CN216252581U - Motor IGBT overcurrent detection device, motor control system and vehicle - Google Patents
Motor IGBT overcurrent detection device, motor control system and vehicle Download PDFInfo
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- CN216252581U CN216252581U CN202122384313.XU CN202122384313U CN216252581U CN 216252581 U CN216252581 U CN 216252581U CN 202122384313 U CN202122384313 U CN 202122384313U CN 216252581 U CN216252581 U CN 216252581U
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Abstract
The utility model discloses a motor IGBT over-current detection device, a motor control system and a vehicle, wherein the motor IGBT over-current detection device comprises: a sensing module; the preprocessing module is connected with the sensing module; the analog comparator module comprises a first comparator unit and a second comparator unit, the input end of the first comparator unit and the input end of the second comparator unit are both connected with the preprocessing module, and the output end of the first comparator unit is connected with the output end of the second comparator unit; and the pull-up resistor module is connected with the output end of the first comparator unit and the output end of the second comparator unit. The IGBT overcurrent detection device of the motor can improve the accuracy of fault judgment.
Description
Technical Field
The utility model relates to the technical field of vehicles, in particular to a motor IGBT overcurrent detection device, a motor control system and a vehicle.
Background
In the running process of the pure electric vehicle, a plurality of sudden conditions are met. Specifically, the fault detection system monitors the output current value in real time, and when it is determined that the output current value of an Insulated Gate Bipolar Transistor (IGBT) is greater than a set threshold point, a fault signal is triggered, and an MCU (Micro Control Unit) executes a command for turning off PWM (Pulse width modulation) wave transmission.
In the related art, for the overcurrent judgment circuit, after a fault signal is detected, the fault is collected only by the Hall current sensor and the analog comparator, although the overcurrent judgment circuit has certain advantages in protection timeliness, the collected fault information has uncertainty, and the overcurrent judgment result is influenced.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, one object of the present invention is to provide a motor IGBT overcurrent detection device, which can improve the accuracy of fault determination.
The second objective of the present invention is to provide a motor control system.
The utility model also aims to provide a vehicle.
In order to solve the above problem, an embodiment of a first aspect of the present invention provides a motor IGBT overcurrent detection apparatus, including: the sensing module is used for collecting the current of the motor winding and converting the current of the motor winding into an initial voltage signal; the preprocessing module is connected with the sensing module and used for preprocessing the initial voltage signal and outputting a preprocessed voltage signal; the analog comparator module comprises a first comparator unit and a second comparator unit, wherein the input end of the first comparator unit and the input end of the second comparator unit are both connected with the preprocessing module, the output end of the first comparator unit is connected with the output end of the second comparator unit, the first comparator unit is used for outputting a low level when the preprocessing voltage signal is greater than a first reference voltage signal, and the second comparator unit is used for outputting a low level when the preprocessing voltage signal is less than a second reference voltage signal; the pull-up resistor module is connected with the output end of the first comparator unit and the output end of the second comparator unit and used for enabling the initial output of the analog comparator module to be a high level; when any one of the first comparator unit and the second comparator unit outputs a low level, the high level initially output by the analog comparator module is inverted to a low level so as to determine that the motor IGBT has an overcurrent fault.
According to the motor IGBT overcurrent detection device, the pull-up resistor module is arranged to enable the output of the analog comparator module to be kept in the initial state of high level, when any one of the first comparator unit and the second comparator unit outputs low level, the high level output initially by the analog comparator module is inverted into low level, therefore, the final output level state of the analog comparator module is judged in a line and logic mode, whether overcurrent faults exist or not is judged according to the final output level state of the analog comparator module, the problem that collected fault signals are uncertain can be avoided, and the fault judgment accuracy is improved.
In some embodiments, the first comparator unit comprises: the first reference voltage subunit, a first end of the first reference voltage subunit is connected with the first ADC reference power supply, and is used for providing a first reference voltage signal; a positive phase input end of the first comparator is connected with the second end of the first reference voltage subunit, an inverted phase input end of the first comparator is used for inputting the pre-processing voltage signal, and an output end of the first comparator is connected with the pull-up resistor module and is used for outputting a low level when the pre-processing voltage signal is greater than a first reference voltage signal; and a first end of the first resistor subunit is connected with the output end of the first comparator, and a second end of the first resistor subunit is connected with the non-inverting input end of the first comparator and is used for feeding back the output signal of the first comparator.
