CN106291305A - A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic - Google Patents
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic Download PDFInfo
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Abstract
The present invention relates to a kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic, the method comprises the steps: to run current transformer, obtains the turn-on characteristics curve of each IGBT pipe, turn-off characteristic curve and IGBT module watchcase temperature in the IGBT module that pending fault diagnoses in advance；Obtain turn-on characteristics curve and the turn-off characteristic curve diagnosing each IGBT pipe in the healthy IGBT module that IGBT module model is identical at a temperature of identical watchcase with pending fault in advance；Turn-on characteristics curve and the turn-off characteristic curve of IGBT pipe corresponding in the IGBT module diagnosed in advance by pending fault and healthy IGBT module contrast two-by-two, the characteristic curve obtaining each IGBT pipe is the most abnormal, if at least one IGBT pipe characteristic curve occurs abnormal, then the IGBT module that this pending fault diagnoses in advance breaks down.Compared with prior art, the inventive method is easy, diagnostic accuracy is high, the suitability is strong.
Description
Technical field
The present invention relates to a kind of current transformer IGBT module fault pre-diagnosing method, especially relate to a kind of based on switching characteristic
Current transformer IGBT module fault pre-diagnosing method.
Background technology
Current transformer is a kind of electrical energy changer, is widely used in generation of electricity by new energy, electric automobile, track traffic, aviation
The field such as space flight and metallurgy.IGBT module is the core devices of current transformer, and therefore the fault of IGBT module will directly affect change
Stream device operational reliability.As a example by common encapsulation class fault, due to the difference of inner. layers material thermal expansion coefficient, IGBT mould
Block there will be in During Process of Long-term Operation solder layer aging with wire breaking etc. fault.
Fault pre-diagnosing technology can carry out timely early warning to fault before IGBT module loses efficacy, the sexual behavior that can be against any misfortune event
Generation can be again system high efficiency operation and maintenance provide support, therefore this technology be increasingly becoming raising converter system run
The key technology of reliability.Existing current transformer IGBT module fault pre-diagnosing technology can be roughly divided into modelling, device parameters
Method and three kinds of different methods of system variable method.
Modelling utilizes the health status of mathematical model online evaluation IGBT module, but its accuracy is limited by model accuracy
System.Such as document: Exploration of power device reliability using compact device models
And fast electro-thermal simulation and document: Real-time life consumption power
Modules prognosis using on-line rainflow algorithm in metro applications, above-mentioned
Document all utilizes the compact electrothermic model of IGBT and current transformer fast electric heating emulation technology, constantly becomes at converter system operating condition
Under conditions of change, IGBT module is carried out " online " biometry.But biometry result the most accurately depends in the method
Model accuracy (device reliability model, electrothermic model).Multiple in view of the dispersibility of device parameters in real system, fault mode
Miscellaneous various and device state affects the factors such as junction temperature estimation, and it is the most pre-that this technology is difficulty with the current transformer IGBT module life-span
Survey.
Device parameters method is by monitoring IGBT dynamic and static state parameters acquisition module status information, but owing to device parameters is difficult to directly
Connect measurement, the method field conduct difficulty.Document: In Situ Diagnostics and Prognostics of Wire
Bonding Faults in IGBT Modules for Electric Vehicle Drives is by measuring IGBT conducting pressure
Fall VCE(sat)Judge bonding line breaking degree with the relation of junction temperature, conducting electric current, improve the reliability of power model.Document: base
In the power electronic equipment Condition Monitoring Technology of leakage current, by the method for periodic monitoring IGCT leakage current to rolling mill
Current transformer fault carries out pre-diagnosis, improves fault diagnosis efficiency.Document: Ageing defect detection on IGBT
Power modules by artificial training methods based on pattern recognition utilizes
IGBT on state voltage and junction temperature Monitoring Data use artificial neural network to set up device model, and identify event by Success in Experiment
Barrier and healthy device.Document: Effects of wire-bond lift-off on gate circuit of IGBT power
Modules, by contrast IGBT module wire breaking front/rear door pole tension signal, proposes to utilize gate voltage Miller platform to degenerate
The method of degree difference diagnosis IGBT key wiring faults.Chinese patent 201210528663.1 is by monitoring IGBT collection radio pressure
VCE, collector current IC, gate leve voltage VGEAnd the enforcement of inside modules key wiring faults is diagnosed by baseplate temp signal.Conclude
Getting up, above-mentioned document and patent are all to utilize device parameters that IGBT module fault is carried out pre-diagnosis, but in real system
IGBT is all packaged into discrete component or module is arranged on inside current transformer, device parameters in-site measurement difficulty.
