CN110429604A - A kind of multistage strong electromagnetic pulse protection power-supply filter - Google Patents

A kind of multistage strong electromagnetic pulse protection power-supply filter Download PDF

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Publication number
CN110429604A
CN110429604A CN201910810608.3A CN201910810608A CN110429604A CN 110429604 A CN110429604 A CN 110429604A CN 201910810608 A CN201910810608 A CN 201910810608A CN 110429604 A CN110429604 A CN 110429604A
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China
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varistor
filter
transient voltage
common mode
pipe
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CN201910810608.3A
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CN110429604B (en
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宋政湘
秦川
王建华
张国钢
翟小社
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Xian Jiaotong University
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Xian Jiaotong University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)

Abstract

The present invention relates to a kind of multistage strong electromagnetic pulses to protect power-supply filter, filtering is internal to be divided into four parts by partition, including eight modules, first order clipping module, buffer network, second level clipping module, low frequency filtering module, third level clipping module, intermediate frequency filtering module, fourth stage clipping module and High frequency filter module inhibit the devices such as pipe, inductance, capacitor to construct multi-stage filter circuit network using varistor, transient voltage.Module between adjacent part cooperatively forms cascade by the through-hole on feedthrough capacitor and partition, realizes the good ground connection of each section and electromagnetic shielding.The present invention takes full advantage of the structure space of filter internal, realizes and targetedly filters step by step, clear thinking, structural integrity.Feedthrough capacitor and high-frequency ceramic capacitor is utilized in capacitance component simultaneously, obtains excellent high frequency characteristics while reducing filter volume, realizes modularization, miniaturization and the Performance optimization of filter.

Description

A kind of multistage strong electromagnetic pulse protection power-supply filter
Technical field
The present invention relates to filter fields, and in particular to a kind of multistage strong electromagnetic pulse protection power-supply filter.
Background technique
With the rapid development of power electronic technique, electromagnetic environment is increasingly complicated, and the equipment based on electronic circuit is held Interference vulnerable to electromagnetic pulse leads to equipment fault.Power supply is the important composition portion of equipment as the input terminal of plant capacity Point, under strong electromagnetic pulse interference, power-supply system is stood in the breach.Therefore the power-supply filter protected for strong electromagnetic pulse Trouble free service important in inhibiting of the design and development to equipment.
Power-supply filter generally will be installed in power input port, main there are two purposes, one is inhibiting through power supply Line enters the electromagnetic interference of sensitive equipment or system;The second is inhibiting the conducted emission of equipment or system itself.With filtering skill The development of art, filter how in a limited space in neatly translation circuit structural parameters obtain excellent ultratvide frequency band (especially high band) filter effect is the hot and difficult issue studied at present.Present filter is many kinds of, but clipping ability Weak, poor high frequency characteristics is always insoluble problem, and the highest effective frequency filtering of common power-supply filter can only achieve The filter effect of 30MHz, the filtering magnetic flux of signal cable are extremely limited, it is difficult to meet the relevant criterion of electromagnetic compatibility.
Summary of the invention
The purpose of the present invention is to provide a kind of multistage strong electromagnetic pulses to protect power-supply filter, to overcome in the prior art It is existing how in a limited space in neatly translation circuit structural parameters obtain excellent ultratvide frequency band (especially high frequency Section) filter effect the technical issues of.
In order to achieve the above object, the present invention adopts the following technical scheme:
It is a kind of multistage strong electromagnetic pulse protect power-supply filter, including shell, first part, second part, Part III, Part IV and filter internal partition;Multistage strong electromagnetic pulse protects power-supply filter from input terminal to output end, first part, Second part, Part III and Part IV are sequentially connected, and first part includes the first order clipping module being sequentially connected, buffering Network and second level clipping module, second part include the low frequency filtering module being sequentially connected and third level clipping module, third Part includes the intermediate frequency filtering module being sequentially connected and fourth stage clipping module, and Part IV includes High frequency filter module;
Between first part and second part, between second part and Part III and Part III and Part IV it Between be respectively equipped with filter internal partition.
In first part, first order clipping module and second level clipping module use the varistor of different model, and first The voltage class for the varistor that grade clipping module uses is higher than the voltage class for the varistor that second level clipping module uses.