In some embodiments, the second comparator unit comprises: a second reference voltage subunit, a first end of the second reference voltage subunit being connected to a second ADC reference power supply for providing a second reference voltage signal; the inverting input end of the second comparator is connected with the second end of the second reference voltage subunit, the non-inverting input end of the second comparator is used for inputting the preprocessed voltage signal, and the output end of the second comparator is connected with the output end of the first comparator and the pull-up resistor module and is used for outputting a low level when the preprocessed voltage signal is smaller than a second reference voltage signal; and a first end of the second resistor subunit is connected with the output end of the second comparator, and a second end of the second resistor subunit is connected with the non-inverting input end of the second comparator and is used for feeding back an output signal of the second comparator.
In some embodiments, the first reference voltage subunit includes a first resistor, a second resistor, and a first capacitor, wherein a first terminal of the first resistor is connected to the first ADC reference power supply, a second terminal of the first resistor is connected to the positive input terminal of the first comparator, a first terminal of the second resistor is grounded, a second terminal of the second resistor is connected to the positive input terminal of the first comparator, a first terminal of the first capacitor is grounded, and a second terminal of the first capacitor is connected to the positive input terminal of the first comparator; the second reference voltage subunit comprises a third resistor, a fourth resistor and a second capacitor, wherein a first end of the third resistor is connected with the second ADC reference power supply, a second end of the third resistor is connected with the inverting input end of the second comparator, a first end of the fourth resistor is grounded, a second end of the fourth resistor is connected with the inverting input end of the second comparator, a first end of the second capacitor is grounded, and a second end of the second capacitor is connected with the inverting input end of the second comparator.
In some embodiments, the analog comparator module further comprises: the first end of the signal amplification unit is connected with the preprocessing module and is used for amplifying the preprocessed voltage signal and outputting the amplified preprocessed voltage signal; and the first end of the first filtering unit is connected with the second end of the signal amplifying unit, and the second end of the first filtering unit is connected with the inverting input end of the first comparator and the non-inverting input end of the second comparator and is used for filtering the amplified preprocessed voltage signal.
In some embodiments, the signal amplification unit includes: a first end of the fifth resistor is connected with the preprocessing module; a third capacitor, a first end of the third capacitor is grounded; the non-inverting input end of the amplifier is connected with the preprocessing module, the second end of the fifth resistor and the second end of the third capacitor, the output end of the amplifier is connected with the first filtering unit, and the inverting input end of the amplifier is connected with the output end of the amplifier and used for amplifying the preprocessed voltage signal;
the first filtering unit includes: a first end of the sixth resistor is connected with the output end of the amplifier, and a second end of the sixth resistor is connected with the inverting input end of the first comparator and the non-inverting input end of the second comparator; a first end of the fourth capacitor is grounded, and a second end of the fourth capacitor is connected with a second end of the sixth resistor, an inverting input end of the first comparator and a non-inverting input end of the second comparator; a seventh resistor, a first end of the seventh resistor being grounded, and a second end of the seventh resistor being connected to the second end of the sixth resistor, the second end of the fourth capacitor, the inverting input terminal of the first comparator, and the non-inverting input terminal of the second comparator.
In some embodiments, the pull-up resistor module comprises: a first end of the eighth resistor is connected with a preset power supply, and a second end of the eighth resistor is connected with the output end of the first comparator and the output end of the second comparator; and a first end of the fifth capacitor is grounded, and a second end of the fifth capacitor is connected with the output end of the first comparator and the output end of the second comparator.
In some embodiments, the pre-processing module comprises: the first end of the impedance conversion circuit unit is connected with the sensing module and used for performing voltage conversion on the initial voltage signal and outputting a converted voltage signal; and a second filtering unit, a first end of which is connected to the second end of the impedance transformation circuit unit, and a second end of which is connected to the first end of the signal amplifying unit, and configured to filter the converted voltage signal and output a filtered voltage signal as the preprocessed voltage signal.
An embodiment of a second aspect of the present invention provides a motor control system, including: an IGBT for driving the motor; in the motor IGBT overcurrent detection device according to the embodiment, the motor IGBT overcurrent detection device is configured to output an overcurrent fault signal when detecting that the motor IGBT is overcurrent; the control board is connected with the drive board, the drive board is connected with the IGBT, and the control board is used for cutting off motor driving signals sent to the drive board when receiving the overcurrent fault signals.