System variable method is by monitoring the change (such as output voltage, electric current and radiator temperature) of converter system variable
Diagnosing IGBT module failure condition, but IGBT module fault causes system variable change faint, accurate measurements is more tired
Difficult.Document: Online ringing characterization as a diagnostic technique for IGBTs
In power drives devises high-frequency band pass filter circuit (5MHz), the higher-order of oscillation produced during by detection IGBT switch
The feature of electric current judges that this IGBT is the most aging at (including amplitude and damped coefficient).Chinese patent 201310099893.5 passes through
Line monitors the voltage of IGBT module output or the low-order harmonic signal of electric current and watchcase temperature signal, to IGBT module health status
It is estimated.Document: Condition Monitoring Power Module Solder Fatigue Using Inverter
Harmonic Identification experiments prove that, 5 subharmonic in converter output current phase can be used to solder layer
Degradation failure carries out pre-diagnosis.Being summed up, above-mentioned document and patent be on-line monitoring and IGBT mould in current transformer running
The converter system variable (such as the higher-order of oscillation, output harmonic wave and watchcase temperature etc.) that block malfunction is relevant, but this technology needs
Increase extra hardware unit and fault diagnosis result is easily disturbed by outer signals.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of based on switching characteristic
Current transformer IGBT module fault pre-diagnosing method.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic, for the IGBT mould in current transformer
Block carries out fault pre-diagnosing, and the method comprises the steps:
(1) run current transformer, obtain the turn-on characteristics curve of each IGBT pipe, pass in the IGBT module that pending fault diagnoses in advance
Disconnected characteristic curve and IGBT module watchcase temperature；
(2) diagnose in the healthy IGBT module that IGBT module model is identical each at a temperature of obtaining identical watchcase in advance with pending fault
The turn-on characteristics curve of individual IGBT pipe and turn-off characteristic curve；
(3) each IGBT pipe turn-on characteristics curve and the turn-off characteristic curve of step (1) and (2) are contrasted two-by-two, obtain
The characteristic curve of each IGBT pipe is the most abnormal, if at least one IGBT pipe characteristic curve occurs abnormal, then this pending fault diagnoses in advance
IGBT module break down.
In step (3), the characteristic curve of each IGBT pipe is the most abnormal obtains especially by following manner:
IGBT pipe corresponding in the contrast IGBT module that diagnoses in advance of pending fault and healthy IGBT module the most two-by-two open-minded
Characteristic curve and turn-off characteristic curve, if the turn-on characteristics curve of the IGBT pipe in the IGBT module that diagnoses in advance of pending fault or shutoff
The turn-on characteristics curve of IGBT pipe corresponding at least one more healthy IGBT module of characteristic curve in characteristic curve or shutoff spy
Linearity curve deforms upon or offsets, and deformation quantity or side-play amount exceed set point, then judge that IGBT pipe characteristic curve exists different
Often.
