CN103558461A - Method for testing surge pulse current resistance of fuse - Google Patents
Method for testing surge pulse current resistance of fuse Download PDFInfo
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- CN103558461A CN103558461A CN201310401352.3A CN201310401352A CN103558461A CN 103558461 A CN103558461 A CN 103558461A CN 201310401352 A CN201310401352 A CN 201310401352A CN 103558461 A CN103558461 A CN 103558461A
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Abstract
The invention discloses a method for testing the surge pulse current resistance of a fuse, belonging to the technical field of the fuse. The method comprises steps of selecting samples and carrying out an electrical test, grouping the samples, determining the parameter of surge pulse waveform current applied to the tested samples and recording the test data, and analyzing the test data and obtaining a test result. According to the method, the surge pulse current resistance of the fuse can be accurately tested, a scientific basis is provided for evaluating whether the fuse can withstand the shock of a certain amount of current, a scientific guidance is provided for the reasonable selection of fuses, losses caused by the wrong selection of fuses are eliminated, and the shortening of the design cycle of a fuse manufacturer and the reduction of repair costs are facilitated.
Description
Technical field
The invention belongs to fuse technical field, be specifically related to a kind of method of testing fuse antisurge pulse current.
Background technology
Fuse blows device is the over-current protection device in a kind of series connection and protected circuit, refers to when electric current surpasses setting, and the heat producing with itself makes melt fusing, a kind of electrical equipment of disconnecting circuit.Fuse is to surpass setting after a period of time according to electric current, and the heat producing with himself makes melt fusing, thereby circuit is disconnected; A kind of current protector that uses this principle to make.Fuse is widely used in high and low voltage electric distribution system and control system and consumer, as the protector of short circuit and excess current, is to apply one of the most general protection device.
Aerospace engineering is a high-tech, high risk systems engineering, the especially manned astro-engineering, all very high to its security, reliability requirement both at home and abroad.Aerospace with fuse as a kind of effectively, security reliability device that efficiency is higher, be widely used in, in domestic and international various space flight device, in science and techniques of defence and civil safety field, occupying extremely important status.If fuse loses efficacy, just may cause whole protected thrashing, bring about great losses.Along with the development of aerospace industry, the protective value of fuse is had higher requirement.
But in general,, due to the special handling characteristics of fuse, its reliability is different from the reliability of the electronic devices and components such as relay or resistance, electric capacity.The operating chacteristics of fuse is mainly considered defencive function, wishes that fuse can reliably cut off in time electric current when circuit breaks down excess current, and this just requires the responsiveness of fuse quicker; And melting heat energy value is mainly considered bearing function, to wish that fuse can bear when non-down pulse electric current appears in contactor moment, and also can bear in complete machine uses, this just requires the reaction velocity of fuse suitably slow; These two requirements have conflict or have restriction, need to carry out overall equilbrium, make selected fuse can guarantee the smooth switch of electronic product when normal use, can ensure enough defencive functions again, timely and effectively protective device and personal safety; Really accomplish the time marquis unlikely misoperation again that selected fuse can fuse safely the time marquis that this is disconnected, should not be disconnected.The integrity problem of research fuse, will study fuse exactly how according to the requirement of protected object, correctly and safely disjunction fault current.Yet, along with constantly updating of fuse material, structure and technology, introduced how new failure modes and mechanisms, for evaluating efficiently Fuse Reliability, brought new challenge.So the evaluation scheme that carries out reliability consideration and formulate a set of reasonable for highly reliable fuse just seems particularly important.
Limit assessment technology provides approach for analyzing the nargin and the surplus that require between correlation function, Performance And Reliability and the standard of paying close attention in fuse application, and in the latent defect of design, material or process aspect, adopt the high method of accelerating stress and sustained stress, to assess fuse reliability level under heat, electric equal stress effect.Therefore limit assessment technology can help technology for eliminating defect, greatly improve designed reliability, guarantee that product can obtain early stage high reliability, make product there is high outfield reliability, the design cycle of product greatly reduces, producing cost reduces greatly, and maintenance cost reduces greatly, because the product of paying has higher reliability.
