CN109450339B - Motor controller - Google Patents
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- CN109450339B CN109450339B CN201811397408.1A CN201811397408A CN109450339B CN 109450339 B CN109450339 B CN 109450339B CN 201811397408 A CN201811397408 A CN 201811397408A CN 109450339 B CN109450339 B CN 109450339B
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- 238000001514 detection method Methods 0.000 claims abstract description 88
- 238000012360 testing method Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000000875 corresponding effect Effects 0.000 description 69
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
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- 239000003990 capacitor Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
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Abstract
The motor controller provided by the invention collects base state signals and two-end differential pressure detection signals of N switching tubes in an inverter circuit through a driving circuit of the motor controller, and outputs the base state signals and the two-end differential pressure detection signals of the N switching tubes to a control circuit; and comparing the base state signals and the pressure difference detection signals at two ends of the N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state by the control circuit, if all comparison results are consistent with the corresponding expected outputs, judging that the turn-off path of the motor controller is normal, and otherwise, judging that the turn-off path of the motor controller has a fault. According to the invention, the detection of the turn-off path of the motor controller can cover the drive circuit and the switch tube by collecting and judging the base state signals of N switch tubes in the inverter circuit and the differential pressure detection signals at two ends, so that the reliability of the detection result is improved compared with the prior art.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a motor controller.
Background
As shown in fig. 1, a control/drive circuit of the motor controller in the pure electric vehicle and the hybrid electric vehicle inverts direct current Udc provided by a high-voltage battery into three-phase alternating current through an inverter circuit (including S1 to S6 shown in fig. 1) according to the control requirement of the whole vehicle; the three-phase ac power is then input to the motor windings for driving the motor M, thereby providing driving or braking torque to the vehicle.
At present, the whole domestic automobile factory puts forward the requirement of functional safety on the motor controller, and the motor controller is required to enter a safe state through a shut-off path when detecting a fault which violates a safety target; furthermore, the shut-off path is required to be detected in each driving cycle; as shown in fig. 2, in the conventional detection scheme, corresponding turn-off execution signals from S1 to S6 are respectively output by a control circuit when entering a safe state, and a driving circuit generates corresponding IGBT (Insulated Gate Bipolar Transistor) driving signals according to the received turn-off execution signals so as to control the corresponding IGBT to operate; and the control circuit recovers each shut-off execution signal and compares whether the shut-off execution signal is consistent with the expected output when the shut-off execution signal enters the safe state; and if the comparison results of the 6 times are consistent, judging that the shutdown path has no fault.
However, the current detection scheme for the turn-off path only covers the detection for the control circuit, and the conditions of the drive circuit and the IGBT are not detected; if the driving circuit fails, the IGBT cannot be switched on or switched off according to the requirement of a safe state; if the IGBT fails, the IGBT cannot be normally switched on or switched off. Therefore, the existing detection scheme has low reliability of detection results.
Disclosure of Invention
The invention provides a motor controller, which aims to solve the problem of low reliability of detection results in the prior art.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
a motor controller comprising: the control circuit, the drive circuit and the inverter circuit; the inverter circuit comprises N switching tubes, wherein N is a positive integer; the motor controller is when starting up:
the control circuit is used for generating and outputting N turn-off execution signals;
the drive circuit is used for generating and outputting N drive signals according to the N turn-off execution signals, so that the N switching tubes are respectively turned on or off according to the corresponding drive signals; the driving circuit is also used for collecting base state signals and two-end differential pressure detection signals of the N switching tubes and outputting the base state signals and the two-end differential pressure detection signals of the N switching tubes to the control circuit;
the control circuit is further used for comparing base state signals and two-end pressure difference detection signals of the N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state, if all comparison results are consistent with the corresponding expected outputs, judging that a turn-off path of the motor controller is normal, and otherwise, judging that the turn-off path of the motor controller fails.
Preferably, the control circuit includes: a microprocessor and a logic operation circuit; wherein:
the microprocessor is used for generating and outputting an active short circuit enabling signal; comparing base state signals and differential pressure detection signals at two ends of N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state respectively, if each comparison result is consistent with the corresponding expected output, judging that a turn-off path of the motor controller is normal, otherwise, judging that the turn-off path of the motor controller has a fault;
the logic operation circuit is used for generating and outputting N turn-off execution signals according to the active short circuit enable signal.
