Power conversion device and program

Abstract

To provide a power conversion device and program that can reduce the pulsation of a current flowing through a power storage unit.SOLUTION: The power conversion device includes a motor 10, an inverter 20, a battery inter-switch 50, a bypass switch 60, a connection path 73, and a motor ECU 100. The motor ECU 100 performs switching control of a target switch, which is at least one of upper and lower arm switches SUH to SWL of the inverter 20 to make a current to flow through the connection path 73. When the motor ECU 100 performs switching control of two or more phase target switches, it performs phase shift processing to shift the switching timing of each of the two or more phase target switches to an on state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power conversion device and a program. [Background technology]

[0002] Conventionally, there is known a power conversion device including a motor and an inverter electrically connecting the motor and a power storage unit. The inverter has upper and lower arm switches of multiple phases. The armature winding is electrically connected to a low potential side terminal of the upper arm switch of each phase and a high potential side terminal of the lower arm switch of each phase. Note that a technology related to such a power conversion device is described in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-47677 A Summary of the Invention [Problem to be solved by the invention]

[0004] When at least one of the upper and lower arm switches is switched, pulsation may occur in the current flowing through the power storage unit. In this case, voltage fluctuations may occur in the power storage unit, and the voltage of the power storage unit may exceed the upper limit voltage of the power storage unit. As a result, the reliability of the power storage unit may decrease.

[0005] A primary object of the present disclosure is to provide a power conversion device and a program capable of reducing pulsation of a current flowing through a power storage unit. [Means for solving the problem]

[0006] The present disclosure provides an inverter having upper and lower arm switches for multiple phases; a motor having an armature winding electrically connected to a low potential side terminal of the upper arm switch of each phase and a high potential side terminal of the lower arm switch of each phase; In a power conversion device comprising: a high potential side path electrically connecting a positive electrode terminal of the first power storage unit and a high potential side terminal of the upper arm switch; a low potential side path electrically connecting a negative electrode terminal of the second power storage unit and a low potential side terminal of the lower arm switch; an inter-power storage unit switch that, when turned on, electrically connects the negative electrode terminal of the first power storage unit and the positive electrode terminal of the second power storage unit and, when turned off, electrically disconnects the negative electrode terminal of the first power storage unit and the positive electrode terminal of the second power storage unit; a bypass switch that electrically connects negative electrode terminals of the first power storage unit and the second power storage unit to each other and electrically connects positive electrode terminals of the first power storage unit and the second power storage unit to each other; a connection path electrically connecting the negative terminal of the first power storage unit or the positive terminal of the second power storage unit to the armature winding; A control device that controls switching of a target switch, which is at least one of the upper and lower arm switches, so as to pass a current through the connection path; Equipped with When performing switching control of the target switches of two or more phases, the control device performs a phase shift process of shifting the timing of switching on each of the target switches of two or more phases.

[0007] The power conversion device of the present disclosure includes a high-potential side path, a low-potential side path, an inter-storage unit switch, a bypass switch, and a connection path. With this configuration, a control device executes switching control of a target switch, which is at least one of the upper and lower arm switches, so that a current flows through the connection path.

[0008] By executing the switching control, a current flows through the connection path and also through at least one of the first and second power storage units. In this case, pulsation may occur in the current flowing through the power storage units.

[0009] Here, when performing switching control of target switches of two or more phases, the control device staggers the timings at which the target switches of two or more phases are turned on, thereby reducing pulsation of the current flowing through the connection path and the power storage unit. [Brief description of the drawings]

[0010] [Figure 1] 1 is an overall configuration diagram of a system according to a first embodiment. [Diagram 2] FIG. 4 is a diagram showing the control state of the switches during high voltage charging. [Diagram 3] FIG. 4 is a diagram showing the control state of the switches during low-voltage charging. [Figure 4] 4 is a flowchart showing a procedure of an external charging control process. [Diagram 5] 4 is a time chart showing an external charging control mode with three-phase current flow. [Figure 6] 4 is a time chart showing an external charging control mode with two-phase energization. [Figure 7] 6 is a time chart showing an external charging control mode of three-phase energization according to a modified example of the first embodiment. [Figure 8] FIG. 11 is a diagram showing a control state of a switch during high voltage power supply according to the second embodiment. [Figure 9] FIG. 4 is a diagram showing the control state of the switch during low voltage power supply. [Figure 10] FIG. 13 is a diagram showing a control state of a switch during equalization control according to the third embodiment. [Figure 11] FIG. 13 is an overall configuration diagram of a system according to a fourth embodiment. [Figure 12] FIG. 4 is a diagram showing the control state of the switches during low-voltage charging. [Figure 13] FIG. 4 is a diagram showing the control state of the switch during low voltage power supply. [Figure 14] FIG. 4 is a diagram showing a control state of a switch during equalization control. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Several embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding and / or associated parts may be given the same reference numerals or reference numerals with different digits of 100 or more. For corresponding and / or associated parts, the description of other embodiments may be referred to.

[0012] First Embodiment A first embodiment of a power conversion device according to the present invention will now be described with reference to the drawings. The power conversion device of the present embodiment is mounted on a vehicle such as an electric vehicle or a hybrid vehicle to form an on-board system.

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

[0014] The inverter 20 includes three phases of series-connected upper and lower arm switches. More specifically, the inverter 20 includes U-, V-, and W-phase upper arm switches SUH, SVH, and SWH, and U-, V-, and W-phase lower arm switches SUL, SVL, and SWL. The U-, V-, and W-phase upper arm diodes DUH, DVH, and DWH, which are freewheel diodes, are connected in inverse parallel to the U-, V-, and W-phase upper arm switches SUH, SVH, and SWH, and the U-, V-, and W-phase lower arm diodes DUL, DVL, and DWL, which are freewheel diodes, are connected in inverse parallel to the U-, V-, and W-phase lower arm switches SUL, SVL, and SWL. In this embodiment, the switches SUH, SVH, SWH, SUL, SVL, and SWL are IGBTs.

[0015] The inverter 20 includes a smoothing capacitor 21. A long high potential side path 22H is connected to a high potential side terminal of the smoothing capacitor 21. A long low potential side path 22L is connected to a low potential side terminal of the smoothing capacitor 21. The high potential side path 22H and the low potential side path 22L are, for example, electrical paths such as bus bars. The smoothing capacitor 21 may be provided outside the inverter 20.

[0016] First ends of the U-, V-, and W-phase armature windings 11U, 11V, and 11W are connected to a connection point between emitters, which are low potential terminals of the U-, V-, and W-phase upper arm switches SUH, SVH, and SWH, and collectors, which are high potential terminals of the U-, V-, and W-phase lower arm switches SUL, SVL, and SWL, via conductive members 23 such as bus bars. Second ends of the U-, V-, and W-phase armature windings 11U, 11V, and 11W are connected to each other at a neutral point O. In this embodiment, the U-, V-, and W-phase armature windings 11U, 11V, and 11W are set to have the same number of turns. As a result, the U-, V-, and W-phase armature windings 11U, 11V, and 11W are set to have the same inductance, for example.

[0017] A high potential side path 22H is connected to the collectors of the U-, V-, and W-phase upper arm switches SUH, SVH, and SWH. A low potential side path 22L is connected to the emitters of the U-, V-, and W-phase lower arm switches SUL, SVL, and SWL.

[0018] The system includes a first storage battery 31 (corresponding to a "first power storage unit") and a second storage battery 32 (corresponding to a "second power storage unit"). Each of the storage batteries 31, 32 is a power supply source for rotating and driving the rotor of the motor 10. Each of the storage batteries 31, 32 is a battery pack including a series connection of a plurality of unit batteries. The unit battery is a single battery cell that is a single cell, or a series connection of a plurality of battery cells. In this embodiment, the full charge capacity (specifically, for example, rated full charge capacity) [Ah] of each of the unit batteries constituting the first storage battery 31 and the second storage battery 32 is the same. The positive terminal of the first storage battery 31 is connected to the high potential side path 22H via the first fuse 41, and the negative terminal of the second storage battery 32 is connected to the low potential side path 22L via the second fuse 42. The terminal voltages (for example, rated voltages) of each of the battery cells constituting the battery pack are set to be the same, for example. The battery cells are, for example, secondary batteries such as lithium ion batteries. In this embodiment, the terminal voltage (e.g., rated voltage) of the first storage battery 31 is higher than the terminal voltage (e.g., rated voltage) of the second storage battery 32. This configuration can be realized, for example, by making the number of unit batteries constituting the first storage battery 31 greater than the number of unit batteries constituting the second storage battery 32.

[0019] The power conversion device includes a main switch for electrically connecting or disconnecting the first and second storage batteries 31, 32 and the inverter 20. More specifically, a high-side main switch SMRH, a low-side main switch SMRL, and a pre-charge main switch SMRP are provided as the main switches. In this embodiment, the main switches SMRH, SMRL, and SMRP are mechanical relays. When the main switches SMRH, SMRL, and SMRP are turned off, they block the flow of current in both directions, and when they are turned on, they allow the flow of current in both directions. The high-side main switch SMRH is provided on the high-side path 22H, and the low-side main switch SMRL is provided on the low-side path 22L. A series connection of the pre-charge main switch SMRP and the pre-charge resistor 40 is connected in parallel to the low-side main switch SMRL. The main switches SMRH, SMRL, and SMRP are not limited to mechanical relays, and may be, for example, semiconductor switching elements.

[0020] Each of the storage batteries 31, 32 can be charged by an external charger provided outside the vehicle through external charging control. The external charger is, for example, a stationary charger.

[0021] Each of the storage batteries 31 and 32 can supply power to a power supply target unit outside the vehicle through external power supply control. When the power supply target unit is a system power source, the external power supply control is also called V2G (Vehicle to Grid). When the power supply target unit is an electrical device in a building such as a residence, the external power supply control is also called V2H (Vehicle to Home).

[0022] The power conversion device includes a high-potential side connection switch DCRH and a low-potential side connection switch DCRL for electrically connecting or disconnecting an external charger or a power supply target unit and the first and second storage batteries 31 and 32. In this embodiment, each of the connection switches DCRH and DCRL is a mechanical relay. When each of the connection switches DCRH and DCRL is turned off, it blocks bidirectional current flow, and when each of the connection switches DCRH and DCRL is turned on, it allows bidirectional current flow. The high-potential side connection switch DCRH is provided in a portion of the high-potential side path 22H that is closer to the inverter 20 than the high-potential side main switch SMRH. The low-potential side connection switch DCRL is provided in a portion of the low-potential side path 22L that is closer to the inverter 20 than the low-potential side main switch SMRL. Note that each of the connection switches DCRH and DCRL is not limited to a mechanical relay, and may be, for example, a semiconductor switching element.

[0023] The power conversion device includes an inter-battery switch 50 (corresponding to an "inter-power storage unit switch"), a bypass switch 60, a first motor-side switch 71, a second motor-side switch 72, and a connection path 73 as components for switching the connection state of the first storage battery 31 and the second storage battery 32. In this embodiment, the inter-battery switch 50, the bypass switch 60, and each of the motor-side switches 71, 72 are mechanical relays. When the inter-battery switch 50, the bypass switch 60, and each of the motor-side switches 71, 72 are turned off, they block the flow of bidirectional current, and when they are turned on, they allow the flow of bidirectional current. Note that the inter-battery switch 50, the bypass switch 60, and each of the motor-side switches 71, 72 are not limited to mechanical relays, and may be, for example, semiconductor switching elements.

[0024] The inter-battery switch 50 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 50 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 50 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.

[0025] The bypass switch 60 connects the negative terminal of the first storage battery 31 and the low potential side path 22L. When the bypass switch 60 is turned on, the negative terminal of the first storage battery 31 and the negative terminal of the second storage battery 32 are electrically connected to each other. On the other hand, when the bypass switch 60 is turned off, the negative terminal of the first storage battery 31 and the negative terminal of the second storage battery 32 are electrically disconnected from each other.

[0026] In this embodiment, the first storage battery 31 and the second storage battery 32 configure a battery unit 30.

[0027] The connection path 73 is an electrical path that connects the positive terminal of the second storage battery 32 and the neutral point O. A first motor-side switch 71 and a second motor-side switch 72 are provided in this order from the second storage battery 32 on the connection path 73.

[0028] The power conversion device includes a neutral point capacitor 74 that is a capacitor that connects the connection path 73 and the low potential side path 22L. A first end of the neutral point capacitor 74 is connected to a portion of the connection path 73 between the first motor side switch 71 and the second motor side switch 72. A second end of the neutral point capacitor 74 is connected to a portion of the low potential side path 22L that is closer to the inverter 20 than the low potential side main switch SMRL and the pre-charge main switch SMRP.

[0029] By turning on the first motor side switch 71, the first end of the neutral point capacitor 74 and the positive terminal of the second storage battery 32 are electrically connected. On the other hand, by turning off the first motor side switch 71, the first end of the neutral point capacitor 74 and the positive terminal of the second storage battery 32 are electrically disconnected. By turning on the second motor side switch 72, the neutral point O of the armature winding 11 and the first end of the neutral point capacitor 74 are electrically connected. On the other hand, by turning off the second motor side switch 72, the neutral point O and the first end of the neutral point capacitor 74 are electrically disconnected.

