Rotating electrical machine device

Abstract

To obtain a rotating electrical machine device that makes it possible to determine whether a voltage sensor is abnormal by using voltage sensors for other purposes.SOLUTION: The rotating electrical machine device is constituted by including: a busbar-to-busbar voltage sensor of a DC power supply; a power conversion circuit having a plurality of cathode-side switching elements, anode-side switching elements, and legs connecting these in series and having external contacts provided thereto; a rotating electrical machine having coils one end of which are connected respectively to the external contacts of the power conversion circuit and the other end of which is connected to a neutral point; a cathode-side charging terminal connected to the neutral point of the rotating electrical machine via a neutral point switch; a charging terminal-to-terminal voltage sensor for detecting the voltage across the cathode-side and anode-side charging terminals; and a control determination unit for controlling the on / off of the switching elements, turning the cathode-side switching element and neutral point switch on while the rotating electrical machine is in a non-drive state, and comparing the busbar-to-busbar voltage and the charging terminal-to-terminal voltage to determine whether abnormal or not.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present application relates to a rotating electrical machine device.

Background Art

[0002] In recent years, plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) have become popular. These vehicles convert the electric power stored in a DC power source (also referred to as a battery) into rotational force by a power conversion device to make the vehicle run. The power conversion device converts the output form of the electric power to control a rotating electrical machine (collectively referred to as a rotating electrical machine, including an electric motor and a generator). As the power conversion device, an AC / DC converter (Alternating Current / Direct Current Converter) that converts AC power into DC power, an inverter that converts DC power into AC power, etc. are common. The power conversion device that controls these rotating electrical machines often has a configuration including semiconductor switching elements. A control device that controls a rotating electrical machine using a power conversion device and the rotating electrical machine are collectively referred to as a rotating electrical machine device.

[0003] Plug-in hybrid electric vehicles and electric vehicles need to be charged with the DC power source mounted on the vehicle at various places. When charging, usually a charger is directly connected to the DC power source of the vehicle for charging. However, when the rated voltage of the DC power source of the vehicle is higher than the supply voltage of the charger, a problem occurs that charging cannot be performed from the charger to the DC power source of the vehicle. Such a problem also occurs when a high-performance vehicle having a higher-voltage DC power source appears and there is a mismatch with the specifications of the existing charging facilities.

[0004] In such a case, a technique is disclosed in which the output of a charger is boosted using the coil of a rotating electrical machine of a rotating electrical machine device, and a DC power supply is charged with the generated high voltage. A method has been proposed in which the voltage of a charger is boosted by controlling the switching element of an inverter using the coil of a rotating electrical machine having a floating neutral point, and the DC power supply is charged with a voltage higher than the voltage of the DC power supply. (For example, Patent Document 1)

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the technique disclosed in Patent Document 1, a voltage sensor for monitoring the voltage of a power conversion device of a vehicle is required. On the premise that this voltage sensor is normal, the voltage of the charger is boosted to charge the DC power supply of the vehicle. However, a method for determining an abnormality of this voltage sensor is not disclosed. To determine an abnormality of the voltage sensor, there is a method of additionally providing a voltage sensor and comparing the detection values, but this leads to an increase in the size, weight, and cost of the device.

[0007] The present disclosure has been made to solve the above problems. An object of the present disclosure is to obtain a rotating electrical machine device that enables quick determination of an abnormality of a voltage sensor at low cost while achieving downsizing and weight reduction of the rotating electrical machine device without additionally providing a dedicated voltage sensor for determining whether the voltage sensor is abnormal.

Means for Solving the Problems

[0008] The rotating electrical machine device according to the present disclosure is a positive electrode side bus connected to the positive electrode side of the DC power supply, a negative electrode side bus connected to the negative electrode side of the DC power supply, A bus voltage sensor that detects the bus voltage, which is the voltage between the positive-side bus and the negative-side bus, A positive-side switching element connected to the positive-side bus and having a positive-side diode connected in anti-parallel, a negative-side switching element connected to the negative-side bus and having a negative-side diode connected in anti-parallel, and a power conversion circuit having a plurality of legs that connect the positive-side switching element and the negative-side switching element in series and are provided with external connection points, A rotating electrical machine having a plurality of coils with one end connected to the external connection points of the power conversion circuit and the other end connected to the neutral point, A positive-side charging terminal connected to the neutral point of the rotating electrical machine via a neutral point switch, A negative-side charging terminal connected to the negative-side bus, A charging terminal voltage sensor that detects the charging terminal voltage, which is the voltage between the positive-side charging terminal and the negative-side charging terminal, and A control determination unit that controls the on / off of the positive-side switching element and the negative-side switching element of the power conversion circuit to drive the rotating electrical machine, turns on at least one of the positive-side switching elements and the neutral point switch when the rotating electrical machine is in a non-driven state, and compares the bus voltage and the charging terminal voltage to determine whether the bus voltage sensor or the charging terminal voltage sensor is abnormal.

Advantages of the Invention

[0009] According to the power conversion device according to the present disclosure, it is possible to make a determination using a voltage sensor for other purposes without adding and providing a dedicated voltage sensor to determine whether the voltage sensor is abnormal. As a result, it is possible to obtain a rotating electrical machine device that enables quick determination of voltage sensor abnormalities at low cost while achieving miniaturization and weight reduction.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0011] The power conversion device in the embodiments of the present application will be described with reference to the drawings. The drawings are schematically shown, and for the convenience of explanation, omissions or simplifications of the configuration are made. Also, the mutual relationships of the sizes and positions of the configurations shown in different drawings are not necessarily accurately described and can be changed as appropriate. In the following description, the same reference numerals are given to the same components in the drawings, and their names and functions are also assumed to be the same. Therefore, detailed descriptions of them may be omitted to avoid duplication.

[0012] 1. Embodiment 1 <Functional Blocks of the Rotating Electrical Machine Device> FIG. 1 is a functional block diagram of a rotating electrical machine device 100 according to the present disclosure. The rotating electrical machine device 100 shown in FIG. 1 is mounted on a vehicle and connected to a DC power source 1. The rotating electrical machine device 100 includes a power conversion device 2, a rotating electrical machine 3, and a switch 4. When charging the DC power source 1 of the vehicle, a charger 5 is connected to the switch 4.

[0013] The rotating electrical machine is a concept including an electric motor and a generator. The rotating electrical machine 3 connected to the power conversion device 2 according to Embodiment 1 may be read as an electric motor or a generator. The rotating electrical machine 3 having both functions of an electric motor and a generator can convert electric power into driving force for power running, and can also convert the driving force into electric power in the same structure for regenerative operation. The electric motor and the generator basically have the same structure, and both can perform power running and regenerative operation. In FIG. 1, the rotating electrical machine 3 is described as a three-phase AC rotating electrical machine, which receives power supply from the DC power source 1, i.e., +B (positive power supply) and GND (negative power supply), and supplies the U-phase, V-phase, and W-phase currents of the rotating electrical machine to drive the rotating electrical machine 3. Also, during the regenerative operation of the rotating electrical machine 3, power is supplied from the rotating electrical machine 3 to charge the DC power source 1. The rotating electrical machine 3 may use a two-phase or a rotating electrical machine having more phases than three phases.

[0014] Normally, when the vehicle is running, the charger 5 is not connected. The charger is connected when the vehicle is stopped and the power conversion device is also stopped.

[0015] As an in-vehicle system, a switch or the like called a contactor may be connected between the DC power source 1 and the power conversion device 2 of the rotating electrical machine device 100. A switch or the like may also be connected between the switch 4 and the charger 5.

[0016] In order to charge the DC power supply 1 mounted on the vehicle, the vehicle is parked at a charging station and the charger 5 is connected. When charging, the charger 5 is connected to the switch 4. By operating the power conversion device 2 and the switch 4, the current supplied from the C+ of the charger 5 is made to flow into the DC power supply 1 through the neutral point NP of the rotating electrical machine 3 for charging. When the charger 5 is not connected, power is supplied from the DC power supply 1 to the rotating electrical machine 3 via the power conversion device 2. At that time, the switch 4 is not operating and the charging terminals are open.

[0017] In FIG. 1, it is described that the power conversion device 2 receives the signal of the power supply voltage V1 output by the power supply voltage sensor 7 provided in the DC power supply 1, the signal of the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24 provided in the switch 4, and the signal of the charger voltage V4 detected by the charger voltage sensor 27 provided in the charger 5. In addition to these signals, the power conversion device 2 may receive a current signal detected by a current sensor and a temperature signal detected by a temperature sensor. Also, a control signal for controlling various switches may be output from the power conversion device 2. These signal lines are omitted in FIG. 1.

[0018] <Circuit Configuration of Rotating Electrical Machine Device> FIG. 2 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 1. FIG. 2 describes the case where the charger 5 is not connected to the rotating electrical machine device 100.

[0019] The DC power supply 1 is provided with a power supply voltage sensor 7 for detecting the voltage of the DC power supply. The signal of the power supply voltage V1 output by the power supply voltage sensor 7 is transmitted to the control determination unit 16 of the power conversion device 2. These signals may be transmitted using a direct signal line or may be transmitted by an in-vehicle communication network typified by CAN (Control Area Network) (registered trademark).

[0020] The power conversion device 2 includes a power conversion circuit 60 and a control determination unit 16. The power conversion device 2 is connected to a DC power supply 1 via a positive bus terminal 53 and a negative bus terminal 54. A bus voltage sensor 9 is connected between a positive bus 51 connected to the positive bus terminal 53 and a negative bus 52 connected to the negative bus terminal 54. The bus voltage V2 detected by the bus voltage sensor 9 is input to the control determination unit 16.

[0021] The power conversion circuit 60 includes a plurality of switching elements 10 to 15. The power conversion circuit 60 performs DC / AC power conversion. Phase currents flow through three connection lines connecting the power conversion circuit 60 and the coils 20, 21, 22 of the rotating electrical machine 3. The phase currents of the U-phase, V-phase, and W-phase are detected by phase current sensors 17, 18, 19 that detect the phase currents. Information on the current values of each phase detected by the phase current sensors 17, 18, 19 is input to the control determination unit 16.

[0022] The control determination unit 16 performs drive control to switch on and off the switching elements 10 to 15. The phase current sensors 17, 18, 19 may be provided outside the power conversion device 2. Also, the phase current sensors 17, 18, 19 may be provided inside the rotating electrical machine 3. The phase current sensors 17, 18, 19 may be current sensors using a shunt resistor, a Hall element, or the like.

[0023] <Hardware Configuration of Control Determination Unit> FIG. 3 is a hardware configuration diagram of the control determination unit 16 of the rotating electrical machine device 100 according to Embodiment 1. In the present embodiment, the control determination unit 16 is a control device that controls the power conversion device 2 of the rotating electrical machine device 100. Each function of the control determination unit 16 is realized by a processing circuit included in the control determination unit 16. Specifically, the control determination unit 16 includes, as a processing circuit, an arithmetic processing device 90 (computer) such as a CPU (Central Processing Unit), a storage device 91 that exchanges data with the arithmetic processing device 90, an input circuit 92 that inputs an external signal to the arithmetic processing device 90, and an output circuit 93 that outputs a signal from the arithmetic processing device 90 to the outside.

[0024] As the arithmetic processing unit 90, an ASIC (Application Specific Integrated Circuit), an IC (Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), various logic circuits, and various signal processing circuits may be provided. Also, as the arithmetic processing unit 90, a plurality of the same type or different types may be provided, and each process may be executed in a shared manner. As the storage device 91, a RAM (Random Access Memory) configured to be able to read and write data from the arithmetic processing unit 90, a ROM (Read Only Memory) configured to be able to read data from the arithmetic processing unit 90, and the like are provided.

[0025] The input circuit 92 receives various sensor signals and switch signals including the power supply voltage V1 signal output by the power supply voltage sensor 7, the bus voltage V2 signal output by the bus voltage sensor 9, the charging terminal voltage V3 signal output by the charging terminal voltage sensor 24, the charger voltage V4 signal output by the charger voltage sensor 27, the phase current I_pc signals output from the phase current sensors 17 to 19, the bypass current I_bp signal output by the bypass current sensor 29, the neutral point switch temperature Tswnp signal output by the neutral point switch temperature sensor 35, the bypass switch temperature Tswbp signal output by the bypass switch temperature sensor 34, the coil temperature Tcoil signals output from the coil temperature sensors 37 to 39, the positive electrode side switching element temperature Tswps signal output by the positive electrode side switching element temperature sensor 32, and the I_cc signal output by the charger current sensor 28. The input circuit 92 includes an AD conversion unit that inputs the output signals of these sensors and switches to the arithmetic processing unit 90, and an interface circuit such as an input circuit.

[0026] From the output circuit 93, switching control signals CS-SWD from the switching elements 10 to 15, bypass switch control signal CS-BP to the bypass switch 6, neutral point switch control signal CS-NP to the neutral point switch 23, power switch control signal CS-DCP to the power switch 30, charging switch control signal CS-CS to the charging switch 31, and charging current limit switch control signal CS-CL to the charging current limit switch 62 are included, and control signals to electrical loads such as switching elements and actuators are output. The output circuit 93 includes interface circuits such as a drive circuit and a communication circuit that convert and output the output signal from the arithmetic processing unit 90 to these electrical loads. Further, separately from the input circuit 92 and the output circuit 93, communication may be directly performed from the arithmetic processing unit 90 to the communication device 94.

[0027] Each function provided in the control determination unit 16 is realized by the arithmetic processing unit 90 executing software (program) stored in the storage device 91 such as a ROM and cooperating with other hardware of the control determination unit 16 such as the storage device 91, the input circuit 92, and the output circuit 93. Note that setting data such as threshold values and determination values used by the control determination unit 16 are stored in the storage device 91 such as a ROM as part of the software (program).

[0028] Each function mounted inside the control determination unit 16 may be composed of software modules, or may be composed of a combination of software and hardware.

[0029] <Power conversion device> The power conversion circuit 60 is a power conversion circuit in which six switching elements 10 to 15 are full-bridge connected. As shown in FIG. 2, the power conversion circuit 60 includes positive-side switching elements 10, 11, 12 connected to the positive-side bus 51 and having positive-side diodes connected in anti-parallel, negative-side switching elements 13, 14, 15 connected to the negative-side bus 52 and having negative-side diodes connected in anti-parallel, and external connection points that connect the positive-side switching elements and the negative-side switching elements in series and are connected to the coils of the rotating electrical machine, and has a plurality of legs provided. The switching elements 10, 13, the switching elements 11, 14, and the switching elements 12, 15 respectively constitute three sets of legs in which the positive-side (upper-stage side) switching elements and the negative-side (lower-stage side) switching elements are connected in series, and are connected in parallel between the positive-side bus 51 and the negative-side bus 52.

[0030] The midpoint of the switching elements 10, 13 is connected to the U-phase coil 20 of the rotating electrical machine 3. The midpoint of the switching elements 11, 14 is connected to the V-phase coil 21 of the rotating electrical machine 3. The midpoint of the switching elements 12, 15 is connected to the W-phase coil 22 of the rotating electrical machine 3.

[0031] The control determination unit 16 of the power conversion device 2 controls the rotating electrical machine 3 by drive control for switching on and off of the switching elements 10 to 15. Then, it performs abnormality determination of various sensors provided in the rotating electrical machine device 100.

[0032] In FIG. 2, the switching elements 10 to 15 are each a semiconductor. As shown in FIG. 2, the switching elements 10 to 15 are composed of, for example, an IGBT (Insulated Gate Bipolar Transistor) and a diode connected in antiparallel between the emitter and collector of the IGBT. Note that the type and number of the switching elements are not limited to this. In addition to the combination of an IGBT and a diode connected in reverse, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor, also referred to as MOS-FET) having a parasitic diode built in between the source and drain, a SiC-MOSFET using SiC (Silicon Carbide), etc. may be used singly or in plurality as the switching elements respectively.

[0033] In FIG. 2, the three-phase connection lines of the U phase, V phase, and W phase connected to the coils 20, 21, and 22 of the rotating electrical machine 3 have their other ends star-connected, and the neutral point is floating without being grounded. The neutral point 36 is connected to the positive electrode side charging terminal 58 via the neutral point switch 23 of the switch 4. The negative electrode side bus 52 is connected to the negative electrode side charging terminal 59 of the switch 4.

[0034] <Switch> The neutral point switch 23 of the switch 4 may use a semiconductor such as a diode or an IGBT, or a relay, etc. The on / off of the neutral point switch is controlled by the neutral point switch control signal CS-NP output by the control determination unit 16 (not shown in FIG. 2).

[0035] A neutral point switch temperature sensor 35 for detecting the temperature of the neutral point switch 23 may be provided in the neutral point switch 23 (not shown in FIG. 2). When an overcurrent flows through the neutral point switch 23 and the switch overheats, the neutral point switch 23 may be disconnected to prevent a failure. Alternatively, the current flowing through the neutral point switch 23 may be limited to prevent overheating of the neutral point switch 23.

[0036] A positive charging terminal 58 and a negative charging terminal 59 to which a charger of the switch 4 is connected are provided with a switch capacitor 25 as a measure against ripple relaxation and momentary power failure of the charger. Further, a charging terminal voltage sensor 24 is provided between the positive charging terminal 58 and the negative charging terminal 59, and the charging terminal voltage V3 is transmitted to the control determination unit 16. The charging terminal voltage V3 is a voltage supplied from the charger 5 during charging, and by comparing it with the bus voltage V2 output by the bus voltage sensor 9 of the power conversion device 2, it is possible to switch between direct charging and boost charging to charge the DC power supply 1.

[0037] Since the power conversion device 2 includes a bus voltage sensor 9 inside, the value detected by the bus voltage sensor 9 can be freely used. However, instead of the detected value of the bus voltage sensor 9, it may be possible to use the power supply voltage V1 output by the power supply voltage sensor 7 provided in the DC power supply 1.

[0038] By providing a neutral point switch 23 in the switch 4, when the rotating electrical machine 3 is in power running or regenerative running, the neutral point switch 23 can be turned off to disconnect the positive charging terminal 58 from the neutral point 36 of the rotating electrical machine 3 and the external connection point of the power conversion circuit 60 connected from the neutral point 36 via the coils 20, 21, 22. This can prevent current from flowing to the charger 5 side and suppress the occurrence of power loss due to the flow of this current.

[0039] <(When direct charging (when V2 < V3))> Consider the case of charging the DC power supply 1 of the vehicle after connecting the charger 5 with the switching elements 10 to 15 of the power conversion circuit 60 in the off state. When the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is higher than the bus voltage V2 output by the bus voltage sensor 9, a high-voltage is supplied from the positive electrode side (+C) of the charger 5. By turning on the neutral point switch 23 of the switch 4, current flows through the positive electrode side switching elements 10, 11, 12 via the coils 20, 21, 22 of the rotating electrical machine 3.

[0040] Current flows into the DC power supply 1 through the freewheeling diodes of the positive-side switching elements 10, 11, and 12, and a voltage higher than the positive side (+B) of the DC power supply 1 is applied from the positive-side bus 51, charging the DC power supply 1. At this time, charging is performed even if the positive-side switching elements 10, 11, and 12 remain off.

[0041] <Step-up charging (when V2 ≥ V3)> Consider the case where the charger 5 is connected with the switching elements 10 to 15 of the power conversion circuit 60 off, and the voltage supplied from the positive side (+C) of the charger is stepped up to charge the DC power supply 1. When the voltage V3 between the charging terminals output by the charging terminal voltage sensor 24 is less than or equal to the bus voltage V2 output by the bus voltage sensor 9, the DC power supply 1 cannot be directly charged with the voltage on the positive side (+C) of the charger 5.

[0042] In that case, the neutral point switch 23 of the switch 4 is turned on. Then, by turning on at least one of the negative-side switching elements 13, 14, and 15, current flows through the coil of the rotating electrical machine and magnetic energy is stored. Next, when the negative-side switching element is turned off, the voltage on the positive side (+C) of the charger 5 boosted by the magnetic energy stored in the coil of the rotating electrical machine is applied to the positive-side bus through the freewheeling diode of the corresponding leg's positive-side switching element. The voltage on the positive side (+C) of the charger 5 is stepped up and current flows into the positive-side bus. By repeating the on / off operation of the negative-side switching element, the supply voltage C+ of the charger is stepped up, a voltage higher than the positive side (+B) of the DC power supply 1 is applied from the positive-side bus 51, current flows in, and the DC power supply 1 is charged.

[0043] <Abnormality determination of the bus voltage sensor> As described above, the bus voltage sensor 9 that detects the bus voltage V2 output by the bus voltage sensor 9 is an important component for determining the charging method. The above control is implemented on the premise that the bus voltage sensor 9 is normal. Therefore, it is important to determine whether there is an abnormality in the bus voltage sensor 9.

[0044] When the rotating electrical machine 3 is in a non-driven state, the control determination unit 16 turns on at least one of the positive electrode side switching elements 10 to 12 and the neutral point switch 23. Then, the control determination unit 16 compares the bus voltage V2 output by the bus voltage sensor 9 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24. If the two voltages are substantially equal, it can be determined that the bus voltage sensor 9 and the charging terminal voltage sensor 24 are normal, and it can be confirmed that the reliability is high. If the two voltages are significantly different, it can be determined that the bus voltage sensor 9 or the charging terminal voltage sensor 24 is abnormal.

[0045] When the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is higher than the bus voltage V2 output by the bus voltage sensor 9, the charge applied to the switch capacitor 25 passes through the neutral point switch 23 and the coil of the rotating electrical machine 3, and then passes through the anti-parallel diodes of the positive electrode side switching elements 10, 11, and 12 of the power conversion circuit 60 and flows to the positive electrode side bus. As a result, the bus voltage V2 output by the bus voltage sensor 9 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 become substantially the same voltage.

[0046] When the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is less than or equal to the bus voltage V2 output by the bus voltage sensor 9, the switch capacitor 25 is charged from the positive electrode side bus 51 through one of the turned-on positive electrode side switching elements, then through the coil of the rotating electrical machine 3, the neutral point 36, and the neutral point switch 23. Therefore, the bus voltage V2 output by the bus voltage sensor 9 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 become substantially the same voltage.

[0047] <Comparison between V2 and V3> In a state where the rotating electrical machine 3 is not driven, the control determination unit 16 turns on at least one of the positive electrode side switching elements 10 to 12 and the neutral point switch 23. When the absolute value of the difference between the charging terminal voltage V3 output by the charging terminal voltage sensor 24 and the bus voltage V2 output by the bus voltage sensor 9 is equal to or greater than a predetermined voltage difference abnormal determination value ΔVf (the voltage difference abnormal determination value ΔVf is not shown), it can be determined that the bus voltage sensor 9 or the charging terminal voltage sensor 24 is abnormal. Conversely, when the absolute value of the difference between the bus voltage V2 output by the bus voltage sensor 9 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is smaller than the voltage difference abnormal determination value ΔVf, the bus voltage sensor 9 and the charging terminal voltage sensor 24 may be determined to be normal.

[0048] <Monitoring of phase current> Also, it is conceivable that a difference occurs in the output of each voltage sensor until the current flows through the switching element, the coil of the rotating electrical machine 3, and the neutral point switch 23 and balances. Therefore, after the phase current Ip_c detected by the phase current sensors 17, 18, and 19 becomes equal to or less than a predetermined phase current stop determination value Is_pc (the phase current stop determination value Is_pc is not shown), the bus voltage V2 output by the bus voltage sensor 9 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 may be compared.

[0049] <Comparison of V1, V2, and V3> Here, instead of the bus voltage V2 output by the bus voltage sensor 9, the power supply voltage V1 output by the power supply voltage sensor 7 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 may be compared to determine the presence or absence of an abnormality. By obtaining the power supply voltage V1 of the power supply voltage sensor 7 provided in the DC power supply 1, the control determination unit 16 can also determine which of the power supply voltage V1, the bus voltage V2, and the charging terminal voltage V3 is abnormal. In addition, the comparison between the power supply voltage V1 and the bus voltage V2 can be performed at all times. Therefore, when the absolute value of the difference between the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 is less than the power supply voltage difference determination value ΔVbm (the power supply voltage difference determination value ΔVbm is not shown), the power supply voltage sensor 7 and the bus voltage sensor 9 can be determined to be normal. When the absolute value of the difference between the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 is equal to or greater than the power supply voltage difference determination value ΔVbm, the presence or absence of an abnormality in the power supply voltage sensor 7 or the bus voltage sensor 9 may be determined by the above procedure.

[0050] Regarding the three types of voltage sensors, if the absolute value of the difference in voltage values of a plurality of sensors is within a predetermined range (for example, less than the voltage difference abnormality determination value ΔVf), and the voltage value of another one sensor is outside the predetermined range, it can be specified that the sensor that outputs the voltage within the predetermined range is normal and the sensor that shows the deviated value is abnormal.

[0051] It is possible to make a determination using voltage sensors for other purposes without adding and providing a dedicated voltage sensor to determine whether the voltage sensor is abnormal. As a result, it is possible to obtain a rotating electrical machine device that enables quick determination of voltage sensor abnormalities at low cost while achieving miniaturization and weight reduction. Also here, when the voltage values output by the three types of sensors are discrete from each other, abnormalities of at least two types of sensors can be assumed. At this time, all three types of sensors may be determined to be abnormal.

[0052] Even when comparing three types of voltage sensors, a difference may occur in the outputs of the respective voltage sensors until the current flows through the switching element, the coil of the rotating electric machine 3, and the neutral point switch 23 and balances. Therefore, after the phase currents I_pc detected by the phase current sensors 17, 18, and 19 become equal to or less than a predetermined phase current stop determination value Is_pc, the power supply voltage V1 output by the power supply voltage sensor 7, the bus voltage V2 output by the bus voltage sensor 9, and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 may be compared.

[0053] <Use of MOS-FET> The switching elements 10 to 15 of the power conversion circuit 60 shown in FIG. 2 show an example using IGBTs. When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is lower than the charging terminal voltage V3 output by the charging terminal voltage sensor 24, the neutral point switch 23 of the switch 4 is turned on, and a voltage is applied to the gate of one or more phases of the positive-side switching elements 10 to 12 of the power conversion circuit 60 to drive and control the switching elements, so that the current flows in the direction of the DC power supply 1.

[0054] At this time, if the switching element is a MOS-FET, it is possible to make the current flow not through the body diode but through the switching element body with low on-resistance. Since the IGBT with a bipolar structure has a PN junction formed in the direction from the collector to the emitter, even when a voltage is applied to the gate, the current cannot flow through the IGBT body. At this time, the current flows through the body diode.

