JP2011166928A - Power supplying device including back-feed function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply power to a wireless communication unit even if power failure occurs in a system power supply. <P>SOLUTION: A power supplying device 2 includes a charge unit 9 for supplying power to a battery 8 mounted on an electric vehicle 1 from the system power supply 7, and attaches the wireless communication unit 6 for transmitting and receiving a variety of information. The power supplying device includes: a power conversion unit 10 for converting power from the battery 8 of the electric vehicle 1; a power failure detection unit 11 for detecting that power supply to the charge unit 9 has been interrupted in power failure of the system power supply 7; and a change unit 12 for changing between power supply from the system power supply 7 to the wireless communication unit 6 and power supply from the battery 8 to the wireless communication unit 6. In the power failure of the system power supply 7, back-feed from the battery 8 to the wireless communication unit 6 is achieved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply device with a reverse power supply function including, for example, a power supply function for charging a battery mounted on an electric vehicle, and a reverse power supply function for outputting power stored in the battery to the outside when a power failure occurs in a system power supply. .

  In recent years, plug-in hybrid vehicles and electric vehicles equipped with a battery as an energy source have been developed as an alternative to gasoline vehicles equipped with an internal combustion engine due to environmental problems such as global warming. In the case of these electric vehicles, the battery must be charged because it is necessary to continue traveling. Therefore, for the purpose of spreading the use of these electric vehicles, the development of a power supply infrastructure for charging the battery is being promoted.

  Along with the widespread use of these electric vehicles, power supply devices for charging batteries of electric vehicles will be installed in various places such as urban areas. The user of the electric vehicle must move to any place such as an urban area and charge the battery of the electric vehicle with a power supply device installed in the place.

  2. Description of the Related Art Conventionally, a power supply system has been proposed in which communication means is provided to exchange information between a power supply apparatus and an electric vehicle on which a battery that receives power supply from the power supply apparatus is mounted (see, for example, Patent Document 1). .

  The power supply system in Patent Document 1 includes a power supply device (power supply terminal) installed in a power supply station that can park a vehicle (a facility that supplies power to a vehicle in the same manner as a gasoline station that supplies gasoline to a vehicle), The main part is composed of a management system that manages the supply of power by the power supply apparatus, and a network that enables transmission and reception of information by connecting the power supply apparatus and the management system.

  In this power supply system, a user parks an automobile at a predetermined place on a power supply stand and connects a battery to the power supply apparatus. By inserting an authentication card such as an IC card into a card reader of an authentication device provided in the automobile, user information written on the authentication card is transmitted to the management system via the network.

  In this management system, it is compared with user information registered in the user database, and it is determined whether or not this user is qualified to receive power supply. As a result of this determination, when the user is authenticated, the power supply device is controlled based on a power supply start command from the management system to supply power to the vehicle battery.

  When the power supply device is removed from the battery after the end of power supply, the power usage amount is read from the power supply device, the power supply end notification and the power usage amount are transmitted to the management system, and the information is stored in the history database.

JP 2008-77267 A

  By the way, in the power supply system in Patent Document 1 described above, information is transmitted and received between the power supply apparatus installed in the power supply stand and the management system. The information is transmitted and received by public communication such as a public wireless LAN. This can be achieved by attaching a wireless communication device constituting the line to the power feeding device.

  The wireless communicator attached to this power supply device is normally supplied with power from the system power supply. However, if the system power supply fails due to a lightning strike or other disaster, the above-mentioned wireless communicator is also shut down due to the power outage of the system power supply. Then, there was a problem that communication was impossible.

  Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide reverse power feeding that can secure power supply to the wireless communication device even when a power failure occurs in the system power supply. The object is to provide a power supply device with a function.

  As a technical means for achieving the above-described object, a power supply device with a reverse power supply function according to the present invention includes a charging unit that supplies power from a system power supply to a battery mounted on an electric vehicle, and transmits and receives various types of information. A power supply device provided with a wireless communication means for detecting the power supply to the power conversion unit for converting the power from the battery of the electric vehicle and the power failure detection to detect that the power supply to the charging unit is interrupted when the system power supply is interrupted And a switching unit that switches between power supply from the system power supply to the wireless communication means and power supply from the battery to the wireless communication means, enabling reverse power feeding from the battery to the wireless communication means when the system power supply fails It is characterized by that.

  In the present invention, a power conversion unit that converts power from the battery of the electric vehicle, a power failure detection unit that detects that power supply to the charging unit is interrupted during a power failure of the system power source, and the system power source to the wireless communication means A switching unit that switches between power supply from the battery and power supply from the battery to the wireless communication means, and enables reverse power supply from the battery to the wireless communication means when the system power supply fails. Even if it occurs, the power supply to the wireless communication device can be secured, and the reliability of the power supply apparatus can be improved.

  The electric vehicle according to the present invention preferably includes a reverse power supply terminal to which a cable for outputting the electric power stored in the battery to the outside is connected. In this way, reverse power feeding from the battery to the wireless communication means can be realized by a simple means at the time of power failure of the system power supply.

  The power conversion unit in the present invention can be configured by a DC-AC converter that converts a DC voltage of a battery into an AC voltage, or a DC-DC converter that steps up and down the DC voltage of the battery to a desired voltage. If it does in this way, at the time of the electric power supply from a battery to a radio | wireless communication apparatus, AC / DC conversion and a transformation can be performed easily.

  According to the present invention, a power conversion unit that converts power from a battery of an electric vehicle, a power failure detection unit that detects that power supply to a charging unit is interrupted when a power failure occurs in the system power source, and wireless communication from the system power source A switching unit that switches between supplying power to the means and supplying power from the battery to the wireless communication means, and enabling reverse power feeding from the battery to the wireless communication means in the event of a power failure of the system power supply. Even if a power failure occurs, power supply to the wireless communication means can be ensured, and the reliability of the power supply apparatus can be improved.

It is a schematic structure of the electric power feeder with a reverse electric power feeding function in embodiment of this invention, and is a figure which shows the electric power feeding state to a battery. It is a schematic structure of the electric power feeder with a reverse electric power feeding function in embodiment of this invention, and is a figure which shows the reverse electric power feeding state from a battery. FIG. 2 is an overall schematic configuration diagram of a power feeding system including the power feeding device with a reverse power feeding function in FIG. 1.

  An embodiment of a power feeding device with a reverse power feeding function according to the present invention will be described in detail below. In the following embodiments, the present invention is applied to a power supply device installed in a power supply station (a facility that supplies power to a car in the same manner as a gasoline station that supplies gasoline to a car) that can park a car in various places such as an urban area. However, this power supply device is used in parking lots attached to apartment buildings such as monthly contract parking lots and condominiums, coin parking lots that do not have a billing machine using parking tickets, shopping malls and hotels. It is possible to apply also to what was installed in the parking lot.

  1 and 2 show a schematic configuration of a power feeding device 2 with a reverse power feeding function in the power feeding system of the electric vehicle 1, and FIG. 3 shows an overall configuration of a power feeding system including the power feeding device 2 with a reverse power feeding function.

  As shown in FIG. 3, the power supply system includes a power supply device 2 installed in a power supply stand for supplying power to a battery mounted on the electric vehicle 1, a power supply service provider, and a power supply device 2. And a power supply server 5 that performs transmission / reception between them via the communication network 4.

  The power feeding device 2 performs transmission / reception with the power feeding server 5 by attaching a wireless communication device 6 constituting a public communication line such as a public wireless LAN. The power supply server 5 stores a personal information database in which personal information of the user is stored, and whether or not the user of the power supply apparatus 2 is qualified to receive power supply based on the personal information extracted from the personal information database. Determine whether. As the communication network 4, the Internet or a mobile phone network can be used.

  When the user of the electric vehicle 1 uses the power supply device 2, the power supply server 5 specifies the user who uses the power supply device 2 in response to a user power supply request. That is, the user requests power supply from the power supply apparatus 2 to the power supply server 5. On the other hand, based on the information transmitted from the power supply device 2, the power supply server 5 identifies the user by user authentication based on a user ID or the like that the user has signed a contract with the power supply service provider. Based on the user's specification, charging of the battery of the electric vehicle 1 by the power supply device 2 is started by a command from the power supply server 5.

  On the other hand, as shown in FIG. 1, the power feeding device 2 includes a charging unit 9 that supplies power from a system power supply 7 to a battery 8 mounted on the electric vehicle 1, and serves as a wireless communication unit for transmitting and receiving various types of information. A power communication unit 10 with a wireless communicator 6 and a power conversion unit 10 that converts power from the battery 8 of the electric vehicle 1 and a power failure that detects that the power supply to the charging unit 9 is interrupted when the system power supply 7 is powered off A detection unit 11 and a switching unit 12 that switches between power supply from the system power supply 7 to the wireless communication device 6 and power supply from the battery 8 to the wireless communication device 6 are provided. A reverse power supply function that enables reverse power supply to the wireless communication device 6 is provided. The charging unit 9 is composed of an AC-DC converter in order to convert the AC voltage from the system power supply 7 into a DC voltage.

  The power conversion unit 10 includes a DC-AC converter that converts the DC voltage of the battery 8 into an AC voltage to drive the wireless communication device 6. As a result, an AC voltage can be supplied to the wireless communication device 6. Note that a DC-DC converter may be used when the DC voltage of the battery 8 needs to be boosted to a desired voltage. The switching unit 12 uses a mechanical switch that switches between the system power supply side contact 12a and the power conversion unit side contact 12b. However, a semiconductor switch may be used.

  Moreover, the electric vehicle 1 has a power feeding terminal 13 to which a cable for charging the battery 8 is connected, and a reverse power feeding terminal 14 to which a cable for outputting the electric power stored in the battery 8 to the outside is connected. I have. Thereby, reverse power feeding from the battery 8 to the wireless communication device 6 can be realized by a simple means at the time of power failure of the system power supply 7. Note that the connecting line 15 that connects the charging unit 9 of the power supply device 2 and the battery 8 of the electric vehicle 1 via the power supply terminal 13, the battery 8 of the electric vehicle 1, and the power conversion unit 10 of the power supply device 2 are connected to the reverse power supply terminal 14. The connection line 16 connected via the cable can be constituted by a single cable 17.

  In the power feeding device 2 with the reverse power feeding function, the battery 8 of the electric vehicle 1 is normally charged by the charging unit 9 by supplying power from the system power source 7, and the system power source side contact 12a of the switching unit 12 as shown in FIG. The wireless communication device 6 is driven by the system power supply 7 via the. Here, when the power supply from the system power supply 7 to the power supply device 2 is stopped due to a disaster such as an earthquake or a lightning strike, the battery 8 of the charging electric vehicle 1 connected to the power supply device 2 is used as an emergency power supply. Then, the wireless communication device 6 is driven by the charging voltage of the battery 8.

  That is, at the time of a power failure of the system power supply 7, the power failure detection unit 11 detects that the power supply from the system power supply 7 to the charging unit 9 is cut off, and as shown in FIG. 12 is switched to the power conversion unit side contact 12b. As a result, the DC voltage charged in the battery 8 of the electric vehicle 1 is converted into AC by the power conversion unit 10, and the AC voltage is supplied to the wireless communication device 6. The wireless communication device 6 is driven by reverse power feeding from the battery 8 to the wireless communication device 6. Thereby, even if the power failure of the system power supply 7 occurs, the power supply to the wireless communication device 6 can be secured, and the reliability of the power supply device 2 can be improved.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Electric power feeder 6 Wireless communication means (wireless communication device)
7 System power supply 8 Battery 9 Charging part 10 Power conversion part 11 Power failure detection part 12 Switching part 14 Reverse feed terminal

Claims (4)

  A power supply device that includes a charging unit that supplies power from a system power source to a battery mounted on an electric vehicle, and that includes wireless communication means for transmitting and receiving various types of information, and converts power from the battery of the electric vehicle A power conversion unit; a power failure detection unit that detects that power supply to the charging unit is interrupted at the time of a power failure of the system power supply; power supply from the system power source to the wireless communication unit; and wireless communication unit from the battery A power supply apparatus with a reverse power supply function, comprising: a switching unit that switches between power supply to the power supply and reverse power supply from the battery to the wireless communication means during a power failure of the system power supply.   The power supply device with a reverse power supply function according to claim 1, wherein the electric vehicle includes a reverse power supply terminal to which a cable for outputting electric power stored in a battery to the outside is connected.   The power supply unit with a reverse power supply function according to claim 1, wherein the power conversion unit includes a DC-AC converter that converts a DC voltage of a battery into an AC voltage.   The power supply unit with a reverse power supply function according to claim 1 or 2, wherein the power conversion unit includes a DC-DC converter that steps up and down a DC voltage of a battery to a desired voltage.

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