CN110108999A - A kind of IGBT module working junction temperature on-line detecting system and method - Google Patents
A kind of IGBT module working junction temperature on-line detecting system and method Download PDFInfo
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- CN110108999A CN110108999A CN201910375106.2A CN201910375106A CN110108999A CN 110108999 A CN110108999 A CN 110108999A CN 201910375106 A CN201910375106 A CN 201910375106A CN 110108999 A CN110108999 A CN 110108999A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2608—Circuits therefor for testing bipolar transistors
- G01R31/2619—Circuits therefor for testing bipolar transistors for measuring thermal properties thereof
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Abstract
The present invention provides a kind of IGBT module working junction temperature on-line detecting system and method, which includes: power conversion topologies unit, driving unit, signal acquisition unit, exciting unit and control unit.Wherein, the target component of signal acquisition unit acquisition power topology unit.Control unit is based on target component, determine the switch state of IGBT module to be detected, when IGBT module to be tested is not passed through main power current, obtain the saturation voltage drop for flowing through freewheeling diode of signal acquisition unit acquisition, based on saturation voltage drop, the working junction temperature of IGBT module to be tested is determined.It can be seen that, IGBT module working junction temperature on-line detecting system provided by the invention, it can be when IGBT module to be tested be not passed through main power current, it controls exciting unit and carries out exciting current output, and obtain the saturation voltage drop for flowing through freewheeling diode of signal acquisition unit acquisition, based on saturation voltage drop, the working junction temperature of IGBT module to be tested is determined, realize the function of on-line checking junction temperature.
Description
Technical field
The present invention relates to testing techniques of equipment fields, and in particular to a kind of IGBT module working junction temperature on-line detecting system and
Method.
Background technique
Current transformer is the alternating current of grid side to be commonly converted to direct current in electricity generation system, then direct current is converted to
The device of the alternating current of motor side comprising the semiconductor switch of multiple parallel connections, by the switch combination state of semiconductor switch,
Realize the conversion of above-mentioned AC-DC.Specifically, semiconductor switch can have switch function for IGBT, IGCT and IEGT etc.
The device of energy.IGBT is by static characteristics and short switches such as its high voltage blocking ability, low conduction voltage drop and high current densities
The dynamic characteristics such as time, low switching losses, high tolerance, are widely used.
However, the operating voltage of power module IGBT, electric current are larger in high-power converter system, so that its function
Consumption and junction temperature of chip are higher, once temperature is excessively high, will lead to IGBT damage, and then lead to the high-power converter system failure.
Therefore, a kind of IGBT module working junction temperature detection method how is provided, work knot that can online to IGBT module
Temperature is detected, and then ensures the stability of high-power converter operation, is those skilled in the art's big skill urgently to be resolved
Art problem.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of IGBT module working junction temperature online test method, realize pair
The working junction temperature detection of IGBT module in current transformer, it is ensured that the stability of high-power converter operation.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of IGBT module working junction temperature on-line detecting system is applied to converter system, which includes: power
Transformation topology unit, driving unit, signal acquisition unit, exciting unit and control unit,
The power conversion topologies unit includes the IGBT module of multiple freewheeling diodes in parallel；
The driving unit, for receiving the first control signal of described control unit output, the IGBT module is based on
The first control signal is switched on and off；
Signal acquisition unit, for acquiring the target component of the power topology unit, the target component includes described
The input terminal voltage of power topology unit, input terminal electric current, the output end voltage of the power topology unit, output end current with
And the saturation voltage drop of the freewheeling diode is flowed through after injection exciting current；
Exciting unit, for exporting the exciting current to IGBT module to be tested；
Control unit exports the first control signal for the control model based on current transformer, so that the power becomes
It changes topology unit and is based on first control signal progress power conversion, and be based on the target component, determine to be detected
The switch state of IGBT module obtains the signal acquisition when the IGBT module to be tested is not passed through main power current
The saturation voltage drop for flowing through the freewheeling diode of unit acquisition, is based on the saturation voltage drop, determines described to be tested
The working junction temperature of IGBT module.
Optionally, further includes: junction temperature display unit,
The work for the IGBT module to be tested that the junction temperature display unit is used to determine described control unit
Junction temperature is shown.
Optionally, the exciting unit persistently exports the exciting current to IGBT module to be tested,
Or,
The second control signal that the exciting unit is exported based on described control unit exports the exciting current to be measured
The IGBT module of examination.
Optionally, described control unit is based on the saturation voltage drop, determines the work of the IGBT module to be tested
Junction temperature, comprising:
Based on the corresponding relationship of preset diode (led) module junction temperature and saturation voltage drop, determine corresponding with the saturation voltage drop
The IGBT module to be tested working junction temperature.
A kind of IGBT module working junction temperature online test method, the IGBT module working junction temperature above-mentioned applied to any one
On-line detecting system, including
Based on the first control signal of control unit output, control IGBT module is switched on and off；
The target component of the power topology unit is acquired, the target component includes the input of the power topology unit
It is flowed after end voltage, input terminal electric current, the output end voltage of the power topology unit, output end current and injection exciting current
Saturation voltage drop through the freewheeling diode；
Based on the target component, the switch state of IGBT module to be detected is determined, when the IGBT mould to be tested
When block is not passed through main power current, output drive electric current is to IGBT module to be tested and acquisition flows through the freewheeling diode
Saturation voltage drop；
Based on the saturation voltage drop, the working junction temperature of the IGBT module to be tested is determined.
Optionally, further includes:
The working junction temperature for the IGBT module to be tested that described control unit is determined is shown.
Optionally, the exciting current is persistently exported to IGBT module to be tested,
Or,
Based on the second control signal of described control unit output, the exciting current is exported to IGBT mould to be tested
Block.
Optionally, described to be based on the saturation voltage drop, it determines the working junction temperature of the IGBT module to be tested, wraps
It includes:
Based on the corresponding relationship of preset diode (led) module junction temperature and saturation voltage drop, determine corresponding with the saturation voltage drop
The IGBT module to be tested working junction temperature.
Optionally, further includes:
Control model based on the target component and the current transformer, exports the second control signal.
Optionally, comprising:
When opening for the preset switches state of IGBT module in the control model and the IGBT module to be detected determined
When off status is off state, the second control signal is exported.
Based on the above-mentioned technical proposal, the embodiment of the invention provides a kind of IGBT module working junction temperature on-line detecting system,
It include: power conversion topologies unit, driving unit, signal acquisition unit, exciting unit and control unit.Wherein, the function
Rate transformation topology unit includes the IGBT module of multiple freewheeling diodes in parallel.The driving unit is single for receiving the control
The first control signal of member output, the IGBT module are based on the first control signal and are switched on and off.Signal acquisition
Unit is used to acquire the target component of the power topology unit, and the target component includes the input of the power topology unit
It is flowed after end voltage, input terminal electric current, the output end voltage of the power topology unit, output end current and injection exciting current
Saturation voltage drop through the freewheeling diode.Exciting unit is for exporting the exciting current to IGBT module to be tested.Control
Unit processed is used for the control model based on current transformer, the first control signal is exported, so that the power conversion topologies unit
Power conversion is carried out based on the first control signal, and is based on the target component, determines opening for IGBT module to be detected
Off status obtains the stream of the signal acquisition unit acquisition when the IGBT module to be tested is not passed through main power current
Saturation voltage drop through the freewheeling diode is based on the saturation voltage drop, determines the work of the IGBT module to be tested
Junction temperature.As it can be seen that IGBT module working junction temperature on-line detecting system provided by the invention, can not flow in IGBT module to be tested
When through main power current, control exciting unit carries out exciting current output, and obtains flowing through for the signal acquisition unit acquisition
The saturation voltage drop of the freewheeling diode is based on the saturation voltage drop, determines the work knot of the IGBT module to be tested
Temperature realizes the function of on-line checking junction temperature.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of a kind of schematic diagram of application circuit of the low current saturation voltage drop method provided in the prior art；
Fig. 2 is a kind of schematic diagram of another application circuit of the low current saturation voltage drop method provided in the prior art；
Fig. 3 is a kind of structural schematic diagram of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention；
Fig. 4 is a kind of another structural representation of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Figure；
Fig. 5 is a kind of another structural representation of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Figure；
Fig. 6 is a kind of another structural representation of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Figure；
Fig. 7 is a kind of another structural representation of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Figure；
Fig. 8 is a kind of another structural representation of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Figure；
Fig. 9 is a kind of flow diagram of IGBT module working junction temperature online test method provided in an embodiment of the present invention.
Specific embodiment
As described in background, in high-power converter system, the operating voltage of power module IGBT, electric current compared with
Greatly, so that its power consumption and junction temperature of chip are higher, once temperature is excessively high, it will lead to IGBT damage, and then lead to great power conversion circuit
The device system failure.
Therefore, it is necessary to the working junction temperatures to IGBT module to detect.The working junction temperature detection side of common IGBT module
Method includes:
1. formula mensuration is physically contacted:
Using the inside circumstance temperature or external shell temperature of the temperature elements such as thermistor or thermocouple measurement IGBT module.And the party
Temperature measuring point in method generally has a certain distance apart from IGBT module, causes measurement error larger.Except this, the response that temperature measures
Speed is relatively slow (second grade), is more suitable for the detection of mean temperature, cannot reflect IGBT module in the transient states mistake such as switching in real time
Variations injunction temperature in journey.
2. optical non-contact mensuration:
IGBT module inside chip junction temperature is observed using equipment such as infrared thermal imagers.Before measuring, IGBT mould need to be opened
The encapsulation of block, the transparent silicone grease and blacking igbt chip for removing chip surface.Such method, it is destructive strong, it is suitable for experiment
Room contrast verification is not used to the on-line checking of converter system IGBT module.
3. thermal impedance model prediction:
By to IGBT module internal material (silicon base chip, silicone grease, DBC substrate and copper base) and external heat sink etc.
Thermal characteristic analysis is carried out, thermal resistance network model is established.The power consumption of IGBT module is calculated further according to the operating condition of current transformer, is tied
Close external heat sink temperature and thermal resistance network model, the anti-junction temperature for releasing IGBT module.In this method, thermal resistance network model is built
Vertical difficulty, and with the longtime running of converter system, solder layer and heat-conducting silicone grease under IGBT module substrate will appear difference
The aging of degree.
4. thermo-responsive electrical parameter extraction method:
Since the interior microscopic physical parameter and device junction temperature of semiconductor devices have one-to-one mapping relations,
It can reflect the junction temperature of inside chip by electric parameter outside measurement IGBT module.This method is encapsulated without destroying IGBT module,
Junction temperature detection can be fast implemented in 100uS, be suitable for industrial practical application.
Specifically, thermo-responsive electrical parameter junction temperature extraction method includes low current saturation voltage drop method, Bulk current injection method, driving electricity
Pressure drop ratiometer method etc..
Wherein, Bulk current injection method can cause as pyrogenicity electric current itself the self-heating effect of junction temperature because of its load current, no
It is evitable to bring measurement error.
Driving voltage drop ratiometer method needs monitor relevant parameter under different driving voltage condition, in practical converter system
In, online change driving voltage amplitude is difficult to realize, and will increase current transformer failure risk using improper driving voltage.
And as shown in Figure 1, in calibration phase, low current saturation voltage drop method is by IGBT module as heating in insulating box,
When junction temperature of chip temperature is when known set temperature Tj0, the exciting current Im of closure switch S2 (S1 disconnection), 100mA or so are infused
Enter in IGBT module, records the saturation pressure depreciation Vce-sat0 of IGBT module at this temperature.From -40 ° to 175 in ° temperature range,
Corresponding saturation pressure depreciation is successively recorded at interval of 5 °, linear fit and least square method method are used to the data obtained, obtained
The functional relation and curve graph of junction temperature Tj and saturation voltage drop Vce-sat.
When actual test junction temperature, as shown in Fig. 2, closure switch S1 (S2 disconnection), real work electric current Ic flows through IGBT mould
Block causes junction temperature of chip to increase, and then turns off S1 and is closed S2 injection exciting current Im again, carries out the test of saturation voltage drop.
