JP7160056B2 - Power converter control circuit - Google Patents

Description

The present invention provides a system comprising a first power supply, a multiphase rotating electrical machine, and a power converter electrically connected to each phase winding of the rotating electrical machine and the first power supply and having switches on upper and lower arms. It relates to a control circuit for an applied power converter.

As this type of control circuit, when it is determined that an abnormality has occurred in the system, there is known one that performs shutdown control for forcibly switching off the switches of the upper and lower arms. When shutdown control is performed, if counter electromotive voltage is generated in the windings due to the rotation of the rotor that constitutes the rotating electrical machine, the line voltage of the windings may be higher than the voltage of the first power supply. be. A situation in which the line voltage becomes high can occur, for example, when the field magnetic flux amount of the rotor is large or when the rotational speed of the rotor is high.

When the line-to-line voltage of the winding becomes higher than the voltage of the first power supply, even if shutdown control is performed, the closed circuit including the diode connected in anti-parallel to the switch, the winding, and the first power supply is closed. So-called regeneration is performed in which the induced current generated in the line flows. As a result, the DC voltage on the first power supply side of the power converter rises significantly, and there is concern that at least one of the first power supply, the power converter, and devices other than the power converter connected to the first power supply may fail. .

In order to deal with such problems, as described in Patent Document 1, the on-side switch on one of the upper and lower arms is turned on, and the off-side switch on the other arm is turned off. Control circuits that perform short-circuit control are known. Specifically, this control circuit is operable by being supplied with power from the power supply unit, and has an output stage drive control section. The output stage drive control section performs the above short-circuit control. Here, in preparation for the case where an abnormality occurs in the power supply unit, the control circuit includes a drive power supply capable of supplying the power of the first power supply independent of the power supply unit to the output stage drive control section. Power is supplied from this drive power supply to the gate of the on-side switch.

Japanese Patent Publication No. 2013-506390

In the configuration described in Patent Document 1, the power of the driving power supply is supplied only to the gate of the on-side switch, out of the on-side switch and the off-side switch. Therefore, in short-circuit control, the on-side switch is driven and controlled to be in the on state, but the off-side switch is inadvertently turned off in a state in which the gate voltage is not controlled.

Here, in order to suppress the occurrence of the upper and lower arm short-circuits when performing short-circuit control, it is required to wait for the off-side switch to turn off before switching the on-side switch to the on state. However, when switching the on-side switch to the on state after waiting for the off-side switch to turn off by chance, the time from the occurrence of an abnormality in the system to the execution of short-circuit control becomes long.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a power converter control circuit that can quickly perform short-circuit control when an abnormality occurs in the system.

The present invention includes a first power source;
a multiphase rotating electric machine;
A power converter control circuit applied to a system comprising a power converter electrically connected to each phase winding of the rotating electric machine and the first power supply and having switches on upper and lower arms,
The system includes a second power supply and a third power supply that serve as power supply sources for the control circuit,
an abnormality determination unit that determines whether an abnormality has occurred in the system;
When the abnormality determination unit determines that an abnormality has occurred, the switch in either one of the upper and lower arms uses power generated by at least one of the second power supply and the third power supply. an abnormality time control unit that performs short-circuit control that drives and controls the on-side switch to the on state and drives and controls the off-side switch, which is the switch on the other arm, to the off state.

The system is provided with a second power supply and a third power supply that serve as power supply sources for the control circuit. Therefore, even if one of the second power supply and the third power supply cannot be used as the power supply source for the control circuit, the other power supply can be used as the power supply source. Thereby, short-circuit control can be performed. Further, since the other power source can be used as a power supply source, for example, normal control for controlling the control amount of the rotating electric machine to the command value can be continued without performing short-circuit control.

Further, in the present invention, when it is determined that an abnormality has occurred in the system, in the short-circuit control, the power generated by at least one of the second power supply and the third power supply is used to drive and control the on-side switch to the on state. and the off-side switch is driven and controlled to be in the off state. Therefore, compared to a configuration in which the ON-side switch is turned ON after waiting for the OFF-side switch to turn OFF by chance, short-circuit control can be performed quickly when an abnormality occurs in the system. .

1 is an overall configuration diagram of a control system according to a first embodiment; FIG. The figure which shows a control circuit and its peripheral structure. FIG. 4 is a diagram showing upper and lower arm drivers and their peripheral configuration; 4 is a flow chart showing a processing procedure of three-phase short-circuit control and shutdown control; 10 is a flowchart showing processing procedures of three-phase short-circuit control and shutdown control according to the second embodiment;

<First embodiment>
A first embodiment embodying a control circuit according to the present invention will be described below with reference to the drawings. The control circuit according to this embodiment is applied to a three-phase inverter as a power converter. In this embodiment, a control system including an inverter is installed in a vehicle such as an electric vehicle or a hybrid vehicle.

As shown in FIG. 1 , the control system includes a rotating electric machine 10 and an inverter 15 . The rotary electric machine 10 is an in-vehicle main machine, and its rotor can transmit power to drive wheels (not shown). In this embodiment, a synchronous machine is used as the rotary electric machine 10, and more specifically, a permanent magnet synchronous machine is used.

The inverter 15 has a switching device section 20 . The switching device section 20 includes serially connected bodies of upper arm switches SWH and lower arm switches SWL for three phases. In each phase, the first end of the winding 11 of the rotary electric machine 10 is connected to the connection point between the upper and lower arm switches SWH and SWL. A second end of each phase winding 11 is connected at a neutral point. The phase windings 11 are arranged with an electrical angle of 120 degrees from each other. Incidentally, in this embodiment, voltage-controlled semiconductor switching elements, more specifically, IGBTs, are used as the switches SWH and SWL. Upper and lower arm diodes DH and DL, which are freewheel diodes, are connected in anti-parallel to the upper and lower arm switches SWH and SWL.

A positive terminal of a high-voltage power supply 30 as a "first power supply" is connected to a collector, which is a high-potential-side terminal of each upper arm switch SWH, via a high-potential-side electric path 22H. A negative terminal of a high-voltage power supply 30 is connected to an emitter, which is a low-potential side terminal of each lower arm switch SWL, via a low-potential side electric path 22L. In this embodiment, the high-voltage power supply 30 is a secondary battery, and its output voltage (rated voltage) is, for example, 100 V or higher. In addition, in this embodiment, the high-voltage power supply 30 corresponds to the "first power supply".

A first cutoff switch 23a is provided in the high potential side electric path 22H, and a second cutoff switch 23b is provided in the low potential side electric path 22L. Each switch 23a, 23b is, for example, a relay or a semiconductor switching element. Here, each switch 23a, 23b may be driven by the control circuit 50 provided in the inverter 15, or may be driven by a host ECU (not shown). The high-level ECU is a high-level control device with respect to the control circuit 50 .

The inverter 15 has a smoothing capacitor 24 . The smoothing capacitor 24 electrically connects the high potential side electrical path 22H closer to the switching device section 20 than the first cutoff switch 23a and the low potential side electrical path 22L closer to the switching device section 20 than the second cutoff switch 23b. properly connected.

The control system comprises on-board electrical equipment 25 . The electrical device 25 includes, for example, at least one of an electric compressor and a DCDC converter. The electric compressor constitutes a vehicle interior air conditioner, and is powered by a high-voltage power supply 30 and driven to circulate the refrigerant in the vehicle-mounted refrigeration cycle. The DCDC converter steps down the output voltage of the high-voltage power supply 30 and supplies it to an in-vehicle low-voltage load. The low-voltage load includes a low-voltage power supply 31 as a "second power supply" shown in FIG. In this embodiment, the low-voltage power supply 31 is a secondary battery whose output voltage (rated voltage) is lower than the output voltage (rated voltage) of the high-voltage power supply 30 (for example, 12 V), such as a lead-acid battery.

As shown in FIGS. 1 and 2, the control system includes phase current sensors 40 and angle sensors 41 . Phase current sensor 40 outputs a current signal corresponding to at least two phase currents among the phase currents flowing in rotating electric machine 10 . The angle sensor 41 outputs an angle signal corresponding to the electrical angle of the rotating electric machine 10 . The angle sensor 41 is, for example, a resolver, an encoder, or an MR sensor having a magnetoresistive element, and is a resolver in this embodiment.

As shown in FIGS. 1 and 2 , the inverter 15 has a discharge resistor 26 and a discharge switch 27 . The discharge resistor 26 and the discharge switch 27 are connected in series. This series connection connects the high potential side electrical path 22H closer to the switching device section 20 than the first cutoff switch 23a and the low potential side electrical path 22L closer to the switching device section 20 than the second cutoff switch 23b. electrically connected. Specifically, the drain, which is the high potential side terminal of the discharge switch 27, is connected to one end of the discharge resistor 26, and the source, which is the low potential side terminal of the discharge switch 27, is connected to the low potential side electrical path 22L. . Discharge switch 27 is driven by an instruction from control circuit 50 .

Next, the configuration of the control circuit 50 will be described with reference to FIG. The control circuit 50 has an input circuit 61 . The input portion of the input circuit 61 is connected to the positive terminal of the low-voltage power supply 31 . A ground is connected to the negative terminal of the low-voltage power supply 31 as a ground portion.

The control circuit 50 includes a first diode 62a, a second diode 62b, and a backup power supply circuit 63 as a "third power supply". The backup power supply circuit 63 generates the backup power supply voltage Vbps by being supplied with the output voltage of the smoothing capacitor 24 under the condition that the first and second cutoff switches 23a and 23b are turned on. Various power supplies can be used as the backup power supply circuit 63, and for example, a switching power supply can be used. The high potential side of the smoothing capacitor 24 is connected to the input portion of the backup power supply circuit 63 .

The output of the input circuit 61 is connected to the anode of the first diode 62a. The output of the backup power supply circuit 63 is connected to the anode of the second diode 62b. The cathode of the second diode 62b is connected to the cathode of the first diode 62a. Hereinafter, the voltage on the cathode side of each diode 62a, 62b may be referred to as the low-voltage power supply voltage VB.

The control circuit 50 includes an intermediate power supply circuit 64 , a main power supply circuit 65 as a “first power generator”, and a first power supply circuit 66 . Cathodes of first and second diodes 62 a and 62 b are connected to the intermediate power supply circuit 64 . The intermediate power supply circuit 64 generates an intermediate voltage (eg, 6V) by stepping down the supplied low-voltage power supply voltage VB. The main power supply circuit 65 reduces the output voltage of the intermediate power supply circuit 64 to generate a main power supply voltage Vm (eg, 5V). The first power supply circuit 66 steps down the output voltage of the intermediate power supply circuit 64 to generate the first voltage Va. In this embodiment, the first voltage Va is set to a value (for example, 1 V) lower than the main power supply voltage Vm. Various power supply circuits can be used as the intermediate power supply circuit 64 , the main power supply circuit 65 and the first power supply circuit 66 . For example, a switching power supply can be used as the intermediate power supply circuit 64 and the first power supply circuit 66 , and a series power supply can be used as the main power supply circuit 65 .

The control circuit 50 includes a sub-power supply circuit 67 as a “second power generator” and a second power supply circuit 68 . The sub-power supply circuit 67 is connected to the cathodes of the first and second diodes 62a and 62b. The sub-power supply circuit 67 generates a sub-power supply voltage (eg, 5V) by stepping down the supplied low-voltage side power supply voltage VB. In this embodiment, the sub power supply voltage Vs has the same value as the main power supply voltage Vm, but it is not essential that the sub power supply voltage Vs has the same value as the main power supply voltage Vm.

Cathodes of the first and second diodes 62 a and 62 b are connected to the second power supply circuit 68 . The second power supply circuit 68 generates a second voltage Vr (eg, 30 V) by boosting the supplied low-voltage power supply voltage VB.

The input circuit 61, the first and second diodes 62a and 62b, and the power supply circuits 64-68 are provided in the low voltage region of the control circuit 50. FIG. The backup power supply circuit 63 is provided in the low-voltage region and the high-voltage region across the boundary between the low-voltage region and the high-voltage region in the control circuit 50 .

The control circuit 50 has an interface section 70 and a resolver digital converter 71 in its low voltage region. The interface section 70 is configured to be operable by being supplied with the second voltage Vr of the second power supply circuit 68 . The interface unit 70 transmits a sinusoidal excitation signal from the resolver digital converter 71 to the angle sensor 41 and transmits an angle signal from a resolver stator forming the angle sensor 41 to the resolver digital converter 71 . The resolver-to-digital converter 71 is configured to be operable when supplied with the main power supply voltage Vm of the main power supply circuit 65 . The resolver-to-digital converter 71 calculates the electrical angle θe of the rotary electric machine 10 based on the angle signal from the interface section 70 . The calculated electrical angle θe is input to the main MCU 72 and sub MCU 73 .

The main MCU 72 and sub MCU 73 are provided in the low voltage region of the control circuit 50 . Each MCU 72, 73 comprises a CPU and other peripheral circuits. The peripheral circuit includes, for example, an input/output unit for exchanging signals with the outside and an AD conversion unit. The main MCU 72 is configured to be operable by being supplied with the main power supply voltage Vm of the main power supply circuit 65 and the first voltage Va of the first power supply circuit 66 . The sub MCU 73 is configured to be operable by being supplied with the sub power supply voltage Vs of the sub power supply circuit 67 . A current signal Iph output from the phase current sensor 40 is input to the main MCU 72 and the sub MCU 73 .

The control circuit 50 comprises first and second CAN transceivers 74, 75 in its low voltage area. The first CAN transceiver 74 is configured to be operable by being supplied with the main power supply voltage Vm of the main power supply circuit 65 . The second CAN transceiver 75 is configured to be operable by being supplied with the sub power supply voltage Vs of the sub power supply circuit 67 .

The main MCU 72 exchanges information with the host ECU via the first CAN transceiver 74 and a first CAN bus (not shown). Specifically, the main MCU 72 acquires a command value for the control amount of the rotating electric machine 10 from the host ECU via the first CAN transceiver 74 and the first CAN bus. The sub MCU 73 exchanges information with the host ECU via the second CAN transceiver 75 and a second CAN bus (not shown).

The control circuit 50 comprises a first logic circuit 76 and a second logic circuit 77 in its low voltage region. The first logic circuit 76 is configured to be operable by being supplied with the main power supply voltage Vm of the main power supply circuit 65 . The sub power supply voltage Vs of the sub power supply circuit 67 is input to the first logic circuit 76 .

The second logic circuit 77 is configured to be operable by being supplied with the sub power supply voltage Vs of the sub power supply circuit 67 . The main power supply voltage Vm of the main power supply circuit 65 and the first voltage Va of the first power supply circuit 66 are input to the second logic circuit 77 .

In this embodiment, the main MCU 72 and the first logic circuit 76 correspond to the "first state control section", and the sub MCU 73 and the second logic circuit 77 correspond to the "second state control section".

The control circuit 50 has a voltage sensor 78 and an overvoltage detector 79 . The voltage sensor 78 is electrically connected to the high potential side electric path 22</b>H and the low potential side electric path 22</b>L, and detects the high voltage side power supply voltage Vdc, which is the terminal voltage of the smoothing capacitor 24 . The detected high-voltage power supply voltage Vdc is input to the overvoltage detector 79 , the main MCU 72 and the sub MCU 73 .

The overvoltage detector 79 is configured to be operable by being supplied with the sub power supply voltage Vs of the sub power supply circuit 67 . The overvoltage detector 79 determines whether or not the detected high-side power supply voltage Vdc exceeds the upper limit voltage. The overvoltage detector 79 outputs an overvoltage signal Sovh to the main MCU 72 , the sub MCU 73 and the first logic circuit 76 when determining that the high-voltage power supply voltage Vdc exceeds the upper limit voltage.

The control circuit 50 has a velocity detector 80 in its low voltage region. Speed detector 80 is configured to be operable by being supplied with sub power supply voltage Vs of sub power supply circuit 67 . Speed detector 80 detects rotational speed Nr of the rotor of rotating electric machine 10 . The detected rotation speed Nr is input to the main MCU 72 and sub MCU 73 .

The control circuit 50 has a main monitoring section 81 and a sub-monitoring section 82 in its low voltage region. The main monitoring section 81 and the sub-monitoring section 82 are configured to be operable by being supplied with the low-voltage power supply voltage VB.

The main monitoring unit 81 has a function of monitoring whether or not an abnormality has occurred in the main MCU 72, and is composed of, for example, a watchdog counter (WDC). The main monitoring unit 81 outputs a main abnormality signal Sgfm to the second logic circuit 77 when determining that the main MCU 72 is abnormal.

The sub-monitoring unit 82 has a function of monitoring whether or not the sub-MCU 73 is abnormal, and is composed of, for example, a function watchdog counter (F-WDC). When the sub-monitoring unit 82 determines that the sub-MCU 73 is abnormal, it outputs a sub-abnormality signal Sgfs to the main MCU 72 . Note that the sub-monitoring unit 82 is not limited to the F-WDC, and may be configured by, for example, a WDC or a window watchdog counter (W-WDC).

The control circuit 50 includes an upper arm insulated power supply circuit 90 as an “upper arm drive power supply”, a lower arm insulated power supply circuit 91 as a “lower arm drive power supply”, an upper arm driver 92 and a lower arm driver 93 . Each of the isolated power supply circuits 90 and 91 and each of the drivers 92 and 93 are provided in the low voltage region and the high voltage region across the boundary between the low voltage region and the high voltage region in the control circuit 50 . In this embodiment, the upper arm driver 92 is individually provided corresponding to each upper arm switch SWH, and the lower arm driver 93 is individually provided corresponding to each lower arm switch SWL. Therefore, a total of six drivers 92 and 93 are provided.

Cathodes of the first and second diodes 62a and 62b are connected to the isolated power supply circuits 90 and 91, respectively. The upper arm isolated power supply circuit 90 generates and outputs an upper arm drive voltage VdH to be supplied to an upper arm driver 92 based on the supplied low-voltage power supply voltage VB. The upper arm isolated power supply circuit 90 is individually provided for each of the three-phase upper arm drivers 92 . Information on the upper arm drive voltage VdH of the upper arm isolated power supply circuit 90 is input to the first logic circuit 76 .

The lower arm insulated power supply circuit 91 generates and outputs a lower arm drive voltage VdL to be supplied to the lower arm driver 93 based on the supplied low voltage side power supply voltage VB. In this embodiment, a common lower arm insulated power supply circuit 91 is provided for a three-phase lower arm driver 93 . Information on the lower arm drive voltage VdL of the lower arm isolated power supply circuit 91 is input to the first logic circuit 76 . Note that the lower arm isolated power supply circuit 91 may be provided individually for each of the three-phase lower arm drivers 93 .

The control circuit 50 has an OR circuit 83 in its low voltage region. Switching commands from the first and second logic circuits 76 and 77 are input to the OR circuit 83 . The OR circuit 83 outputs an ON command to the upper arm driver 92 when at least one of the switching commands output from the first and second logic circuits 76 and 77 is an ON command. On the other hand, the OR circuit 83 outputs an OFF command to the upper arm driver 92 when both switching commands output from the first and second logic circuits 76 and 77 are OFF commands.

The main MCU 72 generates a switching command for each of the switches SWH and SWL of the switching device section 20 in order to control the control amount of the rotary electric machine 10 to the obtained command value. The controlled variable is, for example, torque. The main MCU 72 generates a switching command based on the acquired electrical angle θe, current signal Iph, and the like. The main MCU 72 outputs a switching command to the upper arm driver 92 via the first logic circuit 76 and the OR circuit 83 and outputs a switching command to the lower arm driver 93 via the first logic circuit 76 . Note that the main MCU 72 generates a switching command for alternately turning on the upper arm switch SWH and the lower arm switch SWL in each phase. In this embodiment, the main MCU 72 includes a "switch command generator".

Next, the upper and lower arm drivers 92, 93 will be described with reference to FIG.

The upper arm driver 92 includes an upper arm driving portion 92a and an upper arm insulating transmission portion 92b. The upper arm driving portion 92a is provided in the high pressure region. The upper arm insulating transmission portion 92b is provided in the low-voltage region and the high-voltage region across the boundary between the low-voltage region and the high-voltage region. The upper arm insulating transmission section 92b electrically isolates the low voltage region and the high voltage region while transmitting the switching command output from the OR circuit 83 to the upper arm driving section 92a. The upper arm insulating transmission portion 92b is, for example, a photocoupler or a magnetic coupler.

In the upper arm driver 92, the configuration of the upper arm drive section 92a and the upper arm insulation transmission section 92b on the high-voltage region side is made operable by being supplied with the upper arm drive voltage VdH of the upper arm insulation power supply circuit 90. It is configured. In the upper arm driver 92, the structure of the upper arm insulating transmission portion 92b on the low voltage region side is configured to be operable by being supplied with the sub power supply voltage Vs of the sub power supply circuit 67. FIG.

The upper arm drive section 92a supplies charging current to the gate of the upper arm switch SWH when the input switching command is an ON command. As a result, the gate voltage of the upper arm switch SWH becomes equal to or higher than the threshold voltage Vth, and the upper arm switch SWH is turned on. On the other hand, when the input switching command is an OFF command, the upper arm driving section 92a causes a discharge current to flow from the gate of the upper arm switch SWH to the emitter side. As a result, the gate voltage of the upper arm switch SWH becomes less than the threshold voltage Vth, and the upper arm switch SWH is turned off.

The upper arm driving section 92a transmits information such as an upper arm fail signal SgfH, which is information indicating that an abnormality has occurred in the upper arm switch SWH, to the main MCU 72, the sub MCU 73, and the main MCU 73, the sub MCU 73, and the upper arm switch SWH through the upper arm insulating transmission section 92b. 1 to the logic circuit 76 . The abnormality of the upper arm switch SWH includes at least one of an overheat abnormality, an overvoltage abnormality, and an overcurrent abnormality.

The lower arm driver 93 includes a lower arm driving portion 93a and a lower arm insulating transmission portion 93b. In this embodiment, the configurations of the drivers 92 and 93 are basically the same. Therefore, detailed description of the lower arm driver 93 will be omitted as appropriate below.

In the lower arm driver 93, the configuration of the lower arm drive section 93a and the lower arm insulation transmission section 93b on the high voltage region side, etc. are made operable by being supplied with the lower arm drive voltage VdL of the lower arm insulation power supply circuit 91. It is configured. In the lower arm driver 93, the structure of the lower arm insulating transmission portion 93b on the low voltage region side is configured to be operable when the main power supply voltage Vm of the main power supply circuit 65 is supplied.

The lower arm driving section 93a supplies charging current to the gate of the lower arm switch SWL when the input switching command is an ON command. As a result, the gate voltage of the lower arm switch SWL becomes equal to or higher than the threshold voltage Vth, and the lower arm switch SWL is turned on. On the other hand, when the input switching command is an OFF command, the lower arm drive section 93a causes a discharge current to flow from the gate of the lower arm switch SWL to the emitter side. As a result, the gate voltage of the lower arm switch SWL becomes less than the threshold voltage Vth, and the lower arm switch SWL is turned off.

The lower arm driving section 93a transmits information such as the lower arm fail signal SgfL, which is information indicating that the lower arm switch SWL has an abnormality, via the lower arm insulating transmission section 93b to the main MCU 72, the sub MCU 73, and the third control unit. 1 to the logic circuit 76 . The abnormality of the lower arm switch SWL includes at least one of overheat abnormality, overvoltage abnormality and overcurrent abnormality.

Returning to the description of FIG. 2 , the control circuit 50 includes an insulation transfer section 100 and a discharge processing section 101 . The insulation transmission part 100 is provided in the low-voltage region and the high-voltage region across the boundary between the low-voltage region and the high-voltage region. The insulation transfer unit 100 transfers the discharge command CmdAD output from the main MCU 72 or the sub MCU 73 to the discharge processing unit 101 while electrically insulating the low voltage region and the high voltage region. The insulation transfer unit 100 is, for example, a photocoupler or a magnetic coupler. The structure of the insulation transfer section 100 on the high voltage region side is configured to be operable by being supplied with, for example, the lower arm drive voltage VdL, and the structure of the insulation transfer section 100 on the low voltage region side is supplied with, for example, the main power supply voltage Vm. It is configured to be operable by

The discharge processing unit 101 is provided in the high voltage region of the control circuit 50 and configured to be operable by being supplied with the lower arm drive voltage VdL. When the discharge command CmdAD is input, the discharge processing unit 101 performs drive control of the discharge switch 27 and discharge control of the smoothing capacitor 24 .

In this embodiment, three-phase short-circuit control (ASC: Active Short Circuit) can be performed when various configurations within the control circuit 50 or an abnormality outside the control circuit 50 occurs. Such an anomaly occurs, for example, due to a vehicle collision. The three-phase short-circuit control will be described below for each location where an abnormality occurs, along with an explanation of the effects.

(A) Low-voltage power supply 31 and input circuit 61
An abnormality that prevents power supply from the low-voltage power supply 31 to the control circuit 50 or an abnormality in the input circuit 61 may occur. Hereinafter, such an anomaly will be referred to as an anomaly (A). In this embodiment, in addition to the low-voltage power supply 31, a backup power supply circuit 63 is provided in preparation for the case where the abnormality (A) occurs. This ensures power supply redundancy for the main MCU 72 , the upper arm isolated power supply circuit 90 and the lower arm isolated power supply circuit 91 .

That is, even when the abnormality (A) occurs, the intermediate power supply circuit 64, the first power supply circuit 66, and the main power supply circuit 65 operate using the backup power supply circuit 63 as a power supply source. Thereby, the main power supply voltage Vm of the main power supply circuit 65 and the first voltage Va of the first power supply circuit 66 are supplied to the main MCU 72 . Therefore, even when the abnormality (A) occurs, the operation of the main MCU 72 can be continued. As a result, the main MCU 72 can perform the three-phase short-circuit control in situations where the three-phase short-circuit control should be performed.

If a large-capacity backup power supply circuit 63 is used, the main MCU 72 may continue normal control when the abnormality (A) occurs. In the present embodiment, normal control is control for generating and outputting a switching command for controlling the control amount of the rotating electric machine 10 to a command value so as to make the vehicle run.

According to the above-described configuration in which the backup power supply circuit 63 is provided in addition to the low-voltage power supply 31, the three-phase short-circuit control can be quickly performed when an abnormality occurs.

In other words, even when the abnormality (A) occurs, since power is supplied from the backup power supply circuit 63 to the upper arm insulated power supply circuit 90, the upper arm driving section 92a constituting the upper arm driver 92 can operate. It's becoming Further, even when the abnormality (A) occurs, power is supplied from the backup power supply circuit 63 to the sub power supply circuit 67 . Therefore, the sub power supply voltage Vs can be supplied to the upper arm insulating transmission portion 92b constituting the upper arm driver 92, and the upper arm insulating transmission portion 92b can operate. Therefore, even when the abnormality (A) occurs, it is possible to perform drive control to quickly switch the upper arm switch SWH to the intended drive state.

Further, even when the abnormality (A) occurs, since power is supplied from the backup power supply circuit 63 to the lower arm insulated power supply circuit 91, the lower arm driving section 93a constituting the lower arm driver 93 can operate. It's becoming Further, even when the abnormality (A) occurs, power is supplied from the backup power supply circuit 63 to the main power supply circuit 65 . Therefore, the main power supply voltage Vm can be supplied to the lower arm insulating transmission portion 93b constituting the lower arm driver 93, and the lower arm insulating transmission portion 93b can operate. Therefore, even when the abnormality (A) occurs, it is possible to perform drive control to rapidly switch the lower arm switch SWL to the intended drive state.

In addition to the above-described configuration, the lower arm switches SWH and SWL can be rapidly switched to the intended driving state, so that the three-phase short-circuit control waits for the switch of one arm to be turned off by chance before switching to the off state. Compared to a configuration in which the switch of the other arm is turned on, short-circuit control can be quickly performed by an instruction from the low-voltage region side of the control circuit 50 .

In this embodiment, the output voltage VL of the input circuit 61 is set higher than the backup power supply voltage Vbps of the backup power supply circuit 63 . Due to this setting and the configuration in which the first and second diodes 62a and 62b are provided, when the abnormality (A) does not occur, the intermediate power supply circuit 64, the sub power supply circuit 67, the second power supply circuit 68, Power is supplied from the input circuit 61 to the upper arm insulated power supply circuit 90 and the lower arm insulated power supply circuit 91 . This eliminates the need to constantly output power from the backup power supply circuit 63, thereby reducing the power consumption of the backup power supply circuit 63. FIG. As a result, the size of the backup power supply circuit 63 can be reduced.

On the other hand, when the abnormality (A) occurs, the output voltage VL of the input circuit 61 is lowered, so that the backup power supply circuit 63, the intermediate power supply circuit 64, the sub power supply circuit 67, the second power supply circuit 68, and the upper arm isolated power supply circuit Power is supplied to 90 and lower arm insulated power supply circuit 91 .

When the abnormality (A) occurs, power is supplied from the backup power supply circuit 63 to the intermediate power supply circuit 64, the sub power supply circuit 67, the second power supply circuit 68, the upper arm insulated power supply circuit 90, and the lower arm insulated power supply circuit 91. Instead of setting "VL>Vbps" and providing the first and second diodes 62a and 62b, the configuration described below may be used. Specifically, when the abnormality (A) does not occur, the operation of the backup power supply circuit 63 is stopped, and when the abnormality (A) occurs, the backup power supply circuit 63 is operated to supply power from the backup power supply circuit 63. output.

The backup power supply circuit 63 generates power by being supplied with power from the high voltage power supply 30 . As a result, power can be supplied to the intermediate power supply circuit 64, the sub power supply circuit 67, the second power supply circuit 68, and the upper and lower arm insulated power supply circuits 90 and 91 when the abnormality (A) occurs without increasing the number of power sources. Three-phase short circuit control can be implemented.

The three-phase short-circuit control process and shutdown control process executed by the main MCU 72 will be described with reference to FIG. This process is also executed when an abnormality (B), which will be described later, occurs in addition to the abnormality (A). However, here, first, the case where the abnormality (A) occurs will be described.

In step S10, it is determined whether or not the abnormality (A) has occurred. Whether or not abnormality (A) has occurred can be determined, for example, based on the detection result of the low-voltage power supply voltage VB. The determination may be made based on whether or not VL has been switched to the backup power supply voltage Vbps. Note that the process of step S10 corresponds to the "abnormality determination unit".

If it is determined in step S10 that no abnormality has occurred, the process proceeds to step S11 to continue normal control.

On the other hand, if it is determined in step S10 that the abnormality (A) has occurred, the process proceeds to step S12 to perform lower arm ASC or upper arm ASC. The lower arm ASC is three-phase short-circuit control in which an OFF command is output to the upper arm switches SWH for three phases and an ON command is output to the lower arm switches SWL for three phases. The upper arm ASC is three-phase short-circuit control in which an ON command is output to the upper arm switches SWH for three phases and an OFF command is output to the lower arm switches SWL for three phases.

Specifically, in step S12, the lower arm ASC outputs an OFF command to the upper arm driver 92 via the first logic circuit 76 and the OR circuit 83, and outputs an OFF command to the lower arm driver 93 via the first logic circuit 76. This is processing for outputting an ON command. On the other hand, the upper arm ASC outputs an ON command to the upper arm driver 92 via the first logic circuit 76 and the OR circuit 83, and outputs an OFF command to the lower arm driver 93 via the first logic circuit 76. be. Note that the process of step S12 corresponds to the "abnormal time control section".

In step S13, the rotational speed Nr of the rotor detected by the speed detector 80 and the high-voltage power supply voltage Vdc detected by the voltage sensor 78 are obtained.

In step S14, the line voltage Vdemf when a back electromotive force is generated in the winding 11 is estimated using "Vdemfc=K×Nr" based on the obtained rotational speed Nr. K is a constant and is a value determined from the amount of magnetic flux φ of the magnetic poles of the rotor. Note that the line voltage Vdemf may be estimated, for example, based on the electrical angular velocity ωe calculated from the electrical angle θe instead of the rotational speed Nr of the rotor.

In step S15, it is determined whether the control to put the inverter 15 in a safe state is shutdown control or three-phase short-circuit control. This process is a process for determining whether or not regeneration is to be performed. Specifically, it is determined whether or not the estimated line voltage Vdemf exceeds the acquired high-voltage power supply voltage Vdc. By using the detected high-voltage power supply voltage Vdc as a value to be compared with the estimated line voltage Vdemf, the line voltage when a back electromotive force is generated in the winding 11 is equal to the terminal voltage of the smoothing capacitor 24. It can be accurately determined that the value is higher than

When a negative determination is made in step S15, it is determined that regeneration is not performed, and the process proceeds to step S13 while continuing the three-phase short-circuit control. On the other hand, if an affirmative determination is made in step S15, it is determined that regeneration is to be performed, the process proceeds to step S16, the three-phase short-circuit control is stopped, and shutdown control is performed according to a switching command.

The processing of step S14 described above is for preventing the winding 11, the switching device section 20, and the like from being overheated. That is, when the three-phase short-circuit control is performed, current circulates in the winding 11 and the switching device section 20, the amount of heat generated by the winding 11 and the switching device section 20 increases, and the winding 11 and the switching device section There is concern that an overheating abnormality such as 20 may occur. On the other hand, if the line voltage is equal to or lower than the terminal voltage of the smoothing capacitor 24 when a back electromotive voltage is generated in the winding 11, the current flowing from the winding 11 to the smoothing capacitor 24 side via the switching device section 20 will not regenerate. does not occur. Therefore, when the control to put the inverter 15 in a safe state is the shutdown control, it is switched to the shutdown control. This prevents overheating of the windings 11, the switching device section 20, and the like.

In addition, when there is a limit to the execution time of the three-phase short-circuit control due to thermal restrictions such as the winding 11 and the switching device unit 20, the operation of reducing the rotation speed of the rotor is performed by driving control of the rotating electric machine 10. . As a result, the line voltage Vdemf estimated based on the rotation speed Nr becomes equal to or lower than the high-voltage power supply voltage Vdc, and switching to shutdown control is performed.

In this way, by canceling the three-phase short-circuit control when execution of the three-phase short-circuit control becomes unnecessary, an increase in heat generation of the windings 11, the switching device section 20, etc. is prevented to protect the vehicle. It is possible to increase the evacuation travel distance of.

In step S17, it is determined whether or not the abnormality (A) determined in step S10 has been resolved. If it is determined that the abnormality (A) has been resolved, the process proceeds to step S10.

When the abnormality (A) occurs, the three-phase short-circuit control may be executed by the first logic circuit 76 instead of the main MCU 72 . Specifically, the first logic circuit 76 determines whether the abnormality (A) has occurred based on the detection result of the low-voltage power supply voltage VB.

When the first logic circuit 76 determines that none of the abnormalities has occurred, it outputs the switching command from the main MCU 72 to the OR circuit 83 and the lower arm driver 93 as it is. As a result, normal control is continued.

On the other hand, when the first logic circuit 76 determines that abnormality (A) has occurred, regardless of the switching command from the main MCU 72, it outputs an OFF command to the upper arm driver 92 via the OR circuit 83, A lower arm ASC that outputs an ON command to the arm driver 93 is performed. After that, when the first logic circuit 76 determines that the abnormality (A) has been resolved, it stops the lower arm ASC and outputs the switching command from the main MCU 72 to the OR circuit 83 and the lower arm driver 93 as it is.

(B) Backup power supply circuit 63
A low-voltage power supply 31 is provided in preparation for the occurrence of an abnormality in the backup power supply circuit 63 (hereinafter referred to as an abnormality (B)). This ensures power supply redundancy for the main MCU 72 , the upper arm isolated power supply circuit 90 and the lower arm isolated power supply circuit 91 . In addition, this enables the three-phase short-circuit control to be implemented quickly. As a result, the main MCU 72 can implement the three-phase short-circuit control in situations where the three-phase short-circuit control should be implemented.

The three-phase short-circuit control process and shutdown control process executed by the main MCU 72 will be described with reference to FIG.

In step S10, it is determined whether or not the abnormality (B) has occurred. Whether or not the abnormality (B) has occurred can be determined, for example, based on the detection result of the backup power supply voltage Vbps. If it is determined to be off, it may be determined that the abnormality (B) has occurred.

If it is determined in step S10 that the abnormality (B) has occurred, the process proceeds to step S12 to perform lower arm ASC or upper arm ASC. The subsequent processing is the same as in the case of (A).

(C) Sub power supply circuit 67
When an abnormality in the sub power supply circuit 67 (hereinafter referred to as an abnormality (C)) occurs, the sub MCU 73 to which the sub power supply circuit 67 supplies power, the second logic circuit 77, and the upper arm driver 92 operate on the low voltage region side. You will not be able to

In preparation for this case, in the present embodiment, the main power supply circuit 65, which is different from the sub power supply circuit 67, is used as the power supply source for the configuration of the main MCU 72, the first logic circuit 76, and the lower arm driver 93 on the low voltage region side. . Therefore, even if the abnormality (C) occurs, power can be supplied from the main power supply circuit 65 to the main MCU 72, the first logic circuit 76, and the lower arm driver 93 in the low voltage region. Three-phase short-circuit control can be carried out according to instructions.

Processing executed by the main MCU 72 will be described with reference to FIG.

In step S10, it is determined whether or not the abnormality (C) has occurred. Whether or not the abnormality (C) has occurred can be determined based on, for example, the detection result of the sub power supply voltage Vs. If it is determined that there is, it may be determined that the abnormality of (C) has occurred.

When it is determined in step S10 that the abnormality (C) has occurred, the process proceeds to step S12, and the lower arm ASC is performed by a switching command. The reason why the lower arm ASC is performed is that the sub power supply voltage Vs is not supplied to the configuration of the upper arm driver 92 on the low voltage region side, and the upper arm switch SWH cannot be turned on. The subsequent processing is the same as in the case of (A).

When the abnormality (C) occurs, the lower arm ASC may be performed by the first logic circuit 76 instead of the main MCU 72 .

(D) Main power supply circuit 65
If an abnormality (hereinafter referred to as (D)) occurs in the main power supply circuit 65, the components of the main MCU 72, the first logic circuit 76, and the lower arm driver 93 on the low voltage region side cannot be operated. In preparation for this case, in this embodiment, in addition to the main MCU 72 and the first logic circuit 76, a sub MCU 73 and a second logic circuit 77 are provided. A sub-power supply circuit 67 different from the main power supply circuit 65 is used as the power supply source of the configuration on the side. Therefore, even when the abnormality (D) occurs, power can be supplied from the sub power supply circuit 67 to the sub MCU 73, the second logic circuit 77, and the configuration of the upper arm driver 92 on the low voltage region side. Three-phase short-circuit control can be implemented by instructions from the circuit 77 .

Processing executed by the second logic circuit 77 and the sub MCU 73 will be described with reference to FIG.

In step S10, the second logic circuit 77 determines whether or not the abnormality (D) has occurred. Specifically, the second logic circuit 77 determines whether or not the abnormality (D) occurs based on the detection result of the main power supply voltage Vm of the main power supply circuit 65. More specifically, If it is determined that the main power supply voltage Vm is out of the range that can be taken as a normal value, it can be determined that the abnormality (D) has occurred.

When the second logic circuit 77 determines that the abnormality (D) has occurred, in step S12, it outputs an ON command to the OR circuit 83 and outputs a shutdown command to the first logic circuit 76. Perform upper arm ASC. When the first logic circuit 76 determines that the shutdown command is input, the switching command output to the OR circuit 83 and the lower arm driver 93 is turned off. The upper arm ASC is performed because the main power supply voltage Vm is not supplied to the configuration of the lower arm driver 93 on the low voltage region side, and the lower arm switch SWL cannot be turned on.

After that, in step S13, the sub-MCU 73 obtains the rotor rotational speed Nr and the high-voltage power supply voltage Vdc. In step S14, based on the acquired rotor rotational speed Nr and high-voltage power supply voltage Vdc, the sub MCU 73 determines whether the control to put the inverter 15 in a safe state is the shutdown control or the three-phase short circuit, as in (A). Determine if it is in control.

When the sub-MCU 73 determines that the control to establish the safe state is the shutdown state, it outputs an ASC cancellation command as a pulse signal to the second logic circuit 77 in step S16. As a result, the second logic circuit 77 sets the switching command to be output to the OR circuit 83 as an OFF command. As a result, shutdown control is performed.

In step S17, the second logic circuit 77 determines whether or not the abnormality (D) has been resolved.

When the abnormality (D) occurs, instead of the second logic circuit 77, the sub-MCU 73 may direct the upper arm ASC. In this case, the main power supply voltage Vm may also be input to the sub MCU 73 .

(E) Upper arm isolated power supply circuit 90
When an abnormality (hereinafter referred to as (E) abnormality) occurs in the upper arm insulated power supply circuit 90, the structure of the upper arm driver 92 on the high voltage region side cannot operate. In preparation for this case, in the present embodiment, a lower arm isolation power supply circuit 91 is provided to supply power to the high voltage region side configuration of the lower arm driver 93 so that the lower arm ASC can be performed from the first logic circuit 76. there is

Processing executed by the first logic circuit 76 and the main MCU 72 will be described with reference to FIG.

In step S10, the first logic circuit 76 determines whether the abnormality (E) has occurred based on the detection result of the upper arm drive voltage VdH. Specifically, when the first logic circuit 76 determines that the upper arm drive voltage VdH is out of the range that can be taken as its normal value, it may determine that the abnormality (E) has occurred.

When the first logic circuit 76 determines that the abnormality (E) has occurred, in step S12, the lower arm ASC that outputs an OFF command to the OR circuit 83 and outputs an ON command to the lower arm driver 93 is activated. implement. The reason why the lower arm ASC is performed is that the structure on the high voltage region side of the upper arm driver 92 cannot operate.

After that, in step S13, the main MCU 72 acquires the rotational speed Nr of the rotor and the high-voltage power supply voltage Vdc. In step S14, based on the acquired rotor rotational speed Nr and high-voltage power supply voltage Vdc, the main MCU 72 determines whether the control to bring the inverter 15 into a safe state is shutdown control or three-phase short circuit, as in (A). Determine if it is in control.

When the main MCU 72 determines that the control to establish the safe state is the shutdown state, it outputs an ASC cancellation command as a pulse signal to the first logic circuit 76 in step S16. As a result, the first logic circuit 76 turns off the switching command output to the lower arm driver 93 . As a result, shutdown control is performed.

In step S17, the first logic circuit 76 determines whether or not the abnormality (E) has been resolved.

When the abnormality (E) occurs, instead of the first logic circuit 76, the main MCU 72 may direct the lower arm ASC. In this case, the upper arm drive voltage VdH should be input to the main MCU 72 .

(F) Lower arm insulated power supply circuit 91
If the lower arm insulated power supply circuit 91 malfunctions (hereinafter referred to as (F)), the structure of the lower arm driver 93 on the high voltage region side cannot operate. In preparation for this case, in the present embodiment, an upper arm isolated power supply circuit 90 is provided to supply power to the configuration on the high voltage region side of the upper arm driver 92 so that the upper arm ASC can be performed from the first logic circuit 76. there is

Processing executed by the first logic circuit 76 and the main MCU 72 will be described with reference to FIG.

In step S10, the first logic circuit 76 determines whether the abnormality (F) has occurred based on the detection result of the lower arm drive voltage VdL. Specifically, when the first logic circuit 76 determines that the lower arm drive voltage VdL is out of the range that can be taken as its normal value, it may determine that the abnormality (F) has occurred.

When the first logic circuit 76 determines that the abnormality (F) has occurred, in step S12, the upper arm ASC that outputs an ON command to the OR circuit 83 and an OFF command to the lower arm driver 93 is activated. implement. The reason why the upper arm ASC is performed is that the configuration of the lower arm driver 93 on the high voltage region side cannot operate.

After that, in steps S13 to S16, the main MCU 72 performs the same processing as in (E). In step S17, the first logic circuit 76 determines whether or not the abnormality (F) has been resolved.

When the abnormality (F) occurs, instead of the first logic circuit 76, the main MCU 72 may direct the upper arm ASC. In this case, the lower arm drive voltage VdL may be input to the main MCU 72 .

(G) Main MCU 72, Main Monitoring Unit 81
When the main MCU 72 or the main monitoring unit 81 malfunctions (hereinafter referred to as (G) malfunction), the main MCU 72 cannot continue normal control. In the present embodiment, the upper arm ASC can be performed from the second logic circuit 77 in preparation for the case where the abnormality (G) occurs.

Processing executed by the second logic circuit 77 and the sub MCU 73 will be described with reference to FIG.

In step S10, when the second logic circuit 77 determines that the main abnormality signal Sgfm has been input from the main monitoring section 81, it determines that the abnormality (G) has occurred.

Then, in step S12, the second logic circuit 77 outputs an ON command to the OR circuit 83 and a shutdown command to the first logic circuit 76, thereby executing the upper arm ASC. The reason why the upper arm ASC is implemented is that the power supply source of the second logic circuit 77 and the power supply source of the configuration on the low voltage region side of the upper arm driver 92 are the same as the sub power supply voltage Vs.

After that, in steps S13 to S16, the sub MCU 73 performs the same process as in (D). Thus, even when the abnormality (G) occurs, it is possible to instruct cancellation of the three-phase short-circuit control. Incidentally, in the present embodiment, the processing of steps S13 to S16 corresponds to the "safety state judging section".

In step S17, the second logic circuit 77 determines whether or not the abnormality (G) has been resolved.

When the abnormality (G) occurs, instead of the second logic circuit 77, the sub-MCU 73 may direct the upper arm ASC. In this case, the main abnormality signal Sgfm should be input to the sub MCU 73 .

(H) Angle sensor 41, interface unit 70, resolver-to-digital converter 71, phase current sensor 40, first CAN transceiver 74
If at least one of the angle sensor 41, the interface unit 70, and the resolver-to-digital converter 71 has an angle detection abnormality, the main MCU 72 cannot use the electrical angle θe, so normal control cannot be performed. Further, when an abnormality occurs in the phase current sensor 40, the current signal Iph cannot be used, so normal control cannot be performed. Further, when an abnormality occurs in the first CAN transceiver 74, it becomes impossible to acquire the command value of the control amount, so that normal control cannot be performed. Hereinafter, such an anomaly is referred to as an anomaly of (H).

When the main MCU 72 determines that the abnormality (H) has occurred, the main MCU 72 performs upper arm ASC or lower arm ASC according to a switching command. Here, the three-phase short-circuit control and shutdown control executed by the main MCU 72 when the abnormality (H) occurs may be executed in the same manner as (A). Further, whether or not an angle detection abnormality has occurred can be determined, for example, based on the input electrical angle θe. The determination may be made based on Iph. Further, whether or not the first CAN transceiver 74 has become abnormal may be determined based on the input signal from the first CAN transceiver 74, for example.

(I) Upper and lower arm drivers 92, 93, upper and lower arm switches SWH, SWL
An abnormality in the upper/lower arm drivers 92, 93 or an abnormality in the upper/lower arm switches SWH, SWL will be referred to as an abnormality (I). The three-phase short-circuit control process and shutdown control process executed by the main MCU 72 will be described with reference to FIG.

In step S10, it is determined whether or not abnormality (I) has occurred based on the upper arm failure signal SgfH and the lower arm failure signal SgfL.

When it is determined that the abnormality (I) has occurred, in step S12, three-phase short-circuit control is performed according to a switching command.

Specifically, it specifies which phase and which arm of the upper and lower arm switches SWH and SWL has an abnormality, and whether the abnormality is an open abnormality or a short circuit. Identify.

Then, when it is determined that at least one switch on the upper arm has a short-circuit abnormality, or when it is determined that at least one switch on the lower arm has an open abnormality, upper arm ASC is performed. On the other hand, when it is determined that at least one switch on the lower arm has a short-circuit abnormality, or when it is determined that at least one switch on the upper arm has an open abnormality, the lower arm ASC is performed.

The subsequent processes of steps S13 to S16 are the same as in (A). However, it is possible to switch to shutdown control when an affirmative determination is made in step S15 only when an open-circuit abnormality occurs in the switch, and cannot switch when a short-circuit abnormality occurs.

(J) Sub-MCU 73, sub-monitoring unit 82, speed detector 80
If the sub-MCU 73 or the sub-monitoring unit 82 malfunctions, the sub-MCU 73 cannot release the three-phase short-circuit control. Further, when an abnormality occurs in the speed detector 80, it becomes impossible to calculate the line voltage Vdemf, and it becomes impossible to determine whether the control for making the inverter 15 in a safe state is shutdown control or three-phase short-circuit control. Hereinafter, such an anomaly will be referred to as an anomaly (J).

The three-phase short-circuit control process and shutdown control process executed by the main MCU 72 will be described with reference to FIG.

In step S10, it is determined whether or not the abnormality (J) has occurred. For example, based on the sub-abnormality signal Sgfs of the sub-monitoring section 82 or the detection result of the speed detector 80, it may be determined whether or not the abnormality (J) has occurred.

When it is determined that the abnormality (J) has occurred, in step S12, three-phase short-circuit control is performed by a switching command. The subsequent processes of steps S13 to S16 are the same as in (A).

(K) First and second cut-off switches 23a, 23b
When at least one of the first and second cutoff switches 23a and 23b has an open abnormality (hereinafter referred to as (K) abnormality), the terminal voltage of the smoothing capacitor 24 rises significantly. 76 receives the overvoltage signal Sovh. In this case, the first logic circuit 76 implements three-phase short circuit control. Switching from three-phase short-circuit control to shutdown control may be performed in the same manner as in (A).

One of the reasons why the three-phase short-circuit control can be performed quickly in this embodiment is to cope with the occurrence of the abnormality (K). That is, at least one of the first and second cutoff switches 23a and 23b may be open abnormally. In this case, if regeneration is performed, the terminal voltage of the smoothing capacitor 24 will greatly increase and exceed its allowable upper limit, and the smoothing capacitor 24 may fail. Therefore, in order to suppress the rise in the terminal voltage of the smoothing capacitor 24 as early as possible, a configuration is adopted in which drive control is possible to rapidly switch the upper and lower arm switches SWH and SWL to the intended drive state. As a result, the time from when the overvoltage signal Sovh is output from the overvoltage detection unit 79 to the main MCU 72 until the three-phase short-circuit control is performed by the switching command of the first logic circuit 76 is shortened, and the three-phase short-circuit control is quickly performed. We are making it possible to implement it.

Incidentally, in addition to the explanations in (A) to (K), the main MCU 72 may perform three-phase short-circuit control when it determines that the second CAN transceiver 75 has become abnormal.

<Second embodiment>
The second embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, the main MCU 72, when continuing normal control when it is determined that an abnormality (A) has occurred, sets the upper and lower arm switches SWH, Lower the switching frequency fsw of SWL.

FIG. 5 shows the procedure of processing executed by the main MCU 72 . In addition, in FIG. 5, the same reference numerals are assigned to the processes shown in FIG. 4 for the sake of convenience.

In step S20, it is determined whether or not the abnormality (A) has occurred. When an affirmative determination is made in step S20, the process proceeds to step S21 to reduce the switching frequency fsw. As a result, the power consumption of the upper arm insulated power supply circuit 90 and the lower arm insulated power supply circuit 91 can be reduced, and in turn the power consumption of the backup power supply circuit 63 can be reduced. As a result, the size of the backup power supply circuit 63 can be reduced while the vehicle continues to run under normal control.

<Other embodiments>
It should be noted that each of the above-described embodiments may be modified as follows.

4 and 5, the line voltage Vdemf is estimated by further using the detected value of the temperature sensor that detects the temperature of the rotor of the rotary electric machine 10 or the estimated value of the temperature estimator that estimates the temperature of the rotor. may be

If the control system is equipped with a sensor that detects the line voltage, the line voltage that is compared with the high-voltage power supply voltage Vdc in step S15 may be the detected value of the line voltage instead of the estimated value.

The value to be compared with the line voltage Vdemf in step S15 is not limited to the detected high-voltage power supply voltage Vdc, and may be, for example, a predetermined determination voltage. The determination voltage may be set to, for example, the minimum value within the range of normal values of the terminal voltage of the high-voltage power supply 30 .

- In addition to the lower arm drive voltage VdL, the discharge processing unit 101 may be supplied with power from a power supply circuit using the high-voltage power supply 30 or the low-voltage power supply 31 as a power supply source. Thereby, the power supply source of the discharge processing unit 101 can be made redundant.

- The control circuit 50 does not have to include the insulation transmission unit 100 and the discharge processing unit 101 for performing discharge control of the smoothing capacitor 24 .

The configuration of the upper arm driver 92 on the low voltage region side may be supplied with the low voltage power supply voltage VB instead of the sub power supply voltage Vs. In this case, even if an abnormality occurs in the sub power supply circuit 67, the configuration of the upper arm driver 92 on the low voltage region side can operate, so the main MCU 72 can continue to run the vehicle.

- Like the main MCU 72, the sub MCU 73 may have a function of generating a switching command for normal control.

- The rotation speed Nr detected by the speed detector 80 may be input to the main MCU 72 and the sub MCU 73 via the CAN transceiver and CAN bus.

- The backup power supply circuit 63 may generate power by being supplied with power from a power supply other than the high voltage power supply 30 and the low voltage power supply 31 . Even in this case, for example, when the abnormality (A) occurs, power can be supplied to the intermediate power supply circuit 64, the sub power supply circuit 67, the second power supply circuit 68, and the upper and lower arm insulated power supply circuits 90 and 91. Short circuit control can be implemented.

- As the drivers 92 and 93, drivers provided only in the high pressure region without straddling the boundary between the low pressure region and the high pressure region may be used.

- In the configuration shown in FIG. 1, a boost converter may be provided between the smoothing capacitor 24 and the cutoff switches 23a and 23b.

- The switch that constitutes the switching device section is not limited to an IGBT, and may be an N-channel MOSFET that incorporates a body diode, for example.

- Two or more switches connected in parallel may be used as the switches for each phase and each arm constituting the switching device section. In this case, the combination of switches connected in parallel may be, for example, a combination of a SiC switching element and a Si switching element, or a combination of an IGBT and a MOSFET.

- The control amount of the rotating electrical machine is not limited to the torque, and may be, for example, the rotation speed of the rotor of the rotating electrical machine.

・The rotary electric machine is not limited to a three-phase one. Further, the rotating electric machine is not limited to the permanent magnet synchronous machine, and may be, for example, a winding field synchronous machine. Further, the rotating electric machine is not limited to a synchronous machine, and may be an induction machine, for example. Further, the rotary electric machine is not limited to one used as a vehicle-mounted main engine, and may be one used for other purposes such as an electric power steering device or an electric motor constituting an electric compressor for air conditioning.

- The controller and techniques described in this disclosure can be performed by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program; may be implemented. Alternatively, the controls and techniques described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the control units and techniques described in this disclosure can be implemented by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. It may also be implemented by one or more dedicated computers configured. The computer program may also be stored as computer-executable instructions on a computer-readable non-transitional tangible recording medium.

DESCRIPTION OF SYMBOLS 10... Rotary electric machine, 15... Inverter, 24... Smoothing capacitor, 50... Control circuit.

Claims (9)

a first power source (30);
a multiphase rotating electric machine (10);
and a power converter (15) electrically connected to each phase winding (11) of the rotating electric machine and the first power supply and having upper and lower arm switches (SWH, SWL). In a power converter control circuit (50),
The system includes a second power supply (31) and a third power supply (63) that serve as power supply sources for the control circuit,
an abnormality determination unit that determines whether an abnormality has occurred in the system;
When the abnormality determination unit determines that an abnormality has occurred, the switch in either one of the upper and lower arms uses power generated by at least one of the second power supply and the third power supply. an abnormal time control unit that performs short-circuit control that drives and controls the on-side switch to the on state and drives and controls the off-side switch, which is the switch on the other arm, to the off state ;
an upper arm drive power supply (90) that uses the second power supply and the third power supply as power supply sources and serves as a drive power supply for the switch of the upper arm;
A control circuit for a power converter , comprising: a lower arm drive power supply (91) that uses the second power supply and the third power supply as power supply sources, and serves as a drive power supply for the switch of the lower arm . When there is no abnormality in the system, power is supplied from the second power supply of the second power supply and the third power supply, and when an abnormality occurs in the system, the second power supply and the third power supply are supplied. 2. A control circuit for a power converter according to claim 1 , wherein power is supplied from said third power supply. When it is determined that an abnormality in which power cannot be supplied from the second power supply to the control circuit has occurred as an abnormality in the system, when continuing to control the control amount of the rotating electric machine, the control amount is higher than when the abnormality does not occur. 3. The power converter control circuit according to claim 2 , wherein the switching frequency of the switch is lowered. A first state control unit (72, 76) and a second state control unit (73, 77) as the abnormal time control unit,
The power converter control circuit according to any one of claims 1 to 3 , wherein the second power supply and the third power supply are power supply sources for the first state control section and the second state control section. . a first power source (30);
a multiphase rotating electric machine (10);
and a power converter (15) electrically connected to each phase winding (11) of the rotating electric machine and the first power supply and having upper and lower arm switches (SWH, SWL). In a power converter control circuit (50),
The system includes a second power supply (31) and a third power supply (63) that serve as power supply sources for the control circuit,
an abnormality determination unit that determines whether an abnormality has occurred in the system;
When the abnormality determination unit determines that an abnormality has occurred, the switch in either one of the upper and lower arms uses power generated by at least one of the second power supply and the third power supply. an abnormal time control unit that performs short-circuit control that drives and controls the on-side switch to the on state and drives and controls the off-side switch, which is the switch on the other arm, to the off state ;
A first state control unit (72, 76) and a second state control unit (73, 77) as the abnormal time control unit,
The second power supply and the third power supply are power supply sources for the first state control unit and the second state control unit,
a first power generator (65) that generates power using the second power supply and the third power supply as power supply sources;
A second power generation unit (67) that generates power using the second power supply and the third power supply as power supply sources,
The first state control unit is configured to be operable by being supplied with power generated by the first power generation unit,
A control circuit for a power converter, wherein the second state control section is configured to be operable by being supplied with power generated by the second power generation section . a first power source (30);
a multiphase rotating electric machine (10);
and a power converter (15) electrically connected to each phase winding (11) of the rotating electric machine and the first power supply and having upper and lower arm switches (SWH, SWL). In a power converter control circuit (50),
The system includes a second power supply (31) and a third power supply (63) that serve as power supply sources for the control circuit,
an abnormality determination unit that determines whether an abnormality has occurred in the system;
When the abnormality determination unit determines that an abnormality has occurred, the switch in either one of the upper and lower arms uses power generated by at least one of the second power supply and the third power supply. an abnormal time control unit that performs short-circuit control that drives and controls the on-side switch to the on state and drives and controls the off-side switch, which is the switch on the other arm, to the off state ;
When the abnormality determination unit determines that an abnormality has occurred, the abnormality time control unit is configured such that the control for putting the power converter into a safe state is shutdown control or the short-circuit control to turn off the switches of the upper and lower arms. If it is determined that the short-circuit control is the control that can put the power converter in a safe state, the short-circuit control is performed, and then the control that can put the power converter in a safe state is the above A control circuit for a power converter that stops execution of the short-circuit control and performs the shutdown control when it is determined that the shutdown control is to be performed . a switch command generator (72) for generating and outputting a switching command for controlling the power converter;
switch drive units (92a, 93a) that drive and control the switches of the upper and lower arms based on the switching command;
a safe state determination unit (73) that determines, when it is determined that an abnormality has occurred in the switch command generation unit, whether the control that can bring the power converter to a safe state is the shutdown control or the short-circuit control; with
The safe state determination unit, when determining that the shutdown control is the control that can put the power converter in a safe state during execution of the short-circuit control, stops execution of the short-circuit control and performs the shutdown control. Item 7. A power converter control circuit according to item 6 . 8. The electric power according to claim 7 , wherein whether the control that enables the power converter to be in a safe state is the shutdown control or the short-circuit control is determined based on back electromotive force information generated in the winding. Converter control circuit. a first power source (30);
a multiphase rotating electric machine (10);
and a power converter (15) electrically connected to each phase winding (11) of the rotating electric machine and the first power supply and having upper and lower arm switches (SWH, SWL). In a power converter control circuit (50),
The system includes a second power supply (31) and a third power supply (63) that serve as power supply sources for the control circuit,
an abnormality determination unit that determines whether an abnormality has occurred in the system;
When the abnormality determination unit determines that an abnormality has occurred, the switch in either one of the upper and lower arms uses power generated by at least one of the second power supply and the third power supply. an abnormal time control unit that performs short-circuit control that drives and controls the on-side switch to the on state and drives and controls the off-side switch, which is the switch on the other arm, to the off state ;
The third power supply is a control circuit for a power converter that generates power when power is supplied from the first power supply .

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