JP7622475B2 - Power supply system and bidirectional power conversion device - Google Patents

Description

The present invention relates to a power supply system, and in particular to a power supply system used in combination with an electric vehicle.

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

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 houses, 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.

Furthermore, a power supply system equipped with a portable power conditioner (hereinafter, "power conditioner") that can be applied 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 around while achieving both V2H and V2L.

JP 2015-122866 A JP 2013-74719 A JP 2020-150737 A

However, the technology of Patent Document 3 makes the inverter portable, which has given rise to new problems. For example, there is a risk of the portable unit being removed from the stationary unit while still connected to the commercial power grid, which is a safety issue. In addition, V2H devices are usually installed vertically, and the heat dissipation structure is designed with this in mind, but when the portable unit is removed and used as a V2L device, the shape of the device means that it must be installed horizontally (flat), which creates a problem of the heat dissipation structure not working properly. In addition, the portable unit is used as a V2L device only on limited occasions, such as during disasters, and is generally used as a V2H device. In that case, the AC outlet used when using it as a V2L device goes to waste, and if there is no opportunity to use it as a V2L device, the cost of the AC outlet will be extra.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide technology to solve problems caused by using portable inverters in a power supply system that combines a V2H system and a V2L system.

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:

The term "prescribed facility" is used here to include various types of facilities, such as detached houses, apartment buildings, office buildings, and commercial facilities. In addition, when 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 can be determined according to the voltage of the "mobile external power source." This configuration can prevent the risk of removing the first input/output connector while it is energized with the power system when removing the second unit (i.e., a portable power conditioner) from the first unit to use it as a V2L device.

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

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.

With this configuration, in order to connect and disconnect the first input/output connector and the second input/output connector, the operation of the second unit can be stopped, i.e., it can no longer be in a state in which electricity can be passed, at the time the connector cover is opened. This makes it possible to prevent electric shock accidents when connecting and disconnecting the connectors.

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.

With this configuration, the operation of the second unit can be quickly stopped, i.e., it can no longer be energized, when the second input/output connector is removed from the first input/output connector. This makes it possible to prevent electric shock accidents when the first input/output connector is removed.

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.

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 at that point the operation of the second unit is quickly stopped, i.e., it is no longer in a state in which electricity can be passed. This makes it possible to prevent electric shock accidents when the first input/output connector is removed.

The power supply system may further include 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 includes a power terminal that can output power input from at least the fourth input/output connector. The power terminal of the power connection device may be an AC 100V outlet.

In order to remove the second unit from the first unit and use it as a V2L device, an AC outlet to connect 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 it is expected to be used as a V2L device are limited, and for users who wish to use it as a V2H device, the cost of the AC outlet is extra. In this regard, with the above configuration, the second unit can be configured to eliminate the AC outlet, thereby reducing costs, and users who wish to use it as a V2L device can use it as a V2L device by separately preparing the power connection device. Note that the power terminal of the power connection device does not necessarily have to be an AC outlet, and may be a USB terminal that can supply power, etc.

The second unit may further include a heat dissipation fan. V2H equipment is 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 (laid flat) due to its shape, which creates a problem that the heat dissipation structure described above does not function properly. In this regard, with the above-mentioned configuration, the second unit can be air-cooled by the heat dissipation fan, improving the problem of poor heat dissipation caused by placing it horizontally.

The heat dissipation fan may be detachably attached to 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 the device may be equipped with a plug that can supply power from a cigarette lighter socket.

The movable external power source may be a 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 the L be used as a multipurpose device.

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.

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.

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.

The above configurations and processes can be combined with each other to form the present invention as long as no technical contradictions arise.

The present invention provides technology to solve problems caused by using portable power transmission devices in a power supply system that combines a V2H system and a V2L system.

FIG. 1 is a block diagram showing an outline of a power supply system according to a first embodiment of the present invention. 2A and 2B are schematic diagrams showing a front view and a side view of the fixing unit and the inverter of the first embodiment of the present invention, respectively. FIG. 3 is a block diagram showing an outline of a power supply system according to a modified example of the first embodiment. FIG. 4 is a block diagram showing an outline of a power supply system according to another modified example of the first embodiment. Fig. 5A is a first explanatory diagram showing the structure of the power line and the signal line of the connector portion, Fig. 5B is a second explanatory diagram showing the structure of the power line and the signal line of the connector portion, and Fig. 5C is a third explanatory diagram showing the structure of the power line and the signal line of the connector portion. FIG. 6 is a block diagram showing an outline of a power supply system according to a second embodiment of the present invention. FIG. 7 is a block diagram showing an outline of a power supply system according to a third embodiment of the present invention.

