CN211262519U - Temperature detection and over-temperature protection device with thermistor IGBT module - Google Patents
Temperature detection and over-temperature protection device with thermistor IGBT module Download PDFInfo
- Publication number
- CN211262519U CN211262519U CN202020029683.4U CN202020029683U CN211262519U CN 211262519 U CN211262519 U CN 211262519U CN 202020029683 U CN202020029683 U CN 202020029683U CN 211262519 U CN211262519 U CN 211262519U
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- voltage
- voltage comparator
- controller
- thermistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Power Conversion In General (AREA)
Abstract
The utility model provides a take temperature detection and excess temperature protection device of thermistor IGBT module. The temperature detection device comprises a sampling resistor, a parallel signal acquisition unit, a controller and K voltage comparators; one end of the sampling resistor is electrically connected with the other end of the thermistor, and the other end of the sampling resistor is grounded; one input end of each voltage comparator is electrically connected with each other and is electrically connected with the first reference voltage end, and one input end of each voltage comparator is a non-inverting input end or an inverting input end; one end of the sampling resistor is electrically connected with the other input end of the 1 st voltage comparator, the other input end of the ith voltage comparator is electrically connected with the other input end of the (i + 1) th voltage comparator through a resistor, and the other input end of the Kth voltage comparator is grounded through a resistor; the output ends of the K voltage comparators are respectively and correspondingly electrically connected with different parallel input ends of the parallel signal acquisition unit, and the output end of the parallel signal acquisition unit is electrically connected with the input end of the controller.
Description
Technical Field
The utility model relates to a temperature-detecting device especially relates to a take temperature-detecting device of thermistor IGBT module.
Background
Insulated Gate Bipolar Transistors (IGBTs) are a widely used power semiconductor device. The IGBT module often fails due to excessive temperature, which seriously affects its service life and thus the reliability of the system in which it is located.
At present, for junction temperature detection of an IGBT module with a thermistor, a relational expression between a resistance value of the thermistor and an ambient temperature of the thermistor is required, and the junction temperature of the IGBT module is obtained by measuring the obtained resistance value of the thermistor. However, the resistance value of the thermistor and the temperature are in a logarithmic relationship, and the junction temperature of the IGBT module obtained by the resistance value of the thermistor needs to be subjected to more complicated mathematical operations, so that the calculation capability requirement on a processor in the temperature measurement device is higher, and the device has high cost and large power consumption.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to taking the high problem of treater computing power requirement among the junction temperature detection device of thermistor IGBT module, provide a take temperature-detecting device of thermistor IGBT module.
In order to solve the technical problem, the utility model discloses a technical scheme is: one end of a thermistor RT is electrically connected with a first power supply end;
the temperature detection device comprises a sampling resistor Rs, a parallel signal acquisition unit, a controller and K voltage comparators, wherein K is more than or equal to 2;
one end of the sampling resistor Rs is electrically connected with the other end of the thermistor RT, and the other end of the sampling resistor Rs is grounded;
one input end of each voltage comparator is electrically connected with each other and is electrically connected with the first reference voltage end Vr1, and one input end of each voltage comparator is a non-inverting input end or an inverting input end;
one end of the sampling resistor Rs is connected with the 1 st voltage comparator A1Is electrically connected to the other input terminal of the ith voltage comparator AiAnd the (i + 1) th voltage comparator Ai+1Across a resistor R between the other input terminalsiI is more than or equal to 1 and less than or equal to K-1, and the Kth voltage comparator AKIs passed through a resistor RKGround, resistance R1、R2、……、RKAre connected in series;
the output ends of the K voltage comparators are respectively and correspondingly electrically connected with different parallel input ends of the parallel signal acquisition unit, and the output end of the parallel signal acquisition unit is electrically connected with the input end of the controller.
