CN103812106A - Anti-electromagnetic interference method of aerial AC (alternate current) power source system - Google Patents
Anti-electromagnetic interference method of aerial AC (alternate current) power source system Download PDFInfo
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Abstract
The invention discloses an anti-electromagnetic interference method of an aerial AC power source system. According to the method, the reference end of a first-stage comparator of a voltage regulating circuit is provided with a filter capacitor, and another filter capacitor is arranged between the positive input pin interface and the negative input pin interface of a comparator of a frequency sampling circuit; a filter is mounted between an internal filter capacitor of an AC generator controller and an exciting voltage obtained through full-bridge rectification; filters are mounted on four communication cables of difference receiving input and difference transmitting output of an internal RS422 (A) of the AC generator controller; a filter is mounted behind an internal input/output electric coupler of the AC generator controller and before a relay connected with a tri-phase transformer and a permanent magnetic motor. Every filter can meet the corresponding insertion loss requirements. When products are tested through the anti-electromagnetic interference method, the voltage can fundamentally maintain stable without swinging, frequency protection and over-voltage or under-voltage protection due to interference can be avoided, therefore, the reliability of the products can be improved, and the power source system can meet the electromagnetic compatibility sensitivity requirements complying with the relevant national standards.
Description
Technical field
The invention belongs to aviation power system technical field, be specially the method for the anti-electromagnetic interference of a kind of aviation AC power supply system.
Background technology
Aviation power system is that aircraft ensures flight safety, completes one of main power source of predict task.The power-supply system of existing aircraft, in various ground experiments and flight course, is affected by the instantaneous not clear electromagnetic interference signal that may exist often, has exceeded system ability to bear and produced to protect fault by mistake.Particularly ought there is in-flight protecting fault by mistake, cause aircraft to occur aerial circut breaking, gently affect aerial mission and complete, heavy jeopardize flight safety.Main power source system on machine is responsible for providing 115V/200V400Hz constant frequency AC to electrical network on machine, for most power consumption equipments on machine.And its power supply quality, especially electricity generation system electric field transmitted level affect system self normally to work first, also have a strong impact on power consumption equipment and normally work.
At present, it is universal phenomenon that the main flow Aircraft Main power-supply system electric field transmitted multiband of several extensive uses significantly exceeds standard, and causes and protect phenomenon many by mistake in line using, causes aircraft power system outfield Frequent Accidents, and product returns factory and leads higher.Indivedual types have occurred causing aircraft electronic compass malfunctioning because power-supply system transmitting exceeds standard, the phenomenon of cannot normally working.When reason is that each type power-supply system was developed originally, technical protocol requires not tight, and on aircraft, electronic equipment does not have so muchly in addition, and environment for use is relatively simple, thereby electric field transmitted requires not concrete.System does not also detect separately, even if detect defectively, is all generally to drive to check with whole aircraft floor to be as the criterion, and requires subsystems can normally start, work, and is independent of each other as principle.Once have this type of fault, each subsystem all goes to search separately reason, and the result of searching can normally be worked with each subsystem ground often.
New aviation power system EMC Requirements is to carry out by new EMC Standard requirement at present.Existing aviation power system usually occurs in the time detecting by new standard: output voltage swings continually by a relatively large margin, until overvoltage protection stops generating; Over frequency protection, system cut-off.For solving poor anti jamming capability that this AC power supply system ubiquity and the electromagnetic emission problem that exceeds standard, technical staff's the thinking of researching and solving concentrates on and in alternating current power-generating system, installs the filter specially grinding additional and carry out filtering interfering at present.This solution thinking is the filter product that will increase special development in new aviation power system, or install additional outward and specially grind filter in the defeated entry/exit port of one of system building block alternator controller, so just change the state such as building block or product structure, weight of aviation power system, need again coordinate with main frame change performance, wiring, installation site etc.Aircraft power system and product that this method need to be used existing delivered user do very large change, are equivalent to remodeling or newly grind design, and feasibility is very poor.
