Power supply system

Abstract

The problem addressed by the invention is that of providing a power supply system which can be charged and supplied with power using common units. In order to solve the problem, this power supply system (1) is provided with a power converter (6) and a control device (8). A power converter (6) is provided with a first converter circuit (71) including switching branches (61, 64), and a second converter circuit (72) including switching branches (62, 63). In a charging mode in which the converter circuits (71, 72) are operated as PFC converters to charge the high-voltage battery (B), the control device (8) operates the second converter circuit (72) as an inverter to charge the high-voltage battery (B) in a charging mode in which the converter circuits (71, 72) are operated as PFC converters to charge the high-voltage battery (B). In either a power supply mode for supplying power to an external AC load (EL) or a charging power supply mode for supplying power to the external AC load (EL) while charging the high-voltage battery (B) by operating the first converter circuit (71) as a PFC converter and operating the second converter circuit (72) as an inverter. The power converter (6) is operated.

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.

[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] According to the vehicle power control device shown in Patent Document 1, by connecting an external AC power source and an AC load to the charging terminal and the discharging terminal respectively, the battery can be charged while supplying power to the AC load, thereby improving user convenience. However, in order to perform such power supply during charging, two units, a charging device and a power supply device, need to be mounted on the vehicle, which may increase the cost.

[0009] An object of the present invention is to provide a power supply system which can utilize common units for charging and power supply, thereby helping to improve energy efficiency.

[0010] [Technical means to solve the problem]

[0011] (1) The power supply system of the present invention (for example, the power supply system 1 described later) comprises: a voltage converter (for example, a direct current-direct current (DC-DC) converter 3 described later) connected to a power storage device (for example, a high voltage battery B described later); a power converter (for example, a power converter 6 described later) connected to an input port (for example, an input port 4 described later) and an output port (for example, an output port 5 described later); a capacitor (for example, a body capacitor 23 described later) arranged on a power line (for example, power lines 21, 22 described later) connecting the voltage converter and the power converter; and a control device (for example, a control device 8 described later) for operating the voltage converter and the power converter. The power converter comprises: a first converter circuit (for example, a first converter circuit 71 described later), including two or more switch branches (for example, switch branches 61, 64 described later) connected to the power line; a second converter circuit (for example, a second converter circuit 72 described later), including one or more switch branches (for example, switch branches 62, 63 described later) connected to the power line in parallel with the first converter circuit; and a switch circuit (for example, a switch circuit 65 described later), 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 is characterized in that the voltage converter and the power converter are operated in any of the following control modes: a charging mode in which the power storage device is charged using an external power supply connected to the input port by setting the switch circuit to the first connection state and operating the first and second converter circuits as power factor correction (PFC) converters with the input port as the input side; a power supply mode in which power is supplied to an external load connected to the output port by setting the switch circuit to the second connection state and operating the second converter circuit as an inverter with the capacitor as the input side; and a charging power supply mode in which power is supplied to the external load while charging the power storage device by setting the switch circuit to the second connection state and operating the first converter circuit as the PFC converter and the second converter circuit as the inverter.

[0012] (2) At this time, it is preferred that the power supply system further comprises: an operation status information acquisition unit (for example, the operation status information acquisition unit 82 described later), which acquires the operation status information of the first and second converter circuits; a request acquisition unit (for example, the charging / power supply request acquisition unit 81 described later), which acquires a request for charging by the external power supply or for supplying power to the external load; and a control mode determination unit (for example, the control mode determination unit 83 described later), which determines the control mode based on the operation status information and the type of the request when the request is acquired.

[0013] (3) In this case, it is preferable that the control device controls the voltage of the capacitor by operating the first converter circuit as the PFC converter in the charging power supply mode.

[0014] (4) In this case, it is preferable that the control device controls the voltage of the capacitor by operating the first and second converter circuits as the PFC converters in the charging mode.

[0015] (5) At this time, it is preferred that the power supply system further includes a request acquisition unit (for example, the charging / power supply request acquisition unit 81 described later), which acquires a power supply start request to the external load or a charging start request by the external power supply, and when the power supply start request is acquired during charging of the power storage device, the control device continues to operate the first converter circuit as the PFC converter while starting to operate the second converter circuit as the inverter, thereby changing the control mode from the charging mode to the charging power supply mode.

