JP2011223808A - Power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a storage battery for domestic use charged with commercial power supplied from a power company as a power source for charging a vehicle such as an electric vehicle.SOLUTION: An in-vehicle storage battery 12 is charged with the power of a storage battery 8 for domestic use and system power from a bidirectional charger 7 by stopping charging from a power system of the storage battery 8 and the power supply from the storage battery 8 to an electric load 5 for domestic use when a vehicle 11 such as an electric vehicle is connected to a vehicle charger 26. According to such a scheme, the storage battery 8 for domestic use can be effectively utilized.

Description

  The present invention relates to a power supply apparatus capable of charging an electrically powered vehicle using a combination of power from a storage battery charged with commercial power supplied from an electric power company and commercial power.

  Electric powered vehicles such as an electric vehicle that obtains driving force by an electric motor and a hybrid vehicle that has an engine and an electric motor as power sources are becoming popular. For example, an electric vehicle can be charged in a short time using a high-speed charger to which direct-current power is supplied. On the other hand, a technique for charging an electric vehicle using commercial power of a house is known (see, for example, Patent Document 1). In the conventional technique, AC commercial power supplied to a house is converted to DC, and the electric vehicle is charged using the converted DC power.

  By the way, in a house such as a house, it is practical to store commercial power supplied from an electric power company in a household storage battery, for example, to supply power from the storage battery to an electric load as a backup power source at the time of commercial power outage It has become. By providing a storage battery for home use, charging the storage battery with low-cost late-night power and supplying the power of the storage battery as a power source for an electric load in the daytime is performed. In addition, household power generation facilities such as solar power generation and fuel cells have been put into practical use, and electric power from home power generation facilities is charged in storage batteries.

  Various techniques for charging an electric vehicle using commercial power in a house have been proposed. However, in the current situation where power supply devices equipped with household storage batteries are widespread, it has been desired that electric vehicles can be charged effectively using the storage batteries. For example, it is desired that even an existing power supply facility equipped with a household storage battery can charge an electric vehicle by effectively using the power of the storage battery.

JP 2008-199780 A

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a power supply apparatus that can effectively use a domestic storage battery for charging an electrically powered vehicle.

  In order to achieve the above object, a power supply apparatus according to a first aspect of the present invention includes a storage battery charged by system power from a power supply source, and an electric load of a house by converting the power stored in the storage battery into alternating current. A two-way charger for supplying to an electrically powered vehicle, a vehicle charger for supplying electric power stored in the storage battery to the electrically powered vehicle via a path different from the two-way charger, and the storage battery When the vehicle is connected to the vehicle, based on the on-board storage battery mounted on the vehicle and the state of charge of the storage battery, the amount of electric power of the storage battery supplied to the vehicle from the bidirectional charger and the vehicle charger And a control means for controlling the distribution of.

  In the present invention according to claim 1, when the vehicle is connected to the vehicle charger, the storage battery is charged by the system power from the power supply source by the bidirectional charger, and the power is supplied from the storage battery to the electrical load of the house. The vehicle battery charger supplies the electric power of the storage battery to the vehicle, and the vehicle is charged by the electric power of the storage battery. For this reason, it becomes possible to effectively use a storage battery for home use for charging an electrically powered vehicle.

  And the power supply device of this invention which concerns on Claim 2 is the power supply device of Claim 1, The supply system which connects the said system | strain electric power to the electric load of the said house, The electric power from the said bidirectional | two-way charger, and the said And selecting means for selecting system power from a supply system and supplying the selected system power to the electric load.

  In the present invention according to claim 2, the power is supplied to the electric load by selecting the grid power and the power from the storage battery by the selection means, and the vehicle is charged by the power of the storage battery.

  According to a third aspect of the present invention, there is provided the power supply device according to the second aspect, wherein the grid power is midnight power from an electric power company or electric power obtained from power generation means for houses. And

  In this invention which concerns on Claim 4, the electric power of the storage battery in which the late-night electric power from an electric power company and the electric power obtained from the power generation means for houses was stored can be used for charge with respect to a vehicle.

  The power supply device of the present invention can effectively use a household storage battery for charging an electrically powered vehicle.

1 is an overall configuration diagram of a power supply device according to an embodiment of the present invention. It is a block block diagram of the principal part in FIG. It is a flowchart of charge control. This is a change in the charging status with time.

  FIG. 1 is a schematic diagram for explaining an overall system of a power supply device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an outline of a specific configuration of a storage battery body, and FIG. FIG. 4 shows an operation flow of the charging process, and FIG. 4 shows a change with time of the charging current when charging the vehicle.

  The overall configuration of the power supply device will be described with reference to FIG.

  In the house 1, commercial power (system power) from an electric power company is supplied to the power receiving unit 3 through the electric wire 2, and the electric power supplied to the power receiving unit 3 is supplied to the electric load (home appliance or lighting) through the power distribution unit 4. Device 5). The house 1 includes a storage battery main body 6, and the storage battery main body 6 includes a bidirectional charger 7 and a storage battery (battery module) 8.

