JP2018007510A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power supply system 1 capable of detecting presence/absence of connection of a charge/discharge connector 3 without using a charge/discharge connector connection confirmation signal.SOLUTION: A power supply system 1 has a charger/discharger 5 for exchanging power with a drive on-vehicle battery 22 being a secondary battery of an electric automobile 2 via a charge/discharge connector 3. The system includes: a first connection detector 14 for detecting a connection state of the charge/discharge connector 3; a CAN circuit 15 for performing data communication according to a CAN communication protocol between the power supply system 1 and the electric automobile 2; a second connection detector 100 for measuring a termination resistance value of a CAN communication line 37 connected to the CAN circuit 15; and a control section 16 for determining the presence/absence of connection of the charge/discharge connector 3 and controlling the charger/discharger 5 through the use of a first connection detection signal 14a to be output from the first connection detector 14, a second connection detection signal 100a to be output from the second connection detector 100, and data of the data communication to be performed by the CAN circuit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric power supply system that can exchange electric power with an electric vehicle.

  In recent years, a V2H (Vehicle to Home) system that uses an in-vehicle battery for driving an electric vehicle as a residential load has been put into practical use and is becoming popular. In the V2H system, the power of the on-vehicle battery for driving the electric vehicle is charged at night when the electricity bill of the electric power company is low, and the electric vehicle can be run using the power of the on-vehicle battery for driving during the day.

  In such a V2H system, the charge / discharge connector of the power supply system is connected to the charge / discharge port of the electric vehicle, and control is performed between the power supply system and the electric vehicle according to the charge / discharge interface and sequence defined in the guidelines. The signal is turned on / off, and a current instruction value, a voltage measurement result, a current measurement result, a flag indicating a charge / discharge state, and a flag indicating a state of the electric vehicle, which are parameters for charge / discharge control, are transmitted and received. Therefore, in the V2H system, communication is performed according to a CAN (Controller Area Network) communication protocol, and charging / discharging is performed according to this data. The CAN communication is a serial communication conforming to the ISO (International Organization for Standardization) standard.

  The control signal of the V2H system includes an operation start / stop 1 signal that is a first operation start / stop signal by a d1 relay and a d2 relay on the power supply system side, and an operation start / stop 2 signal that is a second operation start / stop signal, An operation permission prohibition signal indicating charge / discharge permission or charge / discharge prohibition from the electric vehicle side and a charge / discharge connector connection confirmation signal for preventing erroneous start of the electric vehicle when the charge / discharge connector is connected can be exemplified. In CAN communication, transmission / reception of data is started with a trigger of the operation start / stop 1 signal, which is the first operation start / stop signal, changing to the operation start side.

  In the V2H system, when the electric vehicle is parked at home, a case where the charging / discharging connector is connected to the electric vehicle and charging / discharging is not started is also assumed. At this time, in order to perform the charge / discharge operation from the screen of the display operation remote controller installed in the house, even during standby before the start of charge / discharge, information on the presence / absence of connector connection between the power supply system and the electric vehicle and the electric vehicle There is a demand for making it possible to obtain vehicle information including the remaining battery level of the on-vehicle battery for driving on the power supply system side. Such information on the presence / absence of connector connection and vehicle information on the electric vehicle are acquired by CAN communication. However, in the conventional configuration, information on CAN communication cannot be acquired unless the d1 relay is turned on by a charge / discharge start operation. .

  In Patent Document 1 as an example of the prior art, charging / discharging in which the connection state between the vehicle and the charger can be grasped on the charger side without turning on the d1 relay and performing communication between the vehicle and the charger. A device is disclosed, and a technology that can determine whether a charge / discharge connector is connected on the charger side by detecting the presence / absence of current by providing a photocoupler on a charge / discharge connector connection confirmation signal line is disclosed. Yes.

JP 2014-217083 A

  However, according to the above conventional technique, a charge / discharge connector connection confirmation signal is required to detect whether the charge / discharge connector is connected.

  This invention is made in view of the above, Comprising: It aims at obtaining the electric power supply system which can detect the presence or absence of the connection of a charging / discharging connector, without using a charging / discharging connector connection confirmation signal.

