JP2005080417A - Motor drive control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to, if any anomaly, such as overtemperature, overcurrent, and overvoltage, occurs in a semiconductor switching element constituting the output stage of a motor drive unit, interrupt power supply to the motor drive unit and thereby prevent abnormal overheat and protect the output stage. <P>SOLUTION: The motor drive unit 20 drives motors 2 and 3 for driving a fan for cooling a radiator and a fan for cooling a capacitor by PWM control. If the anomaly detection portion 29 in the motor drive unit detects any of overtemperature, overcurrent, and overvoltage in semiconductor switching elements (e.g. FETs 25 and 26) constituting the output stage, the anomaly detection portion supplies anomaly information to a main control unit 10 through a data communication portion 22. When the power supply interruption control portion 14 in the main control unit 10 receives the anomaly information, it drives and opens the relay contact 312 in a power supply interruption unit 30 to interrupt power supply from a battery 4 to the motor drive unit 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drive control device for a motor that drives a cooling fan, a blower fan, and the like.

  In a vehicle with an air conditioner, a cooling medium flowing in a condenser and a radiator is cooled by operating two cooling fans. The motor for driving the cooling fan is driven by pulse width modulation control, so that the rotation speed of the motor is continuously varied (see Patent Document 1).

  By monitoring the current flowing in the semiconductor switching element that drives the motor and limiting the pulse width in the pulse width modulation control to a constant value, the motor current is limited, or the driving of the semiconductor switching element is stopped. Protection against electric current is achieved (see Patent Document 2).

  In addition, the motor drive device (motor drive unit) and the system controller (main control unit) are connected by communication means, a motor start / stop command and a rotation speed command are transmitted from the system controller, an overload from the motor drive device, An apparatus in which overheat and rotation speed information is transmitted is known (see Patent Document 3).

Also, there is known a thermal fuse means that blows at a predetermined temperature, and when the semiconductor switching element abnormally generates heat, the temperature fuse means blows to cut off the power supply to the semiconductor switching element or the like. (See Patent Document 4).
JP-A-10-2222 Japanese Patent Laid-Open No. 10-8959 JP-A-7-67389 Japanese Patent Laid-Open No. 10-201210

  When an abnormality occurs in the operation of the semiconductor switching element that drives the motor (for example, when the characteristics of the semiconductor switching element deteriorate and the on-state impedance (on-resistance) increases, or the off-state impedance decreases) However, there is a possibility that the power consumption of the semiconductor switching element is increased and the semiconductor switching element is abnormally overheated. Also, when an overvoltage is supplied to the motor or when the motor is locked, the current flowing through the semiconductor switching element becomes excessive, and the semiconductor switching element may be abnormally overheated.

  It is possible to prevent the thermal overheating state from continuing by providing the thermal fuse means and cutting off the power supply by melting the thermal fuse means at the time of abnormal overheating. When the thermal fuse means is blown, the motor cannot be driven until it is reassembled.

  In addition, in the case of providing communication means and transmitting information such as overload and overheat from the motor drive device, cope with overload, overheat, etc. when the communication means does not operate normally. Can not do it.

  The present invention has been made to solve such a problem. Even when a thermal fuse or the like is not used, when the operation of the semiconductor switching element constituting the output stage of the motor drive unit becomes abnormal, the motor drive unit is provided. An object of the present invention is to provide a motor drive control device capable of preventing abnormal overheating by shutting off the power supply. Also, a motor drive control device that can prevent abnormal overheating and the like in advance by shutting off the power supply to the motor drive unit even when the communication means for transmitting information such as overheat becomes unable to operate normally. The purpose is to provide.

  In order to solve the above problems, a motor drive control device according to the present invention includes a data communication unit, and one or a plurality of output stages are configured based on an operation command supplied from the main control unit via the data communication unit. A motor that controls the power supplied to the motor by controlling the switching operation of the semiconductor switching element, and supplies abnormality information to the main control unit side when an abnormality is detected in the operation state of the semiconductor switching element by the abnormality detection unit Provided with a drive unit, a power cut-off unit that cuts off power supply to the motor drive unit, and a data communication unit, and supplies an operation command to the motor drive unit, and shuts off the power when abnormal information is supplied from the motor drive unit And a main control unit that controls the power supply to the motor drive unit by controlling the unit to a cut-off state or a cut-off state for a certain period of time.

  The abnormality detection unit outputs abnormality information when any of overcurrent, overvoltage, and overtemperature of the semiconductor switching element is detected.

  Each time the motor drive unit receives a data transmission request transmitted from the main control unit side, the motor drive unit transmits information on the operating state of the semiconductor switching element or arbitrary response information to the main control unit side, and the main control unit If the information regarding the operating state of the semiconductor switching element or any response information cannot be received in response to a data transmission request, the power supply to the motor drive unit is cut off by controlling the power cut-off unit to the cut-off state or the cut-off state for a certain period of time. To do.

  The motor driving unit transmits information on the operating state of the semiconductor switching element to the main control unit at a predetermined time interval, and the main control unit transmits information on the operating state of the semiconductor switching element after the predetermined time interval. If the power cannot be received, the power shut-off unit is controlled to be in a shut-off state or a shut-off state for a certain time to cut off the power supply to the motor drive unit.

  In the motor drive device according to the present invention, when any of overcurrent, overtemperature, and overvoltage occurs in the semiconductor switching element in the motor drive unit, abnormality information is supplied to the main control unit, and the power cut-off unit is shut off by the main control unit Controlled. When the operation of the output stage of the motor drive unit becomes abnormal, power supply to the motor drive unit is cut off, so that abnormal overheating and the like can be prevented.

  In addition, when data communication between the main control unit and the motor drive unit is not performed normally, power supply to the motor drive unit is interrupted, so that abnormal operation of the motor drive unit can be prevented.

  Hereinafter, the best mode for carrying out the invention will be described based on examples.

  FIG. 1 is a block diagram showing an embodiment of a motor drive control device according to the present invention. FIG. 1 shows an example in which the motor drive control device according to the present invention is applied to electric fan control of an automotive cooling system. A motor drive control device 1 shown in FIG. 1 includes a direct current motor (hereinafter referred to as a motor) 2 for driving a radiator cooling fan (not shown) and a direct current motor (hereinafter referred to as a motor) for driving a condenser cooling fan (not shown). ) 3 is controlled. The electric fan control device 1 includes a main control unit 10 including an engine electronic control unit (engine ECU), a motor drive unit 20 that drives the motors 2 and 3, and a power source for the motors 2 and 3 and the motor drive unit 20. The power supply cut-off unit 30 that cuts off the supply, the on-vehicle battery power supply 4, the ignition switch 5, the fuses 6 and 7, and the like.

  When the ignition switch 5 is turned on, the battery power supply 4 is supplied to the main control unit 10 via the fuse 6. The main control unit 10 includes an engine control unit (not shown), a power supply unit 11, a motor operation command unit 12, a data communication unit 13, a power cut-off control unit 14, and a transistor 32 constituting a drive circuit for the power cut-off unit 30. And a base resistor 33 and a base-emitter resistor 34. An engine control unit (not shown) controls an engine (not shown) based on signals from various sensors 15 to 18 and the like. The power supply unit 11 receives supply of power from the battery power supply 4 to generate a stabilized power supply VC of, for example, 5 volts and supplies it to each circuit unit.

  The motor operation command unit 12 obtains the required rotation speeds of the motors 2 and 3 based on signals from various sensors (engine coolant temperature sensor 15, vehicle speed sensor 16, refrigerant pressure sensor 17) and air conditioner switch 18 signals. Then, data relating to the required rotation speed is supplied to the motor drive unit 20 via the data communication unit 13.

  The data communication unit 13 performs, for example, asynchronous data serial communication with the data communication unit 22 on the motor drive unit 20 side. The data communication unit 13 generates and transmits transmission data including an error check code or an error correction code. When the data communication unit 13 receives the data transmitted from the motor driving unit 20, the data communication unit 13 checks whether there is an error in the received data based on the error check code or error correction code in the received data. The data communication unit 13 supplies communication abnormality information to the power shutoff control unit 14 when there is an error in received data for a predetermined number of times.

  In addition, the data communication unit 13 transmits a data transmission request to the motor driving unit 20 at a predetermined time interval, and information on the operation state of the semiconductor switching element from the motor driving unit 20 side in response to the data transmission request or arbitrary If the response information is not sent, communication abnormality information is supplied to the power cutoff control unit 14.

  If the motor drive unit 20 is configured to transmit information on the operating state of the semiconductor switching element at a predetermined time interval, the data communication unit 13 receives the information from the motor drive unit 20 even after a predetermined time has elapsed. When reception is not possible, communication abnormality information is supplied to the power cutoff control unit 14.

  The power shut-off control unit 14 controls the power shut-off unit 30 to the non-shut-off state in the initial state when the main control unit 10 is powered on. Thereby, the battery power source 4 is supplied to the motor driving unit 20 via the power cutoff unit 30. The power shut-off control unit 14 is configured to supply power when abnormal information on the output stage is supplied from the motor drive unit 20 via the data communication unit 13 and when communication abnormal information is supplied from the data communication unit 13. The blocking unit 30 is controlled to a blocking state. Thereby, the supply of the battery power supply 4 to the motor drive unit 20 is cut off.

  The motor drive unit 20 includes a power supply unit 21, a data communication unit 22, a PWM control unit 23, an output stage drive unit 24, and an FET (field effect transistor) 25 as a semiconductor switching element that drives one of the motors 2. , An FET (field effect transistor) 26 as a semiconductor switching element for driving the other motor 3, temperature sensors 27 and 28 for detecting the temperatures of the FETs 25 and 26, and an output stage including the FETs 25 and 26, respectively. The abnormality detecting unit 29 for detecting the abnormality, the diode 8 for absorbing the counter electromotive voltage of one motor 2, and the diode 9 for absorbing the counter electromotive voltage of the other motor 3. In FIG. 1, a MOS type FET is exemplified as the semiconductor switching element, but a bipolar transistor, an insulated gate bipolar transistor, or the like may be used as the semiconductor switching element.

  The battery power source 4 is supplied to the motor driving unit 20 via the fuse 7 and the power cutoff unit 30. The power supply unit 21 in the motor drive unit 20 receives supply of power from the battery power supply 4 to generate a stabilized power supply VCC of, for example, 5 volts and supplies it to each circuit unit.

  The data communication unit 22 performs, for example, asynchronous data serial communication with the data communication unit 13 in the main control unit 10. The data communication unit 22 generates and transmits transmission data including an error check code or error correction code. When the data communication unit 22 receives the data transmitted from the main control unit 10, the data communication unit 22 checks the received data for errors based on the error check code or error correction code in the received data. The data communication unit 22 supplies communication abnormality information to the PWM control unit 23 when there is an error in received data for a predetermined number of times.

  Further, when receiving the data transmission request, the data communication unit 22 transmits information on the operation state of the semiconductor switching element or arbitrary response information.

  Note that the data communication unit 22 may transmit information on the operating state of the semiconductor switching element at predetermined time intervals.

  The PWM control unit 23 generates and outputs a PWM signal having a duty ratio corresponding to the requested rotation speed based on data relating to the requested rotation speed of the motor supplied from the main control unit 10 via the data communication unit 22. . The output stage driving unit 24 drives the gates of the FETs 25 and 26 based on the PWM signal supplied from the PWM control unit 23. As a result, the FETs 25 and 26 are switching-driven based on the PWM signal, and the power supplied to the motors 2 and 3 is PWM-controlled. When the communication abnormality information is supplied from the data communication unit 22, the PWM control unit 23 stops outputting the PWM signal.

  The abnormality detection unit 29 includes an overvoltage detection unit 291, an overcurrent detection unit 292, an overtemperature detection unit 293, and an operation abnormality detection unit 294.

  The overvoltage detection unit 291 monitors the voltage supplied to the FETs 25 and 26, and outputs overvoltage detection information when it exceeds a preset allowable voltage. The overvoltage detection unit 291 detects an overvoltage by comparing a voltage obtained by dividing the voltage supplied to each of the FETs 25 and 26 by a resistance voltage dividing circuit with a preset threshold voltage using a comparator or the like. You may do it. The overvoltage detection unit 291 A / D converts the voltage obtained by dividing the voltage supplied to the FETs 25 and 26 by the resistance voltage dividing circuit through the A / D converter, and the A / D converted voltage data. The overvoltage may be determined based on the above.

  The overcurrent detection unit 292 monitors the current (motor current) flowing through the FETs 25 and 26 based on the ON voltage when the FETs 25 and 26 are in the ON state. Output detection information. The current (motor current) flowing through each FET 25, 26 is detected based on the voltage generated at both ends of the current detection resistor by connecting a current detection resistor in series with each FET 25, 26. It may be.

  The overtemperature detection unit 293 monitors the temperature of each FET 25, 26 based on the output of each temperature sensor 27, 28, and outputs overtemperature detection information when it exceeds a preset allowable temperature. The temperature sensors 27 and 28 are provided in the vicinity of the FETs 25 and 26. Each of the temperature sensors 27 and 28 is configured using a heat sensitive resistance element such as a thermistor. Each of the temperature sensors 27 and 28 may be configured by using a diode, and the temperature may be detected from the temperature characteristic of the forward voltage drop of the diode.

  The operation abnormality detector 294 is driven when the ON voltage (drain-source voltage in the ON state) of each of the FETs 25 and 26 when being driven in the ON state exceeds a preset allowable value and in the OFF state. When the drain voltage or leakage current of each of the FETs 25 and 26 is lower than a preset allowable value, operation abnormality detection information indicating that the switching operation of the switching element is abnormal is output.

  When any one of overvoltage, overcurrent, overtemperature, and operation abnormality is detected, the abnormality detection unit 29 supplies the abnormality information to the main control unit 10 side via the data communication unit 22 and outputs the abnormality information to the PWM. It supplies to the control part 23. When the abnormality information is supplied, the PWM control unit 23 stops outputting the PWM signal, and drives the FETs 25 and 26 to the off state via the output stage driving unit 24.

  In a normal operation state in which none of overvoltage, overcurrent, overtemperature, and operation abnormality is detected, the abnormality detection unit 29 sends normal information to the main control unit via the data communication unit 22 in a preset cycle (for example, 1 second cycle). You may make it supply to 10 side.

  The power cutoff unit 30 is configured using a relay (electromagnetic relay) 31. In the initial state in which the ignition switch 5 is operated to be in the on state, the transistor 32 is controlled to be in the on state by the power cutoff control unit 14 in the main control unit 10. As a result, the battery power supply 4 is supplied to the excitation winding 311 of the relay 31 and the contact 312 of the relay 31 is closed. Accordingly, the battery power supply 4 is supplied to the motor drive unit 20 via the fuse 7 and the contact 312 of the relay 31.

  When the abnormality information is supplied from the motor drive unit 20 side, the power shut-off control unit 14 controls the transistor 32 to be in an off state and opens the contact 312 of the relay 31 so that the power shut-off unit 30 is shut off. To. Thereby, supply of the battery power supply 4 with respect to the motor drive part 20 is interrupted | blocked.

  Next, the operation of the first embodiment will be described. When the ignition switch 5 is turned on and the battery power 4 is supplied to the main control unit 10, the power cut-off control unit 14 in the main control unit 10 drives the relay 31 in the power cut-off unit 30 to drive the motor. The battery power supply 4 is supplied to the unit 20. The required rotation speed of each of the motors 2 and 3 is obtained by the motor operation command section 12 in the main control section 10, and data (operation command) relating to the requested rotation speed is supplied to the motor drive section 20 via the data communication section 13. . The PWM control unit 23 in the motor drive unit 20 obtains a duty ratio corresponding to the required rotational speed by referring to a correspondence table between the rotational speed and the duty ratio and generates a PWM signal having a duty ratio corresponding to the required rotational speed. Then, the FETs 25 and 26 are driven via the output stage driving unit 24. The duty ratio corresponding to the required rotation speed may be obtained on the motor operation command unit 12 side, and the duty ratio may be supplied to the motor drive unit 20 side. As a result, the motors 2 and 3 are rotated at the required rotational speed, and the cooling fans (not shown) are rotated. Note that when starting the motors 2 and 3, the PWM control unit 23 performs soft start processing that gradually increases the duty ratio of the PWM signal so as to reduce the inrush current at the time of starting the motor. Yes.

  The abnormality detection unit 29 continuously monitors the operation states of the FETs 25 and 26 that drive the motors 2 and 3, and if an overvoltage, overcurrent, overtemperature, or operation abnormality is detected, an abnormality in the output stage is detected. Is supplied to the main control unit 10 via the data communication unit 22.

  FIG. 2 is a flowchart showing a power shut-off process for an output stage abnormality of the motor drive unit. When the power cutoff control unit 14 in the main control unit 10 receives data supplied from the motor drive unit 20 via the data communication unit 13 (step S1), the output of the motor drive unit 20 based on the received data. It is determined whether or not the stage is abnormal (step S2). And when abnormality information is received, the power supply to the motor drive part 20 is interrupted | blocked via the power cutoff part 30 (step S3). As a result, it is possible to prevent the abnormal state of the output stage from continuing, so that abnormal overheating of the FETs 25 and 26 constituting the output stage can be prevented.

  The power shutoff control unit 14 may resume power supply to the motor drive unit 20 after shutting off the power supply to the motor drive unit 20 for a predetermined time (for example, several seconds) when the abnormality information is received. . For example, when an overcurrent is generated due to the locking of the motors 2 and 3, the locked state may be canceled by restarting the driving of the motors 2 and 3. Further, the power shut-off control unit 14 counts the number of times the power supply to the motor drive unit 20 is shut off for a predetermined time. When the power cut-off control unit 14 reaches a predetermined number of times (for example, 3 times), You may make it completely block.

  FIG. 3 is a flowchart showing the power-off process when communication is abnormal. The main control unit 10 transmits a data transmission request to the motor driving unit 20 (step S11). Then, in response to this data transmission request, it is checked whether information regarding the operating state of the semiconductor switching element or arbitrary response information is transmitted from the motor drive unit 20 side (step S12). When the main control unit 10 cannot receive data from the motor drive unit 20 side, the main control unit 10 cuts off the power supply to the motor drive unit 20 (step S13).

  If the motor drive unit 20 is configured to transmit information on the operating state of the semiconductor switching element at a predetermined time interval, the main control unit 10 does not receive information from the motor drive unit 20 even after a predetermined time has elapsed. When reception is not possible, power supply to the motor drive unit 20 is shut off.

  When the power supply to the motor drive unit 20 is cut off, the main control unit 10 may cause a display unit (not shown) to display that the motor drive unit 20 is abnormal. The main control unit 10 may supply abnormality information to a vehicle diagnosis apparatus (not shown) and store the occurrence date and time of the abnormal state of the motor drive unit 20 and the content of the abnormality.

  FIG. 4 is a block diagram showing another embodiment of the motor drive control device according to the present invention. FIG. 4 shows an example in which the motor drive control device according to the present invention is applied to blower fan control of an automotive air conditioner. A motor drive control device 40 according to the second embodiment includes a main control unit 41 including an automatic air conditioner electronic control unit (auto air conditioner ECU), a direct current motor (hereinafter referred to as a motor) 42 that drives a blower fan (not shown), and a motor. The motor drive part 43 which drives 42, and the power supply interruption | blocking part 30 grade | etc., Are comprised.

  A motor operation command unit 44 in the main control unit 41 determines a requested rotation speed of the blower fan driving motor 42 based on a setting condition of an air conditioner operation panel unit (not shown), and transmits data relating to the requested rotation speed to the data communication unit 45. To the motor drive unit 43. The PWM control unit 46 in the motor drive unit 43 generates a PWM signal having a duty ratio corresponding to the requested rotation speed based on the data regarding the requested rotation speed received via the data communication unit 47, and outputs the output stage drive unit 48. The FET 25 is driven to switch through Thereby, the electric power supplied to the motor 42 is PWM-controlled, and the rotation speed of the motor 42 is controlled.

  The abnormality detection unit 49 continuously monitors the operation state of the FET 25 that drives the motor 42, and when each of the detection units 491, 492, 493, and 494 detects overvoltage, overcurrent, overtemperature, and operation abnormality. Then, information indicating abnormality in the output stage (abnormal information) is supplied to the main control unit 41 side via the data communication unit 47.

  Between the data communication units 45 and 47, bi-directional serial data communication is performed by a start-stop synchronization method via a data line (BUS) 50. The communication protocol is compliant with LIN (Local Interconnect Network).

  When the data communication unit 45 on the main control unit 41 side receives the data transmitted from the motor drive unit 43, the data communication unit 45 checks the received data for errors based on the error check code or error correction code in the received data, If there is an error in received data for a predetermined number of times, communication abnormality information is supplied to the power shutoff control unit 14. The data communication unit 45 transmits a data transmission request for requesting data transmission from the motor driving unit 43 side at a predetermined time interval, and the operation state of the semiconductor switching element from the motor driving unit 43 side in response to the transmission request. If no information or arbitrary response information is sent, communication abnormality information is supplied to the power shutoff control unit 14. When the motor drive unit 43 is configured to transmit information on the operation state of the semiconductor switching element at a predetermined time interval, the data communication unit 45 on the main control unit 41 side is configured so that the motor drive unit When the information from the 43 side cannot be received, the communication abnormality information is supplied to the power cutoff control unit 14.

  When receiving the abnormality information and the communication abnormality information, the power cutoff control unit 14 in the main control unit 41 controls the power cutoff unit 30 to the power cutoff state. The power cutoff control unit 14 may resume the power supply to the motor drive unit 43 after blocking the power supply to the motor drive unit 43 for a predetermined time (for example, several seconds). For example, when an overcurrent is generated due to the locking of the motor 42, the locked state may be canceled by restarting the driving of the motor 42. Further, the power shut-off control unit 14 counts the number of times the power supply to the motor drive unit 20 is shut off for a predetermined time. When the power cut-off control unit 14 reaches a predetermined number (for example, 3 times), the power supply control to the motor drive unit 43 is performed. You may make it completely block. As a result, it is possible to prevent the abnormal state of the output stage from continuing, so that abnormal overheating of the FET 25 constituting the output stage can be prevented.

  FIG. 5 is a block diagram showing still another embodiment of the motor drive control device according to the present invention. FIG. 5 shows an example in which the motor drive control device according to the present invention is applied to drive control of a brushless motor. A motor drive control device 60 shown in the third embodiment includes a main control unit 41 including an automatic air conditioner electronic control unit (auto air conditioner ECU), a brushless motor (hereinafter referred to as a motor) 61 that drives a blower fan (not shown), a motor The motor drive part 62 which drives 61, and the power supply interruption | blocking part 30 grade | etc., Are comprised.

  The motor driving unit 62 includes a power source unit 21, an inverter circuit unit 63 formed by connecting six semiconductor switching elements (for example, FETs) in a three-phase bridge, and a current detector 64 that detects a current of each phase of the motor 61. , 65, 66, one or more temperature sensors 67 for detecting the temperature of the inverter circuit unit 63, an abnormality detection unit 68 for monitoring the operation state of the inverter circuit unit 63 and detecting an abnormality, and a data communication unit 47, an inverter PWM control unit 69, and an output stage driving unit 70.

  The inverter PWM control unit 69 includes six semiconductor switching elements (e.g., FETs) constituting each arm of the inverter circuit unit 63 based on a motor operation command such as required motor speed data supplied from the main control unit 41 side. ) Are switched, and each semiconductor switching element (for example, FET) of the inverter circuit unit 63 is switched and driven via the output stage driving unit 70.

  The abnormality detection unit 68 continuously monitors the operation state of the inverter circuit unit 63, and each detection unit 681, 682, 683, 684 detects overvoltage, overcurrent, overtemperature, and switching operation abnormality of each semiconductor switching element. When detected, information (abnormal information) indicating abnormality of the inverter circuit unit 63 is supplied to the main control unit 41 side via the data communication unit 47.

  When receiving the abnormality information, the power cutoff control unit 14 on the main control unit 41 side controls the power cutoff unit 30 to the power cutoff state. Thereby, it is avoided that the abnormal operation state of the inverter circuit unit 63 continues, and abnormal overheating of each semiconductor switching element constituting the inverter circuit unit 63 can be prevented. Moreover, the main control part 41 controls the power-supply-cutoff part 30 to a power-supply-cutoff state, when the data from the motor drive part 62 cannot be received normally.

  In each embodiment, an example in which the power cutoff unit 30 is configured using the relay 31 has been described. However, the power cutoff unit 30 may be configured using a semiconductor switching element.

  In addition, although each Example illustrated the drive control apparatus of the electric fan motor for motor vehicles, the motor drive control apparatus which concerns on this invention is applicable to various uses other than a motor vehicle.

It is a block diagram of a motor drive control device. (Example 1) It is a flowchart of the power-supply-cutoff process at the time of motor drive part output stage abnormality. It is a flowchart of the power-off process at the time of communication abnormality. It is a block diagram of a motor drive control device. (Example 2) It is a block diagram of a motor drive control device. Example 3

Explanation of symbols

1, 40, 60 Motor drive control device 2, 3, 42, 61 Motor 4 Battery power supply 10, 41 Main control unit 12, 44 Motor operation command unit 13, 22, 45, 47 Data communication unit 14 Power shut-off control unit 20, 43, 62 Motor drive unit 23, 46 PWM control unit 24, 48, 70 Output stage drive unit 25, 26 Semiconductor switching element (FET)
27, 28, 67 Temperature sensor 29, 49, 68 Abnormality detection unit 30 Power cut-off unit 63 Inverter circuit unit 64, 65, 66 Current detector 69 Inverter PWM control unit

Claims (4)

Electric power provided with a data communication unit and supplied to the motor by controlling the switching operation of one or a plurality of semiconductor switching elements constituting the output stage based on an operation command supplied from the main control unit side via the data communication unit A motor driving unit that supplies abnormality information to the main control unit when an abnormality is detected in the operation state of the semiconductor switching element by the abnormality detection unit;
A power cutoff unit that cuts off power supply to the motor drive unit;
A data communication unit for supplying the operation command to the motor drive unit, and when the abnormality information is supplied from the motor drive unit, controlling the power cut-off unit to a cut-off state or a cut-off state for a certain period of time. A motor drive control device comprising: a main control unit that cuts off power supply to the motor drive unit.   The motor drive control device according to claim 1, wherein the abnormality detection unit outputs the abnormality information when any of overcurrent, overvoltage, and overtemperature of the semiconductor switching element is detected.   Each time the motor drive unit receives a data transmission request transmitted from the main control unit side, the motor drive unit transmits information on the operating state of the semiconductor switching element or arbitrary response information to the main control unit side, and When the control unit cannot receive information on the operation state of the semiconductor switching element or arbitrary response information in response to the data transmission request, the control unit controls the power shut-off unit to a shut-off state or a shut-off state for a certain period of time. The motor drive control device according to claim 1, wherein power supply to the motor is cut off. The motor driving unit transmits information regarding the operating state of the semiconductor switching element to the main control unit at a predetermined time interval, and the main control unit transmits information regarding the operating state of the semiconductor switching element to the predetermined time interval. 2. The motor drive control according to claim 1, wherein if the signal cannot be received even after the first time, the power cut-off unit is controlled to a cut-off state or a cut-off state for a predetermined time to cut off the power supply to the motor drive unit. apparatus.

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