CN202444145U - Wideband anti-carrier divulgence safety power socket - Google Patents
Wideband anti-carrier divulgence safety power socket Download PDFInfo
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- CN202444145U CN202444145U CN2011204210918U CN201120421091U CN202444145U CN 202444145 U CN202444145 U CN 202444145U CN 2011204210918 U CN2011204210918 U CN 2011204210918U CN 201120421091 U CN201120421091 U CN 201120421091U CN 202444145 U CN202444145 U CN 202444145U
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Abstract
The utility model relates to a wideband anti-carrier divulgence safety power socket which includes an overload protective part used for guaranteeing the safe use of the power socket, power jacks used for being inserted with power plugs, an electromagnetic filter, and an electromagnetic shielding part, wherein the electromagnetic filter is packaged in the electromagnetic shielding part, and input and output terminals of the electromagnetic filter are led out of a housing of the electromagnetic shielding part via pins to connect with the overload protective part, a zero wire, a ground wire, and the power jacks. The safety socket can effectively improve the safety of the office environment and an electronic information system, and can prevent the divulgence caused by the electromagnetic radiation and the power line carrier.
Description
Technical field
The utility model relates to the supply socket field, relates to the anti-carrier wave of a kind of wideband safety power source plug socket of divulging a secret particularly.
Background technology
Current, in concerning security matters Administrative Area and the operational environment, the common power module that is widely used, wiring board realize that the power supply of computer, communication equipment and the network equipment inserts, and this kind equipment is not taked anti-information leakage safety measures such as shielding, filtering.Obtain the fast development of technology along with power line carrier technology, electromagnetic radiation signal; The emerging technology of stealing secret information emerges in an endless stream; The potential safety hazard that common power module, wiring board in use exist becomes increasingly conspicuous; The product that meets existing electromagnetic leakage emanation security standard also is difficult to tackle the potential safety hazard that new technology is brought, and can not imitate the prevention broadband power line communication entirely.Subject matter comprises following 4 points:
First is that the common power module can not be resisted the power line carrier means of stealing secret information.Power line communication (PLC; Power Line Communication) be to utilize power line to carry out the communication mode of high speed data transfer; In recent years along with the application of orthogonal frequency division multiplexi OFDM (Orthogonal Frequency Division Multiplexing) in the power line communication field; The PLC chip technology is obtained important breakthrough; Power line communication technology and equipment development speed are obviously accelerated, and the transmission digit rate on low-voltage network (below the 10kV) has developed into the speed of 2Mbps, 14Mbps, 24Mbps, 45Mbps, 100Mbps and 200Mbps, and transmission range can reach 300 meters; Formed the miniaturization based on power line, microminiaturized transmission equipment, the technology of stealing secret information accordingly also will be arisen at the historic moment.Experiment shows, can obtain all files information of object-computer storage based on the technology of stealing secret information of power line carrier.
Second is that the common power module can not prevent that the power line radiation from divulging a secret.In the electronic information; The high-frequency signal (information) that equipment such as computer, server, switch produce can leak through wireless radiation or wired conduction; Radiation proof computer that the part unit that security requirements is higher adopted and shielding machine room can effectively be defendd the electromagnetic radiation of wireless approach; And wired conduction is leaked and can be conducted at certain distance through power line; Power cable is designed to 50Hz or 60Hz low-loss power transmission application, carries out wired conduction but the signal between 1MHz～40MHz frequency that computer equipment produces can be carried on power line, and power cable has leakage in the conductive process; There is bigger potential safety hazard in part high-frequency signal power with the radiation of electromagnetic wave form, and power line radiation concerning security matters problem needs to be resolved hurrily.
