JP7110682B2 - power supply - Google Patents

Description

The present invention relates to a power supply device.

Conventionally, as this type of technology, there is a power failure backup system comprising a vehicle having a storage battery and a power supply port connected to it, and a house having a home power supply and a power line for connecting this to the power supply port of the vehicle. It has been proposed (see Patent Document 1, for example). In this system, the residential power supply is connected to the power supply port (storage battery) of the vehicle by a power line, and the storage battery is charged with the power of the residential power supply, and the power of the storage battery is supplied to the residential power supply in the event of a power failure. or

WO2011/045925

When an external power receiving device that is used infrequently is used instead of the home power supply device, the external power receiving device may not have an operating power supply such as an auxiliary battery. In this case, it is conceivable that power is supplied to the external power receiving device from the auxiliary battery of the vehicle (supply of power for operation) while power is supplied from the storage battery of the vehicle to the external power receiving device. However, when the voltage of the auxiliary battery drops, power cannot be supplied from the auxiliary battery to the external power receiving device, and the external power receiving device stops operating.

A main object of the power supply device of the present invention is to ensure power supply from a vehicle to an external power receiving device.

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

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 lower rated voltage than the first power storage device;
a DC/DC converter capable of stepping down power in a first power line to which the first power storage device is connected and supplying the power to a second power line to which the second power storage device is connected;
a vehicle-side connection portion for connecting the first power line and the second power line to an external-side connection portion from an external power receiving device;
When power is supplied from the second power storage device to the external power receiving device through the second power line in a state where the vehicle-side connection portion and the external side connection portion are connected, the a control device that enables power supply from the first power storage device to the external power receiving device through the first power line when the vehicle instructs to supply power to the external power receiving device;
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 vehicle issues an instruction to supply power to the external power receiving device, the voltage of the second power storage device reaches a predetermined level. When the voltage becomes lower than 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, restarting power supply from the second power storage device to the external power receiving device;
This is the gist of it.

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 through the second power line in a state in which the vehicle side connection portion and the external side connection portion are connected. In addition, when the vehicle instructs to supply power to the external power receiving device, the power can be supplied from the first power storage device to the external power receiving device via the first power line. Then, when the voltage of the second power storage device reaches the predetermined voltage or less while power is being supplied from the second power storage device to the external power receiving device and before the vehicle issues an instruction to supply power to the external power receiving device, the second power storage device 2 Stops power supply from the power storage device to the external power receiving device to drive the DC/DC converter, and stops power supply from the second power storage device to the external power receiving device when the voltage of the second power storage device becomes higher than a predetermined voltage. resume. Accordingly, when the vehicle instructs to supply power to the external power receiving device, the power can be supplied more reliably.

In the power supply device of the present invention, a first relay provided closer to the first power storage device than the DC/DC converter 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 on the second power line and the vehicle-side connector. and a relay.

In the power supply device of the aspect of the present invention including a first relay, a second relay, and a third relay, the control device controls the third relay when the vehicle-side connection portion and the external-side connection portion are connected to each other. is turned on, power is supplied from the second power storage device to the external power receiving device. Further, the control device may turn on the first relay and the second relay so that power can be supplied from the first power storage device to the external power receiving device. Further, the control device controls the voltage of the second power storage device while power is being supplied from the second power storage device to the external power receiving device and before the vehicle instructs to supply power to the external power receiving device. reaches the predetermined voltage or less, the third relay is turned off to stop the supply of power from the second power storage device to the external power receiving device, the first relay is turned on, and then the DC /DC converter is driven, and when the voltage of the second power storage device becomes higher than the predetermined voltage, the third relay is turned on again to stop power supply from the second power storage device to the external power receiving device. It may be restarted.

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 vehicle instructs to supply power to the external power receiving device. good. By doing so, it is possible to suppress the voltage drop of the second power storage device when power is being supplied from the vehicle to the external power receiving device.

1 is a configuration diagram showing a schematic configuration of an electric vehicle 20 equipped with a power supply device according to an embodiment of the present invention; FIG. 4 is a flowchart showing an example of a processing routine executed by a main ECU 60;

Next, a mode for carrying out the present invention will be described using examples.

FIG. 1 is a configuration diagram showing the outline of the configuration of an electric vehicle 20 equipped with a power supply device as one 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 running relay SMR, an auxiliary battery 40 as a second power storage device, A DC/DC converter 42, a vehicle-side connector 44 as a vehicle-side connection portion, a charging relay DCR, a power supply relay PWR, a charging electronic control unit (hereinafter referred to as "charging ECU") 50, and a main electronic 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 22a and 22b via a differential gear 24. As shown in FIG. 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 the 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 nickel-hydrogen secondary battery with a rated voltage of 200 V, 230 V, or 250 V, for example, and is connected to the high-voltage side power line 38 .

