JP2013255360A - Charge/discharge apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge/discharge apparatus capable of supplying electric power charged in an electric vehicle having an energy storage function to households when commercial power supply is stopped.SOLUTION: A charge/discharge device 3 which charges/discharges an electric vehicle having an energy storage function, includes a charge/discharge device control section 42 which controls discharge of an electric car 2 by means of supplied electric power, and an auxiliary battery 47 which starts supply of electric power to a charge/discharge device control section 42 at a moment when supply of electric power from an electric power system 7 to the charge/discharge device control section 42 is stopped.

Description

  The present invention relates to a charge / discharge device that charges and discharges an electric vehicle having a power storage function.

  In recent years, movements to utilize the power storage function of electric vehicles such as electric vehicles (EV) and hybrid vehicles (HEV) have started to become active. When the power system fails in the event of an emergency such as an earthquake disaster, the power stored in the secondary battery used in the electric vehicle or the like is supplied to the home or power grid. Such an electric vehicle is expected not only as a moving means but also as a role for securing electric power at the time of disaster or power failure.

  In consideration of such a situation, a home power supply system that can supply electric vehicle power to load equipment in the home when the power system fails in an emergency such as an earthquake has been proposed (for example, a patent) Reference 1). In this system, it is possible to supply electric power from the vehicle storage battery to the electrical home appliance in an emergency such as a power failure.

  In addition, there has been proposed a charging system capable of accurately performing charging control between a charger and an electric vehicle when a power failure occurs during charging of the in-vehicle battery (see, for example, Patent Document 2). In this charging system, the electric vehicle supplies the control power output from the auxiliary battery to the charger via the vehicle-side connector as control power for power failure. When the AC power supply fails, the charger switches the control power source for the charger control / communication system from the control power source to the auxiliary battery of the electric vehicle, and communicates with the electric vehicle to communicate with the electric vehicle. Perform the charge termination procedure. For this reason, even when a power failure occurs during charging of the in-vehicle battery, the charging control between the charger and the electric vehicle can be performed accurately. By using the control power source on the electric vehicle side at the time of a power failure, it is not necessary to separately install a backup battery on the charger side, so that the manufacturing cost of the charger can be suppressed.

Japanese Patent Laid-Open No. 11-178234 (published July 2, 1999) JP 2010-239850 A (released on October 21, 2010)

  In the domestic power supply system of Patent Document 1, in order to supply electric vehicle power to a load device in the home at the time of a power failure of the power system, power must be supplied to a charger / discharger connected to the electric vehicle. Don't be. However, the charger / discharger is supplied with electric power from a household power source, and the power supply to the charger / discharger is stopped during a power failure. For this reason, means for supplying power to the charger / discharger at the time of a power failure is essential, but the means is not described in Patent Document 1.

  On the other hand, in the charging system disclosed in Patent Literature 2, the electric vehicle supplies the control power output from the auxiliary battery to the charger via the vehicle-side connector as power for blackout control. For this reason, at the time of a power failure, the electric power supply to a charger can be ensured. However, the control power line for supplying the above control power from the electric vehicle side to the charger / discharger side is used only at the time of a power failure. Such a control power line must be provided in both the electric vehicle and the charger / discharger, resulting in an increase in manufacturing costs of the electric vehicle and the charger / discharger.

  The objective of this invention is providing the charging / discharging apparatus which can supply the electric power charged by the electric vehicle which has an electrical storage function to a household etc. at the time of a power failure of commercial power.

  A charging / discharging device according to the present invention is a charging / discharging device that charges / discharges an electric vehicle having a power storage function, and uses a supplied electric power to control discharge of the electric vehicle, and from a main power source, And an auxiliary power source that starts supplying auxiliary power to the control unit starting from the timing of stopping the main power supply when main power supply to the control unit is stopped.

  In the above configuration, if the main power is supplied from the main power source, the control unit uses the main power to control the discharge of the electric vehicle and supply the electric power discharged from the electric vehicle to a home or the like. Can do.

  However, when the main power supply from the main power supply stops, the control unit cannot control the discharge of the electric vehicle unless there is an alternative power supply.

  According to the above configuration, even when the power supply from the main power supply is stopped, the auxiliary power supply to the control unit can be started from the stop timing.

  Therefore, the control unit can receive the auxiliary power supply instead of the main power supply, and therefore can control the discharge of the electric vehicle even during a power failure of the main power supply.

  Therefore, at the time of a power failure of the main power source, it is possible to control the discharge of the electric vehicle and supply the electric power discharged from the electric vehicle to a home or the like.

  In the charging / discharging device, the auxiliary power supply further supplies auxiliary power to the control unit starting from the discharge power supply start timing when supply of discharge power from the electric vehicle to the control unit is started. It is preferable to stop.

  In the charging / discharging device, the control unit uses the auxiliary power to discharge the electric vehicle at least from the main power supply stop timing to the discharge power supply start timing. It is more preferable to have a power capacity that can be controlled.

  According to the above configuration, the auxiliary power supply supplies power to the control unit during a period from when supply of main power from the main power supply is stopped to when supply of discharge power from the electric vehicle is started. That is, the auxiliary power supply has a power capacity that enables the control unit to control the discharge of the electric vehicle at least from the timing of stopping the power supply from the main power supply to the timing of starting the power supply from the electric vehicle. It will be good if you do.

  Therefore, it is possible to reduce the capacity of the auxiliary power source, and thus reduce the manufacturing cost of the charge / discharge device.

  The charging / discharging device preferably further includes a setting unit that sets a power supply path for supplying power to the control unit from one of the main power source, the auxiliary power source, and the electric vehicle.

  According to the above configuration, it is possible to set a power supply path for supplying power from one of the main power supply, the auxiliary power supply, and the electric vehicle to the control unit.

  In the charging / discharging device, the setting unit includes a first power supply line that connects between the auxiliary power supply and the control unit, and the power supply path is configured such that the main power supply supplies the main power to the first power supply line. When the electric vehicle supplies power to the first power supply line, the main power is supplied to the control unit instead of the auxiliary power from the auxiliary power supply. It is preferable that the setting unit sets the discharge power to supply power to the control unit instead of the auxiliary power from the auxiliary power source.

  According to the above configuration, when the main power supply feeds the main power to the first feed line and when the electric vehicle feeds the discharge power to the first feed line, each power is controlled by the control unit instead of the auxiliary power. In other cases, auxiliary power can be supplied to the control unit.

  In the charging / discharging device, the setting unit may include a second feeding line connected to the main power source, a third feeding line connected to the electric vehicle, and the first feeding line or the third feeding line. A connection portion connected to a feeder line, wherein the voltage value of the auxiliary power is lower than each voltage value of the main power and the discharge power, and the connection portion starts from the timing of stopping the main power feeding. It is preferable that the third power supply line is connected to the first power supply line.

  In the charging / discharging device, it is preferable that when the main power supply stop is detected, the control unit connects the third power supply line to the first power supply line using the connection unit.

  In the charging / discharging device, it is preferable that the control unit detects a change in voltage value from the voltage value of the main power to the voltage value of the auxiliary power as the main power supply stop.

  In the charge / discharge device, it is preferable that the control unit further includes a monitoring unit that monitors whether the main power is output from the main power source.

  In the charging / discharging device, the power supply is connected between the main power source and the second power supply line, and converts between the main power converter that converts the main power into power, the electric vehicle, and the third power supply line. It is preferable to further include a discharge power converter that is connected and converts the discharge power.

  In the charging / discharging device, the setting unit includes a second power supply line connected to the main power source, a third power supply line connected to the electric vehicle, and the first power supply line and the second power supply line. Is connected between the first rectifying element that flows current in a direction from the second feeder to the first feeder, and between the first feeder and the third feeder, A second rectifying element that flows current in a direction from the third feeder to the first feeder, and the voltage value of the main power, the voltage value of the discharge power, and the voltage value of the auxiliary power are In order, it is preferable to be lower.

  The charging / discharging device further includes a discharge power converter that is connected between the electric vehicle and the third power supply line and converts the discharge power into power, and the discharge power converter is controlled by the control unit. It is preferable to control whether or not it performs power conversion.

  The charging / discharging device preferably further includes a main power converter that is connected between the main power source and the second power supply line and converts the main power.

As described above, the charging / discharging device according to the present invention is a charging / discharging device that charges / discharges an electric vehicle having a power storage function,
A controller that controls the discharge of the electric vehicle using the supplied electric power;
And an auxiliary power source that starts supplying auxiliary power to the control unit starting from the timing of stopping the main power supply when main power supply from the main power source to the control unit is stopped.

  Therefore, there is an effect that the electric power charged in the electric vehicle having the power storage function can be supplied to a home or the like at the time of commercial power outage.

(A) is a block diagram which shows schematic structure of the charging / discharging system which concerns on one Embodiment of this invention, (b) is a perspective view which shows schematic structure of the said charging / discharging system, (c) is It is a perspective view which shows the structure of a charging / discharging connector. It is a block diagram which shows the further detailed structure of the said charging / discharging system. It is a top view of the charging / discharging port of the said electric vehicle. It is explanatory drawing which shows schematic structure of the setting part of the charger / discharger which concerns on one Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the said setting part. It is explanatory drawing which shows schematic structure of the setting part of the charger / discharger which concerns on other embodiment of this invention. It is a flowchart for demonstrating operation | movement of the said setting part. It is explanatory drawing which shows schematic structure of the setting part of the charger / discharger which concerns on other embodiment of this invention. It is a block diagram which shows schematic structure of an auxiliary battery.

(Embodiment 1)
The following describes Embodiment 1 of the present invention with reference to FIGS.

  In the embodiment described below, as an example, a case where an electric vehicle charged / discharged by the charging / discharging device of the present invention is applied to an electric vehicle (EV) will be described. However, the electric vehicle charged / discharged by the charging / discharging device of the present invention is not limited to the above example, and is a hybrid vehicle (HEV) equipped with a large capacity secondary battery (having a power storage function), a plug-in hybrid. It may be a vehicle (PHEV) or a fuel cell vehicle (FCV) equipped with a secondary battery (having a power storage function).

(Outline of charge / discharge system)
FIG. 1A is a block diagram illustrating a schematic configuration of a charge / discharge system 1 according to the present embodiment. The charge / discharge system 1 includes an electric vehicle (electric vehicle) 2, a charger / discharger (charge / discharge device) 3, a power system (main power supply) 7, and a load device 8.

  The electric vehicle 2 includes a drive battery 21. The electric vehicle 2 travels by supplying the electric power stored in the drive battery 21 to an electric motor (not shown) and driving the electric motor. The electric vehicle 2 has a function of discharging the charger / discharger 3.

