CN110244210A - A kind of breakdown detection method for IGBT unit - Google Patents
A kind of breakdown detection method for IGBT unit Download PDFInfo
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- CN110244210A CN110244210A CN201910601552.0A CN201910601552A CN110244210A CN 110244210 A CN110244210 A CN 110244210A CN 201910601552 A CN201910601552 A CN 201910601552A CN 110244210 A CN110244210 A CN 110244210A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G01R31/261—Circuits therefor for testing bipolar transistors for measuring break-down voltage or punch through voltage therefor
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Abstract
The present invention relates to IGBT to puncture detection technique field, in particular to a kind of breakdown detection method for IGBT unit, by obtaining the curent change number of in running order IGBT unit in one cycle, the curent change number that will acquire is made comparisons with preset base current change frequency, by judging whether the curent change number that gets and preset base current change frequency equally determine whether in running order IGBT unit has breakdown, the breakdown situation of the flash driving of IGBT unit can be quickly detected, the case where flash driving breakdown of IGBT unit can be detected in 300ms；And without carrying out working condition switching and driving method switching, the stability of the efficiency and power that improve breakdown detection is high.
Description
Technical field
The present invention relates to IGBT to puncture detection technique field, in particular to a kind of breakdown detection side for IGBT unit
Method.
Background technique
Insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT), be by
The compound full-control type voltage driven type power semiconductor of BJT (double pole triode) and MOS (insulating gate type field effect tube) composition
Device has advantage of both the high input impedance of MOSFET and the low conduction voltage drop of GTR concurrently.GTR saturation pressure reduces, and current-carrying is close
Degree is big, but driving current is larger；MOSFET driving power very little, switching speed is fast, but conduction voltage drop is big, and current carrying density is small.
IGBT combines the advantages of both the above device, and driving power is small and saturation pressure reduces.Being highly suitable to be applied for DC voltage is
The fields such as the converter system of 600V or more such as alternating current generator, frequency converter, Switching Power Supply, lighting circuit, Traction Drive.
IGBT during the work time there is a phenomenon where breakdown be it is more typical, cause that IGBT punctures because being known as very much,
Such as: overcurrent, over-voltage, excessively mild short circuit etc. all may cause IGBT and puncture.With the development of semiconductor switch technology, partly
Conductor switching device is widely used in the equipment such as electric welding machine, frequency converter, SVG, flexible DC transmission.Equipment produce,
Debugging, transport, field maintenance or often inevitably semiconductor devices (such as IGBT) damages when reprocessing.It is damaged in device
In the case where bad, once device power is run, easily lead to the straight-through damage of IGBT, will lead to whole equipment when serious completely or portion
Divide demolition.Therefore especially it is necessary to provide a kind of methods that can be used to detect IGBT breakdown.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of method of breakdown for capableing of efficient detection TGBT unit.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of breakdown detection method for IGBT unit, comprising the following steps:
S1, default base current change frequency；
S2, the curent change number of in running order IGBT unit in one cycle is obtained；
S3, judge whether the curent change number of in running order IGBT unit in one cycle is equal to the base
Plinth curent change number；
S4, if it is not, then determining that in running order IGBT unit has breakdown.
The beneficial effects of the present invention are:
This programme will acquire by obtaining the curent change number of in running order IGBT unit in one cycle
To curent change number make comparisons with preset base current change frequency, by judge the curent change number that gets with
Whether preset base current change frequency equally determines whether in running order IGBT unit has breakdown, can be quick
The breakdown situation for detecting the flash driving of IGBT unit can detect the flash driving breakdown of IGBT unit in 300ms
The case where；And without carrying out working condition switching and driving method switching, the efficiency of breakdown detection and the stabilization of power are improved
Performance is high；The breakdown detection method of book conceptual design directly can carry out breakdown inspection in running order IGBT unit
Survey, the accuracy height of detection and the normal work that will not influence IGBT unit can also stop exporting in time when breaking down
And fault message is fed back into server, staff is waited to repair it.
