CN103701104B - Multiple IGBT short-circuit detectings and guard method and device - Google Patents
Multiple IGBT short-circuit detectings and guard method and device Download PDFInfo
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Abstract
The present invention discloses the method and apparatus of a kind of multiple IGBT short-circuit detectings and protection, and method and step is：1）Driving pulse is sent to each IGBT, IGBT receives driving pulse and drives IGBT open-minded；2）The magnitude of voltage at each IGBT two ends of real-time detection, judges whether more than default short-circuit voltage threshold value, if it is, being judged to IGBT inside open fault states and sending result of determination；3）To detect that the short-circuit voltage for obtaining is converted to short-circuit current value and calculates the target multiple of short-circuit voltage and short circuit current, whether judge target multiple more than default multiple threshold value, if it is, driving pulse is reduced into negative level, drive IGBT shut-offs；Device includes real-time detection IGBT failures and turn off multiple short-circuit detection protection modules of protection.Detection and protection that the present invention has the advantages that implementation method is simple, Protection parameters are consistent and can be unified to multiple IGBT, coordinated.
Description
Technical field
The present invention relates to IGBT fields, more particularly to a kind of multiple IGBT short-circuit detectings and guard method and device.
Background technology
For the detection of IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor)
Protection, mainly comprising following three kinds of methods：
(1) realized using analog discrete components, but the number of elements needed for such method is more and complicated.Especially for
For the system of multiple IGBT, due to analog device discreteness, can also there are the inconsistent situation of Protection parameters, and Protection parameters
Temperature change can produce skew over time.
(2) realize that integration module is actually also to be made up of analog discrete components, due to being packaged into mould using integration module
Block, can be with convenient use, but the program equally exists drawbacks described above, i.e., for the system of multiple IGBT, Protection parameters differ
Cause and Protection parameters temperature change can produce skew over time.
In above two scheme, when IGBT protection threshold values are used at the scene, it is impossible to be adjusted as the case may be；
When IGBT breaks down, short-circuit current value cannot precise quantification, while can not show to carry out Real Time Observation, be not easy to afterwards
Analysis.
(3) IGBT short-circuit detectings are carried out using Hall element, but there is the speed issue of protection response, nothing in such scheme
Method realizes the miniaturization of product, is seldom used in actual product.
As shown in figure 1, tradition IGBT short-circuit detection protection structural principles, using discrete analog device carry out IGBT detections and
Protection, then transmits data to central processing element.Using such scheme, required element is numerous, and each protection threshold value has partially
Difference so that protection is inaccurate；On the other hand protection threshold value is fixed while to change, while to central processing element U1
The data of transmission are limited and there is deviation, it is impossible to reflect IGBT malfunctions comprehensively.
When IGBT is applied in hyperbaric environment, such as in high voltage converter, IGBT is operated in (electricity in major loop power network
Pressure grade is from 380V to 10000V), and major loop power network is the environment of a change complexity and serious interference, using programmable core
When piece carries out direct detection and protection to IGBT, it is most likely that programmable chip can be caused to be interfered cisco unity malfunction.It is existing
Have in technology, be that will be placed on low-pressure side for the programmable chip for detecting and protecting, Phototube Coupling is carried out with major loop power network
Or Magnetic isolation, therefore IGBT short-circuit detection protections are all carried out using discrete analog device, the difference in each scheme is
Circuit structure and packing forms are otherwise varied.Cause programmable chip in major loop power network normal work, it is necessary to meet
Following two conditions：
A, guarantee programmable chip stable operating voltage.A method for meeting the condition is using HF switch electricity
Source is powered to programmable chip, and the power supply that chip fluctuates can be in time adjusted by the working frequency for adjusting Switching Power Supply；In addition
One method is to use pin to connect low-impedance capacitor in each of chip, the characteristic that can not be mutated using electric capacity both end voltage,
Suppress instantaneous interference.Capacitance size is chosen according to the voltage range that chip is allowed, if value too conference influence signal transmission
Speed, too small then unrestraint effect；
Working power voltage of the voltage no more than programmable chip on any pin of B, programmable chip.Meet this
Part only needs to be provided the voltage for determining to each pin of chip, the pin for having input and output to work can all have clear and definite voltage to believe
Number, therefore the pin that need not will be used is by pullup or pulldown resistance eutral grounding, prevents from vacantly forming indefinite voltage and breakdown.
The content of the invention
The technical problem to be solved in the present invention is that：For the technical problem that prior art is present, the present invention provides one
Kind of implementation method is simple, Protection parameters are consistent, can multiple IGBT unify detecting and protect, be easy to precise quantification and sight
Examine multiple IGBT short-circuit detectings and guard method and device of analysis.
In order to solve the above technical problems, technical scheme proposed by the present invention is：
A kind of multiple IGBT short-circuit detectings and guard method, step is：
(1) to the transmission positive level driving pulse that each IGBT is lasting, IGBT receives driving pulse and drives IGBT open-minded；
(2) magnitude of voltage at each IGBT two ends of real-time detection, judges whether more than default short-circuit voltage threshold value, if
It is to be judged to IGBT inside open faults and send result of determination, is transferred to execution step (4)；If it has not, being transferred to execution step
(3)；
(3) will detect that the short-circuit voltage for obtaining is converted to short-circuit current value and calculates the target of short-circuit voltage and short circuit current
Whether multiple, judge target multiple more than default multiple threshold value, if it is, being judged to IGBT short troubles and sending judgement
As a result, it is transferred to execution step (4)；If it has not, return performing step (2)；
(4) driving pulse is reduced to negative level, drives IGBT shut-offs.
