CN220935149U - Filter assembly - Google Patents
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- CN220935149U CN220935149U CN202322888210.6U CN202322888210U CN220935149U CN 220935149 U CN220935149 U CN 220935149U CN 202322888210 U CN202322888210 U CN 202322888210U CN 220935149 U CN220935149 U CN 220935149U
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- filter
- circuit
- lightning protection
- socket
- filter assembly
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- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000001052 transient effect Effects 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 abstract description 6
- 238000003780 insertion Methods 0.000 description 10
- 230000037431 insertion Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- RZVHIXYEVGDQDX-UHFFFAOYSA-N 9,10-anthraquinone Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 RZVHIXYEVGDQDX-UHFFFAOYSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
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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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- Filters And Equalizers (AREA)
Abstract
The utility model provides a filter assembly comprising: a socket; the lightning protection circuit is connected with the socket and used for absorbing and discharging lightning energy led in through the socket; the filter circuit is connected with the lightning protection circuit, adopts a three-phase filter circuit with combined filtering of capacitance and inductance, adopts a common-mode inductance, six differential-mode capacitances, twelve common-mode capacitances, two diodes and two voltage-stabilizing diodes, is grounded through the voltage-stabilizing diodes, and is used for electromagnetic compatibility protection, and is provided with a filter component which comprises two energy storage capacitances; the lead wires are connected between the socket and the lightning protection circuit and between the lightning protection circuit and the filter circuit. The filter solves the problem that the lightning protection component and the electromagnetic compatibility component are required to be additionally arranged at the same time in the prior art.
Description
Technical Field
The utility model relates to the technical field of electrical engineering, in particular to a filter assembly.
Background
In the flight control system, the filter can inhibit high-frequency noise signals, improve the closed-loop motion characteristic of the aircraft and improve the stability of a closed-loop of a man-machine. However, lightning strike can cause damage to airborne electrical and electronic equipment when discharging the aircraft body, so that serious safety hazard is caused, and the airborne equipment is required to be subjected to lightning protection design in order to ensure the electromagnetic environment safety and airworthiness requirements of the product. In addition, when the filter device works at the same time, a plurality of functional circuits can radiate electromagnetic interference to the space at the same time, according to the principle that the electromagnetic interference counteracts each other, one part of the functional circuits can be counteracted, the other part of the functional circuits can influence the normal work of other devices in a space coupling mode, and the coupling of a power line can be converted into a conduction interference mode to influence a power supply; therefore, the design of electromagnetic compatibility protection should be performed, and electromagnetic environment effect test should be performed according to the specific requirements of all working modes of the electromagnetic compatibility protection device so as to verify the compatibility of the electromagnetic compatibility protection device and the adaptability to electromagnetic environment.
Disclosure of utility model
The utility model mainly aims to provide a filter assembly, which at least solves the problem that a filter in the prior art is required to be additionally provided with a lightning protection assembly and an electromagnetic compatibility assembly.
In order to achieve the above object, the present utility model provides a filter assembly comprising: a socket; the lightning protection circuit is connected with the socket and used for absorbing and discharging lightning energy led in through the socket; the filter circuit is connected with the lightning protection circuit, adopts a three-phase filter circuit with combined filtering of capacitance and inductance, adopts a common-mode inductance, six differential-mode capacitances, twelve common-mode capacitances, two diodes and two voltage-stabilizing diodes, is grounded through the voltage-stabilizing diodes, and is used for electromagnetic compatibility protection, and is provided with a filter component which comprises two energy storage capacitances; the lead wires are connected between the socket and the lightning protection circuit and between the lightning protection circuit and the filter circuit.
Further, the case of the filter assembly is made of aluminum alloy plate 6061.
Further, the lightning protection circuit adopts a transient surge suppressor.
Further, the transient surge suppressor is connected in parallel with the socket.
Further, six differential mode capacitors are grouped in each three, and one end of each differential mode capacitor is electrically connected with each other and grounded.
