Electric system for electric vehicle
First Claim
1. An electric system for energizing an electric vehicle, said vehicle having a plurality of driven wheels, comprisingan AC motor for driving at least one of said wheels;
- a secondary battery;
terminal means for connecting a source of AC power to the electric system;
power converting means having a DC side coupled to said secondary battery, and an AC side connected to said AC motor and to said terminal means to receive AC power applied thereto, said power converting means converting DC power supplied from said secondary battery to AC power at said AC side to drive said AC motor, said power converting means further rectifying AC power supplied at said terminal means to DC power at the DC side of said power converting means to charge said secondary battery; and
a switch interposed between said AC motor and the AC side of said power converting means, said switch disconnecting said AC motor from said power converting means during charging of said secondary battery.
1 Assignment
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Accused Products
Abstract
An electric system for an electric vehicle enabling a secondary battery to be charged easily without using a large capacity and bulky charging system. The system can maintain integrity of power on a distribution network during charging. When charging the secondary battery, a switch connecting an inverter to an AC motor is opened, and then, the AC voltage from an external distribution network is supplied to the AC side of the inverter. The inverter rectifies the AC voltage to a DC voltage under the control of a control circuit so that the secondary battery is charged by the DC voltage. In another example, the windings of the AC motor may be connected between the distribution network and the inverter by the switching operation of a three-pole contactor so that the windings function as AC reactors.
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Citations
17 Claims
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1. An electric system for energizing an electric vehicle, said vehicle having a plurality of driven wheels, comprising
an AC motor for driving at least one of said wheels; -
a secondary battery; terminal means for connecting a source of AC power to the electric system; power converting means having a DC side coupled to said secondary battery, and an AC side connected to said AC motor and to said terminal means to receive AC power applied thereto, said power converting means converting DC power supplied from said secondary battery to AC power at said AC side to drive said AC motor, said power converting means further rectifying AC power supplied at said terminal means to DC power at the DC side of said power converting means to charge said secondary battery; and a switch interposed between said AC motor and the AC side of said power converting means, said switch disconnecting said AC motor from said power converting means during charging of said secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electric system for energizing an electric vehicle, said vehicle having a plurality of driven wheels, comprising
an AC motor for driving at least one of said wheels, said AC motor having windings therein; -
a secondary battery; terminal means for connecting a source of AC power to the electric system; power converting means having a DC side coupled to said secondary battery and an AC side connected to said AC motor and to said terminal means to receive AC power applied thereto, said power converting means converting the DC power supplied from said secondary battery to AC power at said AC side to drive said AC motor, said power converting means further rectifying AC power supplied at said terminal means to DC power at the DC side of said power converting means to charge said secondary battery; and connection means for interposing the windings of said AC motor between said terminal means and said power converting means during charging of said secondary battery. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification