CN109781293A - The temperature measuring device and measuring circuit and measurement method of more IGBT modules - Google Patents
The temperature measuring device and measuring circuit and measurement method of more IGBT modules Download PDFInfo
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- CN109781293A CN109781293A CN201910101467.8A CN201910101467A CN109781293A CN 109781293 A CN109781293 A CN 109781293A CN 201910101467 A CN201910101467 A CN 201910101467A CN 109781293 A CN109781293 A CN 109781293A
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Abstract
The invention discloses a kind of temperature measuring devices of more IGBT modules comprising n bleeder circuit, bleeder circuit is used to be connected with corresponding NTC resistance, and carries out voltage division processing to NTC resistance, wherein n >=2；N follow circuit, and circuit is followed to be connected with the output end of corresponding bleeder circuit, and for the voltage that bleeder circuit exports to be followed and exported；Screening circuit follows the output end of circuit to be connected with n, and for screening all voltage for following circuit output, and exports minimum voltage Umin；Output processing circuit is connected with the output end of screening circuit, and the minimum voltage Umin for exporting to screening circuit is filtered and follows processing, and output temperature sampled signal；Main control chip is used to receive temperature sampling signal and carries out the temperature sampling signal of output that IGBT module maximum operating temperature is calculated according to the relationship of preset IGBT voltage temperature.
Description
Technical field
The present invention relates to thermometry fields, and in particular to a kind of temperature measuring device and measuring circuit of more IGBT modules
And measurement method.
Background technique
IGBT module is to pass through special process by IGBT (insulated gate bipolar transistor chip) and FWD (freewheeling diode)
Modularized semiconductor product made of encapsulation is widely used in frequency converter, UPS, new-energy automobile driving unit etc. occasion.?
In use, needing the temperature value of implementing monitoring IGBT, it is ensured that IGBT works in safe temperature range.
In order to facilitate measurement temperature, generally included NTC thermistor, producer can be provided built in IGBT inside IGBT module
NTC resistance-temperature characteristic curve, as shown in Figure 1.NTC resistance is handled by sample circuit and is sent to main control chip, and temperature is generally passed through
Degree is tabled look-up or the mode of matched curve obtains the operating temperature of IGBT module.
In applications such as frequency converter, UPS, the feature (single-phase H bridge or three phase full bridge) of circuit topology needs to use multiple
IGBT module such as uses the low voltage frequency converter of three phase full bridge topology, at least needs to use 3 IGBT modules, needs in large capacity
The occasion of IGBT parallel connection, the quantity of IGBT module increase therewith.If the temperature of each IGBT module measures, in program
The a large amount of time is undoubtedly occupied, cpu resource is wasted, especially in the very high control occasion of requirement of real-time, such as motor control
The application such as system, APF harmonic compensation.Also there is the mode for only detecting wherein single IGBT module temperature, such as take three IGBT modules
In, near the module temperature of radiator marginal position (radiating condition is worst), this method defect is it is clear that in each IGBT
When blocks current is unbalanced or when radiating condition changes, the IGBT module temperature of this method measurement can not be represented
The maximum temperature of all IGBT modules.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of measurements of the temperature of more IGBT modules
Device and measuring circuit and measurement method can be monitored each IGBT module, and accurately measure more IGBT modules most
Elevated operating temperature.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of temperature measuring device of more IGBT modules comprising:
N bleeder circuit, the bleeder circuit is used to be connected with corresponding NTC resistance, and carries out at partial pressure to NTC resistance
It manages, wherein n >=2；
N follow circuit, described that circuit is followed to be connected with the output end of corresponding bleeder circuit, and for the partial pressure
The voltage of circuit output is followed and is exported；
Screening circuit, and follows the output end of circuit to be connected described in n, and is used to all following circuit output
Voltage screened, and export minimum voltage Umin；
Output processing circuit is connected with the output end of the screening circuit, for exporting most to the screening circuit
Small voltage Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by output
Temperature sampling signal carries out that IGBT module maximum operating temperature is calculated.