The utility model discloses in, when the junction temperature of IGBT module is different, thermistor RT's resistance value also can correspond there is different value for the voltage value of sampling resistor Rs one end (the thermistor RT other end promptly) corresponds different values.K resistors R connected in series1、R2、……、RKThe voltage of one end (namely the other end of the thermistor RT) of the sampling resistor Rs is divided to obtain the voltage value of the other input end of the K voltage comparators, one input end of the K voltage comparators is electrically connected with the same first reference voltage end Vr1, and after the voltages of the two input ends of each voltage comparator are compared, the high level or the low level is output. And the output values of the K voltage comparators are acquired by the parallel signal acquisition unit and are transmitted to the controller. By collecting the output levels of the K voltage comparators, the voltage range of the voltage value at one end of the sampling resistor can be determined, namely the voltage ranges at two ends of the thermistor can be determined, so that the resistance range of the thermistor can be determined, and the junction temperature range of the IGBT module can be obtained. By arranging a plurality of voltage comparators, a plurality of temperature ranges from high to low can be detected, so that more accurate junction temperature information of the IGBT module can be obtained. The utility model discloses in, do not calculate accurate temperature value through complicated logarithm relational expression, but directly obtain the scope of temperature, low to the requirement of controller, the low power dissipation in the working process.
Furthermore, the parallel signal acquisition unit is a converter for converting a parallel input signal into a serial output signal, and a serial output end of the parallel signal acquisition unit is electrically connected with a serial input end of the controller;
or the parallel signal acquisition unit is integrated in the controller, the controller is provided with at least K parallel input ends, and the K parallel input ends of the controller are respectively and correspondingly electrically connected with the output ends of the K voltage comparators.
The utility model discloses in, utilize parallel input/serial output's converter to gather the output signal of voltage comparator and convert serial output result into, convey again for the controller, can save the hardware resources of controller.
Further, the converter is a shift register.
Further, one end of the sampling resistor Rs is connected with the 1 st voltage comparator A1Is electrically connected with the other input terminal through a filter circuit.
Further, the filter circuit is connected with the 1 st voltage comparator A1Is electrically connected with the other input terminal through a voltage follower.
By providing a voltage follower, the load carrying capability of the device can be enhanced.
Further, the output terminals of the K voltage comparators are electrically connected with the second power supply terminal Vc2 through pull-up resistors Ru, and the power supply of the first power supply terminal Vc1 and the power supply of the second power supply terminal Vc2 are a common ground power supply or the same power supply.
Further, the controller is a single chip microcomputer, a DSP or an FPGA.
The utility model also provides a take excess temperature protection device of thermistor IGBT module, including above-mentioned arbitrary temperature-detecting device, the controller passes through the converter and is connected with the cooling fan the control unit electricity of IGBT module.
The utility model discloses in, through setting up converter, cooling fan the control unit to can utilize the singlechip to pass through converter control cooling fan the control unit when IGBT module junction temperature is in different scopes, make cooling fan be in different power, thereby can make cooling fan work realize rapid cooling's effect under high-power when the temperature is high, and when the temperature is lower, can adopt less power, realize energy-conservation.
Furthermore, one input end of the voltage comparator is a non-inverting input end, the over-temperature protection device further comprises an and gate circuit, one input end of the and gate circuit is correspondingly and electrically connected with the signal control end of the controller, and the output end of the and gate circuit is electrically connected with the driving end of the IGBT module;
when the thermistor RT is a negative temperature coefficient resistor, the other input end of the gate circuit is connected with a Kth voltage comparator AKThe output ends of the two-way valve are electrically connected;
when the thermistor RT is a positive temperature coefficient resistor, the other input end of the gate circuit (50) is connected with the 1 st voltage comparator A1The output terminals of the first and second switches are electrically connected.