[0016] (6) At this time, it is preferred that the power supply system further includes a request acquisition unit (for example, the charging / power supply request acquisition unit 81 described later), which acquires a power supply stop request to the external load or a charging stop request by the external power supply, and when the power supply stop request is acquired during the period of charging the power storage device and supplying power to the external load, the control device continues to operate the first converter circuit as the PFC converter and starts to operate the second converter circuit as the PFC converter, thereby changing the control mode from the charging power supply mode to the charging mode.

[0017] (7) At this time, it is preferred that the control device controls the voltage of the capacitor by operating the voltage converter in the power supply mode, and converts the DC power in the capacitor into AC power by operating the second converter circuit as the inverter, and supplies it to the external load.

[0018] (8) At this time, it is preferred that the power supply system further includes a request acquisition unit (for example, the charging / power supply request acquisition unit 81 described later), which acquires a power supply start request to the external load and a charging start request by the external power supply, and when the charging start request is acquired during power supply to the external load, the control device continues to operate the second converter circuit as the inverter while starting to operate the first converter circuit as the PFC converter, thereby changing the control mode from the power supply mode to the charging power supply mode.

[0019] (9) At this time, it is preferred that the power supply system further includes a request acquisition unit (for example, the charging / power supply request acquisition unit 81 described later), which acquires a power supply stop request to the external load or a charging stop request performed by the external power supply, and when the charging stop request is acquired during the period of charging the power storage device and supplying power to the external load, the control device stops the operation of the first converter circuit while continuing to operate the second converter circuit as the inverter, thereby changing the control mode from the charging power supply mode to the power supply mode.

[0020] (Effects of the Invention)

[0021] (1) A power converter of a power supply system of the present invention includes: a first converter circuit including two or more switch branches; a second converter circuit including one or more switch branches; and a switch circuit capable of switching the connection states between the first and second converter circuits and an input port and an output port. In a charging mode, the control device connects both the first and second converter circuits to the input port by setting the switch circuit to the first connection state, and charges the power storage device using an external power supply connected to the input port by operating the first and second converter circuits as PFC converters with the input port as an input side. In a power supply mode, the control device connects the first and second converter circuits to the input port and the output port, respectively, by setting the switch circuit to the second connection state, and supplies power to an external load connected to the output port by operating the second converter circuit as an inverter with a capacitor as an input side. In addition, in a charging power supply mode, the control device charges the power storage device while supplying power to the external load by setting the switch circuit to the second connection state, operating the first converter circuit as a PFC converter, and operating the second converter circuit as an inverter. As described above, according to the present invention, when powering and powering during charging, only the second converter circuit of the first and second converter circuits that operate as a PFC converter during charging is operated as an inverter. Therefore, according to the present invention, a common power converter can be used for charging, powering, and powering during charging, so compared with the case of using different units for charging and powering, respectively, the cost can be reduced, and further, it can contribute to improving energy efficiency.

[0022] (2) According to the present invention, when a request for charging by an external power source or for supplying power to an external load is obtained, the control mode of the control device is determined based on the operating state information of the first and second converter circuits and the type of the obtained request. Thus, according to the present invention, it is possible to switch to an appropriate control mode corresponding to the operating state of the first and second converter circuits when the request is obtained, so that it is possible to switch to a new control mode while continuing the charging operation and power supply operation performed before the request is obtained.

[0023] (3) According to the present invention, in the charging power supply mode, the control device controls the voltage of the capacitor by operating the first converter circuit as a PFC converter, thereby maintaining the voltage of the capacitor at a voltage specified for simultaneously charging the power storage device and supplying power to the external load.

[0024] (4) According to the present invention, in the charging mode, the control device controls the voltage of the capacitor by operating the first and second converter circuits as PFC converters, thereby maintaining the voltage of the capacitor at a voltage specified for charging the power storage device. In addition, according to the present invention, by operating both the first and second converter circuits as PFC converters, the power storage device can be charged more efficiently in a high load region than when only the first converter circuit is operated as a PFC converter.

[0025] (5) According to the present invention, when a power supply start request is received during charging of the power storage device, the control device starts operating the second converter circuit, which has been operating as the PFC converter, as an inverter while continuing to operate the first converter circuit as the PFC converter, thereby switching the control mode from the charging mode to the charging power supply mode. As a result, power supply to the external load can be started without reducing the charging current to the power storage device to zero.