[0030] The power conversion device includes a first current sensor 81A, a second current sensor 81B, a phase current sensor 82, and a motor current sensor 83 as current sensors for detecting currents flowing through various parts of the power conversion device. The first current sensor 81A detects a current flowing through the first storage battery 31, and the second current sensor 81B detects a current flowing through the second storage battery 32. The phase current sensor 82 detects a current flowing through the U-, V-, and W-phase armature windings 11U, 11V, and 11W. The motor current sensor 83 detects a current flowing through the connection path 73, and in this embodiment, detects a current flowing through a portion of the connection path 73 that is closer to the neutral point O than the connection point with the neutral point capacitor 74.

[0031] The power conversion device includes a capacitor voltage sensor 84 that detects the terminal voltage of the neutral point capacitor 74, a first voltage sensor 85A that detects the terminal voltage of the first storage battery 31, and a second voltage sensor 85B that detects the terminal voltage of the second storage battery 32. The power conversion device also includes a power supply voltage sensor 86 that detects the terminal voltage of the smoothing capacitor 21, a temperature sensor 87 that detects the temperatures of the first storage battery 31 and the second storage battery 32, and a rotation angle sensor (not shown) that detects the rotation angle (electrical angle) of the rotor.

[0032] The system includes a battery ECU 90 that controls the battery unit 30, a motor ECU 100 that controls the inverter 20, and an EVECU 110 that manages the system. The battery ECU 90 is an electronic control unit mainly composed of a microcomputer 91. The motor ECU 100 is an electronic control unit mainly composed of a microcomputer 101. The EVECU 110 is an electronic control unit mainly composed of a microcomputer 111, and is a higher-level control unit than the battery ECU 90 and the motor ECU 100. The battery ECU 90 and the motor ECU 100 are able to exchange information via the EVECU 110.

[0033] Each of the microcomputers 91, 101, and 111 includes a CPU (Central Processing Unit). The functions provided by each of the microcomputers 91, 101, and 111 can be provided by software recorded in a substantial memory device and a computer that executes the software, by software alone, by hardware alone, or by a combination of these. For example, when each of the microcomputers 91, 101, and 111 is provided by an electronic circuit that is hardware, the function can be provided by a digital circuit including a large number of logic circuits, or by an analog circuit. For example, each of the microcomputers 91, 101, and 111 executes a program stored in a non-transitory tangible storage medium as a storage unit provided in the microcomputer. The program includes, for example, a program of a process shown in FIG. 4, which will be described later. A set of instructions that constitute the program is executed, thereby executing a method corresponding to the program. The storage unit is, for example, a non-volatile memory. The program stored in the storage unit can be updated via a communication network such as the Internet, for example, OTA (Over The Air), etc.

[0034] The battery ECU 90 receives detection values ​​from a first current sensor 81A, a second current sensor 81B, a first voltage sensor 85A, a second voltage sensor 85B, and a temperature sensor 87. The motor ECU 100 receives detection values ​​from a phase current sensor 82, a motor current sensor 83, a capacitor voltage sensor 84, a power supply voltage sensor 86, and a rotation angle sensor.

[0035] The motor ECU 100 performs switching control of the upper and lower arm switches SUH-SWL of each phase constituting the inverter 20 to feedback control the control amount of the motor 10 to a command value based on the detection values ​​of each sensor. The control amount is, for example, torque. In each phase, the upper arm switch and the lower arm switch are alternately turned on. Through this feedback control, the rotational power of the rotor of the motor 10 is transmitted to the drive wheels, causing the vehicle to run.

[0036] The main switches SMRH, SMRL, SMRP, the inter-battery switch 50, the bypass switch 60, and the motor-side switches 71, 72 may be controlled by any one of the battery ECU 90, the motor ECU 100, or the EVECU 110, or may be controlled by an ECU other than the ECUs 90, 100, 110. In this embodiment, hereinafter, the main switches SMRH, SMRL, SMRP, the inter-battery switch 50, the bypass switch 60, and the motor-side switches 71, 72 are assumed to be controlled by the motor ECU 100.

[0037] Next, the external charging control will be described.

[0038] In this embodiment, the external charger is a high-voltage charger 200 or a low-voltage charger 210, as shown in Figs. 2 and 3. The charging voltage of the high-voltage charger 200 is higher than the terminal voltage (specifically, the rated voltage) of the series-connected body of the first and second storage batteries 31 and 32, and is, for example, 800V. The charging voltage of the low-voltage charger 210 is lower than the terminal voltage of the series-connected body of the first and second storage batteries 31 and 32 and higher than the terminal voltage (specifically, the rated voltage) of the first storage battery 32, and is, for example, 400V. When the first and second storage batteries 31 and 32 are charged by the external charger, the high-potential side connection switch DCRH and the low-potential side connection switch DCRL are switched on. On the other hand, when charging by the external charger is not performed or when the external charger is not connected to the power conversion device, the high-potential side connection switch DCRH and the low-potential side connection switch DCRL are switched off.

[0039] 2 shows the control state of each switch during external charging control using the high-voltage charger 200. The high-voltage charger 200 and the power conversion device are electrically connected when the charging plug of the high-voltage charger 200 is electrically connected to each connection switch DCRH, DCRL by the vehicle user. When the motor ECU 100 determines that the external charger connected to the power conversion device is the high-voltage charger 200, it turns off the pre-charge main switch SMRP, the bypass switch 60, the first motor side switch 71, the second motor side switch 72, and the upper and lower arm switches SUH to SWL of all phases of the inverter 20, and turns on the high potential side main switch SMRH, the low potential side main switch SMRL, and the inter-battery switch 50. As a result, the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage charger 200. As a result, a current flows through a closed circuit including the high-voltage charger 200, the high-potential side path 22H, the first storage battery 31, the inter-battery switch 50, the second storage battery 32, and the low-potential side path 22L, and the first storage battery 31 and the second storage battery 32 are charged in a state of being connected in series. At this time, since the upper arm switches SUH, SVH, SWH of the inverter 20 and the second motor-side switch 72 are turned off, it is possible to prevent the charging current of the high-voltage charger 200 from flowing to the inverter 20 and the armature winding 11.

