Power supply system and bidirectional power conversion device

Abstract

To provide an electric power supply system equipped with both a V2H system and a V2L system, which is configured so that a transportable power controller can be utilized more effectively.SOLUTION: An electric power supply system, which is configured so that an electric power system is linkably connected to a movable external power supply, is equipped with: a first unit, linked to the electric power system, which comprises a first input / output connector which AC power is inputted to and outputted from; a second unit which comprises a second connector that is attachably and detachably connected to the first input / output connector, a bi-directional AC / DC inverter, a bi-directional DC / DC converter, and a third input / output connector which DC power is inputted to and outputted from; and a safety mechanism for protection against detachment of the second input / output connector from the first input / output connector with the electric power system carrying currents to the second unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric power supply system, and more particularly to an electric power supply system for use in combination with an electric vehicle. [Background technology]

[0002] In recent years, electric vehicles (EVs), plug-in hybrid vehicles (PHVs), plug-in hybrid electric vehicles (PHEVs), and other vehicles that use electricity as their drive source and have built-in storage batteries that can be supplied with power from an external source have become popular.

[0003] In addition, V2H (Vehicle to Home) systems (e.g., Patent Document 1), which connect the drive batteries installed in these vehicles to the electrical systems of facilities such as homes, enabling the supply of power in both directions, and V2L (Vehicle to Load) systems (e.g., Patent Document 2), which enable the supply of power from on-board batteries to general household electrical appliances, are becoming more widespread and demand for them is increasing.

[0004] Furthermore, a power supply system including a portable power conditioner (hereinafter, "power conditioner") applicable to both the above V2H and V2L has also been proposed (for example, Patent Document 3). Specifically, Patent Document 3 discloses that components that are not necessary for a V2L system but are necessary for a V2H system (necessary for connection to a commercial power grid) are arranged in a stationary unit, and a portable power conditioner is used as a power supply device for the V2L system with a minimum configuration, while being connected to the stationary unit and relaying between the vehicle storage battery to configure a V2H system. With such a configuration, it is possible to realize a portable power conversion device that is suitable for carrying while achieving both V2H and V2L. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-122866 A [Patent Document 2] JP 2013-74719 A [Patent Document 3] JP 2020-150737 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technology of Patent Document 3 makes the inverter portable, which has given rise to new problems. For example, there is a risk that the portable unit may be removed from the stationary unit while it is still connected to the commercial power system, which is a safety issue. In addition, V2H devices are usually installed vertically, and the heat dissipation structure is designed based on this assumption. However, when the portable unit is removed and used as a V2L device, the device is installed horizontally (flat) due to its shape, which causes a problem that the heat dissipation structure does not function well. In addition, the portable unit is used as a V2L device only on limited occasions, such as during a disaster, and is generally used as a V2H device. In that case, the AC outlet used when using the unit as a V2L device is wasted, and if there is no opportunity to use the unit as a V2L device, the cost of the AC outlet will be extra.

[0007] The present invention has been made in consideration of the above-described circumstances, and aims to provide technology for solving problems caused by using portable power conditioners in a power supply system that combines a V2H system and a V2L system. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention adopts the following configuration. A power supply system that connects a power grid and a mobile external power source in an interconnectable manner, a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input / output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power output from the rectifier circuit, a third input / output connector through which DC power is input / output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a safety mechanism for preventing the second input / output connector from being detached from the first input / output connector while the second unit is electrically connected to the power system; The power supply system according to the present invention is characterized by comprising:

[0009] Here, the term "predetermined facility" is used to include various types of facilities, such as a detached house, an apartment building, an office building, and a commercial facility. In addition, when one of the first and second transformer circuits step-down the voltage, the other step-up the voltage, and which circuit steps down or steps up the voltage may be determined according to the voltage of the "mobile external power source." With the above configuration, when the second unit (i.e., a portable power conditioner) is removed from the first unit to be used as a V2L device, the risk of removing the first input / output connector while it is energized with the power system can be prevented.

[0010] Here, the safety mechanism may include a switch provided in the power transmission path of the first unit. The switch may be switched on / off manually by an operation unit, or may be automatically switched on / off. With this configuration, it becomes possible to remove the second input / output connector in a state where the power supply to the first input / output connector is cut off and safety is ensured.