[0026] (6) According to the present invention, when a power supply stop request is received while power is supplied to an external load while charging the power storage device, the control device 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, thereby switching the control mode from the charging power supply mode to the charging mode. As a result, power supply to the external load can be stopped without reducing the charging current to the power storage device to zero.

[0027] (7) According to the present invention, in the power supply mode, the control device controls the voltage of the capacitor by operating the voltage converter, and converts the DC power in the capacitor into AC power by operating the second converter circuit as an inverter, and supplies it to the external load. Therefore, according to the present invention, the voltage of the capacitor can be maintained at a voltage specified for power supply to the external load.

[0028] (8) According to the present invention, when a charge start request is received during power supply to an external load, the control device starts operating the first converter circuit, which has been stopped before, as a PFC converter while continuing to operate the second converter circuit as an inverter, thereby switching the control mode from the power supply mode to the charging power supply mode. As a result, the power storage device can be charged while continuing to supply power to the external load.

[0029] (9) According to the present invention, when a charge stop request is received while the power storage device is being charged and power is being supplied to an external load, the control device starts to stop the operation of the first converter circuit, which has been operating as a PFC converter, while continuing to operate the second converter circuit as an inverter, thereby switching the control mode from the charging power supply mode to the power supply mode. As a result, the charging of the power storage device can be stopped while power is being supplied to the external load. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] 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.

[0032] Figure 3 It is a functional block diagram of the control device.

[0033] Figure 4A is a diagram schematically illustrating the flow of electric power in the charging mode.

[0034] Figure 4B It is a diagram schematically showing the flow of electric power in the power supply mode.

[0035] Figure 4C The figure schematically shows the flow of electric power in the charging power supply mode.

[0036] Figure 5A This is a flowchart (part 1) showing the flow of the control mode determination process.

[0037] Figure 5B This is a flowchart (part 2) showing the flow of the control mode determination process.

[0038] Fig. 6A 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 mode to the charging power supply mode.

[0039] 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.

[0040] 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.

[0041] Fig.6DThis 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. DETAILED DESCRIPTION

[0042] Hereinafter, a power supply system according to an embodiment of the present invention will be described with reference to the drawings.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] like Figure 1As 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.

[0047] 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.

[0048] Back to Figure 1 The 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.

[0049] 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.

[0050] 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.

[0051] 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 .

[0052] 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.

[0053] 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 .

[0054] 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.

[0055] 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 .

[0056] 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.

[0057] 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 .

[0058] 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.

[0059] In addition, hereinafter, a circuit composed of two first switch branches 61 and a fourth switch branch 64 connected to the power lines 21 and 22 in parallel with the body capacitor 23 will be referred to as a first converter circuit 71. In addition, a circuit composed of two second switch branches 62 and a third switch branch 63 connected to the power lines 21 and 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 and 72 that operate as PFC converters in the charging mode to be 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 to be described later will also be referred to as a "half PFC circuit", which means including half of the above-mentioned full PFC circuit.

[0060] 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 .

[0061] 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 .

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Figure 3 This 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.

[0070] The control device 8 includes: a charging / power supply request acquisition unit 81, which acquires a request for charging by an external AC power source EP or for power supply to an external AC load EL; an operation status information acquisition unit 82, which acquires 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, which determines the control mode of the control device 8 for the power converter 6 and the DC-DC converter 3; a switch control unit 84, which operates the switch circuit 65 of the power converter 6 in a manner specified by the determined control mode; a power converter control unit 85, which operates the converter circuits 71, 72 of the power converter 6 in a manner specified by the determined control mode; and a DC-DC converter control unit 86, which operates the DC-DC converter 3 in a manner specified by the determined control mode.

[0071] 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 .

[0072] 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, a request for starting charging by the external AC power source EP is referred to as a charging start request, and a request for stopping charging by the external AC power source EP is referred to as a charging stop request. In addition, a request for starting power supply to the external AC load EL is referred to as a power supply start request, and a request for stopping power supply to the external AC load EL is referred to as a power supply stop request.

[0073] 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.

[0074] 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.

[0075] 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 to 86 described later. Figure 4A to Figure 4C As described above, the control units 84 to 86 can be configured to operate in different charging modes (see FIG. 1 ) by using different charging modes for the flow of power in the power converter 6 and the DC-DC converter 3. 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.

