JP2018074752A - Charge and discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a charge and discharge device capable of determining whether or not a connector is connected with an electric vehicle after connecting the connector with the electric vehicle.SOLUTION: The charge and discharge device includes a connector connected to a charging port of a vehicle having a storage battery thereon and executes charging and discharging to the storage battery by connecting the connector to the charging port. The charge and discharge device further includes an analog line applied with a power supply voltage on vehicle side by connecting the connector to the charging port; a ground line (32f) applied with a ground voltage (FG) on vehicle side by connecting the connector to the charging port; and a current detector (51) disposed at the ground line (32f) and detecting a current value of an electric current running through the ground line (32f).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a charging / discharging device for charging / discharging an electric vehicle or the like.

  In recent years, electric vehicles driven by electric power have begun to spread in place of vehicles using internal combustion engines that have a large environmental load due to waste gas. An electric vehicle is equipped with a large-capacity storage battery that stores electric power used during traveling.

  The electric vehicle is charged and discharged from the charging / discharging device to the storage battery. The charging / discharging device connects the connector to a charging port provided in the electric vehicle, and performs charging / discharging with respect to the storage battery mounted on the electric vehicle.

  Patent Document 1 discloses a charging system using an interface configuration between a charger and an electric vehicle that conforms to the CHAdeMO (registered trademark) specification.

Japanese Patent Application Laid-Open No. 2011-114962

  The charging sequence in the CHAdeMO specification charging system is as follows.

  First, the charging sequence starts when the user presses the start button of the charger. When the start button is pressed, the charger sends a charge start signal to the electric vehicle side relay (d1) ("d1" is a symbol generally used for the relay in the CHAdeMO specification. Hereinafter, symbols commonly used for specific elements in the CHAdeMO specification are appended together with (). In an electric vehicle, when a charge start signal is sent, the photocoupler (f) is excited. As a result, the electric vehicle recognizes that the charging operation has started, and sends various information to the charger through CAN (Controller Area Network) communication. Thereafter, a charging preparation operation such as an insulation confirmation test is performed while performing CAN communication and other signal exchanges between the charger and the electric vehicle. When the charging preparation operation is completed, charging is started.

  However, according to the above charging sequence, the charger can confirm the connection with the electric vehicle at the stage of receiving information by CAN communication from the electric vehicle side. And in order to start CAN communication, a user needs to push the start button of a charger, after connecting the connector of a charger to the charging port of an electric vehicle beforehand. Therefore, the user first walks to the charger side, picks up the connector of the charger, then moves to the electric vehicle side with this connector and connects the connector to the charging port of the electric vehicle, and again, the electric vehicle side To the charger side, the charging sequence must be started by pressing the start button of the charger. This is very troublesome for the user.

  Temporarily, when the connector is connected to the electric vehicle without going through the above-described procedure, that is, the CAN communication is performed after the start button is pressed to turn on the relay (d1) to excite the photocoupler (f). Therefore, if the connection can be confirmed in the charger, it is possible to construct a charging sequence that does not need to force the user to go back and forth between the charger and the electric vehicle. It becomes possible.

  On the other hand, the ON operation of the relay (d1) of the charger is not triggered by the pressing of the start button by the user, but is performed periodically, for example, so that the above charging sequence is executed and the connection is confirmed by CAN communication. It is also possible. However, if it does in this way, since it takes time until the CAN communication is started after the relay (d1) is turned on, a time lag until the connection confirmation occurs. Furthermore, since the power consumption of the auxiliary battery on the electric vehicle side is consumed when the above charging sequence is executed, there is a concern that the auxiliary battery may become insufficiently charged. For this reason, turning on the relay (d1) for connection confirmation is wasteful in terms of both time and cost.

  In addition, the charger may be controlled by a host device that performs charging management schedule management by the charger. Even in this case, if the host device cannot determine the connection without executing the charging sequence, the host device must first execute the charging sequence and check the connection when the host device determines the start of charging. For this reason, control by the host device becomes inefficient, and it becomes difficult to establish an operation schedule for the charger on the host device side.

  In view of the above problems, an object of one embodiment of the present invention is to realize a charge / discharge device that can determine that a connector is connected to the electric vehicle at the time when the connector is connected to the electric vehicle.

