JP2019186975A - Power supply device - Google Patents

Abstract

To more reliably supply power from a vehicle to an external power reception device.SOLUTION: In a state that a vehicle side connection is connected with an external connection, when an external power reception device is powered by a second power storage device via a second power line, if it is instructed to supply power from the vehicle to the external power reception device, the external power reception device is powered from a first power storage device via a first power line. Also, the external power reception device is being powered from the second power storage device and before it is instructed to supply power from the vehicle to the external power reception device, if the voltage of the second power storage device reaches a prescribed voltage or lower, the second power storage device stops to power the external power reception device to drive a DC/DC converter, and if the voltage of the second power storage device is made higher than the prescribed voltage, the second power storage device resumes to power the external power reception device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply device.

  Conventionally, as this type of technology, there is a power outage backup system including a storage battery and a vehicle having a power supply port connected thereto, and a house power supply device and a house having a power line for connecting the power supply port to the vehicle power supply port. It has been proposed (see, for example, Patent Document 1). In this system, the housing power supply is connected to the vehicle power supply port (storage battery) via a power line, and the storage battery power is charged to the storage battery, or the storage battery power is supplied to the housing power supply during a power failure. Or

International Publication No. 2011/045925

  When an external power receiving device that is not frequently used is used in place of the house power source device, the external power receiving device may not include an operating power source such as an auxiliary battery. At this time, it is conceivable that power is supplied from the storage battery of the vehicle to the external power receiving device while power is supplied from the auxiliary battery of the vehicle to the external power receiving device. However, when the voltage of the auxiliary battery decreases, it may not be possible to supply power from the auxiliary battery to the external power receiving device, the external power receiving device stops operating, and power may not be supplied from the storage battery to the external power receiving device.

  The main object of the power supply device of the present invention is to enable more reliable power supply from the vehicle to the external power receiving device.

  The power supply apparatus of the present invention employs the following means in order to achieve the main object described above.

The power supply device of the present invention is
Mounted on the vehicle,
A first power storage device;
A second power storage device having a rated voltage lower than that of the first power storage device;
A DC / DC converter capable of stepping down the power of the first power line to which the first power storage device is connected and supplying it to the second power line to which the second power storage device is connected;
A vehicle side connection part for connecting the first power line and the second power line to an external side connection part from an external power receiving device;
When power is supplied from the second power storage device to the external power receiving device via the second power line in a state where the vehicle side connection portion and the external side connection portion are connected, A control device that enables power supply from the first power storage device to the external power receiving device via the first power line when power supply from the vehicle to the external power receiving device is instructed;
A power supply device comprising:
The control device supplies power from the second power storage device to the external power receiving device, and before the power supply from the vehicle to the external power receiving device is instructed, a voltage of the second power storage device is predetermined. When the voltage reaches below the voltage, the power supply from the second power storage device to the external power receiving device is stopped to drive the DC / DC converter, and when the voltage of the second power storage device becomes higher than the predetermined voltage, Resuming power supply from the second power storage device to the external power receiving device;
This is the gist.

  In the power supply device of the present invention, when power is supplied from the second power storage device to the external power receiving device via the second power line in a state where the vehicle side connection portion and the external side connection portion are connected. In addition, when power supply from the vehicle to the external power receiving device is instructed, power can be supplied from the first power storage device to the external power receiving device via the first power line. Then, when power is supplied from the second power storage device to the external power receiving device and power supply from the vehicle to the external power receiving device is instructed, the voltage of the second power storage device reaches a predetermined voltage or lower. 2 When power supply from the power storage device to the external power receiving device is stopped and the DC / DC converter is driven and the voltage of the second power storage device becomes higher than a predetermined voltage, power supply from the second power storage device to the external power receiving device is stopped. Resume. Thereby, when the power supply from the vehicle to the external power receiving apparatus is instructed, the power supply can be performed more reliably.

  In the power supply device of the present invention, the first relay provided on the first power storage device side with respect to the DC / DC converter in the first power line, and the DC / DC than the first relay in the first power line. A second relay provided between the DC converter side and the vehicle side connector, and a third relay provided between the DC / DC converter and the auxiliary battery and the vehicle side connector in the second power line. And a relay.

