ELECTRIC VEHICLE CONTROLLER

摘要

An electric vehicle controller for driving an induction motor in which detection accuracy of DC voltage is enhanced. The electric vehicle controller comprises a DC power supply having a maximum potential terminal A, an intermediate potential terminal B and a minimum potential terminal C, an upper capacitor (6) between the maximum potential terminal A and the intermediate potential terminal B, and a lower capacitor (7) between the intermediate potential terminal B and the minimum potential terminal C. An overvoltage suppressing means having a resistor (8) and a thyristor (9) between the maximum potential terminal A and the minimum potential terminal C is also provided. Furthermore, a lower voltage sensor (10) between the intermediate potential terminal B and the minimum potential terminal C, an upper voltage sensor (11) between the joint of the resistor (8) and the thyristor (9) and the intermediate potential terminal B, and a three-level inverter (3) connected with the maximum potential terminal A, the intermediate potential terminal B and the minimum potential terminal C and supplying AC power to the induction motor are provided, wherein the three-level inverter (3) is controlled using the detection voltages of the lower voltage sensor (10) and the upper voltage sensor (11).