Patent ID: 6459167
Filing Date: 2002-10-01
Classification: B60L,H02H,Y02T

Abstract:
A system for controlling electromotive force of a motor of an electric vehicle, the system comprising:a motor controller connected to a power supply through a power supply line, and connected to a driving motor which is a load of the power supply, wherein electric power is supplied to the driving motor from the power supply through the motor controller, the motor controller having a capacitor; a main relay inserted in the power supply line disposed between the power supply and the motor controller; and a precharge device connected to the power supply line and connected to the main relay in parallel, the precharge device being operable to charge the capacitor of the motor controller in an initial stage of supply of the electric power, wherein the precharge device is de-energized after charging the capacitor to a predetermined capacity, and the main relay is energized so that a power current is supplied to the driving motor, and wherein further the precharge device has an intelligent-power switch unit comprised of an electric-power-supply control unit including a main MOSFET semiconductor switching device capable of limiting an electric current flowing through the precharge device to an arbitrary value.