First order clipping module includes varistor MOV1, varistor MOV2 and varistor MOV3, varistor MOV1, varistor MOV2 and varistor MOV3 join end to end and form access with cage connection;
Second level clipping module includes varistor MOV4, varistor MOV5 and varistor MOV6, varistor MOV4, varistor MOV5 and varistor MOV6 join end to end and form access with cage connection;
Two pins of varistor MOV2 are separately connected with input line L and input line N respectively, and the two of varistor MOV2 Pin is also connect with two line conductors of buffer network input terminal respectively;
Two pins of varistor MOV5 are connect with two line conductors of buffer network output end respectively.
In second part, low frequency filtering module includes feedthrough capacitor C1, feedthrough capacitor C2, common mode inductance L2, common mode capacitance C3, common mode capacitance C4, differential mode inductance L3, differential mode inductance L4 and differential mode capacitor C5;Common mode inductance L2 input terminal and second level clipping Module is connected by feedthrough capacitor C1 with feedthrough capacitor C2;Feedthrough capacitor C1 and feedthrough capacitor C2 passes through on filter internal partition Hole is contacted with shell;Two line conductors of common mode inductance L2 output end respectively with one end of differential mode inductance L3 and differential mode inductance L4 one End series connection, common mode inductance L2 and the concatenated position differential mode inductance L3 and with the concatenated position differential mode inductance L4 respectively with shell it Between connect common mode capacitance C3 and common mode capacitance C4, the other end of the other end of differential mode inductance L3 and differential mode inductance L4 respectively with differential mode Two pins of capacitor C5 connect.
In second part, third level clipping module include transient voltage inhibit pipe TVS1, transient voltage inhibit pipe TVS2 and Transient voltage inhibits pipe TVS3, and transient voltage inhibits pipe TVS1, transient voltage that pipe TVS2 and transient voltage is inhibited to inhibit pipe TVS3 It joins end to end and forms access with cage connection, transient voltage inhibits pipe TVS2 to connect to be formed with the output end of low frequency filtering module Access.
In Part III, intermediate frequency filtering module includes feedthrough capacitor C6, feedthrough capacitor C7, common mode inductance L5 and common mode inductance L6, two line conductors and third level clipping module of the input terminal of common mode inductance L5 are connected by feedthrough capacitor C6 and feedthrough capacitor C7 It connects;Feedthrough capacitor C6 and feedthrough capacitor C7 are contacted by the hole on filter internal partition with shell;The output end of common mode inductance L5 It is connect with the input terminal of common mode inductance L6.
The inductance value of common mode inductance L5 is higher than the inductance value of common mode inductance L6.
In Part III, fourth stage clipping module include transient voltage inhibit pipe TVS4, transient voltage inhibit pipe TVS5 and Transient voltage inhibits pipe TVS6, and transient voltage inhibits pipe TVS4, transient voltage that pipe TVS5 and transient voltage is inhibited to inhibit pipe TVS6 It joins end to end and forms access with cage connection, transient voltage inhibits pipe TVS5 to connect with the output end of intermediate frequency filtering module.
In Part IV, High frequency filter module includes feedthrough capacitor C8, feedthrough capacitor C9 and common mode inductance L7, common mode inductance Two line conductors and state voltage of L7 input terminal inhibit two pins of pipe TVS5 to pass through feedthrough capacitor C8 and feedthrough capacitor C9 respectively Connection;Feedthrough capacitor C8 and feedthrough capacitor C9 are contacted by the hole on filter internal partition with shell;Common mode inductance L7 output end Two line conductors be separately connected respectively with output line L and output line N.
Input line L, the input line N of multistage strong electromagnetic pulse protection power-supply filter, output line L and output line N pass through rubber Cushion rubber is connected with the through-hole cooperation on shell, and input line L, input line N, output line L and the corresponding aperture of output line N are perpendicular to outer Shell.
The invention has the following beneficial technical effects:
Between the first part and second part of multistage strong electromagnetic pulse protection power-supply filter of the invention, second part It is respectively equipped with filter internal partition between Part III and between Part III and Part IV, has reached good electromagnetic screen It is interior in a limited space to realize the ultrabroad band high-performance filtering being targetedly classified while covering.The present invention is first To improve through-current capacity in the protection of part strong electromagnetic pulse, clipping module uses first order clipping module and second level clipping module Mode in parallel, for guarantee first order clipping module and second level clipping module is orderly cut-off and through-current capacity matches with through-current capability It closes, inductance buffer network is added between first order clipping module and second level clipping module, equivalent long transmission line delays pulse to reach The rear class time creates conditions for the successful inhibition of prime clipping device, while ensure that maximum through-current capacity.The present invention can be directed to Different frequency range separately designs multistage strong electromagnetic pulse protection power-supply filter, forms region filtering, inhibits step by step, shields between section Filter construction, realize ultrabroad band high Insertion Loss filtering.
