CN109142930A - Headlamp LED drive module design and verification method - Google Patents
Headlamp LED drive module design and verification method Download PDFInfo
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- CN109142930A CN109142930A CN201811017573.XA CN201811017573A CN109142930A CN 109142930 A CN109142930 A CN 109142930A CN 201811017573 A CN201811017573 A CN 201811017573A CN 109142930 A CN109142930 A CN 109142930A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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Abstract
The present invention relates to a kind of headlamp LED drive module design and verification methods, including can test tests exemplar execution basic electric property, the test of big parameter testing, PCB maximum load temperature test, electromagnetic compatibility test and high/low temperature Life Cycle.The basic electric property can be tested including constant current function verifying, the verifying of lighting logic checking, resistance stepping, input terminal voltage test, the protection of external resistive-open are verified, throw load is tested, the test of voltage kick, 7V start and stop test, 6V start and stop test, reset is verified, signal wire and load short circuits test, superposition alternating current test, long-time over-voltage test, the verifying of temperature protection curve, voltage slowly decline slow raising test, anti-reverse verifying and alarming line verifying.The present invention can cover the requirement of major mainstream depot, and the formal test percent of pass of its LED drive module of the design scheme of design verification qualification significantly improves.
Description
Technical field
The present invention relates to a kind of design and verification methods specifically for headlamp LED drive module, make the LED by verifying
Drive module can satisfy the requirement of each mainstream depot (such as upper vapour, masses, a general, vapour, Guangzhou Automobile Workshop etc.) at present, belong to vehicle
Lamp technical field.
Background technique
Different mainstream depots are relevant for headlamp LED drive module at present requires different, causes car light system
It makes enterprise to generally require respectively to be made demands for each depot, carries out design, production and the pipe of headlamp LED drive module respectively
Reason, therefore the economic benefit of car light cost, car light production efficiency and car light manufacturing enterprise is all influenced to different extents.
Summary of the invention
The present invention is intended to provide a kind of headlamp LED drive module design and verification method, can cover major mainstream depot
Requirement, the formal test percent of pass of its LED drive module of the design scheme of design verification qualification significantly improves.
Main technical schemes of the invention have:
A kind of headlamp LED drive module design and verification method, executing basic electric property to tests exemplar can test, the base
This electric performance test includes constant current function verifying, the verifying of lighting logic checking, resistance stepping, input terminal voltage test, external electricity
It hinders open-circuit-protection verifying, throw load test, the test of voltage kick, 7V start and stop test, 6V start and stop test, reset verifying, signal wire
Slowly decline with load short circuits test, superposition alternating current test, long-time over-voltage test, the verifying of temperature protection curve, voltage slow
It is slow to increase test, anti-reverse verifying and alarming line verifying.
The lighting logic checking be make respectively tests exemplar work maximum output voltage, minimum output current state with
And work is tested in minimum output voltage, maximum output current state according to the lighting logic in operation instructions one by one
Verifying.
It further includes overvoltage protection verifying, PIN out of circuit test that the basic electric property, which can be tested, stabilizes the output voltage range survey
Examination, the verifying of high-low pressure Preservation tactics, the verifying of left and right lamp action consistency, light show functional verification, the anti-interference test of starting and electricity
Press moment drawdown test.
The light show functional verification includes the following contents:
(1) circulation lights function:
It needs with the tests exemplar that circulation lights function with turn signal safe mode, it is desirable that disconnected in CLOCK and SPI
When, all LED of turn signal are always on；The tests exemplar for lighting function with circulation needs to verify circle logic, is being recycled to the 3rd
When LED, LED+ is opened a way, is then taken back again, sees whether continue cycling through since the 4th LED；
(2) matrix functions:
Tests exemplar with matrix functions needs to increase single LED holding function, LED from left to right again from right to left by
Sequential illumination, then two LED are from toward both sides sequential illumination one by one, eventually passing back to centre in the middle；Test sample with matrix functions
Part is used on turn signal, needs the turn signal LED all in the case where CAN is disconnected that can all be always on；
(3) respiratory function:
Tests exemplar with respiratory function carries out following breath test:
One circulatory and respiratory 3 times --- > position lamp 1min --- > 3 times --- > daytime running lamps 1min --- > is exhaled for breathing
Inhale --- > position lamp 1min --- > breathing 3 times --- > daytime running lamps 1min, persistent loop 3 times；
The lighting of position lamp requires to be hanging for often electricity, daytime running lamps to position lamp；The lighting requirement of daytime running lamps
It is hanging for often electricity, position lamp to daytime running lamps；Breathe lighting requirement are as follows: when breathing, daytime running lamps are for often electricity, position lamp
The frequency of the duty cycle signals of input is 100HZ；When exemplar with respiratory function does open circuit experiment, removes power supply line and take back again
Afterwards, LED does not allow to flash.
