Power supply filtering module
By combining a common-mode filter inductor, a differential-mode filter inductor, and a triode discharge tube, the problem of poor filtering performance of the power supply filter module in an electromagnetic environment is solved, achieving efficient electromagnetic environment adaptation and protection functions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-04-03
AI Technical Summary
Existing power supply filtering modules have shortcomings in design complexity and electromagnetic environment handling, resulting in poor filtering performance. They are particularly susceptible to interference in electromagnetic environments and may cause interference to the outside world.
By employing a combination structure of common-mode filter inductor, differential-mode filter inductor, and triode discharge tube, and forming an LC filter circuit through the connection of capacitors and inductors, combined with the lightning protection function of the triode discharge tube, effective filtering and protection against the electromagnetic environment can be achieved.
It achieves efficient filtering in complex electromagnetic environments, meets national military standards, prevents external interference and prevents its own interference from propagating to the outside world, and protects circuit equipment from damage.
Smart Images
Figure CN224083419U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of electronic circuits, and more specifically, relates to a power supply filtering module. Background Technology
[0002] With societal development, electricity is increasingly integrated into people's daily lives, leading to ever-increasing demands on power supplies. In applications requiring high power quality, it is essential to prevent input signals from being interfered with by external factors, or to eliminate or suppress interference. This has resulted in the development of corresponding EMC electronic circuit modules, such as power filters.
[0003] A power supply filtering module not only needs to protect against or suppress external interference, but also needs to prevent its own generated interference from being input to the outside. The main components of this power supply filtering module are common-mode and differential-mode inductors and capacitors. These electronic components are used to complete some relatively complex tasks. In the circuit, we mainly use common-mode and differential-mode inductors, while the specifications of other electronic components such as capacitors and resistors can be adjusted according to the specific environment.
[0004] The circuit, composed of multiple inductors and capacitors, has the following main functions: First, it can correctly introduce the positive and negative terminals of the power supply to avoid unnecessary damage to the circuit when the positive and negative terminals of the power supply are reversed; second, it can effectively protect the input power supply from surges, and should especially have a good lightning protection function; finally, and most importantly, it can filter the input power supply through various connection methods of electronic components, that is, mainly to eliminate and suppress external and internal common-mode interference and differential-mode interference.
[0005] The main problems with existing power filtering modules are as follows:
[0006] (1) In actual circuits, the design of filter circuits becomes very complicated due to design requirements and the influence of parasitic parameters of various devices.
[0007] (2) When the electromagnetic environment is poor, the electromagnetic environment is significantly affected by external electromagnetic interference when filtering various electromagnetic environments. Utility Model Content
[0008] In view of this, in order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a power supply filtering module to achieve the purpose of good filtering of electromagnetic environment.
[0009] The technical solution adopted by this utility model is: a power supply filtering module, including an input terminal and an output terminal, and further comprising:
[0010] A common-mode filter inductor, wherein the input terminal is connected to the common-mode filter inductor via a first capacitor bank;
[0011] A differential-mode filter inductor, wherein the common-mode filter inductor is connected to the differential-mode filter inductor through a second capacitor bank, and the other end of the differential-mode filter inductor is connected to the output terminal through a third capacitor bank;
[0012] The differential-mode filter inductor has a triode discharge tube connected to its input terminal, and the other end of the triode discharge tube is grounded.
[0013] Furthermore, the first capacitor group includes capacitors C20, C19, C18, C17, and C1 connected in parallel across the input terminals of the common-mode filter inductor, and the first capacitor group formed therefrom is an energy storage filter capacitor.
[0014] Furthermore, the second capacitor group includes capacitors C3, C4, C5, and C6 connected in parallel across the output terminals of the common-mode filter inductor.
[0015] Furthermore, the third capacitor bank includes capacitors C9, C10, C11, and C12 connected in parallel across the output terminals of the differential-mode filter inductor.
