Power conversion device and program

Abstract

A power conversion device is provided with: an inverter (20); an electric motor (10) having an armature winding (11); an inter-power-storage-unit switch (40) provided in an inter-power-storage-unit electrical path (24) that electrically connects the negative electrode terminal of the first power storage unit (31) and the positive electrode terminal of the second power storage unit (32); a bypass switch (50, 51); motor-side electrical paths (25-28) that electrically connect the armature windings and the electrical paths between the power storage units; a first electrical device (80); and a second electrical device (90). The first electrical device can be electrically connected in parallel with, for example, a target power storage unit that is either the first power storage unit or the second power storage unit. The second electrical device can be electrically connected to the connection object of the first electrical device.

Description

Citation of related applications

[0001] This application is based on Japanese Patent Application No. 2022-144023 filed on September 9, 2022, and the contents thereof are incorporated herein by reference. Technical Field

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

[0003] Conventionally, a power supply device capable of switching the connection state of two batteries between a series connection state and a parallel connection state is known, for example, as described in Patent Document 1. The power supply device includes a relay for switching the connection state of two batteries to an external charger between a series connection state and a parallel connection state. Prior art literature Patent Literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2022-87465 Summary of the invention

[0005] A new power conversion device capable of switching the connection state of a power storage unit such as a battery is desired.

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

[0007] The present invention discloses a power conversion device, comprising: a high potential side electrical path, the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit; a low potential side electrical path, the low potential side electrical path being electrically connectable to the negative terminal of the second power storage unit; an inverter including 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 an electric motor having an armature winding electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member, The above-mentioned power conversion device comprises: an inter-storage unit switch provided in an inter-storage unit electrical path electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; a motor-side electrical path electrically connecting the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device capable of being electrically connected in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit, or capable of electrically connecting the high potential side electrical path and the low potential side electrical path; and a second electrical device capable of being electrically connected to a connection target of the first electrical device other than the first electrical device in the first power storage unit and the second power storage unit, between the high potential side electrical path and the low potential side electrical path.

[0008] In the present disclosure, by turning on the switch between the storage units and turning off the bypass switch, the first storage unit and the second storage unit are connected in series. On the other hand, by turning off the switch between the storage units and turning on the bypass switch, the first storage unit and the second storage unit are connected in parallel via the inverter and the armature winding. In this way, according to the present disclosure, the connection state of the first storage unit and the second storage unit can be switched. In addition, the structure of the electric motor and the inverter is used to switch the connection state. Therefore, it is possible to provide a power conversion device with a simplified structure.

[0009] The present disclosure includes a first electrical device and a second electrical device. The first electrical device can be electrically connected in parallel with a target power storage unit that is one of the first power storage unit and the second power storage unit, or can electrically connect 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, and to a connection object other than the connection object of the first electrical device in the first power storage unit and the second power storage unit. In this way, since the connection objects of the first electrical device and the second electrical device are different, for example, the first electrical device and the second electrical device can be distinguished for use according to the operating state of the power conversion device, thereby avoiding the first electrical device and the second electrical device from being unable to operate when an abnormality occurs in either the first storage battery or the second storage battery. That is, the redundancy related to the operation of the electrical device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above objects, other objects, features and advantages of the present disclosure will become more apparent with reference to the accompanying drawings and the following detailed description. Figure 1 It is a diagram showing the overall configuration of the system according to the first embodiment. Figure 2 This is a diagram showing an example of an electric device. Figure 3 2 is a diagram showing the operation of the switch in the high-voltage DC charging mode. Figure 4It is a diagram showing the operation manner of the switch in the driving mode of the vehicle. Figure 5 1 is a diagram showing the operation mode of the switch in the one-side mode 1. Figure 6 1 is a diagram showing the operation mode of the switch in the one-side mode 2. Figure 7 1 is a diagram showing the operation mode of the switch in the one-side mode 3. Figure 8 2 is a diagram showing the operation method of the switch in the parking mode. Fig. 9 2 is a diagram showing the operation of the switch in the series neutral point mode. Fig.10 Detailed description of the process for controlling the operating state of an electric device. Fig.11 1 is a diagram showing the operation mode of the switch in Mode 1 of the low-voltage DC charging mode. Fig.12 1 is a diagram showing the operation mode of the switch in Mode 2 of the low-voltage DC charging mode. Fig.13 1 is a diagram showing the operation mode of the switch in Mode 3 of the low-voltage DC charging mode. Fig.14 2 is a diagram showing the operation of the switch in the low voltage AC charging mode. Fig.15 It is a diagram showing the operation mode of the switch in the battery temperature increase mode. Fig.16 Detailed description of the process for controlling the operating state of an electric device. Fig.17 1 is a diagram showing the operation mode of the switch in the high-voltage AC charging mode of the second embodiment. Fig.18 Detailed description of the process for controlling the operating state of an electric device. Fig.19 2 is a diagram showing the operation of the switch in the series neutral point mode. Fig. 20 It is a diagram showing the overall configuration of a system according to the third embodiment. Fig.21 2 is a diagram showing the operation of the switch in the high-voltage DC charging mode. Fig. 22 It is a diagram showing the operation manner of the switch in the driving mode of the vehicle. Fig.23 2 is a diagram showing the operation method of the switch in the parking mode. Fig.24 2 is a diagram showing the operation of the switch in the series neutral point mode. Fig.25 1 is a diagram showing the operation mode of the switch in Mode 1 of the low-voltage DC charging mode. Fig.26 1 is a diagram showing the operation mode of the switch in Mode 2 of the low-voltage DC charging mode. Fig. 27 1 is a diagram showing the operation mode of the switch in Mode 3 of the low-voltage DC charging mode. Fig.28 2 is a diagram showing the operation of the switch in the low voltage AC charging mode. Fig.29 It is a diagram showing the operation mode of the switch in the battery temperature increase mode. Fig.30 It is a diagram showing the operation mode of the switch in the series neutral point mode according to the modification of the third embodiment. Fig.31 It is a diagram showing the overall configuration of a system according to the fourth embodiment. Fig.32 Detailed description of the process for controlling the operating state of an electric device. Fig.33 Detailed description of the process for controlling the operating state of an electric device. Fig.34 It is a diagram showing the overall configuration of a system according to the fifth embodiment. Fig.35 2 is a diagram showing the operation of the switch in the high-voltage DC charging mode. Fig.36 It is a diagram showing the operation manner of the switch in the driving mode of the vehicle. Fig.37 1 is a diagram showing the operation mode of the switch in the one-side mode 1. Fig.38 1 is a diagram showing the operation mode of the switch in the one-side mode 2. Fig.39 1 is a diagram showing the operation mode of the switch in the one-side mode 3. Fig.40 2 is a diagram showing the operation method of the switch in the parking mode. Fig.41 2 is a diagram showing the operation of the switch in the series neutral point mode. Fig.42 1 is a diagram showing the operation mode of the switch in Mode 1 of the low-voltage DC charging mode. Fig.43 1 is a diagram showing the operation mode of the switch in Mode 2 of the low-voltage DC charging mode. Fig.44 1 is a diagram showing the operation mode of the switch in Mode 3 of the low-voltage DC charging mode. Fig.45 2 is a diagram showing the operation of the switch in the low voltage AC charging mode. Fig.46 It is a diagram showing the operation mode of the switch in the battery temperature increase mode. Fig.47 1 is a diagram showing the operation manner of the switch in the high-voltage AC charging mode according to the sixth embodiment. Fig.48 2 is a diagram showing the operation of the switch in the series neutral point mode. Fig.49 It is an overall structural diagram of the system according to the seventh embodiment. Fig.50 It is an overall structural diagram of a system according to another embodiment. DETAILED DESCRIPTION Hereinafter, multiple embodiments are described with reference to the accompanying drawings. In multiple embodiments, functionally and / or structurally corresponding parts and / or associated parts are sometimes marked with the same reference numerals or reference numerals that are different by more than one hundred. For the corresponding parts and / or associated parts, reference can be made to the description of other embodiments.

[0012] <First embodiment> Hereinafter, a first embodiment of the power conversion device of the present disclosure will 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 constitutes an in-vehicle system.

[0013] The system installed in the vehicle CA has a power conversion device. Figure 1 As shown, 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, having a star-connected U-phase, V-phase, and W-phase armature winding 11 and a rotor not shown. The armature winding 11 of each phase is arranged in a manner that the electrical angle is staggered by 120°. The motor 10 is, for example, a permanent magnet synchronous machine. The rotor can transmit power to the drive wheels of the vehicle CA. Therefore, the motor 10 becomes a source of torque that causes the vehicle CA to travel.

[0014] The inverter 20 includes a series connection of three corresponding upper arm switches SWH and lower arm switches SWL. An upper arm diode DH as a freewheeling diode is connected in reverse parallel to the upper arm switch SWH, and a lower arm diode DL as a freewheeling diode is connected in reverse parallel to the lower arm switch SWL. In the present embodiment, each switch SWH, SWL is an IGBT.

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

[0016] In each phase, the connection point between the emitter as the low potential side terminal of the upper arm switch SWH and the collector as the high potential side terminal of the lower arm switch SWL is connected to the first end of the armature winding 11 via a conductive member 23 such as a busbar. The second ends of the armature windings 11 of each phase are connected to each other at a neutral point. In addition, in the present embodiment, the number of turns of the armature windings 11 of each phase is set to be the same. As a result, the inductance of the armature windings 11 of each phase is set to be the same.

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

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

[0019] The first battery 31 and the second battery 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 portion to which a positive terminal of an external charger can be connected is provided at a first end side of the high potential side electrical path 22H. A negative electrode side connection portion to which a negative terminal of an external charger can be connected is provided at a first end side of the low potential side electrical path 22L.

[0020] The power conversion device has a main switch for electrically connecting or disconnecting the first battery 31 and the second battery 32 from the inverter 20. In detail, as the main switch, a high potential side main switch SMRH and a low potential side main switch SMRL are provided. In the present embodiment, each main switch SMRH, SMRL is a mechanical relay. Each main switch SMRH and SMRL blocks the flow of bidirectional current when disconnected, and allows the flow of bidirectional current when connected. A high potential side main switch SMRH is provided in the high potential side electrical path 22H, and a low potential side main switch SMRL is provided in the low potential side electrical path 22L. In addition, each main switch SMRH, SMRL is not limited to a mechanical relay, and may also be a semiconductor switch element, for example.

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

[0022] The inter-battery switch 40 is provided in the inter-battery electrical path 24 (corresponding to the "inter-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. By turning on the inter-battery switch 40, 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, by turning off the inter-battery switch 40, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically disconnected.