It further preferably includes full power low-voltage high-temperature lighting test that the basic electric property, which can be tested, which is to allow tests exemplar
Work is in maximum power state, and operating voltage is the minimum of tests exemplar, is continued working 10 hours, examines examination
Test whether exemplar is abnormal.
The headlamp LED drive module design and verification method further includes that big parameter testing is executed to tests exemplar, described
Big parameter testing is to test respectively under each state of temperature in room temperature, low temperature and high temperature and record 9V, 14V and 16V electricity
Whether exception, start delay time, starting peak value are electric for input current, output electric current, output voltage, alarm signal when pressure power supply
Stream and failure input current.
The headlamp LED drive module design and verification method further includes executing PCB maximum load temperature to tests exemplar
Test, the PCB maximum load temperature test is each lighting 1h under tri- kinds of supply voltages of 9V, 12V and 18V, records pcb board
Heat condition, the maximum temperature including registering device record the code name and type of this component for the component more than 80 DEG C
Number.
The headlamp LED drive module design and verification method further includes executing high/low temperature Life Cycle to tests exemplar to survey
Examination, the high/low temperature Life Cycle test include switching cycle test, temperature alternating curve test and voltage alternating curve test
Three kinds, length of testing speech 2000h.
The headlamp LED drive module design and verification method further includes executing electromagnetic compatibility test, institute to tests exemplar
Stating electromagnetic compatibility test includes main circuit ripple test, electrostatic discharge testing, the anti-interference test of power supply line transient pulse, high current
Injection test, the anti-interference test of radio frequency, radiation emission test and the test of power supply line conducted emission, wherein the main circuit ripple is surveyed
It studying and is tested for first item, the electrostatic discharge testing and the anti-interference test of power supply line transient pulse successively successively carry out, and
It is completed before remaining four tests, the main circuit ripple test is to be in maximum output in headlamp LED drive module to be measured
In the case where power, switching waveform is measured for the D foot of the DCDC switch metal-oxide-semiconductor of headlamp LED drive module to be measured, test is logical
The standard crossed is that switching waveform generates the high current edge rise time less than 70ns, the ripple voltage peak peak of upper punching and undershoot waveform
Value is both less than 500mV, and the ripple voltage peak-to-peak value of output signal over the ground is less than 90mV.
For the headlamp LED drive module of more than one input port, the electromagnetic compatibility test further includes that port is small
Voltage injection test, the port small voltage injection test is to mention when needing single-point function in another hanging input port
For the supply voltage of 5V, check whether headlamp LED drive module to be measured exception occurs, the port small voltage injection test exists
It is carried out before the electrostatic discharge testing.
The beneficial effects of the present invention are:
Verifying process of the invention and test method can cover the requirement of major mainstream depot, it is possible thereby to using uniformly setting
Meter, unified production and unified management, therefore be conducive to car light manufacturing enterprise and reduce cost, improve production efficiency, improve economic effect
Benefit.
Using verifying process of the invention and test method, be conducive to that the defects of circuit design is determined early, before promotion
Headlight LED drive module design scheme constantly improve, and is conducive to persistently mentioning for the product quality of headlamp LED drive module
It is high.
Found in practice, the design scheme passed through using verification method design verification of the invention, product the later period just
The percent of pass of formula test significantly improves.
Detailed description of the invention
Fig. 1 is the schematic diagram of one embodiment of design and verification method testing scheme of the invention；
Fig. 2 is throw load waveform diagram；
Fig. 3 is voltage kick waveform diagram；
Fig. 4 is the cold start and stop waveform diagram of 7V；
Fig. 5 is the hot start and stop waveform diagram of 7V；
Fig. 6 is 6V start and stop waveform diagram；
Fig. 7 is reset wave schematic diagram；
Fig. 8 is superposition AC wave shape schematic diagram；
Fig. 9 is the slowly varying waveform diagram of voltage；
Figure 10 is the respiratory waveform schematic diagram for breathing lighting；
Figure 11 is the anti-interference waveform diagram of starting；
Figure 12 is temperature alternating curve synoptic diagram；
Figure 13 is voltage alternating curve synoptic diagram.
Specific embodiment
The invention discloses a kind of headlamp LED drive module design and verification methods, need to headlamp LED drive module
The tests exemplar of (abbreviation drive module) executes corresponding test, can test including at least basic electric property, can also include big ginseng
One of number test, the test of PCB maximum load temperature test, high/low temperature Life Cycle and electromagnetic compatibility test are a variety of.When
When comprising above-mentioned all tests, testing scheme is as shown in Figure 1.
Different test item tests exemplars is under different particular job states, and the working condition is according to test
The design value determination of the output voltage, output electric current and output power of exemplar.
