Power supply device and power supply system

Abstract

To provide a portable power supply device capable of supplying power to meet the various needs using a storage battery provided in a vehicle as a power supply, and a power supply system.SOLUTION: The power supply device includes: a DC / DC converter that converts supplied DC power to DC power having a different voltage value; a power supply-side terminal connected to a DC power supply that supplies the DC power to the DC / DC converter; a load-side terminal to which the DC power after conversion output from the DC / DC converter is applied and which is connected to a load; a power supply-side DC circuit including a relay provided between the power supply-side terminal and the DC / DC converter; a load-side DC circuit including a relay provided between the load-side terminal and the DC / DC converter; and a control unit that controls turning on / off of the relay. The DC / DC converter, the power supply-side terminal, the load-side terminal, the power supply-side DC circuit, the load-side DC circuit, and the control unit are housed in a trunk-type enclosure.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a portable power supply device and power supply system that uses a storage battery provided in a vehicle as a power source and is capable of supplying power in response to a variety of needs. [Background technology]

[0002] The storage batteries installed in electric vehicles have a relatively large battery capacity. Technologies have been proposed to realize V2H (Vehicle to Home), which enables the power stored in these vehicles to be supplied not only to the electric vehicle but also to loads within the home, for example. In addition to V2H, technologies have also been proposed to realize V2X, including V2B (Vehicle to Building), which enables the supply of power to larger buildings, and V2G (Vehicle to Grid), which enables supply to the power grid. These technologies are expected to enable the supply of power stored in mobile electric vehicles to maintain life and keep factories operating, even in the event of a power outage due to a disaster.

[0003] To realize V2X, stationary charging / discharging devices are installed in homes or buildings to which power is supplied so that they can be charged and discharged systematically over a wide area under the control of an EMS (Energy Management System) (Patent Document 1, etc.). On the other hand, taking advantage of the mobility of electric vehicles, portable power supply devices that do not fixate the power supply destination have also been put into practical use (Patent Document 2, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6773207 [Patent Document 2] Japanese Patent Publication No. 2020-202744 Summary of the Invention [Problem to be solved by the invention]

[0005] To realize V2H, it is basically desirable for the power supply device to be equipped with an inverter that converts the power from the electric vehicle's storage battery as a power source so that it can be output as single-phase 100V AC, as disclosed in Patent Document 2. However, in order to operate building elevators even in emergencies, single-phase 100V AC is insufficient to maintain the operation of life infrastructure (water supply and drainage pumps, etc.), and higher voltage power or three-phase power is required. It is desirable to be able to supply necessary power not only to homes but also to other areas.

[0006] An object of the present invention is to provide a portable power supply device and power supply system that uses a storage battery provided in a vehicle as a power source and is capable of supplying power in response to a variety of needs. [Means for solving the problem]

[0007] A power supply device according to an embodiment of the present disclosure includes a DC / DC converter that converts supplied DC power into DC power of a different voltage value, a power supply-side terminal connected to a DC power source that supplies DC power to the DC / DC converter, a load-side terminal to which converted DC power output from the DC / DC converter is applied and connected to a load, a power supply-side DC circuit including a relay provided between the power supply-side terminal and the DC / DC converter, a load-side DC circuit including a relay provided between the load-side terminal and the DC / DC converter, and a control unit that controls the on / off of the relay, all of which are housed in a trunk-type housing.

[0008] The power supply device of the present disclosure is portable and includes a power supply terminal for connecting a DC power source to a DC / DC converter and a load terminal for connecting the DC / DC converter to a load. The power supply device can also use a large-capacity storage battery of an electric vehicle as a DC power source and output DC power to a load outside the home.

[0009] The power supply terminal and the load terminal may be a power cable connector or a screw for connecting to a power line. The connecting portion of the power cable connected to the power supply terminal and the load terminal may be a connector terminal, a Y-shaped terminal, an O-shaped terminal, or the like.

[0010] The power supply device of one embodiment of the present disclosure may include a switch that detects whether a lid provided on the housing is opened or closed, and the control unit may turn off the relays of the power supply side DC circuit and the load side DC circuit when the lid is open.

[0011] The power supply device of the present disclosure cannot start operation if the lid of the housing is open, thereby enabling safe operation.

[0012] The power supply device according to an embodiment of the present disclosure may further include a power supply side connection terminal that branches and outputs the power supplied from the DC power supply.

[0013] The power supply device of the present disclosure can branch off power from the battery of an electric vehicle to connect to other power supply devices, thereby enabling them to be connected in parallel and used to achieve high output power.

[0014] In the power supply device according to the embodiment of the present disclosure, the power supply side connection terminal may be an inlet.

[0015] In the power supply device of the present disclosure, the power supply side connection terminal is configured as an inlet, so that a power cable with a plug connected to another power supply device can be safely and easily connected by connecting it to the inlet. An inlet is a port into which a plug at the end of a charging / discharging cable is inserted, and is usually attached to a vehicle.

[0016] The power supply device according to an embodiment of the present disclosure may branch and output power from the DC power supply to a power supply side terminal of another power supply device via a power cable connected to the power supply side connection terminal.

[0017] The power supply device of the present disclosure can also be connected to another power supply device using a power cable for connection other than a power cable for charging.

[0018] The power supply device according to an embodiment of the present disclosure may be connected to a power supply side connection terminal of another power supply device via a power cable connected to the power supply side terminal.

[0019] The power supply device of the present disclosure can also be connected and coupled with a power cable for charging.

[0020] The power supply device according to an embodiment of the present disclosure may further include a load-side connection terminal that receives DC power output from another DC / DC converter and is connected to the load-side terminal.

[0021] The power supply device of the present disclosure can be directly or indirectly connected to another power supply device on the load side to combine the outputs into one.

[0022] In the power supply device according to one embodiment of the present disclosure, the control unit may perform control in either a first operation mode in which processing based on a predetermined sequence is performed between the power supply device and an on-board charge / discharge control device that controls charging and discharging of a storage battery provided in an electric vehicle to use the storage battery as the DC power source, or a second operation mode in which processing based on the predetermined sequence is omitted.

[0023] The power supply device of the present disclosure is configured to be operable in two modes: an independent operation mode (first operation mode) and a connected operation mode (second operation), and is capable of handling both independent operation and connected operation.

[0024] The power supply device of one embodiment of the present disclosure may include an operation unit that accepts selection of either the first operation mode or the second operation mode, and the control unit may perform control in the mode selected by the operation unit.

[0025] In the power supply device of the present disclosure, it is possible to switch between the independent operation (first operation mode) and the coupled operation (second operation mode) by a user operation.

[0026] The power supply device according to an embodiment of the present disclosure further includes an inverter that converts the DC power output from the DC / DC converter into three-phase AC power.

[0027] The power supply device of the present disclosure can also convert DC power converted by the DC / DC converter into AC power and provide it.

[0028] A power supply system according to one embodiment of the present disclosure includes an electric vehicle having a storage battery and an on-board charge / discharge control device that controls charging and discharging of the storage battery, and a plurality of power supply devices each having a DC / DC converter that converts DC power from the storage battery of the electric vehicle into DC power of a different voltage value, the DC power from the storage battery is branched to the DC / DC converter, and the DC power output from the DC / DC converters of the plurality of power supply devices is output to a load.

[0029] The power supply system of one embodiment of the present disclosure may further include a connection box having a plurality of terminals and one terminal connected to the plurality of terminals via a power line, and may input DC powers output from the plurality of power supply devices to the plurality of terminals, and output DC power combined with the DC powers from the one terminal of the connection box.

[0030] In the power supply system of one embodiment of the present disclosure, the connection box may further include an inverter that combines DC power input to the plurality of terminals and converts it into three-phase AC power, and the one terminal may be a terminal that outputs the three-phase AC power.

[0031] The power supply system disclosed herein uses a portable power supply device to realize a power supply system that enables the storage battery of an electric vehicle to be used as a DC power source for operating large machinery that requires a high-output DC power source. [Effects of the Invention]

[0032] According to the present disclosure, a portable power supply device can supply power in response to a variety of needs. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 2 is a schematic diagram of a power supply device. [Figure 2] 1 is a block diagram showing a configuration of a power supply device according to a first embodiment. [Figure 3] 10 is a flowchart illustrating an example of a start process procedure performed by a control unit. [Figure 4] FIG. 10 is a block diagram showing the configuration of a power supply device according to a second embodiment. [Figure 5] FIG. 10 is a block diagram showing the configuration of a power supply device according to a third embodiment. [Figure 6] FIG. 10 is a block diagram showing the configuration of a power supply device according to a fourth embodiment. [Figure 7] FIG. 10 is a block diagram showing the configuration of a power supply device according to a fifth embodiment. [Figure 8] FIG. 10 is a block diagram showing the configuration of a power supply device according to a sixth embodiment. [Figure 9] FIG. 13 is a block diagram showing the configuration of a power supply device according to a seventh embodiment. [Figure 10] FIG. 13 is a block diagram showing a configuration of a power supply device according to a modification of the seventh embodiment; [Figure 11] FIG. 13 is a block diagram showing the configuration of a power supply device according to an eighth embodiment. [Figure 12] FIG. 13 is a block diagram showing the configuration of a power supply device according to a ninth embodiment. [Figure 13] 13 is a flowchart illustrating an example of a start process procedure performed by a control unit of a power supply device according to a ninth embodiment. [Figure 14] FIG. 23 is a block diagram showing the configuration of a power supply device according to a tenth embodiment. [Figure 15] FIG. 23 is a block diagram showing the configuration of a power supply device according to a modification of the tenth embodiment. [Figure 16] FIG. 22 is a block diagram showing the configuration of a power supply device according to an eleventh embodiment. [Figure 17] FIG. 23 is a block diagram showing the configuration of a power supply device according to a twelfth embodiment. [Figure 18] FIG. 23 is a block diagram showing the configuration of a power supply device according to a modification of the twelfth embodiment. [Figure 19] FIG. 23 is a block diagram showing the configuration of a power supply device according to a thirteenth embodiment. [Figure 20] FIG. 23 is a block diagram showing the configuration of a power supply device according to a fourteenth embodiment. [Figure 21] FIG. 23 is a block diagram showing the configuration of a power supply system according to a fifteenth embodiment. [Figure 22] FIG. 22 is a block diagram showing the configuration of a power supply system according to a sixteenth embodiment. [Figure 23] FIG. 22 is a block diagram showing the configuration of a power supply system according to a seventeenth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present disclosure will be specifically described with reference to the drawings showing embodiments thereof.

[0035] (First embodiment) Fig. 1 is a schematic diagram of a power supply device 1, and Fig. 2 is a block diagram showing the configuration of the power supply device 1 according to the first embodiment. The power supply device 1 has a trunk-type housing 11. Fig. 1 shows the housing 11 with a lid 110 open. The power supply device 1 includes a power supply side terminal 12, a DC / DC converter 13, a control unit 14, a power supply unit 15, a load side terminal 16, a switch 17, an operation unit 18, and an output unit 19.

[0036] The base end of a power cable 3 having a plug 31 at its tip is connected to the power supply side terminal 12. The plug 31 can be connected to a charge / discharge inlet VI that is connected to a storage battery of an electric vehicle V. The power supply side terminal 12 and power cable 3 should preferably be capable of rapid charging (400 V, 100 A). The power supply side terminal 12 is connected to a DC / DC converter 13 via a power supply side DC circuit 131 (see FIG. 2).

[0037] The DC / DC converter 13 is an isolated converter that converts DC power supplied from the storage battery of the electric vehicle V into DC power of a different voltage value. The DC / DC converter 13 is configured, for example, to convert DC power (100 A or 10 A) discharged from the storage battery of the electric vehicle V into DC power of 280 V (for example, 10 kW). The DC / DC converter 13 includes a power supply side DC circuit 131 including a relay interposed between the power supply side terminal 12 and the DC / DC converter 13. The DC / DC converter 13 includes a load side DC circuit 132 including a relay interposed between the DC / DC converter 13 and the load side terminal 16.

[0038] The control unit 14 is started by startup power obtained from the power supply unit 15, and executes control including connection processing in accordance with standards via the power cable 3 between the control unit 14 and an on-board charge / discharge control device that controls charging and discharging of the storage battery of the connected electric vehicle V. Based on information obtained from the on-board charge / discharge control device and signals from the operation unit 18 and the switch 17, the control unit 14 controls the connector lock between the plug 31 and the charge / discharge inlet VI of the electric vehicle V, and the on / off of the power supply side DC circuit 131 and the load side DC circuit 132.

[0039] The power supply unit 15 includes a start-up battery, and provides power to the control unit 14 until power is supplied from the storage battery of the electric vehicle V. The start-up battery is a storage battery, and is charged with power when power supply from the storage battery of the electric vehicle V begins.

[0040] A power cable 4, which is connected to a load to which power is supplied, is connected to the load side terminal 16. The power cable 4 is a cable for 280 V DC power that matches the output from the DC / DC converter 13. The load side terminal 16 is connected to the output of the DC / DC converter 13 via a load side DC circuit 132.

[0041] The switch 17 is a limit switch for detecting whether the lid 110 is open or not. When the lid 110 is open, the control unit 14 is configured to disable the start or continuation of power supply (turning on the relays in the power supply side DC circuit 131 and the load side DC circuit 132). The switch 17 may have other configurations as long as it can determine whether the lid 110 is open or not. In addition to a mechanical switch such as a limit switch, the switch 17 may be, for example, a proximity sensor or an open / close sensor with another mechanism.

[0042] The operation unit 18 includes physical buttons, including a start button 181 and a stop button 182.

[0043] The output unit 19 is a lamp, a display, a speaker, or the like. In Fig. 1, the output unit 19 is a display. The control unit 14 causes the output unit 19 to output colored light, characters, images, or sounds that indicate the operation content of the operation unit 18 and the state of the power supply device 1 as a result of the operation on the operation unit 18.

[0044] 3 is a flowchart showing an example of a processing procedure performed by the control unit 14. When the start button 181 of the operation unit 18 is turned on, the control unit 14 executes the following processing.

[0045] The control unit 14 confirms that the plug 31 of the power cable 3 is connected to the inlet VI of the electric vehicle V (step S101). The connection can be confirmed by determining whether or not a predetermined signal can be sent and received. If the connection is not established, an error occurs and the start process cannot be executed. After confirming the connection, the control unit 14 determines whether or not a voltage equal to or greater than a predetermined voltage is being applied to the power supply side terminal 12 (step S102).

[0046] If it is determined that the voltage is not applied (S102: NO), the condition is normal, and the control unit 14 starts transmitting and receiving information (connection sequence) with the charge / discharge control device of the electric vehicle V (step S103). In step S103, the control unit 14 executes a connector lock process for the plug 31.

[0047] When the control unit 14 is ready for discharge by transmitting and receiving information to and from the charge / discharge control device of the electric vehicle V through the process of step S103, it turns on the relays of the power supply side DC circuit 131 and the load side DC circuit 132 to start power supply using the storage battery of the electric vehicle V as the power source (step S104).The start process then ends.

[0048] If it is determined that the voltage is being applied (S102: YES), an abnormality occurs, and the control unit 14 performs an abnormal stop (step S105) and ends the start process.

[0049] The power supply device 1 configured in this manner is portable. A user (operator) can either grasp the handles on the side of the housing 11 and lift and carry the entire power supply device 1, or transport it using wheels on one of the exterior surfaces or sides of the housing 11. The user transports the power supply device 1 to the installation location of the load they wish to use. The power supply device 1 may also be transported by an electric vehicle V that serves as a power source. The user installs the electric vehicle V and the power supply device 1 near a load such as factory equipment, inserts the plug 31 of the power cable 3 from the power supply device 1 into a charging / discharging inlet (socket) VI of the electric vehicle V, and connects the power cable 4 to a load requiring 280V DC power. When the user closes the cover 110 of the power supply device 1 and presses the start button 181, the control unit 14 detects this. The control unit 14 turns on the relay of the power supply side DC circuit 131 to send and receive information to and from the in-vehicle charge / discharge control device, receives power from the storage battery of the electric vehicle V, turns on the relay of the load side DC circuit 132, and outputs DC power from the load side terminal 16. This allows appropriate power to be supplied to the load, enabling operation.

[0050] At least one power supply device 1 of the first embodiment can supply DC power, for example, 10kW 280V DC power, required to operate large machinery, rather than AC 100V power (1 to 20A) for home use.

[0051] (Second embodiment) In the second embodiment, the power supply device 1 outputs three-phase AC power. Fig. 4 is a block diagram showing the configuration of the power supply device 1 in the second embodiment. Among the configuration of the power supply device 1 of the modified example, the configurations common to the power supply device 1 of the first embodiment are assigned the same reference numerals and detailed description thereof will be omitted.

[0052] The power supply device 1 of the second embodiment includes an inverter 21 that converts DC power into AC power, located after the DC / DC converter 13. A load-side AC circuit 133 is provided between the output of the inverter 21 and a load-side terminal 16. The load-side terminal 16 in this modification corresponds to a power cable 4 for transmitting three-phase power. The inverter 21 converts, for example, 100 A DC power output by discharging from a storage battery of an electric vehicle V into three-phase 3W 200V AC power.

[0053] The load side terminal 16 of the power supply device 1 of the second embodiment is a terminal for three-phase AC output. The power cable 4 is selected from cables capable of transmitting three-phase 3W 200V AC power.

[0054] This makes it possible to supply three-phase AC power, for example, three-phase 3W 200V AC power, instead of household AC 100V power (1 to 20A) with at least one unit.

[0055] (Third embodiment) Facilities outside the home may require a high-output power source. Some storage batteries for electric vehicles V have a capacity of nearly 100 kW and can output a large current of 100 to 120 A. In order to enable the supply of high-output DC power (or three-phase AC) using the storage battery of the electric vehicle V as the power source via the power supply device 1, the power supply device 1 is configured to be connectable to other power supply devices 1.

[0056] Fig. 5 is a block diagram showing the configuration of a power supply device 1 of the third embodiment. Fig. 5 shows the configuration of a power supply system 100 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the third embodiment, the configurations common to the power supply device 1 of the first embodiment are assigned the same reference numerals and detailed description thereof will be omitted.

[0057] The two power supply devices 1 in the third embodiment have the same configuration. Each of the power supply devices 1 includes two power supply side terminals 12a and 12b and two load side terminals 16a and 16b.

[0058] The first power supply device 1 has two power supply side terminals 12a, 12b, to which one, power supply side terminal 12a, is connected a power cable 3, and to the other power supply side terminal 12b, a connection cable 5a is connected. The power supply side terminal 12b is connected to a contact point between the power supply side terminal 12a and the power supply side DC circuit 131. The connection cable 5a may be a high current (100 A) cable used for rapid charging like the power cable 3, or it may be a lighter cable for medium-speed charging capable of transmitting a current of about 10 A.

[0059] The first power supply device 1 has two load side terminals 16a, 16b, of which one, load side terminal 16a, is connected to a power cable 4 to be connected to a load. The other, load side terminal 16b, is connected to a connection cable 5b. The connection cable 5b may be for DC power (280V) like the power cable 4. The load side terminal 16b is connected to a contact point between the load side terminal 16a and the load side DC circuit 132.

[0060] Similarly, the two power supply side terminals 12a, 12b of the second power supply device 1 have a power cable 3 connected to one (12a) and a connection cable 5a connected to the other (12b). The connection cable 5a connected to the power supply side terminal 12b is connected to the power supply side terminal 12b of the first power supply device 1. The power supply side terminal 12a is not limited to a power cable 3 capable of rapid charging, and a cable for medium-speed charging may also be connected. The power cable 3 of the second power supply device 1 may be stored in the housing 11 to prevent the user from touching it. The plug 31 of the power cable 3 connected to the power supply side terminal 12a of the second power supply device 1 may be sealed with a cap to prevent the user from touching it.

[0061] The second power supply device 1 may be provided with one power supply terminal 12 instead of two power supply terminals 12a, 12b, and the connected power cable 3 may be removed and the connection cable 5a may be connected.

[0062] The connection cable 5b connected to the load terminal 16b of the first power supply device 1 is connected to one load terminal 16a of the two load terminals 16a and 16b of the second power supply device 1. The other load terminal 16b is connected so that power received at the load terminal 16b can be applied to the one load terminal 16a.

[0063] The operation unit 18 of the second power supply device 1 is provided with an interface for setting whether the second power supply device 1 is in an "independent operation mode" in which the device is used alone, or in a "connected operation mode" in which the device is connected to another power supply device 1. The interface for setting the mode is configured, for example, by a physical button and a display of the output unit 19. This interface may be configured to display the currently set state of two options (for example, "independent operation mode" and "connected operation mode") on the display, and to cycle between the two options each time the user presses a button.

[0064] The control unit 14 of the power supply device 1 in the "connected operation mode" may automatically determine that it is not necessary to exchange information with the vehicle-mounted charge / discharge control device when the power cable 3 is not connected.

[0065] To use the power supply system 100 of the third embodiment in which two power supply devices 1 are connected in parallel, a user (operator) inserts the plug 31 of the power cable 3 connected to the power supply terminal 12a of the first power supply device 1 into the charge / discharge inlet VI of the electric vehicle V. The user then connects the power cable 4 connected to the load terminal 16a of the first power supply device 1 to a load requiring 280V DC power. The user then closes the covers 110 of the two power supply devices 1, selects the "independent operation mode" on the operation unit 18 of the first power supply device 1, and selects the "connected operation mode" on the operation unit 18 of the second power supply device 1. After making these selections, the user presses the start button 181 of each power supply device 1 (or the first power supply device 1). The control unit 14 of the first power supply device 1 in the "independent operation mode" executes the processing procedure shown in the flowchart of FIG. 3 of the first embodiment. The control unit 14 turns on the power supply side DC circuit 131 to send and receive information with the in-vehicle charge / discharge control device, receives a supply of power from the storage battery of the electric vehicle V, and outputs DC power from the load side terminal 16a. The control unit 14 of the second power supply device 1 turns on the power supply side DC circuit 131 and, when it receives a supply of power via the connection cable 5a, starts outputting 280V DC power from the DC / DC converter 13. The output from the second DC / DC converter 13 is supplied from the load side terminal 16a via the connection cable 5b to the load side terminal 16b of the first power supply device 1, and the output from the power cable 4 increases.

[0066] As a result, in the second embodiment, the combined power (for example, 280V DC, 20kW) of the outputs from the two power supply devices 1 connected in parallel can be output from the load side terminal 16a of the first device.

[0067] The power supply device 1 of the third embodiment has been described as being used by selecting either the "independent operation mode" or the "connected operation mode" via the operation unit 18. However, this is not limiting, and when the power cable 3 is connected and power is being supplied, the control unit 14 may detect that the input voltage is less than a predetermined voltage (for example, 150 V) and determine that the mode is the "independent operation mode," or conversely, may determine that the mode is the "connected operation mode" when it detects a voltage equal to or greater than the predetermined voltage (150 V).

[0068] (Fourth embodiment) Fig. 6 is a block diagram showing the configuration of a power supply device 1 of the fourth embodiment. Fig. 6 shows the configuration of a power supply system 100 including three power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the fourth embodiment, the configurations common to the power supply devices 1 of the first and third embodiments are assigned the same reference numerals and detailed description thereof will be omitted.

[0069] The three power supply devices 1 in the fourth embodiment have the same configuration. Each of the power supply devices 1 in the fourth embodiment has two power supply side terminals 12a, 12b and one load side terminal 16. The power supply side DC circuit 131 of the power supply device 1 in the fourth embodiment includes a fuse in addition to a relay, and the load side DC circuit 132 includes a fuse and a breaker in addition to the relay. The fuse in the power supply side DC circuit 131 is provided between the relay and the DC / DC converter 13. In the load side DC circuit 132, the fuse and breaker are connected between the DC / DC converter 13 and the load side terminal 16 in the order of relay, fuse, and breaker from upstream.

[0070] Each power supply device 1 may be provided with a switch for enabling / disabling ground fault detection, and the control unit 14 may control the power supply device 1 by setting ground fault detection to be enabled in the "standalone operation mode" and to be disabled in the "connected operation mode."

[0071] Furthermore, in the fourth embodiment, a parallel connection box 6 is provided in the subsequent stage of the three power supply devices 1 connected in parallel to form a power supply system.

[0072] In the fourth embodiment, a power cable 3 is connected via a fuse to one power supply side terminal 12a of a first power supply device 1. A connection cable 5c is connected to the other power supply side terminal 12a of the first power supply device 1.

[0073] A power cable 3 is connected to one power supply side terminal 12a of each of the second and third power supply devices 1, but neither is used in the fourth embodiment. A connection cable 5c is connected to the other power supply side terminal 12b of the second power supply device 1, allowing power from the storage battery of the electric vehicle V to be branched and input.

[0074] In the fourth embodiment, the three power cables 4 connected to the load side terminals 16 of the first to third power supply devices 1 are all connected to a junction box 6. The junction box 6 has multiple input terminals and one output terminal, and the power lines are wired so that the DC power input to the multiple input terminals inside is combined into one. The junction box 6 combines the 280V DC power (10 kW) from the power cables 4 of the three power supply devices 1 into one, and 30 kW of DC power is output from the output terminal of the junction box 6.

[0075] Each of the three power supply devices 1 of the fourth embodiment operates in either the "independent operation mode" or the "connected operation mode", similarly to the third embodiment.

[0076] In the configuration of the power supply device 1 of the fourth embodiment, there is no need to connect the connection cables 5b on the load side between multiple power supply devices 1 using the connection box 6 provided outside the device. The user (operator) only needs to connect the power cables 4, which are the outputs of the power supply devices 1, to the connection boxes 6, respectively, and one connection box 6 can be used as the power source for the load.

[0077] (Fifth embodiment) Fig. 7 is a block diagram showing the configuration of a power supply device 1 of the fifth embodiment. Fig. 7 shows the configuration of a power supply system 100 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the fifth embodiment, the configurations common to the power supply devices 1 of the first, third and fourth embodiments are assigned the same reference numerals and detailed description thereof will be omitted.

[0078] In the power supply device 1 in the fifth embodiment, the second power supply side terminal 12b is connected to the contact between the relay and the downstream fuse in the power supply side DC circuit 131. In the fifth embodiment, the power cable 3 in the second power supply device 1 is disconnected, and the connection cable 5c is connected to the first power supply side terminal 12a. This prevents the power supply side terminals 12a, 12b of the second power supply device 1 from being applied with voltage due to the output from the storage battery of the electric vehicle V, even though the relay in the power supply side DC circuit 131 is off.

[0079] (Sixth embodiment) Fig. 8 is a block diagram showing the configuration of a power supply device 1 of the sixth embodiment. Fig. 8 shows the configuration of a power supply system 100 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the sixth embodiment, the configurations common to the power supply devices 1 of the first, third and fourth embodiments are given the same reference numerals and detailed description thereof will be omitted.

[0080] Each of the power supply devices 1 in the sixth embodiment has a second power supply side terminal 12b. The power supply side terminal 12b is connected to a contact between the power supply side terminal 12a to which the power cable 3 is connected and a relay in the power supply side DC circuit 131. The power supply devices 1 in the sixth embodiment further have a relay provided between the contact and the power supply side terminal 12b. This relay is turned on when the relay between the power supply side terminal 12a in the power supply side DC circuit 131 and the DC / DC converter 13 is turned on.