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

[0024] The motor side switch 60 is provided in the motor side electrical path 25 that connects a position of the inter-battery electrical path 24 that is closer to the second battery 32 than the inter-battery switch 40 to the neutral point of the armature winding 11. By turning on the motor side switch 60, the neutral point of the armature winding 11 is electrically connected to the positive terminal of the second battery 32. On the other hand, by turning off the motor side switch 60, the neutral point of the armature winding 11 and the positive terminal of the second battery 32 are electrically disconnected.

[0025] The power conversion device includes a first voltage sensor 71 for detecting the voltage between the terminals of the first battery 31 and a second voltage sensor 72 for detecting the voltage between the terminals of the second battery 32. The power conversion device includes a first current sensor 73 for detecting the current flowing through the first battery 31 and a second current sensor 74 for detecting the current flowing through the second battery 32. The power conversion device includes a first temperature sensor 75 for detecting the temperature of the first battery 31 and a second temperature sensor 76 for detecting the temperature of the second battery 32. In addition, as other sensors, the power conversion device includes a rotation angle sensor for detecting the rotation angle (electrical angle) of the rotor and a phase current sensor for detecting the phase current flowing through the armature winding 11 of each phase.

[0026] The detection value of each sensor is input to the control device 100 (equivalent to the "control unit") included in the power conversion device. The control device 100 is mainly composed of a microcomputer 101, and the microcomputer 101 includes a CPU. The functions provided by the microcomputer 101 can be provided by software recorded in a physical memory device and a computer that executes the software, only software, only hardware, or a combination of them. For example, in the case where the microcomputer 101 is provided by an electronic circuit as hardware, it can be provided by a digital circuit or an analog circuit including a plurality of logic circuits. For example, the microcomputer 101 executes a program stored in a non-transitory tangible storage medium (non-transitory tangible storage medium) included in itself as a storage unit. The program includes, for example, the following Figure 7 , Fig.13 The program for the processing shown in the above description is executed by executing the program. The method corresponding to the program is executed. The storage unit is, for example, a nonvolatile memory. In addition, the program stored in the storage unit can be updated through a communication network such as the Internet such as OTA (Over The Air).

[0027] The control device 100 performs switch control of each switch SWH and SWL constituting the inverter 20 based on the detection value of each sensor, so as to feedback control the control amount of the motor 10 to a target value. The control amount is, for example, torque. In each phase, the upper arm switch SWH and the lower arm switch SWL are alternately turned on. Through this feedback control, the rotational power of the rotor is transmitted to the drive wheels of the vehicle CA, so that the vehicle CA moves.

[0028] The first battery 31 and the second battery 32 of the present embodiment are batteries having the same rated voltage (e.g., 400 V). As a high-voltage auxiliary device capable of using a battery as a power supply source, the power conversion device includes a first electrical device 80 and a second electrical device 90. Each of the electrical devices 80 and 90 is driven and controlled by a control device 100. Each of the electrical devices 80 and 90 may be one electrical device or a plurality of electrical devices.

[0029] The high potential side terminal of the first electrical device 80 is connected to the high potential side electrical path 22H, and the low potential side terminal (ground terminal) of the first electrical device 80 is connected to the inter-battery electrical path 24. Thus, the first electrical device 80 is electrically connected in parallel with the first storage battery 31. The first electrical device 80 is powered by the first storage battery 31, for example, to operate.

[0030] In this embodiment, the allowable input voltage of the first electrical device 80 is lower than the sum of the voltages (e.g., rated voltages) between the terminals of the first storage battery 31 and the second storage battery 32. The allowable input voltage is, for example, the maximum value of the input voltage that can be supplied to the electrical device. Figure 2 As shown, the first electrical device 80 of the present embodiment includes a first DCDC converter 81. The first DCDC converter 81 has a function of stepping down the input voltage and supplying it to the low-voltage battery 110 and the control device 100 of the vehicle-mounted low-voltage system, and acts as a discharge device for discharging from the first battery 31. The low-voltage battery 110 is a battery whose rated voltage (for example, 12V) is lower than the rated voltage of the first battery 31 and the second battery 32. The control device 100 operates using the power supplied from at least one of the low-voltage battery 110 and the first DCDC converter 81. In addition, the first DCDC converter 81 has a function of stepping up the voltage input from the low-voltage battery 110 and outputting it to the battery, and also acts as a charging device for charging the battery. That is, the first DCDC converter 81 is a bidirectional DCDC converter. The first electrical device 80 may also include, for example, an electric compressor and a heater constituting an air conditioning device in the vehicle interior.

[0031] In addition, the inverter 20 and each electrical device 80, 90, etc. can actually be driven and controlled by different control devices. However, in this embodiment, for convenience, these control devices are combined and combined in Figure 1 and Figure 2 In the figures, one control device 100 is shown.

[0032] Back to Figure 1As described above, the high potential side terminal of the second electrical device 90 is connected to the high potential side electrical path 22H via the disconnect 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 the present embodiment, the disconnect switch 55 is a mechanical relay. The disconnect switch 55 blocks the flow of bidirectional current when it is disconnected by the control device 100, and allows the flow of bidirectional current when it is connected by the control device 100. In addition, the disconnect switch 55 is not limited to a mechanical relay, and may also be a semiconductor switch element, for example.

[0033] In this embodiment, the allowable input voltage of the second electrical device 90 is the same voltage as the allowable input voltage of the first electrical device 80 (for example, 400 V). Figure 2 As shown, the second electrical device 90 of the present embodiment includes a second DCDC converter 91 and an onboard charger 92 (equivalent to an "internal charger"). The second DCDC converter 91 has a function of stepping down the input voltage and supplying it to the low-voltage battery 110 and the control device 100 of the onboard low-voltage system, and acts as a discharge device for discharging from the second battery 32.

[0034] The onboard charger 92 is connected to the AC power source 220 (see Fig.11 ) is converted into a DC voltage and supplied to the battery to charge the battery. The AC power source 220 is, for example, a stationary power source. The onboard charger 92 is an interface for connecting to the AC power source 220, and, for example, the AC power source 220 is connected to the onboard charger 92 by a user or an operator. The onboard charger 92 has a rectifier circuit that converts the AC voltage input from the external AC power source 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 side connection portion of the high potential side electric path 22H and the negative electrode side connection portion of the low potential side electric path 22L are interfaces for connecting to an external charger. For example, a user or an operator connects an external charger to each connection portion.

[0036] In the present embodiment, the inter-battery switch 40 , the inter-negative electrode bypass switch 50 , the motor-side switch 60 , and the disconnection switch 55 switch their operating states in accordance with the control mode of the vehicle CA. Each control mode will be described below.

[0037] Figure 3The operation state of each switch in the high-voltage DC charging mode is shown. When the control device 100 determines that the high-voltage DC charger 200 is connected as an external charger at each connection portion, it determines that the control mode is the high-voltage DC charging mode. The charging voltage of the DC output from the high-voltage DC charger 200 is the same voltage as the terminal voltage (specifically, the rated voltage) of the series connection body of the first battery 31 and the second battery 32, for example, 800V. 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 arm switch SWH and the lower arm switch SWL of the inverter 20. As a result, the first battery 31 and the second battery 32 are connected in series with the high-voltage DC charger 200. As a result, a current flows through a closed loop including the high-voltage DC charger 200, the high-potential side electrical path 22H, the first battery 31, the inter-battery switch 40, the second battery 32, and the low-potential side electrical path 22L, and the first battery 31 and the second battery 32 are charged. At this time, since the upper arm switch SWH of the inverter 20 and the motor-side switch 60 are turned off, it is possible to prevent the charging current of the high-voltage DC charger 200 from flowing through the inverter 20 and the armature winding 11 .

[0038] In addition, the control device 100 disconnects the disconnect 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 electrical device 90. Therefore, in order to avoid the occurrence of a failure of the second electrical device 90, the disconnect switch 55 is disconnected. On the other hand, the control device 100 allows the operation of the first electrical device 80 in the high-voltage DC charging mode. Therefore, the control device 100 operates the first electrical device 80 when there is an operation request for the first electrical device 80, thereby avoiding the occurrence of a situation in which both the first electrical device 80 and the second electrical device 90 cannot operate in the high-voltage DC charging mode. As a result, the redundancy related to the operation of the electrical device can be improved.

[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 battery 31 with a relatively large storage capacity to the low-voltage battery 110 with a relatively small storage capacity and the control device 100 via the first DCDC converter 81. As a result, the power supply to the control device 100 in the high-voltage DC charging mode can be appropriately maintained. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, the advantage of being able to supply power from the first battery 31 to the control device 100 via the first DCDC converter 81 is greater.

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

[0041] In addition, the control device 100 turns off the cut-off switch 55 and prohibits the operation of the second electrical device 90 in the driving mode. As a result, it is possible to avoid a situation where the second electrical device 90 fails. On the other hand, the control device 100 allows the operation of the first electrical device 80 in the driving mode. Therefore, the control device 100 operates the first electrical device 80 when there is an operation request for the first electrical device 80, thereby avoiding the occurrence of a situation where both the first electrical device 80 and the second electrical device 90 cannot operate in the driving mode. As a result, it is possible to improve the redundancy related to the operation of the electrical devices.

[0042] Since the first DCDC converter 81 can be operated in the driving mode, power can be supplied from the first battery 31 with a relatively large storage capacity via the first DCDC converter 81 to the low-voltage battery 110 with a relatively small storage capacity and the control device 100. As a result, the power supply to the control device 100 in the driving mode can be properly maintained. As a result, the control device 100 can continue to control the drive of the electric motor 10, and the occurrence of a situation where the vehicle CA cannot travel can be avoided. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, in order to enable the vehicle CA to travel, the advantage of being able to supply power from the first battery 31 via the first DCDC converter 81 to the control device 100 is greater.

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

[0044] Furthermore, the control device 100 turns on the disconnect switch 55 in the single-side mode 1. Thus, since the first battery 31 can supply power to the first and second electrical devices 80 and 90 , the control device 100 permits the first and second electrical devices 80 and 90 to operate.

[0045] Figure 6 1 shows the operation state of each switch in the single-side mode 2. In the single-side mode 2, the control device 100 turns off the inter-battery switch 40 and the inter-negative bypass switch 50, and turns on the motor-side switch 60. In addition, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0046] Furthermore, the control device 100 turns on the disconnect switch 55 in the single-side mode 2. Thus, the first battery 31 can supply power to the first electrical device 80 and the second battery 32 can supply power to the second electrical device 90. Therefore, the control device 100 permits the first electrical device 80 and the second electrical device 90 to operate.