[0076] Figure 4A The dashed arrows schematically illustrate the flow of electric power when the control units 84 to 86 operate the power converter 6 and the DC-DC converter 3 in the charging mode.

[0077] 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 .

[0078] In addition, in order to achieve Figure 4A The flow of electric power as shown in the figure is used to charge the high voltage battery B with the electric power supplied from the external AC power source EP. The power converter control unit 85 performs body voltage control by operating the power converter 6 to control the voltage of the body capacitor 23, that is, the body voltage, to a specified target voltage. At the same time, the DC-DC converter control unit 86 performs charging current control by operating the DC-DC converter 3 to control the charging current supplied to the high voltage battery B to a specified target current.

[0079] More specifically, the power converter control unit 85 operates the full PFC circuit composed of the first converter circuit 71 and the second converter circuit 72 as a PFC converter with the input port 4 as the input side in the charging mode. More specifically, in the charging mode, the power converter 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 power converter 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 power converter control unit 85 performs bulk voltage control to maintain the voltage of the bulk capacitor 23 at the target voltage during charging specified by a process not shown in the figure by operating the full PFC circuit as a PFC converter.

[0080] In the charging mode, the DC-DC converter control unit 86 operates the DC-DC converter 3 so that the DC power in the bulk capacitor 23 is supplied to the high voltage battery B. At this time, the DC-DC converter control unit 86 operates the DC-DC converter 3 to perform charging current control to maintain the charging current supplied to the high voltage battery B at a target charging current specified by a process not shown.

[0081] In the charging mode, the control units 84 to 86 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 .

[0082] Figure 4B The dotted arrows schematically illustrate the flow of electric power when the control units 84 to 86 operate the power converter 6 and the DC-DC converter 3 in the power supply mode.

[0083] 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 .

[0084] In addition, in order to achieve Figure 4B The flow of electric power as shown in the figure is performed, and the external AC load EL is powered by the electric power of the high voltage battery B. The DC-DC converter control unit 86 controls the body voltage to a specified target voltage by operating the DC-DC converter 3. At the same time, the power converter control unit 85 controls the power supply current supplied to the external AC load EL to a specified target current by operating the power converter 5.

[0085] More specifically, in the power supply mode, the DC-DC converter control unit 86 operates the DC-DC converter 3 so that the DC power in the high voltage battery B is supplied to the body capacitor 23. At this time, the DC-DC converter control unit 86 operates the DC-DC converter 3 to perform body voltage control to maintain the body voltage at a target voltage during power supply specified by a process not shown.

[0086] In addition, in the power supply mode, the power converter control unit 85 operates the second converter circuit 72 as an inverter with the bulk capacitor 23 as the input side, thereby converting the DC power in the bulk capacitor 23 into AC power and supplying it to the external AC load EL. More specifically, in the power supply mode, the power converter control unit 85 operates the second converter circuit 72 as an inverter with the bulk capacitor 23 as the DC input side and the output port 5 as the AC output side, thereby controlling the supply current to the external AC load EL.

[0087] In the power supply mode, the control units 84 to 86 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 .

[0088] Figure 4C The dashed arrows schematically show the flow of electric power when the control units 84 to 86 operate the power converter 6 and the DC-DC converter 3 in the charging power supply mode.

[0089] 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.

[0090] In addition, in order to achieve Figure 4C The flow of electric power is as shown in the figure, charging the high voltage battery B while supplying power to the external AC load EL. The power converter control unit 85 performs body voltage control and power supply current control by operating the power converter 6, and the DC-DC converter control unit 86 performs charging current control by operating the DC-DC converter 3.

[0091] More specifically, the power converter control unit 85 performs bulk voltage control by operating the half PFC circuit composed of the first converter circuit 71 as a PFC with the input port 4 as the input side, and performs supply current control by operating the second converter circuit 72 as an inverter with the input side of the bulk capacitor 23. More specifically, in the charging power supply mode, the power converter 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 power converter 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 power converter control unit 85 performs bulk voltage control to maintain the voltage of the bulk capacitor 23 at the target voltage during charging power supply specified by the process not shown in the figure by operating the half PFC circuit as a PFC converter.

[0092] In addition, the power converter control unit 85 operates the half PFC circuit as a PFC converter as described above, and operates the second converter circuit 72 as an inverter with the body capacitor 23 as the input side, thereby converting the DC power in the body capacitor 23 into AC power and supplying it to the external AC load EL. More specifically, in the charging power supply mode, the power converter control unit 85 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 DC input side and the output port 5 as the AC output side.

