JP6672864B2 - Sending circuit and charge / discharge device - Google Patents

Description

  The present invention relates to a transmission circuit for transmitting a signal current of a predetermined signal from a transmission unit to an external device connected to a predetermined signal via a connector, and a charge / discharge device including the transmission circuit.

  In recent years, environmentally friendly fuel-efficient vehicles such as HV (Hybrid Vehicle; Hybrid Vehicle), PHV (Plug-in Hybrid Vehicle), EV (Electric Vehicle; Electric Vehicle), FCV (Fuel Cell Vehicle), etc. Vehicles equipped with storage batteries or fuel cells are rapidly spreading. In PHVs and EVs having a charging interface, a storage battery is charged from a charging device outside the vehicle via a charging cable.

  In Japan, there is a CHAdeMO standard formulated by the CHAdeMO Council in Japan as a standard for a quick charging device that charges a vehicle with a DC voltage. Among the quick charging devices, those having a bidirectional voltage converter are configured to convert a DC voltage from a storage battery into an AC voltage and supply the AC voltage to a load of a power system. In Japan, a so-called V2H (Vehicle to Home) has been formulated as a guideline for electric vehicle charging and discharging systems.

  When V2H is performed, it is necessary to use a relay and / or a circuit breaker to prevent the voltage from the vehicle from flowing back to the power system. In order to ensure this, a power failure occurs. Until the voltage from V1H to V2H is supplied, the supply of the voltage to the important load may be interrupted.

  On the other hand, Patent Literature 1 includes a relay circuit that switches a source of AC power to a group of emergency uninterruptible load electric appliances to either commercial power or power from a vehicle. There is described a power failure power supply device that reliably prevents reverse power flow by switching the relay circuit to the vehicle side when the power failure is detected. In this apparatus, a UPS (Uninterruptible Power Supply) is connected between the relay circuit and the emergency uninterruptible load electrical equipment group, and from when a power failure occurs until power supply by V2H is started. During this period, power is supplied from the UPS to the emergency uninterruptible load electrical equipment group.

  On the other hand, when V2H is performed via a rapid charging device capable of controlling charging / discharging, it is necessary to supply power to a charging / discharging control unit included in the rapid charging device at the time of a power failure, and the quick charging device An auxiliary power supply such as a battery may be provided. For example, in Patent Literature 2, when a commercial power system loses power, the power of the battery unit is supplied to the control unit, and the control unit disconnects the home power system from the commercial power system using the supplied power. Later, a power supply switching device that converts DC power stored in a main battery of an electric vehicle into AC power and supplies the AC power to a house load is described.

  Generally, when connecting a rapid charging device and a vehicle with a charge / discharge cable to charge / discharge a storage battery of the vehicle or discharge a fuel cell of the vehicle, a plurality of current signals are transmitted via the charge / discharge cable. Sent and received. When a current signal is not transmitted due to a contact failure of a connector for connecting the charging / discharging cable or the like, there is no particular problem simply because charging / discharging is not started. On the other hand, when the ground potentials (FG) are not normally connected between the quick charging device and the vehicle via the terminal of the connector included in the return current path of the current signal, the current signals or the auxiliary equipment on the vehicle side are not connected. In some cases, current wraparound occurs between the battery and the current signal, and the current signal is erroneously recognized as ON.

JP 2006-158084 A JP 2013-247841 A

  However, Patent Document 1 does not show that any signal is transmitted and received in a state where the cable from the hybrid vehicle is connected to the outlet of the changeover switch. Further, in the power supply switching device described in Patent Literature 2, a circuit for transmitting and receiving a current signal is not disclosed, and when a charging cable is actually connected to a vehicle, a current sneak occurs in a signal line to generate a current signal. May be erroneously transmitted.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a transmission circuit and a transmission circuit capable of preventing current from flowing around a circuit for transmitting a current signal. The present invention is to provide a charging / discharging device provided with the same.

A transmission circuit according to one embodiment of the present invention is a transmission circuit including: a connector for transmitting and receiving a predetermined signal to and from an external device; and a transmission unit that transmits a signal current of the predetermined signal to the external device. connector, said has a terminal included in the path of the return current of a predetermined signal, comprises between the input and output is galvanically isolated DC / DC converter, another external DC power supply having one end to the terminal is connected A voltage is applied to the DC / DC converter from an end, and an output voltage of the DC / DC converter is supplied to the transmission unit.

  A transmission circuit according to one embodiment of the present invention includes a second connector for connecting to the DC power supply.

  A transmission circuit according to an aspect of the present invention includes a normally open first switch interposed in an electric circuit for connecting the DC / DC converter to the DC power supply, and is connected between both ends of the first switch. And a second switch of a normally open type and a momentary type, wherein the first switch is turned on by a voltage related to an output voltage of the DC / DC converter.

  A transmission circuit according to one embodiment of the present invention includes a second DC power supply connected to an electric circuit for connecting the DC / DC converter to the DC power supply.

  The sending circuit according to one aspect of the present invention includes a first diode having a cathode disposed toward the connection point at a position closer to the DC power supply than a connection point with the second DC power supply in the electric circuit. It is characterized by having.

  A transmission circuit according to one embodiment of the present invention includes a normally closed third switch provided between the connection point and a second DC power supply, and the third switch is turned off by a voltage from the DC power supply. It is characterized by doing so.

  In a transmission circuit according to one embodiment of the present invention, the third switch has a terminal for controlling on / off, and a normally-closed type connecting the terminal to an anode side position of the first diode in the electric circuit. Wherein the fourth switch is turned off by a voltage from the power system.

  A transmission circuit according to an aspect of the present invention includes a second diode connected between both ends of the third switch, with a cathode connected to the second DC power supply.

  A transmission circuit according to an aspect of the present invention switches between both ends of the DC power supply and the second DC power supply at a connection point of the electric circuit with the second DC power supply, and connects to the DC / DC converter. A fifth switch having two circuits and two contacts is provided.

  A transmission circuit according to one embodiment of the present invention is a circuit that switches between the DC power supply and the second DC power supply at a connection point of the electric circuit with the second DC power supply and connects to the DC / DC converter. A sixth switch having two contacts is provided.

  In the transmission circuit according to one embodiment of the present invention, the connector and the predetermined signal are based on the CHAdeMO standard standardized by the CHAdeMO Council or the charging / discharging system guidelines for electric vehicles standardized by the Electric Vehicle Power Supply System Council. It is characterized by having.

  A charging / discharging device according to one embodiment of the present invention includes the above-described transmission circuit, a control unit that causes the transmission circuit to transmit the signal current, and a conversion unit that bidirectionally converts a DC voltage and an AC voltage. The storage device of the external device is charged and discharged (or the fuel cell is discharged) by using a conversion unit.

According to this aspect, when the sending unit sends the signal current of the predetermined signal to the external device via the connector, a specific terminal of the connector is included in the return current path, and the same terminal is used as the return terminal. A voltage is input from an external DC power supply included in the current path to a DC / DC converter in which input and output are insulated from each other in a DC manner, and an output voltage of the DC / DC converter is supplied to a transmission unit to supply power to the transmission unit. Voltage.
Accordingly, when the reference potentials to be connected to the external device are not connected to each other via the terminal of the connector, the DC / DC converter, the transmitting unit, and the signal terminal of the connector are connected from the external DC power supply. As a result, the return current of the external DC power supply does not flow around, so that the predetermined signal is not transmitted as being turned on.

