CN109687697A - IPM protection method, IPM protection device, storage medium and IPM module - Google Patents
IPM protection method, IPM protection device, storage medium and IPM module Download PDFInfo
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- CN109687697A CN109687697A CN201811519012.XA CN201811519012A CN109687697A CN 109687697 A CN109687697 A CN 109687697A CN 201811519012 A CN201811519012 A CN 201811519012A CN 109687697 A CN109687697 A CN 109687697A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The invention discloses an IPM protection method, a device, a storage medium and an IPM module, wherein the method comprises the following steps: acquiring a current signal of the IPM; determining whether an IGBT inside the IPM is abnormal according to the current signal, and/or determining whether the current signal exceeds a current threshold of the IPM; and if at least one fault condition that the IGBT is abnormal and the current signal exceeds the current threshold exists, controlling the IPM to stop working. The scheme of the invention can solve the problem of high operation failure rate of the IPM module under the defect condition caused by the incapability of identifying the defect condition of the IPM module, and achieves the effect of reducing the operation failure rate.
Description
Technical field
The invention belongs to electronic circuit technology fields, and in particular to a kind of guard method of IPM, device, storage medium and
IPM module more particularly to detection method, device, storage medium and the IPM module of the failure of IPM bridge arm.
Background technique
Critical power ratio device of the IPM (Intelligent Power Module, i.e. intelligent power module) as inversion,
In actual moving process, it is operating abnormally since one or more of which IGBT failure causes system, how accurately to IPM
Internal IGBT state is detected, and is reduced since IPM defect causes the more major break down of system, the whole loss for reducing system is one
A important research contents.And in existing control technology, to the detection technique of the not no active of the inside IPM bridge arm exception defect.
Summary of the invention
It is an object of the present invention in view of the foregoing drawbacks, provide the guard method of IPM a kind of, device, storage medium and
IPM module causes IPM module in defective situation to solve not identifying the defect situation of IPM module in the prior art
The high problem of operation troubles rate achievees the effect that reduce operation troubles rate.
The present invention provides the guard method of IPM a kind of, comprising: obtains the current signal of the IPM；Believed according to the electric current
Number determine whether the IGBT inside the IPM abnormal, and/or, determine the current signal whether be more than the IPM current threshold
Value；The IGBT exception, the current signal are more than at least one of current threshold failure situations if it exists, then control
The IPM stops working.
Optionally, the current signal of the IPM is obtained, comprising: in the case where the IPM not running, by described
The mode of IPM injecting voltage obtains the current signal that IGBT is flowed through in the IPM；Alternatively, in the case where IPM operation,
Obtain the current signal that IGBT is flowed through in the IPM.
Optionally, wherein the electric current letter that IGBT is flowed through in the IPM is obtained by way of to the IPM injecting voltage
Number, comprising: in such a way that the PWM drive signal to the IPM is adjusted, phase IGBT each in IPM injection is set
After constant voltage, the current signal that phase IGBT is flowed through in the IPM is detected；Alternatively, being obtained in the case where IPM operation
The current signal of IGBT is flowed through in the IPM, comprising: the IPM operation in the case where, detect flowed through in the IPM it is each
The current signal of phase IGBT.
Optionally, determine whether the IGBT inside the IPM is abnormal according to the current signal, comprising: if in the IPM
The current signal of three-phase IGBT is asymmetric, then the IGBT exists abnormal.
Optionally, if the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exists abnormal, comprising: if
The current signal of a phase IBGT occurs straight-through in the IPM, then short circuit occurs for phase IGBT；Alternatively, an if phase in the IPM
Phase shortage occurs for the current signal of IBGT, then open circuit occurs for phase IGBT.
Optionally, wherein determine the current signal whether be more than the IPM current threshold, comprising: by setting exist
Current detecting unit in the IPM between controller and IGBT unit, to the current signal whether be more than the IPM electricity
Stream threshold value is determined；And/or control the IPM and stop working, comprising: by the controller in the MCU, described in closing
PWM drive signal exports in IPM.
Match with the above method, another aspect of the present invention provides the protective device of IPM a kind of, comprising: acquiring unit is used
In the current signal for obtaining the IPM；Control unit, for determining that the IGBT inside the IPM is according to the current signal
No exception, and/or, determine the current signal whether be more than the IPM current threshold；Described control unit, if being also used to
There are the IGBT, and abnormal, the described current signal is more than at least one of current threshold failure situations, then described in control
IPM stops working.
Optionally, the acquiring unit obtains the current signal of the IPM, comprising: the IPM not running the case where
Under, the current signal that IGBT is flowed through in the IPM is obtained by way of to the IPM injecting voltage；Alternatively, in the IPM
In the case where operation, the current signal that IGBT is flowed through in the IPM is obtained.
Optionally, wherein the acquiring unit obtains in the IPM by way of to the IPM injecting voltage to be flowed through
The current signal of IGBT, comprising: in such a way that the PWM drive signal to the IPM is adjusted, to each in the IPM
After phase IGBT injection setting voltage, the current signal that phase IGBT is flowed through in the IPM is detected；Alternatively, the acquiring unit exists
In the case where the IPM operation, the current signal that IGBT is flowed through in the IPM is obtained, comprising: the case where the IPM is run
Under, detect the current signal that each phase IGBT is flowed through in the IPM.
Optionally, described control unit determines whether the IGBT inside the IPM is abnormal according to the current signal, packet
Include: if the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exists abnormal.
Optionally, if the current signal of three-phase IGBT is asymmetric in the described control unit IPM, the IGBT exists
It is abnormal, comprising: if straight-through, phase IGBT generation short circuit occurs for the current signal of a phase IBGT in the IPM；Alternatively, if institute
Phase shortage occurs for the current signal for stating a phase IBGT in IPM, then open circuit occurs for phase IGBT.
Optionally, wherein described control unit determine the current signal whether be more than the IPM current threshold, packet
It includes: by the way that the current detecting unit in the IPM between controller and IGBT unit is arranged in, whether the current signal being surpassed
The current threshold for crossing the IPM is determined；And/or described control unit controls the IPM and stops working, comprising: passes through institute
The controller in MCU is stated, PWM drive signal in the IPM is closed and exports.
Match with above-mentioned apparatus, further aspect of the present invention provides a kind of IPM module, comprising: the guarantor of above-described IPM
Protection unit.
Match with the above method, further aspect of the present invention provides a kind of storage medium, comprising: deposited in the storage medium
Contain a plurality of instruction；The a plurality of instruction, for being loaded by processor and being executed the guard method of above-described IPM.
Match with the above method, further aspect of the present invention provides a kind of IPM module, comprising: processor is more for executing
Item instruction；Memory, for storing a plurality of instruction；Wherein, a plurality of instruction, for being stored by the memory, and by institute
State the guard method that processor loads and executes above-described IPM.
The solution of the present invention, by carrying out effective detection in real time to IPM module failure, as long as IPM ontological existence is abnormal
With regard to being protected in time, operation troubles rate can be reduced.
Further, the solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM injecting voltage, while to electric current
Signal is detected, and determines that whether IGBT is normal inside IPM, realizes to IPM by the judgement to the current signal value detected
Module failure carries out effective detection in real time, can reduce operation troubles rate, promote operational reliability.
Further, the solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM injecting voltage, while to electric current
Signal is detected, and determines that whether IGBT is normal inside IPM, realizes to IPM by the judgement to the current signal value detected
Module failure carries out effective detection in real time, can reduce maintenance difficulties and maintenance cost.
Further, the solution of the present invention, by increasing current protection simultaneously on hardware, when electric current is more than the maximum of IPM
When allowable current, timely stop IPM work, it is abnormal caused by electric current can be prevented excessive, improve operational reliability.
Further, the solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM injecting voltage, while to electric current
Signal is detected, and determines that whether IGBT is normal inside IPM, realizes to IPM by the judgement to the current signal value detected
Module failure carries out effective detection in real time；Increase current protection simultaneously on hardware, when electric current is more than the maximum allowable electricity of IPM
When stream, timely stops IPM work, can preferably promote operational reliability and safety, reduce operation troubles rate.
The solution of the present invention as a result, is believed by the adjusting of the driving PWM to IPM to IPM injecting voltage, while to electric current
It number is detected, determines that whether IGBT is normal inside IPM, realizes to IPM mould by the judgement to the current signal value detected
Block failure carries out effective detection in real time, is protected in time as long as IPM ontological existence is abnormal, solution in the prior art can not
The defect situation for identifying IPM module, leads to IPM module high problem of operation troubles rate in defective situation, thus, overcome
The defect that operation troubles rate is high, maintenance difficulties are big and at high cost in the prior art, realize that operation troubles rate is low, maintenance difficulties are small and
Beneficial effect at low cost.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the flow diagram of an embodiment of the guard method of IPM of the invention；
Fig. 2 is the structural schematic diagram of an embodiment of the protective device of IPM of the invention；
Fig. 3 is the structural schematic diagram of the basic circuit of the inverter control circuit of an embodiment of IPM module of the invention；
Fig. 4 is that the G1 open circuit detection driving of an embodiment of IPM module of the invention and the structure in signal detection circuit are shown
It is intended to；
Fig. 5 is the three-phase current waveform diagram of an embodiment of IPM module of the invention, wherein figure (a) is 6 tunnels
Current waveform schematic diagram when IGBT is normal, current waveform schematic diagram when figure (b) is the G1 open circuit of IGBT bridge；
The structural schematic diagram of detection circuit when Fig. 6 is the IGBT bridge G1 short circuit of an embodiment of IPM module of the invention.
In conjunction with attached drawing, appended drawing reference is as follows in the embodiment of the present invention:
102- acquiring unit；104- control unit.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
According to an embodiment of the invention, the guard method of IPM a kind of is provided, the one of method of the invention as shown in Figure 1
The flow diagram of embodiment.The guard method of the IPM may include: step S110 to step S130.
At step S110, the current signal of the IPM is obtained.
Optionally, the current signal that the IPM is obtained in step S110 may include following any acquisition situation.
The first obtains situation: in the case where the IPM not running, obtaining by way of to the IPM injecting voltage
Take the current signal that IGBT is flowed through in the IPM.
More optionally, the current signal that IGBT is flowed through in the IPM is obtained by way of to the IPM injecting voltage,
It may include: to be set in such a way that the PWM drive signal to the IPM is adjusted to phase IGBT each in IPM injection
After constant voltage, the current signal that phase IGBT is flowed through in the IPM is detected.
Such as: when IPM does not work, by inputting certain voltage to each phase IGBT, while detection flows through IGBT's
Electric current, to determine whether IGBT has exception.
As a result, by the case where IPM not running by phase IGBT each in IPM inject setting voltage after detection stream
The current signal for crossing phase IGBT may be implemented the fault detection in IPM not running to IPM, improve fault detection
Convenience and reliability.
Second of acquisition situation: in the case where IPM operation, the current signal that IGBT is flowed through in the IPM is obtained.
Such as: before IPM operation or in operation, by the adjusting of the driving PWM to IPM, to IPM injecting voltage, together
When current signal is detected, determine whether IGBT normal inside IPM by the judgement to the current signal value detected.
The current signal of IGBT is flowed through in IPM to realize by obtaining respectively under IPM not running or operating condition as a result,
Protection to IPM, so that the protected mode to IPM is flexibly and reliable.
More optionally, in the case where the IPM is run, the current signal for flowing through IGBT in the IPM is obtained, can wrap
It includes: in the case where IPM operation, detecting the current signal for flowing through each phase IGBT in the IPM.
Such as: in IPM operation, the electric current of every IBGT is flowed through by detecting, three-phase current is symmetrical when normal, if its
In IGBT exist abnormal, then three-phase current is no longer symmetrical, if short circuit occurs for one of IBGT, corresponding one meets
Occur to lead directly to, if the phenomenon that open circuit occurs for one of IGBT, and corresponding phase current will appear phase shortage, by each phase electricity
The judgement of stream, to judge whether IPM is faulty.
The current signal for flowing through each phase IGBT by detecting in the case where IPM is run as a result, may be implemented in IPM
Protection under fault detection and then realization IPM operating condition under operating condition to IPM, so that the protection to IPM is relatively reliable
And safety.
At step S120, determine whether the IGBT inside the IPM is abnormal according to the current signal, and/or, it determines
The current signal whether be more than the IPM current threshold.
Optionally, determine whether the IGBT inside the IPM is abnormal, can wrap according to the current signal in step S120
Include: if the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exists abnormal.
As a result, by determined when the current signal asymmetry of three-phase IGBT in IPM IGBT exception so as to IGBT whether
Abnormal detection timeliness is good, high reliablity.
More optionally, if the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exist it is abnormal, can be with
Including following any failure situations.
The first failure situations: if the current signal of a phase IBGT occurs to lead directly in the IPM, phase IGBT occurs short
Road.
Such as: if short trouble occurs for the one of IGBT of IPM, occur in another module of same bridge arm short
Lu Shi occurs as soon as " straight-through " phenomenon, then flow through the electric current of IGBT much larger than it is normal when electric current, pass through current signal extract it is single
Enter protection location after member, filtering amplifier unit, since current value at this time is much larger than normal value, trigger current protects signal,
MCU detects that cutting off PWM output at once after protection signal prevents IGBT since overcurrent is burnt out, when electric current occurs straight-through due to electricity
Stream amplitude is big, and operating time of protection is fast, and whole event is shorter, and MCU is acquired current signal come not anxious, can only pass through hardware
Mode protected.It is illustrated for G1, if short circuit occurs in operation, trigger current can protect immediately,
At this time since 6 road IGBT may work, the IGBT of specific short circuit can not be directly judged；Before IPM puts into operation, if
Judge whether G1 has short trouble, need to give PMW2 effective driving signal at this time, if G1 is short-circuit, G1, G2 occur straight
Logical, horse back trigger protection will not be led directly to if G1 not short circuit, and entire circuit no current flows through, will not trigger current guarantor
Shield, physical circuit are as shown in Figure 6.
Similarly, can also judge by the same method when short circuit occurs for G2, G3, G4, G5, G6, it is to be detected
The relationship of IGBT and input PWM are as shown in the table.
| IGBT to be detected | G1 | G3 | G5 | G2 | G4 | G6 |
| Input PWM | PWM2 | PWM4 | PWM6 | PWM1 | PWM3 | PWM5 |
Second of failure situations: if phase shortage occurs for the current signal of a phase IBGT in the IPM, phase IGBT occurs disconnected
Road.
Such as: when current signal extraction unit has electric current to flow through, just has current signal and enter filtering amplifier unit, warp
MCU is sent into after overprotection unit, MCU is assured that the size of current value after converting to the electric current of input.Work as G1
When open circuit fault occurs, electric current is not had and is flowed through, the current signal detected at this time is zero；When breaking event occurs simultaneously for G4 and G6
When barrier, does not have electric current equally and flow through, the current signal detected at this time is zero；If one of them is normal by G4 and G6, electric current
It can still circulate, the current signal detected at this time is not zero；It similarly, can be according to identical for other IGBT bridge arms
Method is detected, and IGBT detection is as shown in the table with the corresponding relationship of PWM:
After IPM puts into operation, the 6 tunnel driving signal PWM1-PWM6 of IPM are sequentially output useful signal according to modulating rule,
Corresponding Iu、Iv、IwThree-phase current is equal in amplitude within an electric period, successively postpones 2 π/3 in phase.If therein
Open circuit occurs for one phase bridge, then the amplitude of three-phase current is then no longer equal, also just without the delay of 2 π/3 in phase.It is corresponding when normal
Shown in current waveform such as Fig. 5 (a), current waveform when IGBT bridge G1 breaks down closely attempts shown in 5 (b), as seen from Figure 5,
When normal, iu、iv、iwCover area of substantially equal, positive and negative half axial symmetry of the three-phase current in 2 π inner curve of a cycle；Work as G1
When breaking down, iuPositive axis electric current is zero, only minus half shaft current, and curve covers area relative to it in one cycle
Its two-phase is obviously reduced, therefore can judge whether that phase shortage, calculation formula occurs to the envelope size of three-phase current by detection
It is as follows:
In formula, ixFor the instantaneous value of electric current, x represents u, v, w three-phase phase current, SixFor the product of phase current in one cycle
Point.It may refer to example shown in fig. 5.
Its specific failure situations is determined according to the asymmetric specific situation of the current signal of three-phase IGBT as a result, so that right
The judgement of specific failure situations is more accurate and reliable, is conducive to the convenience and high efficiency that promote maintenance.
Optionally, determined in step S120 the current signal whether be more than the IPM current threshold, may include:
By the way that the current detecting unit (protection location of such as Fig. 3) in the IPM between controller and IGBT unit is arranged in, to described
Whether current signal is more than that the current threshold of the IPM is determined.
Current signal is realized by the way that the current detecting unit in IPM between controller and IGBT unit is arranged in as a result,
Detection, detection mode is easy and accuracy is good.
At step S130, the IGBT is abnormal if it exists, the current signal be more than in the current threshold at least
A kind of failure situations then control the IPM and stop working, to realize the protection to the IPM.
Such as: it can determine that IPM is thrown according to the state of IGBT all inside IPM to the state real-time judge of the inside IPM IGBT
Enter operation or stopping；It is timely as long as IPM ontological existence is abnormal by carrying out effective detection in real time to IPM module failure
Protected, can solve IPM module can not identify in defective situation, run under defect situation may cause it is different
Chang Wenti.
Such as: to prevent electric current excessive caused abnormal, increase current protection simultaneously on hardware, when electric current is more than IPM
Maximum permissible current when, timely stop IPM work.
Determining it by the current signal according to IPM as a result, whether internal IGBT is abnormal, determines whether the current signal surpasses
The current threshold of setting is crossed, and then is controlled in the case where IGBT exception, current signal are more than at least one of current threshold fault condition
IPM stops working, and realizes the protection to IPM, has not only conveniently realized fault detection, be also reliably achieved protection, favorably
In reducing operation troubles rate and device failure rate, the safety of reliability of operation and device ensure that.
Optionally, the IPM is controlled in step S130 to stop working, may include: by the controller in the MCU,
PWM drive signal in the IPM is closed to export.
Such as: protection location carries out amplitude judgement to current signal, will trigger protection letter when current value overruns
Number, PWM output is closed by MCU internal hardware circuit.
The control in such a way that MCU controller closes PWM driving unit to the PWM drive signal output of IGBT unit as a result,
IPM processed stops working, and high reliablity, safety are good.
It is effective in real time by being carried out to IPM module failure using the technical solution of the present embodiment through a large amount of verification experimental verification
Detection, protected in time as long as IPM ontological existence is abnormal, operation troubles rate can be reduced.
According to an embodiment of the invention, additionally providing the protective device of IPM of the guard method corresponding to IPM a kind of.Ginseng
The structural schematic diagram of an embodiment of the device of the invention as shown in Figure 2.The protective device of the IPM may include: acquiring unit
102 and control unit 104.
In an optional example, acquiring unit 102 can be used for obtaining the current signal of the IPM.The acquiring unit
102 concrete function and processing are referring to step S110.
Optionally, the acquiring unit 102 obtains the current signal of the IPM, may include following any acquisition feelings
Shape.
The first obtains situation: the acquiring unit 102 specifically can be also used in the case where the IPM not running,
The current signal that IGBT is flowed through in the IPM is obtained by way of to the IPM injecting voltage.
More optionally, the acquiring unit 102 is obtained in the IPM by way of to the IPM injecting voltage and is flowed through
The current signal of IGBT may include: the acquiring unit 102, specifically can be also used for through the PWM driving to the IPM
The mode that signal is adjusted detects after injecting setting voltage to phase IGBT each in the IPM and flows through the phase in the IPM
The current signal of IGBT.
Such as: when IPM does not work, by inputting certain voltage to each phase IGBT, while detection flows through IGBT's
Electric current, to determine whether IGBT has exception.
As a result, by the case where IPM not running by phase IGBT each in IPM inject setting voltage after detection stream
The current signal for crossing phase IGBT may be implemented the fault detection in IPM not running to IPM, improve fault detection
Convenience and reliability.
Second of acquisition situation: the acquiring unit 102 specifically can be also used for obtaining in the case where the IPM is run
Take the current signal that IGBT is flowed through in the IPM.
Such as: before IPM operation or in operation, by the adjusting of the driving PWM to IPM, to IPM injecting voltage, together
When current signal is detected, determine whether IGBT normal inside IPM by the judgement to the current signal value detected.
The current signal of IGBT is flowed through in IPM to realize by obtaining respectively under IPM not running or operating condition as a result,
Protection to IPM, so that the protected mode to IPM is flexibly and reliable.
More optionally, the acquiring unit 102 obtains in the IPM in the case where the IPM is run and flows through IGBT's
Current signal may include: the acquiring unit 102, specifically can be also used for detecting institute in the case where the IPM is run
State the current signal that each phase IGBT is flowed through in IPM.
Such as: in IPM operation, the electric current of every IBGT is flowed through by detecting, three-phase current is symmetrical when normal, if its
In IGBT exist abnormal, then three-phase current is no longer symmetrical, if short circuit occurs for one of IBGT, corresponding one meets
Occur to lead directly to, if the phenomenon that open circuit occurs for one of IGBT, and corresponding phase current will appear phase shortage, by each phase electricity
The judgement of stream, to judge whether IPM is faulty.
The current signal for flowing through each phase IGBT by detecting in the case where IPM is run as a result, may be implemented in IPM
Protection under fault detection and then realization IPM operating condition under operating condition to IPM, so that the protection to IPM is relatively reliable
And safety.
