JP2018085898A - Charge and discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge and discharge device that can determine connection of a connector to an electric vehicle.SOLUTION: The charge and discharge device includes a connector connected to a charging port of a vehicle with a storage battery mounted and charges and discharges a storage battery by connecting the connector to the charging port. The charge and discharge device includes: a first work start stop line; a relay (d1) (101) arranged on the first work start stop line; a resistance (51) connected parallel to the relay (d1) (101); and a switching element (54) to be driven on the basis of electric potential applied to the first work start stop line through the resistance (51).SELECTED DRAWING: Figure 3

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 for charging / discharging a storage battery, wherein a path leading to a ground potential on the vehicle side is configured by connecting the connector to the charging port, and a starting potential indicating the start of a charging / discharging preparation operation is A signal line for transmitting to the vehicle, a main relay disposed on the signal line and turned on to transmit the start potential, and a resistor connected in parallel to the main relay; And a potential fluctuation detection unit that detects a potential fluctuation at a position closer to the connector than the main relay in the signal line.

  The potential fluctuation detection unit can be realized by a switching element that performs a switching operation according to the potential fluctuation. This switching element can be realized by a transistor that performs a gate operation with a potential on the connector side of the signal line with respect to the main relay.

  The current value of the current flowing through the resistor may be smaller than the current value necessary for driving the photocoupler provided in the vehicle that is driven when the main relay is turned on.

  According to the above configuration, when the main relay is off, the potential on the connector side of the signal line with respect to the main relay varies before and after connecting the connector to the charging port. By detecting this potential variation by the potential variation detection unit, it is possible to determine whether or not the connector is connected to the charging port.

  It is preferable to provide a slave relay connected in series with the resistor.

  After the connector is locked to the charging port or after the 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 by the potential fluctuation detection unit. It is preferable to include a determination unit that determines that the operation has been performed.

  A charging / discharging device according to another aspect of the present invention includes a connector connected to a charging port of a vehicle on which a storage battery is mounted, and charging / discharging the storage battery by connecting the connector to the charging port. A discharge device for connecting the connector to the charging port so as to form a path leading to the ground potential on the vehicle side and to transmit a start potential indicating the start of a charge / discharge preparation operation to the vehicle A first signal line, a second signal line to which a feedback potential according to a start potential transmitted to the vehicle side by the first signal line is transmitted by connecting the connector to the charging port, A first main relay disposed on the first signal line and turned on to transmit the start potential, a resistor connected in parallel to the first main relay, and disposed on the second signal line Second main Comprising a chromatography, a potential variation detecting section for detecting a potential change of the site of the connector side of the second main relay in the second signal line.

  According to the said structure, there exists an effect similar to the charging / discharging apparatus which concerns on 1 aspect of this invention.

  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 detection part. It is a circuit diagram which shows the structure of the modification of the said detection part. It is a block diagram which shows schematic structure of the modification of the said charging / discharging apparatus.

  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 following describes the present embodiment 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. Signals exchanged via 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, on the charge / discharge device 1 side, relay (d1) 101 (main relay, first main relay), relay (d2) 102 (second main relay), photocoupler (j) 103, and CAN A circuit 104 is provided. 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.

  In addition, the charging / discharging device 1 is provided with a power line corresponding to the power line 31 including the positive potential side line 31 a and the negative potential side line 31 b of the vehicle 40. The charge / discharge device 1 also includes a charge / discharge connector 12V line 32a, a first work start / stop line 32b (signal line, first signal line), a second work start / stop line 32c (second signal line), a charge / discharge connector. The above-described analog line 32 including the connection confirmation line 32d, the operation permission prohibiting line 32e, and the ground line 32f, and the above-described CAN signal line 33 are provided. The vehicle 40 is provided with analog lines and CAN signal lines corresponding to the analog lines 32 and the CAN signal lines 33. When the connector 20 and the charging port 41 are connected, the lines of the charging / discharging device 1 are connected to the lines of the vehicle 40 corresponding to the lines. Hereinafter, when the connector 20 and the charging port 41 are connected, the charging / discharging connector 12V line 32a and the like including the above-described lines of the vehicle 40 corresponding to the analog signal lines 32 and the CAN signal line 33, respectively, I will call it.

  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 charging / discharging device 1 side through the charging / discharging connector 12V line 32a. 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.