[0047] Figure 7 1 shows the operation state of each switch in the single-side mode 3. In the single-side mode 3, the control device 100 turns off the inter-negative bypass switch 50 and the low-potential side main switch SMRL, and turns on the inter-battery switch 40 and the motor side switch 60. In addition, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0048] In addition, the control device 100 can supply power from the first storage battery 31 to the first electrical device 80 in the single-sided mode 3, and therefore allows the operation of the first electrical device 80. On the other hand, the control device 100 turns off the disconnection switch 55 in the single-sided mode 3. This is to prevent the voltage of the series connection of the first storage battery 31 and the second storage battery 32 from being applied to the second electrical device 90, thereby preventing the second electrical device 90 from malfunctioning.

[0049] Figure 8The operation state of each switch in the parking mode of the vehicle CA is shown. For example, when the control device 100 determines that the start switch of the vehicle CA is turned off by the user, it determines that the control mode is the parking mode. In the parking mode, the control device 100 turns off the inter-battery switch 40, the inter-negative bypass switch 50, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20. In addition, the control device 100 turns off the disconnection switch 55 in the parking mode and prohibits the operation of the second electrical device 90. The prohibition of the operation is because the inter-battery switch 40 is turned off in the parking mode, so that the second electrical device 90 cannot be powered from the first battery 31 and the second battery 32.

[0050] in addition, Fig. 9 The operation state of each switch in the series neutral point mode is shown. The series neutral point mode is a mode in which the inter-battery switch 40 and the motor side switch 60 are turned on, and the inter-negative bypass switch 50 is turned off. The control device 100 turns off the disconnection switch 55 in the series neutral point mode. This can avoid the situation where the second electrical device 90 fails. On the other hand, the operation of the first electrical device 80 is allowed.

[0051] In the series neutral point mode, the control device 100 performs a switching operation of the inverter 20 based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72, so that power can be transmitted from one of the first battery 31 and the second battery 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. In this switching operation, the upper arm switch SWH and the lower arm switch SWL corresponding to at least one are alternately turned on. As a result, for example, when the driving mode is selected, the vehicle CA can be driven while the charging rates (SOC) of the first battery 31 and the second battery 32 are equalized.

[0052] Fig.10 The following is a diagram showing the procedure of an operation state control process of an electric device 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 driving 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, the cutoff switch 55 is turned off, and the operation of the second electrical device 90 is prohibited. Meanwhile, the operation of the first electrical device 80 is permitted.

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

[0056] Fig.11 The operation state of each switch in mode 1 is shown. When the control device 100 determines that the low-voltage DC charger 210 is connected as an external charger at each connection portion, 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 voltage as the rated voltage of the first battery 31 and the second battery 32, for example, 400V. 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 arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, only the first battery 31 (equivalent to the "target storage unit") of the first battery 31 and the second battery 32 is charged by the low-voltage DC charger 210. In mode 1, the second battery 32 is not charged.

[0057] Furthermore, the control device 100 turns on the cutoff switch 55 in mode 1. This allows power to be supplied from the first battery 31 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0058] Fig.12 1 shows the operating state of each switch in mode 2. In mode 2, the control device 100 turns off the inter-battery switch 40, the inter-negative bypass switch 50, and the lower arm switch SWL of the inverter 20, and turns on the motor side switch 60 and the upper arm switch SWH of at least one phase of the inverter 20. As a result, only the second battery 32 of the first battery 31 and the second 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 battery 31 is not charged.

[0059] Furthermore, the control device 100 turns on the cutoff switch 55 in mode 2. This allows the second battery 32 to supply power to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0060] Fig.131 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 inter-negative bypass switch 50 and the motor side switch 60. In mode 3, based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72, the charging power of the first storage battery 31 and the second storage battery 32 can be adjusted individually. This adjustment can be implemented by alternately turning on the upper arm switch SWH and the lower arm switch SWL corresponding to at least one of the inverters 20 while outputting the charging current from the low-voltage DC charger 210, or repeatedly turning on and off the upper arm switch SWH corresponding to at least one and turning off the lower arm switch SWL. Here, by adjusting the ratio of the on period Ton of the upper arm switch SWH to one switching cycle Tsw, that is, the duty ratio (Ton / Tsw), the charging power of the first storage battery 31 and the second storage battery 32 can be adjusted individually. According to mode 3, both the first storage battery 31 and the second storage battery 32 can be charged.

[0061] Furthermore, the control device 100 turns on the disconnect switch 55 in mode 3. This allows power to be supplied from the first battery 31 and the second battery 32 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0062] Fig.14 The operating state of each switch in the low-voltage AC charging mode is shown. When the control device 100 determines that an external AC power source 220 is connected to the onboard charger 92 and there is a low-voltage charging request, it determines that the control mode is the low-voltage AC charging mode. The control device 100 performs drive control of the onboard charger 92 in the low-voltage AC charging mode so that the charging voltage output from the onboard charger 92 to the first battery 31 becomes the same voltage as the first battery 31. In the low-voltage AC charging mode, the control device 100 disconnects the inter-battery switch 40, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, only the first battery 31 of the first battery 31 and the second battery 32 is charged by the onboard charger 92.

[0063] Furthermore, the control device 100 turns on the cutoff switch 55 in the low voltage AC charging mode. This allows power to be supplied from the first battery 31 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0064] in addition, Fig.14The operation states of the inter-battery switch 40, the inter-negative electrode bypass switch 50, the motor side switch 60 and the inverter 20 in the low-voltage AC charging mode shown are the same as those described above. Figure 8 In addition, the above operating state in the low voltage AC charging mode can also be the same as the previous Fig.12 The operating state corresponding to the mode 2 shown in the figure, or the previous Fig.13 The operation state corresponding to the mode 3 shown. In the operation state corresponding to the mode 2, only the second battery 32 of the first battery 31 and the second battery 32 is charged by the onboard charger 92. In the operation state corresponding to the mode 3, the control device 100 can charge both the first battery 31 and the second battery 32 through the onboard charger 92. In this case, by adjusting the duty ratio (Ton / Tsw) of the on period Ton of the upper arm switch SWH relative to one switching cycle Tsw, the charging power of the first battery 31 and the second battery 32 can be adjusted separately.

[0065] Fig.15 The operation state of each switch in the battery temperature increase mode is shown. 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 temperature increase mode. The battery temperature Tbat is, for example, the lower temperature of the temperature of the first battery 31 detected by the first temperature sensor 75 (hereinafter referred to as the first detected temperature TA) and the temperature of the second battery 32 detected by the second temperature sensor 76 (hereinafter referred to as the second detected temperature TB).

[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 inter-negative bypass switch 50 and the motor side switch 60. The control device 100, for example, performs a switching operation of the inverter 20 so that the AC charge and discharge current flows between the first battery 31 and the second battery 32 via the armature winding 11 and the inverter 20 until the battery temperature Tbat reaches the target temperature Tth. The switching operation here is a switching operation of alternately turning on the upper arm switch SWH and the lower arm switch SWL in at least one phase. The temperature rise mode can promote the heat generated by the internal resistance of the battery, and the temperature of the first battery 31 and the second battery 32 can be increased. As a result, the maximum charging power of the first battery 31 and the second battery 32 can be increased, for example, the charging time of the first battery 31 and the second battery 32 when the vehicle CA is parked can be shortened.

[0067] Furthermore, in the temperature increase mode, the control device 100 turns on the cutoff switch 55. This allows the operation of both the first electrical device 80 and the second electrical device 90.

[0068] Fig.16 The following is a diagram showing the procedure of an operation state control process of an electric device 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 heating mode.

[0070] In step S20 , when it is determined that the current control mode is the low voltage DC charging mode, the low voltage AC charging mode or the temperature rising mode, the process proceeds to step S21 , the cutoff switch 55 is turned on, and the operation of the first electrical device 80 and the second electrical device 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 value obtained by subtracting the voltage between the terminals of the second storage battery 32 detected by the second voltage sensor 72 (hereinafter referred to as the second detection voltage VB) from the voltage between the terminals of the first storage battery 31 detected by the first voltage sensor 71 (hereinafter referred to as the first detection voltage VA) 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 detection voltage VA and the second detection voltage VB approaches 0. In this way, the voltage between the terminals of the first storage battery 31 and the second storage battery 32 can be equalized. In addition, the determination threshold value ΔVjde is a value smaller than the rated voltage of each storage battery 31, 32. The determination threshold value ΔVjde is set to a value of 1 / 10 or less, 1 / 20 or less, 1 / 50 or less, or 1 / 100 or less of the value of the lower one of the rated voltages of each storage battery 31, 32, for example.

[0073] The rated voltage of the first battery 31 (e.g., 400V) may be higher than the rated voltage of the second battery 32 (e.g., 200V). In this case, for example, the allowable input voltage of the first electrical device 80 may be the same voltage as the rated voltage of the first battery 31, and the allowable input voltage of the second electrical device 90 may be the same voltage as the rated voltage of either the first battery 31 or the second battery 32. In addition, when the rated voltage of the first battery 31 is different from the rated voltage of the second battery 32, 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 predetermined value when it is determined that the value obtained by subtracting the second detection voltage VB from the first detection voltage VA exceeds the voltage threshold value Vj. Here, the voltage threshold value Vj is set, for example, to the voltage difference between the first battery 31 and the second battery 32, where the maximum value of the inrush current and the stable value are less than the allowable value, determined by the relationship between "the impedance of the current path between the first battery 31 and the second battery 32 (specifically, the impedance of the first battery 31 and the second battery 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 battery 31 and the second battery 32" when the motor side switch 60 is turned on. Here, the allowable value is, for example, the maximum current that the components on the current path can safely withstand. The specified value may be set to the same value as the voltage threshold value Vj, or may be set to a value smaller than the voltage threshold value Vj.

[0074] · It is also possible to not provide the disconnection switch 55, but to always connect the high potential side terminal of the second electrical device 90 to the high potential side electrical path 22H. In this case, the control device 100 Fig.10 In step S11 of the embodiment, the process of prohibiting the operation of the second electrical device 90 may be executed.

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

[0076] Fig.17The operation state of each switch when the control mode is the high-voltage AC charging mode is shown. When the control device 100 determines that the AC power supply 220 is connected to the onboard charger 92 and there is a high-voltage charging request, it determines that the control mode is the high-voltage AC charging mode. The control device 100 performs drive control of the onboard charger 92 in the high-voltage AC charging mode so that the charging voltage output from the onboard charger 92 to the first battery 31 and the second battery 32 becomes the same voltage as the rated voltage of the series connection of the first battery 31 and the second battery 32. In the high-voltage AC charging mode, the control device 100 turns on the inter-battery switch 40 and turns off the inter-negative bypass switch 50, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20. As a result, both the first battery 31 and the second battery 32 are charged by the onboard charger 92.

[0077] In addition, the control device 100 turns on the cutoff switch 55 in the high-voltage AC charging mode, and allows the operation of both the first electrical device 80 and the second electrical device 90. The operation of the second electrical device 90 can be allowed because the allowable input voltage of the second electrical device 90 is the same voltage as the total value of the rated voltages of the first battery 31 and the second battery 32.

[0078] Fig.18 The following is a diagram showing the procedure of an operation state control process of an electric device 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, the cutoff switch 55 is turned off, and the operation of the second electrical device 90 is prohibited. Meanwhile, the operation of the first electrical 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 to determine whether the current control mode is the high-voltage DC charging mode, the high-voltage AC charging mode, or the traveling mode.

[0082] In step S32, when it is determined that the current control mode is one of 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 electrical device 80 and the second electrical device 90 is allowed.

[0083] in addition, Fig.19The operating state of each switch in the series neutral point mode is shown. In the series neutral point mode, the control device 100 disconnects the low potential side main switch SMRL and turns on the disconnection switch 55. In this case, the control device 100 allows the operation of the first electrical device 80 and the second electrical device 90 when the control mode is set to the driving mode, and can perform the switching operation of the inverter 20 that uses only the first battery 31 of the first battery 31 and the second battery 32 as the driving power source of the motor 10. In addition, the control device 100 can also perform temperature rise control of the first battery 31 and the second battery 32 by performing the switching operation of the inverter 20. In addition, the control device 100 selects Fig.18 In the control mode shown, just perform the previous Fig.18 The processing of step S33 is sufficient.

[0084] <Third Embodiment> Hereinafter, referring to the accompanying drawings, the third embodiment will be described with a focus on the differences from the first embodiment. Fig. 20 As shown, the first electrical device 80 is electrically connected in parallel with the second battery 32 (corresponding to the "target battery unit") rather than the first battery 31. The rated voltage of the first battery 31 (eg, 400V) is higher than the rated voltage of the second battery 32 (eg, 200V).

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

[0086] Fig.21 1 shows the operation 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 inter-negative electrode bypass switch 50, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20. As a result, the first battery 31 and the second battery 32 are charged.

[0087] In addition, the control device 100 opens the disconnect switch 55 in the high-voltage DC charging mode. Thus, it is possible to avoid a situation where the second electrical device 90 fails. On the other hand, the control device 100 allows the operation of the first electrical device 80 in the high-voltage DC charging mode. Therefore, when there is an operation request for the first electrical device 80, the control device 100 uses the second storage battery 32 as a power supply source to operate the first electrical device 80, thereby avoiding a situation where both the first electrical device 80 and the second electrical device 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 battery 31 with a relatively large storage capacity to the low-voltage battery 110 with a relatively small storage capacity and the control device 100 via the first DCDC converter 81. As a result, the power supply to the control device 100 in the high-voltage DC charging mode can be appropriately maintained. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, the advantage of being able to supply power from the first battery 31 to the control device 100 via the first DCDC converter 81 is greater.

[0089] Fig. 22 The operation states of the switches in the driving mode of the vehicle CA are shown. In the driving mode, the control device 100 turns on the inter-battery switch 40 and turns off the inter-negative electrode bypass switch 50 and the motor-side switch 60. In addition, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0090] Furthermore, the control device 100 opens the cutoff switch 55 in the driving mode and prohibits the operation of the second electrical device 90. This can avoid a situation where a failure occurs in the second electrical device 90. On the other hand, the control device 100 permits the operation of the first electrical device 80 in the driving mode.

[0091] Since the first DCDC converter 81 can be operated in the driving mode, power can be supplied from the first battery 31 with a relatively large storage capacity via the first DCDC converter 81 to the low-voltage battery 110 with a relatively small storage capacity and the control device 100. As a result, the power supply to the control device 100 in the driving mode can be properly maintained. As a result, the control device 100 can continue to control the drive of the electric motor 10, and the occurrence of a situation where the vehicle CA cannot travel can be avoided. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, in order to enable the vehicle CA to travel, the advantage of being able to supply power from the first battery 31 via the first DCDC converter 81 to the control device 100 is greater.

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

[0093] Fig.23 The operation state of each switch in the parking mode of the vehicle CA is shown. In the parking mode, the control device 100 turns off the inter-battery switch 40, the inter-negative bypass switch 50, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20. In addition, the control device 100 turns off the disconnection switch 55 in the parking mode and prohibits the operation of the second electrical device 90.

[0094] in addition, Fig.24 The operation states of the switches in the series neutral point mode are shown. In the series neutral point mode, the control device 100 opens the disconnect switch 55. This can avoid a situation where the second electrical device 90 fails. On the other hand, the operation of the first electrical device 80 is permitted.

[0095] In the series neutral point mode, the control device 100 performs a switching operation of the inverter 20 based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72, so that power can be transmitted from one of the first battery 31 and the second battery 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. In this switching operation, the upper arm switch SWH and the lower arm switch SWL corresponding to at least one are alternately turned on. As a result, for example, when the driving mode is selected, the vehicle CA can be driven while the charging rates (SOC) of the first battery 31 and the second battery 32 are equalized.

[0096] In addition, the control device 100 performs the same Fig.10 The same action state control process.

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

[0098] Fig.25 The operation state of each switch in mode 1 is shown. 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 arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the inter-negative bypass switch 50. As a result, only the first battery 31 of the first battery 31 and the second battery 32 is charged by the low-voltage DC charger 210. In addition, the control device 100 turns on the cut-off switch 55 in mode 1. As a result, power can be supplied from the first battery 31 to the second electrical device 90, and the operation of the second electrical device 90 is allowed. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

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

[0100] Fig. 27 1 and 2 show the operation states of the switches in mode 3. In mode 3, the control device 100 turns off the inter-battery switch 40 and turns on the inter-negative electrode bypass switch 50 and the motor side switch 60. In mode 3, similarly to the first embodiment, the charging power of the first storage battery 31 and the second storage battery 32 can be adjusted individually based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72.

[0101] Furthermore, the control device 100 turns on the disconnect switch 55 in mode 3. This allows power to be supplied from the first battery 31 and the second battery 32 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0102] Fig.28 The operating state of each switch in the low-voltage AC charging mode is shown. In the low-voltage AC charging mode, the control device 100 disconnects the inter-battery switch 40, the motor side switch 60, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the negative electrode bypass switch 50. As a result, only the first battery 31 of the first battery 31 and the second battery 32 is charged by the onboard charger 92. In addition, the control device 100 turns on the disconnection switch 55 in the low-voltage AC charging mode. As a result, power can be supplied from the first battery 31 to the second electrical device 90, and the operation of the second electrical device 90 is allowed. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0103] in addition, Fig.28 The operation states of the inter-battery switch 40, the inter-negative electrode bypass switch 50, the motor side switch 60 and the inverter 20 in the low-voltage AC charging mode shown are the same as those described above. Fig.25 In addition, the above-mentioned operation state in the low voltage AC charging mode is the same as the first embodiment, and can also be the same as the previous Fig.26 The operating state corresponding to the mode 2 shown in the figure, or the previous Fig. 27 Mode 3 shown corresponds to the operating state.

[0104] Fig.29 The operating state of each switch in the temperature rise mode of the battery is shown. 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 inter-negative bypass switch 50 and the motor side switch 60. The control device 100 performs a switch operation of the inverter 20 in the same manner as in the first embodiment, for example, so that the AC charge and discharge current flows between the first battery 31 and the second battery 32 via the armature winding 11 and the inverter 20 until the battery temperature Tbat reaches the target temperature Tth. In addition, the control device 100 turns on the disconnection switch 55 in the temperature rise mode. As a result, the operation of both the first electrical device 80 and the second electrical device 90 is allowed.

[0105] In addition, the control device 100 performs the same Fig.16 The same action state control process.

[0106] When the motor-side switch 60 is turned on, if the voltage between the terminals of the second battery 32 is too high relative to the voltage between the terminals of the first battery 31, a large current flows from the second battery 32 to the first battery 31 via the motor-side electrical path 25, the armature winding 11, the upper arm diode DH connected in reverse 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 or the batteries 31 and 32 may be reduced.

[0107] In order to suppress the occurrence of such a situation, in the present 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] The difference between the terminal voltage of the first battery 31 and the terminal voltage of the second battery 32 may increase due to discharge from the first battery 31 and the second battery 32. Therefore, the control device 100 adjusts the power consumption or operating frequency of the first electrical device 80 so that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB becomes less than the voltage threshold value Vj. Specifically, the control device 100 adjusts the power consumption or operating frequency of the first electrical device 80 so that the first detection voltage VA becomes greater than or equal to the second detection voltage VB and the absolute value of the difference becomes less than or equal to the specified value.

[0109] In addition, when the control device 100 adjusts the power consumption of the first electrical device 80, it is sufficient to make 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 electrical device 80 and the second electrical device 90 refers to the total value of the power consumption of the plurality of electrical devices when the electrical device is a plurality of electrical devices. For example, the power consumption of the second electrical device 90 is the total value of the power consumption of the second DCDC converter 91 and the onboard charger 92, etc. 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 is greater than the discharge power of the first storage battery 31, and it is easy to achieve the relationship of "|VA-VB|≤prescribed value".

[0110] In addition, when the control device 100 adjusts the operating frequency of the first electrical device 80, it is sufficient to make the operating frequency of the first electrical device 80 higher than the operating frequency of the second electrical device 90. Here, the operating frequency refers to the ratio of the operating period Topr of the electrical device in the prescribed period Ttl (=Topr / 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 prescribed period Ttl is, for example, the execution period of each charging mode. In addition, when the control mode is the driving mode, the prescribed period Ttl is, for example, one trip of the vehicle CA. For example, one trip is the period from when the user turns on the start switch of the vehicle CA to when the user turns off the start switch. By making the operating frequency of the first electrical device 80 higher than the operating frequency of the second electrical device 90, the total value of the power consumption of the first electrical device 80 in the prescribed period Ttl is greater than the total value of the power consumption of the second electrical device 90 in the prescribed period Ttl. As a result, it is easy to achieve the relationship of "|VA-VB|≤predetermined value".

[0111] <Modification of the 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 make the power consumption of the second electric device 90 smaller than the power consumption of the first electric device 80 .

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

[0114] Similar to the second embodiment, the allowable input voltage of the second electrical device 90 may be a voltage (e.g., 800 V) that is higher than the allowable input voltage of the first electrical device 80 and is equal to the sum of the voltages (e.g., rated voltages) between the terminals of the first storage battery 31 and the second storage battery 32. In this case, the control device 100 performs the same operation as in the previous embodiment. Fig.18 The same action state control processing is sufficient.