[0011] The safety mechanism further includes: a connector cover that covers the first input / output connector of the first unit in an openable and closable manner; a cover open / close detection means for detecting the open / close state of the connector cover and outputting information relating to the open / close state of the connector cover; and a transmission means for transmitting an output signal of the cover open / close detection means to the second unit. The connector cover may further include a control means for controlling the second unit to stop operation when a signal indicating that the connector cover is open is received.

[0012] According to this configuration, when the connector cover is opened in order to connect or disconnect the first input / output connector and the second input / output connector, the operation of the second unit is stopped, i.e., the second unit is no longer in a state in which electricity can be passed, thereby preventing electric shock accidents when connecting or disconnecting the connectors.

[0013] Moreover, the first input / output connector and the second input / output connector are connectors including a power line and a signal line, the signal line is provided with a transmitting section and a receiving section on the second unit side and a folded-back section on the first unit side, and the transmitting section and the receiving section are connected when the first input / output connector and the second input / output connector are coupled to each other, The safety mechanism includes: The signal line and a control means for controlling the second unit to stop operation when the receiving portion cannot receive a signal from the transmitting portion may be included.

[0014] According to this configuration, the operation of the second unit can be quickly stopped, i.e., the second unit can be made unable to supply current, at the time when the second input / output connector is detached from the first input / output connector, thereby preventing the risk of electric shock when the first input / output connector is detached.

[0015] Moreover, the first input / output connector and the second input / output connector are connectors including a power line and a signal line, the first input / output connector or the second input / output connector has a connector pin structure in which a connector pin of the power line is formed longer than a connector pin of the signal line, The safety mechanism may include the connector pin structure.

[0016] With this configuration, when the second input / output connector is removed from the first input / output connector, the signal line is disconnected before the power line, and the operation of the second unit is quickly stopped at that point, i.e., the second unit is no longer in a state in which electricity can be passed through it, thereby preventing the risk of electric shock when the first input / output connector is removed.

[0017] The power supply system may further include a fourth input / output connector detachably connected to the second input / output connector of the second unit, and a power connection device including a power terminal capable of outputting at least the power input from the fourth input / output connector. The power terminal of the power connection device may be an AC 100V outlet.

[0018] In order to use the second unit as a V2L device by removing it from the first unit, an AC outlet for connecting a load is required. However, when the second unit is connected to the first unit and used as a V2H device, the AC outlet is not used and becomes a wasteful configuration. In general, the scenarios in which the second unit is expected to be used as a V2L device are limited, and the cost of the AC outlet is extra for users who wish to use the second unit as a V2H device. In this respect, with the above-mentioned configuration, the second unit can be configured to eliminate the AC outlet, thereby reducing the cost, and users who wish to use the second unit as a V2L device can use the second unit as a V2L device by separately preparing the power connection device. The power terminal of the power connection device does not necessarily have to be an AC outlet, and may be a USB terminal capable of supplying power, or the like.

[0019] The second unit may further include a heat dissipation fan. V2H devices are generally installed vertically, and the heat dissipation structure is based on this assumption. However, when the portable power transmission device is removed and used as a V2L device, it is usually installed horizontally (flat) due to its shape, which causes a problem that the heat dissipation structure described above does not function well. In this regard, with the above-mentioned configuration, the second unit can be air-cooled by the heat dissipation fan, and the problem of poor heat dissipation caused by placing it horizontally can be improved.

[0020] The heat dissipation fan may be detachably provided in the second unit. In this case, the power source may be a storage battery of an electric vehicle as a power source for starting the V2L device, so that the power source may be a plug that can supply power from a cigarette lighter socket.

[0021] The movable external power source may be a storage battery of an electric vehicle, and the second input / output connector may be configured to be connectable to a charge / discharge terminal of the electric vehicle. Here, electric vehicles include EVs, PHVs, PHEVs, etc. With this configuration, the present invention provides a V2H and V2 It is preferable that L be used as a multipurpose device.

[0022] The present invention also provides a power supply system that connects a power grid and a mobile external power source in an interconnectable manner, comprising: a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input / output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power output from the rectifier circuit, a third input / output connector through which DC power is input / output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; It can also be understood as a power supply system having a fourth input / output connector that is detachably connected to the second input / output connector of the second unit, and a power connection device that has a power terminal capable of outputting at least the power input from the fourth input / output connector.