If the thermistor has negative temperature coefficientResistance, if the Kth voltage comparator AKThe output of low level indicates that the Kth voltage comparator A is enabled after voltage division of K resistorsKThe voltage value of the inverting input end of the first sampling resistor Rs is larger than the voltage value of the first reference voltage end Vr1, which indicates that the voltage value of one end of the first sampling resistor Rs is higher than a certain voltage value, that is, the resistance value of the thermistor RT is smaller than a certain resistance value, that is, the junction temperature of the IGBT module is higher than the maximum temperature value which can be detected by the device, the output of the and gate circuit is necessarily low level through the and gate circuit, and the IGBT module can be stopped to work by using the driving end of the IGBT module, so that safety is ensured. The principle can be analogized when the thermistor is a positive temperature coefficient resistor.
The utility model has the advantages and positive effects that: the controller in the temperature detection device of the utility model does not need to collect the analog quantity of the temperature signal in real time and does not need to operate complicated operations such as exponential function, thereby reducing the task quantity of the controller and improving the reliability of the controller; meanwhile, the controller does not need to adopt a high-level processor, and only a common single chip microcomputer is adopted, so that the hardware cost of the controller is saved. The utility model discloses an among the excess temperature protection device, the output power size of temperature range decision converter that can pass through the IGBT module can practice thrift the electric energy like this and can improve cooling fan's life-span.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic diagram of an overall circuit structure of a temperature detection device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the circuit connection between the filter module and the voltage follower of the temperature detection device according to the embodiment of the present invention and the thermistor and the sampling resistor in the IGBT module;
fig. 3 is a schematic diagram of the circuit connection of the series resistance unit, the voltage comparison unit and the controller of the temperature detection device according to the embodiment of the present invention;
fig. 4 is a schematic diagram of the circuit connection of fig. 3 when K-8;
fig. 5 is a schematic circuit connection diagram of the controller, the and gate circuit, the frequency converter, and the cooling fan control unit of the over-temperature protection device according to the embodiment of the present invention.
In the figure, the device comprises a controller 10, a controller 20, a parallel signal acquisition unit 30, a frequency converter 40, a cooling fan control unit 50, a gate circuit 60, a voltage follower 70, a filter circuit 80, a series resistance unit 90 and a voltage comparison unit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1-4, the utility model provides a take temperature-detecting device of thermistor IGBT module. The temperature detection device comprises a controller 10, a parallel signal acquisition unit 20, a voltage follower 60, a filter circuit 70, a series resistance unit 80 and a voltage comparison unit 90.
The end M1 in FIG. 2 is the same end as the end M1 in FIG. 3. The M2 and M3 terminals in FIG. 3 are the same as the M2 and M3 terminals in FIG. 5, respectively. The end M4 in fig. 5 is the driving end of the IGBT module.
One end and the other end of a thermistor RT of the IGBT module are respectively and correspondingly electrically connected with a first power supply end Vc1 and one end of a sampling resistor Rs, and the other end of the sampling resistor Rs is grounded.
The resistor RT is a thermistor in the IGBT, the resistor Rs is a sampling resistor connected with the thermistor in series, and the resistor RT and the resistor Rs are connected with the first power supply end Vc1 after being connected in series. The first power source terminal Vc1 may use a 3.3V power source. In order to improve the sampling accuracy, the first power supply terminal Vc1 may be powered by a linear power supply or a standard reference power supply.
The resistance of the sampling resistor Rs can be set according to the lowest temperature value desired to be detected, the resistance of the thermistor RT at the lowest temperature value, the voltage value of the first reference voltage terminal Vr1, and the voltage value of the first voltage terminal Vc 1.
In this embodiment, the lowest detectable temperature may be set to 85 ℃, and the voltage value of the first reference voltage terminal Vr1 may be set to 2.048V. To ensure that the output voltage of the voltage follower 60 can be greater than 2.048V at 85 ℃, the resistance Rs can be set to 1197.2 Ω.
