JP5791466B2 - Electric vehicle charging system - Google Patents

Description

  The present invention relates to an electric vehicle charging system for charging an electric vehicle in a general house.

  In recent years, with the popularization of electric vehicles, charging systems for charging electric vehicles using a household power source in general homes are becoming popular. Such a charging system is provided with a setting for charging at night when normal power consumption is low and the power charge is set low (see, for example, Patent Document 1).

JP 2010-115038 A

However, even at night when the amount of power used is low, if a device that requires a large amount of power, such as a midnight water heater or an IH cooking heater, operates simultaneously, the amount of power used increases and exceeds the rated capacity of the house. A situation where the limiter is shut off is considered.
Since it is necessary to avoid this situation, measure the current used in the house during charging, and temporarily charge the electric vehicle when the current used by the entire household approaches the contracted current amount with the power company or the rating of the main breaker. Although a system for stopping the operation and reducing the use current can be considered, there is a case where the electric vehicle shifts to a sleep mode in which energy consumption is suppressed by stopping charging even if it is temporary. In an electric vehicle that performs such mode switching, a blank time during which the charging operation is not temporarily accepted during mode switching occurs, and a situation in which recharging is not performed smoothly has been considered.

  Therefore, in view of such a problem, the present invention has an object to provide an electric vehicle charging system capable of reliably performing charging when resuming charging even when current supply is temporarily stopped.

In order to solve the above-mentioned problems, the invention of claim 1 is an electric vehicle charging system for charging an electric vehicle using a commercial power source drawn into a house, wherein an electric current flowing through a main breaker of a distribution board is obtained. A current measuring means for measuring, a switching contact portion for opening and closing a charging path from the distribution board to the electric vehicle, a current sensor for detecting a current of the charging path, and the current measuring means during charging of the electric vehicle A charge path control unit that opens and closes the switching contact when an overcurrent exceeding a first current threshold is detected; and an opening and closing operation unit that manually opens and closes the switching contact and receives the overcurrent detection After the charging path control unit operates the switching contact part, if no current flows through the charging path even if the opening / closing operation part is closed, the charging path control unit Switch to open for a certain time Characterized in that it is again closing operation after the lapse.
According to this configuration, even when a charging start operation is performed during a blank time period of an electric vehicle that cannot be charged, such as during an operation for switching to a sleep mode, the charging current state is recognized and the closed switching contact portion is once opened. Therefore, the charging operation is performed again while avoiding the blank time period. Therefore, charging is reliably restarted.

The invention of claim 2 is an electric vehicle charging system for charging an electric vehicle using a commercial power source drawn into a house, wherein the current measuring means for measuring the current flowing through the main breaker of the distribution board, An open / close contact portion that opens and closes a charging path from the electrical panel to the electric vehicle, a current sensor that detects a current in the charging path, and an overcurrent in which the current measuring unit exceeds a predetermined first current threshold during charging of the electric vehicle Is detected, the opening / closing contact portion is opened, and then the opening / closing contact portion is closed when the current flowing through the main breaker falls below a predetermined second current threshold value smaller than the first current threshold value. And the charging path control unit switches the switching contact part to open and opens a fixed time when no current flows through the charging path when the switching contact part is closed. Characterized in that it is closing operation again Once spent.
According to this configuration, even when charging is resumed during a blank time zone of an electric vehicle that cannot be charged, such as during a switching operation to sleep mode, it is recognized from the state of the charging current, and the closed switching contact portion is temporarily opened. Since the switching operation is performed again, the charging operation is performed again while avoiding the blank time period. Therefore, charging is reliably restarted.

  According to the present invention, even when charging of an electric vehicle is resumed in a blank time zone of an electric vehicle that cannot be charged, such as during sleep mode switching operation, the charging switch recognizes it from the state of charging current and temporarily closes the closed switching contact portion. In order to switch to open and close again, the charging operation is performed again avoiding the blank time period. Therefore, charging is reliably restarted.

It is a block diagram which shows an example of the electric vehicle charging system which concerns on this invention. It is a circuit block diagram of a charge control apparatus. It is a timing chart figure from charge stop to charge resumption.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of an electric vehicle charging system according to the present invention. 1 is a distribution board for managing a household power source to which a lead-in line L1 from a commercial power source is connected, 2 is an electric vehicle, and 3 is A current monitoring device that monitors current used in the home, 4 is a charging control device that controls charging of the electric vehicle 2, and 5 is a charging box that connects the electric vehicle 2 via the charging cable 6.