  In this aspect, the terminal connected to the DC power supply among the terminals of the external device-side connector fitted with the connector to receive the voltage from the external DC power supply via the second connector. Is not supplied, the voltage from the DC power supply is supplied to the transmission unit.

In this embodiment, a parallel circuit of a normally open first switch and a normally open momentary second switch is interposed in an electric circuit for connecting the DC / DC converter to an external DC power supply. The first switch is turned on by a voltage related to an output voltage of a DC / DC converter that operates with a voltage from an external DC power supply.
Thereby, when the DC / DC converter is not operated, the external DC power supply is disconnected. Further, for example, when the user pushes the second switch, the voltage from the external DC power supply is input to the DC / DC converter, and the voltage output from the DC / DC converter or the voltage generated based on the voltage is the first voltage. Since the first switch is turned on by being applied to the switch, the voltage from the external DC power supply continues to be input to the DC / DC converter even after the second switch is opened.

  In this aspect, an external DC power supply and a second DC power supply included in the transmission circuit are connected in parallel, and a voltage is input from at least one of the power supplies to the DC / DC converter.

  In this aspect, since the first diode is interposed to prevent a current flowing into the external DC power supply from a connection point where the external DC power supply and the second DC power supply are connected in parallel, For example, when a DC / DC converter is bidirectionally charged to charge a battery as a second DC power supply, charging of the battery as an external DC power supply is prevented.

In this embodiment, a normally closed type that is turned off by a voltage from the external DC power supply between a connection point where the external DC power supply and the second DC power supply are connected in parallel and the second DC power supply The third switch is interposed.
Thus, when an external DC power supply is connected, the third switch is turned off and the second DC power supply is disconnected from the DC / DC converter, so that, for example, the battery as the second DC power supply is prevented from charging and discharging. You.

In this embodiment, a voltage from an external DC power supply is applied to a terminal for controlling the third switch to be on / off via a normally closed fourth switch that is turned off when a voltage from the power system is applied. Applied.
As a result, when the power system is not interrupted, the fourth switch is turned off, and no current flows into the terminal for controlling the third switch to be turned on and off. For example, a battery serving as an external DC power supply is discharged. Is prevented.

In this embodiment, when the third switch is off, that is, when an external DC power supply is connected, both ends of the third switch are connected to input a voltage from the second DC power supply to the DC / DC converter. The second diode is connected between them.
Thereby, while receiving the voltage from the external DC power supply, the voltage is input to the DC / DC converter from at least one of the external DC power supply and the second DC power supply.

  In this embodiment, since the external DC power supply and the second DC power supply are switched by the two-circuit two-contact double-sided switch and connected to the DC / DC converter, the external DC power supply and the second DC power supply are connected. No interference occurs.

  In this embodiment, since the external DC power supply and the second DC power supply are switched by the one-circuit two-contact one-piece switch and connected to the DC / DC converter, the external DC power supply and the second DC power supply are connected. No interference occurs.

In this aspect, the connector for connecting to the external device and the predetermined signal transmitted through the connector are compliant with the CHAdeMO standard or the charging / discharging system guidelines for electric vehicles.
Thereby, when a current signal conforming to the CHAdeMO standard or the charging / discharging system guideline for an electric vehicle is transmitted from the transmission unit and the external storage battery is charged / discharged, the current is prevented from flowing to the transmission unit and safety is improved. Secured.

In this aspect, the control unit controls the sending circuit to send out the signal current, and the conversion unit converts the DC voltage and the AC voltage in both directions to charge and discharge the storage battery of the external device, Or discharge.
This makes it possible to safely perform charging / discharging by applying a sending circuit capable of preventing current from flowing around the circuit that sends the current signal to the charging / discharging device.

According to the above, when the reference potentials to be connected to the external device are not connected to each other via the terminal of the connector, the DC / DC converter, the transmitting unit, and the signal terminal of the connector are connected from the external DC power supply. Since the return current of the external DC power supply does not sneak through, the predetermined signal is not transmitted as being turned on.
Therefore, it is possible to prevent the current from flowing around the circuit that sends out the current signal.

FIG. 2 is a block diagram showing a main configuration of the charge / discharge device according to Embodiment 1 of the present invention. FIG. 2 is a circuit diagram showing a configuration of a coupling circuit in the charge / discharge device according to Embodiment 1 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 2 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 2 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 2 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 3 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 3 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 4 of the present invention. FIG. 9 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 4 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 5 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 5 of the present invention. FIG. 13 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 6 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 7 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 7 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 8 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 8 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 9 of the present invention. FIG. 15 is a circuit diagram showing a configuration of a coupling circuit in a charge / discharge device according to Embodiment 9 of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.
(Embodiment 1)
FIG. 1 is a block diagram showing a main configuration of the charge / discharge device according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes a charging / discharging device for performing charging in accordance with the CHAdeMO standard by the CHAdeMO Council and charging / discharging in accordance with the charging / discharging system guidelines for electric vehicles by the Electric Vehicle Power Supply System Council. In the charging / discharging device 1, a charging / discharging connector (corresponding to a connector) 50 attached to one end of a charging / discharging cable 5 extending from a main body indicated by a solid frame is disposed in a vehicle (corresponding to an external device) 9. Removably fitted to the inlet 60. In the charge / discharge device 1, a cigar plug (corresponding to a second connector) 70 attached to one end of a cigar socket connection cable 7 extending from the main body is detachably attached to a cigar socket 80 provided in the vehicle 9. Fits.

  The charging / discharging device 1 includes an insulating transformer 13 in which one terminal pair is connected to a distribution board 201 of a power system 200 via a relay contact of a breaker 11 and a disconnection relay 12, and another terminal pair of the insulating transformer 13. A bidirectional inverter (corresponding to a converter) 14 to which an input / output terminal pair on the AC side is connected, an inrush current prevention circuit 15 in which one terminal pair is connected to the DC side input / output terminal pair of the bidirectional inverter 14, A charge / discharge control unit (corresponding to a control unit) 10 for controlling voltage conversion by the bidirectional inverter 14. The bidirectional inverter 14 bidirectionally converts a DC voltage and an AC voltage. The charge / discharge control unit 10 communicates with an operation display unit 101 having buttons, a touch panel, and an LCD for receiving an operation by a user, and a CAN communication unit 902 connected to a power storage control unit 90 for controlling the operation of the entire vehicle 9. Connected to the CAN communication unit 102.

  The charge / discharge device 1 also includes an insulating control power supply (including a DC power supply corresponding to a DC / DC converter) 2 in which an AC-side input terminal pair is connected to the distribution board 201 via the breaker 17, The power supply 2 includes a coupling circuit 3 in which an output terminal is connected to an input terminal on the DC side of the power supply 2 and a built-in battery (corresponding to a second DC power supply) 21. In the first embodiment, the built-in battery 21 is not used. The charging / discharging device 1 further includes a relay d1 in which one end of a normally-open relay contact is connected to a 12V power supply output from the control power source 2, and a relay d2 in which one end of a normally-open relay contact is connected to FG. , A resistor R1 having one end connected to FG (Frame Ground: ground potential), and a photocoupler j. The control power supply 2 is DC-insulated between a DC-side input terminal and a power supply of at least 12V. The control power supply 2 shown in FIG. 1 is representative of control power supplies 2a and 2b described later, and the coupling circuit 3 is represented as representative of coupling circuits 3a, 3b, 3c,.