The filter component of the technical scheme of the utility model comprises: a socket; the lightning protection circuit is connected with the socket and used for absorbing and discharging lightning energy led in through the socket; the filter circuit is connected with the lightning protection circuit, adopts a three-phase filter circuit with combined filtering of capacitance and inductance, adopts a common-mode inductance, six differential-mode capacitances, twelve common-mode capacitances, two diodes and two voltage-stabilizing diodes, is grounded through the voltage-stabilizing diodes, and is used for electromagnetic compatibility protection, and is provided with a filter component which comprises two energy storage capacitances; the lead wires are connected between the socket and the lightning protection circuit and between the lightning protection circuit and the filter circuit. The filter solves the problem that the lightning protection component and the electromagnetic compatibility component are required to be additionally arranged at the same time in the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic circuit diagram of an alternative filter assembly according to an embodiment of the utility model;
FIG. 2 is a block diagram of an alternative filter assembly according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of a filter circuit of an alternative filter assembly according to an embodiment of the utility model;
FIG. 4 is a schematic diagram of a filter circuit with an additional storage capacitor of an alternative filter assembly according to an embodiment of the present utility model;
FIG. 5 is a circuit diagram of an alternative filter assembly without filter circuitry according to an embodiment of the present utility model;
FIG. 6 is a circuit diagram of an optional filter assembly incorporating filtering circuitry according to an embodiment of the utility model;
FIG. 7 is a common mode filter circuit equivalent filter circuit of an alternative filter assembly according to an embodiment of the utility model;
fig. 8 is an equivalent filter circuit of a differential mode filter circuit of an alternative filter assembly according to an embodiment of the utility model.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
A filter assembly according to one embodiment of the present utility model, as shown in fig. 1, includes: a socket; the lightning protection circuit is connected with the socket and used for absorbing and discharging lightning energy led in through the socket; the filter circuit is connected with the lightning protection circuit, adopts a three-phase filter circuit with combined filtering of capacitance and inductance, adopts a common-mode inductance, six differential-mode capacitances, twelve common-mode capacitances, two diodes and two voltage-stabilizing diodes, is grounded through the voltage-stabilizing diodes, and is used for electromagnetic compatibility protection, and is provided with a filter component which comprises two energy storage capacitances; the lead wires are connected between the socket and the lightning protection circuit and between the lightning protection circuit and the filter circuit. The parameters and failure model of the diode are selected, and the formula is as follows: λp=λb pi E pi Q pi K. λb—basic failure rate: taking 0.236; pi E-environmental coefficient: 6, taking; pi Q-mass coefficient: taking 0.2; pi K-category coefficient: taking 1.0. The parameters and failure model of the diode are selected, and the formula is as follows: λp=λb pi E pi Q pi K pi C. λb—failure rate of operation: 0.0058 x 10-6/h; pi E-environmental coefficient: taking 10; pi Q-mass coefficient: taking 1; pi K-category coefficient: taking 1; pi C-structural coefficient: taking 1; parameters and failure models provided by GJB/Z299C are adopted, and the formula is as follows: λp=λb pi E pi Q pi P pi K pi C. λb—basic failure rate: 0.0096; pi E-environmental coefficient: 3.0; pi Q-mass coefficient: taking 0.2; pi P-contact coefficient: 9.5 is taken. Pi K-plug coefficient: taking 2.0. Pi C-jack structure coefficient: taking 0.3. Parameters and failure models provided by GJB/Z299C are adopted, and the formula is as follows: λp6=λbβpi Q. λb—basic failure rate: λb1 is 0.000092 x 10-6/h; pi E-environmental coefficient: 8, taking; pi Q-mass coefficient: taking 1; by predicting the reliability of the filter assembly, the reliability of the filter assembly is: 389651h. The filter solves the problem that the lightning protection component and the electromagnetic compatibility component are required to be additionally arranged at the same time in the prior art.
In particular, the housing of the filter assembly is made of aluminum alloy plate 6061. The filter adopts a shielding shell structure, and the shielding effectiveness definition (SE) is that the electric field shielding effectiveness SE E＝20lg(1/TE is equal to 20 lg|of the electric field before shielding/the electric field after shielding; magnetic shielding effectiveness SE H＝20lg(1/TH) =20 lg| magnetic field before shielding/magnetic field after shielding|; the better the conductivity and magnetic permeability of the material, the higher the shielding effectiveness, but the practical metallic material cannot achieve both aspects. Shielding action formula of the metal plate: se=a+r+b; a, absorption loss; r-reflection loss; and B, a multiple reflection correction factor. Absorption loss a=8.98 σt≡0.131sqr (fμ rσr); t-thickness of metal plate; f-electromagnetic wave frequency; mu r -magnetic permeability of metal material; σ r —conductivity of metal material. The product adopts the aluminum alloy structural design, and the shielding effect has a great relation with the conductivity of the aluminum alloy, and the conductivity of the aluminum is 3.82 multiplied by 10 7 s/m. The reflection loss calculation formula of the metal plate is simplified as follows: r=z W/4ZS r—reflection loss; z W -wave impedance of air; z S -wave impedance of the metal plate; the wave impedance of the aluminum plate is thus: z S＝3.82×107×sqr(f)×μr×σr is calculated by analysis: the electromagnetic wave absorption loss of the aluminum metal plate with the thickness of 0.5mm can reach 291dB for 30MHz, so the thickness of the shell of the filter is only required to be larger than 0.5 mm. The filter shell adopts an aluminum plate with the thickness of 1mm, the inside adopts a printed board assembly mode, components and parts are welded on the printed board, and finally the components and parts are fixed inside the metal shell through a fastener. The whole product structure adopts a processing mode of integral milling, so that the shielding effectiveness of the whole machine is greatly improved, the outward radiation of internal interference signals is greatly blocked, and meanwhile, the interference of external interference signals on the product can be effectively blocked. Because the top cover and the product shell belong to a hard connection mode between metals, the sealing electromagnetic effect can not be completely achieved, the top cover is inlaid and sealed by adopting a conductive rubber strip, and the electric connector is electromagnetically sealed by adopting conductive rubber. The connecting fastener of the filter component is made of stainless steel 1Cr18Ni9Ti material, and the inner surface of the outer cover is subjected to conductive oxidation treatment; all components are welded on the printed circuit board, and the printed circuit board is fixed on the shell by using screws, so that the vibration resistance, impact resistance and acceleration resistance are ensured; after the production of the printed board is finished, the surface is sprayed with insulating paint, so that the insulativity of the product is improved; smearing screw thread fastening glue on the screw thread before installing all screws; in order to ensure the vibration resistance, impact resistance and acceleration resistance, the product is encapsulated by using heat-conducting insulating glue after the installation is completed.
In specific implementation, the lightning protection circuit adopts a transient surge suppressor. The lightning damage effect is mainly formed by overlapping three modes of lightning surge electromagnetic induction, capacitive coupling and voltage drop of lightning pulse on structural members and ground wire resistors in a power supply, a signal and control circuit. In the lightning suppression voltage selection, the main type selection basis of the lightning protection circuit is as follows: firstly, when the lightning suppression voltage is selected to be low, in the normal operation of the product, the related executive function circuit in the subsequent product is caused to generate misoperation; if the product is in a lightning stroke voltage limiting state for a long time, the safety and reliability of the product are also reduced; secondly, when the lightning voltage limit is very high, the product can not reach the protection requirement of lightning performance, and the normal work of other products can be influenced. Aiming at the characteristics of lightning signals, different types of transient surge suppressors are selected to play a role in lightning protection.