As the further improvement of the inventive method：To detect that the short-circuit voltage for obtaining is converted in the step (3) short
The method of road current value is：The curve table of the short circuit voltage value of IGBT and short-circuit current value is divided into multiple segments, according to the following formula
The corresponding relation of each section of curve short circuit voltage value and short-circuit current value is obtained, the short circuit electricity for obtaining will be detected according to corresponding relation
Pressure is converted to short-circuit current value；
Yn=KnX(Xn≤X≤Xn+1)
Wherein, YnIt is n-th section of short-circuit current value, X is n-th section of short circuit voltage value, KnFor n-th section of short-circuit voltage with it is short
The multiple proportion of road electric current.
As the further improvement of the inventive method：The curve table of the short circuit voltage value of IGBT and short-circuit current value is divided into
10 segments.
As the further improvement of the inventive method：Also include the IGBT Damage by Short Circuit determination flows before step (1), specifically
Implementation method is：The voltage at detection IGBT two ends, determines whether less than the short-circuit voltage threshold value for setting, if it is, being judged to
IGBT Damage by Short Circuit failure simultaneously sends result of determination, and negative level driving pulse is sent to IGBT, drives IGBT shut-offs；If it has not,
Perform step (1).
A kind of multiple IGBT short-circuit detectings and protection device, including multiple short-circuit detection protection modules, each described short circuit
Detection protection module includes driver element, short-circuit detection protection unit；Each described driver element is lasting to corresponding IGBT
Sending positive level driving pulse drives IGBT open-minded, each short-circuit detection protection unit real-time detection correspondence IGBT two ends
Magnitude of voltage, judges whether more than default short-circuit voltage threshold value, if it is, being judged to IGBT inside open faults and sending sentence
Determine result, positive level driving pulse is reduced to negative level, export to driver element, drive IGBT shut-offs；If it has not, will be short-circuit electric
Whether pressure is converted to short-circuit current value and calculates the target multiple of short-circuit voltage and short circuit current, judge target multiple more than default
Multiple threshold value, if it is, being judged to IGBT short troubles and sending result of determination, positive level driving pulse is reduced to negative electricity
It is flat, export to driver element, IGBT shut-offs are driven, if it has not, continuing executing with short-circuit detection protection unit.
As the further improvement of apparatus of the present invention：The short-circuit detection protection unit includes the short-circuit voltage being sequentially connected
Collection subelement, short circuit current treatment subelement and testing result output subelement；The short-circuit voltage collection subelement collection
The voltage at IGBT two ends, exports and gives short circuit current treatment subelement, and short circuit current treatment subelement will detect obtain short
Road voltage conversion is short circuit current, calculates the target multiple of short-circuit current value and short circuit voltage value, according to default short circuit electricity
Pressure gate limit value and multiple threshold value judge the malfunction of IGBT, and subelement output short circuit current value and event are exported by testing result
Barrier state determination results.
As the further improvement of apparatus of the present invention：The short circuit current treatment subelement includes the amplification being sequentially connected
Device, ultra high speed A/D conversion chip and programmable logic chip；The programmable logic chip is short for short-circuit voltage to be converted to
Road electric current and the multiple of short circuit current and short-circuit voltage is calculated, according to default short-circuit voltage threshold value and multiple threshold value
Judge the malfunction of IGBT.
As the further improvement of apparatus of the present invention：The short circuit current treatment subelement uses programmable logic chip,
The power supply end of the programmable logic chip is connected or by the transmitting of a resistance and IGBT with the emitting stage E ends of IGBT
Level E is extremely connected.
As the further improvement of apparatus of the present invention：Also include the man-machine interaction being connected with each short-circuit detection protection module
Module, the human-computer interaction module includes parameter set unit and display touch control unit；The parameter set unit, for generating
The mapping table of each IGBT short circuit voltage value and short-circuit current value, and short-circuit voltage threshold value and multiple threshold value are set；
The display touch control unit, for receiving the malfunction result of determination of short-circuit detecting module output and being shown.
Compared with prior art, the advantage of the invention is that：
(1) present invention is by setting unified short-circuit threshold value, when IGBT short-circuit detectings are carried out, real-time detection IGBT two
Terminal voltage, the malfunction of IGBT is judged according to default short-circuit threshold value, and IGBT is turned off in time when judging and breaking down, real
Existing method is simple, it is ensured that the protection threshold value of all of IGBT is consistent, it is to avoid protection misoperation or the generation being failure to actuate；Simultaneously
Short-circuit voltage according to different IGBT carries out differentiation treatment respectively with the corresponding relation of short circuit current, the event of the IGBT to detecting
Barrier state carries out accurate classification treatment, and realization multiple IGBT short-circuit detectings are uniformly coordinated work with protection.
(2) present invention sends short circuit current and fault status information to interact after IGBT short-circuit detectings are carried out, root
Short-circuit threshold value can be configured and be changed according to IGBT real-time running states, different types of IGBT can be applied to, together
Shi Shixian is easy to Real Time Observation to analyze and process afterwards the precise quantification of short circuit current.
(3) present invention completes short-circuit detecting and defencive function, convenient use and extension using programmable logic chip, while
High pressure major loop side will be placed on for the programmable logic chip of short-circuit detection protection during for hyperbaric environment, its power supply end
It is connected with the emitting stage E ends of IGBT or is connected with the emitting stage E ends of IGBT by a resistance, without being isolated, directly enters
Row accurate detection and real-time guard, break through traditional programmable chip and can only operate in environment under low pressure, it is impossible to be operated in high compression ring
The constraint in border.
