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An electric vehicle whose wheels are powered by a d.c. power supply includes a combination of a rechargeable high-energy battery and a rechargeable high-power battery or to a hybrid electric vehicle whose wheels are powered by the d.c. power supply and an internal combustion engine. The d.c. power s

An electric vehicle whose wheels are powered by a d.c. power supply includes a combination of a rechargeable high-energy battery and a rechargeable high-power battery or to a hybrid electric vehicle whose wheels are powered by the d.c. power supply and an internal combustion engine. The d.c. power supply is formed by connecting a d.c. circuit which comprises a rechargeable high-power battery and a current-stiff two-quadrant chopper in parallel with the rechargeable high-power battery. When an current of the rechargeable high-power battery is increased to a value which is greater than a specified value, the chopper is activated to charge or discharge the rechargeable high-power battery, thereby reducing an current of the rechargeable high-power battery to a value which is smaller than the specified value.

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[ What is claimed is:] [1.] A power supply system for use in an electric vehicle whose wheels are powered by a d.c. power supply comprising a combination of a high-energy rechargeable battery and a rechargeable high-power battery, the system comprising:a d.c. power supply circuit which is formed fro

[ What is claimed is:] [1.] A power supply system for use in an electric vehicle whose wheels are powered by a d.c. power supply comprising a combination of a high-energy rechargeable battery and a rechargeable high-power battery, the system comprising:a d.c. power supply circuit which is formed from a series-circuit comprised of the rechargeable high-power battery and a two-quadrant electric chopper which is connected in parallel with the rechargeable high-energy battery used as the main battery to constitute a d.c. power supply, whereinwhen the current of the high-energy rechargeable battery is increased to a value greater than a specified value, the chopper is actuated to charge or discharge the rechargeable high-power battery in such a way that the current of the high-energy rechargeable battery decreases to the specified value or less.