Thirdly be that the common power module can not satisfy country and the secret standard-required of army.Stipulate that clearly when requiring classified information equipment to install and use, red electric power loop should be supplied power separately with the black appliances resource loop among the national secret standard BMB5-2000 that National Administration for the Protection of State Secrets formulates " classified information equipment uses on-the-spot electromagnetic leakage emanation security to require "; If condition is limited, can not supply power separately, must take the filtering quarantine measures between then red electric power loop and the black appliances resource loop.GJB GJB 151A-97 " military equipment and subsystem electromagnetic emission and susceptibility require " also explicitly calls for electromagnetic emission, and its method of testing is pressed GJB 152A-97 " military equipment and subsystem electromagnetic emission and susceptibility are measured ".
Under the present case, address the above problem, adoptable way mainly is: independently-powered, the red equipment of red-black equipment installs power-supply filter additional.Wherein, the independently-powered place environmental limitations that receives of red-black equipment, existing electric power system is transformed difficulty, cost is high, and it is difficult that red-black equipment is judged; The solution that red equipment installs power-supply filter additional mainly contains two; Be respectively to install UPS additional, install special filter additional; The former cost is high, is difficult to extensive enforcement, and latter's cost is low, flexible configuration, do not receive that place environmental limitations, portability use, good wave filtering effect.To sum up, the demand of current power source special filter to National standard and military standard is very urgent.
The 4th is can not imitate the prevention broadband power line communication entirely according to the safety power supply module of current standard development and production.At present, being engaged in the manufacturer that PLC research and development make in the world has last hundred families, and all there are Related product or implementation in electric power company of family surplus more than 50 many family and regional 300 in the world.Along with the development of PLC technology, its carrier frequency significantly promotes, and can be divided into arrowband PLC (NB-PLC) and broadband P LC (BB-PLC) at present, and arrowband PLC is the PLC of traditional indication, and broadband P LC reference carrier frequency can be 1MHz～40MHz.But; Because PLC is new technology and the band occupancy broad that telecommunications and power supply unite two into one; Definition in the existing EMC standard, method of testing, index regulation are all considered respectively by telecommunications and power supply; The technical standard of conventional P LC also all is to be directed against arrowband PLC, and therefore existing EMC standard is difficult to Validity Test, defines and limits broadband P LC The Application of Technology.
In the current standard; The 1.5MHz～30MHz that is defined as to electromagnetic leakage emanation security scope; Existing product all designs production by this requirement; This type of power-supply filter only can be operated in 220V ± 5V voltage range, and isolation (insertion loss) is greater than 50dB, and effectively isolating frequency range is 1.5MHz-30MHz.For less than 1.5MHz and lower, do not have the effect of effective filtering greater than the insertion loss of 30MHz signal.In sum, the power-supply filter of current standard development can not effectively be resisted the power line carrier communication of 1MHz～1.5MHz and 30MHz～40MHz, is necessary very much to carry out specific aim research.Simultaneously, along with the development of power line carrier, PLC technology and weak signal analytical technology, the isolation of 50dB has much room for improvement.
The utility model content
In order to overcome above-mentioned deficiency of the prior art, the utility model provides the anti-power line carrier of a kind of wideband safety power source plug socket of divulging a secret.Through installation em filtering device in power supply wiring board or socket, thus the secure communication of assurance broadband power line.
The safety power source plug socket of the utility model comprises: the overload protection parts are used to guarantee the safe handling of supply socket; Supply hub is used to insert attaching plug; Em filtering device and electromagnetic shielding component; Wherein the em filtering device is encapsulated in the electromagnetic shielding component; Each input/output terminal of em filtering device is drawn from the shell of electromagnetic shielding component through the mode of pin, is connected with overload protection parts, zero line, ground wire and supply hub.
Said safety power source plug socket in the course of the work, live wire at first connects the overload protection parts, inserts the em filtering device through electromagnetic shielding component again, connects supply hub through electromagnetic shielding component more at last.
Said em filtering device suppresses circuit unit by common mode disturbances and DM EMI inhibition circuit unit is formed.
The input L of said em filtering device, N and E pin are connected live wire, zero line and the ground wire of external ac power source respectively, and output weld tabs L1 and N1 are that the live wire and the zero line pin of stable AC power supply are more exported in load.
The front and back shielded metal shell of said electromagnetic shielding component is made up of two steel plates of crossing through copper facing, Nickel Plating Treatment, plays shielding, anticorrosion and environment protecting.
Said electromagnetic shielding component and em filtering device comprise step in manufacturing process: the shell of opening electromagnetic shielding component; Inwall is placed the high-temperature insulation plastic film; Place the filter circuit components and parts that welded; Adopt casting glue to inject in the housing, to flooding more than the components and parts certain depth; Use the Pb-free solder welded case, make its seamless link; With supporting screw and nut, through the lower panel of socket panel and four via holes of shield member shell, the shield member that will be packaged with filter is fixed on the wiring board outer casing inner wall; External power cord is passed socket introduce the hole, its live wire, zero line and ground wire are welded on respectively on L, N and the E weld tabs of the shell of shield member, the L1 of filter and N1 and E are welded on the inside shell fragment of socket; Cover socket panel, fix with supporting screw.
Through using the above-mentioned safety power source plug socket of the utility model; Utilize electromagnetic interference (Electromagnetic Interference; EMI) filtering technique, insertion loss control technology, electromangnetic spectrum, integrated design technology; Development meets country, military standard, is fit to the safety power supply module that concerning security matters department uses, and can be used for safe wiring board and body of wall flush plug consent; Can effectively promote working environment and the safe and secret ability of electronic information, the problem of divulging a secret that strick precaution electromagnetic radiation, power line carrier cause.
Description of drawings
Figure 1A is the profile reference diagram of the common wiring board of prior art;
Figure 1B is the divulge a secret profile reference diagram of safety power supply wiring board of the anti-power line carrier of the wideband of the utility model;
Fig. 2 is the divulge a secret structured flowchart of safety socket of the anti-power line carrier of the wideband of the utility model;
Fig. 3 is electromagnetic shielding component 203 shell sketch mapes in the utility model supply socket;
Fig. 4 and Fig. 5 are the internal circuit design figure of em filtering device parts;
Fig. 6 is the common mode choke circuit diagram of own centre line;
Fig. 7 is the typical response curve of the common mode choke of own centre line.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to the utility model further explain.
The anti-carrier wave of the wideband that the utility model the proposes safety power source plug socket of divulging a secret has mainly been considered following two aspects: the firstth, resisting aspect power line carrier steals secret information.In the technology of power line carrier communication realizes; Because power line is the transmission channel of strong noise, overdamp; Realize reliable high speed power line communication; The various factorss such as signal attenuation that online noise, impedance fluctuations, Electro Magnetic Compatibility, line impedance and the capacitive load of need reasonable disposal low-voltage distribution causes are to the influence of transfer of data, and its frequency range is 1MHz～40MHz, and the transmission data bandwidth is 2Mbps～200Mbps.For eliminating the power line carrier communication in the power line application of concerning security matters department; Need in the frequency range of 1MHz～40MHz, to utilize technology such as filtering, coupling; The power line carrying signal is carried out effective attenuation processing; Its signal attenuation value is risen to more than the 60dB, can effectively stop signal interception and reduction.
Second aspect is to prevent that the power line radiation from divulging a secret, satisfying aspect the secret standard-required.The power module that development is used, wiring board need strict its electromagnetic leakage emissivities of control; Should meet national secret standard BMB5-2000 " classified information equipment uses on-the-spot electromagnetic leakage emanation security to require " requirement; And satisfying the requirement of GJB151A-97 " military equipment and subsystem electromagnetic emission and susceptibility require " to electromagnetic emission, method of testing satisfies the requirement of GJB152A-97 " military equipment and subsystem electromagnetic emission and susceptibility are measured ".Simultaneously; Because the electromagnetic leakage emanation security scope 1.5MHz～30MHz that defines in current country and the army's relevant criterion can not satisfy 1MHz～40MHz new demand; And the standard of inserting loss 50dB also can't adapt to the actual user demand of some environment; Therefore, the selecting for use etc. of optimal design that need be through rationally the choosing of filter and components and parts, filter construction and multiple electromagnetic interference shielding strategy makes divulge a secret each item index of power module of anti-carrier wave reach the higher standard requirement; Filter range covers 1MHz～40MHz, inserts loss and is not less than 60dB.
The utility model utilizes electromagnetic interference (Electromagnetic Interference; EMI) filtering technique, insertion loss control technology, electromangnetic spectrum, integrated design technology; Development meets country, military standard; Be fit to the safety power supply module that concerning security matters department uses (referring to the safe wiring board that the back is mentioned and the general designation of body of wall flush plug consent); Can be used for safe wiring board and body of wall flush plug consent, can effectively promote working environment and the safe and secret ability of electronic information, the problem of divulging a secret that strick precaution electromagnetic radiation, power line carrier cause.
In order to realize above-mentioned requirements; The divulge a secret realization of safety power source plug socket of the anti-carrier wave of the wideband of the utility model mainly is through existing wiring board or socket (being fixed on the wall usually) are improved; Add an em filtering device therein, thereby realize the problem of divulging a secret that strick precaution electromagnetic radiation, power line carrier cause.
Figure 1A is the profile reference diagram of the common wiring board of prior art.Figure B is the divulge a secret profile reference diagram of safety power supply wiring board of the anti-power line carrier of wideband of the utility model.The safety power source plug socket of the utility model is from profile or all is that existing supply socket is improved on the structure internally.With reference to Fig. 1; At first from profile, the wiring board that the safety power supply wiring board of the utility model is compared prior art has increased small panel 101, and this small panel preferably adopts PC to gather the carbon material; The sheathing material of wiring board preferably adopts fire-resistant engineering plastics; In order to make conductivity better, control switch 102 preferably adopts the silver-cadmium alloy contacts, and preferably adopts shielded cable.The inside of small panel 101 is equipped with em filtering device and electromagnetic shielding component.
Fig. 1 only illustration the outline drawing of socket of the utility model, the safety power source plug socket of the utility model comprises the power supply wiring board of any model with one or more supply hubs or is installed in the socket on the wall.Supply hub can be a twin jack, also can be three jacks.
Fig. 2 is the divulge a secret structured flowchart of safety socket of the anti-power line carrier of the wideband of the utility model.
See figures.1.and.2, the supply socket of divulging a secret of the anti-carrier wave of the wideband of the utility model comprises: current-controlled switch 201, and corresponding to the positive shift knob 101 of the wiring board among Fig. 1, the current flowing that is used to control supply socket is whether; Overload protection parts 202, the overload protection button corresponding to wiring board side among Fig. 1 is used to guarantee the safe handling of supply socket; Electromagnetic shielding component 203 and em filtering device 204 are installed among Fig. 1 in the small panel between the shift knob and plug wire hole, are the core places of the utility model, will combine Fig. 3 to Fig. 5 to be elaborated below; Supply hub 205 is used to insert plug; Outer structural element 206 mainly comprises the shell of socket.
Wherein em filtering device 204 is encapsulated in the electromagnetic shielding component 203; Each input/output terminal of em filtering device 204 is drawn from the shell of electromagnetic shielding component 204 through the mode of pin; Be connected with the corresponding component of supply socket, just be connected with overload protection parts, zero line, ground wire and supply hub 205 through pin.
Safety power source plug socket in the course of the work; Live wire at first connects current-controlled switch 201 and overload protection parts 202; Insert em filtering device 204 through electromagnetic shielding component 203 again; Wherein, em filtering device 204 is made up of the filter components and parts, connects supply hub 205 through electromagnetic shielding component 204 at last.
Current-controlled switch 201 and overload protection parts 202 utilization overload adaptive techniques, the safe operation and the On/Off controlled function of realization supply socket and filter improve flexibility and fail safe that power module uses.
Outer structural element is according to the divulge a secret actual demand of application of power environment of anti-carrier wave; Choose appropriate sheathing material and shielded cable etc.; And take all factors into consideration the size and the performance of power module; Satisfy designing requirement attractive in appearance, generous, that be suitable for, realize the external structure design of anti-power line carrier wiring board and body of wall flush plug consent two power module.