The filter circuit 70 may employ a low pass filter circuit. The filter circuit 70 includes a filter resistor Rc1 and a filter capacitor C1. One end of the filter resistor Rc1 is electrically connected to one end of the sampling resistor Rs. The other end of the filter resistor Rc1, one end of the filter capacitor C1 and the non-inverting input end of the voltage follower 60 are electrically connected. The other end of the filter capacitor C1 is grounded. The inverting input of the voltage follower 60 is electrically connected to its output. The resistor Rc1 and the capacitor C1 form a low-pass filter, which is mainly used for filtering out high-frequency interference conducted or radiated by the outside, and since the temperature sampling signal is a direct-current voltage, the cut-off frequency of the low-pass filter is 40Hz, and Rc1 is 10K Ω and C1 is 400000 pF.
The voltage follower 60 composed of operational amplifier mainly plays a role of enhancing the load capacity, and the load of the output of the voltage follower 60 is the total resistance of the series-connected resistors in the series-connected resistor unit 80.
The series resistance unit 80 includes resistors R connected in series with each other1、R2、……、RK. The voltage comparing unit 90 includes K voltage comparators, K ≧ 2. Each voltage comparator is an open collector output comparator. The resistance value of each resistor in the series resistor unit 80 can be set according to the lowest temperature value desired to be detected, the highest temperature value, the temperature range desired to be detected, the resistance value of the thermistor RT at the temperature values, the voltage value of the first reference voltage terminal Vr1, and the voltage value of the first voltage terminal Vc 1.
The non-inverting input terminals of each voltage comparator are electrically connected with each other and are electrically connected with the first reference voltage terminal Vr 1.
The output of the voltage follower 60 and the 1 st voltage comparator A1Is electrically connected to the i-th voltage comparator AiAnd the (i + 1) th voltage comparator Ai+1Between the inverting input terminals of the two-phase inverter circuit through a resistor RiI is more than or equal to 1 and less than or equal to 7, and the 8 th voltage comparator A8Is connected to the inverting input terminal through a resistor R8Ground, resistance R1、R2、……、R8Are connected in series with each other.
The output ends of the K voltage comparators are respectively and correspondingly electrically connected with different parallel input ends of the parallel signal acquisition unit 20, and the output end of the parallel signal acquisition unit 20 is electrically connected with the input end of the controller 10.
TABLE 1
| Temp.(℃) | Rtyp(kΩ) | Rmin(kΩ) | Rmax(kΩ) | B value(K) |
| -40 | 99.09 | 84.46 | 116.0 | 3194 |
| -35 | 75.17 | 64.46 | 87.44 | 3207 |
| -30 | 57.54 | 49.63 | 66.55 | 3220 |
| -25 | 44.44 | 38.54 | 51.10 | 3233 |
| -20 | 34.60 | 30.18 | 39.58 | 3245 |
| -15 | 27.16 | 23.81 | 30.91 | 3256 |
| -10 | 21.48 | 18.92 | 24.32 | 3268 |
| -5 | 17.11 | 15.14 | 19.28 | 3279 |
| 0 | 13.72 | 12.20 | 15.39 | 3288 |
| 5 | 11.08 | 9.895 | 12.37 | 3299 |
| 10 | 9.001 | 8.074 | 10.01 | 3309 |
| 15 | 7.357 | 6.627 | 8.147 | 3318 |
| 20 | 6.048 | 5.470 | 6.671 | 3326 |
| 25 | 5.000 | 4.539 | 5.494 | - |
| 30 | 4.156 | 3.787 | 4.549 | 3342 |
| 35 | 3.472 | 3.175 | 3.786 | 3351 |
| 40 | 2.914 | 2.675 | 3.168 | 3361 |
| 45 | 2.458 | 2.264 | 2.663 | 3368 |
| 50 | 2.083 | 1.924 | 2.249 | 3375 |
| 55 | 1.773 | 1.643 | 1.908 | 3381 |