According to the motor control system provided by the utility model, by adopting the motor IGBT overcurrent detection device provided by the embodiment, the uncertainty of the collected fault signal can be reduced, and the accuracy of fault judgment is improved.
In an embodiment of a third aspect of the present invention, a vehicle is provided, which includes a motor and the motor control system of the above embodiment, and the motor control system is connected to the motor.
According to the vehicle provided by the utility model, by adopting the motor control system provided by the embodiment, the uncertainty of the acquired fault signal can be reduced, and the accuracy of fault judgment is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a structure of an IGBT overcurrent detection device of a motor according to an embodiment of the present invention;
FIG. 2 is a block diagram of an analog comparator module according to one embodiment of the utility model;
FIG. 3 is a comparison of waveforms according to one embodiment of the present invention;
FIG. 4 is a block diagram of a motor control system according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of a motor control system according to another embodiment of the present invention;
fig. 6 is a block diagram of a vehicle structure according to an embodiment of the utility model.
Reference numerals:
a vehicle 100;
a motor IGBT overcurrent detection device 10; a motor control system 20; a motor 30;
a sensing module 1; a preprocessing module 2; an analog comparator module 3; a pull-up resistor module 4; an IGBT 5; a control panel 6; a drive plate 7;
a first comparator unit 31; a second comparator unit 32; a signal amplification unit 33; a first filtering unit 34; an impedance conversion circuit unit 21; a second filtering unit 22;
a first reference subunit 310; a first resistance subunit 311; a second reference subunit 320; a second resistor subunit 321.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In order to solve the above problem, an embodiment of the first aspect of the present invention provides a motor IGBT over-current detection device, which can improve accuracy of fault determination.
The following describes a motor IGBT overcurrent detection device according to an embodiment of the present invention with reference to fig. 1.
As shown in fig. 1, the motor IGBT overcurrent detection device 10 includes a sensing module 1, a preprocessing module 2, an analog comparator module 3, and a pull-up resistor module 4.
The sensing module 1 is used for collecting the current of the motor winding and converting the current of the motor winding into an initial voltage signal; the preprocessing module 2 is connected with the sensing module 1 and used for preprocessing the initial voltage signal and outputting a preprocessed voltage signal; as shown in fig. 2, the analog comparator module 3 includes a first comparator unit 31 and a second comparator unit 32, an input terminal of the first comparator unit 31 and an input terminal of the second comparator unit 32 are both connected to the preprocessing module 2, an output terminal of the first comparator unit 31 is connected to an output terminal of the second comparator unit 32, the first comparator unit 31 is configured to output a low level when the preprocessed voltage signal is greater than the first reference voltage signal, and the second comparator unit 32 is configured to output a low level when the preprocessed voltage signal is less than the second reference voltage signal; the pull-up resistor module 4 is connected to the output terminal of the first comparator unit 31 and the output terminal of the second comparator unit 32, and is configured to make the initial output of the analog comparator module 3 be a high level. Wherein, when any one of the first comparator unit 31 and the second comparator unit 32 outputs a low level, the high level initially output by the analog comparator module 3 is inverted to a low level to determine that the motor IGBT has an overcurrent fault.
Specifically, the sensing module 1, such as a hall current sensor, collects the current of the three-phase winding of the motor, generates a hall potential after internal conversion, and finally outputs the hall potential in the form of voltage, that is, an output initial voltage signal. The initial voltage signal is preprocessed by the preprocessing module 2 and then outputs a preprocessed voltage signal, and the preprocessed voltage signal outputs a final level signal through the first comparator unit 31 and the second comparator unit 32 in the analog comparator module 3. The pull-up resistance module 4 keeps the output end of the first comparator unit 31 and the output end of the second comparator unit 32 in the initial state of high level, and when any one of the output ends of the first comparator unit 31 and the second comparator unit 32 outputs low level, the initial output of the analog comparator module 3 is inverted from high level to low level by adopting a wire and logic mode, so that the overcurrent fault of the motor IGBT can be judged. Therefore, overcurrent fault detection can be realized, the whole circuit can be protected in time, the accuracy of the collected fault signal can be ensured, the fault judgment accuracy is improved, and the circuit design mode is simple and easy to realize.
