CN117639214A - Inversion system for motor driving - Google Patents

Inversion system for motor driving Download PDF

Info

Publication number
CN117639214A
CN117639214A CN202311717385.9A CN202311717385A CN117639214A CN 117639214 A CN117639214 A CN 117639214A CN 202311717385 A CN202311717385 A CN 202311717385A CN 117639214 A CN117639214 A CN 117639214A
Authority
CN
China
Prior art keywords
power supply
voltage
module
circuit
driving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311717385.9A
Other languages
Chinese (zh)
Inventor
高建秋
周宣
徐艺
任重远
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Jinmai Electric Control Technology Co ltd
Original Assignee
Jiangsu Jinmai Electric Control Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Jinmai Electric Control Technology Co ltd filed Critical Jiangsu Jinmai Electric Control Technology Co ltd
Priority to CN202311717385.9A priority Critical patent/CN117639214A/en
Publication of CN117639214A publication Critical patent/CN117639214A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H02H7/0833—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 for electric motors with control arrangements
    • 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
    • H02H7/09—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 over-voltage; against reduction of voltage; against phase interruption
    • 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
    • H02H7/10—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 converters; for rectifiers
    • H02H7/12—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 converters; for rectifiers for static converters or rectifiers
    • H02H7/122—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

Landscapes

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

Abstract

The invention discloses an inversion system for driving a motor, which comprises a high-voltage battery, an emergency power supply module, a current-limiting turn-off module, a driving power supply module, a control switch module, a system basic power supply module, a low-voltage battery, a lower bridge driving circuit, an upper bridge driving circuit, a system control chip circuit and a rotary transformer. And through the current limiting and switching-off function, the power supply can be rapidly switched when the lower bridge drive is short-circuited or over-current, the normal power supply of other parts is ensured, and the reliability and redundancy of the system are improved.