In the application circuit of fuse reality, often can produce of short duration surge current; because input filter capacitor charges rapidly; so this surge current is far longer than stable state input current; thereby make fuse produce mechanical fatigue; reduce the fusible link life-span; even in some cases, it can thrust fusible link.Surge current is a plurality of, continuous pulses often, can make fuse produce heat, change its fuse resistance, and therefore for some circuit, whether measurement fuse can sustain a certain amount of rush of current is considerable.
At present, U.S. NASA, European ESA and China GJB5850 all to highly reliable fuse detection and the appraisal procedure in the processes such as production, assurance done relevant regulations, such as random vibration, impact, aging, operating chacteristics test etc.Yet, in each Fuse standard, still do not formulate the method for evaluating fuse antisurge pulse current, fuse tradition fail-test basic categories is not included in the test of antisurge pulse capability evaluation in, and China is still immature to the grasp level of this limit technology, limited to surge pulse current percentage of intelligibility.According to statistics, it is also a major reason that causes fuse to lose efficacy that surge current impacts cumulative effect, and therefore, the research that just lacks the fuse surge life assessment of pulse standard is very necessary.
Summary of the invention
In order to address the above problem, the invention provides a kind of method of testing fuse antisurge pulse current, for weighing fuse, whether can sustain a certain amount of rush of current scientific basis is provided, for the Rational choice of fuse provides scientific guidance, eliminate and choose improper causing damage because of fuse; Contribute to shorten the design cycle of fuse production firm simultaneously and reduce maintenance cost.
The present invention addresses the above problem adopted technical scheme to be:
A method of testing fuse antisurge pulse current, comprises the following steps:
(1) the fuse sample of choosing is carried out to electrical testing, electrical testing comprises fall-of potential test and resistance test, and electrical testing should meet the requirement to resistance and voltage drop;
(2) sample is divided into contrast groups and test group; Test group will apply surge pulse waveform electric current, and contrast groups is for contrasting with test group;
(3), according to the working line of fuse, determine the surge pulse waveform current parameters applying; Described parameter comprises pulse waveform, pulse peak current, duration of pulse and recurrence interval;
(4) sample is connected in test circuit, described test circuit comprises monitor portion, current-limiting resistance, electronic load and power supply, and described monitoring comprises monitor oscilloscope and sample resistance; Sample resistance, current-limiting resistance, electronic load, power supply closed loop in series, described monitor oscilloscope is connected in parallel on sample resistance, and described electronic load is used for producing surge pulse, and described monitor oscilloscope is used for monitoring sample; According to definite parameter in step (3), test, take every 10,000 times as an examination point, after sample is cooling, it is carried out to outward appearance and mechanical verification, measure its resistance, voltage drop and calculate resistance varying-ratio, good each sample data of record, till sample need be accomplished fusing;
(5) analyzing test data is obtained a result.
Before carrying out electrical testing, in order to test more accurately and reliably, also should to carry out to sample the inspection of outward appearance and mechanical property.
Further, the electric current of the fall-of potential test in described step (1) is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.
Further, described pulse waveform should be able to effectively be simulated the common surge pulse waveform in the actual use of fuse circuit.
Further, described pulse peak current should be in conjunction with the real work current standard of the pulse peak current in fuse real work circuit and derate use; Or set according to half of the pulse peak current in fuse real work circuit.
Further, the described duration of pulse be the fuse blows time 1/2 or according to definite pulse peak current, determine.
Further, described recurrence interval definite be can mimic channel in actual surge current ultimate limit state, can make again test specimen have the enough heat radiation time in continuous impulse effect gap.
Further, the resistance of described sample resistance is 0.1 Ω.
Further, described current-limiting resistance is that range of adjustment is the rheochord of 0-1 Ω, the pulse current value being used in regulating circuit.
The present invention has following beneficial effect:
According to testing procedure of the present invention, can test out accurately the ability of the antisurge pulse current of fuse, for whether measurement fuse can sustain a certain amount of rush of current, provide scientific basis, for the Rational choice of fuse provides scientific guidance, eliminate and choose improper causing damage because of fuse; Contribute to shorten the design cycle of fuse production firm simultaneously and reduce maintenance cost.
The electric current that the present invention initially carries out fall-of potential test to tested fuse sample is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.Can make the data of test more accurate, be convenient to fuse to make the judgement of science.
Step of the present invention, in carrying out the process of surge pulse, is detecting it after tested fuse is cooling, can eliminate the change of Yin Wendu and cause the inaccurate of test data, can accurately test out the ability of antisurge pulse current.
Accompanying drawing explanation
Fig. 1 is common surge pulse waveform, (a) is sinusoidal waveform, is (b) square-wave waveform;
Fig. 2 is the test circuit sketch of the embodiment of the present invention;
Fig. 3 is surge pulse schematic diagram;
Fig. 4 is embodiment pulse test group test plan figure;
Fig. 5 is that embodiment SF12L-125-1.0 sample resistance varying-ratio is with the variation schematic diagram of examination number of times;
Fig. 6 is that embodiment M1206F-S-125-1.0 sample resistance varying-ratio is with the variation schematic diagram of examination number of times;
Fig. 7 is that embodiment SF12L-125-5.0 sample resistance varying-ratio is with the variation schematic diagram of examination number of times;
Fig. 8 is that embodiment M1206F-S-125-5.0 sample resistance varying-ratio is with the variation schematic diagram of examination number of times;
Mark in figure: 1, monitor oscilloscope, 2, sample resistance, 3, power supply, 4, electronic load, 5, current-limiting resistance, 6, fuse sample.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments, and described embodiment is only the present invention's part embodiment, is not whole embodiment.Embodiment based in the present invention, those of ordinary skill in the art, not making other all embodiment that obtain under creative work prerequisite, belongs to protection scope of the present invention.
The method of test fuse antisurge pulse current, comprises the following steps:
One, the fuse sample of choosing is carried out to electrical testing, electrical testing comprises fall-of potential test and resistance test, and electrical testing should meet the requirement to resistance and voltage drop;
Two, sample is divided into contrast groups and test group; Test group will apply surge pulse waveform electric current, and contrast groups is for contrasting with test group;
Three,, according to the working line of fuse, determine the surge pulse waveform current parameters applying; Described parameter comprises pulse waveform, pulse peak current, duration of pulse and recurrence interval;
Four, sample is connected in test circuit, described test circuit comprises monitor portion, current-limiting resistance, electronic load and power supply, and monitoring comprises monitor oscilloscope and sample resistance; Sample resistance, current-limiting resistance, electronic load, power supply closed loop in series, monitor oscilloscope is connected in parallel on sample resistance, and electronic load is used for producing surge pulse, and monitor oscilloscope is used for monitoring sample; According to definite parameter in step (3), test, take every 10,000 times as an examination point, after sample is cooling, it is carried out to outward appearance and mechanical verification, measure its resistance, voltage drop and calculate resistance varying-ratio, good each sample data of record, till sample need be accomplished fusing;
Five, analyzing test data is obtained a result.
Before carrying out electrical testing, in order to test more accurately and reliably, also should to carry out to sample the inspection of outward appearance and mechanical property.
Further, the electric current of the fall-of potential test in described step one is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.
Further, described pulse waveform should be able to effectively be simulated the common surge pulse waveform in the actual use of fuse circuit.
Further, described pulse peak current should be in conjunction with the real work current standard of the pulse peak current in fuse real work circuit and derate use; Or set according to half of the pulse peak current in fuse real work circuit.
Further, the described duration of pulse be the fuse blows time 1/2 or according to definite pulse peak current, determine.
Further, described recurrence interval definite be can mimic channel in actual surge current ultimate limit state, can make again test specimen have the enough heat radiation time in continuous impulse effect gap.
Further, the resistance of described sample resistance is 0.1 Ω.
Further, described current-limiting resistance is that range of adjustment is the rheochord of 0-1 Ω, the pulse current value being used in regulating circuit.
According to testing procedure of the present invention, can test out accurately the ability of the antisurge pulse current of fuse, for whether measurement fuse can sustain a certain amount of rush of current, provide scientific basis, for the Rational choice of fuse provides scientific guidance, eliminate and choose improper causing damage because of fuse; Contribute to shorten the design cycle of fuse production firm simultaneously and reduce maintenance cost.
The electric current that the present invention initially carries out fall-of potential test to tested fuse sample is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.Can make the data of test more accurate, be convenient to fuse to make the judgement of science.