The turn-on characteristics curve of the IGBT pipe in step (1) and step (2) and turn-off characteristic curve are especially by such as lower section
Formula obtains:
A () runs current transformer, obtain current transformer output line voltage and line current；
B () obtains the service time in multiple switch periods of IGBT pipe in current transformer and turn-off time according to line voltage；
C () obtains, according to line current, IGBT pipe the opening the moment and turning off the line electricity in moment in correspondence that pending fault diagnoses in advance
Stream；
D (), to open time line electric current as transverse axis, corresponding service time is that the longitudinal axis is drawn curve to obtain turn-on characteristics bent
Line, simultaneously with shutoff time line electric current as transverse axis, the corresponding turn-off time is that longitudinal axis drafting curve obtains turn-off characteristic curve.
Step (b) particularly as follows:
(b1) according to converter structure and modulation algorithm extract with IGBT pipe turn on and off the current transformer being associated
Output line voltage；
(b2) rising edge of captured line voltage or trailing edge in the line voltage from step (b1)；
(b3) it is analyzed according to the line voltage of converter structure, modulation algorithm and correspondence, determines step (b2) line electricity
Incidence relation between the turning on and off of the rising edge of pressure or trailing edge and IGBT pipe；
(b4) open rising edge or the trailing edge of the line voltage of correspondence according to IGBT pipe, obtain voltage in this line voltage edge
Value duration in set point is the service time of IGBT pipe, in like manner, obtains the turn-off time of IGBT.
Step (c) particularly as follows: first according to converter structure and modulation algorithm extract with corresponding IGBT pipe open-minded
The current transformer output lead electric current being associated with shutoff, the opening process start time and the turn off process that then extract IGBT pipe start
The current value that moment is corresponding, thus correspondence obtains opening moment electric current and turning off moment electric current.
Described watchcase temperature is obtained by the temperature sensor being internally integrated in IGBT module.
Compared with prior art, present invention have the advantage that
(1) the inventive method makes full use of the output line voltage can being convenient for measuring outside converter system and obtains with line current
Taking the operation characteristic of the service time of IGBT, turn-off time and electric current, thus implement fault pre-diagnosing, the method need not becoming
Stream device is internal implants testing circuit, simplifies test system structure, and field conduct is convenient；
(2) the inventive method is using IGBT service time and turn-off time as characteristic variable, and its intensity of variation directly can
The health status of reflection IGBT module, IGBT is a kind of power electronic devices being operated under HF switch state, it dynamic
Switching characteristic can in time, effectively reflect the health status that device runs, and eliminates what modeling and simulating and Theoretical Calculation were brought
Error, IGBT switching characteristic can directly reflect module health status simultaneously, and few by extraneous factor interference, in addition, IGBT opens
Pass frequency is high, can conveniently obtain mass data during on-the-spot test, contributes to eliminating further measurement error, improves fault pre-diagnosing
Accuracy；
(3) regardless of the topological structure of current transformer in the present invention, its output line voltage is all by each IGBT internal
Device alternation switch produces, and the present invention measures current transformer output line voltage pwm pulse rising edge or trailing edge, can obtain arbitrarily knot
The switching characteristic of each IGBT device in structure current transformer, the suitability is good.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of fault pre-diagnosing method of the present invention；
Fig. 2 is the turn-on characteristics distribution schematic diagram of IGBT pipe in IGBT module of the present invention；
Fig. 3 is the turn-off characteristic distribution schematic diagram of IGBT pipe in IGBT module of the present invention；
Fig. 4 is IGBT pipe and the turn-off characteristic contrast of IGBT pipe in aging IGBT module in embodiment health IGBT module
Figure.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic, first records when current transformer dispatches from the factory
Under health status IGBT module switching characteristic and in this, as the benchmark of fault pre-diagnosing.It follows that ran at current transformer
Journey is periodically or non-periodically tested, healthy with the change acquisition module of current IGBT switching characteristic by contrast health status
State and failure condition.
The concrete steps of current transformer IGBT module switching characteristic on-the-spot test method are as shown in Figure 1:
S1: test prepares: install voltage and current probe, measure current transformer output line voltage and line current.Voltage probe
Requirement has high bandwidth, with capture in current transformer output line voltage high speed change rise or fall edge.In utilizing current transformer
The temperature sensor measurement IGBT watchcase temperature that portion is integrated.For preventing IGBT module excess temperature, under normal circumstances inside current transformer all
There is ready-made temperature sensor monitors IGBT temperature.
