CN110429604B - Multistage strong electromagnetic pulse protection power filter - Google Patents
Multistage strong electromagnetic pulse protection power filter Download PDFInfo
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- CN110429604B CN110429604B CN201910810608.3A CN201910810608A CN110429604B CN 110429604 B CN110429604 B CN 110429604B CN 201910810608 A CN201910810608 A CN 201910810608A CN 110429604 B CN110429604 B CN 110429604B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a multistage strong electromagnetic pulse protection power filter, wherein the interior of a filter is divided into four parts by partition plates, the filter comprises eight modules, a first-stage amplitude limiting module, a buffer network, a second-stage amplitude limiting module, a low-frequency filter module, a third-stage amplitude limiting module, an intermediate-frequency filter module, a fourth-stage amplitude limiting module and a high-frequency filter module, and a multistage filter circuit network is constructed by adopting devices such as a piezoresistor, a transient voltage suppression tube, an inductor, a capacitor and the like. The modules between the adjacent parts are matched with the through holes on the partition plates through the feedthrough capacitors to form cascade connection, so that good grounding and electromagnetic shielding of each part are realized. The invention fully utilizes the structural space in the filter, realizes targeted step-by-step filtering, and has clear thought and complete structure. Meanwhile, the capacitor assembly utilizes the feedthrough capacitor and the high-frequency ceramic capacitor, so that the size of the filter is reduced, excellent high-frequency characteristics are obtained, and modularization, miniaturization and performance optimization of the filter are realized.
Description
Technical Field
The invention relates to the field of filters, in particular to a multistage strong electromagnetic pulse protection power filter.
Background
With the rapid development of power electronic technology, the electromagnetic environment is increasingly complex, and equipment based on electronic circuits is easily interfered by electromagnetic pulses to cause equipment failure. The power supply is an important component of the equipment as the input end of the equipment energy, and a power supply system takes the lead under the interference of strong electromagnetic pulses. Therefore, the design and development of the power filter for protecting against strong electromagnetic pulses have important significance for the safe operation of equipment.
Generally, a power filter is mounted at a power input port, and the power filter has two main purposes, namely, electromagnetic interference entering sensitive equipment or a system through a power line is inhibited; the second is to suppress conducted emissions of the device or system itself. With the development of filtering technology, how to flexibly transform circuit structure parameters in a limited space to obtain an excellent ultra-wide frequency band (especially a high frequency band) filtering effect is a hotspot and difficulty of current research. The existing filters are various in types, but the problems of weak amplitude limiting capability and poor high-frequency characteristics are always difficult to solve, the highest effective filtering frequency of a common power supply filter can only reach 30MHz, the filtering effect of the filtering magnetic flux of a signal cable is extremely limited, and the relevant standards of electromagnetic compatibility are difficult to meet.
Disclosure of Invention
The invention aims to provide a multistage strong electromagnetic pulse protection power filter to overcome the technical problem in the prior art that how to flexibly convert circuit structure parameters in a limited space to obtain an excellent ultra-wide frequency band (especially a high frequency band) filtering effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-stage strong electromagnetic pulse protection power filter comprises a shell, a first part, a second part, a third part, a fourth part and a filter inner partition plate; the multistage strong electromagnetic pulse protection power filter comprises a first part, a second part, a third part and a fourth part which are sequentially connected from an input end to an output end, wherein the first part comprises a first-stage amplitude limiting module, a buffer network and a second-stage amplitude limiting module which are sequentially connected;
and filter internal baffles are arranged between the first part and the second part, between the second part and the third part and between the third part and the fourth part respectively.
In the first part, the first-stage amplitude limiting module and the second-stage amplitude limiting module adopt varistors of different models, and the voltage level of the varistors adopted by the first-stage amplitude limiting module is higher than that of the varistors adopted by the second-stage amplitude limiting module.
The first-stage amplitude limiting module comprises a voltage dependent resistor MOV1, a voltage dependent resistor MOV2 and a voltage dependent resistor MOV3, wherein the voltage dependent resistor MOV1, the voltage dependent resistor MOV2 and the voltage dependent resistor MOV3 are connected end to end and are connected with the shell to form a passage;
the second-stage amplitude limiting module comprises a voltage dependent resistor MOV4, a voltage dependent resistor MOV5 and a voltage dependent resistor MOV6, wherein the voltage dependent resistor MOV4, the voltage dependent resistor MOV5 and the voltage dependent resistor MOV6 are connected end to end and are connected with the shell to form a passage;
two pins of the voltage dependent resistor MOV2 are respectively connected with an input line L and an input line N, and two pins of the voltage dependent resistor MOV2 are also respectively connected with two lines of wires at the input end of the buffer network;
two pins of the voltage dependent resistor MOV5 are respectively connected with two wires at the output end of the buffer network.
In the second part, the low-frequency filtering module comprises a feedthrough capacitor C1, a feedthrough capacitor C2, a common-mode inductor L2, a common-mode capacitor C3, a common-mode capacitor C4, a differential-mode inductor L3, a differential-mode inductor L4 and a differential-mode capacitor C5; the input end of the common-mode inductor L2 is connected with the second-stage amplitude limiting module through a feedthrough capacitor C1 and a feedthrough capacitor C2; the feedthrough capacitor C1 and the feedthrough capacitor C2 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L2 are respectively connected in series with one end of a differential mode inductor L3 and one end of a differential mode inductor L4, a common mode capacitor C3 and a common mode capacitor C4 are respectively connected between the part of the common mode inductor L2 connected in series with the differential mode inductor L3 and the part of the common mode inductor L4 connected in series with the shell, and the other end of the differential mode inductor L3 and the other end of the differential mode inductor L4 are respectively connected with two pins of the differential mode capacitor C5.
In the second part, the third-stage amplitude limiting module comprises a transient voltage suppression tube TVS1, a transient voltage suppression tube TVS2 and a transient voltage suppression tube TVS3, the transient voltage suppression tube TVS1, the transient voltage suppression tube TVS2 and the transient voltage suppression tube TVS3 are connected end to end and are connected with the shell to form a passage, and the transient voltage suppression tube TVS2 is connected with the output end of the low-frequency filtering module to form a passage.
In the third part, the intermediate frequency filter module comprises a feedthrough capacitor C6, a feedthrough capacitor C7, a common mode inductor L5 and a common mode inductor L6, and two wires at the input end of the common mode inductor L5 are connected with the third-stage amplitude limiting module through the feedthrough capacitor C6 and the feedthrough capacitor C7; the feedthrough capacitor C6 and the feedthrough capacitor C7 are in contact with the shell through holes in the inner partition plate of the filter; the output terminal of the common mode inductor L5 is connected to the input terminal of the common mode inductor L6.
The inductance of the common mode inductor L5 is higher than the inductance of the common mode inductor L6.
In the third part, the fourth stage amplitude limiting module comprises a transient voltage suppression tube TVS4, a transient voltage suppression tube TVS5 and a transient voltage suppression tube TVS6, the transient voltage suppression tube TVS4, the transient voltage suppression tube TVS5 and the transient voltage suppression tube TVS6 are connected end to end and are connected with the housing to form a passage, and the transient voltage suppression tube TVS5 is connected with the output end of the intermediate frequency filter module.
In the fourth part, the high-frequency filtering module comprises a feedthrough capacitor C8, a feedthrough capacitor C9 and a common-mode inductor L7, wherein two leads at the input end of the common-mode inductor L7 are respectively connected with two pins of a state voltage suppressor TVS5 through a feedthrough capacitor C8 and a feedthrough capacitor C9; the feedthrough capacitor C8 and the feedthrough capacitor C9 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L7 are respectively connected with an output line L and an output line N.
Input line L, input line N of multistage strong electromagnetic pulse protection power filter, output line L and output line N pass through the rubber circle and link to each other with the through-hole cooperation on the shell, and input line L, input line N, the trompil perpendicular to shell that output line L and output line N correspond.
The invention has the following beneficial technical effects:
the filter inner baffles are respectively arranged between the first part and the second part, between the second part and the third part and between the third part and the fourth part of the multistage strong electromagnetic pulse protection power filter, so that the ultra-wideband high-performance filtering with pertinence and grading is realized in a limited space while good electromagnetic shielding is achieved. In order to improve the on-flow in the first part of strong electromagnetic pulse protection, the amplitude limiting module adopts a mode that a first-stage amplitude limiting module and a second-stage amplitude limiting module are connected in parallel, and in order to ensure that the first-stage amplitude limiting module and the second-stage amplitude limiting module are sequentially switched on and off and the on-flow is matched with the through-flow capacity, an inductance buffer network is added between the first-stage amplitude limiting module and the second-stage amplitude limiting module, so that the inductance buffer network is equivalent to a long transmission line, the time of the pulse reaching the later stage is delayed, conditions are created for successfully inhibiting a preceding-stage amplitude limiting device, and. The invention can respectively design a multi-stage strong electromagnetic pulse protection power filter aiming at different frequency bands, forms a filter structure with sectional filtering, step-by-step inhibition and intersegment shielding, and realizes the high insertion loss filtering of the ultra-wide band.