[0093] In addition, the DC-DC converter control unit 86 operates the DC-DC converter 3 in the charging power supply mode so that the DC power in the bulk capacitor 23 is supplied to the high voltage battery B. At this time, the DC-DC converter control unit 86 operates the DC-DC converter 3 to perform charging current control to maintain the charging current supplied to the high voltage battery B at the target charging current during charging power supply specified by a process not shown.

[0094] In the charging power supply mode, the control units 84 to 86 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.

[0095] Back to Figure 3The 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 to 86. 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.

[0096] When the charging / power supply request acquisition unit 81 acquires a request for charging or power supply, the control mode determination unit 83 determines the control mode of the control units 84 to 86 based on the operating state information sent from the operating state information acquisition unit 82 and the acquired request type.

[0097] 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 request.

[0098] First, in step ST1, the control mode determination unit 83 determines whether the current operation state is the 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, and if it is NO, transfers to step ST11.

[0099] 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.

[0100] 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 4AThe 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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 to 86 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 to 86 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] Fig. 6A This is when the control mode is changed from charging mode to charging power supply mode (refer to Figure 5A 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 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.

[0115] exist Fig. 6A In the example shown, the control mode determination unit 83 starts to change 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 point when the power supply start request is obtained at time t1, the control mode is the charging mode. Therefore, at time t1, the power converter control unit 85 operates the full PFC circuit composed of the first converter circuit 71 and the second converter circuit 72 as a PFC converter, thereby performing body voltage control to maintain the voltage of the body capacitor 23 at a predetermined target voltage during charging, and the DC-DC converter control unit 86 operates the DC-DC converter 3, thereby performing charging current control to control the output current from the DC-DC converter 3 to the high voltage battery B.

[0116] Then, at time t2, the power converter control unit 85 stops the function of the second converter circuit 72 that has been operating as the PFC converter, while continuing to operate the first converter circuit 71 as the PFC converter. In other words, the power converter control unit 85 starts operating the half PFC circuit composed of the first converter circuit 71 as the PFC converter at time t2. That is, the operation target of the bulk voltage control is switched from the full PFC circuit to the half PFC circuit at time t2.

[0117] Then, at time t3, the power converter control unit 85 starts operating 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 supplying 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.

[0118] As described above, when a power supply start request is obtained during charging of 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, during the period between time t1 and t4 when the operating state of the second converter circuit 72 is being switched, the high voltage battery B can be continuously charged without reducing the charging current to 0.

[0119] Figure 6B 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 ST33). 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.

[0120] 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 power converter control unit 85 operates the half PFC circuit composed of only the first converter circuit 71 as a PFC converter, thereby performing body voltage control to maintain the voltage of the body capacitor 23 at a predetermined target voltage during charging power supply, and the DC-DC converter control unit 86 operates the DC-DC converter 3, thereby controlling the charging current output from the DC-DC converter 3 to the high voltage battery B. At the same time, the power converter control unit 85 operates the second converter circuit 72 as an inverter, thereby performing power supply current control to the external AC load EL.

[0121] Then, at time t12, the power converter 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.

[0122] Then, at time t13, the power converter control unit 85 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. In other words, the power converter control unit 85 starts to operate the full PFC circuit composed of the first converter circuit 71 and the second converter circuit 72 as a PFC converter at time t13. That is, the operation object of the body voltage control is switched from the half PFC circuit to the full PFC circuit at time t13. Then, at time t14, the control of the voltage of the body capacitor 23 that is stable by the full PFC circuit starts. As a result, at time t14, the transition from the charging power supply mode to the charging mode is completed.

[0123] 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 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, thereby switching the control mode from the charging power supply mode to the charging mode. Thus, during the period between time t11 and t14 when the operating state of the second converter circuit 72 is being switched, the high voltage battery B can be continuously charged without reducing the charging current to 0.

[0124] 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.

[0125] exist Figure 6CIn 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 according to the charging start request 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 DC-DC converter control unit 86 operates the DC-DC converter 3 to perform body voltage control to maintain the voltage of the body capacitor 23 at a predetermined power supply target voltage, and the power converter control unit 85 operates the second converter circuit 72 as an inverter to control the power supply current to the external AC load EL.

