POWER SUPPLY SYSTEM FOR ELECTRIC POWERED VEHICLE, CONTROL METHOD THEREOF, AND ELECTRIC POWERED VEHICLE
First Claim
1. A power supply system for an electric powered vehicle, comprising:
- a main power storage device for storing electric power input/output with respect to an electric motor generating vehicle driving power,a charger configured including a smoothing capacitor, for converting electric power from an external power supply into charging power for said main power storage device,a sub-power storage device having an output voltage lower than the output voltage of said main power storage device,a power converter provided between said charger and said sub-power storage device, configured to convert the power on a first power line connected to said smoothing capacitor into charging power for said sub-power storage device, anda control device for controlling an operation of said power converter based on a voltage on said first power line,said control device, in an external charging mode by said charger, causing said power converter to operate to charge said sub-power storage device when the voltage on said first power line is higher than a first determination voltage, and stopping said power converter when the voltage on said first power line is lower than said first determination voltage, and in a discharging mode of said smoothing capacitor at an end of said external charging, causing said power converter to operate to convert stored charge in said smoothing capacitor into charging power for said sub-power storage device even when the voltage on said first power line becomes lower than said first determination voltage.
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Accused Products
Abstract
A charger converting electric power from an external power supply into charging power for a power storage device converts AC power on a power line into charging power for an auxiliary battery. A CHR connects or disconnects a path between the charger and the power storage device. A DC/DC converter converts DC power on a power line connected to a smoothing capacitor into charging power for the auxiliary battery and outputs the power onto a power line. An ECU discharges the smoothing capacitor even if the voltage on the power line is lower than a determination voltage by causing the DC/DC converter to operate to charge the auxiliary battery in a discharging mode where the CHR is set OFF.
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Citations
15 Claims
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1. A power supply system for an electric powered vehicle, comprising:
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a main power storage device for storing electric power input/output with respect to an electric motor generating vehicle driving power, a charger configured including a smoothing capacitor, for converting electric power from an external power supply into charging power for said main power storage device, a sub-power storage device having an output voltage lower than the output voltage of said main power storage device, a power converter provided between said charger and said sub-power storage device, configured to convert the power on a first power line connected to said smoothing capacitor into charging power for said sub-power storage device, and a control device for controlling an operation of said power converter based on a voltage on said first power line, said control device, in an external charging mode by said charger, causing said power converter to operate to charge said sub-power storage device when the voltage on said first power line is higher than a first determination voltage, and stopping said power converter when the voltage on said first power line is lower than said first determination voltage, and in a discharging mode of said smoothing capacitor at an end of said external charging, causing said power converter to operate to convert stored charge in said smoothing capacitor into charging power for said sub-power storage device even when the voltage on said first power line becomes lower than said first determination voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling a power supply system for an electric power vehicle incorporating an electric motor that generates vehicle driving power,
said power supply system including a main power storage device for storing electric power input/output with respect to said electric motor, a charger configured including a smoothing capacitor, for converting electric power from an external power supply into charging power for said main power storage device, a sub-power storage device having an output voltage lower than the output voltage of said main power storage device, and a power converter provided between said charger and said sub-power storage device, configured to convert the power on a first power line connected to said smoothing capacitor into charging power for said sub-power storage device, said method of controlling comprising the steps of: -
comparing a voltage on said first power line with a first determination voltage when operation of said power converter is instructed, causing said power converter to operate to charge said sub-power storage device when the voltage on said first power line is higher than the first determination voltage, causing said power converter to operate to convert stored charge in said smoothing capacitor into charging power for said sub-power storage device in a discharging mode of said smoothing capacitor at an end of external charging, when the voltage on said first power line is lower than said first determination voltage, and stopping said power converter in a mode other than said discharging mode when the voltage on said first power line is lower than said first determination voltage. - View Dependent Claims (8, 9, 10)
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11. An electric powered vehicle allowing charging by an external power supply, said electric powered vehicle comprising:
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an electric motor generating vehicle driving power, a main power storage device for storing electric power input/output with respect to said electric motor, a charger configured including a smoothing capacitor, for converting electric power from said external power supply into charging power for said main power storage device, a sub-power storage device having an output voltage lower than the output voltage of said main power storage device, a power converter provided between said charger and said sub-power storage device, configured to convert the power on a first power line connected to said smoothing capacitor into charging power for said sub-power storage device, and a control device for controlling an operation of said power converter based on a voltage on said first power line, said control device, in an external charging mode by said charger, causing said power converter to operate to charge said sub-power storage device when the voltage on said first power line is higher than a first determination voltage, and stopping said power converter when the voltage on said first power line is lower than said first determination voltage, and in a discharging mode of said smoothing capacitor at an end of said external charging, causing said power converter to operate to convert stored charge in said smoothing capacitor into charging power for said sub-power storage device even when the voltage on said first power line becomes lower than said first determination voltage. - View Dependent Claims (12, 13, 14, 15)
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Specification