  For example, the charger / discharger 3 is installed in a parking space of an electric vehicle 2 in a general household, and has a function of charging the electric vehicle 2 and a function of accepting discharge from the electric vehicle 2. The charger / discharger 3 includes a main body 4, a charge / discharge cable 5, and a charge / discharge connector (connector) 6. More detailed configurations of the electric vehicle 2 and the charger / discharger 3 will be described later.

  The main body 4 is connected to a power system 7 and a load device 8 such as a home appliance via an AC bus 9.

  FIG. 1B is a perspective view illustrating a schematic configuration of the charge / discharge system 1. By connecting the charge / discharge connector 6 to the charge / discharge port 22 of the electric vehicle 2, the electric vehicle 2 and the main body 4 of the charger / discharger 3 are electrically connected.

  FIG. 1C is a perspective view showing the configuration of the charge / discharge connector 6. The charge / discharge connector 6 is provided with a lever 61. The charging / discharging port 22 is connected to the electric vehicle 2 by inserting the distal end portion 62 to a predetermined depth of the charging / discharging port 22 while grasping the lever 61.

(Configuration of electric vehicle)
FIG. 2 is a block diagram showing a more detailed configuration of the charge / discharge system 1. The electric vehicle 2 includes the above-described drive battery 21 and charge / discharge port 22, a contactor 23, an EV communication unit 24, and an EV control unit 25 including the EV communication unit 24.

  The driving battery 21 is a large-capacity storage battery that stores electric power to be supplied to an electric motor (not shown).

  The contactor 23 is an electromagnetic contactor that opens and closes a current path between the driving battery 21 and the charge / discharge port 22.

  The EV communication unit 24 is electrically connected to the charger / discharger communication unit 45 of the charger / discharger 3 when the charge / discharge connector 6 is connected to the charge / discharge port 22. Between the EV communication unit 24 and the charger / discharger communication unit 45, for example, information indicating the rated power of the charger / discharger 3, the voltage / remaining amount of the driving battery 21, and the like are transmitted and received.

  FIG. 3 is a plan view of the charge / discharge port 22. As shown in FIG. 3, the charge / discharge port 22 includes a high voltage power port P1 and a communication port P2. Further, as shown in FIG. 2, the high voltage power port P1 is electrically connected to the driving battery 21 via the contactor 23, and the communication port P2 is electrically connected to the EV communication unit 24. Yes.

(Configuration of charger / discharger)
The charger / discharger 3 has a function of charging the drive battery 21 of the electric vehicle 2 and a function of accepting discharge from the drive battery 21 of the electric vehicle 2. The main body 4 of the charger / discharger 3 includes a main circuit unit 41, a charger / discharger control unit (control unit) 42, a main power converter (main power source) 43, a discharge power converter 44, and a charger / discharger control. The charging / discharging device communication unit 45 included in the unit 42, a setting unit 46a, and an auxiliary battery (auxiliary power source) 47 are provided.

  The main circuit unit 41 controls at least one of the voltage and current in the current path by the switching operation of the switch element. When charging the electric vehicle 2, power from the power system 7 is supplied to the drive battery 21 via the main circuit unit 41. At this time, the main circuit unit 41 converts AC power from the power system 7 into DC power. On the other hand, when the electric vehicle 12 is used as an external power source, the discharged power from the driving battery 21 is supplied to the load device 8 via the main circuit unit 41. At this time, the main circuit unit 41 converts the DC power from the driving battery 21 into AC power.

  The charger / discharger control unit 42 controls charging of the electric vehicle 2 and acceptance of discharge power from the electric vehicle 2 by outputting a control signal for controlling the switching operation of the main circuit unit 41. Specifically, at the time of charging, the charger / discharger control unit 42 controls the main circuit unit 41 to convert the electric power from the AC bus 9 into a predetermined voltage and supply it to the electric vehicle 2. On the other hand, at the time of discharging, the charger / discharger control unit 42 controls the main circuit unit 41 to convert the high voltage power supplied from the electric vehicle 2 into a predetermined voltage and supply it to the AC bus 9.

  The main power converter 43 converts the power supplied from the AC bus 9 or the main circuit unit 41 into low-voltage control power (main power) and supplies it to the charger / discharger control unit 42. At this time, since the power supplied from the AC bus 9 or the main circuit unit 41 is AC power, it is converted into DC power by the main power converter 43.

  The discharge power converter 44 converts the power supplied from the electric vehicle 2 into low-voltage control power (discharge power) and supplies it to the charger / discharger controller 42. In the present embodiment, the discharge power converter 44 is not necessarily provided. When there is no discharge power converter 44, the DC power supplied from the electric vehicle 2 is converted into AC power by the main circuit unit 41, and converted into DC power again by the main power converter 43, and the charger / discharger control unit. 42 may be supplied.

  The charger / discharger communication unit 45 transmits / receives necessary information to / from the EV communication unit 24 of the electric vehicle 2 in a state where the charge / discharge connector 6 is connected to the charge / discharge port 22.

  The main body 4 is connected to a power system 7 and a load device 8 such as a home appliance via an AC bus 9. By connecting the charging / discharging connector 6 to the charging / discharging port 22 of the electric vehicle 2, the main circuit unit 41 and the driving battery 21 are electrically connected via the contactor 23. In addition, the charger / discharger communication unit 45 and the EV communication unit 24 are electrically connected, and, for example, the rated power of the charger / discharger 3 and the drive power are connected between the EV communication unit 24 and the charger / discharger communication unit 45. Information indicating the voltage and remaining amount of the battery 21 is transmitted and received.

  The charge / discharge connector 6 includes a high voltage power port P4 and a communication port P5. In a state where the charge / discharge connector 6 is connected to the charge / discharge port 22, the high voltage power port P4 and the communication port P5 are in contact with the high voltage power port P1 and the communication port P2 of the charge / discharge port 22, respectively.

  The high voltage power port P4 is electrically connected to the main circuit unit 41, and the communication port P5 is electrically connected to the charger / discharger communication unit 45.

  The setting unit 46a supplies power to the charger / discharger control unit 42 from one of the main power converter 43, the discharge power converter 44, and the auxiliary battery 47 that can supply power to the charger / discharger control unit 42. It is for setting the electric power feeding path | route for doing. The setting unit 46a is connected to each of the main power converter 43, the discharge power converter 44, the auxiliary battery 47, and the charger / discharger control unit 42. The setting unit 46a supplies power to the charger / discharger control unit 42 using one of the main power converter 43, the discharge power converter 44, and the auxiliary battery 47, as will be described later.

  FIG. 4 is a schematic configuration diagram of the setting unit 46a. As shown in FIG. 4, the setting unit 46 a includes a first power supply line 51 a that connects between the charger / discharger control unit 42 and the auxiliary battery 47, a second power supply line 52 a that connects to the main power converter 43, A third power supply line 53 a connected to the discharge power converter 44 and a switch (connection part) 54 are provided.

  The first power supply line 51 a is connected to the second power supply line 52 a or the third power supply line 53 a by the operation of the switch 54. When the first power supply line 51a and the second power supply line 52a are connected, the control power supplied from the main power converter 43 is controlled by the charger / discharger via the second power supply line 52a and the first power supply line 51a. Power is supplied to the unit 42. In this case, the setting unit 46a has set a power supply path for supplying the control power of the main power converter 43 to the charger / discharger control unit 42 using the first power supply line 51a and the second power supply line 52a. become.

  On the other hand, when the first feed line 51a and the third feed line 53a are connected, the control power fed from the discharge power converter 44 is charged / discharged via the third feed line 53a and the first feed line 51a. Power is supplied to the electric appliance control unit 42. In this case, in this case, the setting unit 46a uses the first power supply line 51a and the second power supply line 52a to provide a power supply path for supplying the control power of the main power converter 43 to the charger / discharger control unit 42. It will be set.

  Here, one of the main power converter 43 and the discharge power converter 44 described above is connected to the first power supply line 51a by the operation of the switch 54, and the auxiliary battery 47 is always connected. Unlike the battery 21 for driving the electric vehicle 2, the auxiliary battery 47 is a small-capacity storage battery. In particular, the auxiliary battery 47 having a voltage value lower than the voltage value of each control power of the main power converter 43 and the discharge power converter 44 is prepared. For example, the voltage value of the power of the auxiliary battery 47 is 12V, and the voltage value of each control power of the main power converter 43 and the discharge power converter 44 is 13V.

  Since the voltage value of the power of the auxiliary battery 47 is lower than the voltage values of the control power of the main power converter 43 and the discharge power converter 44, for example, the switch 54 causes the first feed line 51a and the second feed line 52a to Is connected, the control power of the main power converter 43 is fed to the charger / discharger controller 42. Similarly, when the first power supply line 51 a and the third power supply line 53 a are connected by the switch 54, the control power of the discharge power converter 44 is supplied to the charger / discharger control unit 42. .

In other words, the power discharged from the auxiliary battery 47 is supplied to the charger / discharger controller 42 via the first power supply line 51a in any of the following cases.
(1) When the first power supply line 51a and the second power supply line 52a are connected, when the control power is not supplied from the main power converter 43 (2) the first power supply line 51a and the third power supply line When the control power is not supplied from the discharge power converter 44 when the switch 53 is connected, the switching operation of the switch 54 is controlled by the charger / discharger controller 42. If the charger / discharger controller 42 feeds the control power from the main power converter 43 to itself, the charger / discharger controller 42 connects the second feeder 52a to the first feeder 51a using the switch 54. . On the other hand, if the control power from the discharge power converter 44 is supplied to itself, the switch 54 is used to connect the third power supply line 53a to the first power supply line 51a.

  Here, FIG. 9 shows a schematic configuration of the auxiliary battery 47. As shown in FIG. 9, the auxiliary battery 47 includes a battery main body 71, a diode 72, and a switch 73. In the auxiliary battery 47, the main power converter 43 or the discharge power converter 44 (here, both are simply referred to as “converter”) between the battery main body 71 and the charger / discharger controller 42. ) To the battery main body 71 to prevent backflow. The diode 72 prevents the battery body 71 from being overcharged by preventing such backflow.

  Without the diode 72, when there is a voltage difference between the output voltage of the battery main body 71 and the converter, a charging current flows from the converter side to the battery main body 71 side, and the battery main body 71 becomes the voltage of the converter. The battery main body 71 and the converter become the same voltage. In this case, the small capacity auxiliary battery 47 is overcharged.

  From the viewpoint of preventing the above-described backflow, the same effect can be obtained even if a resistor is used instead of the diode 72.

  Further, as will be described later, for example, the auxiliary battery 47 can be charged using the control power of the main power converter 43. In this case, the setting unit 46a and the battery main body 71 may be short-circuited using the switch 73. The switch 73 may be switched by, for example, the charger / discharger controller 42.

  Next, the operation of the setting unit 46a will be described using FIG. 4 and FIG. FIG. 5 is a flowchart for explaining the operation of the setting unit 46a of FIG.

  As shown in FIG. 5, first, the charger / discharger control unit 42 connects the first power supply line 51a and the second power supply line 52a using the switch 54 (step S101). In step S101, if power is supplied from the power grid 7, the control power is supplied from the main power converter 43 to the second power supply line 52a, and the control power is supplied to the second power supply line 52a and the first power supply line. Power is supplied to the charger / discharger controller 42 via 51a. Although the auxiliary battery 47 is connected to the first power supply line 51a, since the voltage value of the power of the auxiliary battery 47 is lower than the voltage value of the control power of the main power converter 43, the control power of the main power converter 43 is Power is supplied to the charger / discharger controller 42 via the first power supply line 51a. At this time, the auxiliary battery 47 may be charged using the control power of the main power converter 43.

  Next, when the power system 7 fails in an emergency such as an earthquake disaster, the supply of control power from the main power converter 43 is stopped (step S102). In this step S102, when the supply of control power from the main power converter 43 is stopped, it is necessary to supply power instead.

  Next, when the supply of control power from the main power converter 43 is stopped, the supply of power from the auxiliary battery 47 connected to the first power supply line 51a is started (step S103). In step S <b> 103, power supply from the auxiliary battery 47 starts from the timing of stopping the control power from the main power converter 43. This is because the feeding of control power from the main power converter 43, which has stopped feeding from the auxiliary battery 47, has stopped.

  Even if the supply of control power from the main power converter 43 is stopped by this step S103, the supply of power from the auxiliary battery 47 is continued from the stop timing. The charger / discharger control unit 42 continues to supply power even after stopping the supply of control power from the main power converter 43, that is, after a power failure of the power system 7, due to such a power supply linkage. It will be.

  Next, the charger / discharger control unit 42 detects a change in the voltage value of the power supplied via the first power supply line 51a (step S104). In this step S104, for example, if the voltage value of the control power of the main power converter 43 is 13V and the voltage value of the power of the auxiliary battery 47 is 12V, the charger / discharger control unit 42 is the difference between them. Changes in the voltage value of “1V” are detected. The charger / discharger control unit 42 recognizes the stop of the supply of the control voltage from the main power converter 43, that is, the power failure of the power system 7 by detecting the change in the voltage value. For example, in order to perform such detection, the charger / discharger controller 42 recognizes in advance the voltage value of the control power supplied from the main power converter 43 and the voltage value of the auxiliary power supplied from the auxiliary battery 47. You may do it.

  Next, when the charger / discharger control unit 42 detects a change in the voltage value of the power supplied via the first power supply line 51a, the charger / discharger control unit 42 uses the switch 54 to replace the second power supply line 52a with the third power supply. The electric wire 53a is connected to the first power supply line 51a (step S105). In step S105, the charger / discharger control unit 42 changes the main power converter 43 to connect the first power supply line 51a to the main power so as to receive the control power from the discharge power converter 44. The second feed line 52a to which the converter 43 is connected is switched to the third feed line 53a.

  Here, if the electric vehicle 2 is not connected to the charger / discharger 3, the control power from the discharge power converter 44 is not supplied. As described above, power supply from the auxiliary battery 47 is continued after the supply of control power from the main power converter 43 is stopped. The operation of the charger / discharger control unit 42 is continued by the power supply. In this step S105, even after the power failure of the power system 7, the charger / discharger control unit 42 outputs a control signal for controlling the switching operation of the main circuit unit 41 and discharges from the electric vehicle 2. It becomes possible to control the acceptance of power.

Then, when acceptance of discharge power from the electric vehicle 2 is started under the control of the charger / discharger control unit 42, feeding of control power from the discharge power converter 44 is started (step S106). In step S106, the third power feed line 53a is connected to the first power feed line 51a using the switch 54. When the control power from the discharge power converter 44 is supplied via the third power supply line 53a, the power supply from the auxiliary battery 47 connected to the first power supply line 51a is stopped. This is because the supply of control power from the discharge power converter 44 to the first power supply line 51a has started. For example, if the voltage value of the control power from the discharge power converter 44 is 13V and the voltage value of the power from the auxiliary battery 47 is 12V, the control power from the discharge power converter 44 having a high voltage value is the first supply. Power is supplied to the charger / discharger controller 42 via the electric wire 51a.
At this time, the auxiliary battery 47 may be charged using the control power from the discharge power converter 44.

  As described above, the auxiliary battery 47 is charged / discharged through the first power supply line 51 a from the stop of the supply of the control power from the main power converter 43 to the start of the supply of the control power from the discharge power converter 44. Electric power is supplied to the electric appliance control unit 42. That is, the auxiliary battery 47 has the charger / discharger control unit 42 of the electric vehicle 2 at least between the timing of stopping power supply from the main power converter 43 and the timing of starting power supply from the discharge power converter 44. It suffices if the power capacity is such that the discharge can be controlled. As a result, the capacity of the auxiliary battery 47 can be reduced, and the manufacturing cost of the charger / discharger 3 can be reduced.

  As described above, according to the charger / discharger 3, even when the supply of control power from the main power converter 43 is stopped, the power supply from the auxiliary battery 47 can be continued. For this reason, the supply of the control power from the discharge power converter 44 can be started without stopping the operation of the charger / discharger controller 42.

  Further, the auxiliary battery 47 only needs to be able to supply power to the charger / discharger controller 42 from the timing of stopping the power supply of the main power converter 43 to the timing of starting the power supply from the discharge power converter 44. That is, the power supply time by the auxiliary battery 47 does not increase unnecessarily. For this reason, since the capacity | capacitance of the auxiliary | assistant battery 47 can be reduced in volume, the increase in the manufacturing cost of the charger / discharger control part 42 is not caused.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 6 is a schematic configuration diagram of the setting unit 46b according to the second embodiment of the present invention. The second embodiment of the present invention is different from the first embodiment in that the switch 54 of the setting unit 46a of the first embodiment is replaced with the first diode (first rectifier element) 55 and the second diode (first diode). 2 rectifier elements) 56. Configurations other than those described in the present embodiment are the same as those in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiment 1 are given the same reference numerals, and explanation thereof is omitted.

  As shown in FIG. 6, the setting unit 46 b includes a first power supply line 51 b that connects between the charger / discharger control unit 42 and the auxiliary battery 47, a second power supply line 52 b that connects to the main power converter 43, A third feed line 53b connected to the discharge power converter 44, a first diode 55 arranged in the middle of the second feed line 52b, and a second diode 56 arranged in the middle of the third feed line 53b. Have.

  The first power supply line 51b connects between the charger / discharger controller 42 and the auxiliary battery 47, and is connected to each of the second power supply line 52b and the third power supply line 53b.

  A first diode 55 is disposed in the middle of the second power supply line 52b. The first diode 55 is a semiconductor element having a function of flowing a current in a direction from the main power converter 43 side toward the first power supply line 51b and not flowing a current in the opposite direction. In other words, the second power supply line 52b is an element having a rectifying action for flowing a current in a certain direction. By this rectifying action, for example, the flow of current toward the main power converter 43 can be interrupted, so that current does not flow from the discharge power converter 44 or the auxiliary battery 47 to the main power converter 43. can do.

  Similarly, a second diode 56 is disposed in the middle of the third power feed line 53b. Since the operation of second diode 56 is the same as that of first diode 55 described above, description thereof will not be repeated.

  In the setting unit 46b, unlike the setting unit 46a of the first embodiment, the first power supply line 51b, the second power supply line 52b, and the third power supply line 53b are connected to each other. Therefore, when there is power feeding from the main power converter 43 via the second feeding line 52b and power feeding from the discharge power converter 44 via the third feeding line 53b, the power from the main power converter 43 Power must be supplied to the charger / discharger controller 42.

  Therefore, in the setting unit 46b, the voltage value of the control voltage from the main power converter 43, the voltage value of the control power from the discharge power converter 44, and the voltage value of the power from the auxiliary battery 47 become lower in this order. ing. For this reason, even when the control power from either the main power converter 43 or the discharge power converter 44 is supplied, the power supply from the auxiliary battery 47 is stopped. Further, when the control power from the main power converter 43 is supplied, the supply of control power from the discharge power converter 44 is stopped.

  In addition, when supply of control power from the discharge power converter 44 is stopped, it is not necessary to operate the discharge power converter 44. For this reason, the charger / discharger control unit 42, when receiving control power from the main power converter 43, stops the power conversion of the discharge power converter 44 to thereby reduce the power consumption of the discharge power converter 44. Can be reduced.

  Next, the operation of the setting unit 46b will be described using FIG. 6 and FIG. FIG. 7 is a flowchart for explaining the operation of the setting unit 46b of FIG.

  First, in the setting unit 46b of FIG. 6, the first power supply line 51b, the second power supply line 52b, and the third power supply line 53b are connected to each other. For this reason, if power is supplied from the power system 7, the control power is supplied from the main power converter 43 to the second power supply line 52b, and the control power is supplied to the second power supply line 52b and the first power supply line 51b. Power is supplied to the charger / discharger controller 42. An auxiliary battery 47 is connected to the first power supply line 51b and a discharge power converter 44 is connected to the third power supply line 53b. The voltage value of the power of the auxiliary battery 47 and the control power of the discharge power converter 44 are Is lower than the voltage value of the control power of the main power converter 43, the control power of the main power converter 43 is fed to the charger / discharger controller 42 via the first power supply line 51b. Become. At this time, the auxiliary battery 47 may be charged using the control power of the main power converter 43. In addition, the control power of the main power converter 43 is not supplied to the discharge power converter 44 via the second power supply line 52b and the third power supply line 53b. This is because the current can be prevented from flowing into the discharge power converter 44 by the rectifying action of the second diode 56 disposed in the middle of the third feeder 53b.

  Then, when the power system 7 loses power in an emergency such as an earthquake disaster, the supply of control power from the main power converter 43 is stopped (step S201). Also in step S201, when the supply of control power from the main power converter 43 is stopped, as in step S102 of FIG. 5 described above, it is necessary to supply power instead.

  Next, when the supply of control power from the main power converter 43 is stopped, the supply of power from the auxiliary battery 47 connected to the first power supply line 51b is started (step S202). In step S202, power supply from the auxiliary battery 47 starts from the timing of stopping the control power from the main power converter 43. This is because the feeding of control power from the main power converter 43, which has stopped feeding from the auxiliary battery 47, has stopped.

  Even if the supply of control power from the main power converter 43 is stopped by this step S202, the supply of power from the auxiliary battery 47 is continued from the stop timing as a starting point. The charger / discharger control unit 42 continues to supply power even after stopping the supply of control power from the main power converter 43, that is, after a power failure of the power system 7, due to such a power supply linkage. It will be.

  Further, the power of the auxiliary battery 47 is not supplied to the main power converter 43 via the first power supply line 51b and the second power supply line 52b. Similarly, the power of the auxiliary battery 47 is not supplied to the discharge power converter 44 via the first power supply line 51b and the third power supply line 53b. This is because the main power converter 43 and the discharge power converter 44 are caused by the rectifying action of the first diode 55 disposed in the middle of the second feeder line 52b and the second diode 56 disposed in the middle of the third feeder line 53b. This is because current can be prevented from flowing into the.

  Next, the charger / discharger control unit 42 detects a change in the voltage value of the power supplied via the first power supply line 51b (step S203). In this step S203, for example, if the voltage value of the control power of the main power converter 43 is 13V and the voltage value of the power of the auxiliary battery 47 is 12V, the charger / discharger control unit 42 is the difference between them. Changes in the voltage value of “1V” are detected. The charger / discharger control unit 42 recognizes the stop of the supply of the control voltage from the main power converter 43, that is, the power failure of the power system 7 by detecting the change in the voltage value. For example, in order to perform such detection, the charger / discharger controller 42 recognizes in advance the voltage value of the control power supplied from the main power converter 43 and the voltage value of the auxiliary power supplied from the auxiliary battery 47. You may do it.

  Here, if the electric vehicle 2 is not connected to the charger / discharger 3, the control power from the discharge power converter 44 is not supplied. As described above, power supply from the auxiliary battery 47 is continued after the supply of control power from the main power converter 43 is stopped. The operation of the charger / discharger control unit 42 is continued by the power supply.

  After the power failure of the power system 7, the charger / discharger control unit 42 outputs a control signal for controlling the switching operation of the main circuit unit 41, and controls the acceptance of the discharge power from the electric vehicle 2 (step S204). .

  In step S <b> 204, the charger / discharger controller 42 may start power conversion of the discharge power converter 44 in preparation for receiving discharge power from the electric vehicle 2. In other words, the charger / discharger control unit 42 may operate the discharge power converter 44 only when receiving the discharge power from the electric vehicle 2. Thereby, the power consumption of the discharge power converter 44 can be reduced.

  Then, when reception of discharge power from the electric vehicle 2 is started under the control of the charger / discharger control unit 42, feeding of control power from the discharge power converter 44 is started (step S205). In step S205, when the control power from the discharge power converter 44 is supplied through the third power supply line 53b, the power supply from the auxiliary battery 47 connected to the first power supply line 51b is stopped. This is because the supply of control power from the discharge power converter 44 to the first power supply line 51b has started. For example, if the voltage value of the control power from the discharge power converter 44 is 13V and the voltage value of the power from the auxiliary battery 47 is 12V, the control power from the discharge power converter 44 having a high voltage value is the first supply. Electric power is supplied to the charger / discharger controller 42 through the electric wire 51b. At this time, the auxiliary battery 47 may be charged using the control power from the discharge power converter 44.

  As described above, according to the charger / discharger 3, even when the supply of control power from the main power converter 43 is stopped, the power supply from the auxiliary battery 47 can be continued. For this reason, the supply of the control power from the discharge power converter 44 can be started without stopping the operation of the charger / discharger controller 42.

  Further, the auxiliary battery 47 only needs to be able to supply power to the charger / discharger controller 42 from the timing of stopping the power supply of the main power converter 43 to the timing of starting the power supply from the discharge power converter 44. That is, the power supply time by the auxiliary battery 47 does not increase unnecessarily. For this reason, since the capacity | capacitance of the auxiliary | assistant battery 47 can be reduced in volume, the increase in the manufacturing cost of the charger / discharger control part 42 is not caused.

(Other embodiments)
In the first and second embodiments, the charger / discharger control unit 42 detects the change in the voltage value of the power supplied via the first power supply line 51a, thereby controlling the control power from the main power converter 43. , That is, a power failure of the power system 7 was detected. For example, instead of such a detection method, as shown in FIG. 8, the charger / discharger control unit 42 may further include a monitoring unit 48 that monitors a power failure of the power system 7.

  The monitoring unit 48 is connected to the power system 7 and monitors the presence / absence of power supply from the power system 7, and the charger / discharger control unit 42 uses this monitoring unit 48 to determine whether there is a power failure in the power system 7. Can be detected. In this case, unlike the first and second embodiments, a process for detecting a change in voltage value is not required, and the load on the charger / discharger control unit 42 can be reduced accordingly.

  Moreover, in said Embodiment 1 and 2, although demonstrated using the case where the power failure of the electric power grid | system 7 generate | occur | produced at the time of the charging / discharging stop of the electric vehicle 2, this invention is the time of charging / discharging of the electric vehicle 2. The same effect can be obtained also in.

  For example, if the electric vehicle 2 is charged when a power failure occurs in the power system 7, the power supplied from the AC bus 9 to the main body 4 is stopped. In this case, the operations of setting units 46a and 46b are performed in the same manner as when charging / discharging is stopped.

  On the other hand, if the electric vehicle 2 is discharged when a power failure occurs in the power system 7, (i) whether the power supplied from the AC bus 9 to the main body 4 has stopped, (ii) the main It is preferable that the main circuit unit 41 can distinguish whether the power obtained by converting the DC power from the driving battery 21 into the AC power is stopped by the circuit unit 41.

  For example, when power is supplied from the power system 7, the main circuit unit 41 performs a process of converting DC power from the driving battery 21 into AC power, and the AC waveform of the AC power from the power system 7. Control based on And at the time of the power failure of the electric power grid | system 7, the main circuit part 41 stops the above-mentioned conversion process from the change of an alternating current waveform. The main circuit unit 41 stops the control of the above-described conversion process based on the AC waveform of the AC power from the power system 7, and is independent and continues the above-described conversion process. In this case, the operations of setting units 46a and 46b are performed in the same manner as when charging / discharging is stopped.

  When the main circuit unit 41 cannot distinguish between the above (i) and (ii), the discharge of the driving battery 21 of the electric vehicle 2 is continued in the case of the above (i). . On the other hand, in the case of (ii) described above, power supply from the AC bus 9 to the main body 4 is continued.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention is suitable for a charging / discharging device that charges and discharges an electric vehicle having a power storage function.

DESCRIPTION OF SYMBOLS 1 Charging / discharging system 2 Electric vehicle 3 Charger / discharger (charge / discharge device)
4 Body 5 Charging / Discharging Cable 6 Charging / Discharging Connector 7 Power System (Main Power)
8 Load device 9 AC bus 21 Battery for driving 22 Charge / discharge port 23 Contactor 24 EV communication unit 25 EV control unit 41 Main circuit unit 42 Charge / discharge device control unit (control unit)
43 Main power converter 44 Discharge power converter 45 Charger / discharger communication unit 46a, 46b Setting unit 47 Auxiliary battery (auxiliary power source)
48 monitoring unit 51a, 51b first feed line 52a, 52b second feed line 53a, 53b third feed line 54 switch 55 first diode (first rectifying element)
56 Second diode (second rectifier)

Claims (13)

A charging / discharging device for charging / discharging an electric vehicle having a power storage function,
A controller that controls the discharge of the electric vehicle using the supplied electric power;
An auxiliary power source that starts supplying auxiliary power to the control unit when the main power supply from the main power source to the control unit is stopped. Discharge device.   The auxiliary power supply further stops the supply of auxiliary power to the control unit from the timing of the start of discharge power supply when the supply of discharge power from the electric vehicle to the control unit is started. The charge / discharge device according to claim 1.   The auxiliary power supply is capable of controlling the discharge of the electric vehicle by using the auxiliary power at least from the timing of stopping the main power feeding to the timing of starting the discharging power feeding. It has electric power capacity, The charging / discharging apparatus of Claim 2 characterized by the above-mentioned.   The charging / discharging according to claim 2, further comprising a setting unit that sets a power supply path for supplying power to the control unit from one of the main power source, the auxiliary power source, and the electric vehicle. apparatus. The setting unit has a first power supply line that connects between the auxiliary power source and the control unit,
When the main power supply supplies the main power to the first power supply line, the power supply path supplies the main power to the control unit instead of the auxiliary power from the auxiliary power supply, When the electric vehicle supplies the discharge power to the first power supply line, the setting unit sets the discharge power to supply the control unit instead of the auxiliary power from the auxiliary power source. The charging / discharging device according to claim 4. The setting unit
A second feeder connected to the main power source;
A third feeder connected to the electric vehicle;
A connection part for connecting the second feed line or the third feed line to the first feed line;
The voltage value of the auxiliary power is lower than the voltage values of the main power and the discharge power,
The charging / discharging device according to claim 5, wherein the connection unit connects the third power supply line to the first power supply line with the timing of stopping the main power supply as a starting point.   The charging / discharging according to claim 6, wherein when the main power feeding stop is detected, the control unit connects the third feeding line to the first feeding line using the connection unit. apparatus.   The charging / discharging device according to claim 7, wherein the control unit detects a change in voltage value from the voltage value of the main power to the voltage value of the auxiliary power as the main power supply stop.   The charging / discharging device according to claim 7, wherein the control unit further includes a monitoring unit that monitors whether the main power is output from the main power source. A main power converter connected between the main power source and the second feeder, and converting the main power;
10. The apparatus according to claim 6, further comprising a discharge power converter that is connected between the electric vehicle and the third power supply line and that converts the discharge power into a power. Charging / discharging device. The setting unit
A second feeder connected to the main power source;
A third feeder connected to the electric vehicle;
A first rectifier element connected between the first power supply line and the second power supply line and configured to flow a current in a direction from the second power supply line toward the first power supply line;
A second rectifying element that is connected between the first power supply line and the third power supply line and flows a current from the third power supply line toward the first power supply line;
The charging / discharging device according to claim 5, wherein the voltage value of the main power, the voltage value of the discharge power, and the voltage value of the auxiliary power become lower in this order. A discharge power converter that is connected between the electric vehicle and the third feeder and that converts the discharge power into power;
The charge / discharge device according to claim 11, wherein the discharge power converter is controlled by the control unit to determine whether or not it performs power conversion.   The charging / discharging device according to claim 11 or 12, further comprising a main power converter connected between the main power source and the second power supply line and converting the main power.

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