Power source system for electric powered vehicle

摘要

A PLG-ECU for external charging is provided separately from an HV-ECU for vehicle running, and configured to be capable of controlling external charging relays to be turned on/off. A sub DC/DC converter converting the output voltage of a charger into an auxiliary system voltage at the time of external charging is provided separately from a main DC/DC converter of large capacity used at the time of vehicle running. At the time of external charging, PLG-ECU can execute external charging without starting a vehicle running system while sub DC/DC converter can generate an auxiliary system voltage. Since external charging can be executed while system main relays each are kept turned off, a high voltage is not applied to components at the succeeding stage. Consequently, a main battery can be externally charged without exerting any influence on the durability and the life of each component of the vehicle running system.

主权项

1. A power source system for an electric powered vehicle chargeable by an external power source outside of the vehicle, comprising:
a rechargeable main power storage device and a rechargeable sub power storage device; a charger configured to convert electric power supplied from said external power source into electric power for charging said main power storage device at a time of external charging for charging said main power storage device by said external power source; a power control unit configured to control driving of an electric motor for generating vehicle driving power, by electric power conversion between a main power supply line and said electric motor; a first switch connected between said main power storage device and said main power supply line; a second switch connected parallel to said first switch, between said charger and said main power storage device; an auxiliary load configured to operate by supply of electric power for an auxiliary system from a power supply line connected to said sub power storage device; a first voltage converter connected between said main power supply line and said power supply line, and configured to convert an output voltage of said main power storage device into a level of an output voltage of said sub power storage device and output the output voltage to said power supply line; a second voltage converter configured to convert an output voltage of said charger into the level of the output voltage of said sub power storage device and output the output voltage to said power supply line; and a controller for controlling an operation of said electric powered vehicle, said controller including a first control unit operated by electric power supplied from said sub power storage device to control said first switch, said first voltage converter and said power control unit, and a second control unit operated by electric power supplied from said sub power storage device to control said second switch, said second voltage converter and said charger, at the time of said external charging, said first switch being opened while said second switch is closed, and at a time of vehicle running, said first switch being closed while said second switch is opened.