Drawings
FIG. 1 is a schematic diagram of an overall appearance structure of a multi-stage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 2 is a schematic diagram of the overall layout structure of the multistage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 3 is a schematic diagram of the overall circuit structure of the circuit connection in the multistage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 4 is a schematic circuit diagram of a first part of the multistage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 5 is a schematic circuit diagram of a second part of the multistage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 6 is a schematic circuit diagram of a third part of the multistage strong electromagnetic pulse protection power filter according to the present invention;
FIG. 7 is a schematic circuit diagram of a fourth part of the multi-stage strong electromagnetic pulse protection power filter according to the present invention;
wherein: 1-housing, 2-first filter inner baffle, 3-second filter inner baffle, 4-third filter inner baffle, 5-hole, 6-buffer network.
Detailed Description
The invention is described in further detail below with reference to the attached drawings so that the advantages and features of the invention can be more easily understood by those skilled in the art, and thus the scope of the invention is more clearly and clearly defined.
Referring to fig. 2, the multistage strong electromagnetic pulse protection power filter of the present invention includes a housing 1, a first portion, a second portion, a third portion, a fourth portion, and a filter inner partition; the multistage strong electromagnetic pulse protection power filter comprises a first part, a second part, a third part and a fourth part which are sequentially connected from an input end to an output end, wherein the first part comprises a first-stage amplitude limiting module, a buffer network and a second-stage amplitude limiting module which are sequentially connected; and filter internal baffles are arranged between the first part and the second part, between the second part and the third part and between the third part and the fourth part respectively.
Referring to fig. 3 and 4, in the first part of the present invention, the first level limiting module and the second level limiting module use different types of voltage dependent resistors, and the voltage level of the voltage dependent resistor used by the first level limiting module is higher than that of the voltage dependent resistor used by the second level limiting module. The first-stage amplitude limiting module comprises a voltage dependent resistor MOV1, a voltage dependent resistor MOV2 and a voltage dependent resistor MOV3, wherein the voltage dependent resistor MOV1, the voltage dependent resistor MOV2 and the voltage dependent resistor MOV3 are connected end to end and are connected with the shell to form a passage; the second-stage amplitude limiting module comprises a voltage dependent resistor MOV4, a voltage dependent resistor MOV5 and a voltage dependent resistor MOV6, wherein the voltage dependent resistor MOV4, the voltage dependent resistor MOV5 and the voltage dependent resistor MOV6 are connected end to end and are connected with the shell to form a passage; two pins of the varistor MOV2 are respectively connected with the input line L and the input line N, and two pins of the varistor MOV2 are also respectively connected with two lines of wires at the input end of the buffer network 6; two pins of the voltage dependent resistor MOV5 are respectively connected with two wires at the output end of the buffer network 6.
Referring to fig. 3 and 5, in the second part of the present invention, the low frequency filtering module includes a feedthrough capacitor C1, a feedthrough capacitor C2, a common mode inductor L2, a common mode capacitor C3, a common mode capacitor C4, a differential mode inductor L3, a differential mode inductor L4, and a differential mode capacitor C5; two wires at the input end of the common mode inductor L2 are respectively connected with two pins of a piezoresistor MOV5 through a feedthrough capacitor C1 and a feedthrough capacitor C2; the feedthrough capacitor C1 and the feedthrough capacitor C2 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L2 are respectively connected in series with one end of a differential mode inductor L3 and one end of a differential mode inductor L4, a common mode capacitor C3 and a common mode capacitor C4 are respectively connected between the part of the common mode inductor L2 connected in series with the differential mode inductor L3 and the part of the common mode inductor L4 connected in series with the shell, and the other end of the differential mode inductor L3 and the other end of the differential mode inductor L4 are respectively connected with two pins of the differential mode capacitor C5; the third-stage amplitude limiting module comprises a transient voltage suppression tube TVS1, a transient voltage suppression tube TVS2 and a transient voltage suppression tube TVS3, wherein the transient voltage suppression tube TVS1, the transient voltage suppression tube TVS2 and the transient voltage suppression tube TVS3 are connected end to end and are connected with the shell to form a passage, and two pins of the transient voltage suppression tube TVS2 are respectively connected with two pins of the differential mode capacitor C5 to form a passage.
Referring to fig. 3 and 6, in the third part, the intermediate frequency filter module includes a feedthrough capacitor C6, a feedthrough capacitor C7, a common mode inductor L5, and a common mode inductor L6, and two wires at an input end of the common mode inductor L5 are connected to two pins of the transient voltage suppressor TVS2 through the feedthrough capacitor C6 and the feedthrough capacitor C7, respectively; the feedthrough capacitor C6 and the feedthrough capacitor C7 are in contact with the shell through holes in the inner partition plate of the filter; the output end of the common-mode inductor L5 is connected with the input end of the common-mode inductor L6; the fourth-stage amplitude limiting module comprises a transient voltage suppression tube TVS4, a transient voltage suppression tube TVS5 and a transient voltage suppression tube TVS6, the transient voltage suppression tube TVS4, the transient voltage suppression tube TVS5 and the transient voltage suppression tube TVS6 are connected end to end and are connected with the shell to form a passage, and two pins of the transient voltage suppression tube TVS5 are respectively connected with two wires at the output end of the common-mode inductor L6. The inductance of the common mode inductor L5 is higher than the inductance of the common mode inductor L6.
Referring to fig. 3 and 7, in the fourth part, the high-frequency filtering module includes a feedthrough capacitor C8, a feedthrough capacitor C9, and a common mode inductor L7, and two wires at the input end of the common mode inductor L7 are connected to two pins of the state voltage suppressor TVS5 through a feedthrough capacitor C8 and a feedthrough capacitor C9, respectively; the feedthrough capacitor C8 and the feedthrough capacitor C9 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L7 are respectively connected with an output line L and an output line N.
In four parts of the transparent multistage strong electromagnetic pulse protection power filter, two adjacent parts are separated by a partition plate in the filter, and modules on two sides of the partition plate are correspondingly connected by a feedthrough capacitor to form good grounding and electromagnetic shielding.
When the first part is connected, firstly, an input line L and an input line N of the filter are respectively connected with two pins of the varistor MOV2, secondly, the varistor MOV1, the varistor MOV2 and the varistor MOV3 are connected end to end and are connected with the shells on two sides to form a passage, and the two pins of the varistor MOV2 are connected with two wires at the input end of the buffer network 6; the piezoresistor MOV4, the piezoresistor MOV5 and the piezoresistor MOV6 are connected end to end and are connected with the shells on the two sides to form a passage, and two pins of the piezoresistor MOV5 are connected with two wires at the output end of the buffer network 6 to form the passage. The models of the piezoresistors adopted by the two-stage amplitude limiting modules are different, the piezoresistor with higher voltage level is adopted by the first-stage amplitude limiting module, so that the strong electromagnetic pulse is quickly reduced into a small pulse, the small pulse is continuously reduced by the piezoresistor with lower voltage level of the second-stage amplitude limiting module after passing through the buffer network 6, and the strong electromagnetic pulse can be effectively inhibited through the piezoresistors with different voltage levels of the front and the rear stages. The buffer network employs a filter common mode inductor L1.
When the second part is connected, the feedthrough capacitor C1 and the feedthrough capacitor C2 are in good contact with the housing 1 through the hole 5 on the partition board 2 in the first filter, pins at two ends of the feedthrough capacitor C1 and the feedthrough capacitor C2 are respectively connected with the varistor MOV5 and the common-mode inductor L2 in the first part to form a passage, two paths at the output end of the common-mode inductor L2 are respectively connected in series with the differential-mode inductor L3 and the differential-mode inductor L4, a common-mode capacitor C3 and a common-mode capacitor C4 are respectively connected between two paths at the series connection position and the housing, and then two paths at the idle end of the differential-mode inductor L3 and the differential-mode inductor L4 are respectively connected with two pins of the differential-mode capacitor C5. In the third stage of amplitude limiting module, the transient voltage suppression tube TVS1, the transient voltage suppression tube TVS2 and the transient voltage suppression tube TVS3 are connected end to end and are connected with the shells on the two sides to form a channel, and then the two pins of the transient voltage suppression tube TVS2 are respectively connected with the two pins of the differential mode capacitor C5 to form a channel. The common-mode capacitor C3 and the common-mode capacitor C4 are high-frequency ceramic capacitors, the high-frequency characteristic of the capacitors is improved, the two sides of the capacitors are plated with silver to form two electrodes of the capacitors, the inner side electrode plate layer of the capacitor assembly is slightly shorter than the outer side electrode plate layer by at least 2mm, and the common-mode capacitor C3 and the common-mode capacitor C4 are used for internal electrical insulation when the modules are connected in series and meet the voltage withstanding.