[0016] Furthermore, the differential mode filter inductor includes a differential mode inductor L2 and a differential mode inductor L3. A capacitor C7 is connected in series between the input terminals of the differential mode inductor L2 and the differential mode inductor L3, and a capacitor C8 is connected in series between the output terminals of the differential mode inductor L2 and the differential mode inductor L3, so as to suppress differential mode high-frequency interference noise.
[0017] Furthermore, the first and second poles of the triode discharge tube are connected to the input terminals of differential mode inductors L2 and L3, respectively, and the third pole of the triode discharge tube is grounded to provide lightning protection.
[0018] Furthermore, the input and output terminals of the differential mode inductor L2 are connected to ground in series through capacitors C14 and C16, respectively, to serve as filters, decouplers, and stabilizers for the circuit.
[0019] Furthermore, the input and output terminals of the differential mode inductor L3 are connected to ground in series through capacitors C13 and C15, respectively, to serve as filters, decouplers, and stabilizers for the circuit.
[0020] The beneficial effects of this utility model are as follows:
[0021] 1. The power filtering module provided by this utility model is composed of a common-mode filter inductor, a capacitor, a differential-mode filter inductor, an anti-static tube, etc., forming an LC combined filter module. It can meet the various electromagnetic application environments specified by national military standards. When this filter circuit is used, it is not affected by the external electromagnetic environment, and at the same time, it does not interfere with the effect of the external electromagnetic environment.
[0022] 2. The power filtering module provided by this utility model has a triode discharge tube connected between the common-mode filter inductor and the differential-mode filter inductor. This triode discharges instantaneous overcurrent from lightning and limits overvoltage, thereby protecting electronic equipment connected in parallel with the discharge tube from overvoltage damage. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall circuit structure of the power filtering module provided by this utility model. Detailed Implementation
[0024] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.
[0025] Example 1
[0026] like Figure 1 As shown, this embodiment specifically provides a power supply filtering module, which aims to filter the power supply...
[0027] The source filtering module is designed to effectively filter power supplies in electromagnetic environments and achieve good filtering results. It includes input and output terminals. The input terminal includes a positive input terminal Vin+ and a negative input terminal Vin-; the output terminal includes a positive output terminal Vout+ and a positive output terminal Vout-. The module also includes a common-mode filter inductor, a differential-mode filter inductor, and a triode discharge transistor. The specific design is as follows:
[0028] ① Common-mode filter inductor
[0029] The common-mode filter inductor is L1. The input terminals of L1 are connected to the power input terminals (positive input Vin+ and negative input Vin-) through a first capacitor bank. The first capacitor bank includes capacitors C20, C19, C18, C17, and C1 connected in parallel across the input terminals of the common-mode filter inductor. The specific parameters of each capacitor are selected based on the actual circuit requirements and are not limited here. In this module, the common-mode inductor serves as an EMI filter, suppressing the outward radiation of electromagnetic waves generated by high-speed signal lines.
[0030] ② Differential-mode filter inductor
[0031] The differential mode filter inductor includes differential mode inductor L2 and differential mode inductor L3. A capacitor C7 is connected in series between the input terminals of differential mode inductors L2 and L3, and a capacitor C8 is connected in series between the output terminals of differential mode inductors L2 and L3. In this differential mode filter inductor design, differential mode inductors L2 and L3, along with capacitors C7 and C8, form a circuit. Because differential mode inductors L2 and L3 have high inductive reactance to differential mode high-frequency interference, while capacitor C8 has low capacitive reactance to high-frequency interference, differential mode interference noise is filtered out and not added to subsequent circuits, thereby achieving the purpose of suppressing differential mode high-frequency interference noise.
[0032] The output terminal of the common-mode filter inductor and the input terminal of the differential-mode filter inductor are connected through a second capacitor bank. In this embodiment, the second capacitor bank includes capacitors C3, C4, C5 and C6 connected in parallel across the output terminal of the common-mode filter inductor. The specific parameters of each capacitor are selected according to the actual circuit requirements and are not limited here.