<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).

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 that is interconnected with a power grid 150, a portable power conditioner 120 that is 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.

The fixed unit 110 includes a facility-side connection part 111 that connects to the 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 that is provided between the facility-side connection part 111 and the fixed-side connector 112. In this application example, the fixed unit 110 corresponds to the first unit.

The power conditioner 120 also includes a movable AC connector 121 that can be detachably connected to the fixed connector 112 of the fixed unit 110, a bidirectional DC/AC inverter 123, a bidirectional DC/DC converter 124, and a movable DC connector 122 that is 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 that can be detachably connected to the power conditioner 120.

The facility side connection part 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 also 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 part 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 the power circuit C that connects the facility side connection part 111 and the fixed side connector 112, and manually or automatically turns the circuit ON/OFF.

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 the storage battery 131 of the electric vehicle 130 via the EV connector 132, and outputs DC power that has been stepped down by a bidirectional DC/DC converter 124, as described below.

The bidirectional DC/AC inverter 123 is a bidirectional forward/reverse conversion circuit that converts AC power input from the movable side AC connector 121 into DC power and outputs it, and also converts DC power input from the movable side DC connector 122 and boosted (or stepped down) by the bidirectional DC/DC converter 124 as described below 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 can be made using any known technology, and detailed explanations such as electrical circuit diagrams will be omitted.

The bidirectional DC/DC converter 124 is a bidirectional transformer circuit that 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 can be made using any known technology, and detailed explanations such as electrical circuit diagrams will be omitted.

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 the terminals of the storage battery 131, and the connection terminals are configured to allow for 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.

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 grid 150 and perform the removal work safely. That is, in this application example, the switch 113 corresponds to a safety device.

<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.

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 the present 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 the present embodiment.
2A shows a front view of the fixed unit 110 and the inverter 120, and FIG. 2B shows a side view of the fixed unit 110 and the inverter 120.

As shown in FIG. 2, the fixed unit 110 includes a housing with a power conditioner support 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 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 the wall of a facility such as a house, and the facility side connection 111 and the power system 150 are connected via the distribution board 140 of the facility. The fixed unit 110 can also be installed and fixed on the ground, a pedestal, etc., and in this case, legs, a pedestal fixing member, etc. may be provided at the bottom of the power conditioner support 11.

2, the power conditioner 120 includes a housing 21, a handle 22, a movable AC connector 121 (and cable), a movable DC connector 122 (and cable), an operation unit 126, a display unit 127, and an output terminal 128. 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.

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 if the handle 22 is not provided as long as it does not interfere with transportation. The movable AC connector 121, the movable 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 multiple operation buttons and has the function of accepting user input via the operation buttons and transmitting it to the control circuit 125 described below. The display unit 127 is composed of, for example, an LCD display or LED lamps, and has the function of displaying information such as the operating state of the inverter 120 and responses to user operations.

The control circuit 125 includes a CPU (Central Processing Unit) and controls each part of the power conditioner 120. The control circuit 125 also 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 performs the control required for system interconnection with the power grid 150, such as suppressing the output from the storage battery 131 as necessary. The circuit configuration may employ any known technology constructed to meet the requirements in accordance with the "Guidelines for System Interconnection Technical Requirements for Ensuring Power Quality" established by the Agency for Natural Resources and Energy, and a detailed description thereof will be omitted.

The output terminal 128 is provided on 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 the plug of the external load. In other words, when the power conditioner 120 is used as a V2L device, power can be supplied to an external load via the output terminal 128.

With the power supply system 1 configured as described 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.

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

(Variation 1)
In the above-described first embodiment, the switch 113 corresponds to the safety mechanism, but other safety mechanisms may 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 the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

Figure 3 is a block diagram showing the 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 according to the first embodiment only in that the fixed unit 210 includes a connector cover 211 and a cover open/close sensor 212, and the rest of the configuration is the same as that of the power supply system 1.

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 that it can be opened and closed freely using a hinge or the like. The connector cover 211 has 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 connected.

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. If 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 in operation and the switch 113 is not turned off (i.e., the fixed unit 210 and the inverter 120 are in an electrically conductive state), the control circuit 125 immediately controls the inverter 120 to stop operation. That is, in this modified example, the cover open/close sensor 212 corresponds to the cover open/close detection means and transmission means, and the control circuit 125 corresponds to the control means.

This prevents an operator from accidentally removing 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.

(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.