Based on the above technical solution, the screening circuit includes n screening sub-circuit, the screening sub-circuit with
The corresponding output end for following circuit is connected, and the output end of the n screening sub-circuits is connected and exports minimum voltage
Umin。
Based on the above technical solution, the screening sub-circuit includes resistance R4, the first operational amplifier U1 and two
Pole pipe D1, one end of the resistance R4 are connected with the corresponding output end for following circuit, the other end and first operation amplifier
The positive input of device U1 is connected, the negative input phase of the anode of the diode D1 and the first operational amplifier U1
Even, cathode is connected with the output end of the first operational amplifier U1, and the negative input of the n screening sub-circuits is homogeneous
Connect and exports minimum voltage Umin.
Based on the above technical solution, the bleeder circuit include power supply VCC, divider resistance R1, parallel resistance R2,
Filter resistance R3 and filter capacitor C1；The divider resistance R1 is connected after connecting with the parallel resistance R2 with the power supply VCC,
And the parallel resistance R2 is used to be grounded with corresponding NTC resistor coupled in parallel, one end of the filter capacitor C1, the other end with it is described
It is in parallel with the parallel resistance R2 after filter resistance R3 series connection, it is described to follow circuit connection in the filter resistance R3 and filtered electrical
Hold between C1.
Based on the above technical solution, described to follow circuit include second operational amplifier U2, second operation
The positive input of amplifier U2 is connected between the filter resistance R3 and filter capacitor C1, negative input and output end phase
Even.
Based on the above technical solution, the output processing circuit includes resistance R5, filter resistance R6, filter capacitor
One end connects the power supply after C2, third operational amplifier U3, the resistance R5, filter resistance R6 and filter capacitor C2 connect
VCC, other end ground connection, the output end of the screening circuit are connected between the resistance R5 and filter resistance R6, the third
The positive input of operational amplifier U3 is connected between the filter resistance R6 and filter capacitor C2, negative input and output
End is connected, the output end output temperature sampled signal of the third operational amplifier U3.
The present invention also provides a kind of temperature measuring circuits of more IGBT modules comprising:
N IGBT module, each IGBT module include a NTC resistance, wherein n >=2；
N bleeder circuit, the bleeder circuit are connected with corresponding NTC resistance, and for carrying out at partial pressure to NTC resistance
Reason；
N follow circuit, described that circuit is followed to be connected with the output end of corresponding bleeder circuit, and for the partial pressure
The voltage of circuit output is followed and is exported；
Screening circuit, and follows the output end of circuit to be connected described in n, and is used to all following circuit output
Voltage screened, and export minimum voltage Umin；
Output processing circuit is connected with the output end of the screening circuit, for exporting most to the screening circuit
Small voltage Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by output
Temperature sampling signal carries out that IGBT module maximum operating temperature is calculated.
Based on the above technical solution, the bleeder circuit include power supply VCC, divider resistance R1, parallel resistance R2,
Filter resistance R3 and filter capacitor C1；The divider resistance R1 is connected after connecting with the parallel resistance R2 with the power supply VCC,
And the parallel resistance R2 and corresponding NTC resistor coupled in parallel, one end of the filter capacitor C1 are grounded, the other end and the filtering
It is in parallel with the parallel resistance R2 after resistance R3 series connection, it is described to follow circuit connection in the filter resistance R3 and filter capacitor C1
Between.
The method for the temperature measuring device measurement temperature that the present invention also provides a kind of using more IGBT modules described above,
Itself the following steps are included:
The bleeder circuit is connected with corresponding NTC resistance；
The temperature sampling signal of output is calculated according to the relationship of preset IGBT voltage temperature for main control chip
IGBT module maximum operating temperature.
Based on the above technical solution, the bleeder circuit include power supply VCC, divider resistance R1, parallel resistance R2,
Filter resistance R3 and filter capacitor C1；The divider resistance R1 is connected after connecting with the parallel resistance R2 with the power supply VCC,
One end of the filter capacitor C1 is grounded, and the other end is in parallel with the parallel resistance R2 after connecting with the filter resistance R3, institute
It states and follows circuit connection between the filter resistance R3 and filter capacitor C1,
It is described measurement temperature method specifically includes the following steps:
The NTC resistance is in parallel with corresponding parallel resistance R2.