Step of the present invention, in carrying out the process of surge pulse, is detecting it after tested fuse is cooling, can eliminate the change of Yin Wendu and cause the inaccurate of test data, can accurately test out the ability of antisurge pulse current.
Fusing is relevant with the heat that fuse produces, and the heat of generation can be followed Q=I
2rt, has determined when making material and the shape thereof of melt, its resistance R has just been determined (if not considering its temperature-coefficient of electrical resistance) relatively.When electric current flows through it, it will generate heat, along with its thermal value of increase of time is also increasing.The size of electric current and resistance has been determined the speed that produces heat, and the structure of melt and the situation of its installation have been determined the speed of heat dissipation, and the heat radiation of fuse mainly consists of i.e. conduction, convection current and radiation three kinds of heat-transfer mechanisms.These three kinds of heat transfer types, its rate of heat transfer is all relevant with the temperature difference of fuse and external environment.When temperature difference is larger, the speed of heat transfer is also larger.
If when the speed of generation heat is less than the speed of heat dissipation, melt can not fuse.If when the speed of generation heat equals the speed of heat dissipation, within considerable time, it can not fuse yet.If when the speed of generation heat is greater than the speed of heat dissipation, the heat producing so will get more and more.Because it has a constant specific heat and quality, the increase of its heat just shows in the rising of temperature again, when temperature be elevated to the fusing point of melt when above melt just there is fusing.
When the speed of generation heat equals rate of heat dispation, it is constant that temperature reaches, and do not change in time, and now the temperature of fuse reaches balance.
When the speed of fuse generation heat is greater than radiating rate, temperature rises in time.When if rate of heat dispation can not be raised to the speed that equals heat generation because of the rising of self-temperature, the temperature of fuse conducting part will rise always, until reach the temperature of fusion of conducting metal, and by electric conductor fusing, reach the object of overcurrent protection.Now be divided into two kinds of situations: (1) is the scope of general user's normal use, i.e. moderate overload situation.When the electric current of the fuse of flowing through is during higher than the required value of fuse blows, fuse just starts heating, and temperature raises gradually with the heat that electric current was produced in balancing circuitry.Yet electric heating speed is greater than radiating rate, fuse first fuses, and after-current is ended, and after 0.1 second to 4 hours or longer time, fuse is ended overcurrent, and this is the normal response to overload.(2) be to refer generally to fusing time be less than below 8ms, i.e. the situation of high overload.In this case, the current value of the fuse of flowing through is far longer than the load current value of fuse, and fuse reaches fusing point very soon, to such an extent as to have no time, by conduction, convection current or radiation, dispel the heat, so the electric power of consumption equals the melting heat energy value of fuse, thereby makes system there is no thermal loss.
Above the second state is when having momentary pulse surge in circuit.When being a circuit with surge current while selecting fuse, should guarantee fuse I
2t≤surge I
2t * Fp, wherein Fp is for doubling the factor.Surge current is a plurality of often, continuous, can make fuse produce heat, changes fuse resistance, therefore needs to consider to double factor Fp.For specific products, Fp is generally set-point.Surge I
2t=a * Ip
2t, wherein Ip is pulse peak current, and for different surge pulse waveforms, the value of scale factor a is also different.If Fig. 2 (a) is the pulse of common sinusoidal waveform surge, a value gets 1/2 more, and if Fig. 2 (b) is the pulse of common square wave type surge, a value gets 1.
User, when selecting fuse, should notice that in circuit, maximum impulse surge energy should be lower than fuse blows institute energy requirement.Generally determine in this state melting heat energy value MeltingI
2t, thereby selecting properly product.
In order to design fuse surge pulse limit testing experiment, answer the impulsive condition in confirmed test, comprise pulse waveform, pulse peak current, duration of pulse, cycle.In test some become parameter really in Liru antisurge pulse ability pulse number, heat radiation time really establish a capital the failure mechanism of the latent defect that need to consider that fuse is corresponding.
