A DC filter with control protection

Abstract

This utility model relates to the field of filter technology and discloses a DC filter with control protection, including a mounting base plate. A bottom heat sink is disposed in the middle of the surface of the mounting base plate, and a DSP&FPGA dual-core controller is disposed in the middle of the upper surface of the bottom heat sink. A capacitor bank is disposed on one side of the DSP&FPGA dual-core controller. By integrating the DSP&FPGA dual-core controller and the rectangular adjustable resistor array, dynamic parameter adjustment function is realized. The DSP&FPGA dual-core controller collects load fluctuation signals in real time and accurately controls the resistance value of the rectangular adjustable resistor array with the built-in PID algorithm, adaptively matching a wide range of load changes, effectively suppressing resonance detuning and improving high-frequency attenuation capability. At the same time, the capacitor bank and the bottom heat sink work together. By optimizing LC network parameters and enhancing heat dissipation efficiency, and with the built-in surge current detection mechanism, protection action can be triggered within 10μs, reducing the device overload damage rate to below 3%.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and more specifically, to a DC filter with control protection. Background Technology

[0002] A DC filter is a key power electronic device used to suppress harmonics, electromagnetic interference, and transient noise in a DC power supply system. Its core function is to filter out high-frequency interference signals introduced by switching device operation, load changes, or external environment on the DC bus through a specific circuit topology, ensuring that downstream equipment receives stable and clean DC power. A typical structure consists of passive components such as inductors, capacitors, and resistors. For example, an LC filter network utilizes the characteristics of inductors resisting high frequencies and capacitors passing AC to form a low-impedance path for attenuating harmonics in a specific frequency band. It is widely used in high-voltage DC transmission, new energy power generation (photovoltaic / energy storage converters), electric vehicle charging piles, and industrial frequency conversion equipment. It can effectively reduce electromagnetic radiation, prevent malfunctions of precision electronic components, and improve the overall energy efficiency of the system.

[0003] A protected power filter, such as the one disclosed in publication (announcement) number CN218456387U, includes a filter, a heat dissipation device, a surge protection device, a data processing device, a voltage conversion module, a power interface module one, a power interface module two, a voltage regulator module, a temperature detection device, a current detection device, and an environmental parameter detection device. The power interface module one, surge protection device, filter, voltage regulator module, current detection device, and power interface module two are connected sequentially. The voltage conversion module is connected to the voltage regulator module. The voltage conversion module, heat dissipation device, temperature detection device, current detection device, and environmental parameter detection device are each connected to the data processing device. This invention enables active heat dissipation of the filter and, simultaneously, the detection of environmental parameters for filter operation, helping technicians determine the suitable environment for filter use.

[0004] However, based on the working principle proposed in the aforementioned patent, the applicant believes that although the device can actively dissipate heat from the filter to a certain extent, in actual use, traditional LC / RC filters adopt a fixed parameter design and cannot adjust the filtering characteristics in real time according to load fluctuations. When the load changes over a wide range, problems such as resonance detuning and insufficient high-frequency attenuation are likely to occur. In addition, the lack of dynamic protection against surge current and short-circuit faults can easily lead to a high overload damage rate of the device. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a DC filter with control protection, which has the advantages of adaptive filtering, rapid fault isolation, and modular maintenance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a DC filter with control protection, including a mounting base plate, a bottom heat sink plate is provided at the middle position of the surface of the mounting base plate, a DSP&FPGA dual-core controller is provided at the middle part of the upper surface of the bottom heat sink plate, a capacitor bank is provided on one side of the DSP&FPGA dual-core controller, and a rectangular adjustable resistor array is provided on the other side of the DSP&FPGA dual-core controller.

[0007] As a preferred embodiment of this utility model, side modular interface plates are fixedly installed on both sides of the mounting base plate, and the surface of the side modular interface plates is provided with connection ports.

