Patent ID: 7791292
Filing Date: 2010-09-07
Classification: B60L,Y02T

Abstract:
1. A vehicle comprising: an electric drive adapted to receive operating power from an external electric supply system, a battery located on-board the vehicle, the battery having a rated voltage which is less than or equal to 10% of voltage of the external electric supply system; and a control unit for actuating the electric drive; wherein the electric drive is configured and operative to operate with the voltage of the external electric supply system and can be supplied by and is configured to be operated by the battery when the external electric supply system is disconnected or fails, the battery being configured and operative for supplying an on-board electrical supply system of the vehicle for functions other than traction in a normal operating mode of the electric drive, during which the drive is being supplied by an external electric supply system, the electric drive comprises a power unit, and an electric motor connected to the power unit, and the power unit comprises a switched rectifier power inverter controlled by a PWM driver, and the control unit being configured and operative to compensate voltage drops delivered to the motor when the electric drive is operated by the battery by adjusting the PWM duty cycle to increase the current output of the switched rectifier power inverter.