CN103713265B - A kind of burn-in detection system - Google Patents
A kind of burn-in detection system Download PDFInfo
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- CN103713265B CN103713265B CN201310739259.3A CN201310739259A CN103713265B CN 103713265 B CN103713265 B CN 103713265B CN 201310739259 A CN201310739259 A CN 201310739259A CN 103713265 B CN103713265 B CN 103713265B
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Abstract
The present invention provides a kind of burn-in detection system, and it crosses replacing keyset, backboard and load board can be with the different types of power module of ageing.The keyset of the present invention is loaded into the load in load board on measurand by backboard；AD collector gathers the voltage data of measurand by keyset and is sent to single-chip microcomputer, and the humiture Data Concurrent that humiture collection device gathers load board gives single-chip microcomputer；Single-chip microcomputer obtains monitoring result after carrying out signal transacting to the humiture data receiving and voltage data, is transmitted to display and shows；And monitoring result alarm range is set, when testing result exceeds alarm range, send alarm command and trigger alarm.The mode of native system artificial manual test before instead of application, efficiency has obtained large increase, and has loaded and can change flexibly as required.Add voltage signal, load temperature built-in self testing, report to the police at once when breaking down.Human resources are liberated, it is to avoid artificial participation increases uncertain factor.
Description
Technical field
The invention belongs to power device field tests, particularly relate to a kind of burn-in detection system.
Background technology
Power supply unit is always various test system, the necessary component of test equipment, therefore this parts
Reliability is the most important thing of each system, equipment.Whether reliability level can reach design objective, needs
By reliability screening verification experimental verification.Old mine pit test is the main project of reliability screening, and its purpose is just
It is intended to, by applying suitable temperature stress and electric stress to test specimen, expose the work event of test specimen to greatest extent
Barrier.
In batch production, owing to power supply product species is many, interface shape is many, aging test needs to use multiple
Tester equipment, relies on and manually builds ageing test platform, artificial fixed time test, and manual record tests number
According to etc., inefficient.
Content of the invention
For solving the problems referred to above, the present invention provides a kind of burn-in detection system, by setting the innovation of built-in system
The wiring of meter and critical component sets, and has voltage and epidemic disaster prison while ageing high-power signal
Surveying and display function, and having fault alarm function concurrently, automatic test degree is high, can substitute manual operation,
Improve aged test efficiency.
A kind of burn-in detection system of the present invention, comprising: load board, backboard, keyset, AD collector,
Humiture collection device, alarm, display and single-chip microcomputer；
Wherein single-chip microcomputer uses MSP430F149 single-chip microcomputer, and humiture collection device uses SHT15 temperature and humidity sensing
Device, display uses WYM128128C LCD screen；
Annexation is as follows: load board is connected by 96 core connectors with backboard；Keyset passes through 128 with backboard
Core connector connects；Keyset is connected with measurand；AD collector is connected with keyset；Single-chip microcomputer is respectively
It is connected with AD collector, humiture collection device, alarm, display；
Job step is as follows:
Step 1, keyset is loaded into the load in load board on measurand by backboard；
Step 2, AD collector gathers the voltage data of measurand by keyset and is sent to single-chip microcomputer,
The humiture Data Concurrent that humiture collection device gathers load board gives single-chip microcomputer；
Step 3, single-chip microcomputer obtains monitoring knot after carrying out signal transacting to the humiture data receiving and voltage data
Really, it is transmitted to display to show；And monitoring result alarm range is set, when testing result is beyond warning
During scope, send alarm command and trigger alarm；
Further, described load board, backboard, the internal wiring of keyset meet claimed below: wire leads to
Overcurrent I meets I≤K*T*A*0.033, and wherein K is correction factor, and T is the maximum temperature rise of wire, A
For wire cross-section area；According to formula
Determining length L of parallel wire in wire, wherein Ris is the minimum insulation resistance of wire, and W is the cloth of wire
Distance between centers of tracks, T passes through the time.
Further, described single-chip microcomputer is provided with serial line interface, by single-chip data after level conversion, logical
Cross RS232 interface and compunication, carry out associative operation by the control of computer.
Further, described K takes 0.023 covering when copper cash is positioned at internal layer, takes 0.047 during outer layer.
The beneficial effects of the present invention is:
1. the internal wiring of load board, backboard, keyset is devised by great many of experiments and creativity work
Wire requires, decreases the error of ageing test, improves the efficiency of aged test, increase seasoned system
Service life, decrease testing cost.
2. there is while ageing high-power signal voltage and epidemic disaster monitoring and display function, and have concurrently
Fault alarm function, automatic test degree is high, can substitute manual operation, improve aged test efficiency.
3. load can be changed as required flexibly, can be dc source, AC power, high-power analog quantity
Output products provides load.
Brief description
Fig. 1 is the burn-in detection system fundamental diagram of the present invention；
Fig. 2 is the burn-in detection system structural representation of the present invention.
Detailed description of the invention
Fig. 1 is the burn-in detection system fundamental diagram of the present invention.In figure, single-chip microcomputer uses MSP430F149 mono-
Piece machine is as microcontroller, and this single-chip microcomputer is in core status in systems, is used for receiving humiture collection device
The humiture data collecting, and the voltage data that AD collector collects, will monitoring after signal transacting
Result is transferred to display.And Monitoring Data alarm range can be set by programming, if the number monitoring
According to the scope exceeding setting, single-chip microcomputer can trigger alarm command to alarm.Single-chip microcomputer is provided with serial communication and connects
Mouthful, by single-chip data after level conversion, by RS232 interface and compunication, can will calculate
Machine carries out associative operation as terminal device.
AD collector is mainly Real-time Collection voltage signal, mainly employs the skill such as digital-to-analogue conversion and scanning switch
Art, its internal structure mainly includes Multipexer selector, gain-programmed amplifier, A/D converter, D/A
Converter, voltage reference, FIFO memory, control logic unit etc..Be applied to multi channel signals,
At a high speed, the occasion of high-accuracy data acquisition.
Humiture collection device uses SHT15 Temperature Humidity Sensor, gathers 4 loads respectively with 4 SHT15
It is simultaneously sent in single-chip microcomputer by the humiture data of plate by data wire.
Display uses WYM128128C LCD screen display output information, this display screen volume is little,
Low in energy consumption, show abundant in content.By programming display 8 row, often 8 middle words of row or 16 ASC II words
Symbol, point four screens are shown the voltage of each load board, temperature and humidity data respectively, and are controlled by button
Display page turning.
Load board layout: consider load resistance heating problem, by heat radiation simulation system software
(flotherm) rational deployment of the minimum ohmic load of the temperature that, makes system heat generation cause.High-power electricity
The mode of source ageing 2 or 3 resistor coupled in parallel of employing avoids the single small resistor of employing and causes local to dispel the heat
The too high problem of big temperature.Load board is docked by 96 core connectors with backboard.
Backboard uses thickening formula backboard pattern, prevents stress excessive and produces circuit board deformation, is used for passing simultaneously
Pass signal between keyset and load board.
Keyset be used for and tested power panel card docking, keyset can carry out simultaneously 28 road power supply signal ageings and
Test, by the brightness of diode, keyset reflects whether the 28 road power supply outputs that power supply exports are correct.
Keyset is connected with backboard by 128 core connectors.
Power supply is placed on after backboard, can be changed different power supply adaptors according to different by ageing object.
Native system can also arrange radiator portion, and this radiator portion uses Flotherm software to carry out heat emulation,
Native system and instrument are dispelled the heat by the mode using air blast.The quantity of fan and power are according to different ageings
Object selects.Operationally, the temperature making printed circuit board is less than 70 DEG C, can hold less than printed board
The temperature (260 DEG C) being subject to；Internal temperature peak, at load resistance, is 88 DEG C, is less than the specified of this resistance
Use temperature (150 DEG C), meet use and require.
Cabinet housing is the agent structure of system, physical dimension (high × wide × deep)
352mm × 424.5mm × 631mm, color is white.
Fig. 2 is the burn-in detection system structural representation of the present invention.As in figure 2 it is shown, this ageing detection device
Including: the 5th, supply unit the 1st, alarm the 2nd, humiture collection device the 3rd, single-chip microcomputer the 4th, cabinet housing transfers
Plate the 6th, AD collection plate the 7th, single-chip microcomputer the 8th, display the 9th, backboard the 10th, load board the 11st, heat abstractor 12；
Cabinet housing 5 is agent structure, is used for placing miscellaneous part.Supply unit 1 is connected with measurand, with
When measurand is powered, keyset 6 is connected with measurand, and keyset 6 is according to different tested
Object is designed, and backboard 10 is used for transmitting the signal that keyset 6 arrives between load board 11, passes through respectively
Fixing connector is connected with keyset 6 and load board 11, and load board 11 is joined according to different measurands
Put corresponding load.Humiture collection device 3 is used for transmitting epidemic disaster signal, and AD collection plate 7 is used for gathering
Voltage signal and epidemic disaster signal, will gather data real-time in display 8(liquid crystal by monolithic machine 8
Display screen) upper display.Alarm 2 is connected with monolithic machine 8, data not pair when buzzer warning.Heat radiation
Device 12 is placed on the side of cabinet housing 5, dispels the heat system.
Keyset, backboard and load board internal PCB layout rule, sets according to GB4588.3-88 standard
Meter and use.Specific design thinking is as follows:
1. insulaion resistance and its hygroscopicity in view of insulator have substantial connection, with the increase of humidity, insulation
Surface can form water membrane, thus affects heat radiation.Investigate the impact on electric current for the ambient humidity, at 60 DEG C
Test data such as table 1 under temperature environment.
Table 1
According to test the data obtained, sum up the formula of live width and electric current under the conditions of relative humidity 80%:
I≤K*T*A*0.033
K is correction factor, typically covers copper cash and takes 0.023 when internal layer, takes 0.047 when outer layer；
T is maximum temperature rise, unit for degree Celsius, the fusing point of copper is 1060 DEG C,；
A amasss for covering copper face, and unit is square mil；
I is the maximum current allowed, unit is the general 10mil=0.010inch=0.254mm of ampere (amp),
Can be 1A, 250mil=6.35mm, be 8.3A.
In PCB design processing, conventional OZ is as the unit of copper sheet thickness, and 1OZ copper thickness is defined as 1 square
In foot area, the weight of Copper Foil is 1 big belly, and corresponding physical thickness is 35um, and 2OZ copper is thick is 70um.
In function above board design process ,+3.3V and+5V circuit overcurrent are respectively 9.1A and 6A, PCB
In+5V circuit design principle: calculating live width according to formula is 100mil, copper thick for 2OZ when, overcurrent
For 6A；+ 3.3V circuit design principle: live width is 250mil, when copper thickness is for 1OZ, overcurrent is 8.3A,
Live width is 250mil, and when copper thickness is for 2OZ, overcurrent is 15A, and+3.3V circuit needs overcurrent 9.1A, selects
The latter's design.Both the above line voltage distribution overcurrent is bigger, follows design redundancy principle during design,
So selecting layers of copper to use the exposed wire laying mode of layers of copper, exposed layers of copper applying last layer again and is more than 70um
The scolding tin of thickness, it is ensured that the reliability of pcb board.
2. the data according to actual test statistics, wire pitch is the pressure generally 150V of 0.254mm.Root
Between according to GB/T4588.3-2002 " design and use of printed board " standard center line, insulaion resistance calculating formula is
Ris=160 × Rmat × (W/L) (1)
Ris: the minimum insulation resistance between selected wire；
Minimum insulation resistance at the specified temperature in copper foil base material standard is covered in Rmat: printed board, and also referred to as top layer is exhausted
Edge resistance；
The spacing of W: wire；
The length of L: parallel wire.
The general minimum 1000M Ω of top layer insulaion resistance (Rmat).Make actual in view of burn-in detection system
The impact on board dielectric resistance for the humidity factor in, investigation surface insulation resistance of doing experiment becomes with humidity
The rule changed, data are as shown in table 2.
Table 2
| Humidity | Sample one | Sample two | Sample three |
| 20% | 2605MΩ | 2544MΩ | 2432MΩ |
| 40% | 1287MΩ | 1220MΩ | 1207MΩ |
| 60% | 590MΩ | 568MΩ | 552MΩ |
| 80% | 326MΩ | 318MΩ | 300MΩ |
Illustrate that ambient humidity increases, considerable influence can be produced to surface insulation resistance.It is 0.254mm at distance between centers of tracks
When, humidity often increases by 20%, and insulaion resistance about declines 30%～50%.
Increase distance between centers of tracks to after 0.508mm, then test, such as table 3.
Table 3
| Humidity | Sample one | Sample two | Sample three |
| 20% | 3612MΩ | 3823MΩ | 3734MΩ |
| 40% | 1983MΩ | 1930MΩ | 1978MΩ |
| 60% | 1190MΩ | 1080MΩ | 1128MΩ |
| 80% | 526MΩ | 538MΩ | 520MΩ |
Meet more than the requirement of 500M insulaion resistance, by interior humidity acquisition module test environment humidity, when
When humidity is close to 80%, prompting user avoids the signal using high voltage differential to carry out ageing test as far as possible.
At the working limit temperature 60 C of system design, under the environmental model of relative humidity 80% to circuit board not
With the insulaion resistance change founding mathematical models of time, statistics such as table 4.
Table 4
| T: time/h | Rmat: insulaion resistance/M Ω |
| 0 | 300 |
| 50 | 425 |
| 100 | 355 |
| 150 | 302 |
| 200 | 255 |
| 205 | 198 |
| 300 | 160 |
| 350 | 134 |
| 400 | 105 |
| 450 | 94 |
| 500 | 86 |
Carry out mathematical modeling to try to achieve top layer insulaion resistance and calculate formula:
Merging formula (1) and formula (2):
Wherein Ris: the minimum insulation resistance between wire；
The spacing of W: wire；
L: the length of the parallel wire in wire.
T: the time
For ensureing that the minimum insulation resistance (Ris) between wire is more than 500M Ω, when circuit board wiring, line
Spacing should be maintained at 0.508mm, calculates at temperature 60 C according to formula (3), the ring of relative humidity 80%
Border parallel wire length is no longer than 52.8mm.Certain redundancy should be left when board design, therefore
When wiring, parallel wire length is no longer than 50mm.
3., for clear and definite environmental requirement, the standard atmosphere condition of electric connector megger test has clearly inner
Regulation: temperature: 25 DEG C ± 10 DEG C;Relative humidity: 20%～80%.For checking temperature and humidity to electrical connection
The influence degree of device insulaion resistance, has carried out tests below.Electric connector insulating materials used is that PBT is (poly-right
Diol ester determined by phthalic acid), mainly test insulaion resistance between points, code requirement insulaion resistance >=
2000MΩ.Insulaion resistance varies with temperature inconspicuous, then more sensitive to relative humidity variations, for examining
Examine the impact on insulaion resistance for the humidity change, be the such as table 5 of test data in the environment of 60 DEG C in temperature.
Table 5
| Relative humidity | Insulaion resistance 1 (M Ω) | Insulaion resistance 2 (M Ω) | Insulaion resistance (M Ω) |
| 40% | 1.1×106 | 1.08106 | 1.12×106 |
| 50% | 1.46×105 | 1.48×105 | 1.47×105 |
| 60% | 5.02×104 | 5.05×104 | 5.04×104 |
| 70% | 1.92×104 | 1.94×104 | 1.97×104 |
| 80% | 4.96×103 | 4.97×103 | 4.94×103 |
Data show that, in the environmental condition affecting electric connector insulaion resistance, relative humidity is to insulaion resistance shadow
Ring relatively big, but meet insulaion resistance specified in standard >=2000M Ω and require, therefore in electric connector type selecting
In, as long as choosing the electric connector of insulaion resistance >=2000M Ω, i.e. can ensure that burn-in detection system is high at high temperature
Electric property under wet working environment.
Certainly, the present invention also can have other various embodiments, in the feelings without departing substantially from present invention spirit and essence thereof
Under condition, those of ordinary skill in the art work as and can make various corresponding change and deformation according to the present invention, but
These change accordingly and deform the protection domain that all should belong to appended claims of the invention.
Claims (3)
1. a burn-in detection system, it is characterised in that include: load board, backboard, keyset, AD
Collector, humiture collection device, alarm, display and single-chip microcomputer；
Single-chip microcomputer uses MSP430F149 single-chip microcomputer, and humiture collection device uses SHT15 Temperature Humidity Sensor,
Display uses WYM128128C LCD screen；
Annexation is as follows: load board is connected by 96 core connectors with backboard；Keyset passes through 128 with backboard
Core connector connects；Keyset is connected with measurand；AD collector is connected with keyset；Single-chip microcomputer is respectively
It is connected with AD collector, humiture collection device, alarm, display；
Job step is as follows:
Step 1, keyset is loaded into the load in load board on measurand by backboard；
Step 2, AD collector gathers the voltage data of measurand by keyset and is sent to single-chip microcomputer,
The humiture Data Concurrent that humiture collection device gathers load board gives single-chip microcomputer；
Step 3, single-chip microcomputer obtains detection knot after carrying out signal transacting to the humiture data receiving and voltage data
Really, testing result is transferred to display to show；And testing result alarm range is set, when testing result surpasses
When going out alarm range, send alarm command and trigger alarm；
Further, described load board, backboard, the internal wiring of keyset meet claimed below: wire leads to
Overcurrent I meets I≤K*T*A*0.033, and wherein K is correction factor, and T is the maximum temperature rise of wire, A
For wire cross-section area；According to formula
Determining length L of parallel wire in wire, wherein Ris is the minimum insulation resistance of wire, and W is the cloth of wire
Distance between centers of tracks, t is the time of passing through.
2. burn-in detection system as claimed in claim 1, it is characterised in that described single-chip microcomputer is provided with serial
Interface, by single-chip data after level conversion, by RS232 interface and compunication, by meter
The control of calculation machine carries out associative operation.
3. burn-in detection system as claimed in claim 1, it is characterised in that described K is positioned at covering copper cash
Take 0.023 during internal layer, during outer layer, take 0.047.
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| CN105487019A (en) * | 2016-01-07 | 2016-04-13 | 航天科工防御技术研究试验中心 | High-power power source module aging method and system |
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| CN114076859A (en) * | 2020-08-18 | 2022-02-22 | 中国科学院国家空间科学中心 | Full-temperature aging test system and method for core components for aerospace |
| CN113724746A (en) * | 2021-07-21 | 2021-11-30 | 北京兴汉网际股份有限公司 | Method for heating hard disk based on PCB winding |
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