  What should be noted here is that the charge / discharge device 1 is further provided with a detection unit 50 and a determination unit 60 connected to the first work start / stop line 32b as shown in FIG. The detection unit 50 detects a change in potential generated in the first work start / stop line 32b before and after the connection of the connector 20 to the charging port 41. Note that the potential generated in the first work start / stop line 32b is a potential based on FG (frame ground) (ground potential). The determination unit 60 determines the connection of the connector 20 to the charging port 41 based on the detection result of the detection unit 50.

  In the preparatory work for charging the charging / discharging device 1, conventionally, when the charging / discharging device 1 first turns on the relay (d1) 101, VA ( Start potential) is supplied to the vehicle 40 side, the photocoupler (f) 202 on the vehicle 40 side is driven, and the vehicle 40 detects that the relay (d1) 101 is turned on. The first work start / stop line 32 b is connected to the FG on the vehicle 40 side through the light emitting diode of the photocoupler (f) 202. When the vehicle 40 detects that the relay (d1) 101 is turned on, the vehicle 40 transmits a signal to the charge / discharge device 1 via 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, connects the second work start / stop line 32c to the FG on the charging / discharging device 1, and drives the photocoupler (f) 202 on the vehicle 40 side. Let The vehicle 40 recognizes that the preparation of the charging / discharging device 1 is completed by driving the photocoupler (f) 202, and the charging preparation work is finished.

  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 detection unit 50, the charging / discharging device 1 can determine the connection of the connector 20 to the charging port 41 without performing CAN communication or the user operating the start button. it can.

  Hereinafter, the configuration and function of the detection unit 50 will be described. FIG. 3 is a circuit diagram illustrating a configuration of the detection unit 50. As shown in FIG. 3, the detector 50 includes a resistor 51 connected in parallel to the relay (d1) 101, a first connected in series between the first work start / stop line 32 b and the FG on the charge / discharge device 1 side. A first voltage dividing resistor 52, a second voltage dividing resistor 53, and a switching element 54 (potential fluctuation detecting unit) are included.

  Before the connector 20 of the charging / discharging device 1 is connected to the charging port 41 of the vehicle 40, charging / discharging from VA (charging / discharging device 12V) via the resistor 51 even when the relay (d1) 101 is off. A route to the FG on the apparatus 1 side is formed. Specifically, VA → first work start / stop line 32b → resistance 51 → first work start / stop line 32b → first voltage dividing resistor 52 → second voltage dividing resistor 53 → path connecting the FG on the charge / discharge device 1 side It is. By forming this route (hereinafter, referred to as “first route”), a portion of the first work start / stop line 32b on the vehicle 40 side of the relay (d1) 101 (“site X” in FIGS. 2 and 3). An electric potential (hereinafter referred to as “part potential”) is generated. The site potential is a potential based on FG.

  Before the connection between the connector 20 and the charging port 41, a current flows from the VA toward the FG on the charging / discharging device 1 side through the first path. When this current flows through the first voltage dividing resistor 52 and the second voltage dividing resistor 53, a voltage drop occurs between both ends of the first voltage dividing resistor 52 and the second voltage dividing resistor 53. The site potential is a value obtained by adding the voltage drops generated between both ends of the first voltage dividing resistor 52 and the second voltage dividing resistor 53 when FG is used as a reference.

  The switching element 54 is composed of a bipolar transistor. The switching element 54 is turned on / off according to the potential applied to the base. A connection point between the first voltage dividing resistor 52 and the second voltage dividing resistor 53 is connected to the base of the switching element 54, and is generated between both ends of the second voltage dividing resistor 53 with reference to FG. A potential corresponding to a voltage drop is applied. Depending on the application of this potential, the switching element 54 does not turn on and remains off.

  On the other hand, when the connector 20 of the charging / discharging device 1 is connected to the charging port 41 of the vehicle 40, a new route branched from the first route described above, that is, a route from the part X to the FG on the vehicle 40 side is also provided. It is formed. Specifically, it is a path connecting the part X → the first work start / stop line 32b → the light emitting diode of the photocoupler (f) 202 → the FG on the vehicle 40 side. The formation of this new path (hereinafter referred to as “second path”) causes the site potential to fluctuate. This will be specifically described below.

  After the connection between the connector 20 and the charging port 41, a current flows from the portion X toward the FG on the vehicle 40 side even through the second path, so that the first voltage dividing resistor 52 and the second voltage dividing resistor 53 are connected. The current flowing into the fluctuates. As a result, the voltage drop generated across the second voltage dividing resistor 53 also fluctuates, and the switching element 54 is turned on. When the switching element 54 is turned on, one terminal of the switching element 54 is electrically connected to the FG connected to the other terminal.

  The determination unit 60 is connected to the one terminal of the switching element 54, and recognizes an OFF / ON change of the switching element 54 as a determination signal s. And if the determination part 60 recognizes that the switching element 54 switched from OFF to ON, it will determine with the connector 20 of the charging / discharging apparatus 1 having been connected to the charging port 41 of the vehicle 40. FIG.

  Here, since the resistance value of the resistor 51 is set high, a potential is generated in the first work start / stop line 32b, but the current is limited, so the photocoupler (f) 202 is not driven.

  The resistance value of the resistor 51 may be set as follows. Originally, when relay (d1) 101 is turned on, VA → first work start / stop line 32b → relay (d1) 101 → first work start / stop line 32b → light emitting diode of photocoupler (f) 202 → vehicle 40 side A route connecting the FGs is formed. By forming this path, a current flows through the light emitting diode of the photocoupler (f) 202. The light emitting diode converts the current into light, and the photocoupler (f) 202 is driven by the phototransistor of the photocoupler (f) 202 receiving the light.

  If the resistance value of the resistor 51 is low and a current similar to that when the relay (d1) 101 is turned on flows through the resistor 51, the photocoupler (f) 202 is driven, and charging is erroneously started. There is also a risk.

  The value of the current flowing through the light emitting diode of the photocoupler (f) 202 depends on the resistance value of the resistor 51. Therefore, the photocoupler (f) 202 is not driven, that is, the photocoupler (f) 202 has a light intensity such that the light intensity of the light-emitting diode does not turn on the phototransistor of the photocoupler (f) 202. (F) What is necessary is just to set the electric current value of the electric current which flows into the light emitting diode of 202. FIG.

  For this reason, basically, the resistance value of the resistor 51 may be set higher. This is because the higher the resistance value of the resistor 51, the smaller the current value of the current flowing through the light emitting diode of the photocoupler (f) 202.

  When the determination unit 60 determines that the connector 20 of the charging / discharging device 1 is connected to the charging port 41 of the vehicle 40 and then locks the connector, the determination signal s until the connector lock is released thereafter. 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 recognition. 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 erroneous recognition of the determination signal s occurs, erroneous determination by the determination unit 60 is not caused.

  It should be noted that when the relay (d1) 101 is a semiconductor switching element, it may not be necessary to provide the resistor 51. This is because in the case of a semiconductor switching element such as an FET, a potential may be generated in the first work start / stop line 32b due to a leakage current at the time of OFF.

  FIG. 4 is a circuit diagram illustrating a modification of the detection unit 50. As shown in FIG. 4, the detection unit 50 a is different from the detection unit 50 in that a d1 ′ relay 55 (secondary relay) connected in series to a resistor 51 is provided.

  In the detection unit 50a, when the d1 'relay 55 is turned on, the first path and the second path are formed via the d1' relay 55 and the resistor 51, and the above-described part potential is changed.

  Here, after the connector is locked or after the CAN communication is established, as described above, the determination unit 60 determines that the connector 20 of the charging / discharging device 1 is the vehicle regardless of whether or not the determination signal s is recognized until the connector lock is released. It is determined that the battery is connected to 40 charging ports 41. For this reason, the detection unit 50a stops the formation of the first path and the second path by turning off the d1 'relay 55. By stopping the driving of the switching element 54, unnecessary power consumption can be prevented.

  Further, the d1 ′ relay 55 may be turned on before the charge preparation work after the charge / discharge device 1 is operated, and turned off after the determination signal s is recognized. The d1 'relay 55 may be periodically turned on / off and turned off after the determination signal s is recognized. In this way, unnecessary power consumption can be prevented. Further, even after the determination signal s has been recognized once, the d1 'relay 55 may be turned on again to make a plurality of determinations in order to prevent erroneous determination. In these cases, the voltage value of VA may be lowered in advance. By so doing, unnecessary driving of the photocoupler (f) 202 can be further suppressed. Furthermore, unnecessary driving of the photocoupler (f) 202 can also be suppressed by shortening the ON period of the d1 ′ relay 55.

  In the detection unit 50a, a transistor may be used instead of the d1 'relay 55. Since the current flowing through the resistor 51 is a very small current, using a transistor makes it possible to turn on / off more reliably than when a relay is used.

