Electrically powered vehicle and method of controlling charging of electrically powered vehicle
An inter-terminal voltage obtaining unit obtains an inter-terminal voltage of a battery. A comparator compares the inter-terminal voltage with a maximum output voltage of a charger. When relation of VB≤VCmax is satisfied, an AC charging relay is switched such that output electric power from the charger is supplied to a high-voltage side of a buck-boost converter. When relation of VB>VCmax is satisfied, the AC charging relay is switched such that an output voltage of the charger is supplied to a low-voltage side of the buck-boost converter and the buck-boost converter is activated.
1. An electrically powered vehicle, comprising:
a power storage device chargeable with electric power supply supplied from an external power supply;
a voltage sensor configured to detect an inter-terminal voltage of the power storage device;
a booster having a high-voltage side connected to the power storage device, the booster being configured to boost a voltage of electric power provided to a low-voltage side of the booster and to provide electric power of the boosted voltage to the high-voltage side;
a first path through which the electric power supplied from the external power supply is supplied to the high-voltage side of the booster;
a second path through which the electric power supplied from the external power supply is supplied to the low-voltage side of the booster;
a charging relay configured to selectively switch a path for the electric power supplied from the external power supply to the first path or the second path; and
a controller configured to control the charging relay in accordance with the inter-terminal voltage of the power storage device detected by the voltage sensor, wherein
the controller is configured to
control the charging relay to select the first path in response to the power storage device being charged with the electric power supplied from the external power supply and the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a voltage of the electric power supplied from the external power supply, and
switch the charging relay such that the path for the electric power is changed from the first path to the second path, and to activate the booster, in response to the power storage device being charged with the electric power supplied from the external power supply and the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the voltage of the electric power supplied from the external power supply.
2. The electrically powered vehicle according to claim 1 , wherein
the external power supply is an AC power supply configured to supply AC electric power to the electrically powered vehicle,
the electrically powered vehicle further comprises a charger configured to convert the AC electric power supplied from the AC power supply to DC electric power,
the first path is a path through which the DC electric power provided from the charger is supplied to the high-voltage side of the booster,
the second path is a path through which the DC electric power provided from the charger is supplied to the low-voltage side of the booster, and
the controller is configured to
control the charging relay to select the first path in response to the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a voltage of the DC electric power provided from the charger, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the voltage of the DC electric power provided from the charger.
3. The electrically powered vehicle according to claim 2 , wherein
the controller is configured to
control the charging relay to select the first path in response to the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than an upper limit voltage which is an upper limit of the voltage provided from the charger, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the upper limit voltage.
4. The electrically powered vehicle according to claim 1 , wherein
the external power supply is a DC power supply configured to supply DC electric power to the electrically powered vehicle,
the electrically powered vehicle further comprises a DC inlet configured to receive input of the DC electric power supplied from the DC power supply,
the first path is a path through which the DC electric power provided to the DC inlet is supplied to the high-voltage side of the booster,
the second path is a path through which the DC electric power provided to the DC inlet is supplied to the low-voltage side of the booster, and
the controller is configured to
control the charging relay to select the first path in response to the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a voltage of the DC electric power supplied from the DC power supply, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the voltage of the DC electric power supplied from the DC power supply.
5. The electrically powered vehicle according to claim 4 , wherein
the controller is configured to
control the charging relay to select the first path in response to the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a maximum voltage which is maximum of the voltage of the DC electric power supplied from the DC power supply, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the maximum voltage.