Brief description of the drawings
Fig. 1 is traditional IGBT short-circuit detection protections principle schematic diagram..
Fig. 2 is multiple IGBT short-circuit detectings and guard method schematic flow sheet in the present invention.
Fig. 3 is multiple IGBT short-circuit detectings and guard method schematic flow sheet in the specific embodiment of the invention.
Fig. 4 is the present embodiment multiple IGBT short-circuit detectings and protection device structural representation.
Fig. 5 is the present embodiment multiple IGBT short-circuit detectings and protection device interface diagram.
Fig. 6 is treatment transport module electrical block diagram in center in concrete application embodiment of the present invention.
Fig. 7 is a short-circuit detection protection modular circuit structural representation in concrete application embodiment of the present invention.
Fig. 8 is that the detection of present invention multiple IGBT short-circuit protections and protection device structural principle in concrete application embodiment show
It is intended to.
Fig. 9 is power module circuitry structural representation in concrete application embodiment of the present invention.
Figure 10 is communication module circuitry structural representation in concrete application embodiment of the present invention.
Figure 11 is human-computer interaction module interface diagram in concrete application embodiment of the present invention.
Marginal data
1st, short-circuit detection protection module；2nd, center treatment transport module；3rd, human-computer interaction module；4th, communication module；5th, electricity
Source module.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
As shown in Fig. 2 multiple IGBT short-circuit detectings of the invention and guard method, step is：
(1) to the transmission positive level driving pulse that each IGBT is lasting, IGBT receives driving pulse and drives IGBT open-minded；
(2) magnitude of voltage at each IGBT two ends of real-time detection, judges whether more than default short-circuit voltage threshold value, if
It is to be judged to IGBT inside open faults and send result of determination, is transferred to execution step (4)；If it has not, being transferred to execution step
(3)；(3) will detect that the short-circuit voltage for obtaining is converted to short-circuit current value and calculates the target times of short-circuit voltage and short circuit current
Whether number, judge target multiple more than default multiple threshold value, if it is, being judged to IGBT short troubles and sending judgement knot
Really, it is transferred to execution step (4)；If it has not, return performing step (2)；
(4) driving pulse is reduced to negative level, drives IGBT shut-offs.
Because the manufacturer of IGBT typically only provides the homologous thread table of short circuit voltage value and short circuit current, and both it
Between have no corresponding functional relation.It is generation short circuit voltage value and the mapping table of short circuit current, by IGBT in the present embodiment
Short circuit voltage value and the curve table of short-circuit current value be divided into multiple segments, each section of curve short circuit voltage value is obtained according to the following formula
With the corresponding relation of short-circuit current value, all sections of corresponding relation constitutes IGBT short circuit voltage values and the correspondence of short-circuit current value is closed
It is table.
Yn=KnX(Xn≤X≤Xn+1)
Wherein, YnIt is n-th section of short-circuit current value, X is n-th section of short circuit voltage value, KnFor n-th section of short-circuit voltage with it is short
The multiple proportion of road electric current.
Short-circuit current value and short circuit voltage value mapping table after treatment be：
Y1=K1X(X1≤X≤X2)
………………………………；
Yn=KnX(Xn≤X≤Xn+1)
The Duan Yue being divided into is more, and the corresponding relation for obtaining gets over the curve of approaching to reality, and to the memory requirement of chip
It is higher.In general, taking 10 sections of broken lines can meet the right of short circuit voltage value and short-circuit current value in demand, therefore the present embodiment
Answer curve to be divided into 10 segments, i.e. n and take 10.
In the present embodiment, the mapping table of each the IGBT short circuit voltage value for generating and short-circuit current value is deposited
Storage, and sets short-circuit threshold value, including set unified short-circuit voltage threshold value V1, short circuit voltage value and short-circuit current value times
Number threshold value K.The mapping table output of the threshold value V1, the threshold value K and each IGBT of multiple of the short-circuit voltage that will be set,
The criterion of short trouble when being detected as each IGBT.
In the present embodiment, after start-up operation, to the transmission positive level driving pulse of IGBT real-time continuous, IGBT is received and driven
Moving pulse simultaneously drives open-minded, and IGBT detects the magnitude of voltage at each IGBT two ends after opening, according to the corresponding short circuits of IGBT of storage
Short-circuit voltage is converted to short-circuit current value by magnitude of voltage with the mapping table of short-circuit current value, and calculates the short circuit electricity after conversion
Flow valuve and the target multiple M of short circuit voltage value, are compared with default multiple threshold value K, if target multiple M exceedes multiple door
Limit value K, judges that IGBT is in short trouble.Malfunction result of determination control according to each IGBT changes corresponding driving arteries and veins
The level of punching, when determining IGBT and short trouble occur, positive level driving pulse is reduced to after negative level and is sent to IGBT, is driven
Dynamic IGBT is turned off.
The present invention is stored the short-circuit voltage of short-circuit threshold value and each IGBT with the corresponding relation of short circuit current, is entered
During row IGBT short-circuit detectings, the short-circuit voltage for detecting is compared with the threshold value of storage and the corresponding relation of each IGBT,
Judge the malfunction of IGBT, when there is short trouble, IGBT is turned off in time, implementation method is simple, it is ensured that all of
The protection threshold value of IGBT is consistent, it is to avoid protection misoperation or the generation being failure to actuate, and realizes multiple IGBT short-circuit detectings and protection
Be uniformly coordinated work.