  In the interface configuration shown in FIG. 2, the detection unit 50 is connected to the first work start / stop line 32b to detect a change in potential of the first work start / stop line 32b. As shown in FIG. 5, for example, the first voltage dividing resistor 52, the second voltage dividing resistor 53, and the switching element 54 of the detection unit 50 are connected to the second work start / stop line 32c, and the second work start / stop line 32c is connected. You may detect the fluctuation | variation of the electric potential of the site | part ("site Y" in FIG. 5) of the relay (d2) 102 at the vehicle 40 side.

  By connecting the connector 20 to the charging port 41, a new path branched from the first path described above, that is, a path from the portion X shown in FIG. 2 to the FG on the charge / discharge device 1 side is also formed. Specifically, the part X → the first work start / stop line 32b → the light emitting diode of the photocoupler (g) 203 → the second work start / stop line 32c → the part Y → the first voltage dividing resistor 52 → the second voltage dividing resistor 53. → A path connecting the FGs on the charge / discharge device 1 side is formed, and a potential (feedback potential) corresponding to VA supplied from the charge / discharge device 1 to the vehicle 40 is supplied to the charge / discharge device 1 again. Since current flows from the part X toward the FG on the charge / discharge device 1 side through this path, current flows into the first voltage dividing resistor 52 and the second voltage dividing resistor 53. As a result, a voltage drop is generated between both ends of the second voltage dividing resistor 53, and the switching element 54 is turned on. When switching element 54 is turned on, determination unit 60 determines that connector 20 of charging / discharging device 1 is connected to charging port 41 of vehicle 40.

  In addition, the detection of the fluctuation of the potential generated in the first work start / stop line 32b may be performed by using a comparator or a high CTR photocoupler instead of the detection unit 50 described above, or by using the CPU to set the voltage value after A / D conversion. It may be measured.

  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.

  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.

  DESCRIPTION OF SYMBOLS 1 Charging / discharging apparatus, 10 Charging / discharging apparatus main body, 20 Connector, 30 Cable, 31 Power line, 31a Positive potential side line, 31b Negative potential side line, 32 Analog line, 32a Charging / discharging connector 12V line, 32b First work start stop Line (signal line, first signal line), 32c second work start / stop line (second signal line), 32d charge / discharge connector connection confirmation line, 32e operation permission prohibition line, 32f ground line, 33 CAN signal line, 40 vehicle , 41 Charging port, 50, 50a detector, 51 resistor, 52 first voltage divider resistor, 53 second voltage divider resistor, 54 switching element (potential fluctuation detector), 55 d1 ′ relay (secondary relay), 60 determiner , 101 relay (d1) (main relay, first main relay), 102 relay (d2) (second main relay), 103 photocoupler (j), 201 cars Contactors, 202 photocoupler (f), 203 photocoupler (g), 204 photocoupler (h), 205 photocoupler (k), 104,206 CAN circuit, 207 resistor (R4), 300 optional function configuration

Claims (7)

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,
By connecting the connector to the charging port, a path leading to the ground potential on the vehicle side is configured, and a signal line for transmitting a start potential indicating the start of a charge / discharge preparation operation to the vehicle,
A main relay disposed on the signal line and turned on to transmit the start potential;
A resistor connected in parallel to the main relay;
A charge / discharge device comprising: a potential fluctuation detection unit that detects a potential fluctuation of a portion of the signal line closer to the connector than the main relay.   The charging / discharging device according to claim 1, further comprising a slave relay connected in series with the resistor.   The current value of the current flowing through the resistor is smaller than a current value necessary for driving a photocoupler provided in the vehicle, which is driven when the main relay is turned on. Or the charging / discharging apparatus of 2.   The charging / discharging device according to claim 1, wherein the potential fluctuation detection unit is a switching element that performs a switching operation according to the potential fluctuation.   The charge / discharge device according to claim 4, wherein the switching element is a transistor that performs a gate operation with a potential closer to the connector than the main relay in the signal line.   After the connector is locked to the charging port or after the 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 potential fluctuation detection unit. The charging / discharging device according to claim 1, further comprising a determination unit that determines that the operation has been performed. 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,
By connecting the connector to the charging port, a path leading to the ground potential on the vehicle side is formed, and a first signal line for transmitting a start potential indicating the start of a charge / discharge preparation operation to the vehicle; ,
By connecting the connector to the charging port, a second signal line to which a feedback potential according to a start potential transmitted to the vehicle side by the first signal line is transmitted;
A first main relay disposed on the first signal line and turned on to transmit the start potential;
A resistor connected in parallel to the first main relay;
A second main relay disposed on the second signal line;
A charge / discharge device comprising: a potential fluctuation detection unit that detects a potential fluctuation of a portion of the second signal line closer to the connector than the second main relay.

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