Detailed description of the invention
Fig. 1 is a kind of step flow chart of the breakdown detection method for IGBT unit according to the present invention；
Fig. 2 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 48%
When without breakdown situation current output waveform figure；
Fig. 3 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 48%
When have breakdown situation current output waveform figure；
Fig. 4 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 48%
When have breakdown situation current output waveform figure；
Fig. 5 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 60%
When without breakdown situation current output waveform figure；
Fig. 6 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 60%
When have breakdown situation current output waveform figure；
Fig. 7 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 60%
When have breakdown situation current output waveform figure；
Fig. 8 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 98%
When without breakdown situation current output waveform figure；
Fig. 9 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is 98%
When have breakdown situation current output waveform figure；
Figure 10 is that a kind of IGBT unit duty ratio of breakdown detection method for IGBT unit according to the present invention is
The current output waveform figure for having breakdown situation when 98%.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: the curent change number and preset base current that are got by judgement become
Change whether number equally determines whether in running order IGBT unit has breakdown, IGBT unit can be quickly detected
The breakdown situation of flash driving.
Fig. 1 is please referred to, technical solution provided by the invention:
A kind of breakdown detection method for IGBT unit, comprising the following steps:
S1, default base current change frequency；
S2, the curent change number of in running order IGBT unit in one cycle is obtained；
S3, judge whether the curent change number of in running order IGBT unit in one cycle is equal to the base
Plinth curent change number；
S4, if it is not, then determining that in running order IGBT unit has breakdown.
As can be seen from the above description, the beneficial effects of the present invention are:
This programme will acquire by obtaining the curent change number of in running order IGBT unit in one cycle
To curent change number make comparisons with preset base current change frequency, by judge the curent change number that gets with
Whether preset base current change frequency equally determines whether in running order IGBT unit has breakdown, can be quick
The breakdown situation for detecting the flash driving of IGBT unit can detect the flash driving breakdown of IGBT unit in 300ms
The case where；And without carrying out working condition switching and driving method switching, the efficiency of breakdown detection and the stabilization of power are improved
Performance is high；The breakdown detection method of book conceptual design directly can carry out breakdown inspection in running order IGBT unit
Survey, the accuracy height of detection and the normal work that will not influence IGBT unit can also stop exporting in time when breaking down
And fault message is fed back into server, staff is waited to repair it.
Further, the tool for obtaining the curent change number of in running order IGBT unit in one cycle
Body step are as follows:
S21, preset reference current value；
S22, the stabling current value of the IGBT unit in one cycle is successively acquired；
S23, each collected stabling current value is made comparisons with the reference current value respectively, obtains corresponding electricity
Flow difference；
S24, successively judge whether continuous three current differentials are all larger than default change threshold；
S25, if so, the curent change number of record IGBT unit and storing current continuous three stabling currents
Value, using the stabling current value of the last one in current continuous three stabling current values as new base current
Value.
Further, further includes:
The initial value of predetermined current change frequency；
Continuous three current differentials are calculated with the reference current value respectively, obtain three current differentials, are made
For the judgment basis of one group of curent change；
If detecting, one group of continuous three current differentials are all larger than default change threshold, by curent change number
Initial value adds one.
Further, the IGBT unit includes IGBT1 unit and IGBT2 unit, the IGBT1 unit with it is described
The electrical connection of IGBT2 unit；
Obtain the tool of the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle
Body step are as follows:
Preset reference current value；
One period is divided into first interval and second interval；
It is mono- successively to acquire IGBT2 in second interval for the stabling current value that IGBT1 unit is successively acquired in first interval
The stabling current value of member；
Each the stabling current value for collecting IGBT1 unit and IGBT2 unit is made with preset reference current value respectively
Compare, obtains corresponding current differential；
Successively judge whether continuous three current differentials are all larger than default variation threshold in IGBT1 unit and IGBT2 unit
Value；
If so, the curent change number of record IGBT1 unit and IGBT2 unit and storing IGBT1 unit and IGBT2 is mono-
Current continuous three stabling current values in member, it is steady by continuous three current in the IGBT1 unit and IGBT2 unit
A last collected stabling current value in constant current value is new respectively as the IGBT1 unit and IGBT2 unit
Base current value.