In the third part, the inductance value of the common mode inductor L5 is higher than that of the common mode inductor L6, a structure of filtering wave step by step is formed, the feedthrough capacitor C6 and the feedthrough capacitor C7 are in good contact with the housing 1 through the hole 5 on the partition plate 3 in the second filter, the pins at the two ends of the feedthrough capacitor C6 and the feedthrough capacitor C7 are respectively connected with the transient voltage suppressor TVS2 and the common mode inductor L5 in the second part to form a passage, and the common mode inductor L5 is connected with the common mode inductor L6 in series. The transient voltage suppression tube TVS4, the transient voltage suppression tube TVS5 and the transient voltage suppression tube TVS6 in the third-stage amplitude limiting module are connected end to end and connected with the shells on the two sides to form a passage, and then two pins of the transient voltage suppression tube TVS5 are connected with two lines at the idle end of the common-mode inductor L6 respectively to form a passage.
The invention adopts the devices such as a piezoresistor, a transient voltage suppressor, an inductor, a capacitor and the like to construct a multistage filter circuit network. The first-stage amplitude limiting module adopts a pulse suppression element piezoresistor with strong current capacity to carry out primary amplitude limiting on strong electromagnetic pulses. The buffer module adopts a common mode inductor formed by winding a nickel-zinc ferrite magnetic ring. The second-stage amplitude limiting module also adopts a piezoresistor to protect strong electromagnetic pulses and is used in parallel with the preceding-stage piezoresistor. The low-frequency filter module adopts a nanocrystalline magnetic ring with the highest magnetic conductivity to wind a common-mode inductor, and a capacitor is matched with a differential-mode inductor formed by winding a Fe-Si-Al magnetic ring to form a low-frequency filter network. The third-stage amplitude limiting module adopts a transient voltage suppression tube with high switching speed to effectively suppress the fast leading edge pulse. The intermediate frequency filter module adopts two manganese zinc ferrite magnetic rings with different magnetic conductivities to wind as two cascaded common mode inductors, and forms an intermediate frequency filter network by matching with the feedthrough capacitor. The fourth-stage amplitude limiting module effectively inhibits the fast leading-edge pulse by adopting a transient voltage inhibition tube with high switching speed. The high-frequency filter module adopts a nickel-zinc ferrite magnetic ring with small magnetic conductivity to wind a common-mode inductor and forms a high-frequency filter network by matching with a feedthrough capacitor. The common mode capacitor in the filter adopts a feedthrough capacitor and a high-frequency ceramic capacitor, and the differential mode capacitor adopts an ampere-standard capacitor. The inductor in the filter adopts a ring-shaped magnetic core. The filter is divided into 4 parts by a partition plate, wherein the front two-stage amplitude limiting module and the buffer module are arranged on the first part, the low-frequency filtering module and the third-stage amplitude limiting module are arranged on the second part, the intermediate-frequency filtering module and the fourth-stage amplitude limiting module are arranged on the third part, and the high-frequency filtering module is arranged on the fourth part. All parts are connected with the through holes on the partition board in a matching way through the feedthrough capacitors to form cascade connection. The filter inlet and outlet wires are connected with the through hole on the filter shell in a matched mode through the rubber ring. The filter access line openings are oriented vertically. The invention achieves good electromagnetic shielding and realizes targeted and graded ultra-wideband high-performance filtering in a limited space by dividing the filter. In order to improve the on-flow in the first part of strong electromagnetic pulse protection, the amplitude limiting module adopts a mode of connecting two stages of piezoresistors in parallel, and in order to ensure the orderly on-off of the piezoresistors and the matching of the on-flow and the through-flow capacity, an inductance buffer network is added between the two stages of piezoresistors to be equivalent to a long transmission line, delay the time of the pulse reaching the later stage, create conditions for the successful inhibition of a preceding stage amplitude limiting device, and simultaneously ensure the maximum on-flow. In the low-frequency filter module, the differential mode inductor wound by the iron-silicon-aluminum magnetic ring is added behind the common mode ring, so that the differential mode performance of the filter can be kept good in a wider frequency