Further, the transient surge suppressor is connected with the socket in parallel, and the main principle of lightning protection is that a lightning suppression circuit is connected between a signal and the ground of the shell in parallel. According to the characteristics of the protection product, the device which is easily damaged by lightning in the product is a relay, the other signal connection parts are motor coils or relay contacts, and according to the past design experience and test conditions, the lightning protection of the product can be realized by only protecting the rotation signal of the output shaft at the position of the base line. The coil corresponding to the relay is D, C ends, and products corresponding to other signals are not easy to be damaged by lightning, so that lightning protection is only carried out at D, C ends.
In the implementation, six differential mode capacitors are grouped in each three, and one end of each differential mode capacitor is electrically connected with each other and grounded. The parameters of the capacitor and the failure model are selected, and the formula is as follows: λp=λb pi E pi Q pi CV pi ch. λb—basic failure rate: taking 0.00285; pi E-environmental coefficient: taking 4.6; pi Q-mass coefficient: taking 0.3; pi CV-capacitance coefficient: taking 2.4; pi ch-surface mounting coefficient: taking 1.5.
In the filter assembly of the embodiment, the electric connector is connected with an aircraft cable, and as shown in fig. 2, the outgoing line of the filter is connected with a micro switch and a permanent magnet direct current motor in the device. The C, D needles in the filter assembly receive two paths of power supply, the control motor drives the output shaft to be turned off, mutual interference cannot be generated between the two paths of power supply, and the power supply ground is isolated from the signal ground. The lightning protection level of the filter component is 4, the schematic diagram of the filter circuit with the energy storage capacitor is shown in fig. 4, the lowest frequency of the power line conduction sensitivity test of the filter component is 0.02kHz, and the calculation formula between the capacitance value and the frequency of the energy storage capacitor required for filtering the interference is as follows: f 0＝1/(2πRS C), the lower the frequency to be filtered, the larger the capacitance of the capacitor, the lowest applied frequency is 10Hz according to the applied pulsation frequency, the resistance of the power line is approximately calculated by 0.2 omega, and the capacitance of the capacitor is as follows: 79618uF. a) At maximum disturbance applied to the power line, ripple Vp-p=4v, frequency: (1-15) kHz, wherein the rear stage load of the sliding lamp is an electric mechanism and the sliding lamp, and the sliding lamp is insensitive to the type of fluctuation and does not cause the abnormality of the electric mechanism and the sliding lamp, so that the filter can pass the test assessment without specially increasing the capacitance; b) Because the space and the weight of the filter are limited, a device with the withstand voltage value of more than 100V is required to be selected according to the power characteristic requirement, the function can be realized only by connecting a plurality of large-capacity capacitors in parallel, and the device can pass through the examination without special capacitor equipment.
The power supply mode of the equipment is a direct current power supply, and the direct current power supply is connected to other power supply circuits of the product after being subjected to filtering treatment through the filter component. The internal conduction interference of the product has both differential mode interference and common mode interference. Wherein the interference between 10kHz and 500kHz is mainly differential mode interference; the frequency is between 500kHz and 2MHz, and common mode interference and differential mode interference exist; the frequency is common mode interference between 2MHz and 10 MHz. The power supply has both differential mode interference and common mode interference, so that differential mode filtering is required to be carried out in the design of a filter circuit of the filter assembly, and common mode filtering is also considered. As shown in fig. 3, the differential mode filtering and the common mode filtering adopt a mode of combining capacitance and inductance, and because the filter component needs 4-level lightning protection, the lightning protection circuit occupies a larger volume, and the first-level common mode filtering inductance and the first-level differential mode inductance filtering mode circuit are finally adopted in consideration of the characteristics of different