Power conversion apparatus and program

Abstract

This power conversion apparatus comprises: an inverter (20); a motor (10) with armature coils (11); an inter-power-storage-unit switch (40) provided on an inter-power-storage-unit electric path (24) electrically connecting a negative electrode terminal of a first power storage unit (31) and a positive electrode terminal of a second power storage unit (32); a bypass switch (50, 51); motor side electric paths (25 to 28) electrically connecting the armature coils and the inter-power-storage-unit electric path; a first electric device (80); and a second electric device (90). The first electric device can be, for example, electrically connected in parallel to a power storage unit of interest, which is one of the first and second power storage units. The second electric device can be electrically connected to an object other than the object to which the first electric device is connected.

Description

Power conversion device and program CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2022-144023, filed on September 9, 2022, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a power conversion device and a program.

[0003] Conventionally, there has been known a power supply device capable of switching the connection state of two batteries between a series connection state and a parallel connection state, as described in, for example, Patent Document 1. This power supply device includes a relay for switching the connection state of the two batteries to an external charger between a series connection state and a parallel connection state.

[0004] Japanese Patent Application Laid-Open No. 2022-87465

[0005] There is a demand for a new power conversion device that can switch the connection state of a power storage unit such as a battery.

[0006] A main object of the present disclosure is to provide a power conversion device and a program that can switch the connection state of a first power storage unit and a second power storage unit.

[0007] The present disclosure relates to a power conversion device including: a high-potential side electrical path electrically connectable to a positive terminal of a first power storage unit; a low-potential side electrical path electrically connectable to a negative terminal of a second power storage unit; an inverter having an upper arm switch electrically connected to the high-potential side electrical path and a lower arm switch electrically connected to the low-potential side electrical path; and a motor having an armature winding electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member, wherein the power storage unit inter-switch is provided in the power storage unit inter-electrical path electrically connecting the negative terminal of the first power storage unit and the positive terminal of the second power storage unit; a bypass switch which makes at least one of an electrical connection between the negative terminals of the first power storage unit and the second power storage unit and an electrical connection between the positive terminals of the first power storage unit and the second power storage unit; a motor-side electrical path electrically connecting the armature winding or the conductive member to the power storage unit inter-electrical path; The power storage device includes a first electrical device that can be electrically connected in parallel to a target electrical storage unit, which is either the first electrical storage unit or the second electrical storage unit, or that can be electrically connected between the high-potential side electrical path and the low-potential side electrical path, and a second electrical device that can be electrically connected between the high-potential side electrical path and the low-potential side electrical path, the first electrical storage unit, and the second electrical storage unit other than the connection target of the first electrical device.

[0008] In the present disclosure, the first and second power storage units are connected in series by turning on the inter-power storage unit switch and turning off the bypass switch. Meanwhile, the first and second power storage units are connected in parallel via the inverter and the armature winding by turning off the inter-power storage unit switch and turning on the bypass switch. In this way, the present disclosure makes it possible to switch the connection state of the first and second power storage units. Furthermore, the configuration of the motor and the inverter is also utilized to switch the connection state. Therefore, it is possible to provide a power conversion device with a simplified configuration.

[0009] The present disclosure includes a first electrical device and a second electrical device. The first electrical device can be electrically connected in parallel to a target power storage unit, which is either a first or second power storage unit, or can be electrically connected between a high-potential side electrical path and a low-potential side electrical path. The second electrical device can be electrically connected between the high-potential side electrical path and the low-potential side electrical path, or to one of the first power storage unit and the second power storage unit other than the target power storage unit to which the first electrical device is connected. Because the first and second electrical devices are connected to different destinations, for example, it is possible to selectively use the first and second electrical devices depending on the operating state of a power conversion device, or to prevent both the first and second electrical devices from becoming inoperable if an abnormality occurs in either the first or second storage battery. In other words, redundancy can be enhanced with respect to the operation of the electrical devices.

[0010] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. 10 is a flowchart showing the procedure for controlling the operation state of the electrical equipment; FIG. 11 is a diagram showing the operation mode of the switches in mode 1 of the low-voltage DC charging mode; FIG. 12 is a diagram showing the operation mode of the switches in mode 2 of the low-voltage DC charging mode; FIG. 13 is a diagram showing the operation mode of the switches in mode 3 of the low-voltage DC charging mode; 23 is a diagram showing the operation mode of the switches in the parking mode, FIG. 24 is a diagram showing the operation mode of the switches in the series neutral point mode, FIG. 25 is a diagram showing the operation mode of the switches in mode 1 of the low-voltage DC charging mode, FIG. 26 is a diagram showing the operation mode of the switches in mode 2 of the low-voltage DC charging mode, FIG. 27 is a diagram showing the operation mode of the switches in mode 3 of the low-voltage DC charging mode, and FIG.30 is a diagram showing the operation mode of the switches in the series neutral point mode according to a modified example of the third embodiment; FIG. 31 is an overall configuration diagram of a system according to a fourth embodiment; FIG. 32 is a flowchart showing the procedure for controlling the operation state of the electrical equipment; FIG. 33 is a flowchart showing the procedure for controlling the operation state of the electrical equipment; FIG. 34 is an overall configuration diagram of a system according to a fifth embodiment; FIG. 35 is a diagram showing the operation mode of the switches in the high-voltage DC charging mode; FIG. 36 is a diagram showing the operation mode of the switches in the vehicle running mode; 40 is a diagram showing the operation of the switches in parking mode, FIG. 41 is a diagram showing the operation of the switches in series neutral point mode, FIG. 42 is a diagram showing the operation of the switches in mode 1 of the low-voltage DC charging mode, FIG. 43 is a diagram showing the operation of the switches in mode 2 of the low-voltage DC charging mode, FIG. 44 is a diagram showing the operation of the switches in mode 3 of the low-voltage DC charging mode, FIG. 45 is a diagram showing the operation of the switches in low-voltage AC charging mode, FIG. 46 is a diagram showing the operation of the switches in a storage battery temperature increase mode, FIG. 47 is a diagram showing the operation of the switches in a high-voltage AC charging mode according to the sixth embodiment, FIG. 48 is a diagram showing the operation of the switches in series neutral point mode, FIG. 49 is an overall configuration diagram of a system according to the seventh embodiment, and FIG. 50 is an overall configuration diagram of a system according to other embodiments.

[0011] Several embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding and / or associated parts may be designated by the same reference numerals or reference numerals that differ in the hundredth or more digit. For corresponding and / or associated parts, reference may be made to the descriptions of other embodiments.

[0012] A first embodiment of a power conversion device according to the present disclosure will now be described with reference to the drawings. The power conversion device of this embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle, and forms an in-vehicle system.

[0013] The system mounted on the vehicle CA includes a power conversion device. As shown in FIG. 1, the power conversion device includes a motor 10, an inverter 20, a high-potential side electrical path 22H, and a low-potential side electrical path 22L. The motor 10 is a three-phase synchronous machine and includes star-connected armature windings 11 of U, V, and W phases, and a rotor (not shown). The armature windings 11 of each phase are arranged with an electrical angle offset of 120°. The motor 10 is, for example, a permanent magnet synchronous machine. The rotor is capable of transmitting power to the drive wheels of the vehicle CA. Therefore, the motor 10 serves as a source of torque for propelling the vehicle CA.

[0014] The inverter 20 includes three phases of series-connected upper-arm switches SWH and lower-arm switches SWL. An upper-arm diode DH, which is a freewheeling diode, is connected in antiparallel to the upper-arm switch SWH, and a lower-arm diode DL, which is also a freewheeling diode, is connected in antiparallel to the lower-arm switch SWL. In this embodiment, each of the switches SWH and SWL is an IGBT.

[0015] The inverter 20 includes a smoothing capacitor 21. A first end of a long high-potential electrical path 22H is connected to a high-potential terminal of the smoothing capacitor 21. A first end of a long low-potential electrical path 22L is connected to a low-potential terminal of the smoothing capacitor 21. The smoothing capacitor 21 may be provided outside the inverter 20.

[0016] In each phase, a first end of the armature winding 11 is connected to a connection point between the emitter, which is the low potential terminal of the upper arm switch SWH, and the collector, which is the high potential terminal of the lower arm switch SWL, via a conductive member 23 such as a bus bar. Second ends of the armature windings 11 of each phase are connected to each other at a neutral point. In this embodiment, the armature windings 11 of each phase are set to have the same number of turns. As a result, the armature windings 11 of each phase are set to have the same inductance, for example.

[0017] A high potential side electrical path 22H is connected to the collector of the upper arm switch SWH of each phase, and a low potential side electrical path 22L is connected to the emitter of the lower arm switch SWL of each phase.

[0018] The system includes a first storage battery 31 (corresponding to the "first power storage unit") and a second storage battery 32 (corresponding to the "second power storage unit"). Each storage battery 31, 32 serves as a power supply source for rotating the rotor of the motor 10. Each storage battery 31, 32 is an assembled battery configured as a series connection of battery cells, which are single cells. The positive terminal of the first storage battery 31 is connected to a second end of the high-potential side electrical path 22H opposite the connection point of the smoothing capacitor 21, and the negative terminal of the second storage battery 32 is connected to a second end of the low-potential side electrical path 22L opposite the connection point of the smoothing capacitor 21. The terminal voltages (e.g., rated voltages) of the battery cells constituting the assembled battery are set to be the same, for example. The battery cells are, for example, secondary batteries such as lithium-ion batteries.

[0019] The first and second storage batteries 31, 32 can be charged by an external charger (described later) provided outside the vehicle CA. The external charger is, for example, a stationary charger. A positive electrode side connection part to which a positive terminal of the external charger can be connected is provided at a first end of the high-potential side electrical path 22H. A negative electrode side connection part to which a negative terminal of the external charger can be connected is provided at a first end of the low-potential side electrical path 22L.

[0020] The power conversion device includes main switches for electrically connecting or disconnecting the first and second storage batteries 31, 32 from the inverter 20. Specifically, the main switches include a high-side main switch SMRH and a low-side main switch SMRL. In this embodiment, the main switches SMRH and SMRL are mechanical relays. When turned off, the main switches SMRH and SMRL block bidirectional current flow, and when turned on, allow bidirectional current flow. The high-side main switch SMRH is provided in the high-side electrical path 22H, and the low-side main switch SMRL is provided in the low-side electrical path 22L. The main switches SMRH and SMRL are not limited to mechanical relays and may be, for example, semiconductor switching elements.

[0021] The power conversion device includes an inter-battery switch 40, a negative-electrode bypass switch 50, and a motor-side switch 60. In this embodiment, the inter-battery switch 40, the negative-electrode bypass switch 50, and the motor-side switch 60 are mechanical relays. When turned off, the inter-battery switch 40, the negative-electrode bypass switch 50, and the motor-side switch 60 block bidirectional current flow, and when turned on, allow bidirectional current flow. Note that the inter-battery switch 40, the negative-electrode bypass switch 50, and the motor-side switch 60 are not limited to mechanical relays and may be, for example, semiconductor switching elements.

[0022] The inter-battery switch 40 is provided in an inter-battery electrical path 24 (corresponding to an "inter-power storage unit electrical path") that connects the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32. When the inter-battery switch 40 is turned on, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically connected. On the other hand, when the inter-battery switch 40 is turned off, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically disconnected.

[0023] The negative electrode bypass switch 50 connects the negative electrode terminal of the first storage battery 31 and the low potential side electrical path 22L. When the negative electrode bypass switch 50 is turned on, the negative electrode terminal of the first storage battery 31 and the negative electrode terminal of the second storage battery 32 are electrically connected. On the other hand, when the negative electrode bypass switch 50 is turned off, the negative electrode terminal of the first storage battery 31 and the negative electrode terminal of the second storage battery 32 are electrically disconnected.

[0024] The motor-side switch 60 is provided on a motor-side electrical path 25 that connects the second storage battery 32 side of the inter-battery switch 40 in the inter-battery electrical path 24 with the neutral point of the armature winding 11. When the motor-side switch 60 is turned on, the neutral point of the armature winding 11 is electrically connected to the positive terminal of the second storage battery 32. When the motor-side switch 60 is turned off, the neutral point of the armature winding 11 is electrically disconnected from the positive terminal of the second storage battery 32.