Tests exemplar working condition involved in design and verification method of the invention includes following several:
Working condition 1a: exemplar does not power on, and connector and harness are all not connected to；
Working condition 1b: exemplar does not power on, and connector is connected with harness；
Working condition 2a: exemplar works in maximum output voltage, minimum output current state；
Working condition 2b: exemplar works in minimum output voltage, maximum output current state；
Working condition 2c: exemplar works in peak power output, maximum output current state；
Working condition 2d: exemplar works in peak power output, maximum output voltage state；
Working condition 2e: exemplar works in minimum output voltage, minimum output current state.
Different test items by standard difference, in order to simplify subsequent the retouching by standard for each test item
It states, is now described as follows the various functional status being likely to occur using tests exemplar after design and verification method test of the invention:
Class A: tests exemplar or system (refer to tests exemplar and harness connected to it, load including drive module
The component of equal compositions is integrated, similarly hereinafter) institute it is functional run well when interference and after interference, meet design requirement；
Class B: when being disturbed, the functional normal operation of the institute of tests exemplar or system.But one or more function
Can operate can deviate specification error.Institute is functional to restore after interference is withdrawn automatically to normal condition, but memory function should be
Class A；
Class C: one or more functions of tests exemplar or system cannot run well when being disturbed, but interfere
It can restore automatically after withdrawing to normal condition, but memory function cannot be affected；
Class D: when being disturbed and after being disturbed, the function of equipment and system cannot run well, but go
After interfering and resetting starting by operator/user, it can also run well, but memory function cannot be affected；
Class E: when being disturbed and after being disturbed, the function of equipment and system cannot run well, and such as
Fruit does not repair or replaces to equipment or system, then function cannot be restored to normal condition.
1 basic electric property can be tested:
It mainly include constant current function verifying, the verifying of lighting logic checking, resistance stepping, input terminal voltage test, external electricity
It hinders open-circuit-protection verifying, throw load test, the test of voltage kick, 7V start and stop test, 6V start and stop test, reset verifying, signal wire
Slowly decline with load short circuits test, superposition alternating current test, long-time over-voltage test, the verifying of temperature protection curve, voltage slow
It is slow to increase test, anti-reverse verifying and alarming line verifying.
The basic electric property, which can be tested, can further include overvoltage protection verifying, PIN out of circuit test, stablizes output electricity
Press range test, the verifying of high-low pressure Preservation tactics, the verifying of left and right lamp action consistency, light show functional verification, starting anti-interference
Test and voltage transient falling test.
It is the main contents and test method of each item-dividing test during the basic electric property can be tested below.
The verifying of 1.1 constant current functions:
Under room temperature, in tests exemplar work minimum voltage Umin to the voltage range of tests exemplar work maximum voltage Umax
Interior (if without particular/special requirement, general voltage range is 9-16V), it should be ensured that at the corresponding gear of each point of BIN resistance
Constant output current, i.e. output current deviation should be between ± 5%.
1.2 lighting logic checkings:
Circulation is lighted or regular movements needs to meet circulation open circuit logic function, is needed to power off in the circulating cycle and is powered on again, verifies
Whether circulation or the logic of regular movements can have memory after a loss of power, specifically light LED at working condition 2a and 2b, according to
Lighting logic in operation instructions carries out verification experimental verification one by one, needs to comply fully with the logic in specification.
The verifying of 1.3 resistance steppings:
Under room temperature, under UA voltage (supply voltage when alternator operation, usually 14V), according to operation instruction
Whether book verifying divides the corresponding output current value of BIN resistance consistent, and deviation range should be between ± 10%.
The test of 1.4 input terminal voltages:
When drive module has greater than one function, the LED of a function is lighted at working condition 2a and 2b, remaining function
The energization input of energy is pulled down with 1K Ω pull down resistor, then measures the voltage value at pull down resistor both ends, this voltage value should be less than
0.5V.It requires to carry out the test for each function.
1.5 external resistive-open protection verifyings:
LED is lighted at working condition 2a and 2b, then dividing BIN resistance hanging, sees whether tests exemplar can self-shield
(i.e. LED extinguishing), needs tests exemplar that can have defencive function.
The test of 1.6 throw loads:
LED is lighted at working condition 2a and 2b, then exports throw load waveform (as shown in Figure 2) in programmable power supply,
Functional status should be at least Class C.
The parameter of throw load waveform is preferred are as follows: and Umin=13.5V, Umax=27V, Tr≤2ms, T1=300ms, Tf≤
30ms, suspends 1min between circulation, and cycle-index is 10 times.
The test of 1.7 voltage kicks:
LED is lighted at working condition 2a and 2b, then in programmable power supply output voltage kick waveform (see Fig. 3), is needed
Functional status is wanted to be at least Class C.
