Vehicle having power storage devices and charging line for supplying electric power provided from outside vehicle
A vehicle ( 1 ) includes a plurality of chargeable and dischargeable batteries (B 1 , B 2 ), a load device, a bus for supplying electric power to the load device, a plurality of voltage step-up converters ( 12 - 1, 12 - 2 ) provided in association with a plurality of batteries (B 1 , B 2 ) respectively, a charging line (PCL) for supplying electric power provided from outside the vehicle to a connection point of the first battery (B 1 ) and the first voltage step-up converter ( 12 - 1 ), and a control device ( 30 ). When charging from an external source is started, the control device ( 30 ) causes the first voltage step-up converter ( 12 - 1 ) to perform a rectifying operation for supplying electric current from the charging line to the bus in a case where a voltage of the bus is lower than a voltage of the charging line, and causes the first voltage step-up converter ( 12 - 2 ) to connect the bus and the second battery (B 2 ).
1. A vehicle comprising:
a first chargeable and dischargeable power storage device;
a second chargeable and dischargeable power storage device;
a load device;
an electric power line, the electric power line supplying an electric power to the load device;
a first voltage conversion device and a second voltage conversion device, the first and the second voltage conversion devices being provided in association with the first and the second power storage devices respectively and each connected between respective associated power storage device and the electric power line;
a charging line, the charging line supplying an electric power provided from outside the vehicle to a connection point of the first power storage device and the first voltage conversion device; and
a control device, the control device controlling the first voltage conversion device and the second voltage conversion device, wherein
while external charging from an external source via the charging line is performed, when a voltage of the electric power line is lower than a voltage of the charging line, the control device causes the first voltage conversion device to perform a rectifying operation for supplying an electric current from the charging line to the electric power line, and causes the second voltage conversion device to connect the electric power line and the second power storage device.
2. The vehicle according to claim 1 , wherein
each of the first voltage conversion device and the second voltage conversion device includes a chopper circuit having an upper arm where a switching element and a rectifying element are connected in parallel,
while the external charging is performed, the control device fixes the switching element in the first voltage conversion device in a non-conductive state and fixes the switching element in the second voltage conversion device in a conductive state.
3. The vehicle according to claim 2 , wherein
the electric power line includes a positive bus and a negative bus, and
the chopper circuit further includes:
an inductor having one end connected to a positive electrode of the associated power storage device; and
a lower arm connected between the other end of the inductor and the negative bus,
the upper arm is connected between the other end of the inductor and the positive bus, and
the rectifying element has a forward direction from the other end of the inductor toward the positive bus, and the rectifying element is provided in parallel with the switching element.
4. The vehicle according to claim 1 , wherein
when a state amount indicating a state of charge of the first power storage device is closer to a full charge state relative to a first predetermined value while the external charging is performed, the control device causes the second voltage conversion device to operate such that a state amount indicating a state of charge of the second power storage device increases.
5. The vehicle according to claim 4 , wherein
when the state amount indicating the state of charge of at least one of the first and second power storage devices is closer to the full charge state relative to a second predetermined value while the external charging is performed, the control device causes the first and second voltage conversion devices to operate together such that the states of the first and second power storage devices are equal to each other, and
the second predetermined value indicates a state amount closer to the full charge state relative to the first predetermined value.
6. The vehicle according to claim 1 , wherein
the load device includes an electric motor used for driving the vehicle, and
the vehicle further comprises an internal combustion engine used together with the electric motor for driving the vehicle.
7. The vehicle according to claim 6 , further comprising a charger configured to be connectable to a power supply outside the vehicle and converting electric power received from the power supply to generate a charging voltage on the charging line.