The functional relation of the junction temperature and saturation voltage drop that obtain according to surveyed saturation pressure depreciation and before this, counter can release IGBT module and flow through
The junction temperature of chip of Ic electric current.
But inventors have found that this method in measurement process, needs to apply driving voltage always to IGBT module Vge, i.e.,
IGBT module is connected always.And IGBT module mostly occurs with upper and lower bridge arm structure in pairs in practical converter system, therefore uses
The program, it may appear that the straight-through situation of down tube in the IGBT module of bridge arm, and then converter system is caused irreversible event occur
Barrier damage.
Therefore, a kind of IGBT module working junction temperature detection method how is provided, work knot that can online to IGBT module
Temperature is detected, and is those skilled in the art's big technical problem urgently to be resolved.
Referring to Fig. 3, Fig. 3 is a kind of knot of IGBT module working junction temperature on-line detecting system provided in an embodiment of the present invention
Structure schematic diagram, the system include: power conversion topologies unit 1, driving unit 2, signal acquisition unit 3, exciting unit 4 and control
Unit 5 processed.
Wherein, the power conversion topologies unit includes the IGBT module of multiple freewheeling diodes in parallel；
In the present embodiment, power conversion topologies unit can be by multiple IGBT modules containing freewheeling diode in parallel with
The circuit unit of the common transformation topology of power electronics (half-bridge, full-bridge circuit of such as upper and lower bridge arm form) composition.
The driving unit, for receiving the first control signal of described control unit output, the IGBT module is based on
The first control signal is switched on and off；
Signal acquisition unit, for acquiring the target component of the power topology unit, the target component includes described
The input terminal voltage of power topology unit, input terminal electric current, the output end voltage of the power topology unit, output end current with
And the saturation voltage drop of the freewheeling diode is flowed through after injection exciting current；
Exciting unit, for exporting the exciting current to IGBT module to be tested；
Control unit exports the first control signal for the control model based on current transformer, so that the power becomes
It changes topology unit and is based on first control signal progress power conversion, and be based on the target component, determine to be detected
The switch state of IGBT module obtains the signal acquisition when the IGBT module to be tested is not passed through main power current
The saturation voltage drop for flowing through the freewheeling diode of unit acquisition, is based on the saturation voltage drop, determines described to be tested
The working junction temperature of IGBT module.
As it can be seen that IGBT module working junction temperature on-line detecting system provided by the invention, it can be in IGBT module to be tested
When being not passed through main power current, control exciting unit carries out exciting current output, and obtains the signal acquisition unit acquisition
The saturation voltage drop of the freewheeling diode is flowed through, the saturation voltage drop is based on, determines the work of the IGBT module to be tested
Make junction temperature, realizes the function of on-line checking junction temperature.
It, can also be with it should be noted that in the present embodiment, power conversion topologies unit is not limited to DC/AC converter
It is AC/DC converter, is also possible to DC/DC converter, can also be semi-bridge alternation topology or full-bridge transformation topology.It can be
Two level circuits are also possible to more level (three level, five level) circuit etc..
Control unit 5 is not limited to DSP, is also possible to single-chip microcontroller, is also possible to other digital processing systems such as FPGA.
Except this, the IGBT module working junction temperature on-line checking scheme that the present embodiment proposes is equally applicable to other semiconductors
The working junction temperature on-line checking of device.Such as MOSFET, it is contemplated that MOSFET parasitism freewheeling diode itself can directly utilize small electricity
The saturation voltage drop that stream saturation voltage drop method tests its parasitic diode counter pushes away metal-oxide-semiconductor junction temperature.
On the basis of the above embodiments, as shown in figure 4, a kind of IGBT module working junction temperature provided in this embodiment is online
Detection system, further includes: junction temperature display unit 6.
The work knot for the IGBT module to be tested that the junction temperature display unit is used to determine described control unit
Temperature is shown.Specifically, junction temperature display unit 6 in addition to junction temperature display function, can also cooperate control unit 5 to complete IGBT mould
The other functions such as the early warning of block excess temperature, life prediction.