Seen from the above description, by the way that a cycle is divided into first interval and second interval, first interval being capable of root
According to IGBT1 cell current change frequency judge IGBT1 unit flash pipe breakdown the case where, second interval being capable of basis
IGBT2 cell current change frequency judges the case where tube edge pipe breakdown of IGBT2 unit.
Further, the electric current change of in running order IGBT1 unit and IGBT2 unit in one cycle is being obtained
It is further comprising the steps of after changing number:
Whether judge the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle
Equal to default base current change frequency；
If the curent change number of in running order IGBT1 unit in one cycle is not equal to default base current
Change frequency then determines that IGBT1 unit has breakdown；
If the curent change number of in running order IGBT2 unit in one cycle is not equal to default base current
Change frequency then determines that IGBT2 unit has breakdown；
If the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle is not equal to
Default base current change frequency, then determine that IGBT1 unit and IGBT2 unit have breakdown.
Seen from the above description, by the way that a cycle is divided into first interval and second interval, first interval being capable of root
According to IGBT1 cell current change frequency judge IGBT1 unit flash pipe breakdown the case where, second interval being capable of basis
IGBT2 cell current change frequency judges the case where tube edge pipe breakdown of IGBT2 unit.
Further, the IGBT unit includes IGBT1 unit and IGBT2 unit, the IGBT1 unit with it is described
The electrical connection of IGBT2 unit, the curent change number of the IGBT unit in one cycle are 1-4 times, and the IGBT1 unit exists
Curent change number in a cycle is 1-2 times, and the curent change number of the IGBT2 unit in one cycle is 1-2
It is secondary.
Seen from the above description, when IGBT unit includes IGBT1 unit and IGBT2 unit, the IGBT unit is one
Curent change number in a period is 1-4 times, the curent change number of corresponding IGBT unit in the case where different duty
Also be different, still, as long as detected in corresponding duty ratio curent change number and preset curent change number (
Exactly in normal condition, that is, IGBT, there is a situation where puncture) different it can be determined with breakdown.
Please refer to Fig. 1 to Figure 10, the embodiment of the present invention one are as follows:
A kind of breakdown detection method for IGBT unit, comprising the following steps:
S1, default base current change frequency；
S2, the curent change number of in running order IGBT unit in one cycle is obtained；
S3, judge whether the curent change number of in running order IGBT unit in one cycle is equal to the base
Plinth curent change number；
S4, if it is not, then determining that in running order IGBT unit has breakdown.
The specific steps for obtaining the curent change number of in running order IGBT unit in one cycle are as follows:
S21, preset reference current value；
S22, the stabling current value of the IGBT unit in one cycle is successively acquired；
S23, each collected stabling current value is made comparisons with the reference current value respectively, obtains corresponding electricity
Flow difference；
S24, successively judge whether continuous three current differentials are all larger than default change threshold；
S25, if so, the curent change number of record IGBT unit and storing current continuous three stabling currents
Value, using the stabling current value of the last one in current continuous three stabling current values as new base current
Value.
Further include:
The initial value of predetermined current change frequency；
Continuous three current differentials are calculated with the reference current value respectively, obtain three current differentials, are made
For the judgment basis of one group of curent change；
If detecting, one group of continuous three current differentials are all larger than default change threshold, by curent change number
Initial value adds one.If detecting, two groups of continuous three current differentials are all larger than default change threshold, current convertor variation
Number is just recorded as twice, likewise, corresponding curent change number is three times if three groups.
The IGBT unit includes IGBT1 unit and IGBT2 unit, and the IGBT1 unit is electrically connected with the IGBT2 unit
It connects；
Obtain the tool of the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle
Body step are as follows:
Preset reference current value；
One period is divided into first interval and second interval；
It is mono- successively to acquire IGBT2 in second interval for the stabling current value that IGBT1 unit is successively acquired in first interval
The stabling current value of member；
Each the stabling current value for collecting IGBT1 unit and IGBT2 unit is made with preset reference current value respectively
Compare, obtains corresponding current differential；
Successively judge whether continuous three current differentials are all larger than default variation threshold in IGBT1 unit and IGBT2 unit
Value；
If so, the curent change number of record IGBT1 unit and IGBT2 unit and storing IGBT1 unit and IGBT2 is mono-
Current continuous three stabling current values in member, it is steady by continuous three current in the IGBT1 unit and IGBT2 unit
A last collected stabling current value in constant current value is new respectively as the IGBT1 unit and IGBT2 unit
Base current value.
The first interval be [0%, 50%) period, second interval be [50%, 100%) period.
After obtaining the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle,
It is further comprising the steps of:
Whether judge the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle
Equal to default base current change frequency；
If the curent change number of in running order IGBT1 unit in one cycle is not equal to default base current
Change frequency then determines that IGBT1 unit has breakdown；
If the curent change number of in running order IGBT2 unit in one cycle is not equal to default base current
Change frequency then determines that IGBT2 unit has breakdown；
If the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle is not equal to
Default base current change frequency, then determine that IGBT1 unit and IGBT2 unit have breakdown.
The IGBT unit includes IGBT1 unit and IGBT2 unit, and the IGBT1 unit is electrically connected with the IGBT2 unit
It connects, the curent change number of the IGBT unit in one cycle is 1-4 times, and the IGBT1 unit is in one cycle
Curent change number is 1-2 times, and the curent change number of the IGBT2 unit in one cycle is 1-2 times.
The specific embodiment of the above-mentioned breakdown detection method for IGBT unit are as follows:
A cycle is indicated with T, a cycle is divided into first interval (being indicated with T1) and second interval (with T2 table
Show), T1 be T [0%, 50%) period, T2 be T [50%, 100%) period；
The curent change number for obtaining T1, T2 and T is denoted as C1, C2 and C respectively；
Change threshold is set as 4A, and the initial value of reference current value is 0A；
At the T1 moment, if collected continuous three stabling current values are 10A, 10.1A and 9.9A；
At the T2 moment, if collected continuous three stabling current values are 10.02A, 9.98A and 10.1A；
It is respectively then 10A, 10.1A and 9.9A in the corresponding current difference that T1 moment and base current value are calculated, by
Be all larger than 4A (change threshold) in 10A, 10.1A and 9.9A, thus recordable curent change number be it is primary, to judge back at this time
Whether the current differential that collected stabling current value and base current value calculate is greater than change threshold, before system can be automatically stored
Three continuous-stable current values of face acquisition and using the last one collected stabling current value as new base current value,
That is this is new using 9.9A base current value is followed by as the foundation of judgement, if continuing to test below continuous to three
Stabling current value be respectively 15A, 14.7A and 14.9A, due to 15-9.9=5.1A > 4A, 14.7-9.9=4.8A > 4A,
14.9-9.9=5A > 4A, then can continue record current change frequency is twice, if continuing to test below continuous stable to three
Current value is respectively 13A, 14.7A and 14.9A, due to 13-9.9=3.1A<4A, 14.7-9.9=4.8A>4A and 14.9-9.9
=5A > 4A does not meet the condition of curent change number record then, and it is primary that curent change number, which is appointed so,；
Likewise, the T2 moment deterministic process such as the above-mentioned T1 moment, be not detailed herein.
It is this programme IGBT unit, IGBT1 unit and IGBT2 unit below in one cycle in the case of different duty
Current output waveform figure, this specific implementation includes three kinds therein, as follows:
Duty ratio refers to that in a pulse cycle, conduction time is relative to ratio shared by total time, duty ratio
(Duty Ratio) has following meaning in the field of telecommunications: for example: 1 μ s of pulse width, the pulse train duty of 4 μ s of signal period
Than being 0.25, that is to say, that, it is assumed that a cycle is 100%, has worked 40%, then duty ratio is exactly 40%/100%=
0.4。
The first situation: duty ratio=45%；
First figure referring to figure 2. is IGBT1 cell current output waveform figure, and second figure is IGBT2 cell current
Output waveform figure, third figure is IGBT cell current output waveform figure (i.e. IGBT1 unit and the superimposed electricity of IGBT2 unit
Flow output waveform figure)
IGBT cell current output waveform figure in referring to figure 2., [0%, 50%) section, (1) 0%T moment, IGBT
The electric current of unit, which is exported from 0A, becomes 10A；(2) at the 45%T moment, the electric current of IGBT unit, which is exported from 10A, becomes 0A, then in T1
=[0%, 50%) period when, the curent change number of IGBT1 unit C1=2 times；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 10A；(2) exist
At the 90%T moment, the electric current of IGBT unit, which is exported from 10A, becomes 0A, then T2=[50%, 100%) period when, IGBT2 unit
Curent change number C2=2 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 10A；(2) 45%T
At the moment, the electric current of IGBT unit, which is exported from 10A, becomes 0A；(3) the electric current output at 50%T moment, IGBT unit becomes from 0A
10A；(4) the 90%T moment, the electric current of IGBT unit, which is exported from 10A, becomes 0A, then T=[0%, 100%) period when, IGBT
The curent change number of unit C=4 times；
Fig. 2 is IGBT1 unit, IGBT2 unit and IGBT unit there is no the current output waveform figures of breakdown, also
It is to say, in IGBT1 unit, IGBT2 unit and IGBT unit when there is no breakdown, corresponding curent change number is respectively
C1=2 times, C2=2 times and C=4 times, as long as detecting the curent change number of IGBT1 unit, IGBT2 unit and IGBT unit
Unequal breakdown has been decided that with C1=2 times, C2=2 times and C=4 times.
It referring to figure 3., is a kind of current output waveform figure of IGBT unit, i.e., after IGBT1 unit and the superposition of IGBT2 unit
Current output waveform figure；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 10A；(2) when 45%T
Carve, the output of the electric current of IGBT unit is 10A, then T1=[0%, 50%) period, the curent change number C1=of IGBT1 unit
1 time；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 20A
Between initial baseline electric current be all 0A)；(2) the 90%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then in T2=
[50%, 100%) period, the curent change number of IGBT2 unit C2=2 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 10A；(2) 50%T
At the moment, the electric current of IGBT unit, which is exported from 10A, becomes 20A；(3) the electric current output at 90%T moment, IGBT unit becomes from 20A
10A, then T=[0%, 100%) period when, the curent change number of IGBT unit C=3 times；
It follows that the corresponding curent change of IGBT1 unit, IGBT2 unit and IGBT unit in the waveform diagram of Fig. 3
Number is respectively C1=1 times, C2=2 times and C=3 times, due to C1=1 ≠ 2 and C=3 ≠ 4, it is possible to which judgement is IGBT1 unit
Flash pipe have breakdown.
It referring to figure 4., is another current output waveform figure of IGBT unit, i.e. IGBT1 unit and IGBT2 unit is superimposed
Current output waveform figure afterwards；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 10A；(2) when 45%T
Carve, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T1=[0%, 50%) period, the curent change of IGBT1 unit
Number C1=2 times；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 10A
Between initial baseline electric current be all 0A)；(2) at the 90%T moment, the electric current output of IGBT unit is 10A, then T2=[50%,
100%) period, the curent change number of IGBT2 unit C2=1 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 50%T
At the moment, the electric current of IGBT unit, which is exported from 10A, becomes 20A；(3) the electric current output at 90%T moment, IGBT unit is 10A, then exists
T=[0%, 100%) period when, the curent change number of IGBT unit C=3 times；
It follows that the corresponding curent change of IGBT1 unit, IGBT2 unit and IGBT unit in the waveform diagram of Fig. 4
Number is respectively C1=2 times, C2=1 times and C=3 times, due to C2=1 ≠ 2 and C=3 ≠ 4, it is possible to which judgement is IGBT2 unit
Flash pipe have breakdown.
Second situation: duty ratio=60%；
First figure referring to figure 5. is IGBT1 cell current output waveform figure, and second figure is IGBT2 cell current
Output waveform figure, third figure is IGBT cell current output waveform figure (i.e. IGBT1 unit and the superimposed electricity of IGBT2 unit
Flow output waveform figure)
IGBT cell current output waveform figure in referring to figure 5., [0%, 50%) section, (1) 0%T moment, IGBT
The electric current of unit, which is exported from 0A, becomes 20A；(2) the 10%T moment, the electric current of IGBT unit, which is exported from 10A, becomes 0A, then in T1=
[0%, 50%) period when, the curent change number of IGBT1 unit C1=2 times；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 60%
At the T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T2=[50%, 100%) period when, the electricity of IGBT2 unit
Stream change frequency C2=2 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 10%T
At the moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A；(3) the electric current output at 50%T moment, IGBT unit becomes from 10A
20A；(4) the 60%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T=[0%, 100%) period when, IGBT
The curent change number of unit C=4 times；
Fig. 5 is IGBT1 unit, IGBT2 unit and IGBT unit there is no the current output waveform figures of breakdown, also
It is to say, in IGBT1 unit, IGBT2 unit and IGBT unit when there is no breakdown, corresponding curent change number is respectively
C1=2 times, C2=2 times and C=4 times, as long as detecting the curent change number of IGBT1 unit, IGBT2 unit and IGBT unit
Unequal breakdown has been decided that with C1=2 times, C2=2 times and C=4 times.
Fig. 6 is please referred to, is a kind of current output waveform figure of IGBT unit, i.e., after IGBT1 unit and the superposition of IGBT2 unit
Current output waveform figure；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) when 10%T
Carve, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T1=[0%, 50%) period, the curent change of IGBT1 unit
Number C1=2 times；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 20A
Between initial baseline electric current be all 0A)；(2) at the 90%T moment, the electric current output of IGBT unit is 20A, then T2=[50%,
100%) period, the curent change number of IGBT2 unit C2=1 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 10%T
At the moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A；(3) the electric current output at 50%T moment, IGBT unit becomes from 10A
20A；(4) the 90%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T=[0%, 100%) period when, IGBT
The curent change number of unit C=3 times；
It follows that the corresponding curent change of IGBT1 unit, IGBT2 unit and IGBT unit in the waveform diagram of Fig. 6
Number is respectively C1=2 times, C2=1 times and C=3 times, due to C2=1 ≠ 2 and C=3 ≠ 4, it is possible to which judgement is IGBT2 unit
Flash pipe have breakdown.
Fig. 7 is please referred to, is another current output waveform figure of IGBT unit, is i.e. IGBT1 unit and the superposition of IGBT2 unit
Current output waveform figure afterwards；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) when 10%T
Carve, the output of the electric current of IGBT unit is 20A, then T1=[0%, 50%) period, the curent change number C1=of IGBT1 unit
1 time；
[50%, 100%) section, at (1) 50%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 20A
Between initial baseline electric current be all 0A)；(2) the 60%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then in T2=
[50%, 100%) period, the curent change number of IGBT2 unit C2=2 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 10%T
The electric current output at moment, IGBT unit is 20A；(3) the electric current output at 90%T moment, IGBT unit is 10A；(4) when 60%T
It carves, the electric current of IGBT unit, which is exported from 20A, becomes 10A；Then T=[0%, 100%) period when, the curent change of IGBT unit
Number C=2 times；
It follows that the corresponding curent change of IGBT1 unit, IGBT2 unit and IGBT unit in the waveform diagram of Fig. 7
Number is respectively C1=1 times, C2=2 times and C=2 times, due to C2=1 ≠ 2 and C=2 ≠ 4, it is possible to which judgement is IGBT2 unit
Flash pipe have breakdown.
The third situation: duty ratio=98%；
First figure for please referring to Fig. 8 is IGBT1 cell current output waveform figure, and second figure is IGBT2 cell current
Output waveform figure, third figure is IGBT cell current output waveform figure (i.e. IGBT1 unit and the superimposed electricity of IGBT2 unit
Flow output waveform figure)
The IGBT cell current output waveform figure in Fig. 8 is please referred to, [0%, 50%) section, (1) 0%T moment, IGBT
The electric current of unit, which is exported from 0A, becomes 10A, and at (2) 48%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then in T1
=[0%, 50%) period when, the curent change number of IGBT1 unit C1=2 times；
[50%, 100%) section, at (1) 52%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) exist
At the 98%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T2=[50%, 100%) period when, IGBT2 unit
Curent change number C2=2 times；
Fig. 8 is IGBT1 unit, IGBT2 unit and IGBT unit there is no the current output waveform figures of breakdown, also
It is to say, in IGBT1 unit, IGBT2 unit and IGBT unit when there is no breakdown, corresponding curent change number is respectively
C1=2 times, C2=2 times and C=4 times, as long as detecting the curent change number of IGBT1 unit, IGBT2 unit and IGBT unit
Unequal breakdown has been decided that with C1=2 times, C2=2 times and C=4 times.
Fig. 9 is please referred to, is a kind of current output waveform figure of IGBT unit, i.e., after IGBT1 unit and the superposition of IGBT2 unit
Current output waveform figure；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) when 48%T
Carve, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T1=[0%, 50%) period, the curent change of IGBT1 unit
Number C1=2 times；
[50%, 100%) section, at (1) 52%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 20A
Between initial baseline electric current be all 0A)；(2) the 98%T moment, IGBT unit electric current output be 20A, then T2=[50%,
100%) period, the curent change number of IGBT2 unit C2=1 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 48%T
At the moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A；(3) the electric current output at 52%T moment, IGBT unit becomes from 10A
20A；(4) the 98%T moment, IGBT unit electric current output be 20A, then T=[0%, 100%) period when, IGBT unit
Curent change number C=3 times；
It follows that the corresponding curent change of IGBT1 unit, IGBT2 unit and IGBT unit in the waveform diagram of Fig. 9
Number is respectively C1=2 times, C2=1 times and C=3 times, due to C2=1 ≠ 2 and C=3 ≠ 4, it is possible to which judgement is IGBT2 unit
Flash pipe have breakdown.
Figure 10 is please referred to, is another current output waveform figure of IGBT unit, is i.e. IGBT1 unit and IGBT2 unit is folded
Current output waveform figure after adding；
[0%, 50%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) when 48%T
Carve, the output of the electric current of IGBT unit is 20A, then T1=[0%, 50%) period, the curent change number C1=of IGBT1 unit
1 time；
[50%, 100%) section, at (1) 52%T moment, the electric current of IGBT unit, which is exported from 0A, becomes (each area 20A
Between initial baseline electric current be all 0A)；(2) the 98%T moment, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then in T2=
[50%, 100%) period, the curent change number of IGBT2 unit C2=2 times；
[0%, 100%) section, at (1) 0%T moment, the electric current of IGBT unit, which is exported from 0A, becomes 20A；(2) 48%T
The electric current output at moment, IGBT unit is 20A；(3) the electric current output at 52%T moment, IGBT unit is 20A；(4) when 98%T
Carve, the electric current of IGBT unit, which is exported from 20A, becomes 10A, then T=[0%, 100%) period when, the curent change of IGBT unit
Number C=2 times；
It follows that IGBT1 unit, IGBT2 unit and the corresponding curent change of IGBT unit in the waveform diagram of Figure 10
Number is respectively C1=1 times, C2=2 times and C=2 times, due to C2=1 ≠ 2 and C=2 ≠ 4, it is possible to which judgement is IGBT2 mono-
The flash pipe of member has breakdown.
IGBT unit further includes IGBT3 unit, IGBT4 unit, IGBT5 unit, IGBT6 unit ... IGBTn unit, if
It is standby can be according to using the size of power suitably to select the number of IGBT unit, IGBT unit can be selected multiple when high-power
IGBT unit, the breakdown detection method of above-mentioned IGBT1 unit and the breakdown detection method of IGBT2 unit are equally applicable to
The breakdown detection of IGBT3 unit, IGBT4 unit, IGBT5 unit, IGBT6 unit ... IGBTn unit.