Voltage kick waveform preferred parameter are as follows: Vmin=13.5V, Vmax=26V, T1=1min, test cycle number are
1.Rise time Tr, fall time Tf are not strictly required, but 10ms are generally not to be exceeded.
1.8 7V start and stop test:
LED is lighted at working condition 2a and 2b, then 7V start and stop waveform is exported in programmable power supply, needs to be cold-started
(Coldstart) functional status is at least up to Class C, and the functional status of thermal starting (Hot Start) is Class A.
Cold start-up waveform is as shown in figure 4, preferred waveform parameter see the table below.
| Parameter | Standard type | It is reinforced |
| VB | 11V | 11V |
| VT | 4.5V | 3.2V |
| VS | 4.5V | 5V |
| VA | 6.5V | 6V |
| VR | 2V | 2V |
| Tf | ≤1ms | ≤1ms |
| T4 | 0ms | 19ms |
| T5 | 0ms | ≤1ms |
| T6 | 19ms | 329 |
| T7 | 50ms | 50ms |
| T8 | 10s | 10s |
| Tr | 100ms | 100ms |
| f | 2Hz | 2Hz |
| Intercycle time T | 2s | 2s |
| Cycle-index | 10 | 10 |
Thermal starting waveform is as shown in figure 5, preferred waveform parameter see the table below.
1.9 6V start and stop test:
LED is lighted at working condition 2a and 2b, then 6V start and stop waveform (referring to Fig. 6) is exported in programmable power supply, needs
Output current wave is monitored with oscillograph to judge the luminous flux of LED whether to zero.Following table is test voltage value.
1) according to the parameter output voltage waveforms in following table
2) waveform shown in Fig. 6 is exported according to the Parameters variation in following table (to quote from the pulse 4 in standard ISO7637-2
Waveform).
The test of the pulse4 in standard IS07637-2 is carried out according to the parameter that following table requires.
| Pulse Severity | Us Note 1 | Ua Note 1 | t9 Note 1 | t11 Note 1 |
| I | 4V | 2.5V | 1s | 40ms |
| II | 5V | 3V, 2.5V | 2s | 60ms |
| III | 6V | 4V, 3V, 2.5V | 5s | 80ms |
| IV | 7V | 5V, 4V, 3V, 2.5V | 10s | 100ms |
In above two output waveform, it is directed to different products, luminous flux needs, which reach respectively different, to be wanted
It asks, as shown in the table.Luminous flux requires to include three kinds of situations, is Condition1, Conditon2, Condition3 respectively.
Condition1: for voltage in 6V or more, luminous flux is greater than 80% in test；
Condition2: when voltage is respectively 10V, 8V, 6V or more in test, luminous flux needs respectively greater than 60%,
25%, 5%:
Condition3: when voltage is respectively 10V, 8V, 6V or more in test, luminous flux needs respectively greater than 40%,
15%, 0%.
Specifically: dipped headlight needs to meet the requirement of Condition1, and high beam, Rear Position Lamp, Brake lamp need to meet
The requirement of Condition2, Rear Fog Lamp, daytime running lamps etc. need to meet the requirement of Condition3.
1.10 reset verifying:
LED is lighted at working condition 2a and 2b, then reset wave (see Fig. 7) is exported in programmable power supply, needs to survey
Waveform, drop-out time are respectively 5s and 100ms, test when needing to return to exemplar work minimum voltage Umin every time twice for examination
The working condition of exemplar is Class A.
The preferred parameter of reset wave are as follows: Vth=6V, △ V1 (Umin to 6V)=0.5V, △ V2 (6 arrive 0V)=0.2V,
T1=5s, T2=100ms, rise/fall time (Tr/Tf)≤100ms, test cycle number=1 time.
1.11 signal wires and load short circuits test:
LED is lighted at working condition 2a and 2b, does not then connect in band load, without load, BAT and does not connect this four shapes with ground wire
The circulation of following short circuit experiment is carried out under state respectively, following (1)-(7) are a circulation.
(1) tests exemplar is placed into incubator and temperature is stablized in exemplar work minimum temperature Tmin；
(2) tests exemplar supply voltage is set as exemplar work maximum voltage Umax；
(3) all I/O lines carry out short circuit, each short circuit duration 15min to BAT；
(4) short circuit is removed, and whether output when validation test exemplar is with normal load is normal；
(5) supply voltage changes exemplar work minimum voltage Umin into, repeats (2)-(4)；
(6) I/O line carries out short circuit to GND, repeats (2)-(5)；
(7) Temperature of Warm Case is stablized in exemplar work maximum temperature Tmax, then repeats (2)-(6).
1.12 superposition alternating current tests:
LED is lighted at working condition 2a and 2b, then exports superposition AC wave shape (such as Fig. 8 institute in programmable power supply
Show), functional status should be Class A.
