Power conversion device and program

Abstract

A power conversion device provided with a high-potential-side electrical path (22H), a low-potential-side electrical path (22L), an inverter (20) having an upper arm switch (SWH) and a lower arm switch (SWL), and an electric motor (10) having an armature winding (11) electrically connected to a connection point between the upper and lower arm switches via a conductive member (23), the power conversion device being provided with: a switch (40) between power storage units; 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); bypass switches (50, 51) that electrically connect the negative electrode terminals of the first and second power storage units to each other and / or electrically connect the positive electrode terminals of the first and second power storage units to each other; and motor-side electrical paths (25-28) that electrically connect the armature winding or the conductive member and the electrical paths between the power storage units.

Description

[0001] Cross-reference to related applications

[0002] This application is based on Japanese application No. 2022-122116 filed on July 29, 2022, and the contents thereof are cited herein. Technical Field

[0003] The present disclosure relates to a power conversion device and a program. Background Art

[0004] In the past, as described in Patent Document 1, there is a known vehicle-mounted system, which includes an electric motor, an inverter electrically connected to the armature winding of the electric motor, and a first and a second power storage unit. The system includes a relay for switching the connection state of the first and the second power storage units to a series connection state or a parallel connection state. Thus, the first and the second power storage units can be charged regardless of which external charger with a charging voltage of 400V or an external charger with a charging voltage of 800V is used. In addition, when using an external charger with a charging voltage of 400V, since the connection state of the first and the second power storage units is set to a parallel connection state, the first and the second power storage units can be charged by reducing the system voltage.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6930306 Summary of the invention

[0008] It is desirable to simplify the configuration for switching the connection state of the first and second power storage units as much as possible.

[0009] A main object of the present disclosure is to provide a power conversion device and a program that can achieve a simplified configuration.

[0010] The power conversion device disclosed in the present invention comprises:

[0011] a high potential side electrical path capable of being electrically connected to the positive terminal of the first power storage unit;

[0012] a low potential side electrical path electrically connectable to the negative terminal of the second power storage unit;

[0013] an inverter having an upper arm switch electrically connected to the high potential side electrical path and a lower arm switch electrically connected to the low potential side electrical path; and

[0014] The electric motor has an armature winding electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member.

[0015] The power conversion device includes:

[0016] 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;

[0017] a bypass switch for electrically connecting at least one of negative terminals of the first power storage unit and the second power storage unit to each other and positive terminals of the first power storage unit and the second power storage unit to each other; and

[0018] The motor-side electrical path electrically connects the armature winding or the conductive member to the electrical path between the power storage units.

[0019] In the present disclosure, the connection state of the first and second storage units becomes a series connection state by turning on the switch between the storage units and turning on the bypass switch. On the other hand, by turning off the switch between the storage units and turning on the bypass switch, and having a motor side electrical path, the connection state of the first and second storage units becomes a state in which the positive terminal of the second storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding and the inverter, or a state in which the negative terminal of the first storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding and the inverter. At this time, the structure of the motor and the inverter is used. Therefore, it is possible to provide a power conversion device that realizes a simplified structure for switching the connection state of the first and second storage units. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above-mentioned purpose and other purposes, features and advantages of the present disclosure will become more apparent through the following detailed description with reference to the accompanying drawings. The accompanying drawings are:

[0021] Figure 1 is an overall configuration diagram of the system of the first embodiment,

[0022] Figure 2 is a flowchart showing the sequence of charging processing,

[0023] Figure 3 This is a diagram showing the operation of the switch during high-voltage charging.

[0024] Figure 4 This is a diagram showing the operation of the switch during low voltage charging.

[0025] Figure 5 is an overall configuration diagram of the system of the second embodiment,

[0026] Figure 6 is a flowchart showing the sequence of charging processing,

[0027] Figure 7is an overall configuration diagram of the system of the third embodiment,

[0028] Figure 8 is a flowchart showing the sequence of charging processing,

[0029] Fig. 9 This is a diagram showing the operation of the switch during low voltage charging.

[0030] Fig.10 This is a diagram showing the operation of the switch during low voltage charging.

[0031] Fig.11 is an overall configuration diagram of the system of the fourth embodiment,

[0032] Fig.12 is a flowchart showing the sequence of charging processing,

[0033] Fig.13 is an overall configuration diagram of the system of the fifth embodiment,

[0034] Fig.14 is a flowchart showing the sequence of charging processing,

[0035] Fig.15 is an overall configuration diagram of the system of the sixth embodiment,

[0036] Fig.16 is an overall configuration diagram of a system according to a modified example of the sixth embodiment.

[0037] Fig.17 is an overall configuration diagram of a system according to a modified example of the sixth embodiment.

[0038] Fig.18 is an overall configuration diagram of a system according to a modified example of the sixth embodiment.

[0039] Fig.19 is an overall configuration diagram of the system of the seventh embodiment,

[0040] Fig. 20 FIG. 1 is a diagram showing the operation mode of the switch when precharging is performed using the first storage battery.

[0041] Fig.21 FIG. 1 is a diagram showing the operation of the switch when precharging is performed using the second storage battery.

[0042] Fig. 22 is a diagram showing the overall structure of the system of the eighth embodiment.

[0043] Fig.23 FIG. 1 is a diagram showing the operation mode of the switch when precharging is performed using the first storage battery.

[0044] Fig.24is an overall configuration diagram of a system according to a modification of the seventh embodiment.

[0045] Fig.25 is an overall configuration diagram of a system in accordance with another embodiment.

[0046] Fig.26 is an overall configuration diagram of a system in accordance with another embodiment.

[0047] Fig. 27 is an overall configuration diagram of a system in accordance with another embodiment.

[0048] Fig.28 is an overall configuration diagram of a system in accordance with another embodiment.

[0049] Fig.29 is an overall configuration diagram of a system in accordance with another embodiment.

[0050] Fig.30 is an overall configuration diagram of a system in accordance with another embodiment.

[0051] Fig.31 is an overall configuration diagram of a system in accordance with another embodiment.

[0052] Fig.32 is an overall configuration diagram of a system in accordance with another embodiment.

[0053] Fig.33 is an overall configuration diagram of a system in accordance with another embodiment.

[0054] Fig.34 is an overall configuration diagram of a system in accordance with another embodiment.

[0055] Fig.35 is an overall configuration diagram of a system in accordance with another embodiment.

[0056] Fig.36 is an overall configuration diagram of a system in accordance with another embodiment.

[0057] Fig.37 is an overall configuration diagram of a system in accordance with another embodiment.

[0058] Fig.38 is an overall configuration diagram of a system in accordance with another embodiment.

[0059] Fig.39 Yes means Fig.38 The diagram shows the operation mode of the switch during low voltage charging.

[0060] Fig.40 is an overall configuration diagram of a system in accordance with another embodiment.

[0061] Fig.41 This is a diagram showing the overall configuration of a system according to another embodiment. DETAILED DESCRIPTION

[0062] A plurality of embodiments are described with reference to the accompanying drawings. In a plurality of embodiments, functionally and / or structurally corresponding parts and / or associated parts are sometimes marked with the same reference figure numerals, or with different reference figure numerals above the hundredth place. For the corresponding parts and / or associated parts, reference can be made to the description of other embodiments.

[0063] <First embodiment>

[0064] A first embodiment of the power conversion device of the present disclosure will be described below 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 to constitute an in-vehicle system.

[0065] The system is equipped with 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 motor, and includes an armature winding 11 of U, V, and W phases connected in star shape, and a rotor not shown. The armature winding 11 of each phase is arranged in a manner that each is staggered by 120° in electrical angle. The motor 10 is, for example, a permanent magnet synchronous motor. The rotor can transmit power to the drive wheels of the vehicle. Therefore, the motor 10 becomes a source of torque that causes the vehicle to travel.

[0066] The inverter 20 includes a series connection of three-phase upper arm switches SWH and lower arm switches SWL. An upper arm diode DH as a freewheeling diode is connected to the upper arm switch SWH in reverse parallel, and a lower arm diode DL as a freewheeling diode is connected to the lower arm switch SWL in reverse parallel. In the present embodiment, each switch SWH, SWL is an IGBT.

[0067] 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.

[0068] In each phase, the first end of the armature winding 11 is connected to the connection point between the low potential side terminal of the upper arm switch SWH, i.e., the emitter, and the high potential side terminal of the lower arm switch SWL, i.e., the collector, via a conductive component 23 such as a bus bar. 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. Thus, for example, the inductance of the armature windings 11 of each phase is set to be the same.

[0069] 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.

[0070] The system includes a first battery 31 (equivalent to a "first power storage unit") and a second battery 32 (equivalent to a "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 composed of battery cells connected in series as single batteries. The positive terminal of the first battery 31 is connected to a high potential side electrical path 22H, and the negative terminal of the second battery 32 is connected to a low potential side electrical path 22L. The terminal voltages (e.g., rated voltages) of the battery cells constituting the battery pack are set to be the same as each other, for example. The battery cells are, for example, secondary batteries such as lithium-ion batteries.

[0071] Each battery 31, 32 can be charged by an external charger to be described later provided outside the vehicle. The external charger is, for example, a fixed charger. A positive electrode side connection portion that can be connected to the positive terminal of the external charger is provided at 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. A negative electrode side connection portion that can be connected to the negative terminal of the external charger is provided at 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.

[0072] The power conversion device includes a main switch for electrically connecting or disconnecting the first and second storage batteries 31 and 32 with the inverter 20. Specifically, as the main switch, a high potential side main switch SMRH and a low potential side main switch SMRL are provided. In addition, the power conversion device includes a charging switch for electrically connecting or disconnecting the external charger with the first and second storage batteries 31 and 32. Specifically, as the charging switch, a high potential side charging switch DCRH and a low potential side charging switch DCRL are provided. In the present embodiment, each switch SMRH, SMRL, DCRH, DCRL is a mechanical relay. When each switch SMRH, SMRL, DCRH, DCRL is disconnected, the flow of current in both directions is blocked, and when it is turned on, the flow of current in both directions is allowed. In the high potential side electrical path 22H, a high potential side main switch SMRH and a high potential side charging switch DCRH are provided in sequence from the inverter 20 side. In the low potential side electrical path 22L, a low potential side main switch SMRL and a low potential side charging switch DCRL are provided in order from the inverter 20 side. In addition, the high potential side main switch SMRH, the low potential side main switch SMRL, the high potential side charging switch DCRH and the low potential side charging switch DCRL are not limited to mechanical relays, and may be, for example, semiconductor switching elements.

[0073] The power conversion device includes an inter-battery switch 40, a bypass switch 50, and a motor-side switch 60 as switches for switching the connection state of the first storage battery 31 and the second storage battery 32 to either a state of series connection with an external charger or a state of connection via a motor. In the present embodiment, the inter-battery switch 40, the bypass switch 50, and the motor-side switch 60 are mechanical relays. When the inter-battery switch 40, the bypass switch 50, and the motor-side switch 60 are turned off, the flow of current in both directions is blocked, and when they are turned on, the flow of current in both directions is allowed. In addition, the inter-battery switch 40, the bypass switch 50, and the motor-side switch 60 are not limited to mechanical relays, and may also be semiconductor switching elements, for example.

[0074] 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. When the inter-battery switch 40 is turned on, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically connected. On the other hand, when the inter-battery switch 40 is turned off, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically disconnected.

[0075] The bypass switch 50 connects the negative terminal of the first battery 31 to the low potential side electrical path 22L. When the bypass switch 50 is turned on, the negative terminal of the first battery 31 is electrically connected to the negative terminal of the second battery 32. On the other hand, when the bypass switch 50 is turned off, the negative terminal of the first battery 31 and the negative terminal of the second battery 32 are electrically disconnected.

[0076] The motor-side switch 60 is provided in the motor-side electrical path 25, and the motor-side electrical path 25 connects the neutral point of the armature winding 11 on the second battery 32 side of the inter-battery switch 40 in the inter-battery electrical path 24. When the motor-side switch 60 is turned on, the neutral point of the armature winding 11 is electrically connected to the positive terminal of the second battery 32. On the other hand, when the motor-side switch 60 is turned off, the neutral point of the armature winding 11 and the positive terminal of the second battery 32 are electrically disconnected.

[0077] 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 first current sensor 73 is provided in an electrical path connecting the positive terminal of the first battery 31 and the high potential side electrical path 22H. The second current sensor 74 is provided in an electrical path connecting the negative terminal of the second battery 32 and the low potential side electrical path 22L. 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.

[0078] The detection value of each sensor is input to the control device 100 (equivalent to the "control unit") provided in the power conversion device. The control device 100 is mainly composed of a microcomputer 101, and the microcomputer 101 has 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 including a plurality of logic circuits, or an analog circuit. For example, the microcomputer 101 executes a program stored in a non-transitorytangible storage medium (non-transitorytangible storage medium) provided in the microcomputer as a storage unit. The program includes, for example, the following Figure 2The program for performing 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 is, for example, OTA (Over The Air), and can be updated via a communication network such as the Internet.

[0079] 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 as a command 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, and the vehicle travels.

[0080] The positive electrode side connection portion of the high potential side electrical path 22H and the negative electrode side connection portion of the low potential side electrical path 22L are interfaces for connecting to an external charger. In this embodiment, the external charger is a high voltage charger 200 or a low voltage charger 210 (see Figure 3 ). The charging voltage of the high-voltage charger 200 is a voltage of the same degree as the terminal voltage (specifically, the rated voltage) of the series connection of the first and second batteries 31, 32, for example, 800V. The charging voltage of the low-voltage charger 210 is a voltage lower than the rated voltage of the series connection of the first and second batteries 31, 32, for example, 400V. For example, when a user or an operator connects an external charger to each connection portion and charges the first and second batteries 31, 32 through the external charger, the high-potential side charging switch DCRH and the low-potential side charging switch DCRL are switched on by the control device 100.

[0081] On the other hand, when charging by an external charger is not performed or when an external charger is not connected, the high potential side charging switch DCRH and the low potential side charging switch DCRL are switched off by the control device 100. When the positive electrode side connection part and the negative electrode side connection part are exposed to the outside from the housing of the power conversion device, there is a possibility that the user or operator touches them. The high potential side charging switch DCRH and the low potential side charging switch DCRL are turned off to prevent electric shock.

[0082] Next, use Figure 2 The charging process performed by the external charger will be described. This process is executed by control device 100 .

[0083] In step S10, it is determined whether the external charger connected to each connection portion of each electric path 22H, 22L is the high-voltage charger 200. This process is a process for determining whether the connection state of the first and second batteries 31, 32 is set to the series connection state.

[0084] When it is determined in step S10 that the external charger is the high-voltage charger 200, the process proceeds to step S11, and the inter-battery switch 40, the bypass switch 50, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200.

[0085] Specifically, the inter-battery switch 40 is turned on, and the bypass switch 50, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Figure 3 As shown, the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200. Therefore, the current flows in a closed circuit including the high-voltage 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 while being connected in series. At this time, since the upper arm switch SWH of the inverter 20 and the motor side switch 60 are disconnected, the charging current of the high-voltage charger 200 can be prevented from flowing to the inverter 20 and the armature winding 11. In addition, Figure 3 In the figure, the main switches SMRH, SMRL and the charging switches DCRH, DCRL are omitted.

[0086] return Figure 2 In step S10, if it is determined that the external charger is not the high voltage charger 200, the process proceeds to step S12 to determine whether the connected external charger is the low voltage charger 210. This process is for determining whether the connection state of the first and second batteries 31 and 32 is set to the connection state via the motor.

[0087] If it is determined in step S12 that the external charger is the low voltage charger 210, the process proceeds to step S13, and the inter-battery switch 40, the bypass switch 50, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the connection state of the first and second storage batteries 31 and 32 becomes the state of connection via the motor. In this way, the system voltage is reduced to a voltage equivalent to the charging voltage of the low voltage charger 210, and a ground fault countermeasure can be sought when charging by the low voltage charger 210.

[0088] Specifically, the inter-battery switch 40 is turned off, and the bypass switch 50 and the motor-side switch 60 are turned on. In addition, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. Figure 4As shown, the first battery 31 and the second battery 32 are connected to the low voltage charger 210 via the motor. Therefore, the current flows in a closed circuit including the low voltage charger 210, the high potential side electrical path 22H, the first battery 31, the bypass switch 50, and the low potential side electrical path 22L, and the first battery 31 is charged. In addition, the current flows in a closed circuit including the low voltage charger 210, the high potential side electrical path 22H, the upper arm switch SWH, the armature winding 11, the neutral point, the motor side switch 60, the second battery 32, and the low potential side electrical path 22L, and the second battery 32 is charged. In addition, in step S13, when the upper arm switches SWH of multiple phases are turned on, the impedance of the charging path can be reduced.

[0089] By processing in step S13, the connection state of the first and second batteries 31 and 32 can be set to the connection state via the motor. As a result, the first battery 31 can be directly charged by the low-voltage charger 210, and the second battery 32 can be charged via the inverter 20 and the armature winding 11. In addition, even if the rated voltages of the first and second batteries 31 and 32 are different, or even if the rated voltages are the same but the actual terminal voltages of the first and second batteries 31 and 32 are different, the first and second batteries 31 and 32 can be charged simultaneously without adding a power conversion circuit.

[0090] According to the present embodiment described in detail above, it is possible to realize a structure for reducing the system voltage in accordance with the charging voltage of the low voltage charger 210 by using the configuration of the inverter 20 and a part of the motor 10. Therefore, it is possible to provide a simplified power conversion device that realizes a structure for switching the connection state of the first and second batteries 31 and 32.

[0091] <Modification of the first embodiment>

[0092] ·exist Figure 2 In step S11, the upper arm switch SWH and the motor side switch 60 of at least one phase may be turned on under the condition that the upper and lower arm switches SWH and SWL of the same phase of the inverter 20 are not turned on. In addition, in step S11, a switching operation of repeatedly turning on and off one of the upper and lower arm switches SWH and SWL of the same phase may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL of the same phase may be performed.

[0093] In step S13, the upper arm switch SWH is not limited to being maintained on, and a switching operation of repeatedly turning on and off may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL in at least one phase may be performed. In this case, for example, the switching operation may be performed based on the detected value of the electrical angle so that the torque of the motor 10 becomes 0 or a value close to 0 (specifically, for example, the q-axis current flowing through the armature winding 11 becomes 0 or a value close to 0).

