Power supply system

Abstract

The problem to be solved by the present invention is to provide a power supply system capable of suppressing the occurrence of UV and OV when switching an operation target for voltage control of a body capacitor. In order to solve the above problem, the power supply system of the present invention is provided with a control device that operates the DC-DC converter and the power converter in any one of a charging mode, a power supply mode, and a mode of supplying power during charging. The control device performs body voltage control by operating the voltage converter in the power supply mode, and performs body voltage control by operating the power converter in the charging mode and the charging power supply mode. When a control mode is switched between a power supply mode and a charging power supply mode in response to the acquisition of a charging power supply request, the control device switches the power supply mode between the power supply mode and the charging power supply mode during a period from the acquisition of the charging power supply request to the switching of an operation object of body voltage control between a DC-DC converter and a semi-PFC circuit of a power converter. The body voltage is boosted by a predetermined amplitude from the time point when the charging power supply request is acquired.

Description

Technical Field

[0001] The present invention relates to a power supply system. More specifically, it relates to a power supply system capable of simultaneously performing charging and power supply, wherein the charging is charging a power storage device using an external power supply connected to an inlet, and the power supply is power supply to an external load connected to an outlet. Background Art

[0002] In recent years, in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy, research and development related to charging and power supply in mobile devices (mobility) equipped with secondary batteries that contribute to improving energy efficiency has been carried out.

[0003] Patent document 1 shows a vehicle power control device, which includes: a battery mounted on the vehicle; a charging terminal that can be connected to an external AC power source; a charging device that converts the AC power input from the charging terminal into DC power and charges the battery; a discharge terminal that can be connected to an external AC load; and a power supply device that converts the DC power from the battery into AC power and outputs it from the discharge terminal. According to the vehicle power control device shown in Patent document 1, by connecting the external AC power source and the AC load to the charging terminal and the discharge terminal respectively, the battery can be charged while the AC load is powered, so the convenience of the user can be improved.

[0004] [Prior Technical Literature]

[0005] (Patent Document)

[0006] Patent Document 1: Japanese Patent No. 5578209 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] In order to stably charge the power storage device and supply power to the external load, voltage control is required, that is, the voltage of the bulk capacitor provided in the power circuit connecting the power storage device, the input port, and the output port is maintained at a predetermined voltage. In addition, the voltage control of the bulk capacitor is often performed by operating various converter circuits connected to the bulk capacitor using a control device.

[0009] Furthermore, since the flow of electric power in the power circuit differs between when charging and when supplying power, for example, if charging is to be started during power supply, it is necessary to switch the converter circuit that operates to control the voltage of the bulk capacitor.

[0010] However, when switching the operation object for voltage control in this way, if the period of temporary suspension of voltage control is prolonged, a phenomenon called "under voltage (UV)" may occur, that is, the voltage of the body capacitor is lower than the specified lower limit threshold. In addition, even if such UV does not occur, a phenomenon called "over voltage (OV)" may occur, that is, the voltage of the body capacitor exceeds the specified upper limit threshold just after the voltage control using the new operation object begins. When such UV or OV occurs, the control device sometimes determines that an abnormality has occurred in the power circuit and stops the charging / power supply being executed, so it is preferable to suppress the occurrence of such UV and OV.

[0011] An object of the present invention is to provide a power supply system that can suppress the occurrence of UV and OV when switching an operation object for performing voltage control of a bulk capacitor, thereby contributing to improving energy efficiency.

[0012] [Technical means to solve the problem]

[0013] (1) The power supply system of the present invention (for example, the power supply system 1 described below) is characterized by comprising: a power storage device (for example, a high voltage storage battery B described below); a voltage converter (for example, a DC-DC converter described below); a current-direct current (DC-DC) converter 3) connected to the power storage device; an input port (e.g., input port 4 described later) capable of connecting an external power source (e.g., external AC power sources EP, EP' described later); an output port (e.g., output port 5 described later) capable of connecting an external load (e.g., external AC load EL described later); a power converter (e.g., power converter 6 described later) connected to the input port and the output port; a bulk capacitor (e.g., bulk capacitor 23 described later) disposed on a power line (e.g., power lines 21, 22 described later) connecting the voltage converter and the power converter; and a control device (e.g., control device 8 described later) controlling the voltage converter and the power storage device in any of the control modes of a charging mode for charging the power storage device with the external power source, a power supply mode for supplying power to the external load, and a charging power supply mode for supplying power to the external load while charging the power storage device. The aforementioned power converter is operated; and the aforementioned control device comprises: a charging power supply request acquisition unit (for example, a charging / power supply request acquisition unit 81 described later), which acquires a charging power supply request for charging the aforementioned power storage device or supplying power to the aforementioned external load; and a charging power supply control unit (for example, a charging power supply control unit 85 described later), which in the aforementioned power supply mode, performs voltage control of the voltage of the aforementioned body capacitor, that is, the body voltage, by operating the aforementioned voltage converter, and performs the aforementioned voltage control in the aforementioned charging mode and the aforementioned charging power supply mode by operating the aforementioned power converter; in the case where the aforementioned control mode is switched between the aforementioned power supply mode and the aforementioned charging power supply mode according to the acquisition of the aforementioned charging power supply request, the aforementioned charging power supply control unit, during the period from the acquisition of the aforementioned charging power supply request to the switching of the operation object of the aforementioned voltage control between the aforementioned voltage converter and the aforementioned power converter, causes the aforementioned body voltage to be increased or decreased by a specified amplitude from the time point when the aforementioned charging power supply request is acquired.

[0014] (2) In this case, it is preferred that the power converter comprises: a first converter circuit (e.g., the first converter circuit 71 described later), including two or more switch branches (e.g., the first switch branch 61 and the fourth switch branch 64 described later) connected to the power line; a second converter circuit (e.g., the second converter circuit 72 described later), including one or more switch branches (e.g., the second switch branch 62 and the third switch branch 63 described later) connected to the power line in parallel with the first converter circuit; and a switch circuit (e.g., the switch circuit 65 described later) capable of switching the first and second switch branches. The control device further comprises a switch control unit (e.g., the switch control unit 84 described below), which switches the switch circuit to the first connection state in the charging mode and switches the switch circuit to the second connection state in the power supply mode and the charging power supply mode. The charging power supply control unit switches the full power factor correction (Power Factor Correction) composed of the first and second converter circuits in the charging mode. A power factor correction (PFC) circuit is operated as a PFC converter with the input port as the input side to perform the voltage control. In the power supply mode, the voltage control is performed by operating the voltage converter. In the charging power supply mode, the voltage control is performed by operating the half PFC circuit composed of the first converter circuit as the PFC converter. In the case where the control mode is switched between the charging mode and the charging power supply mode according to the charging power supply request, the charging power supply control unit raises or lowers the body voltage by a specified amplitude from the time point when the charging power supply request is obtained until the operation object is switched between the full PFC circuit and the half PFC circuit.

[0015] (3) At this time, it is preferred that the charging power supply control unit, in the charging mode, performs the voltage control by operating the full PFC circuit as the PFC converter, and performs charging current control of the power storage device by operating the voltage converter; in the power supply mode, performs the voltage control by operating the voltage converter, and performs power supply current control to the external load by operating the second converter circuit as an inverter with the body capacitor as the input side; in the charging power supply mode, performs the voltage control by operating the half PFC circuit as the PFC converter, performs the power supply current control by operating the second converter circuit as the inverter, and performs charging current control by operating the voltage converter.

[0016] (4) At this time, preferably, when the charging power supply control unit changes the control mode from the charging mode to the charging power supply mode, while continuing to operate the first converter circuit as the PFC converter, it starts to operate the second converter circuit as the inverter.

[0017] (5) At this time, preferably, when the charging power supply control unit changes the control mode from the charging power supply mode to the charging mode, while continuing to operate the first converter circuit as the PFC converter, it starts to operate the second converter circuit as the PFC converter.

[0018] (6) At this time, preferably, when the charging power supply control unit changes the control mode from the power supply mode to the charging power supply mode, the charging power supply control unit starts operating the first converter circuit as the PFC converter while continuing to operate the second converter circuit as the inverter.

[0019] (7) At this time, preferably, when the charging power supply control unit changes the control mode from the charging power supply mode to the power supply mode, the charging power supply control unit stops the operation of the first converter circuit while continuing to operate the second converter circuit as the inverter.

[0020] (8) At this time, it is preferred that, when the operation objects before and after switching the control mode are defined as the pre-switching operation object and the post-switching operation object, respectively, the charging and power supply control unit, during the period from when the charging and power supply request is obtained to when the operation object is switched from the pre-switching operation object to the post-switching operation object, operates the pre-switching operation object to increase or decrease the body voltage by a specified amplitude from the time when the charging and power supply request is obtained.

[0021] (9) At this time, it is preferred that the control device further includes a target value setting unit (for example, a body voltage target value setting unit 86 described later), which sets the body voltage target value in the voltage control, and the charging and power supply control unit operates the operation object in the voltage control so that the body voltage becomes the body voltage target value. The target value setting unit causes the body voltage target value to rise or fall by a specified offset value from the time point when the charging and power supply request is obtained until the operation object is switched from the pre-switching operation object to the post-switching operation object.

[0022] (10) At this time, it is preferred that the control device further includes a power supply current acquisition unit (for example, the power supply current acquisition unit 87 described later), which acquires the power supply current to the external load, and when the control mode is switched between the power supply mode and the charging power supply mode, the target value setting unit changes the offset value according to the power supply current.

[0023] (Effects of the Invention)

[0024] (1) In the present invention, the charging power supply request acquisition unit acquires a charging power supply request for charging the power storage device or supplying power to an external load, and the charging power supply control unit performs voltage control of the body voltage by operating the voltage converter in the power supply mode, and performs voltage control by operating the power converter in the charging mode and the charging power supply mode. In addition, when the control mode is switched between the power supply mode and the charging power supply mode according to the acquisition of the charging power supply request, the charging power supply control unit raises or lowers the body voltage by a specified amplitude from the time when the charging power supply request is acquired to the time when the operation object of the voltage control is switched between the voltage converter and the power converter. According to the present invention, the charging power supply control unit can suppress the occurrence of UV by raising the body voltage by a specified amplitude from the time when the charging power supply request is acquired. In addition, the charging power supply control unit can suppress the occurrence of OV by lowering the body voltage by a specified amplitude from the time when the charging power supply request is acquired. Therefore, according to the present invention, by suppressing the occurrence of UV and OV when the control mode is switched, it is possible to suppress the forced stop of the charging / power supply being executed, so as a result, it is possible to contribute to improving energy efficiency.

