Energy Storage for PFC by EV Motor/Generator

The size of dc-bus capacitor is the key contributor for the volumes of PFC and battery charger, whose important characteristics is the 2nd order low-frequency ripple power on the dc bus. The motor in an electric vehicle can be used to store the ripple power, thus significantly reducing the size of the dc-bus capacitor. Thanks to EV's already available power electronics system, control of the motor/generator inductor current is feasible without employing an extra converter. A digital controller is used to regulate the converter by using PWM, resulting in small volume, low noise and high power density. The size of the dc-bus capacitor is reduced 10 times.
Patent Information:
For Information, Contact:
Li Chen
Licensing Associate
Virginia Tech Intellectual Properties, Inc.
(540) 443-9217
Khai Ngo
Hui Wang