[0115] in addition, Fig.30 1 shows the operation state of each switch in the series neutral point mode in this case. In the series neutral point mode, the control device 100 turns off the low potential side main switch SMRL and turns on the disconnection switch 55, similarly to the second embodiment. In this case, when the control mode is set to the driving mode, the control device 100 allows the operation of the first electrical device 80 and the second electrical device 90, and can perform the switching operation of the inverter 20 that uses only the first battery 31 of the first battery 31 and the second battery 32 as the driving power source of the motor 10. In addition, the control device 100 can also perform temperature increase control of the first battery 31 and the second battery 32 by performing the switching operation of the inverter 20.

[0116] <Fourth embodiment> Hereinafter, referring to the accompanying drawings, the fourth embodiment will be described with a focus on the differences from the first embodiment. Fig.31 As shown, the second electrical device 90 is electrically connected in parallel with the second battery 32 (equivalent to the "target power storage unit"). In addition, the rated voltage of the first battery 31 is a voltage higher than the rated voltage of the second battery 32, and more specifically, a voltage higher than the rated voltage of the second battery 32. In addition, the allowable input voltage of the second electrical device 90 is lower than the total value of the terminal voltage (e.g., rated voltage) of the first battery 31 and the second battery 32, and is, for example, the same voltage as the allowable input voltage of the first electrical device 80. In addition, the maximum power consumption P2max of the second electrical device 90 is less than the maximum power consumption P1max of the first electrical device 80. In the case where the electrical device is composed of a plurality of electrical devices, the maximum power consumption of the electrical device refers to the total value of the maximum power consumption of each electrical device.

[0117] Fig.32 The following is a diagram showing the steps of an 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. The sleep state refers to a state in which 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 dormant state, the process proceeds to step S41, where the operation of the first electrical device 80 is prohibited and the operation of the second electrical device 90 is permitted. This is to improve the efficiency of the power conversion device. That is, the DCDC converter as an electrical device has the characteristic that the smaller the difference between the input and output voltages, the smaller the current (e.g., dark current) flowing through the DCDC converter becomes, and the higher the power conversion efficiency becomes. Therefore, by operating the second DCDC converter 91 connected to the second battery 32 with a lower rated voltage among the first battery 31 and the second battery 32, the efficiency in the power conversion device can be improved.

[0120] In addition, since the second DCDC converter 91 of the second electrical device 90 can be operated, power can be supplied from the second battery 32 with a relatively large power storage capacity to the low-voltage battery 110 with a relatively small power storage capacity and the control device 100 via the second DCDC converter 91. As a result, the power supply to the control device 100 can be appropriately maintained. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, the advantage of being able to supply power from the second battery 32 to the control device 100 via the second DCDC converter 91 is greater.

[0121] The second electric device 90 is always connected to the second storage battery 32 without passing through a disconnect switch such as a relay. Therefore, there is no need to operate the disconnect switch in the sleep state, and power can be appropriately 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 between the terminals of the second battery 32 is too high relative to the voltage between the terminals of the first battery 31, a large current may flow from the second battery 32 to the first 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. In order to solve this problem, the control device 100 adjusts the power consumption or operating frequency of the second electrical device 90 so that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB becomes less than the above-mentioned specified value. Specifically, the control device 100 adjusts the power consumption or operating frequency of the second electrical device 90 so that the first detection voltage VA becomes greater than the second detection voltage VB, and the absolute value of the above-mentioned difference becomes less than the specified value. This adjustment can be performed by the method of the third embodiment.

[0123] When the control device 100 adjusts the power consumption of the second electrical device 90, it is sufficient to make the power consumption of the second electrical device 90 greater than the power consumption of the first electrical device 80. Here, the power consumption of the first electrical device 80 and the second electrical device 90 refers to the total value of the power consumption of the plurality of electrical devices when the electrical device is composed of a plurality of electrical devices. By making the power consumption of the second electrical device 90 greater than the power consumption of the first electrical device 80, the discharge power of the second storage battery 32 is greater than the discharge power of the first storage battery 31, and it is easy to achieve the relationship of "VA-VB≤predetermined value".

[0124] In addition, when the control device 100 adjusts the operating frequency of the first electrical device 80, it is sufficient to make the operating frequency of the first electrical device 90 higher than the operating frequency of the second electrical device 80. Here, the operating frequency is the same as the definition of the third embodiment. By making the operating frequency of the second electrical device 90 higher than the operating frequency of the first electrical device 80, the total value of the power consumption of the second electrical device 90 during the prescribed period Ttl is made greater than the total value of the power consumption of the first electrical device 80 during the prescribed period Ttl. As a result, it is easy to achieve the relationship of "VA-VB≤prescribed value".

[0125] Fig.33 The following is a diagram showing the steps of an operation state control process executed by the control device 100 . Fig.33 The processing is performed 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 in an operating state rather than in a sleeping state. For example, when the control device 100 is activated (for example, when the travel mode or any of the charging modes is selected), it is determined to be in an operating state.

[0127] If an affirmative determination is made in step S50, the process proceeds to step S51 to determine whether an abnormality has occurred in the first battery 31. If it is determined in step S51 that the first battery 31 is normal, the process proceeds to step S52 to determine whether an abnormality has occurred in the second battery 32.

[0128] If it is determined in step S52 that the second battery 32 is normal, the process proceeds to step S53 , and the operations of the first electric device 80 and the second electric device 90 are 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. 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 electrical device 90 is prohibited and the operation of the first electrical device 80 is permitted. In step S55, the inter-battery switch 40 may be turned off.

[0131] according to Fig.33 The processing shown, for example, when the control mode is the running mode, can continue the drive control of the electric device using a normal battery even if an abnormality occurs in either the first battery 31 or the second battery 32 .

[0132] <Modification of the Fourth Embodiment> In order to maintain the relationship of “|VA−VB|≤predetermined value”, the control device 100 may charge the first battery 31 from the low voltage battery 110 via the first DCDC converter 81 functioning as a charging device.

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

[0134] <Fifth embodiment> Hereinafter, referring to the accompanying drawings, the fifth embodiment will be described with a focus on the differences from the first embodiment. Fig.34 As shown, the power conversion device includes a positive electrode bypass switch 51, excluding the previous Figure 1 The negative electrode bypass switch 50 is shown. The motor side electric path 25 connects the neutral point of the armature winding 11 to a portion of the inter-battery electric path 24 closer to the first battery 31 than the inter-battery switch 40. The motor side switch 61 is provided in the motor side electric path 25.

[0135] The first electrical device 80 is electrically connected in parallel with the second battery 32 instead of the first battery 31 .

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

[0137] Fig.35 The operation state of each switch in the high-voltage DC charging mode is shown. 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 arm switch SWH and the lower arm switch SWL of the inverter 20. As a result, the first battery 31 and the second battery 32 are connected in series with the high-voltage DC charger 200, and the first battery 31 and the second battery 32 are charged. In addition, the control device 100 turns off the disconnection switch 55 in the high-voltage DC charging mode. As a result, the situation in which the second electrical device 90 fails can be avoided.

[0138] On the other hand, the control device 100 allows the operation of the first electrical device 80 in the high-voltage DC charging mode. Therefore, when there is an operation request for the first electrical device 80, the control device 100 uses the second storage battery 32 as a power supply source to operate the first electrical device 80, thereby avoiding the occurrence of a situation where both the first electrical device 80 and the second electrical device 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 battery 110 and the control device 100. As a result, the power supply to the control device 100 in the high-voltage DC charging mode can be appropriately maintained. In addition, when the low-voltage system does not include the low-voltage battery 110, the advantage of being able to supply power to the control device 100 from the second battery 32 via the first DCDC converter 81 is greater.

[0140] Fig.36 The operation states of the switches in the driving mode of the vehicle CA are shown. In the driving mode, the control device 100 turns on the inter-battery switch 40 and turns off the inter-positive bypass switch 51 and the motor-side switch 61. In addition, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0141] In addition, the control device 100 turns off the cut-off switch 55 in the driving mode and prohibits the operation of the second electrical device 90. This can avoid a situation where the second electrical device 90 fails. On the other hand, the control device 100 allows the operation of the first electrical device 80 in the driving mode. Therefore, the control device 100 operates the first electrical device 80 when there is an operation request for the first electrical device 80, thereby avoiding a situation where both the first electrical device 80 and the second electrical device 90 cannot operate in the driving mode.

[0142] Since the first DCDC converter 81 can be operated in the driving mode, power can be supplied from the second battery 32 via the first DCDC converter 81 to the low-voltage battery 110 and the control device 100. As a result, the power supply to the control device 100 in the driving mode can be properly maintained. As a result, the control device 100 can continue to control the drive of the electric motor 10, and the occurrence of a situation where the vehicle CA cannot travel can be avoided. In addition, in the case where the low-voltage system does not include the low-voltage battery 110, in order to enable the vehicle CA to travel, the advantage of being able to supply power from the second battery 32 via the first DCDC converter 81 to the control device 100 is greater.

[0143] In driving mode, except for Fig.36 In addition to using both the first battery 31 and the second battery 32 as the driving power source of the motor 10, for example Fig.37 , Fig.38 and Fig.39 As shown, a one-side mode can be implemented in which only one of the first battery 31 and the second battery 32 is used as a driving power source.

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

[0145] Furthermore, the control device 100 turns on the disconnect switch 55 in the single-side mode 1. This allows the second battery 32 to supply power to the first and second electrical devices 80 and 90 , so the control device 100 permits the first and second electrical devices 80 and 90 to operate.

[0146] Fig.38 1 shows the operation state of each switch in the single-side mode 2. In the single-side mode 2, the control device 100 turns off the inter-battery switch 40 and the inter-positive bypass switch 51, and turns on the motor-side switch 61. In addition, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0147] Furthermore, the control device 100 turns on the disconnect switch 55 in the single-side mode 2. This allows the second battery 32 to supply power to the first electrical device 80 and the first battery 31 to supply power to the second electrical device 90. Therefore, the control device 100 allows the first electrical device 80 and the second electrical device 90 to operate.

[0148] Fig.39 1 shows the operation state of each switch in the single-side mode 3. In the single-side 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, in order to make the motor 10 generate torque and make the vehicle CA travel, the control device 100 turns on the upper arm switch SWH and the lower arm switch SWL alternately in each phase.

[0149] In addition, the control device 100 can supply power from the second storage battery 32 to the first electrical device 80 in the single-sided mode 3, and therefore allows the operation of the first electrical device 80. On the other hand, the control device 100 turns off the disconnection switch 55 in the single-sided mode 3. This is to prevent the voltage of the series connection of the first storage battery 31 and the second storage battery 32 from being applied to the second electrical device 90, thereby preventing the second electrical device 90 from malfunctioning.

[0150] Fig.40 The operation state of each switch in the parking mode of the vehicle CA is shown. In the parking mode, the control device 100 turns off the inter-battery switch 40, the inter-positive bypass switch 51, the motor side switch 61, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20. In addition, the control device 100 turns off the disconnection switch 55 in the parking mode and prohibits the operation of the second electrical device 90.

[0151] in addition, Fig.41 The operation state of each switch in the series neutral point mode of the present embodiment is shown. The series neutral point mode of the present embodiment is a mode in which the inter-battery switch 40 and the motor side switch 61 are turned on, and the positive electrode bypass switch 51 is turned off. The control device 100 turns off the disconnection switch 55 in the series neutral point mode. As a result, the situation in which the second electrical device 90 fails can be avoided. On the other hand, the operation of the first electrical device 80 is allowed.

[0152] In the series neutral point mode, the control device 100 performs a switching operation of the inverter 20 based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72, similarly to the first embodiment, and can transmit power from one of the first battery 31 and the second battery 32 to the other via the inverter 20, the armature winding 11, and the motor-side electrical path 25. Thus, for example, when the running mode is selected, the vehicle CA can be driven while the charge rates (SOCs) of the first battery 31 and the second battery 32 are equalized.

[0153] In addition, the control device 100 performs the previous Fig.10 The action state shown controls the process.

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

[0155] Fig.421 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 arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the inter-positive electrode bypass switch 51. As a result, only the second battery 32 of the first battery 31 and the second battery 32 is charged by the low voltage DC charger 210. In mode 1, the first battery 31 is not charged.

[0156] Furthermore, the control device 100 turns on the disconnect switch 55 in mode 1. This allows the second battery 32 to supply power to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0157] Fig.43 1 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 electrode bypass switch 51, and the upper arm switch SWH of the inverter 20, and turns on the motor side switch 61 and the lower arm switch SWL of at least one phase of the inverter 20. As a result, only the first battery 31 of the first battery 31 and the second battery 32 is charged by the low voltage DC charger 210. In mode 2, the second battery 32 is not charged.

[0158] Furthermore, the control device 100 turns on the cutoff switch 55 in mode 2. This allows power to be supplied from the first battery 31 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0159] Fig.44 1 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, similarly to the first embodiment, the charging power of the first storage battery 31 and the second storage battery 32 can be adjusted individually based on the detection values ​​of the first current sensor 73 and the second current sensor 74 and the first voltage sensor 71 and the second voltage sensor 72. This adjustment can be implemented by alternately turning on the upper arm switch SWH and the lower arm switch SWL corresponding to at least one of the inverters 20, or repeatedly turning on and off the lower arm switch SWL corresponding to at least one of the inverters 20, and turning off the upper arm switch SWH. Here, by adjusting the ratio of the on period Ton of the upper arm switch SWH to one switching cycle Tsw, that is, the duty ratio (Ton / Tsw), the charging power of the first storage battery 31 and the second storage battery 32 can be adjusted individually. According to mode 3, both the first storage battery 31 and the second storage battery 32 can be charged.

[0160] Furthermore, the control device 100 turns on the disconnect switch 55 in mode 3. This allows power to be supplied from the first battery 31 and the second battery 32 to the second electrical device 90, and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0161] Fig.45 1 shows the operation 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 61, and the upper arm switch SWH and the lower arm switch SWL of the inverter 20, and turns on the inter-positive electrode bypass switch 51. As a result, only the second battery 32 of the first battery 31 and the second battery 32 is charged by the onboard charger 92.

[0162] Furthermore, the control device 100 turns on the cutoff switch 55 in the low voltage AC charging mode. This allows the second battery 32 to supply power to the second electrical device 90 and allows the second electrical device 90 to operate. Therefore, both the first electrical device 80 and the second electrical device 90 can be operated.

[0163] in addition, Fig.45 The operation states of the inter-battery switch 40, the inter-positive electrode bypass switch 51, the motor side switch 61 and the inverter 20 in the low voltage AC charging mode shown are the same as those previously described. Fig.42 In addition, the above operating state in the low voltage AC charging mode can also be the same as the previous Fig.43 The operating state corresponding to the mode 2 shown in the figure, or the previous Fig.44 The operation state corresponding to the mode 3 shown. In the operation state corresponding to the mode 2, only the first battery 31 of the first battery 31 and the second battery 32 is charged by the onboard charger 92. In the operation state corresponding to the mode 3, the control device 100 can charge both the first battery 31 and the second battery 32 through the onboard charger 92. In this case, by adjusting the duty ratio (Ton / Tsw) of the on period Ton of the upper arm switch SWH relative to one switching cycle Tsw, the charging power of the first battery 31 and the second battery 32 can be adjusted separately.

[0164] Fig.46The operating state of each switch in the temperature rise mode of the battery is shown. In the temperature rise mode, the control device 100 turns off the inter-battery switch 40 and the high-potential side main switch SMRH, and turns on the positive electrode bypass switch 51 and the motor side switch 61. The control device 100, for example, performs a switching operation of the inverter 20 so that the AC charging and discharging current flows between the first battery 31 and the second battery 32 via the armature winding 11 and the inverter 20 until the battery temperature Tbat reaches the target temperature Tth. The switching operation here is a switching operation of alternately turning on the upper arm switch SWH and the lower arm switch SWL in at least one phase. In addition, the control device 100 turns on the disconnection switch 55 in the temperature rise mode. Thereby, the operation of both the first electrical device 80 and the second electrical device 90 is allowed.

[0165] In addition, the control device 100 performs the previous Fig.16 The action state shown controls the process.

[0166] According to the present embodiment described above, the same effects as those of the first embodiment can be achieved.

[0167] <Modification of the Fifth Embodiment> When the control device 100 determines that the value obtained by subtracting the first detection voltage VA from the second detection 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 detection voltage VA and the second detection voltage VB approaches 0. In this way, the voltages between the terminals of the first storage battery 31 and the second storage battery 32 can be balanced.

[0168] In order to maintain the relationship of “|VB−VA|≦ΔVjde”, the control device 100 may charge the second battery 32 from the low voltage battery 110 via the first DCDC converter 81 .

[0169] The rated voltage of the second battery 32 (e.g., 400V) may be higher than the rated voltage of the first battery 31 (e.g., 200V). In this case, for example, the allowable input voltage of the first electrical device 80 may be the same voltage as the rated voltage of the second battery 32, and the allowable input voltage of the second electrical device 90 may be the same voltage as the rated voltage of either the first battery 31 or the second battery 32. In addition, when the rated voltage of the second battery 32 is different from the rated voltage of the first battery 31, 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 above-mentioned specified value when it is determined that the value obtained by subtracting the first detection voltage VA from the second detection voltage VB exceeds the above-mentioned voltage threshold value Vj.

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

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

[0172] When the motor side switch 61 is turned on, if the voltage between the terminals of the first battery 31 is too high relative to the voltage between the terminals of the second battery 32, a closed circuit is formed including the first battery 31, the positive electrode bypass switch 51, the lower arm diode DL connected in reverse parallel to the lower arm switch SWL, the armature winding 11 and the motor side electrical path 25, and a large current flows from the first battery 31 to the second battery 32.

[0173] Therefore, when the first electric device 80 is electrically connected in parallel with the first storage battery 31 , the control device 100 may adjust the power consumption or operating frequency of the first electric device 80 so as to maintain the relationship of “|VB−VA|≤ΔVjde”, similarly to the third embodiment.

[0174] <Sixth embodiment> Hereinafter, the sixth embodiment will be described with reference to the drawings, focusing on the differences from the fifth embodiment. In this embodiment, similarly to the second embodiment, the allowable input voltage of the second electrical device 90 is a voltage (e.g., 800 V) that is higher than the allowable input voltage of the first electrical device 80 and is the same as the sum of the terminal voltages (e.g., rated voltages) of the first storage battery 31 and the second storage battery 32. That is, the second electrical device 90 has a high withstand voltage.

[0175] Fig.47 The operating state of each switch when the control mode is the high-voltage AC charging mode is shown. 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 arm switch SWH and the lower arm switch SWL of the inverter 20. As a result, both the first battery 31 and the second battery 32 are charged by the onboard charger 92. In addition, in the high-voltage AC charging mode, the control device 100 turns on the disconnection switch 55 and allows the operation of both the first electrical device 80 and the second electrical device 90.

[0176] In addition, the control device 100 performs the previous Fig.18 The action state shown controls the process.

[0177] in addition, Fig.48The operating state of each switch in the series neutral point mode is shown. In the series neutral point mode, the control device 100 disconnects the high potential side main switch SMRH and turns on the disconnection switch 55. In this case, the control device 100 allows the operation of the first electrical device 80 and the second electrical device 90 when the control mode is set to the driving mode, and can perform the switching operation of the inverter 20 that uses only the second battery 32 of the first battery 31 and the second battery 32 as the driving power supply of the motor 10. In addition, the control device 100 can also perform temperature rise control of the first battery 31 and the second battery 32 by performing the switching operation of the inverter 20. In addition, the control device 100 selects Fig.48 In the control mode shown, just perform the previous Fig.18 The processing of step S33 is sufficient.

[0178] <Seventh embodiment> Hereinafter, referring to the accompanying drawings, the seventh embodiment will be described with a focus on the differences from the fifth embodiment. Fig.49 As shown, the second electrical device 90 is electrically connected in parallel with the first storage battery 31. In addition, the rated voltage of the second storage battery 32 is a voltage higher than the rated voltage of the first storage battery 31, and more specifically, a voltage higher than the rated voltage of the first storage battery 31. In addition, the allowable input voltage of the second electrical device 90 is lower than the total value of the terminal voltage (e.g., rated voltage) of the first storage battery 31 and the second storage battery 32, and is, for example, the same voltage as the allowable input voltage of the first electrical device 80. In addition, the maximum power consumption P2max of the second electrical device 90 is less than the maximum power consumption P1max of the first electrical device 80.

[0179] In addition, in this embodiment, the control device 100 performs Fig.32 and Fig.33 The processing of the fourth embodiment is the same as the processing of the fourth embodiment.

[0180] <Other embodiments> In addition, each of the above-mentioned embodiments may be implemented with the following modifications.

[0181] ·exist Fig.31 and Fig.49 In the structure of the first electrical device 80 and the second electrical device 90, the first electrical device 80 and the second electrical device 90 may be electrically connected to the first storage battery 31 and the second storage battery 32 via the disconnect switch. Figure 1 , Fig. 20 , Fig.31 The structure shown may further include a positive electrode bypass switch 51 .

[0182] In the previous Fig.34 , Fig.49 The structure shown may further include a negative electrode bypass switch 50 .

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

[0184] Specifically, the first end of the common path 26 is connected to the neutral point of the armature winding 11. The first end of the first electric path 27 is connected to the second end of the common path 26, and the portion of the inter-battery electric path 24 that is closer to the second battery 32 than the inter-battery switch 40 is connected to the second end of the first electric path 27. In addition, the first end of the second electric path 28 is connected to the second end of the common path 26, and the portion of the inter-battery electric path 24 that is closer to the first battery 31 than the inter-battery switch 40 is connected to the second end of the second electric path 28. The first motor side switch 60 is provided in the first electric path 27. The second motor side switch 61 is provided in the second electric path 28. In addition, instead of providing the common path 26, the first ends of the first electric path 27 and the second electric path 28 may be connected to the neutral point of the armature winding 11 at their respective first ends.

[0185] ·It is not necessary to provide a motor-side switch in the motor-side electrical path.

[0186] The connection destination of the motor side electric path 25 is not limited to the neutral point of the armature winding 11, and may be, for example, the middle portion of the armature winding 11. In addition, the connection destination of the motor side electric path 25 may be the conductive member 23. In this case, for example, Figure 1 Taking the structure shown as an example, it is sufficient to disconnect the upper arm switch SWH and the lower arm switch SWL of the phase in which the motor side electrical path 25 is connected to the conductive component 23 in each phase of the inverter 20, and use the upper arm switch SWH and the lower arm switch SWL in at least one phase other than the phase in which the motor side electrical path 25 is connected to the conductive component 23 for the control of each control mode.

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

[0188] The positive terminal of the first storage battery 31 and the high potential side electric path 22H may be connected via a first fuse. In addition, the negative terminal of the second storage battery 32 and the low potential side electric path 22L may be connected via 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 plurality of switches connected in series or a plurality of switches connected in parallel.

[0190] The switch of the inverter 20 is not limited to an IGBT with a freewheeling diode connected in antiparallel, but may be, for example, an N-channel MOSFET including a body diode. In this case, the high potential terminal of the N-channel MOSFET is the drain, and the low potential terminal is the source.

[0191] The electric motor is not limited to a star-connected electric motor, but may be a delta-connected electric motor. In addition, the electric motor and inverter are not limited to a three-phase electric motor, but may be a two-phase electric motor or a four-phase or more electric motor. In addition, the electric motor is not limited to a permanent magnet type synchronous machine having a permanent magnet as an excitation pole in the rotor, but may be a winding excitation type synchronous machine having an excitation coil as an excitation pole in the rotor. In this case, both the excitation winding and the permanent magnet may be included in the rotor. In addition, the electric 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, and may include, for example, a large-capacity electric double layer capacitor, or both a storage battery and an electric double layer capacitor.

[0193] The mobile object on which the power conversion device is installed is not limited to a vehicle, and may be, for example, an airplane or a ship. In addition, the object on which the power conversion device is installed is not limited to a mobile object, and may be a stationary device.

[0194] ·The control unit and the method thereof described in the present disclosure may also be implemented by a special-purpose computer, which is provided by constituting a processor and a memory, and the above-mentioned processor is programmed to execute one or more functions embodied by a computer program. Alternatively, the control unit and the method of the control unit described in the present disclosure may be implemented by a special-purpose computer, which is provided by constituting a processor composed of one or more special-purpose hardware logic circuits. Alternatively, the control unit and the method of the control unit described in the present disclosure may be implemented by one or more special-purpose computers, which are constituted by a combination of a processor and a memory programmed to execute one or more functions and a processor constituted by one or more hardware logic circuits. In addition, the computer program may also be stored in a computer-readable non-temporary tangible recording medium as an instruction executed by a computer.

[0195] · Hereinafter, characteristic structures extracted from the above-mentioned embodiments will be described. [Structure 1] A power conversion device, comprising: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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 An electric motor (10), the electric motor having an armature winding (11), the armature winding (11) being electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit and the positive terminals of the first power storage unit and the second power storage unit; A motor-side electrical path (25-28), wherein the motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device (80) which can be electrically connected in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit, or can electrically connect the high potential side electrical path to the low potential side electrical path; and A second electrical device (90) is electrically connectable between the high potential side electrical path and the low potential side electrical path to a connection destination other than the first electrical device in the first power storage unit and the second power storage unit. [Structure 2] The power conversion device as described in Structure 1, wherein: The first electrical device is connectable in parallel with the target power storage unit. The second electrical device can electrically connect the high potential side electrical path and the low potential side electrical path. [Structure 3] The power conversion device as described in structure 2, wherein the power conversion device comprises: a high potential side main switch (SMRH) for electrically connecting or disconnecting the high potential side terminal of the upper arm switch and the positive terminal of the first power storage unit; and a low potential side main switch (SMRL), the low potential side main switch (SMRL) electrically connecting or disconnecting the low potential side terminal of the lower arm switch and the negative terminal of the second power storage unit, The 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. When the switch between power storage units, the high potential side main switch, and the low potential side main switch are turned on, the operation of the second electrical device is prohibited, and the operation of the first electrical device is permitted. [Structure 4] The power conversion device as described in Structure 2, wherein: The 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. A control unit (100) is included which allows at least one of the first electrical device and the second electrical device to operate when the switch between the power storage units is opened. [Structure 5] The power conversion device as described in Structure 2, wherein: The 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. The invention comprises a control unit (100) which allows the operation of at least one of the first electric device and the second electric device when the armature winding can be energized only from one of the first electric storage unit and the second electric storage unit. [Structure 6] A power conversion device as described in any one of Structures 3 to 5, wherein: The allowable input voltage of the first electrical device and the allowable input voltage of the second electrical device are the same voltage. [Structure 7] A power conversion device as described in any one of Structures 3 to 6, wherein: The voltage of the target power storage unit is a voltage 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. [Structure 8] The power conversion device as described in structure 4 or 5, wherein: At least one of the first electrical device and the second electrical device includes a DCDC converter (81, 91), The DCDC converter steps down an input voltage and supplies the stepped-down input voltage to the control unit. [Structure 9] The power conversion device as described in Structure 2, wherein: The allowable input voltage of the second electrical device is a voltage higher than the allowable input voltage of the first electrical device. [Structure 10] The power conversion device as described in structure 9, wherein: The allowable input voltage of the second electric device is a voltage equal to a total value of a voltage of the first power storage unit and a voltage of the second power storage unit. [Structure 11] The power conversion device as described in structure 9 or 10, wherein: The invention comprises a control unit (100) which permits the operation of the second electrical device on the condition that the switch between the power storage units is turned on. [Structure 12] The power conversion device as described in structure 11, wherein: The second electrical 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 control unit turns on the switch between power storage units when charging is performed by the internal charger. [Structure 13] A power conversion device as described in any one of Structures 2 to 12, wherein: The bypass switch is an inter-negative electrode bypass switch (50) that electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch. The target power storage unit is the first power storage unit. [Structure 14] A power conversion device as described in any one of Structures 2 to 12, wherein: The bypass switch is a positive electrode bypass switch (51) that electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch. The target power storage unit is the second power storage unit. [Structure 15] The power conversion device as described in Structure 1, wherein: The bypass switch is an inter-negative electrode bypass switch (50) that electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch. The first electrical device can be electrically connected in parallel with the first power storage unit, or can electrically connect the high potential side electrical path and the low potential side electrical path. The second electrical device is electrically connectable in parallel with the second power storage unit as the target power storage unit. The voltage of the first power storage unit is equal to or higher than the voltage of the second power storage unit. [Structure 16] The power conversion device as described in Structure 1, wherein: The bypass switch is a positive electrode bypass switch (51) that electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch. The first electrical device can be electrically connected in parallel with the second power storage unit, or can electrically connect the high potential side electrical path and the low potential side electrical path. The second electrical device is electrically connectable in parallel with the first power storage unit as the target power storage unit. The voltage of the second power storage unit is equal to or higher than the voltage of the first power storage unit. [Structure 17] The power conversion device as described in structure 15 or 16, wherein: The maximum power consumption of the second electrical device is smaller than the maximum power consumption of the first electrical device. [Structure 18] The power conversion device as described in structure 15 or 16, wherein: The control unit allows the operation of the second electrical device and prohibits the operation of the first electrical device in the sleep state of the power conversion device. [Structure 19] The power conversion device as described in structure 17 or 18, wherein: The second electrical device comprises a DCDC converter (91), The DCDC 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. [Structure 20] The power conversion device as described in structure 15 or 16, wherein: The invention comprises a control unit (100) which makes the power consumption of the second electrical device greater than the power consumption of the first electrical device. [Structure 21] The power conversion device as described in structure 20, wherein: The control unit makes power consumption of the second electric device greater than power consumption of the first electric device so that a voltage of the target power storage unit becomes 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. [Structure 22] The power conversion device as described in structure 15 or 16, wherein: A control unit (100) is included, wherein the control unit makes the operating frequency of the second electrical device higher than the operating frequency of the first electrical device. [Structure 23] The power conversion device as described in structure 22, wherein: The control unit makes the operating frequency of the second electric device higher than the operating frequency of the first electric device so that the voltage of the target power storage unit becomes equal to or higher than the voltage of the power storage unit other than the target power storage unit among the first power storage unit and the second power storage unit. [Structure 24] The power conversion device as described in structure 15 or 16, wherein: The first electrical device includes a charging device (81) capable of supplying electric power to a storage unit other than the target storage unit among the first storage unit and the second storage unit. The second electrical device includes a discharge device (91) which is an electrical device capable of consuming electric power of the target power storage unit. [Structure 25] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding (11) being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit and the positive terminals of the first power storage unit and the second power storage unit; a high potential side main switch (SMRH) for electrically connecting or disconnecting the high potential side terminal of the upper arm switch and the positive terminal of the first power storage unit; a low potential side main switch (SMRL) for electrically connecting or disconnecting the low potential side terminal of the lower arm switch and the negative terminal of the second power storage unit; A motor-side electrical path (25-28), wherein the motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the switch between power storage units, the high potential side main switch, and the low potential side main switch are turned on, the operation of the second electrical device is prohibited, and the operation of the first electrical device is permitted. [Structure 26] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding (11) being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit and the positive terminals of the first power storage unit and the second power storage unit; A motor-side electrical path (25-28), wherein the motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the switch between power storage units is turned off, operation of at least one of the first electric device and the second electric device is permitted. [Structure 27] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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 An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit and the positive terminals of the first power storage unit and the second power storage unit; A motor-side electrical path (25-28), wherein the motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the armature winding can be energized from only one of the first power storage unit and the second power storage unit, operation of at least one of the first electric device and the second electric device is permitted. [Structure 28] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit and the positive terminals of the first power storage unit and the second power storage unit; A motor-side electrical path (25-28), wherein the motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units; a first electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. the allowable input voltage of the second electrical device is a voltage higher than the allowable input voltage of the first electrical device, The program causes the computer to execute the following processing: The operation of the second electrical device is permitted on condition that the switch between the power storage units is turned on. [Structure 29] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a negative electrode bypass switch (50) which electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch; a first electrical device (80) which can be electrically connected in parallel with the first power storage unit or can electrically connect the high potential side electrical path and the low potential side electrical path; and a second electrical device (90) electrically connectable to the second power storage unit, The voltage of the first power storage unit is a voltage greater than the voltage of the second power storage unit. The program causes the computer to execute the following processing: In the sleep state of the power conversion device, the second electrical device is allowed to operate, and the first electrical device is prohibited to operate; making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or The operating frequency of the second electrical device is made higher than the operating frequency of the first electrical device. [Structure 30] A program is applied to a power conversion device, wherein the power conversion device comprises: a high potential side electrical path (22H), the high potential side electrical path being electrically connectable to the positive terminal of the first power storage unit (31); A low potential side electrical path (22L), the low potential side electrical path being electrically connectable to a negative terminal of a second power storage unit (32); An inverter (20), the inverter comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); and a computer (101), The above-mentioned power conversion device comprises: a switch (40) between the storage units, the switch being arranged in an electrical path (24) between the storage units that electrically connects the negative terminal of the first storage unit and the positive terminal of the second storage unit; a positive electrode bypass switch (51) which electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch; a first electrical device (80) which can be electrically connected in parallel with the second power storage unit or can electrically connect the high potential side electrical path and the low potential side electrical path; and a second electrical device (90) electrically connectable to the first power storage unit, The voltage of the second power storage unit is a voltage greater than the voltage of the first power storage unit. The program causes the computer to execute the following processing: In the sleep state of the power conversion device, the second electrical device is allowed to operate, and the first electrical device is prohibited to operate; making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or The operating frequency of the second electrical device is made higher than the operating frequency of the first electrical device.