  In order to solve the above-described problems and achieve the object, the present invention provides a power supply system that transfers power through a storage battery and a charge / discharge connector of an electric vehicle, and detects a connection state of the charge / discharge connector. Measuring a termination resistance value of a CAN communication line connected to the CAN circuit, a CAN circuit that performs data communication according to a CAN communication protocol between the first connection detector, the power supply system, and the electric vehicle A second connection detector, a first connection detection signal output from the first connection detector, a second connection detection signal output from the second connection detector, and data communication performed by the CAN circuit. And a controller for determining whether or not the charge / discharge connector is connected and controlling the charger / discharger using data.

  The power supply system according to the present invention has an effect that it is possible to obtain a power supply system that can detect whether or not the charge / discharge connector is connected without using the charge / discharge connector connection confirmation signal.

The figure which shows the example of 1 structure of the electric power supply system which concerns on embodiment, and the electric vehicle connected to this electric power supply system The figure which shows the example of 1 structure of the 2nd connection detector shown in FIG. The flowchart which shows the operation | movement at the time of a 1st connection detector determining a connection state using a charging / discharging connector connection confirmation signal. The flowchart which shows operation | movement of the 2nd connection detector and control part at the time of a 2nd connection detector determining a connection state. FIG. 3 is a logic diagram showing a configuration example of a determination unit that determines the connection state of an electric vehicle using latch data of the first connection detection signal, latch data of the second connection detection signal, and CAN communication data of the CAN circuit. The flowchart which shows one operation example of the control part at the time of displaying whether the electric vehicle is connected to the display operation remote control The flowchart which shows one operation example of the control part at the time of displaying the battery remaining amount of an electric vehicle on a display operation remote control

  Hereinafter, a power supply system according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a power supply system 1 according to an embodiment of the present invention and an electric vehicle 2 connected to the power supply system 1. The power supply system 1 includes a charge / discharge connector cable 4 having a charge / discharge connector 3. The electric vehicle 2 includes a charge / discharge port 20. When the charging / discharging connector 3 is connected to the charging / discharging port 20, the power supply system 1 and the electric vehicle 2 are connected, and power can be exchanged between them.

  A power supply system 1 shown in FIG. 1 includes a charger / discharger 5, an inverter 6, a distribution board 7, a d1 relay 11, a d2 relay 12, a resistor 13, a first connection detector 14, and a CAN. The circuit 15 includes a control unit 16, a termination resistor 17, a remote control transmission / reception unit 18, and a second connection detector 100.

  An electric vehicle 2 shown in FIG. 1 includes a vehicle contactor 21, a drive-mounted battery 22, a resistor 23, a vehicle-side connection detector 24, a CAN circuit 25, and a termination resistor 26.

  The charge / discharge connector cable 4 shown in FIG. 1 includes a positive side DC power line 31, a negative side DC power line 32, a first operation start / stop line 33, a second operation start / stop line 34, and a charge / discharge connector connection confirmation. A line 35, a ground line 36, and a CAN communication line 37 are provided.

  The charger / discharger 5 is a DCDC bidirectional power converter, and is disposed between the positive side DC power line 31 and the negative side DC power line 32 and the inverter 6. The inverter 6 is an ACDC bidirectional power converter, and is arranged between the charger / discharger 5 and the distribution board 7. The distribution board 7 is connected to the inverter 6, the system power supply 8 outside the power supply system 1, and the home load 9.

  In addition, the household load 9 can be illustrated as the household load 9. Note that power transfer between the power supply system 1 and the electric vehicle 2 is performed via the distribution board 7, and power from the electric vehicle 2 is supplied to the system power supply 8 and the in-home load 9, and from the system power supply 8. Is supplied to the electric vehicle 2.