[0033] The other output terminal of the differential-mode filter inductor is connected to the output terminal of the power supply via a third capacitor bank. In this embodiment, the third capacitor bank includes capacitors C9, C10, C11, and C12 connected in parallel across the output terminals of the differential-mode filter inductor. The specific parameters of each capacitor are selected according to the actual circuit requirements and are not limited here. The output terminals of the third capacitor bank are the positive output terminal Vout+ and the positive output terminal Vout-, respectively.
[0034] ③ Protection circuit section
[0035] A triode discharge tube is connected to the input terminal of the differential mode filter inductor, with the other end of the triode discharge tube grounded. The first and second terminals of the triode discharge tube are connected to the input terminals of differential mode inductors L2 and L3, respectively, and the third terminal is grounded. The triode discharge tube is a gas discharge tube, also known as a ceramic discharge tube, and is a gap-type lightning protection element. The input and output terminals of differential mode inductor L2 are grounded via capacitors C14 and C16, respectively; the input and output terminals of differential mode inductor L3 are grounded via capacitors C13 and C15, respectively.
[0036] Based on the above, in this power supply filtering module, the input terminal consists of a first capacitor bank forming an energy storage and filtering capacitor. Then, a common-mode filtering inductor is connected in series for common-mode filtering. A triode discharge tube is connected to ground to achieve electrostatic protection and lightning protection. Then, a differential-mode inductor is connected in series with each of the positive and negative terminals of the power supply to form a differential-mode filtering inductor for differential-mode filtering. A third capacitor bank is then connected in parallel to form an LC filter circuit with the differential-mode inductor, thereby achieving the functions of energy storage and instantaneous power outage protection.
[0037] The power filtering module in this embodiment can filter various electromagnetic environments according to the actual electromagnetic environment application conditions, so that the product can more effectively meet the relevant electromagnetic application environment requirements specified by the "National Military Standard" and has high filtering efficiency.
[0038] It should be noted that any process or method description in the flowchart or otherwise herein can be understood as representing a sequence of steps comprising one or more steps for implementing a specific logical function or process.
[0039] The code module, fragment, or portion that executes the instructions, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which the embodiments of this application pertain.
[0040] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0041] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.
[0042] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0043] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.
[0044] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A power filter module comprising an input and an output, characterized by, Also comprising: a common mode filter inductor, the input end being connected to the common mode filter inductor through a first capacitor group; a differential mode filter inductor, the common mode filter inductor being connected to the differential mode filter inductor through a second capacitor group, the other end of the differential mode filter inductor being connected to the output end through a third capacitor group; wherein the input end of the differential mode filter inductor is connected to a three-electrode discharge tube, the other end of the three-electrode discharge tube being grounded.
2. The power filter module of claim 1, wherein, The first capacitor group comprises capacitors C20, C19, C18, C17 and C1 connected in parallel across the input end of the common mode filter inductor.
3. The power filter module of claim 1, wherein, The second capacitor group comprises capacitors C3, C4, C5 and C6 connected in parallel across the output end of the common mode filter inductor.
4. The power filter module of claim 1, wherein, The third capacitor group comprises capacitors C9, C10, C11 and C12 connected in parallel across the output end of the differential mode filter inductor.
5. The power filter module of claim 1, wherein, The differential mode filter inductor comprises differential mode inductors L2 and L3, the input end of the differential mode inductor L2 and the input end of the differential mode inductor L3 being connected in series with a capacitor C7, the output end of the differential mode inductor L2 and the output end of the differential mode inductor L3 being connected in series with a capacitor C8.
6. The power filter module of claim 5, wherein, The first electrode and the second electrode of the three-electrode discharge tube are respectively connected to the input end of the differential mode inductor L2 and the input end of the differential mode inductor L3, and the third electrode of the three-electrode discharge tube is grounded.
7. The power filter module of claim 5, wherein, The input end and the output end of the differential mode inductor L2 are connected in series to ground through capacitors C14 and C16 respectively. The input end and the output end of the differential mode inductor L3 are connected in series to ground through capacitors C13 and C15 respectively.
8. The power filter module of claim 5, wherein,