[0040] 3 shows the control state of each switch during external charging control using the low-voltage charger 210. The low-voltage charger 210 and the power conversion device are electrically connected by electrically connecting the charging plug of the low-voltage charger 210 to each connection switch DCRH, DCRL by the vehicle user. When the motor ECU 100 determines that the external charger connected to the power conversion device is the low-voltage charger 210, it turns off the pre-charge main switch SMRP and the inter-battery switch 50, and turns on the high-potential side main switch SMRH, the low-potential side main switch SMRL, the bypass switch 60, the first motor side switch 71, and the second motor side switch 72. As a result, a current flows through a closed circuit including the low-voltage charger 210, the high-potential side path 22H, the first storage battery 31, the bypass switch 60, and the low-potential side path 22L, and the first storage battery 31 is charged.

[0041] In the external charging control by the low-voltage charger 210, the motor ECU 100 performs switching control to alternately turn on upper and lower arm switches (corresponding to "target switches") of at least two phases, or performs switching control of upper arm switches (corresponding to "target switches") of at least two phases with the lower arm switches SUL, SVL, and SWL of all phases of the inverter 20 turned off, thereby stepping down the output voltage of the low-voltage charger 210 and supplying it to the second storage battery 32. In detail, the motor ECU 100 performs step-down control, which is the above-mentioned switching control for controlling the voltage detected by the capacitor voltage sensor 84 (hereinafter, neutral point capacitor voltage VN) to a target charging voltage. As a result, a current flows through a closed circuit including the low-voltage charger 210, the high potential side path 22H, the upper arm switch of the inverter 20, the armature winding 11, the neutral point O, the second motor side switch 72, the first motor side switch 71, the second storage battery 32, and the low potential side path 22L, and the second storage battery 32 is charged. Since the terminal voltage of the second storage battery 32 is lower than the terminal voltage of the first storage battery 31 , the target charging voltage of the second storage battery 32 is lower than the target charging voltage of the first storage battery 31 .

[0042] 4 is a flowchart showing the procedure of an external charging control process of the low-voltage charger 210. This process is repeatedly executed by the motor ECU 100, for example, at a predetermined control period.

[0043] In step S10, a command charging current IN*, which is a command value for the charging current of the second storage battery 32, is calculated.

[0044] In steps S11 to S13, the number of phases of the inverter 20 that are switching-controlled in the external charging control is reduced as the calculated command charging current IN* is smaller. This reduces the switching loss of the inverter 20 and improves the charging efficiency of the second storage battery 32.

[0045] In addition, an interleaving process (corresponding to a phase shift process) is performed to shift the timing of turning on each of the switches of two or more phases to be switched on. This reduces pulsation of the current flowing through the connection path 73 and the second storage battery 32 during external charging control.

[0046] In step S11, it is determined whether the calculated command charging current IN* is greater than the threshold value Ith. If the determination in step S11 is affirmative, the process proceeds to step S12, where three phases are selected as the number of phases of the inverter 20 to be switched. That is, in this case, the phases of the inverter 20 to be switched are the U, V, and W phases.

[0047] In addition, the switching periods Tsw of the U-, V-, and W-phase switches of the inverter 20 are made the same, and the timings of switching on the U-, V-, and W-phase switches are shifted by "Tsw / 3" as shown in Fig. 5. In Su, Sv, and Sw in Fig. 5, H indicates an ON command for the upper arm switches SUH, SVH, and SWH of the U-, V-, and W-phases, and L indicates an OFF command for the upper arm switches SUH, SVH, and SWH of the U-, V-, and W-phases. Fig. 5 also shows the transitions of the current INr flowing through the connection path 73 and the phase currents Iur, Ivr, and Iwr flowing through the U-, V-, and W-phase armature windings 11U, 11V, and 11W. By shifting the timings of switching on by "Tsw / 3", the effect of reducing pulsation of the current flowing through the connection path 73 and the second storage battery 32 can be improved. Furthermore, when the command charging current IN* is large, the switches of all phases of the inverter 20 are subject to switching, so that the current flowing through the switches of the inverter 20 that are subject to switching control can be suppressed.

[0048] In step S14, the calculated command charging current IN* is divided by 3, which is the number of phases selected in step S12, to calculate U-, V-, and W-phase individual command currents Iu*, Iv*, and Iw* (=IN* / 3) which are command values ​​of the charging currents to be passed through the U-, V-, and W-phase armature windings 11U, 11V, and 11W. Then, for each of the U-, V-, and W-phases, a duty signal Duty is calculated for controlling the detected current of the phase current sensor 82 to the individual command current. Taking the U-phase as an example, the duty signal Duty is a signal indicating the ratio (=Ton / Tsw) of the on-period Ton of the U-phase upper arm switch SUH to one switching period Tsw.

[0049] In step S15, gate signals for the upper and lower arm switches are generated based on the calculated duty signal Duty for each of the U, V, and W phases. In step S16, step-down control of the inverter 20 is performed based on the generated gate signals for each of the U, V, and W phases. As a result, the currents flowing through the U, V, and W phase armature windings 11U, 11V, and 11W are controlled to the individual command currents, and the currents flowing through the connection path 73 and the second storage battery 32 are controlled to the command charging current IN*.

[0050] If it is determined in step S11 that the command charging current IN* is equal to or less than the threshold value Ith, the process proceeds to step S13, where two phases, which are a part of the number of phases of the inverter 20 to be switched and controlled, are selected. That is, in this case, the phases of the inverter 20 to be switched and controlled are any two of the U, V, and W phases (corresponding to "target phases"). In the following, for convenience, it is assumed that the U and V phases are selected.

[0051] Moreover, the switching periods Tsw of the U- and V-phase switches of the inverter 20 are made the same, and the timings at which the U- and V-phase switches are turned on are shifted by "Tsw / 2" as shown in Fig. 6. By shifting the timings at which the switches are turned on by "Tsw / 2", it is possible to reduce pulsation of the current flowing through the connection path 73 and the second storage battery 32. Furthermore, by reducing the number of phases of the switches that are the switching targets of the inverter 20 when the command charging current IN* is small, it is possible to reduce the switching loss of the inverter 20.

[0052] In step S14, the calculated command charging current IN* is divided by 2, which is the number of phases selected in step S13, to calculate U- and V-phase individual command currents Iu* and Iv* (=IN* / 2). Note that the W-phase individual command current Iw* is 0.

[0053] Then, for each of the U and V phases, a duty ratio signal Duty for controlling the detected current of the phase current sensor 82 to the individual command current is calculated. In step S15, for each of the U and V phases, gate signals for the upper and lower arm switches are generated based on the calculated duty ratio signal Duty. In step S16, for each of the U and V phases, step-down control of the inverter 20 is performed based on the generated gate signals. As a result, the currents flowing through the U and V phase armature windings 11U and 11V are controlled to the individual command currents, and thus the currents flowing through the connection path 73 and the second storage battery 32 are controlled to the command charging current IN*.