  Note that at least the relay contact of the relay d1 and the photodiode of the photocoupler j correspond to a transmitting unit, and the transmitting unit, the control power supply 2, the coupling circuit 3, the built-in battery 21, the charge / discharge connector 50, and the cigar plug 70 are included in the transmitting circuit. Equivalent to. A 12V power output from the control power supply 2 is supplied to the transmission unit. The circuit power of, for example, 5 V output from the control power supply 2 is supplied to each circuit such as the charge / discharge control unit 10, the operation display unit 101, the CAN communication unit 102, and the bidirectional inverter 14.

  The relay coil for turning on the parallel-off relay 12 and the relay coil for turning on each of the relays d1 and d2 are connected to a drive circuit (not shown) in the charge / discharge control unit 10. Each of the anode and cathode of the photodiode included in the photocoupler j is connected to a 12 V power supply and one end of a resistor R2. Each of the emitter and the collector of the transistor included in the photocoupler j is connected to a signal input circuit (not shown) in the FG and the charge / discharge control unit 10. With this configuration, the ON signal of the photocoupler j is taken into the charge / discharge control unit 10.

  The charge / discharge connector 50 includes voltage terminals 51 and 52 respectively connected to other terminal pairs of the inrush current prevention circuit 15, a voltage terminal 53 connected to one input terminal of the coupling circuit 3, and relays d1 and d2. The signal terminals 54 and 55 connected to the other ends of the respective relay contacts, the signal terminals 56 and 57 connected to the other ends of the resistors R1 and R2, and the ground wire 581 included in the charging / discharging cable 5 are connected to each other. An FG terminal 58 connected to the FG via the FG terminal and a communication terminal 59 connected to the CAN communication unit 102 are provided. The communication terminal 59 is actually composed of two terminals, but is shown here as one terminal for explanation.

  Inlet 60 includes voltage terminals 61, 62, 63 corresponding to voltage terminals 51, 52, 53, signal terminals 64, 65, 66, 67 corresponding to signal terminals 54, 55, 56, 57, respectively, and FG terminal. An FG terminal 68 corresponding to 58 and a communication terminal 69 corresponding to the communication terminal 59 are provided. The respective terminals of the charge / discharge connector 50 and the inlet 60 are configured such that when the charge / discharge connector 50 is fitted to the inlet 60, the corresponding terminals are connected to each other.

  The cigar plug 70 has a voltage terminal 71 connected to one input terminal of the coupling circuit 3 via a voltage line included in the cigar socket connection cable 7. The cigar socket 80 has a voltage terminal 81 corresponding to the voltage terminal 71. The voltage terminals 71 and 81 of the cigar plug 70 and the cigar socket 80, respectively, are connected when the cigar plug 70 is fitted to the cigar socket 80.

  The voltage terminals 61 and 62 are separately connected to both ends of a main battery (corresponding to a storage battery or a fuel cell) 92 of the vehicle 9 via normally open relay contacts of a two-circuit relay (contactor) 91. . Voltage terminals 63 and 81 are connected to an auxiliary battery (corresponding to an external DC power supply) 94 of vehicle 9. Since the voltage terminal 63 may not be connected to the auxiliary battery 94, this connection is indicated by a broken line. The signal terminal 64 is connected to one end of a normally open relay contact of the relay 93 via a relay coil that turns on the relay 91. The signal terminal 65 is connected to the other end of the relay contact of the relay 93. The relay coil that turns on the relay 93 is connected to a drive circuit (not shown) in the power storage control unit 90.

  The signal terminals 64 and 65 are separately connected to a signal input circuit (not shown) in the power storage control unit 90 together with the signal terminal 66. This signal input circuit captures signals from the signal terminals 64, 65, and 66 using a photocoupler similar to the photocoupler j. The signal terminal 67 is connected to the collector of the transistor k via the resistor R4. The emitter of the transistor k is connected to the FG and the FG terminal 68 on the vehicle 9 side. The base of the transistor k is connected to a signal output circuit (not shown) in the storage control unit 90. The communication terminal 69 is connected to the CAN communication unit 902.

  In the above configuration, when the charge / discharge connector 50 is fitted to the inlet 60 of the vehicle 9, the voltage terminals 51, 52 are connected to the voltage terminals 61, 62, respectively, and the signal terminals 54, 55, 56, 57, and the FG terminal 58 are provided. And the communication terminal 59 are connected to the signal terminals 64, 65, 66, 67, the FG terminal 68 and the communication terminal 69, respectively. That is, the charging / discharging device 1 and the vehicle 9 are connected via the charging / discharging connector 50 and the inlet 60. When the voltage terminal 63 is not connected to the auxiliary battery 94, one input terminal of the coupling circuit 3 is connected to the auxiliary battery 94 by fitting the cigar plug 70 to the cigar socket 80.

  More specifically, when the charging / discharging connector 50 of the charging / discharging cable 5 is attached to the inlet 60 so as to obtain the connection state shown in FIG. 1, the row output from the resistor R <b> 1 via the signal terminals 56 and 66. An active connection confirmation signal is input to power storage control unit 90. Then, the power storage control unit 90 detects the attachment of the charging / discharging cable 5 to the inlet 60 based on the determination result obtained by receiving the connection confirmation signal.

  On the other hand, the charging / discharging control unit 10 of the charging / discharging device 1 drives the relay coil of the relay d1 when the operation display unit 101 receives the operation of starting charging, so that the charging start signal_1 is transmitted from the relay contact of the relay d1. A signal current is delivered. Then, the power storage control unit 90 recognizes the start of the charge control based on the determination result obtained by receiving the charge start signal_1 input through the signal terminals 54 and 64.

  Thereafter, a charge control signal is transmitted and received between the charge / discharge control unit 10 and the power storage control unit 90 by CAN communication performed between the CAN communication units 102 and 902. As a result, a charge control signal including information such as the maximum voltage of the main battery 92 and the battery capacity is transmitted from the charge control unit 90 to the charge / discharge control unit 10, and the charge control unit 10 sends the charge control signal to the charge control unit 90. A charge control signal including information such as a voltage and a maximum current is transmitted.

  The suitability of charging is determined by the storage control unit 90. If it is determined that they match, the transistor k is turned on by a signal from the power storage control unit 90, and a ready completion notification signal output from the collector of the transistor k is input to the photocoupler j, and the preparation is performed from the photodiode of the photocoupler j. The signal current of the completion notification signal is transmitted. Then, the charge / discharge control unit 10 accepts the preparation completion notification signal input to the photocoupler j and, based on the determination result, confirms that the vehicle 9 is allowed to charge, and drives the relay coil of the relay d2. Thereby, the signal current of the charge start signal_2 is transmitted from the relay contact of the relay d2.

  The FG terminal 58 included in the charge / discharge connector 50 is included in the return current path of each signal (so-called return path) for the above-described connection confirmation signal, charge start signal_1, preparation completion notification signal, and charge start signal_2. ing. The current from the auxiliary battery 94 also returns to the auxiliary battery 94 via the FG terminal 58. At least the charging start signal_1 and the preparation completion notification signal correspond to the predetermined signal.

  Next, the power storage control unit 90 recognizes the start of charging and drives the relay coil of the relay 93 based on the determination result obtained by receiving the charging start signal_2 input through the signal terminals 55 and 65. As a result, the relay contact of the relay 93 is turned on, and the charging start signal_1 of approximately 12 V and the charging start signal_2 of approximately 0 V are applied to both ends of the relay coil of the relay 91. Both ends of the main battery 92 are directly connected to the voltage terminals 61 and 62.