  In the power supply device according to the aspect of the invention including the first relay, the second relay, and the third relay, the control device is configured such that when the vehicle-side connection portion and the external-side connection portion are connected, the third relay By turning on, power may be supplied from the second power storage device to the external power receiving device. The control device may be configured to enable power supply from the first power storage device to the external power receiving device by turning on the first relay and the second relay. Further, the control device supplies power from the second power storage device to the external power receiving device and before the power supply from the vehicle to the external power receiving device is instructed, the voltage of the second power storage device When the voltage reaches the predetermined voltage or lower, the third relay is turned off to stop the power supply from the second power storage device to the external power receiving device, and after the first relay is turned on, the DC relay When the / DC converter is driven and the voltage of the second power storage device becomes higher than the predetermined voltage, the third relay is turned on again, thereby supplying power from the second power storage device to the external power receiving device. It may be resumed.

  In the power supply device of the present invention, the control device may drive the DC / DC converter regardless of the voltage of the second power storage device when the power supply from the vehicle to the external power receiving device is instructed. Good. By so doing, it is possible to suppress a decrease in the voltage of the second power storage device when power is supplied from the vehicle to the external power receiving device.

It is a block diagram which shows the outline of a structure of the electric vehicle 20 carrying the power supply device as one Example of this invention. 3 is a flowchart showing an example of a processing routine executed by a main ECU 60.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an electric vehicle 20 equipped with a power supply device as an embodiment of the present invention. As illustrated, the electric vehicle 20 of the embodiment includes a motor 32, an inverter 34, a main battery 36 as a first power storage device, a traveling relay SMR, and an auxiliary battery 40 as a second power storage device. DC / DC converter 42, vehicle-side connector 44 as a vehicle-side connecting portion, charging relay DCR, power supply relay PWR, charging electronic control unit (hereinafter referred to as “charging ECU”) 50, main electronics And a control unit (hereinafter referred to as “main ECU”) 60.

  The motor 32 is configured as, for example, a synchronous generator motor, and is connected to a drive shaft 26 that is coupled to the drive wheels 22 a and 22 b via a differential gear 24. The inverter 34 is used to drive the motor 32 and is connected to the high voltage side power line 38. The motor 32 is rotationally driven by switching control of a plurality of switching elements (not shown) of the inverter 34 by the main ECU 60.

  The main battery 36 is configured as a lithium ion secondary battery or a nickel hydride secondary battery having a rated voltage of 200 V, 230 V, 250 V, etc., for example, and is connected to a high voltage side power line 38.

  The auxiliary battery 40 is configured as a lead storage battery having a rated voltage of 12 V, for example, and is connected to the low voltage side power line 39. A charging ECU 50, a main ECU 60, and the like are also connected to the low voltage side power line 39.

  The DC / DC converter 42 is connected to the high voltage side power line 38 and the low voltage side power line 39, and is controlled by the main ECU 60 to step down the power of the high voltage side power line 38 and thereby reduce the low voltage side power. Supply to line 39.

  The vehicle-side connector 44 is configured to be able to connect the high-voltage side power line 38 and the low-voltage side power line 39 to an external connector 92 as an external connection part from the external power receiving device 90. The external power receiving device 90 is configured to be able to supply power from the electric vehicle 20 to a power device such as a house (for example, a home appliance). In the embodiment, the external power receiving device 90 does not include an operating power source such as an auxiliary battery.

  The system main relay SMR is provided closer to the main battery 36 than the inverter 34 and the DC / DC converter 42 in the high voltage side power line 38, and is on / off controlled by the main ECU 60.

  The charging relay DCR is provided between the inverter 34 and the DC / DC converter 42 side and the vehicle side connector 44 with respect to the system main relay SMR in the high voltage side power line 38 and is on / off controlled by the charging ECU 50.

  The power supply relay PWR is provided between the auxiliary battery 40 and the DC / DC converter 42 in the low voltage side power line 39 and the vehicle side connector 44, and is on / off controlled by the charging ECU 50.

  Although not shown, the charging ECU 50 is configured as a microprocessor centered on a CPU. In addition to the CPU, the charging ECU 50 includes a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port. Prepare. A connection detection signal from a connection detection sensor 44a that is attached to the vehicle side connector 44 and detects the connection between the vehicle side connector 44 and the external side connector 92 is input to the charging ECU 50 via an input port.

  From the charging ECU 50, a control signal to the charging relay DCR, a control signal to the power relay PWR, and the like are output via the output port. The charging ECU 50 is communicably connected to the main ECU 60 via a communication line. Charging ECU 50 is communicably connected to external power receiving device 90 via a communication line when vehicle-side connector 44 and external-side connector 92 are connected.