It is noted that in a kind of IGBT module working junction temperature on-line detecting system provided in this embodiment, it is described
Exciting unit can continue to export the exciting current to IGBT module to be tested or the exciting unit based on the control
The second control signal of unit output, exports the exciting current to IGBT module to be tested.
Schematically, in conjunction with Fig. 5 and Fig. 6, a kind of three level NPC type inverter system IGBT modules are present embodiments provided
Working junction temperature on-line detecting system.
Wherein in Fig. 5, control unit issues PWM wave to driving unit according to the control strategy of inverter, and driving unit is
The IGBT module of each phase bridge arm provides driving Vge in power conversion topologies unit.Signal acquisition unit acquires input, output in real time
The voltages such as port, electric current model simultaneously feed back to control unit, control unit combination PWM modulation strategy and collected voltage and current
Model determines the on off operating mode of IGBT module and reverse parallel connection freewheeling diode.It has just been closed while afterflow two in IGBT module to be measured
Pole pipe is not in the case where afterflow, and IGBT module to be measured has been increased because just flowing through big load current, module junction temperature at this time.Immediately
Control unit controls the exciting current Im that exciting unit injects about 100mA to the freewheeling diode of IGBT module to be measured.Signal is adopted
Collection unit acquires the saturation voltage drop Vr-sat of freewheeling diode in real time and feeds back to control unit, and control unit is corrected according to early period
The functional relation of junction temperature Tj and saturation voltage drop Vr-sat that stage obtains calculate the real-time junction temperature of diode.Junction temperature information to be obtained
Afterwards, control unit issues excitation out code to exciting unit, and exciting unit stops the injection excitation electricity into freewheeling diode
Flow Im.Inverter is continued to run into next switch state.Control unit is transferred to knot by way of communication, by junction temperature information
Temperature display and uploading unit, and junction temperature is carried out by it and shows and be uploaded to cloud.
As shown in fig. 6, being illustrated by taking the detection of A phase bridge arm Ta2IGBT module junction temperature as an example.Wherein, A phase bridge arm IGBT mould
It is as follows that block suits mode:
In the stage one, when A phase bridge arm is in P-state, voltage is equal to 1/2 busbar voltage, that is, VAN=Vdc/2, A phase between AN
Electric current is flowed out from A point, IGBT module Ta1, Ta2 conducting；
In the stage two, when A phase bridge arm is in O state 1, voltage is equal to 0 i.e. VAN=0 between AN, and A phase current is from A point stream
Out, IGBT module Ta2 and clamp diode Da5 conducting；
In the stage three, when A phase bridge arm is in O state 2, voltage is equal to 0 i.e. VAN=0 between AN, and A phase current is from A point stream
Enter, IGBT module Ta3 and clamp diode Da6 conducting；
In the stage four, when A phase bridge arm is in N-state, voltage is equal to -1/2 busbar voltage, that is, VAN=-Vdc/2, A between AN
Phase current is flowed into from A point, IGBT module Ta3, Ta4 conducting.
In stage three, control unit can determine that IGBT module Ta2 to be measured and its reverse parallel connection sustained diode a2 not
Flow through load current Ia, i.e. exciting current Im of the control exciting unit to sustained diode a2 injection about 100mA, signal acquisition
Unit acquires the saturation voltage drop Vr-sat of freewheeling diode in real time and feeds back to control unit, and control unit corrects rank according to early period
The functional relation of junction temperature Tj and saturation voltage drop Vr-sat that section obtains calculate the real-time junction temperature of diode.After junction temperature information to be obtained,
Control unit issues excitation out code to exciting unit, and exciting unit stops injecting exciting current into freewheeling diode
Im.Inverter is continued to run into next switch state.At the same time, control unit is transferred to junction temperature by way of communication
Display and uploading unit, and junction temperature is carried out by it and shows and be uploaded to cloud.
In conjunction with Fig. 7 and Fig. 8, another improved three level NPC type inverter system IGBT module is present embodiments provided
Working junction temperature on-line detecting system.Compared to above-described embodiment, in the present embodiment, exciting unit is anti-to IGBT module to be measured always
Exciting current Im is injected to freewheeling diode in parallel, this can save the switch element that a control exciting unit is opened and is closed
And digital I/O mouthfuls of control unit, further save hardware and software resource.