  After that, the power storage control unit 90 determines the maximum current that can charge the main battery 92, and transmits the determined current command value to the charge / discharge control unit 10 at a fixed cycle by CAN communication. The charge / discharge control unit 10 receiving the signal controls the bidirectional inverter 14 so that the charging current according to the received current command value is supplied to the vehicle 9 via the charge / discharge cable 5.

  As described above, the control power supply 2 outputs a 12V power supply and a circuit power supply based on the AC voltage from the power system 200 in order for the charge / discharge device 1 to charge the main battery 92 of the vehicle 9 using the bidirectional inverter 14. This is an explanation of the operation when the charge / discharge control unit 10 supplies a signal to the above-described sending circuit and causes the sending circuit to send a signal. In order for the charging / discharging device 1 to use the bidirectional inverter 14 to discharge the main battery 92, the charging / discharging control unit 10 causes the sending circuit to send a signal. This is because the operation from the reception of the operation to the start of the CAN communication is the same as the above case. Omit detailed description

  When the DC voltage discharged from the main battery 92 is converted into an AC voltage by the charging / discharging device 1, the converted AC voltage is supplied to a load (not shown) accommodated in the distribution board 201. In any case where the charging / discharging device 1 charges / discharges the main battery 92, the preparation completion notification signal input to the photocoupler j is an important signal for notifying the charging / discharging preparation completion in the vehicle 9.

  By the way, when the power system 200 is out of power, the control power supply 2 detects the outage and switches the voltage supply source from the AC-side input terminal to the DC-side input terminal. In the first embodiment, a DC voltage is input from the auxiliary battery 94 of the vehicle 9 to the DC-side input terminal of the control power supply 2 via the coupling circuit 3.

  FIG. 2 is a circuit diagram showing a configuration of coupling circuit 3 in charging / discharging device 1 according to Embodiment 1 of the present invention. Here, the coupling circuit 3a is configured by one conductor connecting one input terminal and one output terminal. The built-in battery 21 is not connected to the coupling circuit 3a. When the auxiliary battery 94 is connected to the voltage terminal 63 on the vehicle 9 side, the DC voltage from the auxiliary battery 94 is input to the control power supply 2a via the voltage terminals 63 and 53 and the coupling circuit 3a. When the auxiliary battery 94 is not connected to the voltage terminal 63 on the vehicle 9 side, the cigarette plug 70 attached to one end of the cigarette socket connection cable 7 is attached to the cigarette socket 80 of the vehicle 9 so that the auxiliary machine 94 is attached. A DC voltage from the battery 94 is input to the control power supply 2a via the voltage terminals 81 and 71 and the coupling circuit 3a.

  Here, for example, the charging / discharging connector 50 is incompletely fitted to the inlet 60, or the ground wire 581 included in the charging / discharging cable 5 is disconnected, so that the FG is mutually connected between the charging / discharging device 1 and the vehicle 9. And the control power supply 2a is not insulated. In this case, the current from the auxiliary battery 94 of the vehicle 9 is supplied to the voltage terminals 63 and 53, the coupling circuit 3a, the control power supply 2a and the 12V power supply, the relay contact of the relay d1, the signal terminals 54 and 64, and the power storage control unit 90. The signal may return to the auxiliary battery 94 via the signal input circuit (not shown) and the FG, and the power storage control unit 90 erroneously recognizes that the charge start signal_1 is ON. The current from the auxiliary battery 94 is supplied to the voltage terminals 63 and 53, the coupling circuit 3a, the control power supplies 2a and 12V, the photodiode of the photocoupler j, the resistor R2, the signal terminals 57 and 67, the resistor R4, The battery may return to the auxiliary battery 94 via the transistors k and FG, and the charge / discharge control unit 10 erroneously recognizes that the preparation completion notification signal is on.

  If the charge / discharge control unit 10 erroneously recognizes that the preparation completion notification signal is ON, the charge / discharge device 1 sends the vehicle 9 to the vehicle 9 even though the vehicle 9 is not actually ready for charge / discharge. There is a possibility that a high charging voltage may be applied to the battery, which is a safety problem. Therefore, in the charging / discharging device 1 according to the first embodiment, the control power supply 2 is of an insulation type, and the DC input terminal of the control power supply 2 and the 12V power supply are DC-insulated. The control power supply 2 prevents DC current from flowing from an input terminal on the DC side to a 12V power supply.

  For this reason, the signal current path of the preparation completion notification signal is from the 12 V power supply output from the control power supply 2 to the photodiode of the photocoupler j, the resistors R2, the signal terminals 57 and 67, the resistor R4, the transistor k, and the FG terminal. The only path that returns to the control power source 2 via the ground lines 68 and 58, the ground line 581, and the FG is provided. Therefore, when the FGs are not normally connected between the charge / discharge device 1 and the vehicle 9 via the FG terminals 58 and 68, the preparation completion notification signal is not turned on, and safety is ensured.

As described above, according to the first embodiment, the charge contact signal_1 (or the preparation completion notification signal) is sent to the vehicle 9 via the charging / discharging connector 50 of the relay contact of the relay d1 (or the photodiode of the photocoupler j). When transmitting the signal current, the FG terminal 58 of the charge / discharge connector 50 is included in the return current path, and the same FG terminal 38 is input from the auxiliary battery 94 of the vehicle 9 included in the return current path. A voltage is input to the control power supply 2a whose output is insulated in a DC manner, and the 12V power output from the control power supply 2a is supplied to the relay contact of the relay d1 (or the photodiode of the photocoupler j) as a transmission unit. This is the power supply voltage of the sending unit.
Thereby, when the FGs to be connected to the vehicle 9 are not connected to each other via the FG terminal 58 of the charge / discharge connector 50, the auxiliary battery 94 supplies the control power source 2a and the relay contact of the relay d1 (or the photo relay). Since the return current of the auxiliary battery 94 does not flow through the photodiode of the coupler j and the signal terminal 54 (or 57) of the charge / discharge connector 50, an unintended charge start signal_1 (or a preparation completion notification signal) Is not transmitted as ON.
Therefore, it is possible to prevent the current from flowing around the circuit that sends out the current signal.

  Further, according to the first embodiment, in order to receive the voltage from auxiliary battery 94 via cigar plug 70, among the terminals of inlet 60 fitted with charging / discharging connector 50, connection to auxiliary battery 94 is made. Even when the connected terminal does not exist, the voltage from the auxiliary battery 94 can be supplied to the relay contact of the relay d1 and the photodiode of the photocoupler j.

(Embodiment 2)
The first embodiment is a mode in which one input terminal and one output terminal in the coupling circuit 3a are connected by one conductor, whereas the second embodiment has one input terminal and one output terminal in the coupling circuit 3a. This is a mode in which a normally open switch is interposed in an electric circuit connecting between output terminals. The configuration of the main part of the charging / discharging device 1 in the second embodiment is the same as that shown in FIG. 1 of the first embodiment. Is omitted.

  FIGS. 3A, 3B and 3C are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 2 of the present invention. 3A, 3B, and 3C, 3b, 3c, and 3d denote coupling circuits. Each of the coupling circuits 3b, 3c, and 3d includes a relay (corresponding to a first switch) in an electric path connecting one input terminal and one output terminal. ) 31 normally open relay contacts are interposed.