Fuse is in operating circuit, and under the effect of pulse current, fusible link and fusible link material around all will reach quite high temperature.This temperature deficiency is so that fusible link fusing, but it can impel the composition metallic atom of fusible link in material, to carry out atomic heat diffusion towards periphery completely.As time goes on, increasing metallic atom thermal diffusion, to surrounding medium material, has a greater change direct current resistance DCR, the catabiosis of Here it is fuse.After fuse appearance is aging, under the effect of reduced-current, just may fuse, this will affect the normal operation of circuit.The softening point lower (if conventional chip fuse is 500 ℃ of left and right) of fusible link surrounding medium material, at a certain temperature the composition metallic atom of fusible link towards periphery dielectric material to carry out the trend of atomic heat diffusion just larger, fuse is aging just faster.
In addition, fuse application circuit conventionally can produce the pulse high current of moment when start.Though the duration is very short, pulse energy is still larger.When being subject to surge impact, the fuse of fuse can produce the physical shock effect of expanding with heat and contract with cold.Under extreme case, continuous repeatedly surge impact can make fuse cross section produce crack, even can directly thrust fuse.This impact fracture meeting occurs in the central part of fuse, and break distance is shorter.At present during general type selecting, require the cumlative energy of pulse mostly be most fuse melting heat energy 22%.
Based on above reason, when the pulse of design experiment surge, will Rational choice pulse peak current and recurrence interval, appropriate actual surge current ultimate limit state in mimic channel, can make again test specimen have the enough heat radiation time in continuous impulse effect gap, to guarantee demonstration test percent of pass.Wherein the reflection of heat radiation time is in test the comprehensive consideration in pulse width and cycle.
Embodiment
Before testing, according to the circuit diagram shown in Fig. 2, connect testing apparatus and assessment apparatus.In this method of testing, use to equipment mainly comprise testing apparatus and limit assessment apparatus, limit evaluation test equipment needs to meet the oscillograph of test pulse waveform requirement.Testing apparatus requires to obtain the response data of test specimen.
Step 1: what the employing of this example was selected is for the high reliability fuse on satellite, select test specimen to select the typical highly reliable fuse of two kinds of models (M1206F-S-125, SF12L-125) of domestic certain company's development and production, packing forms is respectively plug-in type lead packages and chip ceramic package.The test specimen of choosing first carries out the inspection of outward appearance and mechanical property, after qualified, must pass through electrical testing, indices parameter should meet closed specification requirement, detailed says, wherein M1206F-S range of models should be with reference to the requirement of ESCCGenericSpecificationNo.4008 and ESCCDetailSpecificationNo.4008/001, and SF12L range of models should be with reference to the requirement of MIL-PRF-23419G and MIL-PRF-23419G/12D.Electrical testing comprises fall-of potential test and resistance test; Concrete content measurement is as shown in table 1.Wherein, each range of models is chosen the sample of maximum rated current value and minimum load current value by specification.When sample is carried out to fall-of potential test, the electric current that carries out fall-of potential test is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.Can make the data of test more accurate, be convenient to fuse to make the judgement of science.
Table 1 sample survey program
Step 2: sample is divided into contrast groups and test group; Test group will apply surge pulse waveform electric current, and contrast groups is for contrasting with test group.
Each model (M1206F-S-125, SF12L-125) series is chosen the sample of maximum rated current value and minimum load current value by specification, representative and specific aim, if minimum gauge in SF12L-125 series samples is 1A, maximum specification is 5A, so represent that with SF12L-125-1.0 load current value is the sample of 1A, SF12L-125-5.0 is that load current value is the sample of 5A.Test is organized every group and is chosen 3 samples, and every group of contrast groups chosen 2 samples.Concrete grouping situation is as shown in table 2.
Table 2 test specimen grouping situation
Step 3: according to the working line of fuse, determine the surge pulse waveform current parameters applying; Described parameter comprises pulse waveform, pulse peak current, duration of pulse (t1) and recurrence interval (t2).Surge pulse schematic diagram as shown in Figure 3.
Pulse waveform should be able to effectively be simulated the common surge pulse waveform in the actual use of fuse circuit.The surge current waveform of circuit is various, is likely sine wave, triangular wave, sawtooth wave ... Deng, its energy can Equivalent Calculation.According to the surge pulse waveform on satellite, the pulse waveform of the present embodiment is selected square wave.
Pulse peak current should be in conjunction with the real work current standard of the pulse peak current in fuse real work circuit and derate use; Or set according to half of the pulse peak current in fuse real work circuit.Surge current peak value on satellite mostly is 5～6 times of rated current, and therefore, the pulse peak current of the present embodiment is selected 3 times of rated current.
Duration of pulse is 1/2 of fuse trip time, in the situation that having determined that pulse peak current is selected 3 times of rated current, when determining the duration of pulse, should first determine pulse peak current, duration of pulse is generally taken under this pulse peak current effect, test specimen trip time 1/2 or less.So in this test, we are applying pulse peak current 3 times of rated current in the situation that to test specimen, carry out the required duration of pulse of confirmed test.Obtain the theoretical duration of pulse by above principle after, also to consider the restriction of the actual fan-out capability of testing equipment simultaneously, can it realize desired pulse level.So under considering, getting the duration of pulse in this test is 10ms.
As previously mentioned, exist moment during surge pulse current in circuit, fuse blows process is equivalent to an adiabatic system, there is no thermal loss, so our hypothesis is in the situation that making melt fusing here, the heat that melt produces is all for the consumption of electric flux.Known surge I
2t=a * Ip
2t, wherein Ip is pulse peak current, a=1(square wave in this test), Ip is 3 times of rated current.The cumlative energy of supposing pulse is 22% of fuse melting heat energy, so MeltingI
2t=surge I
2t/22%.For simplicity, with regard to individual pulse,
(surge I
2t/22%) R=I
d 2rT
Wherein, R is melt resistance at normal temperatures, I
dfor the electric current of the fuse of flowing through, T is the recurrence interval.Formula is tried to achieve the recurrence interval and is on average about 2s thus, for warranty test sample has the enough heat radiation time in continuous impulse effect gap, need to be multiplied by a scale factor to the recurrence interval of trying to achieve, in this test, scale factor gets 5, so the final confirmed test recurrence interval is 10s.
Recurrence interval definite be can mimic channel in actual surge current ultimate limit state, can make again test specimen have the enough heat radiation time in continuous impulse effect gap.Under comprehensive, the recurrence interval of the present embodiment is 10s.
Therefore the parameter of determining the present embodiment is as shown in table 3.
Table 3 test pulse parameter
| Pulse waveform | Square wave |
| Pulse peak current | 3 times of rated current |
| Duration of pulse | 10ms |
| Recurrence interval | 10s |
Step 4: sample is connected in test circuit, and test circuit comprises monitor portion, current-limiting resistance, electronic load and power supply, and described monitoring comprises monitor oscilloscope and sample resistance; Sample resistance, current-limiting resistance, electronic load, power supply closed loop in series, described monitor oscilloscope is connected in parallel on sample resistance, and described electronic load is used for producing surge pulse, and described monitor oscilloscope is used for monitoring sample; According to definite parameter in step (3), test, take every 10,000 times as an examination point, after sample is cooling, it is carried out to outward appearance and mechanical verification, measure its resistance, voltage drop and calculate resistance varying-ratio, good each sample data of record, till sample need be accomplished fusing;
Test is used continuous square pulse electric current to carry out surge to the sample of test group, and the pulse parameter of employing is as shown in table 3.Requiring every is for 10,000 times an examination point, treats that sample is cooling, and it is carried out to outward appearance and mechanical verification, measures operating chacteristics, resistance varying-ratio, voltage drop, and good each sample data of record.Till each sample need be accomplished fusing, pulse number is at least 100,000 times.For the ease of analyzing test data, the process schematic diagram of test as shown in Figure 4.Test data is made into form as shown in table 4, and the resistance varying-ratio of each model of test group is made to chart, as shown in Fig. 5,6,7,8.
Table 4 surge pulse test data
Step 5: analyzing test data is obtained a result
Test data shows:
M1206F-S-125-5.0 model #15 and #24 sample have completed 100,000 subpulse tests at present, and indices is within regulation and stipulation scope; #5 sample is opened a way when 67200 subpulse;
SF12L-125-5.0 model # 4 and #9 sample are opened a way respectively when 11956 times and 13696 subpulse; #25 sample is opened a way at 70000 times;
M1206F-S-125-1.0 model # 4 and #7 sample are all opened a way when 50000 subpulse, and #2 sample is opened a way at 61200 times;
Three samples of SF12L-125-1.0 model are ten thousand 100,000 subpulse tests all, and indices all meets code requirement.