[0023] The present invention also provides a power supply system that connects a power grid and a mobile external power source in an interconnectable manner, comprising: a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input and output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power, a third input / output connector through which DC power is input and output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; It can also be regarded as a power supply system having a third unit including a fan for dissipating heat from the second unit and a power input section connected to the movable external power source.

[0024] The present invention also provides an electric circuit including an AC input / output connector for inputting and outputting AC power, a rectifier circuit for converting the AC power input from the AC input / output connector into DC power, a first transformer circuit for transforming the DC power output from the rectifier circuit, a DC input / output connector for inputting and outputting DC power, a second transformer circuit for transforming the DC power input from the DC input / output connector, and an inverse conversion circuit for converting the DC power output from the second transformer circuit into AC power; and a control unit that controls the electric circuit so as to be connectable to a commercial power system, and the bidirectional power conversion device that constitutes the above-mentioned second unit.

[0025] The present invention can be achieved by combining the above-described configurations and processes as long as no technical contradiction occurs. Effect of the Invention

[0026] According to the present invention, it is possible to provide a technique for solving problems caused by using a portable power transmission device in a power supply system that combines a V2H system and a V2L system. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a block diagram showing an outline of a power supply system according to a first embodiment of the present invention. [Diagram 2] Fig. 2A is a schematic diagram showing a front view of a fixing unit and a power conditioner according to the first embodiment of the present invention, and Fig. 2B is a schematic diagram showing a side view of the fixing unit and the power conditioner according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a block diagram showing an outline of a power supply system according to a modified example of the first embodiment. [Figure 4] FIG. 4 is a block diagram showing an outline of a power supply system according to another modified example of the first embodiment. [Diagram 5]Fig. 5A is a first explanatory diagram showing the structure of the power line and the signal line of the connector, Fig. 5B is a second explanatory diagram showing the structure of the power line and the signal line of the connector, and Fig. 5C is a third explanatory diagram showing the structure of the power line and the signal line of the connector. [Figure 6] FIG. 6 is a block diagram showing an outline of a power supply system according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a block diagram showing an outline of a power supply system according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] <Application Examples> Hereinafter, application examples of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing an outline of a power supply system 1 to which the present invention can be applied. In Fig. 1, solid lines connecting each block indicate connections of power lines, and dashed lines connecting each block indicate connections of signal lines (including wireless communication).

[0029] As shown in FIG. 1, the power supply system 1 according to this application example includes a fixed unit 110 connected to an electrical circuit of a facility interconnected with a power grid 150, a portable power conditioner 120 detachably connected to the fixed unit 110, and a storage battery 131 mounted on an electric vehicle 130 such as an EV that uses electric power as a driving force.

[0030] The fixed unit 110 includes a facility-side connection part 111 that connects to a distribution board 140 of the facility, a fixed-side connector 112 that functions as a connection part with the power conditioner 120, and a switch 113 provided between the facility-side connection part 111 and the fixed-side connector 112. In this application example, the fixed unit 110 corresponds to a first unit.

[0031] The power conditioner 120 also includes a movable side AC connector 121 detachably connectable to the fixed side connector 112 of the fixed unit 110, a bidirectional DC / AC inverter 123, a bidirectional DC / DC converter 124, and a movable side DC connector 122 connected to the electric vehicle 130. In this application example, the power conditioner 120 corresponds to the second unit. The electric vehicle 130 also includes an EV connector 132 detachably connectable to the power conditioner 120.

[0032] The facility-side connection unit 111 of the fixed unit 110 receives AC power from the power system 150 via the distribution board 140, and outputs AC power supplied from the power conditioner 120 via the fixed-side connector 112. The fixed-side connector 112 receives AC power from the storage battery 131 of the electric vehicle 130 via the power conditioner 120, and outputs AC power supplied from the facility-side connection unit 111. That is, in this application example, the storage battery 131 corresponds to a movable external power source. The switch 113 is a switch provided in a power circuit C that connects the facility-side connection unit 111 and the fixed-side connector 112, and turns the circuit ON / OFF manually or automatically.

[0033] The movable-side AC connector 121 of the power conditioner 120 receives AC power from the fixed unit 110 via the fixed-side connector 112, and outputs power that has been converted to AC by a bidirectional DC / AC inverter 123, as described below. The movable-side DC connector 122 receives DC power from a storage battery 131 of the electric vehicle 130 via an EV connector 132, and outputs DC power that has been stepped down by a bidirectional DC / DC converter 124, as described below.