  The d1 relay 11 is arranged between the power supply potential line of the power supply system 1 and the first operation start / stop line 33, and is on / off controlled by a d1 on signal 11a from the control unit 16. The d2 relay 12 is arranged between the ground potential line and the second operation start / stop line 34, and is on / off controlled by a d2 on signal 12 a from the control unit 16. The resistor 13 is arranged between the ground potential line and the charge / discharge connector connection confirmation line 35, and when the charge / discharge connector 3 and the charge / discharge port 20 are connected, a current flows through the resistor 13. The first connection detector 14 detects a voltage obtained by converting the current flowing through the resistor 13 and outputs a first connection detection signal 14 a to the control unit 16. The CAN circuit 15 is a transceiver and receiver for CAN communication provided on the power supply system 1 side. The control unit 16 receives information from each component of the power supply system 1 and outputs information to each component. The termination resistor 17 is disposed between the CAN circuit 15 and the CAN communication line 37.

  The vehicle contactor 21 is an electromagnetic switch that opens and closes the positive DC power line 31 and the negative DC power line 32 by energizing the first operation start / stop line 33 and the second operation start / stop line 34. The on-vehicle battery 22 for driving is a storage battery connected to the positive side DC power line 31 and the negative side DC power line 32 via the vehicle contactor 21. The resistor 23 is disposed between the vehicle-side connection detector 24 and the charge / discharge connector connection confirmation line 35. The vehicle-side connection detector 24 is connected to the power supply potential line of the electric vehicle 2 and is connected to the charge / discharge connector connection confirmation line 35 via the resistor 23. When the charge / discharge connector 3 is connected to the charge / discharge port 20, the power supply potential line of the electric vehicle 2 is connected to the charge / discharge connector connection confirmation line 35 via the resistor 23 and the vehicle-side connection detector 24. The CAN circuit 25 is a transceiver and receiver for CAN communication provided on the electric vehicle 2 side, and performs CAN communication with the CAN circuit 15 provided on the power supply system 1 side. The termination resistor 26 is disposed between the CAN circuit 25 and the CAN communication line 37.

  The positive-side DC power line 31 and the negative-side DC power line 32 are wirings for transferring power between the power supply system 1 and the electric vehicle 2. The first operation start / stop line 33 and the second operation start / stop line 34 are wirings for transmitting an operation start / stop signal for turning on / off the vehicle contactor 21 by turning on / off the d1 relay 11 and the d2 relay 12. The charge / discharge connector connection confirmation line 35 is a wire for confirming whether or not the charge / discharge connector 3 is connected, and is connected to the resistor 13 on the power supply system 1 side and the resistor 23 on the electric vehicle 2 side. The ground line 36 is a ground potential line. The CAN communication line 37 is a communication line for performing CAN communication, and includes a CAN-H line 37a and a CAN-L line 37b as shown in FIG. 2 to be described later, between the power supply system 1 and the electric vehicle 2. Data is transmitted and received by the CAN communication protocol.

  The display operation remote controller 10 that is a user interface includes a display operation unit (not shown) that displays the state of the power supply system 1 and performs an operation, and sends a driving command based on a user operation via the remote control transmission / reception unit 18. Output to. When the charge / discharge connector changes from the non-connected state to the connected state during standby before the power supply system 1 starts charging / discharging, the control unit 16 starts the operation indicating the start and end of the charge / discharge operation to the electric vehicle 2. Outputs a stop signal. The display operation remote controller 10 receives the operation status information of the power supply system 1, the remaining battery level information of the in-vehicle battery 22 for driving the electric vehicle 2 and the vehicle connection status information acquired by CAN communication by data communication, and displays these information. It is displayed on the display screen which is the operation unit. A touch panel can be illustrated as a display operation part.

  The second connection detector 100 is connected to the CAN communication line 37, detects the connection resistance of the connector indirectly by measuring the termination resistance value of the CAN communication line 37, and controls the charger / discharger 5. The second connection detection signal 100a is output. The control unit 16 determines the connection state based on the first connection detection signal 14a, the second connection detection signal 100a, and the data of CAN communication, and controls the charger / discharger 5.

  In addition, the wiring of the charging / discharging connector cable 4 shown in FIG. 1 has shown only one part wiring used for description of this Embodiment, and the charging / discharging connector cable 4 may be provided with wiring other than these.

