Independent power supply unit

Abstract

To provide an independent power supply device that can be charged from a mobile power supply and can prevent excessive power extraction.SOLUTION: An independent power supply device has: a private power generation facility 2 that comprises a photovoltaic power generation device 2a and a wind power generation device 2b; an accumulator battery 3 to be charged with a generated power by the private power generation facility 2; a DC / AC inverter 7 that converts an output of the accumulator battery 3 into an AC power; a charge and discharge controller 4 that controls charge and discharge of the accumulator battery 3; and a charging connector 5 for extracting power from an electric vehicle (EV) 8 to charge the accumulator battery 3. The charge and discharge controller 4, when the charging connector 5 is connected with the EV 8, starts extraction of power and communicates with the EV 8 via the charging connector 5 to acquire information on remaining storage power, and when the remaining storage power becomes a specified value, terminates the extraction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an independent power supply device that charges a storage battery with power generated by utilizing natural energy such as solar power or wind power, and supplies the charged stored power to a load. [Background technology]

[0002] Conventionally, there have been independent power supply devices that are not connected to a commercial power supply (for example, see Patent Document 1). Most of the independent power supply devices generate electricity using natural energy such as solar power or wind power, store the electricity in a storage battery, and use the stored electricity as the power source for various displays or campsites, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-25481 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned conventional independent power supply units were effective because they could supply power to electrical equipment even in mountainous areas such as campsites where commercial electricity was not available, and could also supply power to charge mobile phones and for lighting in the event of a power outage during a disaster. However, when the stored power runs out, the only option is to wait for charging via solar power generation or the like, making it difficult to use the device in a stable state.

[0005] To solve this problem, it is thought that an effective way to ensure stable use would be to receive power from a mobile power source such as an electric vehicle to restore the stored electricity. However, if the vehicle supplying the electricity does not leave a certain amount of electricity in reserve, it will be unable to travel to its next destination, so it is necessary to limit the amount of electricity it discharges. In addition, when a disaster occurs, it is conceivable that the stored power of many independent power supply devices will be depleted all at once, requiring charging, so it is undesirable for charging from mobile power supply means such as electric vehicles to be concentrated in favor of certain independent power supply devices.

[0006] SUMMARY OF THE PRESENT DISCLOSURE In view of the above problems, an object of the present invention is to provide an independent power supply device that allows charging from a mobile power source and prevents excessive drawing. [Means for solving the problem]

[0007] In order to solve the above problems, the invention of claim 1 is an independent power supply device comprising a private power generation facility equipped with at least one of a solar power generation facility and a wind power generation facility, a built-in storage battery that is charged with power generated by the private power generation facility, and a power conversion unit that converts a direct current output of the built-in storage battery into alternating current power, and supplies power to an electrical device driven by commercial power, the independent power supply device further comprising a charge / discharge control unit that controls charging and discharging of the built-in storage battery, and a charging connector for extracting power from a battery of an electric vehicle and charging the built-in storage battery, the charge / discharge control unit starting extraction of power when the charging connector is connected to the electric vehicle, and communicating with the electric vehicle via the charging connector to obtain information on the remaining amount of stored power in the battery, and stopping extraction when the remaining amount of stored power reaches a specified value. In addition to the control, the amount of power taken out is measured, and once a certain amount of power has been taken out, it is automatically shut down without waiting for the remaining battery level to reach a specified value. The present invention is characterized by the implementation of control to terminate removal. According to this configuration, even when power is drawn from the battery of the electric vehicle, the drawing is terminated when a certain amount of power remains, thereby preventing excessive drawing and allowing the electric vehicle to then continue on to another destination.

[0008] Furthermore, When the amount of power extracted from the electric vehicle reaches a predetermined amount, the extraction is stopped, so that the electric vehicle can then contribute to the charging of other independent power supply devices, preventing charging from being concentrated in a particular independent power supply device.

[0009] Claim 2 The invention is as follows: 1In the configuration described above, the specified value is an amount of power that enables the electric vehicle to travel 5 to 100 km. With this configuration, even after the extraction of power has finished, the electric vehicle can travel 5 to 100 km using the remaining power stored in the battery, allowing the driver to return home, etc., and power can be supplied to the independent power supply device with peace of mind. Effect of the Invention

[0011] According to the present invention, even when power is drawn from the battery of an electric vehicle, the drawing is terminated when a certain amount of power remains, thereby preventing excessive drawing and allowing the electric vehicle to then continue on to another destination. In addition, when drawing power from an external storage battery, the drawing is stopped after a certain amount of power has been drawn, which makes it possible to prevent a situation in which charging from the outside is concentrated in a specific independent power supply device. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a first embodiment of an independent power supply device according to the present invention. [Diagram 2] 4 is a flowchart showing a flow of charging from a vehicle. [Diagram 3] 6 is a flowchart showing a second embodiment of the independent power supply device, illustrating a flow of charging from an external storage battery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings. Fig. 1 is a block diagram showing a first embodiment of an independent power supply device according to the present invention. As shown in Fig. 1, the independent power supply device 1 includes a private power generation facility 2 including a solar power generation device 2a and a wind power generation device 2b, a storage battery 3, a charge / discharge control unit 4, a charging connector 5 as a connection means for extracting power from an electric vehicle, a switching unit 6 for switching the charging power source, and a DC / AC inverter 7 for outputting 100V AC power. Reference numeral 8 denotes an electric vehicle (EV), which is an electric vehicle to which the charging connector 5 is connected.

[0014] The photovoltaic power generation device 2a converts direct current generated by the solar panel to a specified direct current voltage using a built-in DC / DC converter, outputs the converted voltage, and supplies it to and charges the storage battery 3. The wind power generation device 2b converts alternating current power generated by the rotation of the blades caused by the wind to a specified direct current voltage using a built-in AC / DC converter, and supplies it to and charges the storage battery 3. The power of the charged storage battery 3 is converted to 100V AC power by the DC / AC converter 7 and is supplied to a load (not shown) for use. In addition, if the system is equipped with lighting or a security camera, the power is used to drive these devices. Although the solar power generation system 2a and the wind power generation system 2b are provided, only one of them may be provided.

[0015] Normally, the independent power supply 1 functions sufficiently by storing the self-generated electricity in the storage battery 3 and outputting the stored electricity, but in the event of a large-scale power outage due to a disaster or the like, the independent power supply 1 must be relied upon and must be kept in a state where it can supply electricity. Therefore, in addition to the in-house power generation, the vehicle is equipped with a function of receiving power from an external power source such as an electric vehicle to charge the storage battery 3. When the charging connector 5 is connected to the charging port of the electric vehicle, power is drawn from the electric vehicle to charge the storage battery 3.

[0016] A specific description will be given below. Fig. 2 is a charging flowchart for taking out electric power from an EV8, which is an electric vehicle, and the description will be given based on Fig. 2. When the charging connector 5 is connected to the EV 8 (S1), the charging / discharging control unit 4 recognizes this and starts communication with the EV 8 (S2). At this time, the charging / discharging control unit 4 starts communication with the EV 8 via the charging connector 5 based on the quick charger communication standard (CHAdeMO).

[0017] When communication with the EV 8 is established (S3), the connection of the switching unit 6 is switched from the private power generation facility to the EV (S4), and the extraction of power from the battery of the EV 8 begins (S5). While power is being drawn, communication with the EV8 continues to be performed to obtain remaining battery charge information (information on remaining stored power) (S6), and when the remaining battery charge falls to a specified value (predetermined amount of power) (Yes in S7), drawing is terminated (S8). Note that the default value is preset to be, for example, the amount of power that would enable the EV8 to travel approximately 50 km. When the extraction of electric power is completed, the switching unit 6 switches to the private power generation facility 2 (S9), and the control ends.

[0018] In this way, even if power is drawn from the EV8's battery to charge the storage battery 3 of the independent power supply unit 1, the drawing is terminated with a certain amount of power remaining, preventing excessive drawing and allowing the EV8 to then continue on to another destination.

[0019] Although the above description is based on the case where the electric vehicle is an EV8, the power extraction control can be performed in the same way for a PHV (Plug-in Hybrid Vehicle). The amount of power to be left (prescribed value) is set to an amount of power that can travel 50 km, but it is sufficient if the vehicle can be driven to a place where the driver can return home or where the vehicle can be charged, and the drivable distance can be set between 5 km and 100 km. By leaving this amount of power, the driver can rest assured that power can be provided to the independent power supply device 1.

[0020] FIG. 3 shows a second embodiment of the independent power supply device 1, and shows a flowchart of charging control when power is taken from a vehicle other than an electric vehicle, such as a truck that simply carries a storage battery for supplying power to the outside. 1 in that a charging terminal (not shown) is provided as a connection means without any communication function and only electrically connects to an external storage battery, instead of the charging connector 5. Other block configurations are the same, so a description of the block configurations will be omitted.

[0021] If the target for extracting power is a simple storage battery rather than an electric vehicle such as an EV8, communication is not possible via the charging connector 5, and therefore the amount of power extracted cannot be managed. In such a case, charging of the built-in storage battery 3 is performed according to the flow shown in Figure 3. Figure 3 shows the flow of extracting power from a storage battery loaded on a truck.

[0022] First, when the switching unit 6 is switched from the private power generation facility 2 to the charging terminal side and the charging terminal of the independent power supply device 1 is connected to a predetermined battery connection of the truck (S11), the charge / discharge control unit 4 recognizes this and starts drawing power (S12). Then, it measures the amount of power being drawn (S13). When the amount of power extracted reaches a preset amount (Yes in S14), extraction from the truck is terminated (S15). When this is completed, the switching unit 6 is switched to the private power generation facility 2 under the control of the charge / discharge control unit 4 (S16), and the control is terminated.

[0023] In this way, even if power is drawn from an external storage battery, the drawing is stopped after a certain amount of power is drawn, so that a situation in which charging from the outside is concentrated in a specific independent power supply device 1 can be prevented.

[0024] In the above embodiment, the independent power supply devices are separate for drawing power from an electric vehicle such as an EV8 and drawing power from a vehicle simply equipped with a storage battery, but a single independent power supply device may be provided with both the charging connector 5 and the charging terminal shown in the second embodiment. In this case, it is preferable because the connection destination can be arbitrary. In the first embodiment, power is drawn until the remaining battery charge reaches a specified value, but the amount to be drawn may be specified as in the second embodiment, and the drawing may be stopped when a specified amount of power has been drawn before the remaining battery charge reaches the specified value. In this case, the amount of power drawn from one unit will be less, but the EV8 can then contribute to charging other independent power supplies 1, preventing charging from being concentrated in a particular independent power supply 1. [Explanation of symbols]

[0025] 1... Independent power supply device, 2... Private power generation equipment, 2a... Photovoltaic power generation device, 2b... Wind power generation device, 3... Storage battery (built-in storage battery), 4... Charge / discharge control unit, 5... Charging connector, 6... Switching unit, 7... DC / AC inverter (power conversion unit),

Claims

1. An independent power supply device comprising: a private power generation facility equipped with at least one of a solar power generation facility and a wind power generation facility; a built-in storage battery that is charged with power generated by the private power generation facility; and a power conversion unit that converts a direct current (DC) output of the built-in storage battery into alternating current (AC) power; and supplies power to an electrical device that is driven by commercial power, a charge / discharge control unit that controls charging / discharging of the built-in storage battery; a charging connector for extracting electric power from a battery of an electric vehicle to charge the built-in storage battery, When the charging connector is connected to the electric vehicle, the charging / discharging control unit starts drawing electric power, communicates with the electric vehicle via the charging connector to obtain information on the remaining amount of stored power in the battery, and controls to end the drawing when the remaining amount of stored power reaches a specified value. An independent power supply device characterized by measuring the amount of power drawn and, once a predetermined amount of power has been drawn, carrying out control to end drawing without waiting for the remaining charge to reach the specified value.

2. 2. The independent power supply device according to claim 1, wherein the specified value is an amount of electric power that enables an electric vehicle to travel 5 to 100 km.

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