CN105005639B - The MATLAB models and construction method of IGCT actual characteristic can be emulated - Google Patents
The MATLAB models and construction method of IGCT actual characteristic can be emulated Download PDFInfo
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- CN105005639B CN105005639B CN201510339858.5A CN201510339858A CN105005639B CN 105005639 B CN105005639 B CN 105005639B CN 201510339858 A CN201510339858 A CN 201510339858A CN 105005639 B CN105005639 B CN 105005639B
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Abstract
The present invention is a kind of MATLAB model and construction method for emulating IGCT actual characteristic；Structure includes original Thyristor Model, signal control module, enabled systems module and afterflow module in MATLAB；On the basis of the thyristor module carried in MATLAB, its current value is acquired by signal control module and logical operation, input signal and enabled control signal as enabled systems module, pass through the comparison operation of enabled systems module again, its output signal controls afterflow module, produces the freewheel current of IGCT.On this basis, the voltage in model, electric current are measured, definition is re-started to its four ports a, k, g and m, forms newly-built Thyristor Model.Advantage：The Reverse recovery curve of electric current in IGCT can be reflected, make up the sharp cut-off idealization defect of current curve in the Thyristor Model carried in MATLAB, embody the actual characteristic of Thyristor Model, there is stronger application value.
Description
Technical field
The present invention relates to a kind of MATLAB models and construction method for emulating IGCT actual characteristic.
Background technology
The VA characteristic curve of IGCT with actual characteristic, as representated by the first quartile in Fig. 1-1 be its just
To characteristic, representated by third quadrant is its reverse characteristic.WhenWhen, if imposing forward voltage at IGCT both ends, its
It is not turned on.If forward voltage continues to increase, until its value exceedes break over voltageWhen, it can turn it on.From Fig. 1-1, with
Gradually increase,Gradually reduce.If impose backward voltage at IGCT both ends, it is turned off, if backward voltage continues
Increase, when reaching breakdown reverse voltage, its reverse current increases rapidly, if limiting not in time, can make its heating or even puncture.
Therefore, the trigger voltage of forward and reverse voltage and the gate circuit offer needed for IGCT, electric current should be all controlled in rational model
In enclosing.The electric current for flowing through IGCT is changed over time shown in curve map 1-2, and IGCT flows through positive electricity under forward voltage effect
Stream, electric current drops to reverse maximum under backward voltage effect, then it is decreased to zero with certain rule.Due in MATLAB
Original Thyristor Model only has forward characteristic, and when applying backward voltage at its both ends, it is 0 that its current value, which directly ends,
Electric current reverse recovery characteristic during IGCT normal turn-off is not met.Therefore need to add instead on the basis of original Thyristor Model
To recovery characteristics module, so as to establish out the Thyristor Model that can embody actual characteristic, in order to applied to various complicated crystalline substances
In brake tube circuit simulation.
The content of the invention
Proposed by the present invention is a kind of MATLAB model construction methods for emulating IGCT actual characteristic, its purpose purport
Overcoming the drawbacks described above present in prior art, the Reverse recovery curve of electric current in IGCT can be reflected, can be well
The sharp cut-off idealization defect of current curve in the Thyristor Model carried in MATLAB is made up, so as to embody IGCT mould
The actual characteristic of type.
The technical solution of the present invention：A kind of MATLAB models for emulating IGCT actual characteristic, its structure are bags
Original Thyristor Model 1, signal control module 2, enabled systems module 3 and afterflow module 4 in MATLAB are included, wherein original brilliant lock
The signal input part of the signal output part connection signal control module 2 of tube model 1, the signal output part of signal control module 2 connect
Connect the signal input part of enabled systems module 3, the signal output part of enabled systems module 3 continues the signal input part of flow module 4.
