Charging device and charging method for power storage device

摘要

A charger includes a conversion unit for converting external electric power from a charging port into DC, a conversion unit for converting the output of the preceding conversion unit into high-frequency AC, and a conversion unit for converting the electric power generated by transforming the output of the preceding conversion unit by an insulated transformer into DC to output the DC to a power storage device. The charger further includes a switch unit that enables the circuit configuration of the charger to switch between a single-stage charging circuit and a dual-stage charging circuit. The switch unit is controlled by a control signal from an ECU. The ECU controls the switch unit in accordance with the SOC of the power storage device and switches the circuit configuration of the charger to one of the single-stage charging circuit and the dual-stage charging circuit.

主权项

1. A charging device for a power storage device mounted on a vehicle, comprising:
a power receiving unit receiving electric power supplied from a power supply which is external to the vehicle; and a charger converting electric power which is input from said power receiving unit and outputting the converted electric power to said power storage device, said charger comprising: a first conversion unit including a first switching circuit having a plurality of switching elements; a second conversion unit connected to said first conversion unit and including a second switching circuit; and a switch unit for switching a circuit configuration of said charger to one of a first charging circuit for performing first charging by operating said second switching circuit without operating said first switching circuit, and a second charging circuit for performing second charging by operating both said first switching circuit and said second switching circuit, said charging device further comprises a control device controlling said charger, and said control device switches the circuit configuration of said charger to one of said first charging circuit and said second charging circuit, based on an amount of charge stored in said power storage device, wherein switching of the switching elements in the first switching circuit is stopped when the first charging is performed, and the switching elements in the first switching circuit are in a switching mode when the second charging is performed, said charger includes a positive line and a negative line for supplying electric power converted by said first conversion unit to said second conversion unit, said switch unit includes:
a capacitor switch unit switched to a state of connecting a capacitor between said positive line and said negative line when said second charging circuit is formed, and switched to a state of disconnecting said capacitor between said positive line and said negative line when said first charging circuit is formed;a first reactor switch unit switched to a state of connecting a first reactor circuit between said power receiving unit and said first conversion unit when said second charging circuit is formed, and switched to a state of disconnecting said first reactor circuit between said power receiving unit and said first conversion unit when said first charging circuit is formed; anda second reactor switch unit switched to a state of connecting a second reactor circuit between said first conversion unit and said second conversion unit when said first charging circuit is formed, and switched to a state of disconnecting said second reactor circuit between said first conversion unit and said second conversion unit when said second charging circuit is formed.