CN110134100A - A kind of electric machine controller accelerated aging detection method and device - Google Patents
A kind of electric machine controller accelerated aging detection method and device Download PDFInfo
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- CN110134100A CN110134100A CN201810129790.1A CN201810129790A CN110134100A CN 110134100 A CN110134100 A CN 110134100A CN 201810129790 A CN201810129790 A CN 201810129790A CN 110134100 A CN110134100 A CN 110134100A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
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Abstract
The present invention provides a kind of electric machine controller accelerated aging detection method and device, the present invention chooses to the maximum IGBT module of electric machine controller aging effects as test factor, and power cycle accelerated test is constantly carried out within the accelerated test time to IGBT module, to judge the service life of electric machine controller, verify whether electric machine controller tests exemplar fails after accelerated test, further to judge whether electric machine controller meets original design life requirements, also the actual life of available electric machine controller simultaneously, related personnel is facilitated to know the service life of electric machine controller, to be repaired in time to electric machine controller.Electric machine controller acceleration service life test method of the invention can find the problem of influencing electric machine controller reliability in advance, and the reliability for being conducive to improve electric machine controller is compared with routine test, substantially reduce the test period, reduce experimentation cost.
Description
Technical field
The invention belongs to technical field of new energy, in particular to a kind of electric machine controller accelerated aging detection method and
Device.
Background technique
New-energy automobile has the advantages that energy-saving and environmental protection, just becomes the hot spot of young mobile research and development.In recent years, electronic
Automotive engineering has achieved major progress, and during electric vehicle industrialization, reliability is paid close attention to as enterprise and client
Focus.The critical component for influencing new-energy automobile reliability is electric machine controller, and the major function of electric machine controller is that control is driven
Dynamic motor work, provides power for vehicle, and can provide braking function when the vehicle is braked, by Brake energy recovery benefit
With.The working condition of electric machine controller directly affects the traffic safety of vehicle power output and new-energy automobile.The new energy in China
Though automobile starting in source is more early, extensive development is just gradually obtained since 2013, new-energy automobile electric machine controller
The market validation time is not grown also, and reliability is mature not as good as orthodox car components, and reliability demonstration standards system is also unsound.
Therefore, while new-energy automobile fast development, it is necessary to be accelerated by formulating some fairly perfect, reliable electric machine controllers
Life verification method thereof.
Accelerated life test (ALT) is an important branch of reliability test technology, and main theory is not change
Under the premise of product failure mechanism, the Main physical chemical process of enhanced products failure is increased the profit factor, is reached with this and added
The purpose of speed test.Such as Publication No. " CN102589891B ", entitled " a kind of endurance life of vehicle motor driving system is estimated
The Chinese patent of meter method ", the patent consider automobile motor running environment and operating condition, by making a concrete analysis of each pass
The accelerated aging factor and corresponding average life span is calculated in key components different failure mechanism and influence factor, establishes
The service life acceleration curves of each key components and parts, and each key components and parts are obtained under the conditions of normal stress by the curve extrapolation
Fail data, then simultaneously in turn will be by it according to the high performance and durable materials that automobile motor drive system is calculated in above-mentioned data
It shows outside the replacement for the automobile motor system determined or maintenance time to user.The patent is determined jointly by each key components and parts
In the service life of automobile motor drive system, calculating process is comparatively laborious, and can may result in finally because calculation amount is bigger
Obtained electrical machinery life value is not accurate enough, since electric machine controller is the core component of motor driven systems, only calculates electricity in fact
The service life of machine controller, and the service life of electric machine controller is mainly by the aluminium electroloysis in IGBT service life and DC bus Support Capacitor
The restriction in capacitor service life.Since used in new energy vehicles electric machine controller replaces alminium electrolytic condenser conduct using long-service-life metal membrane capacitance
DC bus Support Capacitor, DC bus Support Capacitor are no longer therefore the service life short slab of electric machine controller mainly passes through IGBT
The service life of module evaluates the service life of electric machine controller.It is excessively general that the patent introduces the calculating in IGBT module service life,
The service life that IGBT module is calculated simply by accelerated stress causes the calculating inaccuracy in IGBT module service life, influences motor control
The correct judgement in device service life processed.
Summary of the invention
It is existing for solving the purpose of the present invention is to provide a kind of electric machine controller accelerated aging detection method and device
The problem of electric machine controller service life judgement inaccuracy in technology.