Aircraft power system poor anti jamming capability, the electromagnetic emission problem that exceeds standard; make electromagnetic compatibility detection not up to standard; the overvoltage/undervoltage of revealing no evidence by investigation in line using, to cross that underfrequency protection power-off problem takes place frequently be the ubiquitous common problem of nearly all aviation power system, and indivedual type electromagnetic emission exceed standard and affects power consumption equipment normally the problem such as work is all urgently to be resolved hurrily in addition.After all everything is all that in AC power supply system composition product alternator controller, voltage regulator circuit, frequency sampling circuit are subject to due to strong electromagnetic and power-supply system electric field transmitted exceed standard.Because interference source is uncertain, interfering frequency is indefinite, by conduction or the bad differentiation of radiation approach, the current Research Thinking that installs the filter specially grinding additional is disturbed position more difficult definite, then considers the factors such as filter volume weight, so there is no effective achievement.
Typical 400Hz constant-speed and constant-frequency alternating current power-generating system is mainly made up of alternating current generator, mechanical type hydraulic constant speed drive device (being called for short permanent dress), alternator controller, AC current transformer group, interchange main contactor, Generation Control switch etc.Alternating current generator utilizes electromagnetic principle mainly to convert mechanical energy to electric energy; The rotating speed that permanent dress is main is responsible for the engine to transmit variation utilizes mechanical-hydraulic principle to change into constant rotating speed and drives generator; Alternator controller is mainly responsible for the functions such as the pressure regulation, control, protection, BIT detection, communication of system; The main responsive generator loading size of current of current transformer; Main contactor is mainly responsible for to electrical network power supply control on machine; Generation Control switch is mainly responsible for Generation Control.
Alternator controller in system is take microprocessor as core, except voltage regulator, internal electric source, is digitizer, and its protection and control function complete jointly by soft and hardware, and overvoltage crowbar has adopted two redundancy technologies.Controller has BIT function, and perfect fault-detecting ability and trouble isolation serviceability is provided, and it can be by electricity generation system Fault Isolation to LRU level, and controller failure is isolated SRU level.Testability and the maintainability of electricity generation system are greatly improved.Controller also has RS-422A communication interface, can send electricity generation system LRU Fault Isolation message code to power supply management center or host computer.
Summary of the invention
The technical problem solving
As mentioned above; existing aviation power system ubiquity 1) the mainstream model power-supply system that uses of delivered is subject to strong electromagnetic and causes product protection; system is not generated electricity, and on aircraft, main power source system cut-off affects task and completes and even jeopardize flight safety problem.Product returns factory and reprocesses fault and do not reappear, and is difficult to carry out fault location.2) when aviation power system detects according to Electro Magnetic Compatibility new standard, occur overvoltage protection and over frequency protection, system EMC detects not up to standard.3) technical staff researchs and solves thinking and concentrates on and in alternating current power-generating system, install the filter specially grinding additional and solve problem.Due to the randomness of electromagnetic interference, complexity, the unrepeatable particularity such as conduction or radiation approach, are disturbed position and are difficult to determine.So it is larger that this solution thinking changes system present situation, not evidence DeGrain by force and after deliberation of specific aim, also involving many factors such as structure, weight, installation site need coordinate etc., and feasibility is little.Moreover evidence is installed additional merely and is specially ground filter and have little effect to solving electric voltage frequency susceptibility, the main output feeder of sending out is added filter and lost more than gain, volume weight is greater than combination transmission generator, also may not necessarily deal with problems.
Technical scheme
Research to heterogenous power system failure, analysis, test show: it is the one of the main reasons of protection power-off that aviation power system is subject to strong electromagnetic.According to electromagnetic theory, by the comprehensive study analysis to interlock circuit, use variety of way method and technological means test to confirm, finally the weak link being easily disturbed is locked on the alternator controller of one of system core parts.And the internal circuit of alternator controller to be disturbed be the main cause that causes the protection of aviation power system overvoltage/undervoltage and cross underfrequency protection.
Aviation AC power supply system inside also exists electric field radiation to launch the problem that exceeds standard simultaneously, by the comprehensive electromagnetic compatibility detection of 400Hz AC power supply system to several types, use various analytical methods and technological means analytical test to show: the stube cable in aviation AC power supply system between alternating current generator and alternator controller is main electric field radiation emission source, this is excitation output cable wherein, permanent magnetic motor input line, RS422 (A) communication cable between NAMP simulator and alternator controller is main electric field radiation emission source: 1. permanent magnetic motor input cable interfering frequency is distributed in 1MHz～13MHz, 2. excitation output cable interfering frequency is distributed in 1MHz～27MHz, 3. RS422 (A) communication cable interfering frequency is distributed in 1MHz～30MHz.There is the 1. electromagnetic leakage frequency distribution 1MHz～30MHz in cabinet panel gap of slot leakage in controller box simultaneously, disturbs with the harmonic frequency of 3MHz left and right and occur; 2. the electromagnetic leakage frequency distribution 120MHz～140MHz in hole, the cabinet upper right corner; 3. the electromagnetic leakage frequency distribution 140MHz～150MHz of connecter hole.For this reason, the present invention proposes the method for the anti-electromagnetic interference of a kind of aviation AC power supply system.
Technical scheme of the present invention is:
The method of the anti-electromagnetic interference of described a kind of aviation AC power supply system, it is characterized in that: the reference edge at voltage regulator circuit first order comparator increases filtering capacitor, in frequency sampling circuit, between the positive and negative input pin port of comparator, increases a filtering capacitor; The filter capacitor scope of the filtering capacitor increasing in voltage regulator circuit is 180pF～1200pF, and the filter capacitor scope of the filtering capacitor increasing in frequency sampling circuit is 1000pF～4700pF;
The exciting voltage obtaining in the inner filter capacitor of alternator controller and full-bridge rectification installs filter additional between exporting, the insertion loss that this filter requires meets: from frequency 0.001MHz to frequency 0.3MHz, insertion loss increases to 40dB by 10dB, from frequency 0.3MHz to frequency 300MHz, insertion loss keeps 40dB;
On 4 communication cables of inner RS422 (A) the differential received input of alternator controller and difference transmission output, install filter additional; The insertion loss that this filter requires meets: from frequency 0.1MHz to frequency 0.3MHz, insertion loss keeps 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 30dB by 5dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 30dB; From frequency 10MHz to frequency 30MHz, insertion loss is decreased to 10dB by 30dB, and from frequency 30MHz to frequency 100MHz, insertion loss is decreased to 5dB by 10dB;
After the inner input/output electric connector of alternator controller, before three-phase transformer and permanent magnetic motor cut-in relay, install filter additional; The insertion loss that this filter requires meets: from frequency 0.01MHz to frequency 0.3MHz, insertion loss increases to 30dB by 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 75dB by 30dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 75dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 35dB by 75dB.
The method of the anti-electromagnetic interference of described a kind of aviation AC power supply system, is characterized in that: the filtering capacitor increasing in voltage regulator circuit is connected on the input pin port of first order comparator.
The method of the anti-electromagnetic interference of described a kind of aviation AC power supply system, is characterized in that: the sampled signal input at voltage regulator circuit first order comparator also increases filtering capacitor.
The method of the anti-electromagnetic interference of described a kind of aviation AC power supply system, is characterized in that: between the inner 28V power line of alternator controller and loop line, install filter additional; The insertion loss that this filter requires meets: from frequency 0.01MHz to frequency 1MHz, insertion loss increases to 80dB by 10dB; From frequency 1MHz to frequency 10MHz, insertion loss keeps 80dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 30dB by 80dB.
The method of the anti-electromagnetic interference of described a kind of aviation AC power supply system, is characterized in that: π type filtering electrical connector is installed on the input/output end port of alternator controller.
Beneficial effect
In the time of the method that does not adopt the present invention to propose, typical 400Hz constant-speed and constant-frequency alternating current power-generating system is in the time detecting by the relevant EMC Standard requirement of country:
1, when bunch of cables injected pulse excitation, the test of damping sinusoidal transient conducted susceptibility project: in process of the test; there is output voltage swing by a relatively large margin continually because being disturbed in product; frequency jitter, signal disorder is until overvoltage/undervoltage or excessively underfrequency protection stop generating.
2, in conduction sensitization test process, product voltage significantly swings, and amplitude peak is that 11V(far deviates from normal index), there is protection power-off in band segment product even.
3,, in electric field radiation emission test, product exists the transmitting of different amplitudes to exceed standard between 1M～200Mhz.
Adopt after technology of the present invention, product is in the time carrying out above test, and voltage is basicly stable; do not swing; also no longer occur, because being disturbed occurrence frequency protection or overvoltage/undervoltage protection, having improved the reliability of product, make the Electro Magnetic Compatibility susceptibility requirement of power-supply system relevant national standard.Meanwhile, while conducting transmitting and electric field radiation emission test, its trial curve is all below the limiting value of standard-required.