Detailed description of the invention
Fig. 1 is the overall appearance structural representation that the multistage strong electromagnetic pulse of the present invention protects power-supply filter;
Fig. 2 is the integral layout structural schematic diagram that the multistage strong electromagnetic pulse of the present invention protects power-supply filter;
Fig. 3 is the integrated circuit structural representation that the multistage strong electromagnetic pulse of the present invention protects circuit connection in power-supply filter Figure;
Fig. 4 is the circuit diagram that the multistage strong electromagnetic pulse of the present invention protects first part in power-supply filter;
Fig. 5 is the circuit diagram that the multistage strong electromagnetic pulse of the present invention protects second part in power-supply filter;
Fig. 6 is the circuit diagram that the multistage strong electromagnetic pulse of the present invention protects Part III in power-supply filter;
Fig. 7 is the circuit diagram that the multistage strong electromagnetic pulse of the present invention protects Part IV in power-supply filter;
Wherein: 1- shell, 2- first filter internal partition, 3- second filter internal partition, 4- third filter internal partition, The hole 5-, 6- buffer network.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawing so that advantages and features of the invention can be easier to by It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.
Referring to Fig. 2, multistage strong electromagnetic pulse of the invention protects power-supply filter, including shell 1, first part, second Partially, Part III, Part IV and filter internal partition;Multistage strong electromagnetic pulse protects power-supply filter from input terminal to defeated Outlet, first part, second part, Part III and Part IV are sequentially connected, and first part includes first be sequentially connected Grade clipping module, buffer network and second level clipping module, second part include the low frequency filtering module and third being sequentially connected Grade clipping module, Part III include the intermediate frequency filtering module being sequentially connected and fourth stage clipping module, and Part IV includes height Frequency filter module;Between first part and second part, between second part and Part III and Part III and the 4th / it is respectively equipped with filter internal partition.
Referring to Fig. 3 and Fig. 4, this hair is invented in first part, and first order clipping module and second level clipping module be not using With the varistor of model, the voltage class of the varistor of first order clipping module use is used higher than second level clipping module Varistor voltage class.First order clipping module includes varistor MOV1, varistor MOV2 and varistor MOV3, varistor MOV1, varistor MOV2 and varistor MOV3 join end to end and form access with cage connection;Second Grade clipping module includes varistor MOV4, varistor MOV5 and varistor MOV6, varistor MOV4, varistor MOV5 and varistor MOV6 joins end to end and forms access with cage connection;Two pins of varistor MOV2 respectively with it is defeated Enter line L and input line N is separately connected, two-way of two pins of varistor MOV2 also respectively with 6 input terminal of buffer network is led Line connection;Two pins of varistor MOV5 are connect with two line conductors of 6 output end of buffer network respectively.
Referring to Fig. 3 and Fig. 5, in second part of the present invention, low frequency filtering module include feedthrough capacitor C1, feedthrough capacitor C2, Common mode inductance L2, common mode capacitance C3, common mode capacitance C4, differential mode inductance L3, differential mode inductance L4 and differential mode capacitor C5;Common mode inductance L2 Two line conductors of input terminal pass through feedthrough capacitor C1 with two pins of varistor MOV5 respectively and connect with feedthrough capacitor C2;It wears Electrocardio holds C1 and feedthrough capacitor C2 and is contacted by the hole on filter internal partition with shell;The two-way of common mode inductance L2 output end is led Line is connected with one end of one end of differential mode inductance L3 and differential mode inductance L4 respectively, common mode inductance L2 and the concatenated portion differential mode inductance L3 Position and with the concatenated position differential mode inductance L4 respectively between shell connect common mode capacitance C3 and common mode capacitance C4, differential mode inductance The other end of L3 and the other end of differential mode inductance L4 are connect with two pins of differential mode capacitor C5 respectively;Third level clipping module packet Inhibit pipe TVS1, transient voltage that pipe TVS2 and transient voltage is inhibited to inhibit pipe TVS3 containing transient voltage, transient voltage inhibits pipe TVS1, transient voltage inhibit pipe TVS2 and transient voltage to inhibit pipe TVS3 to join end to end and form access, transient state with cage connection Voltage inhibits two pins of pipe TVS2 to connect to form access with two pins of differential mode capacitor C5 respectively.