[0025] The power conversion device includes a first voltage sensor 71 that detects the terminal voltage of the first storage battery 31 and a second voltage sensor 72 that detects the terminal voltage of the second storage battery 32. The power conversion device includes a first current sensor 73 that detects the current flowing to the first storage battery 31 and a second current sensor 74 that detects the current flowing to the second storage battery 32. The power conversion device also includes a first temperature sensor 75 that detects the temperature of the first storage battery 31 and a second temperature sensor 76 that detects the temperature of the second storage battery 32. The power conversion device also includes other sensors, such as a rotation angle sensor that detects the rotation angle (electrical angle) of the rotor and phase current sensors that detect phase currents flowing through the armature windings 11 of each phase.

[0026] The detected values ​​of each sensor are input to a control device 100 (corresponding to a "controller") included in the power conversion device. The control device 100 is mainly configured with a microcomputer 101, which includes a CPU. The functions provided by the microcomputer 101 can be provided by software recorded in a physical memory device and a computer executing the software, software alone, hardware alone, or a combination thereof. For example, if the microcomputer 101 is provided by a hardware electronic circuit, the function can be provided by a digital circuit including multiple logic circuits or an analog circuit. For example, the microcomputer 101 executes a program stored in a non-transitory tangible storage medium serving as a memory unit included in the microcomputer 101. The program includes, for example, programs for the processes shown in Figures 7 and 13 (described later). Execution of the program results in the execution of a method corresponding to the program. The memory unit is, for example, a non-volatile memory. The program stored in the memory unit can be updated via a communication network such as the Internet, for example, via OTA (Over the Air).

[0027] The control device 100 performs switching control of the switches SWH and SWL constituting the inverter 20 to feedback-control the control variable of the motor 10 to a target value based on the detection values ​​of the sensors. The control variable is, for example, torque. In each phase, the upper arm switch SWH and the lower arm switch SWL are alternately turned on. This feedback control transmits the rotational power of the rotor to the drive wheels of the vehicle CA, causing the vehicle CA to travel.

[0028] In this embodiment, the first and second storage batteries 31, 32 have the same rated voltage (e.g., 400 V). The power conversion device includes a first electric device 80 and a second electric device 90 as high-voltage auxiliary devices that can use the storage batteries as a power supply source. Each of the electric devices 80, 90 is driven and controlled by a control device 100. Each of the electric devices 80, 90 may be a single electric device or multiple electric devices.

[0029] A high-potential side terminal of the first electrical device 80 is connected to the high-potential side electrical path 22H, and a low-potential side terminal (ground terminal) of the first electrical device 80 is connected to the inter-battery electrical path 24. As a result, the first electrical device 80 is electrically connected in parallel to the first storage battery 31. The first electrical device 80 operates by receiving power from, for example, the first storage battery 31.

[0030] In this embodiment, the allowable input voltage of the first electrical device 80 is lower than the sum of the terminal voltages (e.g., rated voltages) of the first storage battery 31 and the second storage batteries 31, 32. The allowable input voltage is, for example, the maximum input voltage that can be supplied to the electrical device. As shown in FIG. 2 , the first electrical device 80 in this embodiment includes a first DC-DC converter 81. The first DC-DC converter 81 has a function of stepping down the input voltage and supplying it to the low-voltage storage battery 110 of the in-vehicle low-voltage system and the control device 100, and functions as a discharge device that discharges the first storage battery 31. The low-voltage storage battery 110 is a storage battery whose rated voltage (e.g., 12 V) is lower than the rated voltages of the first and second storage batteries 31, 32. The control device 100 operates using power supplied from at least one of the low-voltage storage battery 110 and the first DC-DC converter 81. The first DC-DC converter 81 also has a function of boosting the voltage input from the low-voltage storage battery 110 and outputting the boosted voltage to the storage battery, and also functions as a charging device that charges the storage battery. In other words, the first DC-DC converter 81 is a bidirectional DC-DC converter. The first electrical device 80 can further include, for example, an electric compressor and a heater that constitute an interior air conditioning system.

[0031] In practice, the inverter 20 and the electrical devices 80, 90 may be driven and controlled by separate control devices. However, in this embodiment, for convenience, these control devices are collectively shown as a single control device 100 in Figures 1 and 2, etc.

[0032] Returning to the description of FIG. 1 , the high-potential side terminal of the second electrical device 90 is connected to the high-potential side electrical path 22H via the cutoff switch 55. The low-potential side terminal (ground terminal) of the second electrical device 90 is connected to the low-potential side electrical path 22L. In this embodiment, the cutoff switch 55 is a mechanical relay. When the cutoff switch 55 is turned off by the control device 100, it blocks the flow of current in both directions, and when the cutoff switch 55 is turned on by the control device 100, it allows the flow of current in both directions. Note that the cutoff switch 55 is not limited to a mechanical relay and may be, for example, a semiconductor switching element.

[0033] In this embodiment, the allowable input voltage of the second electrical device 90 is the same voltage (e.g., 400 V) as the allowable input voltage of the first electrical device 80. As shown in Fig. 2 , the second electrical device 90 in this embodiment includes a second DC-DC converter 91 and an on-board charger 92 (corresponding to an "internal charger"). The second DC-DC converter 91 has a function of stepping down the input voltage and supplying it to the low-voltage storage battery 110 of the on-board low-voltage system and the control device 100, and functions as a discharge device that discharges the second storage battery 32.

[0034] The on-board charger 92 charges the storage battery by converting AC voltage supplied from an AC power supply 220 (see FIG. 11 ) provided outside the vehicle CA into DC voltage and supplying the DC voltage to the storage battery. The AC power supply 220 is, for example, a stationary power supply. The on-board charger 92 is an interface for connecting to the AC power supply 220, and the AC power supply 220 is connected to the on-board charger 92 by, for example, a user or an operator. The on-board charger 92 includes a rectifier circuit that converts the AC voltage input from the external AC power supply 220 into a DC voltage, and a transformer circuit that transforms and outputs the DC voltage output from the rectifier circuit.

[0035] The positive electrode connection portion of the high-potential electrical path 22H and the negative electrode connection portion of the low-potential electrical path 22L are interfaces for connecting to an external charger. For example, the external charger is connected to each connection portion by a user or an operator.

[0036] In this embodiment, the operation states of the inter-battery switch 40, the negative electrode bypass switch 50, the motor-side switch 60, and the cutoff switch 55 are switched depending on the control mode of the vehicle CA. Each control mode will be described below.

[0037] FIG. 3 shows the operation state of each switch in the high-voltage DC charging mode. When the control device 100 determines that a high-voltage DC charger 200 is connected to each connection as an external charger, it determines that the control mode is the high-voltage DC charging mode. The DC charging voltage output from the high-voltage DC charger 200 is the same as the inter-terminal voltage (specifically, the rated voltage) of the series-connected first and second storage batteries 31, 32, e.g., 800 V. In the high-voltage DC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the negative-electrode bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH, SWL of the inverter 20. This results in the first storage battery 31 and the second storage battery 32 being connected in series to the high-voltage DC charger 200. As a result, current flows through a closed circuit including the high-voltage DC charger 200, the high-potential side electrical path 22H, the first storage battery 31, the inter-battery switch 40, the second storage battery 32, and the low-potential side electrical path 22L, thereby charging the first storage battery 31 and the second storage battery 32. At this time, because the upper arm switch SWH and the motor-side switch 60 of the inverter 20 are turned off, it is possible to prevent the charging current of the high-voltage DC charger 200 from flowing to the inverter 20 and the armature winding 11.

[0038] Furthermore, the control device 100 turns off the cutoff switch 55 in the high-voltage DC charging mode. When the inter-battery switch 40 is turned on, the voltage difference between the high-potential side electrical path 22H and the low-potential side electrical path 22L exceeds the allowable input voltage of the second electric device 90. Therefore, to avoid a situation in which the second electric device 90 breaks down, the cutoff switch 55 is turned off. Meanwhile, the control device 100 permits operation of the first electric device 80 in the high-voltage DC charging mode. Therefore, the control device 100 operates the first electric device 80 when there is a request to operate the first electric device 80, thereby avoiding a situation in which both the first and second electric devices 80, 90 cannot operate in the high-voltage DC charging mode. This increases redundancy in the operation of the electric devices.

[0039] Since the first DCDC converter 81 of the first electrical device 80 can be operated in the high-voltage DC charging mode, power can be supplied from the first storage battery 31, which has a relatively large storage capacity, to the low-voltage storage battery 110, which has a relatively small storage capacity, and to the control device 100 via the first DCDC converter 81. This makes it possible to maintain an appropriate power supply to the control device 100 in the high-voltage DC charging mode. Note that if the low-voltage system does not include the low-voltage storage battery 110, the advantage of being able to supply power from the first storage battery 31 to the control device 100 via the first DCDC converter 81 is even greater.

[0040] 4 shows the operation state of each switch in the running mode of the vehicle CA. For example, when the control device 100 determines that the start switch of the vehicle CA has been turned on by the user, it determines that the control mode is the running mode. In the running mode, the control device 100 turns on the inter-battery switch 40 and turns off the negative electrode bypass switch 50 and the motor-side switch 60. The control device 100 also alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0041] Furthermore, in the traveling mode, the control device 100 turns off the cutoff switch 55 to prohibit the operation of the second electric device 90. This makes it possible to avoid a situation in which the second electric device 90 breaks down. On the other hand, the control device 100 permits the operation of the first electric device 80 in the traveling mode. Therefore, the control device 100 operates the first electric device 80 when there is a request to operate the first electric device 80, thereby avoiding a situation in which both the first and second electric devices 80, 90 cannot operate in the traveling mode. This makes it possible to increase redundancy regarding the operation of the electric devices.

[0042] Since the first DC-DC converter 81 can be operated in the traveling mode, power can be supplied from the first storage battery 31, which has a relatively large storage capacity, to the low-voltage storage battery 110, which has a relatively small storage capacity, and to the control device 100 via the first DC-DC converter 81. This makes it possible to properly maintain the power supply to the control device 100 in the traveling mode. As a result, the control device 100 can continue to control the drive of the motor 10, and it is possible to avoid a situation in which the vehicle CA cannot travel. Note that if the low-voltage system is not equipped with the low-voltage storage battery 110, the advantage of being able to supply power from the first storage battery 31 to the control device 100 via the first DC-DC converter 81 to enable the vehicle CA to travel is even greater.

[0043] In the running mode, in addition to using both the first and second storage batteries 31, 32 as the drive power source for the motor 10 as shown in Figure 4, a one-sided mode can be implemented in which only one of the first and second storage batteries 31, 32 is used as the drive power source, as shown in Figures 5, 6, and 7. Figure 5 shows the operation state of each switch in one-sided mode 1. In one-sided mode 1, the control device 100 turns off the inter-battery switch 40 and the motor-side switch 60 and turns on the negative-electrode bypass switch 50. In addition, the control device 100 alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to generate torque in the motor 10 and run the vehicle CA.

[0044] Furthermore, in one-sided mode 1, the control device 100 turns on the cutoff switch 55. This allows power to be supplied from the first storage battery 31 to the first and second electric devices 80, 90, and the control device 100 therefore permits the first and second electric devices 80, 90 to operate.

[0045] 6 shows the operation state of each switch in single-sided mode 2. In single-sided mode 2, the control device 100 turns off the inter-battery switch 40 and the negative-electrode bypass switch 50, and turns on the motor-side switch 60. In addition, the control device 100 alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0046] Furthermore, in one-sided mode 2, the control device 100 turns on the cutoff switch 55. This allows power to be supplied from the first storage battery 31 to the first electrical device 80 and from the second storage battery 32 to the second electrical device 90, so the control device 100 permits the operation of the first and second electrical devices 80, 90.

[0047] 7 shows the operation state of each switch in single-sided mode 3. In single-sided mode 3, the control device 100 turns off the negative electrode bypass switch 50 and the low potential side main switch SMRL, and turns on the battery switch 40 and the motor side switch 60. In addition, the control device 100 alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0048] Furthermore, in one-sided mode 3, the control device 100 allows the first electric device 80 to operate because power can be supplied from the first storage battery 31 to the first electric device 80. On the other hand, in one-sided mode 3, the control device 100 turns off the cutoff switch 55. This is to prevent the voltage of the series-connected body of the first and second storage batteries 31, 32 from being applied to the second electric device 90, which could cause the second electric device 90 to malfunction.

[0049] 8 shows the operation state of each switch in the parking mode of vehicle CA. For example, when the control device 100 determines that the start switch of vehicle CA has been turned off by the user, it determines that the control mode is parking mode. In parking mode, the control device 100 turns off the inter-battery switch 40, the negative pole bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20. In addition, in parking mode, the control device 100 turns off the cutoff switch 55 to prohibit operation of the second electrical device 90. The operation is prohibited because the inter-battery switch 40 is turned off in parking mode, preventing power from being supplied to the second electrical device 90 from the first and second storage batteries 31 and 32.