Auxiliary battery 40 is configured as a lead-acid battery with a rated voltage of 12 V, for example, and is connected to low-voltage side power line 39 . The charging ECU 50, the main ECU 60, and the like are also connected to the low-voltage side power line 39. As shown in FIG.

The DC/DC converter 42 is connected to the high-voltage power line 38 and the low-voltage power line 39, and is controlled by the main ECU 60 to step down the power of the high-voltage power line 38 and convert it to low-voltage power. feed line 39;

The vehicle-side connector 44 is configured to connect the high-voltage power line 38 and the low-voltage power line 39 to an external connector 92 as an external connection portion 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 power equipment (for example, household appliances, etc.) in a house or the like. Moreover, in the embodiment, the external power receiving device 90 is not provided with 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 power line 38 , and is ON/OFF controlled by the main ECU 60 .

Charging relay DCR is provided between inverter 34 and DC/DC converter 42 side of system main relay SMR in high-voltage power line 38 and vehicle-side connector 44 , and is ON/OFF controlled by charging ECU 50 .

Power supply relay PWR is provided between auxiliary battery 40 or DC/DC converter 42 and vehicle-side connector 44 in low-voltage power line 39 , and is ON/OFF controlled by charge 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 for storing processing programs, a RAM for temporarily storing data, an input/output port, and a communication port. Prepare. A connection detection signal or the like from a connection detection sensor 44a attached to the vehicle-side connector 44 and detecting connection between the vehicle-side connector 44 and the external connector 92 is input to the charging ECU 50 via an input port.

A control signal to the charging relay DCR, a control signal to the power supply relay PWR, and the like are output from the charging ECU 50 through the output port. Charging ECU 50 is communicably connected to main ECU 60 via a communication line. Further, 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 through input ports. Signals input to the main ECU 60 include, for example, the 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 the voltage applied between the 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 voltage sensor 40a attached between the terminals of the auxiliary battery 40. A voltage Vb2 of the machine battery 40 can be mentioned. In addition, 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 through an output port. Signals output from the main ECU 60 include, for example, 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 power 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 power storage ratio SOC is the ratio of the capacity (power amount) of electric power that can be discharged from the main battery 36 to the total capacity of the main battery 36 . Main ECU 60 is communicably connected to charging ECU 50 via a communication line, as described above.

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

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

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

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

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

When it is determined in step S110 that the electric vehicle 20 is instructed to supply power to the external power receiving device 90 while the processes of steps S110 to S130 are being 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 become equal to or lower than the threshold value Vb2ref after the start of execution of this routine. A value of 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 DC/DC converter 42 is started to be driven (step S210), and the ON command of the charging relay DCR is charged. It is transmitted to the ECU 50 (step S220), and the routine ends. When the charge ECU 50 receives the command to turn on the charging relay DCR, the charging ECU 50 turns on the charging relay DCR.

When system main relay SMR and charging relay DCR are turned on, power can be supplied from main battery 36 to external power receiving device 90 via high voltage side power line 38 , vehicle side connector 44 and external side connector 92 . In this manner, electric power can be supplied from the electric vehicle 20 (main battery 36) to the external power receiving device 90. FIG. At this time, DC/DC converter 42 is driven so that voltage Vb2 of auxiliary battery 40 becomes a target voltage (for example, rated voltage) higher than threshold Vb2ref. As a result, voltage Vb2 of auxiliary battery 40 can be prevented from dropping below threshold Vb2ref while power is being supplied from main battery 36 to external power receiving device 90 .

When the voltage Vb2 of the auxiliary battery 40 is equal to or lower than the threshold value Vb2ref in step S130 while the processes of steps S110 to S130 are being repeatedly executed, sufficient electric power for operation of the electric vehicle 20 and the external power receiving device 90 cannot be secured. It determines that there is a possibility, sets the voltage drop history flag F to a value of 1 (step S135), and transmits a command to turn off the power supply relay PWR to the charging ECU 50 (step S140). When charging ECU 50 receives the instruction to turn off power supply relay PWR, charging ECU 50 turns off power supply relay PWR. As a result, power supply from auxiliary battery 40 to 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, DC/DC converter 42 is driven so that voltage Vb2 of auxiliary battery 40 becomes a target voltage (for example, rated voltage) higher than threshold Vb2ref. As a result, power from the main battery 36 is supplied to the auxiliary battery 40 via the high-voltage power line 38, the DC/DC converter 42, and the low-voltage power line 39, and the voltage Vb2 of the auxiliary battery 40 rises. .