S2: device number: in the IGBT module diagnosed pending fault in current transformer in advance, each IGBT pipe is numbered and root
According to converter topologies and the concrete modulation algorithm of PWM by their switching process and current transformer output line voltage rising edge/under
Fall is along associating.
S3: DATA REASONING and record: run current transformer under that loading condition (such as nominal load), measure and record current transformer
Output line voltage and line current.
S4: devices switch specificity analysis: analyze each IGBT pipe according to measurement data and open between turn-off time and electric current
Operation characteristic functional relationship fon(i)、foffI (), draws the turn-on characteristics curve of IGBT pipe, turn-off characteristic curve: during to open
Groove electric current is transverse axis, and corresponding service time is that longitudinal axis drafting curve obtains turn-on characteristics curve, simultaneously to turn off time line
Electric current is transverse axis, and the corresponding turn-off time is that longitudinal axis drafting curve obtains turn-off characteristic curve.
Obtain at a temperature of identical watchcase diagnose in advance with pending fault in the healthy IGBT module that IGBT module model is identical each
The turn-on characteristics curve of individual IGBT pipe and turn-off characteristic curve, i.e. current transformer record opening of IGBT module under health status when dispatching from the factory
Logical characteristic curve and turn-off characteristic curve, the IGBT module that contrast pending fault diagnoses in advance the most two-by-two is right with in healthy IGBT module
The turn-on characteristics curve of the IGBT pipe answered and turn-off characteristic curve, if the opening of the IGBT pipe in the IGBT module that diagnoses in advance of pending fault
Lead to the open-minded of IGBT pipe corresponding at least one more healthy IGBT module of characteristic curve in characteristic curve or turn-off characteristic curve
Characteristic curve or turn-off characteristic curve deform upon or offset, and deformation quantity or side-play amount exceed set point, then judge IGBT
Pipe characteristic curve exists abnormal.The IGBT module of diagnosis pre-for pending fault, if at least one IGBT pipe characteristic curve occurs different
Often, then the IGBT module that this pending fault diagnoses in advance breaks down.
In IGBT module, the turn-on characteristics distribution schematic diagram of IGBT pipe is as in figure 2 it is shown, figure cathetus is healthy IGBT module
The turn-on characteristics curve of middle IGBT pipe, if each point in the turn-on characteristics curve of IGBT pipe in the IGBT module that diagnoses in advance of pending fault
In the range of near straight line, variance is-5%～5% the most in the drawings, then in the IGBT module that pending fault diagnoses in advance, IGBT pipe turns off spy
Linearity curve is normal, otherwise abnormal for existing.Fig. 3 is the turn-off characteristic distribution schematic diagram of IGBT pipe in IGBT module, straight in figure
Line is the turn-off characteristic curve of IGBT pipe in IGBT module, in like manner, if the pass of IGBT pipe in the IGBT module that diagnoses in advance of pending fault
In the range of near each point straight line the most in the drawings in disconnected characteristic curve, variance is-5%～5%, then the IGBT that pending fault diagnoses in advance
In module, IGBT pipe turn-off characteristic curve is normal, otherwise abnormal for existing.And differentiate the characteristic curve of whole IGBT pipe abnormal with
No is according to opening hot curve and turn-off characteristic curve carrys out comprehensive descision, if in turn-on characteristics curve or turn-off characteristic curve
At least one characteristic curve is abnormal then judges that the IGBT pipe of correspondence is abnormal.