Accompanying drawing explanation
Fig. 1: alternator controller schematic circuit block diagram;
Fig. 2: the installation site schematic diagram of the inner filter of controller;
Fig. 3: voltage regulator circuit fundamental diagram;
Fig. 4: frequency sampling circuit working schematic diagram.
Fig. 5: the insertion loss curve that the filter that the radiation of inhibition excitation output line exceeds standard requires;
Fig. 6: the installation site figure of the filter that the radiation of inhibition excitation output line exceeds standard;
Fig. 7: the insertion loss curve that the filter that the radiation of inhibition RS422 (A) communication cable exceeds standard requires;
Fig. 8: the installation site figure of the filter that the radiation of inhibition RS422 (A) communication cable exceeds standard;
Fig. 9: the insertion loss curve that the filter that the radiation of inhibition permanent magnetic motor supply line exceeds standard requires;
Figure 10: the installation site figure of the filter that the radiation of inhibition permanent magnetic motor supply line exceeds standard;
Figure 11: the insertion loss curve of the filter that the radiation of inhibition 28V power line exceeds standard.
Embodiment
Below in conjunction with specific embodiment, the present invention is described:
Typical 400Hz constant-speed and constant-frequency alternating current power-generating system is mainly made up of alternating current generator, mechanical type hydraulic constant speed drive device (being called for short permanent dress), alternator controller, AC current transformer group, interchange main contactor, Generation Control switch etc.Alternating current generator utilizes electromagnetic principle mainly to convert mechanical energy to electric energy; The rotating speed that permanent dress is main is responsible for the engine to transmit variation utilizes mechanical-hydraulic principle to change into constant rotating speed and drives generator; Alternator controller is mainly responsible for the functions such as the pressure regulation, control, protection, BIT detection, communication of system; The main responsive generator loading size of current of current transformer; Main contactor is mainly responsible for to electrical network power supply control on machine; Generation Control switch is mainly responsible for Generation Control.
Alternator controller in system is take microprocessor as core, except voltage regulator, internal electric source, is digitizer, and its protection and control function complete jointly by soft and hardware, and overvoltage crowbar has adopted two redundancy technologies.Controller has BIT function, and perfect fault-detecting ability and trouble isolation serviceability is provided, and it can be by electricity generation system Fault Isolation to LRU level, and controller failure is isolated SRU level.Testability and the maintainability of electricity generation system are greatly improved.Controller also has RS-422A communication interface, can send electricity generation system LRU Fault Isolation message code to power supply management center or host computer.
Research to heterogenous power system failure, analysis, test show: it is the one of the main reasons of protection power-off that aviation power system is subject to strong electromagnetic.According to electromagnetic theory, by the comprehensive study analysis to interlock circuit, use variety of way method and technological means test to confirm, finally the weak link being easily disturbed is locked on the alternator controller of one of system core parts.And the internal circuit of alternator controller to be disturbed be the main cause that causes the protection of aviation power system overvoltage/undervoltage and cross underfrequency protection.
The internal circuit of alternator controller comprises voltage regulator circuit and frequency sampling circuit.
Alternator controller voltage regulator circuit major function be assurance system three-phase output voltage point of adjustment (hereinafter to be referred as POR) voltage stabilization at 115VAC, and there is three-phase output voltage height and limit mutually and generator output current limitation function.The three-phase voltage mean value sensitive circuit responsive electricity generation system POR three-phase voltage mean value of sampling, after signal synthesis, pulse-width modulation, shaping amplification and power amplification, export to exciter excitation winding, control exciter current of generator, guarantee that POR voltage stabilization is at (115V); Load current limit circuit sensitive dynamo current signal.In the time that the load of generator exceedes setting, this circuit reaches maximum by the output current that reduces exciting current of exciter restriction generator; The responsive POR three-phase voltage of high phase voltage limiting circuit.In the time that in electricity generation system POR three-phase voltage, arbitrary phase voltage exceedes setting, this circuit forced excitation machine exciting current reduces, and arbitrary phase voltage at restriction POR place exceedes Up limit.