Description

Inversion system for motor driving
Technical Field
The invention relates to the technical field of power electronics, in particular to an inverter system for driving a motor.
Background
In the motor driving inverter system, in order to ensure that a motor controller can also enter a safe state after the power failure of a high-voltage battery occurs, a common solution is that when a backup power supply at the side of the high-voltage power battery is under-voltage, the backup power supply supplies power to a lower bridge driving circuit, and the system is ensured to enter a lower bridge ASC state; the functions can only realize the lower bridge ASC; when the lower bridge driving chip is short-circuited or overcurrent, the power supply of the low-voltage side power supply and the high-voltage side power supply can be directly influenced, and the system cannot meet the requirement of higher functional safety level. Therefore, it is necessary to design an inverter system for driving a motor with high reliability and high redundancy.
Disclosure of Invention
The present invention is directed to an inverter system for driving a motor, which solves the above-mentioned problems.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides an inversion system for motor drive, includes high-voltage battery, urgent power module, current-limiting shutoff module, drive power module, control switch module, system basic power module, low-voltage battery, lower bridge drive circuit, upper bridge drive circuit, system control chip circuit and resolver, wherein:
the lower bridge driving circuit is a motor inverter lower bridge driving circuit;
the upper bridge driving circuit is a motor inverter upper bridge driving circuit;
the system control chip circuit is a system operation logic control unit circuit;
the rotary transformer is a sensor for measuring the angle, the rotating speed and the position of the motor;
the upper bridge driving circuit, the lower bridge driving circuit, the system control chip circuit and the rotary transformer are powered parts.
According to the technical scheme, the driving power supply module is used for supplying power for 3 upper bridge driving circuits of the motor inverter, and the current-limiting shutdown module is used for making backup power for 3 lower bridge driving circuits.
According to the technical scheme, the emergency power supply module is used for supplying power for 3 lower bridge drives of the motor, and supplying power for the driving power supply module and the system base power supply module when the voltage of the battery is lower than a set threshold value through the control switch module.
According to the technical scheme, the system basic power supply module is used for supplying power to the low-voltage control system and the rotary transformer circuit.
According to the above technical scheme, the current-limiting shutdown module is configured to operate when the abnormal or failed output voltage of the emergency power module is lower than a set threshold, connect the VDDLS2 power supply of the driving power supply to VDDLS1, supply power to the 3 lower bridge driving circuits, monitor the output current of VDDLS2, and close the current-limiting shutdown circuit when the output current is higher than the set threshold current.
According to the above technical solution, the control switch module is configured to selectively conduct the power supply of the low-voltage battery and the backup power supply VDDLV output by the emergency power supply module, to provide power for the driving power supply module and the system base power supply module, and when the power supply KL30 of the low-voltage battery is lower than a set threshold value, VDDLV will provide power for the driving power supply module and the system base power supply module through the control switch module, and power supply of KL30 is disconnected from the driving power supply module and the system base power supply module to provide power; when the power KL30 of the low-voltage battery is higher than or equal to the set threshold value, the KL30 supplies power to the driving power module and the system base power module through the control switch module, and the VDDLV power supply is disconnected from the driving power module and the system base power module to supply power.
According to the technical scheme, the operation process of the motor driving inverter system comprises the following steps of:
step S1: under the normal power supply working condition, when the low-voltage battery is electrified, the system control chip circuit and the system basic power supply module are electrified, the driving power supply module is electrified and is responsible for supplying power to the upper tube driving chip, and simultaneously, the VDDLS2 supplies power to the lower bridge driving chip through the current-limiting shutoff module, when the high-voltage power supply is electrified, the power supply of the lower bridge driving chip is taken over by the high-voltage power supply VDDLS1, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting shutoff module circuit; at this time, if the lower bridge driving is short-circuited or has an overcurrent fault, the low-voltage power supply VDDLS2 is not affected;
step S2: when the low-voltage battery is subjected to under-voltage recovery, the low-voltage network KL30 is powered down, the high-voltage power supply VDDCV can supply power to the low-voltage network through the control switch module circuit, so that the power supply of a system control chip circuit, a system basic power supply module and a driving power supply module of the low-voltage network is not influenced, the system has enough time to enter a safe state, and when the low-voltage network KL30 is recovered to normal voltage, the low-voltage battery can take over the low-voltage network again through the control switch module circuit; thereby recovering to the normal power supply working condition;
step S3: when the high-voltage power supply VDDLS1 is under-voltage and is recovered, the high-voltage power supply VDDLS1 is under-voltage due to failure, the power supply of the lower bridge driving chip is automatically switched to the power supply of the VDDLS2 of the driving power supply module through the current-limiting shutoff module circuit, and after the system detects that the VDDLS1 is under-voltage, the system has enough time to enter a safe state;