Its construction method, on the basis of the thyristor module 1 carried in MATLAB, for the original crystalline substance carried in MATLAB
Brake tube model 1, temporal logical operation is carried out by signal control module to the current value of collection, judges that current value reduces
At the time of being zero, the control signal as enabled systems module.To the current value of collection after differentiation element acts on as making
The input signal of energy system module.Judge whether electric current reaches reverse maximum by using enabled systems module again, if reaching
Afterflow module is controlled with certain exponential function rule output current signal, its current signal exported after to reverse maximum,
So as to produce the freewheel current of IGCT.On this basis, measurement port m voltage, electric current in original Thyristor Model 1 are believed
Number measure, by adding signal control module 2, enabled systems module 3 and afterflow module 4, to IGCT anode a, negative electrode
K, gate pole g and measurement port m re-start definition, so as to form newly-built Thyristor Model.
The beneficial effects of the invention are as follows：
1）The Thyristor Model of foundation can reflect the Reverse recovery curve of electric current in IGCT, can make up well
The sharp cut-off idealization defect of current curve in the Thyristor Model carried in MATLAB, so as to embody Thyristor Model
Actual characteristic；
2）The Thyristor Model of foundation can be with the mathematical modeling of unrestricted choice reverse recovery current, by changing enabled systems
Maximum reverse restoring current value and current attenuation exponential function formula in module, so as to reflect the IGCT with different qualities
Reverse recovery current curve, the model can be applied in various complicated thyristor circuits emulation, had suitable well
Answering property and autgmentability；
3）The Thyristor Model structure of foundation is relatively simple, easy to use, has stronger application value.
Brief description of the drawings
Fig. 1-1 is the VA characteristic curve figure of the IGCT with actual characteristic；
Fig. 1-2 is that the electric current for flowing through IGCT changes over time curve map；
Fig. 1 is the topological structure block diagram of the present invention；
Fig. 2 is case study on implementation MATLAB analogous diagrams of the present invention；
Fig. 3 and Fig. 4 is case study on implementation MATLAB simulation data oscillograms of the present invention；
Fig. 5 is the structural representation of new Thyristor Model 5；
Fig. 6 is the structural representation of signal control module 2；
Fig. 7 is the structural representation of enabled systems module 3；
Fig. 8 is the structural representation of Fcn modules；
Embodiment
A kind of MATLAB models for emulating IGCT actual characteristic, its structure be include it is original in MATLAB
Thyristor Model 1, signal control module 2, enabled systems module 3 and afterflow module 4, wherein original Thyristor Model
The signal input part of 1 signal output part connection signal control module 2, the signal output part connection of signal control module 2 are enabled
The signal input part of system module 3, the signal output part of enabled systems module 3 continue the signal input part of flow module 4,
Its construction method：On the basis of the thyristor module 1 carried in MATLAB, for the original crystalline substance carried in MATLAB
Brake tube model 1, temporal logical operation is carried out by signal control module to the current value of collection, judges that current value reduces
At the time of being zero, the control signal as enabled systems module.To the current value of collection after differentiation element acts on as making
The input signal of energy system module.Judge whether electric current reaches reverse maximum by using enabled systems module again, if reaching
Afterflow module is controlled with certain exponential function rule output current signal, its current signal exported after to reverse maximum,
So as to produce the freewheel current of IGCT.On this basis, measurement port m voltage, electric current in original Thyristor Model 1 are believed
Number measure, by adding signal control module 2, enabled systems module 3 and afterflow module 4, to IGCT anode a, negative electrode
K, gate pole g and measurement port m re-start definition, so as to form newly-built Thyristor Model.
Described carries out temporal logical operation using signal control module to the current value of collection, judges current value
At the time of being reduced to zero.The effect using enabled systems module and afterflow module is to produce the freewheel current of IGCT.
The newly-built Thyristor Model of described composition, the Reverse recovery curve of electric current in IGCT can be reflected, made up
The sharp cut-off idealization defect of electric current in the Thyristor Model carried in MATLAB, so as to embody the reality of Thyristor Model
Characteristic.