Fig. 3 is electromagnetic shielding component 203 shell sketch mapes in the utility model supply socket.
With reference to Fig. 3, the input L of em filtering device 204, N and E pin are connected live wire, zero line and the ground wire of external ac power source respectively, and output weld tabs L1 and N1 are that the live wire and the zero line pin of stable AC power supply are more exported in load.The front and back shielded metal shell 301 of electromagnetic shielding component 203 is made up of two steel plates of crossing through copper facing, Nickel Plating Treatment, plays shielding, anticorrosion and environment protecting.The side casings 302 of electromagnetic shielding component 203 is the two ends fixing threaded hole 304 (the 304th, the electromagnetic shielding component two ends are fixed on screw required on the wiring board) that comprises side pin welding hole 303 (L, N, L1, these pins of N1 all are to be welded on the corresponding side welding hole) and electromagnetic shielding component 203.The each several part size is as shown in Figure 3, and packaged shell is long, and wide size is respectively 64.0mm, 51.6mm; Thickness is 29.0mm; Distance between the fixing threaded hole center, two ends is 75.0mm; Distance between the fixing threaded hole outward flange of two ends is 84.0mm; Distance between the outer end points of both sides welding pin is 95.0mm.(the size basic fixed that is used for wiring board, suitable adjustment is done in also visual special requirement.)
Fig. 4 and Fig. 5 are the internal circuit design figure of em filtering device parts.Fig. 4 is a bipolar power supply filter circuit schematic diagram, and Fig. 5 is the power-supply filter circuit structure diagram of the utility model, and is as shown in the figure, and shell E weld tabs directly is welded on em filtering device metal shell outer wall; The pin that links to each other with shell L, N weld tabs welds the two ends of resistance R respectively; The R two ends are parallelly connected with differential mode capacitor device Cx1 two ends again; The Cx1 two ends are connected two coil L1 of a common mode filtering inductor and the end of L2 respectively more separately; Wherein, each comfortable FERRITE CORE Z1 of L1 and L2 coil goes up and twines 8 circle composition common mode filtering inductors; The other end of L1 and L2 is welded on the two ends of differential mode capacitor device Cx2 more respectively; The two ends of Cx2 are welded a common mode capacitance device Cy1 and Cy2 respectively; The other end of Cy1 and Cy2 all is welded on ground connection on the inwall of em filtering device metal shell; The two ends of Cx2 also will connect two coil L3 of another common mode filtering inductor and the end of L4 respectively; Wherein, each comfortable FERRITE CORE Z2 of L3 and L4 coil goes up and twines 8 circle composition common mode filtering inductors; The other end of L3 and L4 is welded on the two ends of differential mode capacitor device Cx3 respectively; The Cx3 two ends be welded on respectively with shell L1 and pin that the N1 weld tabs links to each other on.
With reference to Fig. 4, this bipolar power supply filter is a passive device, mainly is made up of safety electric capacity and inductance, constitutes the low pass filter of low-leakage current, high pressure resistant, high insulation resistance and high Insertion Loss.Cx, Cy electric capacity all is safety electric capacity, and between Live line Zero line is Cx electric capacity, and between live wire and ground is Cx electric capacity.They are used in the power-supply filter, play the power filter effect, respectively common mode, DM EMI are strobed.Safety electric capacity is meant and is used for such occasion, after promptly capacitor lost efficacy, can not cause electric shock, does not jeopardize personal safety.
(Fig. 4 is circuit theory diagrams to Fig. 5, and Fig. 5 has done the improved side circuit design drawing of appropriate adjustment according to the actual design needs, does not have essential distinction, and just the circuit link position has taken place a bit to change.) shell 301 in the empty frame corresponding diagram 3, and Cy one end will be welded on the metal-back inwall.