Referring to Fig. 3 and Fig. 6, in Part III, intermediate frequency filtering module includes feedthrough capacitor C6, feedthrough capacitor C7, common mode electricity Feel L5 and common mode inductance L6, two line conductors and transient voltage of the input terminal of common mode inductance L5 inhibit two pins point of pipe TVS2 Not Tong Guo feedthrough capacitor C6 connected with feedthrough capacitor C7;Feedthrough capacitor C6 and feedthrough capacitor C7 passes through the hole on filter internal partition It is contacted with shell;The output end of common mode inductance L5 is connect with the input terminal of common mode inductance L6;Fourth stage clipping module includes transient state Voltage inhibits pipe TVS4, transient voltage that pipe TVS5 and transient voltage is inhibited to inhibit pipe TVS6, and transient voltage inhibits pipe TVS4, transient state Voltage inhibits pipe TVS5 and transient voltage to inhibit pipe TVS6 to join end to end and form access with cage connection, and transient voltage inhibits pipe Two pins of TVS5 are connect with two line conductors of common mode inductance L6 output end respectively.The inductance value of common mode inductance L5 is higher than common mode The inductance value of inductance L6.
Referring to Fig. 3 and Fig. 7, in Part IV, High frequency filter module includes feedthrough capacitor C8, feedthrough capacitor C9 and common mode electricity Feel L7, two line conductors and state voltage of common mode inductance L7 input terminal inhibit two pins of pipe TVS5 to pass through feedthrough capacitor C8 respectively It is connected with feedthrough capacitor C9;Feedthrough capacitor C8 and feedthrough capacitor C9 are contacted by the hole on filter internal partition with shell;Common mode Two line conductors of inductance L7 output end are separately connected with output line L and output line N respectively.
In four parts of this clearly demarcated multistage strong electromagnetic pulse protection power-supply filter, two neighboring part is by filter Partition separates, and is correspondingly connected with the module of partition two sides by feedthrough capacitor, forms good ground connection and electromagnetic shielding.
When first part connects, first by the input line L of filter and input line N two with varistor MOV2 respectively Pin is connected, and secondly varistor MOV1, varistor MOV2 and varistor MOV3 join end to end and connect with two sides shell It connects to form access, two pins of varistor MOV2 is connect with two line conductors of 6 input terminal of buffer network;Varistor MOV4, varistor MOV5 and varistor MOV6 join end to end and form access with two sides cage connection, by varistor Two pins of MOV5 are connect with two line conductors of 6 output end of buffer network, form access.Two-stage clipping module uses pressure-sensitive Resistance model is different, and it is in order to rapidly by strong electromagnetic pulse that first order clipping module, which uses the higher varistor of voltage class, It is reduced to a small pulse, it, will be small by the second level lower varistor of clipping module voltage class after buffer network 6 Pulse continues to cut down, and by the different varistor of front and back stages voltage class, can effectively inhibit strong electromagnetic pulse.Buffer subsystem Network is using filtering common mode inductance L1.
When second part connects, feedthrough capacitor C1, feedthrough capacitor C2 are by the hole 5 on first filter internal partition 2 and outside Shell 1 forms good contact, feedthrough capacitor C1, the both ends feedthrough capacitor C2 pin respectively with the varistor MOV5 in first part It connects to form access with common mode inductance L2, the two-way of common mode inductance L2 output end is connected differential mode inductance L3 and differential mode inductance respectively L4, the local two-route wire of concatenation connect a common mode capacitance C3 and common mode capacitance C4 between shell respectively, later differential mode inductance The two-route wire of the idle one end L3 and differential mode inductance L4 connects two pins of differential mode capacitor C5 respectively.In third level clipping module, By transient voltage inhibit pipe TVS1, transient voltage inhibit pipe TVS2 and transient voltage inhibit pipe TVS3 join end to end and with outside two sides Shell connects to form access, secondly inhibits two pins of pipe TVS2 to connect respectively with two pins of differential mode capacitor C5 transient voltage It connects to form access.Wherein for common mode capacitance C3 and common mode capacitance C4 using high-frequency ceramic capacitor, the high frequency for improving capacitor is special Property, capacitor two sides are silver-plated, form capacitor the two poles of the earth, and pole plate layer will be slightly shorter than outside pole plate layer on the inside of capacitance component, at least short 2mm, In order to which internal electric insulate when block coupled in series, reach resistance to pressure request.
