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.
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