[0094] · After the affirmative determination in step S12, the process of step S13 may be performed when it is determined that the voltage between the terminals of the first battery 31 detected by the first voltage sensor 71 (hereinafter referred to as the first detection voltage VA) is greater than the voltage between the terminals of the second battery 32 detected by the second voltage sensor 72 (hereinafter referred to as the second detection voltage VB). In addition, after the affirmative determination in step S12, the process of step S13 may be performed when it is determined that the second detection voltage VB is higher than the first detection voltage VA and the value obtained by subtracting the first detection voltage VA from the second detection voltage VB is less than the threshold value ΔVjde (>0, equivalent to the second threshold value ΔVjde2 described later). Thus, when the operation state of each switch is switched as in step S13, the current can be suppressed from flowing from the second battery 32 to the first battery 31 via the motor side electric path 25, the armature winding 11, the upper arm diode DH, and the high potential side electric path 22H, or even if this phenomenon occurs, the amount of current flowing can be reduced.

[0095] In addition, the threshold value ΔVjde is a value smaller than the rated voltage of each storage battery 31, 32. The threshold value ΔVjde is set to, for example, a value less than 1 / 10, a value less than 1 / 20, a value less than 1 / 50, or a value less than 1 / 100 of the lower value of the rated voltage of each storage battery 31, 32. The situation where the second detection voltage VB is greatly different from the first detection voltage VA may occur, for example, in the following cases (1) to (3).

[0096] (1) In a configuration where the rated voltages of the battery cells constituting the respective storage batteries 31 and 32 are the same, the number of battery cells constituting the first storage battery 31 is different from the number of battery cells constituting the second storage battery 32 .

[0097] (2) In a configuration where the number of battery cells constituting each of the storage batteries 31 and 32 is the same, but the types of the storage batteries 31 and 32 are different and the rated voltages of the battery cells of the storage batteries 31 and 32 are different.

[0098] (3) When the number of battery cells constituting each of the storage batteries 31 and 32 is different, the types of each of the storage batteries 31 and 32 are different, and the rated voltages of the battery cells of each of the storage batteries 31 and 32 are different.

[0099] <Second embodiment>

[0100] Hereinafter, the second embodiment will be described with reference to the accompanying drawings, centering on the differences from the first embodiment. Figure 5 As shown, the bypass switch 51 connects the positive terminal of the second battery 32 to the high potential side electrical path 22H. In addition, the motor side switch 61 connects the negative terminal of the first battery 31 to the neutral point of the armature winding 11.

[0101] exist Figure 6 2 shows the sequence of the charging control process according to the present embodiment executed by the control device 100 .

[0102] If it is determined in step S10 that the external charger is the high-voltage charger 200, the process proceeds to step S14, the inter-battery switch 40 is turned on, and the bypass switch 51, the motor-side switch 61, and the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off, so that the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200. As a result, the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200, and the first battery 31 and the second battery 32 are charged in the state of being connected in series.

[0103] If it is determined in step S12 that the external charger is the low-voltage charger 210, the process proceeds to step S15, the inter-battery switch 40 is turned off, the bypass switch 51 and the motor-side switch 61 are turned on, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on, so that the connection state of the first battery 31 and the second battery 32 becomes a connection state via the motor with respect to the low-voltage charger 210. As a result, the connection state of the first battery 31 and the second battery 32 becomes a connection state via the motor with respect to the low-voltage charger 210, and the first battery 31 and the second battery 32 are charged.

[0104] <Modification of Second Embodiment>

[0105] ·exist Figure 6In step S14, the lower arm switch SWL of at least one phase and the motor side switch 61 may be turned on under the condition that the upper and lower arm switches SWH and SWL of the same phase of the inverter 20 are not turned on. In addition, in step S14, a switching operation of repeatedly turning on and off one of the upper and lower arm switches SWH and SWL of the same phase may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL of the same phase may be performed.

[0106] In step S15 , the lower arm switch SWL is not limited to being maintained on, and a switching operation of repeatedly turning on and off may be performed, or a switching operation of alternately turning on the upper and lower arm switches SWH, SWL in at least one phase may be performed.

[0107] After an affirmative determination is made in step S12, if it is determined that the second detection voltage VB is greater than the first detection voltage VA, the process of step S15 may be performed. In addition, after an affirmative determination is made in step S12, if it is determined that the first detection voltage VA is higher than the second detection voltage VB and the value obtained by subtracting the second detection voltage VB from the first detection voltage VA is less than the threshold value ΔVjde, the process of step S15 may be performed.

[0108] <Third Embodiment>

[0109] Hereinafter, the third embodiment will be described with reference to the accompanying drawings, centering on the differences from the first embodiment. Figure 7 As shown, a bypass switch 80 is further provided for connecting the positive terminal of the second storage battery 32 to the high potential side electrical path 22H. In the present embodiment, the bypass switch 80 is referred to as a second bypass switch 80 and the bypass switch 50 is referred to as a first bypass switch 50.

[0110] exist Figure 8 2 shows the sequence of the charging control process according to the present embodiment executed by the control device 100 .

[0111] In step S20 , similarly to step S10 , it is determined whether the external charger is high-voltage charger 200 .

[0112] When it is determined in step S20 that the external charger is the high-voltage charger 200, the process proceeds to step S21, and the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200.

[0113] Specifically, the inter-battery switch 40 is turned on, and the first bypass switch 50, the second bypass switch 80, the motor-side switch 60, and the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. As a result, the first battery 31 and the second battery 32 are charged in a state in which they are connected in series with respect to the high-voltage charger 200.

[0114] If it is determined in step S20 that the external charger is not high voltage charger 200 , the process proceeds to step S22 , where it is determined whether the external charger is low voltage charger 210 similarly to step S12 .

[0115] If it is determined in step S22 that the external charger is the low voltage charger 210 , the process proceeds to step S23 to determine whether the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is equal to or less than a first threshold value ΔVjde1 (>0).

[0116] When it is determined in step S23 that the absolute value of the difference is less than the first threshold value ΔVjde1, proceed to step S24, operate the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 60 and the upper and lower arm switches SWH and SWL of the inverter 20, so that the first battery 31 and the second battery 32 are respectively connected in parallel with respect to the low-voltage charger 210.

[0117] Specifically, the inter-battery switch 40 and the motor-side switch 60 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. In addition, the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Fig.10 As shown, the first battery 31 and the second battery 32 are connected in parallel with the low voltage charger 210. Therefore, the current flows in a closed circuit including the low voltage charger 210, the high potential side electrical path 22H, the first battery 31, the first bypass switch 50, and the low potential side electrical path 22L, and the first battery 31 is charged. In addition, the current flows in a closed circuit including the low voltage charger 210, the high potential side electrical path 22H, the second bypass switch 80, the second battery 32, and the low potential side electrical path 22L, and the second battery 32 is charged. At this time, since the potential difference between the first and second batteries 31 and 32 is small, the phenomenon that the current flows from one of the first and second batteries 31 and 32 to the other can be suppressed, or even if the phenomenon occurs, the amount of current flowing in can be reduced.

[0118] return Figure 8In step S23, when it is determined that the absolute value of the difference exceeds the first threshold value ΔVjde1, the process proceeds to step S25 to determine whether the value obtained by subtracting the first detection voltage VA from the second detection voltage VB is less than or equal to the second threshold value ΔVjde2 (>0) which is larger than the first threshold value ΔVjde1. In step S25, when it is determined that "VB-VA>ΔVjde2", the charging of the first and second batteries 31 and 32 by the low voltage charger 210 in the motor connection state and the parallel connection state is prohibited. The situation determined in step S25 as "VB-VA>ΔVjde2" is the situation where the second detection voltage VB is higher than the first detection voltage VA and the potential difference between the second detection voltage VB and the first detection voltage VA exceeds the second threshold value ΔVjde2. In addition, the first threshold value ΔVjde1 is set to the potential difference between the first battery 31 and the second battery 32 such that the maximum value of the inrush current (surge current, impact current) and the steady-state value are below 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, for example, the impedance of the first and second batteries 31 and 32)" and "the potential difference between the first battery 31 and the second battery 32", for example, when the first and second batteries 31 and 32 are connected in parallel. In addition, when the connection state of the first and second batteries 31 and 32 is set to the connection state via the motor, the second threshold value ΔVjde2 is set to the potential difference between the first battery 31 and the second battery 32 so that the maximum value of the inrush current and the steady-state 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, for example, the impedance of the first and second batteries 31 and 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 potential difference between the first battery 31 and the second battery 32". Here, the allowable value refers to, for example, the maximum current that the components on the current path can safely withstand.

[0119] On the other hand, if it is determined in step S25 that "VB-VA≤ΔVjde2", the process proceeds to step S26. The situation in which it is determined in step S25 that "VB-VA≤ΔVjde2" is a situation in which the first detection voltage VA is higher than the second detection voltage VB and the potential difference between the second detection voltage VB and the first detection voltage VA exceeds the first threshold value ΔVjde1, or a situation in which the second detection voltage VB is higher than the first detection voltage VA and the potential difference between the second detection voltage VB and the first detection voltage VA is greater than the first threshold value ΔVjde1 and is less than the second threshold value ΔVjde2. In step S26, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the connection state of the first storage battery 31 and the second storage battery 32 becomes the connection state via the motor.

[0120] Specifically, the inter-battery switch 40 and the second bypass switch 80 are turned off, and the first bypass switch 50 and the motor-side switch 60 are turned on. In addition, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. Fig. 9 As shown, the connection state of the first battery 31 and the second battery 32 becomes a connection state via the motor. Therefore, the current flows in a closed circuit including the low-voltage charger 210, the high-potential side electrical path 22H, the first battery 31, the first bypass switch 50, and the low-potential side electrical path 22L, and the first battery 31 is charged. In addition, the current flows in a closed circuit including the low-voltage charger 210, the high-potential side electrical path 22H, the upper arm switch SWH, the armature winding 11, the neutral point, the motor side switch 60, the second battery 32, and the low-potential side electrical path 22L, and the second battery 32 is charged. At this time, the phenomenon that the 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, and the high-potential side electrical path 22H can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0121] <Modification of the Third Embodiment>

[0122] You can also cancel Figure 8 The processing of step S25 is performed, and if an affirmative determination is made in step S23, the processing of step S26 is performed. In addition, in step S26, it is not limited to maintaining the upper arm switch SWH in conduction, and a switching operation of repeatedly turning on and off may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL may be performed in at least one phase.

[0123] <Fourth embodiment>

[0124] Hereinafter, the fourth embodiment will be described with reference to the accompanying drawings, centering on the differences from the third embodiment. Fig.11 As shown, the motor-side electric path 25 provided with the motor-side switch 61 connects the neutral point of the armature winding 11 to the first battery 31 side of the inter-battery electric path 24 relative to the inter-battery switch 40 .

[0125] exist Fig.12 2 shows the sequence of the charging control process according to the present embodiment executed by the control device 100 .

[0126] When it is determined in step S20 that the external charger is the high-voltage charger 200, the process proceeds to step S26, and the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200.

[0127] Specifically, the inter-battery switch 40 is turned on, and the first bypass switch 50, the second bypass switch 80, the motor-side switch 61, and the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. As a result, the first battery 31 and the second battery 32 are charged in a state where they are connected in series to the high-voltage charger 200.

[0128] If it is determined in step S22 that the external charger is the low voltage charger 210, the process proceeds to step S23. If it is determined in step S23 that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is less than the first threshold value ΔVjde1, the process proceeds to step S27. In step S27, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the first battery 31 and the second battery 32 are connected in parallel with the low voltage charger 210, respectively.

[0129] Specifically, the inter-battery switch 40 and the motor-side switch 61 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. In addition, the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thus, the first and second batteries 31 and 32 are charged in a state where the first and second batteries 31 and 32 are connected in parallel to the low-voltage charger 210. At this time, since the potential difference between the first and second batteries 31 and 32 is small, the phenomenon of current flowing from one of the first and second batteries 31 and 32 to the other can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0130] If a negative determination is made in step S23, the process proceeds to step S28 to determine whether the value obtained by subtracting the second detection voltage VB from the first detection voltage VA is less than the second threshold value ΔVjde2. If it is determined in step S28 that "VA-VB>ΔVjde2", charging of the first and second batteries 31 and 32 by the low voltage charger 210 in the motor connection state and the parallel connection state is prohibited. The situation in which it is determined in step S28 that "VA-VB>ΔVjde2" is a situation in which the first detection voltage VA is higher than the second detection voltage VB and the potential difference between the second detection voltage VB and the first detection voltage VA exceeds the second threshold value ΔVjde2.

[0131] On the other hand, if it is determined that "VA-VB ≤ ΔVjde2" in step S28, the process proceeds to step S29. The situation in which it is determined that "VA-VB ≤ ΔVjde2" in step S28 is a situation in which the second detection voltage VB is higher than the second detection voltage VA and the potential difference between the second detection voltage VB and the first detection voltage VA exceeds the first threshold value ΔVjde1, or a situation in which the first detection voltage VB is higher than the second detection voltage VB and the potential difference between the second detection voltage VB and the first detection voltage VA is greater than the first threshold value ΔVjde1 and is less than the second threshold value ΔVjde2. In step S29, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the connection state of the first storage battery 31 and the second storage battery 32 becomes the connection state via the motor.

[0132] Specifically, the inter-battery switch 40 and the first bypass switch 50 are turned off, and the second bypass switch 80 and the motor-side switch 61 are turned on. In addition, the upper arm switches SWH of all phases of the inverter 20 are turned off, and the lower arm switch SWL of at least one phase is turned on. As a result, the connection state of the first and second batteries 31 and 32 relative to the low-voltage charger 210 becomes a connection state via the motor, and the first and second batteries 31 and 32 are charged. At this time, the phenomenon of current flowing from the first battery 31 to the second battery 32 can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0133] <Modification of the Fourth Embodiment>

[0134] You can also cancel Fig.12The processing of step S28 is performed, and if an affirmative determination is made in step S23, the processing of step S29 is performed. In addition, in step S29, it is not limited to maintaining the lower arm switch SWL in conduction, and a switching action of repeatedly turning on and off can be performed, and a switching action of alternately turning on the upper and lower arm switches SWH and SWL can be performed in at least one phase.

[0135] <Fifth embodiment>

[0136] Hereinafter, the fifth embodiment will be described with reference to the accompanying drawings, centering on the differences from the fourth embodiment. Fig.13 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 is provided.

[0137] 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 second end of the first electric path 27 is connected to the second battery 32 side of the inter-battery electric path 24 relative to the inter-battery switch 40. In addition, the first end of the second electric path 28 is connected to the second end of the common path 26, and the second end of the second electric path 28 is connected to the first battery 31 side of the inter-battery electric path 24 relative to the inter-battery switch 40. In the present embodiment, the common path 26 and the first electric path 27 are equivalent to the "first motor side electric path", and the common path 26 and the second electric path 28 are equivalent to the "second motor side electric path". In addition, the common path 26 may not be provided, and 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.

[0138] A first motor-side switch 60 is provided in the first electric path 27 , and a second motor-side switch 61 is provided in the second electric path 28 .

[0139] exist Fig.14 2 shows the sequence of the charging control process according to the present embodiment executed by the control device 100 .

[0140] If it is determined in step S20 that the external charger is the high-voltage charger 200, the process proceeds to step S30, the inter-battery switch 40 is turned on, and the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are turned off, so that the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200. Thus, the first battery 31 and the second battery 32 are charged in a state where the first battery 31 and the second battery 32 are connected in series with respect to the high-voltage charger 200.

[0141] If it is determined in step S22 that the external charger is the low voltage charger 210, the process proceeds to step S23. If it is determined in step S23 that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is less than the first threshold value ΔVjde1, the process proceeds to step S31. In step S31, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated so that the first battery 31 and the second battery 32 are respectively connected in parallel with respect to the low voltage charger 210.

[0142] Specifically, the inter-battery switch 40, the first motor side switch 60, and the second motor side switch 61 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. In addition, the upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thus, the first and second batteries 31 and 32 are charged in a state where the first and second batteries 31 and 32 are connected in parallel to the low voltage charger 210. At this time, since the potential difference between the first and second batteries 31 and 32 is small, the phenomenon of current flowing from one of the first and second batteries 31 and 32 to the other can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0143] If a negative determination is made in step S23, the process proceeds to step S34 to determine which of the first detection voltage VA and the second detection voltage VB is higher. If it is determined in step S34 that "VA>VB", the process proceeds to step S32 to operate the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 so that the connection state of the first battery 31 and the second battery 32 becomes the first via-motor connection state.

[0144] Specifically, the inter-battery switch 40, the second motor side switch 61, and the second bypass switch 80 are turned off, and the first bypass switch 50 and the first motor side switch 60 are turned on. In addition, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. Thus, the first and second batteries 31 and 32 are charged. At this time, since the potential difference between the first and second batteries 31 and 32 is small, the phenomenon of current flowing from the second battery 32 to the first battery 31 can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0145] On the other hand, when it is determined in step S34 that "VB>VA", proceed to step S33, operate the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61 and the upper and lower arm switches SWH and SWL of the inverter 20, so that the connection state of the first battery 31 and the second battery 32 becomes the second connection state via the motor.

[0146] Specifically, the inter-battery switch 40, the first motor side switch 60, and the first bypass switch 50 are turned off, and the second bypass switch 80 and the second motor side switch 61 are turned on. In addition, the upper arm switches SWH of all phases of the inverter 20 are turned off, and the lower arm switch SWL of at least one phase is turned on. Thus, the first and second batteries 31 and 32 are charged. At this time, since the potential difference between the first and second batteries 31 and 32 is small, the phenomenon of current flowing from the first battery 31 to the second battery 32 can be suppressed, or even if this phenomenon occurs, the amount of current flowing in can be reduced.

[0147] According to the present embodiment described above, regardless of the magnitude relationship between the voltages between the terminals of the first battery 31 and the second battery 32, it is possible to suppress the flow of current from one of the first and second batteries 31 and 32 into the other, or reduce the amount of current flowing in. Fig.14 In step S32, the upper arm switch SWH is not limited to being maintained on, and a switching operation of repeatedly turning on and off may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL in at least one phase may be performed. In addition, in step S33, the lower arm switch SWL is not limited to being maintained on, and a switching operation of repeatedly turning on and off may be performed, and a switching operation of alternately turning on the upper and lower arm switches SWH and SWL in at least one phase may be performed.

[0148] <Sixth embodiment>

[0149] The sixth embodiment will be described below with reference to the drawings, centering on the differences from the first embodiment. In the present embodiment, in the charging process when the low voltage charger 210 is connected, a switching operation is performed to switch the upper arm switch SWH included in the charging path of the second battery 32 on and off. In this case, a high frequency current is generated accompanying the switching operation. In the present embodiment, as shown in FIG. Fig.15 As shown, the power conversion device includes a capacitor 90 that suppresses high-frequency current generated by switching operation from flowing from the inverter 20 side into the second storage battery 32 and the low-voltage charger 210 .

[0150] The portion between the low potential side main switch SMRL and the low potential side charging switch DCRL in the low potential side electrical path 22L (equivalent to the "target path") is connected to the neutral point side of the motor side switch 60 in the motor side electrical path 25 via a series connection of a connecting switch 91 and a capacitor 90. The connecting switch 91 may be a mechanical relay or a semiconductor switching element.

[0151] The control device 100 opens the connection switch 91 during the switching control of the inverter 20 for driving the vehicle. Thus, when the control amount of the electric motor 10 is controlled to be the command value, it is possible to suppress a negative influence on the control.

[0152] On the other hand, the control device 100 is, for example, Figure 2 During the charging process by the low-voltage charger 210 in step S13, the connection switch 91 is turned on. As a result, when a current flows in the motor-side electrical path 25, noise or AC sound included in the current flowing through the motor-side electrical path 25 can flow into the capacitor 90. On the other hand, during the charging process by the high-voltage charger 200 in step S11, for example, the connection switch 91 is turned off. This is because the switching operation of the inverter 20 is not performed during the charging process by the high-voltage charger 200.

[0153] According to the present embodiment described above, during the charging process performed by the low voltage charger 210 , it is possible to suppress the high frequency current generated by the switching operation from the inverter 20 side from flowing into the second battery 32 and the low voltage charger 210 .

[0154] <Modification of Sixth Embodiment>

[0155] The capacitor 90 may be connected to the motor-side electric path 25 side, and the connection switch 91 may be connected to the low-potential-side electric path 22L side.

[0156] The connection switch 91 may not be provided. That is, the motor-side electric path 25 may be always connected to the low-potential-side electric path 22L.

[0157] ·like Fig.16 As shown, the series connection of the connection switch 92 and the capacitor 90 may connect a portion of the motor-side electric path 25 closer to the second battery 32 than the motor-side switch 60 to the low potential-side electric path 22L.

[0158] In addition, Fig.16 In the illustrated configuration, the connection switch 92 may not be provided. That is, the motor-side electric path 25 may be always connected to the low-potential-side electric path 22L.

[0159] ·like Fig.17 As shown, a plurality of capacitors may be provided. Specifically, a connection switch 93 may be provided on the neutral point side of the motor-side switch 60 in the motor-side electrical path 25. A portion between the motor-side switch 60 and the connection switch 93 in the motor-side electrical path 25 is connected to a high-potential-side electrical path 22H (equivalent to the "target path") via a first capacitor 93A, and is connected to a low-potential-side electrical path 22L (equivalent to the "target path") via a second capacitor 93B.

[0160] In addition, Fig.17 In the illustrated configuration, either the first capacitor 93A or the second capacitor 93B may not be provided.

[0161] ·like Fig.18 As shown, a first end of a connection switch 94 may be connected to the neutral point side of the motor-side switch 60 in the motor-side electric path 25 , and a first capacitor 93A and a second capacitor 93B may be connected to a second end of the connection switch 94 .

[0162] <Seventh embodiment>

[0163] Hereinafter, the seventh embodiment will be described with reference to the drawings, centering on the differences from the first embodiment. Fig.19 As shown in FIG. 1 , a series connection body of a precharge switch SP and a resistor 95 is connected in parallel with the motor side switch 60. Fig.19 In the figure, for convenience, illustration of the control device 100 and the like is omitted.

[0164] For example, when the power converter is started, the control device 100 performs a precharge process to charge the smoothing capacitor 21. In the present embodiment, even if either the first storage battery 31 or the second storage battery 32 becomes abnormal and unusable, the precharge process can be performed by the remaining storage battery.

[0165] First, use Fig. 20The following describes a case where an abnormality occurs in the second battery 32. In this case, the control device 100 turns on the high potential side main switch SMRH, the precharge switch SP, and the inter-battery switch 40, and turns off the low potential side main switch SMRL, the motor side switch 60, and the bypass switch 50. In addition, the control device 100 turns off the upper and lower arm switches SWH and SWL of all phases of the inverter 20. As a result, the smoothing capacitor 21 can be charged by the first battery 31.

[0166] Next, use Fig.21 The following describes a case where an abnormality occurs in the first battery 31. In this case, the control device 100 turns on the low potential side main switch SMRL and the precharge switch SP, and turns off the high potential side main switch SMRH, the motor side switch 60, the inter-battery switch 40, and the bypass switch 50. In addition, the control device 100 turns off the upper and lower arm switches SWH and SWL of all phases of the inverter 20. As a result, the smoothing capacitor 21 can be charged by the second battery 32.

[0167] <Eighth Embodiment>

[0168] Hereinafter, the eighth embodiment will be described with reference to the accompanying drawings, centering on the differences from the sixth and seventh embodiments. Fig. 22 As shown, a connection switch 93 and a capacitor 90 are provided. A first end of the capacitor 90 is connected to a portion between a connection point connected to the precharge switch SP in the motor side electrical path 25 and the connection switch 92. A second end of the capacitor 90 is connected to the inverter 20 side compared to the low potential side main switch SMRL in the low potential side electrical path 22L.

[0169] In the pre-charging process for charging the smoothing capacitor 21, the control device 100 can charge the smoothing capacitor 21 and the capacitor 90 at the same time. Fig.23 As shown, the control device 100 turns on the high potential side main switch SMRH, the precharge switch SP, and the inter-battery switch 40, and turns off the low potential side main switch SMRL, the motor side switch 60, and the bypass switch 50. In addition, the control device 100 turns off the upper and lower arm switches SWH and SWL of all phases of the inverter 20.

[0170] <Modification of Eighth Embodiment>

[0171] like Fig.24 As shown, a series connection body of the precharge switch SP and the resistor 95 may be connected in parallel with the low potential side main switch SMRL.

[0172] <Other embodiments>

[0173] In addition, each of the above-mentioned embodiments may be implemented with the following modifications.

[0174] The circuit configuration of the power conversion device according to each of the above-described embodiments can be changed as follows (A) to (J), for example.

[0175] (A) Fig.25 As shown, it is also possible not to have Figure 1 The motor side switch 60 in the structure shown.

[0176] (B) Fig.26 As shown, it is also possible not to have Figure 5 The motor side switch 61 in the structure shown.

[0177] (C) Fig. 27 As shown, it is also possible not to have Figure 7 The motor side switch 60 in the structure shown.

[0178] (D) Fig.28 As shown, it is also possible not to have Fig.11 The motor side switch 61 in the structure shown.

[0179] (E) Fig.29 As shown, it is also possible not to have Fig.13 The first motor side switch 60 in the structure shown in the figure. Fig.14 If a negative determination is made in step S34 , charging by low-voltage charger 210 in the motor-connected state may be prohibited.

[0180] (F) Fig.30 As shown, it is also possible not to have Fig.13 The second motor side switch 61 in the structure shown in the figure. Fig.14 If an affirmative determination is made in step S34, charging by low-voltage charger 210 in the motor-connected state may be prohibited.

[0181] (G) Fig.31 As shown, it is also possible not to have Fig.13 The first motor side switch 60 and the second bypass switch 80 in the shown configuration.

[0182] (H) Fig.32 As shown, it is also possible not to have Fig.13 The second bypass switch 80 in the configuration shown.

[0183] (I) If Fig.33 As shown, it is also possible not to have Fig.13 The second motor side switch 61 and the first bypass switch 50 in the shown configuration.

[0184] (J) Fig.34 As shown, it is also possible not to have Fig.13 The first bypass switch 50 is shown in the configuration.

[0185] ·like Fig.35 As shown, the positive terminal of the first storage battery 31 and the high potential side electric path 22H may be connected through the first fuse 110A. In addition, the negative terminal of the second storage battery 32 and the low potential side electric path 22L may be connected through the second fuse 110B.

[0186] ·like Fig.36 As shown, a third current sensor 75 is provided in a portion between a connection point connected to the first battery 31 and a high potential side charging switch DCRH in the high potential side electrical path 22H. In addition, a fourth current sensor 76 can be provided at any position in the motor side electrical path 25. For example, a fourth current sensor 76 can be provided in the motor side electrical path 25 on the neutral point side relative to the motor side switch 60. Here, at least two current sensors among the first to fourth current sensors 73 to 76 may be provided. Thus, the charging control of each battery 31, 32 can be performed by as few current sensors as possible. In addition, a current sensor for detecting the current flowing in each conductive member 23 may be provided, and the total value of the current detection value flowing through each conductive member 23 may be used instead of the detection value of the fourth current sensor.

[0187] The connection destination of the motor-side electric path 25 is not limited to the neutral point of the armature winding 11. Fig.37 As shown, it may also be the middle part of the armature winding 11 .

[0188] In addition, for example Fig.38 As shown in FIG. 1 , the connection destination of the motor side electric path 25 may also be the conductive member 23. In this case, in the charging process performed by the low voltage charger 210, as shown in FIG. Fig.39 As shown, the upper arm switch SWH in the phase other than the phase in which the motor side electric path 25 in each phase is connected to the conductive member 23 is turned on, and the lower arm switch SWL is turned off.

[0189] ·like Fig.40 As shown, a high potential side charging switch DCRH and a positive side connecting portion may be provided on the side of the high potential side electrical path 22H opposite to the inverter 20 and the first battery 31, and a low potential side charging switch DCRL and a negative side connecting portion may be provided on the side of the low potential side electrical path 22L opposite to the inverter 20 and the second battery 32.

[0190] ·like Fig.41 As shown, one end of the capacitor 90 may be connected to the second battery 32 side of the motor-side switch 60 in the motor-side electric path 25. In this case, a connection switch is not required.

[0191] Each main switch SMRH, SMRL, each charging switch DCRH, DCRL, inter-battery switch 40, bypass switch, motor-side switch, and connecting switch is not limited to being composed of a single switch, but may be composed of a series connection of multiple switches or a parallel connection of multiple switches.

[0192] The switch of the inverter 20 is not limited to the IGBT, and may be, for example, an N-channel MOSFET having a body diode. In this case, the high potential side terminal of the N-channel MOSFET serves as a drain, and the low potential side terminal serves as a source.

[0193] · As a motor, it is not limited to star connection, and it can also be Δ connection. In addition, as a motor and an inverter, it is not limited to three-phase, and it can also be two-phase or four-phase or more. In addition, as a motor, it is not limited to a permanent magnet synchronous motor having a permanent magnet as a magnetic field pole on the rotor, and it can also be a winding excitation synchronous motor having an excitation winding as a magnetic field pole on the rotor. In this case, it is also possible to have both an excitation winding and a permanent magnet on the rotor. In addition, as a motor, it is not limited to a synchronous motor, and it can also be an induction motor.

[0194] The power storage unit to be charged by the external charger is not limited to a battery, and may be, for example, a large-capacity electric double layer capacitor, or may include both a battery and an electric double layer capacitor.

[0195] The mobile object on which the power conversion device is mounted is not limited to a vehicle, and may be, for example, an aircraft or a ship. In addition, the mounting destination of the power conversion device is not limited to a mobile object, and may be a stationary device.

[0196] ·The control unit and method described in the present disclosure may also be implemented using a dedicated computer provided by constituting the following processor and memory, wherein the processor is programmed to execute one or more functions embodied by a computer program. Alternatively, the control unit and method described in the present disclosure may also be implemented using a dedicated computer provided by constituting a processor composed of one or more dedicated hardware logic circuits. Alternatively, the control unit and method described in the present disclosure may also be implemented by one or more dedicated computers composed of the following combination, wherein the combination is a combination of a processor and memory programmed to execute one or more functions, and a processor composed of 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.

[0197] · Hereinafter, characteristic configurations extracted from the above-mentioned embodiments will be described.

[0198] [Composition 1]

[0199] A power conversion device, comprising:

[0200] A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a first power storage unit (31);

[0201] A low potential side electrical path (22L) capable of being electrically connected to a negative terminal of a second power storage unit (32);

[0202] An inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; and

[0203] The motor (10) has 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).

[0204] In a power conversion device, there is provided:

[0205] an inter-storage unit switch (40) 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;

[0206] 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; and

[0207] The electric motor side electrical path (25-28) electrically connects the armature winding or the conductive member to the electrical path between the power storage units.

[0208] [Composition 2]

[0209] In the power conversion device according to configuration 1, the bypass switch (50) is a switch that electrically connects the negative terminal of the first power storage unit to the negative terminal of the second power storage unit.

[0210] The motor-side electrical path (25) is a path that electrically connects the armature winding and the electrical path between the electrical storage units, which is closer to the second electrical storage unit than the switch between the electrical storage units.

[0211] The power conversion device includes a motor-side switch (60) provided in the motor-side electrical path.

[0212] [Composition 3]

[0213] The power conversion device described in configuration 2 includes a control unit (100) for determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter.

[0214] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, the control unit turns on the switch between power storage units and turns off the bypass switch.

[0215] The control unit turns off the switch between power storage units and turns on the bypass switch and the motor-side switch on condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state.

[0216] [Composition 4]

[0217] In the power conversion device described in configuration 2, the bypass switch is a first bypass switch (50),

[0218] The power conversion device includes a second bypass switch (80) for electrically connecting the positive terminal of the first power storage unit and the positive terminal of the second power storage unit.

[0219] [Composition 5]

[0220] The power conversion device described in configuration 4 includes a control unit (100) for determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter.

[0221] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch.

[0222] The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state.

[0223] The control unit performs a second operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor,

[0224] The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch.

[0225] The second operation is an operation of turning off the switch between the power storage units and the second bypass switch, turning on the first bypass switch and the motor-side switch, and performing a switching operation of the inverter.

[0226] The switching operation of the inverter is an operation of turning off the lower arm switches of each phase and turning on the upper arm switch of at least one phase, or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper and lower arm switches of the same phase are not turned on at the same time.

[0227] [Composition 6]

[0228] In the power conversion device described in configuration 5, the control unit performs the first operation when it is determined that the connection state of the first power storage unit and the second power storage unit is set to the parallel connection state and when it is determined that the potential difference between the first power storage unit and the second power storage unit is less than a first threshold value (ΔVjde1),

[0229] The control unit performs the second operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that a value obtained by subtracting the voltage of the first power storage unit from the voltage of the second power storage unit is less than a second threshold value (ΔVjde2) larger than the first threshold value.

[0230] [Composition 7]

[0231] In the power conversion device according to configuration 1, the bypass switch (51) is a switch that electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit.

[0232] The motor-side electrical path (25) is a path that electrically connects the armature winding and the electrical path between the electrical storage units, which is closer to the first electrical storage unit than the switch between the electrical storage units.

[0233] The power conversion device includes a motor-side switch (61) provided in the motor-side electrical path.

[0234] [Composition 8]

[0235] The power conversion device according to configuration 7 includes a control unit (100) for determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding and the inverter.

[0236] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, the control unit turns on the switch between power storage units and turns off the bypass switch.

[0237] The control unit turns off the switch between power storage units and turns on the bypass switch and the motor-side switch on condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state.

[0238] [Composition 9]

[0239] The power conversion device according to configuration 1 includes:

[0240] a first bypass switch (50) electrically connecting the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; and

[0241] A second bypass switch (80) electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit.

[0242] The motor-side electrical path (25) is a path that electrically connects the armature winding and the electrical path between the electrical storage units, which is closer to the first electrical storage unit than the switch between the electrical storage units.

[0243] The power conversion device includes a motor-side switch (61) provided in the motor-side electrical path.

[0244] [Composition 10]

[0245] In the power conversion device described in configuration 9, there is provided a control unit (100) which determines whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter.

[0246] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch.

[0247] The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state.

[0248] The control unit performs a second operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor,

[0249] The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch.

[0250] The second operation is an operation of turning off the switch between the power storage units and the first bypass switch and turning on the second bypass switch and the motor-side switch, and is an operation of performing a switching operation of the inverter.

[0251] The switching operation of the inverter is an operation of turning off the upper arm switches of each phase and turning on the lower arm switch of at least one phase, or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper and lower arm switches of the same phase are not turned on at the same time.

[0252] [Composition 11]

[0253] In the power conversion device described in configuration 10,

[0254] The control unit performs the first operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that the potential difference between the first power storage unit and the second power storage unit is less than or equal to a first threshold value (ΔVjde1),

[0255] The control unit performs the second operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that a value obtained by subtracting the voltage of the second power storage unit from the voltage of the first power storage unit is less than a second threshold value (ΔVjde2) larger than the first threshold value.

[0256] [Composition 12]

[0257] In the power conversion device described in Configuration 1, the bypass switch includes:

[0258] a first bypass switch (50) electrically connecting the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; and

[0259] A second bypass switch (80) electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit.

[0260] The electric motor side electrical path includes:

[0261] a first motor side electrical path (26, 27) electrically connecting the armature winding and the electrical path between the electrical storage units, closer to the second electrical storage unit than the switch between the electrical storage units; and

[0262] A second motor side electrical path (26, 28) electrically connects the armature winding and the portion of the electrical path between the power storage units that is closer to the first power storage unit than the switch between the power storage units.

[0263] The power conversion device includes a first motor side switch (60) provided on the first motor side electrical path, and a second motor side switch (61) provided on the second motor side electrical path.

[0264] [Composition 13]

[0265] In the power conversion device described in configuration 12, there is provided a control unit (100) which determines whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter, or a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter.

[0266] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch.

[0267] The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state.

[0268] When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the connection state via the motor, the control unit performs a second operation or a third operation,

[0269] The first operation is an operation of turning off at least one of the first motor side switch and the second motor side switch and the switch between power storage units, and turning on the first bypass switch and the second bypass switch.

[0270] The second operation is an operation of turning off the switch between the power storage units, the second bypass switch, and the second motor side switch, turning on the first bypass switch and the first motor side switch, and performing a first switching operation of the inverter.

[0271] The third operation is an operation of turning off the switch between the power storage units, the first bypass switch, and the first motor side switch, and turning on the second bypass switch and the second motor side switch, and performing a second switching operation of the inverter.

[0272] The first switching operation of the inverter is an operation of turning off the lower arm switches of each phase and turning on the upper arm switch of at least one phase, or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

[0273] The second switching operation of the inverter is an operation of disconnecting the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

[0274] [Composition 14]

[0275] In the power conversion device described in configuration 13,

[0276] The control unit performs the first operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that the potential difference between the first power storage unit and the second power storage unit is less than or equal to a first threshold value (ΔVjde1),

[0277] The control unit performs the second operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that the voltage of the first power storage unit is higher than the voltage of the second power storage unit.

[0278] The control unit performs the third operation when it is determined that the connection state between the first power storage unit and the second power storage unit is set to the connection state via the motor and when it is determined that the voltage of the second power storage unit is higher than the voltage of the first power storage unit.

[0279] [Composition 15]

[0280] In the power conversion device described in any one of configurations 3, 5, 6, 8, 10, and 11,

[0281] The positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,

[0282] The negative terminal of the charger can be electrically connected to the low potential side electrical path,

[0283] The control unit determines to set the connection state of the first power storage unit and the second power storage unit to a series connection state when the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200),

[0284] The control unit determines to set the connection state between the first power storage unit and the second power storage unit to the connection state via the motor, under the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger.

[0285] [Composition 16]

[0286] In the power conversion device described in configuration 13 or 14,

[0287] The positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,

[0288] The negative terminal of the charger can be electrically connected to the low potential side electrical path,

[0289] The control unit determines to set the connection state of the first power storage unit and the second power storage unit to a series connection state when the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200),

[0290] The control unit determines whether to set the connection state between the first power storage unit and the second power storage unit to the first connection state via a motor or the second connection state via a motor, based on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger.

[0291] [Composition 17]

[0292] In the power conversion device described in any one of structures 1 to 16, a capacitor (90, 93A, 93B) is provided, which electrically connects the target path with the motor side electrical path, and the target path is at least one of the high potential side electrical path and the low potential side electrical path.

[0293] [Composition 18]

[0294] In the power conversion device described in configuration 17, there is a connection switch (91~94), by which the connection switch is turned on, the object path and the motor side electrical path are electrically connected via the capacitor, and by which the connection switch is turned off, the electrical connection between the object path and at least one of the motor side electrical path and the capacitor is disconnected.

[0295] [Composition 19]

[0296] In the power conversion device according to the eighteenth configuration, when it is determined that the current is to flow through the motor-side electric path, the connection switch is turned on.

[0297] [Composition 20]

[0298] In the power conversion device described in any one of configurations 1 to 19, comprising:

[0299] a smoothing capacitor (21) electrically connecting the high potential side electrical path and the low potential side electrical path and smoothing the input voltage of the inverter; and

[0300] A series connection of a switch (SP) and a resistor (95),

[0301] The capacitor electrically connects a portion of the motor-side electrical path that is closer to the armature winding than the motor-side switch (60) to the target path.

[0302] The series connection body is connected in parallel with the motor-side switch.

[0303] [Composition 21]

[0304] In the power conversion device described in any one of configurations 1 to 19, comprising:

[0305] a smoothing capacitor (21) electrically connecting the high potential side electrical path and the low potential side electrical path and smoothing the input voltage of the inverter; and

[0306] A series connection of a switch (SP) and a resistor (95),

[0307] The series connection body is connected in parallel to a motor-side switch (60) provided in the motor-side electrical path.

[0308] The present disclosure is described based on the embodiments, but it should be understood that the present disclosure is not limited to the embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations, implementation methods, and other combinations and implementation methods including only one element, the above elements, or the following elements also fall within the scope and thought of the present disclosure.

Claims

1. A power conversion device comprising: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; and The electric motor (10) has an armature winding (11) which is 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 is characterized in that: have: an inter-storage unit switch (40) 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; and The electric motor side electrical path (25-28) electrically connects the armature winding or the conductive member to the electrical path between the power storage units.

2. The power conversion device according to claim 1, characterized in that: The bypass switch (50) is a switch that electrically connects the negative terminal of the first power storage unit to the negative terminal of the second power storage unit. The motor-side electrical path (25) is a path that electrically connects the armature winding to the second power storage unit side of the inter-power storage unit switch in the inter-power storage unit electrical path. The power conversion device includes a motor-side switch (60) provided in the motor-side electrical path.

3. The power conversion device according to claim 2, characterized in that: A control unit (100) is provided, which determines whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding and the inverter, When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, the control unit turns on the switch between power storage units and turns off the bypass switch. The control unit turns off the switch between power storage units and turns on the bypass switch and the motor-side switch on condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state.

4. The power conversion device according to claim 2, characterized in that: The bypass switch is a first bypass switch (50), The power conversion device includes a second bypass switch (80) for electrically connecting the positive terminal of the first power storage unit and the positive terminal of the second power storage unit.

5. The power conversion device according to claim 4, characterized in that: A control unit (100) is provided, the control unit determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter, When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch. The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state. The control unit performs a second operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor, The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units and the second bypass switch, turning on the first bypass switch and the motor-side switch, and performing a switching operation of the inverter. The switching operation of the inverter is an operation of disconnecting the lower arm switch of each phase and turning on the upper arm switch of at least one phase; or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

6. The power conversion device according to claim 5, characterized in that: When the potential difference between the first power storage unit and the second power storage unit is equal to or smaller than a first threshold value (ΔVjde1), the control unit determines to set the connection state between the first power storage unit and the second power storage unit to the parallel connection state. When the potential difference between the first power storage unit and the second power storage unit is greater than the first threshold value, and the value obtained by subtracting the voltage of the first power storage unit from the voltage of the second power storage unit is below a second threshold value (ΔVjde2) greater than the first threshold value, the control unit determines to set the connection state between the first power storage unit and the second power storage unit to the connection state via the motor.

7. The power conversion device according to claim 1, characterized in that: The bypass switch (51) is a switch that electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit. The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit switch in the inter-power storage unit electrical path. The power conversion device includes a motor-side switch (61) provided in the motor-side electrical path.

8. The power conversion device according to claim 7, characterized in that: A control unit (100) is provided, which determines whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding and the inverter, When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, the control unit turns on the switch between power storage units and turns off the bypass switch. The control unit turns off the switch between power storage units and turns on the bypass switch and the motor-side switch on condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state.

9. The power conversion device according to claim 1, wherein: A first bypass switch (50) and a second bypass switch (80) are provided as the bypass switches, The first bypass switch electrically connects the negative terminal of the first power storage unit to the negative terminal of the second power storage unit. The second bypass switch electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit. The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit switch in the inter-power storage unit electrical path. The power conversion device includes a motor-side switch (61) provided in the motor-side electrical path.

10. The power conversion device according to claim 9, characterized in that: A control unit (100) is provided, the control unit determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter, When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch. The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state. The control unit performs a second operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor, The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units and the first bypass switch and turning on the second bypass switch and the motor-side switch, and performing a switching operation of the inverter. The switching operation of the inverter is an operation of disconnecting the upper arm switch of each phase and turning on the lower arm switch of at least one phase; or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

11. The power conversion device according to claim 10, characterized in that: When the potential difference between the first power storage unit and the second power storage unit is equal to or smaller than a first threshold value (ΔVjde1), the control unit determines to set the connection state between the first power storage unit and the second power storage unit to the parallel connection state. When the potential difference between the first power storage unit and the second power storage unit is greater than the first threshold value, and the value obtained by subtracting the voltage of the second power storage unit from the voltage of the first power storage unit is below a second threshold value (ΔVjde2) greater than the first threshold value, the control unit determines to set the connection state between the first power storage unit and the second power storage unit to the connection state via the motor and perform the second operation.

12. The power conversion device according to claim 1, wherein: A first bypass switch (50) and a second bypass switch (80) are provided as the bypass switches, The first bypass switch electrically connects the negative terminal of the first power storage unit to the negative terminal of the second power storage unit. The second bypass switch electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit. The power conversion device includes a first motor side electrical path (26, 27) and a second motor side electrical path (26, 28) as the motor side electrical path. The first motor side electrical path electrically connects the armature winding to the second power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch. The second motor side electrical path electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch. The power conversion device includes a first motor side switch (60) provided on the first motor side electrical path, and a second motor side switch (61) provided on the second motor side electrical path.

13. The power conversion device according to claim 12, characterized in that: A control unit (100) is provided, which determines whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, a first connection state via a motor, and a second connection state via a motor, wherein the first connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding and the inverter; and the second connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding and the inverter. When the control unit determines that the connection state between the first power storage unit and the second power storage unit is to be set to the series connection state, the control unit turns on the switch between the power storage units and turns off the first bypass switch and the second bypass switch. The control unit performs a first operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state. The control unit performs a second operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the first via-the-motor connection state, The control unit performs a third operation when determining that the connection state between the first power storage unit and the second power storage unit is to be set to the second motor-connected state. The first operation is an operation of turning off at least one of the first motor side switch and the second motor side switch and the switch between power storage units, and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units, the second bypass switch, and the second motor side switch, turning on the first bypass switch and the first motor side switch, and performing a first switching operation of the inverter. The third operation is an operation of turning off the switch between the power storage units, the first bypass switch, and the first motor side switch, and turning on the second bypass switch and the second motor side switch, and performing a second switching operation of the inverter. The first switching operation of the inverter is an operation of turning off the lower arm switches of each phase and turning on the upper arm switch of at least one phase; or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time. The second switching operation of the inverter is an operation of disconnecting the upper arm switch of each phase and turning on the lower arm switch of at least one phase; or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

14. The power conversion device according to claim 13, characterized in that: When the potential difference between the first power storage unit and the second power storage unit is equal to or smaller than a first threshold value (ΔVjde1), the control unit determines to set the connection state between the first power storage unit and the second power storage unit to the parallel connection state. When the potential difference between the first power storage unit and the second power storage unit is larger than the first threshold value and the voltage of the first power storage unit is higher than the voltage of the second power storage unit, the control unit determines to set the connection state of the first power storage unit and the second power storage unit to the first via-motor connection state, The control unit determines to set the connection state between the first power storage unit and the second power storage unit to the second via-motor connection state when the potential difference between the first power storage unit and the second power storage unit is larger than the first threshold value and the voltage of the second power storage unit is higher than the voltage of the first power storage unit.

15. The power conversion device according to any one of claims 3, 5, 6, 8, 10 and 11, characterized in that: The positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path, The negative terminal of the charger can be electrically connected to the low potential side electrical path, When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the control unit determines to set the connection state of the first power storage unit and the second power storage unit to a series connection state, The control unit determines to set the connection state between the first power storage unit and the second power storage unit to the connection state via the motor, under the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger.

16. The power conversion device according to claim 13 or 14, characterized in that: The positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path, The negative terminal of the charger can be electrically connected to the low potential side electrical path, When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the control unit determines to set the connection state of the first power storage unit and the second power storage unit to a series connection state, The control unit determines whether to set the connection state between the first power storage unit and the second power storage unit to the first connection state via a motor or the second connection state via a motor, based on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger.

17. The power conversion device according to any one of claims 1 to 14, characterized in that: A capacitor (90, 93A, 93B) is provided, which electrically connects a target path with the motor-side electrical path, and the target path is at least one of the high-potential-side electrical path and the low-potential-side electrical path.

18. The power conversion device according to claim 17, characterized in that: A connection switch (91-94) is provided, and when the connection switch is turned on, the object path and the motor-side electrical path are electrically connected through the capacitor, and when the connection switch is turned off, the electrical connection between the object path and at least one of the motor-side electrical path and the capacitor is disconnected.

19. The power conversion device according to claim 18, characterized in that: When it is determined that the current is to flow through the motor-side electric path, the connection switch is turned on.

20. The power conversion device according to claim 17, characterized in that: have: a smoothing capacitor (21) electrically connecting the high potential side electrical path and the low potential side electrical path and smoothing the input voltage of the inverter; and A series connection of a switch (SP) and a resistor (95), The capacitor electrically connects a portion of the motor-side electrical path that is closer to the armature winding than the motor-side switch (60) to the target path. The series connection body is connected in parallel with the motor-side switch.

21. The power conversion device according to any one of claims 1 to 14, characterized in that: have: a smoothing capacitor (21) electrically connecting the high potential side electrical path and the low potential side electrical path and smoothing the input voltage of the inverter; and A series connection of a switch (SP) and a resistor (95), The series connection body is connected in parallel to a motor-side switch (60) provided in the motor-side electrical path.

22. A program, applied to a power conversion device, The power conversion device comprises: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; The electric motor (10) has an armature winding (11) which is electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The program is characterized in that The power conversion device comprises: an inter-storage unit switch (40) 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) electrically connects the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; a motor-side electrical path (25) electrically connecting the armature winding to the second power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch; and A motor side switch (60) is provided in the motor side electrical path. The program causes the computer to execute the following processing: determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, turning on the switch between power storage units and turning off the bypass switch; and On condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state, the switch between power storage units is turned off and the bypass switch and the motor-side switch are turned on.

23. A program, applied to a power conversion device, The power conversion device comprises: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; The electric motor (10) has an armature winding (11) which is electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The program is characterized in that The power conversion device comprises: an inter-storage unit switch (40) 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 first bypass switch (50) electrically connecting the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; a second bypass switch (80) electrically connecting the positive terminal of the first power storage unit to the positive terminal of the second power storage unit; a motor-side electrical path (25) electrically connecting the armature winding to the second power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch; and A motor side switch (60) is provided in the motor side electrical path. The program causes the computer to execute the following processing: determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter; When it is determined that the connection state between the first power storage unit and the second power storage unit is set to the series connection state, turning on the switch between the power storage units and turning off the first bypass switch and the second bypass switch; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state, performing a first operation; as well as When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor, a second operation is performed, The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units and the second bypass switch, turning on the first bypass switch and the motor-side switch, and performing a switching operation of the inverter. The switching operation of the inverter is an operation of disconnecting the lower arm switch of each phase and turning on the upper arm switch of at least one phase; or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

24. A program, applied to a power conversion device, The power conversion device comprises: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; The electric motor (10) has an armature winding (11) which is electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The program is characterized in that The power conversion device comprises: an inter-storage unit switch (40) 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 (51) electrically connects the positive terminal of the first power storage unit to the positive terminal of the second power storage unit; a motor-side electrical path (25) electrically connecting the armature winding to the first power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch; and A motor side switch (61) is provided in the motor side electrical path. The program causes the computer to execute the following processing: determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be the series connection state, turning on the switch between power storage units and turning off the bypass switch; and On condition that it is determined that the connection state between the first power storage unit and the second power storage unit is set to the through-motor connection state, the switch between power storage units is turned off and the bypass switch and the motor-side switch are turned on.

25. A program for use in a power conversion device, The power conversion device comprises: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; The electric motor (10) has an armature winding (11) which is electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The program is characterized in that The power conversion device comprises: an inter-storage unit switch (40) 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 first bypass switch (50) electrically connecting the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; a second bypass switch (80) electrically connecting the positive terminal of the first power storage unit to the positive terminal of the second power storage unit; a motor-side electrical path (25) electrically connecting the armature winding to the first power storage unit side of the inter-power storage unit electrical path relative to the inter-power storage unit switch; and A motor side switch (61) is provided in the motor side electrical path. The program causes the computer to execute the following processing: determining whether the connection state between the first power storage unit and the second power storage unit is set to be a series connection state, a parallel connection state, or a connection state via a motor, wherein the connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter; When it is determined that the connection state between the first power storage unit and the second power storage unit is set to the series connection state, turning on the switch between the power storage units and turning off the first bypass switch and the second bypass switch; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state, performing a first operation; as well as When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the state of connection via the motor, a second operation is performed, The first operation is an operation of turning off the switch between the power storage units and the switch on the motor side and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units and the first bypass switch and turning on the second bypass switch and the motor-side switch, and performing a switching operation of the inverter. The switching operation of the inverter is an operation of disconnecting the upper arm switch of each phase and turning on the lower arm switch of at least one phase; or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

26. A program, applied to a power conversion device, The power conversion device comprises: A high potential side electrical path (22H) capable of being electrically connected to a positive terminal of a 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) having an upper arm switch (SWH) electrically connected to the high potential side electrical path and a lower arm switch (SWL) electrically connected to the low potential side electrical path; The electric motor (10) has an armature winding (11) which is electrically connected to a connection point between the upper arm switch and the lower arm switch via a conductive member (23); and Computer (101), The program is characterized in that The power conversion device comprises: an inter-storage unit switch (40) 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 first bypass switch (50) electrically connecting the negative terminal of the first power storage unit to the negative terminal of the second power storage unit; a second bypass switch (80) electrically connecting the positive terminal of the first power storage unit to the positive terminal of the second power storage unit; a first motor side electrical path (26, 27) electrically connecting the armature winding to the second power storage unit side of the inter-power storage unit electrical path and the inter-power storage unit switch; a second electric motor side electrical path (26, 28) electrically connecting the armature winding to the first power storage unit side of the electrical path between power storage units and the switch between power storage units; a first motor side switch (60) disposed in the first motor side electrical path; and A second motor side switch (61) is provided in the second motor side electrical path, The program causes the computer to execute the following processing: Determining whether the connection state between the first power storage unit and the second power storage unit is set to a series connection state, a parallel connection state, a first connection state via a motor, and a second connection state via a motor, wherein the first connection state via a motor is a state in which the positive terminal of the second power storage unit is connected to the high potential side electrical path via the motor side electrical path, the armature winding, and the inverter, and the second connection state via a motor is a state in which the negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter; When it is determined that the connection state between the first power storage unit and the second power storage unit is set to the series connection state, turning on the switch between the power storage units and turning off the first bypass switch and the second bypass switch; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the parallel connection state, performing a first operation; When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the first connection state via the motor, performing a second operation; as well as When it is determined that the connection state between the first power storage unit and the second power storage unit is to be set to the second motor-connected state, a third operation is performed, The first operation is an operation of turning off at least one of the first motor side switch and the second motor side switch and the switch between power storage units, and turning on the first bypass switch and the second bypass switch. The second operation is an operation of turning off the switch between the power storage units, the second bypass switch, and the second motor side switch, turning on the first bypass switch and the first motor side switch, and performing a first switching operation of the inverter. The third operation is an operation of turning off the switch between the power storage units, the first bypass switch, and the first motor side switch, and turning on the second bypass switch and the second motor side switch, and performing a second switching operation of the inverter. The first switching operation of the inverter is an operation of turning off the lower arm switches of each phase and turning on the upper arm switch of at least one phase; or an operation of repeatedly turning on and off the upper arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time. The second switching operation of the inverter is an operation of disconnecting the upper arm switch of each phase and turning on the lower arm switch of at least one phase; or an operation of repeatedly turning on and off the lower arm switch of at least one phase on the condition that the upper arm switch and the lower arm switch of the same phase are not turned on at the same time.

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