[0055] Therefore, by using a MOS-FET instead of an IGBT, the current can flow through the bodies of the positive-side switching elements 10 to 12 with low on-resistance instead of the body diodes. As a result, the variation in the threshold value for abnormality determination can be reduced. Considering the variations in the detection values of the power supply voltage sensor 7, the bus voltage sensor 9, and the charging terminal voltage sensor 24, and the errors due to the accuracy of the voltage sensors, a voltage difference abnormality determination value ΔVf is set. Therefore, reducing the variation in the threshold value contributes to improving the accuracy of abnormality determination.

[0056] 2. Embodiment 2 <Bypass Switch> FIG. 4 is a functional block diagram of the rotating electrical machine device 100 according to Embodiment 2. FIG. 5 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 2. The rotating electrical machine device 100 according to Embodiment 2 is different from the rotating electrical machine device 100 according to Embodiment 1 in that it is connected from the positive electrode side charging terminal 58 of the switch 4 to the positive electrode side bus 51 of the power conversion device 2 via a bypass switch 6.

[0057] The bypass switch 6 may be formed of a semiconductor such as a diode or IGBT, or a relay. The on / off state of the bypass switch 6 is controlled by a bypass switch control signal CS-BP output from the control determination unit 16 (not shown in FIG. 5).

[0058] <Bypass Switch Temperature> The bypass switch 6 may be provided with a bypass switch temperature sensor 34 for detecting the temperature of the bypass switch 6 (the bypass switch temperature sensor 34 is not shown in FIG. 5). When an overcurrent flows through the bypass switch 6 and the switch overheats, the bypass switch 6 may be disconnected to prevent a failure. Alternatively, the current flowing through the bypass switch 6 may be limited to prevent overheating of the bypass switch 6.

[0059] In the rotating electrical machine device 100 according to Embodiment 2, consider the case where a deviation occurs between the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 which is the detected value of the bus voltage sensor 9. The power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 are often physically separated from the control determination unit 16 of the rotating electrical machine device 100, but they are the same in that they are both on the power supply side of the power conversion device 2, and their voltage behaviors also well match.

[0060] Therefore, the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 may be compared as detection values of the same type to determine whether abnormal detection is necessary. When the absolute value of the difference between the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 is greater than the power supply voltage difference determination value ΔVbm, it is considered that there is a deviation between the detection value of the power supply voltage sensor 7 and the detection value of the bus voltage sensor 9, and the abnormal determination procedure may be carried out.

[0061] Here, as a procedure for abnormal determination, the bypass switch 6 that is normally off is turned on. As a result, the positive charging terminal 58 of the switch 4 and the positive bus 51 of the power conversion device 2 are connected. And the bus voltage V2 which is the detection value of the bus voltage sensor 9 and the charging terminal voltage V3 which is the detection value of the charging terminal voltage sensor 24 should be the same. At this time, the power supply voltage V1 output by the power supply voltage sensor 7, the bus voltage V2, and the charging terminal voltage V3 are compared to perform abnormal determination.

[0062] Consider the case where there is a deviation between the power supply voltage V1 which is the detection value of the power supply voltage sensor 7 and the bus voltage V2 which is the detection value of the bus voltage sensor 9, and the power supply voltage V1 < the charging terminal voltage V3. At this time, when the bypass switch 6 is turned on, the switch capacitor 25 is discharged toward the DC power supply 1 until the power supply voltage V1 of the DC power supply 1 matches the voltage of the switch capacitor 25.

[0063] On the other hand, when the power supply voltage V1 ≥ the charging terminal voltage V3, when the bypass switch 6 is turned on, the switch capacitor 25 is charged from the DC power supply 1 until the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 matches the charging terminal voltage V3 output by the charging terminal voltage sensor 24 of the switch 4. Eventually, when the charging terminal voltage V3 of the charging terminal voltage sensor 24 which is normal becomes constant at a certain voltage, it means that the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 of the switch capacitor 25 match.

[0064] Therefore, the detected values of the charging terminal voltage sensor 24 and the power supply voltage sensor 7 or the bus voltage sensor 9 (it is also possible to compare with both the power supply voltage sensor and the bus voltage sensor) are compared. By doing so, if the absolute value of the difference in the detected value of the charging terminal voltage sensor 24 is within a predetermined range (for example, less than the voltage difference abnormality determination value ΔVf), it can be determined as normal. And if it is outside the predetermined range, it can be determined as a failure.

[0065] When determining the abnormality of each voltage sensor, the charging path to the DC power supply 1 or the capacitor 25 of the switch is made to pass through the bypass switch 6. By doing so, compared with the case of flowing current through the neutral point switch 23, the coils 20 to 22, and the switching element, the resistance value of the energization path is small and the voltage drop is also small, so there is an effect of suppressing the heat generation of the power conversion device 2 and the rotating electrical machine 3.

[0066] 3. Embodiment 3 <Connection of Charger> FIG. 6 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 3. In Embodiment 3, the rotating electrical machine device 100 when the charger 5 is connected will be described. As the functional block diagram of the rotating electrical machine device 100 according to Embodiment 3, FIG. 1 can be applied.

[0067] The charger 5 is provided with a diode as the current backflow prevention device 26. When current flows from the DC power supply 1 of the vehicle into the charger 5, the DC power supply 1 discharges and the travelable distance is shortened. Also, there is a possibility of causing deterioration of the charger 5 and the DC power supply 1 due to a large current in an unexpected direction.

[0068] Here, the backflow prevention device 26 is not limited to a diode. As a backflow prevention device using a semiconductor, a device that shuts off between the switch 4 and the charger 5 when a backflow is detected by a current sensor may be used. The charger 5 is provided with a charger voltage sensor 27 that detects the charger voltage V4, which is the voltage of the power supply supplied by the charger 5, and a charger current sensor 28 that detects the charger current I_cc (not shown) supplied by the charger 5.

[0069] <Selection of Charging Method> When the charger 5 is connected, the neutral point switch 23 of the switch 4 is turned on by the neutral point switch control signal CS-NP (not shown) output by the control determination unit 16. Then, the magnitude relationship between the bus voltage V2, which is the detection value of the bus voltage sensor 9 (the power supply voltage V1, which is the detection value of the power supply voltage sensor 7, may also be used), and the charging terminal voltage V3, which is the detection value of the charging terminal voltage sensor 24, is confirmed.

[0070] This is to determine the necessity of boosting using the coils 20 to 22 of the rotating electrical machine 3 as a charging method for the DC power supply 1. If the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is higher than the bus voltage V2 output by the bus voltage sensor 9, charging can be performed without boosting. If the charging terminal voltage V3 output by the charging terminal voltage sensor 24 is less than or equal to the bus voltage V2 output by the bus voltage sensor 9, the DC power supply 1 cannot be charged without boosting.

[0071] When boosting is required, at least one of the negative side switching elements 13, 14, and 15 of the power conversion device 2 is turned on, causing current to flow through the coil of the rotating electrical machine 3 and magnetic energy to be stored. Next, when the negative side switching element is turned off, the voltage on the positive side (+C) of the charger 5 boosted by the magnetic energy stored in the coil of the rotating electrical machine 3 is applied to the positive side bus 51 through the anti-parallel diode of the corresponding leg's positive side switching element. By turning on and off the negative side switching elements 13, 14, and 15 at a predetermined cycle, the DC power supply 1 can be charged.

[0072] <Deviation between V1 and V2> As the voltage behavior on the DC power supply side, it may also be possible to compare the power supply voltage V1 and the bus voltage V2 output by the bus voltage sensor 9 as the same type of detection value to determine the necessity of abnormal detection. For example, when the absolute value of the difference between the power supply voltage V1 and the bus voltage V2 output by the bus voltage sensor 9 is greater than or equal to a predetermined power supply voltage difference determination value ΔVbm, it may be considered that there is a deviation in the detection value, and abnormal determination procedures may be implemented.

[0073] Here, similar to Embodiment 1, if either the power supply voltage sensor 7 or the bus voltage sensor 9 malfunctions and there is a deviation between the detected value of the power supply voltage sensor 7 and the detected value of the bus voltage sensor 9, the voltage relationship between the DC power supply 1 and the charger 5 becomes unclear and the charging operation becomes unstable. In that case, the charging operation by the switching elements 10 to 15 is stopped (the neutral point switch 23 of the switch 4 may also be turned off). At this point, it is unknown which of the power supply voltage sensor 7 or the bus voltage sensor 9 is malfunctioning.

[0074] <When V1 ≤ V4> When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is less than or equal to the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, if the neutral point switch 23 of the switch 4 is turned on, current flows through the coil of the rotating electrical machine 3 and the positive side switching elements 10 to 12 of the power conversion device. At this time, even if one or more phases of the positive side switching elements 10 to 12 of the power conversion device are not driven and controlled, current flows through the body diode and is charged to the DC power supply 1 via the positive bus 51.

[0075] At this time, the phase current sensors 17 to 19 indicate the value of the charging current flowing from the charger 5 to the DC power supply 1. Eventually, the DC power supply 1 is charged and the power supply voltage V1 of the DC power supply 1 and the charger voltage V4 of the charger 5 will be balanced. When the power supply voltage V1 and the charger voltage V4 are balanced, the detected values of the phase current sensors 17 to 19 become zero, and the power supply voltage V1 and the charger voltage V4 become almost equal.

[0076] Here, the charging terminal voltage V3 output by the charging terminal voltage sensor 24 shows the same behavior as the charger voltage V4 output by the charger voltage sensor 27. When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charger voltage V4 output by the charger voltage sensor 27 of the charger 5 are balanced, the charging terminal voltage V3, which is the detected value of the charging terminal voltage sensor 24, becomes almost equal to the power supply voltage V1, which is the detected value of the power supply voltage sensor 7, and the bus voltage V2, which is the detected value of the bus voltage sensor 9.

[0077] When the detected values of the phase current sensors 17 to 19 become zero, compare the detected values of the power supply voltage sensor 7, the bus voltage sensor 9, and the voltage sensor 24 between the charging terminals. (It is also acceptable to compare the detected value of the voltage sensor 24 between the charging terminals with the detected value of the power supply voltage sensor 7, or to compare the detected value of the voltage sensor 24 between the charging terminals with the detected value of the bus voltage sensor 9. In this case, instead of the voltage sensor 24 between the charging terminals, it may be compared with the charger voltage sensor 27.)

[0078] At this time, if the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 are approximately the same voltage values as the detected value of the voltage sensor 24 between the charging terminals respectively, it can be judged as normal, and if they are different voltage values from the detected value of the voltage sensor 24 between the charging terminals respectively, it can be judged as a failure. In this way, it becomes possible to identify the faulty voltage sensor among the power supply voltage sensor 7 and the bus voltage sensor 9.

[0079] Also, if the charging of the DC power supply 1 is completed, the power supply voltage V1 output by the power supply voltage sensor 7, the bus voltage V2 output by the bus voltage sensor 9, the voltage V3 between the charging terminals output by the voltage sensor 24 between the charging terminals, and the charger voltage V4 output by the charger voltage sensor 27 should all be approximately equal. In that case, even if the power supply voltage V1 and the bus voltage V2 output by the bus voltage sensor 9 do not deviate, it is possible to identify the sensor that detects a voltage significantly different from the others and determine it as abnormal.

[0080] <v1>In the case of V4> When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, if the neutral point switch 23 of the switch 4 is on and any one or more phases from the positive side switching elements 10 to 12 of the power conversion device 2 are driven and controlled, the DC power supply 1 charges the switch capacitor 25. At this time, since the charger 5 is provided with a reverse current prevention device 26, no current flows toward the charger 5.

[0081] Eventually, the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charging terminal voltage V3 output by the charging terminal voltage sensor 24 applied between the charging terminals of the switch capacitor 25 will balance. The charging terminal voltage V3, which is the detected value of the charging terminal voltage sensor 24, stabilizes at a certain voltage value and becomes approximately equal to the normal value of the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 of the bus voltage sensor 9.

[0082] Compare the power supply voltage V1 of the power supply voltage sensor 7, the bus voltage V2 of the bus voltage sensor 9, and the charging terminal voltage V3 of the charging terminal voltage sensor 24. If the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 are respectively approximately the same voltage value (the absolute value of the voltage difference is less than the voltage difference abnormal determination value ΔVf) as the charging terminal voltage V3 of the charging terminal voltage sensor 24, it can be determined as normal. If the power supply voltage V1 output by the power supply voltage sensor 7 and the bus voltage V2 output by the bus voltage sensor 9 are respectively significantly different (the absolute value of the voltage difference is greater than or equal to the voltage difference abnormal determination value ΔVf) from the charging terminal voltage V3 of the charging terminal voltage sensor 24, it can be determined as abnormal. (Either when comparing the detected values of the charging terminal voltage sensor 24 and the power supply voltage sensor 7 or when comparing the detected values of the charging terminal voltage sensor 24 and the bus voltage sensor 9 is acceptable)

[0083] When the power supply voltage V1 of the DC power supply 1 is equal to the voltage V3 across the charging terminals output by the charging terminal voltage sensor 24 applied to the switch capacitor 25, the power supply voltage V1 output by the power supply voltage sensor 7, the bus voltage V2 output by the bus voltage sensor 9, and the voltage V3 across the charging terminals should originally have substantially equal values. Regardless of the deviation between the power supply voltage V1 and the bus voltage V2, by comparing the outputs of the three types of voltage sensors, a sensor that detects substantially equal voltage values can be determined to be normal, and a sensor that detects significantly different voltage values can be determined to be abnormal. If the detected values of all three types of sensors are discrete, it may be determined that all are abnormal.

[0084] <Deviation between V3 and V4> If the charger 5 is not provided with the reverse current prevention device 26, the voltage V3 across the charging terminals output by the charging terminal voltage sensor 24, together with the charger voltage V4 output by the charger voltage sensor 27, indicates the voltage behavior on the charger side. Therefore, it may be possible to compare the voltage V3 across the charging terminals and the charger voltage V4 as detection values of the same type to determine the necessity of abnormal detection. For example, when the absolute value of the difference between the voltage V3 across the charging terminals and the charger voltage V4 is equal to or greater than a predetermined charging voltage difference determination value ΔVcs, it may be considered that there is a deviation in the detected values, and abnormal determination procedures may be implemented (the charging voltage difference determination value ΔVcs is not shown). If the absolute value of the difference between the voltage V3 across the charging terminals and the charger voltage V4 is less than the charging voltage difference determination value ΔVcs, the voltage V3 across the charging terminals and the charger voltage V4 can be determined to be normal. The charging voltage difference determination value ΔVcs needs to be set considering the voltage drop caused by the reverse current prevention device 26.

[0085] Considering that the charger 5 is provided with the reverse current prevention device 26, even if the charger voltage V4 output by the charger voltage sensor 27 takes a value lower than the voltage V3 across the charging terminals output by the charging terminal voltage sensor 24, it is not considered abnormal. Therefore, when the charger voltage V4 is equal to or greater than the sum of the voltage V3 across the charging terminals and the charging voltage difference determination value ΔVcs, it may be considered that there is a deviation in the detected values, and abnormal determination procedures may be implemented.

[0086] Even when the charger 5 is provided with the backflow prevention device 26, generally, the inter-charging terminal voltage V3 output by the inter-charging terminal voltage sensor 24 indicates substantially the same voltage as the charger voltage V4 output by the charger voltage sensor 27. The inter-charging terminal voltage V3 is a voltage that has decreased by the voltage drop of the backflow prevention device 26 from the charger voltage V4.

[0087] Consider the case where the neutral point switch 23 of the switch 4 is off and the charger 5 is connected. Even in such a case, when the power conversion circuit 60 is not operating, the neutral point switch 23 can be turned on, and the charge of the switch capacitor 25 can be discharged by temporarily turning on any one of the negative-side switching elements 13 to 15. Thereafter, if the inter-charging terminal voltage V3 is lower than the charger voltage V4 due to the turning off of the switching element or the turning off of the neutral point switch 23, a current flows into the switch capacitor 25 from the charger 5 via the backflow prevention device 26. Then, the inter-charging terminal voltage V3 becomes substantially the same voltage as the charger voltage V4. Even when such an operation is performed, if the absolute value of the difference between the inter-charging terminal voltage V3 and the charger voltage V4 is equal to or greater than the charging voltage difference determination value ΔVcs, it is determined that there is a deviation between V3 and V4.

[0088] <When V1 ≤ V4> Hereinafter, consider the case where the inter-charging terminal voltage V3 and the charger voltage V4 deviate from each other and the charger voltage V4 is equal to or higher than the power supply voltage V1. When the charger 5 is connected, since the switch capacitor 25 is charged, if both the inter-charging terminal voltage V3, which is the detected value of the inter-charging terminal voltage sensor 24, and the charger voltage V4 output by the charger voltage sensor 27 are normal, they will have substantially the same voltage value. If either the inter-charging terminal voltage sensor 24 or the charger voltage sensor 27 malfunctions and a deviation occurs in the detected value, the voltage relationship between the DC power supply 1 and the charger 5 becomes unclear and the charging operation becomes unstable.

[0089] Therefore, when there is a deviation between the inter-charging terminal voltage V3 output by the inter-charging terminal voltage sensor 24 and the charger voltage V4 output by the charger voltage sensor 27, the charging operation by the switching elements 10 to 15 is stopped. (The neutral point switch 23 of the switch 4 may also be turned off.)

[0090] When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is less than or equal to the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, by turning on the neutral point switch 23 of the switch 4, current flows to the positive bus through the body diodes of the positive side switching elements 10 to 12 of the power conversion device 2. The charger 5 charges the DC power supply 1. In this case, in order to unify the procedure for abnormality detection, there is no particular problem even if the neutral point switch 23 of the switch 4 is turned on and one or more phases of the positive side switching elements 10 to 12 of the power conversion device 2 are driven and controlled.

[0091] Eventually, the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charger voltage V4 output by the charger voltage sensor 27 of the charger 5 are balanced (the same applies to the inter-charging terminal voltage V3 of the switch capacitor 25). Then, the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 settle at a certain voltage value. At that point, if the inter-charging terminal voltage V3 detected by the inter-charging terminal voltage sensor 24 and the charger voltage V4 detected by the charger voltage sensor 27 are normal, they will be approximately the same voltage value as the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9.

[0092] At present, since the voltage V3 between the charging terminals and the charger voltage V4 deviate from each other, the power supply voltage V1 detected by the power supply voltage sensor 7 or the bus voltage V2 detected by the bus voltage sensor 9 is compared with the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24. (Comparing with the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24 may be both the power supply voltage V1 detected by the power supply voltage sensor 7 and the bus voltage V2 detected by the bus voltage sensor 9. Also, it may be compared with one or both of the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24 and the charger voltage V4 detected by the charger voltage sensor 27). If the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24 is approximately the same as the power supply voltage V1 detected by the power supply voltage sensor 7 or the bus voltage V2 detected by the bus voltage sensor 9, it can be determined that the charger voltage sensor 27 is abnormal and the charging terminal voltage sensor 24 is normal. If the voltage V3 between the charging terminals detected by the charging terminal voltage sensor 24 is significantly different from the power supply voltage V1 detected by the power supply voltage sensor 7 or the bus voltage V2 detected by the bus voltage sensor 9, it can be determined that the charging terminal voltage sensor 24 is abnormal.

[0093] <v1>In the case of V4> On the other hand, when the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, the neutral point switch 23 of the switch 4 is turned on, and one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device 2 are driven and controlled. Then, the DC power supply 1 charges the switch capacitor 25.

[0094] At this time, since the charger 5 is equipped with the reverse current prevention device 26, no current flows toward the charger 5. Eventually, the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charging terminal voltage V3 applied to the switch capacitor 25 are balanced. The power supply voltage V1 detected by the power supply voltage sensor 7 and the bus voltage V2 detected by the bus voltage sensor 9 settle at a certain voltage value.

[0095] At that point, the power supply voltage V1 detected by the power supply voltage sensor 7, the bus voltage V2 detected by the bus voltage sensor 9, and the charging terminal voltage V3 detected by the charging terminal voltage sensor 24 are compared (it is also possible to compare the charging terminal voltage V3 detected by the charging terminal voltage sensor 24 with the power supply voltage V1 value detected by the power supply voltage sensor 7, or to compare the charging terminal voltage V3 detected by the charging terminal voltage sensor 24 with the bus voltage V2 detected by the bus voltage sensor 9). If the charging terminal voltage V3 detected by the charging terminal voltage sensor 24 is approximately the same as the power supply voltage V1 detected by the power supply voltage sensor 7 and the bus voltage V2 detected by the bus voltage sensor 9 (the absolute value of the voltage difference is less than the voltage difference abnormal determination value ΔVf), it can be determined that the charger voltage sensor 27 is faulty and the charging terminal voltage sensor 24 is normal. If the charging terminal voltage V3 detected by the charging terminal voltage sensor 24 is significantly different from the power supply voltage V1 detected by the power supply voltage sensor 7 and the bus voltage V2 detected by the bus voltage sensor 9 (the absolute value of the voltage difference is greater than or equal to the voltage difference abnormal determination value ΔVf), it can be determined that the charging terminal voltage sensor 24 is faulty.

[0096] 4. Embodiment 4 <Connection between charger and bypass switch> FIG. 7 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 4. The rotating electrical machine device 100 described in FIG. 5 according to Embodiment 2 is shown in a state of being connected to the charger 5. As the functional block diagram of the rotating electrical machine device 100, FIG. 4 can be applied.

[0097] In FIG. 7, a bypass switch 6 is provided between the positive electrode side bus bar 51 of the power conversion device 2 and the positive electrode side charging terminal 58 of the switch 4 in the configuration of FIG. 6 according to Embodiment 3. Further, a charger current sensor 28 is added in the charger 5, which is a configuration example.

[0098] When the charger 5 is connected, the magnitude relationship between the detection values of the bus voltage sensor 9 (the power supply voltage sensor 7 may also be used) and the charging terminal voltage sensor 24 is confirmed. Then, it is determined whether to charge the DC power supply 1 via the neutral point switch 23 of the power conversion device 2 and the switch 4, or to charge the DC power supply 1 via the bypass switch 6.

[0099] <When V1 < V4> When either the power supply voltage sensor 7 or the bus voltage sensor 9 fails, the operation via the bypass switch 6 will be described. Consider the case where the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is lower than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, and the bypass switch 6 is turned on. At this point, it is unknown which of the power supply voltage sensor 7 and the bus voltage sensor 9 has failed.

[0100] Therefore, it is unknown when the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charger voltage V4 output by the charger voltage sensor 27 of the charger 5 (the charging terminal voltage V3 applied to the switch capacitor 25 may also be used) will balance. Thus, the charger current sensor 28 is utilized. When charging of the DC power supply 1 is started, the detected value of the charger current sensor 28 indicates the value of the charging current from the charger 5 to the DC power supply 1.

[0101] Eventually, the power supply voltage V1, which is the output of the power supply voltage sensor 7 of the DC power supply 1, and the charger voltage V4, which is the output of the charger voltage sensor 27 of the charger 5 (it may also be the charging terminal voltage V3 applied to the switch capacitor 25), are balanced, and the detected value of the charger current sensor 28 becomes zero. At this point, the detected values of the power supply voltage sensor 7, the bus voltage sensor 9, and the charging terminal voltage sensor 24 can be compared. (It is also possible to compare the detected values of the charging terminal voltage sensor 24 and the power supply voltage sensor 7, or to compare the detected values of the charging terminal voltage sensor 24 and the bus voltage sensor 9. In this case, it is also possible to compare with both the charging terminal voltage sensor 24 and the charger voltage sensor 27) If the voltage is approximately the same as the detected value of the charging terminal voltage sensor 24 (the absolute value of the difference is less than the voltage difference abnormal determination value ΔVf), it can be determined as normal, and if the voltage is significantly different from the detected value of the charging terminal voltage sensor 24 (the absolute value of the difference is greater than or equal to the voltage difference abnormal determination value ΔVf), it can be determined as a failure.

[0102] When the power supply voltage V1, which is the output of the power supply voltage sensor 7 of the DC power supply 1, is lower than the charger voltage V4, which is the output of the charger voltage sensor 27 of the charger 5, even if either the power supply voltage sensor 7 or the bus voltage sensor 9 fails, when the bypass switch 6 is turned on, by using the charger current sensor 28, it is possible to confirm the end of the charging current from the charger 5 to the DC power supply 1.

[0103] <v1>In the case of V4> On the other hand, when the power supply voltage V1, which is the output of the power supply voltage sensor 7 of the DC power supply 1, is higher than the charger voltage V4, which is the output of the charger voltage sensor 27 of the charger 5, when the bypass switch 6 is turned on, the DC power supply 1 charges the switch capacitor 25. At this time, since the charger 5 is equipped with a reverse current prevention device 26, no current flows toward the charger 5, so the detected value of the charger current sensor 28 becomes zero.

[0104] Eventually, when the power supply voltage V1, which is the output of the power supply voltage sensor 7 of the DC power supply 1, and the voltage V3 between the charging terminals, which is the output of the voltage sensor 24 between the charging terminals of the switch capacitor 25, are balanced, the detected value of the voltage sensor 24 between the charging terminals stabilizes at a certain voltage value and becomes equal to the normal values of the power supply voltage sensor 7 and the bus voltage sensor 9. The detected values of the power supply voltage sensor 7, the bus voltage sensor 9, and the voltage sensor 24 between the charging terminals can be compared. (It is possible to compare the detected values of the voltage sensor 24 between the charging terminals and the power supply voltage sensor 7, or the detected values of the voltage sensor 24 between the charging terminals and the bus voltage sensor 9.) Then, if the voltage value is approximately the same as the detected value of the voltage sensor 24 between the charging terminals, it can be determined as normal, and if it is a voltage sensor different from the detected value of the voltage sensor 24 between the charging terminals, it can be determined as a failure.

[0105] The operation via the bypass switch 6 in the case where either the voltage sensor 24 between the charging terminals or the charger voltage sensor 27 fails will be described. When the power supply voltage V1, which is the output of the power supply voltage sensor 7 of the DC power supply 1, is lower than the charger voltage V4, which is the output of the charger voltage sensor 27 of the charger 5, and the bypass switch 6 is on, the DC power supply 1 is charged.

[0106] Eventually, when the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 and the charger voltage V4 which is the output of the charger voltage sensor 27 of the charger 5 (it may also be the voltage V3 between the charging terminals which is the output of the voltage sensor 24 between the charging terminals of the switch capacitor 25) are balanced, the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 will stabilize at a certain voltage value. At that point, if the voltage sensor 24 between the charging terminals and the charger voltage sensor 27 are normal, the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 will be approximately the same value.

[0107] <Comparison of V1, V2, and V3> From this, compare the detected values of the power supply voltage sensor 7, the bus voltage sensor 9, and the voltage sensor 24 between the charging terminals (it is also possible to compare the detected values of the voltage sensor 24 between the charging terminals and the power supply voltage sensor 7, or compare the detected values of the voltage sensor 24 between the charging terminals and the bus voltage sensor 9. In this case, it is also possible to compare with both the voltage sensor 24 between the charging terminals and the charger voltage sensor 27).

[0108] If the voltage sensor 24 between the charging terminals is the same as the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9, it can be determined that the charger voltage sensor 27 is faulty. If the voltage sensor 24 between the charging terminals is significantly different from the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9, it can be determined that the voltage sensor 24 between the charging terminals is faulty.

[0109] On the other hand, when the power supply voltage V1 which is the detected value of the power supply voltage sensor 7 of the DC power supply 1 is higher than the charger voltage V4 which is the detected value of the charger voltage sensor 27 of the charger 5 and the bypass switch 6 is on, the switch capacitor 25 is charged from the DC power supply 1. At this time, since the charger 5 is equipped with a reverse current prevention device 26, no current flows towards the charger 5.

[0110] Therefore, the detected value of the charger current sensor 28 becomes zero. Eventually, when the power supply voltage V1, which is the detected value of the power supply voltage sensor 7 of the DC power supply 1, matches the voltage V3 between the charging terminals of the switch capacitor 25, the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 settle at a certain voltage value. At that point, the detected values of the power supply voltage sensor 7, the bus voltage sensor 9, and the voltage sensor 24 between the charging terminals are compared (it is also possible to compare the detected value of the voltage sensor 24 between the charging terminals with the detected value of the power supply voltage sensor 7, or to compare the detected value of the voltage sensor 24 between the charging terminals with the detected value of the bus voltage sensor 9).

[0111] If the voltage sensor 24 between the charging terminals is the same as the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9, it can be determined that the charger voltage sensor 27 is faulty. If the voltage sensor 24 between the charging terminals is different from the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9, it can be determined that the voltage sensor 24 between the charging terminals is faulty.

[0112] As described above, the cases of the current paths of the neutral point switch 23 and the bypass switch 6 of the switch have been explained respectively. By providing temperature sensors on the neutral point switch 23 and the bypass switch 6 of the switch 4, it becomes possible to turn on only the switches with sufficient thermal margin and select the current path. Temperature sensors may also be provided on the switching elements 10 to 15 of the power conversion device 2, the rotating electrical machine 3, and the coils 20 to 22 of the rotating electrical machine 3. It may also be possible to select and use the phase with sufficient margin (the lowest temperature) in the temperature states of the U-phase, V-phase, and W-phase of the switching element. It may also be possible to comprehensively select a current path with sufficient thermal margin including the temperature sensors of the neutral point switch 23 and the bypass switch 6 of the switch 4.

[0113] 5. Embodiment 5 <Bus capacitor> FIG. 8 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 5. FIG. 8 according to Embodiment 5 is a configuration example in which a bus capacitor 8 connected in parallel with the bus voltage sensor 9 is added to FIG. 7 according to Embodiment 4.

[0114] When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, as seen from the switch capacitor 25, the bus capacitor 8 is regarded as a voltage source including the DC power supply 1. On the other hand, when the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is lower than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5, as seen from the charger 5, the bus capacitor 8 can be regarded as a load to be charged.

[0115] Therefore, to show the influence of the bus capacitor 8, it will be described using FIG. 7 in which the bus capacitor 8 is added. The operation when either the charging terminal voltage sensor 24 or the charger voltage sensor 27 fails and the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is lower than the charger voltage V4 output by the charger voltage sensor 27 of the charger 5 will be described.

[0116] When either the charging terminal voltage sensor 24 or the charger voltage sensor 27 fails, the neutral point switch 23 of the switch 4 is turned on. Then, one or more phases from the positive side switching elements 10 to 12 of the power conversion device 2 are driven and controlled (even if the positive side switching elements 10 to 12 are not driven and controlled, current flows through the body diodes). Or when the switch of the bypass switch 6 is turned on, the bus capacitor 8 and the DC power supply 1 are charged.

[0117] In fact, since the cable of the DC power supply 1 is long, the voltage drop due to the wiring resistance of the cable of the DC power supply 1 cannot be ignored. On the other hand, the bus bar and cable connected to the bus capacitor 8 at the input part of the power conversion device 2 are shorter than the cable of the DC power supply 1 and the influence of the wiring resistance is small.

[0118] Therefore, since the bus capacitor 8 is charged faster than the DC power supply 1, when the charging of the bus capacitor 8 is completed, the bus voltage sensor 9 stabilizes at a certain voltage. Thus, the detected value of the charging terminal voltage sensor 24 can be compared with that of the bus voltage sensor 9 (comparison may also be made including the charger voltage sensor 27). If the detected values of the charging terminal voltage sensor 24 and the bus voltage sensor 9 are the same, the charger voltage sensor 27 is faulty. If the detected values of the charging terminal voltage sensor 24 and the bus voltage sensor 9 are different, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0119] When either the charging terminal voltage sensor 24 or the charger voltage sensor 27 is faulty and the power supply voltage V1 of the DC power supply 1 is lower than the charger voltage V4 of the charger 5, by providing the bus capacitor 8, the bus voltage V2 of the bus capacitor 8 immediately rises above the power supply voltage V1 of the DC power supply 1. Therefore, it becomes possible to shorten the time for balancing the power supply voltage V1 of the DC power supply 1 and the charger voltage V4 of the charger 5.

[0120] 6. Embodiment 6 <Charge current limiting section> FIG. 9 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 6. As the functional block diagram of the rotating electrical machine device 100, FIG. 4 can be applied. FIG. 9 is different from FIG. 8 according to Embodiment 5 in that a charge current limiting section 61 is provided.

[0121] When any one of the power supply voltage sensor 7, the bus voltage sensor 9, the charging terminal voltage sensor 24, and the charger voltage sensor 27 malfunctions, the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 (including the bus capacitor 8) is balanced with the charging terminal voltage V3 output by the charging terminal voltage sensor 24 of the capacitor 25 of the switch. Then, an abnormality determination can be made by comparing the detected value of the faulty voltage sensor with the detected value of the normal voltage sensor. The threshold setting for the abnormality determination takes into account the accuracy of the voltage sensor and the voltage drops in the switching elements 10 to 15 of the power conversion device 2, the coils 20 to 22 of the rotating electrical machine 3, the neutral point switch 23 of the switch, the bypass switch 6, and the wiring.

[0122] When any of the voltage sensors fails, the charging current of the charger 5 can be suppressed using the charging current limiting unit 61. By suppressing the current, the voltage drop across each wiring or the like is reduced, and the accuracy of the abnormality determination is improved. The fact that the charging current is limited may be transmitted from the control determination unit of the rotating electrical machine device to the control determination unit of the charger via the control determination unit on the vehicle side by communication via an in-vehicle network typified by CAN.

[0123] Here, the charging current limiting unit 61 is realized by a bypass circuit whose current is limited by a resistor and a parallel circuit including a charging current limiting switch 62, and an example in which diodes are provided as the backflow prevention devices 26a and 26b is shown. However, the configuration of the charging current limiting unit 61 is not limited to this.

[0124] As shown in FIG. 9, a charging switch 31 is provided between the positive electrode of the charger 5 and the positive electrode of the switch capacitor 25. The charging switch 31 may be a semiconductor, a mechanical relay, or the like, and may be arranged on either side before or after the backflow prevention. When the charging switch 31 is turned off, the switch capacitor 25 is disconnected from the charger 5.

[0125] The control unit of the power conversion device 2 notifies the control unit on the vehicle side via an in-vehicle network typified by CAN that a failure has occurred, and the control unit on the vehicle side notifies the control unit of the charger via the in-vehicle network that the voltage sensor has failed. Then, the control unit of the charger 5 may turn off the charging switch 31.

[0126] <Deviation between V3 and V4> Here, when the detected value of the charging terminal voltage sensor 24 and the detected value of the charger voltage sensor 27 deviate, the charging switch 31 is turned off, the neutral point switch 23 of the switch 4 is turned on, and one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device 2 are driven and controlled. Then, regardless of the voltage relationship between the charging terminal voltage V3 of the switch capacitor 25 disconnected from the charger 5 and the bus voltage V2 of the bus capacitor 8, the current flowing through the switch capacitor 25 becomes the same as the sum of the detected values of the phase current sensors 17 to 19.

[0127] <Estimation of the Voltage of the Switching Capacitor> Therefore, it is possible to estimate the increase or decrease in the voltage of the switching capacitor 25 from the detected values of the phase current sensors 17 to 19. When the neutral point switch 23 of the switch 4 is turned on and one or more of the positive electrode side switching elements 10 to 12 of the power conversion device 2 are driven and controlled, the integration of the detected values of the phase current sensors 17 to 19 is started. When the current is integrated by the phase current sensors 17 to 19 for a predetermined time, the increase or decrease in the voltage of the switching capacitor 25 is estimated. The increase or decrease in the voltage of the switching capacitor 25 estimated from the detected values of the phase current sensors 17 to 19 is compared with the increase or decrease in the voltage of the charging terminal voltage sensor 24.

[0128] And if the increase or decrease in the voltage of the switching capacitor 25 estimated from the detected values of the phase current sensors 17 to 19 is the same as the increase or decrease in the voltage of the charging terminal voltage sensor 24, it can be determined that the charger voltage sensor 27 is faulty. If the increase or decrease in the voltage of the switching capacitor 25 estimated from the detected values of the phase current sensors 17 to 19 is different from the increase or decrease in the voltage of the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0129] By using the increase or decrease in the voltage of the switching capacitor 25 estimated from the detected values of the phase current sensors 17 to 19, it is not necessary to wait until the power supply voltage V1 of the DC power supply 1 and the voltage V3 between the charging terminals of the switching capacitor 25 are balanced. Therefore, it is possible to identify the faulty voltage sensor of the charging terminal voltage sensor 24 or the charger voltage sensor 27 earlier.

[0130] 7. Embodiment 7 <Power Switch> FIG. 10 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 7. The rotating electrical machine device 100 according to Embodiment 7 is different from the rotating electrical machine device 100 according to Embodiment 1 in that a power switch 30 is added between the DC power supply 1 and the power conversion device 2.

[0131] Consider the case where any one of the power supply voltage sensor 7, the bus voltage sensor 9, and the charging terminal voltage sensor 24 fails. As a means of confirming the magnitude relationship between the power supply voltage V1 of the DC power supply 1 and the voltage V3 across the charging terminals of the switch capacitor 25, the detected value of the current sensor is used.

[0132] When any one of the power supply voltage sensor 7, the bus voltage sensor 9, the charging terminal voltage sensor 24, and the charger voltage sensor 27 fails, the neutral point switch 23 of the switch 4 is turned on. When the power supply voltage V1 of the DC power supply 1 is lower than the voltage V3 across the charging terminals of the switch capacitor 25, even if one or more of the positive-side switching elements 10 to 12 of the power conversion device 2 are not driven and controlled, current flows through the body diodes of the positive-side switching elements 10 to 12 of the power conversion device 2. Therefore, the detected values of the phase current sensors 17 to 19 indicate the current value flowing from the switch capacitor 25 to the DC power supply 1.

[0133] On the other hand, when the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the voltage V3 across the charging terminals output by the charging terminal voltage sensor 24 of the switch capacitor 25, current does not flow unless one or more of the positive-side switching elements 10 to 12 of the power conversion device are driven and controlled even if the neutral point switch 23 of the switch is turned on. Therefore, the detected value of the phase current sensor becomes zero.

[0134] <Temperature sensor> Here, positive-side switching element temperature sensors 32 and coil temperature sensors 37 to 39 are provided for each phase of the positive-side switching elements 10 to 12 and the coils 20 to 21 of the rotating electrical machine, respectively (the positive-side switching element temperature sensor 32 and the coil temperature sensors 37 to 39 are not shown in FIG. 9). Then, after the neutral point switch 23 of the switch is turned on, it becomes possible to select and drive and control one or more of the positive-side switching elements 10 to 12 of the power conversion device of the phase with a margin for heat. As a result, control can be performed in consideration of the heat resistance of the components, so that the reliability of the components can be improved and the life can be extended.

[0135] In Embodiment 7, as shown in FIG. 10, a power supply switch 30 is provided between the positive electrode of the DC power supply 1 and the positive electrode of the power conversion device 2 to estimate the voltage increase or decrease amount of the bus capacitor 8. When the power supply switch 30 is turned off, the input of the power conversion device 2 is disconnected from the DC power supply 1. The opening and closing of the power supply switch 30 may be performed by the control determination unit on the vehicle side.

[0136] <Estimation of the voltage of the bus capacitor> Here, when the detected value of the power supply voltage sensor 7 and the detected value of the bus voltage sensor 9 deviate, the power supply switch 30 is turned off, the neutral point switch 23 of the switch is turned on, and one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device 2 are driven and controlled. Then, regardless of the voltage relationship between the bus voltage V2 of the bus capacitor 8 disconnected from the DC power supply 1 and the voltage V3 between the charging terminals of the switch capacitor 25 and the presence or absence of connection of the charger 5, the current flowing through the bus capacitor 8 is the same as the sum of the detected values of the phase current sensors 17 to 19.

[0137] Therefore, it is possible to estimate the voltage increase or decrease amount of the bus capacitor 8 from the detected values of the phase current sensors 17 to 19. When the neutral point switch 23 of the switch 4 is turned on and one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device 2 are driven and controlled, the integration of the detected values of the phase current sensors 17 to 19 is started. When the current is integrated by the phase current sensors 17 to 19 for a predetermined time, the voltage increase or decrease amount of the bus capacitor 8 is estimated. The voltage increase or decrease amount of the bus capacitor 8 estimated from the detected values of the phase current sensors 17 to 19 is compared with the voltage increase or decrease amount of the bus voltage sensor 9. If the voltage increase or decrease amount of the bus capacitor 8 estimated from the detected values of the phase current sensors 17 to 19 is substantially the same as the voltage increase or decrease amount of the bus voltage sensor 9, the power supply voltage sensor 7 is faulty. If the voltage increase or decrease amount of the bus capacitor 8 estimated from the detected values of the phase current sensors 17 to 19 is significantly different from the voltage increase or decrease amount of the bus voltage sensor 9, it can be determined that the bus voltage sensor 9 is faulty.

[0138] By using the increase or decrease in the voltage of the bus capacitor 8 estimated from the detection values of the phase current sensors 17 to 19, it is not necessary to wait until the power supply voltage V1 of the DC power supply 1 and the voltage V3 between the charging terminals of the switch capacitor 25 are balanced. Therefore, it is possible to quickly identify the faulty voltage sensor among the power supply voltage sensor 7 or the bus voltage sensor 9.

[0139] 8. Embodiment 8 <Power Switch and Charging Switch> FIG. 11 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 8. The rotating electrical machine device 100 according to Embodiment 8 is different from the rotating electrical machine device 100 according to Embodiment 3 in that a power switch 30 is added between the DC power supply 1 and the positive electrode of the power conversion device 2, and a charging switch 31 is provided between the positive electrode of the charger 5 and the positive electrode of the switch capacitor 25.

[0140] When the power switch 30 is turned off, the input of the power conversion device 2 is disconnected from the DC power supply 1. The opening and closing of the power switch 30 may be performed by the control determination unit on the vehicle side.

[0141] The charging switch 31 may be a semiconductor, a mechanical relay, etc., and may be arranged on either side before or after the reverse current prevention device 26. When the charging switch 31 is turned off, the switch capacitor 25 is disconnected from the charger 5.

[0142] The control unit of the power conversion device 2 notifies the control unit on the vehicle side via an in-vehicle network typified by CAN that a failure has occurred, and the control unit on the vehicle side notifies the control unit of the charger via the in-vehicle network that the voltage sensor has failed. Then, the control unit of the charger 5 may turn off the charging switch 31.

[0143] <Voltage Estimation of Bus Capacitor When V1 and V2 Deviate> In Embodiment 8, as in Embodiment 7, when the detected value of the power supply voltage sensor 7 and the detected value of the bus voltage sensor 9 deviate, the power switch 30 is turned off, the neutral point switch 23 of the switch is turned on, and one or more of the positive-side switching elements 10 to 12 of the power conversion device 2 are driven and controlled. Then, the voltage increase or decrease amount of the bus capacitor 8 is estimated from the detected values of the phase current sensors 17 to 19. By comparing the estimated voltage increase or decrease amount of the bus capacitor 8 with the voltage increase or decrease amount of the bus voltage sensor 9, it is possible to determine the presence or absence of a failure in the bus voltage sensor 9.

[0144] <Voltage Estimation of the Switch Capacitor When V3 and V4 Deviate> In Embodiment 8, in addition to this, when the detected value of the charging terminal voltage sensor 24 and the detected value of the charger voltage sensor 27 deviate, the charging switch 31 is turned off, the neutral point switch 23 of the switch 4 is turned on, and one or more of the positive-side switching elements 10 to 12 of the power conversion device 2 are driven and controlled. Then, the voltage increase or decrease amount of the switch capacitor 25 is estimated from the detected values of the phase current sensors 17 to 19. By comparing the estimated voltage increase or decrease amount of the switch capacitor 25 with the voltage increase or decrease amount of the charging terminal voltage sensor 24, it is possible to determine the presence or absence of a failure in the charging terminal voltage sensor 24.

[0145] Regardless of the voltage relationship between the voltage V3 between the charging terminals of the switch capacitor 25 disconnected from the charger 5 and the bus voltage V2 of the bus capacitor 8, the current flowing through the switch capacitor 25 is the same as the sum of the detected values of the phase current sensors 17 to 19. When the charging switch 31 is turned off, the neutral point switch 23 of the switch 4 is turned on, and one or more of the positive-side switching elements 10 to 12 of the power conversion device 2 are driven and controlled, the integration of the detected values of the phase current sensors 17 to 19 is started. When the current is integrated by the phase current sensors 17 to 19 for a predetermined time, the voltage increase or decrease amount of the switch capacitor 25 is estimated. The estimated voltage increase or decrease amount of the switch capacitor 25 from the detected values of the phase current sensors 17 to 19 is compared with the voltage increase or decrease amount of the charging terminal voltage sensor 24.

[0146] If the voltage increase / decrease amount of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 is the same as the voltage increase / decrease amount of the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is normal and the charger voltage sensor 27 is faulty. If the voltage increase / decrease amount of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 is different from the voltage increase / decrease amount of the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0147] By using the voltage increase / decrease amount of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19, it is not necessary to wait until the power supply voltage V1 of the DC power supply 1 matches the voltage V3 between the charging terminals of the switch capacitor 25. Therefore, it is possible to quickly identify the faulty voltage sensor among the charging terminal voltage sensor 24 and the charger voltage sensor 27.

[0148] 9. Embodiment 9 <Voltage of the Switch Capacitor> FIG. 12 is a circuit configuration diagram of the rotating electrical machine device 100 according to Embodiment 9. In Embodiment 9, before the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 (or the bus voltage V2 between the buses of the bus capacitor 8) matches the voltage V3 between the charging terminals of the switch capacitor 25, the voltage increase amount of the switch capacitor 25 is estimated from the detection values of the phase current sensors 17 to 19, and by comparing the voltage increase amount of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 with the voltage increase amount of the charging terminal voltage sensor 24, a method for identifying the faulty voltage sensor among the charging terminal voltage sensor 24 and the charger voltage sensor 27 will be described.

[0149] In order to estimate the voltage increase amount of the switch capacitor 25, the phase current sensors 17 to 19 are used. When the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the voltage V3 between the charging terminals output by the charging terminal voltage sensor 24 of the switch capacitor 25, the neutral point switch 23 of the switch is turned on, and at least one phase of the positive side switching elements 10 to 12 of the power conversion device 2 is driven and controlled. Thereby, the switch capacitor 25 is charged.

[0150] However, the current flowing through the switch capacitor 25 is the same as the sum of the detection values from the phase current sensors 17 to 19. Therefore, after turning on the neutral point switch 23 of the switch and driving and controlling one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device 2, the detection values of the phase current sensors 17 to 19 are integrated for a predetermined time. In this way, the voltage increment of the switch capacitor 25 can be estimated.

[0151] <Deviation between V3 and V4> Here, when the detection value of the charging terminal voltage sensor 24 and the detection value of the charger voltage sensor 27 deviate, and the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is higher than the charging terminal voltage V3 output by the charging terminal voltage sensor 24 of the switch capacitor 25, the neutral point switch 23 of the switch is turned on, and one or more phases of the positive electrode side switching elements 10 to 12 of the power conversion device are driven and controlled. And at that time, the integration of the detection values of the phase current sensors 17 to 19 is started.

[0152] When the current is integrated for a predetermined time by the phase current sensors 17 to 19, the voltage increment of the switch capacitor 25 is estimated, and the voltage increment of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 is compared with the voltage increment detected by the charging terminal voltage sensor 24. If the voltage increment of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 is the same as the voltage increment detected by the charging terminal voltage sensor 24, it can be determined that the charger voltage sensor 27 is faulty. And if the voltage increment of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19 is different from the voltage increment detected by the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0153] By using the voltage increment of the switch capacitor 25 estimated from the detection values of the phase current sensors 17 to 19, it is not necessary to wait until the power supply voltage V1 of the DC power supply 1 and the charging terminal voltage V3 of the switch capacitor 25 are balanced, so the faulty voltage sensor among the charging terminal voltage sensor 24 or the charger voltage sensor 27 can be identified earlier.

[0154] <Bypass current> By providing a bypass current sensor 29 for the bypass switch 6 in the path of the bypass switch 6, instead of the phase current sensors 17 to 19, the voltage increase of the switch capacitor 25 and the voltage increase and decrease of the bus capacitor 8 can be estimated using the bypass current sensor 29 of the bypass switch 6 as shown in FIG. 11.

[0155] The estimation of the voltage increase of the switch capacitor 25 using the bypass current sensor 29 of the bypass switch 6 will be described. Consider the case where the power supply voltage V1 output by the power supply voltage sensor 7 of the DC power supply 1 is greater than the charging terminal voltage V3 output by the charging terminal voltage sensor 24 between the charging terminals of the switch capacitor 25, and the detected values of the charging terminal voltage sensor 24 and the charger voltage sensor 27 deviate. At this time, when the bypass switch 6 is turned on, the switch capacitor 25 is charged. At that time, the current charged into the switch capacitor 25 is the same as the detected value of the bypass current sensor 29 of the bypass switch 6. Therefore, after turning on the bypass switch 6, the detected value of the bypass current sensor 29 of the bypass switch 6 is integrated for a predetermined time. This makes it possible to estimate the voltage increase of the switch capacitor 25.

[0156] Compare the voltage increase of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 with the voltage increase detected by the charging terminal voltage sensor 24. Then, if the voltage increase of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is the same as the voltage increase detected by the charging terminal voltage sensor 24, it can be determined that the charger voltage sensor 27 is faulty. Also, if the voltage increase of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is different from the voltage increase detected by the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0157] <Voltage estimation of the switch capacitor> The estimation of the voltage increase or decrease of the switch capacitor 25 will be described using the current sensors of the charging switch 31 and the bypass switch 6. Regardless of the voltage relationship between the bus voltage V2 of the bus capacitor 8 and the voltage V3 between the charging terminals of the switch capacitor 25, consider the case where the detected value of the charging terminal voltage sensor 24 and the detected value of the charger voltage sensor 27 deviate. At this time, when the charging switch is turned off and the bypass switch 6 is turned on, charge and discharge are performed on the switch capacitor 25, but the current flowing through the switch capacitor 25 is the same as the detected value of the bypass current sensor 29 of the bypass switch 6.

[0158] Therefore, after turning off the charging switch 31 and turning on the bypass switch 6, by integrating the detected value of the bypass current sensor 29 of the bypass switch 6 for a predetermined time, the voltage increase or decrease of the switch capacitor 25 can be estimated. Compare the voltage increase or decrease of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 with the voltage increase or decrease detected by the charging terminal voltage sensor 24.

[0159] Then, if the voltage increase or decrease of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is the same as the voltage increase or decrease detected by the charging terminal voltage sensor 24, it can be determined that the charger voltage sensor 27 is faulty. And if the voltage increase or decrease of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is different from the voltage increase or decrease detected by the charging terminal voltage sensor 24, it can be determined that the charging terminal voltage sensor 24 is faulty.

[0160] <Estimation of the voltage of the bus capacitor> The estimation of the voltage increase or decrease of the bus capacitor 8 will be described using the bypass current sensor 29 of the bypass switch 6. Consider the case where the detected values of the power supply voltage sensor 7 and the bus voltage sensor 9 deviate, regardless of the voltage relationship between the bus voltage V2 of the bus capacitor 8 and the voltage V3 between the charging terminals of the switch capacitor 25, and regardless of whether the charger 5 is connected or not. At this time, when the power switch 30 is turned off and the bypass switch 6 is turned on, the bus capacitor 8 is charged and discharged, but the current flowing through the bus capacitor 8 is the same as the detected value of the bypass current sensor 29 of the bypass switch 6.

[0161] Therefore, after turning off the power switch 30 and turning on the bypass switch 6, the voltage increase or decrease of the bus capacitor 8 can be estimated by integrating the detected value of the bypass current sensor 29 of the bypass switch 6 for a predetermined time. The voltage increase or decrease of the bus capacitor 8 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is compared with the voltage increase or decrease detected by the bus voltage sensor 9.

[0162] Then, if the voltage increase or decrease of the bus capacitor 8 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is the same as the voltage increase or decrease detected by the bus voltage sensor 9, it can be determined that the power supply voltage sensor 7 is faulty. And if the voltage increase or decrease of the bus capacitor 8 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6 is different from the voltage increase or decrease detected by the bus voltage sensor 9, it can be determined that the bus voltage sensor 9 is faulty.

[0163] The voltage increase of the switch capacitor 25 estimated from the detected value of the bypass current sensor 29 of the bypass switch 6, the voltage increase or decrease of the switch capacitor 25 when the charging switch 31 is used, and the voltage increase or decrease of the bus capacitor 8 are utilized. By doing so, it is not necessary to wait until the power supply voltage V1 of the DC power supply 1 and the voltage V3 between the charging terminals of the switch capacitor 25 are balanced. Therefore, it is possible to identify the faulty voltage sensor earlier. Furthermore, by passing through the bypass switch 6 as the current path, the heat generation of the power conversion device 2 and the rotating electrical machine 3 can be suppressed.

[0164] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more of the embodiments are not limited to the application of a particular embodiment, but are applicable to the embodiments alone or in various combinations. Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed to include cases where at least one component is modified, added, or omitted, and further cases where at least one component is extracted and combined with components of other embodiments.

[0165] Hereinafter, aspects of the present disclosure will be collectively described as appendices.