[0034] Moreover, the bidirectional DC / AC inverter 123 is a bidirectional forward / reverse conversion circuit, which converts AC power inputted from the movable side AC connector 121 into DC power and outputs it, and also converts DC power inputted from the movable side DC connector 122 and boosted (or stepped down) by the bidirectional DC / DC converter 124 as described later into AC power and outputs it. That is, in this application example, the bidirectional DC / AC inverter 123 corresponds to a rectifier circuit and an inverse conversion circuit. Note that the bidirectional DC / AC inverter 123 may employ any known technology, and detailed description such as an electrical circuit diagram will be omitted.

[0035] Moreover, the bidirectional DC / DC converter 124 is a bidirectional transformer circuit, which steps down (or steps up) the power converted to DC by the bidirectional DC / AC inverter 123 and outputs it, and steps up (or steps down) the power input from the movable-side DC connector 122 and outputs it. That is, in this application example, the DC / DC converter 124 corresponds to the first transformer circuit and the second transformer circuit. Note that the bidirectional DC / DC converter 124 may employ any known technology, and detailed explanations such as an electrical circuit diagram will be omitted.

[0036] The EV connector 132 of the electric vehicle 130 is a connector that complies with an electric vehicle charging standard such as CHAdeMO and is configured to be connectable to a terminal of the storage battery 131, and the connection terminal is configured to enable bidirectional power supply. By connecting to the storage battery 131 via the EV connector 132, it becomes possible to supply power from the power conditioner 120 to the storage battery 131, and also to supply power from the storage battery 131 to the power conditioner 120.

[0037] In the power supply system 1 according to this application example, the fixed connector 112 and the movable AC connector 121 are normally connected, and the inverter 120 is attached to the fixed unit 110 and functions as a V2H device. When the inverter 120 is used as a V2L device, it can be removed to any location by removing the movable AC connector 121 from the fixed connector 112. At this time, by turning off the switch 113 of the fixed unit 110, it is possible to cut off power from the power system 150 and perform the removal work safely. That is, in this application example, the switch 113 corresponds to a safety device.

[0038] <Embodiment 1> (Overall system configuration) Hereinafter, the embodiments of the present invention will be described in more detail with reference to the drawings. FIGS. 1 and 2 are diagrams relating to the first embodiment of the present invention. Since this embodiment has the same system configuration as that described in the application example, the same reference numerals as those in the application example are used, and detailed description of the configuration already described in the application example will be omitted. FIG. 1 is a block diagram showing a schematic configuration of a power supply system 1 of this embodiment. As described above, the power supply system 1 includes a fixed unit 110 connected to an electric circuit of a facility interconnected with a power system 150, a portable power conditioner 120 detachably connected to the fixed unit 110, and a storage battery 131 mounted on an electric vehicle 130 such as an EV that uses electric power as a driving force.

[0039] FIG. 2 is a schematic diagram for explaining the external appearance of the fixed unit 110 and the inverter 120 in the power supply system 1 of this embodiment. FIG. 2A is a schematic diagram for explaining the external appearance of the fixed unit 110 and the inverter 120 in the power supply system 1 of this embodiment. 2A shows a front view of fixed unit 110 and inverter 120, and FIG. 2B shows a side view of fixed unit 110 and inverter 120.

[0040] As shown in Fig. 2, the fixed unit 110 includes a housing having the inverter support part 11, a fixed connector 112, and a switch operation button 13. In addition, as shown in Fig. 1, the fixed unit 110 includes a facility-side connection part 111 and a switch 113, and the switch 113 can be manually switched ON / OFF by operating the switch operation button 13. Although not shown, the fixed unit 110 has a structure (such as an engagement metal fitting) on ​​the back side that allows it to be fixed to a wall surface of a facility such as a house, and the facility-side connection part 111 and the power system 150 are connected via a distribution board 140 of the facility. The fixed unit 110 can also be installed and fixed on the ground, a pedestal, or the like, and in this case, legs, a pedestal fixing member, or the like may be provided on the bottom of the inverter support part 11.