To achieve the above object, the present invention provides a kind of electric machine controller accelerated aging detection methods, including following skill
Art scheme:
A kind of method scheme one, electric machine controller accelerated aging detection method, includes the following steps:
1) it is poor that the junction temperature of IGBT module and junction temperature under accelerated test are set, according to routine test IGBT module power cycle section
The only power cycle cut-off under number and routine test under the junction temperature of IGBT module and knot differential thermal calculation IGBT module accelerated test
Number；
2) electric machine controller exemplar to be measured is chosen, treats the IGBT module of measured motor controller according to the accelerated test of setting
The junction temperature and junction temperature of lower IGBT module are poor, carry out power circulation test until the power reached under the accelerated test of IGBT module follows
Ring ends number, judges whether electric machine controller tests exemplar fails；The power circulation test includes loaded segment and unloaded section,
The loaded segment refers to the electric current that setting is passed to IGBT module, and IGBT module is made to reach highest knot in the first setting time
Temperature, the zero load section instigate IGBT module to drop to initial value by highest junction temperature in the second setting time.
Method scheme two, on the basis of method scheme one, IGBT module power cycle cut-off time under the accelerated test
Several expression formulas are as follows:
Wherein, NcEnd number for routine test IGBT module power cycle；EaFor IGBT module activation energy, Ea=
0.8eV；kBFor Boltzmann constant, kB=8.6 × 10-5eV/K；ΔTcIt is poor for IGBT junction temperature in practice；ΔTaFor accelerated test
IGBT junction temperature is poor；TcFor routine test IGBT junction temperature；TaFor accelerated test junction temperature.
Method scheme three, method scheme four, respectively on the basis of method scheme one or method scheme two, routine test
IGBT module power cycle ends number by routine test IGBT module general power cycle-index divided by electric machine controller sample to be measured
Number of packages obtains.
Method scheme five, method scheme six, respectively on the basis of method scheme three or method scheme four, the conventional examination
Test the acquisition process of IGBT module general power cycle-index are as follows:
According to time projected life of electric machine controller IGBT module, the IGBT module is calculated in the projected life
Interior power cycle number, according to the cycle-index and IGBT module reliability calculating IGBT mould in time projected life
Block crash rate；
Consulting IGBT module confidence level according to IGBT module crash rate is 0.9, and the exponential distribution that failure number is 0 is allowed to fail
Rate test sampling table obtains routine test IGBT module general power cycle-index.
Method scheme seven, method scheme eight, respectively on the basis of method scheme five or method scheme six, the IGBT mould
Block crash rate indicates are as follows:
Wherein, λ is IGBT module crash rate, NRFor the IGBT module power cycle number in time projected life, R is
The reliability of IGBT module.
Method scheme nine, on the basis of method scheme one, when carrying out power circulation test to IGBT module, every third
Setting time is shut down once, makes an inspection tour electric machine controller exemplar to be measured, and check fastener, connector, pipeline, connecting cable, connect
Whether mouth and cooling system break down.
Method scheme ten, on the basis of method scheme nine, each downtime is no more than the 4th setting time.
Method scheme 11, on the basis of method scheme ten, when failure, which need to shut down, analyzes failure, if sentencing
Disconnected failure is caused by the hardware of electric machine controller exemplar to be measured, then is judged as electric machine controller exemplar failure to be measured；If not hard
Part failure continues power circulation test after then debugging.
Method scheme 12, on the basis of method scheme 11, if shutting down to the time of accident analysis is more than the 5th to set
It fixes time, then the 5th setting time for restarting power circulation test was not counted in the power circulation test time.
Method scheme 13, on the basis of method scheme 12, when the power reached under IGBT module accelerated test follows
After ring ends number, insulation resistance, proof voltage, input-output characteristic, temperature rise and the safety of electric machine controller exemplar to be measured are detected
Property whether meet technical conditions requirement, if being unsatisfactory for technical conditions requirement, judge electric machine controller exemplar to be measured failure.
The present invention also provides a kind of electric machine controller accelerated aging detection devices, including following technical scheme:
Device scheme one, a kind of electric machine controller accelerated aging detection device, including testboard bay, power supply and control
Module, the testboard bay accelerate for passing through the current curve of setting to IGBT module as the load of electric machine controller
Power circulation test is carried out, the control module is poor for the junction temperature of IGBT module and junction temperature under accelerated test to be arranged, according to normal
The junction temperature and knot differential thermal calculation IGBT module of IGBT module under rule test IGBT module power cycle cut-off number and routine test
Power cycle under accelerated test ends number；Electric machine controller exemplar to be measured is chosen, the IGBT mould of measured motor controller is treated
Block is poor according to the junction temperature and junction temperature of IGBT module under the accelerated test of setting, carries out power circulation test until reaching IGBT module
Accelerated test under power cycle end number, judge whether electric machine controller tests exemplar fails；The power cycle is surveyed
Examination includes loaded segment and unloaded section, and the loaded segment refers to the electric current for passing to setting to IGBT module, sets IGBT module first
Reach highest junction temperature in fixing time, the zero load section instigates IGBT module to be declined in the second setting time by highest junction temperature
To initial value.
Device scheme two, on the basis of device scheme one, IGBT module power cycle cut-off time under the accelerated test
Several expression formulas are as follows:
Wherein, NcEnd number for routine test IGBT module power cycle；EaFor IGBT module activation energy, Ea=
0.8eV；kBFor Boltzmann constant, kB=8.6 × 10-5eV/K；ΔTcIt is poor for IGBT junction temperature in practice；ΔTaFor accelerated test
IGBT junction temperature is poor；TcFor routine test IGBT junction temperature；TaFor accelerated test junction temperature.
Device scheme three, device scheme four, respectively on the basis of device scheme one or device scheme two, routine test
IGBT module power cycle ends number by routine test IGBT module general power cycle-index divided by electric machine controller sample to be measured
Number of packages obtains.
Device scheme five, device scheme six, respectively on the basis of device scheme three or device scheme four, the conventional examination
Test the acquisition process of IGBT module general power cycle-index are as follows:
According to time projected life of electric machine controller IGBT module, the IGBT module is calculated in the projected life
Interior power cycle number, according to the cycle-index and IGBT module reliability calculating IGBT mould in time projected life
Block crash rate；
Consulting IGBT module confidence level according to IGBT module crash rate is 0.9, and the exponential distribution that failure number is 0 is allowed to fail
Rate test sampling table obtains routine test IGBT module general power cycle-index.
Device scheme seven, device scheme eight, respectively on the basis of device scheme five or device scheme six, the IGBT mould
Block crash rate indicates are as follows:
Wherein, λ is IGBT module crash rate, NRFor the IGBT module power cycle number in time projected life, R is
The reliability of IGBT module.
Device scheme nine, on the basis of device scheme one, when carrying out power circulation test to IGBT module, every third
Setting time is shut down once, makes an inspection tour electric machine controller exemplar to be measured, and check fastener, connector, pipeline, connecting cable, connect
Whether mouth and cooling system break down.
Device scheme ten, on the basis of device scheme nine, each downtime is no more than the 4th setting time.
Device scheme 11, on the basis of device scheme ten, when failure, which need to shut down, analyzes failure, if sentencing
Disconnected failure is caused by the hardware of electric machine controller exemplar to be measured, then is judged as electric machine controller exemplar failure to be measured；If not hard
Part failure continues power circulation test after then debugging.
Device scheme 12, on the basis of device scheme 11, if shutting down to the time of accident analysis is more than the 5th to set
It fixes time, then the 5th setting time for restarting power circulation test was not counted in the power circulation test time.
Device scheme 13, on the basis of device scheme 12, when the power reached under IGBT module accelerated test follows
After ring ends number, insulation resistance, proof voltage, input-output characteristic, temperature rise and the safety of electric machine controller exemplar to be measured are detected
Property whether meet technical conditions requirement, if being unsatisfactory for technical conditions requirement, judge electric machine controller exemplar to be measured failure.
The beneficial effects of the present invention are:
The present invention chooses to the maximum IGBT module of electric machine controller aging effects as test factor, and to IGBT module
Power cycle accelerated test is constantly carried out within the accelerated test time, to judge the service life of electric machine controller, is accelerating to try
Verify whether electric machine controller tests exemplar fails after testing, further to judge whether electric machine controller meets original design
Life requirements, while the also actual life of available electric machine controller, facilitate related personnel to know electric machine controller
Service life, to be repaired in time to electric machine controller.Electric machine controller acceleration service life test method of the invention can mention
Preceding discovery influences the problem of electric machine controller reliability, and the reliability for being conducive to improve electric machine controller is compared with routine test,
The test period is substantially reduced, experimentation cost is reduced.
Detailed description of the invention
Fig. 1 is electric machine controller accelerated aging detection method flow chart of the invention；
Fig. 2 is IGBT module electrical load schematic diagram of the invention.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing:
For the service life of fast verification electric machine controller, the present invention provides a kind of electric machine controller accelerated aging detection sides
Method, as shown in Figure 1, this method comprises the following steps:
1) it is poor that the junction temperature of IGBT module and junction temperature under accelerated test are set, according to routine test IGBT module power cycle section
The only power cycle cut-off under number and routine test under the junction temperature of IGBT module and knot differential thermal calculation IGBT module accelerated test
Number；
2) electric machine controller exemplar to be measured is chosen, treats the IGBT module of measured motor controller according to the accelerated test of setting
The junction temperature and junction temperature of lower IGBT module are poor, carry out power circulation test until the power reached under the accelerated test of IGBT module follows
Ring ends number, judges whether electric machine controller tests exemplar fails；Power circulation test includes loaded segment and unloaded section, load
Section refers to the electric current that setting is passed to IGBT module, and IGBT module is made to reach highest junction temperature within the time of the first setting, unloaded
Section instigates IGBT module to drop to initial value by highest junction temperature within the time of the second setting.
Specifically, it using IGBT power module as the main hinge of new-energy automobile (such as car), plays very crucial
Effect, certainly, IGBT module also other kinds of vehicle, such as the critical component of car, the present embodiment is with car
IGBT module illustrates, it is assumed that the projected life of electric machine controller is 10 years, i.e. the projected life of IGBT module is also 10 years, real
Border is in use, the power cycle of IGBT module and the acceleration and deceleration process of car are corresponding, using Chinese Typical Representative city in the present embodiment
Public transport state of cyclic operation in city's estimates acceleration and deceleration number in car life cycle, and then obtains the power cycle number of IGBT module.It presses
It is 10 years according to integral new-energy passenger Q-percentile life, annual work 365 days, daily working 12 hours, each Typical Cities in China public transport
Circulation continuous 20min, each circulation is interior to be calculated comprising 14 acceleration and deceleration processes, then IGBT module power cycle number is 10*
365*12*60/20*14=1839600 times, compared with Typical Cities in China public transport state of cyclic operation, the high-speed working condition acceleration and deceleration frequency
It is lower, if IGBT module can satisfy Typical Cities in China public transport state of cyclic operation life requirements, it necessarily can satisfy high speed work
Condition life requirements.
To IGBT module life requirements are as follows:
NR: IGBT module power cycle number, NR=1839600 (equivalent 10 years)；
R: reliability, R=0.9；
P: confidence level, P=0.9.
The invalid cost of IGBT module meets exponential distribution, to meet above-mentioned life requirements, the crash rate λ table of IGBT module
It is shown as:
Wherein, λ is the crash rate of IGBT module, NRFor IGBT module power cycle number, R is the reliable of IGBT module
Degree, by NRIn the value substitution formula of R, available λ=5.72 × 10-9/ time.
By consulting IGBT module confidence level P=0.9, allowing failure number is 0 exponential distribution crash rate test sampling table,
It obtains when λ=5.72 × 10-9/ time when, obtain IGBT module routine test general power cycle-index be Nt=3.94 × 108。
IGBT module routine test general power cycle-index NtEnd times N with IGBT module routine test power cyclecRelationship are as follows:
Wherein, k is test sample number of packages, and the present embodiment chooses 6 electric machine controller tests exemplars, i.e. k=6.Then IGBT mould
Block routine test power cycle ends times Nc=7 × 107。
Since routine test does not have feasibility in time, need to design accelerated life test, IGBT under accelerated test
Modular power circulation cut-off times NaAre as follows:
Wherein, NcEnd number, E for IGBT module routine test power cycleaFor IGBT activation energy, Ea=0.8eV；kB
For Boltzmann constant, kB=8.6 × 10-5eV/K；ΔTcPoor, the value 70K for routine test IGBT module junction temperature；ΔTaFor
The accelerated test IGBT junction temperature set is poor, value 110K；TcFor the junction temperature of routine test IGBT module, value 65K；Ta
For the accelerated test junction temperature set, value 125K.
By Ea、kB、ΔTc、Tc、ΔTaAnd TaValue substitute into formula (3), obtain Na=115550.In accelerated test, each function
Rate circulation continuous 1.5min, then accelerated test deadline is t=1.5 × 115550/60=2889h.
To sum up, by accelerated test, 2900h is carried out according to the junction temperature and junction temperature difference of IGBT module under the accelerated test of setting
The IGBT module power circulation test of (2889h is approximately equal to 2900h), i.e. 10 years reliability service service life of equivalent electric machine controller.
IGBT module power cycle accelerated test is the service life in order to test IGBT module, and the service life of IGBT module refers to its energy
Power (electrical load) cycle-index enough born, the service life of IGBT module are mainly influenced by PN junction junction temperature and junction temperature difference.This
Embodiment verifies the service life of IGBT module using junction temperature difference power cycle quick aging method, to IGBT module according to certain frequency
Interval passes to high current, IGBT module self-heating due to own loss, junction temperature rapid increase, after reaching preset junction temperature fluctuation
Stop load, drop to preliminary examination value by certain time IGBT module junction temperature, completes a power cycle, specific implementation to this
Method is as follows:
Using power inductance (or motor bench) as the load of electric machine controller, loading current is as shown in Fig. 2, Ip is load
Electric current reaches the electric current of 135 DEG C of highest junction temperature for IGBT module, when the first setting time t1=30s is load in 30s
Between, the second setting time t2=60s is idle time, and tall=t1+t2 is a complete load cycle period.
After the accelerated test time of IGBT module calculates, the accelerated test time of IGBT module may approximately equal to 2900h,
6 electric machine controller tests exemplars are randomly selected, and numbering is 1#-6#.Testing equipment includes three multi-function test stands, motor platform
Frame, experiment power supply, the electric machine controller load for simulating real vehicle, cooling device, infrared temperature tester, power inductance；Proving ring
Border temperature is 25 DEG C ± 2 DEG C, relative humidity 45%-75%；Electric machine controller water inlet temperature is 25 DEG C ± 2 DEG C.Then will
Electric machine controller is fixed on three multi-function test stands, and all fasteners should be screwed to specified value.Confirm measurement of power machine frame, power supply
Power supply, cooling equipment, the working condition of load are normal.Accelerated test process includes the following steps:
(1) confirm mounted electric machine controller exemplar, can work normally；Install detection system；
(2) electrical load as defined in loading carries out power cycle to IGBT module according to current curve shown in Fig. 2
Test；
(3) allow to shut down once every third setting time, position is arranged 24 hours in third setting time, makes an inspection tour test and setting
It is standby, and check fastener, mechanical fastener and pipeline, especially hose, check connecting cable and interface；Check cooling system,
Downtime is no more than the 4th setting time, and the 4th setting time is set as 0.5h；
(4) it should shut down when breaking down and carry out accident analysis, if failure is caused by electric machine controller hardware, determine exemplar
Failure；If being not belonging to hardware fault, continue to test after debugging.Exemplar failure and failure cause are described in detail and clear
Clear record.If downtime is more than the 5th setting time, the 5th setting time is set as 1h, then the after restarting circulation
1 hour is not counted in test period；
(5) it carries out always carrying out power circulation test to IGBT module, terminates to test until running 2900h, accelerated test
After, exemplar insulation resistance, proof voltage, input-output characteristic, temperature rise and safety are checked according to Q/ZK JS118, if not being inconsistent
Technical conditions requirement is closed, the failure of electric machine controller exemplar is determined, is unsatisfactory for original design life requirements；If all electric machine controllers
After tests exemplar carries out load test by life requirements in 10 years in table 1, equal no-failure then determines that this sample presentation exemplar meets 10 years
Life requirements；If any one exemplar failure in tests exemplar, that is, determining that this sample presentation exemplar is unsatisfactory for life requirements in 10 years (can
By degree 0.9, confidence level 0.9).
Table life test load in 1 10 years requires
| Service life | Electrical load |
| 10 years | 2900h |
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out variation, modification, replacement and deformation still fall in protection scope of the present invention.
Claims (10)
1. a kind of electric machine controller accelerated aging detection method, which comprises the steps of:
1) it is poor that the junction temperature of IGBT module and junction temperature under accelerated test are set, ended according to routine test IGBT module power cycle secondary
The junction temperature of IGBT module and the power cycle tied under differential thermal calculation IGBT module accelerated test end number under several and routine test；
2) electric machine controller exemplar to be measured is chosen, treats the IGBT module of measured motor controller according under the accelerated test of setting
The junction temperature and junction temperature of IGBT module are poor, carry out power circulation test until reaching the power cycle under the accelerated test of IGBT module
End number, judges whether electric machine controller tests exemplar fails；The power circulation test includes loaded segment and unloaded section, institute
It states loaded segment and refers to the electric current for passing to setting to IGBT module, IGBT module is made to reach highest junction temperature in the first setting time,
The zero load section instigates IGBT module to drop to initial value by highest junction temperature in the second setting time.
2. electric machine controller accelerated aging detection method according to claim 1, which is characterized in that under the accelerated test
The expression formula of IGBT module power cycle cut-off number are as follows:
Wherein, NcEnd number for routine test IGBT module power cycle；EaFor IGBT module activation energy, Ea=0.8eV；kBFor
Boltzmann constant, kB=8.6 × 10-5eV/K；ΔTcIt is poor for IGBT junction temperature in practice；ΔTaIt is poor for accelerated test IGBT junction temperature；
TcFor routine test IGBT junction temperature；TaFor accelerated test junction temperature.
3. electric machine controller accelerated aging detection method according to claim 1 or 2, which is characterized in that the conventional examination
IGBT module power cycle cut-off number is tested by routine test IGBT module general power cycle-index divided by electric machine controller to be measured
Exemplar number obtains.
4. electric machine controller accelerated aging detection method according to claim 3, which is characterized in that the routine test
The acquisition process of IGBT module general power cycle-index are as follows:
According to time projected life of electric machine controller IGBT module, the IGBT module is calculated within time projected life
Power cycle number, according in time projected life cycle-index and IGBT module reliability calculating IGBT module lose
Efficiency；
Consulting IGBT module confidence level according to IGBT module crash rate is 0.9, and the exponential distribution crash rate that failure number is 0 is allowed to try
It tests sampling table and obtains routine test IGBT module general power cycle-index.
5. electric machine controller accelerated aging detection method according to claim 4, which is characterized in that the IGBT module is lost
Efficiency indicates are as follows:
Wherein, λ is IGBT module crash rate, NRFor the IGBT module power cycle number in time projected life, R is IGBT mould
The reliability of block.
6. electric machine controller accelerated aging detection method according to claim 1, which is characterized in that carried out to IGBT module
When power circulation test, shut down every third setting time primary, make an inspection tour electric machine controller exemplar to be measured, and check fastener,
Whether connector, pipeline, connecting cable, interface and cooling system break down.
7. electric machine controller accelerated aging detection method according to claim 6, which is characterized in that each downtime is not
More than the 4th setting time.
8. electric machine controller accelerated aging detection method according to claim 7, which is characterized in that need to stop when failure
Machine analyzes failure, if judging, failure is caused by the hardware of electric machine controller exemplar to be measured, is judged as to measured motor control
Device exemplar failure processed；If not hardware fault, then continue power circulation test after debugging.
9. electric machine controller accelerated aging detection method according to claim 8, which is characterized in that if shutting down to failure point
The time of analysis is more than the 5th setting time, then the 5th setting time for restarting power circulation test is not counted in power cycle survey
It tries in the time.
10. a kind of electric machine controller accelerated aging detection device, which is characterized in that including testboard bay, power supply and control
Module, the testboard bay accelerate for passing through the current curve of setting to IGBT module as the load of electric machine controller
Power circulation test is carried out, the control module is poor for the junction temperature of IGBT module and junction temperature under accelerated test to be arranged, according to normal
The junction temperature and knot differential thermal calculation IGBT module of IGBT module under rule test IGBT module power cycle cut-off number and routine test
Power cycle under accelerated test ends number；Electric machine controller exemplar to be measured is chosen, the IGBT mould of measured motor controller is treated
Block is poor according to the junction temperature and junction temperature of IGBT module under the accelerated test of setting, carries out power circulation test until reaching IGBT module
Accelerated test under power cycle end number, judge whether electric machine controller tests exemplar fails；The power cycle is surveyed
Examination includes loaded segment and unloaded section, and the loaded segment refers to the electric current for passing to setting to IGBT module, sets IGBT module first
Reach highest junction temperature in fixing time, the zero load section instigates IGBT module to be declined in the second setting time by highest junction temperature
To initial value.
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