In Part III, the inductance value of common mode inductance L5 is higher than the inductance value of common mode inductance L6, what formation filtered step by step Structure, feedthrough capacitor C6 and feedthrough capacitor C7 are formed with shell 1 by the hole 5 on second filter internal partition 3 and are well contacted, and are worn Electrocardio holds C6 and the pin at the both ends feedthrough capacitor C7 inhibits pipe TVS2 and common mode inductance with the transient voltage in second part respectively L5 connects to form access, and common mode inductance L5 and common mode inductance L6 are connected in series.Transient voltage in third level clipping module inhibits Pipe TVS4, transient voltage inhibit pipe TVS5 and transient voltage that pipe TVS6 is inhibited to join end to end and formed with two sides cage connection logical Secondly transient voltage is inhibited two pins of pipe TVS5 to connect with the two-route wire of the idle one end common mode inductance L6 respectively to be formed by road Access.
The devices such as pipe, inductance, capacitor are inhibited to construct multi-stage filter circuit using varistor, transient voltage in the present invention Network.First order clipping module carries out primary limit to strong electromagnetic pulse using the strong pulse suppression element varistor of through-current capability Width.Buffer module is using common mode inductance made of nickel-zinc ferrite magnet ring coiling.Second level clipping module also uses pressure-sensitive Resistance protects strong electromagnetic pulse, used in parallel with prime varistor.Low frequency filtering module is highest using magnetic conductivity Nanocrystalline core coiling common mode inductance cooperates capacitor and forms low frequency filtering net into differential mode inductance using Sendust Cores coiling Network.Third level clipping module inhibits pipe effectively to inhibit fast rise time pulse using fireballing transient voltage is cut-off.Intermediate frequency Filter module, around two cascade common mode inductances are made as, cooperates punching using the different manganese-zinc ferrite magnet ring of two kinds of magnetic conductivities Capacitor forms intermediate frequency filtering network.Fourth stage clipping module inhibits pipe to fast rise time pulse using fireballing transient voltage is cut-off Effectively inhibited.High frequency filter module uses the nickel-zinc ferrite magnet ring coiling common mode inductance of magnetic conductivity very little, cooperates punching Capacitor forms High frequency filter network.Common mode capacitance uses feedthrough capacitor and high-frequency ceramic capacitor in filter, and differential mode capacitor uses Safety capacitor.Inductance uses toroidal core in filter.Filter is divided into 4 parts by partition, wherein preceding two-stage clipping module With buffer module in first part, low frequency filtering module and third level clipping module in second part, intermediate frequency filtering module and Level Four clipping module is in Part III, and High frequency filter module is in Part IV.By on feedthrough capacitor and partition between each section Through-hole cooperation be connected to form cascade.Filter inlet-outlet line is connected by rubber ring with the through-hole cooperation on filter housing.Filter The aperture of wave device inlet-outlet line is towards vertically.The present invention is by dividing storehouse to filter, while having reached good electromagnetic shielding, limited Space in realize targetedly be classified ultrabroad band high-performance filtering.The present invention is anti-in first part's strong electromagnetic pulse To improve through-current capacity in shield, clipping module is in such a way that two-stage varistor is in parallel, to guarantee orderly opening for varistor Disconnected and through-current capacity is matched with through-current capability, and inductance buffer network is added between two-stage varistor, and equivalent long transmission line delays arteries and veins Punching reaches the rear class time, creates conditions for the successful inhibition of prime clipping device, while ensure that maximum through-current capacity.Of the invention It added the differential mode inductance with Sendust Cores coiling in low frequency filtering module behind common mode loop, make the differential mode performance of filter It can keep good in more broadband.In second part, in low frequency filtering module, common mode inductance L2, differential mode inductance L3, it is total to Mould capacitor C3 and differential mode capacitor C5 constitutes Π type and L-type filter circuit construction.The present invention is reduced by using high-frequency ceramic capacitor Capacitor high-frequency parasitic parameter, improves the high frequency characteristics of capacitor, ensure that filter reliable operation in extremely wide frequency band.Filter Wave device can utmostly increase inductance value as inductance using toroidal core, by changing size and inductive material, Ke Yifen Not Shi Xian low-frequency power and high-frequency signal effective filtering.Various pieces of the present invention are matched by feedthrough capacitor and the through-hole on partition Conjunction is connected to form cascade, is acted on by the mask filter of capacitor, prevents filter lead-in wire terminal high frequency electromagnetic radiation from filtering to rear end Circuit interference, while each point of storehouse being made to realize good ground connection, solve electromagnetic compatibility problem.The present invention is directed to different frequency range Filter network is separately designed, the filter construction for foring region filtering, inhibiting step by step, shielding between section makes variety classes magnet ring Inductance preferably played effect under different frequency range, filter can reach the insertion of 80dB or more in 150k-3G frequency band Loss realizes the high Insertion Loss filtering of ultrabroad band.Present invention is mainly applied to require filter effect high screened room electricity In source, signal cable filter.The aperture of filter inlet-outlet line largely reduced the coupling between input-output line towards vertically Effect makes filter have better shielding properties and filter effect.Epoxy resin is all made of between each filtering and clipping module Fixed encapsulation.
Inductance coiling in the present invention is wound on annular magnetic using round copper wire or flat copper wire, using single layer is close by the way of On core.In the present invention using round copper wire, it is preferred that flat copper wire can be used, flat copper wire is relative to round copper The advantages of line is can be by changing the shape of line, can be more around about 3 times than general round copper, to improve the inductance of inductance Amount, increases the filtering frequency range of filter module, and be conducive to preferably radiate, and in addition reduces by the way of using single layer is close The number of plies reduces parasitic capacitance, increases heat dissipation area, equally improves the filtering performance of product.Capacitance component in the present invention Feedthrough capacitor and high-frequency ceramic capacitor is utilized, obtains excellent high frequency characteristics while reducing filter volume, realizes Modularization, miniaturization and the Performance optimization of filter.
Four parts are connected after completing and connecting filter inlet-outlet line, answers timely encapsulating to carry out immobilising device and accelerate filter Radiating rate.
The main course of work of the present invention and principle:
As specified above and illustrative circuit connection after the completion of, by the inlet-outlet line of filter respectively with electrical equipment and electricity Source is connected, and the present invention can work normally at this time.
For the strong electromagnetic pulse in electrical equipment, the varistor in first part of the present invention plays main inhibition and makees With the electromagnetic pulse for the amplitude that can effectively decay;For the common mode interference present in electrical equipment, the present invention second, In three and four parts, the L-type filter network being made of common mode inductance and common mode capacitance plays main inhibiting effect, can be effectively Filter out the interference of L/N line over the ground;For DM EMI present in electrical equipment, in the present invention second and third and four parts, by altogether The П type filter network that leakage inductance, differential mode inductance and the differential mode capacitor of mould inductance are constituted plays main inhibiting effect, can be effective Ground filters out the interference between L line and N line.For different interference, different modules plays different effects, and ultra-wide is completed in cooperation The high-performance of frequency band filters.
The present invention takes full advantage of the structure space of filter internal, realizes and targetedly filters step by step, thinking is clear It is clear, structural integrity.Feedthrough capacitor and high-frequency ceramic capacitor is utilized in capacitance component simultaneously, obtains while reducing filter volume Excellent high frequency characteristics is obtained, modularization, miniaturization and the Performance optimization of filter is realized, has a good application prospect.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills Art field, is included within the scope of the present invention.

Claims (10)

1. it is a kind of multistage strong electromagnetic pulse protect power-supply filter, which is characterized in that including shell, first part, second part, Part III, Part IV and filter internal partition;Multistage strong electromagnetic pulse protects power-supply filter from input terminal to output end, First part, second part, Part III and Part IV are sequentially connected, and first part includes the first order clipping being sequentially connected Module, buffer network and second level clipping module, second part include the low frequency filtering module being sequentially connected and third level clipping Module, Part III include the intermediate frequency filtering module being sequentially connected and fourth stage clipping module, and Part IV includes High frequency filter Module;
Between first part and second part, between second part and Part III and between Part III and Part IV point It She You not filter internal partition.
2. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that first part In, first order clipping module uses the varistor of different model with second level clipping module, what first order clipping module used The voltage class of varistor is higher than the voltage class for the varistor that second level clipping module uses.
