CN106197793A - The on-line monitoring method of unmanned boat electronic device - Google Patents

Abstract

The present invention provides the on-line monitoring method on unmanned boat under temperature stress test condition, the method of the lower electronic device of temperature stress test on unmanned boat, it is made up of following steps: 1. described selected device (4) is placed in several tests PCB (2), it is then placed in having in the described climate box (1) of two separate chamber (1 1,1 2)；2. the most mobile selected device (4) between two chambers (1 1,1 2)；3., under described in, selected device (4) is periodically exposed to the temperature shock of 40 DEG C to+125 DEG C, time interval is 30 minutes；4. the data of temperature sensor (3) are read by on-line monitoring equipment (5)；5. derived resolution sizes by the A/D converter resolution used, and compare with standard figures；6. on-line monitoring equipment (5) uses RS232 communication to connect (9) and computer carries out communication, and computer 7. uses LabView program-control test to arrange, and internet communication remotely monitors experimentation.This test of described method reflection test component problem can be more accurate, and the required time is more shorter than prior art.

Description

The on-line monitoring method of unmanned boat electronic device

Technical field

The present invention relates to on-line monitoring assembly and the method for electronic device on unmanned boat, should particularly to unmanned vessel temperature The on-line monitoring assembly of the electronic device under power test and method.

Background technology

For manufacturing the IC chip (IC) on unmanned boat, within 2002, Europe a kind of new conduct directiveness of proposition is former Then, i.e. 2002/95/EG (RoHS), this principle makes electronics industry change its production line it is thus possible to guide pb-free solder technique. Electronic device is carried out the consumption that periodic temperature stress test requirement test resource is the biggest, particularly disappearing on the testing time Consumption, is the most just provided that effective life cycle data with statistical significance.In the case of other, still can use phase Some same electronic devices, these devices of pb-free solder technique at a relatively high temperature do not have ability to bear.Therefore, this Abandoning of device can be caused, can only be by individually preventing from reducing probability of happening with crucial device by it.Because mainly leading to Crossing and have been manually done, therefore production cost is the highest.It is therefore desirable to find all of critical component and identify each parts Failure probability.Generally, lead-free solder requires that peak temperature is about 30K, and this will be high than the temperature of any conventional solder. Comparison with typical solders illustrates as shown in Figure 1.Use new European guidance standard 2002/95/EG, prohibit the use of containing lead welding Material.Therefore, electronics industry requires to use lead-free solder.Accompanying drawing 1 explicitly indicates that two kinds of conventional solder and a kind of lead-free solder are in work Comparison in skill.

But, not all corresponding device can be substituted with the suitable device of other higher welding temperatures.Especially It is in unmanned boat field, and its device is mostly dedicated custom device, therefore there is a kind of demand, it is to avoid occur extra Select solder, and during flow process, weld all devices process as an alternative.And periodically stop test Time cost is too high.Therefore, on-line monitoring assembly and the method for a kind of unmanned boat device are developed.It measures surveyed element at weather Selected feature in case.

Summary of the invention

Main target the most of the presently claimed invention is to provide electronic device on a kind of unmanned boat to test in temperature stress Under the conditions of on-line monitoring assembly.On-line monitoring assembly is by the climate box adapted on unmanned boat, and several test PCB, choosing Determining assembly and have the on-line monitoring equipment of measuring circuit, computer, multiplexer and communication connect composition, its mesoclimate Case has two independent chambers, and each test PCB has a temperature sensor, and selected device is placed on test PCB, Measuring circuit is operated under parasite power pattern.

Preferably, on-line monitoring equipment is connected control by computer by RS232.

Preferably, selected device is four kinds of different types of devices to be monitored: capacitor, resistor, inductance and LED.

Preferably, selected device periodic exposure is under the temperature shock of-40 DEG C to+125 DEG C, and time interval is 30 points Clock.

Preferably, temperature sensor is Maxime integrated products DS18B20U, and each temperature sensor has uniqueness 64 bit address, and can be individually accessed.

Preferably, communication connects through one-wire interface or four-wire measurement interface completes.

Preferably, measuring circuit is made up of four parts: power supply, multiplexer, discharge circuit and measuring circuit.Wherein electricity Source includes two current sources and a voltage source.