[0166] (Appendix 1) A positive-side bus connected to the positive side of a DC power supply, A negative-side bus connected to the negative side of the DC power supply, A bus voltage sensor that detects the bus voltage, which is the voltage between the positive-side bus and the negative-side bus, A positive-side switching element having a positive-side diode connected in anti-parallel and connected to the positive-side bus, a negative-side switching element having a negative-side diode connected in anti-parallel and connected to the negative-side bus, and a power conversion circuit having a plurality of legs that connect the positive-side switching element and the negative-side switching element in series and are provided with external connection points, A rotating electrical machine having a plurality of coils with one end connected to the external connection points of the power conversion circuit and the other end connected to a neutral point, A positive-side charging terminal connected to the neutral point of the rotating electrical machine via a neutral point switch, A negative-side charging terminal connected to the negative-side bus, A charging terminal voltage sensor that detects the charging terminal voltage, which is the voltage between the positive-side charging terminal and the negative-side charging terminal, and To drive the rotating electrical machine, the positive-side switching element and the negative-side switching element of the power conversion circuit are controlled to be turned on and off. When the rotating electrical machine is in a non-driven state, at least one of the positive-side switching elements and the neutral point switch are turned on, and a control determination unit that compares the bus voltage and the voltage between the charging terminals to determine whether the bus voltage sensor or the voltage sensor between the charging terminals is abnormal, is provided in a rotating electrical machine device. (Appendix 2) The control determination unit according to Appendix 1, turns on at least one of the positive-side switching elements and the neutral point switch when the rotating electrical machine is in a non-driven state, and determines that the bus voltage sensor and the voltage sensor between the charging terminals are normal when the absolute value of the difference between the bus voltage and the voltage between the charging terminals is smaller than a predetermined voltage difference abnormality determination value, and determines that the bus voltage sensor or the voltage sensor between the charging terminals is abnormal when the absolute value of the difference between the bus voltage and the voltage between the charging terminals is greater than or equal to the voltage difference abnormality determination value, in the rotating electrical machine device described in Appendix 1. (Appendix 3) The control determination unit according to Appendix 1 or 2, receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect the power supply voltage, turns on at least one of the positive-side switching elements and the neutral point switch when the rotating electrical machine is in a non-driven state, and compares the power supply voltage, the bus voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor is abnormal, whether the voltage sensor between the charging terminals is abnormal, and whether the power supply voltage sensor is abnormal, in the rotating electrical machine device described in Appendix 1 or 2. (Appendix 4) The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply for detecting the power supply voltage, and determines that the power supply voltage sensor and the bus voltage sensor are normal when the absolute value of the difference between the power supply voltage and the bus voltage is smaller than a predetermined power supply voltage difference determination value. When the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than the power supply voltage difference determination value, at least one of the positive electrode side switching elements and the neutral point switch are turned on in a state where the rotating electrical machine is not driven, and the power supply voltage, the bus voltage, and the voltage between the charging terminals are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 1 to 3. (Appendix 5) It includes a phase current sensor that detects the phase current flowing from the external connection point of the power conversion circuit to each coil of the rotating electrical machine. The control determination unit turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven, and after the absolute value of the phase current detected by the phase current sensor becomes equal to or less than a predetermined current stop determination value, the power supply voltage, the bus voltage, and the voltage between the charging terminals are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to Appendix 4. (Appendix 6) When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, the control determination unit turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven. When the absolute value of the difference between the power supply voltage and the voltage between the charging terminals is smaller than a predetermined voltage difference abnormality determination value, it is determined that the power supply voltage sensor and the voltage sensor between the charging terminals are normal. When the absolute value of the difference between the power supply voltage and the voltage between the charging terminals is greater than or equal to the voltage difference abnormality determination value, it is determined that the power supply voltage sensor is abnormal. When the absolute value of the difference between the bus voltage and the voltage between the charging terminals is smaller than the voltage difference abnormality determination value, it is determined that the bus voltage sensor and the voltage sensor between the charging terminals are normal. When the absolute value of the difference between the bus voltage and the voltage between the charging terminals is greater than or equal to the voltage difference abnormality determination value, it is determined that the bus voltage sensor is abnormal. The rotating electrical machine device according to Additional Note 4 or 5. (Additional Note 7) It includes a bypass switch that connects the positive electrode side charging terminal and the positive electrode side bus. The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect the power supply voltage. When the absolute value of the difference between the power supply voltage and the bus voltage is smaller than a predetermined power supply voltage difference determination value, it is determined that the power supply voltage sensor and the bus voltage sensor are normal. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the predetermined power supply voltage difference determination value, with the neutral point switch turned off, the bypass switch is turned on and the power supply voltage, the bus voltage, and the voltage between the charging terminals are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to any one of Additional Notes 1 to 6. (Additional Note 8) The control determination unit receives a signal from a charger current sensor that detects a charger current output by a charger connected to the positive electrode side charging terminal and the negative electrode side charging terminal, and when the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to a power supply voltage difference determination value in a state where the neutral point switch is turned off, turns on the bypass switch, and after the absolute value of the charger current detected by the charger current sensor becomes less than or equal to a predetermined bypass current stop determination value, compares the power supply voltage, the bus voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to Supplementary Note 7. (Supplementary Note 9) The device includes a bypass current sensor that detects a bypass current flowing through the bypass switch. The control determination unit turns on the bypass switch in a state where the neutral point switch is turned off when the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, and after the absolute value of the bypass current detected by the bypass current sensor becomes less than or equal to a predetermined bypass current stop determination value, compares the power supply voltage, the bus voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to Supplementary Note 7 or 8. (Supplementary Note 10) The positive electrode side charging terminal and the negative electrode side charging terminal are connected to a charger having a reverse current prevention device and a charger voltage sensor that detects a charger voltage. The control determination unit receives a detection signal from a power supply voltage sensor provided in the DC power supply that detects the power supply voltage and a detection signal from the charger voltage sensor of the charger, and based on the power supply voltage or the bus voltage, the voltage between the charging terminals, and the charger voltage, determines whether the charger voltage sensor is abnormal and whether the total demand charging terminal voltage sensor is abnormal. The rotating electrical machine device according to any one of Supplementary Notes 1 to 9. (Supplementary Note 11) When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is smaller than a predetermined charging voltage difference determination value, the control determination unit determines that the charger voltage sensor and the voltage sensor between the charging terminals are normal. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to the charging voltage difference determination value, with the rotating electrical machine in a non-driven state, at least one of the positive-side switching elements and the neutral point switch are turned on, and the power supply voltage or the voltage between the buses is compared with the voltage between the charging terminals to determine whether the charger voltage sensor is abnormal and whether the voltage sensor between the charging terminals is abnormal. The rotating electrical machine device according to supplementary note 10. (Supplementary note 12) It includes a bus capacitor connected between the positive-side bus and the negative-side bus. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, with the rotating electrical machine in a non-driven state, at least one of the positive-side switching elements and the neutral point switch are turned on, and the voltage between the buses is compared with the voltage between the charging terminals to determine whether the charger voltage sensor is abnormal and whether the voltage sensor between the charging terminals is abnormal. The rotating electrical machine device according to supplementary note 10 or 11. (Supplementary note 13) A bus capacitor connected between the positive-side bus and the negative-side bus, and It includes a bypass switch that connects the positive-side charging terminal and the positive-side bus. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, with the neutral point switch turned off, the bypass switch is turned on, and the voltage between the buses is compared with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to any one of supplementary notes 10 to 12. (Supplementary note 14) A phase current sensor that detects the phase current flowing from the external connection point of the power conversion circuit to each coil of the rotating electrical machine, and It includes a switch capacitor connected between the positive electrode side charging terminal and the negative electrode side charging terminal. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven, and then estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 10 to 13. (Appendix 15) It includes a charging switch connected between the charger and the positive electrode side charging terminal. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns off the charging switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements and the neutral point switch, and then estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to Appendix 14. (Appendix 16) When the absolute value of the difference between the power supply voltage and the voltage between the buses is greater than or equal to a predetermined power supply voltage difference determination value or the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit determines whether the power supply voltage sensor, the bus voltage sensor, the charger voltage sensor, or the voltage sensor between the charging terminals is abnormal. The rotating electrical machine device according to any one of Appendices 10 to 15. (Appendix 17) The charger has a charging current limiting unit. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit instructs the charging current limiting unit to limit the charging current, compares the power supply voltage, the bus voltage, the charger voltage, and the voltage between the charging terminals, and determines whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to Supplementary Note 16. (Supplementary Note 18) It includes a positive electrode side switching element temperature sensor for detecting the temperature of the positive electrode side switching element. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on the neutral point switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements selected based on the temperature detected by the positive electrode side switching element temperature sensor, compares the power supply voltage, the bus voltage, the charger voltage, and the voltage between the charging terminals, and determines whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to Supplementary Note 16 or 17. (Supplementary Note 19) It includes a coil temperature sensor for detecting the temperature of the coil of the rotating electrical machine. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on the neutral point switch when the rotating electrical machine is in a non-driven state, turns on at least one of the positive electrode side switching elements selected based on the temperature detected by the coil temperature sensor, compares the power supply voltage, the bus voltage, the charger voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 16 to 18. (Appendix 20) A bypass switch that connects the positive electrode side charging terminal and the positive electrode side bus; A bypass switch temperature sensor that detects the temperature of the bypass switch, and It is provided with a neutral point switch temperature sensor that detects the temperature of the neutral point switch, When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, if the temperature of the neutral point switch is lower than the temperature of the bypass switch, at least one of the positive electrode side switching elements and the neutral point switch are turned on when the rotating electrical machine is in a non-driven state, and if the temperature of the neutral point switch is greater than or equal to the temperature of the bypass switch, the bypass switch is turned on in a state where the neutral point switch is turned off, and it is determined whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 16 to 19. (Appendix 21) A power supply switch that connects the positive electrode side of the DC power supply and the positive electrode side bus; A bus capacitor connected between the positive electrode side bus and the negative electrode side bus, and A phase current sensor for detecting a phase current flowing from an external connection point of the power conversion circuit to each coil of the rotating electrical machine is provided. The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply for detecting the power supply voltage, and when the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than a predetermined power supply voltage difference determination value, the control determination unit turns off the power switch when the rotating electrical machine is in a non-driven state, turns on at least one of the positive-side switching elements and the neutral point switch, and then estimates the voltage of the bus capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the bus voltage to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 1 to 20. (Appendix 22) A switch capacitor connected between the positive charging terminal and the negative charging terminal, and A charging switch for connecting between the charger and the positive charging terminal is provided. The positive charging terminal and the negative charging terminal are connected to the charger having a reverse current prevention device and a charger voltage sensor for detecting the charger voltage. The control determination unit turns off the charging switch when the rotating electrical machine is in a non-driven state when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, turns on at least one of the positive-side switching elements and the neutral point switch, and then estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to Appendix 21. (Appendix 23) A power switch for connecting the positive side of the DC power supply and the positive bus, A bus capacitor connected between the positive bus and the negative bus, A phase current sensor for detecting a phase current flowing from an external connection point of the power conversion circuit to each coil of the rotating electrical machine, A bypass switch that connects the positive electrode side charging terminal and the positive electrode side bus bar, A bypass current sensor that detects a bypass current flowing through the bypass switch, A switch capacitor connected between the positive electrode side charging terminal and the negative electrode side charging terminal, and A charging switch that connects a charger and the positive electrode side charging terminal, The positive electrode side charging terminal and the negative electrode side charging terminal are connected to a charger having a reverse current prevention device and a charger voltage sensor that detects a charger voltage, The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect the power supply voltage, and when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value in a state where the neutral point switch is turned off, turns off the charging switch, turns on the bypass switch, and then estimates the voltage of the switch capacitor based on the bypass current detected by the bypass current sensor and the time during which the bypass current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals or the charger voltage sensor is abnormal The control determination unit turns off the power switch in a state where the rotating electrical machine is not driven and turns on the bypass switch when the absolute value of the difference between the power supply voltage and the voltage between the bus bars is equal to or greater than a predetermined power supply voltage difference determination value in a state where the neutral point switch is turned off, and then estimates the voltage of the bus capacitor based on the bypass current detected by the bypass current sensor and the time during which the bypass current flows, and compares it with the voltage between the bus bars to determine whether the voltage sensor between the bus bars or the power supply voltage sensor is abnormal. The rotating electrical machine device according to any one of Appendices 1 to 22 (Appendix 24) The positive electrode side switching element having a positive electrode side diode connected in anti-parallel in the power conversion circuit and the negative electrode side switching element having a negative electrode side diode connected in anti-parallel use MOS-FET. The rotating electrical machine device according to any one of Appendices 1 to 23

Explanation of symbols

[0167] 1 DC power supply, 3 rotating electrical machine, 5 charger, 6 bypass switch, 7 power supply voltage sensor, 8 bus capacitor, 9 bus voltage sensor, 10, 11, 12 positive side switching element, 13, 14, 15 negative side switching element, 16 control determination unit, 17, 18, 19 phase current sensor, 20, 21, 22 coil, 23 neutral point switch, 24 charging terminal voltage sensor, 25 switch capacitor, 26 reverse current prevention device, 27 charger voltage sensor, 28 charger current sensor, 29 bypass current sensor, 30 power supply switch, 31 charging switch, 32 positive side switching element temperature sensor, 34 bypass switch temperature sensor, 35 neutral point switch temperature sensor, 36 neutral point, 37, 38, 39 coil temperature sensor, 51 positive side bus, 52 negative side bus, 58 positive side charging terminal, 59 negative side charging terminal, 60 power conversion circuit, 61 charging current limiting unit, 100 rotating electrical machine device

Claims

1. A positive-side bus connected to the positive side of a DC power supply, A negative-side bus connected to the negative side of the DC power supply, A bus voltage sensor that detects the bus voltage, which is the voltage between the positive-side bus and the negative-side bus, A positive-side switching element connected to the positive-side bus and having a positive-side diode connected in anti-parallel, a negative-side switching element connected to the negative-side bus and having a negative-side diode connected in anti-parallel, and a power conversion circuit having a plurality of legs that connect the positive-side switching element and the negative-side switching element in series and are provided with external connection points, A rotating electrical machine having a plurality of coils with one end connected to the external connection points of the power conversion circuit and the other end connected to a neutral point, A positive-side charging terminal connected to the neutral point of the rotating electrical machine via a neutral point switch, A negative-side charging terminal connected to the negative-side bus, A charging terminal voltage sensor that detects the charging terminal voltage, which is the voltage between the positive-side charging terminal and the negative-side charging terminal, and A control determination unit that controls the on / off of the positive-side switching element and the negative-side switching element of the power conversion circuit to drive the rotating electrical machine, turns on at least one of the positive-side switching elements and the neutral point switch when the rotating electrical machine is in a non-driven state, compares the bus voltage and the charging terminal voltage, and determines whether the bus voltage sensor or the charging terminal voltage sensor is abnormal. A rotating electrical machine device comprising the above components.

2. The control determination unit turns on at least one of the positive-side switching elements and the neutral point switch when the rotating electrical machine is in a non-driven state, and determines that the bus voltage sensor and the charging terminal voltage sensor are normal when the absolute value of the difference between the bus voltage and the charging terminal voltage is smaller than a predetermined voltage difference abnormality determination value, and determines that the bus voltage sensor or the charging terminal voltage sensor is abnormal when the absolute value of the difference between the bus voltage and the charging terminal voltage is equal to or greater than the voltage difference abnormality determination value. The rotating electrical machine device according to Claim 1.

3. The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect a power supply voltage, turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven, and compares the power supply voltage, the bus voltage, and the charging terminal voltage to determine whether the bus voltage sensor is abnormal, whether the charging terminal voltage sensor is abnormal, and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 1.

4. The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect a power supply voltage, and determines that the power supply voltage sensor and the bus voltage sensor are normal when the absolute value of the difference between the power supply voltage and the bus voltage is smaller than a predetermined power supply voltage difference determination value. When the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than the power supply voltage difference determination value, at least one of the positive electrode side switching elements and the neutral point switch are turned on in a state where the rotating electrical machine is not driven, and the power supply voltage, the bus voltage, and the charging terminal voltage are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 1.

5. It includes a phase current sensor that detects a phase current flowing from an external connection point of the power conversion circuit to each coil of the rotating electrical machine. The control determination unit turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven, and after the absolute value of the phase current detected by the phase current sensor becomes equal to or less than a predetermined current stop determination value, the power supply voltage, the bus voltage, and the charging terminal voltage are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 4.

6. When the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than the power supply voltage difference determination value, the control determination unit turns on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven. When the absolute value of the difference between the power supply voltage and the voltage between the charging terminals is smaller than a predetermined voltage difference abnormality determination value, it is determined that the power supply voltage sensor and the voltage sensor between the charging terminals are normal. When the absolute value of the difference between the power supply voltage and the voltage between the charging terminals is equal to or greater than the voltage difference abnormality determination value, it is determined that the power supply voltage sensor is abnormal. When the absolute value of the difference between the bus voltage and the voltage between the charging terminals is smaller than the voltage difference abnormality determination value, it is determined that the bus voltage sensor and the voltage sensor between the charging terminals are normal. When the absolute value of the difference between the bus voltage and the voltage between the charging terminals is equal to or greater than the voltage difference abnormality determination value, it is determined that the bus voltage sensor is abnormal. The rotating electrical machine device according to claim 4.

7. comprising a bypass switch that connects the positive electrode side charging terminal and the positive electrode side bus; The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply to detect the power supply voltage. When the absolute value of the difference between the power supply voltage and the bus voltage is smaller than a predetermined power supply voltage difference determination value, it is determined that the power supply voltage sensor and the bus voltage sensor are normal. When the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than the predetermined power supply voltage difference determination value, with the neutral point switch turned off, the bypass switch is turned on, and the power supply voltage, the bus voltage, and the voltage between the charging terminals are compared to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 1.

8. The control determination unit receives a signal from a charger current sensor that detects a charger current output by a charger connected to the positive electrode side charging terminal and the negative electrode side charging terminal, and when the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to a power supply voltage difference determination value in a state where the neutral point switch is turned off, turns on the bypass switch, and after the absolute value of the charger current detected by the charger current sensor becomes less than or equal to a predetermined bypass current stop determination value, compares the power supply voltage, the bus voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 7.

9. Comprising a bypass current sensor that detects a bypass current flowing through the bypass switch, The control determination unit turns on the bypass switch in a state where the neutral point switch is turned off when the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, and after the absolute value of the bypass current detected by the bypass current sensor becomes less than or equal to a predetermined bypass current stop determination value, compares the power supply voltage, the bus voltage, and the voltage between the charging terminals to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 7.

10. The positive electrode side charging terminal and the negative electrode side charging terminal are connected to a charger having a reverse current prevention device and a charger voltage sensor that detects a charger voltage, The control determination unit receives a detection signal from a power supply voltage sensor provided in the DC power supply that detects the power supply voltage and a detection signal from the charger voltage sensor of the charger, and based on the power supply voltage or the bus voltage, the voltage between the charging terminals, and the charger voltage, determines whether the charger voltage sensor is abnormal and whether the voltage sensor between the charging terminals is abnormal. The rotating electrical machine device according to claim 1.

11. When the absolute value of the difference between the charger voltage and the voltage across the charging terminals is smaller than a predetermined charging voltage difference determination value, the control determination unit determines that the charger voltage sensor and the voltage sensor across the charging terminals are normal. When the absolute value of the difference between the charger voltage and the voltage across the charging terminals is greater than or equal to the charging voltage difference determination value, with the rotating electrical machine in a non-driven state, at least one of the positive-side switching elements and the neutral point switch are turned on, and the power supply voltage or the voltage between the buses is compared with the voltage across the charging terminals to determine whether the charger voltage sensor is abnormal and whether the voltage sensor across the charging terminals is abnormal. The rotating electrical machine device according to claim 10.

12. Comprising a bus capacitor connected between the positive-side bus and the negative-side bus, When the absolute value of the difference between the charger voltage and the voltage across the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on at least one of the positive-side switching elements and the neutral point switch with the rotating electrical machine in a non-driven state, and compares the voltage between the buses with the voltage across the charging terminals to determine whether the charger voltage sensor is abnormal and whether the voltage sensor across the charging terminals is abnormal. The rotating electrical machine device according to claim 10.

13. A bus capacitor connected between the positive-side bus and the negative-side bus, and Comprising a bypass switch connecting the positive-side charging terminal and the positive-side bus, When the absolute value of the difference between the charger voltage and the voltage across the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on the bypass switch with the neutral point switch turned off, and compares the voltage between the buses with the voltage across the charging terminals to determine whether the voltage sensor across the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 10.

14. A phase current sensor for detecting the phase current flowing from the external connection point of the power conversion circuit to each coil of the rotating electrical machine, and Comprising a switch capacitor connected between the positive-side charging terminal and the negative-side charging terminal When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, after turning on at least one of the positive electrode side switching elements and the neutral point switch in a state where the rotating electrical machine is not driven, the control determination unit estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 10.

15. A charging switch is provided for connecting between the charger and the positive electrode side charging terminal. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, the control determination unit turns off the charging switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements and the neutral point switch, and then estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the voltage sensor between the charging terminals is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 14.

16. When the absolute value of the difference between the power supply voltage and the voltage between the buses is equal to or greater than a predetermined power supply voltage difference determination value or the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, the control determination unit determines whether the power supply voltage sensor, the voltage sensor between the buses, the charger voltage sensor, or the voltage sensor between the charging terminals is abnormal. The rotating electrical machine device according to claim 10.

17. The charger has a charging current limiting unit. When the absolute value of the difference between the power supply voltage and the voltage between the buses is equal to or greater than the power supply voltage difference determination value or the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, the control determination unit instructs the charging current limiting unit to limit the charging current, compares the power supply voltage, the voltage between the buses, the charger voltage, and the voltage between the charging terminals to determine whether the voltage sensor between the buses or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 16.

18. It is provided with a positive electrode side switching element temperature sensor for detecting the temperature of the positive electrode side switching element. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on the neutral point switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements selected based on the temperature detected by the positive electrode side switching element temperature sensor, compares the power supply voltage, the bus voltage, the charger voltage, and the voltage between the charging terminals, and determines whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 16.

19. It is provided with a coil temperature sensor for detecting the temperature of the coil of the rotating electrical machine. When the absolute value of the difference between the power supply voltage and the bus voltage is greater than or equal to the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is greater than or equal to a predetermined charging voltage difference determination value, the control determination unit turns on the neutral point switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements selected based on the temperature detected by the coil temperature sensor, compares the power supply voltage, the bus voltage, the charger voltage, and the voltage between the charging terminals, and determines whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 16.

20. A bypass switch for connecting the positive electrode side charging terminal and the positive electrode side bus. A bypass switch temperature sensor for detecting the temperature of the bypass switch, and It is provided with a neutral point switch temperature sensor for detecting the temperature of the neutral point switch. When the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than the power supply voltage difference determination value, or when the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, if the temperature of the neutral point switch is lower than the temperature of the bypass switch, at least one of the positive electrode side switching elements and the neutral point switch are turned on in a state where the rotating electrical machine is not driven, and if the temperature of the neutral point switch is equal to or higher than the temperature of the bypass switch, the bypass switch is turned on in a state where the neutral point switch is turned off, and it determines whether the bus voltage sensor or the power supply voltage sensor is abnormal, and whether the charger voltage sensor or the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 16.

21. A power switch that connects the positive electrode side of the DC power supply and the positive electrode side bus; A bus capacitor connected between the positive electrode side bus and the negative electrode side bus, and A phase current sensor that detects a phase current flowing from an external connection point of the power conversion circuit to each coil of the rotating electrical machine, The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply for detecting a power supply voltage, and when the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than a predetermined power supply voltage difference determination value, turns off the power switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements and the neutral point switch, and then estimates the voltage of the bus capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the bus voltage to determine whether the bus voltage sensor is abnormal and whether the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 1.

22. A switch capacitor connected between the positive electrode side charging terminal and the negative electrode side charging terminal, and A charging switch that connects between the charger and the positive electrode side charging terminal, The positive electrode side charging terminal and the negative electrode side charging terminal are connected to the charger having a reverse current prevention device and a charger voltage sensor for detecting a charger voltage. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value, the control determination unit turns off the charging switch in a state where the rotating electrical machine is not driven, turns on at least one of the positive electrode side switching elements and the neutral point switch, and then estimates the voltage of the switch capacitor based on the phase current detected by the phase current sensor and the time during which the phase current flows, and compares it with the voltage between the charging terminals to determine whether the charging terminal voltage sensor is abnormal and whether the charger voltage sensor is abnormal. The rotating electrical machine device according to claim 21.

23. A power switch that connects the positive electrode side of the DC power supply and the positive electrode side busbar; A bus capacitor connected between the positive electrode side busbar and the negative electrode side busbar; A phase current sensor that detects the phase current flowing from the external connection point of the power conversion circuit to each coil of the rotating electrical machine; A bypass switch that connects the positive electrode side charging terminal and the positive electrode side busbar; A bypass current sensor that detects the bypass current flowing through the bypass switch; A switch capacitor connected between the positive electrode side charging terminal and the negative electrode side charging terminal; and A charging switch that connects a charger and the positive electrode side charging terminal; The positive electrode side charging terminal and the negative electrode side charging terminal are connected to a charger having a reverse current prevention device and a charger voltage sensor that detects the charger voltage. The control determination unit receives a detection signal of a power supply voltage sensor provided in the DC power supply and detects the power supply voltage. When the absolute value of the difference between the charger voltage and the voltage between the charging terminals is equal to or greater than a predetermined charging voltage difference determination value in a state where the neutral point switch is turned off, the control determination unit turns off the charging switch, turns on the bypass switch, and then estimates the voltage of the switch capacitor based on the bypass current detected by the bypass current sensor and the time during which the bypass current flows, and compares it with the voltage between the charging terminals to determine whether the charging terminal voltage sensor or the charger voltage sensor is abnormal. The control determination unit turns off the power switch when the absolute value of the difference between the power supply voltage and the bus voltage is equal to or greater than a predetermined power supply voltage difference determination value in a state where the neutral point switch is turned off, turns on the bypass switch after the power switch is turned off in a state where the rotating electrical machine is not driven, estimates the voltage of the bus capacitor based on the bypass current detected by the bypass current sensor and the time during which the bypass current flows, and compares the voltage with the bus voltage to determine whether the bus voltage sensor or the power supply voltage sensor is abnormal. The rotating electrical machine device according to claim 1.

24. The positive-side switching element having a positive-side diode connected in antiparallel to the power conversion circuit and the negative-side switching element having a negative-side diode connected in antiparallel to the power conversion circuit are the rotating electrical machine devices according to any one of claims 1 to 23 using MOS-FETs.

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