According to the motor IGBT overcurrent detection device 10, the pull-up resistor module 4 is arranged to enable the output of the analog comparator module 3 to be kept in the initial state of high level, when any one of the first comparator unit 31 and the second comparator unit 32 outputs low level, the high level initially output by the analog comparator module 3 is inverted into low level, therefore, the final output level state of the analog comparator module 3 is judged in a wire and logic mode, whether overcurrent faults exist is judged according to the final output level state of the analog comparator module, the problem that collected fault signals are uncertain can be avoided, and the fault judgment accuracy is improved.
In some embodiments, first comparator unit 31 includes a first reference voltage subunit 310, a first comparator U1, and a first resistance subunit 311.
A first end of the first reference voltage subunit 310 is connected to the first ADC reference power Vo +, and is configured to provide a first reference voltage signal; a non-inverting input terminal of the first comparator U1 is connected to the second terminal of the first reference voltage subunit 310, an inverting input terminal of the first comparator U1 is used for inputting the pre-processed voltage signal, and an output terminal of the first comparator U1 is connected to the pull-up resistor module 4 and is used for outputting a low level when the pre-processed voltage signal is greater than the first reference voltage signal; a first terminal of the first resistor subunit 311 is connected to the output terminal of the first comparator U1, and a second terminal of the first resistor subunit 311 is connected to the non-inverting input terminal of the first comparator U1, for feeding back the output signal of the first comparator U1.
In some embodiments, second comparator unit 32 includes a second reference voltage subunit 320, a second comparator U2, and a second resistance subunit 321.
A first end of the second reference voltage subunit 320 is connected to the second ADC reference power Vo +, and is configured to provide a second reference voltage signal; an inverting input terminal of the second comparator U2 is connected to the second terminal of the second reference voltage subunit 320, a non-inverting input terminal of the second comparator U2 is used for inputting the preprocessed voltage signal, and an output terminal of the second comparator U2 is connected to the output terminal of the first comparator U1 and the pull-up resistor module 4, and is used for outputting a low level when the preprocessed voltage signal is smaller than the second reference voltage signal; the first terminal of the second resistor subunit 321 is connected to the output terminal of the second comparator U2, and the second terminal of the second resistor subunit 321 is connected to the non-inverting input terminal of the second comparator U2, for feeding back the output signal of the second comparator U2.
Therefore, the first comparator unit 31 and the second comparator unit 32 are arranged in the above manner, and the ADC reference power Vo + is used for independently supplying power to complete the matching of the high and low threshold parameters, so that the reference threshold voltage can be maintained in a relatively stable state. And, the first comparator unit 31 and the second comparator unit 32 are respectively provided with a first resistance subunit 311 and a second resistance subunit 321, and form a hysteresis comparison circuit in a positive feedback manner, so as to solve the oscillation phenomenon of a fault signal acquisition threshold point, prolong the time of fault signal acquisition recovery, so that more response time is available subsequently to accurately position and process faults, prevent damage to each component circuit in the control system, and ensure the personal safety of passengers.
For example, referring to fig. 2, the first resistor subunit 311 includes a resistor Ra1, the second resistor subunit 321 includes a resistor Ra2, and Ra1 is Ra2 is 830K, the hysteresis interval current difference between the fault protection point and the fault recovery point can be set to 30 amperes according to practical situations, the analog comparator module 3 is set according to the above, after the analog comparator module 3 is simulated by simulation software, the measurement waveform result is as shown in fig. 3, the time of the fault collecting signal is 60us when the hysteresis circuit is not added, and the time of the fault collecting signal is 90us after the hysteresis circuit is added, so that compared with the waveform when the hysteresis circuit is not added, the fault recovery threshold point of the embodiment of the utility model obviously lags behind the fault protection threshold point, and the fault signal collecting recovery time is obviously prolonged, therefore, by setting the first resistor subunit 311 and the second resistor subunit 321 to form a positive feedback comparison circuit, the oscillation phenomenon of a fault signal acquisition threshold point can be effectively solved, the acquired data is more real and reliable, the fault judgment accuracy is improved, and meanwhile, the fault signal acquisition recovery time is prolonged, so that more response time is provided for accurately positioning and processing faults, each component circuit in a control system is prevented from being damaged, and the personal safety of passengers is ensured.