Alternator controller frequency sampling circuit major function is by the collection to permanent magnetic motor frequency, and the electricity generation system of realization is crossed, the protection of under-frequency.Because the frequency of permanent magnetic motor is directly proportional to the frequency that main generating is pressed, by can realize the monitoring of sending out frequency to main to the monitoring of permanent magnetic motor frequency, typical frequency sampling circuit is exactly to carry out dividing potential drop, filtering, integer from permanent magnetic motor transformer secondary voltage then to send into counter and count.The dynamo-electric pressure through transformation, dividing potential drop, conditioning, shaping of three-phase permanent amplified and obtained square wave, and this square wave is consistent with the frequency of permanent magnetic motor.To send into counter and count whole gatherer process.
Voltage regulator circuit is in order to reach the object of regulation output voltage stabilization, voltage-sensitive circuit is wherein got its mean value by three-phase output voltage through halfwave rectifier filtering, after dividing potential drop with load current feedback signal synthesis, compare output first order pwm signal with reference voltage, this signal and high phase voltage restriction comparator output signal comprehensively again secondary and reference voltage relatively carry out shaping amplification, then go to drive field effect transistor to reach the object of regulation output voltage stabilization.This is the typical Principles of Regulation of existing alternator controller product.In the time that above typical voltage regulating line is subject to electromagnetic interference (comprise and pass to and radiation), voltage regulator circuit will be lacked of proper care, and causes generator output voltage to swing, and interference signal changes, and output voltage is along with variation; Interference signal is stronger, and change in voltage is larger, until protect, this is determined by its circuit theory.No matter be three-phase voltage mean value sensitive circuit, high phase voltage limiting circuit or load current limit circuit, sampled signal is all through halfwave rectifier filtering processing again.This filtering comprises the filtering to part interference signal, applicant in research process specially in these places and the each resistance of bleeder circuit place, the defeated entry/exit end of comparator at different levels etc. add various filtering measures everywhere and attempt in a large number, effect is all not obvious, also add filtering measures trial at high phase voltage restriction comparator reference edge and second level comparator reference end in addition, effect is still not obvious.Only increase filtering measures at the reference edge of regulating circuit first order comparator, interference signal is got lodged in outside input port, can not enter comparator and participate in more just having remarkable result, more auxiliary to add filtering measures effect with sampled signal input more perfect.And the place (containing benchmark and sampling) that installs filtering measures additional is preferably also at first order comparator circuit chip pin input port place, rather than other place, circuit equivalent place.
So in voltage regulator circuit, the core that suppresses strong electromagnetic method is appropriate position and parameter area accurately: filtering capacitor of increase in the localities of most suitable circuit position place and chip pin input port in this voltage regulator circuit, filtering high reject signal, make output voltage stabilization, install many again filter and braking measure additional in other place also of no avail, effect is bad, effect is little, only increase filtering capacitor at the reference edge of regulating circuit first order comparator, just can achieve the desired result, and the place that installs filtering measures additional is preferably in first order comparator circuit chip pin input port place.Assist and add filter capacitor with sampled signal input again, effect is more perfect; Filtering performance parameter must be suitable, accurate, otherwise can not reach optimum efficiency, and output voltage necessarily also swings, and a large amount of experiments show, the filter capacitor scope of the filtering capacitor increasing in voltage regulator circuit is: 180pF～1200pF.
In the time that typical frequency collection circuit is subject to electromagnetic interference (comprise and pass to and radiation); the frequency gathering just there will be deviation, and operating state that can accurately implementing monitoring power-supply system, when serious; even occur over frequency protection, this is determined by its circuit theory.Primary circuit permanent magnetic motor voltage reality after transformation, dividing potential drop had been carried out filtering processing.Fact proved, this filtering can play a part to a certain extent the antijamming capability of frequency collection circuit, but in the time that the interference signal that apply reaches certain intensity, it is not enough that original filter effect just seems.Applicant in research process special in these places and other positions of bleeder circuit each resistance place and this circuit add various filtering measures and attempt, effect is all not obvious; Only increase filtering measures at the positive and negative input pin end (rather than circuit equivalent place is not local) of frequency sampling circuit comparator, interference signal is suppressed to shaping input port place, can not enter comparator and participate in more just having remarkable result.
So in frequency collection circuit, the core that suppresses strong electromagnetic method is also appropriate position and parameter area accurately: in this frequency sampling circuit, between the positive and negative input pin port of comparator chip pin, increase a filtering capacitor device, filtering high reject signal, make the frequency that gathers accurate, install much more again filters additional in other place and braking measure effect is bad, effect little; Filtering performance parameter must be suitable, accurate; otherwise can not reach optimum efficiency; there is deviation or even the excessive over frequency protection that causes of deviation in the frequency collecting, a large amount of experiments show, the filter capacitor scope of the filtering capacitor increasing in frequency sampling circuit is: 1000pF～4700pF.