[0126] Then, at time t22, while the second converter circuit 72 continues to operate as an inverter by the power converter control unit 85, the DC-DC converter control unit 86 stops the function of the DC-DC converter 3 in order to switch the operation object of the bulk voltage control from the DC-DC converter 3 to the half PFC circuit. As a result, the voltage of the bulk capacitor 23 drops when the target voltage starts to be self-powered, but the charge accumulated in the bulk capacitor 23 can temporarily continue to supply power to the external AC load EL.

[0127] Then, at time t23, the power converter control unit 85 continues to operate the second converter circuit 72 as an inverter, and starts to operate the half PFC circuit (i.e., the first converter circuit 71) that was stopped before as a PFC converter. More specifically, the power converter control unit 85 starts the bulk voltage control of controlling the voltage of the bulk capacitor 23 by operating the half PFC circuit. As a result, the voltage of the bulk capacitor 23 starts to rise toward the target voltage during the predetermined charging power supply.

[0128] Then, at time t24, when the voltage of the body capacitor 23 rises to the target voltage during charging power supply, the DC-DC converter control unit 86 starts to control the charging current of the high voltage battery B by operating the DC-DC converter 3. Thus, at time t24, the charging of the high voltage battery B starts, and the transition from the power supply mode to the charging power supply mode is completed.

[0129] As described above, when a charge start request is obtained during the period of supplying power 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 changing the control mode from the power supply mode to the charging power supply mode. As a result, during the period between time t21 and t24 when the operating states of the DC-DC converter 3 and the first converter circuit 71 are being switched, power can be continuously supplied to the external AC load EL without reducing the power supplied to the external AC load EL to 0.

[0130] 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.

[0131] 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 in response to the charging stop request being 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 power converter control unit 85 operates the half PFC circuit composed of only the first converter circuit 71 as a PFC converter, thereby performing body voltage control to maintain the voltage of the body capacitor 23 at a predetermined target voltage during charging power supply, and the DC-DC converter control unit 86 operates the DC-DC converter 3, thereby performing charging current control for the high voltage battery B. At the same time, the power converter control unit 85 operates the second converter circuit 72 as an inverter, thereby performing power supply current control for the external AC load EL.

[0132] Thereafter, at time t32, while the power converter control unit 85 continues to operate the second converter circuit 72 as an inverter, the DC-DC converter control unit 86 stops the function of the DC-DC converter 3. Thus, charging of the high voltage battery B is stopped.

[0133] Then, at time t33, the power converter control unit 85 stops the function of the half PFC circuit in order to switch the operation object of the body voltage control from the half PFC circuit to the DC-DC converter 3 while continuing to operate the second converter circuit 72 as an inverter. As a result, the voltage of the body capacitor 23 drops when the target voltage starts to be self-powered, but the charge accumulated in the body capacitor 23 can temporarily continue to supply power to the external AC load EL.

[0134] Thereafter, at time t34, the DC-DC converter control unit 86 starts the bulk voltage control by operating the DC-DC converter 3. Thus, at time t34, the transition from the charging power supply mode to the power supply mode is completed.

[0135] 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 when the operating states of the DC-DC converter 3 and the first converter circuit 71 are being switched, power can be continuously supplied to the external AC load EL without reducing the power supplied to the external AC load EL to 0.

[0136] According to the power supply system 1 of the present embodiment, the following effects are achieved.

[0137] (1) The power converter 6 of the power supply system 1 includes: a first converter circuit 71 including two switch branches 61 and 64; a second converter circuit 72 including two switch branches 62 and 63; and a switch circuit 65 capable of switching the connection states between the converter circuits 71 and 72 and the input port 4 and the output port 5. In the charging mode, the control device 8 connects both the converter circuits 71 and 72 to the input port 4 by setting the switch circuit 65 to the first connection state, and operates the converter circuits 71 and 72 as a PFC converter with the input port 4 as the input side, thereby charging the high voltage battery B using the external AC power supply EP connected to the input port 4. In the power supply mode, the control device 8 connects the converter circuits 71 and 72 to the input port 4 and the output port 5, respectively, by setting the switch circuit 65 to the second connection state, and operates the second converter circuit 72 as an inverter with the bulk capacitor 23 as the input side, thereby supplying power to the external AC load EL connected to the output port 5. In addition, the control device 8 can charge the high voltage battery B and supply power to the external AC load EL by setting the switch circuit 65 to the second connection state, operating the first converter circuit 71 as a PFC converter and operating the second converter circuit 72 as an inverter in the charging power supply mode. As described above, according to the power supply system 1, when supplying power and supplying power during charging, only the second converter circuit 72 of the converter circuits 71 and 72 that operate as a PFC converter during charging is operated as an inverter. Therefore, according to the power supply system 1, charging, power supply, and power supply during charging can be performed using the common power converter 6, so compared with the case where charging and power supply are performed using different units, the cost can be reduced, and further, it can contribute to improving energy efficiency.