As shown in fig. 7, exciting unit injects the exciting current of about 100mA to the freewheeling diode of IGBT module to be measured always
Im.Control unit issues PWM wave to driving unit according to the control strategy of inverter, and driving unit is power conversion topologies unit
The IGBT module of interior each phase bridge arm provides driving Vge.Signal acquisition unit acquires the voltages such as input, output port, electric current in real time
Model simultaneously feeds back to control unit, and control unit combination PWM modulation strategy and collected voltage and current model determine IGBT mould
The on off operating mode of block and reverse parallel connection freewheeling diode.It has just been closed while freewheeling diode not afterflow in IGBT module to be measured
In the case of, IGBT module to be measured has been increased because just flowing through big load current, module junction temperature at this time.Signal acquisition unit is adopted in real time
Collect the saturation voltage drop Vr-sat of freewheeling diode and feed back to control unit, control unit is according to the knot that early period, calibration phase obtained
The functional relation of warm Tj and saturation voltage drop Vr-sat calculates the real-time junction temperature of diode.After junction temperature information to be obtained, inverter continues
Operation enters next switch state.Junction temperature information is transferred to junction temperature and is shown and upper leaflet by control unit by way of communication
Member, and junction temperature is carried out by it and shows and be uploaded to cloud.
As shown in figure 8, being illustrated by taking the detection of A phase bridge arm Ta2IGBT module junction temperature as an example.Wherein, A phase bridge arm IGBT mould
It is as follows that block suits mode:
In the stage one, when A phase bridge arm is in P-state, voltage is equal to 1/2 busbar voltage, that is, VAN=Vdc/2, A phase between AN
Electric current is flowed out from A point, IGBT module Ta1, Ta2 conducting；
In the stage two, when A phase bridge arm is in O state 1, voltage is equal to 0 i.e. VAN=0 between AN, and A phase current is from A point stream
Out, IGBT module Ta2 and clamp diode Da5 conducting；
In the stage three, when A phase bridge arm is in O state 2, voltage is equal to 0 i.e. VAN=0 between AN, and A phase current is from A point stream
Enter, IGBT module Ta3 and clamp diode Da6 conducting；
In the stage four, when A phase bridge arm is in N-state, voltage is equal to -1/2 busbar voltage, that is, VAN=-Vdc/2, A between AN
Phase current is flowed into from A point, IGBT module Ta3, Ta4 conducting.
All stages, exciting unit inject the exciting current of about 100mA to the freewheeling diode of IGBT module to be measured always
Im.In stage three, control unit can determine that IGBT module Ta2 to be measured and its reverse parallel connection sustained diode a2 without flow through
Load current Ia, signal acquisition unit acquire the saturation voltage drop Vr-sat of freewheeling diode in real time and feed back to control unit, control
Unit processed calculates that diode is tied in real time according to the functional relation of the junction temperature Tj that early period, calibration phase obtained and saturation voltage drop Vr-sat
Temperature.After junction temperature information to be obtained, inverter is continued to run into next switch state.At the same time, control unit passes through communication
Mode, be transferred to junction temperature and show and uploading unit, and junction temperature is carried out by it and shows and be uploaded to cloud.
As it can be seen that IGBT module working junction temperature on-line detecting system provided by the invention, it can be in IGBT module to be tested
When being not passed through main power current, control exciting unit carries out exciting current output, and obtains the signal acquisition unit acquisition
The saturation voltage drop of the freewheeling diode is flowed through, the saturation voltage drop is based on, determines the work of the IGBT module to be tested
Make junction temperature, realizes the function of on-line checking junction temperature.