Preferably, the microprocessor is configured to compare base state signals and two-end differential pressure detection signals of the N switching tubes with 2N corresponding expected outputs when the motor controller enters the safety state, and if each comparison result is consistent with the corresponding expected output, determine that a shutdown path of the motor controller is normal, otherwise determine that the shutdown path of the motor controller fails, and specifically configured to:
comparing base state signals of N switching tubes with N corresponding expected outputs when the motor controller enters a safe state;
under the condition that each comparison result is consistent with the corresponding expected output, comparing the pressure difference detection signals at two ends of N switching tubes with the other N corresponding expected outputs when the motor controller enters a safe state respectively;
and if the comparison results of the two comparisons are consistent with the corresponding expected outputs, judging that the shutdown path of the motor controller is normal, otherwise, judging that the shutdown path of the motor controller has a fault.
Preferably, the microprocessor is configured to compare base state signals and two-end differential pressure detection signals of the N switching tubes with 2N corresponding expected outputs when the motor controller enters the safety state, and if each comparison result is consistent with the corresponding expected output, determine that a shutdown path of the motor controller is normal, otherwise determine that the shutdown path of the motor controller fails, and specifically configured to:
comparing base state signals of the N switching tubes with N corresponding expected outputs when the motor controller enters a safe state respectively; meanwhile, the pressure difference detection signals at two ends of N switching tubes are respectively compared with the other N corresponding expected outputs when the motor controller enters a safe state;
and if all the comparison results are consistent with the corresponding expected outputs, judging that the shutdown path of the motor controller is normal, otherwise, judging that the shutdown path of the motor controller has a fault.
Preferably, the control circuit further includes: the system comprises a system monitoring chip, a sampling circuit and a communication circuit;
the system monitoring chip, the sampling circuit and the communication circuit are all connected with the microprocessor.
Preferably, the drive circuit includes: the device comprises an amplifying circuit, an acquisition circuit and a VCE detection circuit; wherein:
the amplifying circuit is used for generating and outputting N driving signals according to the N turn-off executing signals;
the acquisition circuit is used for acquiring base state signals of the N switching tubes;
the VCE detection circuit is used for collecting the voltage difference detection signals at the two ends of the N switching tubes.
Preferably, the driving circuit further includes: and one side of the isolation module is connected with the control circuit, and the other side of the isolation module is respectively connected with the amplifying circuit, the acquisition circuit and the VCE detection circuit.
Preferably, the method further comprises the following steps: n anti-reverse circuits;
the output end of the anti-reverse circuit is connected with the collector of the corresponding switch tube and the input end of the VCE detection circuit;
the input end of the anti-reverse circuit is used for receiving test power supply of the corresponding switch tube.
Preferably, the test supply originates from: the base electrode of the corresponding switch tube supplies power, or the high-voltage battery connected with the motor controller supplies power under a preset time sequence; or,
the motor controller further includes: and the test power supply module is used for generating the test power supply.
Preferably, the anti-reverse circuit includes: a resistor and a diode connected in series;
the direction of the diode is the same as the direction from the input end to the output end of the anti-reverse circuit.
The motor controller provided by the invention generates and outputs N turn-off execution signals through a control circuit thereof; then, the driving circuit generates and outputs N driving signals according to the N turn-off execution signals, so that N switching tubes in the inverter circuit are respectively turned on or off according to the corresponding driving signals; the driving circuit can also collect base state signals and two-end differential pressure detection signals of the N switching tubes and output the base state signals and the two-end differential pressure detection signals of the N switching tubes to the control circuit; and comparing the base state signals and the pressure difference detection signals at two ends of the N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state by the control circuit, if all comparison results are consistent with the corresponding expected outputs, judging that the turn-off path of the motor controller is normal, and otherwise, judging that the turn-off path of the motor controller has a fault. According to the invention, the detection of the turn-off path of the motor controller can cover the drive circuit and the switch tube by collecting and judging the base state signals of N switch tubes in the inverter circuit and the differential pressure detection signals at two ends, so that the reliability of the detection result is improved compared with the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a motor controller provided in the prior art;
FIG. 2 is a signal transmission schematic of a prior art motor controller off path detection scheme;
FIG. 3 is a signal transmission diagram of a motor controller off path detection scheme provided by an embodiment of the present invention;
fig. 4 is a signal transmission specific schematic diagram of a motor controller off path detection scheme according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments 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.
The invention provides a motor controller, which aims to solve the problem of low reliability of detection results in the prior art.
As shown in fig. 3, the motor controller includes: control circuit 100, drive circuit 200 and inverter circuit.
The inverter circuit comprises N switching tubes, such as N IGBTs, wherein N is a positive integer.
In practical application, the value of N may be determined according to a specific application environment, for example, in the field of control of a single-phase motor, if the inverter circuit adopts a single-phase full-bridge topology, N is 4 at this time; in the field of pure electric vehicles and hybrid electric vehicles, a motor controller of the pure electric vehicle needs to drive a three-phase motor, so an inverter circuit in the motor controller of the pure electric vehicle is generally a three-phase full-bridge topology, as shown in fig. 1, where N is 6.
Fig. 3 shows only one of the switching tubes in the inverter circuit, and the bases of the remaining switching tubes are connected to corresponding ports of the driving circuit 200, which is not shown and described herein.
When the motor controller is started, the specific working principle inside the motor controller is as follows:
the control circuit 100 is configured to generate and output N shutdown execution signals.
The driving circuit 200 is configured to generate and output N driving signals according to the N turn-off execution signals, so that the N switching tubes are turned on or off according to the corresponding driving signals, respectively.
In practical applications, the motor controller generally enters a safe state by an active short-circuit mode, and there are two main modes for implementing the active short-circuit: one is an active short circuit of the upper bridge arm, namely, the switching tubes S2, S4 and S6 are turned off in FIG. 1, and the switching tubes S1, S3 and S5 are turned on; the other is active short circuit of the lower bridge arm, namely, in fig. 1, the switching tubes S1, S3 and S5 are turned off, and the switching tubes S2, S4 and S6 are turned on.
When the motor M is actively short-circuited, the back electromotive force generated by the rotation of the motor M in fig. 1 generates a current in the winding thereof, the current forms a follow current loop through the short-circuited bridge arm or the anti-parallel diode thereof, and does not pass through the high-voltage battery and the bus support capacitor C, the generated braking torque is small, and thus the safety can be ensured.
That is, the N driving signals output by the driving circuit 200 are different, and fig. 1 is taken as an example to illustrate, where 3 driving signals are signals for controlling the corresponding switch tubes to be turned on, and the other 3 driving signals are signals for controlling the corresponding switch tubes to be turned off.
In the prior art, after the control circuit 100 generates and outputs N turn-off execution signals, on one hand, the N drive signals output by the drive circuit 200 control the N switching tubes to perform active short circuit, so that the motor controller enters a safe state, and on the other hand, whether a turn-off path is normal or not is determined by extracting the turn-off execution signals output by the control circuit 100.
In order to solve the problems of low detection coverage and low detection result reliability caused by only extracting and judging the shutdown execution signals output by the control circuit 100 in the prior art, when the control circuit 100 in the embodiment generates and outputs N shutdown execution signals, the control circuit can internally generate a control expectation corresponding to the time of entering the safety state, or can mobilize a prestored control expectation corresponding to the time of entering the safety state; the control expectation includes: n driving signals that the driving circuit 200 should output, and the actions that the N switching tubes should perform according to the corresponding driving signals; whether the N driving signals output by the driving circuit 200 are the N driving signals that the driving circuit should output can be obtained by collecting and judging the base state signals of the corresponding switching tubes; whether the N switching tubes can perform corresponding actions according to corresponding driving signals or not can be obtained by acquiring and judging pressure difference detection signals at two ends of the corresponding switching tubes; the two-end differential pressure detection signal specifically refers to a differential pressure detection signal between a collector and an emitter of the switching tube.
Therefore, the driving circuit 200 in this embodiment is further configured to collect the base state signals and the two-terminal voltage difference detection signals of the N switching tubes, and output the base state signals and the two-terminal voltage difference detection signals of the N switching tubes to the control circuit 100.
And, the control circuit 100 is further configured to compare the base state signals of the N switching tubes and the differential pressure detection signals at two ends with 2N corresponding expected outputs when the motor controller enters the safety state, and if each comparison result is consistent with the corresponding expected output, determine that the shutdown path of the motor controller is normal, otherwise determine that the shutdown path of the motor controller fails. In the actual process of implementing the comparison and determination, the control circuit 100 may compare the base state signals of the N switching tubes with the N corresponding expected outputs when the motor controller enters the safe state, respectively, compare the voltage difference detection signals at two ends of the N switching tubes with the other N corresponding expected outputs when the motor controller enters the safe state, respectively, if the N comparison results are all consistent with the corresponding expected outputs, determine that the turn-off path of the motor controller is normal, otherwise determine that the turn-off path of the motor controller fails; or, when the base state signals of the N switching tubes are respectively compared with the N corresponding expected outputs when the motor controller enters the safe state, the differential pressure detection signals at two ends of the N switching tubes are also respectively compared with the other N corresponding expected outputs when the motor controller enters the safe state, if 2N comparison results are consistent with the corresponding expected outputs, the turn-off path of the motor controller is determined to be normal, otherwise, the turn-off path of the motor controller is determined to be failed. In addition, in practical application, the control circuit 100 may further group the N switching tubes or perform the comparison and determination of the two signals one by one, and each group of switching tubes or each switching tube may also perform the comparison and determination of the two signals according to the above sequence or simultaneously. Without limitation, and depending on the specific application, are within the scope of the present application.
This motor controller that this embodiment provided, through above-mentioned principle, can gather and judge the base state signal of N switch tubes among the inverter circuit and both ends pressure difference detection signal for motor controller's turn-off path detects and can cover drive circuit and switch tube, compares prior art and has improved the reliability of testing result.
Another embodiment of the present invention further provides a specific motor controller, based on the above embodiment and fig. 3, preferably, referring to fig. 4, the control circuit 100 includes: a microprocessor 101, a logic operation circuit 102, a system monitoring chip 103, a sampling circuit 104 and a communication circuit 105; the logic operation circuit 102, the system monitoring chip 103, the sampling circuit 104 and the communication circuit 105 are all connected to the microprocessor 101.
Taking the inverter circuit shown in fig. 1 as an example, when the motor controller works normally, the microprocessor 101 of the motor controller is configured to generate and output a normal operation control signal, the logic operation circuit 102 of the motor controller generates and outputs 6 paths of PWM signals to the driving circuit 200 according to the operation control signal, and the driving circuit 200 drives 6 switching tubes in the inverter circuit according to the PWM signals.
When the motor controller is started up and detected, the microprocessor 101 of the motor controller is used for generating and outputting an active short circuit enabling signal; the logic operation circuit 102 generates and outputs N turn-off execution signals to the driving circuit 200 according to the active short-circuit enable signal, and then drives the inverter circuit to realize active short-circuit.
And the microprocessor 101 compares the base state signals of the N switching tubes and the differential pressure detection signals at two ends with 2N corresponding expected outputs when the motor controller enters a safe state, and if all the comparison results are consistent with the corresponding expected outputs, the shutdown path of the motor controller is judged to be normal, otherwise, the shutdown path of the motor controller is judged to be in fault.
The specific process of the microprocessor 101 executing the comparison and judgment is as follows:
firstly, base state signals of N switching tubes are respectively compared with N corresponding expected outputs when a motor controller enters a safe state; since the base state signal of the switching tube can represent the received driving signal, N corresponding expected outputs in this comparison are the base state signals of N switching tubes that should be obtained normally when the driving circuit 200 receives N turn-off execution signals, respectively.
If the comparison result is inconsistent with the corresponding expected output, it indicates that the control circuit 100 and/or the driving circuit 200 cannot normally execute the active short-circuit function, and at this time, it is determined that the shutdown path of the motor controller has a fault;
if each comparison result is consistent with the corresponding expected output, it indicates that the control circuit 100 and the driving circuit 200 can both normally perform the active short-circuit function, and at this time, it is necessary to further determine whether each switching tube can normally perform the active turn-off function, that is, it is necessary to compare the two-end differential pressure detection signals of N switching tubes with the other N corresponding expected outputs when the motor controller enters the safe state; the other N corresponding expected outputs used in this comparison are respectively the voltage differences between the collector and emitter obtained after the N switching tubes correctly act according to the corresponding driving signals.
If the comparison result is inconsistent with the corresponding expected output, the situation that the corresponding switch tube cannot normally execute the active turn-off function is indicated, and at the moment, the turn-off path of the motor controller is judged to be in fault;
if each comparison result of the comparison is consistent with the corresponding expected output, it indicates that the control circuit 100, the driving circuit 200, and the N switching tubes can normally perform the active turn-off function, and at this time, it is determined that the turn-off path of the motor controller is normal.
For the driving circuit 200, see fig. 4, it specifically includes: an amplifying circuit 201, an acquisition circuit 202 and a VCE detection circuit 203.
Taking the inverter circuit shown in fig. 1 as an example, when the motor controller is in normal operation, the amplifying circuit 201 is used to amplify the 6 channels of PWM signals output by the control circuit 100, so as to drive the corresponding switching tubes.
When the motor controller is started up for detection, the amplifying circuit 201 is used for amplifying the N shutdown execution signals output by the control circuit 100, and generating and outputting N driving signals; the acquisition circuit 202 is used for acquiring base state signals of the N switching tubes; the VCE detection circuit 203 is configured to collect two-end differential pressure detection signals of the N switching tubes, where the two-end differential pressure detection signals refer to a differential pressure VCE between a collector C and an emitter E of the switching tubes.
It should be noted that, when the reference ground of the control circuit 100 is different from that of the inverter circuit, the driving circuit 200 is further provided with an isolation module 204 between each circuit (the amplifying circuit 201, the collecting circuit 202, and the VCE detecting circuit 203) and the control circuit 100, for implementing signal isolation between the driving circuit and the control circuit 100.
It should be noted that, each circuit in the present embodiment is a circuit already provided in the existing driving circuit, and no additional hardware is required to be added to the control circuit 100 and the driving circuit 200; the method is simple and easy to implement without changing the hardware composition of the control circuit 100 and the driving circuit 200, as long as the original acquisition circuit 202 is used for acquiring base state signals of N switching tubes, the original VCE detection circuit 203 is used for acquiring differential pressure detection signals at two ends of the N switching tubes, and the microprocessor 101 is used for comparing the base state signals and the differential pressure detection signals at two ends of the N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state, and further judging whether a detection result of whether a turn-off path of the motor controller fails.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
Since the VCE detection circuit 203 is an existing circuit on the power side of the driving circuit 200, when the motor controller is in normal operation, as shown in fig. 1, the direct current Udc (about several hundred volts) provided by the high-voltage battery is supplied to the collector of the corresponding switching tube. When the switching tube is an IGBT, due to the characteristic that the larger the current flowing through the IGBT, the larger the voltage difference between the collector and the emitter, if a short-circuit fault occurs in a certain IGBT, the larger the current flowing through the IGBT, and the larger the voltage difference between the collector and the emitter, the larger the voltage difference detection signal between the two ends output by the VCE detection circuit 203 exceeds the corresponding threshold, and the microprocessor 101 detects that the short-circuit fault occurs.
Therefore, the prior art can already realize the detection function for the short-circuit fault of the switch tube, but cannot realize the detection function for the open-circuit fault of the switch tube, and in order to improve the coverage of the detection of the off path with lower cost influence, another embodiment of the present invention further provides another motor controller, on the basis of the above embodiment, preferably, N anti-reverse circuits 300 are additionally provided in the motor controller, fig. 3 shows only one switch tube and the anti-reverse circuit 300 thereof as an example, and the connection manner between the other switch tubes and the anti-reverse circuits 300 thereof is the same as that shown in fig. 3, and is not shown here one by one.
The output end of the anti-reverse circuit 300 is connected with the collector of the corresponding switch tube and the input end of the VCE detection circuit 203;
the input end of the anti-reverse circuit 300 is used for receiving the test power supply of the corresponding switch tube, and the test power supply is used for providing the forward conduction voltage of the corresponding switch tube.
Preferably, the anti-reverse circuit 300 includes: a resistor and a diode connected in series; the direction of the diode is the same as the direction from the input to the output of the anti-reverse circuit 300.
The main functions of the anti-reverse circuit 300 are current limiting and reverse prevention; specifically, when the switch tube to be tested is in a conducting state, the anti-reverse circuit 300 can divide the voltage of the test power supply received by the switch tube to avoid the overlarge current on the corresponding switch tube; during normal operation, the reverse connection preventing circuit 300 can prevent the direct current Udc provided by the high-voltage battery from flowing backwards.
In practical applications, the test supply may be derived from: the base electrode of the corresponding switch tube supplies power, or the high-voltage battery connected with the motor controller supplies power under a preset time sequence. Still alternatively, the motor controller employs an additional test power module 400 to generate the test supply, as shown in FIG. 3. Without limitation, and depending on the specific application, are within the scope of the present application.
If the test power supply is from the base power supply of the corresponding switch tube or the additional test power supply module 400, the high voltage battery does not provide the direct current Udc to the corresponding switch tube during the start-up detection of the motor controller, but the test power supply (about ten and several volts) is supplied to the collector of the corresponding switch tube through the anti-reverse circuit 300. If the test power supply is from the power supply of the high-voltage battery connected to the motor controller in the preset time sequence, the power supply voltage of the high-voltage battery in the preset time sequence is lower when the motor controller is started for detection, and the corresponding VCE detection circuit 203 can be triggered.
When the motor controller is in startup detection, if a certain switching tube is supposed to be conducted according to a driving signal of the switching tube, the voltage difference between a collector and an emitter of the switching tube is supposed to be relatively small, namely the voltage difference detection signal at two ends output by the VCE detection circuit 203 of the motor controller is supposed to be lower than a certain threshold; if the switch tube has an open circuit fault, the voltage difference between the collector and the emitter of the switch tube is slightly lower than the test power supply due to the function of the anti-reverse module 300, but the voltage difference detection signal at two ends output by the VCE detection circuit 203 is also higher than the threshold, and at this time, the microprocessor 101 in the control circuit 100 determines that the switch tube has an open circuit fault according to the voltage difference detection signal, so as to obtain a detection result that the off path of the motor controller has a fault.
The problem that the detection coverage of the turn-off path is low in the prior art can be solved only by adding the resistor and the diode in the embodiment, the influence on the layout of the printed circuit board of the driving circuit and the cost improvement is small, and the popularization is facilitated.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A motor controller, comprising: the control circuit, the drive circuit and the inverter circuit; the inverter circuit comprises N switching tubes, wherein N is a positive integer; the motor controller is when starting up:
the control circuit is used for generating and outputting N turn-off execution signals;
the drive circuit is used for generating and outputting N drive signals according to the N turn-off execution signals, so that the N switching tubes are respectively turned on or off according to the corresponding drive signals; the driving circuit is also used for collecting base state signals and two-end differential pressure detection signals of the N switching tubes and outputting the base state signals and the two-end differential pressure detection signals of the N switching tubes to the control circuit;
the control circuit is further used for comparing base state signals and two-end pressure difference detection signals of the N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state, if all comparison results are consistent with the corresponding expected outputs, judging that a turn-off path of the motor controller is normal, and otherwise, judging that the turn-off path of the motor controller fails.
2. The motor controller of claim 1, wherein the control circuit comprises: a microprocessor and a logic operation circuit; wherein:
the microprocessor is used for generating and outputting an active short circuit enabling signal; comparing base state signals and differential pressure detection signals at two ends of N switching tubes with 2N corresponding expected outputs when the motor controller enters a safe state respectively, if each comparison result is consistent with the corresponding expected output, judging that a turn-off path of the motor controller is normal, otherwise, judging that the turn-off path of the motor controller has a fault;
the logic operation circuit is used for generating and outputting N turn-off execution signals according to the active short circuit enable signal.
3. The motor controller according to claim 2, wherein the microprocessor is configured to compare base state signals and differential pressure detection signals of N switching tubes with 2N corresponding expected outputs of the motor controller when the motor controller enters a safe state, and if each comparison result is consistent with the corresponding expected output, determine that a shutdown path of the motor controller is normal, otherwise determine that the shutdown path of the motor controller has a fault, and specifically configured to:
comparing base state signals of N switching tubes with N corresponding expected outputs when the motor controller enters a safe state;
under the condition that each comparison result is consistent with the corresponding expected output, comparing the pressure difference detection signals at two ends of N switching tubes with the other N corresponding expected outputs when the motor controller enters a safe state respectively;
and if the comparison results of the two comparisons are consistent with the corresponding expected outputs, judging that the shutdown path of the motor controller is normal, otherwise, judging that the shutdown path of the motor controller has a fault.
4. The motor controller according to claim 2, wherein the microprocessor is configured to compare base state signals and differential pressure detection signals of N switching tubes with 2N corresponding expected outputs of the motor controller when the motor controller enters a safe state, and if each comparison result is consistent with the corresponding expected output, determine that a shutdown path of the motor controller is normal, otherwise determine that the shutdown path of the motor controller has a fault, and specifically configured to:
comparing base state signals of the N switching tubes with N corresponding expected outputs when the motor controller enters a safe state respectively; meanwhile, the pressure difference detection signals at two ends of N switching tubes are respectively compared with the other N corresponding expected outputs when the motor controller enters a safe state;
and if all the comparison results are consistent with the corresponding expected outputs, judging that the shutdown path of the motor controller is normal, otherwise, judging that the shutdown path of the motor controller has a fault.
5. The motor controller of claim 2, wherein the control circuit further comprises: the system comprises a system monitoring chip, a sampling circuit and a communication circuit;
the system monitoring chip, the sampling circuit and the communication circuit are all connected with the microprocessor.
6. The motor controller of claim 1, wherein the drive circuit comprises: the device comprises an amplifying circuit, an acquisition circuit and a VCE detection circuit; wherein:
the amplifying circuit is used for generating and outputting N driving signals according to the N turn-off executing signals;
the acquisition circuit is used for acquiring base state signals of the N switching tubes;
the VCE detection circuit is used for collecting the voltage difference detection signals at the two ends of the N switching tubes.
7. The motor controller of claim 6, wherein said drive circuit further comprises: and one side of the isolation module is connected with the control circuit, and the other side of the isolation module is respectively connected with the amplifying circuit, the acquisition circuit and the VCE detection circuit.
8. The motor controller of claim 6, further comprising: n anti-reverse circuits;
the output end of the anti-reverse circuit is connected with the collector of the corresponding switch tube and the input end of the VCE detection circuit;
the input end of the anti-reverse circuit is used for receiving test power supply of the corresponding switch tube.
9. The motor controller of claim 8 wherein said test supply is derived from: the base electrode of the corresponding switch tube supplies power, or the high-voltage battery connected with the motor controller supplies power under a preset time sequence; or,
the motor controller further includes: and the test power supply module is used for generating the test power supply.
10. A motor controller according to claim 8 or 9, wherein the anti-kickback circuit comprises: a resistor and a diode connected in series;
the direction of the diode is the same as the direction from the input end to the output end of the anti-reverse circuit.
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| CN111717031B (en) * | 2020-06-08 | 2022-04-01 | 重庆长安新能源汽车科技有限公司 | Pure electric vehicle torque function safety monitoring method and system and vehicle |
| CN113479065B (en) * | 2021-07-29 | 2023-01-10 | 中国第一汽车股份有限公司 | Motor active short circuit control circuit and driving method thereof |
| CN114185291B (en) * | 2021-12-02 | 2023-07-11 | 杭州和利时自动化有限公司 | Output control system |
| CN118483581A (en) * | 2024-04-23 | 2024-08-13 | 上海谭慕半导体科技有限公司 | Motor driver open circuit detection device and method, and readable storage medium |
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