[0025] (2) In the present invention, the switch control unit sets the switch circuit to the first connection state in the charging mode to connect the first and second converter circuits of the power converter to the input port, and sets the switch circuit to the second connection state in the power supply mode and the charging power supply mode to connect the first converter circuit to the input port and the second converter circuit to the output port. In addition, the charging power supply control unit performs voltage control by operating the full PFC circuit composed of the first and second converter circuits as a PFC converter in the charging mode, performs voltage control by operating the voltage converter in the power supply mode, and performs voltage control by operating the half PFC circuit composed of the first converter circuit as a PFC converter in the charging power supply mode. In addition, when the control mode is switched between the charging mode and the charging power supply mode, the charging power supply control unit raises or lowers the body voltage by a predetermined amount from the time when the charging power supply request is obtained until the operation object of the voltage control is switched between the full PFC circuit and the half PFC circuit, thereby suppressing the occurrence of UV and OV when the control mode is switched.

[0026] (3) According to the present invention, the charging power supply control unit performs voltage control by operating the full PFC circuit as a PFC converter in the charging mode, and performs charging current control by operating the voltage converter. In the power supply mode, the charging power supply control unit performs voltage control by operating the voltage converter, and performs power supply current control by operating the second converter circuit as an inverter. In addition, in the charging power supply mode, the charging power supply control unit performs voltage control by operating the half PFC circuit as a PFC converter, performs power supply current control by operating the second converter circuit as an inverter, and performs charging current control by operating the voltage converter. According to the present invention, a common power converter can be used for charging, power supply, and power supply during charging, so compared with the case where different units are used for charging and power supply, respectively, the cost can be reduced, and thus it can help improve energy efficiency.

[0027] (4) In the present invention, when the control mode is changed from the charging mode to the charging power supply mode, the charging power supply control unit continues to operate only the first converter circuit in the entire PFC circuit as a PFC converter, while starting to operate the second converter circuit that has previously operated as a PFC converter as an inverter. As a result, when the control mode is changed from the charging mode to the charging power supply mode, the occurrence of UV and OV can be suppressed as described above, while charging the power storage device continues and power supply to the external load begins.

[0028] (5) In the present invention, when the control mode is changed from the charging power supply mode to the charging mode, the charging power supply control unit starts to operate the second converter circuit, which has been operating as an inverter, as a PFC converter while continuing to operate the first converter circuit as a PFC converter. Thus, when the control mode is changed from the charging power supply mode to the charging mode, the generation of UV and OV can be suppressed as described above, and at the same time, charging of the power storage device can be continued and power supply to the external load can be stopped.

[0029] (6) In the present invention, when the control mode is changed from the power supply mode to the charging power supply mode, the charging power supply control unit starts to operate the first converter circuit as a PFC converter while continuing to operate the second converter circuit as an inverter. Thus, when the control mode is changed from the power supply mode to the charging power supply mode, the generation of UV and OV can be suppressed as described above, while power supply to the external load continues and charging of the power storage device starts.

[0030] (7) In the present invention, when the control mode is changed from the charging power supply mode to the power supply mode, the charging power supply control unit stops the operation of the first converter circuit that has been operating as a PFC converter while continuing to operate the second converter circuit as an inverter. Thus, when the control mode is changed from the charging power supply mode to the power supply mode, the generation of UV and OV can be suppressed as described above, and at the same time, power supply to the external load is continued and charging of the power storage device is stopped.

[0031] (8) In the present invention, the charging power supply control unit, during the period from when the charging power supply request is obtained to when the operation object of the voltage control is switched from the operation object before switching to the operation object after switching, raises the body voltage by a predetermined amplitude from the time point when the charging power supply request is obtained by operating the operation object before switching. Thus, when the control mode is switched, the body voltage when the voltage control using the operation object before switching is stopped can be kept away from the lower limit threshold, so that the occurrence of UV during the period from when the voltage control using the operation object before switching is stopped to when the voltage control using the operation object after switching is started can be suppressed. In addition, the charging power supply control unit, during the period from when the charging power supply request is obtained to when the operation object of the voltage control is switched from the operation object before switching to the operation object after switching, lowers the body voltage by a predetermined amplitude from the time point when the charging power supply request is obtained by operating the operation object before switching. Thus, when the control mode is switched, the body voltage when the voltage control using the operation object after switching is started can be kept away from the upper limit threshold, so that the occurrence of OV after the voltage control using the operation object after switching is started can be suppressed.

[0032] (9) In the present invention, the charging power supply control unit operates the operation object in the voltage control so that the body voltage becomes the body voltage target value set by the target value setting unit, and the target value setting unit increases or decreases the body voltage target value by a predetermined offset value from the time point when the charging power supply request is obtained until the operation object is switched from the operation object before switching to the operation object after switching. In this way, the occurrence of UV and OV when the control mode is switched can be suppressed.

[0033] (10) When the control mode is switched between the power supply mode and the charging power supply mode, that is, when the power supply to the external load continues before and after the control mode is switched, the amount of change in the body voltage during the temporary stop of the voltage control varies depending on the magnitude of the power supply current. Therefore, in the present invention, when the control mode is switched between the power supply mode and the charging power supply mode, the target value setting unit changes the offset value according to the power supply current to the external load. As a result, the change in the body voltage during the temporary stop of the voltage control can be estimated and the offset value can be set to an appropriate magnitude, so the occurrence of UV and OV when the control mode is switched between the power supply mode and the charging power supply mode can be more reliably suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a diagram showing the structure of an electric vehicle equipped with a power supply system according to an embodiment of the present invention.

[0035] Figure 2 The diagram shows the structure of a power supply system to which a three-phase four-wire external AC power supply is connected.

[0036] Figure 3 It is a functional block diagram of the control device.

[0037] Figure 4A is a diagram schematically illustrating the flow of electric power in the charging mode.

[0038] Figure 4B It is a diagram schematically showing the flow of electric power in the power supply mode.

[0039] Figure 4C The figure schematically shows the flow of electric power in the charging power supply mode.

[0040] Figure 5A This is a flowchart (part 1) showing the flow of the control mode determination process.

[0041] Figure 5B This is a flowchart (part 2) showing the flow of the control mode determination process.

[0042] Fig. 6AThis is a timing chart showing an example of a control flow of the power converter and the DC-DC converter in a transition period when the control mode is changed from the charging mode to the charging power supply mode.

[0043] Figure 6B This is a timing chart showing an example of a control flow of the power converter and the DC-DC converter in a transition period when the control mode is changed from the charging power supply mode to the charging mode.

[0044] Figure 6C This is a timing chart showing an example of a control flow of the power converter and the DC-DC converter in a transition period when the control mode is changed from the power supply mode to the charging power supply mode.

[0045] Fig.6D This is a timing chart showing an example of a control flow of the power converter and the DC-DC converter in a transition period when the control mode is changed from the charging power supply mode to the power supply mode.

[0046] Figure 7 This is a diagram showing an example of a change type (pattern) determination table.

[0047] Figure 8 This is a timing chart showing a control example when there is a concern about UV occurring when the power supply mode is switched from the power supply mode to the charging power supply mode.

[0048] Fig. 9 This is a timing chart showing a control example in the case where there is a concern that OV may occur when switching from the power supply mode to the charging power supply mode. DETAILED DESCRIPTION

[0049] Hereinafter, a power supply system according to an embodiment of the present invention will be described with reference to the drawings.

[0050] Figure 1 : is a diagram showing the structure of a power supply system 1 of the present embodiment and an electric vehicle V (hereinafter referred to as "vehicle") equipped with the power supply system 1. In addition, in the present embodiment, as the vehicle V, a pure electric vehicle that travels by supplying the power stored in the high-voltage battery B described later to a drive motor (not shown) and rotating the drive wheels (not shown) is taken as an example, but the present invention is not limited to this. The power supply system of the present invention is not limited to application in pure electric vehicles, and can be applied to any vehicle as long as it is an electric vehicle such as a hybrid vehicle or a fuel cell vehicle that uses the power stored in the high-voltage battery B to travel. In addition, the power supply system of the present invention can also be mounted on a mobile body such as an electric two-wheeled vehicle or an electric vertical take-off and landing (eVTOL), and is not limited to the above-mentioned electric vehicles.

[0051] The power supply system 1 includes: a high-voltage battery B as a power storage device; a DC-DC converter 3 connected to the high-voltage battery B; an input port 4 to which an external AC power source EP can be connected; an output port 5 to which an external AC load EL can be connected; a power converter 6 connected to these input port 4 and output port 5; a pair of power lines 21, 22 connecting the DC-DC converter 3 and the power converter 6; a body capacitor 23 connected between the DC-DC converter 3 and the power converter 6 among these power lines 21, 22; and a control device 8 for operating the DC-DC converter 3 and the power converter 6.

[0052] The input port 4 is connected to a switch circuit 65 (described later) of the power converter 6 via four power lines L1, L2, L3, and N1. The output port 5 is connected to a switch circuit 65 of the power converter 6 via two power lines L4 and N2.

[0053] like Figure 1 As shown, when the single-phase two-wire external AC power source EP is connected to the input port 4 via the charging cable C, the voltage line EL1 and the neutral line EN of the external AC power source EP are respectively connected to the power lines L1 and N1 extending from the input port 4. Thus, single-phase AC power can be supplied from the external AC power source EP to the power converter 6 via the power lines L1 and N1. In addition, when the single-phase two-wire external AC load EL is connected to the output port 5, the external AC load EL is connected to the power lines L4 and N2 extending from the output port 5. Thus, single-phase AC power can be supplied from the power converter 6 to the external AC load EL via the power lines L4 and N2.

[0054] In addition, the following Figure 1 As shown, the description is mainly for the case where a single-phase two-wire external AC power source EP is connected to the input port 4, but the present invention is not limited thereto. Figure 2 As shown, the three-phase four-wire external AC power source EP' can also be connected to the input port 4 via the charging cable C. In this case, the three voltage lines EL1, EL2, EL3 and the neutral line EN of the external AC power source EP' are respectively connected to the power lines L1, L2, L3, N1 extending from the input port 4. Thus, three-phase AC power can be supplied from the external AC power source EP' to the power converter 6 via the power lines L1, L2, L3, N1. In addition, when the three-phase four-wire external AC power source EP' is connected to the input port 4 in this way, single-phase AC power can also be supplied from the external AC power source EP' to the power converter 6 by using only two power lines L1, N1.

