Rotary electric machine controller

Abstract

To continue supply of electric power to an in-vehicle device different from an open-winding type rotary electric machine while controlling drive of the rotary electric machine and continuing travel of a vehicle even in a case where there is a defect in a driving circuit for driving the rotary electric machine, while suppressing the redundancy of the driving circuit .SOLUTION: A rotary electric machine controller opens a first contact S1 and connects a second contact S2 when a first current power source 3 becomes defective, and performs switching control on a second inverter 2 in a first mode of supplying electric power to a rotary electric machine 80. Also, the rotary electric machine controller executes a first fail-safe control of performing switching control on a first inverter 1 in a second mode of receiving electric power from the rotary electric machine 80, thereby controlling drive of the rotary electric machine 80 by electric power of a second DC power source 4, and supplies electric power from the second DC power source 4 to an in-vehicle device 9.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine control device that drives and controls a rotating electrical machine having a multi-phase open winding via a first inverter and a second inverter.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2014-192950 discloses a rotating electrical machine control device that drives and controls a rotating electrical machine having a multi-phase open winding (11-13) via a first inverter (20) and a second inverter (30). (In the background art, the reference numerals in parentheses refer to the cited document.) A first DC power supply (41) is connected to the first inverter (20), and a second DC power supply (42) is connected to the second inverter (30). In this rotating electrical machine control device, when a failure occurs in the switching element of the first inverter (20) or when a failure occurs in the switching element of the second inverter (30), the vehicle can continue to run by so-called degraded operation. Specifically, the rotating electrical machine control device neutralizes one inverter including the failed switching element by short-circuiting it, and continues to control the rotating electrical machine using the other inverter that does not include the failed switching element. For example, when a switching element of the first inverter (20) fails, the first inverter (20) is neutralized, and degraded operation is performed using the second inverter (30).

[0003] At this time, it is not necessary to supply power from the first DC power supply (41) to the first inverter (20). Therefore, in many cases, the electrical connection between the first inverter (20) and the first DC power supply (41) is interrupted.

[0004] Incidentally, the above-described first DC power supply (41) and second DC power supply (42) are generally so-called high-voltage batteries with a rated voltage of 200 volts or more. Generally, vehicles are also equipped with so-called low-voltage batteries with a rated voltage of about 12 volts or 24 volts. And in vehicles having a high-voltage battery for supplying power to a rotating electric machine, such as electric vehicles and hybrid vehicles, in many cases, the voltage of the high-voltage battery is stepped down so that the low-voltage battery is charged. As described above, when the power supply to the inverter is interrupted, there is a risk that the power supply to the low-voltage battery will also be cut off.

[0005] Japanese Patent Application Laid-Open No. 2018-196177 discloses a vehicle power system including, in addition to high-voltage batteries (first high-voltage battery (10), second high-voltage battery (11)), a low-voltage battery (70) that is charged by stepping down the voltage of the high-voltage battery by a converter or the like. Between the first high-voltage battery (10) and the first inverter (20), and between the second high-voltage battery (11) and the second inverter (30), contactors (first contactors (SMR1, SMR2), second contactors (SMR3, SMR4)) are provided, respectively, and the electrical connection between the high-voltage battery and the inverter can be interrupted. The first high-voltage battery (10) and the low-voltage battery (70) are connected via the first contactor (SMR1) and the first converter (50). Therefore, even when the first inverter (20) is neutralized and the above-described degenerate running is performed, the power supply to the low-voltage battery (70) is maintained.

[0006] When a failure occurs in the switching element of the inverter, the vehicle can perform a degraded operation as described above. However, the high-voltage battery may also fail. For example, when the first high-voltage battery (10) fails, the vehicle can perform a degraded operation by neutral-point grounding the first inverter (20) in which the switching element operates normally. However, since the first contactor (SMR1) is disconnected, power cannot be supplied to the low-voltage battery (70) via the first converter (50). Therefore, in the power supply system disclosed in Japanese Patent Application Laid-Open No. 2018-196177, in addition to the first converter (50), a second converter (60) that steps down the voltage of the second high-voltage battery (11) to supply power to the low-voltage battery (70) is also provided. That is, by duplicating the converter, the system is configured to be able to cope not only with the failure of the inverter but also with the failure of the high-voltage battery (DC power supply).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] As described above, when configuring a system that can widely cope with failures of an inverter and a DC power supply connected to the inverter, it is conceivable to make the system redundant, such as providing a plurality of in-vehicle devices such as a converter that steps down the voltage of the DC power supply. However, generally, in a power circuit, the physical size of the circuit components is large, and as the voltage increases and the flowing current increases, the physical size becomes even larger, requiring a large installation space and increasing the component cost.

[0009] Therefore, while suppressing the redundancy of a drive circuit that drives a rotating electrical machine having an open winding connected to different DC power supplies via a plurality of inverters, even when a failure occurs in the drive circuit including the plurality of inverters and the plurality of DC power supplies, it is desired to provide a technology capable of driving and controlling the rotating electrical machine to continue the vehicle's running and also continuing to supply power to in-vehicle devices different from the rotating electrical machine.

Means for Solving the Problem

[0010] A rotating electrical machine control device in view of the above is a rotating electrical machine control device that drives and controls a rotating electrical machine having a plurality of open windings through a first inverter and a second inverter, wherein the first inverter is connected to a first DC power supply via a first contactor, the second inverter is connected to a second DC power supply independent of the first DC power supply via a second contactor, the first DC power supply is connected to an in-vehicle device different from the rotating electrical machine via the first contactor, the first inverter and the second inverter each have a leg for one phase of alternating current configured by a series circuit of an upper switching element and a lower switching element, the first inverter is connected to the first DC power supply and one end side of the plurality of open windings to convert power between DC on the first DC power supply side and alternating current of a plurality of phases, the second inverter is connected to the second DC power supply and the other end side of the plurality of open windings to convert power between DC on the second DC power supply side and alternating current of a plurality of phases, the rotating electrical machine control device can control each of the first inverter and the second inverter independently of each other, and when any one of the first inverter, the second inverter, the first DC power supply, and the second DC power supply fails, failsafe control is executed. When the first DC power supply fails, as the failsafe control, the first contactor is opened and the second contactor is connected, and the second inverter is switched and controlled in a first mode of supplying power to the rotating electrical machine, and the first inverter is switched and controlled in a second mode of receiving power from the rotating electrical machine. The first failsafe control is executed to drive and control the rotating electrical machine with the power of the second DC power supply and supply the power from the second DC power supply to the in-vehicle device.

[0011] According to this configuration, even when the first DC power supply that supplies power to the in-vehicle device fails, power can be supplied from the second DC power supply to the in-vehicle device via the second inverter, the open winding, and the first inverter. Also, since power is supplied from the second DC power supply to the open winding via the second inverter, the driving of the rotating electrical machine can also be continued. Since no additional circuit is provided other than the circuit for driving and controlling the rotating electrical machine, the driving control of the rotating electrical machine can be continued while supplying power from the second DC power supply to the in-vehicle device without adding redundancy to the circuit. That is, according to this configuration, while suppressing the redundancy of the drive circuit for driving a rotating electrical machine having an open winding connected to different DC power supplies via a plurality of inverters, even when a failure occurs in the drive circuit including the plurality of inverters and the plurality of DC power supplies, the rotating electrical machine can be driven and controlled to continue the running of the vehicle, and power supply to an in-vehicle device different from the rotating electrical machine can also be continued.

[0012] Further features and advantages of the rotating electrical machine control device will become clear from the following description of exemplary and non-limiting embodiments with reference to the drawings.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiment for Carrying Out the Invention

[0014] Hereinafter, an embodiment of a rotating electrical machine control device that drives and controls a rotating electrical machine having a multi-phase open winding via two inverters will be described with reference to the drawings. FIG. 1 is a schematic circuit block diagram of a rotating electrical machine drive system 100 including a rotating electrical machine control device 10. The rotating electrical machine 80 to be driven is, for example, a driving power source for wheels in a vehicle such as an electric vehicle or a hybrid vehicle. The rotating electrical machine 80 is an interior permanent magnet synchronous motor (IPMSM) having a stator in which a plurality of phase (N-phase, where N is an arbitrary natural number, and in this embodiment, a three-phase form with N = 3 is exemplified) stator coils 8 are arranged, and a rotor in which permanent magnets are arranged. In this embodiment, the rotating electrical machine 80 is an open winding type rotating electrical machine having a plurality of phase (three-phase in this embodiment) stator coils 8 (open windings). Here, the open winding means that, for example, the windings of a plurality of phases are not physically connected to each other at the neutral point, and the windings of a plurality of phases are physically arranged independently of each other. Such a configuration is well known, and in this embodiment, the illustration of the stator, rotor, permanent magnets, etc. is omitted. One inverter that is independently controlled and converts power between direct current and alternating current of a plurality of phases (here, three phases) is connected to each end of the stator coil 8. That is, the first inverter 1 is connected to one end side of the stator coil 8, and the second inverter 2 is connected to the other end side of the stator coil 8. Hereinafter, when there is no need to distinguish between the first inverter 1 and the second inverter 2, they will be simply referred to as inverters for explanation.

[0015] The inverter is configured to have a plurality of switching elements 5. As the switching element 5, an IGBT (Insulated Gate Bipolar Transistor), a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a HEMT (High Electric Mobility Transistor), etc. are used. Fig. 1 exemplifies a form in which an IGBT is used as the switching element 5. In the present embodiment, the first inverter 1 and the second inverter 2 are inverters having the same circuit configuration using the same type of switching element 5.

[0016] Each of the two inverters is configured by a series circuit of an upper-stage switching element 51 and a lower-stage switching element 52 for one-phase alternating current. In each of the legs of multiple phases, the side including the upper-stage switching element 51 is referred to as the upper-stage arm, and the side including the lower-stage switching element 52 is referred to as the lower-stage arm. Further, each switching element 5 is provided with a freewheel diode in parallel with the direction from the negative electrode to the positive electrode (the direction from the lower stage to the upper stage) defined as the forward direction. Note that in the case of using a body diode or using reverse conduction in a transistor of a wide bandgap semiconductor composed of enhancement-mode gallium nitride (E-GaN), etc., such a freewheel diode may not be provided.

[0017] Also, in the present embodiment, the two inverters are each connected to an independent DC power supply. Therefore, the first floating ground which is the negative electrode on the DC side of the first inverter 1 and the second floating ground which is the negative electrode on the DC side of the second inverter 2 are independent of each other. Further, between the inverter and the DC power supply, a DC link capacitor (smoothing capacitor) for smoothing the DC voltage (DC link voltage) is provided.

[0018] Specifically, the first inverter 1 has a first DC link capacitor C1 connected to smooth the first DC link voltage on the DC side, the DC side is connected to the first DC power supply 3, and the AC side is connected to one end side of a multi-phase stator coil 8 to convert power between DC and multi-phase AC. The second inverter 2 has a second DC link capacitor C2 connected to smooth the second DC link voltage on the DC side, the DC side is connected to the second DC power supply 4, and the AC side is connected to the other end side of the multi-phase stator coil 8 to convert power between DC and multi-phase AC.

[0019] The rated voltage of the DC power supply is from 48 volts to 800 volts, preferably about 200 to 800 volts. The DC power supply is composed of, for example, a secondary battery (battery) such as a nickel-metal hydride battery or a lithium-ion battery, or a power storage element such as an electric double layer capacitor.

[0020] Also, a first DC link voltage sensor 31 for detecting the first DC link voltage is provided on the DC side of the first inverter 1, and a second DC link voltage sensor 41 for detecting the second DC link voltage is provided on the DC side of the second inverter 2.

[0021] The DC power supply is connected to the inverter via a contactor so that the electrical connection with the inverter can be disconnected. Specifically, the first inverter 1 is connected to the first DC power supply 3 via a first contactor S1, and the second inverter 2 is connected to a second DC power supply 4 electrically independent of the first DC power supply 3 via a second contactor S2. The first contactor S1 and the second contactor S2 are, for example, relays, and are controlled to open and close by a rotating electrical machine control device 10 or a vehicle control device (not shown). Note that the relay may be a mechanical relay or a semiconductor relay (SSR: Solid State Relay).

[0022] The DC link capacitor is arranged on the inverter side with a contactor in between, and is arranged so that the electrical connection with the DC power supply can be disconnected by opening and closing the contactor. On the other hand, the DC link capacitor is always connected to the inverter.

[0023] One of the DC power supplies is connected via a contactor to an in-vehicle device 9 that is separate from the rotating electric machine 80 (including the inverter), and also supplies power to the in-vehicle device 9. In this embodiment, the first DC power supply 3 is connected via the first contactor S1 to an in-vehicle device 9 (auxiliary machine 90, voltage converter 60, third DC power supply 6) that is separate from the rotating electric machine 80, the first inverter 1, and the second inverter 2, and supplies power to the in-vehicle device 9.

[0024] The third DC power supply 6 is a DC power supply having a rated voltage lower than that of the first DC power supply 3 and the second DC power supply 4, for example, a DC power supply having a rated voltage of 12 volts or 24 volts. The third DC power supply 6 is, for example, an in-vehicle battery mounted on a vehicle having only a conventional internal combustion engine as a driving force source for the wheels, and is a lead-acid battery. When distinguished by the rated voltage, the first DC power supply 3 and the second DC power supply 4 are high-voltage DC power supplies or high-voltage batteries, and the third DC power supply 6 is a low-voltage DC power supply or a low-voltage battery.

[0025] In a vehicle having a conventional internal combustion engine as a driving force source, charging of the in-vehicle battery has been performed by power supplied from, for example, an alternator that generates electricity using a part of the power of the internal combustion engine. However, in a hybrid vehicle or an electric vehicle equipped with a rotating electric machine as a driving force source for the wheels, the above-described high-voltage battery is mounted. Therefore, charging of the in-vehicle battery is performed by power supplied from the high-voltage battery without mounting a generator such as an alternator. Also in this embodiment, the third DC power supply 6 is supplied with power from the first DC power supply 3. However, as described above, since the rated voltage of the first DC power supply 3, which is a high-voltage battery, is higher than that of the third DC power supply 6, which is a low-voltage battery, the voltage is stepped down by the voltage converter 60 (step-down converter), and power is supplied from the first DC power supply 3 to the third DC power supply 6. The voltage converter 60 is a so-called DC / DC converter, and in consideration of insulation from the first DC power supply 3, it is preferably an isolated DC / DC converter using a transformer.

[0026] When the rated voltages of the first DC power supply 3 and the second DC power supply 4 are approximately 200 to 400 volts, as shown in FIG. 1, the output voltage of the first DC power supply 3 may be directly provided to auxiliary equipment 90 such as an in-vehicle air conditioner or an electric oil pump. However, when the rated voltage of the first DC power supply 3 exceeds 40 volts, power may be supplied to the auxiliary equipment 90 via a step-down converter in some cases. Therefore, the in-vehicle device 9 directly connected to the first DC power supply 3 may include only the voltage converter 60 without including the auxiliary equipment 90, unlike the form illustrated in FIG. 1. Further, the voltage converter 60 is not limited to a form that outputs a single voltage, and may have a multi-port output configuration in which, for example, a plurality of coils are provided on the secondary side of a transformer to output a plurality of voltages (the voltage values may be the same).

[0027] As shown in FIG. 1, a first discharge resistor R1 and a rapid discharge circuit 7 are connected in parallel to the first DC link capacitor C1, and a second discharge resistor R2 is connected in parallel to the second DC link capacitor C2. The rapid discharge circuit 7 is constituted by a series circuit of a third discharge resistor R3 and a third contactor S3. The first discharge resistor R1 and the second discharge resistor R2 function as passive discharge resistors (for example, about several tens of kiloohms). The third discharge resistor R3 is an active discharge resistor that functions when the third contactor S3 is closed and connected, and is a so-called rapid discharge resistor. The resistance value of the third discharge resistor R3 is about 1 / 100 of that of the passive resistor, and is, for example, about several hundreds to 1 kiloohm. The third contactor S3 may be a relay like the first contactor S1 and the second contactor S2, or may be a switching element such as a power transistor. The third contactor S3 is also controlled to be opened and closed by the rotation electric machine control device 10 or a vehicle control device (not shown).

[0028] The passive discharge resistor is constantly connected to the DC side of the inverter and discharges the charge remaining in the DC link capacitor. Since the passive discharge resistor is constantly connected to the DC side of the inverter, it has a relatively large resistance value so that the loss is small. The resistance value is set to a relatively large value within the range where the charge remaining in the DC link capacitor can be discharged (including discharging so as not to accumulate) within a specified time.

[0029] The third discharge resistor R3, which is an active discharge resistor (rapid discharge resistor), does not function when the rotating electrical machine drive system 100 is operating normally because the third contactor S3 is open. When the rotating electrical machine drive system 100 stops, the charge accumulated in the DC link capacitor (for example, the first DC link capacitor C1) is rapidly discharged through the third discharge resistor R3 when the third contactor S3 is connected. The active discharge resistor is not constantly connected to the DC side of the inverter and is connected only when rapid discharge is required. For this reason, it has a relatively small resistance value so that the DC link voltage becomes equal to or lower than a specified value within a specified discharge time without considering the loss.

[0030] Note that the first discharge resistor R1 and the third contactor S3 may be connected in parallel, and the third discharge resistor R3 may be connected in series to the parallel circuit. In this case, when the third contactor S3 is in the open state, the series circuit of the first discharge resistor R1 and the third discharge resistor R3 (resistance value: R1 + R3) functions as a passive discharge resistor. Also, when the third contactor S3 is connected, the series circuit of the third discharge resistor R3 and the third contactor S3 functions as a rapid discharge circuit 7. The active discharge resistor (rapid discharge resistor) is the third discharge resistor R3, similar to the form illustrated in FIG. 1.

[0031] The rotating electrical machine 80 can function as both a motor and a generator. The rotating electrical machine 80 converts the power from the DC power source into motive power via the inverter (power running). Alternatively, the rotating electrical machine 80 converts the rotational driving force transmitted from the wheels or the like into electric power and charges the DC power source via the inverter (regeneration).

[0032] As shown in FIG. 1, the inverter is controlled by a rotating electrical machine control device 10. The rotating electrical machine control device 10 can independently control each of the first inverter 1 and the second inverter 2. When the first inverter 1 and the second inverter 2 are controlled such that the waveform of the AC voltage output from the first inverter 1 and the phase of the AC voltage output from the second inverter 2 are different by 180 degrees (π), the amplitude of the AC voltage can be doubled. That is, a higher driving force can be obtained compared to the case where the rotating electrical machine 80 is driven by one inverter. Naturally, not only such a phase difference, but the rotating electrical machine control device 10 can control each of the first inverter 1 and the second inverter 2 in different control methods.

[0033] Examples of the control method include a method of switching control of the inverter by pulse width modulation control, a method of switching control of the inverter by rectangular wave control, a shutdown control in which all switching elements of the inverter are turned off, and an active short circuit control in which all switching elements 5 on one side of the upper and lower sides are turned off and all switching elements 5 on the other side are turned on. Note that the active short circuit control includes a lower side active short circuit control in which all upper side switching elements 51 of one inverter are turned off and all lower side switching elements 52 are turned on, and an upper side active short circuit control in which all upper side switching elements 51 of one inverter are turned on and all lower side switching elements 52 are turned off. Also, in pulse width modulation control and rectangular wave control, there are a power running mode and a regeneration mode.

[0034] The rotational electric machine control device 10 is constructed with a logic circuit such as a microcomputer as the core member. The rotational electric machine control device 10 controls the rotational electric machine 80 based on the current of the rotational electric machine 80. The current of the rotational electric machine 80 is determined according to the target torque (torque command) of the rotational electric machine 80 provided from another control device such as a vehicle control device (not shown). For example, the rotational electric machine control device 10 performs current feedback control using the vector control method based on the target torque of the rotational electric machine 80, and controls the rotational electric machine 80 via an inverter. In the vector control method, the actual current (U-phase current Iu, V-phase current Iv, W-phase current Iw) flowing through the rotational electric machine 80 is coordinate-transformed into vector components (d-axis current Id, q-axis current Iq) of a d-axis, which is the direction of the magnetic field (magnetic flux) generated by the permanent magnet disposed on the rotor of the rotational electric machine 80, and a q-axis in a direction orthogonal to the d-axis (a direction advanced by an electrical angle of π / 2 with respect to the direction of the magnetic field), and feedback control is performed. In FIG. 3 and the like, the current flowing through the stator coil 8 in this vector coordinate system is shown as a vector “i mot ”.

[0035] The actual current flowing through each phase of the stator coil 8 of the rotational electric machine 80 is detected by a current sensor 82, and the magnetic pole position at each time point of the rotor of the rotational electric machine 80 is detected by a rotation sensor 81 such as a resolver or an inductive position sensor. The rotational electric machine control device 10 performs coordinate transformation in a three-phase to two-phase coordinate transformation unit 55 based on the detection result (θ (magnetic pole position, electrical angle)) of the rotation sensor 81. The rotational electric machine control device 10 executes current feedback control using the detection result (U-phase current Iu, V-phase current Iv, W-phase current Iw) of the current sensor 82 and the detection result (θ, ω (rotation speed, angular velocity)) of the rotation sensor 81. The rotational electric machine control device 10 is configured to have various functional units for current feedback control, and each functional unit is realized by the cooperation of hardware such as a microcomputer and software (program).

[0036] Figure 2 schematically shows the energy flow in a vehicle during normal operation, and Figure 3 shows the relationship between the voltage vector of the inverter and the current vector flowing through the stator coil 8 in the dq-axis orthogonal coordinate system during normal operation. As shown in Figure 2, the first contactor S1 and the second contactor S2 are closed, and power is supplied from the first DC power supply 3 to the first inverter 1 and the in-vehicle device 9, and power is supplied from the second DC power supply 4 to the second inverter 2. Then, current is supplied to the stator coil 8 (open winding) through the first inverter 1 and the second inverter 2, and the rotating electrical machine 80 outputs torque. The voltage vector of the first inverter 1 and the voltage vector of the second inverter 2 are vectors with opposite directions.

[0037] When losses are not considered, let the output power from the first DC power supply 3 be P b1 , the output power from the second DC power supply 4 be Pb 2 , the AC output power output from the first inverter 1 be P INV1 , the AC output power output from the second inverter 2 be P INV2 , the AC output power output from the two inverters be P INV , and the driving force (torque) output from the rotating electrical machine 80 be P mot . Then, the following formula (1) holds. In the following formula (1), for simplicity, the power to the in-vehicle device 9 is not considered when formulating. Therefore, "P b1 " is exactly the power output from the first DC power supply 3 to the first inverter 1.

[0038] P b1 +P b2 =P INV1 +P INV2 =P INV =P mot ···(1)

[0039] For example, in the vector diagram shown in Figure 3, a form where P INV1 and P INV2 are the same is illustrated, but the outputs of the two inverters can be freely selected. That is, the rotating electrical machine control device 10 makes P INV unchanged, and P INV1 and PINV2 The distribution with it can be appropriately set.

[0040] Here, when a failure occurs in the first DC power supply 3, power is no longer supplied from the first DC power supply 3 to the first inverter 1 and the in-vehicle device 9. Therefore, in this embodiment, the electric motor control device 10 executes fail-safe control, and power is supplied from the second DC power supply 4 to the in-vehicle device 9 via the second inverter 2 and the first inverter 1. The electrical connection between the first inverter 1 and the in-vehicle device 9 and the first DC power supply 3 is interrupted by opening the first contactor S1.

[0041] That is, when the first DC power supply 3 fails, the electric motor control device 10, as fail-safe control, opens the first contactor S1 and connects the second contactor S2, and performs switching control on the second inverter 2 in a first mode (here, the power running mode) that supplies power to the electric motor 80, and performs switching control on the first inverter 1 in a second mode (here, the regeneration mode) that receives power from the electric motor 80, and executes first fail-safe control. Thereby, the electric motor 80 is driven and controlled by the power of the second DC power supply 4, and the power from the second DC power supply 4 is supplied to the in-vehicle device 9. Note that "connecting the second contactor S2" also includes maintaining (continuing) the state of the second contactor S2 in a non-open state (closed state), and is not limited to changing the second contactor S2 in an open state to a non-open state.

[0042] Also, in the example described above with reference to FIGS. 2 and 3, the first mode is the power running mode and the second mode is the regeneration mode. However, in the first mode, power corresponding to the output of the rotating electrical machine 80 and power corresponding to the power consumption of the in-vehicle device 9 are supplied from the side of the second inverter 2 to the side of the rotating electrical machine 80. In the second mode, the first inverter 1 may draw power corresponding to the power consumption of the in-vehicle device 9 from the side of the rotating electrical machine 80. When the rotating electrical machine 80 is power-driven, as described above, the first mode is the power running mode. When the rotating electrical machine 80 is regeneration-driven, the rotating electrical machine control device 10 can control part of the power generated by the rotating electrical machine 80 to be received by the second inverter 2 and supplied to the second DC power source 4, while the rest is supplied to the side of the first inverter 1. That is, in the first mode, the rotating electrical machine control device 10 can control the second inverter 2 so that it does not receive all the power generated by the rotating electrical machine 80 but leaves part of it to the rotating electrical machine 80, which is equivalent to supplying power to the rotating electrical machine 80. Therefore, the first mode can include the regeneration mode. Since those skilled in the art can easily understand it, detailed description including illustration is omitted.

[0043] FIG. 4 schematically shows the energy flow in the vehicle when the first DC power source 3 fails, and FIG. 5 shows the relationship between the voltage vector of the inverter and the current vector flowing through the stator coil 8 when the first DC power source 3 fails in the dq-axis orthogonal coordinate system. As shown in FIG. 4, since the first DC power source 3 has failed and the first contactor S1 is also open, no power is supplied from the first DC power source 3 to either the first inverter 1 or the in-vehicle device 9. The second contactor S2 is closed, and power is supplied from the second DC power source 4 to the second inverter 2 and also to the first inverter 1 via the stator coil 8. When current flows through the stator coil 8, the rotating electrical machine 80 outputs torque. Further, the excess power used to generate the torque of the rotating electrical machine 80 is supplied to the first inverter 1, and power is also supplied to the in-vehicle device 9 via the first inverter 1 that is switching-controlled in the regeneration mode.

[0044] As shown in Fig. 5, the magnitude of the voltage vector of the second inverter 2 is larger than that of the voltage vector of the first inverter 1. And the directions of the voltage vector of the first inverter 1 and the voltage vector of the second inverter 2 are different, and the sum of the voltage vector of the second inverter 2 and the voltage vector of the first inverter 1 becomes the voltage vector used to pass a current through the stator coil 8. Incidentally, in this example, the power factor (absolute value) in the first inverter 1 is made "1" to improve the efficiency by setting the voltage vector "V inv1 " of the first inverter 1 as a vector parallel to the current vector "i mot ". In this case, the magnitude of the voltage vector "V inv2 " of the second inverter 2 becomes the minimum.

[0045] When flowing the same current as the current vector illustrated in Fig. 4 through the stator coil 8, the second inverter 2 needs to output, in addition to the sum of the voltage vector of the first inverter 1 and the voltage vector of the second vector in Fig. 4, also the voltage for the power supplied to the in-vehicle device 9. Fig. 5 illustrates such voltage vectors. However, since there is also an upper limit to the energy that can be supplied by the second DC power source 4 and the second inverter 2, the magnitude of the current flowing through the stator coil 8 (the magnitude of the current vector "i mot ") may be reduced to suppress the output torque of the rotating electric machine 80 and continue the running of the vehicle. For this reason, while the fail-safe control is being executed, it can be said that the vehicle is running by "degraded running" in which the vehicle continues to run while suppressing the maximum output of the vehicle.

[0046] Considering from the driving side of the rotating electrical machine 80, in this case, the maximum value of the AC power that can be output from the second inverter 2 to the stator coil 8 varies depending on the power required by the in-vehicle device 9. When the in-vehicle device 9 consumes a large amount of power, the voltage on the DC side of the first inverter 1 (the first DC link voltage) may decrease. As shown in FIG. 1, the rotating electrical machine drive system 100 includes a first DC link voltage sensor 31 that detects the first DC link voltage. Based on the detection result of the first DC link voltage sensor 31, the rotating electrical machine control device 10 calculates the required value of the power regenerated via the first inverter 1 (the regeneration command value), and based on this regeneration command value and the required torque of the rotating electrical machine 80 (the torque command value), determines the required value of the power (the power running command value) output from the second inverter 2 to the stator coil 8 side. Then, the rotating electrical machine control device 10 performs switching control of the second inverter 2 based on the power running command value to supply the energy from the second DC power source 4 to the stator coil 8 side.

[0047] As described above, in the first fail-safe control, the rotating electrical machine control device 10 performs switching control of the second inverter 2 so as to output the power obtained by adding the power for outputting the required torque of the rotating electrical machine 80 and the power required by the in-vehicle device 9. Also, in the first fail-safe control, the rotating electrical machine control device 10 performs switching control of the second inverter 2 based on the current of the rotating electrical machine 80 and the voltage on the DC side of the first inverter 1 (the first DC link voltage). In the first fail-safe control, for example, feedback control based on the current flowing through the stator coil 8 with the required torque of the rotating electrical machine 80 as the target is executed, and feedback control based on the first DC link voltage is executed.

[0048] As an example, the rotating electrical machine control device 10 determines the power (the power for regeneration) “P inv1 ” supplied to the first inverter 1 side based on the fed-back first DC link voltage. Next, the rotating electrical machine control device 10 determines the voltage “V inv1 ” of the first inverter 1 based on this power “P mot ” and the current “I inv1” is determined. As described above, when the power factor (absolute value) is “1”, “V inv1 =P inv1 / I mot ”. Then, as described above with reference to FIG. 5, the rotating electrical machine control device 10 determines the voltage “V inv2 ” of the second inverter 2.

[0049] In the present embodiment, the rotating electrical machine control device 10 executes fail-safe control not only when the first DC power supply 3 fails, but also when any one of the first inverter 1, the second inverter 2, the first DC power supply 3, and the second DC power supply 4 fails. In principle, when any one of these fails, the rotating electrical machine control device 10 executes fail-safe control. As described above, when the first DC power supply 3 fails, the first fail-safe control is executed. Then, as will be described later, when the first inverter 1 fails, the second fail-safe control is executed, when the second inverter 2 fails, the third fail-safe control is executed, and when the second DC power supply 4 fails, the fourth fail-safe control is executed.

[0050] Hereinafter, the second fail-safe control, the third fail-safe control, and the fourth fail-safe control will be described. Since the vector diagram as shown in FIG. 5 can be analogized from the above description, the illustration thereof is omitted, and the energy flow similar to that in FIG. 4 is exemplified and described with reference to FIGS. 6 to 8. FIG. 6 schematically shows the energy flow in the vehicle when the second fail-safe control is executed (when the first inverter 1 fails), FIG. 7 schematically shows the energy flow in the vehicle when the third fail-safe control is executed (when the second inverter 2 fails), and FIG. 8 schematically shows the energy flow in the vehicle when the fourth fail-safe control is executed (when the second DC power supply 4 fails).

[0051] As shown in FIG. 6, when the first inverter 1 fails, the first inverter 1 is short-circuited and neutralized. That is, the rotating electrical machine 80 is changed from the open-winding type to the Y-connection type in which the stator coil 8 is short-circuited at the neutral point, and the rotating electrical machine control device 10 drives and controls the rotating electrical machine 80 by the second inverter 2. Electric power is supplied to the rotating electrical machine 80 from the second DC power supply 4, and electric power is supplied to the in-vehicle device 9 from the first DC power supply 3.

[0052] That is, when the first inverter 1 fails, the rotating electrical machine control device 10, as fail-safe control, connects the first contactor S1 and the second contactor S2, and performs switching control in the first mode in which the second inverter 2 supplies electric power to the rotating electrical machine 80, and at the same time, executes the second fail-safe control for controlling the first inverter 1 by the upper-stage active short-circuit control or the lower-stage active short-circuit control, drives and controls the rotating electrical machine 80 by the electric power of the second DC power supply 4, and supplies the electric power from the first DC power supply 3 to the in-vehicle device 9. In addition, when the upper-stage switching element 51 of the first inverter 1 has a short-circuit failure, or when the lower-stage switching element 52 has an open failure, the rotating electrical machine control device 10 controls the first inverter 1 by the upper-stage active short-circuit control, and when the lower-stage switching element 52 of the first inverter 1 has a short-circuit failure, or when the upper-stage switching element 51 has an open failure, the rotating electrical machine control device 10 controls the first inverter 1 by the lower-stage active short-circuit control.

[0053] Here, the "short-circuit failure" means a failure in which the switching element 5 is always in the on state (the resistance value between the drain and the source, or between the collector and the emitter is 100 ohms or less, which is extremely small, and includes a state close to the on state), and the "open failure" means a failure in which the switching element is not in the on state and is always in the off state (the resistance value between the drain and the source, or between the collector and the emitter is several kiloohms or more, which is extremely large, and includes a state close to the off state).

[0054] Generally, a failure as described above may occur in one of the plurality of switching elements that make up the inverter. However, it does not prevent failures from occurring in two or more switching elements simultaneously. For example, not only when only one of the upper-stage switching elements 51 of the first inverter 1 has a short-circuit failure, but two or more of the upper-stage switching elements 51 may have a short-circuit failure, and all the remaining upper-stage switching elements 51 and all the lower-stage switching elements 52 may not be faulty. Naturally, all of the upper-stage switching elements 51 may have a short-circuit failure and all of the lower-stage switching elements 52 may not be faulty. The same applies when "upper stage" and "lower stage" are interchanged (when "short-circuit failure" and "open failure" are interchanged). The same also applies in the third fail-safe control described later.

[0055] Also, when the upper-stage switching element 51 of the first inverter 1 has a short-circuit failure, or when it is referred to as the case where the lower-stage switching element 52 has an open failure, the "or" is not limited to the state where a failure occurs only in the "upper stage" or the state where a failure occurs only in the "lower stage". Even when the upper-stage switching element 51 of the first inverter 1 has a short-circuit failure and the lower-stage switching element 52 has an open failure, the second fail-safe control may be executable in some cases. All of the plurality of upper-stage switching elements 51, including the switching element with a short-circuit failure, can be in the on state. Also, all of the plurality of lower-stage switching elements 52, including the switching element with an open failure, can be in the off state. Therefore, the rotary electric machine control device 10 can perform switching control of the first inverter 1 by upper-stage active short-circuit control and execute the second fail-safe control even when the upper-stage switching element 51 of the first inverter 1 has a short-circuit failure and the lower-stage switching element 52 has an open failure. The same applies in the lower-stage active short-circuit control. The same also applies in the third fail-safe control described later.

[0056] As shown in FIG. 7, when the second inverter 2 fails, the second inverter 2 is short-circuited and neutralized. Also in this case, the rotating electrical machine 80 is changed from the open-winding type to the Y-connection type in which the stator coil 8 is short-circuited at the neutral point, and the rotating electrical machine control device 10 drives and controls the rotating electrical machine 80 by the first inverter 1. Power is supplied to the rotating electrical machine 80 from the first DC power supply 3, and power is also supplied to the in-vehicle device 9 from the first DC power supply 3.

[0057] That is, when the second inverter 2 fails, the rotating electrical machine control device 10, as fail-safe control, connects the first contactor S1, switches and controls the first inverter 1 in the power running mode to supply power to the rotating electrical machine 80, and executes third fail-safe control for controlling the second inverter 2 by upper-stage side active short circuit control or lower-stage side active short circuit control, drives and controls the rotating electrical machine 80 with the power of the first DC power supply 3, and supplies the power from the first DC power supply 3 to the in-vehicle device 9. The second contactor S2 may be connected or may be open. Note that when the upper-stage side switching element 51 of the second inverter 2 has a short-circuit failure and when the lower-stage side switching element 52 has an open failure, the rotating electrical machine control device 10 controls the second inverter 2 by upper-stage side active short circuit control, and when the lower-stage side switching element 52 of the second inverter 2 has a short-circuit failure and when the upper-stage side switching element 51 has an open failure, controls the second inverter 2 by lower-stage side active short circuit control.

[0058] As shown in FIG. 8, even when the second DC power supply 4 fails, the second inverter 2 is short-circuited and neutralized. Also in this case, the rotating electrical machine 80 is changed from the open-winding type to the Y-connection type in which the stator coil 8 is short-circuited at the neutral point, and the rotating electrical machine control device 10 drives and controls the rotating electrical machine 80 by the first inverter 1. Power is supplied to the rotating electrical machine 80 from the first DC power supply 3, and power is also supplied to the in-vehicle device 9 from the first DC power supply 3.

[0059] That is, when the second DC power supply 4 fails, as a fail-safe control, the rotation electric machine control device 10 connects the first contactor S1 and opens the second contactor S2, performs switching control on the first inverter 1 in a power running mode to supply power to the rotation electric machine 80, and executes a fourth fail-safe control for controlling the second inverter 2 by upper-stage active short-circuit control or lower-stage active short-circuit control, drives and controls the rotation electric machine 80 with the power of the first DC power supply 3, and supplies the power from the first DC power supply 3 to the in-vehicle device 9.

[0060] Hereinafter, the rotation electric machine control device described above will be briefly summarized.

[0061] In one aspect, a rotating electrical machine control device that drives and controls a rotating electrical machine having a multi-phase open winding via a first inverter and a second inverter, wherein the first inverter is connected to a first DC power supply via a first contactor, the second inverter is connected to a second DC power supply electrically independent of the first DC power supply via a second contactor, the first DC power supply is further connected to an in-vehicle device different from the rotating electrical machine via the first contactor, the first inverter and the second inverter each have a leg for one phase of alternating current configured by a series circuit of an upper switching element and a lower switching element, the first inverter is connected to the first DC power supply and one end side of the multi-phase open winding to convert power between DC on the first DC power supply side and multi-phase alternating current, the second inverter is connected to the second DC power supply and the other end side of the multi-phase open winding to convert power between DC on the second DC power supply side and multi-phase alternating current, the rotating electrical machine control device can control each of the first inverter and the second inverter independently of each other, and when any one of the first inverter, the second inverter, the first DC power supply, and the second DC power supply fails, failsafe control is executed. When the first DC power supply fails, as the failsafe control, the first contactor is opened and the second contactor is connected, and the second inverter is switched and controlled in a first mode of supplying power to the rotating electrical machine, and the first inverter is switched and controlled in a second mode of receiving power from the rotating electrical machine, and a first failsafe control is executed to drive and control the rotating electrical machine with the power of the second DC power supply and supply the power from the second DC power supply to the in-vehicle device.

[0062] According to this configuration, even when the first DC power supply that supplies power to the in-vehicle device fails, power can be supplied from the second DC power supply to the in-vehicle device via the second inverter, the open winding, and the first inverter. Also, since power is supplied from the second DC power supply to the open winding via the second inverter, the driving of the rotating electrical machine can also be continued. Since no additional circuit is provided other than the circuit for driving and controlling the rotating electrical machine, the control by the rotating electrical machine control device enables the power supply from the second DC power supply to the in-vehicle device while continuing the driving control of the rotating electrical machine without adding redundancy to the circuit. That is, according to this configuration, while suppressing the redundancy of the drive circuit for driving a rotating electrical machine having an open winding connected to different DC power supplies via a plurality of inverters, even when a failure occurs in the drive circuit including the plurality of inverters and the plurality of DC power supplies, the rotating electrical machine can be driven and controlled to continue the running of the vehicle, and the power supply to the in-vehicle device different from the rotating electrical machine can also be continued.

[0063] Further, in the first fail-safe control, it is preferable that the rotating electrical machine control device performs switching control of the second inverter so as to output power obtained by adding the power for outputting the required torque of the rotating electrical machine and the power required for the in-vehicle device.

[0064] According to this configuration, since the second inverter is switched and controlled so that the power for outputting the required torque of the rotating electrical machine is output, the vehicle can continue to run with the driving force of the rotating electrical machine. Also, since the second inverter is switched and controlled so that the power required for the in-vehicle device is output, sufficient power can be supplied to the in-vehicle device.

[0065] Further, in the first fail-safe control, it is preferable that the rotating electrical machine control device performs switching control of the second inverter based on the current of the rotating electrical machine and the voltage on the DC side of the first inverter.

[0066] According to this configuration, AC power for driving the rotating electrical machine based on the required torque can be output from the second inverter, and the second inverter can output AC power corresponding to the DC power that the first inverter needs to output in the second mode. Therefore, while appropriately continuing the running of the vehicle with the driving force of the rotating electrical machine, sufficient power can also be supplied to the in-vehicle devices.

[0067] Here, it is preferable that the in-vehicle device includes at least a third DC power source having a rated voltage lower than that of the first DC power source and the second DC power source, and a step-down converter that steps down the voltage on the DC side of the first inverter and supplies it to the third DC power source.

[0068] Such a third DC power source often supplies power to various control devices (so-called ECUs: Electric Control Units) in the vehicle, including the rotating electrical machine control device, power steering device, braking system, lighting device, etc. Therefore, when the power supply to the third DC power source is interrupted, it is likely to be difficult to continue the running of the vehicle. By including the third DC power source and the step-down converter in the in-vehicle device where the power supply is continued by fail-safe control, the running of the vehicle can be appropriately continued.

[0069] Also, control for turning off all the upper-stage switching elements and turning on all the lower-stage switching elements is defined as lower-stage active short-circuit control, and control for turning on all the upper-stage switching elements and turning off all the lower-stage switching elements is defined as upper-stage active short-circuit control. When the first inverter fails, as the fail-safe control, the rotation electric machine control device connects the first contactor and the second contactor and performs switching control in a first mode in which the second inverter supplies power to the rotation electric machine. When a short-circuit fault occurs in the upper-stage switching elements of the first inverter or an open fault occurs in the lower-stage switching elements, the first inverter is controlled by the upper-stage active short-circuit control. When a short-circuit fault occurs in the lower-stage switching elements of the first inverter or an open fault occurs in the upper-stage switching elements, a second fail-safe control for controlling the first inverter by the lower-stage active short-circuit control is executed to drive and control the rotation electric machine with the power of the second DC power source and supply the power from the first DC power source to the in-vehicle device, which is preferable.

[0070] According to this configuration, even when the first inverter fails, by executing the second fail-safe control, it is possible to appropriately supply power to the in-vehicle device while driving the rotation electric machine to continue the running of the vehicle.

[0071] Also, control for turning off all the upper-side switching elements and turning on all the lower-side switching elements is defined as lower-side active short-circuit control, and control for turning on all the upper-side switching elements and turning off all the lower-side switching elements is defined as upper-side active short-circuit control. When the second inverter fails, as the fail-safe control, the rotation electric machine control device connects the first contactor and performs switching control in a first mode in which the first inverter supplies power to the rotation electric machine. When the upper-side switching element of the second inverter has a short-circuit fault or the lower-side switching element has an open fault, the second inverter is controlled by the upper-side active short-circuit control. When the lower-side switching element of the second inverter has a short-circuit fault or the upper-side switching element has an open fault, a third fail-safe control for controlling the second inverter by the lower-side active short-circuit control is executed to drive and control the rotation electric machine with the power of the first DC power supply and supply the power from the first DC power supply to the in-vehicle device, which is preferable.

[0072] According to this configuration, even when the second inverter fails, by executing the third fail-safe control, it is possible to appropriately supply power to the in-vehicle device while driving the rotation electric machine to continue the running of the vehicle.

[0073] Also, control for turning off all the upper-stage switching elements and turning on all the lower-stage switching elements is defined as lower-stage active short-circuit control, and control for turning on all the upper-stage switching elements and turning off all the lower-stage switching elements is defined as upper-stage active short-circuit control. When the second DC power supply fails, as the fail-safe control, the rotation electric machine control device connects the first contactor and opens the second contactor, performs switching control in a first mode in which the first inverter supplies power to the rotation electric machine, and executes fourth fail-safe control for controlling the second inverter by the upper-stage active short-circuit control or the lower-stage active short-circuit control, drives and controls the rotation electric machine with the power of the first DC power supply, and supplies power from the first DC power supply to the in-vehicle device, which is preferable.

[0074] According to this configuration, even when the second DC power supply fails, by executing the fourth fail-safe control, it is possible to appropriately supply power to the in-vehicle device while driving the rotation electric machine to continue the vehicle's travel.

Explanation of Signs

[0075] 1: First inverter 2: Second inverter 3: First DC power supply 4: Second DC power supply 5: Switching element 6: Third DC power supply 8: Stator coil (open winding) 9: In-vehicle device 10: Rotation electric machine control device 51: Upper-stage switching element 52: Lower-stage switching element 60: Voltage converter (step-down converter) 80: Rotation electric machine S1: First contactor S2: Second contactor

Claims

1. A rotating electric machine control device that drives and controls a rotating electric machine having a plurality of open windings via a first inverter and a second inverter, the first inverter is connected to a first DC power source via a first contactor; the second inverter is connected via a second contactor to a second DC power source that is electrically independent of the first DC power source; the first DC power supply is further connected to an on-vehicle device different from the rotating electric machine via the first contactor; The first inverter and the second inverter each have a leg for one AC phase that is configured by a series circuit of an upper-stage switching element and a lower-stage switching element, the first inverter is connected to the first DC power source and one end side of the open winding of the multiple phases to convert power between DC on the side of the first DC power source and AC on the multiple phases; the second inverter is connected to the second DC power source and the other end side of the open winding of the multiple phases to convert power between DC on the side of the second DC power source and AC on the multiple phases; The rotating electric machine control device includes: The first inverter and the second inverter are independently controllable, performing a fail-safe control when any one of the first inverter, the second inverter, the first DC power supply, and the second DC power supply fails; When the first DC power supply fails, the fail-safe control is opening the first contactor and connecting the second contactor; performing a first fail-safe control in which the second inverter is switched in a first mode in which electric power is supplied to the rotating electric machine, and the first inverter is switched in a second mode in which electric power is received from the rotating electric machine; a rotating electric machine control device that drives and controls the rotating electric machine with power from the second DC power supply and supplies power from the second DC power supply to the vehicle-mounted device;

2. 2. The rotating electric machine control device according to claim 1, wherein in the first fail-safe control, the second inverter is switched and controlled to output a power that is a sum of a power for outputting a required torque of the rotating electric machine and a power required by the vehicle-mounted device.

3. 3 . The rotating electric machine control device according to claim 1 , wherein in the first fail-safe control, switching of the second inverter is controlled based on a current of the rotating electric machine and a voltage on a DC side of the first inverter. 4 .

4. 3. The rotating electric machine control device according to claim 1, wherein the in-vehicle device includes at least a third DC power source having a lower rated voltage than the first DC power source and the second DC power source, and a step-down converter that steps down a voltage on the DC side of the first inverter and supplies the voltage to the third DC power source.

5. a control in which all of the upper stage side switching elements are turned off and all of the lower stage side switching elements are turned on is called a lower stage side active short circuit control; A control in which all of the upper stage side switching elements are turned on and all of the lower stage side switching elements are turned off is called an upper stage side active short circuit control, When the first inverter fails, the fail-safe control is connecting the first contactor and the second contactor; The second inverter is switched in a first mode for supplying electric power to the rotating electric machine, a second fail-safe control is executed to control the first inverter by the upper-side active short circuit control when the upper-side switching element of the first inverter has a short-circuit failure or when the lower-side switching element of the first inverter has an open-circuit failure, and to control the first inverter by the lower-side active short circuit control when the lower-side switching element of the first inverter has a short-circuit failure or when the upper-side switching element has an open-circuit failure; 3 . The rotating electric machine control device according to claim 1 , wherein the rotating electric machine is driven and controlled by power from the second DC power supply, and power from the first DC power supply is supplied to the vehicle-mounted device. 4 .

6. a control in which all of the upper stage side switching elements are turned off and all of the lower stage side switching elements are turned on is called a lower stage side active short circuit control; A control in which all of the upper stage side switching elements are turned on and all of the lower stage side switching elements are turned off is called an upper stage side active short circuit control, When the second inverter fails, the fail-safe control is connecting the first contactor; The first inverter is switched in a first mode for supplying electric power to the rotating electric machine, a third fail-safe control is executed to control the second inverter by the upper-side active short circuit control when the upper-side switching element of the second inverter has a short-circuit failure or when the lower-side switching element of the second inverter has an open-circuit failure, and to control the second inverter by the lower-side active short circuit control when the lower-side switching element of the second inverter has a short-circuit failure or when the upper-side switching element has an open-circuit failure; 3 . The rotating electric machine control device according to claim 1 , wherein the rotating electric machine is driven and controlled by power from the first DC power source, and the power from the first DC power source is supplied to the vehicle-mounted device. 4 .

7. a control in which all of the upper stage side switching elements are turned off and all of the lower stage side switching elements are turned on is called a lower stage side active short circuit control; A control in which all of the upper stage side switching elements are turned on and all of the lower stage side switching elements are turned off is called an upper stage side active short circuit control, When the second DC power supply fails, the fail-safe control is closing the first contactor and opening the second contactor; The first inverter is switched in a first mode for supplying electric power to the rotating electric machine, executing a fourth fail-safe control to control the second inverter by the upper stage side active short circuit control or the lower stage side active short circuit control; 3 . The rotating electric machine control device according to claim 1 , wherein the rotating electric machine is driven and controlled by power from the first DC power source, and the power from the first DC power source is supplied to the vehicle-mounted device. 4 .

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