In the present embodiment, the IGBT Damage by Short Circuit determination flows before performing step (1) are additionally included in, IGBT is open-minded driving
Whether preceding detection IGBT damages, and concrete methods of realizing is：The voltage at detection IGBT two ends, determines whether less than the short circuit electricity for setting
Pressure gate limit value, if it is, being judged to IGBT Damage by Short Circuit failure and sending result of determination, sending negative level to IGBT drives arteries and veins
Punching, drives IGBT shut-offs；If it has not, performing step (1).
As shown in figure 3, the method that multiple IGBT short-circuit protections are detected and protected in the specific embodiment of the invention, according to setting
The threshold value V1 of short-circuit voltage, the mapping table of the threshold value K and each IGBT of multiple carry out short-circuit detecting and protection, walk
Suddenly it is：
(2.1) whether detecting system starts working, if it has not, execution step (2.2) is transferred to, if it is, be transferred to performing step
Suddenly (2.3)；
(2.2) magnitude of voltage at detection IGBT two ends, determines whether less than default short-circuit voltage threshold value V1, if it is,
It is judged to IGBT Damage by Short Circuit malfunctions, sends Fisrt fault status information, and negative level driving pulse is sent to IGBT, drives
Dynamic IGBT shut-offs；If it has not, return performing step (2.1)；
(2.3) positive level driving pulse is sent to IGBT, drives IGBT open-minded, IGBT starts working；
(2.4) the magnitude of voltage V at detection IGBT two ends, judges whether more than default short-circuit voltage threshold value V1, if it is,
It is judged to IGBT inside open fault state, sends the second fault status information, and driving pulse is reduced to negative level, drives
IGBT is turned off, and is returned and is performed step (2.1)；If it has not, being transferred to execution step (2.5)；
(2.5) the multiple M of short-circuit voltage and short circuit current is calculated according to mapping table, is judged whether more than setting
Multiple threshold value K, if it is, be judged to IGBT short troubles state and send the 3rd fault status information, by driving pulse
Negative level is reduced to, IGBT shut-offs are driven, is returned and is performed step (2.1).
During work, the working condition of detecting system first, judgement is in holding state or working condition, if in treating
Under machine state, system IGBT receives negative pulse, and IGBT should be at off state, if the CE both end voltages V for detecting IGBT is low
In the short-circuit voltage threshold value V1 for setting, illustrate that now IGBT has been in Damage by Short Circuit failure, i.e., it is short in voltage breakdown type
Road failure, sends Fisrt fault status information.If system has started, and detects the CE both end voltages V of IGBT and be more than
The short-circuit voltage threshold value V1 of setting, illustrates to have been opened a way inside IGBT, that is, open fault occur, sends the second malfunction letter
Breath；If detecting the CE both end voltages V of IGBT less than the short-circuit voltage threshold value V1 for setting, rated current is first converted thereof into
Multiple M, whether judge multiple M more than default multiple threshold value K, if greater than default multiple threshold value K, judge IGBT
In overcurrent type short trouble, and send the 3rd fault status information.
In the present embodiment, the fault status information according to each IGBT controls the transmission of corresponding driving pulse, to protect
IGBT is not damaged by.When the malfunction of IGBT is voltage breakdown type short trouble, that is, when receiving Fisrt fault information, send
Negative level driving pulse, turns off IGBT, and system keeps holding state；When the malfunction of IGBT is open fault, that is, receive
During the second fault message, driving pulse drops to negative level, turns off IGBT, and system returns to holding state；When the malfunction of IGBT
It is when overcurrent type short trouble, that is, when receiving three fault status informations, driving pulse to be dropped to negative level immediately,
System enters holding state after driving shut-off IGBT, IGBT shut-off.
The present invention by detect IGBT two ends short-circuit voltage and different IGBT short-circuit voltage and short circuit current it
Between corresponding relation judge the malfunction of IGBT respectively, and accurate classification treatment is carried out to malfunction, including short circuit is damaged
Bad failure, open fault and short trouble, IGBT shut-offs are driven when breaking down, and implementation method is simple, can efficiently, it is smart
The true short-circuit detecting and defencive function of realizing multiple IGBT.
In the present embodiment, output short circuit current and fault status information and with wave file after IGBT short-circuit detectings are carried out
Form shown, to obtain the short circuit current size of precise quantification, be easy to ex-post analysis, at the same IGBT occur short circuit therefore
Fault message can be in time observed during barrier, to carry out troubleshooting in time；In actual applications, can in real time be transported according to IGBT
Row state is configured and changes to short-circuit threshold value, using flexible, applied widely.
As shown in Figure 4,5, the present embodiment multiple IGBT short-circuit detectings and protection device, including multiple short-circuit detection protection moulds
Block 1, center treatment transport module 2, human-computer interaction module 3, communication module 4, multiple power modules 5, each short-circuit detection protection
Module 1, center treatment transport module 2, human-computer interaction module 3 connect a power module 5 respectively, and each power module 5 is input into
AC or D/C power, there is provided to the power needed for modules.Each short-circuit detection protection module 1 correspondence connection one
IGBT, short-circuit detecting and protection are carried out to IGBT, and each short-circuit detection protection module 1 includes driver element, short-circuit detection protection
Unit, wherein driver element are used for driving IGBT open-minded to correspondence IGBT transmission driving pulses, if driving pulse is positive level, drive
Dynamic IGBT is open-minded, if driving pulse is negative level, drives IGBT shut-offs.Short-circuit detection protection unit is for real-time detection correspondence
The magnitude of voltage at IGBT two ends, judges whether more than default short-circuit voltage threshold value, after IGBT drives and opens if it is, judging
For IGBT inside open fault and result of determination is sent, driving pulse is reduced to negative level, exported to driver element, drive IGBT
Shut-off；If it has not, short-circuit voltage is converted into short-circuit current value and the target multiple of short-circuit voltage and short circuit current is calculated, judge
Whether target multiple is more than default multiple threshold value, if it is, being judged to IGBT short troubles and sending result of determination, will drive
Moving pulse is reduced to negative level, exports to driver element, drives IGBT shut-offs.
In the present embodiment, human-computer interaction module 3 is used for carrying out short-circuit threshold value setting and result shows.Each short-circuit detecting
Protection module 1 is connected by a center treatment transport module 2 with human-computer interaction module 3, transmits each short-circuit detection protection mould
Data between block 1 and human-computer interaction module 3.The data of human-computer interaction module 3 are then transmitted to center by communication module 4 and processed
In transport module 2 or reception center processes the interim data of the output of transport module 2.
In the present embodiment, the correspondence of each IGBT short circuit voltage value and short-circuit current value is generated by human-computer interaction module 3
Relation table is simultaneously stored, and sets short-circuit threshold value, and corresponding driving pulse is sent to each IGBT.Driver element is received and driven
Pulse is to drive IGBT, if driving pulse is positive level, drives IGBT open-minded, if driving pulse is negative level, drives IGBT to close
It is disconnected.Short-circuit detection protection module 1, detects the magnitude of voltage at each IGBT two ends, according to the short-circuit voltage that human-computer interaction module 3 is exported
The mapping table of threshold value, multiple threshold value and the corresponding short circuit voltage values of IGBT and short-circuit current value judges the failure of IGBT
State, output short circuit current value and malfunction result of determination to human-computer interaction module 3 are shown.Short-circuit detection protection module
1 transmission that corresponding driving pulse is controlled according to the malfunction of IGBT, when the malfunction of IGBT is short trouble, will drive
Moving pulse is reduced to negative level, exports to driver element, drives IGBT to be turned off.
As shown in figure 5, the interface connection of the present embodiment multiple IGBT short-circuit detectings and protection device, center treatment transmission mould
Block 2 is connected with RS485 communication modes by communication module 4 with human-computer interaction module 3, short with each in SPI master-slave communications mode
Road detection protection module 1 is connected with each other, transmission single line correspondence one short-circuit detection protection module 1 of connection, transmits man-machine friendship
Mutual data between module 3 and each short-circuit detection protection module 1.Data terminal, the clock port of center treatment transport module 2
SD0, SD1, SCLK data terminal respectively with each short-circuit detection protection module 1, clock port SD0, SD1, SCLK are connected, each
The CS ends of short-circuit detection protection module 1 are connected with the CS ends of center treatment transport module 2, the data of center treatment transport module 2
Receive, send and enable data receiver, transmission and Enable Pin RX_485, TX_ of interface RX, TX, EN485 and communication module 4
485th, EN485 connections, the data receiver of human-computer interaction module 3, the data receiver of transmitting terminal RX, TX and communication module 4 and transmission
End A+ with B- ends are connected.Each input of power module 5 connects direct current ACorDC, and power output end VCC1+, VCC1- connection are each
The power input VCC1+ and VCC1- of individual module.
In the present embodiment, it is configured by 3 pairs of short-circuit threshold values of human-computer interaction module first, including short-circuit voltage is set
The multiple threshold value K of threshold value V1, short-circuit current value and short circuit voltage value, and generate each IGBT short-circuit voltage according to formula (1)
The mapping table of value and short-circuit current value, the threshold value K together with short-circuit voltage threshold value V1, multiple is sent out by communication module 4
Center treatment transport module 2 is given, center treatment transport module 2 is handed down to each corresponding short-circuit detecting in SPI communication mode
Protection module 1.
Before system starts, by the voltage at short detection unit detection IGBT two ends, determine whether less than setting
Short-circuit voltage threshold value, if it is, Damage by Short Circuit has occurred in explanation IGBT, sending negative level to IGBT from driver element drives
Pulse, drives IGBT shut-offs；If it has not, system starts, by human-computer interaction module 3 in the way of RS485 by the mould that communicates
Block 4 transmits different positive level driving pulse to center treatment transport module 2, by center treatment transport module 2 with list
The mode of line transmission is sent to corresponding short-circuit detection protection module 1, and each short-circuit detection protection module 1 is in corresponding driving pulse
Driving under it is open-minded.
Each short-circuit detection protection module 1 starts short-circuit detecting work, the magnitude of voltage at each IGBT two ends is detected, according to people
The mapping table of the short-circuit threshold value, the corresponding short circuit voltage values of IGBT and short-circuit current value of the output of machine interactive module 3 judges
The malfunction of current IGBT, if detecting the CE both end voltages Vce of IGBT more than the short-circuit voltage threshold value V1 for setting, explanation
Opened a way inside IGBT, that is, IGBT open faults occurred, driving pulse has been reduced to low level and exported and gives driver element driving
IGBT is turned off, and protection IGBT is not damaged by；If detecting the CE both end voltages Vce of IGBT less than the short-circuit voltage threshold value for setting
V1, then short circuit voltage value is first converted into the target multiple of IGBT rated current according to mapping table, judges that target multiple is
It is no, if greater than multiple threshold value K, to judge that IGBT is in short trouble more than default multiple threshold value K, driving pulse is dropped
For low level and export to driver element drive IGBT shut-off, protection IGBT be not damaged by.Short circuit current and malfunction are sentenced
Determine result and transmitted to human-computer interaction module 3 by data transmission unit in SPI communication mode to be shown in the form of wave file
Show, judge to change upgrading with system afterwards to be analyzed.