[0196] Although the present disclosure is described based on the embodiments, it should be understood that the present disclosure is not limited to the above-mentioned embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and methods, and other combinations and methods containing only one element, above or below them, also belong to the scope and thought range of the present disclosure.

Claims

1. A power conversion device, comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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 An electric 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), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; 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 electrical device (80) capable of being electrically connected in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit, or capable of electrically connecting the high potential side electrical path and the low potential side electrical path; and A second electrical device (90) is electrically connectable to a power storage unit other than a connection target of the first electrical device, of the first power storage unit and the second power storage unit, between the high potential side electrical path and the low potential side electrical path.

2. The power conversion device according to claim 1, characterized in that: The first electrical device is connectable in parallel with the target power storage unit. The second electrical device can electrically connect the high potential side electrical path and the low potential side electrical path.

3. The power conversion device according to claim 2, characterized in that: The power conversion device comprises: a high potential side main switch (SMRH) that electrically connects or disconnects the high potential side terminal of the upper arm switch and the positive terminal of the first power storage unit; and a low potential side main switch (SMRL) for electrically connecting or disconnecting the low potential side terminal of the lower arm switch and the negative terminal of the second power storage unit, The 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. A control unit (100) is included which prohibits the operation of the second electrical device and allows the operation of the first electrical device when the switch between the power storage units, the high potential side main switch and the low potential side main switch are turned on.

4. The power conversion device according to claim 2, characterized in that: The 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. The invention comprises a control unit (100) which allows the operation of at least one of the first electrical device and the second electrical device when the switch between the power storage units is opened.

5. The power conversion device according to claim 2, characterized in that: The 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. A control unit (100) is included for allowing the operation of at least one of the first electrical device and the second electrical device when the armature winding can be energized only from one of the first power storage unit and the second power storage unit.

6. The power conversion device according to any one of claims 3 to 5, characterized in that: The allowable input voltage of the first electrical device and the allowable input voltage of the second electrical device are the same voltage.

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

8. The power conversion device according to claim 4 or 5, characterized in that: At least one of the first electrical device and the second electrical device includes a DCDC converter (81, 91), The DCDC converter steps down an input voltage and supplies the voltage to the control unit.

9. The power conversion device according to claim 2, characterized in that: The allowable input voltage of the second electrical device is a voltage higher than the allowable input voltage of the first electrical device.

10. The power conversion device according to claim 9, characterized in that: The allowable input voltage of the second electric device is the same voltage as the total value of the voltage of the first power storage unit and the voltage of the second power storage unit.

11. The power conversion device according to claim 9 or 10, characterized in that: A control unit (100) is included which permits the operation of the second electrical device on the condition that the switch between the power storage units is turned on.

12. The power conversion device according to claim 11, characterized in that: The second electrical 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 control unit turns on the switch between power storage units when charging is performed by the internal charger.

13. The power conversion device according to claim 2, characterized in that: The bypass switch is an inter-negative electrode bypass switch (50) that electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch. The target power storage unit is the first power storage unit.

14. The power conversion device according to claim 2, characterized in that: The bypass switch is a positive electrode bypass switch (51) that electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch. The target power storage unit is the second power storage unit.

15. The power conversion device according to claim 1, wherein: The bypass switch is an inter-negative electrode bypass switch (50) that electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch. The first electrical device can be electrically connected in parallel with the first power storage unit, or can electrically connect the high potential side electrical path and the low potential side electrical path. The second electrical device is electrically connectable in parallel with the second power storage unit as the target power storage unit. The voltage of the first power storage unit is equal to or higher than the voltage of the second power storage unit.

16. The power conversion device according to claim 1, wherein: The bypass switch is a positive electrode bypass switch (51) that electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch. The first electrical device can be electrically connected in parallel with the second power storage unit, or can electrically connect the high potential side electrical path and the low potential side electrical path. The second electrical device is electrically connectable in parallel with the first power storage unit as the target power storage unit. The voltage of the second power storage unit is equal to or higher than the voltage of the first power storage unit.

17. The power conversion device according to claim 15 or 16, characterized in that: The maximum power consumption of the second electrical device is smaller than the maximum power consumption of the first electrical device.

18. The power conversion device according to claim 15 or 16, characterized in that: A control unit (100) is included, which allows the second electrical device to operate and prohibits the first electrical device from operating in a sleep state of the power conversion device.

19. The power conversion device according to claim 17, characterized in that: The second electrical device comprises a DCDC converter (91), The DCDC 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.

20. The power conversion device according to claim 18, characterized in that The second electrical device comprises a DCDC converter (91), The DCDC 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.

21. The power conversion device according to claim 15 or 16, characterized in that: A control unit (100) is included, which makes the power consumption of the second electrical device greater than the power consumption of the first electrical device.

22. The power conversion device according to claim 20, characterized in that: The control unit makes 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 becomes equal to or higher than the voltage of the power storage unit other than the target power storage unit among the first power storage unit and the second power storage unit.

23. The power conversion device according to claim 15 or 16, characterized in that: A control unit (100) is included, which makes the operating frequency of the second electrical device higher than the operating frequency of the first electrical device.

24. The power conversion device according to claim 22, characterized in that: The control unit makes the operating frequency of the second electric device higher than the operating frequency of the first electric device so that the voltage of the target power storage unit becomes equal to or higher than the voltage of the 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 15 or 16, characterized in that: The first electrical device includes a charging device (81) capable of supplying electric power to a storage unit other than the target storage unit among the first storage unit and the second storage unit. The second electrical device includes a discharge device (91) which is an electrical device capable of consuming the electric power of the target power storage unit.

26. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; a high potential side main switch (SMRH) for electrically connecting or disconnecting 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) for electrically connecting or disconnecting the low potential side terminal of the lower arm switch and the negative terminal of 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 electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the switch between power storage units, the high potential side main switch, and the low potential side main switch are turned on, the operation of the second electric device is prohibited, and the operation of the first electric device is permitted.

27. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; 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 electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the switch between power storage units is turned off, operation of at least one of the first electric device and the second electric device is permitted.

28. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; 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 electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. The program causes the computer to execute the following processing: When the armature winding can be energized from only one of the first power storage unit and the second power storage unit, at least one of the first electric device and the second electric device is allowed to operate.

29. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a bypass switch (50, 51) for electrically connecting at least one of the negative terminals of the first power storage unit and the second power storage unit to each other and the positive terminals of the first power storage unit and the second power storage unit to each other; 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 electrical device (80) which is electrically connectable in parallel with a target power storage unit, which is either the first power storage unit or the second power storage unit; and a second electrical device (90) capable of electrically connecting the high potential side electrical path and the low potential side electrical path, The 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. the allowable input voltage of the second electrical device is a voltage higher than the allowable input voltage of the first electrical device, The program causes the computer to execute the following processing: The second electrical device is allowed to operate on condition that the switch between the power storage units is turned on.

30. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a negative electrode bypass switch (50) which electrically connects the negative electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the second storage unit than the inter-storage unit switch; a first electrical device (80) which can be electrically connected in parallel with the first power storage unit or can electrically connect the high potential side electrical path and the low potential side electrical path; as well as a second electrical device (90) electrically connectable to the second power storage unit, The voltage of the first power storage unit is a voltage greater than or equal to the voltage of the second power storage unit. The program causes the computer to execute the following processing: In a dormant state of the power conversion device, allowing the second electrical device to operate and prohibiting the first electrical device from operating; making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or The operating frequency of the second electrical device is made higher than the operating frequency of the first electrical device.

31. A program, the program being applicable to a power conversion device, the power conversion device comprising: a high potential side electrical path (22H) capable of being electrically connected to the positive terminal of the first power storage unit (31); a low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32); An inverter (20) comprising 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; An electric motor (10), the electric motor having an armature winding (11), the armature winding being electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23); as well as Computer (101), The power conversion device comprises: an inter-storage unit switch (40), the inter-storage unit switch being provided in an inter-storage unit electrical path (24) electrically connecting a negative terminal of the first storage unit and a positive terminal of the second storage unit; a positive electrode bypass switch (51) which electrically connects the positive electrode terminal of the first power storage unit to the 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-storage unit electrical path that is closer to the first storage unit than the inter-storage unit switch; a first electrical device (80) which can be electrically connected in parallel with the second power storage unit or can electrically connect the high potential side electrical path and the low potential side electrical path; as well as a second electrical device (90) electrically connectable to the first power storage unit, The voltage of the second power storage unit is a voltage greater than the voltage of the first power storage unit, The program causes the computer to execute the following processing: In a dormant state of the power conversion device, allowing the second electrical device to operate and prohibiting the first electrical device from operating; making the power consumption of the second electrical device greater than the power consumption of the first electrical device; or The operating frequency of the second electrical device is made higher than the operating frequency of the first electrical device.

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