Anti-carrier wave divulges a secret that supply socket mainly comprises em filtering device, electromagnetic shielding component, shielded power supply line plug, can recover overcurrent protector (10A), international general-purpose 10A jack, double-break switch, resistance and light-emitting diode and bottom.
In the circuit design process of the em filtering device of the utility model, be very important to choosing of inductor and capacitor.In the selection of filter inductance,, adopt ferrite cored coil in order under smaller volume, to obtain bigger inductance value.Wherein, the common mode anti-interference filter adopts common mode choke.Select for use the magnetic material-MnZn ferrite that has than high initial magnetoconductivity to do the common mode filtering inductance; The differential mode filter inductive material adopts composite magnetic powder core; This is present optimal filter inductance material; Soon the soft magnetic metal powder forms through insulation parcel compacting annealing, is equivalent to be dispersed into small hole to a concentrated air gap and is evenly distributed in the magnetic core, and not only the anti-saturation intensity of material increases; And the resistivity of magnetic core has changed the shortcoming that metallicl magnetic material can not use than the original several magnitude that increases under high frequency.
Choosing in the process of capacitor, different with general capacitor, the capacitor in the EMI filter network is divided into two types of Cx and Cy.Wherein Cx is connected between phase line and the center line, is called differential mode capacitor; Cy is connected between phase line or center line and the ground wire, is called common mode capacitance.When selecting filter for use, the necessary strict security performance of considering Cx and two types of capacitors of Cy is because they are directly connected to the security performance of filter.
Though the lumped-parameter element filter is mainly used in low-frequency range, its frequency also can reach 1GHz.In order better to guarantee its performance, the utility model is selected the device of safety electric capacity as the filter circuit two ends for use.Safety electric capacity is reeled by metallic film and is formed, and one of them dististyle and center conductive copper rod weld together, and another dististyle and capacitor case weld together as earth terminal.
In addition, in order to reduce electromagnetic interference, shown in Fig. 6 and 7, on circuit design, PCB routing, reduce electromagnetic interference and on shell, increase methods such as shielding, the common mode choke that adopts own centre line, ground connection to reduce electromagnetic interference.Fig. 6 is the common mode choke circuit diagram of own centre line, and Fig. 7 is the typical response curve of the common mode choke of own centre line.
According to the basic principle of electromagnetic shielding, low frequency magnetic field is because its frequency is low, and absorption loss is very little, and kelvin effect is very little, and owing to its wave impedance is very low, reflection loss is also very little, therefore merely by reflecting and absorb the shield effectiveness that very difficult acquisition needs.To this low frequency magnetic field, we provide a very low bypass of magnetic resistance to realize shielding through using high permeability materials as magnetic field, and the magnetic field in space just is concentrated in the shielding material like this, thereby makes magnetosensitive device avoid magnetic interference.High permeability materials can greatly lose magnetic under the impact of machinery, cause screening effectiveness to descend.Therefore, shield must be through Overheating Treatment to recover magnetic after through machining (like bending, weld, knock, boring etc.).Heat treatment will be carried out under given conditions, generally will in the dry hydrogen steam stove, be heated to 1177 ℃ with certain speed, keeps 4 hours, is reduced to room temperature with certain speed then.
When the assembly junction was welded, we adopted the shielding material masterbatch to do the welding inserts, can guarantee the high permeability of commissure like this.If it is lower that screening effectiveness requires, also can adopt the mode of riveted joint or spot welding to fix, but that the shielding material that will note jointing positions will have is certain overlapping, to guarantee less magnetic resistance on the magnetic circuit.
When the magnetic field of needs shielding is very strong, only use the single-layer shield material, do not reach shielding requirements.At this moment, a kind of method is the thickness that increases material.But more efficient methods is to use the combination shielding, and a shield is placed in another shield, leaves air gap between them.Can fill any non-magnet material (like aluminium) in the air gap and do support.The shield effectiveness of combination shielding is more much higher than single shield, and therefore the combination shielding can be with field decay to very low degree, and what the utility model adopted promptly is the method for combination shielding.