In conclusion a kind of breakdown detection method for IGBT unit provided by the invention, is in work by obtaining
The curent change number of the IGBT unit of state in one cycle, the curent change number that will acquire and preset basis electricity
Stream change frequency is made comparisons, and whether the curent change number and preset base current change frequency got by judgement
Whether the IGBT unit to determine in running order has breakdown, can be quickly detected the breakdown of the flash driving of IGBT unit
Situation can detect the case where flash driving of IGBT unit punctures in 300ms；And without carrying out working condition switching
Switch with driving method, the stability of the efficiency and power that improve breakdown detection is high；The breakdown detection side of book conceptual design
Method directly can carry out breakdown detection in running order IGBT unit, and the accuracy of detection is high and to will not influence IGBT mono-
The normal work of member can also stop output in time and fault message is fed back to server to wait work when breaking down
Personnel repair it.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (6)
1. a kind of breakdown detection method for IGBT unit, which comprises the following steps:
S1, default base current change frequency；
S2, the curent change number of in running order IGBT unit in one cycle is obtained；
S3, judge whether the curent change number of in running order IGBT unit in one cycle is equal to the basis electricity
Flow change frequency；
S4, if it is not, then determining that in running order IGBT unit has breakdown.
2. the breakdown detection method according to claim 1 for IGBT unit, which is characterized in that
The specific steps for obtaining the curent change number of in running order IGBT unit in one cycle are as follows:
S21, preset reference current value；
S22, the stabling current value of the IGBT unit in one cycle is successively acquired；
S23, each collected stabling current value is made comparisons with the reference current value respectively, obtains corresponding current difference
Value；
S24, successively judge whether continuous three current differentials are all larger than default change threshold；
S25, if so, the curent change number of record IGBT unit and store current continuous three stabling current values, will
The stabling current value of the last one in current continuous three stabling current values is as new base current value.
3. the breakdown detection method according to claim 2 for IGBT unit, which is characterized in that further include:
The initial value of predetermined current change frequency；
Continuous three current differentials are calculated with the reference current value respectively, three current differentials are obtained, as one
The judgment basis of group curent change；
If detecting, one group of continuous three current differentials are all larger than default change threshold, by the initial of curent change number
Value plus one.
4. the breakdown detection method according to claim 1 for IGBT unit, which is characterized in that the IGBT unit packet
IGBT1 unit and IGBT2 unit are included, the IGBT1 unit is electrically connected with the IGBT2 unit；
Obtain the specific step of the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle
Suddenly are as follows:
Preset reference current value；
One period is divided into first interval and second interval；
The stabling current value that IGBT1 unit is successively acquired in first interval, successively acquires IGBT2 unit in second interval
Stabling current value；
Each the stabling current value for collecting IGBT1 unit and IGBT2 unit is made comparisons with preset reference current value respectively,
Obtain corresponding current differential；
Successively judge whether continuous three current differentials are all larger than default change threshold in IGBT1 unit and IGBT2 unit；
If so, recording the curent change number of IGBT1 unit and IGBT2 unit and storing in IGBT1 unit and IGBT2 unit
Current continuous three stabling current values stablize electricity for continuous three current in the IGBT1 unit and IGBT2 unit
The new basis of a last collected stabling current value in flow valuve respectively as the IGBT1 unit and IGBT2 unit
Current value.
5. the breakdown detection method according to claim 4 for IGBT unit, which is characterized in that be in work obtaining
It is further comprising the steps of after the curent change number of the IGBT1 unit and IGBT2 unit of state in one cycle:
Judge whether the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle is equal to
Default base current change frequency；
If the curent change number of in running order IGBT1 unit in one cycle is not equal to default base current variation
Number then determines that IGBT1 unit has breakdown；
If the curent change number of in running order IGBT2 unit in one cycle is not equal to default base current variation
Number then determines that IGBT2 unit has breakdown；
If the curent change number of in running order IGBT1 unit and IGBT2 unit in one cycle is not equal to default
Base current change frequency then determines that IGBT1 unit and IGBT2 unit have breakdown.
6. the breakdown detection method according to claim 1 for IGBT unit, which is characterized in that the IGBT unit packet
IGBT1 unit and IGBT2 unit are included, the IGBT1 unit is electrically connected with the IGBT2 unit, and the IGBT unit is at one
Curent change number in period is 1-4 times, and the curent change number of the IGBT1 unit in one cycle is 1-2 times, institute
Stating the curent change number of IGBT2 unit in one cycle is 1-2 times.
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