  In order to solve the above-described problem, a charging / discharging device according to an aspect of the present invention includes a connector connected to a charging port of a vehicle on which a storage battery is mounted, and the connector is connected to the charging port. A charging / discharging device that charges and discharges a storage battery, and is a signal line for transmitting and receiving an analog signal. When the connector is connected to the charging port, a voltage from the power source on the vehicle side is applied. A signal line and a ground line grounded on the vehicle side by connecting the connector to the charging port, a connection circuit connected from the signal line to the ground line, and disposed in the connection circuit And a current detection unit that detects a current value of a current flowing through the connection circuit.

  According to the above configuration, when a connector is connected to the charging port, a current flows through the ground line. It can be determined that the connector is in a state connected to the charging port of the vehicle by detecting the current flowing through the ground line by the current detection unit.

The connection circuit is connected to another signal line that causes a current to flow into the ground line and changes the amount of current to flow into the ground line as the sequence of the charge preparation work progresses.
It is preferable to include a determination unit that refers to the sequence and determines whether or not the sequence is normally executed based on a detection result of the current detection unit.

  It is preferable that the current detection unit detects current values of a current flowing in a first direction from the connector toward the charging port and a current flowing in the second direction from the charging port toward the connector. .

  The current detection unit preferably includes a first photocoupler that detects a current flowing in the first direction and a second photocoupler that detects a current flowing in the second direction.

  After the connector is locked to the charging port or after CAN communication between the charging / discharging device and the vehicle is started, the connector is connected to the charging port regardless of the detection result of the current detection unit. It is preferable to include a determination unit that determines that the image has been determined.

  According to one embodiment of the present invention, it is possible to realize a charge / discharge device that can determine that a connector is connected to the electric vehicle at the time when the connector is connected to the electric vehicle.

It is a block diagram which shows schematic structure of the charging / discharging apparatus which concerns on one Embodiment of this invention. It is the schematic which shows the interface structure between a connector and a charging port. It is a circuit diagram which shows the structure of a pair of photocoupler.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals.

  The present embodiment relates to a system including a charging / discharging device and a vehicle charged / discharged by the charging / discharging device. In the present embodiment, the charging / discharging device and the vehicle perform charging / discharging by the CHAdeMO method, and the vehicle is an electric vehicle (EV (Electric Vehicle)).

  However, the present invention is also applicable to systems other than CHAdeMO, such as a combo (combined charging system) system. The vehicle targeted by the present invention is not limited to an electric vehicle, and may be a plug-in hybrid electric vehicle (PHEV).

  The present embodiment will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing a schematic configuration of a charge / discharge device 1 according to the present embodiment. The charging / discharging device 1 includes a charging / discharging device main body 10, a connector 20, and a cable 30. As shown in FIG. 1, when the connector 20 is connected to a charging port 41 of a vehicle (electric vehicle) 40, a storage battery (not shown) mounted on the vehicle 40 is charged / discharged. The charging / discharging device 1 is installed in a public facility or a private business facility, or in a parking lot of a general house or apartment.

  The charging / discharging device 1 charges the storage battery of the vehicle 40, discharges the storage battery of the vehicle 40, and supplies power from the vehicle 40 to a facility such as a home (V2H (Vehicle to Home) system). is there.

  The charging / discharging device main body 10 is for charging / discharging a storage battery mounted on the vehicle 40. The charging / discharging device main body 10 is connected to a commercial power system (not shown), and charges the storage battery of the vehicle 40 using power supplied from the commercial power system.

  The connector 20 is connected to the charging port 41 of the vehicle 40. The connector 20 has a mechanism that is locked to the charging port 41 of the vehicle 40 and does not come off from the charging port 41 when the storage battery of the vehicle 40 is charged / discharged. The lock by this mechanism is released by stopping the charge / discharge operation of the charge / discharge device 1.

  The cable 30 has one end connected to the charge / discharge device body 10 and the other end provided with a connector 20. The cable 30 includes a power line 31, an analog line 32, and a CAN signal line 33.

  The power line 31 supplies power from the charging / discharging device body 10 to the connector 20 and from the connector 20 to the charging / discharging device body 10 in order to charge / discharge the storage battery of the vehicle 40.

  The analog line 32 and the CAN signal line 33 transmit and receive various signals exchanged between the charging / discharging device main body 10 and the connector 20 when charging / discharging the storage battery of the vehicle 40. An analog signal is transmitted and received on the analog line 32. Signals exchanged through the analog line 32 and the CAN signal line 33 will be described later.

  FIG. 2 is a schematic diagram illustrating an interface configuration between the connector 20 and the charging port 41 when the connector 20 of the charging / discharging device 1 is connected to the charging port 41 of the vehicle 40. Since the interface configuration shown in FIG. 2 is a configuration known from the CHAdeMO standard or the like, a detailed description of the configuration and operation is omitted. In the following, description will be made centering on points that should be referred to in order to explain the characteristic portions of the charge / discharge device 1.

  As shown in FIG. 2, a relay (d1) 101, a relay (d2) 102, a photocoupler (j) 103, and a CAN circuit 104 are provided on the charge / discharge device 1 side. On the vehicle 40 side, a vehicle contactor 201, a photocoupler (f) 202, a photocoupler (g) 203, a photocoupler (h) 204, a photocoupler (k) 205, a CAN circuit 206, and a resistor (R4) 207 are provided. ing. Note that the resistor (R4) 207 may not be provided.

  Further, between the charging / discharging device 1 and the vehicle 40, the power line 31 including the positive potential side line 31a and the negative potential side line 31b, the charging / discharging connector 12V line 32a (power supply line), and the first work start / stop. The analog line 32 including the line 32b, the second work start / stop line 32c, the charge / discharge connector connection confirmation line 32d, the operation permission prohibiting line 32e, and the ground line 32f, and the CAN signal line 33 are provided. The charge / discharge connector 12V line 32a is included in the optional function configuration 300 that is selectively added to the interface configuration according to the CHAdeMO standard. The auxiliary storage battery 301 is a well-known auxiliary battery used for driving the system of the vehicle 40, and is mounted on the vehicle 40 separately from the large-capacity storage battery that stores electric power used when the vehicle 40 travels. . The vehicle 12V (VB) is supplied from the auxiliary storage battery 301. Further, the switch 302 is normally turned on. For example, during a power failure, the power stored in the auxiliary storage battery 301 is supplied to the charge / discharge device 1 side through the charge / discharge connector 12V line 32a. The charging / discharging device 1 operates a control unit that controls the charging / discharging operation of the charging / discharging device 1 using the power supplied from the auxiliary storage battery 301. The wraparound prevention circuit 303 is a circuit for preventing electric power from being supplied to the vehicle 40 from the charging / discharging device 12V (VA) via the charging / discharging connector 12V line 32a.

  It should be noted that the current detector 51 (current detection unit) and the determination circuit 52 (determination unit) connected to the ground line 32f are further provided on the charge / discharge device 1 side as shown in FIG. It is a point. The current detector 51 detects a current flowing through the charge / discharge connector connection confirmation line 32d after the connector 20 is connected to the charging port 41. The determination circuit 52 determines the connection of the connector 20 to the charging port 41 based on the detection result of the current detector 51.

  In the preparatory work for charging the charging / discharging device 1, conventionally, as shown in FIG. 2, when the relay (d 1) 101 on the charging / discharging device 1 side is first turned on, the photocoupler on the vehicle 40 side is first turned on. (F) 202 is driven, and the vehicle 40 detects that the relay (d1) 101 is turned on. When the vehicle 40 detects that the relay (d1) 101 is turned on, the vehicle 40 transmits a signal through the CAN signal line 33 in order to start CAN communication with the charge / discharge device 1. When the charging / discharging device 1 receives a CAN communication signal from the vehicle 40, the charging / discharging device 1 transmits a CAN communication signal to the vehicle 40.

  After the CAN communication between the charging / discharging device 1 and the vehicle 40 is thus established, the charging / discharging device 1 receives a charging permission signal from the vehicle 40 via the operation permission prohibiting line 32e, and the connector 20 is connected by the lock mechanism. Is locked to the charging port 41.