[0050] 9 shows the operation state of each switch in the series neutral point mode. In the series neutral point mode, the inter-battery switch 40 and the motor-side switch 60 are turned on, and the negative-electrode bypass switch 50 is turned off. In the series neutral point mode, the control device 100 turns off the cutoff switch 55. This prevents the second electric device 90 from failing. Meanwhile, the operation of the first electric device 80 is permitted.

[0051] In the series neutral point mode, the control device 100 switches the inverter 20 based on the detected values ​​of the first and second current sensors 73 and 74 and the first and second voltage sensors 71 and 72, thereby transmitting power from one of the first and second storage batteries 31 and 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. In this switching, the upper and lower arm switches SWH and SWL are alternately turned on for at least one phase. As a result, when, for example, a traveling mode is selected, the vehicle CA can be traveled while equalizing the states of charge (SOC) of the first and second storage batteries 31 and 32.

[0052] FIG. 10 shows the procedure of the process of controlling the operating state of the electrical appliances executed by the control device 100.

[0053] In step S10, it is determined whether the current control mode is the high voltage DC charging mode, the running mode, or the parking mode.

[0054] If it is determined in step S10 that the current control mode is any one of the high-voltage DC charging mode, the driving mode, or the parking mode, the process proceeds to step S11, where the cutoff switch 55 is turned off to prohibit the operation of the second electric device 90. Furthermore, the operation of the first electric device 80 is permitted.

[0055] The control modes will be further explained. First, the operation state of each switch in the low-voltage DC charging mode will be explained. There are three low-voltage DC charging modes.

[0056] FIG. 11 shows the operation state of each switch in mode 1. When the control device 100 determines that a low-voltage DC charger 210 is connected to each connection as an external charger, it determines that the control mode is the low-voltage DC charging mode. The DC charging voltage output from the low-voltage DC charger 210 is the same as the rated voltage of the first and second storage batteries 31, 32, e.g., 400 V. In mode 1 of the low-voltage DC charging mode, the control device 100 turns off the inter-battery switch 40, the motor-side switch 60, and the upper and lower arm switches SWH, SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, of the first and second storage batteries 31, 32, only the first storage battery 31 (corresponding to the "target power storage unit") is charged by the low-voltage DC charger 210. In mode 1, the second storage battery 32 is not charged.

[0057] Furthermore, in mode 1, the control device 100 turns on the cutoff switch 55. This enables power supply from the first storage battery 31 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0058] 12 shows the operation state of each switch in mode 2. In mode 2, the control device 100 turns off the inter-battery switch 40, the negative-electrode bypass switch 50, and the lower-arm switch SWL of the inverter 20, and turns on the motor-side switch 60 and at least one phase upper-arm switch SWH of the inverter 20. As a result, of the first and second storage batteries 31, 32, only the second storage battery 32 is charged by the low-voltage DC charger 210. At this time, the charging current from the low-voltage DC charger 210 flows through the upper-arm switch SWH, the conductive member 23, the armature winding 11, and the motor-side electrical path 25. In mode 2, the first storage battery 31 is not charged.

[0059] Furthermore, in mode 2, the control device 100 turns on the cutoff switch 55. This enables power supply from the second storage battery 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0060] FIG. 13 shows the operation state of each switch in mode 3. In mode 3, the control device 100 turns off the inter-battery switch 40 and turns on the negative electrode bypass switch 50 and the motor-side switch 60. In mode 3, the control device 100 can individually adjust the charging power of the first storage battery 31 and the second storage battery 32 based on the detected values ​​of the first and second current sensors 73 and 74 and the first and second voltage sensors 71 and 72. This adjustment can be performed by alternately turning on the upper and lower arm switches SWH and SWL for at least one phase of the inverter 20, or by repeatedly turning on and off the upper arm switch SWH for at least one phase and turning off the lower arm switch SWL, while outputting a charging current from the low-voltage DC charger 210. Here, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted by adjusting the duty ratio (Ton / Tsw), which is the ratio of the on period Ton of the upper arm switch SWH to one switching period Tsw. According to mode 3, both the first and second storage batteries 31 and 32 can be charged.

[0061] Furthermore, in mode 3, the control device 100 turns on the cutoff switch 55. This enables power supply from the first and second storage batteries 31, 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0062] FIG. 14 shows the operation state of each switch in the low-voltage AC charging mode. When the control device 100 determines that the on-board charger 92 is connected to an external AC power supply 220 and that a low-voltage charging request has been made, it determines that the control mode is the low-voltage AC charging mode. In the low-voltage AC charging mode, the control device 100 controls the drive of the on-board charger 92 so that the charging voltage output from the on-board charger 92 to the first storage battery 31 becomes the same voltage as that of the first storage battery 31. In the low-voltage AC charging mode, the control device 100 turns off the inter-battery switch 40, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, of the first and second storage batteries 31, 32, only the first storage battery 31 is charged by the on-board charger 92.

[0063] Furthermore, in the low-voltage AC charging mode, the control device 100 turns on the cutoff switch 55. This enables power supply from the first storage battery 31 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0064] The operational states of the inter-battery switch 40, the negative electrode bypass switch 50, the motor-side switch 60, and the inverter 20 in the low-voltage AC charging mode shown in FIG. 14 correspond to mode 1 shown in FIG. 8 . Alternatively, the operational states in the low-voltage AC charging mode may correspond to mode 2 shown in FIG. 12 or mode 3 shown in FIG. 13 . In the operational state corresponding to mode 2, only the second storage battery 32 of the first and second storage batteries 31, 32 is charged by the on-board charger 92. In the operational state corresponding to mode 3, the control device 100 can charge both the first and second storage batteries 31, 32 by the on-board charger 92. In this case, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted by adjusting the duty ratio (Ton / Tsw), which is the ratio of the on-period Ton of the upper arm switch SWH to one switching period Tsw.

[0065] 15 shows the operation state of each switch in the battery heating mode. When the control device 100 determines that the battery temperature Tbat is lower than the target temperature Tth, it determines that the control mode is the heating mode. The battery temperature Tbat may be set to the lower of the temperature of the first storage battery 31 detected by the first temperature sensor 75 (hereinafter referred to as the first detected temperature TA) and the temperature of the second storage battery 32 detected by the second temperature sensor 76 (hereinafter referred to as the second detected temperature TB), for example.

[0066] In the temperature rise mode, the control device 100 turns off the inter-battery switch 40 and the low-potential-side main switch SMRL, and turns on the negative electrode bypass switch 50 and the motor-side switch 60. The control device 100 switches on the inverter 20 so that AC charging / discharging current flows between the first storage battery 31 and the second storage battery 32 via the armature winding 11 and the inverter 20, for example, until the battery temperature Tbat reaches the target temperature Tth. This switching involves alternately turning on the upper and lower arm switches SWH and SWL in at least one phase. The temperature rise mode can promote heat generation due to the internal resistance of the batteries, thereby raising the temperatures of the first and second storage batteries 31 and 32. This increases the maximum charging power of the first and second storage batteries 31 and 32, and shortens the charging time of the first and second storage batteries 31 and 32 while the vehicle CA is parked, for example.

[0067] Furthermore, in the temperature increase mode, the control device 100 turns on the cutoff switch 55. This allows both the first and second electric devices 80, 90 to operate.

[0068] FIG. 16 shows the procedure of the process of controlling the operating state of the electrical appliances executed by the control device 100.

[0069] In step S20, it is determined whether the current control mode is the low-voltage DC charging mode, the low-voltage AC charging mode, or the temperature increase mode.

[0070] If it is determined in step S20 that the current control mode is either the low-voltage DC charging mode, the low-voltage AC charging mode, or the temperature rise mode, the process proceeds to step S21, the cut-off switch 55 is turned on, and the operation of the first and second electrical devices 80, 90 is permitted.

[0071] According to the present embodiment described above, it is possible to provide a power conversion device with improved redundancy.

[0072] Modification of the First Embodiment When the control device 100 determines that the difference between the terminal voltage of the first storage battery 31 detected by the first voltage sensor 71 (hereinafter referred to as the first detected voltage VA) and the terminal voltage of the second storage battery 32 detected by the second voltage sensor 72 (hereinafter referred to as the second detected voltage VB) exceeds the determination threshold ΔVjde, the control device 100 may forcibly increase the power consumption of the first electrical device 80 so that the difference between the first detected voltage VA and the second detected voltage VB approaches zero. This allows the terminal voltages of the first and second storage batteries 31, 32 to be equalized. The determination threshold ΔVjde is a value smaller than the rated voltages of the storage batteries 31, 32. The determination threshold ΔVjde is set to, for example, 1 / 10, 1 / 20, 1 / 50, or 1 / 100 of the lower of the rated voltages of the storage batteries 31, 32.

[0073] The rated voltage of the first storage battery 31 (e.g., 400 V) may be higher than the rated voltage of the second storage battery 32 (e.g., 200 V). In this case, for example, the allowable input voltage of the first electrical device 80 may be set to the same voltage as the rated voltage of the first storage battery 31, and the allowable input voltage of the second electrical device 90 may be set to the same voltage as the rated voltage of either the first or second storage battery 31, 32. Note that when the rated voltage of the first storage battery 31 differs from the rated voltage of the second storage battery 32, and the control device 100 determines that the value obtained by subtracting the second detection voltage VB from the first detection voltage VA exceeds the voltage threshold Vj, the control device 100 may forcibly increase the power consumption of the first electrical device 80 so that the difference between the first detection voltage VA and the second detection voltage VB approaches a specified value. Here, the voltage threshold Vj may be set to a voltage difference between the first storage battery 31 and the second storage battery 32 such that the maximum and steady-state values ​​of the inrush current determined from the relationship between the impedance of the current path between the first storage battery 31 and the second storage battery 32 (specifically, for example, the impedance of the first and second storage batteries 31, 32, the impedance of the inverter 20 and the armature winding 11, and the forward impedance of the diode of the inverter 20) and the voltage difference between the first storage battery 31 and the second storage battery 32 are equal to or less than a permissible value when the motor-side switch 60 is turned on. Here, the permissible value is, for example, the maximum current that components on the current path can safely withstand. The specified value may be set to the same value as the voltage threshold Vj or to a value smaller than the voltage threshold Vj.

[0074] The cutoff switch 55 may not be provided, and the high-potential side terminal of the second electric device 90 may be constantly connected to the high-potential side electrical path 22H. In this case, the control device 100 may perform a process of prohibiting the operation of the second electric device 90 in step S11 of FIG.

[0075] Second Embodiment The second embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, the allowable input voltage of the second electrical device 90 is higher than the allowable input voltage of the first electrical device 80 and is the same voltage (e.g., 800 V) as the sum of the terminal voltages (e.g., rated voltages) of the first storage battery 31 and the second storage batteries 31, 32. In other words, the second electrical device 90 has a high voltage resistance.

[0076] FIG. 17 shows the operation states of each switch when the control mode is the high-voltage AC charging mode. When the control device 100 determines that the AC power source 220 is connected to the on-board charger 92 and that a high-voltage charging request has been made, it determines that the control mode is the high-voltage AC charging mode. In the high-voltage AC charging mode, the control device 100 controls the on-board charger 92 so that the charging voltage output from the on-board charger 92 to the first and second storage batteries 31, 32 is equal to the rated voltage of the series-connected first and second storage batteries 31, 32. In the high-voltage AC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the negative-electrode bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH, SWL of the inverter 20. This allows both the first and second storage batteries 31, 32 to be charged by the on-board charger 92.

[0077] Furthermore, in the high-voltage AC charging mode, the control device 100 turns on the cutoff switch 55 and permits operation of both the first electric device 80 and the second electric device 90. The reason why operation of the second electric device 90 is permitted is because the allowable input voltage of the second electric device 90 is the same as the sum of the rated voltages of the first and second storage batteries 31, 31, 32.

[0078] FIG. 18 shows the procedure of the process of controlling the operating state of the electrical appliances executed by the control device 100.

[0079] In step S30, it is determined whether the current control mode is the parking mode.

[0080] If it is determined in step S30 that the current control mode is the parking mode, the process proceeds to step S31, where the cutoff switch 55 is turned off to prohibit the operation of the second electric device 90. Furthermore, the operation of the first electric device 80 is permitted.

[0081] On the other hand, if it is determined in step S30 that the current control mode is not the parking mode, the process proceeds to step S32, where it is determined whether the current control mode is the high-voltage DC charging mode, the high-voltage AC charging mode, or the driving mode.