[0138] (2) According to the power supply system 1, when a request for charging by the external AC power supply EP or for supplying power to the external AC load EL is obtained, the control mode of the control device 8 is determined based on the operating state information of the converter circuits 71, 72 and the type of the obtained request. Thus, according to the power supply system 1, it is possible to switch to an appropriate control mode corresponding to the operating state of the converter circuits 71, 72 when the request is obtained, so that the charging operation or power supply operation performed before the request is obtained can be continued while switching to a new control mode.

[0139] (3) According to the power supply system 1, in the charging power supply mode, the control device 8 controls the voltage of the body capacitor 23 by operating the first converter circuit 71 as a PFC converter, thereby maintaining the voltage of the body capacitor 23 at a voltage specified for simultaneously charging the high-voltage battery B and supplying power to the external AC load EL.

[0140] (4) According to the power supply system 1, in the charging mode, the control device 8 controls the voltage of the bulk capacitor 23 by operating the converter circuits 71 and 72 as PFC converters, thereby maintaining the voltage of the bulk capacitor 23 at a voltage specified for charging the high voltage storage battery B. In addition, according to the power supply system 1, by operating both the converter circuits 71 and 72 as PFC converters, the high voltage storage battery B can be charged more efficiently in a high load region than when only the first converter circuit 71 is operated as a PFC converter.

[0141] (5) According to the power supply system 1, when a power supply start request is received during charging of the high voltage battery B, the control device 8 starts operating the second converter circuit 72, which has been operating as the PFC converter, as an inverter while continuing to operate the first converter circuit 71 as the PFC converter, thereby switching the control mode from the charging mode to the charging power supply mode. As a result, power supply to the external AC load EL can be started without reducing the charging current to the high voltage battery B to zero.

[0142] (6) According to the power supply system 1, when a power supply stop request is received during the period when power is supplied to the external AC load EL while charging the high voltage battery B, the control device 8 starts to operate the second converter circuit 72, which has been operating as an inverter, as a PFC converter while continuing to operate the first converter circuit 71 as a PFC converter, thereby changing the control mode from the charging power supply mode to the charging mode. As a result, the power supply to the external AC load EL can be stopped without reducing the charging current to the high voltage battery B to zero.

[0143] (7) According to the power supply system 1, in the power supply mode, the control device 8 controls the voltage of the bulk capacitor 23 by operating the power converter 6, and converts the DC power in the bulk capacitor 23 into AC power by operating the second converter circuit 72 as an inverter, and supplies it to the external AC load EL. Therefore, according to the power supply system 1, the voltage of the bulk capacitor 23 can be maintained at a voltage specified for supplying power to the external AC load EL.

[0144] (8) According to the power supply system 1, when a charge start request is received during the period of supplying power to the external AC load EL, the control device 8 starts operating the first converter circuit 71, which has been stopped before, 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, the high voltage battery B can be charged while continuing to supply power to the external AC load EL.

[0145] (9) According to the power supply system 1, 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, the control device 8 starts to stop 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, thereby changing the control mode from the charging power supply mode to the power supply mode. As a result, the charging of the high voltage battery B can be stopped while the external AC load EL is being supplied with power.

[0146] 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.

[0147] 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.

[0148] 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 2As 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 power to the external AC load EL while supplying three-phase AC power to the power converter 6. However, in the charging power supply mode, it is possible to supply power to the external AC load EL while supplying single-phase AC power from the external AC power source EP' to the power converter 6 using only the two power lines L1, N1.