| 60 | 1.515 | 1.408 | 1.625 | 3389 |
| 65 | 1.300 | 1.212 | 1.391 | 3395 |
| 70 | 1.120 | 1.047 | 1.194 | 3402 |
| 75 | 0.9683 | 0.9082 | 1.030 | 3408 |
| 80 | 0.8404 | 0.7903 | 0.8914 | 3414 |
| 85 | 0.7319 | 0.6902 | 0.7743 | 3420 |
| 90 | 0.6397 | 0.6047 | 0.6749 | 3425 |
| 95 | 0.5608 | 0.5316 | 0.5903 | 3431 |
| 100 | 0.4933 | 0.4687 | 0.5179 | 3436 |
| 105 | 0.4352 | 0.4125 | 0.4580 | 3441 |
| 110 | 0.3851 | 0.3642 | 0.4063 | 3446 |
| 115 | 0.3418 | 0.3225 | 0.3614 | 3450 |
| 120 | 0.3042 | 0.2864 | 0.3223 | 3454 |
| 125 | 0.2714 | 0.2550 | 0.2882 | 3459 |
| 130 | 0.2428 | 0.2277 | 0.2584 | 3463 |
| 135 | 0.2178 | 0.2038 | 0.2323 | 3467 |
| 140 | 0.1959 | 0.1829 | 0.2093 | 3470 |
| 145 | 0.1765 | 0.1645 | 0.1890 | 3474 |
| 150 | 0.1595 | 0.1483 | 0.1711 | 3477 |
Here, K is 8 as an example.
The temperature value is desired to be detected as 8 values, and the temperature range is desired to be detected as 9 grades: the first grade is below 85 ℃, the second grade is 85-90 ℃, the third grade is 90-95 ℃, the fourth grade is 95-100 ℃, the fifth grade is 100-105 ℃, the sixth grade is 105-110 ℃, the seventh grade is 110-115 ℃, the eighth grade is 115-120 ℃, and the ninth grade is above 120 ℃.
Table 1 shows the resistance values of the thermistor at different temperatures. The resistance values of the thermistor at 85 deg.C, 90 deg.C, 95 deg.C, 100 deg.C, 105 deg.C, 110 deg.C, 115 deg.C and 120 deg.C are 0.7319K Ω, 0.6397K Ω, 0.5608K Ω, 0.4933K Ω, 0.4352K Ω, 0.3851K Ω, 0.3418K Ω and 0.3042K Ω, respectively, as can be seen from the table 1.
By calculation, R1＝1K、R2＝856Ω、R3＝732Ω、R4＝630Ω、R5＝544Ω、R6＝469Ω、R7＝408Ω、R8＝16.2889KΩ。
The output ends of the 8 voltage comparators can be electrically connected with the second power supply end Vc2 through pull-up resistors Ru, and the power supply of the first power supply end Vc1 and the power supply of the second power supply end Vc2 are common-ground power supplies or the same power supply. The voltage of the second power source terminal Vc2 may be 3.3V. The second power supply terminal Vc2 may be powered by a high-precision reference power supply, a linear power supply, or a switching power supply. The pull-up resistor Ru may have a resistance of 4.7K ohms.
The parallel signal acquisition unit 20 is a converter for converting a parallel input signal into a serial output signal, and a serial output end of the parallel signal acquisition unit 20 is electrically connected with a serial input end of the controller 10;
or the parallel signal acquisition unit 20 is integrated in the controller 10, the controller 10 has at least 8 parallel input terminals, and the 8 parallel input terminals of the controller 10 are respectively and correspondingly electrically connected with the output terminals of the 8 voltage comparators.
The parallel signal acquisition unit 20 is preferably a shift register. The parallel signal acquisition unit 20 may adopt an 8-bit parallel input/serial output shift register, where 8-bit data inputs of the shift register are outputs of 8 voltage comparators, and an output of the shift register is connected to an I/O port of the controller 10, so that output states of the 8 voltage comparators can be sampled only by one I/O port of the controller.
The controller 10 is a single chip microcomputer, a DSP or an FPGA. The thermistor RT is a negative temperature coefficient resistor or a positive temperature coefficient resistor. The voltage comparator is model LM2901 DR. The model number of the shift register is 74HC 166D. The and circuit 50 is of the type 74HCT1G08 GV.