[0055] Back to Figure 1The high voltage battery B is a secondary battery capable of both discharging to convert chemical energy into electrical energy and charging to convert electrical energy into chemical energy. Hereinafter, a so-called lithium ion battery that performs charging and discharging by moving lithium ions between electrodes will be described as the high voltage battery B, but the present invention is not limited thereto.

[0056] One end of the DC-DC converter 3 is connected to the bulk capacitor 23, and the other end is connected to the high voltage battery B, and the DC power is stepped up and down between the bulk capacitor 23 and the high voltage battery B. The DC-DC converter 3 turns on / off a switching element (not shown) in accordance with a gate drive signal sent from the control device 8, thereby stepping up and down the DC power in the bulk capacitor 23 and outputting it to the high voltage battery B, or stepping up and down the DC power in the high voltage battery B and outputting it to the bulk capacitor 23.

[0057] The power converter 6 comprises: four switch branches 61, 62, 63, 64, which are respectively connected to the power lines 21, 22 at both ends in parallel with the body capacitor 23; a switch circuit 65, which connects these switch branches 61-64 to the input port 4 and the output port 5; a first electromagnetic interference (EMI) filter 68, which removes noise in the power lines L1, L2, L3, N1 connecting the input port 4 and the switch circuit 65; and a second EMI filter 69, which removes noise in the power lines L4, N2 connecting the output port 5 and the switch circuit 65.

[0058] The first switching arm 61 includes a first upper arm switching element 611 , a first lower arm switching element 612 , and a first choke coil 613 .

[0059] The switch elements 611, 612 include: a known power switch element such as a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT), which is turned on / off according to a gate drive signal sent from the control device 8; and a diode connected in parallel with the power switch element. These first upper arm switch element 611 and the first lower arm switch element 612 are connected in series. The drain of the first upper arm switch element 611 is connected to the positive side power line 21, the source of the first upper arm switch element 611 is connected to the drain of the first lower arm switch element 612, and the source of the first lower arm switch element 612 is connected to the negative side power line 22. One end of the first choke coil 613 is connected to the connection point of the first upper arm switch element 611 and the first lower arm switch element 612, and the other end is connected to the switch circuit 65.

[0060] The second switching arm 62 includes a second upper arm switching element 621 , a second lower arm switching element 622 , and a second choke coil 623 .

[0061] The switch elements 621, 622 include: a known power switch element such as a MOSFET or an IGBT, which is turned on / off according to a gate drive signal sent from the control device 8; and a diode, which is connected in parallel with the power switch element. These second upper arm switch elements 621 and second lower arm switch elements 622 are connected in series. The drain of the second upper arm switch element 621 is connected to the positive side power line 21, the source of the second upper arm switch element 621 is connected to the drain of the second lower arm switch element 622, and the source of the second lower arm switch element 622 is connected to the negative side power line 22. One end of the second choke coil 623 is connected to the connection point between the second upper arm switch element 621 and the second lower arm switch element 622, and the other end is connected to the switch circuit 65.

[0062] The third switching arm 63 includes a third upper arm switching element 631 , a third lower arm switching element 632 , and a third choke coil 633 .

[0063] The switch elements 631, 632 include: a known power switch element such as a MOSFET or an IGBT, which is turned on / off according to a gate drive signal sent from the control device 8; and a diode connected in parallel with the power switch element. These third upper arm switch element 631 and the third lower arm switch element 632 are connected in series. The drain of the third upper arm switch element 631 is connected to the positive side power line 21, the source of the third upper arm switch element 631 is connected to the drain of the third lower arm switch element 632, and the source of the third lower arm switch element 632 is connected to the negative side power line 22. One end of the third choke coil 633 is connected to the connection point between the third upper arm switch element 631 and the third lower arm switch element 632, and the other end is connected to the switch circuit 65.

[0064] The fourth switching arm 64 includes a fourth upper arm switching element 641 , a fourth lower arm switching element 642 , and a fourth choke coil 643 .

[0065] The switch elements 641, 642 include: a known power switch element such as a MOSFET or an IGBT, which is turned on / off according to a gate drive signal sent from the control device 8; and a diode, which is connected in parallel with the power switch element. These fourth upper arm switch elements 641 and fourth lower arm switch elements 642 are connected in series. The drain of the fourth upper arm switch element 641 is connected to the positive side power line 21, the source of the fourth upper arm switch element 641 is connected to the drain of the fourth lower arm switch element 642, and the source of the fourth lower arm switch element 642 is connected to the negative side power line 22. One end of the fourth choke coil 643 is connected to the connection point of the fourth upper arm switch element 641 and the fourth lower arm switch element 642, and the other end is connected to the switch circuit 65.

[0066] In addition, hereinafter, a circuit composed of a first switch branch 61 and a fourth switch branch 64 connected to the power lines 21, 22 in parallel with the body capacitor 23 will be referred to as a first converter circuit 71. In addition, a circuit composed of a second switch branch 62 and a third switch branch 63 connected to the power lines 21, 22 in parallel with the first converter circuit 71 will be referred to as a second converter circuit 72. In addition, hereinafter, the first and second converter circuits 71, 72 that operate as PFC converters in the charging mode described later will also be collectively referred to as a "full PFC circuit". In addition, the first converter circuit 71 that operates as a PFC converter in the charging power supply mode described later will also be referred to as a "half PFC circuit", which means including half of the above-mentioned PFC circuit.

[0067] The switch circuit 65 is a circuit that connects the input / output terminals of the four switch arms 61 , 62 , 63 , 64 , namely the choke coils 613 , 623 , 633 , 643 , to a total of six power lines L1 , L2 , L3 , L4 , N1 , N2 . The switch circuit 65 includes a first relay 66 and a second relay 67 that operate in response to a command signal from the control device 8 .

[0068] like Figure 1 As shown, the switch circuit 65 always connects the first choke coil 613 of the first switch branch 61 to the power line L1 connected to the input port 4 , and always connects the fourth choke coil 643 of the fourth switch branch 64 to the power line N1 connected to the input port 4 .

[0069] The first relay 66 can switch the second choke coil 623 of the second switch branch 62 to a total of three states according to the command signal from the control device 8, namely, the state of being connected to the power line L1 extending from the input port 4, the state of being connected to the power line L2 extending from the input port 4, and the state of being connected to the power line L4 extending from the output port 5.

[0070] The second relay 67 can switch the third choke coil 633 of the third switch branch 63 to a total of three states according to the command signal from the control device 8, namely, the state connected to the power line N1 extending from the input port 4, the state connected to the power line L3 extending from the input port 4, and the state connected to the power line N2 extending from the output port 5.

[0071] The switch circuit 65 is configured by combining the two three-state relays 66 and 67 described above, and thus can realize a total of nine connection states.

[0072] In addition, hereinafter, the state in which the second choke coil 623 of the second switch branch 62 is connected to the power line L1 extending from the input port 4 by the first relay 66, and the third choke coil 633 of the third switch branch 63 is connected to the power line N1 extending from the input port 4 by the second relay 67, that is, the state in which both the first converter circuit 71 and the second converter circuit 72 are connected to the input port 4 is referred to as the first connection state. More specifically, in the first connection state, the first choke coil 613 of the first switch branch 61 and the second choke coil 623 of the second switch branch 62 are connected to the common power line L1, and the third choke coil 633 of the third switch branch 63 and the fourth choke coil 643 of the fourth switch branch 64 are connected to the common power line N1.

[0073] In addition, the state in which the second choke coil 623 of the second switch branch 62 is connected to the power line L4 extending from the output port 5 by the first relay 66, and the third choke coil 633 of the third switch branch 63 is connected to the power line N2 extending from the output port 5 by the second relay 67, that is, the state in which the first converter circuit 71 and the second converter circuit 72 are respectively connected to the input port 4 and the output port 5 is called the second connection state.

[0074] In addition, the state in which the second choke coil 623 of the second switch branch 62 is connected to the power line L2 extending from the input port 4 by the first relay 66, and the third choke coil 633 of the third switch branch 63 is connected to the power line L3 extending from the input port 4 by the second relay 67 is called the third connection state.

[0075] As described above, in this embodiment, the switch circuit 65 is formed by combining two relays 66 and 67 that can switch between three states, but the present invention is not limited to this. As long as the switch circuit 65 can realize multiple connection states as described above, it is not limited to three-state relays 66 and 67, and a known switching means such as a two-state relay or switch may also be used.

[0076] Figure 3This is a functional block diagram of the control device 8 that operates the DC-DC converter 3 and the power converter 6 as described above.

[0077] The control device 8 includes: a charging / power supply request acquisition unit 81 for acquiring a request for charging by an external AC power source EP or for supplying power to an external AC load EL; an operation status information acquisition unit 82 for acquiring operation status information related to the operation status of the power converter 6 and the DC-DC converter 3; a control mode determination unit 83 for determining the control mode of the control device 8 for the power converter 6 and the DC-DC converter 3; a switch control unit 84 for operating the switch circuit 65 of the power converter 6 in a manner specified by the determined control mode; a charging and power supply control unit 85 for operating the power converter 6 and the DC-DC converter 3 in a manner specified by the determined control mode; a body voltage target value setting unit 86 for setting a body voltage target value in the body voltage control described later performed by the charging and power supply control unit 85; a power supply current acquisition unit 87 for acquiring the power supply current supplied to the external AC load EL; and an abnormality determination unit 88 for determining whether there is an abnormality in the power supply system 1.

[0078] As referenced later Figure 4A and Figure 4C As described above, when the external AC power source EP is connected to the input port 4, the power supply system 1 can charge the high voltage battery B with the AC power supplied from the external AC power source EP. Figure 4B and Figure 4C In the above description, when the external AC load EL is connected to the output port 5 , the power supply system 1 can supply power to the external AC load EL using the DC power in the bulk capacitor 23 .