IGBT service time t defined in the inventive methodv.onFor collection emitter voltage VCEFrom VHIGHDrop to VLOWProcess
Time；Turn-off time tv.offFor VCEFrom VLOWRise to VHIGHThe time of process.Wherein VLOWWith VHIGHCan be according to real system
Specifically determine, such as VLOWFor 10%VDC, VHIGHFor 90%VDC.The IGBT turn-on characteristics f of the inventive method definitionon(i) be
IGBT module watchcase temperature TcUnder conditions of Yi Ding, service time tv.onAnd the functional relationship between line current i；Turn-off characteristic foff
I () is in IGBT module watchcase temperature TcUnder conditions of Yi Ding, turn-off time tv.offAnd the functional relationship between line current i.IGBT
Module failure can affect opening and turn-off characteristic of IGBT, thus cause in current transformer output line voltage pwm pulse rising edge or
The change of trailing edge.
Turn-on characteristics curve and the turn-off characteristic curve of IGBT pipe obtain especially by following manner:
A () runs current transformer, obtain current transformer output line voltage and line current；
B () obtains the service time in multiple switch periods of IGBT pipe in current transformer and turn-off time according to line voltage；
C () obtains, according to line current, IGBT pipe the opening the moment and turning off the line electricity in moment in correspondence that pending fault diagnoses in advance
Stream；
D (), to open time line electric current as transverse axis, corresponding service time is that the longitudinal axis is drawn curve to obtain turn-on characteristics bent
Line, simultaneously with shutoff time line electric current as transverse axis, the corresponding turn-off time is that longitudinal axis drafting curve obtains turn-off characteristic curve.
Step (b) particularly as follows:
(b1) according to converter structure and modulation algorithm extract with IGBT pipe turn on and off the current transformer being associated
Output line voltage；
(b2) rising edge of captured line voltage or trailing edge in the line voltage from step (b1)；
(b3) it is analyzed according to the line voltage of converter structure, modulation algorithm and correspondence, determines step (b2) line electricity
Incidence relation between the turning on and off of the rising edge of pressure or trailing edge and IGBT pipe；
(b4) open rising edge or the trailing edge of the line voltage of correspondence according to IGBT pipe, obtain voltage in this line voltage edge
Value duration in set point is the service time of IGBT pipe, in like manner, obtains the turn-off time of IGBT.Specifically
Ground, service time: find the line voltage edge corresponding with IGBT pipe opening process, service time is magnitude of voltage on this section of edge
Corresponding VLOWWith VHIGHBetween time.Turn-off time: find the line voltage edge corresponding with IGBT pipe turn off process, turn-off time
It is V on this section of edgeLOWWith VHIGHBetween time, VLOWWith VHIGHValue can be with sets itself.Really line voltage rising edge or
The IGBT pipe of the IGBT module that trailing edge and pending fault diagnose in advance turn on and off between incidence relation can by test or
Person's emulation mode is analyzed obtaining.
Step (c) particularly as follows: first according to converter structure and modulation algorithm extract with corresponding IGBT pipe open-minded
The current transformer output lead electric current being associated with shutoff, the opening process start time and the turn off process that then extract IGBT pipe start
The current value that moment is corresponding, thus correspondence obtains opening moment electric current and turning off moment electric current.
During whole fault pre-diagnosing, the watchcase temperature of IGBT can be by the temperature being internally integrated in IGBT module
Sensor obtains.