Compared with the prior art, the advantages of the present invention are as follows:
A kind of temperature measuring device of more IGBT modules of the invention, it is corresponding built-in since IGBT module temperature is higher
The resistance value of NTC resistance is smaller, follows the voltage of circuit output minimum, therefore the minimum voltage Umin filtered out corresponds to IGBT module
Maximum operating temperature, output processing circuit receives minimum voltage Umin, and minimum voltage Umin is filtered and is followed processing,
Output temperature sampled signal (being also voltage value, and approximately equal with minimum voltage Umin) simultaneously send the sampling to main control chip logical
Road, main control chip carry out the temperature sampling signal of output that IGBT mould is calculated according to the relationship of preset IGBT voltage temperature
Block maximum operating temperature.Temperature measuring device of the invention can not only be monitored each IGBT module, and accurately measure more
The maximum operating temperature of IGBT module, and structure is simple, it is at low cost, it is not take up software resource.
Detailed description of the invention
Fig. 1 is NTC temperature characteristics figure built in IGBT；
Fig. 2 is a kind of circuit diagram of the temperature measuring circuit of more IGBT modules in the embodiment of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Embodiment 1:
Shown in Figure 2, the embodiment of the present invention 1 provides a kind of temperature measuring device of more IGBT modules, with temperature survey
Amount device is applied to conventional three phase full bridge application and is aided in illustrating, three phase full bridge application, and each bridge arm is 1 corresponding
IGBT module, respectively corresponds the output of A, B, C three-phase, and each IGBT module includes a NTC resistance.The temperature measuring device packet
It includes:
3 bleeder circuits, 3 bleeder circuits respectively correspond 3 NTC resistance, and each bleeder circuit is used for and corresponding NTC
Resistance is connected, and carries out voltage division processing to NTC resistance；
3 follow circuit, and circuit is followed to be connected with the output end of corresponding bleeder circuit, and for exporting to bleeder circuit
Voltage followed and exported；
Screening circuit follows the output end of circuit to be connected with 3, and is used for all electricity for following circuit output
Pressure is screened, and exports minimum voltage Umin；
Output processing circuit is connected with the output end of screening circuit, the minimum voltage for exporting to screening circuit
Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by output
Temperature sampling signal carries out that IGBT module maximum operating temperature is calculated.
The working principle of the temperature measuring device of more IGBT modules of the embodiment of the present invention 1 are as follows: 3 bleeder circuits are right respectively
Corresponding NTC resistance carries out voltage division processing, and the output end connection of each bleeder circuit is corresponding to follow circuit, follows circuit
The voltage of bleeder circuit output is followed and exported, follows the output voltage of circuit to be similar to input voltage, and can be right
Bleeder circuit is in high-impedance state, is in low resistive state to screening circuit, thus plays " isolation " to bleeder circuit and screening circuit and make
With, make to be independent of each other between bleeder circuit and screening circuit, screening circuit receives 3 output ends for following circuit, and by 3 with
It is screened with 3 voltages of circuit output, is exported after filtering out minimum voltage Umin, as shown in Figure 1, IGBT module temperature is got over
The resistance value of height, corresponding built-in NTC resistance is smaller, then follows the voltage of circuit output minimum, therefore the minimum voltage filtered out
Umin corresponds to IGBT module maximum operating temperature, and output processing circuit receives minimum voltage Umin, and to minimum voltage Umin into
Row filtering and follow processing, output temperature sampled signal (being also voltage value, and approximately equal with minimum voltage Umin) and send to
The sampling channel of main control chip, main control chip receive temperature sampling signal and will be defeated according to the relationship of preset IGBT voltage temperature
Temperature sampling signal out carries out that IGBT module maximum operating temperature is calculated.
The temperature measuring device of more IGBT modules in the embodiment of the present invention 1 can not only supervise each IGBT module
It surveys, and accurately measures the maximum operating temperature of more IGBT modules, and structure is simple, it is at low cost, it is not take up software resource.
Shown in Figure 2, in the embodiment of the present invention 1, specifically, screening circuit includes 3 screening sub-circuits, screens son electricity
Road is connected with the corresponding output end for following circuit, and the output end of 3 screening sub-circuits is connected and exports minimum voltage
Umin.3 screening sub-circuits are connected with corresponding output end for following circuit, and reception is corresponding to follow circuit output
Voltage, and three voltage values are screened, are exported after filtering out minimum voltage Umin.
Further, screening sub-circuit includes resistance R4 (A, B, C three-phase are respectively designated as R4a, R4b, R4c), the first fortune
Calculate amplifier U1 (A, B, C three-phase are respectively designated as U1a, U1b, U1c) and diode D1 (A, B, C three-phase be respectively designated as D1a,
D1b, D1c), one end of resistance R4 and the corresponding output end for following circuit are connected, the other end and the first operational amplifier U1's
Positive input is connected, and the anode of diode D1 is connected with the negative input of the first operational amplifier U1, cathode and the first fortune
The output end for calculating amplifier U1 is connected, and the negative input of 3 screening sub-circuits is connected and exports minimum voltage Umin.
The working principle of screening circuit in the embodiment of the present invention 1 are as follows: resistance R4a, R4b, R4c's is defeated in screening sub-circuit
Entering voltage is Ua, Ub, Uc respectively, it is assumed that Ub > Ua > Uc, the voltage of the positive input of the first operational amplifier U1a are Ua, are born
It is Uc to the voltage of input terminal, the voltage of the positive input of the first operational amplifier U1b is Ub, and the voltage of negative input is
Uc, the voltage of the positive input of the first operational amplifier U1c are Uc, and the voltage of negative input is Uc, diode D1a, D1b
By D1c conducting, amplifier U2c is in linear amplification region, and amplifier U2a, U2b is in saturation region, therefore exports minimum voltage Umin
For Uc.
Preferably, bleeder circuit include power supply VCC, divider resistance R1 (A, B, C three-phase be respectively designated as R1a, R1b,
R1c), parallel resistance R2 (A, B, C three-phase are respectively designated as R2a, R2b, R2c), filter resistance R3 (name respectively by A, B, C three-phase
For R3a, R3b, R3c) and filter capacitor C1 (A, B, C three-phase are respectively designated as C1a, C1b, C1c)；Divider resistance R1 with it is in parallel electricity
It is connected after resistance R2 series connection with power supply VCC, and parallel resistance R2 is used for and corresponding NTC resistor coupled in parallel, one end of filter capacitor C1
Ground connection, the other end is in parallel with parallel resistance R2 after connecting with filter resistance R3, follows circuit connection in filter resistance R3 and filtering
Between capacitor C1.Using the embodiment of the present invention 1 more IGBT modules temperature measuring device when, by parallel resistance R2 with it is corresponding
NTC resistor coupled in parallel, simply can accurately measure the maximum operating temperature of IGBT module.
Further, follow circuit include second operational amplifier U2 (A, B, C three-phase be respectively designated as U2a, U2b,
U2c), the positive input of second operational amplifier U2 is connected between filter resistance R3 and filter capacitor C1, negative input
It is connected with output end.For the voltage that bleeder circuit exports to be followed and exported, the output voltage of circuit is followed to be similar to
Input voltage, and can be in high-impedance state to bleeder circuit, it is in low resistive state to screening circuit, thus to bleeder circuit and screening
Circuit plays the role of " being isolated ", makes to be independent of each other between bleeder circuit and screening circuit.