In some embodiments, the first reference voltage subunit 310 includes a first resistor R1, a second resistor R2, and a first capacitor C1.
A first end of the first resistor R1 is connected to the first ADC reference power supply, a second end of the first resistor R1 is connected to the positive input terminal of the first comparator U1, a first end of the second resistor R2 is grounded, a second end of the second resistor R2 is connected to the positive input terminal of the first comparator U1, a first end of the first capacitor C1 is grounded, and a second end of the first capacitor C1 is connected to the positive input terminal of the first comparator U1.
And, the second reference voltage subunit 320 includes a third resistor R3, a fourth resistor R4, and a second capacitor C2.
The first end of the third resistor R3 is connected to the second ADC reference power supply, the second end of the third resistor R3 is connected to the inverting input terminal of the second comparator U2, the first end of the fourth resistor R4 is grounded, the second end of the fourth resistor R4 is connected to the inverting input terminal of the second comparator U2, the first end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is connected to the inverting input terminal of the second comparator U2.
In some embodiments, the analog comparator module 3 further comprises a signal amplification unit 33 and a first filtering unit 34.
The first end of the signal amplification unit 33 is connected to the preprocessing module 2, and is configured to amplify the preprocessed voltage signal and output the amplified preprocessed voltage signal; a first end of the first filtering unit 34 is connected to the second end of the signal amplifying unit 33, and a second end of the first filtering unit 34 is connected to an inverting input terminal of the first comparator U1 and a non-inverting input terminal of the second comparator U2, and is configured to perform filtering processing on the amplified pre-processed voltage signal.
In some embodiments, the signal amplifying unit 33 includes a fifth resistor R5, a third capacitor C3, and an amplifier U0.
The first end of the fifth resistor R5 is connected with the preprocessing module 2; the first end of the third capacitor C3 is grounded; the non-inverting input terminal of the amplifier U0 is connected to the preprocessing module 2, the second terminal of the fifth resistor R5, and the second terminal of the third capacitor C3, the output terminal of the amplifier U0 is connected to the first filtering unit 34, and the inverting input terminal of the amplifier U0 is connected to the output terminal of the amplifier U0, and is configured to amplify the preprocessed voltage signal.
And, the first filtering unit 34 includes a sixth resistor R6, a fourth capacitor C4, and a seventh resistor R7.
A first end of the sixth resistor R6 is connected to the output end of the amplifier, and a second end of the sixth resistor R6 is connected to the inverting input end of the first comparator U1 and the non-inverting input end of the second comparator U2; a first end of the fourth capacitor C4 is grounded, and a second end of the fourth capacitor C4 is connected to a second end of the sixth resistor R6, an inverting input terminal of the first comparator U1 and a non-inverting input terminal of the second comparator U2; a first end of the seventh resistor R7 is grounded, and a second end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, the second end of the fourth capacitor C4, the inverting input terminal of the first comparator U1, and the non-inverting input terminal of the second comparator U2.
In some embodiments, pull-up resistor module 4 includes an eighth resistor R8 and a fifth capacitor C5.
A first end of the eighth resistor R8 is connected to a preset power supply V +, and a second end of the eighth resistor R8 is connected to an output end of the first comparator U1 and an output end of the second comparator U2; a first terminal of the fifth capacitor C5 is connected to ground, and a second terminal of the fifth capacitor is connected to the output terminal of the first comparator U1 and the output terminal of the second comparator U2. This is arranged so that the output of the analog comparator block 3 is maintained at the initial state of high level.
In some embodiments, the pre-processing module 2 includes an impedance transformation circuit unit 21 and a second filtering unit 22.
The first end of the impedance transformation circuit unit 21 is connected to the sensing module 1, and is configured to perform voltage transformation on the initial voltage signal and output a transformed voltage signal; a first end of the second filtering unit 22 is connected to the second end of the impedance transformation circuit unit 21, and a second end of the second filtering unit 22 is connected to the first end of the signal amplifying unit 33, and is configured to perform filtering processing on the converted voltage signal and output the filtered voltage signal as a preprocessed voltage signal.
In a second aspect of the present invention, an embodiment provides a motor control system, as shown in fig. 4, the motor control system 20 includes an IGBT 5 for driving a motor, the motor IGBT overcurrent detection device 10 provided in the above embodiment, a control board 6, and a drive board 7.