3. a kind of multistage strong electromagnetic pulse according to claim 2 protects power-supply filter, which is characterized in that first order limit Width module includes varistor MOV1, varistor MOV2 and varistor MOV3, varistor MOV1, varistor MOV2 and Varistor MOV3 joins end to end and forms access with cage connection;
Second level clipping module includes varistor MOV4, varistor MOV5 and varistor MOV6, varistor MOV4, pressure Quick resistance MOV5 and varistor MOV6 joins end to end and forms access with cage connection;
Two pins of varistor MOV2 are separately connected with input line L and input line N respectively, and two of varistor MOV2 draw Foot is also connect with two line conductors of buffer network (6) input terminal respectively;
Two pins of varistor MOV5 are connect with two line conductors of buffer network (6) output end respectively.
4. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that second part In, low frequency filtering module includes feedthrough capacitor C1, feedthrough capacitor C2, common mode inductance L2, common mode capacitance C3, common mode capacitance C4, difference Mould inductance L3, differential mode inductance L4 and differential mode capacitor C5;Common mode inductance L2 input terminal and second level clipping module pass through feedthrough capacitor C1 is connected with feedthrough capacitor C2;Feedthrough capacitor C1 and feedthrough capacitor C2 are contacted by the hole on filter internal partition with shell;Altogether Two line conductors of mould inductance L2 output end are connected with one end of one end of differential mode inductance L3 and differential mode inductance L4 respectively, common mode inductance L2 and the concatenated position differential mode inductance L3 and common mode capacitance is connected between shell respectively with the concatenated position differential mode inductance L4 The other end of C3 and common mode capacitance C4, differential mode inductance L3 and the other end of differential mode inductance L4 draw with two of differential mode capacitor C5 respectively Foot connection.
5. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that second part In, third level clipping module includes that transient voltage inhibits pipe TVS1, transient voltage that pipe TVS2 and transient voltage is inhibited to inhibit pipe TVS3, transient voltage inhibit pipe TVS1, transient voltage inhibit pipe TVS2 and transient voltage inhibit pipe TVS3 join end to end and with it is outer Shell connects to form access, and transient voltage inhibits pipe TVS2 to connect to form access with the output end of low frequency filtering module.
6. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that Part III In, intermediate frequency filtering module includes feedthrough capacitor C6, feedthrough capacitor C7, common mode inductance L5 and common mode inductance L6, common mode inductance L5's Two line conductors of input terminal are connect with third level clipping module by feedthrough capacitor C6 and feedthrough capacitor C7;It feedthrough capacitor C6 and wears Electrocardio holds C7 and is contacted by the hole on filter internal partition with shell;The input of the output end and common mode inductance L6 of common mode inductance L5 End connection.
7. a kind of multistage strong electromagnetic pulse according to claim 6 protects power-supply filter, which is characterized in that common mode inductance The inductance value of L5 is higher than the inductance value of common mode inductance L6.
8. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that Part III In, fourth stage clipping module includes that transient voltage inhibits pipe TVS4, transient voltage that pipe TVS5 and transient voltage is inhibited to inhibit pipe TVS6, transient voltage inhibit pipe TVS4, transient voltage inhibit pipe TVS5 and transient voltage inhibit pipe TVS6 join end to end and with it is outer Shell connects to form access, and transient voltage inhibits pipe TVS5 to connect with the output end of intermediate frequency filtering module.
9. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that Part III In, fourth stage clipping module includes that transient voltage inhibits pipe TVS4, transient voltage that pipe TVS5 and transient voltage is inhibited to inhibit pipe TVS6, transient voltage inhibit pipe TVS4, transient voltage inhibit pipe TVS5 and transient voltage inhibit pipe TVS6 join end to end and with it is outer Shell connects to form access, and transient voltage inhibits pipe TVS5 to connect with the output end of intermediate frequency filtering module.
10. a kind of multistage strong electromagnetic pulse according to claim 1 protects power-supply filter, which is characterized in that the 4th In point, High frequency filter module includes feedthrough capacitor C8, feedthrough capacitor C9 and common mode inductance L7, the two-way of common mode inductance L7 input terminal Conducting wire passes through feedthrough capacitor C8 respectively with two pins of state voltage inhibition pipe TVS5 and feedthrough capacitor C9 is connect;Feedthrough capacitor C8 It is contacted by the hole on filter internal partition with shell with feedthrough capacitor C9;Two line conductors of common mode inductance L7 output end respectively with Output line L and output line N are separately connected.
CN201910810608.3A 2019-08-29 2019-08-29 Multistage strong electromagnetic pulse protection power filter Active CN110429604B (en)

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