The parameter for being superimposed AC wave shape is preferred are as follows: Umax=16V, Vpp=6V, cycle T 1=2min, frequency range are
15Hz-30kHz.Internal resistance of source Ri≤100m Ω.
1.13 long-time over-voltages test:
LED is lighted at working condition 2a and 2b, input voltage is then risen into 18V, at Tmax-20 DEG C of environment temperature
1h is tested and is continued, functional status should be Class A.Wherein Tmax is tests exemplar work maximum temperature.
The verifying of 1.14 temperature protection curves:
With the temperature protection curve of thermistor NTC in resistance box verifying specification, that is, confirm obtained NTC resistance and
Export electric current corresponding relation data whether with the Curve Matching on specification.
1.15 voltages, which slowly decline, slowly increases test:
Light LED at working condition 2a and 2b, then from Umax with the rate of 0.5V/min decline input voltage up to
Then 0V rises to Umax from 0V again, in the voltage range greater than Umin, tests exemplar functional status needs for Class A, low
In in the voltage range of Umin, the functional status of tests exemplar at least needs for Class C, the slowly varying waveform of voltage such as figure
Shown in 9.Umax, Umin are respectively the maximum input voltage and minimum input voltage of module work in figure.
1.16 anti-reverse verifyings:
LED is lighted at working condition 2a and 2b, whether also then positive and negative exchange gains for 1 minute again comes, see tests exemplar
Normally, functional status at least should be Class D.
The verifying of 1.17 alarming lines:
Need to carry out the verifying of alarming line logic under room temperature, low temperature and high temperature according to operation instructions, i.e., room temperature, low temperature and
Under high temperature under normal condition alarm line voltage and malfunction alarm line voltage verifying, it is also necessary to carry out room temperature, low temperature and
When turn signal powers on electric alarm wire delay time and LED open circuit alarm wire delay under alarming line delay time, turn signal under high temperature
Between verifying, alarming line delay time should be less than 50ms under all situations.
Above-mentioned two about alarm line voltage, in three verifyings about alarming line delay time, no matter room temperature, low temperature and
High temperature requires to be tested under tri- input voltages of 9V, 14V and 16V respectively for each temperature level.
Pay attention to needing to confirm before verifying and understands alarming line external circuit parameter, resistance value including pull-up resistor and to ground electricity
The capacitance of appearance.
The verifying of 1.18 overvoltage protections:
Tests exemplar band over-voltage protecting function in the case where, light LED at working condition 2a and 2b, make voltage from
16V starts the voltage value toward rising, when record tests exemplar is protected, and judges whether the overvoltage protection voltage with design
Unanimously.
1.19 PIN out of circuit test:
LED is lighted at working condition 2a and 2b, then successively plug signal wire 10s sees whether tests exemplar can be automatic extensive
It is multiple, need functional status to be at least Class D.
1.20 stabilize the output voltage range test:
Use electronic load as fictitious load, whether the output voltage range of verification test exemplar meets driving specification
In the description as described in module output voltage range.
The verifying of 1.21 high-low pressure Preservation tactics:
Examine the starting point, stable point and drop power points and the pass of closing point and voltage decline process of voltage uphill process
Input voltage corresponding to this five positions of close point, output electric current, current output electric current and setting output electric current percentage with
It whether there is difference between high-low pressure protection curve in specification.
1.22 or so lamp action consistency:
For the synchronism of test sample or so lamp movement, increase starting time to tests exemplar, cycle period and
The test of the delay time switched between function.The case where testing needle all has circulatory function to left and right lamp, when needing to postpone
Between in deviation range, at least naked eyes can not tell left and right lamp movement there are successive differences.
1.23 light show functional verifications:
The present invention increases the Verification Project to the light show function of drive module in basic electric property can be tested, and is recycling
It lights, regular movements (or matrix) and when respiratory function, drive module should be able to meet following requirement.
(1) circulation lights function:
It needs with the module that circulation lights function with turn signal safe mode, it is desirable that when CLOCK and SPI is disconnected, turn
The LEDs all to lamp are always on.
The module for lighting function with circulation needs to verify circle logic, when being recycled to 3 LED, LED+ is opened a way, so
It takes back again afterwards, sees whether continue cycling through since the 4th LED, the speed lighted is recycled in test and wants slow, preferably in 30Hz.
(2) matrix (Matrix) function:
Module with Matrix function needs to increase single LED holding function, and LED is from left to right suitable by from right to left again
Sequence is lighted, and then two LED are from toward both sides sequential illumination one by one, eventually passing back to centre in the middle.
Module with Matrix function needs all in the case where CAN is disconnected if be used on turn signal
Turn signal LED can be all always on.
(3) respiratory function:
Tests exemplar with respiratory function needs software to write with a brush dipped in Chinese ink test software to meet breath test mode:
One circulatory and respiratory 3 times --- > position lamp 1min (1 minute, similarly hereinafter) --- > breathing 3 times --- > daytime running lamps
1min --- --- > position lamp 1min --- > breathing 3 times --- > daytime running lamps 1min, persistent loop of > breathing 3 times.
PL (i.e. position lamp) lighting requirement: hanging for often electricity, DRL to PL.
DRL (i.e. daytime running lamps) lighting requirement: hanging for often electricity, PL to DRL.
The respiratory waveform schematic diagram for breathing lighting is as shown in Figure 10.Breathe lighting requirement are as follows: when breathing, DRL is for often electricity, PL
The frequency of the duty cycle signals of input is 100HZ.When exemplar with respiratory function does open circuit experiment, removes power supply line and take back again
Afterwards, LED does not allow to flash, and can postpone to light.
The 1.24 anti-interference tests of starting:
Under the working condition of 2a and 2b, the verifying of waveform shown in Figure 11 is carried out.A-c cycle f=2Hz, voltage rating UN
=12V.Test condition is executed according to the 1-4 in following table.
According to test condition 1, the functional status in tests exemplar test should at least meet Class B, and LED requires to dodge
It is bright.
According to test condition 2,3,4, the functional status in tests exemplar test should at least meet Class C, and LED needs
Restore automatically after test normal.
The test of 1.25 voltage transient fallings:
Under the working condition of 2a and 2b, according in following table parameter and waveform apply test pulse verified, need
The functional status of tests exemplar in testing is at least Class C, can restore automatically normal after test.
1.26 full power low-voltage high-temperature lighting tests:
Allow tests exemplar work in maximum power state, and operating voltage is the minimum of tests exemplar, is held
Continuous work 10 hours, whether check test exemplar was abnormal.
Since the module of DCDC is when minimum is powered, input current is the largest, and then module is in work
It works under maximum temperature.The test tests work performance of the tests exemplar under full power limiting condition, is to see DCDC electricity
Whether road can work normally in the case where under-voltage and one same-action of high temperature, pass through verifying.
2 big parameter testings:
It is to carry out the big parameter testing of room temperature, low temperature and high temperature at working condition 2a and 2b.It is to the effect that normal
Input electricity under each state of temperature in temperature, low temperature and high temperature, when testing respectively and recording 9V, 14V and 16V power voltage supply
Whether exception, start delay time, starting peak point current and failure input electricity for stream, output electric current, output voltage, alarm signal
Stream.
3PCB maximum load temperature test:
It is the maximum temperature of device in the case of output loading maximum power under the different input voltages of measurement.It should make to try when test
It tests exemplar to be under 2c and 2d working condition, each lighting 1h under tri- kinds of supply voltages of 9V, 12V and 18V records the hair of pcb board
Enthusiastic condition, the mainly maximum temperature of registering device need to mark the code name of this component simultaneously when the component for having more than 80 DEG C
The model of this component is recorded, in case the subsequent further relevant parameter for investigating, veritifying the model component.
The test of 4 high/low temperature Life Cycles:
It is the endurance quality for verifying LED drive module under a variety of different operating conditions.These types of difference operating condition is work respectively
State 2a, 2b, 2c and 2d, length of testing speech are generally 2000h, it is desirable that exemplar function is completely normal.Tests exemplar includes harness, bears
Load and tested LED drive module.
The high/low temperature Life Cycle test includes switching cycle test, temperature alternating curve test and voltage alternating curve
Three kinds of test.In order to save the time, multiple exemplars can be chosen and be grouped, every group carries out a kind of test, three kinds of tests simultaneously into
Row.But each tests exemplar will execute whole test items.
The test of 4.1 switching cycles:
For highlighting the LED drive module of low bright LED common functions, according to following period carry out sequence switching:
It is highlighted to open 1 minute that --- > low bright to open 1 minute --- > highlighted to open 20 minutes --- > low bright open 5 minutes --- > is highlighted
Open 8 minutes --- > low bright to open 8 minutes --- > it is highlighted to open 10 minutes --- > low bright to open 5 minutes --- > it is highlighted to open 1 minute --- >
It is low bright to open 1 minute.
For unifunctional LED drive module, according to following period carry out sequence switching:
Open 1 minute --- > close 1 minute --- > open 20 minutes --- > close 5 minutes --- > open 8 minutes --- > close 8 points
Clock --- > open 10 minutes --- > close 5 minutes --- > open 1 minute --- > it closes 1 minute.
4.2 temperature alternating curve tests:
It is tested according to environment temperature alternation curve shown in Figure 12.I.e. in tests exemplar work minimum temperature Tmin shape
Keep 2h under state, with 4h from Tmin be warming up to tests exemplar work maximum temperature Tmax, keep 2h under Tmax state, with 4h from
Tmax cools to Tmin, then 2h is kept under Tmin state, thus completes a temperature alternating circulation.It is followed in this temperature alternating
Continuance test 2000h under ring.
For headlight exterior module, Tmax=120 DEG C, Tmin=-40 DEG C.Module built-in for headlight, Tmax=95 DEG C,
Tmin=-40 DEG C.If the built-in module of headlight does not have closed plastic casing, according to Tmax=120 DEG C, Tmin=-40 DEG C of progress.
4.3 voltage alternating curve tests:
It is tested according to voltage alternating curve synoptic diagram shown in Figure 13.1h is kept under minimum supply voltage, so
Maximum supply power voltage is gradually boosted to from minimum supply voltage with 1h afterwards, and keeps 2h under maximum supply power voltage, then uses 1h
It is gradually depressured to minimum supply voltage from maximum supply power voltage, then keeps 1h under minimum supply voltage, thus completes an electricity
Press alternative cycle.The continuance test 2000h under this voltage alternating circulation.
When test, needs the input current of complete monitoring tests exemplar and LED operation state whether abnormal, need to meet function
It can state Class A.
EMC test mainly include static discharge (Electro-static discharge, abbreviation ESD) test,
Power supply line transient pulse anti-interference (Conducted transient Immunity on power line, abbreviation CI) test,
Bulk current injection (Bulk Current Injection, abbreviation BCI) test, radio frequency it is anti-interference (Radiated Immunity,
Abbreviation RI) test, radiation-emitting (Radiated Emission, abbreviation RE) test and power supply line conducted emission (Conducted
Emission, abbreviation CE) test this six item-dividing tests.
Testing sequence requires to carry out electrostatic discharge testing first, then to carry out power supply line transient pulse anti-interference, finally carries out
Other four kinds tests.
For the module with Matrix function, need to increase in EMC test the corresponding actions function of being directed to single LED
Detection.
The present invention preferably first carries out main circuit ripple test before above-mentioned six item-dividing tests, if the main circuit line of exemplar
Wave is poor, and RE, CE in EMC test test exceeded Probability maximum.If the parameter of measurement, can be with far beyond claimed range
Set about the design rectification of EMC immediately.It is wanted for another angle if the tested exemplar can satisfy above-mentioned ripple test
It asks, just implies that the percent of pass of following EMC test will greatly improve.
The main circuit ripple test is the D foot measurement for the DCDC switch metal-oxide-semiconductor of headlamp LED drive module to be measured
Switching waveform, testing the standard passed through is that switching waveform generates the high current edge rise time less than 70ns, upper punching and undershoot wave
The ripple voltage peak-to-peak value of shape is both less than 500mV, and the ripple voltage peak-to-peak value of output signal over the ground is less than 90mV.
The EMC test can also include the injection test of port small voltage, also carry out before above-mentioned six item-dividing tests.It should
Test is carried out for the drive module of more than one input port, specifically when needing single-point function hanging another
A input port provides the supply voltage of 5V, checks whether headlamp LED drive module to be measured exception occurs.The test can be
The case where tested exemplar is likely to occur in the test of subsequent Bulk current injection is verified to a certain extent.
The main circuit ripple test and port small voltage injection test main testing tool be oscillograph, and this two
Kind tests no sequencing requirement.
Most test items of the invention are based on the technical standard in industry, and the standard of Primary Reference has: CISPR25-
2008、ISO7637-2、ISO10605、ISO11452-4、ISO 11452-2、ISO16750、VW80000-2013、GMW3172-
2015, GMW3097-2015, TL81000-2016 and SMTC3800006-2015, IEC CISPR 25:2008.
Claims (10)
1. a kind of headlamp LED drive module design and verification method, it is characterised in that: executing basic electric property to tests exemplar can survey
Examination, the basic electric property can be tested to be surveyed including constant current function verifying, the verifying of lighting logic checking, resistance stepping, input terminal voltage
Examination, throw load test, the test of voltage kick, 7V start and stop test, 6V start and stop test, is resetted and is tested external resistive-open protection verifying
Card, signal wire and load short circuits test, superposition alternating current test, long-time over-voltage test, the verifying of temperature protection curve, voltage are slow
Slow decline slowly increases test, anti-reverse verifying and alarming line verifying.
2. headlamp LED drive module design and verification method as described in claim 1, it is characterised in that: the lighting logic
Verifying is to make tests exemplar work in maximum output voltage, minimum output current state and work in minimum output electricity respectively
Pressure, maximum output current state carry out verification experimental verification one by one according to the lighting logic in operation instructions.
3. headlamp LED drive module design and verification method as claimed in claim 1 or 2, it is characterised in that: described substantially electric
Performance test further includes overvoltage protection verifying, PIN out of circuit test, stabilize the output voltage range test, high-low pressure Preservation tactics are tested
Card, the verifying of left and right lamp action consistency, light show functional verification, the anti-interference test of starting and voltage transient falling test.