6. The electrically powered vehicle according to claim 1 , wherein
the external power supply is an AC power supply configured to supply AC electric power to the electrically powered vehicle or a DC power supply configured to supply DC electric power to the electrically powered vehicle,
the electrically powered vehicle further comprises:
a DC inlet configured to receive input of the DC electric power supplied from the DC power supply;
a first DC path through which the DC electric power provided to the DC inlet is supplied to the high-voltage side of the booster;
a second DC path through which the DC electric power provided to the DC inlet is supplied to the low-voltage side of the booster;
a DC charging relay configured to selectively switch a path for the DC electric power supplied from the DC power supply to the first DC path or the second DC path; and
a charger configured to convert the AC electric power supplied from the AC power supply to DC electric power,
the first path is a path through which the DC electric power provided from the charger is supplied to the high-voltage side of the booster,
the second path is a path through which the DC electric power provided from the charger is supplied to the low-voltage side of the booster,
the controller is configured to
control the DC charging relay to select the first DC path in response to the power storage device being charged with the DC electric power provided to the DC inlet and the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a voltage of the DC electric power supplied from the DC power supply, and
switch the DC charging relay such that the path for the DC electric power is changed from the first DC path to the second DC path, and to activate the booster, in response to the power storage device being charged with the DC electric power provided to the DC inlet and the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the voltage of the DC electric power supplied from the DC power supply, and
the controller is configured to
control the charging relay to select the first path in response to the power storage device being charged with the DC electric power provided from the charger and the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a voltage of the DC electric power provided from the charger, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the power storage device being charged with the DC electric power provided from the charger and the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the voltage of the DC electric power provided from the charger.
7. The electrically powered vehicle according to claim 6 , wherein
the controller is configured to
control the DC charging relay to select the first DC path in response to the power storage device being charged with the DC electric power provided to the DC inlet and the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than a maximum voltage which is maximum of the voltage of the DC electric power supplied from the DC power supply, and
switch the DC charging relay such that the path for the DC electric power is changed from the first DC path to the second DC path, and to activate the booster, in response to the power storage device being charged with the DC electric power provided to the DC inlet and the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the maximum voltage, and
the controller is configured to
control the charging relay to select the first path in response to the power storage device being charged with the DC electric power provided from the charger and the inter-terminal voltage of the power storage device detected by the voltage sensor being lower than an upper limit voltage which is an upper limit of the voltage provided from the charger, and
switch the charging relay such that the path for the DC electric power is changed from the first path to the second path, and to activate the booster, in response to the power storage device being charged with the DC electric power provided from the charger and the inter-terminal voltage of the power storage device detected by the voltage sensor exceeding the upper limit voltage.
8. The electrically powered vehicle according to claim 1 , wherein
the booster is a buck-boost converter, and
the buck-boost converter is configured to
boost the voltage of electric power provided to the low-voltage side and provide the boosted voltage to the high-voltage side, and
lower the voltage of electric power provided to the high-voltage side and provide the lowered voltage to the low-voltage side.
9. The electrically powered vehicle according to claim 8 , further comprising
auxiliary machinery connected to the low-voltage side of the buck-boost converter.
10. A method of controlling charging of an electrically powered vehicle,
the electrically powered vehicle including
a charger that converts AC electric power supplied from an external power supply to DC electric power,
a power storage device chargeable with the DC electric power provided from the charger,
a voltage sensor that detects an inter-terminal voltage of the power storage device,
a booster, the booster having a high-voltage side connected to the power storage device, the booster being configured to boost a voltage of the DC electric power provided to a low-voltage side of the booster and to provide the DC electric power of the boosted voltage to the high-voltage side,
a first path through which the DC electric power provided from the charger is supplied to the high-voltage side of the booster,
a second path through which the DC electric power provided from the charger is supplied to the low-voltage side of the booster, and
a charging relay that selectively switches a path for the DC electric power provided from the charger to the first path or the second path,
the method comprising:
obtaining the inter-terminal voltage of the power storage device detected by the voltage sensor during an operation of the charger;
comparing an upper limit voltage which is an upper limit of a voltage provided from the charger with the inter-terminal voltage detected by the voltage sensor during the operation of the charger;
charging the power storage device by controlling the charging relay to select the first path without activation of the booster in response to the inter-terminal voltage detected by the voltage sensor during the operation of the charger being lower than the upper limit voltage; and
charging the power storage device by switching the charging relay such that the path for the DC electric power is changed from the first path to the second path, and activating the booster, in response to the inter-terminal voltage detected by the voltage sensor during the operation of the charger exceeding the upper limit voltage.