[0008] As a preferred embodiment of this utility model, an installation groove is provided on the inner side of the connection port, and a spring-loaded spherical clamping block is fixedly installed on the inner side of the installation groove.

[0009] As a preferred embodiment of this utility model, a connecting rod is provided on the inner side of the capacitor group, and a Hall sensor is fixedly installed on the surface of the connecting rod.

[0010] As a preferred embodiment of this utility model, a cover is movably mounted on the top of the mounting base plate, and transmission lines are fixedly mounted on both sides of the cover.

[0011] As a preferred embodiment of this utility model, side wing plates are fixedly installed on both the front and rear sides of the mounting base plate, and fixing holes are provided on the surface of the side wing plates.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model integrates a DSP & FPGA dual-core controller with a rectangular adjustable resistor array to achieve dynamic parameter adjustment. The DSP & FPGA dual-core controller collects load fluctuation signals in real time and combines the built-in PID algorithm to accurately control the resistance value of the rectangular adjustable resistor array, adaptively matching a wide range of load changes, effectively suppressing resonance detuning and improving high-frequency attenuation capability. At the same time, the capacitor bank and the bottom heat sink work together to optimize LC network parameters and enhance heat dissipation efficiency. With the built-in surge current detection mechanism, protection action can be triggered within 10μs, reducing the device overload damage rate to below 3%.

[0014] 2. This utility model adopts a spring-clamped spherical block design for the side-mounted modular interface board and connection port, which supports tool-free insertion and removal of 10mm² cables, improving installation efficiency and reducing contact resistance; the Hall sensor is fixed to the inside of the capacitor bank by a connecting rod, directly monitoring the bus current change rate and ensuring fault response accuracy of ±0.5%; the cover and transmission line form a fully enclosed electromagnetic shielding structure, which, together with the fixing holes of the side wing plate, achieves an IP54 protection level, ensuring filtering stability and equipment lifespan even under complex working conditions. Attached Figure Description

[0015] Fig. 1 This is a frontal perspective three-dimensional schematic diagram of the overall structure of this utility model;

[0016] Fig. 2 This is a rear-view perspective view of the overall structure of this utility model;

[0017] Fig. 3 This is a three-dimensional schematic diagram of the interior of the present invention after the cover structure has been removed;

[0018] Fig. 4 This is an enlarged three-dimensional schematic diagram of a part of the structure of this utility model.

[0019] In the diagram: 1. Mounting base plate; 2. Bottom heat sink; 3. DSP & FPGA dual-core controller; 4. Capacitor bank; 5. Rectangular adjustable resistor array; 6. Side modular interface board; 7. Connection port; 8. Mounting slot; 9. Spring-clamped ball block; 10. Connecting rod; 11. Hall sensor; 12. Cover; 13. Transmission line; 14. Side wing plate; 15. Fixing hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figs. 1 to 4 As shown, this utility model provides a DC filter with control protection, including a mounting base plate 1, a bottom heat sink 2 is provided at the middle position of the surface of the mounting base plate 1, a DSP&FPGA dual-core controller 3 is provided at the middle part of the upper surface of the bottom heat sink 2, a capacitor bank 4 is provided on one side of the DSP&FPGA dual-core controller 3, and a rectangular adjustable resistor array 5 is provided on the other side of the DSP&FPGA dual-core controller 3.

[0022] The mounting base plate 1 has side modular interface plates 6 fixedly installed on both sides of its surface, and the side modular interface plates 6 have connection ports 7 on their surfaces.

[0023] The side-mounted modular interface board 6 features a rail-type structure that supports hot-swappable expansion modules and simplifies maintenance. The standardized openings of the connection port 7 allow for quick access to cables of different diameters and reduce contact resistance.

[0024] The connection port 7 has an inner groove 8, and a spring-loaded ball-shaped clip 9 is fixedly installed inside the groove 8.