components and combined with the reserved space of the lightning protection circuit. Because most common mode interference frequencies are concentrated in the high frequency band, the lightning protection circuit is arranged at the front end of the filter input, and the high frequency common mode interference signals are filtered before being transmitted to the filter circuit, so that the problems that after the high frequency interference is filtered prematurely, the transmission and the emission of a product power line exceed the standard are avoided in a space coupling mode. Because other 28V signals exist in the product, more common-mode interference exists on the signal line, and therefore, the filtering of other signals adopts a common-mode capacitance mode for filtering. As shown in fig. 5, 6, 7, and 8, the insertion loss of the filter is: il=20 lg (U1/U2), where IL is the insertion loss, U1 is the output signal, and U2 is the input signal. Wherein ：U1'＝a11U2+a12I2,I1＝a21U2+a22I2,U1'＝U0-I1Rs,U2＝I2RL,U2＝U0/(a11+a12RL+a21Rs+a22RsRL), is taken into the insertion loss calculation formula to yield ：IL＝20lg|(a11 RL+a12+a21Rs RL+a22Rs)/(Rs+RL)|, wherein: a 11、a12、a21、a22 is a parameter of the filter network. The expression of the differential insertion loss ：ILCM＝10log((1-ω2LC)2+((ωL+(2ω2-ω3LC2)RL Rs)/RL+Rs)2); the expression of the common mode insertion loss ：ILGM＝10log((1-ω2LC/(1+Rs/RL))2+((ωL+(ωL+ωC RL Rs)/(RL+Rs))2). shows that the insertion loss is affected by the input terminal impedance Rs and the load impedance RL according to the formulas of the common mode insertion loss and the differential insertion loss. The functional relationship between the input impedance Rs and the load impedance RL can be seen as follows ：f(Rs、RL)＝((RLω2LC2)+(ωL)2)/((Rs+RL)2).: ILGM reaches a minimum when f (Rs, RL) takes a minimum. When RL is unchanged and Rs takes the maximum value, f (Rs, RL) becomes the minimum value. Rs, RL and cut-off frequency are therefore critical in performing insertion loss calculations. According to the technical requirement, the load current is 6A, the input impedance Rs is approximately 2 omega according to the cutoff frequency of 100kHz, the insertion loss is calculated, and meanwhile, the inductance and capacitance parameters in electromagnetic compatibility protection are approximately calculated.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. A filter assembly, comprising:
A socket;
The lightning protection circuit is connected with the socket and is used for absorbing and discharging lightning energy led in through the socket;
The filter circuit is connected with the lightning protection circuit, the filter circuit adopts a three-phase filter circuit with combined filtering of capacitance and inductance, the filter circuit adopts a common-mode inductance, six differential-mode capacitances, twelve common-mode capacitances, two diodes and two voltage-stabilizing diodes, the filter circuit is grounded through the voltage-stabilizing diodes, the filter circuit is used for electromagnetic compatibility protection, the filter circuit is provided with a filter assembly, and the filter assembly comprises two energy-storing capacitances;
And the socket is connected with the lightning protection circuit and the lightning protection circuit is connected with the filter circuit through the lead.
2. The filter assembly of claim 1, wherein the filter assembly is configured to filter the filter signal,
The housing of the filter assembly is made of aluminum alloy plate 6061.
3. The filter assembly of claim 1, wherein the filter assembly is configured to filter the filter signal,
The lightning protection circuit adopts a transient surge suppressor.
4. The filter assembly of claim 3, wherein the filter assembly,
The transient surge suppressor is connected in parallel with the socket.
5. The filter assembly of claim 4, wherein the filter assembly is configured to filter the filter signal,
And one end of each group of differential mode capacitors is electrically connected with each other and grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322888210.6U CN220935149U (en) | 2023-10-27 | 2023-10-27 | Filter assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322888210.6U CN220935149U (en) | 2023-10-27 | 2023-10-27 | Filter assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220935149U true CN220935149U (en) | 2024-05-10 |
Family
ID=90969403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322888210.6U Active CN220935149U (en) | 2023-10-27 | 2023-10-27 | Filter assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220935149U (en) |
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2023
- 2023-10-27 CN CN202322888210.6U patent/CN220935149U/en active Active
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