[0041] 2, the power conditioner 120 includes a housing 21, a handle 22, a movable side AC connector 121 (and a cable), a movable side DC connector 122 (and a cable), an operation unit 126, a display unit 127, and an output terminal 128. Also, as shown in FIG. 1, the power conditioner 120 includes a bidirectional DC / AC inverter 123, a bidirectional DC / DC converter 124, and a control circuit 125.

[0042] The handle 22 is provided integrally with the housing 21 and functions as a handle when the inverter 120 is separated from the fixed unit 110 and transported. The handle 22 is not an essential component, and there is no problem even if the handle 22 is not provided as long as it does not hinder portability. The movable side AC connector 121, the movable side DC connector 122, the bidirectional DC / AC inverter 123, and the bidirectional DC / DC converter 124 have already been described, and will not be described again. The operation unit 126 has a plurality of operation buttons and has a function of receiving user input via the operation buttons and transmitting it to the control circuit 125 described below. The display unit 127 is, for example, a liquid crystal display or an LED lamp, and has a function of displaying information such as the operating state of the inverter 120 and responses to user operations.

[0043] The control circuit 125 includes a CPU (Central Processing Unit) and controls each part of the power conditioner 120. The control circuit 125 senses the current and voltage in the movable AC connector 121, the movable DC connector 122, the bidirectional DC / AC inverter 123, and the bidirectional DC / DC converter 124, and executes control necessary for system interconnection with the power system 150, such as suppressing the output from the storage battery 131 as necessary. The circuit configuration may employ any known technology constructed to satisfy requirements in accordance with the "Guidelines for Technical Requirements for System Interconnection Related to Ensuring Power Quality" established by the Agency for Natural Resources and Energy, and detailed description thereof will be omitted.

[0044] The output terminal 128 is provided in the housing 21 as, for example, a typical household AC 100V outlet, and is configured to be able to supply power to an external load by connecting an attachment plug of the external load. That is, when the power conditioner 120 is used as a V2L device, power can be supplied to an external load via the output terminal 128.

[0045] According to the power supply system 1 configured as above, a V2H system can be realized when the fixed side connector 112 of the fixed unit 110 is connected to the movable side AC connector 121 of the power conditioner 120, and the EV connector 132 of the electric vehicle 130 is connected to the movable side DC connector 122 of the power conditioner 120. Furthermore, by disconnecting the fixed side connector 112 and the movable side AC connector 121, it is possible to realize a V2L system that uses the storage battery 131 of the electric vehicle 130 as a power source.

[0046] When removing the fixed side connector 112 and the movable side AC connector 121 to use the inverter 120 as a V2L device, the worker first operates the switch operation button 13 on the fixed unit 110 to turn off the switch 113, thereby cutting off power from the power grid 150 and allowing the removal work to be performed safely.

[0047] (Variation 1) In the above-mentioned embodiment 1, the switch 113 corresponds to the safety mechanism, but other safety mechanisms can be adopted instead of or in addition to the switch 113. Such modified examples will be described below with reference to the drawings. However, in the following, the same components as those in the power supply system 1 according to embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0048] 3 is a block diagram showing a schematic configuration of a power supply system 2 according to a first modified example of the power supply system 1. The power supply system 2 according to this modified example differs from the power supply system 1 of the first embodiment only in that the fixed unit 210 includes a connector cover 211 and a cover open / close sensor 212, and other configurations are the same as those of the power supply system 1.

[0049] The connector cover 211 is a member that covers the fixed side connector 112 of the fixed unit 110, and is provided on the housing of the fixed unit 110 so as to be freely opened and closed by a hinge or the like. The connector cover 211 is provided with an opening for a cable extending from the movable side AC connector 121, and the connector cover 211 can be closed to cover the fixed side connector 112 while the movable side AC connector 121 and the fixed side connector 112 are coupled.

[0050] The cover open / close sensor 212 detects whether the connector cover 211 is open or closed, and transmits that state to the control circuit 125 of the inverter 120. Then, when the control circuit 125 receives a signal from the cover open / close sensor 212 indicating that the connector cover 211 is "open" while the inverter 120 is operating and the switch 113 is not turned OFF (i.e., the fixed unit 210 and the inverter 120 are electrically connected), the control circuit 125 immediately performs control to stop the operation of the inverter 120. That is, in this modification, the cover open / close sensor 212 corresponds to the cover open / close detection means and the transmission means, and the control circuit 125 corresponds to the control means.