[0079] Thus, the charging / power supply request acquisition unit 81 acquires a request for charging by the external AC power source EP or for supplying power to the external AC load EL. Hereinafter, the request for starting charging by the external AC power source EP is referred to as a charging start request, and the request for stopping charging by the external AC power source EP is referred to as a charging stop request. In addition, the request for starting power supply to the external AC load EL is referred to as a power supply start request, and the request for stopping power supply to the external AC load EL is referred to as a power supply stop request. In addition, the charging start request, charging stop request, power supply start request, and power supply stop request acquired by the charging / power supply request acquisition unit 81 are collectively referred to as a "charging power supply request".

[0080] The charging / power supply request acquisition unit 81 acquires a charging start request, for example, when the external AC power source EP is connected to the input port 4 via the charging cable C based on a user operation. In addition, the charging / power supply request acquisition unit 81 acquires a charging stop request when, for example, the remaining amount of the high voltage battery B exceeds a prescribed amount or a prescribed charging stop operation performed by the user is detected after charging by the external AC power source EP starts.

[0081] The charging / power supply request acquisition unit 81 acquires a power supply start request, for example, when the external AC load EL is connected to the output port 5 and a user's prescribed power supply start operation on a power supply interface (for example, a power supply interface switch mounted on a vehicle or a smartphone owned by a user, etc.) is detected as an opportunity. In addition, the charging / power supply request acquisition unit 81 acquires a power supply stop request, for example, when a prescribed power supply stop operation on the above-mentioned power supply interface is detected after power supply to the external AC load EL is started.

[0082] The control mode determination unit 83 determines the control mode of the power converter 6 and the DC-DC converter 3 by the control units 84 and 85 described later. Figure 4A to Figure 4C As described above, the control units 84 and 85 can be configured to operate in different charging modes (see Figure 4A ), power supply mode (refer to Figure 4B ) and charging power supply mode (refer to Figure 4C ) in any of the three control modes consisting of the power converter 6 and the DC-DC converter 3 are operated.

[0083] Figure 4A The dashed arrows schematically illustrate the flow of electric power when the control units 84 and 85 operate the power converter 6 and the DC-DC converter 3 in the charging mode.

[0084] In the charging mode, the switch control unit 84 operates the relays 66 and 67 of the switch circuit 65 to put the switch circuit 65 into the first connection state. As a result, the first converter circuit 71 and the second converter circuit 72 are both connected to the power lines L1 and N1 of the input port 4 .

[0085] In addition, in order to achieve Figure 4A The high voltage battery B is charged with power supplied from the external AC power source EP according to the flow of power as shown in the figure, and the charging power supply control unit 85 simultaneously performs body voltage control to control the voltage of the body capacitor 23, i.e., the body voltage, to a body voltage target value to be described later, and charging current control to control the charging current supplied to the high voltage battery B to a specified charging current target value.

[0086] More specifically, in the charging mode, the charging power supply control unit 85 uses the full PFC circuit composed of the first converter circuit 71 and the second converter circuit 72 as an operation object in the bulk voltage control, and operates the operation object as a PFC converter with the input port 4 as the input side, thereby performing bulk voltage control. More specifically, in the charging mode, the charging power supply control unit 85 operates the full PFC circuit in such a manner that the full PFC circuit operates as a PFC converter with the input port 4 as the AC input side and the bulk capacitor 23 as the DC output side. That is, the charging power supply control unit 85 operates the full PFC circuit in such a manner that the AC power input from the external AC power source EP connected to the input port 4 is converted into DC power in the full PFC circuit and the power factor is close to 1. In addition, at this time, the charging power supply control unit 85 operates the full PFC circuit as a PFC converter in such a manner that the bulk voltage becomes the bulk voltage target value set by the bulk voltage target value setting unit 86 described later.

[0087] Furthermore, in the charging mode, the charging power supply control unit 85 controls the body voltage by operating the full PFC circuit as a PFC converter as described above, and controls the charging current for the high voltage battery B by operating the DC-DC converter 3 .

[0088] In the charging mode, the control units 84 , 85 operate the power converter 6 and the DC-DC converter 3 as described above, thereby charging the high voltage battery B with the AC power supplied from the external AC power source EP connected to the inlet 4 .

[0089] Figure 4B The dotted arrows schematically illustrate the flow of electric power when the control units 84 and 85 operate the power converter 6 and the DC-DC converter 3 in the power supply mode.

[0090] In the power supply mode, the switch control unit 84 operates the relays 66 and 67 of the switch circuit 65 to put the switch circuit 65 into the second connection state. As a result, the second converter circuit 72 is connected to the power lines L4 and N2 of the output port 5 .

[0091] In addition, in order to achieve Figure 4B The flow of electric power is as shown in the figure, and the external AC load EL is supplied with power from the high voltage battery B. The charging power supply control unit 85 simultaneously performs body voltage control to control the body voltage to the body voltage target value, and power supply current control to control the power supply current supplied to the external AC load EL to the specified power supply current target value.

[0092] More specifically, the charging and power supply control unit 85 performs the body voltage control by operating the DC-DC converter 3 as the operation object in the body voltage control in the power supply mode so that the DC power in the high voltage battery B is supplied to the body capacitor 23. That is, the charging and power supply control unit 85 operates the DC-DC converter 3 so that the body voltage becomes the body voltage target value set by the body voltage target value setting unit 86 described later.

[0093] In addition, in the power supply mode, the charging power supply control unit 85 performs body voltage control by operating the DC-DC converter 3 as described above, and at the same time controls the power supply current to the external AC load EL by operating the second converter circuit 72 as an inverter with the body capacitor 23 as the input side.

[0094] In the power supply mode, the control units 84 and 85 operate the power converter 6 and the DC-DC converter 3 as described above to convert the DC power supplied from the high voltage battery B into AC power and supply power to the external AC load EL connected to the output port 5 .

[0095] Figure 4C The dashed arrows schematically show the flow of electric power when the control units 84 and 85 operate the power converter 6 and the DC-DC converter 3 in the charging power supply mode.

[0096] In the charging power supply mode, the switch control unit 84 operates the relays 66 and 67 of the switch circuit 65 to put the switch circuit 65 into the second connection state. Thus, the first converter circuit 71 is connected to the power line L1 and N1 of the input port 4, and the second converter circuit 72 is connected to the power line L4 and N2 of the output port 5.

[0097] In addition, in order to achieve Figure 4C The flow of electric power is as shown in the figure, while charging the high voltage battery B, power is supplied to the external AC load EL. The charging and power supply control unit 85 simultaneously performs body voltage control to control the body voltage to the body voltage target value, power supply current control to control the power supply current supplied to the external AC load EL to the power supply current target value, and charging current control to control the charging current supplied to the high voltage battery B to the charging current target value.

[0098] More specifically, in the charging power supply mode, the charging power supply control unit 85 uses the half PFC circuit formed by the first converter circuit 71 as an operation object in the bulk voltage control, and operates the operation object as a PFC converter with the input port 4 as the input side, thereby performing bulk voltage control. More specifically, in the charging power supply mode, the charging power supply control unit 85 operates the half PFC circuit in such a manner that the half PFC circuit operates as a PFC converter with the input port 4 as the AC input side and the bulk capacitor 23 as the DC output side. That is, the charging power supply control unit 85 operates the half PFC circuit in such a manner that the AC power input from the external AC power source EP connected to the input port 4 is converted into DC power in the half PFC circuit and the power factor is close to 1. In addition, at this time, the charging power supply control unit 85 operates the half PFC circuit as a PFC converter in such a manner that the bulk voltage becomes the bulk voltage target value set by the bulk voltage target value setting unit 86 described later.

[0099] In addition, in the charging power supply mode, the charging power supply control unit 85 performs body voltage control by operating the half PFC circuit as a PFC converter as described above, and controls the power supply current to the external AC load EL by operating the second converter circuit 72 as an inverter in the same manner as in the power supply mode, and performs charging current control by operating the DC-DC converter 3 in the same manner as in the charging mode.

[0100] In the charging power supply mode, the control units 84, 85 operate the power converter 6 and the DC-DC converter 3 as described above, thereby charging the high voltage battery B with the AC power supplied from the external AC power source EP connected to the input port 4, while converting the DC power in the body capacitor 23 into AC power and supplying power to the external AC load EL connected to the output port 5.

[0101] Back to Figure 3 The operation status information acquisition unit 82 acquires the operation status information indicating the current operation status of the power converter 6 and the DC-DC converter 3 based on the information sent from the control units 84 and 85. The operation status information acquisition unit 82 sends the acquired operation status information to the control mode determination unit 83. The control mode determination unit 83 can determine whether the operation status of the power converter 6 and the DC-DC converter 3 is a state of operation in the charging mode (hereinafter referred to as the "charging state"), a state of operation in the power supply mode (hereinafter referred to as the "power supply state"), a state of operation in the charging power supply mode (hereinafter referred to as the "charging power supply state"), or a stopped state by referring to the operation status information sent from the operation status information acquisition unit 82.

[0102] When the charging / power supply request acquisition unit 81 acquires a charging or power supply request, the control mode determination unit 83 determines the control mode of the control units 84 and 85 based on the operating state information sent from the operating state information acquisition unit 82 and the type of the acquired charging or power supply request.

[0103] Figure 5A and Figure 5B This is a flowchart showing a specific flow of a control mode determination process for determining a control mode in the control mode determination unit 83 . Figure 5A and Figure 5B The control mode determination process shown in FIG. 8 is executed by the control mode determination unit 83 when the charging / power supply request acquisition unit 81 acquires some charging and power supply request.

[0104] First, in step ST1, the control mode determination unit 83 determines whether the current operation state is a stop state by referring to the operation state information. If the determination result of step ST1 is YES, the control mode determination unit 83 transfers to step ST2; if it is NO, the control mode determination unit 83 transfers to step ST11.

[0105] In step ST2, the control mode determination unit 83 determines whether a charge start request is obtained. If the determination result of step ST2 is YES, that is, if a charge start request is obtained, the control mode determination unit 83 transfers to step ST3. If the determination result of step ST2 is NO, that is, if a power supply start request is obtained, the control mode determination unit 83 transfers to step ST4.

[0106] In step ST3, the control mode determination unit 83 determines the charging mode as the control mode, and then ends the control mode determination process. Figure 4A The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the stop state to the charging state.

[0107] In step ST4, the control mode determination unit 83 determines the power supply mode as the control mode, and then ends the control mode determination process. Figure 4B The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the stop state to the power supply state.