if the lower bridge drive has short circuit or overcurrent faults during the power supply of the VDDLS2, the VDDLS2 can realize power-limiting protection through a current-limiting shutdown module circuit, so that the rest power supply of the drive power supply module is prevented from being influenced; after the system detects the fault, enough time is left for entering a safe state; after the VDDLS1 is recovered to normal power supply, the power supply of the lower bridge driving chip is switched back to the VDDLS1 power supply through the current-limiting and switching-off module circuit, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting and switching-off module circuit;
step S4: under the working condition of the trailer, the low-voltage network KL30 is unpowered, and the high-voltage power supply is started due to the working condition of the trailer, so that the VDDLV supplies power to the low-voltage network through the control switch module circuit, and after a system control chip circuit and a system basic power supply module of the minimum system obtain power, whether the system enters a safety state or not is judged according to a detection result, and switching of the safety state is realized.
According to the technical scheme, the operation method of the current-limiting shutdown module comprises the following steps:
the circuit detects load current through a sampling resistor R19, so that a certain voltage value is obtained at the same-phase end PIN5 of the comparator IC1B and is compared with the voltage value of the PIN6, wherein the voltage value of the PIN6 is obtained by dividing the voltage of V_P24_LS_1 through R5 and R14;
at the moment of overcurrent, the PIN5 voltage is higher than the PIN6 voltage, the comparator outputs high resistance, the triode Q2 is conducted, the PIN2 voltage at the inverting end of the IC1A is pulled down to zero and is lower than the PIN3 voltage at the non-inverting end, the IC1A outputs high resistance, the triode Q1 is disconnected, and the V_P24_LS_2 is powered off, so that the current-limiting shutdown function is realized;
if the overcurrent state is released, the in-phase terminal PIN5 voltage of the IC1B is lower than the inverting terminal PIN6, the comparator IC1B outputs a low level, so that Q2 is turned off, the inverting terminal PIN2 voltage of the IC1A (U1 is obtained by configuring R1, R2, R7, R8 and R13) is higher than the in-phase terminal PIN3, the IC1A outputs a low level, the triode Q1 is turned on, and v_p24_ls_2 is powered on, so that voltage recovery after current limiting is turned off is realized.
In the above process, the threshold value of the current-limiting turn-off is maintained to be a certain constant value.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, through the organic combination of components such as the high-voltage battery, the emergency power supply module, the current limiting and switching-off module, the driving power supply module and the like, the backup of the high-voltage side power supply and the low-voltage side power supply is realized, and the system can enter a safe state under the condition of power failure or fault of the low-voltage battery. And through the current limiting and switching-off function, the power supply can be rapidly switched when the lower bridge drive is short-circuited or over-current, the normal power supply of other parts is ensured, and the reliability and redundancy of the system are improved. Finally, through the optimization of the system isolation circuit, the overvoltage shutoff function is realized, the high-voltage side power supply and the low-voltage side power supply are effectively isolated, and the safety of the system is further improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a system module architecture of the present invention;
FIG. 2 is a schematic diagram of a comparator-based current limit shutdown module circuit scheme of the present invention;
fig. 3 is a schematic circuit diagram of a current limiting shutdown module based on an operational amplifier according to the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides the following technical solutions: the utility model provides an inversion system for motor drive, includes high-voltage battery, urgent power module, current-limiting shutoff module, drive power module, control switch module, system basic power module, low-voltage battery, lower bridge drive circuit, upper bridge drive circuit, system control chip circuit and resolver, wherein:
the lower bridge driving circuit is a motor inverter lower bridge driving circuit;
the upper bridge driving circuit is a motor inverter upper bridge driving circuit;
the system control chip circuit is a system operation logic control unit circuit;
the rotary transformer is a sensor for measuring the angle, the rotating speed and the position of the motor;
the upper bridge driving circuit, the lower bridge driving circuit, the system control chip circuit and the rotary transformer are powered parts.
The driving power supply module is used for supplying power to 3 upper bridge driving circuits of the motor inverter, and the current-limiting shutdown module is used for making backup power for 3 lower bridge driving circuits.
The emergency power supply module is used for supplying power for 3 lower bridge drives of the motor, and provides power for the drive power supply module and the system base power supply module when the voltage of the battery is lower than a set threshold value through the control switch module.
The system base power supply module is used for supplying power to the low-voltage control system and the rotary transformer circuit.
The current-limiting shutdown module is used for connecting a VDLS 2 power supply of the driving power supply to the VDLS 1 to supply power for the 3 lower bridge driving circuits when the abnormal or faulty output voltage of the emergency power supply module is lower than a set threshold value, and for monitoring the output current of the VDLS 2 and closing the current-limiting shutdown circuit when the output voltage is higher than the set threshold value.