On the basis of the above embodiments, the present embodiment additionally provides a kind of IGBT module working junction temperature on-line checking side
Method, as shown in figure 9, it is applied to the above-mentioned IGBT module working junction temperature on-line detecting system of any one, including
S91, the first control signal based on control unit output, control IGBT module are switched on and off；
The target component of S92, the acquisition power topology unit, the target component includes the power topology unit
Input terminal voltage, input terminal electric current, the output end voltage of the power topology unit, output end current and injection exciting current
The saturation voltage drop of the freewheeling diode is flowed through afterwards；
S93, it is based on the target component, the switch state of IGBT module to be detected is determined, when described to be tested
When IGBT module is not passed through main power current, output drive electric current is to IGBT module to be tested and acquisition flows through the afterflow two
The saturation voltage drop of pole pipe；
S94, it is based on the saturation voltage drop, determines the working junction temperature of the IGBT module to be tested.
Except this, a kind of IGBT module working junction temperature online test method provided in this embodiment, further includes:
The working junction temperature for the IGBT module to be tested that described control unit is determined is shown.
Wherein, in the present embodiment, it can continue to export the exciting current to IGBT module to be tested.It is also based on
The second control signal of described control unit output, exports the exciting current to IGBT module to be tested.
Specifically, described be based on the saturation voltage drop, the working junction temperature of the IGBT module to be tested is determined, it can be with
Include:
Based on the corresponding relationship of preset diode (led) module junction temperature and saturation voltage drop, determine corresponding with the saturation voltage drop
The IGBT module to be tested working junction temperature.
On the basis of the above embodiments, the present embodiment additionally provides a kind of IGBT module working junction temperature on-line checking side
Method, comprising:
Control model based on the target component and the current transformer, exports the second control signal.
Wherein, the control model based on the target component and the current transformer exports the second control letter
Number, comprising:
When opening for the preset switches state of IGBT module in the control model and the IGBT module to be detected determined
When off status is off state, the second control signal is exported.
The working principle of this method embodiment refers to the above system embodiment, herein not repeated description.
To sum up, the embodiment of the invention provides a kind of IGBT module working junction temperature on-line detecting systems, comprising: power conversion
Topology unit, driving unit, signal acquisition unit, exciting unit and control unit.Wherein, the power conversion topologies unit
IGBT module including multiple freewheeling diodes in parallel.The driving unit is used to receive the first control of described control unit output
Signal processed, the IGBT module are based on the first control signal and are switched on and off.Signal acquisition unit is for acquiring institute
The target component of power topology unit is stated, the target component includes input terminal voltage, the input terminal of the power topology unit
The afterflow two is flowed through after electric current, the output end voltage of the power topology unit, output end current and injection exciting current
The saturation voltage drop of pole pipe.Exciting unit is for exporting the exciting current to IGBT module to be tested.Control unit is used for base
In the control model of current transformer, the first control signal is exported, so that the power conversion topologies unit is based on described first
It controls signal and carries out power conversion, and be based on the target component, the switch state of IGBT module to be detected is determined, when described
When IGBT module to be tested is not passed through main power current, obtain the signal acquisition unit acquisition flows through two pole of afterflow
The saturation voltage drop of pipe is based on the saturation voltage drop, determines the working junction temperature of the IGBT module to be tested.
As it can be seen that IGBT module working junction temperature on-line detecting system provided by the invention, it can be in IGBT module to be tested
When being not passed through main power current, control exciting unit carries out exciting current output, and obtains the signal acquisition unit acquisition
The saturation voltage drop of the freewheeling diode is flowed through, the saturation voltage drop is based on, determines the work of the IGBT module to be tested
Make junction temperature, realizes the function of on-line checking junction temperature.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of IGBT module working junction temperature on-line detecting system, which is characterized in that be applied to converter system, the on-line checking
System includes: power conversion topologies unit, driving unit, signal acquisition unit, exciting unit and control unit,
The power conversion topologies unit includes the IGBT module of multiple freewheeling diodes in parallel；
The driving unit, for receiving the first control signal of described control unit output, the IGBT module is based on described
First control signal is switched on and off；
Signal acquisition unit, for acquiring the target component of the power topology unit, the target component includes the power
The input terminal voltage of topology unit, input terminal electric current, the power topology unit output end voltage, output end current and note
Enter to flow through after exciting current the saturation voltage drop of the freewheeling diode；
Exciting unit, for exporting the exciting current to IGBT module to be tested；
Control unit exports the first control signal for the control model based on current transformer, so that the power conversion is opened up
It flutters unit and is based on first control signal progress power conversion, and be based on the target component, determine IGBT mould to be detected
The switch state of block obtains the signal acquisition unit and adopts when the IGBT module to be tested is not passed through main power current
The saturation voltage drop for flowing through the freewheeling diode of collection is based on the saturation voltage drop, determines the IGBT module to be tested
Working junction temperature.