Aviation AC power supply system inside also exists electric field radiation to launch the problem that exceeds standard simultaneously, by the comprehensive electromagnetic compatibility detection of 400Hz AC power supply system to several types, use various analytical methods and technological means analytical test to show: the stube cable in aviation AC power supply system between alternating current generator and alternator controller is main electric field radiation emission source, this is excitation output cable wherein, permanent magnetic motor input line, RS422 (A) communication cable between NAMP simulator and alternator controller is main electric field radiation emission source: 1. permanent magnetic motor input cable interfering frequency is distributed in 1MHz～13MHz, 2. excitation output cable interfering frequency is distributed in 1MHz～27MHz, 3. RS422 (A) communication cable interfering frequency is distributed in 1MHz～30MHz.
With reference to accompanying drawing 6, the exciting voltage obtaining in the inner filter capacitor C1 of alternator controller and full-bridge rectification installs filter additional between exporting, and filtering electric field transmitted signal, makes excitation output voltage connecting line clean, and electric field transmitted meets the requirements.
Launch according to the excitation outlet line electric field radiation recording the frequency range and the amplitude that exceed standard, filter is except wanting the unit for electrical property parameters of coincidence circuit, topmost or insertion loss must meet certain requirement, as shown in Figure 5, the insertion loss that filter requires meets: from frequency 0.001MHz to frequency 0.3MHz, insertion loss increases to 40dB by 10dB, and from frequency 0.3MHz to frequency 300MHz, insertion loss keeps 40dB.Test shows, the filter with this insertion loss value has best inhibition.
With reference to accompanying drawing 8, on 4 communication cables of inner RS422 (A) the differential received input of alternator controller and difference transmission output, install filter additional, filtering electric field transmitted signal, electric field transmitted meets the requirements.And inside and outside generator, controller installs filter outward additional and braking measure is all infeasible.
Launch according to the communication input and output circuit electric field radiation recording the frequency range and the amplitude that exceed standard, filter is except wanting the unit for electrical property parameters of coincidence circuit, topmost or insertion loss must meet certain requirement, as shown in Figure 7, the insertion loss that filter requires meets: from frequency 0.1MHz to frequency 0.3MHz, insertion loss keeps 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 30dB by 5dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 30dB; From frequency 10MHz to frequency 30MHz, insertion loss is decreased to 10dB by 30dB, and from frequency 30MHz to frequency 100MHz, insertion loss is decreased to 5dB by 10dB.Test shows, the filter with this insertion loss value has best inhibition.
With reference to accompanying drawing 10, after the inner input/output electric connector of alternator controller, before three-phase transformer and permanent magnetic motor cut-in relay, install filter additional, filtering electric field transmitted signal, makes permanent magnetic motor output voltage connecting line clean, and electric field transmitted meets the requirements.And inside and outside generator, controller installs filter outward additional and braking measure is all infeasible.
Launch according to the permanent magnetic motor incoming line electric field radiation recording the frequency range and the amplitude that exceed standard, filter is except wanting the unit for electrical property parameters of coincidence circuit, topmost or insertion loss must meet certain requirement, as shown in Figure 9, the insertion loss that filter requires meets: from frequency 0.01MHz to frequency 0.3MHz, insertion loss increases to 30dB by 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 75dB by 30dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 75dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 35dB by 75dB.Test shows, the filter with this insertion loss value has best inhibition.
Between the inner 28V power line of this external alternator controller and loop line, install filter additional; With reference to accompanying drawing 11, the insertion loss that this filter requires meets: from frequency 0.01MHz to frequency 1MHz, insertion loss increases to 80dB by 10dB; From frequency 1MHz to frequency 10MHz, insertion loss keeps 80dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 30dB by 80dB.π type filtering electrical connector is installed on the input/output end port of alternator controller.
By above-mentioned measure, aviation power system is in the time carrying out above test, and voltage is basicly stable; do not swing; also no longer occur, because being disturbed occurrence frequency protection or overvoltage/undervoltage protection, having improved the reliability of product, make the Electro Magnetic Compatibility susceptibility requirement of power-supply system relevant national standard.Meanwhile, while conducting transmitting and electric field radiation emission test, its trial curve is all below the limiting value of standard-required.