The controller 10 may be connected to a display unit to display the output result of the voltage comparator, or convert the output result of the voltage comparator into a corresponding temperature range to display the temperature range in the display unit. Those skilled in the art will understand how to implement this.
As shown in fig. 1-5, the utility model also provides a take excess temperature protection device of thermistor IGBT module, including above-mentioned temperature-detecting device, controller 10 is connected through converter 30 and the cooling fan control unit 40 electricity of IGBT module.
One input end of the voltage comparator is a non-inverting input end, the over-temperature protection device further comprises an and-gate circuit 50, one input end of the and-gate circuit 50 is correspondingly and electrically connected with the signal control end of the controller 10, and the output end of the and-gate circuit 50 is electrically connected with the driving end of the IGBT module;
when the thermistor RT is a negative temperature coefficient resistor, the other input end of the gate circuit 50 is connected to the Kth voltage comparator AKThe output ends of the two-way valve are electrically connected;
when the thermistor RT is a positive temperature coefficient resistor, the other input end of the gate circuit 50 is connected with the 1 st voltage comparator A1The output terminals of the first and second switches are electrically connected.
The controller 10 controls the output power of the frequency converter according to the magnitude of the sampled IGBT internal junction temperature (reflected by the digital quantity output by the voltage comparator), and finally controls the air volume of the cooling fan.
When the 8 voltage comparators all output high levels, the temperature value of the thermistor inside the IGBT is lower than 85 ℃ at the moment, the junction temperature of the IGBT is very low, and the MCU sends a command to the frequency converter through the RS485 bus at the moment, so that the frequency converter can be informed of not needing to start a cooling fan;
when voltage comparator A1At a low level, the voltage comparator A2-A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 85 ℃ and lower than 90 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the heat dissipation fan according to 1/8 rated power;
when voltage comparator A1～A2At a low level, the voltage comparator A3～A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 90 ℃ and lower than 95 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the heat dissipation fan according to 2/8 rated power;
when voltage comparator A1～A3At a low level, the voltage comparator A4～A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 95 ℃ and lower than 100 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the heat dissipation fan according to 3/8 rated power;
when voltage comparator A1～A4At low level, the voltage comparator A5～A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 100 ℃ and lower than 105 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the heat dissipation fan according to 4/8 rated power;
when voltage comparator A1～A5At low level, the voltage comparator A6～A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 105 ℃ and lower than 110 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the cooling fan according to 5/8 rated power;
when voltage comparator A1～A6At low level, the voltage comparator A7～A8When the voltage is high level, the temperature value of the thermistor in the IGBT is higher than 110 ℃ and lower than 115 ℃, and the MCU passes through the RS485 busSending a command to the frequency converter, and informing the frequency converter to start the cooling fan according to 6/8 rated power;
when voltage comparator A1～A7At low level, the voltage comparator A8When the current level is high, the temperature value of the thermistor in the IGBT is higher than 115 ℃ and lower than 120 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, and the frequency converter can be informed to start the heat dissipation fan according to 7/8 rated power;
when voltage comparator A1～A8When the voltage is low level, the temperature value of the thermistor in the IGBT is larger than 120 ℃, the MCU sends a command to the frequency converter through the RS485 bus at the moment, the frequency converter can be informed to start the cooling fan according to the rated power, and the voltage comparator A8The output low level directly blocks the drive pulse of the IGBT, and the IGBT stops working.
The connection of controller, converter, cooling fan control unit, cooling fan, thereby the controller output different signals controls cooling fan control unit through the converter, all is prior art, and the skilled person in the art can understand.