band. In the second part, in the low-frequency filtering module, a common-mode inductor L2, a differential-mode inductor L3, a common-mode capacitor C3 and a differential-mode capacitor C5 form pi-type and L-type filtering circuit structures. By adopting the high-frequency ceramic capacitor, the invention reduces the high-frequency parasitic parameters of the capacitor, improves the high-frequency characteristic of the capacitor and ensures that the filter works reliably in an extremely wide frequency band. The filter adopts the annular magnetic core as the inductance can furthest increase inductance value, through changing size and inductance material, can realize the effective filtering of low frequency power and high frequency signal respectively. All parts of the invention are connected with the through holes on the partition board in a matching way through the feedthrough capacitors to form cascade connection, and the interference of high-frequency electromagnetic radiation at the inlet end of the filter on a rear-end filter circuit is prevented through the shielding and filtering action of the capacitors, and simultaneously, each sub-bin realizes good grounding, thereby solving the problem of electromagnetic compatibility. The invention designs filter networks aiming at different frequency bands respectively, forms a filter structure with sectional filtering, step-by-step inhibition and intersegment shielding, ensures that the inductors of different types of magnetic rings better play a role in different frequency bands, and the filter can reach the insertion loss of more than 80dB in a 150k-3G frequency band, thereby realizing the high insertion loss filtering of an ultra-wide frequency band. The invention is mainly applied to a shielding room power supply and a signal cable filter with extremely high requirements on the filtering effect. The openings of the inlet and outlet wires of the filter are vertical, so that the coupling effect between the input and output wires is greatly weakened, and the filter has better shielding performance and filtering effect. And the filtering and amplitude limiting modules are fixedly packaged by adopting epoxy resin.
The inductance winding wire adopts a round copper wire or a flat copper wire and is wound on the annular magnetic core in a single-layer close winding mode. The round copper wire is adopted in the invention, preferably, a flat copper wire can be adopted, and compared with the round copper wire, the flat copper wire has the advantages that the shape of the wire can be changed, and the winding is about 3 times more than that of the common round copper wire, so that the inductance of the inductor is improved, the filtering frequency band of the filtering module is increased, better heat dissipation is facilitated, in addition, the number of layers is reduced by adopting a single-layer close winding mode, the parasitic capacitance is reduced, the heat dissipation area is increased, and the filtering performance of the product is also improved. The capacitor assembly utilizes the feedthrough capacitor and the high-frequency ceramic capacitor, obtains excellent high-frequency characteristics while reducing the volume of the filter, and realizes modularization, miniaturization and performance optimization of the filter.
After the four parts are connected and connected with the inlet and outlet wires of the filter, glue is filled in time to fix the device and accelerate the heat dissipation speed of the filter.
The main working process and principle of the invention are as follows:
after the connection is completed according to the above description and the circuit diagram shown in the figure, the incoming and outgoing lines of the filter are respectively connected with the electric equipment and the power supply, and at this time, the invention can work normally.
Aiming at strong electromagnetic pulses in electric equipment, the piezoresistor in the first part of the invention plays a main inhibiting role, and can effectively attenuate the electromagnetic pulses with high amplitude; aiming at common-mode interference existing in electric equipment, in the second part, the third part and the fourth part of the invention, an L-shaped filter network formed by a common-mode inductor and a common-mode capacitor plays a main inhibiting role, and can effectively filter the interference of an L/N line to the ground; aiming at differential mode interference existing in electric equipment, in the second part, the third part and the fourth part of the invention, the pi-type filter network formed by leakage inductance of a common mode inductor, differential mode inductance and differential mode capacitance plays a main role in inhibiting, and can effectively filter the interference between an L line and an N line. Aiming at different interferences, different modules exert different effects and cooperate to finish the high-performance filtering of the ultra-wide band.
The invention fully utilizes the structural space in the filter, realizes targeted step-by-step filtering, and has clear thought and complete structure. Meanwhile, the capacitor assembly utilizes the feedthrough capacitor and the high-frequency ceramic capacitor, obtains excellent high-frequency characteristics while reducing the size of the filter, realizes modularization, miniaturization and performance optimization of the filter, and has good application prospect.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A multi-stage strong electromagnetic pulse protection power filter is characterized by comprising a shell, a first part, a second part, a third part, a fourth part and a filter inner partition plate; the multistage strong electromagnetic pulse protection power filter comprises a first part, a second part, a third part and a fourth part which are sequentially connected from an input end to an output end, wherein the first part comprises a first-stage amplitude limiting module, a buffer network and a second-stage amplitude limiting module which are sequentially connected;
inner filter baffles are arranged between the first part and the second part, between the second part and the third part and between the third part and the fourth part respectively;
in the first part, a first-stage amplitude limiting module and a second-stage amplitude limiting module adopt varistors with different models, and the voltage level of the varistors adopted by the first-stage amplitude limiting module is higher than that of the varistors adopted by the second-stage amplitude limiting module;
in the second part, the low-frequency filtering module comprises a feedthrough capacitor C1, a feedthrough capacitor C2, a common-mode inductor L2, a common-mode capacitor C3, a common-mode capacitor C4, a differential-mode inductor L3, a differential-mode inductor L4 and a differential-mode capacitor C5; the input end of the common-mode inductor L2 is connected with the second-stage amplitude limiting module through a feedthrough capacitor C1 and a feedthrough capacitor C2; the feedthrough capacitor C1 and the feedthrough capacitor C2 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L2 are respectively connected in series with one end of a differential mode inductor L3 and one end of a differential mode inductor L4, a common mode capacitor C3 and a common mode capacitor C4 are respectively connected between the part of the common mode inductor L2 connected in series with the differential mode inductor L3 and the part of the common mode inductor L4 connected in series with the shell, and the other end of the differential mode inductor L3 and the other end of the differential mode inductor L4 are respectively connected with two pins of the differential mode capacitor C5;
in the third part, the intermediate frequency filter module comprises a feedthrough capacitor C6, a feedthrough capacitor C7, a common mode inductor L5 and a common mode inductor L6, and two wires at the input end of the common mode inductor L5 are connected with the third-stage amplitude limiting module through the feedthrough capacitor C6 and the feedthrough capacitor C7; the feedthrough capacitor C6 and the feedthrough capacitor C7 are in contact with the shell through holes in the inner partition plate of the filter; the output end of the common-mode inductor L5 is connected with the input end of the common-mode inductor L6;
in the fourth part, the high-frequency filtering module comprises a feedthrough capacitor C8, a feedthrough capacitor C9 and a common-mode inductor L7, wherein two leads at the input end of the common-mode inductor L7 are respectively connected with two pins of a state voltage suppressor TVS5 through a feedthrough capacitor C8 and a feedthrough capacitor C9; the feedthrough capacitor C8 and the feedthrough capacitor C9 are in contact with the shell through holes in the inner partition plate of the filter; two wires at the output end of the common mode inductor L7 are respectively connected with an output line L and an output line N.
2. The multistage strong electromagnetic pulse protection power filter according to claim 1, characterized in that the first stage amplitude limiting module comprises a voltage dependent resistor MOV1, a voltage dependent resistor MOV2 and a voltage dependent resistor MOV3, wherein the voltage dependent resistor MOV1, the voltage dependent resistor MOV2 and the voltage dependent resistor MOV3 are connected end to end and are connected with the housing to form a passage;
the second-stage amplitude limiting module comprises a voltage dependent resistor MOV4, a voltage dependent resistor MOV5 and a voltage dependent resistor MOV6, wherein the voltage dependent resistor MOV4, the voltage dependent resistor MOV5 and the voltage dependent resistor MOV6 are connected end to end and are connected with the shell to form a passage;
two pins of the voltage dependent resistor MOV2 are respectively connected with an input line L and an input line N, and two pins of the voltage dependent resistor MOV2 are also respectively connected with two lines of wires at the input end of the buffer network (6);
two pins of the voltage dependent resistor MOV5 are respectively connected with two wires at the output end of the buffer network (6).