  In the coupling circuit 3b, a normally open and momentary switch (corresponding to a second switch) 32 is connected between both ends of the relay contact of the relay 31. In the coupling circuits 3c and 3d, one switch included in a switch 33 linked to two circuits is connected between both ends of the relay contact of the relay 31. The switch 33 is a normally open type and a momentary type, and the other switches included in the switch 33 are connected to the control power supply 2b.

  In each of the coupling circuits 3b and 3c, a relay coil for turning on a relay contact of the relay 31 is connected to a 12V power supply output from the control power supplies 2a and 2b. In the coupling circuit 3d, the relay coil of the relay 31 is connected to a drive circuit (not shown) in the charge / discharge control unit 10. When detecting a power failure in the input terminal pair on the AC side, the control power supply 2b supplies a 12V power supply when a DC voltage is input to the input terminal on the DC side and another switch included in the switch 33 is turned on. It is designed to start to output circuit power.

  In FIG. 3A, the control power supply 2a switches the voltage supply source to the DC-side input terminal when detecting a power failure at the AC-side input terminal pair. In this case, a parallel circuit of a normally-open relay contact and a normally-open switch 32 is interposed between the DC-side input terminal and the voltage terminals 53 and 71. No voltage from the battery 94 is applied. Accordingly, the operation of the control power supply 2a is stopped, and the auxiliary battery 94 is disconnected from the control power supply 2a.

  In this state, for example, when the user operates the switch 32 to turn on the switch 32, the voltage from the auxiliary battery 94 is applied to the DC-side input terminal of the control power supply 2a, and the control power supply 2a starts operating. Thereafter, since the power supply voltage of 12V output from the control power supply 2a is applied to the relay coil of the relay 31 to turn on the relay contact, even if the operation of the switch 32 is stopped, the DC power supply of the control power supply 2a is stopped. The connection between the input terminal and the auxiliary battery 94 is maintained.

  In FIG. 3B, when the control power supply 2b detects a power failure at the AC-side input terminal pair, the control power supply 2b switches the voltage supply source to the DC-side input terminal similarly to the control power supply 2a, and discharges the auxiliary battery 94. Stop operation to prevent. Auxiliary battery 94 is disconnected from control power supply 2b.

  In this state, for example, when the user operates the two-circuit-linked switch 33 to turn it on, the voltage from the auxiliary battery 94 is applied to the DC-side input terminal of the control power supply 2b by one of the switches included in the switch 33. Applied. At the same time, the other switches included in the switch 33 are turned on, so that the control power supply 2b starts operating. Thereafter, a voltage is applied to the relay coil of the relay 31 from the 12V power supply generated by the control power supply 2b to turn on the relay contact. Therefore, even when the operation of the switch 32 is stopped, the DC power supply of the control power supply 2b is Of the auxiliary battery 94 is maintained.

  In FIG. 3C, the states of the control power supply 2b and the coupling circuit 3d from before the switch 33 is operated until immediately before the control power supply 2b starts operating by operating the switch 33 are the control power supply 2b shown in FIG. 3B. This is the same as the case of the coupling circuit 3c. When the switch 33 is operated and the control power supply 2b starts operating, the 5V circuit power generated by the control power supply 2b is supplied to the charge / discharge control unit 10, and the charge / discharge control unit 10 starts operating. Thereafter, a drive voltage (corresponding to a voltage related to the output voltage of the DC / DC converter) is applied to a relay coil of the relay 31 from a drive circuit (not shown) in the charge / discharge control unit 10 to turn on the relay contact. , The connection between the DC input terminal of the control power supply 2b and the auxiliary battery 94 is maintained.

  Here, when the discharge of the main battery 92 is started and the AC voltage converted by the bidirectional inverter 14 is applied to the input terminal pair on the AC side of the control power supply 2b, the control power supply 2b switches the voltage supply source to the AC power supply. Switch to the input terminal pair on the side. In this case, since the 12 V power supply from control power supply 2b is maintained, relay 31 continues to be turned on, but no current flows from auxiliary battery 94 to control power supply 2b. The charge / discharge control unit 10 can turn off the drive voltage to the relay coil of the relay 31 to turn off the relay contact. In this case, when the discharge of the main battery 92 is stopped, no AC voltage is input to the pair of input terminals on the AC side of the control power supply 2b, and the state returns to the state before the switch 33 was operated.

As described above, according to the second embodiment, the electric circuit for connecting the control power supply 2a (or 2b) to the auxiliary battery 94, that is, the input terminal on the DC side of the control power supply 2a (or 2b) and the voltage terminal 53 Or a parallel circuit of a normally open type relay contact of the relay 31 and a normally open type momentary type switch 32 (or 33) on the electric path between the auxiliary battery 94 and the voltage from the auxiliary battery 94. The relay contact of the relay 31 is turned on by the 12V power supply voltage output from the control power supply 2a (or the 12V power supply voltage output from the control power supply 2b or the drive voltage from the charge / discharge control unit 10).
Therefore, when the control power supply 2a (or 2b) is not operated, the auxiliary battery 94 can be disconnected. Further, for example, when the user pushes the switch 32 (or 33), the voltage from the auxiliary battery 94 is input to the control power supply 2a (or 2b), and the voltage output from the control power supply 2a (or the control power supply 2b is output). Voltage or the voltage from the charge / discharge control unit 10 operated by the circuit power supply from the control power supply 2b) is applied to the relay coil of the relay 31 to turn on the relay contact, so that after the switch 32 (or 33) is opened. It is also possible to continuously input the voltage from the auxiliary battery 94 to the control power supply 2a (or 2b).

(Embodiment 3)
Embodiments 1 and 2 do not use the built-in battery 21, whereas Embodiment 3 is a form in which the auxiliary battery 94 and the built-in battery 21 are connected in parallel. The main configuration of the charging / discharging device 1 according to the third embodiment is the same as that shown in FIG. 1 of the first embodiment. Is omitted.

  4A and 4B are circuit diagrams illustrating a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 3 of the present invention. 4A and 4B, reference numerals 3e and 3f denote coupling circuits. The coupling circuits 3e and 3f have other input terminals connected to the built-in battery 21.

  In the coupling circuits 3e and 3f, a point P on an electric circuit connecting one input terminal and an output terminal is directly connected to another input terminal. That is, the point P is a connection point where the auxiliary battery 94 and the built-in battery 21 are connected in parallel. In the coupling circuit 3f, a diode (corresponding to a first diode) 34 is connected between the point P and one input terminal with the cathode facing the point P.

  4A and 4B, auxiliary battery 94 and built-in battery 21 are connected in parallel or in parallel at point P, and a voltage is input to control power supply 2a from at least one of the batteries. In FIG. 4B, control power supply 2a functions as a charger for charging built-in battery 21 when power system 200 is not out of power (the same applies to later-described fifth to ninth embodiments). In this case, diode 34 prevents the charging current from flowing into auxiliary battery 94.

  As described above, according to the third embodiment, since auxiliary battery 94 included in vehicle 9 and built-in battery 21 included in the sending circuit are connected in parallel, voltage is applied from at least one battery to control power supply 2a. Can be entered.

  According to the third embodiment, since diode 34 is interposed to prevent a current flowing into auxiliary battery 94 from point P where auxiliary battery 94 and internal battery 21 are connected in parallel, For example, when the built-in battery 21 is charged by the control power supply 2a, the charging of the auxiliary battery 94 can be prevented.

(Embodiment 4)
Embodiment 2 is a mode in which the built-in battery 21 is not used, whereas Embodiment 4 is a mode in which the auxiliary battery 94 and the built-in battery 21 are connected in parallel. The main configuration of the charge / discharge device 1 in the fourth embodiment is the same as that shown in FIG. 1 of the first embodiment, and the same reference numerals are given to portions corresponding to the first and second embodiments. The description is omitted.

  5A and 5B are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 4 of the present invention. In FIGS. 5A and 5B, reference numerals 3g and 3h denote coupling circuits. The coupling circuits 3g and 3h have other input terminals connected to the built-in battery 21.

  The coupling circuit 3g is different from the coupling circuit 3b of the second embodiment shown in FIG. 3A in that one end of a parallel circuit of the relay contact of the relay 31 and the switch 32 is connected to one input terminal via diodes 34 and 35, respectively. The difference is that it is connected to another input terminal. The coupling circuit 3h is different from the coupling circuit 3c (or 3d) shown in FIG. 3B (or 3C) in that one end of a parallel circuit of a relay contact of the relay 31 and one switch included in the switch 33 is connected via a diode 34. In that the diode 35 is connected to the output terminal and a diode 35 is interposed between the output terminal and another input terminal. The diodes 34 and 35 are connected with their cathodes facing a point P where the auxiliary battery 94 and the built-in battery 21 are connected in parallel. The diodes 34 and 35 prevent current from flowing into the auxiliary battery 94 and the built-in battery 21, respectively, and one or both of them may be replaced with a conductor.

  In FIG. 5A, the control power supply 2a switches the voltage supply source to the DC-side input terminal when detecting a power failure at the AC-side input terminal pair. In this case, since a parallel circuit of a normally open relay contact and a normally open switch 32 is interposed between the DC side input terminal and the point P, the auxiliary battery 94 or the The voltage from the built-in battery 21 is not applied. Accordingly, the operation of the control power supply 2a is stopped, and the auxiliary battery 94 is disconnected from the control power supply 2a.

  In this state, for example, when the user operates the switch 32 to turn on the switch 32, the voltage from the auxiliary battery 94 or the built-in battery 21 is applied to the DC input terminal of the control power supply 2a, and the control power supply 2a operates. Start. Thereafter, since the power supply voltage of 12V generated by the control power supply 2a is applied to the relay coil of the relay 31 to turn on the relay contact, even when the operation of the switch 32 is stopped, the DC power supply of the control power supply 2a is stopped. The connection between the input terminal and the auxiliary battery 94 or the built-in battery 21 is maintained.

  In FIG. 5B, when the control power supply 2b detects a power failure at the AC-side input terminal pair, the control power supply 2b switches the voltage supply source to the DC-side input terminal similarly to the control power supply 2a, and the auxiliary battery 94 and the built-in power supply. The operation is stopped to prevent the battery 21 from discharging. Auxiliary battery 94 is disconnected from control power supply 2b.

  In this state, for example, when the user operates the two-circuit-linked switch 33 to turn it on, the voltage from the auxiliary battery 94 is applied to the DC-side input terminal of the control power supply 2b by one of the switches included in the switch 33. Applied. At the same time, the other switches included in the switch 33 are turned on, so that the control power supply 2b starts operating. Thereafter, a voltage is applied to the relay coil of the relay 31 from the 12V power supply generated by the control power supply 2b to turn on the relay contact. Therefore, even when the operation of the switch 32 is stopped, the DC power supply of the control power supply 2b is Of the auxiliary battery 94 is maintained.

  As described above, according to the fourth embodiment, the same effects as in the second embodiment can be obtained. Specifically, when the control power supply 2a (or 2b) is not operated, the auxiliary battery 94 can be disconnected. Further, for example, when the user pushes the switch 32 (or 33), the voltage from the auxiliary battery 94 is input to the control power supply 2a (or 2b), and the voltage output from the control power supply 2a (or the control power supply 2b is output). Voltage or the voltage from the charge / discharge control unit 10 operated by the circuit power supply from the control power supply 2b) is applied to the relay coil of the relay 31 to turn on the relay contact, so that after the switch 32 (or 33) is opened. It is also possible to continuously input the voltage from the auxiliary battery 94 to the control power supply 2a (or 2b).

  According to the fourth embodiment, the same effects as in the third embodiment can be obtained. Specifically, since the auxiliary battery 94 and the built-in battery 21 are connected in parallel, a voltage can be input from at least one of the batteries to the control power supply 2a or 2b.

(Embodiment 5)
Embodiment 3 is a form in which the built-in battery 21 is not disconnected from the control power supply 2a, whereas Embodiment 5 is a form in which the built-in battery 21 is separated from the control power supply 2a when the auxiliary battery 94 is connected. is there. The main configuration of the charging / discharging device 1 in the fifth embodiment is the same as that shown in FIG. 1 of the first embodiment, and the same reference numerals are given to portions corresponding to the first and third embodiments. The description is omitted.

  6A and 6B are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 5 of the present invention. 6A and 6B are coupling circuits 3i and 3j, respectively. The other input terminals of the coupling circuits 3i and 3j are connected to the built-in battery 21.

  Coupling circuit 3i is different from coupling circuit 3f shown in FIG. 4B of the third embodiment in that a relay (third connection) is provided between point P where auxiliary battery 94 and internal battery 21 are connected in parallel and another input terminal. (Equivalent to a switch) 36 in that a normally closed relay contact is connected and a relay coil of the relay 36 is connected between the anode of the diode 34 and the FG. The coupling circuit 3j is different from the coupling circuit 3i in that the relay 36 is replaced with a relay 36a including normally open and normally closed relay contacts, and that the relay 36a is connected between the point P and the cathode of the diode 34. The difference is that a normally open relay contact is provided.

  The relays 36 and 36a are not limited to those using coils such as electromagnetic relays, and may be semiconductor relays. For example, a voltage from the auxiliary battery 94 is detected by a photocoupler to drive another relay. Thus, the built-in battery 21 may be separated by a relay contact. In this case, a voltage applied to a relay coil of another relay can be a voltage based on an AC voltage from the power system 200.

  In each of FIGS. 6A and 6B, when the voltage from the auxiliary battery 94 is not input to one input terminal of the coupling circuits 3i and 3j, the relays 36 and 36a have no voltage applied to the relay coils and are normally closed. Type relay contacts are on. Therefore, the control power supply 2 a operates by the voltage from the built-in battery 21. The diode 34 prevents a voltage from being applied from the internal battery 21 to the relay coils of the relays 36 and 36a. When the power system 200 is not out of power, the built-in battery 21 can be charged by the control power supply 2a.

  Particularly, in the coupling circuit 3j, since a normally open relay contact is interposed in series with the diode 34, a period from when a voltage is applied to the relay coil of the relay 36a to when the normally closed relay contact is turned off. The charging current does not flow from the auxiliary battery 94 to the built-in battery 21 via the diode 34, the point P, and the normally closed relay contact.

  Next, when a voltage from the auxiliary battery 94 is input to one input terminal of each of the coupling circuits 3i and 3j, a voltage is applied to the relay coils of the relays 36 and 36a, and the normally closed relay contact is turned off. Therefore, the built-in battery 21 is disconnected from the control power supply 2a. In this case, a voltage is input to the control power supply 2 a from the auxiliary battery 94 via the diode 34. As described above, diode 34 prevents the charging current from flowing from control power supply 2a to auxiliary battery 94.

