other end is electrically connected to the power conversion circuit.

11. The power converter according to claim 10, characterized in that, Each of the DC terminals includes a pluggable board connector and a wire connector; the board connector passes through the enclosure and is partially located inside the enclosure, and is electrically connected to the power conversion circuit through the corresponding DC transmission cable; the wire connector is located outside the enclosure and is used for electrical connection to external cables.

12. The power converter according to claim 11, characterized in that, Each of the electrical connection components includes a conductive post, one end of which is electrically connected to the filter circuit, and the other end of which is threadedly connected to the conductive part of the board connector and the lug of the DC transmission cable.

13. The power converter according to any one of claims 10 to 12, characterized in that, The enclosure has a side plate for mounting the DC wiring terminals, and the power converter further includes: A shielding cover is connected to the housing. The shielding cover has an opening and a cable pass-through port. The opening is oriented toward the side plate to jointly enclose and form a shielding space. The cable pass-through port is used for the DC transmission cable to pass through. The portion of the DC terminal block located inside the housing, the electrical connection assembly, the filter plate, and the connection portion of the DC transmission cable to the DC terminal block are all disposed within the shielding space.

14. The power converter according to claim 13, characterized in that, The opening and the wire-passing port are respectively provided on the adjacent sidewalls of the shielding cover, and the opening and the wire-passing port are connected to each other.

15. The power converter according to claim 13, characterized in that, The power converter also includes: The grounding structure electrically connects the filter circuit and the enclosure, and the enclosure is grounded.

16. The power converter according to claim 15, characterized in that, The grounding structure includes: The first grounding component is electrically connected to the filter circuit and the shielding cover; The second grounding component is electrically connected to the shield and the enclosure.

17. The power converter according to claim 16, characterized in that, The first grounding component includes a grounding post and a fastener; a grounding part is provided on the plate, and one end of the grounding post is electrically connected to the filter circuit through the grounding part; The fastener passes through the shield and is fixedly connected to the other end of the shield and the grounding post.

18. The power converter according to claim 15, characterized in that, The plate has two conductive connection parts and a grounding part between the two conductive connection parts; the grounding part is electrically isolated from the two conductive connection parts; the filter circuit is electrically connected to the grounding structure through the grounding part, and is electrically connected to the corresponding electrical connection component through the conductive connection part.

19. An electric power system, characterized in that, include: The power converter as described in any one of claims 1 to 18; The battery pack has a positive terminal and a negative terminal, wherein the positive terminal is electrically connected to the positive DC terminal and the negative terminal is electrically connected to the negative DC terminal.

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