DRIVING SYSTEM FOR HYBRID ELECTRIC VEHICLES AND METHOD OF CONTROLLING PHASE OF PULSE WIDTH MODULATION CARRIER SIGNAL IN THE SAME

摘要

Provided is a driving system for hybrid electric vehicles. The driving system includes a DC/DC converter configured to convert low-voltage DC power of a vehicle battery into high-voltage DC power according to a first PWM signal generated based on a first PWM carrier signal, a first inverter configured to convert the high-voltage DC power into first AC power according to a second PWM signal generated based on a second PWM carrier signal, and drive a first driving motor, which operates in one mode of a motoring mode for driving a vehicle and a regenerative mode for collecting kinetic energy of the vehicle as electric energy, according to the first AC power, a second inverter configured to convert the high-voltage DC power into second AC power according to a third PWM signal generated based on a third PWM carrier signal, and drive a second driving motor, which operates in one mode of the motoring mode and the regenerative mode, according to the second AC power, and a PWM phase controller configured to separately control phases of the first to third PWM carrier signals according to an operation mode of each of the first and second driving motors.

主权项

1. A driving system for hybrid electric vehicles, the driving system comprising:
a DC/DC converter configured to convert low-voltage direct current (DC) power of a vehicle battery into high-voltage DC power according to a first pulse width modulation (PWM) signal generated based on a first PWM carrier signal; a first inverter configured to convert the high-voltage DC power into first alternating current (AC) power according to a second PWM signal generated based on a second PWM carrier signal, and drive a first driving motor, which operates in one mode of a motoring mode for driving a vehicle and a regenerative mode for collecting kinetic energy of the vehicle as electric energy, according to the first AC power; a second inverter configured to convert the high-voltage DC power into second AC power according to a third PWM signal generated based on a third PWM carrier signal, and drive a second driving motor, which operates in one mode of the motoring mode and the regenerative mode, according to the second AC power; and a PWM phase controller configured to separately control phases of the first to third PWM carrier signals according to an operation mode of each of the first and second driving motors.