Further, output processing circuit includes resistance R5 (A, B, C three-phase are respectively designated as R5a, R5b, R5c), filtering
Resistance R6 (A, B, C three-phase are respectively designated as R6a, R6b, R6c), filter capacitor C2 (A, B, C three-phase be respectively designated as C2a, C2b,
C2c), third operational amplifier U3 (A, B, C three-phase are respectively designated as U3a, U3b, U3c), resistance R5, filter resistance R6 and filtering
One end connects power supply VCC, other end ground connection after capacitor C2 series connection, and the output end of screening circuit is connected to resistance R5 and filter resistance
Between R6, the positive input of third operational amplifier U3 is connected between filter resistance R6 and filter capacitor C2, negative sense input
End is connected with output end, the output end output temperature sampled signal of third operational amplifier U3.Output processing circuit receives minimum
Voltage Umin, and minimum voltage Umin is filtered and is followed processing, output temperature sampled signal (it is also voltage value, and with
Minimum voltage Umin is approximately equal) and give to the sampling channel of main control chip, main control chip is according to preset IGBT voltage temperature
Relationship carry out the temperature sampling signal of output that IGBT module maximum operating temperature is calculated.
Embodiment 2:
The embodiment of the present invention 2 provides a kind of temperature measuring circuit of more IGBT modules, is applied to three phase full bridge, which surveys
Measuring circuit includes:
3 IGBT modules, each IGBT module include a NTC resistance；
3 bleeder circuits, bleeder circuit are connected with corresponding NTC resistance, and for carrying out voltage division processing to NTC resistance；
3 follow circuit, and circuit is followed to be connected with the output end of corresponding bleeder circuit, and for exporting to bleeder circuit
Voltage followed and exported；
Screening circuit follows the output end of circuit to be connected with 3, and is used for all electricity for following circuit output
Pressure is screened, and exports minimum voltage Umin；
Output processing circuit is connected with the output end of screening circuit, the minimum voltage for exporting to screening circuit
Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by output
Temperature sampling signal carries out that IGBT module maximum operating temperature is calculated.
The working principle of the temperature measuring device of more IGBT modules of the embodiment of the present invention 2 are as follows: 3 bleeder circuits are right respectively
Corresponding NTC resistance carries out voltage division processing, and the output end connection of each bleeder circuit is corresponding to follow circuit, follows circuit
The voltage of bleeder circuit output is followed and exported, follows the output voltage of circuit to be similar to input voltage, and can be right
Bleeder circuit is in high-impedance state, is in low resistive state to screening circuit, thus plays " isolation " to bleeder circuit and screening circuit and make
With, make to be independent of each other between bleeder circuit and screening circuit, screening circuit receives 3 output ends for following circuit, and by 3 with
It is screened with 3 voltages of circuit output, is exported after filtering out minimum voltage Umin, as shown in Figure 1, IGBT module temperature is got over
The resistance value of height, corresponding built-in NTC resistance is smaller, then follows the voltage of circuit output minimum, therefore the minimum voltage filtered out
Umin corresponds to IGBT module maximum operating temperature, and output processing circuit receives minimum voltage Umin, and to minimum voltage Umin into
Row filtering and follow processing, output temperature sampled signal (being also voltage value, and approximately equal with minimum voltage Umin) and send to
The sampling channel of main control chip, main control chip according to the relationship of preset IGBT voltage temperature by the temperature sampling signal of output into
IGBT module maximum operating temperature is calculated in row.
The particular circuit configurations and reality for following circuit, screening circuit and output processing circuit in the embodiment of the present invention 2
Apply identical in example 1, which is not described herein again.
Specifically, bleeder circuit includes power supply VCC, divider resistance R1, parallel resistance R2, filter resistance R3 and filter capacitor
C1；Divider resistance R1 and parallel resistance R2 are connected after connecting with power supply VCC, and parallel resistance R2 and corresponding NTC resistor coupled in parallel,
One end of filter capacitor C1 is grounded, and the other end is in parallel with parallel resistance R2 after connecting with filter resistance R3, follow circuit connection in
Between filter resistance R3 and filter capacitor C1.
Embodiment 3:
The also a kind of temperature measuring device using more IGBT modules as described in embodiment 1 of the embodiment of the present invention 3 measures temperature
The method of degree comprising following steps:
Bleeder circuit is connected with corresponding NTC resistance；
The temperature sampling signal of output is calculated according to the relationship of preset IGBT voltage temperature for main control chip
IGBT module maximum operating temperature.
As shown in Figure 1, IGBT module temperature is higher, and the resistance value of corresponding built-in NTC resistance is smaller, then follows circuit output
Voltage it is minimum, therefore the minimum voltage Umin filtered out correspond to IGBT module maximum operating temperature, output processing circuit reception
Minimum voltage Umin, and minimum voltage Umin is filtered and is followed processing, output temperature sampled signal (it is also voltage value,
And approximately equal with minimum voltage Umin) and give to the sampling channel of main control chip, main control chip is according to preset IGBT voltage
The relationship of temperature carries out the temperature sampling signal of output that IGBT module maximum operating temperature is calculated.
Further, bleeder circuit includes power supply VCC, divider resistance R1, parallel resistance R2, filter resistance R3 and filtered electrical
Hold C1；Divider resistance R1 and parallel resistance R2 are connected after connecting with power supply VCC, one end ground connection of filter capacitor C1, the other end and
It is in parallel with parallel resistance R2 after filter resistance R3 series connection, follow circuit connection between filter resistance R3 and filter capacitor C1,
Measure temperature method specifically includes the following steps:
NTC resistance is in parallel with corresponding parallel resistance R2.
It, only need to be by electricity in parallel when the temperature measuring device of more IGBT modules using the embodiment of the present invention 1 measures temperature
R2 and corresponding NTC resistor coupled in parallel are hindered, the maximum operating temperature of IGBT module simply can be accurately measured.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of temperature measuring device of more IGBT modules, characterized in that it comprises:
N bleeder circuit, the bleeder circuit is used to be connected with corresponding NTC resistance, and carries out voltage division processing to NTC resistance,
Wherein n >=2；
N follow circuit, described that circuit is followed to be connected with the output end of corresponding bleeder circuit, and for the bleeder circuit
The voltage of output is followed and is exported；
Screening circuit, and follows the output end of circuit to be connected described in n, and is used for all electricity for following circuit output
Pressure is screened, and exports minimum voltage Umin；
Output processing circuit is connected with the output end of the screening circuit, the minimum electricity for exporting to the screening circuit
Pressure Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by the temperature of output
Sampled signal carries out that IGBT module maximum operating temperature is calculated.
2. the temperature measuring device of more IGBT modules as described in claim 1, which is characterized in that the screening circuit includes n
A screening sub-circuit, the screening sub-circuit are connected with the corresponding output end for following circuit, and a screening sub-circuit of n
Output end is connected and exports minimum voltage Umin.
3. the temperature measuring device of more IGBT modules as claimed in claim 2, which is characterized in that the screening sub-circuit includes
Resistance R4, the first operational amplifier U1 and diode D1, one end of the resistance R4 and the corresponding output end phase for following circuit
Even, the other end is connected with the positive input of the first operational amplifier U1, the anode of the diode D1 and described first
The negative input of operational amplifier U1 is connected, and cathode is connected with the output end of the first operational amplifier U1, and n described
The negative input for screening sub-circuit is connected and exports minimum voltage Umin.
4. the temperature measuring device of more IGBT modules as described in claim 1, which is characterized in that the bleeder circuit includes electricity
Source VCC, divider resistance R1, parallel resistance R2, filter resistance R3 and filter capacitor C1；The divider resistance R1 with it is described it is in parallel electricity
It is connected after resistance R2 series connection with the power supply VCC, and the parallel resistance R2 is used for and corresponding NTC resistor coupled in parallel, the filtering
One end of capacitor C1 is grounded, and the other end is in parallel with the parallel resistance R2 after connecting with the filter resistance R3, described to follow electricity
Road is connected between the filter resistance R3 and filter capacitor C1.