  Next, the charging / discharging device 1 turns on the relay (d2) 102 to inform the vehicle 40 of the completion of preparation of the charging / discharging device 1 to the vehicle 40 via the second work start / stop line 32c, and prepares for charging. Exit.

  As described above, conventionally, on the charging / discharging device 1 side, the connection of the connector 20 to the charging port 41 is recognized by CAN communication between the CAN circuit 104 and the CAN circuit 206. For this reason, after a user brings the connector 20 from the charging / discharging device 1 side to the vehicle 40 side in order to cause the charging / discharging device 1 to start charging the storage battery of the vehicle 40, the user connects the connector 20 to the vehicle 40. Then, it is normal that the charging / discharging device 1 is started again by operating the start button provided in the charging / discharging device 1 by returning to the charging / discharging device 1 from the vehicle 40 side again. .

  On the other hand, by providing the current detector 51, the charging / discharging device 1 determines the connection of the connector 20 to the charging port 41 without performing CAN communication or operating the start button by the user. Can do. Hereinafter, the configuration and function of the current detector 51 and the determination circuit 52 connected to the current detector 51 will be described.

  As shown in FIG. 2, the current detector 51 is connected to the ground line 32f and detects the current value of the current flowing through the ground line 32f. The current detector 51 can detect the current value of the current flowing through the ground line 32f in either the X1 direction or the X2 direction.

  When connector 20 of charging / discharging device 1 is connected to charging port 41 of vehicle 40, a path is formed from VB (vehicle 12V) to FG (frame ground) via ground line 32f. Specifically, this is a path connecting VB → light emitting diode of photocoupler (h) 204 → charge / discharge connector connection confirmation line 32d → ground line 32f → FG. In other words, a connection circuit connected from the charge / discharge connector connection confirmation line 32d to the ground line 32f is configured. By forming the above path (hereinafter referred to as “current transmission path”) on this connection circuit, a current flows through the charge / discharge connector connection confirmation line 32d and the ground line 32f.

  The current detector 51 detects the current value of this current and outputs a detection signal s1 indicating the detected current value. The determination circuit 52 can determine that the connector 20 of the charge / discharge device 1 is connected to the charging port 41 of the vehicle 40 based on the output of the detection signal s1.

  Furthermore, in addition to the detection signal s1, the determination circuit 52 also receives sequence information including the above-described charging preparation work sequence. The determination circuit 52 can specify the step in which the sequence of the above-described charging preparation work has proceeded by referring to the sequence information. When the detection signal s <b> 1 is input from the current detector 51, the determination circuit 52 refers to the sequence information and identifies the step currently being performed. The determination circuit 52 determines whether or not the current value indicated by the detection signal s1 is appropriate as the current value of the current flowing through the ground line 32f in the specified step. If it is determined to be valid, the determination result is notified to the charging / discharging device 1 by the output of the determination signal s2.

  For example, when both the relay (d1) 101 and the relay (d2) 102 are turned on, VA → first work start / stop line 32b → photocoupler (g) 203 light emitting diode → second work start / stop line 32c → ground line 32f → A route connecting FG is formed. In other words, a connection circuit that connects the first work start / stop line 32b to the ground line 32f is configured. The determination circuit 52 determines whether or not the current value indicated by the detection signal s1 is appropriate as the current value of the current flowing through the ground line 32f when both the relay (d1) 101 and the relay (d2) 102 are turned on. To do. If it is determined to be appropriate, the determination circuit 52 outputs a determination signal s2. In this way, it is possible to determine whether or not the relay (d1) 101 and the relay (d2) 102 are normally turned on. The transmission / reception of the charging permission signal via the operation permission prohibiting line 32e can be similarly determined.

  In other words, as the charging preparation work sequence progresses, the connection circuit formed by the ground line 32f and the other analog lines 32 connected to the ground line 32f changes. As the connection circuit changes, the amount of current flowing into the ground line 32f and its direction also change. Therefore, the determination circuit 52 can determine whether the sequence of the charging preparation work is normally executed based on the sequence information, the amount of current detected by the current detector 51, and the current direction.

  For the detection of the current value of the current flowing through the ground line 32f, a comparator or a high CTR photocoupler is used instead of the above-described current detector 51, or the current value after A / D conversion is measured by the CPU. May be.

  For example, instead of the current detector 51 described above, a pair of photocouplers 53 (current detection units) including a first photocoupler 531 and a second photocoupler 532 may be used as shown in FIG. The first photocoupler 531 detects a current flowing in the X1 direction, and the second photocoupler 532 detects a current flowing in the X2 direction. The first photocoupler 531 and the second photocoupler 532 each output the detection signal s1 to the determination circuit 52.

  When the determination circuit 52 determines that the connector 20 of the charging / discharging device 1 is connected to the charging port 41 of the vehicle 40 and the connector is locked, the detection signal s1 is thereafter applied until the connector is released. What is necessary is just to determine with the connector 20 of the charging / discharging apparatus 1 being the state connected to the charging port 41 of the vehicle 40 irrespective of the presence or absence of the output of. Moreover, it is good also after CAN communication establishment, not after connector locking. This is because it is clear that the connector 20 is connected to the charging port 41 after the connector is locked or after CAN communication is established. By doing so, even when the output of the detection signal s1 is stopped due to the fluctuation of the current flowing through the ground line 32f, an erroneous determination by the determination circuit 52 is not caused.

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

  For detection of the current flowing through the ground line 32f, a comparator or a high CTR photocoupler may be used instead of the above-described current detector 51, or the current value after A / D conversion may be measured by the CPU.

  The charging / discharging device 1 may be a charging device that charges the storage battery of the vehicle 40 or a discharging device that discharges the storage battery of the vehicle 40 and supplies power from the vehicle 40 to a facility such as a home.

  DESCRIPTION OF SYMBOLS 1 Charging / discharging apparatus, 10 Charging / discharging apparatus main body, 20 Connector, 30 Cable, 31 Power line, 31a Positive electric potential side line, 31b Negative electric potential side line, 32 Analog line (signal line), 32a Charging / discharging connector 12V line, 32b 1 work start stop line, 32c second work start stop line, 32d charge / discharge connector connection confirmation line, 32e operation permission prohibition line, 32f grounding line, 33 CAN signal line, 40 vehicle, 41 charging port, 51 current detector (current) (Detection unit), 52 determination circuit (determination unit), 53 pair of photocouplers (current detection unit), 101 relay (d1), 102 relay (d2), 103 photocoupler (j), 201 vehicle contactor, 202 photocoupler ( f), 203 Photocoupler (g), 204 Photocoupler (h), 205 Photocoupler (k), 104 206 CAN circuit, 207 R4 resistors, 300 optional functional configuration, 531 first photocoupler, 532 second photocoupler

Claims (5)

A charging / discharging device comprising a connector connected to a charging port of a vehicle equipped with a storage battery, and charging / discharging the storage battery by connecting the connector to the charging port,
A signal line for transmitting and receiving an analog signal, wherein the connector is connected to the charging port so that a voltage from a power source on the vehicle side is applied; and
A connection circuit connected to the ground line from the signal line, including a ground line grounded on the vehicle side by connecting the connector to the charging port;
A charge / discharge device, comprising: a current detection unit that is disposed in the connection circuit and detects a current value of a current flowing through the connection circuit. The connection circuit is connected to another signal line that causes a current to flow into the ground line and changes the amount of current to flow into the ground line as the sequence of the charge preparation work progresses.
The charging / discharging device according to claim 1, further comprising: a determination unit that refers to the sequence and determines whether the sequence is normally executed based on a detection result of the current detection unit. .   The current detection unit detects current values of a current flowing in a first direction from the connector toward the charging port and a current flowing in a second direction from the charging port toward the connector of the ground line. The charge / discharge device according to claim 1 or 2.   The charge / discharge according to claim 3, wherein the current detection unit includes a first photocoupler that detects a current flowing in the first direction and a second photocoupler that detects a current flowing in the second direction. apparatus.   After the connector is locked to the charging port or after CAN communication between the charging / discharging device and the vehicle is started, the connector is connected to the charging port regardless of the detection result of the current detection unit. The charging / discharging apparatus of any one of Claims 1-4 provided with the determination part which determines with a thing.

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