CN115275931A - Active short circuit control circuit, device thereof, control method and system thereof, and vehicle - Google Patents

Active short circuit control circuit, device thereof, control method and system thereof, and vehicle Download PDF

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Publication number
CN115275931A
CN115275931A CN202210843074.6A CN202210843074A CN115275931A CN 115275931 A CN115275931 A CN 115275931A CN 202210843074 A CN202210843074 A CN 202210843074A CN 115275931 A CN115275931 A CN 115275931A
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China
Prior art keywords
circuit
active short
signal
module
voltage
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CN202210843074.6A
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Chinese (zh)
Inventor
王圣斌
黄荣华
朱占山
王忠禹
钟华
刘志强
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FAW Group Corp
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FAW Group Corp
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Priority to CN202210843074.6A priority Critical patent/CN115275931A/en
Publication of CN115275931A publication Critical patent/CN115275931A/en
Priority to PCT/CN2023/088969 priority patent/WO2024016759A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention discloses an active short circuit control circuit, a device, a control method, a system and a vehicle thereof, wherein the circuit is powered by a whole vehicle low-voltage power supply and a whole vehicle bus, and the active short circuit control circuit specifically comprises the following steps: the microcontroller is used for outputting a motor control signal; there is the drive module in electric connection between power module and microcontroller, still includes: the device comprises a microcontroller monitoring module, an overvoltage monitoring module and an active short circuit processing module. The active short circuit control circuit is improved, the active short circuit state can be triggered when any one of the two conditions of microcontroller failure and bus voltage overvoltage occurs, whether the low-voltage side circuit fails or not is completely not required to be considered, when the microcontroller fails to cause motor control signals to be invalid, and when the microcontroller is abnormal in software failure, power failure and the like, a failure signal is sent to the active short circuit processing module, so that irreversible damage of a whole vehicle system caused by overhigh reverse electromotive force is avoided.

Description

Active short circuit control circuit, device thereof, control method and system thereof, and vehicle
Technical Field
The invention relates to a control circuit, a device, a control method and a system thereof, and a vehicle, in particular to an active short circuit control circuit, a device, a control method and a system thereof, and a vehicle.
Background
In an electric vehicle power system, an Intelligent Power Unit (IPU) is a core component in an electric drive system, and performs direct-alternating current high-power electric energy conversion, so that the motor can be driven to output torque, and the braking energy can be absorbed from the motor to charge a battery. The IPU is composed of a main loop composed of a power module, a driving unit, a bus capacitor and a copper bar. The power module is a core component for electric energy conversion, and the driving unit converts a low-voltage control signal of the control unit into a high-voltage signal for driving the power module, and is a unit for directly controlling the module to perform electric energy conversion. The reliability of the driving unit influences the safety of the whole vehicle, and whether the driving unit can control the power module to work safely and effectively is an important index of a vehicle functional safety system.
When the traditional protection circuit detects that the motor breaks down, the motor is controlled to enter a safe state. The safety states of the motor in general include two types, one is to directly place all power switching devices in an open state (FreeWheeling, FW); the other is to place the half-bridge of the power switch device in open Circuit and place the opposite half-bridge in Short Circuit, also called Active Short Circuit (ASC). When the motor rotates at a high speed, the motor is controlled to enter an ASC safe state to avoid generation of a reverse electromotive force, and when the motor rotates at a low speed, the motor is controlled to enter an FW state. When the electric vehicle runs at a high speed, once the control and driving unit of the inverter of the electric driving system breaks down, the motor needs to be controlled to enter an active short-circuit state in order to avoid irreversible damage to the whole vehicle system caused by overhigh reverse electromotive force. However, the current active short state trigger mode has various defects, such as:
when the driving unit or the module has a working fault (such as bus voltage overvoltage, module overvoltage or overcurrent, and failure of the driving chip), the driving unit outputs a fault signal to the control unit, and then the control unit sends an active short-circuit signal to the driving unit and inputs the active short-circuit signal to the low-voltage side of the driving chip, so that the driving module enters an active short-circuit state.
When the low-voltage control power supply of the whole vehicle is broken, the low-voltage side and the high-voltage side of the driving chip lose power supply, so that the motor loses a control signal. At the moment, the motor is in a generator state of energy feedback and has higher back electromotive force. At this time, the backup power circuit is required to get power from the bus voltage to supply power to the high-voltage side of the driving chip, and the driving module enters an active short-circuit state.
The two working conditions respectively correspond to active short circuit control of the low-voltage side and the high-voltage side, the priority of active short circuit of the high-voltage side is higher than that of active short circuit of the low-voltage side, and active short circuit signals of the low-voltage side are triggered by a microcontroller of the control unit. In the prior art, when a microcontroller itself fails, a motor control signal is invalid, and an active short circuit control signal cannot be obtained on a high-voltage side, or an active short circuit is triggered on a low-voltage side of a driving chip, so that a certain time delay exists, and in addition, a delay circuit exists in topology, so that a fault response is slow in a circuit structure.
Disclosure of Invention
The invention aims to provide an active short circuit control circuit, a device, a control method, a system and a vehicle thereof, and aims to solve the technical problems that an active short circuit signal is triggered through a microcontroller, so that the reliability and the safety of a driving unit and a power module are ensured, and the safety of the whole vehicle is further ensured;
the invention solves the technical problem that an isolation driving power supply and a backup power supply module are arranged in an active short-circuit control circuit, and the backup power supply is provided when a low-voltage system is powered down or the isolation driving power supply module fails, so that the active short-circuit control circuit can continuously realize the function of controlling the active short-circuit of the motor;
another technical problem to be solved by the present invention is to provide a vehicle with an active short circuit control function, wherein when a motor of the vehicle encounters working conditions such as a failure of a driving \ power module, an overvoltage of a bus voltage, and an abnormal operation of a microcontroller, the motor can enter an active short circuit safety state in time, so as to prevent a vehicle system from being damaged due to an excessively high back electromotive force.
The invention provides the following scheme:
the utility model provides an initiative short-circuit control circuit, initiative short-circuit control circuit supplies power through whole car low voltage power supply and whole car generating line, specifically includes:
the power module controls the state of a switch device of the power module to realize the control of the motor;
the microcontroller is used for outputting a motor control signal;
the driving module is electrically connected between the power module and the microcontroller, and is used for carrying out photoelectric isolation and signal amplification on a control signal output by the microcontroller and then sending the control signal to the power module;
further comprising:
the microcontroller monitoring module is used for monitoring the running state of the microcontroller in real time and sending an abnormal signal to the active short-circuit processing module when the microcontroller is abnormal;
the overvoltage monitoring module is used for monitoring the bus voltage in real time and outputting a voltage division signal of the bus voltage to the active short-circuit processing module;
the active short-circuit processing module is respectively connected with the driving module, the microcontroller monitoring module and the overvoltage monitoring module, receives monitoring signals from the microcontroller monitoring module and partial pressure signals of bus voltage from the overvoltage monitoring module, and outputs digital signals for controlling an active short-circuit state to the driving module after signal processing.
Further, the method also comprises the following steps:
the isolation driving power supply is used for converting the voltage of a low-voltage system of the whole vehicle into high-voltage driving voltage and supplying power for the driving high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module;
and the backup power supply module is used for taking power through the bus voltage, and when the low-voltage system is powered down or the isolation driving power supply module fails, the backup power supply module is used for supplying power to the driving high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module respectively.
Further, the active short-circuit processing module isolates a low-voltage signal sent by the microcontroller monitoring module and converts the low-voltage signal into a high-voltage side signal, and detects whether the bus voltage exceeds a safety threshold value according to a voltage division signal of the bus voltage;
the active short circuit processing module specifically comprises: isolation module, signal processing module, buffer, comparator and OR gate, wherein:
the isolation module is used for receiving the monitoring signal sent by the microcontroller monitoring module, isolating the monitoring signal from a low-voltage signal, converting the monitoring signal into a high-voltage side signal and outputting the high-voltage side signal to the signal processing module;
the signal processing module receives the high-voltage side signal for identification and monitoring from the signal processing module and sends a digital signal for controlling an active short-circuit state to one end of the OR gate;
the buffer receives a voltage division signal of bus voltage from the overvoltage monitoring module, performs impedance matching and transmits the voltage division signal to the comparator;
the comparator sends an active short circuit control signal to the other end of the OR gate when the voltage division signal of the bus voltage exceeds a threshold value;
and when one of the microcontroller and the bus voltage is abnormal, the OR gate sends an active short-circuit signal to the driving high-voltage side circuit, and then the high-voltage side circuit drives the power module.
Furthermore, the isolation module is a photoelectric coupler, the anode of a light emitting diode in the photoelectric coupler is a working state signal input end of the microcontroller, the cathode of the light emitting diode is grounded, the collector of a phototriode corresponding to the light emitting diode is connected with the anode of a first diode, the emitter of the phototriode is grounded, one end of a first capacitor and one end of a first resistor are respectively connected between the in-phase ends of the first diode and a second comparator, the other end of the first capacitor and the other end of the first resistor are grounded, the reverse phase end of a second comparator is connected with a high level, the reverse phase end of a third comparator is connected between the in-phase ends of the first diode and the second comparator, the in-phase end of the third comparator is connected with a low level, the output ends of the second comparator and the third comparator are respectively connected with two input ends of a fourth or gate, the output end of the fourth or gate is connected with one input end of a fifth or gate, and the output end of the fifth or gate is an active short-circuit signal end.
Furthermore, the buffer comprises a sixth operational amplifier, a second resistor and a second capacitor, wherein the in-phase end of the sixth operational amplifier is connected with one end of the second resistor, the other end of the second resistor is connected with the input end of the overvoltage monitoring signal, the inverting end of the sixth operational amplifier is connected with the output end, the output end of the sixth operational amplifier is further connected with one end of a third resistor, the other end of the third resistor is connected with the in-phase end of the seventh operational amplifier, a fourth resistor is connected between the in-phase end and the output end of the seventh operational amplifier, the inverting end of the seventh operational amplifier is used for setting equivalent threshold voltage, the output end of the seventh operational amplifier is connected with the other input end of the fifth or gate, and the output end of the fifth or gate is an active short-circuit signal end.
The active short circuit control device is provided with the active short circuit control circuit.
An active short circuit control method specifically comprises the following steps:
detecting whether the driving module or the power module has a fault, and sending an active short-circuit signal or maintaining the original state to work normally according to the existence of the fault;
judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal work of the original state;
and detecting the working state of the microcontroller, and sending an active short-circuit signal or maintaining the original state to work normally.
Further, the method specifically comprises the following steps:
whether a fault exists in the driving module or the power module is detected, if the fault exists, the driving module sends a fault signal to the microcontroller, the microcontroller identifies and reports the whole vehicle and then sends an active short-circuit signal to the driving module, and the motor enters an active short-circuit safety state, or: if no fault exists, the original state is maintained to normally work;
judging whether the bus voltage is overvoltage, and if the bus voltage is not overvoltage, maintaining the original state to normally work; if the bus voltage is overvoltage, an active short-circuit signal is sent to the driving high-voltage circuit by the active short-circuit processing module, and whether the bus voltage is discharged to be lower than the turn-off threshold voltage or not is further judged: if the bus voltage is discharged to be lower than the turn-off threshold voltage, the active short-circuit processing module stops sending the active short-circuit signal; if the bus voltage discharge is not lower than the turn-off threshold voltage, the active short-circuit processing module continues to send an active short-circuit signal;
judging whether the microcontroller works normally, if the microcontroller works normally, maintaining the original state to work normally, or: when the microcontroller works abnormally, the active short-circuit processing module sends an active short-circuit signal to the driving high-voltage circuit.
An active short circuit control system specifically comprises:
the driving/power module fault detection unit is used for detecting whether the driving module or the power module has a fault or not, and sending an active short-circuit signal or maintaining the normal operation of the original state;
the bus voltage overvoltage detection unit is used for judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal operation of the original state;
and the microcontroller state detection unit is used for sending an active short-circuit signal or maintaining the original state to normally work according to the working state of the microcontroller.
An electronic device, comprising: the system comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus; the memory has stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the method.
A computer-readable storage medium storing a computer program executable by an electronic device, the computer program, when run on the electronic device, causing the electronic device to perform the steps of a method.
A vehicle having an active short circuit control system disposed thereon for controlling a motor to enter an active short circuit state when a control and drive unit of an electric drive system inverter of the vehicle fails, further comprising:
an electronic device for implementing an active short circuit control method;
a processor that runs a program, and executes a step of an active short control method from data output from the electronic device when the program is run;
a storage medium for storing a program which, when executed, performs the steps of the active short-circuit control method on data output from an electronic device.
Compared with the prior art, the invention has the following advantages:
through improving initiative short circuit control circuit, can trigger initiative short circuit state when arbitrary condition takes place under microcontroller trouble and bus voltage overvoltage two kinds of circumstances, and needn't consider low-voltage side circuit whether to break down completely, when microcontroller breaks down itself and leads to motor control signal invalid, microcontroller's monitoring unit directly sends initiative short circuit control signal for the high-voltage side, has avoided the too high irreversible damage that arouses whole car system of reverse electromotive force.
The active short-circuit control circuit is provided with an isolation driving power supply and a backup power supply module, wherein the isolation driving power supply is used for converting the voltage of a low-voltage system of the whole vehicle into high-voltage driving voltage and is used for driving the high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module. When the low-voltage system is powered off or the isolation driving power supply module fails, the backup power supply module gets electricity through the bus voltage, and the backup power supply module respectively supplies power to the driving high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module, so that the active short-circuit control circuit can continuously realize the function of controlling the active short circuit of the motor.
According to the active short circuit control method and system based on the active short circuit, disclosed by the invention, an active short circuit signal can be sent according to control logic judgment factors such as whether a driving module and a power module are in fault, whether the bus voltage is overvoltage, whether a microcontroller works normally and the like, a motor is controlled to enter an active short circuit safety state in time, and the damage to a whole vehicle system caused by overhigh reverse electromotive force is prevented.
When the motor of the vehicle encounters working conditions such as driving \ power module faults, bus voltage overvoltage, abnormal working of a microcontroller and the like, the motor can enter an active short-circuit safety state in time, and damage to a vehicle system caused by overhigh reverse electromotive force is prevented.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a functional block diagram of an active short control circuit.
Fig. 2 is a functional block diagram of an active short processing module.
Fig. 3 is a circuit schematic of an active short processing module.
Fig. 4 is a flow chart of an active short control method.
Fig. 5 is an architecture diagram of an active short control system.
Fig. 6 is (one of) a flow chart of an active short control method in one possible embodiment.
Fig. 7 is a flow chart of the active short control method (two) in one possible embodiment.
Fig. 8 is a flow chart of the active short control method in one possible embodiment (three).
Fig. 9 is a system architecture diagram of an electronic device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
As shown in fig. 1, the active short-circuit control circuit supplies power through a whole vehicle low-voltage power supply and a whole vehicle bus, and specifically includes:
the power module 180 controls the motor by controlling the state of a switching device of the power module;
microcontroller 100, is used for outputting motor control signal, carries out active short circuit control to the motor, and the exemplary: the microcontroller 100 receives the vehicle command and outputs a motor control signal to the driving module 110.
The driving module 110, the driving module 110 is electrically connected between the power module 180 and the microcontroller 100, and the driving module 110 is used for performing photoelectric isolation and signal amplification on a control signal output by the microcontroller 100 and then sending the control signal to the power module 180;
the following are exemplary: when the input end is electrified, the light emitter emits light, and the light receiver receives the light, then photocurrent is generated and flows out from the output end, thereby realizing 'electro-optic-electro' conversion. The light is used as medium to couple the input end signal to the output end, and the device has the advantages of no contact, strong anti-interference capability, insulation between the output and the input, unidirectional signal transmission and the like.
The driving module 110 includes an upper three-bridge driving circuit and a lower three-bridge driving circuit, each of which is divided into a low-voltage side circuit and a high-voltage side circuit, and when the electric driving system works normally, the low-voltage side circuit supplies power through a low-voltage power supply, and the high-voltage side circuit supplies power through an isolation driving power supply.
The microcontroller monitoring module 120 is configured to monitor an operating state of the microcontroller 100 in real time, and send an abnormal signal to the active short-circuit processing module 150 when the microcontroller 100 is abnormal, which is as follows: the microcontroller monitoring module 120 monitors the operating state of the microcontroller 100, and sends a fault signal to the active short-circuit processing module 150 when the microcontroller is abnormal, such as software failure or power failure.
The overvoltage monitoring module 130 is configured to monitor the bus voltage in real time, and output a voltage division signal of the bus voltage to the active short circuit processing module 150 according to a principle of resistance voltage division; as will be understood by those skilled in the art, the signal voltage output by the voltage divider circuit is sent to the next stage circuit, and in theory, the input end of the next stage circuit of the voltage divider circuit is the output end of the voltage divider circuit.
The active short-circuit processing module 150, the active short-circuit processing module 150 is respectively connected to the driving module 110, the monitoring module of the microcontroller 100 and the overvoltage monitoring module 130, the active short-circuit processing module 150 receives the monitoring signal from the monitoring module 120 of the microcontroller and the voltage dividing signal of the bus voltage from the overvoltage monitoring module 130, and outputs a digital signal for controlling the active short-circuit state to the driving module 110 after signal processing.
The main circuit of the active short circuit control circuit has the working principle that:
when the voltage supply of the whole vehicle is normal, the microcontroller 100, the low-voltage side circuit of the driving module 110 and the microcontroller monitoring module 120 are all powered by a low-voltage power supply; the high-voltage side circuit of the driving module 110, the overvoltage monitoring module 130 and the active short-circuit processing module 150 are all powered by a low-voltage power supply through the isolated driving power supply module 190.
When the low voltage of the whole vehicle is powered down or the isolated driving power supply module 190 is disconnected, the backup power supply module 170 supplies power to the driving high voltage side circuit 160, the overvoltage monitoring module 130 and the active short circuit processing module 150 of the driving module.
The overvoltage monitoring module 130 monitors the bus voltage in real time, and outputs a voltage division signal of the bus voltage to the active short-circuit processing module 150 according to a principle of resistance voltage division;
the active short-circuit processing module 150 receives the monitoring signal from the microcontroller monitoring module 120 and the voltage dividing signal of the bus voltage from the overvoltage monitoring module 130, and outputs a digital signal for controlling the active short-circuit state to the driving module 110 after signal processing, so as to adjust the switching tube in the power module 180 and control the motor to enter the active short-circuit safety state, and the ASC signal for controlling the active short-circuit state, which is output by the active short-circuit processing module 150, has a higher priority, thereby covering the control of the driving module 110 by the microcontroller 100.
Preferably, the method further comprises the following steps:
the isolation driving power supply module 190 is used for converting the voltage of the low-voltage system of the whole vehicle into a high-voltage driving voltage to supply power for the driving high-voltage side circuit 160, the active short-circuit processing module 150 and the overvoltage monitoring module 130;
and the backup power supply module 170 is used for taking power through the bus voltage, and when the low-voltage system is powered down or the isolation driving power supply module 190 fails, the backup power supply module respectively supplies power to the driving high-voltage side circuit 160, the active short-circuit processing module 150 and the overvoltage monitoring module 130. Due to the existence of the backup power module 170, even if the low-voltage system is powered down or the isolation driving power module 190 fails, the backup power module 170 can respectively supply power to the driving high-voltage side circuit 160, the active short-circuit processing module 150 and the overvoltage monitoring module 130, so that the system is ensured to realize the active short-circuit function.
The functional block diagram of the active short processing module 150 shown in fig. 2:
the active short processing module 150 comprises an isolation module 151, a signal processing module 152, a buffer 153, a comparator 154 and an or-gate 155, wherein:
the isolation module 151 receives the monitoring signal sent by the microcontroller monitoring module 120, isolates the monitoring signal from a low-voltage signal, converts the monitoring signal into a high-voltage side signal, and outputs the high-voltage side signal to the signal processing module 152;
a signal processing module 152 for receiving the high-voltage side signal for identification and monitoring from the signal processing module and sending a digital signal for controlling an active short-circuit state to one end of the or gate 155;
a buffer 153 for receiving the divided voltage signal of the bus voltage from the overvoltage monitoring module 130, performing impedance matching, and transmitting the divided voltage signal to the comparator 154; if the buffer 153 is not provided and the overvoltage monitoring module 130 is directly connected to the comparator 154, the resistance inside the comparator 154 may affect the divided voltage value.
And a comparator 154, wherein when the divided signal of the bus voltage exceeds a threshold value, the comparator 154 sends an active short circuit control signal to the other end of the or gate 155.
When one of the microcontroller and the bus voltage is abnormal, the or gate 155 sends an active short-circuit signal to the driving high-voltage side circuit 160, and then the driving high-voltage side circuit 160 drives the power module 180, so that the motor is controlled.
As shown in the schematic circuit diagram of the active short-circuit processing module 150 in fig. 3, vmon is a working state signal of the microcontroller, and the Vmon signal is connected to a photocoupler U1 (isolation optocoupler). The signal processing module 152 includes a first resistor R1, a first diode D1, a first capacitor C1, a second comparator U2, a third comparator U3, and a fourth or gate U4. The positive electrode of the first diode D1 is connected to the output end of the photoelectric coupler U1, the first resistor R1 and the first capacitor C1 are connected in parallel between the negative electrode of the first diode D1 and the ground, that is, the output end of the photoelectric coupler U1 is connected to the in-phase end of the second comparator U2 and the inverting end of the third comparator U3, the output ends of the two comparators are respectively used as two inputs of the fourth or gate U4, and the output end of the fourth or gate U4 is the output of the signal processing module 152.
The functional block diagram of the active short processing module 150 shows the circuit connection relationship between the specific circuit components: the isolation module 151 is a photoelectric coupler U1, the anode of a light emitting diode in the photoelectric coupler U1 is an input end of a microcontroller working state signal Vmon, the cathode of the light emitting diode is grounded, the collector of a phototriode corresponding to the light emitting diode is connected with the anode of a first diode D1, the emitter of the phototriode is grounded, one ends of a first capacitor C1 and a first resistor R1 are respectively connected between the same-phase ends of the first diode D1 and a second comparator U2, the other ends of the first capacitor C1 and the first resistor R1 are grounded, the reverse-phase end of the second comparator U2 is connected with a high level, the reverse-phase end of a third comparator U3 is connected between the same-phase ends of the first diode D1 and the second comparator U2, the same-phase end of the third comparator U3 is connected with a low level, the output ends of the second comparator and the third comparator are respectively connected with two input ends of a fourth or gate U4, the output end of the fourth or gate U4 is connected with one input end of a fifth or gate U5, and the output end of the fifth or gate U5 is a short-circuit signal.
The buffer 153 includes a sixth operational amplifier U6, a second resistor R2, and a second capacitor C2, wherein the non-inverting terminal of the sixth operational amplifier U6 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the overvoltage monitoring signal input terminal VdcAnd the inverting end of the U6 is connected with the output end, the output end of the U6 is also connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the inverting end of a seventh operational amplifier U7, a fourth resistor R4 is connected between the inverting end and the output end of the seventh operational amplifier U7, the inverting end of the seventh operational amplifier U7 is used for setting an equivalent threshold voltage, the output end of the seventh operational amplifier U7 is connected with the other input end of a fifth OR gate U5, and the output end of the fifth OR gate U5 is an active short-circuit signal end.
Description of the circuit principle of the active short processing module 150: the Vmon signal is a square wave signal with a variable duty cycle, which is 50% of the duty cycle when the microcontroller is operating normally. When the microcontroller is abnormally operated, the duty cycle of the Vmon signal changes. If the low voltage is powered down, the Vmon signal is also powered down, which is equivalent to a signal with a duty ratio of 0. After the Vmon signal is isolated by the photoelectric coupler U1, the first capacitor C1 is charged through the first diode D1. The first diode D1 has the effect that when the Vmon signal is 0, the first capacitor C1 can all discharge through the first resistor R1, and by reasonably setting the values of the first capacitor C1 and the first resistor R1, when the Vmon signal duty ratio is 50%, the voltage of the first capacitor C1 can be kept in the range of Vh and Vl, and at this time, the second comparator U2 and the third comparator U3 both output "0". Once the Vmon signal duty cycle changes, the voltage of the first capacitor C1 will exceed the Vh and Vl ranges, and one of the second comparator U2 and the third comparator U3 will output "1", thereby initiating an active short circuit.
VdcThe signal is an analog level signal obtained by dividing the bus voltage. VdcThe signal is first input to a second resistor R2 andthe second capacitor C2 forms a low-pass filter circuit to prevent some voltage spikes from causing false open active short circuit, and then the voltage spikes are input to the comparator 154 after passing through the sixth operational amplifier U6, and the sixth operational amplifier U6 functions to prevent the filter from affecting the input impedance of the comparator. The seventh comparator U7, the third resistor R3, and the fourth resistor R4 constitute a hysteresis comparator, and appropriate high and low voltage threshold resistors Vth (h) and Vth (l) can be obtained by designing the resistances of the threshold voltage Vth, the third resistor R3, and the fourth resistor R4. During the process that the input voltage of the comparator is increased from 0 to Vth (h), namely the process that the bus voltage is increased from 0V to the overvoltage threshold value, the seventh operational amplifier U7 outputs '0'; after the bus voltage exceeds a threshold value, the seventh operational amplifier U7 outputs '1', and an active short circuit is started; when the bus voltage is reduced to a turn-off threshold value along with the reduction of the counter electromotive force of the motor, namely the relatively strong input voltage is reduced to be lower than Vth (l), the seventh operational amplifier U7 outputs '0', and the active short circuit is closed.
In summary, as long as the microcontroller 100 monitors the abnormal condition of the signal Vmon or the overvoltage monitoring signal Vdc, the or gate 155 can output the active short-circuit signal, so as to realize the active short-circuit function.
The invention discloses an active short circuit control circuit, and also discloses a corresponding active short circuit control device, wherein the active short circuit control circuit is arranged in the active short circuit control device, the active short circuit control device works at the high-voltage side of a drive unit, an active short circuit state can be triggered under the condition that a microcontroller fails or bus voltage is overvoltage, whether the low-voltage side circuit fails or not is not considered at all, the active short circuit module 150 in the device does not interfere the connection between the microcontroller 100 and the drive module 110, the ASC signal output by the active short circuit module 150 has higher priority, the control action of the microcontroller 100 on the drive module 110 is covered, and the effect that the priority of the active short circuit control at the high-voltage side is higher than that of the active short circuit control at the low-voltage side is realized.
As shown in fig. 4, the present invention discloses an active short circuit control method corresponding to an active short circuit control circuit and a device thereof, and the method specifically includes the following steps:
detecting whether the driving module or the power module has a fault, and sending an active short-circuit signal or maintaining the original state to work normally according to the existence of the fault;
judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal work of the original state;
and detecting the working state of the microcontroller, and sending an active short-circuit signal or maintaining the original state to work normally.
In the active short circuit control method disclosed in this embodiment, a person skilled in the art can determine or detect whether a fault exists in the driving module or the power module, determine whether the bus voltage is overvoltage, and detect the operating state of the microcontroller by using his or her common technical knowledge or technical common knowledge in the art and combining the disclosure of the present disclosure.
For the purposes of simplicity of description, the method steps disclosed in the present embodiment are described as a series of acts, but those skilled in the art will appreciate that the present embodiment is not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the present embodiment. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
As shown in fig. 5, the active short circuit control system architecture diagram specifically includes:
the driving/power module fault detection unit is used for detecting whether the driving module or the power module has a fault or not, and sending an active short-circuit signal or maintaining the normal operation of the original state;
the bus voltage overvoltage detection unit is used for judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal operation of the original state;
a microcontroller state detection unit for sending active short circuit signal or maintaining the original state normal according to the working state of the microcontroller
It should be noted that, although only the fault detection unit of the driving/power module, the overvoltage detection unit of the bus voltage and the status detection unit of the microcontroller are disclosed in the present system, the composition of the present system is not limited to the above basic functional units, but rather, the present invention is to be expressed in the meaning that one skilled in the art can add one or more functional units on the basis of the above basic functional units, to form an infinite number of embodiments or technical solutions, in combination with the prior art, that is, the present system is open rather than closed, and the protection scope of the present invention claims is considered to be limited to the disclosed basic functional units because the present embodiment only discloses individual basic functional modules. Meanwhile, for convenience of description, the above devices are described as being divided into various units and modules by functions, respectively. Of course, the functions of the units and modules may be implemented in one or more software and/or hardware when implementing the invention.
The above-described system is only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
As shown in fig. 6 to 8, this embodiment shows how the active short circuit control method is implemented in a specific application scenario by detecting whether the driving/power module has a fault, determining whether the bus voltage is overvoltage, and whether the microcontroller operates normally, specifically:
as shown in fig. 6, step S300: detecting whether the driving module or the power module has a fault, and if so, executing step S310: the drive module sends the fault signal to microcontroller, and microcontroller discernment sends initiative short circuit signal to drive module after reporting whole car, and the motor gets into initiative short circuit safe state, or: if no fault exists, executing step S320 to maintain the normal operation of the original state;
as shown in fig. 7, step S330: judging whether the bus voltage is overvoltage, if the bus voltage is not overvoltage, executing a step S370, and maintaining the normal operation of the original state; if the bus voltage is overvoltage, step S340 is executed, the active short-circuit processing module sends an active short-circuit signal to the driving high-voltage circuit, and step S350 is executed to further determine whether the bus voltage is discharged to be lower than the turn-off threshold voltage: if the bus voltage is discharged to be lower than the turn-off threshold voltage, executing step S360, and stopping sending an active short-circuit signal by the active short-circuit processing module; if the bus voltage discharge is not lower than the turn-off threshold voltage, the active short-circuit processing module continues to send an active short-circuit signal;
as shown in fig. 8, step S380: judging whether the microcontroller works normally, if the microcontroller works normally, executing the step S400 to maintain the normal work of the original state, or: if the microcontroller works abnormally, step S400 is executed, and the active short-circuit processing module sends an active short-circuit signal to the driving high-voltage circuit.
Based on the circuit principle of the active short circuit control circuit and the control logic of the control method, the invention provides four different working modes:
MODE 1 (Normal working MODE)
When the low voltage of the entire vehicle system and the bus voltage are both in the normal working range, the entire vehicle low voltage system supplies power to the microcontroller 100, the microcontroller monitoring module 120 and the driving low voltage side circuit 140, and the low voltage supplies power to the driving high voltage side circuit 160, the active short circuit processing module 150 and the overvoltage monitoring module 130 after voltage isolation conversion is performed on the low voltage by the isolation driving power supply module 190. In this mode, the microcontroller 100 sends a PWM signal to the driving module 110, the driving module 110 outputs a high voltage driving signal to the power module 180, and the motor operates normally. Meanwhile, the driving module 110 constantly monitors the states of itself and the power module 180, the microcontroller monitoring module 120 constantly monitors the state of the microcontroller, and the overvoltage monitoring module 130 constantly monitors the bus voltage.
MODE 2 (failure of drive module or power module)
In this mode, the power supply of the entire vehicle is normal, but when the driving module 110 or the power module 180 fails (such as a damaged driving chip, an overvoltage or overcurrent of the power module), the driving module 110 sends a failure signal to the microcontroller 100, the microcontroller 100 identifies and reports the entire vehicle and then sends an active short-circuit signal to the driving module 110, and the motor enters an active short-circuit safety state.
MODE 3 (overvoltage failure)
When the bus voltage exceeds the safety threshold, the divided signal of the bus voltage output by the overvoltage monitoring module 130 also exceeds the safety threshold. Once the signal output from the buffer 153 is greater than the safe threshold voltage of the comparator 154, the comparator outputs an active short control signal to the or gate 155. In the active short-circuit state, the bus voltage gradually decreases with the discharge of the motor, and the switching tube of the power module 180 enters a linear amplification mode to generate a large amount of heat. Therefore, it is necessary to set the off threshold voltage in the design of the comparator 154, and the active short state is exited when the signal output from the buffer 153 is smaller than the off threshold voltage.
MODE 4 (microcontroller fault)
When the entire vehicle is powered off at low voltage, or the microcontroller has a hardware fault, or the software fails, the microcontroller monitoring module 120 sends a fault signal to the active short-circuit processing module 150. If low-voltage power failure occurs, the microcontroller 100, the driving low-voltage side circuit 140 and the isolation driving power supply module 190 are powered by no power supply, and at the moment, the backup power supply 170 supplies power to the driving high-voltage side circuit 160 and the active short-circuit processing module 150. When the microcontroller monitoring module 120 sends a fault signal to the active short-circuit processing module 150, the signal is first converted into a high-side signal by the isolation module 151, and the signal processing module 152 identifies the signal. Once an abnormality occurs in the signal, the signal processing module 152 sends an active short control signal to the or gate 155, so that the motor enters an active short state.
As shown in fig. 9, the present invention also discloses an electronic device and a storage medium corresponding to the active short circuit control circuit, the apparatus, the control method, and the system thereof:
an electronic device, comprising: the system comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; the memory has stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the active short-circuit control method.
A computer-readable storage medium storing a computer program executable by an electronic device, which when run on the electronic device causes the electronic device to perform the steps of an active short-circuit control method.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The electronic device includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a Memory. The operating system may be any one or more computer operating systems that implement control of the electronic device through a Process (Process), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, a windows operating system, or various vehicle-mounted operating systems, vehicle-mounted central control systems, and so on.
The execution main body of the electronic device control in the embodiment of the present invention may be the electronic device, or a functional module capable of calling a program and executing the program in the electronic device. The electronic device may acquire the firmware corresponding to the storage medium, the firmware corresponding to the storage medium is provided by a vendor, and the firmware corresponding to different storage media may be the same or different, which is not limited herein. After the electronic device acquires the firmware corresponding to the storage medium, the firmware corresponding to the storage medium may be written into the storage medium, specifically, the firmware corresponding to the storage medium is burned into the storage medium. The process of burning the firmware into the storage medium can be realized by adopting the prior art, and details are not described in the embodiment of the present invention.
The electronic device may further acquire a reset command corresponding to the storage medium, where the reset command corresponding to the storage medium is provided by a vendor, and the reset commands corresponding to different storage media may be the same or different, and are not limited herein.
At this time, the storage medium of the electronic device is a storage medium in which the corresponding firmware is written, and the electronic device may respond to the reset command corresponding to the storage medium in which the corresponding firmware is written, so that the electronic device resets the storage medium in which the corresponding firmware is written according to the reset command corresponding to the storage medium. The process of resetting the storage medium according to the reset command can be implemented by the prior art, and is not described in detail in the embodiment of the present invention.
The invention also discloses a vehicle, in particular to an electric vehicle, which is provided with an active short circuit control system, when the control and drive unit of the inverter of the electric drive system of the vehicle breaks down, the active short circuit control system is used for controlling the motor to enter an active short circuit state, and the invention also comprises:
an electronic device for implementing an active short circuit control method;
a processor which runs a program, and executes a step of the active short circuit control method from data output from the electronic device when the program runs;
a storage medium for storing a program which, when executed, performs the steps of the active short control method on data output from the electronic device.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, vehicle manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The following description is of the preferred embodiment for carrying out the invention, but the description is made for the purpose of general principles of the specification and is not intended to limit the scope of the invention. The scope of the present invention is defined by the appended claims.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The invention is operational with numerous general purpose or special purpose computing system environments or configurations, such as: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. The utility model provides an initiative short-circuit control circuit, initiative short-circuit control circuit supplies power through whole car low voltage power supply and whole car generating line, specifically includes:
the power module controls the state of a switch device of the power module to realize the control of the motor;
the microcontroller is used for outputting a motor control signal;
the driving module is electrically connected between the power module and the microcontroller, and is used for carrying out photoelectric isolation and signal amplification on a control signal output by the microcontroller and then sending the control signal to the power module;
it is characterized by also comprising:
the microcontroller monitoring module is used for monitoring the running state of the microcontroller in real time and sending an abnormal signal to the active short-circuit processing module when the microcontroller is abnormal;
the overvoltage monitoring module is used for monitoring the bus voltage in real time and outputting a voltage division signal of the bus voltage to the active short-circuit processing module;
the active short-circuit processing module is respectively connected with the driving module, the microcontroller monitoring module and the overvoltage monitoring module, receives monitoring signals from the microcontroller monitoring module and partial pressure signals of bus voltage from the overvoltage monitoring module, and outputs digital signals for controlling an active short-circuit state to the driving module after signal processing.
2. The active short control circuit of claim 1, further comprising:
the isolation driving power supply is used for converting the voltage of a low-voltage system of the whole vehicle into high-voltage driving voltage and supplying power for the driving high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module;
and the backup power supply module is used for taking power through the bus voltage, and when the low-voltage system is powered down or the isolation driving power supply module fails, the backup power supply module is used for supplying power to the driving high-voltage side circuit, the active short-circuit processing module and the overvoltage monitoring module respectively.
3. The active short-circuit control circuit of claim 1, wherein the active short-circuit processing module isolates and converts a low-voltage signal sent by the microcontroller monitoring module into a high-voltage side signal, and detects whether the bus voltage exceeds a safety threshold according to a voltage division signal of the bus voltage;
the active short circuit processing module specifically comprises: isolation module, signal processing module, buffer, comparator and OR-gate, wherein:
the isolation module is used for receiving the monitoring signal sent by the microcontroller monitoring module, isolating the monitoring signal from a low-voltage signal, converting the monitoring signal into a high-voltage side signal and outputting the high-voltage side signal to the signal processing module;
the signal processing module receives the high-voltage side signal for identification and monitoring from the signal processing module and sends a digital signal for controlling an active short-circuit state to one end of the OR gate;
the buffer receives a voltage division signal of bus voltage from the overvoltage monitoring module, performs impedance matching and transmits the voltage division signal to the comparator;
the comparator sends an active short circuit control signal to the other end of the OR gate when the voltage division signal of the bus voltage exceeds a threshold value;
and when one of the microcontroller and the bus voltage is abnormal, the OR gate sends an active short-circuit signal to the driving high-voltage side circuit, and then the high-voltage side circuit drives the power module.
4. The active short-circuit control circuit according to claim 3, wherein the isolation module is a photo-coupler, the positive electrode of the light emitting diode in the photo-coupler is the microcontroller operating state signal input terminal, the negative electrode of the light emitting diode is grounded, the collector of the photo-transistor corresponding to the light emitting diode is connected to the positive electrode of the first diode, the emitter of the photo-transistor is grounded, one end of the first capacitor and the first resistor is connected between the non-inverting terminals of the first diode and the second comparator, the other end of the first capacitor and the first resistor is grounded, the anti-inverting terminal of the second comparator is connected to the high level, the anti-inverting terminal of the third comparator is connected between the non-inverting terminals of the first diode and the second comparator, the non-inverting terminal of the third comparator is connected to the low level, the output terminals of the second and the third comparators are connected to the two input terminals of the fourth or gate, the output terminal of the fourth or gate is connected to one input terminal of the fifth or gate, and the output terminal of the fifth or gate is the active short-circuit signal terminal.
5. The active short-circuit control circuit according to claim 3, wherein the buffer comprises a sixth operational amplifier, a second resistor and a second capacitor, wherein a non-inverting terminal of the sixth operational amplifier is connected to one terminal of the second resistor, the other terminal of the second resistor is connected to the input terminal of the overvoltage monitoring signal, an inverting terminal of the sixth operational amplifier is connected to the output terminal, the output terminal of the sixth operational amplifier is further connected to one terminal of a third resistor, the other terminal of the third resistor is connected to the non-inverting terminal of the seventh operational amplifier, the fourth resistor is connected between the non-inverting terminal and the output terminal of the seventh operational amplifier, the inverting terminal of the seventh operational amplifier is used for setting the equivalent threshold voltage, the output terminal of the seventh operational amplifier is connected to the other input terminal of the fifth or gate, and the output terminal of the fifth or gate is the active short-circuit signal terminal.
6. An active short circuit control device, characterized in that the active short circuit control circuit of any one of claims 1 to 5 is provided in the active short circuit control device.
7. An active short circuit control method is characterized by specifically comprising the following steps:
detecting whether the driving module or the power module has a fault, and sending an active short-circuit signal or maintaining the original state to work normally according to the existence of the fault;
judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal work of the original state;
and detecting the working state of the microcontroller, and sending an active short-circuit signal or maintaining the original state to work normally.
8. The active short-circuit control method according to claim 7, specifically comprising:
whether the driving module or the power module has faults or not is detected, if the faults exist, the driving module sends fault signals to the microcontroller, the microcontroller identifies and reports the whole vehicle and then sends active short-circuit signals to the driving module, and the motor enters an active short-circuit safety state, or: if no fault exists, the original state is maintained to normally work;
judging whether the bus voltage is overvoltage or not, and if the bus voltage is not overvoltage, maintaining the original state to normally work; if the bus voltage is overvoltage, the active short-circuit processing module sends an active short-circuit signal to the driving high-voltage circuit, and further judges whether the bus voltage is discharged to be lower than the turn-off threshold voltage: if the bus voltage is discharged to be lower than the turn-off threshold voltage, the active short-circuit processing module stops sending the active short-circuit signal; if the bus voltage discharge is not lower than the turn-off threshold voltage, the active short-circuit processing module continues to send an active short-circuit signal;
judging whether the microcontroller works normally, if the microcontroller works normally, maintaining the original state to work normally, or: and when the microcontroller works abnormally, the active short-circuit processing module sends an active short-circuit signal to the driving high-voltage circuit.
9. An active short circuit control system is characterized by specifically comprising:
the driving/power module fault detection unit is used for detecting whether the driving module or the power module has a fault or not, and sending an active short-circuit signal or maintaining the normal operation of the original state;
the bus voltage overvoltage detection unit is used for judging whether the bus voltage is overvoltage or not, further judging whether the bus voltage is discharged to be lower than a judgment threshold voltage or not, and sending an active short circuit signal or maintaining the normal operation of the original state;
and the microcontroller state detection unit is used for sending an active short-circuit signal or maintaining the original state to work normally according to the working state of the microcontroller.
10. An electronic device, comprising: the system comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; the memory has stored therein a computer program which, when executed by the processor, causes the processor to carry out the steps of the method of claim 7 or 8.
11. A computer-readable storage medium, in which a computer program is stored which is executable by an electronic device, and which, when run on the electronic device, causes the electronic device to carry out the steps of the method of claim 7 or 8.
12. A vehicle provided with an active short circuit control system for controlling a motor to enter an active short circuit state when a control and drive unit of an electric drive system inverter of the vehicle is out of order, further comprising:
the electronic equipment is used for realizing the active short circuit control method;
a processor running a program, the program when running executing the steps of the active short circuit control method of claim 7 or 8 from data output by the electronic device;
storage medium for storing a program which, when running, performs the steps of the active short-circuit control method of claim 7 or 8 on data output from an electronic device.
CN202210843074.6A 2022-07-18 2022-07-18 Active short circuit control circuit, device thereof, control method and system thereof, and vehicle Pending CN115275931A (en)

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JP7156321B2 (en) * 2020-02-13 2022-10-19 株式会社デンソー Power converter control circuit
CN111959278B (en) * 2020-07-21 2024-04-09 一巨自动化装备（上海）有限公司 Motor controller lower bridge arm active turn-off control system and method
CN114172120A (en) * 2021-12-01 2022-03-11 中国第一汽车股份有限公司 Active short circuit control circuit and method
CN114285001B (en) * 2021-12-31 2024-01-26 蜂巢传动科技河北有限公司 Vehicle motor control system and method
CN115275931A (en) * 2022-07-18 2022-11-01 中国第一汽车股份有限公司 Active short circuit control circuit, device thereof, control method and system thereof, and vehicle

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WO2024016759A1 (en) * 2022-07-18 2024-01-25 中国第一汽车股份有限公司 Active short-circuit control circuit, device, method and system, and vehicle
CN117526544A (en) * 2024-01-03 2024-02-06 深圳市英威腾电源有限公司 Control method and system of UPS module, electronic equipment and storage medium
CN117526544B (en) * 2024-01-03 2024-05-17 深圳市英威腾电源有限公司 Control method and system of UPS module, electronic equipment and storage medium

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