  FIG. 2 is a diagram illustrating a configuration example of the second connection detector 100 illustrated in FIG. 1. The second connection detector 100 shown in FIG. 2 includes resistors 101, 102, and 103, a field effect transistor (FET) 104 that is a field effect transistor, a constant current circuit 110 having a diode 105 and an amplifier 106, an amplifier 107, The switch circuit 108 is provided. 2 that are the same as those shown in FIG. 1 are not described here.

  Here, the resistance values of the termination resistor 17 and the termination resistor 26 are 120Ω in conformity with ISO. The second connection detector 100 measures a resistance value between two differential signals of the CAN-H line 37 a and the CAN-L line 37 b of the CAN communication line 37. Here, the measured resistance value is the resistance value 120Ω of the termination resistor 17 when the charge / discharge connector is not connected, and with the termination resistor 17 connected in parallel when the charge / discharge connector is connected. The combined resistance with the terminating resistor 26 is 60Ω. Accordingly, when the detection resistance value of the second connection detector 100 is 60Ω, it is determined that the charge / discharge connector is connected, and when it is 120Ω, it is determined that the charge / discharge connector is not connected.

  Next, an end point resistance measurement unit using the constant current circuit 110 will be described as an example of resistance measurement using the second connection detector 100. However, the measurement of the resistance value in the present invention is not limited to this.

  In the constant current circuit 110, when a constant current of 10 mA is passed from D of the FET 104, that is, the drain, when the resistance value measured by the second connection detector 100 is 60Ω, 10 mA × 60Ω = 0.6 V. When the resistance value measured in the connection detector 100 of 2 is 120Ω, 10 mA × 120Ω = 1.2V. The voltage difference is amplified by the amplifier 107, and the second connection detection signal 100 a that is the amplified output is input to the control unit 16.

  The second connection detector 100 includes a switch circuit 108 between the constant current circuit 110 and the CAN communication line 37. The switch circuit 108 is turned on / off by an on / off signal 108a output from the control unit 16, that is, electrically connected and disconnected. When the switch circuit 108 is turned on, the CAN communication line 37 and the second connection detector 100 are turned on. Are connected and the switch circuit 108 is turned off, the CAN communication line 37 and the second connection detector 100 are disconnected and disconnected. Since the d1 relay 11 is turned on at the start of CAN communication, when the control unit 16 outputs a signal for turning off the switch circuit 108 as the on / off signal 108a when the d1 relay 11 is turned on, it is possible to prevent interference with the CAN communication. .

  Next, an operation for determining the connection state of the connector will be described. FIG. 3 is a flowchart showing an operation when the first connection detector 14 determines the connection state using the charge / discharge connector connection confirmation line 35. First, the first connection detector 14 determines whether or not the charge / discharge connector connection confirmation line 35 is connected (S20). When the charge / discharge connector connection confirmation line 35 is connected (S20: Yes), the first connection detector 14 outputs 1 as the first connection detection signal 14a (S22), and the charge / discharge connector connection confirmation. When the line 35 is not connected (S20: No), the first connection detector 14 outputs 0 as the first connection detection signal 14a (S21). Thus, in the configuration of the present embodiment, it is also possible to detect the presence or absence of connector connection using the charge / discharge connector connection confirmation line 35.

  FIG. 4 is a flowchart showing the operations of the second connection detector 100 and the control unit 16 when the second connection detector 100 determines the connection state. First, the control unit 16 determines whether or not the d1 relay 11 is turned on (S30). When the d1 relay 11 is on (S30: Yes), since CAN communication is in progress, the controller 16 turns off the switch circuit 108 to prevent interference (S31), and the second connection detector 100 0 is output as the second connection detection signal 100a (S38). When the d1 relay 11 is not turned on (S30: No), the control unit 16 turns on the switch circuit 108 (S32), connects the CAN communication line 37, and the second connection detector 100 is terminated. Is measured (S33), the second connection detection signal 100a is latched (S34), and the switch circuit 108 is turned off (S35). Then, the control unit 16 determines whether or not the latch data latched in S34 indicates that there is a connection (S36). When the latch data indicates that there is connection (S36: Yes), 1 is output as the latch data (S37), and when the latch data does not indicate that there is connection (S36: No), the latch data 0 is output as (S38).

  FIG. 5 illustrates a determination device that determines the connection state of the electric vehicle 2 using the latch data of the first connection detection signal 14a, the second connection detection signal 100a, and the CAN communication data of the CAN circuits 15 and 25. It is a logic diagram which shows one structural example. Such a determiner may be provided in the control unit 16. The determiner shown in FIG. 5 includes an OR gate 200 and an AND gate 201. The AND gate 201 receives latch data of the second connection detection signal 100a and a connection signal of CAN communication data. The OR gate 200 receives the first connection detection signal 14 a that is the output of the first connection detector 14 and the output signal of the AND gate 201. As described above, the second connection detection signal 100a cannot be used when the d1 relay 11 is turned on, that is, during CAN communication. Therefore, the determiner shown in FIG. 5 interpolates by using the presence / absence of connection based on CAN communication data.

  Further, by using the determination device shown in FIG. 5, it is possible to detect the presence / absence of connection of the charge / discharge connector without using the charge / discharge connector connection confirmation signal. Therefore, it is possible to deal with a vehicle type that does not support the first connection detection signal 14a. The connection determination signal that is an output signal of the OR gate 200 is 1 when connection is established, and is 0 when connection is not established.

  FIG. 6 is a flowchart illustrating an operation example of the control unit 16 when displaying whether or not the electric vehicle 2 is connected to the display operation remote controller 10. First, the control unit 16 determines whether or not the connection determination signal shown in FIG. 5 is a signal indicating connection (S40). When the connection determination signal is a signal indicating connection (S40: Yes), the control unit 16 performs a vehicle connection display indicating that the electric vehicle 2 is connected to the display operation remote controller 10. A command to that effect is output (S41), and the process ends. When the connection determination signal is not a signal indicating connection (S40: No), the control unit 16 displays a vehicle unconnected display indicating that the electric vehicle 2 is not connected to the display operation remote controller 10. A command to the effect is output (S42), and the process ends.

  FIG. 7 is a flowchart illustrating an operation example of the control unit 16 when displaying the battery remaining amount of the electric vehicle 2 on the display operation remote controller 10. First, the control unit 16 determines whether or not the connection determination signal shown in FIG. 5 has changed from a signal indicating no connection to a signal indicating connection (S50). If the connection determination signal does not change from the signal indicating no connection to the signal indicating connection (S50: No), the determination is performed again. In other words, in S50, the control unit 16 constantly monitors until the connection determination signal changes. When the connection determination signal changes from a signal indicating no connection to a signal indicating connection (S50: Yes), the control unit 16 turns on the d1 relay 11 (S51). When the d1 relay 11 is turned on, CAN communication is started on the CAN communication line 37, and the control unit 16 acquires vehicle information of the electric vehicle 2 (S52). When the d1 relay 11 is turned off immediately after obtaining the vehicle information of the electric vehicle 2 (S53), the screen of the display operation remote controller 10 is displayed on the screen of the display operation remote controller 10 even during standby before the power supply system 1 starts charging / discharging. The remaining battery level of the on-vehicle battery 22 for driving can be displayed (S54). Information that can be displayed on the screen of the display operation remote controller 10 is not limited to the remaining battery level, but includes all vehicle information of the electric vehicle 2.

  As described above, in the power supply system 1 according to the present embodiment, the differential termination resistance value of the CAN communication changes in addition to the first connection detector 14 that detects the charge / discharge connector connection confirmation signal. A second connection detector 100 is provided for detecting the presence or absence of connector connection using. Therefore, the presence / absence of connection of the charge / discharge connector can be detected without using the charge / discharge connector connection confirmation signal.

  In the power supply system 1 according to the present embodiment, the switch circuit 108 is operated by an FET formed of a semiconductor. Therefore, it is not necessary to monitor the state by turning on / off the d1 relay 11 that is a mechanical relay at a constant cycle, so that the life of the relay is not shortened and the power consumption is not increased.