As shown in fig. 6, the circuit structure of present invention treatment transport module in center in concrete application embodiment, wherein U10B
It is programmable logic chip, is received come to the data of human-computer interaction module 3 by RS485 modes, by data receiver sum
It is attached according to transmitting terminal RX, TX, is then distributed to each corresponding short-circuit detection protection module 1, and receive each short circuit inspection
Human-computer interaction module 3 is transferred to after the data for surveying protection module 1, is transmitted by data terminal SD0, SD1, SCLK, CS, and by
Driving pulse is transmitted at data terminal PWM ends, and Data Collection is realized in human-computer interaction module 3 and each short-circuit detection protection module 1
And transfer function.Wherein, U10A-U10G is the various pieces that center processes programmable logic chip U10, and U10A~U10C is number
According to part, U10F, U10G are working power part, and U10E is program burn writing part.G2 is crystal oscillator, gives programmable logic chip core
Piece U10 provides working frequency pulse CLK, by the 7th diode D7, the 28th resistance R28 and the 29th resistance R29, the tenth
Seven electric capacity C17 produce a reset pulse RST to give programmable logic chip U10.XZ1 is burning program interface, for may be programmed
Logic chip U10 is connected with PC.Power supply chip U1 is used to produce a working power VCC, is programmable logic chip chip
U10 provides working power.Center treatment transport module 2 uses single line to each short-circuit detection protection module 1 transmission driving pulse,
Transmission speed is fast, and center treatment transport module 2 is then carried out with each short-circuit detection protection module 1 using SPI master-slave communications mode
Communication, sets the thresholding of human-computer interaction module 3 data and is transferred to each short-circuit detection protection module 1 and receives each short circuit inspection
The data of the output of protection module 1 are surveyed, its transmission information amount is big.
In the present embodiment, short-circuit detection protection unit includes the short-circuit voltage collection subelement, the short circuit current that are sequentially connected
Treatment subelement and testing result output subelement.The voltage at short-circuit voltage collection subelement collection IGBT two ends, exports to short
Road current processing subelement, short circuit current processes subelement and will detect that the short-circuit voltage for obtaining is converted to short circuit current, calculates
Short-circuit current value and the target multiple of short circuit voltage value, IGBT is judged according to default short-circuit voltage threshold value and multiple threshold value
Malfunction, by testing result export subelement output short circuit current value and malfunction result of determination.
As shown in fig. 7, present invention short-circuit detection protection modular circuit structure in concrete application embodiment, short circuit electricity
Pressure Acquisition Circuit uses high-speed AD sampling A/D chip, and short circuit current process circuit uses programmable logic chip, testing result output
Circuit uses optocoupler U5, and driver element uses high speed photo coupling U15, while being changed short-circuit voltage using programmable logic chip U2
For short circuit current and the multiple of short circuit current and short-circuit voltage is calculated, according to default short-circuit voltage threshold value and multiple door
Limit value judges the malfunction of IGBT, and controls the transmission of IGBT driving pulses, realizes the short-circuit protection of IGBT.Wherein Q1 is
IGBT, U2 are programmable logic chip, and U2A-U2G is the various pieces of chip, by center treatment programmable chip U1 to power supply
Linear voltage stabilization is carried out, sampled signal is exported to FPGA by after operational amplifier U3, high-speed AD sampling A/D chip U4 treatment
Chip U2, exports to center treatment transport module 2 by optocoupler U5, and high speed photo coupling U15 receives driving pulse PWM and exports to can compile
Journey logic chip U2 processed after output driving IGBT.Programmable logic chip U2 working power ground GN1 directly and IGBT
E extremely be connected, the C poles of IGBT are connected to major loop (voltage is from 380V to 10000V during real work).Short-circuit threshold value by
Human-computer interaction module 3 is configured, then transmits into programmable logic chip U2, and protection is immediately treated after detecting failure, real
Shi Xinggao, then by SPI communication mode transmit data to center treatment transmission chip U1, data transmission interface be CS, SCLK,
SD0 and SD1, transmitting data information amount is big, comprehensively reflection IGBT malfunctions, and short-circuit threshold value can be changed at any time, can be fitted
Answer different types of IGBT.The power supply of each short-circuit detection protection module 1 is provided by power module 5, including negative and positive dual power
VCC1+ and VCC1-, wherein providing work from negative and positive dual power VCC1+ and VCC1 to IGBT driving pulses and operational amplifier U3
Power supply, positive supply VCC1+ after linear voltage stabilization chip U1 treatment by obtaining power supply VCC2+ and is supplied to programmable logic chip U2
And ultra high speed A/D conversion chip U4.
In the present embodiment, high tension loop side will be placed on for the programmable logic chip U2 of short-circuit detecting and short-circuit protection,
Short-circuit detecting and protection directly are carried out to IGBT, its real-time is high.The power work ground part U2G of programmable logic chip U2 draws
Pin is extremely connected with the E of IGBT Q1, is and is connected with ground GND1, and programmable logic chip U2 pin designations are IOZ1's and IOZ9
Pin works, and with clear and definite level signal, wherein minimum level is GND1, and maximum level is VCC2+, and is not made in chip
Pin, such as pin of label IO1 to IO23 are then connected by resistance (resistance marked as R12-R37) with ground GND1,
Also there is clear and definite level GND1, so as to ensure that each pin is not damaged by.In operational pin, i.e. label IOZ1-IOZ9
Pin and power pins by electric capacity (electric capacity marked as C9 to C22) be grounded, major loop power network fluctuation can be suppressed to electricity
Source and the interference of working signal.