The motor IGBT overcurrent detection device 10 is used for outputting an overcurrent fault signal when detecting that the motor IGBT 5 is overcurrent; the control board 6 is connected with the drive board 7, the drive board 7 is connected with the IGBT 5, and the control board 6 is used for cutting off the motor driving signal sent to the drive board 7 when receiving an overcurrent fault signal.
For example, referring to fig. 5, the control board 6 collects currents of three-phase windings of the motor through the sensing module 1 in the motor IGBT overcurrent detection device 10, collects current running physical quantities such as motor angle and speed in combination with a feedback signal, and outputs a PWM wave signal with a certain time sequence to the drive board 7 to drive the IGBT 5 after a specific algorithm operation, thereby controlling the rotation speed and torque of the motor. And when the motor IGBT overcurrent detection device 10 determines that the motor IGBT 5 has overcurrent faults, the motor IGBT overcurrent detection device informs the control board 6 in a low level mode, so that the control board 6 can judge as a fault state, and executes a command of turning off PWM wave transmission to avoid the damage of the motor control system 20.
According to the motor control system 20 of the present invention, by using the motor IGBT overcurrent detection apparatus 10 provided in the above embodiment, the uncertainty of the acquired fault signal can be reduced, and the accuracy of fault determination can be improved.
In an embodiment of a third aspect of the present invention, as shown in fig. 6, the vehicle 100 includes a motor 30 and the motor control system 20 provided in the above embodiment, and the motor control system 20 is connected to the motor 30.
According to the vehicle 100 of the present invention, by controlling the motor 30 using the motor control system 20 provided in the above embodiment, the uncertainty of the acquired fault signal can be reduced, and the accuracy of fault determination can be improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a motor IGBT overflows detection device which characterized in that includes:
the sensing module is used for collecting the current of the motor winding and converting the current of the motor winding into an initial voltage signal;
the preprocessing module is connected with the sensing module and used for preprocessing the initial voltage signal and outputting a preprocessed voltage signal;
the analog comparator module comprises a first comparator unit and a second comparator unit, wherein the input end of the first comparator unit and the input end of the second comparator unit are both connected with the preprocessing module, the output end of the first comparator unit is connected with the output end of the second comparator unit, the first comparator unit is used for outputting a low level when the preprocessing voltage signal is greater than a first reference voltage signal, and the second comparator unit is used for outputting a low level when the preprocessing voltage signal is less than a second reference voltage signal;
the pull-up resistor module is connected with the output end of the first comparator unit and the output end of the second comparator unit and used for enabling the initial output of the analog comparator module to be a high level;
when any one of the first comparator unit and the second comparator unit outputs a low level, the high level initially output by the analog comparator module is inverted to a low level so as to determine that the motor IGBT has an overcurrent fault.
2. The motor IGBT overcurrent detection apparatus according to claim 1, wherein the first comparator unit includes:
the first reference voltage subunit, a first end of the first reference voltage subunit is connected with the first ADC reference power supply, and is used for providing a first reference voltage signal;
a positive phase input end of the first comparator is connected with the second end of the first reference voltage subunit, an inverted phase input end of the first comparator is used for inputting the pre-processing voltage signal, and an output end of the first comparator is connected with the pull-up resistor module and is used for outputting a low level when the pre-processing voltage signal is greater than a first reference voltage signal;
and a first end of the first resistor subunit is connected with the output end of the first comparator, and a second end of the first resistor subunit is connected with the non-inverting input end of the first comparator and is used for feeding back the output signal of the first comparator.
3. The motor IGBT overcurrent detection apparatus according to claim 2, wherein the second comparator unit includes:
a second reference voltage subunit, a first end of the second reference voltage subunit being connected to a second ADC reference power supply for providing a second reference voltage signal;
the inverting input end of the second comparator is connected with the second end of the second reference voltage subunit, the non-inverting input end of the second comparator is used for inputting the preprocessed voltage signal, and the output end of the second comparator is connected with the output end of the first comparator and the pull-up resistor module and is used for outputting a low level when the preprocessed voltage signal is smaller than a second reference voltage signal;
and a first end of the second resistor subunit is connected with the output end of the second comparator, and a second end of the second resistor subunit is connected with the non-inverting input end of the second comparator and is used for feeding back an output signal of the second comparator.
4. The motor IGBT over-current detection device of claim 3,
the first reference voltage subunit comprises a first resistor, a second resistor and a first capacitor, wherein a first end of the first resistor is connected with the first ADC reference power supply, a second end of the first resistor is connected with a positive input end of a first comparator, a first end of the second resistor is grounded, a second end of the second resistor is connected with a positive input end of the first comparator, a first end of the first capacitor is grounded, and a second end of the first capacitor is connected with a positive input end of the first comparator;
the second reference voltage subunit comprises a third resistor, a fourth resistor and a second capacitor, wherein a first end of the third resistor is connected with the second ADC reference power supply, a second end of the third resistor is connected with the inverting input end of the second comparator, a first end of the fourth resistor is grounded, a second end of the fourth resistor is connected with the inverting input end of the second comparator, a first end of the second capacitor is grounded, and a second end of the second capacitor is connected with the inverting input end of the second comparator.
5. The motor IGBT overcurrent detection apparatus of claim 3, wherein the analog comparator module further comprises:
the first end of the signal amplification unit is connected with the preprocessing module and is used for amplifying the preprocessed voltage signal and outputting the amplified preprocessed voltage signal;
and the first end of the first filtering unit is connected with the second end of the signal amplifying unit, and the second end of the first filtering unit is connected with the inverting input end of the first comparator and the non-inverting input end of the second comparator and is used for filtering the amplified preprocessed voltage signal.
6. The motor IGBT over-current detection device of claim 5,
the signal amplification unit includes:
a first end of the fifth resistor is connected with the preprocessing module;
a third capacitor, a first end of the third capacitor is grounded;
the non-inverting input end of the amplifier is connected with the preprocessing module, the second end of the fifth resistor and the second end of the third capacitor, the output end of the amplifier is connected with the first filtering unit, and the inverting input end of the amplifier is connected with the output end of the amplifier and used for amplifying the preprocessed voltage signal;
the first filtering unit includes:
a first end of the sixth resistor is connected with the output end of the amplifier, and a second end of the sixth resistor is connected with the inverting input end of the first comparator and the non-inverting input end of the second comparator;
a first end of the fourth capacitor is grounded, and a second end of the fourth capacitor is connected with a second end of the sixth resistor, an inverting input end of the first comparator and a non-inverting input end of the second comparator;
a seventh resistor, a first end of the seventh resistor being grounded, and a second end of the seventh resistor being connected to the second end of the sixth resistor, the second end of the fourth capacitor, the inverting input terminal of the first comparator, and the non-inverting input terminal of the second comparator.
7. The motor IGBT over-current detection device of claim 3, wherein the pull-up resistance module comprises:
a first end of the eighth resistor is connected with a preset power supply, and a second end of the eighth resistor is connected with the output end of the first comparator and the output end of the second comparator;
and a first end of the fifth capacitor is grounded, and a second end of the fifth capacitor is connected with the output end of the first comparator and the output end of the second comparator.
8. The motor IGBT over-current detection device of claim 5, characterized in that the preprocessing module comprises:
the first end of the impedance conversion circuit unit is connected with the sensing module and used for performing voltage conversion on the initial voltage signal and outputting a converted voltage signal;
and a second filtering unit, a first end of which is connected to the second end of the impedance transformation circuit unit, and a second end of which is connected to the first end of the signal amplifying unit, and configured to filter the converted voltage signal and output a filtered voltage signal as the preprocessed voltage signal.
9. A motor control system, comprising:
an IGBT for driving the motor;
the motor IGBT over-current detection device of any one of claims 1 to 7, which is used for outputting an over-current fault signal when detecting the over-current of the motor IGBT;
the control board is connected with the drive board, the drive board is connected with the IGBT, and the control board is used for cutting off motor driving signals sent to the drive board when receiving the overcurrent fault signals.
10. A vehicle comprising an electric machine and the motor control system of claim 9, the motor control system being connected to the electric machine.
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| CN202122384313.XU CN216252581U (en) | 2021-09-29 | 2021-09-29 | Motor IGBT overcurrent detection device, motor control system and vehicle |
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| CN202122384313.XU CN216252581U (en) | 2021-09-29 | 2021-09-29 | Motor IGBT overcurrent detection device, motor control system and vehicle |
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