[0108] In step ST11, the control mode determination unit 83 determines whether the current operating state is the charging state by referring to the operating state information. If the determination result of step ST11 is YES, the control mode determination unit 83 proceeds to step ST12, and if NO, proceeds to step ST21.

[0109] In step ST12, the control mode determination unit 83 determines whether a charge stop request is obtained. If the determination result of step ST12 is YES, that is, if a charge stop request is obtained, the control mode determination unit 83 transfers to step ST13. If the determination result of step ST12 is NO, that is, if a power supply start request is obtained, the control mode determination unit 83 transfers to step ST14.

[0110] In step ST13, the control mode determination unit 83 stops the charging mode and then ends the control mode determination process. As a result, the control units 84 and 85 stop the operation of the power converter 6 and the DC-DC converter 3. In addition, as a result, the operation state of the power converter 6 and the DC-DC converter 3 changes from the charging state to the stopped state.

[0111] In step ST14, the control mode determination unit 83 changes the control mode from the charging mode to the charging power supply mode, and then ends the control mode determination process. Figure 4C The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the charging state to the charging power supply state.

[0112] In step ST21, the control mode determination unit 83 determines whether the current operating state is the power supply state by referring to the operating state information. If the determination result of step ST21 is YES, the control mode determination unit 83 transfers to step ST22. In addition, if the determination result of step ST21 is NO, that is, if the current operating state is the charging power supply state, the control mode determination unit 83 transfers to step ST31.

[0113] In step ST22, the control mode determination unit 83 determines whether a power supply stop request is obtained. If the determination result of step ST22 is YES, that is, if a power supply stop request is obtained, the control mode determination unit 83 transfers to step ST23. If the determination result of step ST22 is NO, that is, if a charging start request is obtained, the control mode determination unit 83 transfers to step ST24.

[0114] In step ST23, the control mode determination unit 83 stops the power supply mode and then ends the control mode determination process. As a result, the control units 84 and 85 stop the operation of the power converter 6 and the DC-DC converter 3. In addition, as a result, the operation state of the power converter 6 and the DC-DC converter 3 changes from the power supply state to the stop state.

[0115] In step ST24, the control mode determination unit 83 changes the control mode from the power supply mode to the charging power supply mode, and then ends the control mode determination process. Figure 4C The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the power supply state to the charging power supply state.

[0116] In step ST31, the control mode determination unit 83 determines whether a charge stop request is obtained. If the determination result of step ST31 is YES, that is, if a charge stop request is obtained, the control mode determination unit 83 transfers to step ST32. If the determination result of step ST31 is NO, that is, if a power supply stop request is obtained, the control mode determination unit 83 transfers to step ST33.

[0117] In step ST32, the control mode determination unit 83 changes the control mode from the charging power supply mode to the power supply mode, and then ends the control mode determination process. Figure 4B The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the charging power supply state to the power supply state.

[0118] In step ST33, the control mode determination unit 83 changes the control mode from the charging power supply mode to the charging mode, and then ends the control mode determination process. Figure 4A The described flow starts the operation of the power converter 6 and the DC-DC converter 3. In addition, the operation state of the power converter 6 and the DC-DC converter 3 is changed from the charging power supply state to the charging state.

[0119] Next, refer to Figure 6A to Figure 6D The timing chart shown in will explain an example of a control flow of the control device 8 on the power converter 6 and the DC-DC converter 3 in the transition period when the control mode is changed.

[0120] Fig. 6A This is when the control mode is changed from charging mode to charging power supply mode (refer to Figure 5AA timing diagram of an example of the control flow of the power converter 6 and the DC-DC converter 3 during the transition period of step ST14). Fig. 6A , a case where a power supply start request is acquired at time t1 while the high voltage battery B is being charged in the charging mode is shown.

[0121] exist Fig. 6A In the example shown, the control mode determination unit 83 starts changing the control mode from the charging mode to the charging power supply mode in response to the power supply start request being obtained at time t1. In addition, at the time when the power supply start request is obtained at time t1, the control mode is the charging mode. Therefore, at time t1, the charging power supply control unit 85 controls the body voltage of the full PFC circuit composed of the first converter circuit 71 and the second converter circuit 72 as the operation object, and operates the DC-DC converter 3, thereby controlling the charging current.

[0122] Then, at time t2, the charging power supply control unit 85 stops the function of the second converter circuit 72 that has been operating as a PFC converter, while continuing to operate only the first converter circuit 71 in the full PFC circuit as a PFC converter. In other words, the charging power supply control unit 85 switches the operation target of the body voltage control from the full PFC circuit to the half PFC circuit at time t2.

[0123] Then, at time t3, the charging power supply control unit 85 starts to operate the second converter circuit 72 as an inverter while continuing to operate the half PFC circuit as a PFC converter. Then, at time t4, the second converter circuit 72 operating as an inverter starts to supply stable AC power to the external AC load EL connected to the output port 5. Thus, at time t4, the transition from the charging mode to the charging power supply mode is completed.

[0124] As described above, when a power supply start request is received while charging the high voltage battery B in the charging mode, the control device 8 starts operating the second converter circuit 72 as an inverter while continuing to operate the first converter circuit 71 as a PFC converter, thereby switching the control mode from the charging mode to the charging power supply mode. As a result, the high voltage battery B can be continuously charged even when the operating state of the second converter circuit 72 is being switched between time t1 and t4.

[0125] Figure 6B This is when the control mode is changed from the charging power supply mode to the charging mode (refer to Figure 5B The timing diagram of the detailed control process of the power converter 6 and the DC-DC converter 3 during the transition period of step ST33 is shown in FIG. Figure 6B, a case where a power supply stop request is acquired at time t11 during the period when power is supplied to the external AC load EL while the high voltage battery B is charged in the charging power supply mode is shown.

[0126] exist Figure 6B In the example shown, the control mode determination unit 83 starts to change the control mode from the charging power supply mode to the charging mode in response to the power supply stop request being obtained at time t11. In addition, at the time point when the power supply stop request is obtained at time t11, the control mode is the charging power supply mode. Therefore, at time t11, the charging power supply control unit 85 controls the body voltage while operating the DC-DC converter 3 using the half PFC circuit composed of only the first converter circuit 71 as the operation object, thereby controlling the charging current. At the same time, the charging power supply control unit 85 controls the power supply current to the external AC load EL by operating the second converter circuit 72 as an inverter.

[0127] Then, at time t12, the charging power supply control unit 85 stops the function of the second converter circuit 72 that has been operating as an inverter while continuing to operate the half PFC circuit as a PFC converter. As a result, power supply to the external AC load EL stops after time t12.

[0128] Then, at time t13, the charging power supply control unit 85 continues to operate the first converter circuit 71 as a PFC converter and starts to operate the second converter circuit 72 as a PFC converter. In other words, at time t13, the charging power supply control unit 85 switches the operation object of the body voltage control from the half PFC circuit to the full PFC circuit. Thus, at time t13, the transition from the charging power supply mode to the charging mode is completed.

[0129] As described above, when a power supply stop request is received while the high voltage battery B is being charged and the external AC load EL is being supplied with power in the charging power supply mode, the control device 8 starts to operate the second converter circuit 72 as a PFC converter while continuing to operate the first converter circuit 71 as a PFC converter, thereby switching the control mode from the charging power supply mode to the charging mode. As a result, the high voltage battery B can be continuously charged even when the operating state of the second converter circuit 72 is being switched between time t11 and t13.

[0130] Figure 6C This is when the control mode is changed from the power supply mode to the charging power supply mode (refer to Figure 5B A timing diagram of an example of the control flow of the power converter 6 and the DC-DC converter 3 during the transition period of step ST24). Figure 6C, a case where a charging start request is acquired at time t21 while power is supplied to the external AC load EL in the power supply mode is shown.

[0131] exist Figure 6C In the example shown, the control mode determination unit 83 starts to change the control mode from the power supply mode to the charging power supply mode in response to the charging start request being obtained at time t21. In addition, at the time point when the charging start request is obtained at time t21, the control mode is the power supply mode. Therefore, at time t21, the charging power supply control unit 85 controls the body voltage of the DC-DC converter 3 as the operation object, and operates the second converter circuit 72 as an inverter, thereby controlling the power supply current to the external AC load EL.

[0132] Then, at time t22, the charging power supply control unit 85 stops the operation of the DC-DC converter 3 while continuing to operate the second converter circuit 72 as an inverter. That is, at time t22, the charging power supply control unit 85 stops the bulk voltage control with the DC-DC converter 3 as the operation object. In this way, when the bulk voltage control is stopped, the bulk voltage starts to drop after time t22, but the charging power supply control unit 85 performs the supply current control by operating the second converter circuit 72 as an inverter, so that the external AC load EL can be temporarily continued to be supplied with power.

[0133] Then, at time t23, the charging power supply control unit 85 continues to operate the second converter circuit 72 as an inverter, while starting the bulk voltage control with the half PFC circuit (i.e., the first converter circuit 71) stopped before as the operation object. In other words, at time t23, the charging power supply control unit 85 switches the operation object of the bulk voltage control from the DC-DC converter 3 to the half PFC circuit.

[0134] Then, at time t24, the charging power supply control unit 85 starts controlling the charging current of the high voltage battery B by operating the DC-DC converter 3. As a result, at time t24, the charging current starts to be supplied to the high voltage battery B. As a result, at time t24, the transition from the power supply mode to the charging power supply mode is completed.

[0135] As described above, when a charge start request is received while power is supplied to the external AC load EL in the power supply mode, the control device 8 starts to operate the first converter circuit 71 as a PFC converter while continuing to operate the second converter circuit 72 as an inverter, thereby switching the control mode from the power supply mode to the charging power supply mode. As a result, power can continue to be supplied to the external AC load EL even when the operating states of the DC-DC converter 3 and the first converter circuit 71 are being switched between time t21 and t24.

[0136] Fig.6D This is when the control mode is changed from the charging power supply mode to the charging mode (refer to Figure 5B A timing diagram of an example of the control flow of the power converter 6 and the DC-DC converter 3 during the transition period of step ST32). Fig.6D , a case where a charging stop request is acquired at time t31 during the period when power is supplied to the external AC load EL while the high voltage battery B is charged in the charging power supply mode is shown.

[0137] exist Fig.6D In the example shown, the control mode determination unit 83 starts to change the control mode from the charging power supply mode to the power supply mode according to the charging stop request obtained at time t31. In addition, at the time point when the charging stop request is obtained at time t31, the control mode is the charging power supply mode. Therefore, at time t31, the charging power supply control unit 85 controls the body voltage while operating the DC-DC converter 3 by taking the half PFC circuit composed of only the first converter circuit 71 as the operation object, thereby controlling the charging current. At the same time, the charging power supply control unit 85 controls the power supply current to the external AC load EL by operating the second converter circuit 72 as an inverter.

[0138] Thereafter, at time t32, the charging and power supply control unit 85 stops the function of the DC-DC converter 3 while continuing to operate the second converter circuit 72 as an inverter. Thus, the charging of the high voltage battery B is stopped.

[0139] Then, at time t33, the charging power supply control unit 85 continues to operate the second converter circuit 72 as an inverter while stopping the function of the first converter circuit 71. That is, at time t33, the charging power supply control unit 85 stops the bulk voltage control with the half PFC circuit as the operation object. In this way, when the bulk voltage control is stopped, the bulk voltage starts to drop after time t33, but the charging power supply control unit 85 controls the supply current by operating the second converter circuit 72 as an inverter, so that the external AC load EL can be temporarily continued to be supplied with power.

[0140] Then, at time t34, the charging power supply control unit 85 starts the bulk voltage control with the DC-DC converter 3 as the operation object. In other words, at time t34, the charging power supply control unit 85 switches the operation object of the bulk voltage control from the half-PFC circuit to the DC-DC converter 3. Thus, at time t34, the transition from the charging power supply mode to the power supply mode is completed.

[0141] As described above, when a charging stop request is received while the high voltage battery B is being charged and the external AC load EL is being supplied with power in the charging power supply mode, the control device 8 stops the operation of the first converter circuit 71 while continuing to operate the second converter circuit 72 as an inverter, thereby switching the control mode from the charging power supply mode to the power supply mode. Thus, during the period between time t31 and t34, the external AC load EL can continue to be supplied with power while the operating states of the DC-DC converter 3 and the first converter circuit 71 are being switched.

[0142] Back to Figure 3 The power supply current acquisition unit 87 acquires the power supply current to the external AC load EL using a current sensor (not shown) during the period when power is supplied to the external AC load EL in the power supply mode and the charging power supply mode.

[0143] The abnormality determination unit 88 monitors the body voltage during charging or power supply under the control of the control units 84 and 85, thereby detecting whether there is an abnormality in the power supply system 1. More specifically, during charging or power supply, the body voltage obtained by a voltage sensor (not shown) is lower than a predetermined lower limit threshold (see the following description). Figure 8 and Fig. 9 In the case of UV, etc., or the body voltage exceeds the upper limit threshold (see below). Figure 8 and Fig. 9 In the event of an abnormality (i.e., OV), the abnormality determination unit 88 determines that some abnormality has occurred in the power supply system 1, and stops the body voltage control, charging current control, and power supply current control being executed in the charging and power supply control unit 85.

[0144] The body voltage target value setting unit 86 sets the body voltage target value in the above-mentioned body voltage control to a value that is predetermined for each control mode within a range between a lower limit threshold and an upper limit threshold.

[0145] In the case where the control mode is switched between the power supply mode and the charging power supply mode (refer to Figure 6C and Fig.6D ), and when switching the control mode between the charging mode and the charging power supply mode (refer to Fig. 6A and Figure 6B), the charging power supply control unit 85 needs to switch the operation object of the body voltage control. That is, when the control mode is switched between the power supply mode and the charging power supply mode, the operation object of the body voltage control needs to be switched between the DC-DC converter 3 and the half PFC circuit (i.e., the first converter circuit 71), and when the control mode is switched between the charging mode and the charging power supply mode, the operation object of the body voltage control needs to be switched between the full PFC circuit (i.e., the first converter circuit 71 and the second converter circuit 72) and the half PFC circuit.

[0146] In addition, in this embodiment, the operation objects of the body voltage control before and after the switching control mode are defined as the operation object before switching and the operation object after switching. That is, when the control mode is changed from the power supply mode to the charging power supply mode (refer to Figure 6C ), the operation object before switching is the DC-DC converter 3, and the operation object after switching is the half PFC circuit. When the control mode is changed from the charging power supply mode to the power supply mode (refer to Fig.6D ), the operation object before switching is the half PFC circuit, and the operation object after switching is the DC-DC converter 3. In addition, when the control mode is changed from the charging mode to the charging power supply mode (refer to Fig. 6A ), the operation target before switching is the full PFC circuit, and the operation target after switching is the half PFC circuit. When the control mode is changed from the charging power supply mode to the charging mode (refer to Figure 6B ), the operation object before switching is a half PFC circuit, and the operation object after switching is a full PFC circuit.

[0147] As described above, when the control mode is switched, the operation object of the bulk voltage control also needs to be switched. Therefore, when the control mode is switched, the bulk voltage control performed by the charging and power supply control unit 85 may be temporarily stopped (see Figure 6C Time t22 to t23, and Fig.6D In addition, if the stop period of the body voltage control is set to be long, the body voltage may drop significantly and fall below the lower limit threshold value due to the discharge of the charge of the body capacitor 23 during this period, and the abnormality determination unit 88 may determine that an abnormality has occurred. In other words, if the stop period of the body voltage control when the control mode is switched is set to be long, there is a concern that UV may occur.

[0148] In addition, if the stop period of the body voltage control is set short, the above-mentioned UV is less likely to occur, but there is a case where the body voltage overshoots from the body voltage target value after the charge power supply control unit 85 operates the switched operation object and thus starts the body voltage control. Therefore, there is a case where the body voltage exceeds the upper limit threshold value after the body voltage control starts, and the abnormality determination unit 88 determines that an abnormality has occurred. In addition, the amount of overshoot of the body voltage after the start of such body voltage control depends largely on the circuit structure of the switched operation object and the setting of the body voltage control in the charge power supply control unit 85. For this reason, there is sometimes a concern that OV will occur.

[0149] As described above, when the control mode is switched, there is a concern that either UV or OV will occur. In addition, as described above, whether UV or OV will occur depends largely on the circuit structure and control settings. In addition, whether UV or OV will occur may vary depending on each control mode switching scenario. In addition, the fluctuation range of the body voltage when the control mode is switched may also vary depending on each control mode switching scenario.

[0150] Therefore, in order to suppress UV or OV when the control mode is switched as mentioned above, the body voltage target value setting unit 86 increases or decreases the body voltage target value from a specified reference value at a specified timing when the control mode is switched, thereby causing the body voltage under the body voltage control performed by the charging and power supply control unit 85 to be increased or decreased by a specified amplitude from a specified reference voltage.

[0151] More specifically, when the control mode is switched (i.e., when the control mode is switched between the power supply mode and the charging power supply mode, and when the control mode is switched between the charging mode and the charging power supply mode), the body voltage target value setting unit 86 increases or decreases the body voltage target value by a specified offset value from the reference value during the period from when the charging / power supply request acquisition unit 81 acquires the charging power supply request to when the operation object of the body voltage control performed by the charging power supply control unit 85 is switched from the operation object before switching to the operation object after switching, and during the period when the charging power supply control unit 85 performs body voltage control using the operation object before switching.

[0152] When the target value of the body voltage is increased or decreased at such a timing, the charging and power supply control unit 85 performs the body voltage control using the object of operation before switching, using the time point when the charging and power supply request is obtained as the reference voltage, and increases or decreases the body voltage from the reference voltage by an amount corresponding to the above-mentioned offset value during the period from when the charging and power supply request is obtained to when the object of operation of the body voltage control is switched from the object of operation before switching to the object of operation after switching. In this way, the occurrence of UV or OV when the control mode is switched can be suppressed.

[0153] That is, if there is a concern that UV will occur when the control mode is switched, the body voltage target value setting unit 86 increases the body voltage target value by the offset value from the reference value so that the body voltage at the time of the control mode switching is away from the lower limit threshold. In addition, if there is a concern that OV will occur when the control mode is switched, the body voltage target value setting unit 86 decreases the body voltage target value by the offset value from the reference value so that the body voltage at the time of the control mode switching is away from the upper limit threshold.

[0154] As described above, the concern about whether UV or OV will occur varies in each control mode switching scenario. In addition, the fluctuation range of the bulk voltage when the control mode is switched may also vary in each control mode switching scenario. Therefore, it is preferred that when a charging power supply request is obtained, the bulk voltage target value setting unit 86 refers to, for example, Figure 7 The specific change type of the body voltage target value when the control mode is switched is determined by using the table shown in the figure.

[0155] Figure 7 FIG. 1 is a diagram showing an example of a variation type determination table for determining the variation type of the target value of the bulk voltage when the control mode is switched. Figure 7 As shown in the table, the change type determination table determines the control mode before the change (or the operation object before the switch), the content based on the charging power supply request, Figure 5A and Figure 5B The flowchart determines the control mode after the transition (or the operation object after the switch) and the change type of the body voltage target value.

[0156] according to Figure 7 As an example of the variation type determination table, when the power supply mode is changed to the charging power supply mode, that is, when the operation target of the body voltage control is switched from the DC-DC converter 3 to the half PFC circuit, there is a concern that UV will occur, so the body voltage target value setting unit 86 increases the body voltage target value by a value A. When the power supply mode is changed to the power supply mode, that is, when the operation target of the body voltage control is switched from the half PFC circuit to the DC-DC converter 3, there is a concern that UV will occur, so the body voltage target value setting unit 86 increases the body voltage target value by a value B. When the charging mode is changed to the charging power supply mode, that is, when the operation target of the body voltage control is switched from the full PFC circuit to the half PFC circuit, there is a concern that OV will occur, so the body voltage target value setting unit 86 decreases the body voltage target value by a value C. In addition, when the power supply mode is changed to the charging mode, that is, when the operation target of the body voltage control is switched from the half PFC circuit to the full PFC circuit, the body voltage target value setting unit 86 decreases the body voltage target value by a value D.

[0157] also, Figure 7The change type determination table shown is only an example, and the present invention is not limited thereto. That is, for each transition type of the control mode, whether to increase or decrease the target value of the body voltage is preferably determined by designing and testing in advance with deviations assumed. In addition, the detailed value of the offset value is also preferably determined by designing and testing in advance with deviations assumed.

[0158] Next, refer to Figure 8 and Fig. 9 , specific control examples are described for the case where the occurrence of UV is suppressed by changing the body voltage target value and the case where the occurrence of OV is suppressed.

[0159] Figure 8 This is a timing diagram showing a control example when there is a concern about UV occurring when switching from the power supply mode to the charging power supply mode. Figure 8 , it is shown that during the period of supplying power to the external AC load EL in the power supply mode, a charging start request is obtained at time t41. Figure 8 , the following situation is shown: the charging power supply control unit 85 obtains a charging start request at time t41, and at time t43, ends the body voltage control with the DC-DC converter 3 as the operation object, and then at time t45, starts the body voltage control with the half PFC circuit as the operation object, and then at time t46, according to the fact that the charging current is stable, the transition to the charging power supply mode is completed.

[0160] First, a case where the target bulk voltage value is fixed and not changed during the period from when the charge start request is acquired at time t41 to when the bulk voltage control using the DC-DC converter 3, which is the object of the operation before switching, is terminated at time t43 will be described. In this case, if the bulk voltage control is stopped at time t43 while the supply current is continuously supplied to the external AC load EL, Figure 8 As shown in the second-to-last layer of , the body voltage starts to drop. Therefore, if the period during which the body voltage control is stopped is prolonged, it is possible that the body voltage falls below the lower limit threshold at time t44, and UV occurs before the body voltage control is restarted, causing the system to stop.

[0161] On the other hand, the bulk voltage target value setting unit 86 is in the period from when the charging start request is obtained to when the operation object is switched from the DC-DC converter 3 to the half PFC circuit, and the charging power supply control unit 85 is performing bulk voltage control using the DC-DC converter 3 (during the period of Figure 8In the example of the embodiment, it is between time t41 and t43. In order to suppress the occurrence of UV as described above, the value at time t41 when the charge power supply start request is obtained as a reference value, and the body voltage target value is increased by a predetermined offset value. Accordingly, the charge power supply control unit 85 performs body voltage control using the DC-DC converter 3, and during the period from time t42 to time t43, the body voltage at time t41 is used as the reference voltage, and the body voltage is increased by an amount corresponding to the offset value from the reference voltage. Therefore, if the body voltage control is stopped at time t43 while the power supply current is continuously supplied to the external AC load EL, the body voltage will not fall below the lower limit threshold until the body voltage control is started at time t45. That is, the occurrence of UV can be suppressed.

[0162] In addition, the drop range of the body voltage during the body voltage control stop period increases as the power supply current to the external AC load EL increases. Therefore, when the control mode is switched between the power supply mode and the charging power supply mode, that is, when the control mode is switched while continuing to supply power to the external AC load EL, the body voltage target value setting unit 86 preferably changes the offset value according to the magnitude of the power supply current acquired by the power supply current acquisition unit 87. More specifically, since the drop range of the body voltage increases as the power supply current increases, the body voltage target value setting unit 86 preferably changes the offset value to a larger value as the power supply current increases.

[0163] Fig. 9 This is a timing chart showing a control example when there is a concern that OV may occur when switching from the power supply mode to the charging power supply mode. Fig. 9 , it is shown that during the period of supplying power to the external AC load EL in the power supply mode, a charging start request is obtained at time t51. Fig. 9 , the following situation is shown: the charging power supply control unit 85 obtains a charging start request at time t51, and at time t53, ends the body voltage control with the DC-DC converter 3 as the operation object, and then at time t54, starts the body voltage control with the half PFC circuit as the operation object, and then at time t56, according to the fact that the charging current is stable, the transition to the charging power supply mode is completed.

[0164] First, a case where the target bulk voltage value is fixed and not changed during the period from when the charge start request is acquired at time t51 to when the bulk voltage control using the DC-DC converter 3 as the operation target before switching is terminated at time t53 will be described. In this case, when the bulk voltage control using the DC-DC converter 3 is terminated at time t53 and the bulk voltage control using the half PFC circuit as the operation target is restarted at time t54, as shown in FIG. Fig. 9As shown in the second-to-last layer of , there is a case where the body voltage overshoots from the body voltage target value immediately thereafter. Therefore, at time t55, there is a possibility that the body voltage exceeds the upper limit threshold, and OV occurs before the body voltage control is restarted, causing the system to stop.

[0165] On the other hand, the bulk voltage target value setting unit 86 is in the period from when the charging start request is obtained to when the operation object is switched from the DC-DC converter 3 to the half PFC circuit, and the charging power supply control unit 85 is performing bulk voltage control using the DC-DC converter 3 (during the period of Fig. 9 In the example, between time t51 and t53), in order to suppress the occurrence of OV as described above, the value at time t51 when the charge power supply start request is obtained as a reference value, and the body voltage target value is reduced by a specified offset value. Accordingly, the charge power supply control unit 85 performs body voltage control using the DC-DC converter 3, and during the period from time t52 to time t53, the body voltage at time t51 is used as the reference voltage, and the body voltage is reduced from the reference voltage by an amount corresponding to the offset value. Therefore, the body voltage at the time point when the body voltage control with the half PFC circuit as the operation object is started at time t54 can be further away from the upper limit threshold than when the body voltage target value is fixed. Therefore, after the body voltage control is just restarted at time t54, even if the body voltage overshoots from the body voltage target value, the body voltage will not exceed the upper limit threshold. That is, the occurrence of OV can be suppressed.

[0166] In addition, specific processes and references for suppressing the occurrence of UV and OV when switching from the charging power supply mode to the power supply mode, when switching from the charging mode to the charging power supply mode, and when switching from the charging power supply mode to the charging mode Figure 8 and Fig. 9 The described processes are almost the same, so detailed description is omitted.

[0167] According to the power supply system 1 of the present embodiment, the following effects are achieved.

[0168] (1) The charging / power supply request acquisition unit 81 acquires a charging power supply request for charging the high voltage storage battery B or for supplying power to the external AC load EL, and the charging power supply control unit 85 performs body voltage control by operating the DC-DC converter 3 in the power supply mode, and performs body voltage control by operating the power converter 6 in the charging mode and the charging power supply mode. In addition, when the control mode is switched between the power supply mode and the charging power supply mode according to the acquisition of the charging power supply request, the charging power supply control unit 85 raises or lowers the body voltage by a predetermined amount from the time when the charging power supply request is acquired until the operation object of the body voltage control is switched between the DC-DC converter 3 and the power converter 6. According to the power supply system 1, the charging power supply control unit 85 can suppress the occurrence of UV by raising the body voltage by a predetermined amount from the time when the charging power supply request is acquired. In addition, the charging power supply control unit 85 can suppress the occurrence of OV by lowering the body voltage by a predetermined amount from the time when the charging power supply request is acquired. Thus, according to the power supply system 1, by suppressing the occurrence of UV and OV when the control mode is switched, it is possible to suppress the forced stop of the charging / power supply being executed, so as a result, it is possible to contribute to improving energy efficiency.

[0169] (2) The switch control unit 84 sets the switch circuit 65 to the first connection state in the charging mode to connect the converter circuits 71 and 72 of the power converter 6 to the input port 4, and sets the switch circuit 65 to the second connection state in the power supply mode and the charging power supply mode to connect the first converter circuit 71 to the input port 4 and the second converter circuit 72 to the output port 5. In addition, the charging power supply control unit 85 performs bulk voltage control by operating the full PFC circuit composed of the converter circuits 71 and 72 as a PFC converter in the charging mode, performs bulk voltage control by operating the DC-DC converter 3 in the power supply mode, and performs bulk voltage control by operating the half PFC circuit composed of the first converter circuit 71 as a PFC converter in the charging power supply mode. In addition, when the control mode is switched between the charging mode and the charging power supply mode, the charging power supply control unit 85 raises or lowers the body voltage by a specified amplitude from the time when the charging power supply request is obtained until the operation object of the body voltage control is switched between the full PFC circuit and the half PFC circuit. This can suppress the occurrence of UV and OV when the control mode is switched.

[0170] (3) The charging power supply control unit 85 controls the bulk voltage by operating the full PFC circuit as a PFC converter in the charging mode, and controls the charging current by operating the DC-DC converter 3. In the power supply mode, the charging power supply control unit 85 controls the bulk voltage by operating the DC-DC converter 3, and controls the power supply current by operating the second converter circuit 72 as an inverter. In the charging power supply mode, the charging power supply control unit 85 controls the bulk voltage by operating the half PFC circuit as a PFC converter, controls the power supply current by operating the second converter circuit 72 as an inverter, and controls the charging current by operating the DC-DC converter 3. According to the power supply system 1, the common power converter 6 can be used for charging, power supply, and power supply during charging, so that the cost can be reduced compared to the case where different units are used for charging and power supply, and thus it can contribute to improving energy efficiency.

[0171] (4) When the control mode is changed from the charging mode to the charging power supply mode, the charging power supply control unit 85 continues to operate only the first converter circuit 71 of the entire PFC circuit as a PFC converter, while starting to operate the second converter circuit 72 that has been operating as a PFC converter as an inverter. As a result, when the control mode is changed from the charging mode to the charging power supply mode, the occurrence of UV and OV can be suppressed as described above, while the high voltage battery B continues to be charged and the external AC load EL starts to be powered.

[0172] (5) When the control mode is changed from the charging power supply mode to the charging mode, the charging power supply control unit 85 continues to operate the first converter circuit 71 as a PFC converter and starts to operate the second converter circuit 72, which has been operating as an inverter, as a PFC converter. Thus, when the control mode is changed from the charging power supply mode to the charging mode, the generation of UV and OV can be suppressed as described above, and at the same time, the high voltage storage battery B is continued to be charged and the power supply to the external AC load EL is stopped.

[0173] (6) When the control mode is changed from the power supply mode to the charging power supply mode, the charging power supply control unit 85 starts to operate the first converter circuit 71 as a PFC converter while continuing to operate the second converter circuit 72 as an inverter. Thus, when the control mode is changed from the power supply mode to the charging power supply mode, the generation of UV and OV can be suppressed as described above, and at the same time, power can be supplied to the external AC load EL and charging of the high voltage battery B can be started.

[0174] (7) When the control mode is changed from the charging power supply mode to the power supply mode, the charging power supply control unit 85 stops the operation of the first converter circuit 71 which has been operating as a PFC converter while continuing to operate the second converter circuit 72 as an inverter. Thus, when the control mode is changed from the charging power supply mode to the power supply mode, the generation of UV and OV can be suppressed as described above, and at the same time, power can be supplied to the external AC load EL and the charging of the high voltage battery B can be stopped.

[0175] (8) The charging power supply control unit 85 increases the body voltage by a predetermined amount from the time point when the charging power supply request is obtained by operating the pre-switching operation object during the period from when the charging power supply request is obtained to when the operation object of the body voltage control is switched from the pre-switching operation object to the post-switching operation object. As a result, when the control mode is switched, the body voltage when the body voltage control using the pre-switching operation object is stopped can be kept away from the lower limit threshold, so that UV can be suppressed from occurring during the period from when the voltage control using the pre-switching operation object is stopped to when the body voltage control using the post-switching operation object is started. In addition, the charging power supply control unit 85 decreases the body voltage by a predetermined amount from the time point when the charging power supply request is obtained by operating the pre-switching operation object during the period from when the charging power supply request is obtained to when the operation object of the body voltage control is switched from the pre-switching operation object to the post-switching operation object. As a result, when the control mode is switched, the body voltage when the body voltage control using the post-switching operation object is started can be kept away from the upper limit threshold, so that OV can be suppressed from occurring immediately after the body voltage control using the post-switching operation object is started.

[0176] (9) The charging and power supply control unit 85 operates the operation object in the body voltage control so that the body voltage becomes the body voltage target value set by the body voltage target value setting unit 86. The body voltage target value setting unit 86 increases or decreases the body voltage target value by a predetermined offset value from the time when the charging and power supply request is obtained until the operation object is switched from the operation object before switching to the operation object after switching. In this way, the occurrence of UV and OV when the control mode is switched can be suppressed.

[0177] (10) When the control mode is switched between the power supply mode and the charging power supply mode, that is, when the power supply to the external AC load EL continues before and after the control mode is switched, the amount of change in the body voltage during the temporary stop of the body voltage control varies depending on the magnitude of the power supply current. Therefore, when the control mode is switched between the power supply mode and the charging power supply mode, the body voltage target value setting unit 86 changes the offset value according to the power supply current to the external AC load EL. As a result, the change in the body voltage during the temporary stop of the body voltage control can be estimated and the offset value can be set to an appropriate magnitude, so the occurrence of UV and OV when the control mode is switched between the power supply mode and the charging power supply mode can be more reliably suppressed.

[0178] Although one embodiment of the present invention has been described above, the present invention is not limited thereto and the detailed structure may be appropriately changed within the scope of the gist of the present invention.

[0179] For example, in the above embodiment, a total of four switch branches 61 to 64 are provided for the power converter 6, and the first converter circuit 71 is formed by two switch branches 61 and 64, and the second converter circuit 72 is formed by two switch branches 62 and 63, but the present invention is not limited thereto. The first converter circuit 71 may also be formed by more than two switch branches, and the second converter circuit 72 may also be formed by more than one switch branch. In addition, when the number of switch branches constituting the second converter circuit 72 is set to one, it is preferred that the other switch branch is set to a rectifier circuit.

[0180] In addition, in the above-mentioned embodiment, the description is mainly made on the case where the single-phase two-wire external AC power source EP is connected to the input port 4, but the present invention is not limited thereto. Figure 2 As described above, a three-phase four-wire external AC power source EP' may be connected to the input port 4. In this case, when the three voltage lines EL1, EL2, EL3 and the neutral line EN of the external AC power source EP' are connected to the power lines L1, L2, L3, N1, respectively, in the charging mode, three-phase AC power can be supplied to the power converter 6 to charge the high voltage battery B, but in the charging power supply mode, it is not possible to supply the three-phase AC power to the power converter 6 while supplying power to the external AC load EL. However, in the charging power supply mode, it is possible to supply single-phase AC power from the external AC power source EP' to the power converter 6 while supplying power to the external AC load EL by using only the two power lines L1, N1.

[0181] Reference numerals

[0182] V: Vehicle

[0183] 1: Power system

[0184] B: High voltage battery (power storage device)

[0185] 21,22: Power lines

[0186] 23: Body capacitor (capacitor)

[0187] 3: DC-DC converter (voltage converter)

[0188] 4: Input port

[0189] L1, L2, L3, N1: Power lines

[0190] EP, EP': External AC power supply (external power supply)

[0191] EL1, EL2, EL3: voltage line

[0192] EN:Neutral

[0193] 5: Output port

[0194] L4, N2: Power Line

[0195] EL: External AC load (external load)

[0196] 6: Power Converter

[0197] 61: First switch branch

[0198] 62: Second switch branch

[0199] 63: The third switch branch

[0200] 64: Fourth switch branch

[0201] 65: Switching Circuit

[0202] 71: First converter circuit

[0203] 72: Second converter circuit

[0204] 8: Control device

[0205] 81: Charging / power supply request acquisition unit (request acquisition unit)

[0206] 82: Operation status information acquisition unit

[0207] 83: Control mode determination unit

[0208] 84: Switch control unit

[0209] 85: Charging power supply control unit

[0210] 86: Body voltage target value setting unit

[0211] 87: Power supply current acquisition unit

[0212] 88: Abnormality Judgment Department

Claims

1. A power supply system, characterized in that: have: Electricity storage device; a voltage converter connected to the power storage device; Input port, capable of connecting an external power source; Output port, capable of connecting external loads; A power converter connected to the input port and the output port; a bulk capacitor disposed on a power line connecting the voltage converter and the power converter; and, a control device that operates the voltage converter and the power converter in any one of a charging mode for charging the power storage device by means of the external power supply, a power supply mode for supplying power to the external load, and a charging power supply mode for supplying power to the external load while charging the power storage device; and The aforementioned control device comprises: a charging and power supply request acquisition unit that acquires a charging and power supply request for charging the power storage device or for supplying power to the external load; and a charging power supply control unit, which controls the voltage of the body capacitor, i.e., the body voltage, by operating the voltage converter in the power supply mode, and controls the voltage by operating the power converter in the charging mode and the charging power supply mode; In the case where the control mode is switched between the power supply mode and the charging power supply mode according to the acquisition of the charging power supply request, the charging power supply control unit raises or lowers the body voltage by a specified amplitude from the time point when the charging power supply request is acquired until the operation object of the voltage control is switched between the voltage converter and the power converter.

2. The power supply system according to claim 1, wherein: The power converter has: A first converter circuit includes two or more switch branches connected to the aforementioned power line; A second converter circuit includes one or more switch branches connected to the power line in parallel with the first converter circuit; and a switch circuit capable of switching between a first connection state in which both the first and second converter circuits are connected to the input port and a second connection state in which the first and second converter circuits are connected to the input port and the output port, respectively; The control device further includes a switch control unit, which sets the switch circuit to the first connection state in the charging mode and sets the switch circuit to the second connection state in the power supply mode and the charging power supply mode. The aforementioned charging power supply control unit, In the charging mode, the voltage control is performed by operating the full power factor correction circuit composed of the first and second converter circuits as a power factor correction converter with the input port as the input side. In the aforementioned power supply mode, the aforementioned voltage control is performed by operating the aforementioned voltage converter. In the charging power supply mode, the voltage control is performed by operating the half power factor correction circuit formed by the first converter circuit as the power factor correction converter. In the case where the control mode is switched between the charging mode and the charging power supply mode according to the acquisition of the charging power supply request, the charging power supply control unit raises or lowers the body voltage by a specified amplitude from the time point when the charging power supply request is acquired until the operation object is switched between the full power factor correction circuit and the half power factor correction circuit.

3. The power supply system according to claim 2, wherein: The aforementioned charging power supply control unit, In the charging mode, the voltage control is performed by operating the full power factor correction circuit as the power factor correction converter, and the charging current of the power storage device is controlled by operating the voltage converter. In the power supply mode, the voltage control is performed by operating the voltage converter, and the power supply current to the external load is controlled by operating the second converter circuit as an inverter with the bulk capacitor as the input side. In the aforementioned power supply mode during charging, the aforementioned voltage control is performed by operating the aforementioned half power factor correction circuit as the aforementioned power factor correction converter, the aforementioned power supply current control is performed by operating the aforementioned second converter circuit as the aforementioned inverter, and the aforementioned charging current control is performed by operating the aforementioned voltage converter.

4. The power supply system according to claim 3, wherein: When the charging power supply control unit changes the control mode from the charging mode to the charging power supply mode, the charging power supply control unit starts operating the second converter circuit as the inverter while continuing to operate the first converter circuit as the power factor correction converter.

5. The power supply system according to claim 3, wherein: When the charging power supply control unit changes the control mode from the charging power supply mode to the charging mode, the charging power supply control unit starts operating the second converter circuit as the power factor correction converter while continuing to operate the first converter circuit as the power factor correction converter.

6. The power supply system according to claim 3, wherein: When the charging power supply control unit changes the control mode from the power supply mode to the charging power supply mode, the charging power supply control unit starts operating the first converter circuit as the power factor correction converter while continuing to operate the second converter circuit as the inverter.

7. The power supply system according to claim 3, wherein: When the charging power supply control unit changes the control mode from the charging power supply mode to the power supply mode, the charging power supply control unit stops the operation of the first converter circuit while continuing to operate the second converter circuit as the inverter.

8. The power supply system according to any one of claims 1 to 7, wherein: In the case where the operation objects before and after switching the control mode are respectively defined as the pre-switching operation object and the post-switching operation object, the charging and power supply control unit, during the period from when the charging and power supply request is obtained to when the operation object is switched from the pre-switching operation object to the post-switching operation object, operates the pre-switching operation object to increase or decrease the body voltage by a specified amplitude from the time point when the charging and power supply request is obtained.

9. The power supply system according to claim 8, wherein: The control device further includes a target value setting unit for setting a target value of the body voltage in the voltage control. The charging and power supply control unit operates the operation object in the voltage control so that the body voltage becomes the body voltage target value. The target value setting unit increases or decreases the body voltage target value by a predetermined offset value from the time when the charging power supply request is obtained until the operation object is switched from the pre-switching operation object to the post-switching operation object.

10. The power supply system according to claim 9, wherein: The control device further comprises a supply current acquisition unit, which acquires the supply current to the external load. When the control mode is switched between the power supply mode and the charging power supply mode, the target value setting unit changes the offset value according to the power supply current.

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