5. the temperature measuring device of more IGBT modules as claimed in claim 4, which is characterized in that described to follow circuit include the
Two operational amplifier U2, the positive input of the second operational amplifier U2 are connected to the filter resistance R3 and filter capacitor
Between C1, negative input is connected with output end.
6. the temperature measuring device of more IGBT modules as claimed in claim 4, which is characterized in that the output processing circuit packet
Include resistance R5, filter resistance R6, filter capacitor C2, third operational amplifier U3, the resistance R5, filter resistance R6 and filtered electrical
One end connects the power supply VCC, other end ground connection after holding C2 series connection, and the output end of the screening circuit is connected to the resistance R5
Between filter resistance R6, the positive input of the third operational amplifier U3 is connected to the filter resistance R6 and filtered electrical
Hold between C2, negative input is connected with output end, the output end output temperature sampled signal of the third operational amplifier U3.
7. a kind of temperature measuring circuit of more IGBT modules, characterized in that it comprises:
N IGBT module, each IGBT module include a NTC resistance, wherein n >=2；
N bleeder circuit, the bleeder circuit are connected with corresponding NTC resistance, and for carrying out voltage division processing to NTC resistance；
N follow circuit, described that circuit is followed to be connected with the output end of corresponding bleeder circuit, and for the bleeder circuit
The voltage of output is followed and is exported；
Screening circuit, and follows the output end of circuit to be connected described in n, and is used for all electricity for following circuit output
Pressure is screened, and exports minimum voltage Umin；
Output processing circuit is connected with the output end of the screening circuit, the minimum electricity for exporting to the screening circuit
Pressure Umin is filtered and follows processing, and output temperature sampled signal；
Main control chip is used to receive temperature sampling signal and according to the relationship of preset IGBT voltage temperature by the temperature of output
Sampled signal carries out that IGBT module maximum operating temperature is calculated.
8. the temperature measuring circuit of more IGBT modules as claimed in claim 7, which is characterized in that the bleeder circuit includes electricity
Source VCC, divider resistance R1, parallel resistance R2, filter resistance R3 and filter capacitor C1；The divider resistance R1 with it is described it is in parallel electricity
It is connected after resistance R2 series connection with the power supply VCC, and the parallel resistance R2 and corresponding NTC resistor coupled in parallel, the filter capacitor
One end of C1 is grounded, and the other end is in parallel with the parallel resistance R2 after connecting with the filter resistance R3, described that circuit is followed to connect
It is connected between the filter resistance R3 and filter capacitor C1.
9. a kind of method of the temperature measuring device measurement temperature using more IGBT modules as described in claim 1, feature
It is comprising following steps:
The bleeder circuit is connected with corresponding NTC resistance；
Main control chip carries out the temperature sampling signal of output that IGBT is calculated according to the relationship of preset IGBT voltage temperature
Module maximum operating temperature.
10. the method for the measurement temperature of more IGBT modules as claimed in claim 9, which is characterized in that the bleeder circuit packet
Include power supply VCC, divider resistance R1, parallel resistance R2, filter resistance R3 and filter capacitor C1；The divider resistance R1 and it is described simultaneously
It is connected after connection resistance R2 series connection with the power supply VCC, one end of the filter capacitor C1 is grounded, the other end and the filter resistance
R3 series connection after it is in parallel with the parallel resistance R2, it is described follow circuit connection in the filter resistance R3 and filter capacitor C1 it
Between,
It is described measurement temperature method specifically includes the following steps:
The NTC resistance is in parallel with corresponding parallel resistance R2.
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| CN110412447A (en) * | 2019-07-26 | 2019-11-05 | 北京工业大学 | A kind of method of highest chip temperature and minimum chip temperature in nondestructive measurement IGBT module parallel chip |
| CN111174932A (en) * | 2020-01-07 | 2020-05-19 | 上海电气集团股份有限公司 | Temperature sampling detection system and method for multiple parallel IGBT modules |
| CN111999629A (en) * | 2020-08-24 | 2020-11-27 | 阳光电源股份有限公司 | IGBT module state monitoring method and device |
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