4. headlamp LED drive module design and verification method as claimed in claim 3, it is characterised in that: the light show function
It is able to verify that including the following contents:
(1) circulation lights function:
It needs with the tests exemplar that circulation lights function with turn signal safe mode, it is desirable that when CLOCK and SPI is disconnected, turn
The LEDs all to lamp are always on；The tests exemplar for lighting function with circulation needs to verify circle logic, is being recycled to the 3rd LED
When, LED+ is opened a way, is then taken back again, sees whether continue cycling through since the 4th LED；
(2) matrix functions:
Tests exemplar with matrix functions needs to increase single LED holding function, and LED is from left to right again from right to left by a sequence
It lights, then two LED are from toward both sides sequential illumination one by one, eventually passing back to centre in the middle；Tests exemplar fortune with matrix functions
With on turn signal, needing all turn signal LED in the case where CAN is disconnected that can all be always on；
(3) respiratory function:
Tests exemplar with respiratory function carries out following breath test:
One circulatory and respiratory 3 times --- > position lamp 1min --- > breathing 3 times --- > daytime running lamps 1min --- > breathing 3
Secondary --- > position lamp 1min --- > breathing 3 times --- > daytime running lamps 1min, persistent loop；
The lighting of position lamp requires to be hanging for often electricity, daytime running lamps to position lamp；The lightings of daytime running lamps require be to
Daytime running lamps are hanging for often electricity, position lamp；Breathe lighting requirement are as follows: when breathing, daytime running lamps are for often electricity, position lamp input
The frequencies of duty cycle signals be 100HZ；When exemplar with respiratory function does open circuit experiment, after removal power supply line takes back again, LED
Do not allow to flash.
5. headlamp LED drive module design and verification method as described in claim 3 or 4, it is characterised in that: described substantially electric
Performance test further includes full power low-voltage high-temperature lighting test, the test be allow tests exemplar work in maximum power state, and
And operating voltage is the minimum of tests exemplar, is continued working 10 hours, whether check test exemplar is abnormal.
6. the headlamp LED drive module design and verification method as described in claim 3,4 or 5, it is characterised in that: further include pair
Tests exemplar executes big parameter testing, and the big parameter testing is under each state of temperature in room temperature, low temperature and high temperature,
Whether input current, output electric current, output voltage, alarm signal when testing respectively and recording 9V, 14V and 16V power voltage supply
Exception, start delay time, starting peak point current and failure input current.
7. the headlamp LED drive module design and verification method as described in claim 3,4 or 5, it is characterised in that: further include pair
Tests exemplar executes PCB maximum load temperature test, and the PCB maximum load temperature test is supplied at tri- kinds of 9V, 12V and 18V
Each lighting 1h, records the heat condition of pcb board under piezoelectric voltage, the maximum temperature including registering device, for the member more than 80 DEG C
Device records the code name and model of this component.
8. the headlamp LED drive module design and verification method as described in claim 3,4 or 5, it is characterised in that: further include pair
Tests exemplar executes the test of high/low temperature Life Cycle, and the high/low temperature Life Cycle test includes that switching cycle is tested, temperature is handed over
Varied curve test and three kinds of voltage alternating curve test, length of testing speech 2000h.
9. the headlamp LED drive module design and verification method as described in any one of claim 1-8 claim, special
Sign is: further including executing electromagnetic compatibility test to tests exemplar, the electromagnetic compatibility test includes main circuit ripple test, quiet
Discharge of electricity test, the anti-interference test of power supply line transient pulse, Bulk current injection test, the anti-interference test of radio frequency, radiation-emitting are surveyed
Examination and the test of power supply line conducted emission, wherein the main circuit ripple test is tested as first item, the electrostatic discharge testing
It successively successively carries out, and is completed before remaining four tests, the main circuit line with the anti-interference test of power supply line transient pulse
Wave test is to drive in the case where headlamp LED drive module to be measured is in peak power output for headlamp LED to be measured
The D foot of the DCDC switch metal-oxide-semiconductor of module measures switching waveform, and testing the standard passed through is that switching waveform generates on high current edge
The time is risen less than 70ns, upper rush is both less than 500mV, and the ripple of output signal over the ground with the ripple voltage peak-to-peak value of undershoot waveform
Voltage peak-to-peak value is less than 90mV.
10. headlamp LED drive module design and verification method as claimed in claim 9, it is characterised in that: for more than one
The headlamp LED drive module of input port, the electromagnetic compatibility test further include the injection test of port small voltage, the port
Small voltage injection test is to provide the supply voltage of 5V in hanging another input port when needing single-point function, check to
Survey whether headlamp LED drive module exception occurs, the port small voltage injection test is before the electrostatic discharge testing
It carries out.
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