It is described form newly-built Thyristor Model can by change the maximum reverse restoring current value in enabled systems module and
Current attenuation exponential function formula, so as to reflect the Reverse recovery curve of the IGCT with different qualities, by the model application
In various complicated thyristor circuit emulation, there is good adaptability and autgmentability.
The input of the signal control module 2 is the signal output part of original Thyristor Model 1, and its output end is enabled
The signal input part of system module 3.
The input of the enabled systems module 3 is the signal output part of signal control module 2, and its output end is afterflow mould
The signal input part of block 4.
The input of the afterflow module 4 is the signal output part of enabled systems module 3, and its output end is original IGCT
The signal input part of model 1.
The new Thyristor Model 5 is by original Thyristor Model 1, signal control module 2, enabled systems module 3 and continues
Flow module 4 collectively forms.
Below in conjunction with the accompanying drawings with specific implementation case, the technical scheme that the present invention is furture elucidated：
The reversely restoring process of IGCT refers to IGCT after switch, removes be applied to IGCT anode and negative electrode suddenly
The forward voltage at both ends, and when two interpolars are applied with backward voltage, IGCT recovers the process of blocking ability by being conducting to.Root
According to the analysis to its reverse recovery characteristic curve, it can be assumed that its reverse recovery current reaches maximumAfterwards, with a certain peculiar
Into attenuation trend until to zero, exponential function is shown below exponential function rule, and its Reverse recovery electricity is established using the formula
Stream can make up the sharp cut-off idealization defect of electric current in the Thyristor Model carried in MATLAB well.
Although having carried the electrical model of thyristor device in MATLAB, because the model is only special comprising forward conduction
Property, deficiency is showed its reverse recovery characteristic, therefore original IGCT 1 need to be modeled again, increase electric in IGCT practice
The reverse recovery characteristic curve of stream, in order to more accurately simulate the switching process of IGCT.
A kind of as shown in figure 1, MATLAB modeling methods for emulating IGCT actual characteristic.The crystalline substance carried in MATLAB
On the basis of brake tube module 1, by adding signal control module 2, enabled systems module 3 and afterflow module 4, turned off in IGCT
Reverse recovery current is produced in journey, and by being surveyed to voltage, the current signal of measurement port m in original Thyristor Model 1
Amount, definition is re-started to IGCT anode a, negative electrode k, gate pole g and measurement port m.Therefore, by being carried out certainly to original model
Define and perfect, new Thyristor Model 5, which is smoothly built, to be come, as shown in Figure 5.
Detailed Thyristor are original thyristor modules 1 in MATLAB.On this basis, IGCT needs to pass through
Its current value is acquired signal control module 2 and logical operation, the Signal Control Subsystem modules in figure
As signal control module 2, the module are as shown in Figure 6.Accounted for according to the time of modeling, judge that thyristor module is decayed
When to zero, i.e., IGCT starts to bear backward voltage in 0.01s, therefore needs time module and steady state value 0.01s progress
Compare, on this basis, exported before 0.01s according to forward conduction electric current, according to enabled output after 0.01s.
IGCT needs the comparison operation by enabled systems module 3, so as to corresponding for controlling afterflow module 4 to produce
Current value.Enable Subsystem modules in figure are enabled systems module 3, and the module is as shown in Figure 7.When in IGCT
Electric current be down to zero after, its current changing rate is calculated by derivative moduleAs the input signal of enabled systems module 3,
Reverse current is produced by enabled systems module 3 and is used as output to control the conducting of controllable current source.Here reverse current is set
Maximum be 200A, when being not reaching to 200A, electric current continues to decline until reach 200A according to a certain speed, now electric current
Reduce straight zero according to the exponential law of setting.
Wherein reverse recovery current is in attenuation trend according to the exponential function relation of setting, and calculation formula is as follows.