The control switch module is used for selectively conducting the power supply of the low-voltage battery and the backup power supply VDDLV output by the emergency power supply module to provide power for the driving power supply module and the system basic power supply module, and when the power supply KL30 of the low-voltage battery is lower than a set threshold value, the VDDLV provides power for the driving power supply module and the system basic power supply module through the control switch module, and the power supply of the KL30 is disconnected from the driving power supply module and the system basic power supply module to provide power; when the power KL30 of the low-voltage battery is higher than or equal to the set threshold value, the KL30 supplies power to the driving power module and the system base power module through the control switch module, and the VDDLV power supply is disconnected from the driving power module and the system base power module to supply power.
The operation process of the motor driving inverter system comprises the following steps:
step S1: under the normal power supply working condition, when the low-voltage battery is electrified, the system control chip circuit and the system basic power supply module are electrified, the driving power supply module is electrified and is responsible for supplying power to the upper tube driving chip, and simultaneously, the VDDLS2 supplies power to the lower bridge driving chip through the current-limiting shutoff module, when the high-voltage power supply is electrified, the power supply of the lower bridge driving chip is taken over by the high-voltage power supply VDDLS1, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting shutoff module circuit; at this time, if the lower bridge driving is short-circuited or has an overcurrent fault, the low-voltage power supply VDDLS2 is not affected;
step S2: when the low-voltage battery is subjected to under-voltage recovery, the low-voltage network KL30 is powered down, the high-voltage power supply VDDCV can supply power to the low-voltage network through the control switch module circuit, so that the power supply of a system control chip circuit, a system basic power supply module and a driving power supply module of the low-voltage network is not influenced, the system has enough time to enter a safe state, and when the low-voltage network KL30 is recovered to normal voltage, the low-voltage battery can take over the low-voltage network again through the control switch module circuit; thereby recovering to the normal power supply working condition;
step S3: when the high-voltage power supply VDDLS1 is under-voltage and is recovered, the high-voltage power supply VDDLS1 is under-voltage due to failure, the power supply of the lower bridge driving chip is automatically switched to the power supply of the VDDLS2 of the driving power supply module through the current-limiting shutoff module circuit, and after the system detects that the VDDLS1 is under-voltage, the system has enough time to enter a safe state;
if the lower bridge drive has short circuit or overcurrent faults during the power supply of the VDDLS2, the VDDLS2 can realize power-limiting protection through a current-limiting shutdown module circuit, so that the rest power supply of the drive power supply module is prevented from being influenced; after the system detects the fault, enough time is left for entering a safe state; after the VDDLS1 is recovered to normal power supply, the power supply of the lower bridge driving chip is switched back to the VDDLS1 power supply through the current-limiting and switching-off module circuit, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting and switching-off module circuit;
step S4: under the working condition of the trailer, the low-voltage network KL30 is unpowered, and the high-voltage power supply is started due to the working condition of the trailer, so that the VDDLV supplies power to the low-voltage network through the control switch module circuit, and after a system control chip circuit and a system basic power supply module of the minimum system obtain power, whether the system enters a safety state or not is judged according to a detection result, and switching of the safety state is realized.
Referring to fig. 2, Q1 is a PNP transistor, Q2 is an NPN transistor, IC1A, IC1B is a comparator, U1 is a voltage reference, vjp24_ls_1 is a power supply from a low voltage supply network, and vjp24_ls_2 is a power supply from a high voltage supply network. Meanwhile, V_P24_LS_2 is connected to a load end, namely a lower bridge driving chip, and R19 is a load current sampling resistor.
The operation method of the current-limiting shutdown module comprises the following steps:
the circuit detects load current through a sampling resistor R19, so that a certain voltage value is obtained at the same-phase end PIN5 of the comparator IC1B and is compared with the voltage value of the PIN6, wherein the voltage value of the PIN6 is obtained by dividing the voltage of V_P24_LS_1 through R5 and R14;
at the moment of overcurrent, the PIN5 voltage is higher than the PIN6 voltage, the comparator outputs high resistance, the triode Q2 is conducted, the PIN2 voltage at the inverting end of the IC1A is pulled down to zero and is lower than the PIN3 voltage at the non-inverting end, the IC1A outputs high resistance, the triode Q1 is disconnected, and the V_P24_LS_2 is powered off, so that the current-limiting shutdown function is realized;
if the overcurrent state is released, the in-phase terminal PIN5 voltage of the IC1B is lower than the inverting terminal PIN6, the comparator IC1B outputs a low level, so that Q2 is turned off, the inverting terminal PIN2 voltage of the IC1A (U1 is obtained by configuring R1, R2, R7, R8 and R13) is higher than the in-phase terminal PIN3, the IC1A outputs a low level, the triode Q1 is turned on, and v_p24_ls_2 is powered on, so that voltage recovery after current limiting is turned off is realized.
In the above process, the threshold value of the current-limiting turn-off is maintained to be a certain constant value.
Referring to fig. 3, Q1 is a PNP transistor, Q2 is an NPN transistor, IC1A, IC1B are operational amplifiers, U1 is a voltage reference, v_p24_ls_1 is a power supply from a low voltage supply network, and v_p24_ls_2 is a power supply from a high voltage supply network. Meanwhile, V_P24_LS_2 is connected to a load end, namely a lower bridge driving chip, and R19 is a load current sampling resistor.
The principle of the optimized system isolation circuit is as follows:
overvoltage shutdown function:
1. the voltage source v_p24_ls_1 is powered off before v_p24_ls_2 is powered off, the NPN triode Q2 is not turned on, the inverting terminal PIN2 of the operational amplifier IC1A is greater than the voltage of the non-inverting terminal PIN3, the IC1A outputs a low level, the PNP triode Q1 is turned on, v_p24_ls_2 is powered from v_p24_ls_1, and v_p24_ls_1=v_p24_ls_2.
2. After v_p24_ls_2 is powered up, by configuring the resistors R3, R11 so that the voltage at the inverting terminal PIN2 is still higher than the voltage at the non-inverting terminal PIN3, IC1A outputs a low level, Q1 continues to be turned on, v_p24_ls_2 continues to be powered up from v_p24_ls_1, at which time v_p24_ls_1=v_p24_ls_2.
3. After the high-voltage power supply is electrified, the output V_P24_LS_2 of the high-voltage side power supply is set to be higher than the output V_P24_LS_1 of the low-voltage side power supply, the voltage of the in-phase end PIN3 of the IC1A is larger than that of the reverse end PIN2, the output of the IC1A is high-resistance, the triode Q1 is disconnected, and the electrical isolation between the low-voltage side power supply V_P24_LS_1 and the high-voltage side power supply V_P24_LS_2 is realized.
Current limiting function:
this function occurs when the high-side power supply is not established or the high-side power supply fails under voltage
1. At the moment of overcurrent, the circuit detects load current through the sampling resistor R19, so that the in-phase end PIN5 of the operational amplifier IC1B obtains a certain voltage value, the voltage value is amplified by the IC1B negative feedback amplifying circuits (R10, R13 and R4), and then the voltage is divided by the R15 and the R14, so that Q2 is conducted. The voltage of the inverting terminal PIN2 of the IC1A is pulled down to zero (R8 and R17 are configured), the voltage is lower than that of the inverting terminal PIN3, the output of the IC1A is high-resistance, the triode Q1 is disconnected, and the V_P24_LS_2 is powered down, so that the current limiting function is realized.
2. If the overcurrent state is released, the voltage of the in-phase end PIN5 of the IC1B is reduced to cause the disconnection of Q2, the voltage of the inverting end PIN2 of the IC1A is higher than that of the in-phase end PIN3, the IC1A outputs a low level, the triode Q1 is conducted, and the V_P24_LS_2 is electrified, so that the voltage recovery after the current limiting is closed is realized;
the invention realizes that the high-voltage side power supply and the low-voltage side power supply are mutually backed up through the organic combination of the components such as the high-voltage battery, the emergency power supply module, the current-limiting shutoff module, the driving power supply module and the like, and ensures that the system can enter a safe state under the condition of power failure or failure of the low-voltage battery. And through the current limiting and switching-off function, the power supply can be rapidly switched when the lower bridge drive is short-circuited or over-current, the normal power supply of other parts is ensured, and the reliability and redundancy of the system are improved. Finally, through the optimization of the system isolation circuit, the overvoltage shutoff function is realized, the high-voltage side power supply and the low-voltage side power supply are effectively isolated, and the safety of the system is further improved.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. An inverter system for driving a motor, characterized in that: the motor drive inverter system comprises a high-voltage battery, an emergency power supply module, a current-limiting shutoff module, a drive power supply module, a control switch module, a system basic power supply module, a low-voltage battery, a lower bridge drive circuit, an upper bridge drive circuit, a system control chip circuit and a rotary transformer, wherein:
the lower bridge driving circuit is a motor inverter lower bridge driving circuit;
the upper bridge driving circuit is a motor inverter upper bridge driving circuit;
the system control chip circuit is a system operation logic control unit circuit;
the rotary transformer is a sensor for measuring the angle, the rotating speed and the position of the motor;
the upper bridge driving circuit, the lower bridge driving circuit, the system control chip circuit and the rotary transformer are powered parts.
2. The motor driving inverter system according to claim 1, wherein: the driving power supply module is used for supplying power to 3 upper bridge driving circuits of the motor inverter, and the current-limiting shutdown module is used for making backup power for 3 lower bridge driving circuits.
3. The inverter system for motor driving according to claim 2, wherein: the emergency power supply module is used for supplying power for 3 lower bridge drives of the motor, and provides power for the drive power supply module and the system basic power supply module when the voltage of the battery is lower than a set threshold value through the control switch module.
4. A motor driving inverter system according to claim 3, wherein: the system basic power supply module is used for supplying power to the low-voltage control system and the rotary transformer circuit.
5. The motor driving inverter system according to claim 4, wherein: the current-limiting shutdown module is used for connecting a VDLS 2 power supply of the driving power supply to the VDLS 1 to supply power to the 3 lower bridge driving circuits when the abnormal or fault output voltage of the emergency power supply module is lower than a set threshold value, monitoring the output current of the VDLS 2, and closing the current-limiting shutdown circuit when the output voltage is higher than the set threshold value.
6. The motor driving inverter system according to claim 5, wherein: the control switch module is used for selectively conducting the power supply of the low-voltage battery and the backup power supply VDDLV output by the emergency power supply module to provide power for the driving power supply module and the system basic power supply module, and when the power supply KL30 of the low-voltage battery is lower than a set threshold value, the VDDLV provides power for the driving power supply module and the system basic power supply module through the control switch module, and the power supply of the KL30 is disconnected from the driving power supply module and the system basic power supply module to provide power; when the power KL30 of the low-voltage battery is higher than or equal to the set threshold value, the KL30 supplies power to the driving power module and the system base power module through the control switch module, and the VDDLV power supply is disconnected from the driving power module and the system base power module to supply power.
7. The motor driving inverter system according to claim 6, wherein: the operation process of the motor driving inverter system comprises the following steps:
step S1: under the normal power supply working condition, when the low-voltage battery is electrified, the system control chip circuit and the system basic power supply module are electrified, the driving power supply module is electrified and is responsible for supplying power to the upper tube driving chip, and simultaneously, the VDDLS2 supplies power to the lower bridge driving chip through the current-limiting shutoff module, when the high-voltage power supply is electrified, the power supply of the lower bridge driving chip is taken over by the high-voltage power supply VDDLS1, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting shutoff module circuit; at this time, if the lower bridge driving is short-circuited or has an overcurrent fault, the low-voltage power supply VDDLS2 is not affected;
step S2: when the low-voltage battery is subjected to under-voltage recovery, the low-voltage network KL30 is powered down, the high-voltage power supply VDDCV can supply power to the low-voltage network through the control switch module circuit, so that the power supply of a system control chip circuit, a system basic power supply module and a driving power supply module of the low-voltage network is not influenced, the system has enough time to enter a safe state, and when the low-voltage network KL30 is recovered to normal voltage, the low-voltage battery can take over the low-voltage network again through the control switch module circuit; thereby recovering to the normal power supply working condition;
step S3: when the high-voltage power supply VDDLS1 is under-voltage and is recovered, the high-voltage power supply VDDLS1 is under-voltage due to failure, the power supply of the lower bridge driving chip is automatically switched to the power supply of the VDDLS2 of the driving power supply module through the current-limiting shutoff module circuit, and after the system detects that the VDDLS1 is under-voltage, the system has enough time to enter a safe state;
if the lower bridge drive has short circuit or overcurrent faults during the power supply of the VDDLS2, the VDDLS2 can realize power-limiting protection through a current-limiting shutdown module circuit, so that the rest power supply of the drive power supply module is prevented from being influenced; after the system detects the fault, enough time is left for entering a safe state; after the VDDLS1 is recovered to normal power supply, the power supply of the lower bridge driving chip is switched back to the VDDLS1 power supply through the current-limiting and switching-off module circuit, and the VDDLS2 and the VDDLS1 realize electrical separation through the current-limiting and switching-off module circuit;
step S4: under the working condition of the trailer, the low-voltage network KL30 is unpowered, and the high-voltage power supply is started due to the working condition of the trailer, so that the VDDLV supplies power to the low-voltage network through the control switch module circuit, and after a system control chip circuit and a system basic power supply module of the minimum system obtain power, whether the system enters a safety state or not is judged according to a detection result, and switching of the safety state is realized.
8. The motor driving inverter system according to claim 7, wherein: the operation method of the current-limiting shutdown module comprises the following steps:
the circuit detects load current through a sampling resistor R19, so that a certain voltage value is obtained at the same-phase end PIN5 of the comparator IC1B and is compared with the voltage value of the PIN6, wherein the voltage value of the PIN6 is obtained by dividing the voltage of V_P24_LS_1 through R5 and R14;
at the moment of overcurrent, the PIN5 voltage is higher than the PIN6 voltage, the comparator outputs high resistance, the triode Q2 is conducted, the PIN2 voltage at the inverting end of the IC1A is pulled down to zero and is lower than the PIN3 voltage at the non-inverting end, the IC1A outputs high resistance, the triode Q1 is disconnected, and the V_P24_LS_2 is powered off, so that the current-limiting shutdown function is realized;
if the overcurrent state is released, the voltage of the in-phase terminal PIN5 of the IC1B is lower than the voltage of the anti-phase terminal PIN6, the comparator IC1B outputs a low level to disconnect Q2, the voltage of the anti-phase terminal PIN2 of the IC1A (U1 is obtained by configuring R1, R2, R7, R8 and R13) is higher than the voltage of the in-phase terminal PIN3, the IC1A outputs a low level, the triode Q1 is conducted, and the V_P24_LS_2 is electrified, so that the voltage recovery after the current limiting is closed is realized;
in the above process, the threshold value of the current-limiting turn-off is maintained to be a certain constant value.
CN202311717385.9A 2023-12-14 2023-12-14 Inversion system for motor driving Pending CN117639214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311717385.9A CN117639214A (en) 2023-12-14 2023-12-14 Inversion system for motor driving

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311717385.9A CN117639214A (en) 2023-12-14 2023-12-14 Inversion system for motor driving

Publications (1)

Publication Number Publication Date
CN117639214A true CN117639214A (en) 2024-03-01

Family

ID=90025236

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311717385.9A Pending CN117639214A (en) 2023-12-14 2023-12-14 Inversion system for motor driving

Country Status (1)

Country Link
CN (1) CN117639214A (en)

Similar Documents

Publication Publication Date Title
TWI765084B (en) Electric vehicle high voltage power off method
CN101854051B (en) Hot plug device of high-voltage DC UPS
CN221127518U (en) Full-automatic self-recovery quick response short circuit protection circuit
CN218866065U (en) Fault abnormal state holding circuit, device and robot
JP2001265452A (en) Line abnormality monitoring device
CN117639214A (en) Inversion system for motor driving
CN115693593A (en) Overvoltage protection device of vehicle power supply, vehicle and overvoltage protection method of vehicle power supply
CN212518377U (en) Protection circuit with anti-dragging starting direct current generator controller
CN210468775U (en) Power output protection circuit and circuit protection device
CN111600291A (en) Safe and controllable power-on and power-off control circuit and control method
CN209963830U (en) DC uninterrupted power system
KR20080039134A (en) Over current protection circuit in dc/ac inverter
CN113640661A (en) Line fault monitoring system based on safety relay
CN117767221A (en) Load protection circuit and method
CN108574427B (en) Frequency converter brake unit and frequency converter
CN118158855B (en) LED power supply with self-recovery quick-response short-circuit protection function
CN116826659B (en) Adjustable current-limiting protection circuit
CN219085020U (en) Overcurrent detection circuit and isolating switch controller
CN221552820U (en) Protection circuit for exciting circuit and electronic equipment
CN114552528B (en) Train LCU protection circuit and fault detection method thereof
CN219096497U (en) Switch control circuit of battery management system, battery management system and vehicle
CN113676116B (en) Active discharge circuit with fault diagnosis
CN221767613U (en) Power supply device
CN220985310U (en) Protection circuit, power supply circuit and cleaning device
CN221408527U (en) Power supply circuit of USB interface

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination