JP2017085763A - Vehicle charge system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle charge system capable of continuing charging a vehicle without stopping a battery even when outage of a power system occurs.SOLUTION: A vehicle charge system comprises: a battery 2 for supplying power to a charge stand 1 at the time of outage of a system; a transformer 3 for performing voltage transformation on voltage output from the battery 2; a first measurement apparatus 7 for measuring current output from the battery 2; and a communication apparatus 8 for communicating a value of the current to the charge stand 1. The charge stand 1, depending on the communicated value of the current, controls a duty ratio of a CPLT signal and continues charging within a range of power capacity of the battery 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle charging system capable of continuing charging from a battery to a vehicle even when a power system fails.

  The vehicle charging system is a system that charges a vehicle (electric vehicle) with electric power supplied from an electric power system. However, as shown in Patent Document 1, a vehicle charging system has been proposed in which a photovoltaic power generation device and a battery are incorporated so that charging of the vehicle can be continued even when the power system is interrupted. .

  However, the voltage that can be used by the vehicle charging station is 200V, whereas the voltage output from the battery is generally 100V. For this reason, there is a problem that electric vehicles such as EV and PHV cannot be charged unless a dedicated battery is used.

  There are also electric vehicles that can be charged at 100V, but the battery's electric capacity is generally about 1.5kW, so it is connected to a charging station for vehicles that consumes a maximum of 3.2kW (200V x 16A). Then, there was a possibility that the battery would stop.

JP 2011-97803 A

  Accordingly, an object of the present invention is to solve the above-described conventional problems, and to provide a vehicle charging system that can continue charging a vehicle without stopping the battery even when the power system fails. It is.

  The vehicle charging system of the present invention, which has been made to solve the above problems, includes a battery that supplies power to a charging station in the event of a system power failure, a transformer that transforms a voltage output from the battery, and an output from the battery And a communication device that communicates the current value measured by the first measurement device to the charging stand, and the charging stand can supply current to the vehicle according to the communicated current value. It has a function of controlling the value and continuing charging within the range of the power capacity of the battery.

  In the vehicle charging system according to the second aspect of the present invention, in the first aspect of the invention, the battery supplies power to an important load other than the charging station at the time of a power failure of the system. If the difference between the current value measured by the first measurement device and the current value measured by the second measurement device is less than the minimum required current value of the charging stand, the power supply to the charging stand is provided. It is characterized by stopping.

  According to a third aspect of the present invention, there is provided a vehicle charging system according to the first or second aspect, wherein the transformer and the communication device are housed in a relay panel.

  According to the vehicle charging system of the present invention, power can be supplied to the charging station using a general battery having an output voltage of 100 V, so that charging of the vehicle can be continued even when the power system fails. it can. In addition, the charging station controls the current value that can be supplied to the vehicle in accordance with the communicated current value, and continues charging within the range of the battery power capacity, so that the battery is not damaged.

  According to the invention of claim 2, it is possible to supply electric power from the battery to an important load other than the charging station at the time of a power failure, and when the remaining amount of the battery is reduced, the electric load is more important than the vehicle charge. Since power feeding is performed with priority, power feeding to an important load can be continued.

  According to the invention of claim 3, since the transformer and the communication device are housed inside the relay panel, it is possible to easily cope with an existing charging stand by adding this relay panel.

It is a circuit block diagram which shows 1st Embodiment. It is a circuit block diagram which shows 2nd Embodiment. It is a circuit block diagram which shows the modification of 2nd Embodiment. It is a circuit block diagram which shows 3rd Embodiment.

Embodiments of the present invention will be described below.
FIG. 1 is a circuit configuration diagram showing a first embodiment of a vehicle charging system according to the present invention, in which 1 is a charging station for charging a vehicle, and 2 is for supplying power to the charging station 1 during a system power failure. It is a battery. Since the battery 2 is a general battery having an output voltage of 100V, the output voltage of the battery 2 is transformed to 200V by the transformer 3 and then supplied to the charging stand 1.

  Normally, the battery 2 is charged from the grid via the distribution board 6 and can be provided with a function of discharging at high load. The battery 2 is charged by using low-cost midnight power, and daytime power peak shift is performed. Make it possible. However, as described below, at the time of a power failure, charging is performed from the solar power generation device via the power conditioner 5 and power is supplied to the charging stand 1.

  In this embodiment, the solar panel 4 is connected to the battery 2 via the power conditioner 5, and continuous power supply to the charging station 1 is possible even when the power system fails. In the embodiment, the power conditioner 5, the battery 2, and the like are always connected to the distribution board 6, but may be connected only when a power failure occurs in the system. The battery 2 may be one that repeatedly charges and discharges while ensuring a remaining amount equal to or greater than a certain value.

  As indicated by a broken line in FIG. 1, power is supplied from the distribution board 6 to the charging stand 1 during normal times, and the charging stand 1 charges the vehicle (electric vehicle) as in the conventional case. However, when a power failure occurs in the power system, power is supplied from the battery 2 to the charging station 1 via the transformer 3 as indicated by a solid line in FIG.

  On the output side of the battery 2, there are a first measuring device 7 that measures the current flowing from the battery 2 to the charging station 1, and a communication device 8 that communicates the current value measured by the first measuring device 7 to the charging station 1. Is provided. The current can be measured using a known current measuring means such as a CT or a Hall element. The power capacity of the battery 2 can be set in the communication device 8 in advance.

  The charging station 1 controls the duty ratio of the CPLT signal according to the current value communicated from the communication device 8, and controls the current value that can be supplied to the vehicle. The CPLT signal is conventionally used for communication between the vehicle and the charging station 1 and controls the start and stop of charging. However, the charging power can be controlled by changing the duty ratio of the pulse signal. In the present invention, the charging current to the vehicle is controlled by changing the duty ratio of the CPLT signal, and charging is continued within the range of the power capacity of the battery 2. For this reason, although the charging speed is lower than normal, charging of the vehicle can be continued without stopping the battery 2.

  FIG. 2 is a circuit configuration diagram showing a second embodiment of the vehicle charging system of the present invention. In the second embodiment, the battery 2 supplies power to the important load 9 other than the charging station 1 at the time of a power failure of the system. A second measuring device 10 that measures the value of the current flowing through the important load 9 is connected. A user of the distribution board can freely set what the important load 9 is, for example, an emergency light or a refrigerator.

  In the second embodiment, as shown in FIG. 3, another distribution board 6a can be connected as an important load. Important loads are intensively connected to the distribution board 6a. A second measuring device 10 for measuring the current value flowing through the distribution board 6a is connected. In normal times, electricity is supplied from the distribution board 6 to another distribution board 6a, but in an emergency such as a power failure, electricity is supplied from the battery 2 to another distribution board 6a.

  The current value supplied to the important load 9 measured by the second measuring device 10 is input to the communication device 8 together with the current value measured by the first measuring device 7. The communication device 8 calculates the difference between the current value measured by the first measuring device 7 and the current value measured by the second measuring device 10. The current value measured by the first measuring device 7 means the total output from the battery 2, and the current value measured by the second measuring device 10 means the output to the important load 9. Therefore, the difference is electric power that can be supplied to the charging station 1, but the charging station 1 has a minimum required current value, and charging cannot be performed below the minimum required current value.

  For this reason, when the difference between the current value measured by the first measuring device 7 and the current value measured by the second measuring device 10 is less than the minimum required current value of the charging station 1, the communication device 8 moves to the charging station 1. Is stopped and the load priority mode is entered. For this reason, the battery 2 supplies power only to the important load 9. However, if the difference between the current value measured by the first measuring device 7 and the current value measured by the second measuring device 10 is larger than the minimum required current value of the charging station 1, the minimum required current value of the charging station 1 The above charging is performed.

  In the first and second embodiments described above, the installation location of the transformer 3 and the communication device 8 is not specified. However, in the third embodiment shown in FIG. 4, these are housed inside the casing of the relay panel 11. For this reason, there is an advantage that the vehicle charging system of the present invention can be easily constructed only by adding the relay panel 11 to the existing equipment and connecting the first measuring device 7 and the second measuring device 10.

  As described above, according to the present invention, it is possible to continue charging the vehicle without damaging the battery 7 due to overload even when the power system fails. The charged vehicle can be used for movement, and can travel to a place where a power source is required to supply power to the load from the in-vehicle battery.

DESCRIPTION OF SYMBOLS 1 Charging stand 2 Battery 3 Transformer 4 Solar panel 5 Power conditioner 6 Distribution board 6a Another distribution board 7 1st measuring equipment 8 Communication equipment 9 Important load 10 2nd measuring equipment 11 Relay board

Claims (3)

  A battery that supplies power to the charging station in the event of a power failure in the system, a transformer that transforms the voltage output from the battery, a first measuring device that measures the current output from the battery, and the first measuring device A communication device that communicates the current value to the charging station, and the charging station controls the current value that can be supplied to the vehicle according to the communicated current value, and has a function of continuing charging within the range of the battery power capacity. A vehicle charging system comprising:   The battery supplies power to an important load other than the charging station at the time of a power failure of the system, and includes a second measuring device that measures a current value flowing through the important load, and the current value measured by the first measuring device 2. The vehicle charging system according to claim 1, wherein when the difference from the current value measured by the second measuring device is less than the minimum required current value of the charging station, power supply to the charging station is stopped.   The vehicle charging system according to claim 1 or 2, wherein the transformer and the communication device are housed inside a relay panel.