Specifically, the control circuit 325 of the inverter 320 is provided with a connection detection signal transmitter 321 and a connection detection signal receiver 322, and the signal lines connected to these are connected to the movable AC connector 121. On the other hand, the fixed unit 110 is provided with a signal line whose both ends are connected to the fixed connector 112 and which is folded back within the fixed unit 110. When the fixed connector 112 and the movable AC connector 121 are connected, 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.

In this modified example, the power lines and signal lines of the fixed connector 112 and the movable AC connector 121 have a connector pin structure in which the connector pins of the power lines are longer than the connector pins of the signal lines. Fig. 5 is a schematic diagram showing the connector pin structure, with Fig. 5A showing a state in which the fixed connector 112 and the movable AC connector 121 are detached, Fig. 5C showing a state in which these two connectors are connected, and Fig. 5B showing an intermediate state between them.

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

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 in operation and the switch 113 is not turned off (i.e., the fixed unit 110 and the inverter 320 are in an electrically conductive state), 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.

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 energized, the inverter 320 can be stopped from operating, thereby preventing an electric shock accident.

<Embodiment 2>
The present invention can also be applied to power supply systems other than those of the above-described 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. The power supply system 4 differs from the power supply system 1 in that the inverter 420 does not have an output terminal 128, but has an outlet box 400 that can be connected to the movable AC connector 121 of the inverter 420.

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. In other words, in this embodiment, the outlet box 400 corresponds to a power connection device.

In this embodiment, the inverter 420 body does not have 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.

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 external loads is eliminated from the power conditioner 420, reducing costs, 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.

<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. The power supply system 5 differs from the power supply system 1 in that the power supply system 5 includes a heat dissipation fan device 511 that is detachably provided in the power conditioner 120.

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 that can be connected to the cigarette lighter socket 133 of the electric vehicle 130.

2, when the inverter 120 is used as a V2H device in conjunction with the fixed unit 110, it is installed vertically with the handle 22 facing upwards, 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 of the housing 21 facing upwards, which creates a problem that the heat dissipation structure described above does not function properly. 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 unit 511, improving the problem of poor heat dissipation caused by placing it flat.

In addition, by making it possible to connect the heat dissipation fan device 511 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 a power source, such as during a disaster.

＜Other＞
The above-mentioned embodiments are merely illustrative of the present invention, and the present invention is not limited to the above-mentioned specific forms. Various modifications of the present invention are possible within the scope of the 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, the power line connector pin may be formed longer than the signal line connector pin, and the power conditioner may be stopped when a state in which power is ON and (some) signal is OFF is detected. In addition, each modified example of the embodiment 1 may be combined with the embodiment 2 or 3 to form a power supply system.

In addition, in the third embodiment, the heat dissipation fan device 511 is configured to be detachably attached to the power conditioner 120, but it is also possible to configure the power conditioner 120 to have a built-in heat dissipation fan and to have a dedicated intake and exhaust port.

In addition, in each of the above examples, an AC 100V outlet is used as an output terminal, but this is not limited to this, and it is possible to provide the inverter with a desired output terminal, such as a USB terminal. Furthermore, it is also possible to provide an input/output terminal that can input power as well as output it.

The power supply systems in the above examples can also be operated in conjunction with or as part of other smart grid systems such as a HEMS (Home Energy Management System).

<Appendix 1>
A power supply system (1) that connects a power grid (150) and a mobile external power source (131) in an interconnectable manner,
a facility side connection section (111) connected to a power input/output section (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 first unit (110) including a power transmission path (C) connecting the facility side connection section 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 and 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 and 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:

1, 2, 3, 4, 5... Power supply system 110, 210... Fixed unit 111... Facility side connection part 112... Fixed side connector 113... Switch 11... Power conditioner support part 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, 3 25... Control circuit 126... Operation unit 127... Display unit 128, 402... Output terminal 21... Housing 22... Handle 321... Connection detection signal transmitter 322... Connection detection signal receiver 130... Electric vehicle 131... Storage battery 132... EV connector 133... Cigarette lighter socket 140... Distribution board 150... Power system 400... Outlet box 401... Outlet box connector 511... Heat dissipation fan device 512... Power supply unit C... Power circuit

Claims (13)

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: 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 . 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/close 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. 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: 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: 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. The power supply system according to claim 6, characterized in that the power terminal of the power connection device is an AC 100V outlet. The power supply system according to any one of claims 1 to 7, characterized in that the second unit further comprises a heat dissipation fan. The power supply system according to claim 8, characterized in that the heat dissipation fan is configured to be detachably attached to the second unit. 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: 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: 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. 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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