As described above, according to the fifth embodiment, between the point at which auxiliary battery 94 and internal battery 21 are connected in parallel and internal battery 21, the battery is normally turned off by the voltage from auxiliary battery 94. Closed relay contacts are interposed.
Therefore, when the auxiliary battery 94 is connected, the relay contact is turned off and the internal battery 21 is disconnected from the control power supply 2a, so that the internal battery 21 is prevented from being discharged to the control power supply 2a, It is possible to prevent charging from being performed.

(Embodiment 6)
In the fifth embodiment, the current continues to flow from the connected auxiliary battery 94 to the relay coil of the relay 36, whereas in the sixth embodiment, the voltage supply source of the control power supply 2a is an AC-side input. This is a mode of preventing current from flowing into the relay coil of the relay 36 when the terminal pair is used. The main configuration of the charge / discharge device 1 according to the sixth embodiment is the same as that shown in FIG. 1 of the first embodiment, and the same reference numerals are given to portions corresponding to the first and fifth embodiments. The description is omitted.

  FIG. 7 is a circuit diagram showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 6 of the present invention. In FIG. 7, reference numeral 3k denotes a coupling circuit. The coupling circuit 3k has another input terminal connected to the built-in battery 21.

  The coupling circuit 3k is different from the coupling circuit 3i of the fifth embodiment shown in FIG. 6A in that one terminal of the relay coil of the relay 36 (corresponding to a terminal for controlling ON / OFF of the third switch) is connected to the relay (the A point connected to the anode of the diode 34 via a normally closed relay contact 37 and a relay coil of the relay 37 are connected to an input terminal pair on the AC side of the control power supply 2a. The point is different.

  In FIG. 7, when an AC voltage is not input to the input terminal pair on the AC side of the control power supply 2 a (including a case where the power system 200 is out of power), the relay contact of the relay 37 is turned on. The circuit 3k is equivalent to the coupling circuit 3i of the fifth embodiment shown in FIG. 6A. That is, when the voltage from the auxiliary battery 94 is not input to one input terminal of the coupling circuit 3k, the control power supply 2a operates by the voltage from the built-in battery 21, and the voltage from the auxiliary battery 94 When input to the terminal, the built-in battery 21 is disconnected from the control power supply 2a.

  On the other hand, when an AC voltage is being input to the input terminal pair on the AC side of the control power supply 2a (including a case where the power system 200 is not out of power), the AC voltage is applied to the relay coil of the relay 37 and the relay contact is closed. The relay turns off, and the voltage from the auxiliary battery 94 is not applied to the relay coil of the relay 36. In this case, since the relay contact of the relay 36 is turned on, the built-in battery 21 can be charged by the control power supply 2a.

As described above, according to the sixth embodiment, the auxiliary battery is connected to one terminal of the relay coil of the relay 36 via the normally closed relay contact that is turned off when the voltage from the power system 200 is applied. A drive voltage is applied from 94.
Therefore, when the power system 200 is not out of power, the relay contact is off, and no current flows into the relay coil of the relay 36, so that the discharge of the auxiliary battery 94 can be prevented.

(Embodiment 7)
While the fifth and sixth embodiments have no connection at both ends of the relay contact of the relay 36, the seventh embodiment has a configuration in which diodes are connected at both ends of the relay contact of the relay 36. It is. The configuration of the main part of the charge / discharge device 1 in the seventh embodiment is the same as that shown in FIG. 1 of the first embodiment. The description is omitted.

  8A and 8B are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 7 of the present invention. 8A and 8B, reference numerals 3m and 3n denote coupling circuits. The coupling circuits 3m and 3n have other input terminals connected to the built-in battery 21.

  The coupling circuit 3m is different from the coupling circuit 3i of the fifth embodiment shown in FIG. 6A in that a diode 35 (corresponding to a second diode) is connected to both ends of the relay contact of the relay 36 with the cathode facing the point P. Are different. The coupling circuit 3n is different from the coupling circuit 3k of the sixth embodiment shown in FIG. 7 in that a diode 35 is connected to both ends of the relay contact of the relay 36 with the cathode directed to the point P.

  8A and 8B, when the voltage from the auxiliary battery 94 is not input to one input terminal of the coupling circuits 3m and 3n, no voltage is applied to the relay coil of the relay 36, and the relay contact turns on. ing. Therefore, similarly to the fifth and sixth embodiments, the control power supply 2a operates by the voltage from the built-in battery 21. When the power system 200 is not out of power, the built-in battery 21 can be charged by the control power supply 2a.

  Next, when the voltage from the auxiliary battery 94 is input to one input terminal of the coupling circuits 3m and 3n (when the relay contact of the relay 37 is turned on in the coupling circuit 3n), the relay of the relay 36 is turned on. Since a voltage is applied to the coil and the relay contact is turned off, the built-in battery 21 is connected to the control power supply 2a via the diode 35. In this case, the built-in battery 21 and the auxiliary battery 94 are in a so-called diode butted state.

As described above, according to the seventh embodiment, when the relay contact of the relay 36 is off, that is, when the auxiliary battery 94 is connected, the voltage is input from the internal battery 21 to the control power supply 2a. A diode 35 is connected between both ends of the relay contact of the relay 36.
Therefore, while receiving the voltage from the auxiliary battery 94, it is possible to input a voltage from at least one of the auxiliary battery 94 and the built-in battery 21 to the control power supply 2a.

(Embodiment 8)
In the third embodiment, the auxiliary battery 94 and the built-in battery 21 are connected in parallel at the point P, whereas in the eighth embodiment, the auxiliary battery 94 and the built-in battery 21 Are connected in parallel in a broad sense. The main configuration of the charging / discharging device 1 according to the eighth embodiment is the same as that shown in FIG. 1 of the first embodiment. Is omitted.

  9A and 9B are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 8 of the present invention. 9A and 9B, 3p and 3q are coupling circuits, respectively. The coupling circuits 3p and 3q are two-circuit, two-contact (double-pole, double-throw) switches (corresponding to a fifth switch) 38 and three-circuit-linked one-circuit 1, respectively. It has switches 39a, 39b, 39c of contact points (single pole, single throw).

  In the coupling circuit 3p, the common contact of the first circuit of the switch 38 is connected to the output terminal of the coupling circuit 3p, and the normally closed contact is connected to the plus terminal of the built-in battery 21 via another input terminal of the coupling circuit 3p. The normally open contact is connected to one input terminal of the coupling circuit 3p via the diode 34. In the coupling circuit 3p, the common contact of the second circuit of the switch 38 is connected to the FG, and the normally closed contact is connected to the minus terminal of the built-in battery 21 via the third input terminal of the coupling circuit 3p. .

  The coupling circuit 3q replaces the normally closed contact and the normally open contact of the first circuit with the normally closed contact switch 39a and the normally open contact switch 39b, respectively, and switches the normally closed contact of the second circuit. The contact is replaced by a normally closed contact switch 39c. Therefore, the coupling circuits 3p and 3q are electrically equivalent. By switching the switches 38 and 39a, 39b, 39c by the coupling circuits 3p and 3q, respectively, one of the auxiliary battery 94 and the built-in battery 21 is connected to the control power supply 2a.

