ELECTRICAL SYSTEM OF ELECTRIC VEHICLE

摘要

PROBLEM TO BE SOLVED: To eliminate a chopper to reduce size, weight and cost of a system apparatus and make an inverter input voltage variable to improve a system efficiency. SOLUTION: One side ends of the windings of an AC motor 103 are connected to the AC output side of a voltage-type inverter 101 which receives a DC voltage and outputs a variable AC voltage with a variable frequency and the other side ends of the windings of the AC motor are connected to each other together to form a neutral. A variable voltage type energy storage device 105 is connected between the neutral and one of the DC input terminals of the inverter 101 and an automotive DC power supply 106 is connected between both the ends of the energy storage device 105. Further, the inverter 101 is made to practise a chopper operation by switching operation of a zero-voltage mode of the inverter 101 and a power is delivered between the variable voltage type energy storage device 105 and the DC input side of the inverter 101 through the inverter 101.