In an optional example, control unit 104 can be used for being determined inside the IPM according to the current signal
IGBT it is whether abnormal, and/or, determine the current signal whether be more than the IPM current threshold.The control unit 104
Concrete function and processing referring to step S120.
Optionally, described control unit 104 determines whether the IGBT inside the IPM is abnormal according to the current signal,
It may include: described control unit 104, if the current signal that specifically can be also used for three-phase IGBT in the IPM is asymmetric,
The IGBT exists abnormal.
More optionally, described if the current signal of three-phase IGBT is asymmetric in the IPM of described control unit 104
There is exception in IGBT, may include following any failure situations.
The first failure situations: described control unit 104, if specifically can be also used for the electricity of a phase IBGT in the IPM
It flows signal and straight-through, then phase IGBT generation short circuit occurs.
Such as: if short trouble occurs for the one of IGBT of IPM, occur in another IGBT of same bridge arm short
Lu Shi occurs as soon as " straight-through " phenomenon, then flow through the electric current of IGBT much larger than it is normal when electric current, pass through current signal extract it is single
Enter protection location after member, filtering amplifier unit, since current value at this time is much larger than normal value, trigger current protects signal,
MCU detects that cutting off PWM output at once after protection signal prevents IGBT since overcurrent is burnt out, when electric current occurs straight-through due to electricity
Stream amplitude is big, and operating time of protection is fast, and whole event is shorter, and MCU is acquired current signal come not anxious, can only pass through hardware
Mode protected.It is illustrated for G1, if short circuit occurs in operation, trigger current can protect immediately,
At this time since 6 road IGBT may work, the IGBT of specific short circuit can not be directly judged；Before IPM puts into operation, if
Judge whether G1 has short trouble, need to give PMW2 effective driving signal at this time, if G1 is short-circuit, G1, G2 occur straight
Logical, horse back trigger protection will not be led directly to if G1 not short circuit, and entire circuit no current flows through, will not trigger current guarantor
Shield, physical circuit are as shown in Figure 6.
Similarly, can also judge by the same method when short circuit occurs for G2, G3, G4, G5, G6, it is to be detected
The relationship of IGBT and input PWM are as shown in the table.
| IGBT to be detected | G1 | G3 | G5 | G2 | G4 | G6 |
| Input PWM | PWM2 | PWM4 | PWM6 | PWM1 | PWM3 | PWM5 |
Second of failure situations: described control unit 104, if specifically can be also used for the electricity of a phase IBGT in the IPM
It flows signal and phase shortage occurs, then open circuit occurs for phase IGBT.
Such as: when current signal extraction unit has electric current to flow through, just has current signal and enter filtering amplifier unit, warp
MCU is sent into after overprotection unit, MCU is assured that the size of current value after converting to the electric current of input.Work as G1
When open circuit fault occurs, electric current is not had and is flowed through, the current signal detected at this time is zero；When breaking event occurs simultaneously for G4 and G6
When barrier, does not have electric current equally and flow through, the current signal detected at this time is zero；If one of them is normal by G4 and G6, electric current
It can still circulate, the current signal detected at this time is not zero；It similarly, can be according to identical for other IGBT bridge arms
Method is detected, and IGBT detection is as shown in the table with the corresponding relationship of PWM:
After IPM puts into operation, the 6 tunnel driving signal PWM1-PWM6 of IPM are sequentially output useful signal according to modulating rule,
Corresponding Iu、Iv、IwThree-phase current is equal in amplitude within an electric period, successively postpones 2 π/3 in phase.If therein
Open circuit occurs for one phase bridge, then the amplitude of three-phase current is then no longer equal, also just without the delay of 2 π/3 in phase.It is corresponding when normal
Shown in current waveform such as Fig. 5 (a), current waveform when IGBT bridge G1 breaks down closely attempts shown in 5 (b), as seen from Figure 5,
When normal, iu、iv、iwCover area of substantially equal, positive and negative half axial symmetry of the three-phase current in 2 π inner curve of a cycle；Work as G1
When breaking down, iu positive axis electric current is zero, only minus half shaft current, and curve covers area relative to it in one cycle
Its two-phase is obviously reduced, therefore can judge whether that phase shortage, calculation formula occurs to the envelope size of three-phase current by detection
It is as follows:
In formula, ixFor the instantaneous value of electric current, x represents u, v, w three-phase phase current, SixFor the product of phase current in one cycle
Point.It may refer to example shown in fig. 5.
Its specific failure situations is determined according to the asymmetric specific situation of the current signal of three-phase IGBT as a result, so that right
The judgement of specific failure situations is more accurate and reliable, is conducive to the convenience and high efficiency that promote maintenance.
Optionally, described control unit 104 determine the current signal whether be more than the IPM current threshold, can be with
Include: described control unit 104, specifically can be also used for by being arranged in the IPM between controller and IGBT unit
Whether current detecting unit 104 is more than that the current threshold of the IPM is determined to the current signal.
The inspection of current signal is realized by the current detecting unit being arranged between IPM, controller and IGBT unit as a result,
It surveys, detection mode is easy and accuracy is good.
In an optional example, described control unit 104 can be also used for the IGBT exception, the electricity if it exists
Flowing signal is more than at least one of current threshold failure situations, then controls the IPM and stop working, to realize to described
The protection of IPM.The concrete function of the control unit 104 and processing see also step S130.
Such as: it can determine that IPM is thrown according to the state of IGBT all inside IPM to the state real-time judge of the inside IPM IGBT
Enter operation or stopping；It is timely as long as IPM ontological existence is abnormal by carrying out effective detection in real time to IPM module failure
Protected, can solve IPM module can not identify in defective situation, run under defect situation may cause it is different
Chang Wenti.
Such as: to prevent electric current excessive caused abnormal, increase current protection simultaneously on hardware, when electric current is more than IPM
Maximum permissible current when, timely stop IPM work.
Determining it by the current signal according to IPM as a result, whether internal IGBT is abnormal, determines whether the current signal surpasses
The current threshold of setting is crossed, and then is controlled in the case where IGBT exception, current signal are more than at least one of current threshold fault condition
IPM stops working, and realizes the protection to IPM, has not only conveniently realized fault detection, be also reliably achieved protection, favorably
In reducing operation troubles rate and device failure rate, the safety of reliability of operation and device ensure that.
Optionally, described control unit 104 controls the IPM and stops working, and may include: described control unit 104, tool
Body can be also used for closing PWM drive signal in the IPM by the controller in the MCU and exporting.
Such as: protection location carries out amplitude judgement to current signal, will trigger protection letter when current value overruns
Number, PWM output is closed by MCU internal hardware circuit.
The side of PWM drive signal output of the PWM driving unit to IGBT unit is closed by the controller in MCU as a result,
Formula control IPM stops working, and high reliablity, safety are good.
The processing and function realized by the device of the present embodiment essentially correspond to the implementation of aforementioned method shown in FIG. 1
Example, principle and example, therefore not detailed place in the description of the present embodiment, may refer to the related description in previous embodiment,
This is not repeated them here.
Through a large amount of verification experimental verification, using technical solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM
Injecting voltage, while current signal is detected, IGBT inside IPM is determined by the judgement to the current signal value detected
It is whether normal, realize and effective detection in real time carried out to IPM module failure, can reduce operation troubles rate, promoted it is reliable for operation
Property.
According to an embodiment of the invention, additionally providing a kind of IPM module of the protective device corresponding to IPM.The IPM module
It may include: the protective device of above-described IPM.
In an optional embodiment, the solution of the present invention proposes a kind of effective IGBT failure detection schemes, can
To the state real-time judge of the inside IPM IGBT, puts into operation or stop according to the state decision IPM of IGBT all inside IPM；
It is thus possible to which solving IPM module can not identify in defective situation, the exception that running under defect situation may cause is asked
Topic.In this way, being protected in time as long as IPM ontological existence is abnormal by carrying out effective detection in real time to IPM module failure
Shield.
In an optional example, the solution of the present invention passes through the driving to IPM before IPM operation or in operation
The adjusting of PWM is detected to IPM injecting voltage, while to current signal, passes through the judgement to the current signal value detected
Determine whether IGBT is normal inside IPM；Be it is abnormal caused by preventing electric current excessive, increase current protection simultaneously on hardware, when
When electric current is more than the maximum permissible current of IPM, timely stop IPM work.
Specifically, when IPM does not work, by inputting certain voltage to each phase IGBT, while IGBT is flowed through in detection
Electric current, to determine whether IGBT has exception；In IPM operation, the electric current of every IBGT, three-phase when normal are flowed through by detecting
Current-symmetrical, if one of IGBT has exception, three-phase current is no longer symmetrical, if one of IBGT generation is short
Road then corresponding one is met and is led directly to, if open circuit occurs for one of IGBT, corresponding phase current will appear showing for phase shortage
As by the judgement to each phase current, to judge whether IPM is faulty.To prevent electric current excessive caused abnormal, in hardware
Above while increasing current protection, when electric current is more than the maximum permissible current of IPM, timely stops IPM work.
In an optional specific embodiment, Fig. 3 may refer to example shown in fig. 6, to the solution of the present invention
Specific implementation process illustrates.
The topological circuit of IPM inversion is as shown in Figure 3.Fig. 3 is the basic circuit of inverter control circuit, may include: IPM inverse
Become road and driving, signal acquisition unit again.The solution of the present invention is on the basis of borrowing existing hardware circuit topology, by controlling
Adjustment on system strategy, completes the fault self-checking of IPM.
In Fig. 3, G1, G2, G3, G4, G5, G6 are 6 IGBT bridges inside corresponding IPM, the inversion for high voltage power supply
Modulation.PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 are corresponding 6 tunnel driving signal, the driving signal of IGBT.Current signal
Extraction unit or current signal detection circuit, current signal when for bridge arm inside IPM to be connected are converted to signal, commonly
Method has the conversion regime of current transformer, cement resistor, current Hall device.Filter amplifier unit: for current signal
It is filtered and amplifies, to meet the requirement of MCU and protective current.Protection location carries out amplitude judgement to current signal, works as electricity
Flow valuve when overruning will trigger protection signal, pass through MCU internal hardware circuit and close PWM output.MCU is main control unit,
It is mainly responsible for the acquisition of current signal and the output of pwm signal, usually dsp chip.M is motor, usually permanent magnet synchronous electric
Machine or induction machine.
In an optional specific example, the failure of IGBT bridge is divided into open circuit fault and short trouble inside IPM, divides below
It is not illustrated.
Optionally, the detection mode of open circuit fault, can be such that
It is illustrated, is divided into after putting into operation before IPM is run with IPM, concrete analysis is as shown in Figure 4 for G1.
Before IPM operation, effective driving signal is provided to PWM1, PWM4, PWM6 respectively, IGBT unit G1 inside IPM,
G4, G6 will be connected, at this time current signal by VDC+ by G1, into a wherein phase winding for motor, by other two-phases around
Enter G4, G6 after group, VDC- is then flow back into after overcurrent signal extraction unit, is formed into a loop.
When current signal extraction unit has electric current to flow through, just has current signal and enter filtering amplifier unit, by protecting
It is sent into MCU after shield unit, MCU is assured that the size of current value after converting to the electric current of input.When G1 occurs
When open circuit fault, electric current is not had and is flowed through, the current signal detected at this time is zero；When open circuit fault occurs simultaneously for G4 and G6
When, it does not have electric current equally and flows through, the current signal detected at this time is zero；If one of them is normal by G4 and G6, electric current is still
Old to circulate, the current signal detected at this time is not zero；It similarly, can be according to identical side for other IGBT bridge arms
Method is detected, and IGBT detection is as shown in the table with the corresponding relationship of PWM:
After IPM puts into operation, the 6 tunnel driving signal PWM1-PWM6 of IPM are sequentially output useful signal according to modulating rule,
Corresponding Iu、Iv、IwThree-phase current is equal in amplitude within an electric period, successively postpones 2 π/3 in phase.If therein
Open circuit occurs for one phase bridge, then the amplitude of three-phase current is then no longer equal, also just without the delay of 2 π/3 in phase.It is corresponding when normal
Shown in current waveform such as Fig. 5 (a), current waveform when IGBT bridge G1 breaks down closely attempts shown in 5 (b), as seen from Figure 5,
When normal, iu、iv、iwCover area of substantially equal, positive and negative half axial symmetry of the three-phase current in 2 π inner curve of a cycle；Work as G1
When breaking down, iuPositive axis electric current is zero, only minus half shaft current, and curve covers area relative to it in one cycle
Its two-phase is obviously reduced, therefore can judge whether that phase shortage, calculation formula occurs to the envelope size of three-phase current by detection
It is as follows:
In formula, ixFor the instantaneous value of electric current, x represents u, v, w three-phase phase current, SixFor the product of phase current in one cycle
Point.It may refer to example shown in fig. 5.
Optionally, the detection mode of short trouble can be such that
If short trouble occurs for the one of IGBT of IPM, when short circuit occurs for another module of same bridge arm,
Occur as soon as " straight-through " phenomenon, then flow through the electric current of IGBT much larger than it is normal when electric current, pass through current signal extraction unit, filter
Enter protection location after wave amplifier unit, since current value at this time is much larger than normal value, trigger current protects signal, MCU inspection
It measures and cuts off PWM output at once after protection signal and prevent IGBT since overcurrent is burnt out, when electric current occurs straight-through due to electric current width
Value is big, and operating time of protection is fast, and whole event is shorter, and MCU is acquired current signal come not anxious, can only pass through the side of hardware
Formula is protected.
Be illustrated for G1, if in operation occur short circuit, can immediately trigger current protect, at this time due to
6 road IGBT may work, and can not directly judge the IGBT of specific short circuit；Before IPM puts into operation, if to judge G1
Whether there is short trouble, need to give PMW2 effective driving signal at this time, if G1 is short-circuit, straight-through, touching at once occurs for G1, G2
Hair protection will not be led directly to if G1 not short circuit, and entire circuit no current flows through, will not trigger current protection, specific electricity
Road is as shown in Figure 6.
Similarly, can also judge by the same method when short circuit occurs for G2, G3, G4, G5, G6, it is to be detected
The relationship of IGBT and input PWM are as shown in the table.
| IGBT to be detected | G1 | G3 | G5 | G2 | G4 | G6 |
| Input PWM | PWM2 | PWM4 | PWM6 | PWM1 | PWM3 | PWM5 |
The processing and function realized by the IPM module of the present embodiment essentially correspond to aforementioned device shown in Fig. 2
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment, may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, using technical solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM
Injecting voltage, while current signal is detected, IGBT inside IPM is determined by the judgement to the current signal value detected
It is whether normal, it realizes and effective detection in real time is carried out to IPM module failure, maintenance difficulties and maintenance cost can be reduced.
According to an embodiment of the invention, additionally providing a kind of storage medium of the guard method corresponding to IPM.The storage is situated between
Matter may include: that a plurality of instruction is stored in the storage medium；The a plurality of instruction, for being loaded by processor and being executed
The guard method of above-described IPM.
The processing and function realized by the storage medium of the present embodiment essentially correspond to aforementioned method shown in FIG. 1
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment, may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, using technical solution of the present invention, by increasing current protection simultaneously on hardware, when
When electric current is more than the maximum permissible current of IPM, timely stop IPM work, it is abnormal caused by electric current can be prevented excessive, it is promoted
Operational reliability.
According to an embodiment of the invention, additionally providing a kind of IPM module of the guard method corresponding to IPM.The IPM mould
Block may include: processor, for executing a plurality of instruction；Memory, for storing a plurality of instruction；Wherein, a plurality of finger
It enables, for being stored by the memory, and is loaded by the processor and executed the guard method of above-described IPM.
The processing and function realized by the IPM module of the present embodiment essentially correspond to aforementioned method shown in FIG. 1
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment, may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, using technical solution of the present invention, by the adjusting of the driving PWM to IPM, to IPM
Injecting voltage, while current signal is detected, IGBT inside IPM is determined by the judgement to the current signal value detected
It is whether normal, it realizes and effective detection in real time is carried out to IPM module failure；Increase current protection simultaneously on hardware, works as electric current
When maximum permissible current more than IPM, timely stops IPM work, can preferably promote operational reliability and safety, drop
Low operation troubles rate.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only an embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within scope of the presently claimed invention.