[0025] The stepped slot of the mounting slot 8 can fix the spring-clipped spherical block 9 and ensure the mechanical stability of the insertion and removal action; the elastic pre-tightening setting of the spring-clipped spherical block 9 can adapt to changes in cable diameter and maintain a constant clamping force.

[0026] Among them, a connecting rod 10 is provided on the inner side of the capacitor group 4, and a Hall sensor 11 is fixedly installed on the surface of the connecting rod 10.

[0027] By using the cantilever extension of the linkage 10, the Hall sensor 11 can be precisely positioned to the center of the busbar to improve the accuracy of current detection; by using the embedded layout of the Hall sensor 11, the current change rate can be monitored in real time and trigger μs-level protection actions.

[0028] The top of the mounting base plate 1 is movably mounted with a cover 12, and transmission lines 13 are fixedly mounted on both sides of the cover 12.

[0029] The electromagnetic shielding cavity of the housing 12 can isolate external interference and meet the IP54 protection level requirements; the silver-plated conductor of the transmission line 13 can reduce signal transmission loss and enhance high-frequency noise immunity.

[0030] The mounting base plate 1 has side wing plates 14 fixedly installed on both the front and rear sides, and the surface of the side wing plates 14 has fixing holes 15.

[0031] The thickened ribs on the side wing plate 14 can disperse mechanical stress and improve the vibration and impact resistance of the equipment; the countersunk thread structure of the fixing hole 15 can hide the fasteners and prevent scratches on the mounting surface.

[0032] The working principle and usage process of this utility model are as follows: When using this device, the mounting base plate 1 manages the heat of the core components through the bottom heat sink 2. The DSP & FPGA dual-core controller 3 receives the bus current signal transmitted by the Hall sensor 11 through the connecting rod 10 in real time. It dynamically adjusts the resistance range of the rectangular adjustable resistor array 5 through spectrum analysis, and forms an adaptive LC filter network with the capacitor bank 4 to suppress broadband harmonics. When a surge or short circuit is detected, the controller 3 triggers the connection port 7 to quickly cut off the power through the spring-clamped ball block 9 of the side modular interface board 6. At the same time, the bottom heat sink 2, together with the transmission line 13 of the cover 12, enhances the electromagnetic shielding effect. The fixing holes 15 of the side wing plate 14 provide mechanical fixing points to ensure that the entire system maintains structural stability during dynamic filtering and multiple protection processes.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DC filter with control and protection, comprising a mounting base plate (1), characterized in that: A bottom heat sink (2) is provided at the middle position of the surface of the mounting base plate (1). A DSP&FPGA dual-core controller (3) is provided at the middle part of the upper surface of the bottom heat sink (2). A capacitor bank (4) is provided on one side of the DSP&FPGA dual-core controller (3). A rectangular adjustable resistor array (5) is provided on the other side of the DSP&FPGA dual-core controller (3).

2. A DC filter with control and protection according to claim 1, characterized in that: Both sides of the mounting base plate (1) are fixedly installed with side modular interface plates (6), and the surface of the side modular interface plates (6) is provided with connection ports (7).

3. A DC filter with control and protection according to claim 2, characterized in that: An installation groove (8) is provided on the inner side of the connection port (7), and a spring-clamped spherical block (9) is fixedly installed on the inner side of the installation groove (8).

4. A DC filter with control protection according to claim 1, characterized in that: A connecting rod (10) is provided on the inner side of the capacitor group (4), and a Hall sensor (11) is fixedly installed on the surface of the connecting rod (10).

5. A DC filter with control and protection according to claim 1, characterized in that: A cover (12) is movably installed on the top of the mounting base plate (1), and transmission lines (13) are fixedly installed on both sides of the cover (12).

6. A DC filter with control protection according to claim 1, characterized in that: Side wing plates (14) are fixedly installed on both the front and rear sides of the mounting base plate (1), and fixing holes (15) are opened on the surface of the side wing plates (14).

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