During work, the CE both end voltage Vce of IGBT are gathered, 12 bit AD samples at a high speed are entered by amplifier amplifier U3 treatment
In chip U4, programmable logic chip U2 is transferred to by data after AD conversion, programmable logic chip U2 is by after judgement, controlling
The transmission of driving pulse processed, negative level is reduced to when there is short trouble by driving pulse, drives IGBT shut-offs；By SPI communication
IGBT malfunctions result of determination is transmitted to center treatment transport module 2 by mode by optocoupler U5, while being connect by SPI communication line
Receive the data message come to center treatment transport module 2.
As shown in figure 8, multiple IGBT short-circuit detectings and the protection device structural principle in concrete application embodiment of the invention,
Short-circuit detecting and protection are carried out to IGBT using prime detection protection programmable chip, by center treatment programmable chip transmission number
According to prime detection protection programmable chip is with U1 with center treatment programmable chip by optically isolated or Magnetic isolation, the hair of IGBT
Emitter-base bandgap grading C grades of connection main circuit voltage, is 380~10000V voltages in practical application.
The present invention completes short-circuit detecting and defencive function, convenient use and extension using programmable logic chip, while with
When hyperbaric environment, by detect protection module programmable logic chip be placed on high pressure major loop side, its power supply end with
The emitting stage E ends of IGBT are connected or are connected with the emitting stage E ends of IGBT by a resistance, without being isolated, are directly carried out
Accurate detection and real-time guard, break through traditional programmable chip and can only operate in environment under low pressure, it is impossible to be operated in hyperbaric environment
Constraint.
As shown in figure 9, in the present embodiment power module circuit structure, using inverse-excitation type switch power-supply, commutation diode
The alternating current or direct current of input are all converted into direct current by D110~D113, defeated by resistance R101 and voltage-regulator diode D106
Go out and provide power supply, power drives chip U100 controlling switch pipes Q1 switches, in the original of transformer T1 to power supply adjustment chip U100
Side forms a voltage pulse, and voltage pulse is transferred to secondary by transformer T1, and diode D102, electric capacity are passed through by secondary
C101 produces a positive voltage, and a negative voltage is produced by diode D103, electric capacity C102.
As shown in Figure 10, in the present embodiment communication unit circuit structure.Telecommunication circuit is using the RS485 communications with isolation
Chip U2 (ADM2483) is communicated, and D1 and D2 is AF panel diode, suppresses the interference in communication process.
As shown in figure 11, human-computer interaction module circuit interface in the present embodiment, human-computer interaction module 3 and center treatment transmission
Module 2 is connected by the RS485 isolating chips marked as U2, and human-computer interaction module 3 transmits data to center treatment transport module
2, center treatment 2 data for receiving each short-circuit detection protection module 1 of transport module are transmitted to human-computer interaction module 3 and are shown
Show.
Above-mentioned simply presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.Although of the invention
It is disclosed above with preferred embodiment, but it is not limited to the present invention.Any those of ordinary skill in the art, are not taking off
In the case of technical solution of the present invention scope, technical solution of the present invention is made perhaps using the technology contents of the disclosure above all
More possible variation and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every without departing from technical solution of the present invention
Content, according to the technology of the present invention essence to any simple modification, equivalent variation and modification made for any of the above embodiments, all should fall
In the range of technical solution of the present invention protection.
Claims (8)
1. a kind of multiple IGBT short-circuit detectings and guard method, it is characterised in that step is：
(1) to the transmission positive level driving pulse that each IGBT is lasting, IGBT receives driving pulse and drives IGBT open-minded；
(2) magnitude of voltage between each IGBT of real-time detection drain electrodes and source electrode, judges whether more than default short-circuit voltage thresholding
Value, if it is, being judged to IGBT inside open faults and sending result of determination, is transferred to execution step (4)；If it has not, be transferred to holding
Row step (3)；
(3) will detect that the short-circuit voltage for obtaining is converted to short-circuit current value, obtain the target multiple of short-circuit voltage and short circuit current,
Whether target multiple is judged more than default multiple threshold value, if it is, be judged to IGBT short troubles and send result of determination,
It is transferred to execution step (4)；If it has not, return performing step (2)；
(4) driving pulse is reduced to negative level, drives IGBT shut-offs；
Also include the IGBT Damage by Short Circuit determination flows before step (1), concrete methods of realizing is：Detection IGBT drain electrode and source electrode it
Between voltage, determine whether less than set short-circuit voltage threshold value, if it is, being judged to IGBT Damage by Short Circuit failure and sending
Result of determination, negative level driving pulse is sent to IGBT, drives IGBT shut-offs；If it has not, performing step (1).
2. multiple IGBT short-circuit detectings according to claim 1 and guard method, it is characterised in that in the step (3)
To detect that the method that the short-circuit voltage for obtaining is converted to short-circuit current value is：By the short circuit voltage value of IGBT and short-circuit current value
Curve table is divided into multiple segments, and the corresponding relation of each section of curve short circuit voltage value and short-circuit current value, root are obtained according to the following formula
To detect that the short-circuit voltage for obtaining is converted to short-circuit current value according to corresponding relation；
Yn=KnX(Xn≤X≤Xn+1)
Wherein, YnIt is n-th section of short-circuit current value, X is n-th section of short circuit voltage value, KnIt is n-th section of short-circuit voltage and short circuit electricity
The multiple proportion of stream.