  System power (alternating current) is supplied from the power distribution unit 4 to the bidirectional charger 7, converted into direct current by the bidirectional charger 7, and supplied to the storage battery 8. The electric power stored in the storage battery 8 is sent to the bidirectional charger 7, converted into alternating current by the bidirectional charger 7, sent to the power distribution unit 4, and supplied to the electric load 5.

  On the other hand, an electric power vehicle 11 can be connected to the storage battery main body 6, and electric power stored in the storage battery 8 and system power via the bidirectional charger 7 can be charged to the vehicle 11. The vehicle 11 is an electric vehicle that obtains driving force by an electric motor. The electric power stored in the storage battery 8 during parking and the system power through the bidirectional charger 7 are supplied to the in-vehicle storage battery (in-vehicle battery) 12 to be mounted on the vehicle. The storage battery 12 is charged. As the vehicle, it is also possible to use a hybrid vehicle having an engine and an electric motor as power sources.

  The grid power sent from the power distribution unit 4 to the storage battery main body 6 is inexpensive, for example, late-night power is supplied and the storage battery 8 is charged. Further, the house 1 is provided with a solar power generation device 13 as a power generation means for the house, and the electric power obtained by the solar power generation device 13 is supplied to the storage battery body 6 to charge the storage battery 8. For this reason, the electric power of the daytime electric load 5 is supplied from the storage battery 8 in a state where the low-price late-night power or the power obtained by the solar power generation device 13 is charged, and the cost is substantially lower than the charge of the late-night power. Can cover daytime power.

  As the power generation means for houses, facilities for generating power using natural energy other than sunlight, and power generation facilities such as household fuel cells and household micro turbines are applied.

  Based on FIG. 2, the specific structure of the storage battery main body 6, the power receiving part 3, and the electricity distribution part 4 is demonstrated.

  System power is supplied from the power meter 21 to the power receiving unit 3 via the electric wire 2. The power receiving unit 3 is provided with a switching unit 22 as a selection unit, and the switching unit 22 switches the system power to be supplied to the breaker 23 on the storage battery body 6 side or the breaker 24 on the house 1 (see FIG. 1) side. . Further, the switching means 22 switches so that the electric power from the storage battery body 6 is supplied from the breaker 23 to the breaker 24 side.

  The storage battery body 6 is provided with a bidirectional charger 7, and system power is sent from the breaker 23 to the bidirectional charger 7. The bidirectional charger 7 is provided with a converter function, and the system power sent to the bidirectional charger 7 is converted from alternating current to direct current and supplied to the storage battery 8 to be stored. Further, the DC power stored in the storage battery 8 is converted into AC by the bidirectional charger 7, sent to the breaker 23 side, and supplied from the breaker 24 to the electric load 5. Supply of electric power in the bidirectional charger 7 is controlled by a command from the battery ECU 25.

  The storage battery body 6 is provided with a vehicle charger 26, and the vehicle charger 26 supplies the electric power stored in the storage battery 8 to the vehicle 11. In the vehicle charger 26, the voltage and current are controlled so that the electric power stored in the storage battery 8 is charged in the in-vehicle storage battery 12 in a short time. Further, the vehicle charger 26 supplies the system power converted into direct current by the bidirectional charger 7 to the vehicle 11 together with the power stored in the storage battery 8 or alone. In the vehicle charger 26, the voltage and current are controlled so that the in-vehicle storage battery 12 is charged with the grid power converted into direct current in a short time.

  Supply of electric power from the vehicle charger 26 to the vehicle 11 is controlled by a command of the battery ECU 25, and when the vehicle 11 is connected to the storage battery body 6, the battery ECU 25 communicates with the in-vehicle ECU 27 of the vehicle 11 to communicate with the in-vehicle storage battery 12. To understand the situation. The battery ECU 25 controls the vehicle charger 26 so as to supply the vehicle 11 with the power stored in the storage battery 8 and the system power converted into direct current with the bidirectional charger 7 based on the situation of the in-vehicle storage battery 12.

  When the vehicle 11 is connected to the vehicle charger 26 in order to charge the in-vehicle storage battery 12 of the vehicle 11, the bidirectional battery 7 charges the storage battery 8 with system power and supplies power from the storage battery 8 to the electrical load 5. Is stopped, the vehicle charger 26 supplies the power of the storage battery 8 and the system power from the bidirectional charger 7 to the vehicle 11, and the vehicle 11 is charged by the power of the storage battery 8 and the system power. For this reason, it becomes possible to use the storage battery 8 for homes effectively for the charge of the vehicle-mounted storage battery 12 of the electric power vehicle 11.

  Based on FIG. 3, FIG. 4, the operation | movement (control operation | movement by battery ECU25) of the charge process with respect to the vehicle-mounted storage battery 12 of the vehicle 11 is demonstrated concretely.

  As shown in FIG. 3, when the vehicle 11 is connected to the storage battery main body 6 and quick charging is requested, whether or not the charged amount (capacity) of the storage battery 8 exceeds the required charge amount of the in-vehicle storage battery 12 in step S <b> 1. Is judged. Information on the required charge amount of the storage battery body 6 is acquired by communication between the battery ECU 25 and the vehicle-mounted ECU 27.

  If it is determined in step S1 that the storage amount of the storage battery 8 exceeds the required charge amount of the in-vehicle storage battery 12, the in-vehicle storage battery 12 can be charged by the electric power stored in the storage battery 8, and therefore in both directions in step S2. The charger 7 is stopped, and rapid charging of the in-vehicle storage battery 12 by the storage battery 8 is started in step S3.

  That is, charging of the storage battery 8 with system power via the bidirectional charger 7 and supply of power from the storage battery 8 to the electric load 5 via the bidirectional charger 7 are stopped, and the power of the storage battery 8 is charged to the vehicle. It supplies to the vehicle 11 (refer FIG. 2) from the container 26 (refer FIG. 2), and charge of the vehicle-mounted storage battery 12 is started.

  If it is determined in step S1 that the storage amount of the storage battery 8 does not exceed the required charge amount of the in-vehicle storage battery 12, that is, the storage amount of the storage battery 8 is equal to or less than the required charge amount of the in-vehicle storage battery 12, the storage battery 8 is charged. Since the electric power is insufficient for charging the in-vehicle storage battery 12, the bidirectional charger 7 is operated to the charging side in step S4, and the in-vehicle storage battery 12 is rapidly charged by the bidirectional charger 7 and the storage battery 8 in step S5. To do.

  That is, the system power converted into direct current by the bidirectional charger 7 and the power stored in the storage battery 8 are combined and supplied from the vehicle charger 26 (see FIG. 2) to the vehicle 11 (see FIG. 2). 12 charging starts.

  When charging the in-vehicle storage battery 12 by combining the system power converted into direct current by the bidirectional charger 7 and the power stored in the storage battery 8, as shown in FIG. A value obtained by subtracting the system power current (maximum current from the bidirectional charger 7) converted into direct current by the charger 7 is used as the current from the storage battery 8. As a result, a large amount of time for the maximum current can be secured, and the charging time can be minimized.

  If the time is sufficient, the current from the storage battery 8 is used as the maximum allowable charge current, and after the storage battery 8 is completely discharged, the system power converted into direct current by the bidirectional charger 7 is charged. It is also possible to charge the vehicle charger 26 (see FIG. 2).

  Returning to the flowchart of FIG. 3, after the charging is performed, the charging is completed in step S <b> 6, and in step S <b> 7, the bidirectional charger 7 is returned to the state before the quick charging request and the processing is ended. That is, after the charging of the vehicle charger 26 (see FIG. 2) is completed, the storage battery 8 is charged with the grid power via the bidirectional charger 7 and the electric load is supplied from the storage battery 8 via the bidirectional charger 7. The supply of power to 5 is resumed.

  When the vehicle 11 is connected to the vehicle charger 26, the power supply device described above stops charging the storage battery 8 and supplying power from the storage battery 8 to the electric load 5. The in-vehicle storage battery 12 is charged with the grid power. For this reason, the storage battery 8 for home use can be effectively used as a power source for charging the vehicle 11 without a large-scale construction of electrical facilities.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field of a power supply device that can charge an electrically powered vehicle using a combination of power from a storage battery charged with commercial power supplied from an electric power company and commercial power. .

DESCRIPTION OF SYMBOLS 1 House 2 Electric wire 3 Power receiving part 4 Power distribution part 5 Electric load 6 Storage battery main body 7 Bidirectional charger 8 Storage battery 11 Vehicle 12 In-vehicle storage battery 13 Solar power generation device 21 Electric power meter 22 Switching means 23, 24 Breaker 25 Battery ECU
26 Vehicle Charger 27 On-vehicle ECU

Claims (3)

A storage battery charged with grid power from a power supply source;
A bidirectional charger for supplying electric power to a vehicle while converting the electric power stored in the storage battery into alternating current and supplying the electric load to the house,
A vehicle charger that supplies electric power stored in the storage battery to an electrically powered vehicle via a path different from the bidirectional charger;
When the vehicle is connected to the storage battery, based on the on-board storage battery mounted on the vehicle and the state of charge of the storage battery, the bidirectional battery and the storage battery supplied to the vehicle from the vehicle charger And a control means for controlling the distribution of the electric energy. The power supply device according to claim 1,
A supply system for connecting the grid power to the electrical load of the house;
A power supply apparatus comprising: selection means for selecting electric power from the bidirectional charger and system electric power from the supply system and supplying the electric power to the electric load. The power supply device according to claim 2,
The power system is characterized in that the grid power is midnight power from an electric power company or electric power obtained from power generation means for houses.

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