[0051] This prevents an operator from accidentally disconnecting the fixed side connector 112 and the movable side AC connector 121 while the fixed unit 210 and the inverter 120 are still electrically connected, thereby preventing electric shock accidents.

[0052] (Variation 2) 4 is a block diagram showing a schematic configuration of a power supply system 3 according to a second modified example of the power supply system 1. The power supply system 3 according to this modified example differs from the power supply system 1 of the first embodiment in that a signal line for detecting the connection state of the connector is provided.

[0053] Specifically, a control circuit 325 of the inverter 320 is provided with a connection detection signal transmitter 321 and a connection detection signal receiver 322, and a signal line connected to these is connected to the movable-side AC connector 121. Meanwhile, the fixed-side unit 110 is provided with a signal line whose both ends are connected to the fixed-side connector 112 and which is folded back within the fixed unit 110. When the fixed-side connector 112 and the movable-side AC connector 121 are coupled together, the signal lines of these connectors are also connected, and the signal transmitted from the connection detection signal transmitter 321 is received by the connection detection signal receiver 322.

[0054] Here, in this modified example, the fixed side connector 112 and the movable side AC connector 121 are The force lines and signal lines have a connector pin structure in which the connector pins of the power lines are longer than the connector pins of the signal lines. Figure 5 is a schematic diagram showing the connector pin structure, with Figure 5A showing a state in which the fixed side connector 112 and the movable side AC connector 121 are detached, Figure 5C showing a state in which these two connectors are connected, and Figure 5B showing an intermediate state.

[0055] Due to the connector pin structure of this modified example in which the connector pin E1 of the power line E is formed longer than the connector pin S1 of the signal line S, even when the power line D is connected as shown in Figure 5B, a state in which the signal line S becomes disconnected, i.e., a state in which the connection detection signal receiving unit 322 is unable to receive the signal transmitted from the connection detection signal transmitting unit 321, can occur.

[0056] Then, when the connection detection signal receiving unit 322 is unable to receive the signal transmitted from the connection detection signal transmitting unit 321 while the inverter 320 is operating and the switch 113 is not turned OFF (i.e., the fixed unit 110 and the inverter 320 are electrically connected), the control circuit 325 immediately performs control to stop the operation of the inverter 320. That is, in this modified example, the control circuit 325 corresponds to the control means.

[0057] As a result, even if an operator accidentally removes the fixed side connector 112 and the movable side AC connector 121 while the fixed unit 110 and the inverter 320 are still electrically connected, the operation of the inverter 320 can be stopped to prevent an electric shock accident.

[0058] <Embodiment 2> The present invention can also be applied to power supply systems other than those of the above-mentioned embodiment 1. Fig. 6 is a block diagram showing a schematic configuration of a power supply system 4 according to another embodiment of the present invention. Power supply system 4 differs from power supply system 1 in that power conditioner 420 does not have output terminal 128, but has outlet box 400 connectable to movable AC connector 121 of power conditioner 420.

[0059] The outlet box 400 is a portable device that includes an outlet box connector 401 that is detachably connected to the movable AC connector 121, and an output terminal 402 that serves as an AC 100V outlet. That is, in this embodiment, the outlet box 400 corresponds to a power connection device.

[0060] In this embodiment, the inverter 420 body is not provided with an output terminal for an external load, so the inverter 420 cannot be used as a V2L device as is. However, by connecting the outlet box connector 401 to the movable AC connector 121 removed from the fixed connector 112, the output terminal 402 of the outlet box 400 can be used as an output terminal for an external load.

[0061] Generally, V2L is expected to be used in limited situations such as during disasters, so for users who wish to introduce a power supply system as V2H, the cost of the output terminals is extra. In this regard, with a configuration like the power supply system 4 of this embodiment, the output terminal for the external load is eliminated from the power conditioner 420, reducing the cost, and users who wish to use it as a V2L device can use it as a V2L device by preparing a separate outlet box 400.

[0062] <Embodiment 3> 7 is a block diagram showing a schematic configuration of a power supply system 5 according to still another embodiment of the present invention. Power supply system 5 differs from power supply system 1 in that power supply system 5 includes a heat dissipation fan device 511 that is detachably provided in inverter 120.

[0063] The heat dissipation fan device 511 includes a fan (not shown) and a power supply unit 512. The power supply unit 512 is a power input terminal configured to allow power to be supplied from the outside, and can be connected to, for example, a power supply cable connectable to the cigarette lighter socket 133 of the electric automobile 130.

[0064] 2, when the inverter 120 is used as a V2H device by connecting it to the fixed unit 110, it is installed vertically with the handle 22 facing upward, and the heat dissipation structure (not shown) of the inverter 120 is designed based on this assumption. However, when the inverter 120 is removed from the fixed unit 110 and used as a V2L device, due to its shape, it is usually installed flat (horizontally) with the front part of the housing 21 facing upward, which creates a problem that the heat dissipation structure described above does not function well. In this regard, with a configuration like that of the power supply system 5, the inverter 120 can be forcibly air-cooled by attaching a heat dissipation fan device 511, which improves the problem of poor heat dissipation caused by placing it flat.

[0065] In addition, by making it possible for the heat dissipation fan device 511 to be connected to the cigarette lighter socket 133 of the electric vehicle 130 and receiving power from the storage battery 131, it becomes possible to secure power to drive the heat dissipation fan device 511 even in situations where it is difficult to secure power, such as during disasters.

[0066] <Other> The above-mentioned embodiments merely exemplify the present invention, and the present invention is not limited to the above-mentioned specific embodiments. The present invention can be modified in various ways within the scope of its technical concept. For example, the configuration of the modified example 1 of the above-mentioned embodiment 1 can be used in combination with the modified example 2. Furthermore, instead of providing a signal line dedicated to the connector connection detection signal as in the modified example 2, a connector pin structure in which the connector pin of the power line is formed longer than the connector pin of the signal line may be used to stop the power conditioner when a state in which power is ON and (some) signal is OFF is detected. In addition, each modified example of the embodiment 1 can be combined with the embodiment 2 or 3 to form a power supply system.

[0067] In addition, in the third embodiment, the heat dissipation fan device 511 is configured to be detachable from the inverter 120, but it is also possible to configure the inverter 120 to have a built-in heat dissipation fan and to have a dedicated intake and exhaust port.

[0068] In addition, in each of the above examples, an AC 100V outlet is used as the output terminal, but this is not limited to this, and the inverter can be provided with any desired output terminal, such as a USB terminal. Furthermore, an input / output terminal that can input power as well as output power may be provided.

[0069] Furthermore, the power supply system of each of the above examples can be operated in cooperation with another smart grid system such as a Home Energy Management System (HEMS), or as a part of the system.

[0070] <Appendix 1> A power supply system (1) that interconnects a power grid (150) and a mobile external power source (131), a first unit (110) including a facility side connection part (111) connected to a power input / output part (140) of a predetermined facility interconnected with the power system, a first input / output connector (112) through which AC power is input / output, and a power transmission line (C) connecting the facility side connection part and the first input / output connector; a second unit (120) including a second input / output connector (121) detachably connected to the first input / output connector and through which AC power is input / output, a rectifier circuit (123) that converts the AC power input from the second input / output connector into DC power, a first transformer circuit (124) that transforms the DC power output from the rectifier circuit, a third input / output connector (122) through which DC power is input / output, a second transformer circuit (124) that transforms the DC power input from the third input / output connector, and an inverter circuit (123) that converts the DC power output from the second transformer circuit into AC power; a safety mechanism (113) for preventing the second input / output connector from being detached from the first input / output connector while the second unit is electrically connected to the power system; A power supply system comprising: [Explanation of symbols]

[0071] 1, 2, 3, 4, 5... Power supply system 110, 210... Fixed unit 111 Facility side connection 112 Fixed side connector 113···Switch 11 Power conditioner support 13 Switch operation button 211···Connector cover 212···Cover opening / closing sensor 120, 320, 420...Power conditioner 121···Movable side AC connector 122···Movable side DC connector 123 Bidirectional DC / AC Inverter 124...Bidirectional DC / DC Converter 125, 325... Control circuit 126...Operation unit 127...Display section 128, 402... Output terminal 21... Enclosure 22 Handle 321 Connection detection signal transmitter 322 Connection detection signal receiver 130...Electric vehicle 131... Battery 132···EV Connector 133···Cigarette lighter socket 140 Distribution board 150...Electric power system 400···Outlet box 401···Outlet box connector 511...Heat dissipation fan device 512... Power supply unit C...Power circuit