[0149] Reference numerals

[0150] V: Vehicle

[0151] 1: Power system

[0152] B: High voltage battery (power storage device)

[0153] 21,22: Power lines

[0154] 23: Body capacitor (capacitor)

[0155] 3: DC-DC converter (voltage converter)

[0156] 4: Input port

[0157] L1, L2, L3, N1: Power lines

[0158] EP, EP': External AC power supply (external power supply)

[0159] EL1, EL2, EL3: voltage line

[0160] EN:Neutral

[0161] 5: Output port

[0162] L4, N2: Power Line

[0163] EL: External AC load (external load)

[0164] 6: Power Converter

[0165] 61: First switch branch

[0166] 62: Second switch branch

[0167] 63: The third switch branch

[0168] 64: Fourth switch branch

[0169] 65: Switching Circuit

[0170] 71: First converter circuit

[0171] 72: Second converter circuit

[0172] 8: Control device

[0173] 81: Charging / power supply request acquisition unit (request acquisition unit)

[0174] 82: Operation status information acquisition unit

[0175] 83: Control mode determination unit

[0176] 84: Switch control unit

[0177] 85: Power converter control unit

[0178] 86: DC-DC converter control unit

Claims

1. A power supply system, characterized in that: have: a voltage converter connected to the power storage device; A power converter connected to the input port and the output port; a capacitor disposed on a power line connecting the voltage converter and the power converter; and A control device for operating the voltage converter and the power converter; 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 operates the voltage converter and the power converter in any one of the following control modes: a charging mode in which the power storage device is charged by an external power source connected to the input port by setting the switch circuit to the first connection state and operating the first and second converter circuits as power factor correction converters with the input port as the input side; A power supply mode in which the switch circuit is set to the second connection state and the second converter circuit is operated as an inverter with the capacitor as an input side to supply power to an external load connected to the output port; and, By setting the switch circuit to the second connection state, operating the first converter circuit as the power factor correction converter and operating the second converter circuit as the inverter, a charging power supply mode is implemented in which power is supplied to the external load while charging the power storage device.

2. The power supply system according to claim 1, comprising: An operation status information acquisition unit, which acquires the operation status information of the first and second converter circuits; a request acquisition unit that acquires a request for charging by the external power source or for supplying power to the external load; and The control mode determination unit determines the control mode based on the operation state information and the type of the request when the request is acquired.

3. The power supply system according to claim 1, wherein: The control device controls the voltage of the capacitor in the charging power supply mode by operating the first converter circuit as the power factor correction converter.

4. The power supply system according to claim 3, wherein: The control device controls the voltage of the capacitor in the charging mode by operating the first and second converter circuits as the power factor correction converters.

5. The power supply system according to claim 4, further comprising a request acquisition unit, the request acquisition unit acquiring a request to start power supply to the external load or a request to start charging by the external power supply, When the power supply start request is obtained during charging of the power storage device, the control device starts operating the second converter circuit as the inverter while continuing to operate the first converter circuit as the power factor correction converter, thereby changing the control mode from the charging mode to the charging power supply mode.

6. The power supply system according to claim 4, further comprising a request acquisition unit configured to acquire a request to stop power supply to the external load or a request to stop charging by the external power supply, When the power supply stop request is obtained while the power storage device is being charged and the external load is being supplied with power, the control device starts to operate the second converter circuit as the power factor correction converter while continuing to operate the first converter circuit as the power factor correction converter, thereby changing the control mode from the charging power supply mode to the charging mode.

7. The power supply system according to claim 3, wherein: In the power supply mode, the control device controls the voltage of the capacitor by operating the voltage converter, and converts the DC power in the capacitor into AC power by operating the second converter circuit as the inverter, and supplies the AC power to the external load.

8. The power supply system according to claim 7, wherein: The power supply system further includes a request acquisition unit that acquires a request to start power supply to the external load and a request to start charging by the external power supply. When the charging start request is obtained during power supply to the external load, the control device starts to operate the first converter circuit as the power factor correction converter while continuing to operate the second converter circuit as the inverter, thereby changing the control mode from the power supply mode to the charging power supply mode.

9. The power supply system according to claim 7, wherein: The power supply system further includes a request acquisition unit that acquires a request to stop power supply to the external load or a request to stop charging by the external power supply. When the charging stop request is received while the power storage device is being charged and the external load is being supplied with power, the control device stops the operation of the first converter circuit while continuing to operate the second converter circuit as the inverter, thereby changing the control mode from the charging power supply mode to the power supply mode.

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