2. a kind of IGBT module working junction temperature on-line detecting system according to claim 1, which is characterized in that further include:
Junction temperature display unit,
The working junction temperature for the IGBT module to be tested that the junction temperature display unit is used to determine described control unit
It is shown.
3. a kind of IGBT module working junction temperature on-line detecting system according to claim 1, which is characterized in that the excitation
Unit persistently exports the exciting current to IGBT module to be tested,
Or,
The second control signal that the exciting unit is exported based on described control unit exports the exciting current to be tested
IGBT module.
4. a kind of IGBT module working junction temperature on-line detecting system according to claim, which is characterized in that the control
Unit is based on the saturation voltage drop, determines the working junction temperature of the IGBT module to be tested, comprising:
Based on the corresponding relationship of preset diode (led) module junction temperature and saturation voltage drop, institute corresponding with the saturation voltage drop is determined
State the working junction temperature of IGBT module to be tested.
5. a kind of IGBT module working junction temperature online test method, which is characterized in that be applied to as any one in claim 1-4
IGBT module working junction temperature on-line detecting system described in, including
Based on the first control signal of control unit output, control IGBT module is switched on and off；
The target component of the power topology unit is acquired, the target component includes the input terminal electricity of the power topology unit
Institute is flowed through after pressure, input terminal electric current, the output end voltage of the power topology unit, output end current and injection exciting current
State the saturation voltage drop of freewheeling diode；
Based on the target component, determine the switch state of IGBT module to be detected, when the IGBT module to be tested not
When flowing through main power current, output drive electric current is to IGBT module to be tested and acquisition flows through the saturation of the freewheeling diode
Pressure drop；
Based on the saturation voltage drop, the working junction temperature of the IGBT module to be tested is determined.
6. a kind of IGBT module working junction temperature online test method according to claim 5, which is characterized in that further include:
The working junction temperature for the IGBT module to be tested that described control unit is determined is shown.
7. a kind of IGBT module working junction temperature online test method according to claim 5, which is characterized in that
The exciting current is persistently exported to IGBT module to be tested,
Or,
Based on the second control signal of described control unit output, the exciting current is exported to IGBT module to be tested.
8. a kind of IGBT module working junction temperature online test method according to claim, which is characterized in that described to be based on
The saturation voltage drop determines the working junction temperature of the IGBT module to be tested, comprising:
Based on the corresponding relationship of preset diode (led) module junction temperature and saturation voltage drop, institute corresponding with the saturation voltage drop is determined
State the working junction temperature of IGBT module to be tested.
9. a kind of IGBT module working junction temperature online test method according to claim, which is characterized in that further include:
Control model based on the target component and the current transformer, exports the second control signal.
10. IGBT module working junction temperature online test method according to claim 9, which is characterized in that described to be based on institute
The control model for stating target component and the current transformer exports the second control signal, comprising:
When the switch shape of the preset switches state of IGBT module and the IGBT module to be detected determined in the control model
When state is off state, the second control signal is exported.
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| CN110988641A (en) * | 2019-12-06 | 2020-04-10 | 武汉大学 | IGBT module junction temperature online estimation circuit system and method |
| CN111220891A (en) * | 2020-03-04 | 2020-06-02 | 楚天龙股份有限公司 | IGBT junction temperature measuring method and measuring device |
| CN111707917A (en) * | 2020-06-02 | 2020-09-25 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Junction temperature measuring method of SiC MOSFET |
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| CN115166459A (en) * | 2022-06-28 | 2022-10-11 | 中国第一汽车股份有限公司 | Junction temperature detection device, junction temperature detection method, electronic equipment and storage medium |
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