Vehicle charging system and electrically powered vehicle provided with the same
An AC/DC converter is configured to perform voltage conversion on power supplied from an AC power supply and supply the power to an auxiliary load during external charging in which a main power storage device is charged by the AC power supply. An auxiliary power storage device stores power to be supplied to the auxiliary load. A diode permits discharging of the auxiliary power storage device while preventing charging of the auxiliary power storage device during the external charging. A current sensor detects discharging of the auxiliary power storage device. A controller adjusts an output voltage of the AC/DC converter while confirming whether or not the auxiliary power storage device discharges, based on a detection value of the current sensor.
1. A vehicle charging system configured to be capable of charging a power storage device mounted in a vehicle by an external power supply external to the vehicle, comprising:
a converter configured to perform voltage conversion on power supplied from said external power supply and supply the power to an auxiliary load during external charging in which said power storage device is charged by said external power supply;
an auxiliary power supply storing power to be supplied to said auxiliary load;
a diode for permitting discharging of said auxiliary power supply while preventing charging of said auxiliary power supply during said external charging;
a current sensor for detecting discharging of said auxiliary power supply; and
a control device for adjusting an output voltage of said converter while confirming whether or not said auxiliary power supply discharges, based on a detection value of said current sensor.
2. The vehicle charging system according to claim 1 , wherein, if the detection value of said current sensor is zero, said control device controls said converter to decrease the output voltage of said converter.
3. The vehicle charging system according to claim 2 , wherein, if the detection value of said current sensor is not zero, said control device controls said converter to increase the output voltage of said converter.
4. The vehicle charging system according to claim 1 , wherein, if an abnormality in said current sensor is detected, said control device controls said converter to set the output voltage of said converter to a predetermined maximum value.
5. The vehicle charging system according to claim 1 , further comprising a DC/DC converter configured to perform voltage conversion on power output from said power storage device and supply the power to said auxiliary load at system start-up that allows the vehicle to travel,
wherein, if operating power for said auxiliary load is not supplied sufficiently by said converter during said external charging, said DC/DC converter further operates.
6. The vehicle charging system according to claim 1 , wherein
said external power supply is an AC power supply, and
said converter is composed of an AC/DC converter.
7. An electrically powered vehicle, comprising:
the charging system according to claim 1 ; and
a vehicle drive system generating travel torque using power stored in the power storage device charged by said charging system.