3. The multi-stage strong electromagnetic pulse protection power filter of claim 1, wherein in the second section, the third stage of limiting module comprises a transient voltage suppressor TVS1, a transient voltage suppressor TVS2, and a transient voltage suppressor TVS3, wherein the transient voltage suppressor TVS1, the transient voltage suppressor TVS2, and the transient voltage suppressor TVS3 are connected end to end and connected to the housing to form a channel, and the transient voltage suppressor TVS2 is connected to the output terminal of the low frequency filtering module to form a channel.
4. The filter of claim 1, wherein the inductance of the common mode inductor L5 is higher than the inductance of the common mode inductor L6.
5. The multi-stage strong electromagnetic pulse protection power filter of claim 1, wherein in the third section, the fourth stage clipping module comprises a transient voltage suppression tube TVS4, a transient voltage suppression tube TVS5 and a transient voltage suppression tube TVS6, the transient voltage suppression tube TVS4, the transient voltage suppression tube TVS5 and the transient voltage suppression tube TVS6 are connected end to end and connected to the housing to form a passage, and the transient voltage suppression tube TVS5 is connected to the output terminal of the intermediate frequency filtering module.
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| CN111092420A (en) * | 2019-12-26 | 2020-05-01 | 中国电子科技网络信息安全有限公司 | High-power capacity and high-power microwave protection device |
| CN111565482B (en) * | 2020-05-28 | 2021-06-01 | 中国人民解放军陆军工程大学 | Radio frequency front end integrated electromagnetic protection circuit |
| CN111781916A (en) * | 2020-07-01 | 2020-10-16 | 东风越野车有限公司 | Anti-electromagnetic interference integrated controller for whole vehicle |
| CN111865247A (en) * | 2020-08-26 | 2020-10-30 | 江苏沃姆克电子科技有限公司 | Multistage capacitor feed-through type power filter |
| CN112117984A (en) * | 2020-10-15 | 2020-12-22 | 北京飞宇微电子电路有限责任公司 | Pretreatment module |
| CN115225043A (en) * | 2022-07-27 | 2022-10-21 | 中国民航大学 | Electromagnetic protection circuit for low-noise amplifier of Beidou receiver |
| CN115833788B (en) * | 2022-11-29 | 2024-07-02 | 中船重工安谱（湖北）仪器有限公司 | Multi-order filter for ion mobility instrument |
| CN116014695B (en) * | 2022-12-06 | 2023-09-08 | 中国电力科学研究院有限公司 | Strong electromagnetic pulse protection device for electric power secondary equipment and parameter determination method and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584890U (en) * | 2009-03-20 | 2010-09-15 | 刘建新 | High-power single-phase power supply filter |
| CN202068186U (en) * | 2010-12-20 | 2011-12-07 | 西安开容电子技术有限责任公司 | Combined type filter used for shielding shelter power and signal of low-leakage current |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
| CN206389275U (en) * | 2017-01-23 | 2017-08-08 | 中国人民解放军61489部队 | A kind of high-power electromagnetic pulse protection module for power line |
| CN206452108U (en) * | 2017-01-24 | 2017-08-29 | 成都新欣神风电子科技有限公司 | RS232 serial data circuit electromagnetic pulse Surge Protectors |
| CN207732736U (en) * | 2018-02-07 | 2018-08-14 | 北京泰派斯特科技发展有限公司 | Wide band filter |
-
2019
- 2019-08-29 CN CN201910810608.3A patent/CN110429604B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201584890U (en) * | 2009-03-20 | 2010-09-15 | 刘建新 | High-power single-phase power supply filter |
| CN202068186U (en) * | 2010-12-20 | 2011-12-07 | 西安开容电子技术有限责任公司 | Combined type filter used for shielding shelter power and signal of low-leakage current |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
| CN206389275U (en) * | 2017-01-23 | 2017-08-08 | 中国人民解放军61489部队 | A kind of high-power electromagnetic pulse protection module for power line |
| CN206452108U (en) * | 2017-01-24 | 2017-08-29 | 成都新欣神风电子科技有限公司 | RS232 serial data circuit electromagnetic pulse Surge Protectors |
| CN207732736U (en) * | 2018-02-07 | 2018-08-14 | 北京泰派斯特科技发展有限公司 | Wide band filter |
Non-Patent Citations (1)
| Title |
|---|
| 电磁脉冲D_dot电场传感器的设计与优化;齐路等;《高压电器》;20180716;第54卷(第7期);第237-241及247页 * |
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