  Although not shown, the main ECU 60 is configured as a microprocessor centered on a CPU. In addition to the CPU, the main ECU 60 includes a ROM for storing processing programs, a RAM for temporarily storing data, an input / output port, and a communication port. Prepare. Signals from various sensors are input to the main ECU 60 via input ports. Examples of the signal input to the main ECU 60 include a rotational position θm of the rotor of the motor 32 from a rotational position sensor that detects the rotational position of the rotor of the motor 32, and a voltage attached between terminals of the main battery 36. The voltage Vb1 of the main battery 36 from the sensor 36a, the current Ib1 of the main battery 36 from the current sensor 36b attached to the output terminal of the main battery 36, and the auxiliary from the voltage sensor 40a attached between the terminals of the auxiliary battery 40. The voltage Vb2 of the machine battery 40 can be given. Further, the ignition signal from the ignition switch, the shift position from the shift position sensor, the accelerator opening from the accelerator pedal position sensor, the brake pedal position from the brake pedal position sensor, and the vehicle speed from the vehicle speed sensor can also be mentioned.

  Various control signals are output from the main ECU 60 via an output port. Examples of the signal output from the main ECU 60 include a control signal to the inverter 34, a control signal to the system main relay SMR, and a control signal to the DC / DC converter 42. The main ECU 60 calculates the storage ratio SOC of the main battery 36 based on the integrated value of the current Ib1 of the main battery 36 from the current sensor 36b. The storage ratio SOC is a ratio of the capacity (power amount) of power that can be discharged from the main battery 36 to the total capacity of the main battery 36. As described above, the main ECU 60 is communicably connected to the charging ECU 50 via the communication line.

  The “power supply device” in the embodiment mainly corresponds to the main battery 36, the auxiliary battery 40, the DC / DC converter 42, the vehicle side connector 44, the charging ECU 50, and the main ECU 60.

  Next, the operation of the power supply device mounted on the electric vehicle 20 of the embodiment thus configured, particularly when the vehicle-side connector 44 of the electric vehicle 20 and the external-side connector 92 from the external power receiving device 90 are connected. The operation will be described. FIG. 2 is a flowchart showing an example of a processing routine executed by the main ECU 60. This routine is executed when the vehicle-side connector 44 and the external-side connector 92 are connected (when a connection detection signal from the connection detection sensor 44a is received via the charging ECU 50). At the start of execution of this routine, system main relay SMR, charging relay DCR, and power supply relay PWR are all off, and driving of DC / DC converter 42 is stopped.

  When the processing routine of FIG. 2 is executed, the main ECU 60 transmits an on command for the power supply relay PWR to the charging ECU 50 (step S100). When the charging ECU 50 receives an ON command for the power supply relay PWR, the charging ECU 50 turns on the power supply relay PWR. As a result, power is supplied from the auxiliary battery 40 to the external power receiving device 90 (supply of operating power) via the low voltage side power line 39, the vehicle side connector 44, and the external side connector 92.

  Subsequently, it is determined whether power supply from the electric vehicle 20 to the external power receiving device 90 is instructed (step S110). This determination process is performed, for example, by examining whether or not an operation signal of a power supply start switch (not shown) provided in the external power receiving device 90 is received from the external power receiving device 90 via the charging ECU 50.

  When it is determined in step S110 that power supply from the electric vehicle 20 to the external power receiving device 90 is not instructed, the voltage Vb2 of the auxiliary battery 40 from the voltage sensor 40a is input (step S120), and the input auxiliary battery 40 is input. The voltage Vb2 is compared with the threshold value Vb2ref (step S130). Here, the threshold value Vb2ref is a threshold value used to determine whether or not sufficient electric power for operation of the electric vehicle 20 (such as the charging ECU 50 and the main ECU 60) and the external power receiving device 90 can be secured. 10.2V, 10.5V, etc. are used. If the voltage Vb2 of the auxiliary battery 40 is higher than the threshold value Vb2ref in step S120, it is determined that sufficient power for operation of the electric vehicle 20 and the external power receiving device 90 can be secured, and the process returns to step S110.

  If it is determined that power supply from the electric vehicle 20 to the external power receiving device 90 is instructed in step S110 while the processes of steps S110 to S130 are repeatedly executed, the value of the voltage drop history flag F is checked (step S195). Here, the voltage drop history flag F is a flag indicating whether or not there is a history that the voltage Vb2 of the auxiliary battery 40 has reached the threshold value Vb2ref or less after the execution of this routine is started. The value 0 is set.