Wherein,For maximum reverse current, 200A is taken here,
For maximum reverse recovery charge,
For time attenuation constant, 60 ~ 80 are typically taken, takes 70 here.
The Fcn modules established by above-mentioned formula are as shown in Figure 8.
IGCT needs to produce the freewheel current of IGCT by afterflow module 4, the Controlled Current in figure
Source modules are afterflow module 4.
Case study on implementation
The present invention can be emulated and verified by MATLAB/SIMULINK, and Fig. 2 is the MATLAB of case study on implementation of the present invention
Analogous diagram.Thyristor Model shown in figure is newly-built IGCT package module, wherein the positive voltage that applies is 200V, is reversely applied
Making alive is 1000V, by complementary conducting the breaker breaker1 and breaker2 of Pulse Width Control, realizes that IGCT is positive and anti-
To alternate conduction.Pulse frequency is 50Hz, and dutycycle 50%, when break1 is first closed, IGCT both ends apply positive electricity
Pressure, gate circuit transistor gate is started to provide trigger pulse, after waiting its stable conducting, disconnect break1, close break2, IGCT two
End starts to apply backward voltage, and it gradually recovers blocking state.
Fig. 3 is the output voltage wave of IGCT in the implementation case, and Fig. 4 is that the electric current of IGCT in the implementation case is defeated
Go out waveform.By simulation waveform, the voltage curve of newly-built Thyristor Model keeps constant, and current curve is with reversely extensive
Multiple characteristic.When IGCT is on be on the occasion of, it is consistent with original Thyristor Model, after bearing backward voltage in 0.01s
Start to reduce rapidly with certain speed, until after dropping to maximum current -200A, be restored to according to certain changing rule
Zero.This current characteristic curve more meets the actual characteristic of IGCT, therefore the modeling method is feasible.
Claims (5)
- A kind of 1. construction method for the MATLAB models for emulating IGCT actual characteristic, it is characterized in that being carried in MATLAB Thyristor module on the basis of, for the original Thyristor Model carried in MATLAB, signal control is passed through to the current value of collection Molding block carries out temporal logical operation, at the time of judging that current value is reduced to zero, the control as enabled systems module Signal；To the input signal of the current value of collection after differentiation element acts on as enabled systems module；Again by using making Energy system module judges whether electric current reaches reverse maximum, if with predetermined exponential function rule after reaching reverse maximum Output current signal, its current signal exported control afterflow module, so as to produce the freewheel current of IGCT；It is basic herein On, voltage, the current signal of measurement port m in original Thyristor Model are measured, by adding signal control module, making Energy system module and afterflow module, definition is re-started to IGCT anode, negative electrode, gate pole and measurement port, new so as to form Build Thyristor Model.
- A kind of 2. structure of MATLAB models for emulating IGCT actual characteristic according to claim 1Method, it is characterised in that：Described carries out temporal logical operation using signal control module to the current value of collection, At the time of judging that current value is reduced to zero.
- A kind of 3. structure of MATLAB models for emulating IGCT actual characteristic according to claim 1Method, it is characterised in that：The described effect using enabled systems module and afterflow module is to produce the afterflow of IGCT Electric current.
- A kind of 4. structure of MATLAB models for emulating IGCT actual characteristic according to claim 1Method, it is characterised in that：The newly-built Thyristor Model of described composition, it can reflect that the Reverse recovery of electric current in IGCT is bent Line, the sharp cut-off idealization defect of electric current in the Thyristor Model carried in MATLAB is made up, so as to embody IGCT mould The actual characteristic of type.
- A kind of 5. structure of MATLAB models for emulating IGCT actual characteristic according to claim 1Method, it is characterised in that：The newly-built Thyristor Model of composition can be by changing the maximum reverse in enabled systems module Restoring current value and current attenuation exponential function formula, so as to reflect the Reverse recovery curve of the IGCT with different qualities, The model is applied in various complicated thyristor circuit emulation, there is good adaptability and autgmentability.
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