Claims

1. A power supply system that connects a power grid and a mobile external power source in an interconnectable manner, a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input / output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power output from the rectifier circuit, a third input / output connector through which DC power is input / output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a safety mechanism for preventing the second input / output connector from being detached from the first input / output connector while the second unit is electrically connected to the power system; A power supply system comprising:

2. The safety mechanism includes: A switch is provided in the power transmission path of the first unit.

2. The power supply system according to claim 1 .

3. The safety mechanism includes: a connector cover that covers the first input / output connector of the first unit in an openable and closable manner; a cover open / close detection means for detecting whether the connector cover is open or closed and outputting information relating to the open / closed state of the connector cover; a transmitting means for transmitting an output signal of the cover opening / closing detection means to the second unit; and a control means for controlling the second unit to stop operation when a signal indicating that the connector cover is in an open state is received.

3. The power supply system according to claim 1 or 2.

4. the first input / output connector and the second input / output connector are connectors including a power line and a signal line, the signal line is provided with a transmitting section and a receiving section on the second unit side and a folded-back section on the first unit side, and the transmitting section and the receiving section are connected when the first input / output connector and the second input / output connector are coupled to each other, The safety mechanism includes: The signal line and a control means for controlling the second unit to stop operation when the receiving unit cannot receive a signal from the transmitting unit.

4. The power supply system according to claim 1, wherein the power supply system comprises:

5. the first input / output connector and the second input / output connector are connectors including a power line and a signal line, the first input / output connector or the second input / output connector has a connector pin structure in which a connector pin of the power line is formed longer than a connector pin of the signal line, The safety mechanism includes the connector pin structure.

5. The power supply system according to claim 1, wherein the power supply system comprises:

6. a fourth input / output connector detachably connected to the second input / output connector of the second unit, and a power connection device including a power terminal capable of outputting at least the power input from the fourth input / output connector; 6. The power supply system according to claim 1, wherein the power supply system is a power supply unit.

7. 7. The power supply system according to claim 6, wherein the power terminal of the power connection device is an AC 100V outlet.

8. The power supply system according to claim 1 , wherein the second unit further comprises a heat dissipation fan.

9. 9. The power supply system according to claim 8, wherein the heat dissipation fan is detachably provided on the second unit.

10. A power supply system that connects a power grid and a mobile external power source in an interconnectable manner, a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input / output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power output from the rectifier circuit, a third input / output connector through which DC power is input / output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a fourth input / output connector detachably connected to the second input / output connector of the second unit; and a power connection device including a power terminal capable of outputting at least the power input from the fourth input / output connector; A power supply system comprising:

11. A power supply system that connects a power grid and a mobile external power source in an interconnectable manner, a first unit including a facility-side connection portion connected to a power input / output portion of a predetermined facility interconnected with the power system, a first input / output connector through which AC power is input / output, and a power transmission line connecting the facility-side connection portion and the first input / output connector; a second unit including a second input / output connector detachably connected to the first input / output connector and through which AC power is input and output, a rectifier circuit that converts the AC power input from the second input / output connector into DC power, a first transformer circuit that transforms the DC power, a third input / output connector through which DC power is input and output, a second transformer circuit that transforms the DC power input from the third input / output connector, and an inverter circuit that converts the DC power output from the second transformer circuit into AC power; a third unit including a fan for dissipating heat from the second unit and a power input unit connected to the movable external power source; A power supply system comprising:

12. The mobile external power source is a storage battery of an electric vehicle, and the third input / output connector is configured to be connectable to a charging / discharging terminal of the electric vehicle.

12. A power supply system according to any one of claims 1 to 11.

13. an electric circuit including: an AC input / output connector for inputting and outputting AC power; a rectifier circuit for converting the AC power input from the AC input / output connector into DC power; a first transformer circuit for transforming the DC power output from the rectifier circuit; a DC input / output connector for inputting and outputting DC power; a second transformer circuit for transforming the DC power input from the DC input / output connector; and an inverse conversion circuit for converting the DC power output from the second transformer circuit into AC power; A control unit that controls the electric circuit so as to be connectable to a commercial power system, A bidirectional power conversion device constituting the second unit according to claim 1 .

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