Portioned product is not by 100,000 300% overcurrent pulse tests, and after little current specimen pulse, resistance varying-ratio basic controlling is in 2%, and interpret sample is comparatively stable.And As time goes on, large current specimen resistance varying-ratio fluctuation is larger, degree of stability and aging are to be improved.
From Fig. 5, Fig. 6, Fig. 7, Fig. 8, observed, for little current specimen, plug-in type sample SF12L-125-1.0 is at every resistance varying-ratio after 10,000 subpulse rush of currents substantially in 2%, and sample is not opened a way; And for surface-mount type sample M1206F-S-125-1.0, when its resistance varying-ratio approximately exceeds 1%, sample just can be opened a way;
For large current specimen, comprise plug-in type SF12L-125-5.0 and surface-mount type M1206F-S-125-5.0, when the absolute value of its resistance varying-ratio approximately exceeds 4%, sample just can be opened a way.
Result shows that this testing program is reasonably feasible, test findings and data for searching fuse q&r problem, improve Design and manufacture level and there is certain directive function, for the design of Reducing Rating of product provides foundation; For the formulation of the Failure Assessment standard of surge pulse limit evaluation test provides foundation.Can test out accurately the ability of the antisurge pulse current of fuse, for whether measurement fuse can sustain a certain amount of rush of current, provide scientific basis, for the Rational choice of fuse provides scientific guidance, eliminate and choose improper causing damage because of fuse; Contribute to shorten the design cycle of fuse production firm simultaneously and reduce maintenance cost.
The electric current that the present invention initially carries out fall-of potential test to tested fuse sample is the rated current of fuse sample, and energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.Can make the data of test more accurate, be convenient to fuse to make the judgement of science.
Step of the present invention, in carrying out the process of surge pulse, is detecting it after tested fuse is cooling, can eliminate the change of Yin Wendu and cause the inaccurate of test data, can accurately test out the ability of antisurge pulse current.
Claims (8)
1. a method of testing fuse antisurge pulse current, comprises the following steps:
(1) the fuse sample of choosing is carried out to electrical testing, electrical testing comprises fall-of potential test and resistance test;
(2) sample is divided into contrast groups and test group; Test group will apply surge pulse waveform electric current, and contrast groups is for contrasting with test group;
(3), according to the working line of fuse, determine the surge pulse waveform current parameters applying; Described parameter comprises pulse waveform, pulse peak current, duration of pulse and recurrence interval;
(4) sample is connected in test circuit, described test circuit comprises monitor portion, current-limiting resistance, electronic load and power supply, and described monitoring comprises monitor oscilloscope and sample resistance; Sample resistance, current-limiting resistance, electronic load, power supply closed loop in series, described monitor oscilloscope is connected in parallel on sample resistance, and described electronic load is used for producing surge pulse, and described monitor oscilloscope is used for monitoring sample; According to definite parameter in step (3), test, take every 10,000 times as an examination point, after sample is cooling, it is carried out to outward appearance and mechanical verification, measure its resistance, voltage drop and calculate resistance varying-ratio, good each sample data of record, till sample need be accomplished fusing;
(5) analyzing test data is obtained a result.
2. the method for test fuse antisurge pulse current according to claim 1, it is characterized in that: the electric current of the fall-of potential test in described step (1) is the rated current of fuse sample, energising a period of time treats that voltage drop is stable, sample is carried out to 100% fall-of potential test.
3. the method for test fuse antisurge pulse current according to claim 1, is characterized in that: described pulse waveform should be able to effectively be simulated the common surge pulse waveform in the actual use of fuse circuit.
4. the method for test fuse antisurge pulse current according to claim 1, is characterized in that: described pulse peak current should be in conjunction with the real work current standard of the pulse peak current in fuse real work circuit and derate use; Or set according to half of the pulse peak current in fuse real work circuit.
5. the method for test fuse antisurge pulse current according to claim 1, is characterized in that: the described duration of pulse be the fuse blows time 1/2 or according to definite pulse peak current, determine.