  When the voltage drop history flag F is 0 in step S195, the system main relay SMR is turned on (step S200), the driving of the DC / DC converter 42 is started (step S210), and the charging relay DCR on command is charged. It transmits to ECU50 (step S220), and this routine is complete | finished. When the charging ECU 50 receives a command to turn on the charging relay DCR, the charging ECU 50 turns on the charging relay DCR.

  When the system main relay SMR and the charging relay DCR are turned on, power can be supplied from the main battery 36 to the external power receiving device 90 via the high voltage side power line 38, the vehicle side connector 44, and the external side connector 92. In this way, power can be supplied from the electric vehicle 20 (main battery 36) to the external power receiving device 90. At this time, the DC / DC converter 42 is driven so that the voltage Vb2 of the auxiliary battery 40 becomes a target voltage (for example, a rated voltage) higher than the threshold value Vb2ref. Thereby, it is possible to suppress the voltage Vb2 of the auxiliary battery 40 from being lowered to the threshold value Vb2ref or lower during power feeding from the main battery 36 to the external power receiving device 90.

  When the processing of steps S110 to S130 is repeatedly executed, if the voltage Vb2 of the auxiliary battery 40 is equal to or lower than the threshold value Vb2ref in step S130, sufficient power for operation of the electric vehicle 20 and the external power receiving device 90 cannot be secured. It is determined that there is a possibility, a value 1 is set in the voltage drop history flag F (step S135), and an off command for the power supply relay PWR is transmitted to the charging ECU 50 (step S140). When the charging ECU 50 receives an instruction to turn off the power supply relay PWR, the charging ECU 50 turns off the power supply relay PWR. Thereby, the power supply from the auxiliary battery 40 to the external power receiving device 90 is stopped.

  Subsequently, the system main relay SMR is turned on (step S150), and then the driving of the DC / DC converter 42 is started (step S160). At this time, the DC / DC converter 42 is driven so that the voltage Vb2 of the auxiliary battery 40 becomes a target voltage (for example, a rated voltage) higher than the threshold value Vb2ref. As a result, power from the main battery 36 is supplied to the auxiliary battery 40 via the high voltage side power line 38, the DC / DC converter 42, and the low voltage side power line 39, and the voltage Vb2 of the auxiliary battery 40 increases. .

  Then, voltage Vb2 of auxiliary battery 40 from voltage sensor 40a is input (step S170), and input voltage Vb2 of auxiliary battery 40 is compared with threshold value Vb2ref (step S180). When voltage Vb2 of auxiliary battery 40 is equal to or lower than threshold value Vb2ref, it is determined whether or not a predetermined time has elapsed since the start of driving of DC / DC converter 42 (step S190), and it is determined that the predetermined time has not elapsed. If so, the process returns to step S170.

  When the processes of steps S170 to S190 are repeatedly executed and the voltage Vb2 of the auxiliary battery 40 becomes higher than the threshold value Vb2ref in step S180, the process returns to step S100. When power supply relay PWR is turned on again in this way, power supply from auxiliary battery 40 to external power receiving device 90 is resumed.

  Thereafter, when it is determined in step S110 that power supply from the electric vehicle 20 to the external power receiving device 90 is instructed, the value of the voltage drop history flag F is checked (step S195). When the voltage drop flag F is 1, the system main relay SMR is on and the DC / DC converter 42 is being driven (see steps S150 and S160), so that charging is performed without executing the processing of steps S200 and S210. The relay DCR ON command is transmitted to the charging ECU 50 (step S220), and this routine is terminated. In this way, when power supply from the electric vehicle 20 to the external power receiving device 90 is instructed, the power supply can be performed more reliably. When power supply from electric vehicle 20 to external power receiving device 90 is instructed while voltage Vb2 of auxiliary battery 40 is equal to or lower than threshold value Vb2ref (while power supply relay PWR is off), voltage Vb2 of auxiliary battery 40 is instructed. Is higher than the threshold value Vb2ref and the power supply relay PWR is turned on again, the processes of steps S110 and S195 to S220 may be executed.

  When the processes of steps S170 to S190 are repeatedly executed and it is determined in step S190 that a predetermined time has elapsed from the start of driving of the DC / DC converter 42, this routine is terminated. In this case, it is determined that there is no possibility that the operation power of the electric vehicle 20 and the external power receiving device 90 cannot be sufficiently secured, and power supply from the electric vehicle 20 to the external power receiving device 90 is prohibited.