  As described above, according to the eighth embodiment, the auxiliary power supply 94 and the built-in battery 21 are switched by the two-circuit two-contact switch 38 (or the one-circuit one-contact switch 39a, 39b, 39c) to control the control power 2a. , It is possible to prevent interference between the two batteries. When the auxiliary battery 94 is connected to the control power supply 2a, the built-in battery 21 can be completely disconnected from the auxiliary battery 94.

(Embodiment 9)
Embodiment 8 is a mode in which the auxiliary battery 94 and the built-in battery 21 are switched by a two-circuit, two-contact double-sided switch 38 (or switches 39a, 39b, 39c). This is a mode in which the battery is switched by a one-circuit, two-contact one-piece switch. The configuration of the main part of the charging / discharging device 1 according to the ninth embodiment is the same as that shown in FIG. 1 of the first embodiment. Is omitted.

  FIGS. 10A and 10B are circuit diagrams showing a configuration of a coupling circuit in charge / discharge device 1 according to Embodiment 9 of the present invention. In FIGS. 10A and 10B, reference numerals 3r and 3s denote coupling circuits. Each of the coupling circuits 3r and 3s is a one-circuit, two-contact (single-pole, double-throw) switch (corresponding to a sixth switch) 40 and one circuit linked to two circuits It has switches 41a and 41b of one contact point (single pole single throw).

  In the coupling circuit 3r, a common contact of the switch 40 is connected to an output terminal of the coupling circuit 3r, and a normally closed contact is connected to a plus terminal of the built-in battery 21 via another input terminal of the coupling circuit 3r. The normally open contact is connected to one input terminal of the coupling circuit 3r via the diode 34.

  The coupling circuit 3s is obtained by replacing the normally closed contact and the normally open contact of the switch 40 in the coupling circuit 3r with a normally closed contact switch 41a and a normally open contact switch 41b. Therefore, the coupling circuits 3r and 3s are electrically equivalent. By switching the switches 40, 41a, and 41b in the coupling circuits 3r and 3s, respectively, one of the auxiliary battery 94 and the built-in battery 21 is connected to the control power supply 2a.

  As described above, according to the ninth embodiment, the auxiliary battery 94 and the built-in battery 21 are switched by the one-circuit two-contact switch 40 (or the one-circuit one-contact switches 41a and 41b) and connected to the control power supply 2a. Therefore, it is possible to prevent interference between the two batteries.

According to the first to ninth embodiments, the charging / discharging connector 50 for connecting to the vehicle 9 and the charging start signal_1 (or the preparation completion notification signal) transmitted through the charging / discharging connector 50 are based on the CHAdeMO standard. Or, it complies with the charging and discharging system guidelines for electric vehicles.
Therefore, when a current signal conforming to the CHAdeMO standard or the electric vehicle charging / discharging system guideline is transmitted from the relay contact of the relay d1 (or the photodiode of the photocoupler j) as the transmitting unit, and the main battery 92 is charged and discharged. In addition, it is possible to prevent the current from flowing around the transmission unit and to ensure safety.

Further, according to the first to ninth embodiments, the charging / discharging control unit 10 controls the sending circuit to send a signal current, and the bidirectional inverter 14 converts the DC voltage and the AC voltage to bidirectional, and 92 is charged and discharged.
Therefore, it is possible to perform charging / discharging safely by applying to the charging / discharging device 1 a transmitting circuit capable of preventing a current from sneaking in a circuit for transmitting a current signal.

  Note that, similarly to the relay 36, the relays 31 and 37 are not limited to those using coils such as electromagnetic relays, and may be other switches such as semiconductor relays and switching elements. The switches 32, 33, 38, and 40 are not limited to mechanical switches, and may be other switches such as an electromagnetic relay, a semiconductor relay, and a switching element. The vehicle 9 is not limited to an automobile, but may be any external device that can be connected to transmit and receive a predetermined signal via a connector. The auxiliary battery 94 and the built-in battery 21 are based on electric charges stored in an electric double layer capacitor or the like. The power source may be a power source or a power source having a power generation function such as a fuel cell.

  The embodiment disclosed this time is an example in all respects, and should be considered as not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Further, the technical features described in the embodiments can be combined with each other.

DESCRIPTION OF SYMBOLS 1 Charge / discharge device 10 Charge / discharge control part 14 Bidirectional inverter 2, 2a, 2b Control power supply 21 Built-in battery 31, 36, 36a, 37 Relay 32, 33, 38, 40 Switch 34, 35 Diode 5 Charge / discharge cable 50 Charge / discharge Connector 58 FG terminal 581 Ground wire 60 Inlet 70 Cigar plug 80 Cigar socket 9 Vehicle 90 Power storage control unit 92 Main battery 94 Auxiliary battery 200 Power system 201 Distribution board d1, d2 Relay j Photocoupler k Transistor R1, R2, R4 Resistance vessel

Claims (12)

A connector for transmitting and receiving a predetermined signal to and from an external device, and a transmission circuit including a transmission unit that transmits a signal current of the predetermined signal to the external device,
The connector has a terminal included in a return current path of the predetermined signal,
It has a DC / DC converter in which the input and output are DC-insulated,
A voltage is applied to the DC / DC converter from the other end of the external DC power supply having one end connected to the terminal, and an output voltage of the DC / DC converter is supplied to the transmission unit. Outgoing circuit.   The transmission circuit according to claim 1, further comprising a second connector for connecting to the DC power supply. A normally-open first switch interposed in an electric circuit for connecting the DC / DC converter to the DC power supply;
A normally-open and momentary-type second switch connected between both ends of the first switch;
The transmission circuit according to claim 1, wherein the first switch is turned on by a voltage related to an output voltage of the DC / DC converter.   The transmission circuit according to any one of claims 1 to 3, further comprising a second DC power supply connected to an electric circuit for connecting the DC / DC converter to the DC power supply.   The device according to claim 4, further comprising a first diode having a cathode disposed toward the connection point at a position closer to the DC power supply than a connection point with the second DC power supply in the electric circuit. Sending circuit. A normally closed third switch interposed between the connection point and the second DC power supply;
The transmission circuit according to claim 5, wherein the third switch is turned off by a voltage from the DC power supply. The third switch has a terminal for controlling on / off,
A normally-closed fourth switch for connecting the terminal to a position on the anode side of the first diode in the electric circuit,
The transmission circuit according to claim 6, wherein the fourth switch is turned off by a voltage from a power system.   The transmission circuit according to claim 6, further comprising a second diode connected between both ends of the third switch, with a cathode connected to the second DC power supply.   A second circuit / two-contact fifth switch that switches between both ends of the DC power supply and the second DC power supply and connects to the DC / DC converter at a connection point of the electric circuit with the second DC power supply; The sending circuit according to claim 4 or 5, wherein:   A switching circuit that switches between the DC power supply and the second DC power supply at a connection point between the second DC power supply and the second DC power supply in the electric circuit and connects to the DC / DC converter; The transmission circuit according to claim 4 or 5, wherein   The connector and the predetermined signal conform to the CHAdeMO standard standardized by the CHAdeMO Council or the electric vehicle charging / discharging system guidelines standardized by the Electric Vehicle Power Supply System Council. The transmission circuit according to any one of claims 10 to 13. A sending circuit according to any one of claims 1 to 11,
A control unit for causing the transmission circuit to transmit the signal current;
A conversion unit that converts a DC voltage and an AC voltage to bidirectional,
A charge / discharge device, wherein the conversion unit is used to charge / discharge a storage battery of the external device (or discharge a fuel cell).

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