3. multiple IGBT short-circuit detectings according to claim 2 and guard method, it is characterised in that by the short circuit electricity of IGBT
The curve table of pressure value and short-circuit current value is divided into 10 segments.
4. a kind of multiple IGBT short-circuit detectings and protection device, it is characterised in that：Including multiple short-circuit detection protection modules (1),
Each described short-circuit detection protection module (1) includes driver element, short-circuit detection protection unit；Each described driver element is to right
The IGBT that answers lasting transmission positive level driving pulse drives IGBT open-minded, each described short-circuit detection protection unit real-time detection
Magnitude of voltage between correspondence IGBT drain electrodes and source electrode, judges whether more than default short-circuit voltage threshold value, if it is, being judged to
IGBT inside open faults simultaneously send result of determination, and positive level driving pulse is reduced into negative level, export to driver element, drive
IGBT is turned off；If it has not, short-circuit voltage is converted into short-circuit current value and the target multiple of short-circuit voltage and short circuit current is calculated,
Whether target multiple is judged more than default multiple threshold value, if it is, be judged to IGBT short troubles and send result of determination,
Positive level driving pulse is reduced to negative level, is exported to driver element, IGBT shut-offs are driven, if it has not, continuing executing with short-circuit inspection
Survey protection location；Before start-up operation, the voltage between short-circuit detection protection unit detection IGBT drain electrodes and source electrode judges
Whether less than the short-circuit voltage threshold value for setting, if it is, sending negative level driving pulse from driver element to IGBT, drive
IGBT is turned off；If it has not, the short-circuit detection protection module (1) is started working.
5. multiple IGBT short-circuit detectings according to claim 4 and protection device, it is characterised in that the short-circuit detecting is protected
Shield unit includes that the short-circuit voltage collection subelement, short circuit current treatment subelement and testing result output that are sequentially connected are single
Unit；Voltage between short-circuit voltage collection subelement collection IGBT drain electrodes and source electrode, exports single to short circuit current treatment
Unit, short circuit current treatment subelement will detect that the short-circuit voltage for obtaining is converted to short circuit current, obtain short-circuit current value with
The target multiple of short circuit voltage value, the malfunction of IGBT is judged according to default short-circuit voltage threshold value and multiple threshold value,
Subelement output short circuit current value and malfunction result of determination are exported by testing result.
6. multiple IGBT short-circuit detectings according to claim 5 and protection device, it is characterised in that at the short circuit current
Reason subelement includes the amplifier, ultra high speed A/D conversion chip and the programmable logic chip that are sequentially connected；The FPGA
Chip is used to for short-circuit voltage to be converted to short circuit current, the multiple of short circuit current and short-circuit voltage is obtained, according to default short circuit
Voltage threshold and multiple threshold value judge the malfunction of IGBT.
7. multiple IGBT short-circuit detectings according to claim 6 and protection device, it is characterised in that the FPGA
The power supply ground of chip is connected with the source electrode of IGBT or is connected with the source electrode of IGBT by a resistance.
8. multiple IGBT short-circuit detectings and protection device according to claim 5 or 6 or 7, it is characterised in that also including with
The human-computer interaction module (3) of each short-circuit detection protection module (1) connection, the human-computer interaction module (3) is including parameter setting
Unit and display touch control unit；The parameter set unit, for generating each IGBT short circuit voltage value and short-circuit current value
Mapping table, and short-circuit voltage threshold value and multiple threshold value are set；The display touch control unit, for receiving short-circuit detecting
The malfunction result of determination of protection module (1) output is simultaneously shown.
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| CN104034997B (en) * | 2014-06-11 | 2017-02-15 | 台达电子企业管理（上海）有限公司 | Power converter and short circuit detection device and method |
| CN105044539B (en) * | 2015-06-29 | 2017-10-24 | 中南大学 | A kind of power device IGBT open faults method for implanting and system |
| CN107094007B (en) * | 2017-03-08 | 2020-07-21 | 全球能源互联网研究院有限公司 | IGBT overcurrent protection method and device |
| CN106950422B (en) * | 2017-03-20 | 2019-06-14 | 深圳市同安德方科技有限公司 | A kind of high voltage frequency converter power self-checking circuit and method |
| CN107450004A (en) * | 2017-07-31 | 2017-12-08 | 珠海格力电器股份有限公司 | Fault detection method and circuit |
| CN110244210B (en) * | 2019-07-04 | 2021-10-15 | 福州丹诺西诚电子科技有限公司 | Breakdown detection method for IGBT unit |
| CN110501601B (en) * | 2019-09-26 | 2021-10-22 | 中国航空工业集团公司西安飞机设计研究所 | Device and method for determining short-circuit protection time of solid-state power device |
| CN111736054B (en) * | 2020-06-23 | 2022-09-16 | 中国南方电网有限责任公司超高压输电公司 | Test circuit for IGBT drive desaturation protection function and simulation test method thereof |
| CN113824089B (en) * | 2021-09-29 | 2024-04-02 | 深圳市英威腾电气股份有限公司 | IGBT fault protection method and device |
| CN114509669A (en) * | 2022-04-18 | 2022-05-17 | 华邦创科(惠州市)智能科技有限公司 | IGBT switch damage detection device and detection method of single-phase intelligent power utilization protector |
| CN116565802B (en) * | 2023-07-11 | 2024-05-17 | 深圳艾为电气技术股份有限公司 | PTC control method and device based on power tube protection |
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