  Moreover, when the 2nd connection detector 100 is used like the power supply system 1 which concerns on this Embodiment, the information of the presence or absence of a connector connection can be acquired without performing CAN communication by actual charging / discharging start operation. it can. Therefore, it is possible to determine whether or not there is a connection with the electric vehicle 2 even during standby before the power supply system 1 starts charging / discharging regardless of the vehicle type, and the electric vehicle 2 is connected to the power supply system 1. Can be displayed on the screen of the display operation remote controller 10.

  Furthermore, when the second connection detector 100 is used as in the power supply system 1 according to the present embodiment, it is possible to determine whether or not the electric vehicle 2 and the charge / discharge connector 3 are connected. Therefore, when the state changes from the state where the charge / discharge connector is not connected to the state where it is connected, the d1 relay 11 is turned on once and the remaining battery capacity of the on-vehicle battery 22 for driving is started by CAN communication. After obtaining the vehicle information, the d1 relay 11 is actually turned off without charging / discharging. By operating in this manner, even when the power supply system 1 is on standby before starting charging / discharging, the vehicle including the remaining battery level of the in-vehicle battery 22 for driving the electric vehicle 2 is displayed on the screen of the display operation remote controller 10. Information can be displayed.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Power supply system, 2 Electric vehicle, 3 Charging / discharging connector, 4 Charging / discharging connector cable, 5 Charging / discharging device, 6 Inverter, 7 Distribution board, 8 system power supply, 9 Home load, 10 Display operation remote control, 11 d1 relay, 11a d1 ON signal, 12 d2 relay, 12a d2 ON signal, 13, 23, 101, 102, 103 resistor, 14 first connection detector, 14a first connection detection signal, 15, 25 CAN circuit, 16 control unit , 17, 26 Terminal resistor, 18 Remote control transmission / reception unit, 20 Charging / discharging port, 21 Vehicle contactor, 22 Car battery for driving, 24 Vehicle side connection detector, 31 Positive side DC power line, 32 Negative side DC power line, 33 First Operation start / stop line, 34 Second operation start / stop line, 35 Charging / discharging connector connection confirmation line, 36 Ground line, 37 CAN Communication line, 37a CAN-H line, 37b CAN-L line, 100 second connection detector, 100a second connection detection signal, 104 FET, 105 diode, 106, 107 amplifier, 108 switch circuit, 108a on / off signal, 110 constant current circuit, 200 OR gate, 201 AND gate.

Claims (5)

An electric power supply system having a charger / discharger for transferring electric power via a storage battery and a charge / discharge connector of an electric vehicle,
A first connection detector for detecting a connection state of the charge / discharge connector;
A CAN circuit for performing data communication according to a CAN communication protocol between the power supply system and the electric vehicle;
A second connection detector for measuring a termination resistance value of a CAN communication line connected to the CAN circuit;
Using the first connection detection signal output from the first connection detector, the second connection detection signal output from the second connection detector, and the data communication data, the connection of the charge / discharge connector is performed. A power supply system comprising: a control unit that performs presence / absence determination and control of the charger / discharger. The second connection detector is
A switch circuit for switching between electrical connection and non-connection between the second connection detector and the CAN circuit;
A termination resistance measuring unit for measuring a termination resistance value of the CAN communication line,
The power supply system according to claim 1, wherein the control unit connects the switch circuit when measuring the termination resistance value, and disconnects the switch circuit when the termination resistance value is not measured.   The power supply system according to claim 2, wherein the switch circuit uses a field effect transistor. A display operation unit for displaying and operating the state of the power supply system;
The said control part can display the connection state of the said charging / discharging connector on the said display operation part also in the standby before the said electric power supply system starts charging / discharging. 4. The power supply system according to any one of 3. A display operation unit for displaying and operating the state of the power supply system;
When the charge / discharge connector changes from a non-connected state to a connected state during standby before the power supply system starts charging / discharging, the control unit is configured to indicate the start and end of charge / discharge operation to the electric vehicle. The start / stop signal is output, the information on the storage battery is acquired by the data communication, and the information on the storage battery can be displayed on the display operation unit. The power supply system according to item.

Images