Claims (15)
1. a kind of guard method of IPM characterized by comprising
Obtain the current signal of the IPM；
Determine whether the IGBT inside the IPM is abnormal according to the current signal, and/or, whether determine the current signal
More than the current threshold of the IPM；
The IGBT exception, the current signal are more than at least one of current threshold failure situations if it exists, then control
The IPM is made to stop working.
2. the method according to claim 1, wherein obtaining the current signal of the IPM, comprising:
In the case where the IPM not running, is obtained in the IPM by way of to the IPM injecting voltage and flow through IGBT
Current signal；
Alternatively,
In the case where IPM operation, the current signal that IGBT is flowed through in the IPM is obtained.
3. according to the method described in claim 2, it is characterized in that, wherein,
The current signal that IGBT is flowed through in the IPM is obtained by way of to the IPM injecting voltage, comprising:
In such a way that the PWM drive signal to the IPM is adjusted, setting electricity is injected to phase IGBT each in the IPM
After pressure, the current signal that phase IGBT is flowed through in the IPM is detected；
Alternatively,
In the case where IPM operation, the current signal that IGBT is flowed through in the IPM is obtained, comprising:
In the case where IPM operation, the current signal that each phase IGBT is flowed through in the IPM is detected.
4. method described in one of -3 according to claim 1, which is characterized in that determined in the IPM according to the current signal
Whether the IGBT in portion is abnormal, comprising:
If the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exists abnormal.
5. according to the method described in claim 4, it is characterized in that, if the current signal of three-phase IGBT is asymmetric in the IPM,
Then the IGBT exists abnormal, comprising:
If the current signal of a phase IBGT occurs straight-through in the IPM, short circuit occurs for phase IGBT；Alternatively,
If phase shortage occurs for the current signal of a phase IBGT in the IPM, open circuit occurs for phase IGBT.
6. method described in one of -5 according to claim 1, which is characterized in that wherein,
Determine the current signal whether be more than the IPM current threshold, comprising:
By the way that the current detecting unit in the IPM between controller and IGBT unit is arranged in, to the current signal whether
Current threshold more than the IPM is determined；
And/or
The IPM is controlled to stop working, comprising:
By the controller in the MCU, closes PWM drive signal in the IPM and export.
7. a kind of protective device of IPM characterized by comprising
Acquiring unit, for obtaining the current signal of the IPM；
Control unit, for determining whether IGBT inside the IPM abnormal according to the current signal, and/or, determine described in
Current signal whether be more than the IPM current threshold；
Described control unit, be also used to the IGBT if it exists is abnormal, the current signal be more than in the current threshold extremely
A kind of few failure situations, then control the IPM and stop working.
8. device according to claim 7, which is characterized in that the acquiring unit obtains the current signal of the IPM, packet
It includes:
In the case where the IPM not running, is obtained in the IPM by way of to the IPM injecting voltage and flow through IGBT
Current signal；
Alternatively,
In the case where IPM operation, the current signal that IGBT is flowed through in the IPM is obtained.
9. device according to claim 8, which is characterized in that wherein,
The acquiring unit obtains the current signal that IGBT is flowed through in the IPM by way of to the IPM injecting voltage, packet
It includes:
In such a way that the PWM drive signal to the IPM is adjusted, setting electricity is injected to phase IGBT each in the IPM
After pressure, the current signal that phase IGBT is flowed through in the IPM is detected；
Alternatively,
The acquiring unit obtains the current signal that IGBT is flowed through in the IPM in the case where the IPM is run, comprising:
In the case where IPM operation, the current signal that each phase IGBT is flowed through in the IPM is detected.
10. the device according to one of claim 7-9, which is characterized in that described control unit is according to the current signal
Determine whether the IGBT inside the IPM is abnormal, comprising:
If the current signal of three-phase IGBT is asymmetric in the IPM, the IGBT exists abnormal.
11. device according to claim 10, which is characterized in that if three-phase IGBT in the described control unit IPM
Current signal is asymmetric, then the IGBT exists abnormal, comprising:
If the current signal of a phase IBGT occurs straight-through in the IPM, short circuit occurs for phase IGBT；Alternatively,
If phase shortage occurs for the current signal of a phase IBGT in the IPM, open circuit occurs for phase IGBT.
12. the device according to one of claim 7-11, which is characterized in that wherein,
Described control unit determine the current signal whether be more than the IPM current threshold, comprising:
By the way that the current detecting unit in the IPM between controller and IGBT unit is arranged in, to the current signal whether
Current threshold more than the IPM is determined；
And/or
Described control unit controls the IPM and stops working, comprising:
By the controller in the MCU, closes PWM drive signal in the IPM and export.
13. a kind of IPM module characterized by comprising the protective device of the IPM as described in claim 7-12 is any.
14. a kind of storage medium, which is characterized in that be stored with a plurality of instruction in the storage medium；The a plurality of instruction, is used for
It is loaded by processor and executes the guard method of the IPM as described in claim 1-6 is any.
15. a kind of IPM module characterized by comprising
Processor, for executing a plurality of instruction；
Memory, for storing a plurality of instruction；
Wherein, a plurality of instruction for being stored by the memory, and is loaded by the processor and is executed such as claim
The guard method of any IPM of 1-6.
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Application publication date: 20190426 |