Claims (5)
1. the method for the anti-electromagnetic interference of aviation AC power supply system, it is characterized in that: the reference edge at voltage regulator circuit first order comparator increases filtering capacitor, in frequency sampling circuit, between the positive and negative input pin port of comparator, increases a filtering capacitor; The filter capacitor scope of the filtering capacitor increasing in voltage regulator circuit is 180pF～1200pF, and the filter capacitor scope of the filtering capacitor increasing in frequency sampling circuit is 1000pF～4700pF;
The exciting voltage obtaining in the inner filter capacitor of aviation AC power supply system alternator controller and full-bridge rectification installs filter additional between exporting, the insertion loss that this filter requires meets: from frequency 0.001MHz to frequency 0.3MHz, insertion loss increases to 40dB by 10dB, from frequency 0.3MHz to frequency 300MHz, insertion loss keeps 40dB;
On 4 communication cables of inner RS422 (A) the differential received input of aviation AC power supply system alternator controller and difference transmission output, install filter additional; The insertion loss that this filter requires meets: from frequency 0.1MHz to frequency 0.3MHz, insertion loss keeps 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 30dB by 5dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 30dB; From frequency 10MHz to frequency 30MHz, insertion loss is decreased to 10dB by 30dB, and from frequency 30MHz to frequency 100MHz, insertion loss is decreased to 5dB by 10dB;
After the inner input/output electric connector of aviation AC power supply system alternator controller, before three-phase transformer and permanent magnetic motor cut-in relay, install filter additional; The insertion loss that this filter requires meets: from frequency 0.01MHz to frequency 0.3MHz, insertion loss increases to 30dB by 5dB; From frequency 0.3MHz to frequency 3MHz, insertion loss increases to 75dB by 30dB; From frequency 3MHz to frequency 10MHz, insertion loss keeps 75dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 35dB by 75dB.
2. the method for the anti-electromagnetic interference of a kind of aviation AC power supply system according to claim 1, is characterized in that: the filtering capacitor increasing in voltage regulator circuit is connected on the input pin port of first order comparator.
3. according to the method for the anti-electromagnetic interference of a kind of aviation AC power supply system described in claim 1 or 2, it is characterized in that: the sampled signal input at voltage regulator circuit first order comparator also increases filtering capacitor.
4. the method for the anti-electromagnetic interference of a kind of aviation AC power supply system according to claim 3, is characterized in that: between the inner 28V power line of aviation AC power supply system alternator controller and loop line, install filter additional; The insertion loss that this filter requires meets: from frequency 0.01MHz to frequency 1MHz, insertion loss increases to 80dB by 10dB; From frequency 1MHz to frequency 10MHz, insertion loss keeps 80dB; From frequency 10MHz to frequency 300MHz, insertion loss is decreased to 30dB by 80dB.
5. the method for the anti-electromagnetic interference of a kind of aviation AC power supply system according to claim 4, is characterized in that: π type filtering electrical connector is installed on the input/output end port of aviation AC power supply system alternator controller.
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| CN111474435A (en) * | 2020-04-28 | 2020-07-31 | 中国汽车技术研究中心有限公司 | System and method for testing alternating current charging electromagnetic interference of electric vehicle |
| CN113687168A (en) * | 2021-08-30 | 2021-11-23 | 北京航空航天大学 | System electromagnetic compatibility index decomposition method for 10kHz-18GHz electric field radiation emission |
| CN114460381A (en) * | 2022-01-25 | 2022-05-10 | 中国船舶重工集团公司第七二四研究所 | Rapid assessment method for conduction sensitivity of motor controller |
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| CN108093106B (en) * | 2017-12-28 | 2020-05-22 | 维沃移动通信有限公司 | Mobile terminal |
| CN111474435A (en) * | 2020-04-28 | 2020-07-31 | 中国汽车技术研究中心有限公司 | System and method for testing alternating current charging electromagnetic interference of electric vehicle |
| CN113687168A (en) * | 2021-08-30 | 2021-11-23 | 北京航空航天大学 | System electromagnetic compatibility index decomposition method for 10kHz-18GHz electric field radiation emission |
| CN114460381A (en) * | 2022-01-25 | 2022-05-10 | 中国船舶重工集团公司第七二四研究所 | Rapid assessment method for conduction sensitivity of motor controller |
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