6. the method for test fuse antisurge pulse current according to claim 1, it is characterized in that: described recurrence interval definite be can mimic channel in actual surge current ultimate limit state, can make again test specimen have the enough heat radiation time in continuous impulse effect gap.
7. the method for test fuse antisurge pulse current according to claim 1, is characterized in that: the resistance of described sample resistance is 0.1 Ω.
8. the method for test fuse antisurge pulse current according to claim 1, is characterized in that: described current-limiting resistance is that range of adjustment is the rheochord of 0-1 Ω, the pulse current value being used in regulating circuit.
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| CN201310401352.3A Pending CN103558461A (en) | 2013-09-06 | 2013-09-06 | Method for testing surge pulse current resistance of fuse |
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| CN105785222A (en) * | 2016-04-01 | 2016-07-20 | 中国振华集团云科电子有限公司 | Plug-in fuse secondary quick screening method |
| CN107703444A (en) * | 2017-09-08 | 2018-02-16 | 北京空间飞行器总体设计部 | A kind of acquisition methods of magnetic latching relay surge current safety curve |
| CN107861035A (en) * | 2017-11-06 | 2018-03-30 | 中国振华集团云科电子有限公司 | Fuse performance detection means and method |
| CN109313229A (en) * | 2016-06-20 | 2019-02-05 | 伊顿智能动力有限公司 | For detecting the monitoring system and method for the thermomechanical strain fatigue in electrical fuse |
| CN109342800A (en) * | 2018-11-29 | 2019-02-15 | 贵州航天计量测试技术研究所 | A kind of calibrating installation and calibration method of pulse plating power pulse current |
| CN111257801A (en) * | 2020-01-22 | 2020-06-09 | 西北核技术研究院 | Equivalent checking method and equivalent predicting method for current-carrying life of pulse fuse operated at repetition frequency |
| CN113985323A (en) * | 2021-10-29 | 2022-01-28 | 中国振华集团云科电子有限公司 | Method and device for rapidly testing fuse fusing characteristic of fuse-element fuse |
| CN118091520A (en) * | 2024-04-17 | 2024-05-28 | 深圳市华科智源科技有限公司 | Intelligent regulation and control method and system for 10us square wave surge testing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105785222A (en) * | 2016-04-01 | 2016-07-20 | 中国振华集团云科电子有限公司 | Plug-in fuse secondary quick screening method |
| CN109313229A (en) * | 2016-06-20 | 2019-02-05 | 伊顿智能动力有限公司 | For detecting the monitoring system and method for the thermomechanical strain fatigue in electrical fuse |
| CN107703444A (en) * | 2017-09-08 | 2018-02-16 | 北京空间飞行器总体设计部 | A kind of acquisition methods of magnetic latching relay surge current safety curve |
| CN107861035A (en) * | 2017-11-06 | 2018-03-30 | 中国振华集团云科电子有限公司 | Fuse performance detection means and method |
| CN109342800A (en) * | 2018-11-29 | 2019-02-15 | 贵州航天计量测试技术研究所 | A kind of calibrating installation and calibration method of pulse plating power pulse current |
| CN111257801A (en) * | 2020-01-22 | 2020-06-09 | 西北核技术研究院 | Equivalent checking method and equivalent predicting method for current-carrying life of pulse fuse operated at repetition frequency |
| CN111257801B (en) * | 2020-01-22 | 2021-12-24 | 西北核技术研究院 | Equivalent checking method and equivalent predicting method for current-carrying life of pulse fuse operated at repetition frequency |
| CN113985323A (en) * | 2021-10-29 | 2022-01-28 | 中国振华集团云科电子有限公司 | Method and device for rapidly testing fuse fusing characteristic of fuse-element fuse |
| CN113985323B (en) * | 2021-10-29 | 2023-12-19 | 中国振华集团云科电子有限公司 | Method and device for rapidly testing fuse melt fusing characteristics of wire-shaped fuse |
| CN118091520A (en) * | 2024-04-17 | 2024-05-28 | 深圳市华科智源科技有限公司 | Intelligent regulation and control method and system for 10us square wave surge testing equipment |
| CN118091520B (en) * | 2024-04-17 | 2024-06-25 | 深圳市华科智源科技有限公司 | Intelligent regulation and control method and system for 10us square wave surge testing equipment |
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