In this embodiment, carry out low pass filtering with the voltage at sampling resistor both ends, then connect the output of wave filter to the input of voltage follower, 8 series resistance are connected to the output of voltage follower, utilize resistance voltage division principle, and 8 comparator inverting input end sample resistance's one end is for the voltage of GND in proper order, and the noninverting input end is all reference voltage 2.048V. The IGBT module temperature detection device of this embodiment divides the IGBT internal junction temperature signal into 9 grades according to the actual application, the grades are 85 ℃ or lower, 85 to 90 ℃, 90 to 95 ℃, 95 to 100 ℃, 100 to 105 ℃, 105 to 110 ℃, 110 to 115 ℃, 115 to 120 ℃, and 120 ℃ or higher, and a parallel input/serial output shift register chip is adopted, and the controller 10 can acquire a plurality of level signals reflecting signals in each temperature interval only by one I/O port. The controller only needs to collect the state quantity of the I/O port, does not need to collect the analog quantity of the temperature signal in real time, and does not need to operate a complicated similar R in an internal processing unit2＝R25*exp*[B25/80*(1/T2-1/(29815))]The operation of the equal exponential function reduces the task load of the controller 10 and improves the reliability of the controller; meanwhile, the controller does not need to adopt a high-level processor, and only a common single chip microcomputer can be adopted, so that the hardware cost of the controller is saved. In the conventional mode, once the IGBT module works, no matter the output power of the IGBT module and the internal junction temperature of the IGBT, a heat radiation fan in the IGBT module runs according to rated power. In the over-temperature protection device, the output power of the frequency converter is determined by the junction temperature inside the IGBT, so that the electric energy can be saved, and the service life of the cooling fan can be prolonged.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading the present invention, modifications of various equivalent forms of the invention by those skilled in the art will fall within the scope of the appended claims. In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
Claims (9)
1. The utility model provides a take temperature-detecting device of thermistor IGBT module, thermistor RT one end is connected with first power end Vc1 electricity, its characterized in that:
the temperature detection device comprises a sampling resistor Rs, a parallel signal acquisition unit (20), a controller (10) and K voltage comparators, wherein K is more than or equal to 2;
one end of the sampling resistor Rs is electrically connected with the other end of the thermistor RT, and the other end of the sampling resistor Rs is grounded;
one input end of each voltage comparator is electrically connected with each other and is electrically connected with the first reference voltage end Vr1, and one input end of each voltage comparator is a non-inverting input end or an inverting input end;
one end of the sampling resistor Rs is connected with the 1 st voltage comparator A1Is electrically connected to the other input terminal of the ith voltage comparator AiAnd the (i + 1) th voltage comparator Ai+1Across a resistor R between the other input terminalsiI is more than or equal to 1 and less than or equal to K-1, and the Kth voltage comparator AKIs passed through a resistor RKGround, resistance R1、R2、……、RKAre connected in series;
the output ends of the K voltage comparators are respectively and correspondingly electrically connected with different parallel input ends of the parallel signal acquisition unit (20), and the output end of the parallel signal acquisition unit (20) is electrically connected with the input end of the controller (10).
2. The temperature detection device according to claim 1, characterized in that: the parallel signal acquisition unit (20) is a converter for converting a parallel input signal into a serial output signal, and the serial output end of the parallel signal acquisition unit (20) is electrically connected with the serial input end of the controller (10);
or the parallel signal acquisition unit (20) is integrated in the controller (10), the controller (10) is provided with at least K parallel input ends, and the K parallel input ends of the controller (10) are respectively and correspondingly and electrically connected with the output ends of the K voltage comparators.
3. The temperature detection device according to claim 2, characterized in that: the parallel signal acquisition unit (20) is a shift register.
4. The temperature detection device according to claim 1, characterized in that: one end of the sampling resistor Rs is connected with the 1 st voltage comparator A1Is electrically connected to the other input terminal via a filter circuit (70).
5. The temperature detection device according to claim 4, characterized in that: the above-mentionedA filter circuit (70) and a 1 st voltage comparator A1Is electrically connected through a voltage follower (60).
6. The temperature detection device according to any one of claims 1 to 5, characterized in that: the output ends of the K voltage comparators are electrically connected with the second power supply end Vc2 through pull-up resistors Ru, and the power supply of the first power supply end Vc1 and the power supply of the second power supply end Vc2 are common-ground power supplies or the same power supply.