[0082] If it is determined in step S32 that the current control mode is either the high-voltage DC charging mode, the high-voltage AC charging mode, or the driving mode, the process proceeds to step S33, the cut-off switch 55 is turned on, and the operation of the first and second electrical devices 80, 90 is permitted.

[0083] FIG. 19 shows the operation state of each switch in the series neutral point mode. In the series neutral point mode, the control device 100 turns off the low-side main switch SMRL and turns on the cutoff switch 55. In this case, when the control mode is set to the traveling mode, the control device 100 permits operation of the first and second electric devices 80, 90 and can switch the inverter 20 so that only the first storage battery 31 of the first and second storage batteries 31, 32 serves as the drive power source for the motor 10. The control device 100 can also control the temperature rise of the first and second storage batteries 31, 32 by switching the inverter 20. When the control mode shown in FIG. 18 is selected, the control device 100 simply performs the process of step S33 in FIG. 18.

[0084] Third Embodiment A third embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in Fig. 20 , a first electrical device 80 is electrically connected in parallel with a second storage battery 32 (corresponding to a "target power storage unit") rather than with a first storage battery 31. The rated voltage of the first storage battery 31 (e.g., 400 V) is set to be equal to or higher than the rated voltage of the second storage battery 32 (e.g., 200 V).

[0085] Next, each control mode of this embodiment will be described.

[0086] 21 shows the operating states of each switch in the high-voltage DC charging mode. In the high-voltage DC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the negative-electrode bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH, SWL of the inverter 20. This causes the first and second storage batteries 31, 32 to be charged.

[0087] Furthermore, the control device 100 turns off the cutoff switch 55 in the high-voltage DC charging mode, thereby avoiding a situation in which the second electric device 90 breaks down. Meanwhile, the control device 100 permits operation of the first electric device 80 in the high-voltage DC charging mode. Therefore, when there is a request to operate the first electric device 80, the control device 100 operates the first electric device 80 using the second storage battery 32 as a power supply source, thereby avoiding a situation in which both the first and second electric devices 80, 90 cannot operate in the high-voltage DC charging mode.

[0088] Since the first DCDC converter 81 of the first electrical device 80 can be operated in the high-voltage DC charging mode, power can be supplied from the first storage battery 31, which has a relatively large storage capacity, to the low-voltage storage battery 110, which has a relatively small storage capacity, and to the control device 100 via the first DCDC converter 81. This makes it possible to maintain an appropriate power supply to the control device 100 in the high-voltage DC charging mode. Note that if the low-voltage system does not include the low-voltage storage battery 110, the advantage of being able to supply power from the first storage battery 31 to the control device 100 via the first DCDC converter 81 is even greater.

[0089] 22 shows the operation state of each switch in the running mode of the vehicle CA. In the running mode, the control device 100 turns on the inter-battery switch 40 and turns off the negative electrode bypass switch 50 and the motor-side switch 60. The control device 100 also alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0090] Furthermore, in the traveling mode, the control device 100 turns off the cutoff switch 55 to prohibit the operation of the second electric device 90. This makes it possible to avoid a situation in which the second electric device 90 breaks down. On the other hand, in the traveling mode, the control device 100 permits the operation of the first electric device 80.

[0091] Since the first DC-DC converter 81 can be operated in the traveling mode, power can be supplied from the first storage battery 31, which has a relatively large storage capacity, to the low-voltage storage battery 110, which has a relatively small storage capacity, and to the control device 100 via the first DC-DC converter 81. This makes it possible to properly maintain the power supply to the control device 100 in the traveling mode. As a result, the control device 100 can continue to control the drive of the motor 10, and it is possible to avoid a situation in which the vehicle CA cannot travel. Note that if the low-voltage system is not equipped with the low-voltage storage battery 110, the advantage of being able to supply power from the first storage battery 31 to the control device 100 via the first DC-DC converter 81 to enable the vehicle CA to travel is even greater.

[0092] In addition, the control device 100 can implement the one-side modes 1 to 3 described in the first embodiment in the running mode.

[0093] 23 shows the operation states of each switch in the parking mode of vehicle CA. In the parking mode, the control device 100 turns off the inter-battery switch 40, the negative electrode bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH, SWL of the inverter 20. In the parking mode, the control device 100 also turns off the cutoff switch 55 to prohibit operation of the second electric device 90.

[0094] 24 shows the operation state of each switch in the series neutral point mode. In the series neutral point mode, the control device 100 turns off the cutoff switch 55. This prevents the second electric device 90 from failing. Meanwhile, the operation of the first electric device 80 is permitted.

[0095] In the series neutral point mode, the control device 100 switches the inverter 20 based on the detected values ​​of the first and second current sensors 73 and 74 and the first and second voltage sensors 71 and 72, thereby transmitting power from one of the first and second storage batteries 31 and 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. In this switching, the upper and lower arm switches SWH and SWL are alternately turned on for at least one phase. As a result, when, for example, a traveling mode is selected, the vehicle CA can be traveled while equalizing the states of charge (SOC) of the first and second storage batteries 31 and 32.

[0096] The control device 100 performs the same operation state control process as that shown in FIG.

[0097] Next, the operation states of the switches in the three low-voltage DC charging modes will be described.

[0098] 25 shows the operation state of each switch in mode 1. In mode 1 of the low-voltage DC charging mode, the control device 100 turns off the inter-battery switch 40, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20, and turns on the negative-electrode bypass switch 50. As a result, of the first and second storage batteries 31 and 32, only the first storage battery 31 is charged by the low-voltage DC charger 210. Furthermore, in mode 1, the control device 100 turns on the cutoff switch 55. As a result, power can be supplied from the first storage battery 31 to the second electric device 90, and operation of the second electric device 90 is permitted. Therefore, both the first and second electric devices 80 and 90 can be operated.

[0099] 26 shows the operation state of each switch in mode 2. In mode 2, the control device 100 turns off the inter-battery switch 40, the negative-electrode bypass switch 50, and the lower arm switch SWL of the inverter 20, and turns on the motor-side switch 60 and at least one phase upper arm switch SWH of the inverter 20. As a result, of the first and second storage batteries 31, 32, only the second storage battery 32 is charged by the low-voltage DC charger 210. Furthermore, in mode 2, the control device 100 turns on the cutoff switch 55. As a result, power can be supplied from the second storage battery 32 to the second electric device 90, and operation of the second electric device 90 is permitted. Therefore, both the first and second electric devices 80, 90 can be operated.

[0100] 27 shows the operation state of each switch in mode 3. In mode 3, the control device 100 turns off the inter-battery switch 40 and turns on the negative electrode bypass switch 50 and the motor-side switch 60. In mode 3, similar to the first embodiment, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted based on the detection values ​​of the first and second current sensors 73, 74 and the first and second voltage sensors 71, 72.

[0101] Furthermore, in mode 3, the control device 100 turns on the cutoff switch 55. This enables power supply from the first and second storage batteries 31, 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0102] FIG. 28 shows the operating state of each switch in the low-voltage AC charging mode. In the low-voltage AC charging mode, the control device 100 turns off the inter-battery switch 40, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, of the first and second storage batteries 31 and 32, only the first storage battery 31 is charged by the on-board charger 92. In addition, in the low-voltage AC charging mode, the control device 100 turns on the cutoff switch 55. This enables power supply from the first storage battery 31 to the second electric device 90, allowing the second electric device 90 to operate. Therefore, both the first and second electric devices 80 and 90 can operate.

[0103] The operational states of the inter-battery switch 40, inter-negative electrode bypass switch 50, motor-side switch 60, and inverter 20 in the low-voltage AC charging mode shown in Fig. 28 correspond to mode 1 shown in Fig. 25. In addition, the operational states in the low-voltage AC charging mode can also be the operational states corresponding to mode 2 shown in Fig. 26 or the operational states corresponding to mode 3 shown in Fig. 27, as in the first embodiment.

[0104] 29 shows the operation state of each switch in the temperature rise mode of the storage batteries. In the temperature rise mode, the control device 100 turns off the inter-battery switch 40 and the low-potential side main switch SMRL, and turns on the negative electrode bypass switch 50 and the motor-side switch 60. As in the first embodiment, the control device 100 switches on the inverter 20 so that AC charging / discharging current flows between the first storage battery 31 and the second storage battery 32 via the armature winding 11 and the inverter 20, for example, until the battery temperature Tbat reaches the target temperature Tth. In addition, in the temperature rise mode, the control device 100 turns on the cutoff switch 55. This allows operation of both the first and second electrical devices 80, 90.

[0105] The control device 100 performs the same operation state control process as that shown in FIG.

[0106] Incidentally, when the motor-side switch 60 is turned on, if the voltage across the second storage battery 32 is too high relative to the voltage across the first storage battery 31, a large current flows from the second storage battery 32 to the first storage battery 31 via the motor-side electrical path 25, the armature winding 11, the upper-arm diode DH connected in anti-parallel to the upper-arm switch SWH, and the high-potential-side electrical path 22H. In this case, the reliability of the power conversion device and the storage batteries 31, 32 may be reduced.

[0107] In order to prevent such a situation from occurring, in this embodiment, the rated voltage of the first storage battery 31 is set to a voltage equal to or higher than the rated voltage of the second storage battery 32 .

[0108] Discharge from the first and second storage batteries 31, 32 may increase the difference between the terminal voltage of the first storage battery 31 and the terminal voltage of the second storage battery 32. Therefore, the control device 100 adjusts the power consumption or operation frequency of the first electrical device 80 so that the absolute value of the difference between the first detected voltage VA and the second detected voltage VB is equal to or less than the voltage threshold Vj. Specifically, the control device 100 adjusts the power consumption or operation frequency of the first electrical device 80 so that the first detected voltage VA is equal to or greater than the second detected voltage VB and the absolute value of the difference is equal to or less than the specified value.

[0109] When adjusting the power consumption of the first electrical device 80, the control device 100 simply makes the power consumption of the first electrical device 80 greater than the power consumption of the second electrical device 90. Here, the power consumption of the first and second electrical devices 80, 90 refers to the total power consumption of the multiple electrical devices when there are multiple electrical devices. For example, the power consumption of the second electrical device 90 refers to the total power consumption of the second DC-DC converter 91, the on-board charger 92, and the like. By making the power consumption of the first electrical device 80 greater than the power consumption of the second electrical device 90, the discharge power of the second storage battery 32 becomes greater than the discharge power of the first storage battery 31, making it easier to achieve the relationship "|VA - VB| ≦ specified value."

[0110] Furthermore, when adjusting the operation frequency of the first electrical device 80, the control device 100 may set the operation frequency of the first electrical device 80 higher than the operation frequency of the second electrical device 90. Here, the operation frequency refers to the ratio (= Topr / Ttl) of the operation period Topr of the electrical device to the specified period Ttl. When the control mode is the high-voltage DC charging mode, the high-voltage AC charging mode, the low-voltage DC charging mode, or the low-voltage AC charging mode, the specified period Ttl is, for example, the execution period of each charging mode. When the control mode is the traveling mode, the specified period Ttl is, for example, one trip of the vehicle CA. One trip is, for example, the period from when the start switch of the vehicle CA is turned on by the user to when it is turned off. By setting the operation frequency of the first electrical device 80 higher than the operation frequency of the second electrical device 90, the total power consumption of the first electrical device 80 during the specified period Ttl is made larger than the total power consumption of the second electrical device 90 during the specified period Ttl. As a result, the relationship "|VA-VB|≦prescribed value" becomes easier to achieve.

[0111] <Modification of Third Embodiment> The rated voltage of the first storage battery 31 and the rated voltage of the second storage battery 32 may be the same.

[0112] The control device 100 may set the power consumption of the second electric device 90 to be smaller than the power consumption of the first electric device 80 .

[0113] The cutoff switch 55 may not be provided, and the high-potential side terminal of the second electrical device 90 may be constantly connected to the high-potential side electrical path 22H.

[0114] As in the second embodiment, the allowable input voltage of the second electric device 90 may be set to be higher than the allowable input voltage of the first electric device 80 and to be the same voltage (e.g., 800 V) as the sum of the terminal voltages (e.g., rated voltages) of the first storage battery 31 and the second storage batteries 31, 32. In this case, the control device 100 may perform the same operating state control process as in FIG. 18 .

[0115] 30 shows the operation states of the switches in the series neutral point mode in this case. In the series neutral point mode, the control device 100 turns off the low-side main switch SMRL and turns on the cutoff switch 55, as in the second embodiment. In this case, when the control mode is the traveling mode, the control device 100 permits the operation of the first and second electric devices 80, 90 and can perform switching of the inverter 20 using only the first storage battery 31 of the first and second storage batteries 31, 32 as the drive power source for the motor 10. The control device 100 can also perform temperature rise control of the first and second storage batteries 31, 32 by switching the inverter 20.

[0116] Fourth Embodiment The fourth embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in FIG. 31 , the second electrical device 90 is electrically connected in parallel to the second storage battery 32 (corresponding to the “target power storage unit”). The rated voltage of the first storage battery 31 is set to be equal to or higher than the rated voltage of the second storage battery 32, specifically, higher than the rated voltage of the second storage battery 32. The allowable input voltage of the second electrical device 90 is lower than the sum of the inter-terminal voltages (e.g., rated voltages) of the first storage battery 31 and the second storage battery 31, 32, and is the same as the allowable input voltage of the first electrical device 80, for example. The maximum power consumption P2max of the second electrical device 90 is lower than the maximum power consumption P1max of the first electrical device 80. When an electrical device is configured with multiple electrical devices, the maximum power consumption of the electrical device refers to the sum of the maximum power consumptions of the individual electrical devices.

[0117] FIG. 32 shows the procedure of the operation state control process executed by the control device 100.

[0118] In step S40, it is determined whether the vehicle CA is in a sleep state, which means that the control mode is, for example, a parking mode or a charging mode.

[0119] If it is determined in step S40 that the device is in the sleep state, the process proceeds to step S41, where operation of the first electrical device 80 is prohibited and operation of the second electrical device 90 is permitted. This is to improve the efficiency of the power conversion device. That is, a DC-DC converter as an electrical device has a characteristic that the smaller the difference between input and output voltages, the smaller the current (e.g., dark current) flowing through the DC-DC converter, and the higher the power conversion efficiency. Therefore, by operating the second DC-DC converter 91 connected to the second storage battery 32, which has a lower rated voltage of the first and second storage batteries 31, 32, the efficiency of the power conversion device can be improved.

[0120] Furthermore, since the second DC-DC converter 91 of the second electrical device 90 can be operated, power can be supplied from the second storage battery 32, which has a relatively large storage capacity, to the low-voltage storage battery 110, which has a relatively small storage capacity, and to the control device 100 via the second DC-DC converter 91. This makes it possible to maintain an appropriate power supply to the control device 100. Note that if the low-voltage system does not include the low-voltage storage battery 110, the advantage of being able to supply power from the second storage battery 32 to the control device 100 via the second DC-DC converter 91 is even greater.

[0121] The second electric device 90 is always connected to the second storage battery 32 without using a cutoff switch such as a relay. This eliminates the need to operate the cutoff switch in the sleep state, and allows power to be properly supplied from the second storage battery 32 to the second electric device 90.

[0122] When the motor-side switch 60 is turned on, if the voltage across the second storage battery 32 is too high relative to the voltage across the first storage battery 31, a large current may flow from the second storage battery 32 to the first storage battery 31 via the motor-side electrical path 25, the armature winding 11, the upper-arm diode DH, and the high-potential-side electrical path 22H. To address this problem, the control device 100 adjusts the power consumption or operation frequency of the second electrical device 90 so that the absolute value of the difference between the first detected voltage VA and the second detected voltage VB is equal to or less than the specified value. Specifically, the control device 100 adjusts the power consumption or operation frequency of the second electrical device 90 so that the first detected voltage VA is equal to or greater than the second detected voltage VB and the absolute value of the difference is equal to or less than the specified value. This adjustment can be performed using a method similar to that of the third embodiment.

[0123] When adjusting the power consumption of the second electric device 90, the control device 100 simply makes the power consumption of the second electric device 90 greater than the power consumption of the first electric device 80. Here, the power consumption of the first and second electric devices 80, 90 refers to the total power consumption of the plurality of electric devices when the electric device is made up of a plurality of electric devices. By making the power consumption of the second electric device 90 greater than the power consumption of the first electric device 80, the discharge power of the second storage battery 32 becomes greater than the discharge power of the first storage battery 31, making it easier to achieve the relationship "VA - VB ≦ specified value."

[0124] Furthermore, when adjusting the operation frequency of the first electric device 80, the control device 100 may set the operation frequency of the second electric device 90 higher than the operation frequency of the first electric device 80. Here, the operation frequency has the same definition as in the third embodiment. By setting the operation frequency of the second electric device 90 higher than the operation frequency of the first electric device 80, the total value of the power consumption of the second electric device 90 during the specified period Ttl is made larger than the total value of the power consumption of the first electric device 80 during the specified period Ttl. As a result, it becomes easier to achieve the relationship "VA - VB ≦ specified value."

[0125] Fig. 33 shows the procedure of the operation state control process executed by the control device 100. The process in Fig. 33 is executed when the vehicle CA is not in the sleep state but in the operation state.

[0126] In step S50, it is determined whether the vehicle CA is not in a sleep state and is in an operating state. For example, it is determined that the vehicle CA is in an operating state when the control device 100 is activated (for example, when the driving mode or one of the charging modes is selected).

[0127] If the determination in step S50 is affirmative, the process proceeds to step S51, where it is determined whether or not an abnormality has occurred in the first storage battery 31. If the determination in step S51 is that the first storage battery 31 is normal, the process proceeds to step S52, where it is determined whether or not an abnormality has occurred in the second storage battery 32.

[0128] If it is determined in step S52 that the second storage battery 32 is normal, the process proceeds to step S53, where the operation of the first and second electrical devices 80, 90 is permitted.

[0129] If it is determined in step S51 that an abnormality has occurred in the first storage battery 31, the process proceeds to step S54, where the operation of the first electrical device 80 is prohibited and the operation of the second electrical device 90 is permitted. Note that in step S54, the inter-battery switch 40 may be turned off.

[0130] If it is determined in step S52 that an abnormality has occurred in the second storage battery 32, the process proceeds to step S55, where the operation of the second electric device 90 is prohibited and the operation of the first electric device 80 is permitted. Note that in step S55, the inter-battery switch 40 may be turned off.

[0131] According to the processing shown in FIG. 33, for example, when the control mode is set to the driving mode, even if an abnormality occurs in either the first or second storage battery 31, 32, the drive control of the electrical equipment can be continued using the normal storage battery.

[0132] <Variation of the fourth embodiment> - In order to maintain the relationship "|VA-VB|≦specified value", the control device 100 may charge the first storage battery 31 from the low-voltage storage battery 110 using the first DC-DC converter 81 functioning as a charging device.

[0133] A breaker switch may be provided on the high potential terminal side of the first and second electrical devices 80 and 90 .

[0134] Fifth Embodiment A fifth embodiment will be described below with reference to the drawings, focusing on differences from the first embodiment. In this embodiment, as shown in Fig. 34 , the power conversion device includes a positive-electrode bypass switch 51, and does not include the negative-electrode bypass switch 50 shown in Fig. 1 . In addition, the motor-side electrical path 25 connects the neutral point of the armature winding 11 to a portion of the inter-battery electrical path 24 that is closer to the first storage battery 31 than the inter-battery switch 40. A motor-side switch 61 is provided in the motor-side electrical path 25.

[0135] The first electrical device 80 is electrically connected in parallel to the second storage battery 32 rather than the first storage battery 31 .

[0136] Next, each control mode will be described.

[0137] 35 shows the operating state of each switch in the high-voltage DC charging mode. In the high-voltage DC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the positive-electrode bypass switch 51, the motor-side switch 61, and the upper and lower arm switches SWH, SWL of the inverter 20. As a result, the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage DC charger 200, and the first and second storage batteries 31, 32 are charged. In addition, in the high-voltage DC charging mode, the control device 100 turns off the cutoff switch 55. This prevents the second electrical device 90 from breaking down.

[0138] On the other hand, in the high-voltage DC charging mode, the control device 100 permits operation of the first electric device 80. Therefore, when there is a request to operate the first electric device 80, the control device 100 operates the first electric device 80 using the second storage battery 32 as a power supply source, thereby avoiding the occurrence of a situation in which both the first and second electric devices 80, 90 cannot operate in the high-voltage DC charging mode.

[0139] Since the first DCDC converter 81 of the first electrical device 80 can be operated in the high-voltage DC charging mode, power can be supplied to the low-voltage storage battery 110 and the control device 100. This makes it possible to maintain an appropriate power supply to the control device 100 in the high-voltage DC charging mode. Note that if the low-voltage system is not provided with the low-voltage storage battery 110, the advantage of being able to supply power to the control device 100 from the second storage battery 32 via the first DCDC converter 81 is even greater.

[0140] 36 shows the operation state of each switch in the running mode of the vehicle CA. In the running mode, the control device 100 turns on the inter-battery switch 40 and turns off the positive electrode bypass switch 51 and the motor-side switch 61. The control device 100 also alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0141] Furthermore, in the traveling mode, the control device 100 turns off the cutoff switch 55 to prohibit the operation of the second electric device 90. This makes it possible to avoid a situation in which the second electric device 90 breaks down. On the other hand, the control device 100 permits the operation of the first electric device 80 in the traveling mode. Therefore, the control device 100 operates the first electric device 80 when there is a request to operate the first electric device 80, thereby avoiding a situation in which both the first and second electric devices 80, 90 cannot operate in the traveling mode.

[0142] Since the first DC-DC converter 81 can be operated in the traveling mode, power can be supplied from the second storage battery 32 to the low-voltage storage battery 110 and the control device 100 via the first DC-DC converter 81. This makes it possible to maintain an appropriate power supply to the control device 100 in the traveling mode. As a result, the control device 100 can continue to control the drive of the motor 10, and it is possible to avoid a situation in which the vehicle CA cannot travel. Note that if the low-voltage system is not equipped with the low-voltage storage battery 110, the advantage of being able to supply power from the second storage battery 32 to the control device 100 via the first DC-DC converter 81 to enable the vehicle CA to travel is even greater.

[0143] In the driving mode, in addition to using both the first and second storage batteries 31, 32 as a driving power source for the motor 10 as shown in Figure 36, it is also possible to implement a one-sided mode in which only one of the first and second storage batteries 31, 32 is used as a driving power source, as shown in Figures 37, 38 and 39.

[0144] 37 shows the operation state of each switch in single-sided mode 1. In single-sided mode 1, the control device 100 turns off the inter-battery switch 40 and the motor-side switch 61, and turns on the positive-electrode bypass switch 51. The control device 100 also alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0145] Furthermore, in one-sided mode 1, the control device 100 turns on the cutoff switch 55. This allows power to be supplied from the second storage battery 32 to the first and second electric devices 80, 90, and the control device 100 therefore permits the first and second electric devices 80, 90 to operate.

[0146] 38 shows the operation state of each switch in single-sided mode 2. In single-sided mode 2, the control device 100 turns off the inter-battery switch 40 and the positive-electrode bypass switch 51, and turns on the motor-side switch 61. In addition, the control device 100 alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0147] Furthermore, in one-sided mode 2, the control device 100 turns on the cutoff switch 55. This allows power to be supplied from the second storage battery 32 to the first electrical device 80 and from the first storage battery 31 to the second electrical device 90, so the control device 100 permits the operation of the first and second electrical devices 80, 90.

[0148] 39 shows the operation state of each switch in single-sided mode 3. In single-sided mode 3, the control device 100 turns off the positive-electrode bypass switch 51 and the high-potential side main switch SMRH, and turns on the battery switch 40 and the motor-side switch 61. In addition, the control device 100 alternately turns on the upper arm switch SWH and the lower arm switch SWL in each phase to cause the motor 10 to generate torque and run the vehicle CA.

[0149] Furthermore, in one-sided mode 3, the control device 100 allows the first electric device 80 to operate because power can be supplied to the first electric device 80 from the second storage battery 32. On the other hand, in one-sided mode 3, the control device 100 turns off the cutoff switch 55. This is to prevent the voltage of the series-connected body of the first and second storage batteries 31, 32 from being applied to the second electric device 90, which could cause the second electric device 90 to malfunction.

[0150] 40 shows the operation states of each switch in the parking mode of vehicle CA. In the parking mode, the control device 100 turns off the inter-battery switch 40, the positive electrode bypass switch 51, the motor-side switch 61, and the upper and lower arm switches SWH, SWL of the inverter 20. In the parking mode, the control device 100 also turns off the cutoff switch 55 to prohibit operation of the second electric device 90.

[0151] 41 shows the operation state of each switch in the series neutral point mode of this embodiment. The series neutral point mode of this embodiment is a mode in which the inter-battery switch 40 and the motor-side switch 61 are turned on, and the inter-positive pole bypass switch 51 is turned off. In the series neutral point mode, the control device 100 turns off the cutoff switch 55. This prevents the second electric device 90 from failing. Meanwhile, operation of the first electric device 80 is permitted.

[0152] In the series neutral point mode, similarly to the first embodiment, the control device 100 switches the inverter 20 based on the detected values ​​of the first and second current sensors 73, 74 and the first and second voltage sensors 71, 72, thereby transmitting power from one of the first and second storage batteries 31, 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. As a result, when, for example, a traveling mode is selected, the vehicle CA can be traveled while equalizing the states of charge (SOC) of the first and second storage batteries 31, 32.

[0153] The control device 100 performs the operation state control process shown in FIG.

[0154] Next, the operation states of the switches in the three low-voltage DC charging modes will be described.

[0155] 42 shows the operation state of each switch in mode 1. In mode 1, the control device 100 turns off the inter-battery switch 40, the motor-side switch 61, and the upper and lower arm switches SWH, SWL of the inverter 20, and turns on the positive-electrode bypass switch 51. As a result, of the first and second storage batteries 31, 32, only the second storage battery 32 is charged by the low-voltage DC charger 210. In mode 1, the first storage battery 31 is not charged.

[0156] Furthermore, in mode 1, the control device 100 turns on the cutoff switch 55. This enables power supply from the second storage battery 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0157] 43 shows the operation state of each switch in mode 2. In mode 2, the control device 100 turns off the inter-battery switch 40, the inter-positive pole bypass switch 51, and the upper arm switch SWH of the inverter 20, and turns on the motor-side switch 61 and at least one phase lower arm switch SWL of the inverter 20. As a result, of the first and second storage batteries 31, 32, only the first storage battery 31 is charged by the low-voltage DC charger 210. In mode 2, the second storage battery 32 is not charged.

[0158] Furthermore, in mode 2, the control device 100 turns on the cutoff switch 55. This enables power supply from the first storage battery 31 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0159] FIG. 44 shows the operation state of each switch in mode 3. In mode 3, the control device 100 turns off the inter-battery switch 40 and turns on the positive electrode bypass switch 51 and the motor-side switch 61. In mode 3, as in the first embodiment, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted based on the detected values ​​of the first and second current sensors 73 and 74 and the first and second voltage sensors 71 and 72. This adjustment can be performed by alternately turning on the upper and lower arm switches SWH and SWL for at least one phase of the inverter 20, or by repeatedly turning on and off the lower arm switch SWL for at least one phase and turning off the upper arm switch SWH, while outputting a charging current from the low-voltage DC charger 210. Here, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted by adjusting the duty ratio (Ton / Tsw), which is the ratio of the on period Ton of the upper arm switch SWH to one switching period Tsw. According to mode 3, both the first and second storage batteries 31 and 32 can be charged.

[0160] Furthermore, in mode 3, the control device 100 turns on the cutoff switch 55. This enables power supply from the first and second storage batteries 31, 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0161] 45 shows the operating states of each switch in the low-voltage AC charging mode. In the low-voltage AC charging mode, the control device 100 turns off the inter-battery switch 40, the motor-side switch 61, and the upper and lower arm switches SWH, SWL of the inverter 20, and turns on the positive-electrode bypass switch 51. As a result, of the first and second storage batteries 31, 32, only the second storage battery 32 is charged by the on-board charger 92.

[0162] Furthermore, in the low-voltage AC charging mode, the control device 100 turns on the cutoff switch 55. This enables power supply from the second storage battery 32 to the second electric device 90, and allows the operation of the second electric device 90. Therefore, both the first and second electric devices 80, 90 can be operated.

[0163] The operational states of the inter-battery switch 40, the positive electrode bypass switch 51, the motor-side switch 61, and the inverter 20 in the low-voltage AC charging mode shown in Figure 45 correspond to mode 1 shown in Figure 42. Alternatively, the operational states in the low-voltage AC charging mode may correspond to mode 2 shown in Figure 43 or mode 3 shown in Figure 44. In the operational state corresponding to mode 2, only the first storage battery 31 of the first and second storage batteries 31, 32 is charged by the on-board charger 92. In the operational state corresponding to mode 3, the control device 100 can charge both the first and second storage batteries 31, 32 by the on-board charger 92. In this case, the charging power of the first storage battery 31 and the second storage battery 32 can be individually adjusted by adjusting the duty ratio (Ton / Tsw), which is the ratio of the on-period Ton of the upper arm switch SWH to one switching period Tsw.

[0164] FIG. 46 shows the operation state of each switch in the temperature rise mode of the storage battery. In the temperature rise mode, the control device 100 turns off the inter-battery switch 40 and the high-side main switch SMRH, and turns on the positive-side bypass switch 51 and the motor-side switch 61. The control device 100 switches on the inverter 20 so that AC charging / discharging current flows between the first storage battery 31 and the second storage battery 32 via the armature winding 11 and the inverter 20, for example, until the battery temperature Tbat reaches the target temperature Tth. This switching involves alternately turning on the upper and lower arm switches SWH and SWL in at least one phase. In the temperature rise mode, the control device 100 also turns on the cutoff switch 55. This allows operation of both the first and second electrical devices 80 and 90.

[0165] The control device 100 performs the operation state control process shown in FIG.

[0166] According to the present embodiment described above, it is possible to achieve the same effects as the first embodiment.

[0167] Modification of Fifth Embodiment When the control device 100 determines that the value obtained by subtracting the first detected voltage VA from the second detected voltage VB exceeds the determination threshold value ΔVjde, the control device 100 may forcibly increase the power consumption of the first electrical device 80 so that the difference between the first detected voltage VA and the second detected voltage VB approaches 0. This makes it possible to equalize the voltages between the terminals of the first and second storage batteries 31, 32.

[0168] The control device 100 may charge the second storage battery 32 from the low-voltage storage battery 110 using the first DCDC converter 81 in order to maintain the relationship "|VB-VA|≦ΔVjde".

[0169] The rated voltage of the second storage battery 32 (e.g., 400 V) may be higher than the rated voltage of the first storage battery 31 (e.g., 200 V). In this case, for example, the allowable input voltage of the first electrical device 80 may be set to the same voltage as the rated voltage of the second storage battery 32, and the allowable input voltage of the second electrical device 90 may be set to the same voltage as the rated voltage of either the first or second storage battery 31, 32. Furthermore, when the rated voltages of the second storage battery 32 and the first storage battery 31 are different, and the control device 100 determines that the value obtained by subtracting the first detection voltage VA from the second detection voltage VB exceeds the voltage threshold Vj, the control device 100 may forcibly increase the power consumption of the first electrical device 80 so that the difference between the first detection voltage VA and the second detection voltage VB approaches the specified value.

[0170] The cutoff switch 55 may not be provided, and the high-potential side terminal of the second electrical device 90 may be constantly connected to the high-potential side electrical path 22H.

[0171] The first electrical device 80 may be electrically connected in parallel to the first storage battery 31 instead of the second storage battery 32. In this case, the operation state control process of the control device 100 may be executed in a manner similar to that of the third embodiment, which is a modification of the first embodiment.

[0172] When the motor-side switch 61 is turned on, if the terminal voltage of the first storage battery 31 is too high compared to the terminal voltage of the second storage battery 32, a closed circuit is formed including the first storage battery 31, the positive-pole bypass switch 51, the lower-arm diode DL connected in anti-parallel to the lower-arm switch SWL, the armature winding 11, and the motor-side electrical path 25, causing a large current to flow from the first storage battery 31 to the second storage battery 32.

[0173] Therefore, when the first electrical device 80 is electrically connected in parallel to the first storage battery 31, the control device 100 may adjust the power consumption or operating frequency of the first electrical device 80 so as to maintain the relationship "|VB-VA|≦ΔVjde", as in the third embodiment.

[0174] Sixth Embodiment The sixth embodiment will be described below with reference to the drawings, focusing on differences from the fifth embodiment. In this embodiment, as in the second embodiment, the allowable input voltage of the second electric device 90 is higher than the allowable input voltage of the first electric device 80 and is the same voltage (e.g., 800 V) as the sum of the inter-terminal voltages (e.g., rated voltages) of the first and second storage batteries 31, 32. In other words, the second electric device 90 has a high voltage resistance.

[0175] 47 shows the operating states of each switch when the control mode is the high-voltage AC charging mode. In the high-voltage AC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the positive-electrode bypass switch 51, the motor-side switch 61, and the upper and lower arm switches SWH, SWL of the inverter 20. This allows both the first and second storage batteries 31, 32 to be charged by the on-board charger 92. In the high-voltage AC charging mode, the control device 100 also turns on the cutoff switch 55, allowing both the first electric device 80 and the second electric device 90 to operate.

[0176] The control device 100 performs the operation state control process shown in FIG.

[0177] FIG. 48 also shows the operation state of each switch in the series neutral point mode. In the series neutral point mode, the control device 100 turns off the high-side main switch SMRH and turns on the cutoff switch 55. In this case, when the control mode is set to the traveling mode, the control device 100 permits operation of the first and second electric devices 80, 90 and can switch the inverter 20 so that only the second storage battery 32 of the first and second storage batteries 31, 32 serves as the drive power source for the motor 10. The control device 100 can also control the temperature rise of the first and second storage batteries 31, 32 by switching the inverter 20. When selecting the control mode shown in FIG. 48, the control device 100 simply performs the process of step S33 in FIG. 18.

[0178] Seventh Embodiment The seventh embodiment will be described below with reference to the drawings, focusing on differences from the fifth embodiment. In this embodiment, as shown in FIG. 49 , the second electrical device 90 is electrically connected in parallel to the first storage battery 31. The rated voltage of the second storage battery 32 is set to be equal to or higher than the rated voltage of the first storage battery 31, specifically, higher than the rated voltage of the first storage battery 31. The allowable input voltage of the second electrical device 90 is lower than the sum of the inter-terminal voltages (e.g., rated voltages) of the first and second storage batteries 31, 32, and is the same as the allowable input voltage of the first electrical device 80, for example. The maximum power consumption P2max of the second electrical device 90 is lower than the maximum power consumption P1max of the first electrical device 80.

[0179] In this embodiment, the control device 100 performs the same processes as those in the fourth embodiment, including the processes in FIGS.

[0180] Other Embodiments The above-described embodiments may be modified as follows.

[0181] 31 and 49, the first and second electrical devices 80 and 90 may be electrically connected to the first and second storage batteries 31 and 32 via a cutoff switch. Also, the configurations shown in FIGS. 1, 20, and 31 may further include an inter-positive electrode bypass switch 51.

[0182] In the configurations shown in FIGS. 34 and 49, a negative electrode bypass switch 50 may be further provided.

[0183] As shown in FIG. 50, in addition to a switch connecting the neutral point of the armature winding 11 to the negative terminal of the first storage battery 31, a switch connecting the neutral point of the armature winding 11 to the positive terminal of the second storage battery 32 may be provided as a motor-side switch.

[0184] More specifically, a first end of a common path 26 is connected to the neutral point of the armature winding 11. A first end of a first electrical path 27 is connected to a second end of the common path 26, and a second end of the first electrical path 27 is connected to a portion of the inter-battery electrical path 24 closer to the second storage battery 32 than the inter-battery switch 40. A first end of a second electrical path 28 is connected to the second end of the common path 26, and a second end of the second electrical path 28 is connected to a portion of the inter-battery electrical path 24 closer to the first storage battery 31 than the inter-battery switch 40. A first motor-side switch 60 is provided in the first electrical path 27. A second motor-side switch 61 is provided in the second electrical path 28. Note that the common path 26 may not be provided, and the first ends of the first electrical path 27 and the second electrical path 28 may each be connected to the neutral point of the armature winding 11.

[0185] The motor-side switch does not need to be provided in the motor-side electrical path.

[0186] The connection destination of the motor-side electrical path 25 is not limited to the neutral point of the armature winding 11, and may be, for example, an intermediate portion of the armature winding 11. Furthermore, the connection destination of the motor-side electrical path 25 may be the conductive member 23. In this case, taking the configuration shown in FIG. 1 as an example, the upper and lower arm switches SWH, SWL of the phase of the inverter 20 in which the motor-side electrical path 25 is connected to the conductive member 23 may be turned off, and the upper and lower arm switches SWH, SWL of at least one phase other than the phase in which the motor-side electrical path 25 is connected to the conductive member 23 may be used for control of each control mode.

[0187] A positive electrode side connection portion may be provided on the high potential side electrical path 22H on the side opposite the first storage battery 31 side relative to the inverter 20, and a negative electrode side connection portion may be provided on the low potential side electrical path 22L on the side opposite the second storage battery 32 side relative to the inverter 20.

[0188] The positive terminal of the first storage battery 31 and the high-potential-side electrical path 22H may be connected by a first fuse. Also, the negative terminal of the second storage battery 32 and the low-potential-side electrical path 22L may be connected by a second fuse.

[0189] Each of the main switches SMRH, SMRL, the inter-battery switch 40, the bypass switch, and the motor-side switch is not limited to being composed of a single switch, but may be composed of a series connection of multiple switches or a parallel connection of multiple switches.

[0190] The switches of the inverter 20 are not limited to IGBTs with freewheel diodes connected in reverse parallel, but may be, for example, N-channel MOSFETs with body diodes. In this case, the high-potential terminal of the N-channel MOSFET serves as the drain, and the low-potential terminal serves as the source.

[0191] The motor is not limited to a star-connected motor, but may be a delta-connected motor. The motor and inverter are not limited to a three-phase motor, but may be a two-phase motor, or a four-phase or more phase motor. The motor is not limited to a permanent magnet synchronous machine having a permanent magnet as a field pole on the rotor, but may be a wound field synchronous machine having a field winding as a field pole on the rotor. In this case, the rotor may be provided with both a field winding and a permanent magnet. The motor is not limited to a synchronous machine, but may be an induction machine.

[0192] The power storage unit to be charged by the external charger is not limited to a storage battery. For example, it may be a large-capacity electric double layer capacitor, or a unit including both a storage battery and an electric double layer capacitor.

[0193] The mobile body on which the power conversion device is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship.Furthermore, the power conversion device is not limited to a mobile body, but may be a stationary device.

[0194] The control unit and the method described herein may be implemented by a special-purpose computer configured by configuring a processor and memory programmed to perform one or more functions embodied in a computer program. Alternatively, the control unit and the method described herein may be implemented by a special-purpose computer configured by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described herein may be implemented by one or more special-purpose computers configured by combining a processor and memory programmed to perform one or more functions with a processor configured with one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by a computer on a computer-readable non-transitory tangible storage medium.

[0195] Characteristic configurations extracted from the above-described embodiments will be described below. [Configuration 1] A power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31), a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32), an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path, and a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23), a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) that electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) that is electrically connectable in parallel to a target power storage unit that is either the first power storage unit or the second power storage unit, or that is electrically connectable between the high-potential-side electrical path and the low-potential-side electrical path; and a second electric device (90) that is electrically connectable between the high-potential-side electrical path and the low-potential-side electrical path, the first power storage unit, and the second power storage unit, other than the connection target of the first electric device. [Configuration 2] The power conversion device according to Configuration 1, wherein the first electric device is electrically connectable in parallel to the target power storage unit, and the second electric device is electrically connectable between the high potential side electric path and the low potential side electric path.[Configuration 3] The power conversion device according to Configuration 2, comprising: a high-side main switch (SMRH) that electrically connects or disconnects between the high-side terminal of the upper arm switch and the positive terminal of the first power storage unit; and a low-side main switch (SMRL) that electrically connects or disconnects between the low-side terminal of the lower arm switch and the negative terminal of the second power storage unit, wherein an allowable input voltage of the first electric device and the second electric device is a voltage lower than the sum of the voltages of the first power storage unit and the second power storage unit, and a control unit (100) that prohibits operation of the second electric device and allows operation of the first electric device when the power storage unit switch, the high-side main switch, and the low-side main switch are turned on. [Configuration 4] The power conversion device according to configuration 2, further comprising: a control unit (100) that allows operation of at least one of the first electric device and the second electric device when the inter-storage unit switch is turned off, and an allowable input voltage of the first electric device and the second electric device is lower than the sum of the voltage of the first power storage unit and the voltage of the second power storage unit. [Configuration 5] The power conversion device according to configuration 2, further comprising: a control unit (100) that allows operation of at least one of the first electric device and the second electric device when current can be applied to the armature winding from only one of the first power storage unit and the second power storage unit. [Configuration 6] The power conversion device according to any one of configurations 3 to 5, further comprising: an allowable input voltage of the first electric device and the second electric device is equal to the allowable input voltage of the second electric device. [Configuration 7] The power conversion device according to any one of Configurations 3 to 6, wherein the voltage of the target power storage unit is equal to or higher than the voltage of a power storage unit among the first power storage unit and the second power storage unit other than the target power storage unit. [Configuration 8] The power conversion device according to Configuration 4 or 5, wherein at least one of the first electric device and the second electric device includes a DC-DC converter (81, 91), and the DC-DC converter steps down an input voltage and supplies the stepped-down input voltage to the control unit. [Configuration 9] The power conversion device according to Configuration 2, wherein an allowable input voltage of the second electric device is a voltage higher than the allowable input voltage of the first electric device.[Configuration 10] The power conversion device according to Configuration 9, wherein an allowable input voltage of the second electric device is a voltage equivalent to the sum of the voltage of the first power storage unit and the voltage of the second power storage unit. [Configuration 11] The power conversion device according to Configuration 9 or 10, further comprising: a control unit (100) that permits operation of the second electric device on condition that the inter-power storage unit switch is turned on. [Configuration 12] The power conversion device according to Configuration 11, wherein the second electric device includes an internal charger (92) that converts AC voltage output from an external AC power supply (220) into DC voltage and supplies the DC voltage to the first power storage unit and the second power storage unit, and the control unit turns on the inter-power storage unit switch when charging using the internal charger. [Configuration 13] The power conversion device according to any one of configurations 2 to 12, wherein the bypass switch is a negative pole-to-negative pole bypass switch (50) that electrically connects a negative terminal of the first power storage unit and a negative terminal of the second power storage unit, the motor-side electrical path is a path (25 to 27) that electrically connects the armature winding and a portion of the inter-power-storage unit electrical path that is closer to the second power storage unit than the inter-power-storage unit switch, and the target power storage unit is the first power storage unit. [Configuration 14] The power conversion device according to any one of configurations 2 to 12, wherein the bypass switch is a positive pole-to-positive pole bypass switch (51) that electrically connects a positive terminal of the first power storage unit and a positive terminal of the second power storage unit, the motor-side electrical path is a path (25, 26, 28) that electrically connects the armature winding and a portion of the inter-power-storage unit electrical path that is closer to the first power storage unit than the inter-power-storage unit switch, and the target power storage unit is the second power storage unit.[Configuration 15] The power conversion device according to Configuration 1, wherein the bypass switch is an inter-negative pole bypass switch (50) that electrically connects a negative terminal of the first power storage unit and a negative terminal of the second power storage unit; the motor-side electrical path is a path (25 to 27) that electrically connects the armature winding and a part of the inter-power-storage unit electrical path that is closer to the second power storage unit than the inter-power-storage unit switch; the first electric device is electrically connectable in parallel to the first power storage unit or electrically connectable between the high potential side electrical path and the low potential side electrical path; the second electric device is electrically connectable in parallel to the second power storage unit that is the target power storage unit; and a voltage of the first power storage unit is equal to or higher than a voltage of the second power storage unit. [Configuration 16] The power conversion device according to Configuration 1, wherein the bypass switch is an inter-positive pole bypass switch (51) that electrically connects a positive terminal of the first power storage unit and a positive terminal of the second power storage unit, the motor-side electrical path is a path (25, 26, 28) that electrically connects the armature winding and a part of the inter-power-storage-unit electrical path that is on the first power storage unit side relative to the inter-power-storage-unit switch, the first electric device is electrically connectable in parallel to the second power storage unit or electrically connectable between the high-potential-side electrical path and the low-potential-side electrical path, the second electric device is electrically connectable in parallel to the first power storage unit that is the target power storage unit, and a voltage of the second power storage unit is equal to or higher than a voltage of the first power storage unit. [Configuration 17] The power conversion device according to Configuration 15 or 16, wherein a maximum power consumption of the second electric device is lower than a maximum power consumption of the first electric device. [Configuration 18] The power conversion device according to Configuration 15 or 16, wherein the control unit permits operation of the second electric device and prohibits operation of the first electric device when the power conversion device is in a sleep state. [Configuration 19] The power conversion device according to Configuration 17 or 18, wherein the second electric device includes a DC-DC converter (91), and the DC-DC converter of the second electric device steps down the voltage of the target power storage unit and supplies the stepped down voltage to the control unit. [Configuration 20] The power conversion device according to Configuration 15 or 16, further comprising a control unit (100) that sets the power consumption of the second electric device to be greater than the power consumption of the first electric device.[Configuration 21] The power conversion device according to Configuration 20, wherein the control unit increases the power consumption of the second electric device greater than the power consumption of the first electric device so that the voltage of the target power storage unit is equal to or greater than the voltage of a power storage unit among the first and second power storage units other than the target power storage unit. [Configuration 22] The power conversion device according to Configuration 15 or 16, comprising a control unit (100) that increases the operation frequency of the second electric device greater than the operation frequency of the first electric device. [Configuration 23] The power conversion device according to Configuration 22, wherein the control unit increases the operation frequency of the second electric device greater than the operation frequency of the first electric device so that the voltage of the target power storage unit is equal to or greater than the voltage of a power storage unit among the first and second power storage units other than the target power storage unit. [Configuration 24] The power conversion device according to Configuration 15 or 16, wherein the first electric device includes a charging device (81) that is an electric device capable of supplying electric power to one of the first power storage unit and the second power storage unit other than the target power storage unit, and the second electric device includes a discharging device (91) that is an electric device capable of consuming electric power from the target power storage unit.[Configuration 25] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device the electric power storage device includes: a bypass switch (50, 51) that makes at least one of an electrical connection between negative terminals of the first power storage unit and the second power storage unit and an electrical connection between positive terminals of the first power storage unit and the second power storage unit; a high potential side main switch (SMRH) that electrically connects or disconnects between a high potential side terminal of the upper arm switch and a positive terminal of the first power storage unit; a low potential side main switch (SMRL) that electrically connects or disconnects between a low potential side terminal of the lower arm switch and a negative terminal of the second power storage unit; a motor side electrical path (25 to 28) that electrically connects the armature winding or the conductive member to the inter-power storage unit electrical path; a first electric device (80) that can be electrically connected in parallel to a target power storage unit that is either the first power storage unit or the second power storage unit; and a second electric device (90) that can be electrically connected between the high potential side electrical path and the low potential side electrical path, an allowable input voltage of the first electrical device and the second electrical device is a voltage lower than the sum of the voltage of the first power storage unit and the voltage of the second power storage unit; and a program that causes the computer to execute a process of prohibiting operation of the second electrical device and allowing operation of the first electrical device when the power storage unit switch, the high potential side main switch, and the low potential side main switch are turned on.[Configuration 26] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device a bypass switch (50, 51) that makes at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) that electrically connects the armature winding or the conductive member to the inter-power storage unit electrical path; a first electric device (80) that can be electrically connected in parallel to a target power storage unit that is either the first power storage unit or the second power storage unit; and a second electric device (90) that can be electrically connected between the high-potential-side electrical path and the low-potential-side electrical path, wherein an allowable input voltage of the first electric device and the second electric device is a voltage that is lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, and the program causes the computer to execute processing to permit operation of at least one of the first electric device and the second electric device when the inter-power storage unit switch is turned off.[Configuration 27] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device a bypass switch (50, 51) that electrically connects at least one of the negative electrode terminals of the first power storage unit and the second power storage unit and the positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) that electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) that can be electrically connected in parallel to a target power storage unit that is either the first power storage unit or the second power storage unit; and a second electric device (90) that can be electrically connected between the high-potential side electrical path and the low-potential side electrical path, wherein an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, a program that executes a process of permitting operation of at least one of the first electric device and the second electric device when current can be supplied to the armature winding from only one of the first power storage unit and the second power storage unit.[Configuration 28] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device a bypass switch (50, 51) that performs at least one of an electrical connection between negative terminals of the first power storage unit and the second power storage unit and an electrical connection between positive terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) that electrically connects the armature winding or the conductive member to the inter-power storage unit electrical path; a first electric device (80) that can be electrically connected in parallel to a target power storage unit that is either the first power storage unit or the second power storage unit; and a second electric device (90) that can be electrically connected between the high-potential side electrical path and the low-potential side electrical path, wherein an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, and an allowable input voltage of the second electric device is a voltage higher than an allowable input voltage of the first electric device, a program that causes a process to be executed to permit operation of the second electric device on condition that the inter-power storage unit switch is turned on;[Configuration 29] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device a motor-side electrical path (25-27) electrically connecting the armature winding and the inter-storage unit electrical path to the second storage unit side of the inter-storage unit switch; a first electrical device (80) electrically connectable in parallel to the first storage unit or electrically connectable between the high-potential side electrical path and the low-potential side electrical path; and a second electrical device (90) electrically connectable to the second storage unit, wherein a voltage of the first storage unit is equal to or higher than a voltage of the second storage unit, and the program causes the computer to execute, in a sleep state of the power conversion device, a process of permitting operation of the second electrical device and prohibiting operation of the first electrical device, a process of making power consumption of the second electrical device greater than power consumption of the first electrical device, or a process of making an operation frequency of the second electrical device greater than an operation frequency of the first electrical device.[Configuration 30] A program applicable to a power conversion device including: a high-potential side electrical path (22H) electrically connectable to a positive terminal of a first power storage unit (31); a low-potential side electrical path (22L) electrically connectable to a negative terminal of a second power storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high-potential side electrical path and a lower arm switch (SWL) electrically connected to the low-potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), wherein the power conversion device a motor-side electrical path (25, 26, 28) electrically connecting the armature winding and the inter-storage unit electrical path to the first storage unit side of the inter-storage unit switch; a first electrical device (80) electrically connectable in parallel to the second storage unit or electrically connectable between the high-potential side electrical path and the low-potential side electrical path; and a second electrical device (90) electrically connectable to the first storage unit, wherein a voltage of the second storage unit is equal to or higher than a voltage of the first storage unit, and the program causes the computer to execute, in a sleep state of the power conversion device, a process of permitting operation of the second electrical device and prohibiting operation of the first electrical device, a process of making the power consumption of the second electrical device greater than the power consumption of the first electrical device, or a process of making the operation frequency of the second electrical device greater than the operation frequency of the first electrical device.

[0196] Although the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and equivalent modifications. In addition, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

Claims

1. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); In a power conversion device comprising: an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electrical device (90) capable of electrically connecting between the high potential side electrical path and the low potential side electrical path; A power conversion device comprising:

2. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); In a power conversion device comprising: an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electric device (90) electrically connectable to one of the first and second power storage units that is not the target power storage unit; A power conversion device comprising:

3. a high potential side main switch (SMRH) that electrically connects or disconnects a high potential side terminal of the upper arm switch and a positive electrode terminal of the first storage unit; a low potential side main switch (SMRL) that electrically connects or disconnects a low potential side terminal of the lower arm switch and a negative electrode terminal of the second storage unit; Equipped with an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, 2. The power conversion device according to claim 1, further comprising: a control unit (100) that prohibits operation of the second electric device and permits operation of the first electric device when the inter-storage unit switch, the high potential side main switch, and the low potential side main switch are turned on.

4. an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, The power conversion device according to claim 1 , further comprising a control unit (100) that permits operation of at least one of the first electric device and the second electric device when the inter-storage unit switch is turned off.

5. an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, 2. The power conversion device according to claim 1, further comprising a control unit (100) that permits operation of at least one of the first electric device and the second electric device when current can be passed through the armature winding from only one of the first storage unit and the second storage unit.

6. The power conversion device according to any one of claims 3 to 5, wherein an allowable input voltage of the first electric device and an allowable input voltage of the second electric device are equal to each other.

7. The power conversion device according to claim 3 , wherein a voltage of the target power storage unit is equal to or higher than a voltage of a power storage unit other than the target power storage unit, among the first power storage unit and the second power storage unit.

8. At least one of the first electric device and the second electric device includes a DC-DC converter (81, 91), The power conversion device according to claim 4 , wherein the DC-DC converter steps down an input voltage and supplies the stepped-down input voltage to the control unit.

9. The power conversion device according to claim 1 , wherein an allowable input voltage of the second electric device is higher than an allowable input voltage of the first electric device.

10. The power conversion device according to claim 9 , wherein an allowable input voltage of the second electric device is a voltage equivalent to a sum of a voltage of the first power storage unit and a voltage of the second power storage unit.

11. The power conversion device according to claim 9 or 10, further comprising a control unit (100) that permits operation of the second electric device on condition that the inter-storage unit switch is turned on.

12. the second electric device includes an internal charger (92) that converts an AC voltage output from an external AC power source (220) into a DC voltage and supplies the DC voltage to the first power storage unit and the second power storage unit; The power conversion device according to claim 11 , wherein the control unit turns on the inter-power storage unit switch when charging is performed by the internal charger.

13. the bypass switch is an inter-negative electrode bypass switch (50) that electrically connects a negative electrode terminal of the first power storage unit and a negative electrode terminal of the second power storage unit, the motor-side electrical path is a path (25 to 27) that electrically connects the armature winding to a portion of the inter-energy-storage-unit electrical path that is closer to the second power storage unit than the inter-energy-storage-unit switch; The power conversion device according to claim 1 , wherein the target power storage unit is the first power storage unit.

14. the bypass switch is an inter-positive electrode bypass switch (51) that electrically connects a positive electrode terminal of the first power storage unit and a positive electrode terminal of the second power storage unit, the motor-side electrical path is a path (25, 26, 28) that electrically connects the armature winding to a portion of the inter-power-storage-unit electrical path that is closer to the first power storage unit than the inter-power-storage-unit switch, The power conversion device according to claim 1 , wherein the target power storage unit is the second power storage unit.

15. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); In a power conversion device comprising: an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) that can be electrically connected in parallel to the first storage unit or that can be electrically connected between the high potential side electric path and the low potential side electric path; a second electric device (90) electrically connectable in parallel to the second power storage unit which is a target power storage unit; A power conversion device comprising:

16. the bypass switch is an inter-negative electrode bypass switch (50) that electrically connects a negative electrode terminal of the first power storage unit and a negative electrode terminal of the second power storage unit, the motor-side electrical path is a path (25 to 27) that electrically connects the armature winding to a portion of the inter-energy-storage-unit electrical path that is closer to the second power storage unit than the inter-energy-storage-unit switch; The power conversion device according to claim 15 , wherein a voltage of the first power storage unit is equal to or higher than a voltage of the second power storage unit.

17. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); In a power conversion device comprising: an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) that can be electrically connected in parallel to the second storage unit or that can be electrically connected between the high potential side electric path and the low potential side electric path; a second electric device (90) electrically connectable in parallel to the first electric storage unit which is a target electric storage unit; A power conversion device comprising:

18. the bypass switch is an inter-positive electrode bypass switch (51) that electrically connects a positive electrode terminal of the first power storage unit and a positive electrode terminal of the second power storage unit, the motor-side electrical path is a path (25, 26, 28) that electrically connects the armature winding to a portion of the inter-power-storage-unit electrical path that is closer to the first power storage unit than the inter-power-storage-unit switch, The power conversion device according to claim 17 , wherein a voltage of the second power storage unit is equal to or higher than a voltage of the first power storage unit.

19. The power conversion device according to claim 16 or 18, wherein a maximum power consumption of the second electric device is smaller than a maximum power consumption of the first electric device.

20. The power conversion device according to claim 16 or 18, further comprising a control unit (100) that permits operation of the second electric device and prohibits operation of the first electric device in a sleep state of the power conversion device.

21. A control unit for controlling the operation of the first electrical device and the second electrical device, The second electrical device includes a DC-DC converter (91), The power conversion device according to claim 19 , wherein the DC-DC converter of the second electric device steps down a voltage of the target power storage unit and supplies the stepped-down voltage to the control unit.

22. The second electrical device includes a DC-DC converter (91), The power conversion device according to claim 20 , wherein the DC-DC converter of the second electric device steps down a voltage of the target power storage unit and supplies the stepped-down voltage to the control unit.

23. The power conversion device according to claim 16 or 18, further comprising a control unit (100) that makes the power consumption of the second electric device greater than the power consumption of the first electric device.

24. 23. The power conversion device according to claim 22, wherein the control unit makes the power consumption of the second electrical device greater than the power consumption of the first electrical device so that the voltage of the target power storage unit is equal to or greater than the voltage of a power storage unit other than the target power storage unit among the first power storage unit and the second power storage unit.

25. The power conversion device according to claim 16 or 18, further comprising a control unit (100) that sets an operation frequency of the second electric device higher than an operation frequency of the first electric device.

26. 25. The power conversion device according to claim 24, wherein the control unit sets the operation frequency of the second electrical device higher than the operation frequency of the first electrical device so that the voltage of the target power storage unit is equal to or higher than the voltage of a power storage unit other than the target power storage unit among the first power storage unit and the second power storage unit.

27. the first electric device includes a charging device (81) that is an electric device capable of supplying electric power to one of the first power storage unit and the second power storage unit other than the target power storage unit, The power conversion device according to claim 16 or 18, wherein the second electric device includes a discharge device (91) that is an electric device capable of consuming electric power from the target power storage unit.

28. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a high potential side main switch (SMRH) that electrically connects or disconnects a high potential side terminal of the upper arm switch and a positive electrode terminal of the first storage unit; a low potential side main switch (SMRL) that electrically connects or disconnects a low potential side terminal of the lower arm switch and a negative electrode terminal of the second storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electrical device (90) capable of electrically connecting between the high potential side electrical path and the low potential side electrical path; Equipped with an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, The computer includes: a program for executing a process for prohibiting operation of the second electrical device and permitting operation of the first electrical device when the power storage unit switch, the high potential side main switch, and the low potential side main switch are turned on;

29. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electrical device (90) capable of electrically connecting between the high potential side electrical path and the low potential side electrical path; Equipped with an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, The computer includes: a program that executes a process of permitting operation of at least one of the first electric device and the second electric device when the inter-power storage unit switch is turned off;

30. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electrical device (90) capable of electrically connecting between the high potential side electrical path and the low potential side electrical path; Equipped with an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, The computer includes: a program that executes a process of permitting operation of at least one of the first electric device and the second electric device when current can be supplied to the armature winding from only one of the first power storage unit and the second power storage unit.

31. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (50, 51) that performs at least one of an electrical connection between negative electrode terminals of the first power storage unit and the second power storage unit and an electrical connection between positive electrode terminals of the first power storage unit and the second power storage unit; a motor-side electrical path (25-28) electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electric device (80) electrically connectable in parallel to a target power storage unit, which is either the first power storage unit or the second power storage unit; a second electrical device (90) capable of electrically connecting between the high potential side electrical path and the low potential side electrical path; Equipped with an allowable input voltage of the first electric device and the second electric device is a voltage lower than a sum of a voltage of the first power storage unit and a voltage of the second power storage unit, an allowable input voltage of the second electric device is higher than an allowable input voltage of the first electric device, The computer includes: a program that causes a process to be executed to permit operation of the second electric device on condition that the inter-power storage unit switch is turned on;

32. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a negative electrode bypass switch (50) that electrically connects a negative electrode terminal of the first power storage unit and a negative electrode terminal of the second power storage unit; a motor-side electrical path (25-27) electrically connecting the armature winding to a portion of the inter-electrical-storage-unit electrical path that is closer to the second electric storage unit than the inter-electrical-storage-unit switch; a first electric device (80) that can be electrically connected in parallel to the first storage unit or that can be electrically connected between the high potential side electric path and the low potential side electric path; A second electric device (90) electrically connectable to the second storage unit; Equipped with a voltage of the first power storage unit is equal to or higher than a voltage of the second power storage unit, The computer includes: a process of permitting operation of the second electric device and prohibiting operation of the first electric device in a sleep state of the power conversion device; A process of making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or a program that causes a process of making the operation frequency of the second electric device higher than the operation frequency of the first electric device;

33. a high potential side electrical path (22H) electrically connectable to a positive electrode terminal of the first storage unit (31); a low potential side electrical path (22L) electrically connectable to a negative electrode terminal of the second storage unit (32); an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); A computer (101); A program applied to a power conversion device comprising: The power conversion device is an inter-storage unit switch (40) provided in an inter-storage unit electrical path (24) that electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a positive electrode bypass switch (51) that electrically connects a positive electrode terminal of the first power storage unit and a positive electrode terminal of the second power storage unit; a motor-side electrical path (25, 26, 28) electrically connecting the armature winding to a portion of the inter-electrical-storage-unit electrical path that is closer to the first electric storage unit than the inter-electrical-storage-unit switch; a first electric device (80) that can be electrically connected in parallel to the second storage unit or that can be electrically connected between the high potential side electric path and the low potential side electric path; A second electric device (90) electrically connectable to the first storage unit; Equipped with a voltage of the second power storage unit is equal to or higher than a voltage of the first power storage unit, The computer includes: a process of permitting operation of the second electric device and prohibiting operation of the first electric device in a sleep state of the power conversion device; A process of making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or a program that causes a process of making the operation frequency of the second electric device higher than the operation frequency of the first electric device;