  In the power supply device mounted on the electric vehicle 20 of the embodiment described above, when the vehicle-side connector 44 and the external-side connector 92 are connected, the power supply relay PWR is turned on and the external power receiving device 90 is connected from the auxiliary battery 40. When power is supplied from the electric vehicle 20 to the external power receiving device 90, the system main relay SMR and the charging relay DCR are turned on to supply power from the main battery 36 to the external power receiving device 90. To. Then, before power is supplied from the auxiliary battery 40 to the external power receiving device 90 and power supply from the electric vehicle 20 to the external power receiving device 90 is instructed, the voltage Vb2 of the auxiliary battery 40 falls below the threshold value Vb2ref. When the power is reached, the power supply relay PWR is turned off to stop the power supply from the auxiliary battery 40 to the external power receiving device 90, the system main relay SMR is turned on, and then the DC / DC converter 42 is driven. When the voltage Vb2 of 40 becomes higher than the threshold value Vb2ref, the power supply relay PWR is turned on to restart the power supply from the auxiliary battery 40 to the external power receiving device 90. Thereby, when power supply from the electric vehicle 20 to the external power receiving device 90 is instructed, the power supply can be more reliably performed.

  In the power supply device mounted on the electric vehicle 20 of the embodiment, it is determined in step S130 that the voltage Vb2 of the auxiliary battery 40 is equal to or lower than the threshold value Vb2ref, the power supply relay PWR is turned off, and the system main relay SMR is turned on. After the driving of the DC / DC converter 42 is started (steps S140 to S160), when the voltage Vb2 of the auxiliary battery 40 becomes higher than the threshold value Vb2ref in step S180, the system main relay SMR is kept on and the DC / DC While continuing to drive the DC converter 42, the power supply relay PWR is turned on (step S100). However, when the voltage Vb2 of the auxiliary battery 40 becomes higher than the threshold value Vb2ref in step S180, the DC / DC converter 42 is stopped, the system main relay SMR is turned off, and the power supply relay PWR is turned on. It is good.

  Although the power supply device mounted on the electric vehicle 20 according to the embodiment includes the charging ECU 50 and the main ECU 60, they may be configured as one electronic control unit.

  In the power supply device mounted on the electric vehicle 20 according to the embodiment, the main battery 36 is used as the power storage device, but a capacitor may be used instead.

  In the embodiment, the power supply device is mounted on the electric vehicle 20, but the power supply device may be mounted on the hybrid vehicle.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the main battery 36 corresponds to the “first power storage device”, the auxiliary battery 40 corresponds to the “second power storage device”, the DC / DC converter 42 corresponds to the “DC / DC converter”, and the vehicle The side connector 44 corresponds to a “vehicle side connection portion”, and the charging ECU 50 and the main ECU 60 correspond to a “control device”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power supply device manufacturing industry.

  20 electric vehicle, 22a, 22b drive wheel, 24 differential gear, 26 drive shaft, 32 motor, 34 inverter, 36 main battery, 36a voltage sensor, 36b current sensor, 38 high voltage side power line, 39 low voltage side power line, 40 Auxiliary Battery, 40a Voltage Sensor, 42 DC / DC Converter, 44 Vehicle Side Connector, 44a Connection Detection Sensor, 50 Charging Electronic Control Unit (Charging ECU), 60 Main Electronic Control Unit (Main ECU), 90 External Power Receiver , 92 External connector.

Claims (1)

Mounted on the vehicle,
A first power storage device;
A second power storage device having a rated voltage lower than that of the first power storage device;
A DC / DC converter capable of stepping down the power of the first power line to which the first power storage device is connected and supplying it to the second power line to which the second power storage device is connected;
A vehicle side connection part for connecting the first power line and the second power line to an external side connection part from an external power receiving device;
When power is supplied from the second power storage device to the external power receiving device via the second power line in a state where the vehicle side connection portion and the external side connection portion are connected, A control device that enables power supply from the first power storage device to the external power receiving device via the first power line when power supply from the vehicle to the external power receiving device is instructed;
A power supply device comprising:
The control device supplies power from the second power storage device to the external power receiving device, and before the power supply from the vehicle to the external power receiving device is instructed, a voltage of the second power storage device is predetermined. When the voltage reaches below the voltage, the power supply from the second power storage device to the external power receiving device is stopped to drive the DC / DC converter, and when the voltage of the second power storage device becomes higher than the predetermined voltage, Resuming power supply from the second power storage device to the external power receiving device;
Power supply.

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