Suitable line filter is set on the power supply input-output line can effectively be suppressed the conduction emission and improve conducted susceptibility.When selection and installation filter, should follow following principle: filter must well shield, and shield and power supply well overlap.Input filter should be contained in the place, input port, and output filter should be contained in equipped at outlet port, and away from the very strong transformer of internal electromagnetic emission, inductor, power switch etc.If the words of conditions permit rationally are connected with power supply as an individual components as far as possible.The input of filter, output line can not intersect, and should adopt shielding conductor or screen is set each other.The element that filter is inner self will carry out the processing of good electromagnetic shielding and ground connection, causes electromagnetic radiations emission in order to avoid flow through the short circuit current of filter earth lead.The iron core of filter inductance preferably adopts jar type or ring-like, if can add short-circuited conducting sleeve or magnetic screen with other shapes.Coil adopts individual layer or segmented winding, can adopt the lattice coil of honeycomb coiling during little electric current.Grip altogether inductance can not take two-wire and around, should be the symmetry 2 absolute coils.Filter capacitor should select the good capacitor of high frequency characteristics.
Ground connection is that the basic fundamental of circuit or system's ability operate as normal one of requires.Appropriate earthing mode can form low impedance path to high-frequency interferencing signal.Here the ground connection of indication mainly is signal ground, and its objective is to signal level provides a zero potential reference point.The casing of equipment is linked to each other with the earth, makes it the zero potential that keeps real, this to the job stability that keeps equipment with prevent that electromagnetic interference from playing an important role.
Signal ground is meant the ground wire of signal circuit or the ground wire of signal code circulation is arranged.In actual measurement, adopt the signal ground earthing mode of ground line parallel one point earth; Each equipment is kept apart; The loop current that prevents a grounding system influences other grounding system, the more important thing is to a good current path is provided between signal source and the receiver.The good earth of electromagnetic interface filter, extremely important to the common mode inhibition capacity that keeps electromagnetic interface filter.Simultaneously also should avoid the use of long earth connection,, reduce the common mode inhibition capacity of filter because it can cause ground connection inductance and resistance.
Filter package is extremely important to the overall performance of realizing electromagnetic interface filter.Especially the layout of device, lead-in wire control waits and seems particularly important.The electromagnetic interface filter of function admirable, its physical layout should be longilineal.
In filter element configuration and encapsulation process, should be noted that: in big current filter, inductance coil is separated by electric capacity.Do like this and can reduce magnetic field between coil and open and disturb through increasing distance between each inductor.If input, output have to be positioned at the homonymy of filter, then must in the whole filter body, will import (interference range) and isolate as much as possible, the high frequency attenuation influence that should use the independent encapsulating shell of electric capacity to cause to reduce the electric capacity lead-in wire with output (interference-free coverage area).Power-supply filter must encapsulate with the shielded metal shell; Otherwise can't reach the Insertion Loss performance of expection, and package casing must process with good conductor, select for use cold-rolled steel as encapsulating material; And in its electroplate or chromium plating to improve its conductivity, play excellent shielding effect; Simultaneously, the package casing that has only good conductor to process just can make safety electric capacity play a role, thereby reduces the high frequency effect that goes between to greatest extent.Shell is inboard to be placed 6520 compound fish papers (by polyester film single spreading stick, and the double-layer composite material that forms of album leave cardboard) and makes slot liner, and insulation progression: A level (105 ℃) has higher mechanical strength and dielectric property.
The inner heat conductive flame-retarding type epoxy pouring sealant that adopts of power-supply filter is filled, and is used for fixing device, and solder joint comes off when preventing to shake; Flame retardant rating reaches the UL94-V0 level; Viscosity is low, good fluidity, penetrate in the gap of product easily, but normal temperature or intermediate temperature setting, solidify the no bubble in back, surfacing, glossy, hardness is high; The solidfied material acid-proof alkaline is good; The grease proofing anti-dust performance of moistureproof and waterproof is good, and moisture-proof heat and atmospheric aging, solidfied material have electric and physical characteristics such as good insulation performance, resistance to compression, adhesive strength height.