[0081] In the sixth embodiment, the power cable 3 of the second power supply device 1 is disconnected, and the connection cable 5c connected to the power supply side terminal 12b of the first power supply device 1 is connected to the power supply side terminal 12a of the second power supply device 1. This prevents the voltage from the storage battery of the electric vehicle V from being applied to the plug 31 of the power cable 3 connected to the power supply side terminal 12a of the second power supply device 1, even though the relay of the power supply side DC circuit 131 of the second power supply device 1 is off.

[0082] (Seventh embodiment) Fig. 9 is a block diagram showing the configuration of a power supply device 1 of the seventh embodiment. Fig. 9 shows the configuration of a power supply system 100 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the seventh embodiment, the configurations common to the power supply devices 1 of the first and third embodiments are assigned the same reference numerals and detailed description thereof will be omitted.

[0083] The power supply device 1 of the seventh embodiment has an inlet 12c connected to a contact between the power supply side terminal 12 and a relay in the power supply side DC circuit 131. The inlet 12c can be connected to a power cable 3 connected to the power supply side terminal 12 of another power supply device 1.

[0084] The two power supply devices 1 in the seventh embodiment are connected by a signal line 22. The signal line 22 connects the control units 14 to each other (not shown). The control content in the control unit 14 is the same as that described in the third embodiment. The control unit 14 is connected to the electric vehicle V, and when the "autonomous operation mode" is selected, outputs information on the upper limit current value obtained from the charge / discharge control device of the electric vehicle V from the signal line 22. Mutual transmission and reception of information via the signal line 22 is not necessarily required, and the control unit 14 may determine whether or not the "autonomous operation mode" is in effect based on whether or not the value of the voltage applied to the power supply side terminal 12 is equal to or greater than a predetermined voltage value.

[0085] Furthermore, since information can be transmitted and received between the first power supply device 1 and the second power supply device 1 via the signal line 22, if the first control unit 14 controls the connector lock of the plug 31 when communicating with the charge / discharge control device of the electric vehicle V, the second control unit 14 may notify the second control unit 14 of this. Upon receiving the connector lock notification, the second control unit 14 also controls the connector lock of the plug 31 connected to the inlet 12c of the first power supply device 1. The control unit 14 of the second power supply device 1 preferably controls the relay connected to the inlet 12c on the second power supply device 1 side to turn off. This is to prevent high-output power from being applied to the exposed terminal of the inlet 12c.

[0086] The power supply device 1 of the seventh embodiment has two load-side terminals 16a and 16b. A power cable 4 is connected to the load-side terminal 16a of the first power supply device 1, and a connection cable 5b is connected to the load-side terminal 16b. A connection cable 5b is connected to the first load-side terminal 16a of the second power supply device 1, and nothing is connected to the second load-side terminal 16b. As a result, DC power output from the DC / DC converter 13 of the second power supply device 1 is applied to the power cable 4 connected to the first power supply device 1, making it possible to output 20 kW of DC power.

[0087] The configuration in which the inlet 12c of the power supply device 1 of the seventh embodiment is provided facilitates connection from the second power supply device 1 to the first power supply device 1. Compared to a case in which the power cable 3 of the second power supply device 1 is left open without being used, it is possible to prevent a situation in which a high output voltage is applied to the plug 31 even though the second power supply device 1 is not connected to the electric vehicle V.

[0088] (Variation 1) 10 is a block diagram showing the configuration of a power supply device 1 according to a modification of the seventh embodiment. In this modification, each power supply device 1 has one load-side terminal 16, and the power cable 4 is connected from the load-side terminal 16 to an externally provided connection box 6. The other configurations are the same as those of the seventh embodiment, and therefore detailed description thereof will be omitted.

[0089] In the modification of the seventh embodiment, each power supply device 1 does not have two load side terminals 16a and 16b, but has only one load side terminal 16. There is no need to change the connection of the power cable 4 or the connection cable 5c at the load side terminal 16.

[0090] In the seventh embodiment, two power supply devices 1 are connected in parallel, so that high-output DC power of 20 kW can be provided from the connection box 6.

[0091] (Eighth embodiment) Fig. 11 is a block diagram showing the configuration of a power supply device 1 of the eighth embodiment. Fig. 11 shows the configuration of a power supply system 100 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 of the eighth embodiment, the configurations common to the power supply devices 1 of the first and third embodiments are assigned the same reference numerals and detailed description thereof will be omitted.

[0092] The control details of the control unit 14 of the power supply device 1 of the eighth embodiment are the same as those described in the third embodiment. The control unit 14 determines whether or not the "autonomous operation mode" is in progress based on whether or not the value of the voltage applied to the power supply side terminal 12 is equal to or greater than a predetermined voltage value. The control units 14 may be connected to each other using a signal line 22 so as to be able to send and receive information, and the control units 14 may exchange information such as an upper limit current value notified by a charge / discharge control device of the electric vehicle V with each other. The power supply devices 1 may exchange information not only by sending and receiving signals via the signal line 22 but also by Ethernet (registered trademark) communication, CAN (Controller Area Network) communication, serial communication, or communication via the I / O of the control unit 14.

[0093] In the eighth embodiment, as in the third embodiment, in the first power supply device 1, the power cable 4 is connected to the load side terminal 16a, and the connection cable 5b is connected to the load side terminal 16b. In the second power supply device 1, the connection cable 5b is connected to the first load side terminal 16a, and nothing is connected to the second load side terminal 16b. The DC power output from the DC / DC converter 13 of the second power supply device 1 is applied to the power cable 4 connected to the first power supply device 1, making it possible to output 20 kW of DC power.

[0094] The power supply device 1 of the eighth embodiment has an inlet 12c connected to a contact between the power supply side terminal 12 and a relay in the power supply side DC circuit 131. The inlet 12c can be connected to a power cable 3 connected to the power supply side terminal 12 of another power supply device 1. In the eighth embodiment, a relay is further provided between the contact and the inlet 12c. The relay, together with the relay in the power supply side DC circuit 131, is turned on by the control unit 14.

[0095] This makes it possible to use the plug 31 of the power cable 3 of the second power supply device 1 and avoid a situation in which a high output voltage is applied to the power supply side terminal 12a of the second power supply device 1 until power supply starts.

[0096] In the configuration of the eighth embodiment, as in the modified example of the seventh embodiment, the load side terminal 16b may not be provided, and the power cables 4 from the two power supply devices 1 may be connected to the connection box 6, respectively (not shown).

[0097] (Ninth embodiment) Fig. 12 is a block diagram showing the configuration of a power supply device 1 in the ninth embodiment. Fig. 12 shows the configuration of two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 in the ninth embodiment, the configurations common to the power supply devices 1 in the first and third embodiments are assigned the same reference numerals and detailed description thereof will be omitted.

[0098] In the power supply device 1 of the ninth embodiment, a connection cable 5a connected to the power supply terminal 12b of the first power supply device 1 is connected to the power supply terminal 12a of the second power supply device 1. The power supply terminal 12b of the second power supply device 1 is not used.

[0099] In the power supply device 1 of the ninth embodiment, the two power supply side terminals 12a, 12b of each power supply device 1 are provided with terminals 12d, 12e of a signal line that transmits information exchanged between the charge / discharge control device of the electric vehicle V and the control unit 14. The terminals 12d, 12e are connected to the control unit 14 of the power supply device 1. A relay (not shown) that switches between allowing or disallowing signal transmission and reception may be provided between the terminal 12d and the control unit 14.

[0100] In the ninth embodiment, the second power supply device 1 can also obtain information transmitted and received between the second power supply device 1 and the charge / discharge control device of the electric vehicle V. The "independent operation mode" is selected on the operation unit 18 of the first power supply device 1, and the "connected operation mode" is selected on the operation unit 18 of the second power supply device 1. This enables the control described below.

[0101] 13 is a flowchart showing an example of a start process procedure by the control unit 14 of the power supply device 1 in the ninth embodiment. In both the first and second power supply devices 1, the control unit 14 executes the following process when the start button 181 of either operation unit 18 is turned on.

[0102] The control unit 14 determines whether the "independent operation mode" is set (step S201). If it is determined that the "independent operation mode" is set (S201: YES), the control unit 14 checks whether the plug 31 is connected to the inlet VI or the inlet 12c (no distinction is made) (step S202). If not connected, an error occurs.

[0103] After confirming that the connection is established, the control unit 14 determines whether a voltage equal to or greater than a predetermined voltage is applied to the power supply side terminal 12a (step S203). If it is determined that no voltage is applied (S203: NO), the "independent operation mode" is normal, and the control unit 14 turns on the relay connected to the terminal 12d and starts transmitting and receiving information to and from the charge / discharge control device (connection sequence) (step S204). In step S104, the control unit 14 may notify the control unit 14 of the power supply device 1 to be connected and cause the control unit 14 to execute a connector lock process for the plug 31.

[0104] When the control unit 14 is ready for discharge by transmitting and receiving information to and from the charge / discharge control device of the electric vehicle V through the process of step S204, it turns on the relay connected to the power supply side terminal 12a and starts power supply using the storage battery of the electric vehicle V as the power source (step S205).The start process then ends.

[0105] If it is determined in step S203 that the voltage is being applied (S203: YES), this is an abnormality in the "independent driving mode", so the control unit 14 performs an abnormal stop (step S206) and ends the start process. When the abnormal stop occurs, the charge / discharge control device of the electric vehicle V is also notified.

[0106] If it is determined in step S201 that the "standalone operation mode" is not set (S201: NO), the "connected operation mode" is set. After confirming that the plug 31 is connected to the inlet VI or the inlet 12c (no distinction is made) (step S207), the control unit 14 determines whether a voltage equal to or higher than a predetermined voltage is applied to the power supply side terminal 12a (step S208).

[0107] If it is determined that the voltage is being applied (S208: YES), the "connected operation mode" is normal. When the power supply device 1 in the "standalone operation mode" is ready to discharge, the control unit 14 turns on the relay connected to the power supply side terminal 12a and starts power supply using the storage battery of the electric vehicle V as the power source (step S209). The start process then ends.

[0108] If it is determined in step S208 that the voltage is not applied (S208: NO), an abnormality occurs in the "connected operation mode", and the control unit 14 performs an abnormal stop (step S210) and ends the start process.

[0109] In the ninth embodiment, if the relay connected to the terminal 12d is on, both the first and second power supply devices 1 can acquire information exchanged with the charge / discharge control device of the electric vehicle V. If the control units 14 are connected using a separate signal line 22 and the voltage applied to the power cable 3 connected to the electric vehicle V can be known from both devices, the power supply system 100 can be started from either the first power supply device 1 or the second power supply device 1.

[0110] The configuration of the power supply device 1 of the ninth embodiment makes it possible to supply high-output (20 kW) DC power to a load from either of the two power supply devices 1 using the storage battery of the electric vehicle V as a power source.

[0111] (Tenth embodiment) Fig. 14 is a block diagram showing the configuration of a power supply device 1 in the tenth embodiment. Fig. 14 shows the configuration of a power supply system 200 including two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 in the tenth embodiment, components common to those in the first embodiment are assigned the same reference numerals and detailed description thereof will be omitted. The power supply system 200 shown in Fig. 14 includes a front-stage connection box 6a and a rear-stage connection box 6b.

[0112] The junction box 6a has one input terminal 61 connected to the electric vehicle V, and multiple inlets 62. In the example of FIG. 14, the junction box 6a has two inlets 62. Inside the junction box 6a, a power line from the terminal 61 is branched and wired to the multiple inlets 62. The junction box 6a has an internal control unit that executes a connection sequence between the junction box 6a and a charge / discharge control device of the electric vehicle V, and controls the junction box 6a to receive a supply of power.

[0113] The base end of a power cable 3 having a plug 31 used for quick charging at its tip is connected to an input terminal 61 of the connection box 6a.

[0114] In the power supply system 200 of the tenth embodiment, the power cables 7 connected to the power supply side terminals 12a of the plurality of power supply devices 1 are attached to the inlets 62 of the connection box 6a, and the power cables 4 connected to the load side terminals 16 of the power supply devices 1 are connected to the input terminals of the connection box 6b. Because the power cables 7 are not connected to the inlets VI of the electric vehicle V, they may be cables used for medium-speed charging rather than rapid charging.

[0115] The connection box 6b has multiple input terminals (two in FIG. 14) and one output terminal, and power lines are wired inside so that DC power input to the multiple input terminals is combined into one.

[0116] A power cable 4 for high-output DC power is connected to the output terminal of the junction box 6b and is connected to a load.

[0117] In the tenth embodiment, the two power supply devices 1 can be connected without distinguishing between them, as in the case of using them individually, without using the connection cables 5a, 5b, and 5c between the two power supply devices 1. However, in the tenth embodiment, one of the two power supply devices 1 operates in an "independent operation mode" and the other operates in a "connected operation mode." This enables the supply of high-output (20 kW) DC power.

[0118] Furthermore, in the tenth embodiment, the junction box 6b is used, but the junction box 6b may be omitted and a configuration may be provided with the load side terminals 16a and 16b, and connection may be made with the connection cable 5c.

[0119] (Variation) Fig. 15 is a block diagram showing the configuration of a power supply device 1 in a modified example of the tenth embodiment. Fig. 15 shows the configuration of a power supply system 200 including two power supply devices 1 connected in parallel and connection boxes 6a and 6b. The modified example of the tenth embodiment is the same as the power supply system 200 of the tenth embodiment shown in Fig. 14 except that the connection boxes 6a and 6b are integrated, and therefore a detailed description thereof will be omitted.

[0120] (Eleventh embodiment) Fig. 16 is a block diagram showing the configuration of a power supply device 1 of the eleventh embodiment. Fig. 16 shows the configuration of a power supply system 200 including two power supply devices 1 connected in parallel and a connection box 6. Of the configuration of the power supply device 1 in the eleventh embodiment, components common to those in the first embodiment are assigned the same reference numerals and detailed description thereof will be omitted. The power supply system 200 shown in Fig. 16 includes a front-stage connection box 6a and a rear-stage connection box 6c.

[0121] The junction box 6a has one input terminal 61 connected to the electric vehicle V, and multiple inlets 62. In the example of FIG. 16, the junction box 6a has two inlets 62. Inside the junction box 6a, a power line from the terminal 61 is branched and wired to the multiple inlets 62. The junction box 6a has an internal control unit that executes a connection sequence between the junction box 6a and a charge / discharge control device of the electric vehicle V, and controls the junction box 6a to receive a supply of power.

[0122] The base end of a power cable 3 having a plug 31 used for quick charging at its tip is connected to an input terminal 61 of the connection box 6a.

[0123] The power supply system 100 of the eleventh embodiment is configured such that the power cables 7 connected to the power supply side terminals 12a of the plurality of power supply devices 1 are each attached to the inlets 62 of the connection box 6a, and the power cables 4 connected to the load side terminals 16 of the power supply devices 1 are each connected to the input terminals of the connection box 6b. Because the power cables 7 are not connected to the inlets VI of the electric vehicle V, they may be cables used for medium-speed charging rather than rapid charging.

[0124] The junction box 6c has multiple input terminals (two in FIG. 14) and one output terminal, and power lines are wired so that the DC power input to the multiple input terminals is combined into one. The junction box 6c has an inverter 64 that converts DC power into AC power, and converts the combined DC power into three-phase AC power.

[0125] A power cable 4 for three-phase AC power is connected to the output terminal of the connection box 6b and is connected to a load.

[0126] In the tenth embodiment, the two power supply devices 1 can be connected to each other without using the connection cables 5a, 5b, and 5c between them, just as when they are used individually. However, in the tenth embodiment, one of the two power supply devices 1 is operated to operate in the "independent operation mode" and the other is operated to operate in the "connected operation mode."

[0127] By providing an inverter 64 in the connection box 6c, it is possible to generate high-power DC power and provide high-power three-phase AC power.

[0128] In the eleventh embodiment, the junction box 6a and the junction box 6c may also be integrally formed, as shown in the modified example of the tenth embodiment.

[0129] (Twelfth embodiment) Fig. 17 is a block diagram showing the configuration of a power supply device 1 in the twelfth embodiment. Fig. 17 shows the configuration of a power supply system 300 including a plurality of power supply devices 1 connected to two electric vehicles V, respectively. Regarding the configuration of the power supply device 1 included in the power supply system 300 of the twelfth embodiment, components common to the power supply device 1 of the first embodiment are assigned the same reference numerals, and detailed description thereof will be omitted.

[0130] In the twelfth embodiment, the control units 14 of the two power supply devices 1 each operate in an "independent operation mode" without recognizing that they are operating in parallel. However, by connecting the power cables 4 of the two power supply devices 1 combined in this way to the connection box 6, the power supply system 300 can function as a power supply system that provides high-output (20 kW) 280 V DC power from the connection box 6.

[0131] In the twelfth embodiment, the two power supply devices 1 operate independently of each other, so that operation of one power supply device 1 can be stopped, the electric vehicle V replaced with another fully charged electric vehicle V, and operation can be restarted. In this case, even though the output power from the connection box 6 may vary, power supply can be continued without interruption, making it possible to use the connection box 6 as a DC power source for a load that operates continuously in the event of a disaster. For example, if a load requires a 15 kW DC power supply, the first power supply device 1 may operate at 10 kW and the second power supply device 1 may operate at 5 kW with a time lag. When operating the power supply devices simultaneously in parallel, it is also possible to output 7.5 kW each, averaging the discharge from the storage battery of the electric vehicle V.

[0132] (Variation) FIG. 18 is a block diagram showing the configuration of a power supply device 1 according to a modification of the twelfth embodiment. In FIG. 18, instead of the junction box 6 of the twelfth embodiment, the load-side terminals 16 of the power supply devices 1 are connected to each other by a connection cable 5b. Specifically, the power supply device 1 includes two load-side terminals 16a and 16b. A power cable 4 connected to a load is connected to one load-side terminal 16a of the first power supply device 1, and a connection cable 5b connected to DC power from a second electric vehicle V and the power supply device 1 is connected to the other load-side terminal 16b. The connection cable 5b is connected to one load-side terminal 16a of the second power supply device 1, and outputs power to the first power supply device 1. Because the connection point is the load-side terminal 16 subsequent to the load-side DC circuit 132, the 280V DC power from the power cable 4 continues even when the load-side DC circuit 132 of one power supply device 1 is turned off. The two power supply devices 1 do not have two load-side terminals 16a, 16b, and any connection form is possible as long as they are connected at the rear stage of the DC / DC converter 13.

[0133] (Thirteenth embodiment) Fig. 19 is a block diagram showing the configuration of a power supply device 1 in the thirteenth embodiment. Fig. 19 shows the configuration of a power supply system 300 including a plurality of power supply devices 1 connected to two electric vehicles V, respectively. Of the configuration of the power supply device 1 in the thirteenth embodiment, the configuration common to the power supply device 1 in the first embodiment is assigned the same reference numerals, and detailed description thereof will be omitted.

[0134] In the thirteenth embodiment, the load-side power cables 4 connected to two power supply devices 1 are connected to a junction box 6c, each of which supplies DC power. The junction box 6c has multiple input terminals and one output terminal, and power lines are wired so that the DC power input to the multiple input terminals is combined into one. The junction box 6c also has an inverter 64 that converts DC power to AC power, and converts the combined DC power into three-phase AC power.

[0135] In the thirteenth embodiment, the control units 14 of the two power supply devices 1 each operate in an "independent operation mode" without recognizing that they are operating in parallel, and function as a device that provides DC power. However, by combining them with a connection box 6c as shown in Fig. 19, they can function as a power supply system 200 that provides three-phase AC power from the connection box 6c.

[0136] (Fourteenth embodiment) Fig. 20 is a block diagram showing the configuration of a power supply device 1 of the fourteenth embodiment. Fig. 20 shows the configuration of a power supply system 400 in which power is supplied from two power supply devices 1 connected in parallel. Of the configuration of the power supply device 1 included in the power supply system 400 of the fourteenth embodiment, the configuration common to the first embodiment is assigned the same reference numerals and detailed description thereof will be omitted.

[0137] It can function as a power supply system 400 that uses the storage battery of one electric vehicle V as a power source and branches out DC power for output.

[0138] (Fifteenth embodiment) In the second to fourteenth embodiments, the configuration has been described in which similarly configured power supply devices 1 are connected in parallel. However, DC power or three-phase AC output using the power supply device 1 can also be achieved by methods other than this. In the fourteenth embodiment, an extension unit 8 including at least a DC / DC converter 81 is combined with the power supply device 1.

[0139] 21 is a block diagram showing the configuration of a power supply system 500 according to the fifteenth embodiment. In the power supply system 500 according to the fifteenth embodiment, among the configurations of the power supply device 1, the configurations common to the configurations shown in the first embodiment or the third embodiment are assigned the same reference numerals, and detailed description thereof will be omitted.

[0140] The extension unit 8 has at least terminals 82 and 83 connectable to a DC / DC converter 81. Like the DC / DC converter 13 of the power supply device 1, the DC / DC converter 81 is an isolated converter that converts input DC power into DC power of a different voltage and outputs it. The terminal 82 is connected to the input of the DC / DC converter 13 of the power supply device 1, and the terminal 83 is connected to the output of the DC / DC converter 13 of the same power supply device 1 (the connection points correspond to connection terminals). Like the power supply device 1, the extension unit 8 may also have a control unit, an operation unit (such as buttons), an output unit (such as a display), and a switch. In this case, the control unit may recognize a user operation on the operation unit and control operations such as start / stop when it is confirmed by the switch that a cover provided on the housing of the extension unit 8 is not open.

[0141] By providing an inverter that converts DC power into AC power at the downstream of the contact point connected to the extension unit 8, it is also possible to output AC power.

[0142] With the configuration shown in the fifteenth embodiment, by using the power supply device 1 combined with the expansion unit 8 provided with at least a DC / DC converter 81, it is possible to easily configure a power supply system 500 that provides high-output DC power or three-phase AC power using the storage battery of the electric vehicle V as a power source.

[0143] (16th embodiment) 22 is a block diagram showing the configuration of a power supply system 500 according to the sixteenth embodiment. As in the fifteenth embodiment, the power supply system 500 according to the sixteenth embodiment is configured by connecting in parallel a power supply device 1 and an extension unit 8 including at least a DC / DC converter 81.

[0144] A power supply system 500 of the sixteenth embodiment uses two electric vehicles V as a power source. An extension unit 8 has a DC / DC converter 81 and a power source side terminal 84. The power source side terminal 84 is connectable to a power cable 3 that is connected to a storage battery of the electric vehicle V. The power source side terminal 84 is connected to the DC / DC converter 81 via a power source side direct current circuit 811 that includes a relay.

[0145] As shown in the sixteenth embodiment, by using the power supply device 1 combined with the expansion unit 8 provided with the DC / DC converter 81, it is possible to easily configure a power supply system 500 that provides high-output DC power or three-phase AC power using the storage batteries of two electric vehicles V as a power source.

[0146] (17th embodiment) 23 is a block diagram showing the configuration of a power supply system 500 according to the seventeenth embodiment. As in the fifteenth embodiment, the power supply system 500 according to the seventeenth embodiment is configured by connecting in parallel a power supply device 1 and an extension unit 8 including at least a DC / DC converter 81.

[0147] A power supply system 500 of the seventeenth embodiment uses one electric vehicle V as a power source and branches and outputs power to two loads. The extension unit 8 has a DC / DC converter 81 and a load-side terminal 85. The load-side terminal 85 is connected to a power cable 4 that is connected to the load. The load-side terminal 85 is connected to the DC / DC converter 81 via a load-side DC circuit 812 that includes a relay.

[0148] As shown in the seventeenth embodiment, by using a power supply device 1 combined with an expansion unit 8 provided with a DC / DC converter 81, it is possible to easily configure a power supply system 500 that branches and provides high-output DC power powered by the storage battery of one electric vehicle V.

[0149] The extension units 8 shown in the fifteenth to seventeenth embodiments are applicable to the various power supply systems shown in the third to fourteenth embodiments.

[0150] The embodiments disclosed above are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0151] 1 Power supply device 12 Power side terminal 13 DC / DC converter 14 Control Unit 16 Load side terminal 3,4 Power cables 31 Plug 6, 6a, 6b Junction box V Electric Vehicle

Claims

1. a DC / DC converter that converts the supplied DC power into DC power of a different voltage value; a power supply side terminal connected to a DC power supply that supplies DC power to the DC / DC converter; a load-side terminal to which the converted DC power output from the DC / DC converter is applied and which is connected to a load; a power supply side DC circuit including a relay provided between the power supply side terminal and the DC / DC converter; a load-side DC circuit including a relay provided between the load-side terminal and the DC / DC converter; a control unit that controls the on and off of the relay; is housed in a trunk-type housing, a switch that detects whether a cover provided on the housing is open or closed; The control unit turns off the relays of the power supply side DC circuit and the load side DC circuit when the cover is open. Power supply device.

2. The power supply side connection terminal further includes a power supply side connection terminal for branching and outputting the power supplied from the DC power supply. The power supply device according to claim 1 .

3. The power supply side connection terminal is an inlet The power supply device according to claim 2 .

4. Power from the DC power supply is branched and output to a power supply terminal of another power supply device via a power cable connected to the power supply side connection terminal. The power supply device according to claim 2 .

5. The power supply side terminal is connected to a power supply side connection terminal of another power supply device via a power cable connected to the power supply side terminal. The power supply device according to claim 2 .

6. The DC / DC converter further includes a load-side connection terminal that receives DC power output from another DC / DC converter and is connected to the load-side terminal. The power supply device according to any one of claims 1 to 5.

7. The control unit The control is performed in either a first operation mode in which processing based on a predetermined sequence is performed between an on-board charge / discharge control device that controls charging / discharging of a storage battery provided in an electric vehicle to use the storage battery as the DC power source and the power supply device, or a second operation mode in which processing based on the predetermined sequence is omitted. The power supply device according to claim 2 or 6.

8. an operation unit that accepts selection of either the first operation mode or the second operation mode; The control unit executes control in the mode selected by the operation unit. The power supply device according to claim 7.

9. The power supply further includes an inverter that converts the DC power output from the DC / DC converter into three-phase AC power. The power supply device according to any one of claims 1 to 7.

10. an electric vehicle having a storage battery and an on-board charge / discharge control device for controlling charging and discharging of the storage battery; The power supply device according to claim 1 , DC power from the storage battery of the electric vehicle is branched to the DC / DC converter of the power supply device, and DC power output from the DC / DC converters of the plurality of power supply devices is output to a load. Power supply system.

11. The power supply further includes a connection box including a plurality of terminals and a terminal connected to the plurality of terminals via a power line, DC powers output from the plurality of power supply devices are input to the plurality of terminals, and a combined DC power of the DC powers is output from the one terminal of the connection box. The power supply system according to claim 10.

12. The connection box further includes an inverter that combines DC power input to the plurality of terminals and converts it into three-phase AC power, and the one terminal is a terminal that outputs the three-phase AC power. The power supply system according to claim 11.

Images