Current transformer IGBT module During Process of Long-term Operation is susceptible to solder layer under temperature cycles and power cycle effect
Degradation failure.The rupturing of the aging generation of solder layer, cavity can make heat flux density increase, and hinders igbt chip heat to scatter and disappear,
IGBT may be caused eventually to burn inefficacy.In order to verify the correctness of the fault pre-diagnosing method of the present invention.Test owing to belonging to experiment
Card, it is known that the turn-off characteristic of IGBT pipe is affected relatively big by solder layer degradation failure, therefore only to occurring solder layer aging before and after
IGBT module (FF50R12RT4) turn-off time characteristic f in 380V/10kW three phase full bridge two-level inverterv.off(i) carry out
Test, to implementation process as follows:
1. at converter system outfan, voltage probe and current probe are installed.Voltage probe model is DP6130 High Pressure Difference
Sub-probe, carries a width of 100MHz, to capture current transformer AB phase output line voltage VabIn high speed change rise or fall edge, electricity
Stream probe model is CP8030A, and record turns off moment A phase output lead electric current Ia.And the temperature using current transformer to be internally integrated passes
Sensor measures IGBT watchcase temperature Tc。
2. each brachium pontis of current transformer uses healthy trouble-free IGBT power model, by the numbered T1 of pipe IGBT on A phase brachium pontis,
The numbered T2 of down tube IGBT.And the switching process of T1 is associated with current transformer output line voltage rising edge or trailing edge, should
In embodiment, current transformer is three phase full bridge two-level inverter, and modulation system uses Sine Wave Pulse Width Modulation (SPWM), through undue
Analysis obtains T1 pipe switching process and AB phase output line voltage V in IGBT moduleabConcrete correspondence between middle rising edge and trailing edge
Relation is: comprise two rising edges and two trailing edges, output line voltage V in each switch periodsabFirst rising
Along being associated with opening of T1 pipe, output line voltage VabSecond trailing edge be associated with the shutoff of T1 pipe.Due to actual system
Unite not quite identical at aspects such as modulation system, acceptable operating point, topological structure, it is therefore desirable to specifically determine according to practical situation
Incidence relation between switching process and line voltage rising edge or the trailing edge of IGBT.
3. under normal loading conditions, run current transformer, measure and record current transformer AB phase output line voltage VabWith A phase line
Electric current Ia, and record current transformer skin temperature Tc。
4. by corresponding with current data root to the current transformer output line voltage rising edge corresponding with T1 IGBT pass or trailing edge
Relation is separated, according to the turn-off time t of the inventive methodv.offDefinition, makes VLOW=60V, VHIGH=540V, measures No. T1
The turn-off time of IGBT pipe and the line current turning off the moment.The all turn-off times recorded finally according to T1 IGBT and line current
It is worth to the turn-off characteristic f of this IGBTv.off(i)_1。
5. converter system is out of service, and A phase brachium pontis power model replaces with the IGBT power occurring solder layer aging
Module, repetition step 1, to step 4, obtains the turn-off characteristic f of IGBT pipe in fault IGBT moduleoff(i)_2。
6. by the turn-off characteristic f of healthy IGBToff(i) _ 1 and the turn-off characteristic f of aging IGBToffI () _ 2 are plotted in Fig. 4
In.In identical watchcase temperature TcUnder the conditions of=25 DEG C, when flowing through same current, the pass of IGBT pipe in the aging IGBT module of solder layer
Break time than the IGBT pipe turn-off time long few tens of nano-seconds of healthy IGBT module, aging before and after the turn-off characteristic of IGBT there occurs
Offset, and degrees of offset exceedes normal allowed band (being caused by measurement error).Therefore, by contrast fault aging before and after
The change of IGBT turn-off time turn-off characteristic can go out module solder layer degradation failure by efficient diagnosis.
Claims (6)
1. a current transformer IGBT module fault pre-diagnosing method based on switching characteristic, for the IGBT module in current transformer
Carry out fault pre-diagnosing, it is characterised in that the method comprises the steps:
(1) run current transformer, obtain the turn-on characteristics curve of each IGBT pipe in the IGBT module that pending fault diagnoses in advance, turn off spy
Linearity curve and IGBT module watchcase temperature；
(2) obtain and diagnose in the healthy IGBT module that IGBT module model is identical each at a temperature of identical watchcase with pending fault in advance
The turn-on characteristics curve of IGBT pipe and turn-off characteristic curve；
(3) each IGBT pipe turn-on characteristics curve and the turn-off characteristic curve of step (1) and (2) are contrasted two-by-two, obtain each
The characteristic curve of IGBT pipe is the most abnormal, if at least one IGBT pipe characteristic curve occurs abnormal, then this pending fault diagnoses in advance
IGBT module breaks down.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic the most according to claim 1, it is special
Levying and be, in step (3), the characteristic curve of each IGBT pipe is the most abnormal obtains especially by following manner:
The turn-on characteristics of the IGBT pipe that the IGBT module that contrast pending fault diagnoses in advance the most two-by-two is corresponding with in healthy IGBT module
Curve and turn-off characteristic curve, if the turn-on characteristics curve of the IGBT pipe in the IGBT module that diagnoses in advance of pending fault or turn-off characteristic
The turn-on characteristics curve of IGBT pipe corresponding at least one more healthy IGBT module of characteristic curve in curve or turn-off characteristic are bent
Line deforms upon or offsets, and deformation quantity or side-play amount exceed set point, then judge that IGBT pipe characteristic curve exists abnormal.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic the most according to claim 1, it is special
Levying and be, the turn-on characteristics curve of the IGBT pipe in step (1) and step (2) and turn-off characteristic curve are especially by following manner
Obtain:
A () runs current transformer, obtain current transformer output line voltage and line current；
B () obtains the service time in multiple switch periods of IGBT pipe in current transformer and turn-off time according to line voltage；
C () obtains, according to line current, IGBT pipe the opening the moment and turning off the line current in moment in correspondence that pending fault diagnoses in advance；
D (), to open time line electric current as transverse axis, corresponding service time is that the longitudinal axis is drawn curve and obtained turn-on characteristics curve, with
Time to turn off time line electric current as transverse axis, the corresponding turn-off time is that the longitudinal axis is drawn curve and obtained turn-off characteristic curve.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic the most according to claim 3, it is special
Levy and be, step (b) particularly as follows:
(b1) current transformer being associated that turns on and off extracted with IGBT pipe according to converter structure and modulation algorithm exports
Line voltage；
(b2) rising edge of captured line voltage or trailing edge in the line voltage from step (b1)；
(b3) it is analyzed according to the line voltage of converter structure, modulation algorithm and correspondence, determines step (b2) line voltage
Incidence relation between the turning on and off of rising edge or trailing edge and IGBT pipe；
(b4) open rising edge or the trailing edge of the line voltage of correspondence according to IGBT pipe, obtain magnitude of voltage in this line voltage edge and exist
In set point, duration is the service time of IGBT pipe, in like manner, obtains the turn-off time of IGBT.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic the most according to claim 3, it is special
Levy and be, step (c) particularly as follows: first according to converter structure and modulation algorithm extract with corresponding IGBT pipe open and
Turn off the current transformer output lead electric current that is associated, then extract opening process start time of IGBT pipe and time turn off process starts
Carve corresponding current value, thus correspondence obtains opening moment electric current and turning off moment electric current.
A kind of current transformer IGBT module fault pre-diagnosing method based on switching characteristic the most according to claim 1, it is special
Levying and be, described watchcase temperature is obtained by the temperature sensor being internally integrated in IGBT module.
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| CN108051737A (en) * | 2017-12-04 | 2018-05-18 | 华北电力大学 | A kind of switching device screening system and method |
| CN108508342A (en) * | 2018-05-28 | 2018-09-07 | 中国科学院上海微系统与信息技术研究所 | A kind of IGBT short circuit overcurrents detection circuit |
| CN112433115A (en) * | 2020-11-12 | 2021-03-02 | 中南大学 | Aging injector, power device and traction converter aging modeling method |
| CN112946449A (en) * | 2021-01-28 | 2021-06-11 | 臻驱科技（上海）有限公司 | Power semiconductor device model selection method |
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| CN112433115A (en) * | 2020-11-12 | 2021-03-02 | 中南大学 | Aging injector, power device and traction converter aging modeling method |
| CN112433115B (en) * | 2020-11-12 | 2022-07-08 | 中南大学 | Aging injector, power device and traction converter aging modeling method |
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