The distribution board 1 includes a current limiter 11 that shuts off when a contract current with a power company is exceeded, a main breaker 12 that shuts off when an overcurrent or a leakage occurs, and a branch breaker to which various electric devices in the home are connected. 13, 13... A current transformer 14 for measuring a current used at home is assembled.
The secondary side of the current limiter 11 to which the lead-in line L1 is connected is connected to the primary side of the main circuit breaker 12 by the main electric circuit L2, and the secondary side of the main circuit breaker 12 is individually branched by the copper bar constituting the main electric circuit L2. It is connected to the breakers 13, 13,. The current transformer 14 is disposed on the primary side of the current limiter 11 and detects a current flowing through the lead-in line L1 (and the main electric circuit L2). The charge control device 4 is connected to the electric wire L3 connected to the secondary side of one branch breaker 13, and the secondary side is connected to the charging box 5 via the electric wire L4. The electric wires L3 and L4 and the charging cable 6 constitute a charging path for charging the electric vehicle 2.
The current transformer 14 only needs to be able to detect the entire current used at home, and may be the secondary side of the current limiter 11 or the secondary side of the main breaker 12.

  The current monitoring device 3 outputs a control signal to the charging control device 4 based on the current information of the current transformer 14. Specifically, a first current threshold value set to a current value of 80 to 90% that is slightly smaller than a current value at which the current limiter 11 operates with a built-in CPU, and is sufficiently smaller than the first current threshold value, for example, 50 A second current threshold value set to a current value of% is provided, and when the current value detected by the current transformer 14 exceeds the first current threshold value, a charge stop signal is output to the charge control device 4 and the second current threshold value is set. When the current threshold value is below, a charge start signal is output. This control signal is transmitted to the current control device 4 through the signal line L5.

  The charging box 5 is installed in a garage or the like, and includes an outlet (not shown) for connecting a charging cable 6 for charging the electric vehicle 2.

  FIG. 2 shows a circuit block diagram of the charging control device 4. As shown in FIG. 2, the charging control device 4 includes an opening / closing contact portion 16 made of, for example, a power relay that opens and closes the charging path, a current sensor 17 that detects a current flowing through the charging path, A timer circuit 18 for managing operation timing, an open / close control unit 19 including a CPU for controlling the open / close contact unit 16, a buzzer 20 for generating an alarm sound, an operation unit 21 for manually operating the open / close contact unit 16 and the like are provided.

The operation of the electric vehicle charging system configured as described above is as follows. FIG. 3 is a timing chart showing the relationship between the switching contact 16 from charge stop to charge restart, the charging state of the electric vehicle 2 and the mode of the electric vehicle 2, and will be described with reference to this figure.
Note that P1 to P4 shown in FIG. 3 indicate switching operation points of the switching contact portion 16, P1 is an opening operation point, P2 is a closing operation point, P3 is an opening operation point, and P4 is a closing operation point. Show.

  First, when the electric vehicle 2 is connected to the charging box 5 via the charging cable 6 and the timer circuit 18 reaches a predetermined start time set in advance, or the operation unit 21 performs a start operation (closing of the switching contact unit 16). When the operation is performed, the switching contact portion 16 is closed by the control of the switching control unit 19 and charging is started. Thereafter, when the timer circuit 18 reaches a predetermined charging end time set in advance or when the operation unit 21 is operated to end (opening operation of the switching contact 16), the charging ends.

  During this charging operation, the current monitoring device 3 monitors the current in the main electric circuit L2 with the current transformer 14, and detects an overcurrent in which the current flowing through the main electric circuit L2 exceeds the first current threshold value, the charging control device 4 In response, a charge stop signal is output. The switching control unit 19 that has received this charge stop signal opens the switching contact 16 to stop charging the electric vehicle 2 (point P1). At this time, the buzzer 20 sounds an alarm sound.

  On the other hand, the electric vehicle 2 in the charging mode state shifts to the normal sleep mode in order to minimize power consumption when a certain time (here, 5 minutes) T1 elapses after charging is stopped. This transition to the sleep mode requires a transition time of about 1 second, and during this time it becomes a blank time and does not react even if a charging voltage is applied, and charging is not performed. In FIG. 3, ΔT indicates this transition time.

Therefore, the current of the main electric circuit L2 decreases to the second current threshold value or less after 5 minutes, which is the same as the time for shifting to the sleep mode after the charging is stopped, and the switching control unit 19 causes the switching contact unit 16 to close. When the sleep mode transition timing coincides with the charging resumption timing, charging does not start.
This is the same in the case of manual operation. When charging is started at the timing of transition to the sleep mode after charging is stopped, a situation in which charging is not started occurs.

When the switching controller 19 closes the switching contact 16 (point P2) and the current sensor 17 does not detect the charging current and the time continues for T2 for a certain time (for example, 60 seconds), the switching contact 16 Is opened (point P3), and the application of voltage to the electric vehicle 2 is stopped.
Thereafter, when a certain time (for example, 5 seconds) T3 elapses, the switching contact 16 is closed again (point P4). At this stage, since the transition to the sleep mode is completed, the electric vehicle 2 detects the applied voltage and charging is resumed.

As described above, even when the charging of the electric vehicle 2 is resumed during the blank time period during which the charging cannot be performed, such as during the sleep mode switching operation, the charging is recognized from the state of the charging current, and the closed switching contact 16 is temporarily switched to open. In order to perform the closing operation again, the charging operation is performed again while avoiding the blank time period. Therefore, charging can be reliably restarted.
In addition, even in the case of automatic resumption in which charging is resumed by monitoring the current in the main electric circuit L2, even when resuming by manual operation, the open / close contact portion 16 is controlled to open and close by monitoring the presence or absence of current in the charging path. Charging can be reliably restarted regardless of manual / automatic.

In the above embodiment, the second current threshold value is provided and the control for resuming charging is performed when the current falls below this value. However, the second current threshold value is not provided, and the resumption of charging is performed by the operation unit 21. You may carry out only by operation.
Moreover, the distribution board 1 is configured to include the current limiter 11, but when the current limiter 11 is not provided, the first current threshold and the second current threshold are based on the rated current of the main breaker 12. Should be set. Further, although the operation unit 21 is provided in the charging control device 4, it may be provided in the charging box 5.
Furthermore, the current monitoring device 3 and the charge control device 4 manage the state of the charging path, but both may be integrated.

  1 .... distribution panel 2 .... electric vehicle 3 .... current monitoring device (charging path control unit) 4 .... charging control device 11 .... main breaker 14, ... current transformer (current measuring means) 16, opening / closing contact part, 18 ... timer circuit, 19 ... opening / closing control part (charging path control part), 21 ... operating part (opening / closing operation part).

Claims (2)

An electric vehicle charging system for charging an electric vehicle using a commercial power source drawn into a house,
Current measuring means for measuring the current flowing through the main breaker of the distribution board;
An open / close contact portion for opening and closing a charging path from the distribution board to the electric vehicle;
A current sensor for detecting the current of the charging path;
A charging path control unit that opens the switching contact portion when the current measuring means detects an overcurrent exceeding a predetermined first current threshold during charging of the electric vehicle;
An open / close operation part for manually opening and closing the open / close contact part,
When the charging path control unit operates the switching contact after receiving the overcurrent detection, the charging path control is performed when no current flows through the charging path even when the switching operation unit is operated to close the switching path. The electric vehicle charging system is characterized in that the switch switches the open / close contact portion to open and closes it again after a predetermined time has elapsed. An electric vehicle charging system for charging an electric vehicle using a commercial power source drawn into a house,
Current measuring means for measuring the current flowing through the main breaker of the distribution board;
An open / close contact portion for opening and closing a charging path from the distribution board to the electric vehicle;
A current sensor for detecting the current of the charging path;
When the current measuring means detects an overcurrent exceeding a predetermined first current threshold during charging of the electric vehicle, the switching contact portion is opened, and then a current flowing through the main breaker is smaller than the first current threshold. A charge path control unit that closes the switching contact part when the value becomes lower than the second current threshold value,
The charging path control unit switches the switching contact part to open and closes it again after a predetermined time if no current flows through the charging path when the switching contact part is closed. Electric vehicle charging system.

Images