Claims (5)
1. the anti-carrier wave of the wideband safety power source plug socket of divulging a secret comprises:
The overload protection parts are used to guarantee the safe handling of supply socket;
Supply hub is used to insert attaching plug;
It is characterized in that; Further comprise em filtering device and electromagnetic shielding component; Wherein the em filtering device is encapsulated in the electromagnetic shielding component; Each input/output terminal of em filtering device is drawn from the shell of electromagnetic shielding component through the mode of pin, is connected with overload protection parts, zero line, ground wire and supply hub.
2. the anti-carrier wave of the wideband as claimed in claim 1 safety power source plug socket of divulging a secret is characterized in that,
Said safety power source plug socket in the course of the work, live wire at first connects the overload protection parts, inserts the em filtering device through electromagnetic shielding component again, connects supply hub through electromagnetic shielding component more at last.
3. the anti-carrier wave of the wideband as claimed in claim 2 safety power source plug socket of divulging a secret is characterized in that said em filtering device suppresses circuit unit by common mode disturbances and forms with DM EMI inhibition circuit unit.
4. the anti-carrier wave of the wideband as claimed in claim 3 safety power source plug socket of divulging a secret; It is characterized in that; The input L of em filtering device, N and E pin are connected live wire, zero line and the ground wire of external ac power source respectively, and output weld tabs L1 and N1 are that the live wire and the zero line pin of stable AC power supply are more exported in load.
5. the anti-carrier wave of the wideband as claimed in claim 4 safety power source plug socket of divulging a secret is characterized in that the front and back shielded metal shell of electromagnetic shielding component is made up of two steel plates of crossing through copper facing, Nickel Plating Treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204210918U CN202444145U (en) | 2011-10-28 | 2011-10-28 | Wideband anti-carrier divulgence safety power socket |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204210918U CN202444145U (en) | 2011-10-28 | 2011-10-28 | Wideband anti-carrier divulgence safety power socket |
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| CN202444145U true CN202444145U (en) | 2012-09-19 |
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| CN2011204210918U Expired - Lifetime CN202444145U (en) | 2011-10-28 | 2011-10-28 | Wideband anti-carrier divulgence safety power socket |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102509971A (en) * | 2011-10-28 | 2012-06-20 | 中国人民解放军总参谋部第五十五研究所 | Broadband carrier-leak-proof safety power supply socket |
| CN104242991A (en) * | 2014-08-29 | 2014-12-24 | 戴葵 | Ultra-wide-band power line carrier communication blocker structure |
| CN110784484A (en) * | 2019-11-06 | 2020-02-11 | 北京计算机技术及应用研究所 | Filtering device with carrier monitoring function |
| CN112748681A (en) * | 2020-11-26 | 2021-05-04 | 浙江捷昌线性驱动科技股份有限公司 | Motor control system and lift table based on power line carrier communication |
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2011
- 2011-10-28 CN CN2011204210918U patent/CN202444145U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102509971A (en) * | 2011-10-28 | 2012-06-20 | 中国人民解放军总参谋部第五十五研究所 | Broadband carrier-leak-proof safety power supply socket |
| CN102509971B (en) * | 2011-10-28 | 2015-04-15 | 中国人民解放军总参谋部第五十五研究所 | Broadband carrier-leak-proof safety power supply socket |
| CN104242991A (en) * | 2014-08-29 | 2014-12-24 | 戴葵 | Ultra-wide-band power line carrier communication blocker structure |
| CN110784484A (en) * | 2019-11-06 | 2020-02-11 | 北京计算机技术及应用研究所 | Filtering device with carrier monitoring function |
| CN112748681A (en) * | 2020-11-26 | 2021-05-04 | 浙江捷昌线性驱动科技股份有限公司 | Motor control system and lift table based on power line carrier communication |
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Granted publication date: 20120919 |
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| CX01 | Expiry of patent term |