7. The temperature detection device according to any one of claims 1 to 5, characterized in that: the controller (10) is a single chip microcomputer, a DSP or an FPGA.
8. The utility model provides a take excess temperature protection device of thermistor IGBT module which characterized in that: comprising a temperature detection device according to any of claims 1-7, the controller (10) being electrically connected to a cooling fan control unit (40) of the IGBT module via a frequency converter (30).
9. An over-temperature protection device according to claim 8, wherein: one input end of the voltage comparator is a non-inverting input end, the over-temperature protection device further comprises an AND gate circuit (50), one input end of the AND gate circuit (50) is correspondingly and electrically connected with a signal control end of the controller (10), and the output end of the AND gate circuit (50) is electrically connected with a driving end of the IGBT module;
when the thermistor RT is a negative temperature coefficient resistor, the other input end of the gate circuit (50) is connected with a Kth voltage comparator AKThe output ends of the two-way valve are electrically connected;
when the thermistor RT is a positive temperature coefficient resistor, the other input end of the gate circuit (50) is connected with the 1 st voltage comparator A1The output terminals of the first and second switches are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020029683.4U CN211262519U (en) | 2020-01-08 | 2020-01-08 | Temperature detection and over-temperature protection device with thermistor IGBT module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020029683.4U CN211262519U (en) | 2020-01-08 | 2020-01-08 | Temperature detection and over-temperature protection device with thermistor IGBT module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211262519U true CN211262519U (en) | 2020-08-14 |
Family
ID=71953445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020029683.4U Active CN211262519U (en) | 2020-01-08 | 2020-01-08 | Temperature detection and over-temperature protection device with thermistor IGBT module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211262519U (en) |
-
2020
- 2020-01-08 CN CN202020029683.4U patent/CN211262519U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109556752B (en) | Temperature acquisition circuit and car | |
| CN104682690A (en) | Estimation method and device of effective value of alternating-current voltage of power supply device | |
| US20220214388A1 (en) | Insulation detection circuit for voltage balance | |
| CN111722069B (en) | Insulation detection circuit sampling resistor selection method, device, medium and equipment | |
| CN211262519U (en) | Temperature detection and over-temperature protection device with thermistor IGBT module | |
| CN208689109U (en) | Multifunctional brake resistance detecting circuit and its frequency converter | |
| CN208000364U (en) | Motor gear identification device | |
| CN211291788U (en) | IGBT module temperature measuring circuit | |
| CN114019242A (en) | Method and device for detecting insulation impedance of direct current side of photovoltaic inverter | |
| WO2024060622A1 (en) | Controller and control system for frequency converter, and electrical device | |
| CN110932728B (en) | Analog-to-digital conversion device | |
| CN218493857U (en) | Automatic speed regulation control system of fan | |
| CN115561609A (en) | Temperature sampling method, device and system applied to SiC power device | |
| CN213843362U (en) | Device for solving high-precision current sampling of high-power-density and large-current electronic load | |
| CN209372257U (en) | A kind of temperature sampling circuit, wiring board, electric machine controller and electric car | |
| CN1317802C (en) | Extensible cell state monitoring circuit for cell managing system | |
| CN204575214U (en) | A kind of maximum temperature sample circuit | |
| CN219328879U (en) | Energy consumption type electronic load module and test system | |
| WO2019097235A2 (en) | Method and apparatus | |
| CN214893744U (en) | Temperature acquisition circuit capable of realizing wide-range high precision | |
| CN203732615U (en) | Terminal voltage measuring instrument of AC variable frequency motor | |
| CN210863978U (en) | Battery testing device | |
| CN220381196U (en) | Voltage acquisition circuit, system and emergency lighting power supply | |
| CN211348422U (en) | Digital power meter | |
| CN117782347A (en) | New energy automobile internal temperature detection method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |