JP6291899B2 - Rotating electrical machine control device - Google Patents

Description

  The present invention relates to a rotating electrical machine control device that drives and controls an AC rotating electrical machine.

  In an electric vehicle or a hybrid vehicle that does not receive power supply from an overhead line, power is generally supplied from a high-voltage battery having a direct current of 200 to 400 [V], for example, to an electric rotating machine as a driving force source via an inverter. The rotating electrical machine also has a function as a generator that generates electric power using kinetic energy of a vehicle or an internal combustion engine, and the generated electric power is regenerated to a battery via an inverter. For such an inverter, a semiconductor switching element called a power device having a large withstand power is used. On the other hand, each switching element constituting the inverter is generally subjected to switching control by a control device that operates by being supplied with electric power from a low voltage battery of about 12 to 24 [V].

  By the way, when a vehicle collides or when a collision is predicted, the electrical connection between the inverter and the high voltage battery may be disconnected in order to stop the vehicle at an early stage. At this time, it is necessary to quickly consume or discharge the electric power accumulated in the smoothing capacitor provided in the inverter and the electric power generated by the rotating electric machine rotating by the inertial force. As an example, the switching element on the upper stage of the inverter (for example, the upper switching element (positive switching element) of two switching elements that are connected in series between the positive electrode and the negative electrode in a complementary manner) is controlled to be in an OFF state. Then, active short control is performed to control the switching element on the lower stage side (negative electrode side) to the on state.

  However, when the vehicle collides, the circuit in the vehicle may be disconnected due to the impact of the collision. For example, if a break occurs in the wiring between the low voltage battery and the control device, the control device loses power and cannot perform active short control on the inverter. Therefore, for example, Japanese Patent Application Publication No. 2005-525777 (Patent Document 1) proposes that the power switch (the lower-stage (negative-side) switching element) connected to the low-side arm of the inverter is configured with a normally-on switching element. (Patent Document 1: Abstract, 4th, 7th, 11th paragraphs, FIG. 1 and the like). The normally-on switching element is turned on and becomes conductive when a control signal for the element (power switch) is in an inactive state. Accordingly, when the control device loses power and stops its operation, and the control signal becomes inactive, it is turned on, and active short control is automatically executed. As the upper-side switching element, a normal type element (not a normally-on switching element) is used.

  However, normally-on switching elements are not general-purpose and have a high component unit price. In addition, for example, two switching elements that are connected in series between the positive electrode and the negative electrode and perform complementary switching have different electrical characteristics, and it becomes difficult to obtain uniform switching characteristics. On the other hand, in order to achieve the same effect using a normal type normally-off switching element (an element that is turned on when the control signal is in an active state), the normally-on switching element is connected in parallel with the switching element of the low-side arm. A device for connecting the relay is required, which is not preferable in terms of cost and circuit scale. In addition, there is a method of adding an active short control circuit that is activated upon detection of power loss of the control device, but it is also not preferable from the viewpoint of cost and circuit scale.

JP 2005-525777 A

  In view of the above background, there is a demand for a technique for smoothly controlling an inverter even when the power supply of the control circuit of the inverter is lost while suppressing an increase in the device scale.

In view of the above problems, the characteristic configuration of the rotating electrical machine control device according to the present invention is:
A rotating electrical machine control device for driving and controlling an AC rotating electrical machine,
An inverter that is interposed between the high-voltage DC power supply and the rotating electrical machine and performs power conversion between DC and AC;
An inverter control device that is a power source having a voltage lower than that of the high-voltage DC power source, operates with power supplied from a low-voltage DC power source that is insulated from the high-voltage DC power source, and controls switching of the switching elements of the inverter;
The high-voltage DC power supply is configured as a power source, and a backup power supply capable of supplying power to the inverter control device;
In a low-voltage power supply lowered state in which the power supplied from the low-voltage DC power source to the inverter control device is equal to or lower than a predetermined reference value, a power supply path is provided so as to supply power from the backup power source to the inverter control device. A power switch for switching ,
The arm for one phase of AC constituting the inverter is constituted by a series circuit of an upper stage side switching element and a lower stage side switching element that are complementarily switched and controlled.
A control signal drive circuit that relays a switching control signal that is generated by the inverter control device and controls each switching element;
A drive circuit power supply for supplying power to each of the control signal drive circuits,
Among the drive circuit power supplies, the upper drive circuit power supply that supplies power to the control signal drive circuit that relays the switching control signal to the upper switch element is configured with the low-voltage DC power supply as a power source, The power source for the lower stage drive circuit that supplies power to the control signal drive circuit that relays the switching control signal to the lower stage side switching element is configured by using the high-voltage DC power source as a power source .

  According to this configuration, when the power supply from the low-voltage DC power supply to the inverter control device is reduced and the low-voltage power supply is lowered, the power supply path to the inverter control device is switched, and the backup power supply to the inverter control device is switched. Electric power is supplied. The backup power supply is configured with a high-voltage DC power supply, which is a separate power supply from the low-voltage DC power supply, as the power source. For example, when there is an abnormality in the wiring around the low-voltage DC power supply or the low-voltage DC power supply Even if it exists, electric power can be supplied to an inverter control apparatus, without depending on these states. If an abnormality occurs in the low-voltage DC power supply or the vicinity thereof, the inverter cannot be controlled by the inverter control device, which may cause overvoltage or the like. For this reason, a fail-safe circuit for performing fail-safe control such as shutdown control for stopping the inverter and active short control for consuming surplus power may be provided instead of the inverter control device. However, according to this configuration, it is possible to execute shutdown control and active short control using the inverter control device without depending on such a fail-safe circuit. That is, according to this configuration, it is possible to smoothly control the inverter even when the power source of the control circuit of the inverter is lost while suppressing an increase in the device scale.

As described above, in the rotating electrical machine control device according to the present invention, the AC one-phase arm constituting the inverter is configured by a series circuit of an upper-stage switching element and a lower-stage switching element that are complementarily switched and controlled. is intended to be, that is organized as follows. That is, the rotary electric machine control device is generated by pre-Symbol inverter control device, and a control signal driving circuit that relays a switching control signal for controlling each switching element, the drive circuit for supplying power to each of the control signal driving circuit with a use power, and of the power supply for the drive circuit, the power source for the upper stage driver circuit for supplying electric power to said control signal driving circuit for relaying the switching control signal to the upper-stage switching element, the low-pressure DC power supply It is configured as a power source, the lower-side power supply for the lower-side drive circuit for supplying electric power to said control signal driving circuit for relaying the switching control signal to the switching element, that has the high-voltage DC power source is configured as a power source .

As described above, in the low-voltage power supply lowered state, the power supply path is switched so as to supply power from the backup power supply to the inverter control device, so that the inverter control device can control the inverter. However, if the power supply to the power supply for the drive circuit that supplies power to each of the control signal drive circuits that relay the switching control signal stagnate, the inverter can be switched and controlled even if a signal is output from the inverter control device. It will disappear. Shutdown control and active short-circuit control can be performed using either the upper stage switching element or the lower stage switching element of the inverter. Therefore, if either the upper-stage drive circuit power supply or the lower-stage drive circuit power supply is configured to function even in a low-voltage power supply lowered state, failsafe control by the inverter control device can be applied to the inverter. Can do. As a power source high-voltage DC power source is a power source to the backup power supply for supplying power to the inverter control circuit, when power for the lower-stage side drive circuit is configured, when the power supply of the control circuit of the inverter is lost In addition, the inverter can be controlled smoothly.

When performing active short control as fail-safe control, the upper switching element of an inverter is often controlled to be in an off state and the lower switching element is often controlled to be in an on state. In general, the switching element used in the inverter is an element that is turned off when the control terminal is in an inactive state. Therefore, the upper-side switching element is not controlled during active short-circuit control. May be off. Therefore, it is sufficient that at least the power supply for the lower drive circuit functions in the low-voltage power supply lowered state. Therefore, as described above, it is preferable that the upper drive circuit power supply is configured with the low-voltage DC power supply as a power source, and the lower drive circuit power supply is configured with the high-voltage DC power supply as a power source. It is.

  The rotating electrical machine control device according to the present invention is preferably provided with a capacitor for stabilizing a power supply voltage of the inverter control device between the power supply changeover switch and the inverter control device. A method of increasing the capacitance of the voltage stabilizing capacitor provided in the power supply line to the inverter control device in order to maintain the power supply to the inverter control device even if a low voltage power supply is lowered. There is. However, increasing the capacitance increases the size and cost of the capacitor. As described above, when a backup power supply is provided and the power supply path is switched by the power switch when the low-voltage power supply is in a lowered state, a short-time voltage drop (instantaneous) caused by this switching, noise, voltage fluctuation, etc. The capacitance of the capacitor can be suppressed to the extent that it can cope with the That is, the size of the capacitor can be reduced and the cost can be reduced.

Block diagram schematically showing a configuration example of a rotating electrical machine control device The figure which shows typically the structural example of a backup power supply and a lower stage side gate drive power supply The figure which shows typically the structural example of an upper stage side gate drive power supply

  Hereinafter, an embodiment of the present invention will be described by taking a motor control device (rotary electric machine control device) for driving and controlling a power motor (rotary electric machine) of an electric vehicle or a hybrid vehicle as an example. First, the configuration of the motor control device will be described with reference to FIG. The motor 90 (rotary electric machine) is a three-phase AC motor and also functions as a generator.

  The motor control device includes an inverter 1 that uses a power switching element (power switching element) such as an insulated gate bipolar transistor (IGBT) or a power MOSFET (metal oxide semiconductor field effect transistor) to convert direct current into three-phase alternating current. Has been. Of course, the inverter 1 can also be configured using power switching elements having various structures such as a bipolar type. In the present embodiment, the inverter 1 is interposed between the motor 90, which is a three-phase AC motor, and the high-voltage battery 2H, and performs power conversion between DC and AC. Therefore, the inverter 1 performs power conversion between direct current and three-phase alternating current. The arm for one AC phase constituting the inverter 1 is constituted by a series circuit of an upper stage side switching element and a lower stage side switching element that are complementarily switched. As shown in FIG. 1, the inverter 1 is configured to include this series circuit for three phases. In the present embodiment, the inverter 1 includes six switching elements 10. In addition, although illustration is abbreviate | omitted, each switching element 10 is provided with the freewheel diode in parallel.

  A DC voltage is applied to the switching element 10 from a high-voltage battery 2H serving as a high-voltage DC power source, and the switching element 10 is converted into a three-phase AC of U phase, V phase, and W phase. When the motor 90 is an automobile power motor, a DC voltage of several hundred volts is input to the switching element 10, and a three-phase motor drive current is output from the switching element 10. These motor drive currents are supplied to the U-phase, V-phase, and W-phase stator coils of the motor 90.

  The motor control device includes a control circuit 30 (inverter control device) that operates at a voltage much lower than the power supply voltage of the inverter 1 (positive electrode P-negative electrode N; 200 to 400 [V]). The control circuit 30 receives power from a low-voltage battery 2L (positive electrode B-ground; 12 to 24 [V]) as a low-voltage DC power supply via a power supply circuit (control circuit drive power supply 6) configured by a regulator circuit or the like. Supplied. The control circuit 30 includes a microcomputer, a DSP (digital signal processor), and the like as core components. The operating voltage of a microcomputer or DSP is generally 3.3 [V] or 5 [V]. Accordingly, the control circuit drive power supply 6 generates an operating voltage of 3.3 [V] or 5 [V] from a power supply voltage of, for example, around 12 [V] supplied from the low voltage battery 2L.

  The control circuit 30 controls the motor 90 in accordance with a command acquired by communication such as a CAN (controller area network) from an unillustrated ECU (electronic control unit) that controls the operation of the vehicle. In addition, the control circuit 30 receives detection signals from the current sensor 91 and the rotation sensor 92 that detect the behavior of the motor 90 and executes feedback control according to the operating state of the motor 90. The control circuit 30 generates a drive signal (switching control signal) that drives the switching element 10 of the inverter 1 in order to control the motor 90. When the switching element 10 is an IGBT or FET, these control terminals are gate terminals. In this embodiment, a drive signal input to the control terminal is referred to as a gate drive signal (switching control signal).

  As described above, the inverter 1 is a high voltage circuit that is connected to the high voltage battery 2H and operates at a high voltage. On the other hand, the control circuit 30 is a low voltage circuit that operates at a low voltage. The high voltage circuit and the low voltage circuit are spaced apart from each other by a predetermined insulation distance, and the gate drive signal is transmitted from the control circuit 30 to the inverter 1 via the insulation component IS. The insulating component IS is, for example, a photocoupler. The photocoupler is a known insulating component that includes a light emitting diode on the input side and a photodiode or a phototransistor on the output side, and wirelessly transmits light from the input side to the output side. Note that it is also preferable to use a small transformer for signal transmission as the insulating component IS.

  In addition, a drive signal (gate) generally having an amplitude of about 12 to 18 [V] is applied to the control terminal (for example, gate terminal) of the power switching element constituting the inverter 1 belonging to the high voltage circuit as in the present embodiment. Drive signal). On the other hand, as described above, since the operating voltage of the control circuit 30 that generates the gate drive signal is less than 12 [V], the gate drive signal having a necessary amplitude cannot be provided to the inverter 1. Therefore, the gate drive circuit 20 (control signal drive) that relays the drive performance of the gate drive signal (switching control signal) for each switching element 10 (for example, the ability to operate the subsequent circuit such as voltage amplitude and output current) is increased. Circuit).

  For example, the gate drive signal generated in the control circuit 30 belonging to the low voltage circuit is connected to the input terminal of the photocoupler that is the insulating component IS. The output terminal of the photocoupler is connected to the driver IC of the gate drive circuit 20 belonging to the high voltage circuit. A gate drive signal is transmitted from the control circuit 30 to the gate drive circuit 20 while the insulation between the low voltage circuit and the high voltage circuit is maintained by the photocoupler. Then, the drive capability of the gate drive signal is enhanced by the driver IC of the gate drive circuit 20, and the switching element 10 of the inverter 1 belonging to the high voltage circuit 50 is driven and controlled.

  The motor control device includes drive circuit power supplies (4, 5) for supplying power to the gate drive circuits 20, respectively. The drive circuit power supply (4, 5) is composed of a transformer, which is an insulating component, similar to the photocoupler (see FIG. 2, FIG. 3, etc.). The transformer is a known insulating component that transmits signals and energy by electromagnetic coupling between the primary coil and the secondary coil. Therefore, regardless of whether the power source of the drive circuit power supply (4, 5) is the high voltage battery 2H or the low voltage battery 2L, the insulation between the low voltage circuit and the high voltage circuit is maintained, and the gate drive circuit 20 is supplied. Electric power can be supplied. In the present embodiment, as the drive circuit power supply (4, 5), the upper stage gate drive power supply 4 (upper stage drive circuit power supply) that supplies power to the gate drive circuit 20 that relays the gate drive signal to the upper stage switching element. In addition, an example in which a lower-stage gate drive power supply 5 (lower-stage drive circuit power supply) that supplies power to the gate drive circuit 20 that relays the gate drive signal to the lower-stage switching element is illustrated.

  In the present embodiment, a backup power supply 3 that is configured using the high-voltage battery 2H as a power source and capable of supplying power to the control circuit 30 is further provided. For example, when a vehicle collides, the circuit in the vehicle may be disconnected due to the impact of the collision. At this time, if disconnection occurs in the wiring between the low voltage battery 2L and the control circuit 30, the control circuit 30 cannot control the inverter 1. In a hybrid vehicle or an electric vehicle, when the vehicle collides or when a collision is predicted, the electrical connection between the inverter 1 and the high-voltage battery 2H may be disconnected in order to stop the vehicle at an early stage. At this time, as shown in FIG. 1, it is necessary to quickly consume or discharge the electric power accumulated in the smoothing capacitor 11 provided in the inverter 1 and the electric power generated by the motor 90 rotated by the inertial force. For this reason, active short control may be executed in which the upper switching element of the inverter 1 is controlled to be in the off state and the lower switching element is controlled to be in the on state. However, when the power supply to the control circuit 30 is stagnant, such active short control cannot be performed.

  In this embodiment, the backup power supply 3 is provided so that the power supply to the control circuit 30 can be maintained even in such a case. Furthermore, a power supply changeover switch 7 that switches the power supply path so as to supply power from the backup power supply 3 to the control circuit 30 is also provided. The power supply selector switch 7 sets a power supply path so that power is supplied from the control circuit drive power supply 6 to the control circuit 30 at normal times. On the other hand, when the power supplied from the low voltage battery 2L to the control circuit 30 is lower than a predetermined reference value, the power supply path is switched and power is supplied from the backup power source 3 to the control circuit 30. Set the power supply path. The switching control circuit 71 determines whether or not the low-voltage power supply is reduced. Accordingly, it can be said that the switch control circuit 71 also functions as the power switch 7.

  The reference value for determining whether or not the low-voltage power supply is in a lowered state is set to about 3 to 8 [V] according to the electrical characteristics of the regulator circuit that constitutes the control circuit drive power supply 6, for example. It is preferable that Moreover, it is preferable that the target part for determining whether or not the low-voltage power supply is lowered is, as one aspect, the voltage between terminals of the low-voltage battery 2L or the voltage between input terminals of the control circuit drive power supply 6. . That is, when the control circuit drive power supply 6 cannot output the power necessary for the operation of the control circuit 30, it is determined that the low-voltage power supply has been lowered, and the control circuit 30 is interrupted when the power supply path is switched. The operation can be continued without any problems.

  As described above, when the backup power supply 3 is provided and the power supply path is switched in the low-voltage power supply lowered state, the control circuit drive power supply 6 and the control circuit 30 are connected (the output side of the power supply switch 7 and the output side). The capacitance of the capacitor 66 provided between the control circuit 30 and the power supply voltage of the control circuit 30 can be suppressed. When the backup power source 3 is not provided, a capacitor 66 having a relatively large capacity is provided in order to prevent the power source voltage of the control circuit 30 from being lowered when the voltage of the power source to the control circuit 30 is lowered. Is preferred. However, when the backup power supply 3 is provided, it is sufficient to be prepared for a short time power loss (so-called instantaneous interruption) that occurs when the power supply path is switched. Accordingly, the capacitance of the capacitor 66 can be suppressed, and the capacitor 66 can be reduced in size and price.

  By the way, as described above, in the active short control, the lower stage switching element is controlled to be in the ON state. Therefore, the gate drive signal of the lower switching element generated by the control circuit 30 needs to be properly relayed through the gate drive circuit 20. For this reason, the lower stage gate drive power supply 5 that supplies power to the gate drive circuit 20 that relays the gate drive signal to the lower stage switching element also needs to operate properly in the low-voltage power supply lowered state. Therefore, in the present embodiment, like the backup power supply 3, the lower gate drive power supply 5 is configured with the high voltage battery 2H as a power source.

  The upper gate drive power supply 4 may be in a non-operating state during active short control. In general, the switching elements constituting the inverter 1 are elements that are turned off when a control signal such as a gate drive signal is not active (normally off switching elements), and therefore the corresponding gate drive circuit 20 does not operate. It's okay. Therefore, in the present embodiment, the upper gate drive power supply 4 is configured with the low voltage battery 2L as a power source. If a drive circuit power source (4, 5) of about 20 [V] is generated from the high voltage battery 2H having a very high voltage of 200 to 400 [V], the loss increases. Since it is more efficient to generate the drive circuit power supply (4, 5) from the low voltage battery 2L of about 12 to 24 [V], in this embodiment, the upper gate drive power supply 4 uses the low voltage battery 2L as power. The form comprised as a source is illustrated.

  As described above, in the present embodiment, the backup power supply 3 and the lower gate drive power supply 5 are generated using the high voltage battery 2H as a power source. FIG. 2 illustrates a power supply circuit (50) configured by using a transformer with the high-voltage battery 2H as a power source. The power supply circuit (50) includes a switching element (51 (M1)) that controls a voltage applied to the primary coil and a power supply control circuit S5 (S) that controls the switching element (51). Has been. Here, a flyback configuration is illustrated as the power supply circuit (50). When the primary voltage to the transformer is stabilized, the output voltage on the secondary side is determined by the transformer transformation ratio without feeding back the output voltage on the secondary side to the primary side. That is, the backup power supply 3 having an output voltage of about 3.3 to 5 [V], for example, and the lower stage gate drive power supply 5 having an output voltage of about 15 to 20 [V], for example, are configured depending on the transformer transformation ratio. Has been.

  Note that the emitter side of the lower switching element of the inverter 1 shown in FIG. Accordingly, the lower switching element has a common negative electrode side (ground side), and the lower gate drive power source 5 can also be a power source having a common negative electrode side (ground side). For this reason, as shown in FIGS. 1 and 2, a gate drive power supply (5) for supplying power to all three lower gate drive circuits 20 is formed by a set of transformers. As described above, when the power supply for the driving circuit (4, 5) having a power supply voltage of about 20 [V] is generated from the high voltage battery 2H having a very high power supply voltage of 200 to 400 [V], the loss increases. However, the lower-stage side gate drive power supply 5 does not need to correspond to each phase (each arm) and can be shared, so that such a loss can be suppressed.

  As shown in FIG. 1, the upper side gate drive power supply 4 has the emitter side of the upper stage side switching element connected to the stator of the motor 90 and has different potentials. Therefore, unlike the lower gate drive power supply 5, the upper gate drive power supply 4 cannot be shared, and is configured to correspond to each phase (each arm). In the present embodiment, since the upper gate drive power supply 4 having a power supply voltage of about 20 [V] is configured using the low-voltage battery 2L having a power supply voltage of 12 to 24 [V] as a power source, loss is suppressed. Can do.

  FIG. 3 illustrates a power supply circuit (upper stage gate drive power supply 4) configured using a transformer with the low-voltage battery 2L as a power source. The upper gate drive power supply 4 includes two switching elements (41 (M1) and 42 (M2)) that control the voltage applied to the primary coil, and a power supply control that controls these switching elements (41 and 42). Circuit S4 (S). Here, a push-pull type configuration is illustrated as the upper gate drive power supply 4. When the primary voltage to the transformer is stabilized, the output voltage on the secondary side is determined by the transformer transformation ratio without feeding back the output voltage on the secondary side to the primary side. That is, the upper stage side gate drive power supply 4 having an output voltage of about 15 to 20 [V], for example, is configured depending on the transformer transformation ratio.

  As described above, according to the present invention, it is possible to smoothly control the inverter even when the power source of the control circuit of the inverter is lost while suppressing an increase in the device scale.

[Other Embodiments]
Hereinafter, other embodiments of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.

(1) In the above description, the upper gate drive power supply 4 may be in the non-operating state during active short control, so the upper gate drive power supply 4 is configured with the low voltage battery 2L as a power source. An example is shown. However, the upper gate drive power supply 4 may also be configured using the high voltage battery 2H. The control circuit 30 that continues the operation by the backup power supply 3 performs switching control of all the switching elements 10 by using the high-voltage battery 2H as the power sources of both the upper stage gate drive power supply 4 and the lower stage gate drive power supply 5. In addition to the active short control, various fail-safe controls can be performed.

  Depending on the type of fail-safe control, the upper switching element may be switched and the lower switching element may be turned off. When such control is performed, a configuration in which the power source of the upper gate drive power source 4 is the high voltage battery 2H and the power source of the lower gate drive power source 5 is the low voltage battery 2L is also suitable. That is, it is also preferable that at least one of the upper stage side gate drive power supply 4 and the lower stage side gate drive power supply 5 is configured with the high voltage battery 2H as a power source.

(2) In the above description, a mode in which the gate drive circuit 20 and the gate drive power supply (3, 4) are provided is illustrated. However, the gate drive circuit 20 and the gate drive power supply (3, 4) may not be provided as long as the signal amplitude necessary for the switching element 10 is ensured on the high voltage circuit side of the insulating component IS.

  The present invention can be used in a rotating electrical machine control device that drives and controls an AC rotating electrical machine.

1: Inverter 2H: High voltage battery (high voltage DC power supply)
2L: Low voltage battery (low voltage DC power supply)
3: Backup power supply 4: Upper gate drive power supply (power supply for upper drive circuit)
5: Lower-stage gate drive power supply (lower-stage drive circuit power supply)
6: Control circuit drive power supply 7: Power supply changeover switch 10: Switching element 20: Gate drive circuit (control signal drive circuit)
30: Control circuit (inverter controller)
66: Capacitor 90: Motor (rotary electric machine)

Claims (2)

A rotating electrical machine control device for driving and controlling an AC rotating electrical machine,
An inverter that is interposed between the high-voltage DC power supply and the rotating electrical machine and performs power conversion between DC and AC;
An inverter control device that is a power source having a voltage lower than that of the high-voltage DC power source, operates with power supplied from a low-voltage DC power source that is insulated from the high-voltage DC power source, and controls switching of the switching elements of the inverter;
The high-voltage DC power supply is configured as a power source, and a backup power supply capable of supplying power to the inverter control device;
In a low-voltage power supply lowered state in which the power supplied from the low-voltage DC power source to the inverter control device is equal to or lower than a predetermined reference value, a power supply path is provided so as to supply power from the backup power source to the inverter control device. A power switch for switching ,
The arm for one phase of AC constituting the inverter is constituted by a series circuit of an upper stage side switching element and a lower stage side switching element that are complementarily switched and controlled.
A control signal drive circuit that relays a switching control signal that is generated by the inverter control device and controls each switching element;
A drive circuit power supply for supplying power to each of the control signal drive circuits,
Among the drive circuit power supplies, the upper drive circuit power supply that supplies power to the control signal drive circuit that relays the switching control signal to the upper switch element is configured with the low-voltage DC power supply as a power source, The rotating electrical machine control apparatus , wherein the lower-stage driving circuit power supply that supplies power to the control signal driving circuit that relays the switching control signal to the lower-stage switching element is configured using the high-voltage DC power supply as a power source . The rotating electrical machine control device according to claim 1, further comprising a capacitor that stabilizes a power supply voltage of the inverter control device between the power supply switch and the inverter control device.

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