Preferably, a switch-back is shared in selected device and temperature sensor.

Preferably, have six groups of devices, often four devices of group and a temperature sensor, 84 surveys are installed in climate box Examination PCB.

Therefore, another object of the present invention is for providing temperature stress test on a kind of on-line monitoring unmanned boat lower electronics device The method of part, it is made up of following steps:

(1) selected device is placed on several tests PCB, is then placed in the climate box with two separate chamber In；

(2) periodic mobile example between two chambers；

(3), under device is periodically exposed to the temperature shock of-40 DEG C to+125 DEG C, time interval is 30 minutes；

(4) data of temperature sensor are read by on-line monitoring equipment；

(5) derived resolution sizes by the A/D converter resolution used, and compare with standard figures；

(6) on-line monitoring equipment uses RS232 communication connection and computer to carry out communication, and computer uses LabView journey Sequence Control experiment is arranged, and internet communication remotely monitors experimentation.

In embodiments of the invention, design, build and test hardware device.Current test PCB is arranged in climate box.

As experimental result, present invention contemplates that the negative correlation between thoughtful solder temperature and monitored equipment life cycle Property, simultaneously it is also expected to find the information about two chamber indoor temperature distribution.

The test condition that device disclosed by the invention is, such as pressure, all the time frequency etc. and normal actual operating conditions Identical, the working condition of traditional product is the test device directly heating on plank by heater.And this test is only Being the unmanned boat test of individually testing device, each pin of chip needs in the case of bandwidth channel exists tested.Therefore This test reflection test component problem can be more accurate, and the required time is more shorter than prior art.It addition, the adding of device Hot device is less than prior art, thus tests cost of energy and reduce.

According to below in conjunction with the accompanying drawing detailed description to the specific embodiment of the invention, those skilled in the art will be brighter Above-mentioned and other purposes, advantage and the feature of the present invention.

Accompanying drawing explanation

Describe some specific embodiments of the present invention the most by way of example, and not by way of limitation in detail. Reference identical in accompanying drawing denotes same or similar parts or part.It should be appreciated by those skilled in the art that these Accompanying drawing is not necessarily drawn to scale.In accompanying drawing:

[Fig. 1] is according to the typical solders comparison diagram of prior art.

[Fig. 2] measurement apparatus structure chart according to an embodiment of the invention.

[Fig. 3] is according to the test PCB circuit of the multiple embodiment of the present invention.

The circuit fundamental diagram that [Fig. 4] develops according to the multiple embodiment of the present invention.

Detailed description of the invention

The present invention describes following detailed description to the test apparatus and method providing the present invention to understand necessity, but also It is not covered with complete structure composition and theory of operation.The part relevant to conventional art only brief description, and accompanying drawing is also It not the most drawn to scale.Although discussing multiple embodiment, the scope that its purpose is not intended to limit the invention.Remove The non-quantity that device is specially described, it should be understood that the number of devices used may be many than disclosed.

In in enforcement, test device is connected on motherboard, and stress module is connected with test device.Stress module is permissible There is provided reliable stress for test device thus implement this test.Stress module can be heater, and stress is temperature reliably Degree stress, thus heater provides the heat at required or target detection temperature or temperature stress for test device.

Accompanying drawing 2 is the measurement equipment according to one embodiment of the invention.On-line monitoring equipment passes through RS232 communications protocol quilt Computer controls.Four kinds of different devices are had to need monitored: capacitor, resistor, inductance and LED.Equipment is by having two Separate chamber 1-1, the climate box 1 of 1-2, several each test PCB2 above with a temperature sensor 3, it is placed on survey Selected device 4 on examination PCB2, has the on-line monitoring equipment 5 of measuring circuit 6, is operated under parasite power pattern, a meter Calculation machine 7, multiplexer 8 and communication connect 9 compositions.

Selected device 4 is placed on several tests PCB2, is then put into having two separate chamber gesture 1-1,1-2's In climate box 1.Sample is at chamber 1-1, the most mobile between 1-2.During now sample is in test process, temperature can not be known Degree changes in distribution on sample, in order to be better understood from a temperature of which sample is really exposed to, each test PCB has One temperature sensor 3.Temperature sensor 3 is the integrated products of Maxime company, and model is DS18B20U.By on-line monitoring Equipment 5 reads temperature and vertically and is operated under parasite power pattern.Each sensor has 64 unique bit address, therefore Can be individually accessed.Communication is completed by one-wire interface.

Accompanying drawing 3 represents the circuit on test PCB.Having six groups of devices, often four devices of group 4 are plus a temperature sensor 3.All of device 4 is together with the public switch-back of temperature sensor 3, so that the number of cables that climate box 1 stretches out is minimum. 84 pieces of test PCB are installed in climate box 1 altogether.

Accompanying drawing 4 represents the operation principle of developed circuit in the disclosure.Its glaze four part forms: power supply, takes path multiplexer by force 8, discharge circuit and measuring circuit 6.Power supply includes two current sources and a voltage unit.One current source adjustable and being used for As LED power, and another current source is fixed on 80 μ A and for measuring direct current resistance.Circuit can be in device 4 and survey Changing between amount circuit 6, the foundation of conversion is the type of device 4.Circuit feature is to measure resistance, capacitance, inductance Amount and the forward voltage of LED.

Embodiment 1

Measure inductance and electric capacity: inductance and capacitance are charged under a specific resistance value by device 4 and measure this process Time constant determined by.This method is the simplest, it is only necessary to a very simple circuit provides for the most accurate The result of physical quantity variation can be reflected.Under this test case, K3 needs to be closed.Then microprocessor starts corresponding solution Code device, and by address is selected a passage to decoder.Decoder starts T2, the most just can drive p road MOSFET element T1.Then by starting T3 for capacitance measurement or just can close this circuit for inductance measurement startup T5. By known resistance, device is charged, and by waiting until that voltage ADC1 reaches 36.8% or the electricity of 5V under capacitance load Sense load under 5V 63.2%, microcontroller measure system timeconstantτ, use this time constant, pass through equation accordingly And (2) just can readily calculate inductance or electric capacity (1):

$C=\frac{\mathrm{\τ}}{R}---\left(1\right)$

L=τ R (2)

It addition, after time 10 τ, measure the residue DC current by the device under temperature stress test.This can divide Do not provide leakage current for capacitor, provide D.C. resistance for inducer.After measurement, device must be discharged.For capacitor, This is by turning off T3 and starting K4 and complete.By protection diode V1 inductance by automatic discharging.

Embodiment 2

Measure resistance value: for this measurement, provide fixed current 80 μ A, micro-process by starting K3 and T6 for device under test Device obtains resultant voltage at differential A/D converter ADC2, calculates resistance value and numerical value is sent to RS232 connection.

Embodiment 3

By starting K1 and T6, provide the adjustable constant current between 1 to 500mA for LED.Selected electricity in this embodiment Stream 100mA.Then ADC2 measurement is used to fall over each other voltage.It is higher owing to connecting the D.C. resistance of cable between equipment and climate box, Having a great impact measurement result, therefore measured voltage is not the real forward voltage of LED, and and tables of data In numerical value there is non comparability.

So far, although those skilled in the art will appreciate that the multiple of the most detailed present invention of illustrate and describing show Example embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure Determine or derive other variations or modifications of many meeting the principle of the invention.Therefore, the scope of the present invention is it is understood that and recognize It is set to and covers other variations or modifications all these.

Claims (1)

1. the on-line monitoring method of unmanned boat electronic device, it is characterised in that: it is made up of following steps:

(1) described selected device (4) is placed in several tests PCB (2), is then placed in that there are two separate chamber (1- 1,1-2) in described climate box (1)；

(2) the most mobile selected device (4) between two chambers (1-1,1-2)；

(3), under described selected device (4) is periodically exposed to the temperature shock of-40 DEG C to+125 DEG C, time interval is 30 points Clock；

(4) data of temperature sensor (3) are read by on-line monitoring equipment (5)；

(5) derived resolution sizes by the A/D converter resolution used, and compare with standard figures；

(6) on-line monitoring equipment (5) uses RS232 communication to connect (9) and computer carries out communication, and computer (7) uses LabView program-control test is arranged, and internet communication remotely monitors experimentation.