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

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

After that, when it is determined in step S110 that an instruction to supply power from the electric vehicle 20 to the external power receiving device 90 is given, 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). A command to turn on the relay DCR is transmitted to the charging ECU 50 (step S220), and this routine ends. In this way, when the electric vehicle 20 instructs the external power receiving device 90 to supply power, the power can be supplied more reliably. When the electric vehicle 20 instructs to supply power to the external power receiving device 90 while the voltage Vb2 of the auxiliary battery 40 is equal to or less than the threshold Vb2ref (while the power supply relay PWR is off), the voltage Vb2 of the auxiliary battery 40 becomes 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.

The processing of steps S170 to S190 is repeatedly executed, and when it is determined in step S190 that the predetermined time has passed since the start of driving the DC/DC converter 42, this routine ends. In this case, it is determined that the possibility of not being able to secure sufficient operating power for electric vehicle 20 and external power receiving device 90 will not be resolved, and power supply from electric vehicle 20 to 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 to supply power from the auxiliary battery 40 to the external power receiving device 90 . When the electric vehicle 20 instructs to supply power to the external power receiving device 90, the system main relay SMR and the charging relay DCR are turned on to allow power to be supplied from the main battery 36 to the external power receiving device 90. to Then, while power is being supplied from auxiliary battery 40 to external power receiving device 90 and before electric vehicle 20 instructs external power receiving device 90 to supply power, voltage Vb2 of auxiliary battery 40 falls below threshold value Vb2ref. When the power supply relay PWR is turned off, power supply from the auxiliary battery 40 to the external power receiving device 90 is stopped, the system main relay SMR is turned on, the DC/DC converter 42 is driven, and the auxiliary battery When the voltage Vb2 of 40 becomes higher than the threshold value Vb2ref, the power supply relay PWR is turned on to resume power supply from the auxiliary battery 40 to the external power receiving device 90 . As a result, when the electric vehicle 20 instructs to supply power to the external power receiving device 90, the power can be supplied more reliably.

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 DC/DC converter 42 starts to be driven (steps S140 to S160), when the voltage Vb2 of the auxiliary battery 40 becomes higher than the threshold Vb2ref in step S180, the system main relay SMR is kept ON and the DC/DC converter is turned on. 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 driving of the DC/DC converter 42 is stopped, the system main relay SMR is turned off, and the power supply relay PWR is turned on. may be

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

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

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

The correspondence relationship between the main elements of the embodiments 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 Side connector 44 corresponds to the "vehicle side connection portion", and charging ECU 50 and main ECU 60 correspond to the "control device".

Note that the correspondence relationship between the main elements of the examples and the main elements of the invention described in the column of Means for Solving the Problems is the Since it is an example for specifically explaining the mode for solving the problem, it does not limit the elements of the invention described in the column of the means for solving the problem. That is, the interpretation of the invention described in the column of Means to Solve the Problem should be made based on the description in that column, and the Examples are based on the description of the invention described in the column of Means to Solve the Problem. This is only a specific example.

Although the embodiments for carrying out the present invention have been described above, the present invention is not limited to such embodiments at all, and can be modified in various forms without departing from the scope of the present invention. Of course, it can be implemented.

INDUSTRIAL APPLICABILITY The present invention is applicable to the power supply manufacturing industry and the like.

20 electric vehicle, 22a, 22b drive wheels, 24 differential gear, 26 drive shaft, 32 motor, 34 inverter, 36 main battery, 36a voltage sensor, 36b current sensor, 38 high-voltage power line, 39 low-voltage 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 receiving device , 92 external connectors.

Claims (1)

mounted on the vehicle
a first power storage device;
a second power storage device having a lower rated voltage than the first power storage device;
a DC/DC converter capable of stepping down power in a first power line to which the first power storage device is connected and supplying the power to a second power line to which the second power storage device is connected;
a vehicle-side connection portion for connecting the first power line and the second power line to an external-side connection portion from an external power receiving device;
When the vehicle-side connection portion and the external-side connection portion are connected , power can be supplied from the second power storage device to the external power receiving device via the second power line, and the second power storage device When power is supplied from the first power storage device to the external power receiving device through the second power line and an instruction to supply power from the first power storage device to the external power receiving device is given based on a switch operation, the a control device that enables power supply from a first power storage device to the external power receiving device via the first power line;
A power supply device comprising:
When power is being supplied from the second power storage device to the external power receiving device and before an instruction to supply power from the first power storage device to the external power receiving device is given, the control device controls the power supply to the external power receiving device. 2 When the voltage of the power storage device reaches a predetermined voltage or less, the power supply from the second power storage device to the external power receiving device is stopped so that the voltage of the second power storage device becomes higher than the predetermined voltage. When the DC/DC converter is driven and the voltage of the second power storage device becomes higher than the predetermined voltage, power supply from the second power storage device to the external power receiving device is resumed;
Power supply.

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