[0054] According to the present embodiment described above, during external charging control, pulsation of the charging current flowing through the connection path 73 and the second storage battery 32 can be reduced. Thereby, fluctuations in the inter-terminal voltage of the second storage battery 32 can be suppressed, and it can be suppressed that the inter-terminal voltage of the second storage battery 32 exceeds the upper limit value of the inter-terminal voltage of the second storage battery 32. In addition, the rated value of the pulsating current flowing through the neutral point capacitor 74 connected to the connection path 73 can be reduced, the capacitance of the neutral point capacitor 74 can be reduced, and the neutral point capacitor 74 can be miniaturized.

[0055] <Modification of the First Embodiment> In step S12 of FIG. 4, the motor ECU 100 may shift the switching timing to ON of each of the switches of the U, V, and W phases by a predetermined period TA shorter than "Tsw / 3" as shown in FIG. 7 instead of "Tsw / 3". The predetermined period TA may be set, for example, to "Tsw / 4 ≦ TA < Tsw / 3".

[0056] <Second Embodiment> Hereinafter, the second embodiment will be described with reference to the drawings, centering on the differences from the first embodiment. In this embodiment, when external power supply control is performed, the processing shown in FIG. 4 above is applied.

[0057] 8 shows the control state of each switch during external power supply control in which power is supplied from the first and second storage batteries 31, 32 to the high-voltage power supply target 220. When the motor ECU 100 determines that the power supply target connected to the power conversion device is the high-voltage power supply target 220, it turns off the pre-charge main switch SMRP, the bypass switch 60, the first motor side switch 71, the second motor side switch 72, and the upper and lower arm switches SUH to SWL of all phases of the inverter 20, and turns on the connection switches DCRH, DCRL, the high-potential side main switch SMRH, the low-potential side main switch SMRL, and the inter-battery switch 50. This brings about a state in which the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage power supply target 220. As a result, current flows through a closed circuit including the first storage battery 31, the high potential side path 22H, the high voltage power supply target section 220, the low potential side path 22L and the second storage battery 32, and power is supplied from the first storage battery 31 and the second storage battery 32 to the high voltage power supply target section 220.

[0058] 9 shows the control state of each switch during external power supply control in which power is supplied from the first and second storage batteries 31 and 32 to the low-voltage power supply target 230. The rated voltage of the low-voltage power supply target 230 is lower than the rated voltage of the high-voltage power supply target 220. When the motor ECU 100 determines that the power supply target connected to the power conversion device is the low-voltage power supply target 230, it turns off the pre-charge main switch SMRP and the inter-battery switch 50, and turns on the connection switches DCRH and DCRL, the high-potential side main switch SMRH, the low-potential side main switch SMRL, the bypass switch 60, the first motor side switch 71, and the second motor side switch 72. As a result, a current flows through a closed circuit including the first storage battery 31, the high-potential side path 22H, the low-voltage power supply target 230, the low-potential side path 22L, and the bypass switch 60, and power is supplied from the first storage battery 31 to the low-voltage power supply target 230.

[0059] In the external power supply control for the low-voltage power supply target portion 230, the motor ECU 100 performs switching control for alternately turning on upper and lower arm switches (corresponding to "target switches") of at least two phases, or performs switching control for lower arm switches (corresponding to "target switches") of at least two phases in a state where the upper arm switches SUH, SVH, and SWH of all phases of the inverter 20 are turned off, thereby boosting the output voltage of the second storage battery 32 and supplying it to the low-voltage power supply target portion 230. In detail, the motor ECU 100 performs boost control, which is the switching control for controlling the power supply voltage VB, which is the detection voltage of the power supply voltage sensor 86, to the target power supply voltage. As a result, a current flows through a closed circuit including the second storage battery 32, the connection path 73, the armature winding 11, the inverter 20, the high potential side path 22H, the low-voltage power supply target portion 230, and the low potential side path 22L, and power is supplied from the second storage battery 32 to the low-voltage power supply target portion 230.

[0060] Next, the external power supply control according to this embodiment, which is executed by the motor ECU 100, will be described with reference to FIG.

[0061] In step S10, a command discharge current IN*, which is a command value for the discharge current of the second storage battery 32, is calculated.

[0062] In steps S11 to S13, the number of phases of the inverter 20 that are switched and controlled in the external power supply control is reduced as the calculated command discharge current IN* is smaller. More specifically, in step S11, it is determined whether the calculated command discharge current IN* is greater than a threshold value Ith. If the determination in step S11 is affirmative, the process proceeds to step S12, where three phases are selected as the number of phases of the inverter 20 that are switched and controlled. Interleaving processing is also performed.

[0063] In step S14, the calculated command discharge current IN* is divided by 3, which is the number of phases selected in step S12, to calculate U-, V-, and W-phase individual command currents Iu*, Iv*, and Iw* (=IN* / 3) which are command values ​​of the discharge currents to be flowed through the U-, V-, and W-phase armature windings 11U, 11V, and 11W. Then, for each of the U-, V-, and W-phases, a duty signal Duty for controlling the detected current of the phase current sensor 82 to the individual command current is calculated.

[0064] In step S15, gate signals for the upper and lower arm switches are generated for each of the U, V, and W phases based on the calculated duty signal Duty. In step S16, boost control of the inverter 20 is performed for each of the U, V, and W phases based on the generated gate signals. As a result, the currents flowing through the U, V, and W phase armature windings 11U, 11V, and 11W are controlled to individual command currents, and the current flowing through the connection path 73 is controlled to command discharge current IN*. At this time, pulsation of the currents flowing through the connection path 73 and the second storage battery 32 can be reduced by the interleaving process.

[0065] If it is determined in step S11 that the command discharge current IN* is equal to or less than the threshold value Ith, the process proceeds to step S13, where two phases are selected as the number of phases of the inverter 20 to be switched and controlled. Interleaving is also performed. In the following, for convenience, it is assumed that the U and V phases are selected.

[0066] In step S14, the calculated command discharge current IN* is divided by 2, which is the number of phases selected in step S13, to calculate U- and V-phase individual command currents Iu* and Iv* (=IN* / 2). Note that the W-phase individual command current Iw* is 0.

[0067] Then, for each of the U and V phases, a duty signal duty for controlling the detected current of the phase current sensor 82 to an individual command current is calculated. In step S15, for each of the U and V phases, gate signals for the upper and lower arm switches are generated based on the calculated duty signal duty. In step S16, for each of the U and V phases, a boost control of the inverter 20 is performed based on the generated gate signal. As a result, the current flowing through the U and V phase armature windings 11U, 11V is controlled to the individual command current, and thus the current flowing through the connection path 73 is controlled to the command discharge current IN*. At this time, the interleaving process can reduce pulsation of the current flowing through the connection path 73 and the second storage battery 32.

[0068] <Third embodiment> Hereinafter, the third embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, the motor ECU 100 performs power transmission control (specifically, for example, equalization control) for transmitting power from one of the first storage battery 31 and the second storage battery 32 to the other by performing switching control of the inverter 20.

[0069] 10 shows the control state of each switch during equalization control. During equalization control, each of the connection switches DCRH and DCRL is turned off.

[0070] The motor ECU 100 turns on the high potential side main switch SMRH, the low potential side main switch SMRL, the inter-battery switch 50, the first motor side switch 71, and the second motor side switch 72, and turns off the pre-charge main switch SMRP and the bypass switch 60. The motor ECU 100 also performs switching control for at least two phases of the inverter 20 to transfer power from one of the first storage battery 31 and the second storage battery 32 to the other.

[0071] In detail, the motor ECU 100 performs a first control to supply a current from the first storage battery 31 to the second storage battery 32 via the inverter 20, the armature winding 11, and the connection path 73 by performing a step-down control for at least two phases. Also, the motor ECU 100 performs a second control to supply a current to the first storage battery 31 via the second storage battery 32, the connection path 73, the armature winding 11, and the inverter 20 by performing a step-up control for at least two phases.

[0072] By the equalization control, for example, the SOC of each unit battery constituting the first storage battery 31 and the SOC of each unit battery constituting the second storage battery 32 can be made equal.

[0073] The process shown in Fig. 4 can be applied even during execution of the first control or the second control. Hereinafter, the control of this embodiment executed by the motor ECU 100 will be described with reference to Fig. 4, taking the first control as an example.

[0074] In step S10, a command current IN* that is a command value of a current to be passed through the connection path 73 in order to supply power from the first storage battery 31 to the second storage battery 32 is calculated.

[0075] In steps S11 to S13, the number of phases of the inverter 20 that are switching-controlled in the equalization control is reduced as the calculated command current IN* is smaller. More specifically, in step S11, it is determined whether the calculated command current IN* is greater than a threshold Ith. If the determination in step S11 is affirmative, the process proceeds to step S12, where three phases are selected as the number of phases of the inverter 20 that are switching-controlled.

[0076] In step S14, the calculated command current IN* is divided by 3, which is the number of phases selected in step S12, to calculate U-, V-, and W-phase individual command currents Iu*, Iv*, and Iw* (=IN* / 3), which are command values ​​for the currents to be passed through the U-, V-, and W-phase armature windings 11U, 11V, and 11W. Then, for each of the U-, V-, and W-phases, a duty signal Duty is calculated for controlling the currents detected by the phase current sensors 82 to the individual command currents.

[0077] In step S15, gate signals for the upper and lower arm switches are generated for each of the U, V, and W phases based on the calculated duty signal Duty. In step S16, step-down control of the inverter 20 is performed for each of the U, V, and W phases based on the generated gate signals. As a result, the currents flowing through the U-, V-, and W-phase armature windings 11U, 11V, and 11W are controlled to individual command currents, and the current flowing through the connection path 73 is controlled to command current IN*. At this time, pulsation of the currents flowing through the connection path 73, the first storage battery 31, and the second storage battery 32 can be reduced by the interleaving process.

[0078] If it is determined in step S11 that the command current IN* is equal to or less than the threshold value Ith, the process proceeds to step S13, where two phases are selected as the number of phases of the inverter 20 to be switched and controlled. Interleaving is also performed. In the following, for convenience, it is assumed that the U and V phases are selected.

[0079] In step S14, the calculated command current IN* is divided by 2, which is the number of phases selected in step S13, to calculate U- and V-phase individual command currents Iu* and Iv* (=IN* / 2). Note that the W-phase individual command current Iw* is 0.

[0080] Then, for each of the U and V phases, a duty signal duty for controlling the detected current of the phase current sensor 82 to an individual command current is calculated. In step S15, for each of the U and V phases, gate signals for the upper and lower arm switches are generated based on the calculated duty signal duty. In step S16, for each of the U and V phases, step-down control of the inverter 20 is performed based on the generated gate signals. As a result, the current flowing through the U and V phase armature windings 11U and 11V is controlled to the individual command current, and further the current flowing through the connection path 73 is controlled to the command current IN*. At this time, the interleaving process can reduce pulsation of the current flowing through the connection path 73, the first storage battery 31, and the second storage battery 32.

[0081] <Fourth embodiment> The fourth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in FIG. 11, the connection path 73 electrically connects the neutral point O of the armature winding 11 and the negative terminal of the first storage battery 31. The bypass switch 61 connects the positive terminal of the second storage battery 32 and the high potential side path 22H. The first end of the neutral point capacitor 75 is connected to a portion of the connection path 73 between the first motor side switch 71 and the second motor side switch 72. The second end of the neutral point capacitor 75 is connected to a portion of the high potential side path 22H that is closer to the inverter 20 than the high potential side main switch SMRH.

[0082] In this embodiment, the terminal voltage (for example, rated voltage) of the first storage battery 31 is lower than the terminal voltage (for example, rated voltage) of the second storage battery 32.

[0083] Next, the external charging control of this embodiment will be described. Fig. 12 shows the control state of each switch during external charging control using the low-voltage charger 210. When the motor ECU 100 determines that the external charger connected to the power conversion device is the low-voltage charger 210, it turns off the pre-charge main switch SMRP and the inter-battery switch 50, and turns on the high potential side main switch SMRH, the low potential side main switch SMRL, the bypass switch 61, the first motor side switch 71, and the second motor side switch 72. This causes the second storage battery 32 to be charged.

[0084] In the external charging control by the low-voltage charger 210, the motor ECU 100 performs switching control to alternately turn on upper and lower arm switches (corresponding to "target switches") of at least two phases, or performs switching control of lower arm switches (corresponding to "target switches") of at least two phases with the upper arm switches SUH, SVH, SWH of all phases of the inverter 20 turned off, thereby stepping down the output voltage of the low-voltage charger 210 and supplying it to the first storage battery 31. In detail, the motor ECU 100 performs step-down control, which is the above-mentioned switching control for controlling the neutral point capacitor voltage VN to the target charging voltage. As a result, the first storage battery 31 is charged. Since the terminal voltage of the first storage battery 31 is lower than the terminal voltage of the second storage battery 32, the target charging voltage of the first storage battery 31 is lower than the target charging voltage of the second storage battery 32.

[0085] 4 can be applied to the external charging control of this embodiment as well, as in the first embodiment. In this case, in step S10, the motor ECU 100 calculates a command charging current IN* that is a command value for the charging current of the first storage battery 31. As the calculated command charging current IN* becomes smaller, the motor ECU 100 reduces the number of phases of the inverter 20 that are switching-controlled in the external charging control, and also performs interleaving processing.

[0086] Next, the external power supply control of this embodiment will be described. Fig. 13 shows the control state of each switch during external power supply control in which power is supplied from the first and second storage batteries 31, 32 to the low-voltage power supply target unit 230. When the motor ECU 100 determines that the power supply target unit connected to the power conversion device is the low-voltage power supply target unit 230, it turns off the pre-charge main switch SMRP and the inter-battery switch 50, and turns on the connection switches DCRH, DCRL, the high-potential side main switch SMRH, the low-potential side main switch SMRL, the bypass switch 61, the first motor side switch 71, and the second motor side switch 72. As a result, power is supplied from the second storage battery 32 to the low-voltage power supply target unit 230.

[0087] In the external power supply control for the low-voltage power supply target portion 230, the motor ECU 100 performs switching control for alternately turning on upper and lower arm switches (corresponding to "target switches") of at least two phases, or performs switching control for the upper arm switches (corresponding to "target switches") of at least two phases in a state in which the lower arm switches SUL, SVL, SWL of all phases of the inverter 20 are turned off, thereby boosting the output voltage of the first storage battery 31 and supplying it to the low-voltage power supply target portion 230. In detail, the motor ECU 100 performs boost control, which is the above-mentioned switching control for controlling the power supply voltage VB to the target power supply voltage. As a result, power is supplied from the first storage battery 31 to the low-voltage power supply target portion 230.

[0088] 4 can be applied to the external power supply control of this embodiment as well, as in the second embodiment. In this case, in step S10, the motor ECU 100 calculates a command discharge current IN* that is a command value for the discharge current of the first storage battery 31. As the calculated command discharge current IN* becomes smaller, the motor ECU 100 reduces the number of phases of the inverter 20 that are switched and controlled in the external power supply control, and also performs interleaving processing.

[0089] Next, the equalization control of this embodiment will be described. Fig. 14 shows the control state of each switch during the equalization control. Note that during the equalization control, each of the connection switches DCRH and DCRL is turned off.

[0090] The motor ECU 100 turns on the high potential side main switch SMRH, the low potential side main switch SMRL, the inter-battery switch 50, the first motor side switch 71, and the second motor side switch 72, and turns off the pre-charge main switch SMRP and the bypass switch 61. The motor ECU 100 also performs switching control for at least two phases of the inverter 20 to transfer power from one of the first storage battery 31 and the second storage battery 32 to the other.

[0091] Specifically, the motor ECU 100 performs a first control to supply current from the second storage battery 32 to the first storage battery 31 by performing a step-down control for at least two phases. Also, the motor ECU 100 performs a second control to supply current from the first storage battery 31 to the second storage battery 32 by performing a step-up control for at least two phases.

[0092] 4 can be applied to the first control or the second control of the equalization control of this embodiment, as in the sixth embodiment. In this case, taking the first control as an example, in step S10, the motor ECU 100 calculates a command current IN* that is a command value of a current to be flowed through the connection path 73 for supplying power from the second storage battery 32 to the first storage battery 31. The smaller the calculated command current IN* is, the more the motor ECU 100 reduces the number of phases of the inverter 20 that are switching-controlled in the equalization control, and also performs interleaving processing.

[0093] According to the present embodiment described above, it is possible to achieve the same effects as those of the first to third embodiments.

[0094] <Other embodiments> Each of the above embodiments may be modified as follows.

[0095] In each of the above embodiments, the motor ECU 100 does not need to perform the processes of steps S11 to S13 in Fig. 4. In other words, the motor ECU 100 may fix the phases to be switched by the inverter 20 to two or three phases, regardless of the magnitude of the calculated IN*.

[0096] In each of the above embodiments, the power conversion device does not necessarily have to include either the first or second motor-side switch 71, 72. In addition, the power conversion device does not necessarily have to include both the first and second motor-side switches 71, 72.

[0097] The switches of the inverter 20 are not limited to IGBTs, and may be, for example, N-channel MOSFETs equipped with body diodes. In this case, the high potential side terminal of the N-channel MOSFET becomes the drain, and the low potential side terminal becomes the source.

[0098] The high potential side main switch SMRH does not have to be provided.

[0099] Instead of the low potential side main switch SMRL, a series connection of the pre-charge main switch SMRP and the pre-charge resistor 40 may be connected in parallel to the high potential side main switch SMRH. In this case, the low potential side main switch SMRL does not have to be provided.

[0100] The fuses 41 and 42 do not necessarily have to be provided.

[0101] The motor is not limited to a star-connected one, and may be a delta-connected one. The motor and inverter are not limited to a three-phase one, and may be a two-phase one, or a four-phase or more phase one. The motor is not limited to a permanent magnet-type synchronous machine having a permanent magnet as a field pole on the rotor, and may be a wound field-type synchronous machine having a field winding as a field pole on the rotor. In this case, the rotor may be provided with both a field winding and a permanent magnet. The motor is not limited to a synchronous machine, and may be an induction machine.

[0102] The control device that performs external charging, power supply control, and equalization control is not limited to the motor ECU 100. For example, each control may be performed by a plurality of control devices, such as the battery ECU 90, the EVECU 110, and the motor ECU 100, working together.

[0103] The power storage unit to be charged by the external charger is not limited to a storage battery. For example, it may be a large-capacity electric double-layer capacitor, or may be one that includes both a storage battery and an electric double-layer capacitor.

[0104] The moving body on which the power conversion device is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. The power conversion device is not limited to a moving body, but may be a stationary device.

[0105] The control device and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor and a memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control device and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control device and the method described in the present disclosure may be realized by one or more special-purpose computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by the computer. [Explanation of symbols]

[0106] 10...motor, 11U, 11V, 11W...armature winding, 20...inverter, 22H...high potential side path, 22L...low potential side path, 31, 32...first and second storage batteries, 50...inter-battery switch, 60...bypass switch, 73...connection path, 100...motor ECU.

Claims

1. An inverter (20) having upper and lower arm switches (SUH to SWL) for multiple phases; a motor (10) having an armature winding (11U to 11W) electrically connected to a low potential side terminal of the upper arm switch of each phase and a high potential side terminal of the lower arm switch of each phase; In a power conversion device comprising: a high potential side path (22H) electrically connecting a positive terminal of the first storage unit (31) and a high potential side terminal of the upper arm switch; a low potential side path (22L) electrically connecting a negative terminal of the second storage unit (32) and a low potential side terminal of the lower arm switch; an inter-storage unit switch (50) that, when turned on, electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit, and, when turned off, electrically disconnects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (60, 61) that electrically connects negative electrode terminals of the first power storage unit and the second power storage unit to each other and electrically connects positive electrode terminals of the first power storage unit and the second power storage unit to each other; a connection path (73) electrically connecting the negative terminal of the first storage unit or the positive terminal of the second storage unit to the armature winding; a control device (100) that performs switching control of a target switch, which is at least one of the upper and lower arm switches, in order to pass a current through the connection path; Equipped with The control device is a power conversion device, and when performing switching control of the target switches of two or more phases, the control device performs a phase shift process of shifting the timing of switching on each of the target switches of two or more phases.

2. The power conversion device according to claim 1 , wherein when the control device performs switching control of the target switches of all phases, the control device performs a process of shifting timings of switching on of each of the target switches of all phases as the phase shift process.

3. 3. The power conversion device according to claim 2, wherein in the phase shift process, the control device makes the switching periods of the target switches of all phases the same and shifts the switching timings of the target switches of all phases to be on by "the switching period / total number of phases".

4. 2. The power conversion device according to claim 1, wherein when the control device performs switching control of the target switches of a target phase that is a part of a plurality of phases and is two or more phases, the control device performs, as the phase shift process, a process of shifting a switching timing of each of the target switches of the target phase to on.

5. 5. The power conversion device according to claim 4, wherein in the phase shift process, the control device makes the switching periods of the target switches of the target phases the same, and shifts the switching timings of the target switches of the target phases to be on by "the switching period / number of the target phases".

6. the bypass switch (60) electrically connects the negative electrode terminal of the first power storage unit and the negative electrode terminal of the second power storage unit when turned on, and electrically disconnects the negative electrode terminal of the first power storage unit and the negative electrode terminal of the second power storage unit when turned off; The power conversion device according to claim 1 , wherein the connection path electrically connects the armature winding and a positive terminal of the second power storage unit.

7. The control device includes: When an external charger (210) is electrically connected to the high potential side path and the low potential side path, in a state in which the inter-storage unit switch is turned off and the bypass switch is turned on, switching control is performed on the upper arm switch, which is the target switch, to perform external charging control in which a current is caused to flow through a closed circuit including the external charger, the inverter, the armature winding, the connection path, and the second storage unit, thereby charging the second storage unit; The power conversion device according to claim 6 , wherein the phase shift process is performed in the external charging control.

8. The control device includes: When an external power supply target unit (230) is electrically connected to the high potential side path and the low potential side path, in a state in which the inter-storage unit switch is turned off and the bypass switch is turned on, switching control of the lower arm switch, which is the target switch, is performed to perform external power supply control for supplying a current from the second storage unit to the external power supply target unit via the connection path, the armature winding, and the inverter, The power conversion device according to claim 6 , wherein the phase shift process is performed in the external power supply control.

9. The control device includes: a first control for supplying a current from the first power storage unit to the second power storage unit via the inverter, the armature winding, and the connection path by performing switching control of the upper arm switch as the target switch in a state in which the inter-power storage unit switch is turned on and the bypass switch is turned off; a second control for supplying a current from the second power storage unit to the first power storage unit via the connection path, the armature winding, and the inverter by performing switching control of the lower arm switch as the target switch in a state in which the inter-power storage unit switch is turned on and the bypass switch is turned off; Do the following: The power conversion device according to claim 6 , wherein the control device performs the phase shift process in the first control or the second control.

10. the bypass switch (61) electrically connects the positive electrode terminal of the first power storage unit and the positive electrode terminal of the second power storage unit when turned on, and electrically disconnects the positive electrode terminal of the first power storage unit and the positive electrode terminal of the second power storage unit when turned off; The power conversion device according to claim 1 , wherein the connection path electrically connects the armature winding and a negative electrode terminal of the first power storage unit.

11. The control device includes: When an external charger (210) is electrically connected to the high potential side path and the low potential side path, in a state in which the inter-storage unit switch is turned off and the bypass switch is turned on, switching control is performed on the lower arm switch, which is the target switch, to perform external charging control in which a current is caused to flow through a closed circuit including the external charger, the first storage unit, the connection path, the armature winding, and the inverter, thereby charging the first storage unit; The power conversion device according to claim 10 , wherein the phase shift process is performed in the external charging control.

12. The control device includes: When an external power supply target part (230) is electrically connected to the high potential side path and the low potential side path, in a state in which the inter-storage unit switch is turned off and the bypass switch is turned on, switching control of the lower arm switch, which is the target switch, is performed to perform external power supply control in which a current is supplied to the external power supply target part via a closed circuit including the external power supply target part, the first power storage unit, the connection path, the armature winding, and the inverter; The power conversion device according to claim 10 , wherein the phase shift process is performed in the external power supply control.

13. The control device includes: a first control for supplying a current from the first power storage unit to the second power storage unit via the inverter, the armature winding, and the connection path by performing switching control of the upper arm switch as the target switch in a state in which the inter-power storage unit switch is turned on and the bypass switch is turned off; a second control for supplying a current from the second power storage unit to the first power storage unit via the connection path, the armature winding, and the inverter by performing switching control of the lower arm switch as the target switch in a state in which the inter-power storage unit switch is turned on and the bypass switch is turned off; Do the following: The power conversion device according to claim 10 , wherein the control device performs the phase shift process in the first control or the second control.

14. An inverter (20) having upper and lower arm switches (SUH to SWL) for multiple phases; a motor (10) having an armature winding (11U to 11W) electrically connected to a low potential side terminal of the upper arm switch of each phase and a high potential side terminal of the lower arm switch of each phase; A computer (101); A program applied to a power conversion device comprising: The power conversion device is a high potential side path (22H) electrically connecting a positive terminal of the first storage unit (31) and a high potential side terminal of the upper arm switch; a low potential side path (22L) electrically connecting a negative terminal of the second storage unit (32) and a low potential side terminal of the lower arm switch; an inter-storage unit switch (50) that, when turned on, electrically connects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit, and, when turned off, electrically disconnects the negative electrode terminal of the first storage unit and the positive electrode terminal of the second storage unit; a bypass switch (60, 61) that electrically connects negative electrode terminals of the first power storage unit and the second power storage unit to each other and electrically connects positive electrode terminals of the first power storage unit and the second power storage unit to each other; a connection path (73) electrically connecting the negative terminal of the first storage unit or the positive terminal of the second storage unit to the armature winding; Equipped with The computer includes: A process of performing switching control of a target switch, which is at least one of the upper and lower arm switches, so as to pass a current through the connection path; When performing switching control of the target switches of two or more phases, a phase shift process is performed to shift the timing of turning on each of the target switches of two or more phases; A program to execute.

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